JP2021006332A - Alkaline solid reactant processing system - Google Patents

Abstract

To provide an alkaline solid reactant processing system capable of efficiently processing an alkaline solid reactant.SOLUTION: An alkaline solid reactant processing system is assembled with a conduit tube through which an exhaust gas passes, a processor for carbonation reaction of an alkaline solid reactant and an exhaust gas, and a heat exchanger provided between the conduit tube and the processor for cooling the exhaust gas withdrawn from the conduit tube and sending it to the processor.SELECTED DRAWING: Figure 1

Description

The present invention relates to an alkaline solid reactant treatment system.

There is known a technique for carbonizing an alkaline solid reactant such as incineration ash generated when waste such as industrial waste is incinerated in order to effectively utilize it as a resource. For example, Patent Document 1 discloses an incineration ash treatment method in which heavy metals contained in incineration ash are carbonized by blowing combustion exhaust gas obtained by burning digestion gas produced by methane fermentation into incineration ash. ..

Japanese Unexamined Patent Publication No. 2016-182561

However, since the carbonation reaction is an exothermic reaction, if the amount of heat contained in the exhaust gas is high, the efficiency of the carbonation reaction of the alkaline solid reaction product may decrease.

The present disclosure has been made in view of the above, and an object of the present invention is to provide an alkaline solid reaction product treatment system capable of efficiently treating an alkaline solid reaction product.

In order to solve the above-mentioned problems and achieve the object, one aspect of the present disclosure includes a conduit through which exhaust gas passes, a treatment device for carbonizing an alkaline solid reactant and exhaust gas, and a conduit and a treatment device. It is an alkaline solid reactant treatment system provided between the heat exchangers that cool the exhaust gas drawn from the conduit and send it to the treatment equipment.

In the embodiment of the alkaline solid reaction product treatment system described above, it is preferable that the heat exchanger receives the exhaust gas that has undergone the carbonation reaction in the treatment apparatus as the return gas and cools the exhaust gas with the return gas.

In the embodiment of the alkaline solid reaction treatment system described above, it is preferable that the conduit receives the return gas obtained by cooling the exhaust gas in the heat exchanger.

In the embodiment of the alkaline solid reaction product treatment system described above, it is preferable to provide a water supply device for sending condensed water generated by cooling the exhaust gas in the heat exchanger to the return gas flow path.

In the embodiment of the alkaline solid reaction product treatment system described above, a water supply device that sends condensed water generated by cooling exhaust gas in a heat exchanger to the treatment device, and the condensed water as cleaning water for cleaning the alkaline solid reaction product. It is preferable to provide a cleaning device for spraying.

In the embodiment of the alkaline solid reaction product treatment system described above, it is preferable to provide a water storage tank for storing cooling water and a water supply device for circulating the cooling water between the heat exchanger and the water storage tank.

In the embodiment of the alkaline solid reaction product treatment system described above, it is preferable that the water storage tank receives the leachate, which is the cooling water heated by the exhaust gas in the heat exchanger, as the cooling water again.

In the aspect of the alkaline solid reaction product treatment system described above, it is preferable that the water storage tank receives the condensed water generated by cooling the exhaust gas in the heat exchanger as cooling water.

In the embodiment of the alkaline solid reaction product treatment system described above, the heat exchanger includes a first heat exchanger and a second heat exchanger, and the first heat exchanger passes the exhaust gas drawn from the conduit. It is preferable that the second heat exchanger is provided with a cooling passage for cooling the cooling passage and an inundation chamber in which the circulating water for cooling the cooling passage is flooded, and the second heat exchanger cools the circulating water with the cooling water.

In the embodiment of the alkaline solid reaction product treatment system described above, the heat exchanger includes a first heat exchanger, a second heat exchanger, and a third heat exchanger, and the first heat exchanger is The second heat exchanger is provided with a cooling chamber through which the exhaust gas drawn from the conduit passes and a sprinkler device for spraying the condensed water generated by cooling the exhaust gas into the cooling chamber. The second heat exchanger has a cooling passage through which the condensed water passes and cooling. It is preferable that the third heat exchanger is provided with an inundation chamber in which the circulating water for cooling the passage is flooded, and the circulating water is cooled by the cooling water.

In the embodiment of the alkaline solid reaction product treatment system described above, it is preferable that the water storage tank receives the leached water leached from the alkaline solid reaction product as cooling water.

In the embodiment of the alkaline solid reaction product treatment system described above, the heat exchanger circulates circulating water between the first heat exchanger, the second heat exchanger, the first heat exchanger and the second heat exchanger. The first heat exchanger includes a cooling chamber for cooling the exhaust gas drawn from the conduit with circulating water, and a sprinkler for spraying the circulating water to the cooling chamber, and includes a second heat exchanger. It is preferable to cool the circulating water with a cooling medium.

In the embodiment of the alkaline solid reaction product treatment system described above, the heat exchangers are the first heat exchanger, the second heat exchanger, the third heat exchanger, the first heat exchanger and the second heat exchange. The first heat exchanger includes a first water supply device that circulates the first circulating water in the vessel and a second water supply device that circulates the second circulating water in the second heat exchanger and the third heat exchanger. Is provided with a cooling chamber for cooling the exhaust gas drawn from the conduit by the first circulating water and a sprinkler for spraying the first circulating water to the cooling chamber, and the second heat exchanger is passed through the first circulating water. It is preferable that the third heat exchanger is provided with a cooling passage and an immersion chamber in which the second circulating water for cooling the cooling passage is flooded, and the second circulating water is cooled by a cooling medium.

In the embodiment of the alkaline solid reaction product treatment system described above, the cooling medium is preferably a liquid.

In the embodiment of the alkaline solid reaction product treatment system described above, the cooling medium is preferably a gas.

In the embodiment of the alkaline solid reaction product treatment system described above, it is preferable that the conduit receives the exhaust gas that has undergone the carbonation reaction in the treatment apparatus as a return gas.

In addition, in the aspect of the above-mentioned alkaline solid reaction product treatment system, it is preferable that the treatment device includes a cleaning device for spraying cleaning water for washing the alkaline solid reaction product.

In the embodiment of the alkaline solid reactant treatment system described above, the treatment apparatus is provided in a container body having a bottom, a first chamber provided on the bottom inside the container body and drawing exhaust gas, and inside the container body. The second chamber, which is provided above the first chamber and reacts the contained alkaline solid reactant with the exhaust gas by carbonation reaction, and the inside of the container body, which are provided at intervals with respect to the bottom, and are breathable and passable. It is preferable to provide a partition wall which is water-based and separates the first chamber and the second chamber.

In addition, in the aspect of the above-mentioned alkaline solid reaction product treatment system, it is preferable that the partition wall contains a plurality of laminated plate materials.

According to the present disclosure, it is possible to efficiently treat an alkaline solid reaction product.

FIG. 1 is a schematic view showing an alkaline solid reaction product treatment system according to the first embodiment. FIG. 2 is a schematic plan view showing the processing apparatus according to the first embodiment. FIG. 3 is a schematic view showing an alkaline solid reaction product treatment system according to the second embodiment. FIG. 4 is a schematic view showing an alkaline solid reaction product treatment system according to a modified example of the second embodiment. FIG. 5 is a schematic view showing an alkaline solid reaction product treatment system according to the third embodiment. FIG. 6 is a schematic view showing an alkaline solid reactant treatment system according to a modified example of the third embodiment. FIG. 7 is a schematic view showing an alkaline solid reaction product treatment system according to the fourth embodiment.

Hereinafter, embodiments of the alkaline solid reaction product treatment system according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the description of the following embodiments. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same. In addition, the components described below may be modified in various ways without departing from the spirit of the invention. Furthermore, the components described below can be combined as appropriate. In the following description of the embodiment, the same configuration will be designated by the same reference numerals, and different configurations will be designated by different reference numerals.

The alkaline solid reaction product contains cement solidified products, incineration residues and the like. The incineration residue is a residue generated in the process of incineration of waste. The incineration residue includes incineration ash collected from the bottom of the incinerator, main incineration ash such as cinders, and flying ash such as dust collecting ash and soot and dust floating in the incineration waste gas. The incineration residue contains heavy metals such as calcium (Ca) and lead (Pb). The incineration residue contains salts such as chlorine (Cl) and organic substances. Since the incineration residue contains harmful substances such as heavy metals, it is necessary to stabilize it before reusing or final disposal. The alkaline solid-reactant treatment system of the present invention stabilizes the alkaline solid-reactant by a carbonation reaction. In each of the following embodiments, the alkaline solid reactant treatment systems 1, 2, 2A, 3, 3A, and 4 stabilize the incineration main ash A by a carbonation reaction. The alkaline solid reaction product treatment systems 1, 2, 2A, 3, 3A, and 4 are systems that circulate the high-temperature exhaust gas G1 discharged from the incinerator. The alkaline solid reactant treatment systems 1, 2, 2A, 3, 3A, and 4 are effective in exhaust gas G1 by lowering the temperature of the high-temperature exhaust gas G1 in the process of circulation and using it for carbonation treatment of the alkaline solid reactant. It is intended for use.

(First Embodiment)
[System configuration]
First, the alkaline solid reaction product treatment system 1 of the first embodiment will be described. FIG. 1 is a schematic view showing an alkaline solid reaction product treatment system according to the first embodiment. FIG. 2 is a schematic plan view showing the processing apparatus according to the first embodiment. The alkaline solid reaction product treatment system 1 includes a chimney 10, a treatment device 20, a water storage tank T1, a heat exchanger 30, and a water storage tank T2.

The chimney 10 and the treatment device 20 are connected via an exhaust gas supply line Lg1 and a return gas supply line Lg2. The exhaust gas supply line Lg1 supplies the exhaust gas G1 drawn from the chimney 10 to the processing device 20. The exhaust gas supply line Lg1 passes through the heat exchanger 30. The exhaust gas supply line Lg1 includes a first exhaust gas supply line Lg11 and a second exhaust gas supply line Lg12. The first exhaust gas supply line Lg 11 connects the chimney 10 and the heat exchanger 30. The second exhaust gas supply line Lg 12 connects the heat exchanger 30 and the processing device 20. The exhaust gas supply line Lg1 is provided with a cleaning dust collector S (alkaline scrubber) for removing the acidic component of the exhaust gas G1 and a blower B (blower) for drawing the exhaust gas G1 from the negative pressure chimney 10. The cleaning dust collector S and the blower B are provided in the second exhaust gas supply line Lg12 in the first embodiment.

The return gas supply line Lg2 supplies the return gas G2 drawn from the processing device 20 to the chimney 10. The return gas supply line Lg2 passes through the heat exchanger 30 in the first embodiment. In the first embodiment, the return gas supply line Lg2 includes a first return gas supply line Lg21 and a second return gas supply line Lg22. The first return gas supply line Lg 21 connects the processing device 20 and the heat exchanger 30. In the first embodiment, the first return gas supply line Lg 21 is provided with an intake port 16 for taking in the outside air G0 and a blower B (blower) for drawing in the return gas G2 from the processing device 20. The second return gas supply line Lg22 connects the heat exchanger 30 and the chimney 10. The blower B may or may not be provided on the second return gas supply line Lg22, or may not be provided on the return gas supply line Lg2.

The treatment device 20 draws the washing water Wr through the washing water supply line Lwr. The wash water supply line Lwr is connected to the fresh water supply line Lw0. The wash water supply line Lwr draws fresh water W0 from the fresh water supply line Lw0. The fresh water W0 is, for example, groundwater or tap water. The wash water supply line Lwr may, for example, draw in fresh water W0 from a tap water faucet, or may store fresh water W0 in a water tank and draw it in by a water supply device. In the first embodiment, the wash water supply line Lwr is connected to the first condensed water supply line Lw221 described later. The washing water supply line Lwr draws the condensed water W2 described later from the first condensed water supply line Lw221. In the first embodiment, the wash water supply line Lwr is switchably connected to the fresh water supply line Lw0 and the first condensed water supply line Lw221. Switching between the fresh water supply line Lw0 and the first condensed water supply line Lw221 is performed by, for example, a pump or a solenoid valve. In the state where the washing water supply line Lwr is connected to the fresh water supply line Lw0, the washing water supply line Lwr draws the fresh water W0 as the washing water Wr. In the state where the washing water supply line Lwr is connected to the first condensed water supply line Lw221, the washing water supply line Lwr draws the condensed water W2 as the washing water Wr.

The treatment device 20 and the water storage tank T1 are connected via the leaching water discharge line Lw10. The leachate discharge line Lw10 supplies the leachate W1 discharged from the treatment device 20 to the water storage tank T1. The leaching water discharge line Lw10 is provided with a valve V and a water supply device P for drawing in the leaching water W1 from the treatment device 20. When the valve V is closed or the leachate discharge line Lw10 is water-sealed in the leachate W1, the airtightness of the treatment device 20 is improved.

The heat exchanger 30 and the water storage tank T2 are connected via a condensed water discharge line Lw20. The condensed water discharge line Lw20 supplies the condensed water W2 discharged from the heat exchanger 30 to the water storage tank T2. The water storage tank T2 communicates with the condensed water supply line Lw22. The condensed water supply line Lw22 is provided with a water supply device P for drawing the condensed water W2 from the water storage tank T2. The condensed water supply line Lw22 includes a first condensed water supply line Lw221 and a second condensed water supply line Lw222. The condensed water supply line Lw22 branches into a first condensed water supply line Lw221 and a second condensed water supply line Lw222 downstream. The first condensed water supply line Lw221 is connected to the washing water supply line Lwr. The second condensed water supply line Lw222 is connected to the second return gas supply line Lg22 via the spray device 18. The spray device 18 communicates with the second condensed water supply line Lw222. The spray device 18 receives the condensed water W2 from the second condensed water supply line Lw222. The spraying device 18 atomizes the condensed water W2. The spray device 18 communicates with the second return gas supply line Lg22. The spraying device 18 sprays the atomized condensed water W2 onto the second return gas supply line Lg22. The condensed water W2 sprayed on the second return gas supply line Lg22 is mixed with the return gas G2.

