JPH1172221A - Incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it unnecessary to replace a heat exchanger frequently and to make it possible to lower the temperature of exhaust gas discharged outside a system, to the utmost. SOLUTION: This incinerator is equipped with a heat accumulator 5 and also at least one heat accumulation type burner system 2 conducting combustion with an oxidizing agent of high temperature approximating to the temperature of exhaust gas, which is supplied by conducting the supply of the oxidizing agent and exhaustion of combustion gas alternately through the heat accumulator 5, is provided in a furnace body 1. Vent gas is supplied as the oxidizing agent to the heat accumulation type burner system 2 and fuel is combusted by the vent gas, while an odor component contained in this vent gas is thermally decomposed or burned. Meanwhile, the combustion gas produced is passed through the heat accumulator 5 to be of low temperature and discharged, while the vent gas is preheated to a high temperature approximating to the temperature of the exhaust gas by the heat released in the heat accumulator 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is included in a gas or a liquid discharged from a chemical plant, a food plant, a coating plant, and any other plants (collectively referred to as a chemical plant in the present specification). The present invention relates to an incinerator that incinerates or thermally decomposes odor components, toxic substances, and the like using combustion heat. More specifically, the present invention relates to an insulator capable of simultaneously treating an exhaust gas containing an odor component and a toxic substance and a waste liquid.

[0002]

2. Description of the Related Art As an insulator which incinerates or thermally decomposes odor components and toxic substances contained in a gas by combustion heat, the one shown in FIG. 10 is conventionally known. This insulator has a convection section 103 in an upper half of a furnace body 101 and a combustion reaction section 104 in a lower half. The convection section 103 is provided with a metal heat exchanger 105 so as to lower the temperature of the combustion gas generated in the combustion reaction section 104 to a temperature at which the combustion gas can be exhausted into the atmosphere. Heat exchanger 10
For example, water is supplied to 5 and the heat of the discharged combustion gas is converted into steam and collected. In addition, a vent gas discharged from a chemical plant or the like is injected around the flame formed by the burner 102 provided at the furnace bottom in the combustion reaction section 104 so as to be incinerated or thermally decomposed.
A large number of vent gas injection ports 109 are annularly arranged.
The vent gas is jetted in a tangential direction from the injection port 109 on the furnace peripheral wall, and supplied so as to form a swirling flow in which the vent gas is collected toward the center of the furnace. In addition, vent gas injection port 1
A required number of spray nozzles 106 for atomizing the waste liquid and spraying it toward the flame when the waste liquid needs to be processed are installed on the top of the nozzle 09. Further, above the spray nozzle 106, the exhausted combustion gas is supplied to the convection section 1
An injection port 110 for injecting cooling air for lowering the temperature to a level that the heat exchanger 105 can withstand is provided. Cooling air injection port 110 is vent gas injection port 1
Similarly to 09, cooling air is jetted from the furnace inner peripheral wall surface in a tangential direction. The burner 102 injects gaseous fuel and combustion air from a burner throat 113 on the furnace bottom 112 to form a flame in the combustion chamber 111. Numerals 107 and 108 in the drawing denote wind boxes, and 114 denotes an exhaust pipe.

[0003] According to the insulator having such a configuration, the vent gas is mixed with the flame / combustion gas formed by the burner 102 at the furnace bottom, so that the odor gas contained in the vent gas at a processing temperature of about 950 ° C, for example, toluene odor. Are thermally decomposed or incinerated. Further, a mist of the waste liquid is sprayed from the spray nozzle 106 toward the flame to be subjected to an evaporation treatment, and at the same time, an odor component contained in the waste liquid is also thermally decomposed. After that, the combustion gas after being used for the pyrolysis treatment or the incineration treatment is mixed with the cooling air injected from the injection port 110 to be reduced to a temperature that the heat exchanger can withstand before being introduced into the convection section 103. And
After the temperature is further reduced to a predetermined temperature, it is discharged into the atmosphere.