The chimney 10 is a tubular structure. The chimney 10 releases the exhaust gas G1 discharged in the process of combustion into the atmosphere. The chimney 10 is provided in a combustion facility such as a factory or a power plant, for example. Exhaust gas G1 contains carbon dioxide (CO ₂ ). The exhaust gas G1 emitted from the chimney 10 is harmless so that acidic components such as nitrogen oxides (NO _X ), sulfur oxides (SO _X ) and hydrogen chloride (HCl) are below the standard values of the Air Pollution Control Act. Has been processed. The exhaust gas G1 emitted from the chimney 10 has a high temperature of 100 to 200 ° C. The exhaust gas G1 emitted from the chimney 10 contains water.

The chimney 10 includes an opening 12i and an opening 12o on the side. A connection duct 14i is connected to the opening 12i. The connection duct 14i communicates with the first exhaust gas supply line Lg11. The exhaust gas G1 is sent to the first exhaust gas supply line Lg11 via the connection duct 14i. A connection duct 14o is connected to the opening 12o. The connection duct 14o communicates with the second return gas supply line Lg22. The chimney 10 receives the return gas G2 from the second return gas supply line Lg22 via the connection duct 14o. The return gas G2 is the exhaust gas G1 after reacting with the incineration main ash A in the treatment apparatus 20. The connecting duct 14i may have a double pipe structure. In this case, the exhaust gas G1 is sent from the chimney 10 to the first exhaust gas supply line Lg11 via the connection duct 14i, and the return gas G2 is sent from the second return gas supply line Lg22 to the chimney 10 via the connection duct 14i. Be done.

The processing device 20 is an air-solid reaction device in the first embodiment. The container body 21 of the processing device 20 has a sealed structure sealed by a side wall portion, a lid portion, and a bottom portion. The wall portion of the container body 21 is made of a metal such as an iron plate, steel or stainless steel. The processing device 20 includes a first chamber 22, a second chamber 24, a partition wall 26, and a cleaning device 28. The first chamber 22 receives the exhaust gas G1 from the second exhaust gas supply line Lg12 via the inlet port 22i. The first chamber 22 stores the exhaust gas G1. The first chamber 22 is provided below the second chamber 24 across the partition wall 26. The second room 24 stores the incineration main ash A. The second chamber 24 is provided above the first chamber 22 with a partition wall 26 in between. The second chamber 24 can be ventilated from the first chamber 22. The second chamber 24 receives the exhaust gas G1 from the first chamber 22 via the partition wall 26 at the lower portion.

The treatment apparatus 20 causes the incineration main ash A and the exhaust gas G1 to undergo a carbonation reaction in the second chamber 24. By carbonating the incineration main ash A, heavy metals such as calcium and lead contained in the incineration main ash A are hardly soluble. The exhaust gas G1 that has reacted with the incineration main ash A is stored as the return gas G2 in the gas phase portion above the second chamber 24. The return gas G2 is sent to the first return gas supply line Lg21 via the outlet port 24o.

The partition wall 26 is a plate material that separates the first chamber 22 and the second chamber 24. The partition wall 26 is provided at a distance from the bottom of the container body 21. The incinerator main ash A is placed on the partition wall 26. The partition wall 26 has air permeability and water permeability. As shown in FIG. 2, the partition wall 26 includes a plurality of holes 26h. The exhaust gas G1 can ventilate the first chamber 22 and the second chamber 24 through the hole 26h. The plurality of holes 26h are arranged at predetermined intervals along the side wall portion of the container body 21. The partition wall 26 is formed, for example, by punching out a plurality of holes 26h in a metal plate. The number and position of the holes 26h are not particularly limited as long as the partition wall 26 has air permeability and water permeability. The partition wall 26 may have, for example, a mesh structure. The partition wall 26 may be a single plate material or a plurality of laminated plate materials.

The cleaning device 28 cleans the incinerator main ash A in the second chamber 24. The cleaning device 28 is provided above the processing device 20. The cleaning device 28 includes a nozzle for spraying the cleaning water Wr onto the incinerator main ash A in the second chamber 24. The washing water Wr cleans the incinerator main ash A. The cleaning device 28 washes out the salts and organic substances contained in the incineration main ash A by spraying the incineration main ash A with the cleaning water Wr. As described above, the washing water Wr is fresh water W0 or condensed water W2. The cleaning device 28 first cleans the incinerator main ash A with condensed water W2, and then cleans the incinerator main ash A with fresh water W0.

Since the partition wall 26 has water permeability, the wash water Wr that has washed the incineration main ash A is stored as leachate W1 in the lower part of the first chamber 22 of the treatment apparatus 20. The leachate W1 is alkaline containing salts such as sodium (Na), potassium (K), calcium and chlorine, and heavy metals. The first chamber 22 further communicates with the leachate discharge line Lw10 via the discharge port 22e. The leaching water W1 stored in the lower part of the first chamber 22 is discharged to the leaching water discharge line Lw10.

The water storage tank T1 communicates with the leaching water discharge line Lw10. The water storage tank T1 receives the leaching water W1 from the leaching water discharge line Lw10. The water storage tank T1 stores the leachate W1. The leachate W1 stored in the water storage tank T1 is treated as wastewater. The water storage tank T1 is connected to a wastewater treatment facility that treats leachate W1 as wastewater, for example, via a water supply device. The leachate W1 is sent to the treatment tank of the wastewater treatment facility by, for example, a water supply device.

The heat exchanger 30 is provided between the chimney 10 and the processing device 20. The heat exchanger 30 cools the exhaust gas G1 drawn from the chimney 10. The heat exchanger 30 receives the exhaust gas G1 that has undergone a carbonation reaction in the processing device 20 as the return gas G2. The heat exchanger 30 exchanges heat between the amount of sensible heat and latent heat possessed by the exhaust gas G1 and the amount of sensible heat and latent heat possessed by the return gas G2. The exhaust gas G1 is cooled by the return gas G2 in the heat exchanger 30. The return gas G2 is heated by the exhaust gas G1 in the heat exchanger 30. When the air volume of the return gas G2 is insufficient, the heat exchanger 30 may take in the outside air G0 via the intake port 16 and the first return gas supply line Lg21. In the first embodiment, the heat exchanger 30 includes a cooling chamber 32 and a heating passage 34.

The cooling chamber 32 communicates with the first exhaust gas supply line Lg 11 via the inlet port 32i. The cooling chamber 32 receives the exhaust gas G1 from the first exhaust gas supply line Lg11. The exhaust gas G1 passes through the cooling chamber 32 from the inlet port 32i toward the outlet port 32o. The exhaust gas G1 is cooled in the cooling chamber 32. The cooling chamber 32 communicates with the second exhaust gas supply line Lg12 via the outlet port 32o. The cooling chamber 32 sends the cooled exhaust gas G1 to the second exhaust gas supply line Lg12.

The heating passage 34 is provided so as to pass through the inside of the cooling chamber 32. The heating passage 34 communicates with the first return gas supply line Lg21 via the inlet port 34i. The heating passage 34 receives the return gas G2 from the first return gas supply line Lg21. The return gas G2 passes through the heating passage 34 from the inlet port 34i toward the outlet port 34o. The return gas G2 passing through the heating passage 34 cools the exhaust gas G1 in the cooling chamber 32. As a result, the return gas G2 is heated. The heating passage 34 communicates with the second return gas supply line Lg22 via the outlet port 34o. The heating passage 34 sends the heated return gas G2 to the second return gas supply line Lg22.

The heat exchanger 30 exchanges the apparent heat between the high temperature exhaust gas G1 and the low temperature return gas G2. As a result, the temperature and pressure of the exhaust gas G1 decrease. Since the exhaust gas G1 drawn from the chimney 10 has a high temperature and contains water, the temperature is lowered and the saturated water vapor pressure is reduced, so that acidic condensed water W2 having a temperature of 40 ° C. or higher and a pH of 5 or lower is generated. The exhaust gas G1 cooled by the heat exchanger 30 generates condensed water W2. The heat exchanger 30 exchanges the latent heat between the exhaust gas G1 and the return gas G2 due to the latent heat generated when the condensed water W2 is generated from the exhaust gas G1. The condensed water W2 is stored in the lower part of the cooling chamber 32. The cooling chamber 32 further communicates with the condensed water discharge line Lw20 via the discharge port 32e. The condensed water W2 stored in the lower part of the cooling chamber 32 is discharged to the condensed water discharge line Lw20.

The water storage tank T2 communicates with the condensed water discharge line Lw20. The water storage tank T2 receives the condensed water W2 from the condensed water discharge line Lw20. The water storage tank T2 stores the condensed water W2. The water storage tank T2 communicates with the condensed water supply line Lw22. The condensed water W2 stored in the water storage tank T2 is drawn into the condensed water supply line Lw22 by the water supply device P provided in the condensed water supply line Lw22.

As described above, the condensed water supply line Lw22 branches into the first condensed water supply line Lw221 and the second condensed water supply line Lw222 downstream. A part of the condensed water W2 is sent to the washing water supply line Lwr via the first condensed water supply line Lw221. A part of the condensed water W2 is sent to the spraying device 18 via the second condensed water supply line Lw222.

[Gas distribution]
Next, the distribution of the exhaust gas G1 and the return gas G2 in the alkaline solid reaction product treatment system 1 will be described. A part of the exhaust gas G1 in the chimney 10 is sent to the first exhaust gas supply line Lg11 via the opening 12i and the connection duct 14i. The exhaust gas G1 passing through the first exhaust gas supply line Lg 11 has a high temperature of 100 ° C. or higher.

The high-temperature exhaust gas G1 is sent from the first exhaust gas supply line Lg 11 to the cooling chamber 32 of the heat exchanger 30 via the inlet port 32i. The exhaust gas G1 is cooled in the cooling chamber 32 by exchanging heat with the return gas G2 passing through the heating passage 34. The cooled exhaust gas G1 is sent to the second exhaust gas supply line Lg12 via the outlet port 32o. The exhaust gas G1 passing through the second exhaust gas supply line Lg12 has a low temperature of 60 ° C. or lower.

The low-temperature exhaust gas G1 is sent from the second exhaust gas supply line Lg12 to the first chamber 22 of the processing apparatus 20 via the inlet port 22i. The exhaust gas G1 is sent to the second chamber 24 through the partition wall 26, and undergoes a carbonation reaction with the incineration main ash A of the second chamber 24. The exhaust gas G1 that has reacted with the incineration main ash A is stored as the return gas G2 in the gas phase portion above the second chamber 24. The return gas G2 is sent to the first return gas supply line Lg21 via the outlet port 24o. The return gas G2 is mixed with the outside air G0 taken in through the intake port 16 in the first return gas supply line Lg21. The return gas G2 passing through the first return gas supply line Lg21 has a low temperature.

The low-temperature return gas G2 is sent from the first return gas supply line Lg21 to the heating passage 34 of the heat exchanger 30 via the inlet port 34i. The return gas G2 is heated by exchanging heat with the exhaust gas G1 passing through the cooling chamber 32 in the heating passage 34. The heated return gas G2 is sent to the second return gas supply line Lg22 via the outlet port 34o. The return gas G2 passing through the second return gas supply line Lg22 has a higher temperature than the return gas G2 passing through the first return gas supply line Lg21.

The return gas G2 is sprayed with the condensed water W2 by the spray device 18 at the second return gas supply line Lg22. By spraying the condensed water W2, the water content in the return gas G2 increases. The high temperature and moist return gas G2 is returned to the chimney 10 through the connecting duct 14o and the opening 12o. The return gas G2 returned to the chimney 10 is released into the atmosphere as exhaust gas G1 and water vapor.

The configuration of the chimney 10, the processing device 20, and the heat exchanger 30 is not limited to the first embodiment. For example, in the first embodiment, the chimney 10 is provided with an opening 12i and a connection duct 14i for sending the exhaust gas G1 and an opening 12o and a connection duct 14o for receiving the return gas G2 separately, but as a common opening and a connection duct. It may be provided. The exhaust gas G1 does not have to be drawn from the chimney 10. The supply source of the exhaust gas G1 may be a duct through which the exhaust gas G1 passes, and may be a duct or the like.

The treatment device 20 may be any device as long as it causes a carbonation reaction between the incineration main ash A and the exhaust gas G1. In the processing device 20, the inlet port 22i may be provided in the second chamber 24, and the outlet port 24o may be provided in the first chamber 22. In this case, the first chamber 22 receives the exhaust gas G1 from the second chamber 24 via the partition wall 26.

The heat exchanger 30 may be any as long as it cools the exhaust gas G1 drawn from the chimney 10 and sends it to the processing device 20. The processing device 20 does not have to include, for example, the cleaning device 28.

The condensed water W2 supplied from the water storage tank T2 to the cleaning device 28 or the spraying device 18 may contain suspended substances. Therefore, the alkaline solid reaction product treatment system 1 may include a suspended substance treatment device including a filter such as a strainer in the condensed water discharge line Lw20 or the condensed water supply line Lw22. As a result, it is possible to suppress clogging due to a nozzle for spraying the condensed water W2 on the cleaning device 28 and a suspended substance of the spraying device 18 for spraying the condensed water W2 on the second return gas supply line Lg22. it can.

The spray device 18 may communicate with the first return gas supply line Lg21. The spraying device 18 may spray the atomized condensed water W2 onto the first return gas feeding line Lg21. In this case, the second condensed water supply line Lw222 is connected to the first return gas supply line Lg21.

In the first embodiment, the alkaline solid reaction product treatment system 1 mixes the condensed water W2 with the return gas G2 and returns it to the chimney 10, but the condensed water W2 does not have to be returned to the chimney 10. Further, in the alkaline solid reaction product treatment system 1, in the first embodiment, the condensed water W2 is used as the washing water Wr, but the condensed water W2 may not be used as the washing water Wr. In these cases, the condensed water W2 is purified by, for example, a wastewater treatment facility.

In the first embodiment, the alkaline solid reaction product treatment system 1 sends the return gas G2 and the outside air G0 to the heating passage 34 of the heat exchanger 30, but even if only the outside air G0 is sent to the heating passage 34 of the heat exchanger 30. Good. In this case, the exhaust gas G1 passing through the cooling chamber 32 is cooled by the outside air G0 passing through the heating passage 34. The return gas G2 may be returned to the chimney 10 without going through the heat exchanger 30.

As described above, the alkaline solid reaction product treatment system 1 of the first embodiment includes a chimney 10 (conduit), a treatment device 20, and a heat exchanger 30. The chimney 10 emits exhaust gas G1. The treatment apparatus 20 causes a carbonation reaction between the alkaline solid reactant (incineration main ash A) and the exhaust gas G1. The heat exchanger 30 is provided between the chimney 10 and the processing device 20, and cools the exhaust gas G1 drawn from the chimney 10 and sends it to the processing device 20.

As a result, the temperature of the high-temperature exhaust gas G1 generated from the incineration facility or the like can be lowered by heat exchange. When the exhaust gas G1 having a high calorific value is directly reacted with the alkaline solid reactant, the carbonation reaction, which is a combustion reaction, is inhibited. By lowering the temperature of the exhaust gas G1, the efficiency of the carbonation reaction is improved, and the alkaline solid reactant can be treated efficiently. Moreover, the exhaust gas G1 can be effectively used. By using the exhaust gas G1 for the carbonation reaction, the amount of carbon dioxide emitted from the exhaust gas G1 can be reduced.

In the alkaline solid reactant processing system 1, the heat exchanger 30 receives the exhaust gas G1 that has undergone a carbonation reaction in the processing apparatus 20 as the return gas G2, and cools the exhaust gas G1 by the return gas G2. According to such an alkaline solid reaction product treatment system 1, since the exhaust gas G1 is cooled and the return gas G2 is heated at the same time, the return gas G2 can be effectively used. Further, when the return gas G2 is returned to the chimney 10 by heating the return gas G2, the influence on the chimney 10 can be reduced.

In the alkaline solid reactant treatment system 1, the chimney 10 (conduit) receives the return gas G2 that has cooled the exhaust gas G1 in the heat exchanger 30. According to such an alkaline solid reaction product treatment system 1, the return gas G2 can be discharged into the atmosphere from the chimney 10 as the exhaust gas G1. Therefore, it may be necessary when the return gas G2 is released at a position close to the above-ground part based on the height of the discharge port and the allowable emission amount of sulfur oxide (SO _x ) specified in the Air Pollution Control Act. It is possible to reduce the cleaning process using a property cleaning tower or the like.

The alkaline solid reactant treatment system 1 includes a water supply device P that sends condensed water W2 generated by cooling the exhaust gas G1 in the heat exchanger 30 to the flow path of the return gas G2 (second return gas supply line Lg22). According to such an alkaline solid reaction product treatment system 1, the condensed water W2 can be reduced. Therefore, it is possible to reduce the cleaning process using wastewater treatment equipment or the like required for purifying the condensed water W2.

The alkaline solid reaction product treatment system 1 sends the condensed water W2 generated by cooling the exhaust gas G1 in the heat exchanger 30 to the treatment device 20 and the condensed water W2 to the alkaline solid reaction product (incineration main ash A). ) Is provided as a cleaning device 28 for spraying as cleaning water Wr. According to such an alkaline solid reaction product treatment system 1, the acidic condensed water W2 is used to wash out organic substances such as salts and heavy metals contained in the alkaline solid reaction product, so that the washing can be promoted. In the cleaning of the alkaline solid reaction product, it is preferable to perform cleaning with fresh water W0 after cleaning with the condensed water W2 in order to prevent the piping, the container body 21 and the like from being corroded by the acidic component of the condensed water W2.

In the alkaline solid reactant treatment system 1, the chimney 10 (conduit) receives the exhaust gas G1 that has undergone a carbonation reaction in the treatment device 20 as the return gas G2. According to such an alkaline solid reaction product treatment system 1, the return gas G2 can be discharged into the atmosphere from the chimney 10 as an exhaust gas G1. Therefore, it may be necessary when the return gas G2 is released at a position close to the above-ground part based on the height of the discharge port and the allowable emission amount of sulfur oxide (SO _x ) specified in the Air Pollution Control Act. It is possible to reduce the cleaning process using a property cleaning tower or the like.

In the alkaline solid reaction product treatment system 1, the treatment device 20 includes a container body 21, a first chamber 22, a second chamber 24, and a partition wall 26. The container body 21 has a bottom. The first chamber 22 is provided above the bottom inside the container body 21. The first chamber 22 draws in the exhaust gas G1. The second chamber 24 is provided above the first chamber 22 inside the container main body 21. In the second chamber 24, the contained alkaline solid reactant (incineration main ash A) and the exhaust gas G1 are subjected to a carbonation reaction. The partition wall 26 is provided inside the container main body 21 at intervals with respect to the bottom portion. The partition wall 26 has air permeability and water permeability. The partition wall 26 separates the first chamber 22 and the second chamber 24. The exhaust gas G1 containing carbon dioxide before reacting with the alkaline solid reaction product tends to stay downward as compared with the return gas G2 after reacting with the alkaline solid reaction product. Therefore, according to such an alkaline solid reaction product treatment system 1, the exhaust gas G1 before the reaction can be suppressed from flowing out by drawing the exhaust gas G1 from the first chamber 22 at the lower part of the treatment device 20, so that the exhaust gas G1 Can be more preferably utilized for the carbonation reaction. Since the return gas G2 after the reaction tends to stay upward as compared with the exhaust gas G1, it is stored in the gas phase portion above the processing device 20. As a result, it is possible to suppress a decrease in the efficiency of the carbonation reaction due to the return gas G2 having a reduced carbon dioxide concentration.

As described above, in the processing device 20, the inlet port 22i may be provided in the second chamber 24 and the outlet port 24o may be provided in the first chamber 22. That is, when the exhaust gas G1 is drawn in from the second chamber 24 and discharged from the first chamber 22, the exhaust gas G1 comes into contact with the alkaline solid reactant before the partition wall 26. Therefore, even if an acidic component remains in the exhaust gas G1, the exhaust gas G1 can be neutralized. As a result, corrosion of the partition wall 26 can be suppressed.

The alkaline solid reaction product treatment system 1 includes a plate material in which a plurality of partition walls 26 are laminated. According to such an alkaline solid reaction product treatment system 1, clogging of the holes 26h of the lowermost plate material can be suppressed, so that the maintenance of the treatment apparatus 20 can be performed more preferably.

(Second Embodiment)
[System configuration]
Next, the alkaline solid reaction product treatment system 2 of the second embodiment will be described. FIG. 3 is a schematic view showing an alkaline solid reaction product treatment system according to the second embodiment. The alkaline solid reaction product treatment system 2 includes a chimney 10, a treatment device 20, a water tank T1, a heat exchanger 40, a water tank T3, and a water tank T4. In the alkaline solid reaction product treatment system 2 of the second embodiment, the same reference numerals as those of the alkaline solid reaction product treatment system 1 of the first embodiment are designated by the same reference numerals, and the description thereof is omitted as appropriate, and different configurations are provided. Will be described.

The chimney 10 and the treatment device 20 are connected via an exhaust gas supply line Lg3 and a return gas supply line Lg4. The exhaust gas supply line Lg3 supplies the exhaust gas G1 drawn from the chimney 10 to the processing device 20. The exhaust gas supply line Lg3 passes through the heat exchanger 40. The exhaust gas supply line Lg3 includes a first exhaust gas supply line Lg31, a second exhaust gas supply line Lg32, and a third exhaust gas supply line Lg33. The first exhaust gas supply line Lg31 connects the chimney 10 and the heat exchanger 40. The second exhaust gas supply line Lg32 connects the heat exchanger 40 and the water storage tank T3. The third exhaust gas supply line Lg33 connects the water storage tank T3 and the treatment device 20. The exhaust gas supply line Lg3 is provided with a cleaning dust collector S (alkaline scrubber) for removing the acidic component of the exhaust gas G1 and a blower B (blower) for drawing the exhaust gas G1 from the negative pressure chimney 10. The cleaning dust collector S and the blower B are provided in the third exhaust gas supply line Lg33 in the second embodiment.

The return gas supply line Lg4 supplies the return gas G2 drawn from the processing device 20 to the chimney 10. The return gas supply line Lg4 may be provided with a blower B (blower) for drawing the return gas G2 from the processing device 20.

The water storage tank T3 and the treatment device 20 are connected to each other via the condensed water supply line Lw22 and the washing water supply line Lwr. The condensed water supply line Lw22 supplies the condensed water W2 stored in the water storage tank T3 to the washing water supply line Lwr. The condensed water supply line Lw22 is provided with a water supply device P for drawing the condensed water W2 from the water storage tank T3. The condensed water supply line Lw22 is connected to the wash water supply line Lwr.

Since the fresh water supply line Lw0, the washing water supply line Lwr, and the leaching water discharge line Lw10 have the same configurations as those in the first embodiment, the description thereof will be omitted.

The water storage tank T1 and the water storage tank T4 are connected via the leaching water supply line Lw11. The leaching water supply line Lw11 supplies the leaching water W1 stored in the water storage tank T1 to the water storage tank T4. The leaching water supply line Lw11 is provided with a water supply device P for drawing the leaching water W1 from the water storage tank T1. The heat exchanger 40 and the water storage tank T4 are connected via a leachate discharge line Lw30. The leachate discharge line Lw30 supplies the leachate W3 discharged from the heat exchanger 40 to the water storage tank T4. The water storage tank T4 and the heat exchanger 40 are connected via a cooling water supply line Lw42. The cooling water supply line Lw42 supplies the leachate W1 and the leachate W3 stored as the cooling water W4 from the water storage tank T4 to the heat exchanger 40. The cooling water supply line Lw42 is provided with a water supply device P for drawing the cooling water W4 from the water storage tank T4.

Since the chimney 10 and the processing device 20 have the same configuration as that of the first embodiment, the description thereof will be omitted.

The water storage tank T1 communicates with the leachate discharge line Lw10. The water storage tank T1 receives the leaching water W1 from the leaching water discharge line Lw10. The water storage tank T1 stores the leachate W1. The water storage tank T1 communicates with the leachate water supply line Lw11. The leachate W1 stored in the water storage tank T1 is drawn into the leachate supply line Lw11 by the water supply device P provided in the leachate feed line Lw11.

The heat exchanger 40 is provided between the chimney 10 and the processing device 20. In the second embodiment, the heat exchanger 40 is a heated wastewater concentrator such as a disc dryer. The heat exchanger 40 cools the exhaust gas G1 drawn from the chimney 10. The heat exchanger 40 receives the cooling water W4 stored in the water storage tank T4. The cooling water W4 is heated by the exhaust gas G1 in the heat exchanger 40 and evaporates. The heat exchanger 40 exchanges heat between the amount of sensible heat and latent heat possessed by the exhaust gas G1 and the amount of sensible heat and latent heat possessed by the cooling water W4. The exhaust gas G1 is cooled by the cooling water W4 in the heat exchanger 40. As a result, the temperature and pressure of the exhaust gas G1 decrease. In the second embodiment, the heat exchanger 40 includes an evaporation chamber 42, a cooling passage 44, and a watering device 46.

The evaporation chamber 42 communicates with the cooling water supply line Lw 42 via a sprinkler 46 provided at the upper part. The evaporation chamber 42 receives the cooling water W4 from the cooling water supply line Lw42. The cooling water W4 is sprayed into the evaporation chamber 42. A part of the sprayed cooling water W4 is heated by the exhaust gas G1 and evaporates. A part of the sprayed cooling water W4 is stored in the lower part of the evaporation chamber 42 as leaching water W3. The leachate W3 contains concentrated water and salts obtained by concentrating the cooling water W4. The evaporation chamber 42 further communicates with the leachate discharge line Lw30 via the discharge port 42e. The leaching water W3 stored in the lower part of the evaporation chamber 42 is discharged to the leaching water discharge line Lw30.

The cooling passage 44 is provided so as to pass through the inside of the evaporation chamber 42. The cooling passage 44 includes, for example, a hollow shaft through which the exhaust gas G1 passes and a disc provided on the peripheral surface of the shaft. The cooling passage 44 communicates with the first exhaust gas supply line Lg31 via the inlet port 44i. The cooling passage 44 receives the exhaust gas G1 from the first exhaust gas supply line Lg31. The exhaust gas G1 passes through the cooling passage 44 from the inlet port 44i toward the outlet port 44o. The exhaust gas G1 passing through the cooling passage 44 heats and evaporates the cooling water W4 in the evaporation chamber 42. As a result, the exhaust gas G1 is cooled. The cooling passage 44 communicates with the second exhaust gas supply line Lg32 via the outlet port 44o. The cooling passage 44 sends the cooled exhaust gas G1 to the second exhaust gas supply line Lg32.

The watering device 46 is provided above the evaporation chamber 42. The watering device 46 communicates with the cooling water supply line Lw42. The sprinkler 46 sprinkles the cooling water W4 received from the cooling water supply line Lw 42 into the evaporation chamber 42. The water sprinkler 46 sprays the cooling water W4 on the outside of the cooling passage 44. The watering device 46 may have any configuration as long as the cooling water W4 can be sprayed into the cooling passage 44, and may be sprayed.

The water storage tank T3 communicates with the second exhaust gas supply line Lg32. Since the exhaust gas G1 drawn from the chimney 10 has a high temperature and contains water, the temperature drops in the heat exchanger 40 and the saturated water vapor pressure decreases, so that acidic condensed water W2 having a temperature of 40 ° C. or higher and a pH of 5 or lower is generated. To do. The exhaust gas G1 cooled by the heat exchanger 40 generates condensed water W2. The water storage tank T3 receives the condensed water W2 from the second exhaust gas supply line Lg32. The water storage tank T3 communicates with the third exhaust gas supply line Lg33. The exhaust gas G1 discharged from the condensed water W2 to the water storage tank T3 is sent to the third exhaust gas supply line Lg33. The water storage tank T3 further communicates with the condensed water supply line Lw22. The condensed water W2 stored in the water storage tank T3 is drawn into the condensed water supply line Lw22 by the water supply device P provided in the condensed water supply line Lw22. The condensed water W2 drawn into the condensed water supply line Lw22 is sent to the washing water supply line Lwr. The water storage tank T3 may be connected to the return gas supply line Lg4 via the spray device 18 of the first embodiment shown in FIG. In this case, a part of the condensed water W2 generated from the exhaust gas G1 is atomized by the spraying device 18 and mixed with the return gas G2.