[0004]

However, if the gas temperature at the inlet to the heat exchanger is too high, heat cannot be recovered sufficiently and is discharged into the atmosphere at a high temperature. Energy use efficiency will be degraded.
For this reason, before introducing into the heat exchanger 105 of the convection section 103, there is a problem that the temperature must be sufficiently lowered by the cooling air, the heat energy is wasted wastefully, and the utilization efficiency of the heat energy is deteriorated. I have. Moreover, the temperature is below the acid dew point (3
When cooled to below (00 ° C.), corrosion of the heat exchanger proceeds rapidly. For this reason, according to the conventional insulator, since the heat exchanger is severely corroded and cannot be used in a relatively short period of time, the heat exchanger must be frequently stopped and the heat exchanger needs to be replaced, and the equipment operation rate decreases. Have a problem. Further, frequent replacement of the heat exchanger has a problem of increasing equipment maintenance cost. On the other hand, if the gas is discharged into the air at a relatively high temperature exceeding the acid dew point temperature (about 300 ° C.) at which heat recovery cannot be said to be sufficient, not only effective heat utilization is not performed, but also environmentally unfavorable.

It is an object of the present invention to provide an insulator which does not require frequent heat exchanger replacement. Another object of the present invention is to provide a system capable of extremely reducing the temperature of exhaust gas discharged to the outside of the system.

[0006]

In order to achieve the above object, an insulator of the present invention includes a heat storage element and alternately supplies an oxidant and discharges combustion gas through the heat storage element to thereby achieve a temperature close to an exhaust gas temperature. At least one regenerative burner system that supplies and burns a high-temperature oxidant is installed in the furnace body, and vent gas is supplied to the regenerative burner system as an oxidant, and fuel is burned with the vent gas to remove odor contained in the vent gas. While the components and the like are thermally decomposed or incinerated, the generated combustion gas is cooled to a low temperature through a regenerator and then discharged, and the vent gas is preheated to a high temperature close to the exhaust gas temperature by heat discarded in the regenerator.

Therefore, the combustion gas generated in the furnace is
The whole amount is taken out of the furnace through the heat storage body, and is not particularly problematic even if it is discharged to the atmosphere as it is.
The gas is exhausted after the temperature is lowered to a low temperature from about below ℃ to about room temperature. On the other hand, most of the sensible heat of the exhaust gas discarded by the heat storage element when passing through the heat storage element is returned to the furnace after being used again for high-temperature preheating of the vent gas as an oxidizing agent. The enthalpy of the high-temperature vent gas makes up most of the heat required to maintain the flame, while supplying the minimum amount of fuel corresponding to the heat to be replenished to maintain the processing temperature, thereby maintaining combustion. Is done. At this time, the vent gas containing the odorous component is preheated to a high temperature close to the processing temperature, in other words, a high temperature of about 700 to 1000 ° C. through the heat accumulator, so that the vent gas is injected into or near the flame. Even so, it does not lower the flame temperature at the ignition point. In addition, this temperature is higher than the auto-ignition temperature of the mixture of the oxidizer and the fuel. For this reason,
It is excellent in flame stability, and can activate the circulation in the furnace to average the temperature of the combustion gas and the processing atmosphere in the furnace. As a result, there is no danger of local overheating, the processing temperature in the insulator can be made more uniform, and a low-temperature portion that does not contribute to the processing is reduced, and a region where the desired processing temperature is increased as a whole is increased. Increasing the time makes it possible to incinerate or thermally decompose odor components more stably. Further, the combustion gas generated by the combustion of the processing gas is discharged through the regenerator of the regenerative burner system, and reheats the regenerator that has been used for preheating and has been cooled. This maintains a high temperature preheat.