The water storage tank T4 communicates with the leaching water supply line Lw11 and the leaching water discharge line Lw30. The water storage tank T4 receives the leaching water W1 from the leaching water supply line Lw11. The water storage tank T4 receives the leaching water W3 from the leaching water discharge line Lw30. The water storage tank T4 stores the leachate W1 and the leachate W3 as cooling water W4. The water storage tank T4 further communicates with the cooling water supply line Lw42. The cooling water W4 stored in the water storage tank T4 is drawn into the cooling water supply line Lw42 by the water supply device P provided in the cooling water supply line Lw42.

[Gas distribution]
Next, the distribution of the exhaust gas G1 and the return gas G2 in the alkaline solid reaction product treatment system 2 will be described. A part of the exhaust gas G1 in the chimney 10 is sent to the first exhaust gas supply line Lg31 via the opening 12i and the connecting duct 14i. The exhaust gas G1 passing through the first exhaust gas supply line Lg31 has a high temperature of 100 ° C. or higher.

The high-temperature exhaust gas G1 is sent from the first exhaust gas supply line Lg31 to the cooling passage 44 of the heat exchanger 40 via the inlet port 44i. The exhaust gas G1 is cooled in the cooling passage 44 by exchanging heat with the cooling water W4 sprayed in the evaporation chamber 42. The cooled exhaust gas G1 is sent to the second exhaust gas supply line Lg32 via the outlet port 44o. The exhaust gas G1 passing through the second exhaust gas supply line Lg32 has a low temperature of 60 ° C. or lower. As the temperature of the exhaust gas G1 decreases, condensed water W2 is generated downstream of the cooling passage 44 and in the second exhaust gas supply line Lg32. The condensed water W2 is discharged to the water storage tank T3 communicating downstream of the second exhaust gas supply line Lg32.

The low-temperature exhaust gas G1 that has discharged the condensed water W2 into the water storage tank T3 is sent to the third exhaust gas supply line Lg33. The exhaust gas G1 is sent from the third exhaust gas supply line Lg 33 to the first chamber 22 of the processing apparatus 20 via the inlet port 22i. The exhaust gas G1 is sent to the second chamber 24 through the partition wall 26, and undergoes a carbonation reaction with the incineration main ash A of the second chamber 24. The exhaust gas G1 that has reacted with the incineration main ash A is stored as the return gas G2 in the gas phase portion above the second chamber 24. The return gas G2 is sent to the return gas supply line Lg4 via the outlet port 24o. The return gas G2 passing through the return gas supply line Lg4 has a low temperature.

The low-temperature return gas G2 is returned to the chimney 10 from the return gas supply line Lg4 via the connection duct 14o and the opening 12o. The return gas G2 returned to the chimney 10 is released into the atmosphere as exhaust gas G1 and water vapor. A blower B (blower) may be provided on the return gas supply line Lg4.

[Water distribution]
Next, the distribution of the cooling water W4, the leachate water W3, the condensed water W2, the washing water Wr, and the leachate water W1 in the alkaline solid reaction product treatment system 2 will be described. The cooling water W4 stored in the water storage tank T4 is sent to the watering device 46 of the heat exchanger 40 via the cooling water supply line Lw42. The watering device 46 sprays the cooling water W4 into the evaporation chamber 42. The cooling water W4 sprayed on the cooling passage 44 in the evaporation chamber 42 is heated by the exhaust gas G1 passing through the cooling passage 44 and evaporates. The cooling water W4 cools the exhaust gas G1 by the sensible heat when it is heated and the latent heat when it evaporates. The cooling water W4 whose liquid amount has decreased due to evaporation is stored in the lower part of the evaporation chamber 42 as leaching water W3 containing concentrated water and salts. The leaching water W3 stored in the lower part of the evaporation chamber 42 is returned to the water storage tank T4 via the leaching water discharge line Lw30. The leachate W3 returned to the water tank T4 is stored in the water tank T4 as cooling water W4. The cooling water W4 circulates between the heat exchanger 40 and the water storage tank T4. The evaporated solidified material solidified by the evaporation of the cooling water W4 is automatically scraped from the heat transfer portion outside the cooling passage 44 by a scraper or the like provided in the evaporation chamber 42, and discharged from the evaporation chamber 42. Is preferable.

The condensed water W2 generated in the cooling passage 44 of the heat exchanger 40 is discharged to the water storage tank T3 from the downstream end of the second exhaust gas supply line Lg32. The condensed water W2 stored in the water storage tank T3 is sent to the cleaning device 28 of the treatment device 20 via the condensed water supply line Lw22 and the cleaning water supply line Lwr. The cleaning device 28 sprays the condensed water W2 as the cleaning water Wr onto the incinerator main ash A in the second chamber 24. The washing water Wr sprayed by the washing device 28 cleans the incinerator main ash A in the second chamber 24. The washing water Wr washed with the incineration main ash A passes through the partition wall 26 and is stored in the lower part of the first chamber 22 as the leaching water W1. The leachate W1 stored in the lower part of the first chamber 22 is sent to the water storage tank T1 via the leachate discharge line Lw10. The leaching water W1 stored in the water storage tank T1 is sent to the water storage tank T4 via the leaching water supply line Lw11. The leachate W1 received by the water tank T4 is stored in the water tank T4 as cooling water W4. The cooling water W4 circulates between the heat exchanger 40 and the water storage tank T4.

In the alkaline solid reaction product treatment system 2, the leachate W1 and the leachate W3 were used as the cooling water W4 in the second embodiment, but either the leachate W1 or the leachate W3 was used as the cooling water W4. May be good. In the alkaline solid reaction product treatment system 2, fresh water such as groundwater or tap water may be drawn into the sprinkler 46 and used as the cooling water W4. The leachate W1 and the leachate W3 that are not used as the cooling water W4 are purified by, for example, a wastewater treatment facility. In the alkaline solid reaction product treatment system 2, the condensed water W2 was used as the washing water Wr in the second embodiment, but the condensed water W2 was sent back gas via the spray device 18 of the first embodiment shown in FIG. It may be returned to the supply line Lg4.

As described above, in the alkaline solid reaction product treatment system 2 of the second embodiment, the water storage tank T4 for storing the cooling water W4 and the water supply device P for circulating the cooling water W4 between the heat exchanger 40 and the water storage tank T4. And.

As a result, the temperature of the high-temperature exhaust gas G1 generated from the incineration facility or the like can be lowered by heat exchange. When the exhaust gas G1 having a high calorific value is directly reacted with the alkaline solid reactant (incineration main ash A), the carbonation reaction which is a combustion reaction is inhibited. By lowering the temperature of the exhaust gas G1, the efficiency of the carbonation reaction is improved, and the alkaline solid reactant can be treated efficiently. Moreover, the exhaust gas G1 can be effectively used. By using the exhaust gas G1 for the carbonation reaction, the amount of carbon dioxide contained in the exhaust gas G1 can be reduced.

In the alkaline solid reaction product treatment system 2, the water storage tank T4 receives the leachate water W3, which is the cooling water W4 heated to the exhaust gas G1 in the heat exchanger 40, as the cooling water W4 again. According to such an alkaline solid reaction product treatment system 2, the leachate water W3 used as the cooling water W4 can be evaporated by using the calorific value of the high temperature exhaust gas G1. As a result, the leachate W3 can be reduced. Therefore, it is possible to reduce the cleaning process using wastewater treatment equipment or the like necessary for purifying the leachate W3.

The alkaline solid reaction product treatment system 2 includes a cleaning device 28 in which the treatment device 20 sprays washing water Wr for washing the alkaline solid reaction product (incineration main ash A). According to such an alkaline solid reaction product treatment system 2, salts and organic substances contained in the alkaline solid reaction product can be washed out. This makes it possible to more preferably treat the alkaline solid reactants.

In the alkaline solid reaction product treatment system 2, the water storage tank T4 receives the leachate W1 leached from the alkaline solid reaction product (incineration main ash A) as cooling water W4. In the alkaline solid reaction product treatment system 2 of the second embodiment, the alkaline solid reaction product is washed with washing water Wr in the treatment device 20. The washing water Wr after washing the alkaline solid reaction product is alkaline leachate W1 containing salts, heavy metals and the like. According to such an alkaline solid reaction product treatment system 2, the leachate water W1 used as the cooling water W4 can be evaporated by using the calorific value of the high temperature exhaust gas G1. As a result, the leachate W1 can be reduced. Therefore, it is possible to reduce the cleaning process using wastewater treatment equipment or the like necessary for purifying the leachate W1.

(Modified example of the second embodiment)
[System configuration]
Next, the alkaline solid reaction product treatment system 2A of the modified example of the second embodiment will be described. FIG. 4 is a schematic view showing an alkaline solid reaction product treatment system according to a modified example of the second embodiment. In the alkaline solid reaction product treatment system 2A of the modified example, the same configuration as that of the alkaline solid reaction product treatment system 2 of the second embodiment is designated by the same reference numerals, and description thereof will be omitted as appropriate, and different configurations will be described. Compared with the alkaline solid reaction product treatment system 2, the alkaline solid reaction product treatment system 2A replaces the condensed water supply line Lw22, the cooling water supply line Lw42 and the water storage tank T4 with the condensed water discharge line Lw20 and the cooling water supply line. It differs in that it is provided with Lw52 and a water storage tank T5. Further, in the alkaline solid reaction product treatment system 2A, the flow of the exhaust gas G1 and the return gas G2 is the same as that of the alkaline solid reaction product treatment system 2, so the description thereof will be omitted.

The water storage tank T1 and the water storage tank T5 are connected via the leaching water supply line Lw11. The leaching water supply line Lw11 supplies the leaching water W1 stored in the water storage tank T1 to the water storage tank T5. The leaching water supply line Lw11 is provided with a water supply device P for drawing the leaching water W1 from the water storage tank T1. The water storage tank T3 and the water storage tank T5 are connected via a condensed water discharge line Lw20. The condensed water discharge line Lw20 supplies the condensed water W2 stored in the water tank T3 to the water tank T5. The heat exchanger 40 and the water storage tank T5 are connected via the leaching water discharge line Lw30. The leaching water discharge line Lw30 supplies the leaching water W3 discharged from the heat exchanger 40 to the water storage tank T5. The water storage tank T5 and the heat exchanger 40 are connected via a cooling water supply line Lw52. The cooling water supply line Lw52 supplies the leachate W1, the condensed water W2, and the leachate W3 stored as the cooling water W5 from the water storage tank T5 to the heat exchanger 40. The cooling water supply line Lw52 is provided with a water supply device P for drawing the cooling water W5 from the water storage tank T5.

The water storage tank T3 communicates with the second exhaust gas supply line Lg32 and the third exhaust gas supply line Lg33. The relationship between the water storage tank T3 and the second exhaust gas supply line Lg32 and the third exhaust gas supply line Lg33 has the same configuration as that of the second embodiment, and thus the description thereof will be omitted. The water storage tank T3 further communicates with the condensed water discharge line Lw20. The condensed water W2 stored in the water storage tank T3 is sent to the water storage tank T5 via the condensed water discharge line Lw20. The water storage tank T3 may be connected to the return gas supply line Lg4 via the spray device 18 of the first embodiment shown in FIG. In this case, a part of the condensed water W2 generated from the exhaust gas G1 is atomized by the spraying device 18 and mixed with the return gas G2.

The water storage tank T5 communicates with the leachate supply line Lw11, the condensed water discharge line Lw20, and the leachate discharge line Lw30. The water storage tank T5 receives the leachate W1 from the leachate supply line Lw11. The water storage tank T5 receives the condensed water W2 from the condensed water discharge line Lw20. The water storage tank T5 receives the leaching water W3 from the leaching water discharge line Lw30. The water storage tank T5 stores the leaching water W1, the condensed water W2, and the leaching water W3 as the cooling water W5. The water storage tank T5 communicates with the cooling water supply line Lw52. The cooling water W5 stored in the water storage tank T5 is drawn into the cooling water supply line Lw52 by the water supply device P provided in the cooling water supply line Lw52. The cooling water W5 is a mixed water of alkaline leaching water W1 and leaching water W3 and acidic condensed water W2. The mixed water contains salts such as sodium, potassium, calcium, chlorine, sulfate (SO ₄ ) and heavy metals.

[Water distribution]
Next, the distribution of the cooling water W5, the leachate water W3, the condensed water W2, the washing water Wr, and the leachate water W1 in the alkaline solid reaction product treatment system 2A will be described. The cooling water W5 stored in the water storage tank T5 is sent to the sprinkler 46 of the heat exchanger 40 via the cooling water supply line Lw52. The watering device 46 sprays the cooling water W5 into the evaporation chamber 42. The cooling water W5 sprayed on the cooling passage 44 in the evaporation chamber 42 is heated by the exhaust gas G1 passing through the cooling passage 44 and evaporates. The cooling water W5 cools the exhaust gas G1 by the apparent heat when it is heated and the latent heat when it evaporates. The cooling water W5 whose liquid amount has been reduced by evaporation is stored in the lower part of the evaporation chamber 42 as leaching water W3 containing concentrated water and salts. The leaching water W3 stored in the lower part of the evaporation chamber 42 is returned to the water storage tank T5 via the leaching water discharge line Lw30. The leachate W3 returned to the water tank T5 is stored in the water tank T4 as cooling water W5. The cooling water W5 circulates between the heat exchanger 40 and the water storage tank T5.

The condensed water W2 generated in the cooling passage 44 of the heat exchanger 40 is discharged to the water storage tank T3 from the downstream end of the second exhaust gas supply line Lg32. The condensed water W2 stored in the water storage tank T3 is sent to the water storage tank T5 via the condensed water discharge line Lw20. The cooling water W5 circulates between the heat exchanger 40 and the water storage tank T5.

In the processing device 20, the fresh water W0 sprayed as the washing water Wr by the washing device 28 cleans the incinerator main ash A in the second chamber 24. The washing water Wr washed with the incineration main ash A passes through the partition wall 26 and is stored in the lower part of the first chamber 22 as the leaching water W1. The leaching water W1 stored in the lower part of the first chamber 22 is sent to the water tank T1 via the leaching water discharge line Lw10. The leachate W1 stored in the water storage tank T1 is sent to the water storage tank T5 via the leachate water supply line Lw11. The leachate W1 received by the water tank T5 is stored in the water tank T5 as cooling water W5. The cooling water W5 circulates between the heat exchanger 40 and the water storage tank T5.

As described above, in the alkaline solid reaction product treatment system 2A of the modified example of the second embodiment, the water storage tank T5 receives the condensed water W2 generated by cooling the exhaust gas G1 in the heat exchanger 40 as the cooling water W5. ..

As a result, in the water storage tank T5, the cooling water W5 can be brought closer to the neutral direction by mixing the acidic condensed water W2 with the alkaline leaching water W1 and the leaching water W3. Since the cooling water W5 has a lower salt content than the cooling water W4 of the alkaline solid reaction treatment system 2, it is more likely to evaporate in the evaporation chamber 42. Therefore, since the cooling water W5 has a large latent heat, the exhaust gas G1 can be more preferably cooled in the heat exchanger 40.

(Third Embodiment)
[System configuration]
Next, the alkaline solid reaction product treatment system 3 of the third embodiment will be described. FIG. 5 is a schematic view showing an alkaline solid reaction product treatment system according to the third embodiment. In the alkaline solid reaction product treatment system 3 of the third embodiment, the same configuration as that of the alkaline solid reaction product treatment system 2 of the second embodiment is designated by the same reference numerals, and description thereof will be omitted as appropriate, and different configurations will be described. To do. Compared with the alkaline solid reaction product treatment system 2, the alkaline solid reaction product treatment system 3 replaces the exhaust gas supply line Lg3 and the heat exchanger 40 with the exhaust gas supply line Lg5, the first circulating water supply line Lw61, and the second. The difference is that the circulating water supply line Lw62, the heat exchanger 50 and the heat exchanger 60 are provided.

The chimney 10 and the treatment device 20 are connected via an exhaust gas supply line Lg5 and a return gas supply line Lg4. The exhaust gas supply line Lg5 supplies the exhaust gas G1 drawn from the chimney 10 to the treatment device 20. The exhaust gas supply line Lg5 passes through the heat exchanger 50. The exhaust gas supply line Lg5 includes a first exhaust gas supply line Lg51, a second exhaust gas supply line Lg52, and a third exhaust gas supply line Lg53. The first exhaust gas supply line Lg51 connects the chimney 10 and the heat exchanger 50. The second exhaust gas supply line Lg 52 connects the heat exchanger 50 and the water storage tank T3. The third exhaust gas supply line Lg53 connects the water storage tank T3 and the treatment device 20. The exhaust gas supply line Lg5 is provided with a cleaning dust collector S (alkaline scrubber) for removing the acidic component of the exhaust gas G1 and a blower B (blower) for drawing the exhaust gas G1 from the negative pressure chimney 10. The cleaning dust collector S and the blower B are provided in the third exhaust gas supply line Lg53 in the third embodiment. Since the return gas supply line Lg4 has the same configuration as that of the second embodiment, the description thereof will be omitted.

The heat exchanger 50 and the heat exchanger 60 are connected via the first circulating water supply line Lw61 and the second circulating water supply line Lw62. The first circulating water supply line Lw61 supplies the circulating water W6 stored in the lower part of the heat exchanger 50 to the heat exchanger 60. The circulating water W6 is, for example, fresh water such as groundwater or tap water. The first circulating water supply line Lw61 is provided with a water supply device P for supplying the circulating water W6 to the heat exchanger 60. The second circulating water supply line Lw62 supplies the circulating water W6 that has passed through the heat exchanger 60 to the heat exchanger 50.

The heat exchanger 50 is provided between the chimney 10 and the processing device 20. The heat exchanger 50 cools the exhaust gas G1 drawn from the chimney 10. The heat exchanger 50 receives the circulating water W6 cooled by the heat exchanger 60 as cooling water. The circulating water W6 is heated by the exhaust gas G1 in the heat exchanger 50. The heat exchanger 50 exchanges heat between the amount of sensible heat possessed by the exhaust gas G1 and the amount of sensible heat possessed by the circulating water W6. The exhaust gas G1 is cooled by the circulating water W6 in the heat exchanger 50. As a result, the temperature and pressure of the exhaust gas G1 decrease. In the third embodiment, the heat exchanger 50 includes a water immersion chamber 52 and a cooling passage 54.

The flooding chamber 52 communicates with the second circulating water supply line Lw62 via the inlet port 52i. The flooding chamber 52 receives the circulating water W6 from the second circulating water supply line Lw62. The circulating water W6 is stored inside the inundation chamber 52. The circulating water W6 is heated in the flooding chamber 52. The flood chamber 52 communicates with the first circulating water supply line Lw61 via the outlet port 52o. The flooding chamber 52 sends the heated circulating water W6 to the first circulating water supply line Lw61.

The cooling passage 54 is provided so as to pass through the inside of the flood chamber 52. At least a part of the cooling passage 54 is flooded with the circulating water W6 stored in the flooding chamber 52. All of the cooling passages 54 may be submerged in the circulating water W6. The cooling passage 54 communicates with the first exhaust gas supply line Lg51 via the inlet port 54i. The cooling passage 54 receives the exhaust gas G1 from the first exhaust gas supply line Lg51. The exhaust gas G1 passes through the cooling passage 54 from the inlet port 54i toward the outlet port 54o. The circulating water W6 in the flooding chamber 52 cools the exhaust gas G1 passing through the cooling passage 54. As a result, the circulating water W6 is heated. The cooling passage 54 communicates with the second exhaust gas supply line Lg 52 via the outlet port 54o. The cooling passage 54 sends the cooled exhaust gas G1 to the second exhaust gas supply line Lg 52.

The heat exchanger 60 is provided so that the circulating water W6 circulates with the heat exchanger 50. In the third embodiment, the heat exchanger 60 is a heated wastewater concentrator such as a disk dryer. The heat exchanger 60 cools the circulating water W6 drawn from the heat exchanger 50. The heat exchanger 60 receives the cooling water W4 stored in the water storage tank T4. The cooling water W4 is heated by the circulating water W6 in the heat exchanger 60 and evaporates. The heat exchanger 60 exchanges heat between the amount of sensible heat possessed by the circulating water W6 and the amount of sensible heat and latent heat possessed by the cooling water W4. The circulating water W6 is cooled by the cooling water W4 in the heat exchanger 60. As a result, the temperature and pressure of the circulating water W6 decrease. In the third embodiment, the heat exchanger 60 includes an evaporation chamber 62, a cooling passage 64, and a watering device 66.

Since the evaporation chamber 62 and the discharge port 62e have the same configuration as the evaporation chamber 42 and the discharge port 42e of the second embodiment, the description thereof will be omitted. Since the cooling passage 64, the inlet port 64i, and the outlet port 64o have the same configuration as the cooling passage 44, the inlet port 44i, and the outlet port 44o of the second embodiment, the description thereof will be omitted. Since the watering device 66 has the same configuration as the watering device 46 of the second embodiment, the description thereof will be omitted.

[Gas distribution]
Next, the distribution of the exhaust gas G1 and the return gas G2 in the alkaline solid reaction product treatment system 3 will be described. A part of the exhaust gas G1 in the chimney 10 is sent to the first exhaust gas supply line Lg51 via the opening 12i and the connection duct 14i. The exhaust gas G1 passing through the first exhaust gas supply line Lg51 has a high temperature of 100 ° C. or higher.

The high-temperature exhaust gas G1 is sent from the first exhaust gas supply line Lg51 to the cooling passage 54 of the heat exchanger 50 via the inlet port 54i. The exhaust gas G1 is cooled in the cooling passage 54 by exchanging heat with the circulating water W6 stored in the inundation chamber 52. The cooled exhaust gas G1 is sent to the second exhaust gas supply line Lg52 via the outlet port 54o. The exhaust gas G1 passing through the second exhaust gas supply line Lg52 has a low temperature of 60 ° C. or lower. As the temperature of the exhaust gas G1 decreases, condensed water W2 is generated downstream of the cooling passage 54 and in the second exhaust gas supply line Lg 52. The condensed water W2 is discharged to the water storage tank T3 communicating downstream of the second exhaust gas supply line Lg32.

The low-temperature exhaust gas G1 that discharges the condensed water W2 into the water storage tank T3 is sent to the third exhaust gas supply line Lg53. The exhaust gas G1 is sent from the third exhaust gas supply line Lg 33 to the first chamber 22 of the processing apparatus 20 via the inlet port 22i. The exhaust gas G1 is sent to the second chamber 24 through the partition wall 26, and undergoes a carbonation reaction with the incineration main ash A of the second chamber 24. The exhaust gas G1 that has reacted with the incineration main ash A is stored as the return gas G2 in the gas phase portion above the second chamber 24. The return gas G2 is sent to the return gas supply line Lg4 via the outlet port 24o. The return gas G2 passing through the return gas supply line Lg4 has a low temperature.

The low-temperature return gas G2 is returned to the chimney 10 from the return gas supply line Lg4 via the connection duct 14o and the opening 12o. The return gas G2 returned to the chimney 10 is released into the atmosphere as exhaust gas G1 and water vapor. A blower B (blower) may be provided on the return gas supply line Lg4.

[Water distribution]
Next, the circulation of circulating water W6, cooling water W4, leachate W3, condensed water W2, wash water Wr, and leachate W1 in the alkaline solid reaction product treatment system 3 will be described. The circulating water W6 stored in the heat exchanger 50 is heated by the exhaust gas G1 passing through the cooling passage 54. The circulating water W6 cools the exhaust gas G1 by the apparent heat when it is heated. The heated circulating water W6 is sent to the first circulating water supply line Lw61 via the outlet port 52o. The circulating water W6 is sent to the cooling passage 64 of the heat exchanger 60 via the inlet port 64i. The circulating water W6 is cooled in the cooling passage 64 by exchanging heat with the cooling water W4 sprayed in the evaporation chamber 62. The cooled circulating water W6 is sent to the second circulating water supply line Lw62 via the outlet port 64o. The circulating water W6 is returned to the heat exchanger 50 via the inlet port 52i. The circulating water W6 circulates between the heat exchanger 50 and the heat exchanger 60. The circulating water W6 passing through the first circulating water supply line Lw61 has a higher temperature than the circulating water W6 passing through the second circulating water feeding line Lw62.

The cooling water W4 stored in the water storage tank T4 is sent to the watering device 66 of the heat exchanger 60 via the cooling water supply line Lw42. The watering device 66 sprays the cooling water W4 into the evaporation chamber 62. The cooling water W4 sprayed on the cooling passage 64 in the evaporation chamber 62 is heated by the circulating water W6 passing through the cooling passage 64 and evaporates. The cooling water W4 cools the circulating water W6 by the sensible heat when it is heated and the latent heat when it evaporates. The cooling water W4 whose liquid amount has been reduced by evaporation is stored in the lower part of the evaporation chamber 62 as leaching water W3 containing concentrated water and salts. The leaching water W3 stored in the lower part of the evaporation chamber 62 is returned to the water storage tank T4 via the leaching water discharge line Lw30. The leachate W3 returned to the water tank T4 is stored in the water tank T4 as cooling water W4. The cooling water W4 circulates between the heat exchanger 60 and the water storage tank T4.

The condensed water W2 generated in the cooling passage 54 of the heat exchanger 50 is discharged to the water storage tank T3 from the downstream end of the second exhaust gas supply line Lg52. The condensed water W2 stored in the water storage tank T3 is sent to the cleaning device 28 of the treatment device 20 via the condensed water supply line Lw22 and the cleaning water supply line Lwr. The cleaning device 28 sprays the condensed water W2 as the cleaning water Wr onto the incinerator main ash A in the second chamber 24. The washing water Wr sprayed by the washing device 28 cleans the incineration main ash A in the second chamber 24. The washing water Wr washed with the incineration main ash A passes through the partition wall 26 and is stored in the lower part of the first chamber 22 as the leaching water W1. The leachate W1 stored in the lower part of the first chamber 22 is sent to the water storage tank T1 via the leachate discharge line Lw10. The leaching water W1 stored in the water storage tank T1 is sent to the water storage tank T4 via the leaching water supply line Lw11. The leachate W1 received by the water tank T4 is stored in the water tank T4 as cooling water W4. The cooling water W4 circulates between the heat exchanger 50 and the water storage tank T4.

As described above, in the alkaline solid reaction product treatment system 3 of the third embodiment, the heat exchangers are the first heat exchanger (heat exchanger 50) and the second heat exchanger (heat exchanger 60). ,including. The first heat exchanger includes a cooling passage 54 through which the exhaust gas G1 drawn from the chimney 10 (conduit) passes, and a flooding chamber 52 in which the circulating water W6 for cooling the cooling passage 54 is flooded. The second heat exchanger cools the circulating water W6 with the cooling water W4.

As a result, the circulating water W6 such as fresh water cools the cooling passage 54 through which the exhaust gas G1 passes, and the circulating water W6 such as fresh water passes through the cooling passage 64 cooled by the cooling water W4. Corrosion of the heat exchanger 50 and the heat exchanger 60, etc., as compared with the case where the cooling passage 44 through which the exhaust gas G1 passes is directly cooled by the cooling water W4 as in the alkaline solid reaction product treatment system 2 of the second embodiment. Can reduce the risk of occurrence.

The configuration of the heat exchanger 60 is not limited to the third embodiment. For example, the heat exchanger 60 may be a vacuum concentrator. When the heat exchanger 60 is a vacuum concentrator, the cooling water W4 evaporates when the temperature of the cooling passage 64 reaches about 80 ° C. or higher, so that the heat exchanger 60 can evaporate the cooling water W4. The alkaline solid reactant treatment system may include only the heat exchanger 50 and not the heat exchanger 60. The heat generated in the immersion chamber 52 of the heat exchanger 50 may be treated by a general waste heat utilization method such as hot water or device heating.