[0008] Further, according to the second aspect of the present invention,
At least one regenerative burner system is provided in a furnace body that includes a heat storage element and alternately supplies an oxidant and discharges a combustion gas through the heat storage element to supply and burn a high-temperature oxidant close to the exhaust gas temperature. At the same time, a part of the combustion gas generated by the combustion of the vent gas is extracted to the outside of the combustion chamber through the other heat storage body, and a bypass flow for extracting the remaining combustion gas to the outside of the combustion chamber without passing through the heat storage body is formed. A waste liquid containing no odor component is sprayed and evaporated into the bypass flow, and the exhaust gas of the bypass flow is mixed with the exhaust gas discharged through the heat storage body before being discharged.

In this case, a part of the heat of the bypassed combustion gas is consumed for evaporating the waste liquid and the heat is removed, so that an increase in the equilibrium temperature is prevented. Therefore, the exhaust gas temperature can be lowered, and the thermal efficiency does not decrease.

[0010] Further, the insulator according to claim 3 is
At least one regenerative burner system is provided in a furnace body that includes a heat storage element and alternately supplies an oxidant and discharges a combustion gas through the heat storage element to supply and burn a high-temperature oxidant close to the exhaust gas temperature. At the same time, a part of the combustion gas generated by the combustion of the vent gas is extracted to the outside of the combustion chamber through the other heat storage body, and a bypass flow for extracting the remaining combustion gas to the outside of the combustion chamber without passing through the heat storage body is formed. A waste liquid containing an odor component is sprayed to the bypass flow to evaporate, and the exhaust gas of the bypass flow and new vent gas are supplied to the regenerative burner system as an oxidant, and the fuel is burned and not burned in the combustion chamber. A part of the combustion gas is discharged through the heat storage body of the burner.

In this case, not only the vent gas but also odor components and toxic substances contained in the waste liquid can be incinerated or thermally decomposed. That is, the waste liquid is evaporated by the heat of the bypass flow, becomes a vapor containing an odor component or a toxic substance, joins with the vent gas to be treated together with the bypass flow, and is supplied to the regenerative burner system. Then, it is preheated to a high temperature near the temperature of the exhaust gas by the regenerator and then supplied to the combustion chamber, and burns or thermally decomposes while staying in the combustion chamber and passes through the regenerator of the non-burning burner to the outside of the combustion chamber. Is discharged. At the same time, a part of the heat of the bypassed combustion gas is consumed for evaporating the waste liquid and is removed, thereby preventing the equilibrium temperature from rising. At this time, part of the waste liquid that has become vapor becomes drain due to recondensation, and this is extracted by a drain trap, and is returned to the treated waste liquid for reprocessing.

[0012] Further, according to a fourth aspect of the present invention, there is provided an oscillator comprising:
A vent gas high-temperature preheating supply system that has a pair of ports having a heat storage body and supplies a high-temperature vent gas close to the exhaust gas temperature into the furnace by alternately supplying the vent gas and discharging the treated gas through the heat storage body of the port. At least one system is installed in the furnace body, and a heat source for forming a processing temperature atmosphere for incinerating or thermally decomposing the vent gas is provided. Here, as a heat source, a normal burner that burns with air preheated to a relatively low temperature of about room temperature to about 300 ° C. is generally used. However, the present invention is not particularly limited to this, and an electric heater, a radiant tube burner, or the like is used. It is also possible.

[0013] In this case, the vent gas is preheated to a high temperature near the temperature of the exhaust gas, that is, a high temperature near the processing temperature by the heat of the furnace gas exhausted by using the heat storage body, and then supplied into the furnace to form a heat source. When the vent gas is exposed to the atmosphere to reach the processing temperature, the reaction starts at the same time as the vent gas is exposed to the atmosphere, and when discharged from the port that does not supply the vent gas, the residence time at the processing temperature sufficient to complete the reaction Is obtained.

[0014] Further, the insulator according to the fifth aspect is characterized in that:
At least one regenerative burner system is provided in a furnace body that includes a heat storage element and alternately supplies an oxidant and discharges a combustion gas through the heat storage element to supply and burn a high-temperature oxidant close to the exhaust gas temperature. A part of the combustion gas is extracted to the outside of the combustion chamber through the other heat storage body, and a bypass flow is formed to extract the remaining combustion gas to the outside of the combustion chamber without passing through the heat storage body to form an odor component in the bypass flow. Spray and evaporate the waste liquid containing the waste gas and supply the exhaust gas and residual odor components of this bypass flow together with the oxidizing agent to the regenerative burner system, burn it in the combustion chamber, and burn it through the regenerator of the burner that is not burning Some of the gas is exhausted.