(Modified example of the third embodiment)
[System configuration]
Next, the alkaline solid reaction product treatment system 3A of the modified example of the third embodiment will be described. FIG. 6 is a schematic view showing an alkaline solid reactant treatment system according to a modified example of the third embodiment. In the alkaline solid reaction product treatment system 3A of the modified example, the same configuration as that of the alkaline solid reaction product treatment system 3 of the third embodiment is designated by the same reference numerals, and description thereof will be omitted as appropriate, and different configurations will be described. Compared with the alkaline solid reaction product treatment system 3, the alkaline solid reaction product treatment system 3A has an exhaust gas supply line Lg5, a leachate water supply line Lw11, a condensed water supply line Lw22, a leachate discharge line Lw30, and a first circulating water feed. Instead of the supply line Lw61, the second circulating water supply line Lw62, the heat exchanger 50, the heat exchanger 60, the water storage tank T3 and the water storage tank T4, the exhaust gas supply line Lg7, the first condensed water supply line Lw101, the second The difference is that it includes a condensed water supply line Lw102, an outside air supply line Lg0, a heat exchanger 100, and a heat exchanger 110.

The chimney 10 and the treatment device 20 are connected via an exhaust gas supply line Lg7 and a return gas supply line Lg4. The exhaust gas supply line Lg7 supplies the exhaust gas G1 drawn from the chimney 10 to the processing device 20. The exhaust gas supply line Lg7 passes through the heat exchanger 100. The exhaust gas supply line Lg7 includes a first exhaust gas supply line Lg71 and a second exhaust gas supply line Lg72. The first exhaust gas supply line Lg71 connects the chimney 10 and the heat exchanger 100. The second exhaust gas supply line Lg72 connects the heat exchanger 100 and the processing device 20. The exhaust gas supply line Lg7 is provided with a cleaning dust collector S (alkaline scrubber) for removing the acidic component of the exhaust gas G1 and a blower B (blower) for drawing the exhaust gas G1 from the negative pressure chimney 10. The cleaning dust collector S and the blower B are provided on the second exhaust gas supply line Lg72 in the modified example of the third embodiment. Since the return gas supply line Lg4 has the same configuration as that of the second embodiment and the third embodiment, the description thereof will be omitted.

The heat exchanger 100 and the heat exchanger 110 are connected via the first condensed water supply line Lw101 and the second condensed water supply line Lw102. The first condensed water supply line Lw101 supplies the condensed water W10 stored in the lower part of the heat exchanger 100 to the heat exchanger 110. The first condensed water supply line Lw101 is provided with a water supply device P for supplying the condensed water W10 to the heat exchanger 110. The second condensed water supply line Lw102 supplies the condensed water W11 stored in the lower part of the heat exchanger 110 to the heat exchanger 100 as cooling water. The second condensed water supply line Lw102 is provided with a water supply device P for supplying cooling water to the heat exchanger 100. The heat exchanger 110 communicates with the outside air supply line Lg0. The outside air supply line Lg0 is provided with a blower B (blower) for drawing the outside air G0 into the heat exchanger 110.

The heat exchanger 100 is provided between the chimney 10 and the processing device 20. The heat exchanger 100 communicates with the first exhaust gas supply line Lg71. The heat exchanger 100 cools the exhaust gas G1 drawn from the chimney 10. The heat exchanger 100 communicates with the second exhaust gas supply line Lg72. The heat exchanger 100 sends the cooled exhaust gas G1 to the second exhaust gas supply line Lg72. The heat exchanger 100 receives the condensed water W11 cooled in the heat exchanger 110 as cooling water. The condensed water W11 is heated by the exhaust gas G1 in the heat exchanger 100. The heat exchanger 100 exchanges heat between the amount of heat possessed by the exhaust gas G1 and the amount of heat possessed by the condensed water W11. The exhaust gas G1 is cooled by the condensed water W11 in the heat exchanger 100. As a result, the temperature and pressure of the exhaust gas G1 decrease. The heat exchanger 100 includes a cooling chamber 102 and a watering device 106 in a modified example of the third embodiment.

The cooling chamber 102 receives the exhaust gas G1 from the first exhaust gas supply line Lg71. Since the exhaust gas G1 drawn from the chimney 10 has a high temperature and contains water, the temperature drops in the heat exchanger 100 and the saturated water vapor pressure decreases, so that acidic condensed water W10 having a temperature of 40 ° C. or higher and a pH of 5 or lower is generated. To do. The exhaust gas G1 cooled by the heat exchanger 100 generates condensed water W10. The generated condensed water W10 is stored in the lower part of the cooling chamber 102. The cooling chamber 102 sends the cooled exhaust gas G1 to the second exhaust gas supply line Lg72. The cooling chamber 102 communicates with the second condensed water supply line Lw 102 via a sprinkler 106 provided at the upper part. The cooling chamber 102 receives the condensed water W11 cooled from the second condensed water supply line Lw102 as cooling water. The condensed water W11 is sprayed in the cooling chamber 102. A part of the sprayed condensed water W11 is heated by the exhaust gas G1. The sprayed condensed water W11 is stored in the lower part of the cooling chamber 102 as the condensed water W10. The cooling chamber 102 further communicates with the first condensed water supply line Lw101. The condensed water W10 stored in the lower part of the cooling chamber 102 is discharged to the first condensed water supply line Lw101.

The heat exchanger 110 is provided so that the condensed waters W10 and W11 circulate with the heat exchanger 100 as circulating water. The heat exchanger 110 is a cooling tower in the modified example of the third embodiment. The heat exchanger 110 communicates with the first condensed water supply line Lw101. The heat exchanger 110 cools the condensed water W10 as the circulating water drawn from the heat exchanger 100 via the first condensed water supply line Lw101. The heat exchanger 110 communicates with the second condensed water supply line Lw102. The heat exchanger 110 sends the cooled condensed water W11 as cooling water to the second condensed water supply line Lw102. The heat exchanger 110 communicates with the outside air supply line Lg0. The heat exchanger 110 takes in the outside air G0 via the outside air supply line Lg0. The outside air G0 is heated by the condensed water W10 in the heat exchanger 110. The heat exchanger 110 cools the condensed water W10 itself by the latent heat of vaporization of the condensed water W10 and the sensible heat exchange with the outside air G0. As a result, the temperature of the condensed water W10 is lowered. In the third embodiment, the heat exchanger 60 includes a cooling chamber 112, a watering device 116, and a carrier 118.

An alkaline material may be put in the heat exchanger 110. Since the condensed water W10 contains an acidic component, the alkaline solid reaction product treatment system 3A is used to neutralize the condensed waters W10 and W11 with the alkaline material of the heat exchanger 110, and to the heat exchanger 100 and the heat exchanger 110. Can be circulated. As a result, corrosion and the like in the pipe can be suppressed.

The cooling chamber 112 receives outside air from the outside air supply line Lg0 via the inlet port 112i. The cooling chamber 112 communicates with the first condensed water supply line Lw101 via a sprinkler 106 provided at the upper part. The cooling chamber 112 receives the heated condensed water W10 from the first condensed water supply line Lw101. The condensed water W10 is sprayed in the cooling chamber 112. The sprayed condensed water W10 is cooled by the outside air G0. The cooled condensed water W10 is stored in the lower part of the cooling chamber 112 as the condensed water W11. The cooling chamber 112 further communicates with the second condensed water supply line Lw102. The condensed water W11 stored in the lower part of the cooling chamber 112 is discharged to the second condensed water supply line Lw102. The cooling chamber 112 is further provided with a carrier 118 as a contact material.

The alkaline solid reaction product treatment system 3A may further include a fresh water supply line connected to the first condensed water supply line Lw101 or the second condensed water supply line Lw102. The fresh water supply line supplies fresh water W0 to the first condensed water supply line Lw101 or the second condensed water supply line Lw102. The amount of condensed water W9 can be adjusted by mixing or substituting the fresh water W0. Moreover, not only the temperature of the condensed waters W10 and W11 can be lowered, but also the salt concentration can be reduced. When the condensed waters W10 and W11 are increased by further providing the fresh water supply line, the condensed waters W10 and W11 may be used as the cleaning water Wr for cleaning the incineration main ash A.

[Gas distribution]
Next, the distribution of the exhaust gas G1 and the return gas G2 in the alkaline solid reaction product treatment system 3A will be described. A part of the exhaust gas G1 in the chimney 10 is sent to the first exhaust gas supply line Lg71 via the opening 12i and the connection duct 14i. The exhaust gas G1 passing through the first exhaust gas supply line Lg71 has a high temperature of 100 ° C. or higher.

The high-temperature exhaust gas G1 is sent from the first exhaust gas supply line Lg71 to the cooling chamber 102 of the heat exchanger 100. The exhaust gas G1 is cooled in the cooling chamber 102 by exchanging heat with the condensed water W11 sprayed in the cooling chamber 102. The cooled exhaust gas G1 is sent to the second exhaust gas supply line Lg72. The exhaust gas G1 passing through the second exhaust gas supply line Lg72 has a low temperature of 60 ° C. or lower. As the temperature of the exhaust gas G1 decreases, condensed water W10 is generated in the cooling chamber 102. The condensed water W10 is stored in the lower part of the cooling chamber 102.

The low-temperature exhaust gas G1 that has discharged the condensed water W10 into the cooling chamber 102 is sent to the first chamber 22 of the treatment apparatus 20 via the second exhaust gas supply line Lg72 and the inlet port 22i. The exhaust gas G1 is sent to the second chamber 24 through the partition wall 26, and undergoes a carbonation reaction with the incineration main ash A of the second chamber 24. The exhaust gas G1 that has reacted with the incineration main ash A is stored as the return gas G2 in the gas phase portion above the second chamber 24. The return gas G2 is sent to the return gas supply line Lg4 via the outlet port 24o. The return gas G2 passing through the return gas supply line Lg4 has a low temperature.

The low temperature return gas G2 is returned to the chimney 10 from the return gas supply line Lg4 via the connection duct 14o and the opening 12o. The return gas G2 returned to the chimney 10 is released into the atmosphere as exhaust gas G1 and water vapor. A blower B (blower) may be provided on the return gas supply line Lg4.

[Water distribution]
Next, the distribution of the condensed waters W10 and W11, the washing water Wr, and the leachate W1 in the alkaline solid reaction product treatment system 3A will be described. In the heat exchanger 100, the condensed water W10 generated from the exhaust gas G1 is stored in the lower part of the cooling chamber 102. The condensed water W11 cooled in the heat exchanger 110 is sent to the sprinkler 106 of the heat exchanger 100 via the second condensed water supply line Lw102. The watering device 106 sprays the condensed water W11 as cooling water in the cooling chamber 102. The condensed water W11 sprayed on the cooling chamber 102 is heated by the exhaust gas G1 passing through the cooling chamber 102. The condensed water W11 cools the exhaust gas G1 by the apparent heat when it is heated. The condensed water W11 whose liquid amount has decreased due to evaporation is stored in the lower part of the cooling chamber 102 as the condensed water W10. The condensed water W10 stored in the lower part of the cooling chamber 102 is sent to the sprinkler 116 of the heat exchanger 110 via the first condensed water supply line Lw101. The sprinkler 116 sprinkles the condensed water W10 into the cooling chamber 112. The condensed water W10 sprayed on the cooling chamber 112 is cooled by exchanging heat with the outside air G0 taken into the cooling chamber 112. The cooled condensed water W10 is sent to the second condensed water supply line Lw102 as the condensed water W11. The condensed waters W10 and W11 circulate between the heat exchanger 100 and the heat exchanger 110. The condensed water W11 passing through the second condensed water feeding line Lw102 has a lower temperature than the condensed water W10 passing through the first condensed water feeding line Lw101.

In the processing device 20, the fresh water W0 sprayed as the washing water Wr by the washing device 28 cleans the incinerator main ash A in the second chamber 24. The washing water Wr washed with the incineration main ash A passes through the partition wall 26 and is stored in the lower part of the first chamber 22 as the leaching water W1. The leaching water W1 stored in the lower part of the first chamber 22 is sent to the water tank T1 via the leaching water discharge line Lw10. The leachate W1 stored in the water storage tank T1 is treated as wastewater. The water storage tank T1 is connected to a wastewater treatment facility that treats the leachate W1 as wastewater, for example, via a water supply device. The leachate W1 is sent to the treatment tank of the wastewater treatment facility by, for example, a water supply device.

As described above, in the alkaline solid reaction product treatment system 3A of the modified example of the third embodiment, the heat exchangers are the first heat exchanger (heat exchanger 100) and the second heat exchanger (heat exchanger). 110) and the water supply device P. The water supply device P circulates circulating water (condensed water W10, W11) between the first heat exchanger and the second heat exchanger. The first heat exchanger includes a cooling chamber 102 that cools the exhaust gas G1 drawn from the conduit (chimney 10) with circulating water, and a sprinkler 106 that sprays the circulating water to the cooling chamber 102. The second heat exchanger cools the circulating water with a cooling medium (outside air G0).

As a result, the condensed water W11 which is circulating water cools the cooling chamber 102 through which the exhaust gas G1 passes, and the condensed water W10 which is circulating water passes through the cooling chamber 112 cooled by the outside air G0. The exhaust gas G1 can be brought into contact with water in the heat exchanger 100. By bringing the exhaust gas G1 into contact with water, it is possible to prevent the condensed water W10 generated by lowering the temperature of the exhaust gas G1 from being generated in the piping of the second exhaust gas supply line Lg72 and becoming a dew condensation state. By suppressing the generation of condensed water W10 in the pipe, it is possible to suppress corrosion of the condensed water W10 due to the acidic component. The circulating condensed waters W10 and W11 evaporate and the amount of water decreases, but since the condensed water W10 is generated from the exhaust gas G1 cooled in the cooling chamber 102, it is not necessary to supply new water. Since it is not necessary to provide a device for supplying water, the equipment cost can be suppressed. In addition, the entire facility can be made compact.

In the alkaline solid reactant treatment system 3A, the cooling medium is gas (outside air G0). As a result, it is not necessary to provide a device for storing and supplying the cooling water, so that the equipment cost can be suppressed. In addition, the entire facility can be made compact.

The configuration of the second heat exchanger (heat exchanger 110) is not limited to the modified example of the third embodiment. The second heat exchanger may cool the circulating water (condensed water W10, W11) by, for example, a liquid cooling medium. That is, the cooling medium may be a liquid.

(Fourth Embodiment)
[System configuration]
Next, the alkaline solid reaction product treatment system 4 of the fourth embodiment will be described. FIG. 7 is a schematic view showing an alkaline solid reaction product treatment system according to the fourth embodiment. In the alkaline solid reaction product treatment system 4 of the fourth embodiment, the same components as those of the alkaline solid reaction product treatment system 3 of the third embodiment are designated by the same reference numerals, and description thereof will be omitted as appropriate, and different configurations will be described. To do. Compared with the alkaline solid reaction product treatment system 3, the alkaline solid reaction product treatment system 4 replaces the exhaust gas supply line Lg5, the condensed water supply line Lw22 and the heat exchanger 50 with the exhaust gas supply line Lg6 and the condensed water supply line. It differs in that it includes Lw71, condensed water discharge line Lw80, condensed water supply line Lw82, condensed water supply line Lw91, condensed water supply line Lw92, heat exchanger 70, removal device 80, water storage tank T6, and heat exchanger 90. ..

The chimney 10 and the treatment device 20 are connected via an exhaust gas supply line Lg6 and a return gas supply line Lg4. The exhaust gas supply line Lg6 supplies the exhaust gas G1 drawn from the chimney 10 to the processing device 20. The exhaust gas supply line Lg6 passes through the heat exchanger 70. The exhaust gas supply line Lg6 includes a first exhaust gas supply line Lg61 and a second exhaust gas supply line Lg62. The first exhaust gas supply line Lg61 connects the chimney 10 and the heat exchanger 70. The second exhaust gas supply line Lg 62 connects the heat exchanger 70 and the processing device 20. The exhaust gas supply line Lg6 is provided with a cleaning dust collector S (alkaline scrubber) for removing the acidic component of the exhaust gas G1 and a blower B (blower) for drawing the exhaust gas G1 from the negative pressure chimney 10. The cleaning dust collector S and the blower B are provided in the second exhaust gas supply line Lg62 in the fourth embodiment. Since the return gas supply line Lg4 has the same configuration as that of the second embodiment and the third embodiment, the description thereof will be omitted.

The heat exchanger 70 and the removing device 80 are connected via a condensed water supply line Lw71. The condensed water supply line Lw71 supplies the condensed water W7 discharged from the heat exchanger 70 to the removing device 80. The condensed water supply line Lw71 is provided with a water supply device P for drawing the condensed water W7 from the heat exchanger 70. The removing device 80 and the water storage tank T6 are connected via a condensed water discharge line Lw80. The condensed water discharge line Lw80 supplies the condensed water W9 stored in the removing device 80 to the water storage tank T6 as the condensed water W8. The water storage tank T6 and the treatment device 20 are connected to each other via the condensed water supply line Lw82 and the washing water supply line Lwr. The condensed water supply line Lw82 supplies the condensed water W8 stored in the water storage tank T6 to the washing water supply line Lwr. The condensed water supply line Lw82 is provided with a water supply device P for drawing the condensed water W2 from the water storage tank T6. The condensed water supply line Lw82 is connected to the washing water supply line Lwr. The removing device 80 and the heat exchanger 90 are connected via the condensed water supply line Lw91. The condensed water supply line Lw91 supplies the condensed water W9 stored in the removing device 80 to the heat exchanger 90. The condensed water supply line Lw91 is provided with a water supply device P for drawing the condensed water W9 from the removal device 80. The heat exchanger 90 and the heat exchanger 70 are connected via a condensed water supply line Lw92. The condensed water supply line Lw92 supplies the condensed water W9 cooled in the heat exchanger 90 to the heat exchanger 70.

The heat exchanger 90 and the heat exchanger 60 are connected via the first circulating water supply line Lw61 and the second circulating water supply line Lw62. The first circulating water supply line Lw61 supplies the circulating water W6 stored in the lower part of the heat exchanger 90 to the heat exchanger 60. The first circulating water supply line Lw61 is provided with a water supply device P for supplying the circulating water W6 to the heat exchanger 60. The second circulating water supply line Lw62 supplies the circulating water W6 that has passed through the heat exchanger 60 to the heat exchanger 90.

The heat exchanger 70 is provided between the chimney 10 and the processing device 20. The heat exchanger 70 communicates with the first exhaust gas supply line Lg61. The heat exchanger 70 cools the exhaust gas G1 drawn from the chimney 10. The heat exchanger 70 communicates with the second exhaust gas supply line Lg62. The heat exchanger 70 sends the cooled exhaust gas G1 to the second exhaust gas supply line Lg62. The heat exchanger 70 receives the condensed water W9 cooled in the heat exchanger 90 as cooling water. The condensed water W9 is heated by the exhaust gas G1 in the heat exchanger 70. The heat exchanger 70 exchanges heat between the amount of heat possessed by the exhaust gas G1 and the amount of heat possessed by the condensed water W9. The exhaust gas G1 is cooled by the condensed water W9 in the heat exchanger 70. As a result, the temperature and pressure of the exhaust gas G1 decrease. In the fourth embodiment, the heat exchanger 70 includes a cooling chamber 72 and a watering device 76.

The cooling chamber 72 receives the exhaust gas G1 from the first exhaust gas supply line Lg61. Since the exhaust gas G1 drawn from the chimney 10 has a high temperature and contains water, the temperature drops in the heat exchanger 70 and the saturated water vapor pressure decreases, so that acidic condensed water W7 having a temperature of 40 ° C. or higher and a pH of 5 or lower is generated. To do. The exhaust gas G1 cooled by the heat exchanger 70 generates condensed water W7. The generated condensed water W7 is stored in the lower part of the cooling chamber 72. The cooling chamber 72 sends the cooled exhaust gas G1 to the second exhaust gas supply line Lg62. The cooling chamber 72 communicates with the condensed water supply line Lw 92 via the watering device 76 provided at the upper part. The cooling chamber 72 receives the condensed water W9 cooled from the condensed water supply line Lw92 as cooling water. The condensed water W9 is sprayed into the cooling chamber 72. A part of the sprayed condensed water W9 is heated by the exhaust gas G1 and evaporates. A part of the sprayed condensed water W9 is stored in the lower part of the cooling chamber 72 as the condensed water W7. The cooling chamber 72 further communicates with the condensed water supply line Lw71. The condensed water W7 stored in the lower part of the cooling chamber 72 is discharged to the condensed water supply line Lw71. The alkaline solid reaction product treatment system 4 may further include a fresh water supply line connected to the condensed water supply line Lw92. The fresh water supply line supplies fresh water W0 to the condensed water supply line Lw92. By mixing fresh water W0, the amount of condensed water W9 can be adjusted. Moreover, since the temperature of the condensed water W9 can be lowered, the salt concentration can be reduced.

The removing device 80 communicates with the condensed water supply line Lw71. The removing device 80 receives the condensed water W7 from the condensed water supply line Lw71. Condensed water W7 may contain suspended material. The removing device 80 removes the suspended substance of the condensed water W7. The removing device 80 communicates with the condensed water discharge line Lw80. The condensed water discharge line Lw80 supplies the condensed water W9 discharged from the removing device 80 to the water tank T6 as the condensed water W9. The removing device 80 further communicates with the condensed water supply line Lw91. The condensed water W7 from which the suspended substance has been removed is sent to the condensed water supply line Lw91 as the condensed water W9. In the fourth embodiment, the removal device 80 includes a pre-removal chamber 82, a post-removal chamber 84, and a partition wall 86.

The removal front chamber 82 communicates with the condensed water supply line Lw71. The removal pre-removal chamber 82 receives the condensed water W7 from the condensed water supply line Lw71. The removal front chamber 82 stores the condensed water W7 in the lower part. The post-removal chamber 84 is provided on the side of the pre-removal chamber 82 across the partition wall 86. In the post-removal chamber 84, the condensed water W7 from which the suspended substance has been removed is stored in the lower portion as the condensed water W9. After removal, the chamber 84 communicates with the condensed water supply line Lw91. After removal, the chamber 84 sends the condensed water W9 to the condensed water supply line Lw91. The post-removal chamber 84 further communicates with the condensed water discharge line Lw80. The condensed water discharge line Lw80 supplies the condensed water W9 discharged from the chamber 84 after removal to the water storage tank T6 as the condensed water W8. The partition wall 86 is a plate material that separates the pre-removal chamber 82 and the post-removal chamber 84. The partition wall 86 has water permeability. The partition wall 86 includes, for example, a strainer, a filter, and the like. Suspended substances are removed from the condensed water W7 stored in the pre-removal chamber 82 by passing through the partition wall 86. The removing device 80 is not limited to the above-described configuration as long as it has a structure capable of removing suspended substances. The removing device 80 may be a filter, a strainer, or the like.

The water storage tank T6 communicates with the condensed water discharge line Lw80. The water storage tank T6 receives the condensed water W9 from the condensed water discharge line Lw80. The water storage tank T6 stores the condensed water W9 as the condensed water W8. The water storage tank T6 communicates with the condensed water supply line Lw82. The condensed water W8 stored in the water storage tank T6 is drawn into the condensed water supply line Lw82 by the water supply device P provided in the condensed water supply line Lw82. The condensed water W8 drawn into the condensed water supply line Lw82 is sent to the washing water supply line Lwr. The water storage tank T6 may be connected to the return gas supply line Lg4 via the spray device 18 of the first embodiment shown in FIG. In this case, a part of the condensed water W8 generated from the exhaust gas G1 and from which the suspended substance has been removed is atomized by the spraying device 18 and mixed with the return gas G2.

The heat exchanger 90 is provided between the removal device 80 and the heat exchanger 70 in the fourth embodiment. The heat exchanger 90 cools the condensed water W9 drawn from the removing device 80. The heat exchanger 90 receives the circulating water W6 cooled by the heat exchanger 60 as cooling water. The circulating water W6 is heated to the condensed water W9 in the heat exchanger 90. The heat exchanger 90 exchanges heat between the amount of sensible heat possessed by the condensed water W9 and the amount of sensible heat possessed by the circulating water W6. The condensed water W9 is cooled to the circulating water W6 in the heat exchanger 90. As a result, the temperature and pressure of the condensed water W9 are lowered. In the fourth embodiment, the heat exchanger 90 includes a water immersion chamber 92 and a cooling passage 94.

Since the flood chamber 92, the inlet port 92i and the outlet port 92o have the same configuration as the flood chamber 52, the inlet port 52i and the outlet port 52o of the third embodiment, the description thereof will be omitted. Since the cooling passage 94, the inlet port 94i, and the outlet port 94o have the same configuration as the cooling passage 54, the inlet port 54i, and the outlet port 54o of the third embodiment, the description thereof will be omitted.

[Gas distribution]
Next, the distribution of the exhaust gas G1 and the return gas G2 in the alkaline solid reaction product treatment system 4 will be described. A part of the exhaust gas G1 in the chimney 10 is sent to the first exhaust gas supply line Lg61 via the opening 12i and the connecting duct 14i. The exhaust gas G1 passing through the first exhaust gas supply line Lg61 has a high temperature of 100 ° C. or higher.

The high-temperature exhaust gas G1 is sent from the first exhaust gas supply line Lg 61 to the cooling chamber 72 of the heat exchanger 70. The exhaust gas G1 is cooled in the cooling chamber 72 by exchanging heat with the condensed water W9 sprayed in the cooling chamber 72. The cooled exhaust gas G1 is sent to the second exhaust gas supply line Lg62. The exhaust gas G1 passing through the second exhaust gas supply line Lg62 has a low temperature of 60 ° C. or lower. As the temperature of the exhaust gas G1 decreases, condensed water W7 is generated in the cooling chamber 72. The condensed water W7 is stored in the lower part of the cooling chamber 72.

The low-temperature exhaust gas G1 that has discharged the condensed water W7 into the cooling chamber 72 is sent to the first chamber 22 of the treatment apparatus 20 via the second exhaust gas supply line Lg62 and the inlet port 22i. The exhaust gas G1 is sent to the second chamber 24 through the partition wall 26, and undergoes a carbonation reaction with the incineration main ash A of the second chamber 24. The exhaust gas G1 that has reacted with the incineration main ash A is stored as the return gas G2 in the gas phase portion above the second chamber 24. The return gas G2 is sent to the return gas supply line Lg4 via the outlet port 24o. The return gas G2 passing through the return gas supply line Lg4 has a low temperature.

The low temperature return gas G2 is returned to the chimney 10 from the return gas supply line Lg4 via the connection duct 14o and the opening 12o. The return gas G2 returned to the chimney 10 is released into the atmosphere as exhaust gas G1 and water vapor. A blower B (blower) may be provided on the return gas supply line Lg4.

[Water distribution]
Next, the circulation of condensed water W7, condensed water W9, circulating water W6, cooling water W4, leachate W3, condensate water W8, wash water Wr, and leachate W1 in the alkaline solid reaction product treatment system 4 will be described. In the heat exchanger 70, the condensed water W7 generated from the exhaust gas G1 is stored in the lower part of the cooling chamber 72. The condensed water W9 cooled in the heat exchanger 90 is sent to the sprinkler 76 of the heat exchanger 70 via the condensed water supply line Lw92. The sprinkler 76 sprinkles the condensed water W9 as cooling water in the water immersion chamber 92. The condensed water W9 sprayed on the flooding chamber 92 is heated by the exhaust gas G1 passing through the flooding chamber 92 and evaporates. The condensed water W9 cools the exhaust gas G1 by the apparent heat when it is heated and the latent heat when it evaporates. The condensed water W9 whose liquid amount has decreased due to evaporation is stored in the lower part of the immersion chamber 92 as the condensed water W7. The condensed water W7 stored in the lower part of the flooding chamber 92 is sent to the removing device 80 via the condensed water supply line Lw71. In the removing device 80, the condensed water W7 is sent from the pre-removal chamber 82 through the partition wall 86 to the post-removal chamber 84 to remove the suspended substance. A part of the condensed water W7 from which the suspended substance has been removed is sent as the condensed water W9 to the cooling passage 94 of the heat exchanger 90 via the condensed water supply line Lw91. The condensed water W9 is sent from the condensed water supply line Lw91 to the cooling passage 94 of the heat exchanger 90 via the inlet port 94i. The condensed water W9 is cooled in the cooling passage 94 by exchanging heat with the circulating water W6 stored in the inundation chamber 92. The cooled condensed water W9 is sent to the condensed water supply line Lw92 via the outlet port 94o. The condensed water W9 circulates between the heat exchanger 70 and the heat exchanger 90. The condensed water W9 passing through the condensed water supply line Lw92 has a lower temperature than the condensed water W9 passing through the condensed water supply line Lw91.

The circulating water W6 stored in the heat exchanger 90 is heated by the condensed water W9 passing through the cooling passage 94. The circulating water W6 cools the condensed water W9 by the sensible heat when it is heated. The heated circulating water W6 is sent to the first circulating water supply line Lw61 via the outlet port 92o. The circulating water W6 is sent to the cooling passage 64 of the heat exchanger 60 via the inlet port 64i. The circulating water W6 is cooled in the cooling passage 64 by exchanging heat with the cooling water W4 sprayed in the evaporation chamber 62. The cooled circulating water W6 is sent to the second circulating water supply line Lw62 via the outlet port 64o. The circulating water W6 is returned to the heat exchanger 90 via the inlet port 92i. The circulating water W6 circulates between the heat exchanger 90 and the heat exchanger 60. The circulating water W6 passing through the first circulating water supply line Lw61 has a higher temperature than the circulating water W6 passing through the second circulating water feeding line Lw62.

The cooling water W4 stored in the water storage tank T4 is sent to the watering device 66 of the heat exchanger 60 via the cooling water supply line Lw42. The watering device 66 sprays the cooling water W4 into the evaporation chamber 62. The cooling water W4 sprayed on the cooling passage 64 in the evaporation chamber 62 is heated by the circulating water W6 passing through the cooling passage 64 and evaporates. The cooling water W4 cools the circulating water W6 by the sensible heat when it is heated and the latent heat when it evaporates. The cooling water W4 whose liquid amount has been reduced by evaporation is stored in the lower part of the evaporation chamber 62 as leaching water W3 containing concentrated water and salts. The leaching water W3 stored in the lower part of the evaporation chamber 62 is returned to the water storage tank T4 via the leaching water discharge line Lw30. The leachate W3 returned to the water tank T4 is stored in the water tank T4 as cooling water W4. The cooling water W4 circulates between the heat exchanger 60 and the water storage tank T4.

In the removing device 80, a part of the condensed water W7 from which the suspended substance has been removed is sent to the water storage tank T6 as the condensed water W8 via the condensed water discharge line Lw80. The condensed water W8 stored in the water storage tank T6 is sent to the cleaning device 28 of the treatment device 20 via the condensed water supply line Lw82 and the cleaning water supply line Lwr. The cleaning device 28 sprays the condensed water W8 as the cleaning water Wr onto the incineration main ash A in the second chamber 24. The washing water Wr sprayed by the washing device 28 cleans the incinerator main ash A in the second chamber 24. The washing water Wr washed with the incineration main ash A passes through the partition wall 26 and is stored in the lower part of the first chamber 22 as the leaching water W1. The leachate W1 stored in the lower part of the first chamber 22 is sent to the water storage tank T1 via the leachate discharge line Lw10. The leaching water W1 stored in the water storage tank T1 is sent to the water storage tank T4 via the leaching water supply line Lw11. The leachate W1 received by the water tank T4 is stored in the water tank T4 as cooling water W4. The cooling water W4 circulates between the heat exchanger 60 and the water storage tank T4.

As described above, in the alkaline solid reaction product treatment system 4 of the fourth embodiment, the heat exchangers are the first heat exchanger (heat exchanger 70) and the second heat exchanger (heat exchanger 90). , A third heat exchanger (heat exchanger 60), and the like. The first heat exchanger includes a cooling chamber 72 through which the exhaust gas G1 drawn from the chimney 10 (conduit) passes, and a sprinkler 76 for spraying condensed waters W7 and W9 generated by cooling the exhaust gas G1 into the cooling chamber 72. Be prepared. The second heat exchanger includes a cooling passage 94 through which the condensed water W9 passes, and a flooding chamber 92 in which the circulating water W6 for cooling the cooling passage 94 is flooded. The third heat exchanger cools the circulating water W6 with the cooling water W4.

As a result, the exhaust gas G1 can be brought into contact with water in the heat exchanger 70. By bringing the exhaust gas G1 into contact with water, it is possible to prevent the condensed water W7 generated by lowering the temperature of the exhaust gas G1 from being generated in the piping of the second exhaust gas supply line Lg62 and becoming a dew condensation state. By suppressing the generation of condensed water W7 in the pipe, it is possible to suppress corrosion of the condensed water W7 due to the acidic component.

The configuration of the third heat exchanger (heat exchanger 60) is not limited to the fourth embodiment. The third heat exchanger may cool the circulating water W6 by, for example, a cooling medium other than the cooling water W4. That is, in the alkaline solid reaction product treatment system, the heat exchangers are the first heat exchanger (heat exchanger 70), the second heat exchanger (heat exchanger 90), the third heat exchanger, and the first. The first water supply device that circulates the first circulating water (condensed water W7, W9) between the heat exchanger and the second heat exchanger, and the second circulating water (circulation) between the second heat exchanger and the third heat exchanger. A second water supply device for circulating water W6) may be included. The first heat exchanger includes a cooling chamber 72 that cools the exhaust gas G1 drawn from the chimney 10 (conduit) with the first circulating water, and a sprinkler 76 that sprays the first circulating water into the cooling chamber 72. The second heat exchanger includes a cooling passage 94 through which the first circulating water passes, and an inundation chamber 92 in which the second circulating water for cooling the cooling passage 94 is flooded. The third heat exchanger cools the second circulating water with a cooling medium. The cooling medium is a liquid such as tap water or a gas such as outside air.

Although the embodiments of the present invention have been described above, the embodiments are not limited by the contents of the embodiments. For example, in the alkaline solid reaction product treatment system 4 of the fourth embodiment, the heat exchanger 90 may not be provided, and the heat exchanger 60 of the third embodiment may be provided downstream of the heat exchanger 70 and the removing device 80. Specifically, the condensed water supply line Lw91 communicates with the cooling passage 64 via the inlet port 64i, the cooling passage 64 communicates with the condensed water supply line Lw92 via the outlet port 64o, and is condensed in the cooling passage 64. The water W9 may be provided so as to be cooled. As a result, the generated condensed water can be evaporated and the weight can be reduced.

1, 2, 2A, 3, 3A, 4 Alkaline solid reactant treatment system 10 Chimney (conduit)
12i, 12o Opening 14i, 14o Connection duct 16 Intake port 18 Spraying device 20 Processing device 21 Container body 22 1st room 24 2nd room 26 Partition 26h hole 28 Cleaning device 30, 40, 50, 60, 70, 90, 100, 110 Heat exchanger 32, 72, 102, 112 Cooling chamber 34 Heating passage 42, 62 Evaporation chamber 52, 92 Immersion chamber 44, 54, 64, 94 Cooling passage 46, 66, 76, 106, 116 Sprinkler 80 Removal device 82 Pre-removal chamber 84 Post-removal chamber 86 Partition wall 118 Carrier 22i, 32i, 34i, 44i, 52i, 54i, 64i, 92i, 94i, 112i Inlet ports 24o, 32o, 34o, 44o, 52o, 54o, 64o, 92o, 94o Outlet port 22e, 32e, 42e, 62e Discharge port T1, T2, T3, T4, T5, T6 Water storage tank Lg0 Outside air supply line Lg1, Lg3, Lg5, Lg6, Lg7 Exhaust gas supply line Lg11, Lg31, Lg51, Lg61, Lg71 1 Exhaust gas supply line Lg12, Lg32, Lg52, Lg62, Lg72 2nd exhaust gas supply line Lg33, Lg53 3rd exhaust gas supply line Lg2, Lg4 Return gas supply line Lg21 1st return gas supply line Lg22 2nd return gas supply line Lw0 Fresh water supply line Lwr Washing water supply line Lw10, Lw30 Leachate discharge line Lw11 Leachate supply line Lw20, Lw80 Condensed water discharge line Lw71, Lw91 Condensed water supply line Lw22, Lw82, Lw92 Condensed water supply line Lw221 Water supply line Lw222 2nd condensed water supply line Lw42, Lw52 Cooling water supply line Lw61 1st circulating water supply line Lw62 2nd circulating water supply line Lw101 1st condensed water supply line Lw102 2nd condensed water supply line S Washing dust collector B Blower P Water blower V Valve A Incineration main ash G0 Outside air G1 Exhaust gas G2 Return gas W0 Fresh water Wr Washing water W1, W3 Leached water W2, W7, W8, W9, W10, W11 Condensed water W4, W5 Cooling water W6 circulating water

Claims (19)

The conduit through which the exhaust gas passes and
A processing device that causes a carbonation reaction between an alkaline solid reactant and the exhaust gas,
A heat exchanger provided between the conduit and the treatment device, which cools the exhaust gas drawn from the conduit and sends it to the treatment device.
Alkaline solid reactant treatment system. The alkaline solid reactant treatment system according to claim 1, wherein the heat exchanger receives the exhaust gas that has undergone a carbonation reaction in the treatment apparatus as a return gas, and cools the exhaust gas with the return gas. The alkaline solid reaction treatment system according to claim 2, wherein the conduit receives the return gas obtained by cooling the exhaust gas in the heat exchanger. The alkaline solid reaction product treatment system according to claim 2 or 3, further comprising a water supply device for sending condensed water generated by cooling the exhaust gas in the heat exchanger to the return gas flow path. A water supply device that sends condensed water generated by cooling the exhaust gas in the heat exchanger to the treatment device, and
A cleaning device that sprays the condensed water as cleaning water for cleaning the alkaline solid reaction product.
The alkaline solid reaction product treatment system according to any one of claims 1 to 4. A water tank that stores cooling water and
A water supply device that circulates the cooling water between the heat exchanger and the water storage tank.
The alkaline solid reaction product treatment system according to claim 1. The alkaline solid reaction product treatment system according to claim 6, wherein the water storage tank receives the leachate, which is the cooling water heated to the exhaust gas in the heat exchanger, as the cooling water again. The alkaline solid reaction treatment system according to claim 6 or 7, wherein the water storage tank receives condensed water generated by cooling the exhaust gas in the heat exchanger as the cooling water. The heat exchanger includes a first heat exchanger and a second heat exchanger.
The first heat exchanger includes a cooling passage through which the exhaust gas drawn from the conduit passes, and an inundation chamber in which circulating water for cooling the cooling passage is infiltrated.
The alkaline solid reactant treatment system according to claim 6, wherein the second heat exchanger cools the circulating water with the cooling water. The heat exchanger includes a first heat exchanger, a second heat exchanger, and a third heat exchanger.
The first heat exchanger includes a cooling chamber through which the exhaust gas drawn from the conduit passes, and a sprinkler device for spraying condensed water generated by cooling the exhaust gas into the cooling chamber.
The second heat exchanger includes a cooling passage through which the condensed water passes and an inundation chamber in which the circulating water for cooling the cooling passage is infiltrated.
The alkaline solid reaction treatment system according to claim 6, wherein the third heat exchanger cools the circulating water with the cooling water. The alkaline solid-reactant treatment system according to claim 10, wherein the water storage tank receives leachate leached from the alkaline solid-reactant as cooling water. The heat exchanger includes a first heat exchanger, a second heat exchanger, and a water feeding device for circulating circulating water between the first heat exchanger and the second heat exchanger.
The first heat exchanger includes a cooling chamber that cools the exhaust gas drawn from the conduit with the circulating water, and a sprinkler that sprays the circulating water into the cooling chamber.
The alkaline solid reactant treatment system according to claim 1, wherein the second heat exchanger cools the circulating water with a cooling medium. The heat exchanger circulates the first circulating water between the first heat exchanger, the second heat exchanger, the third heat exchanger, and the first heat exchanger and the second heat exchanger. 1 Water supply device, and a second water supply device that circulates second circulating water to the second heat exchanger and the third heat exchanger.
The first heat exchanger includes a cooling chamber that cools the exhaust gas drawn from the conduit with the first circulating water, and a sprinkler that sprays the first circulating water into the cooling chamber.
The second heat exchanger includes a cooling passage through which the first circulating water passes and an inundation chamber in which the second circulating water for cooling the cooling passage is flooded.
The alkaline solid reactant treatment system according to claim 1, wherein the third heat exchanger cools the second circulating water with a cooling medium. The alkaline solid reaction treatment system according to claim 12 or 13, wherein the cooling medium is a liquid. The alkaline solid reaction treatment system according to claim 12 or 13, wherein the cooling medium is a gas. The alkaline solid reactant treatment system according to any one of claims 1 to 15, wherein the conduit receives the exhaust gas that has undergone a carbonation reaction in the treatment apparatus as a return gas. The alkaline solid reaction product treatment system according to any one of claims 1 to 16, wherein the treatment device includes a cleaning device for spraying washing water for washing the alkaline solid reaction product. The processing device
The container body with the bottom and
A first chamber provided on the bottom of the container body to draw in the exhaust gas, and
A second chamber provided above the first chamber inside the container body and accommodating the alkaline solid reactant and the exhaust gas to undergo a carbonation reaction.
A partition wall provided inside the container body at intervals with respect to the bottom portion, and which has air permeability and water permeability and separates the first chamber and the second chamber.
The alkaline solid reaction product treatment system according to any one of claims 1 to 17. The alkaline solid reaction treatment system according to claim 18, wherein the partition wall includes a plurality of laminated plates.

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