[0015] In this case, odor components and toxic substances contained in the waste liquid can be incinerated or thermally decomposed. That is, the waste liquid is evaporated by the heat of the bypass flow, becomes a vapor containing an odor component and a toxic substance, joins the oxidant together with the bypass flow, and is supplied to the regenerative burner system. Then, it is preheated to a high temperature near the temperature of the exhaust gas by the regenerator and then supplied to the combustion chamber, and burns or thermally decomposes while staying in the combustion chamber and passes through the regenerator of the non-burning burner to the outside of the combustion chamber. Is discharged. At the same time, a part of the heat of the combustion gas that is bypassed is used to evaporate the waste liquid and is removed,
A rise in the equilibrium temperature is prevented. At this time, a part of the waste liquid which has become vapor becomes drain due to recondensation, which is extracted by a drain trap and refluxed into the processing waste liquid for reprocessing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on the preferred embodiment shown in the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to an insulator for treating only vent gas. This incinerator comprises a furnace body 1 and at least one set of regenerative burner systems 2 installed therein. Here, as the heat storage type burner system 2, it is preferable to use an alternate combustion type burner system in which two sets of burners are alternately burned. In this case, the incombustible flame due to the alternating combustion and the circulating airflow whose flow direction changes periodically promotes the improvement of the mixing property between the vent gas and the combustion gas in the furnace and the flattening (averaging) of the furnace temperature. The incineration or thermal decomposition of the odor component can be performed more efficiently in a wide range in the furnace, and the generation of a local high-temperature region can be suppressed to reduce NOx.

In this embodiment, the furnace body 1 is divided into an upper stage and a lower stage, and two burners 3 installed in each stage are provided.
By combining a, 3b, 4a, and 4b, a set of regenerative burner systems 2 in which the upper burners 3a and 3b and the lower burners 4a and 4b alternately burn and exhaust from the burners whose combustion is stopped are provided. Make up. Each burner 3
Each of a, 3b, 4a, and 4b has a heat storage element 5 directly connected to or attached to the heat storage element 5, and supplies the oxidant and discharges the combustion gas through the heat storage element 5.

Here, the upper burners 3a and 3b and the lower burners 4a and 4b are not particularly limited in the structure and the combustion system, but are, for example, shown in FIGS.
The structure shown in FIG. That is, the burner has five burner throats 6a,..., 6e, and is provided so as to distribute bend cass, which is an oxidizing agent, that has passed through the heat storage element 5 and divide it into five jets.
A fuel nozzle 7 and a pilot burner 8 are provided in a central burner throat 6a of the five burner throats, and a flame is formed in front of the central burner throat 6a so that vent gas flows around the flame. . Four burner throats 6b around the vent gas spouting,
, 6e are formed slightly obliquely inward, and are provided so that the vent gas collides with the flame in the combustion chamber 9. The fuel injection amount is set so that the air ratio is in the range of 1.5 to 2 with respect to the vent gas flowing through the central burner throat 6a for stable combustion. The flow rate of the vent gas injected from each burner throat 6a,..., 6e is not particularly limited, and may be a normal speed, for example, about 20 to 30 m / s.
It is preferable to inject the fuel into the combustion chamber 9 at a flow rate of 100 m / s or more in order to increase the fluidity of the circulating gas and make the processing temperature distribution uniform. In this case, the circulation in the combustion chamber 9 becomes active, the mixture of the combustion gas and the vent gas becomes active, and the temperature distribution in the furnace becomes uniform without generating local high-temperature or low-temperature regions, thereby suppressing the generation of NOx. However, incineration or thermal decomposition of odor components can be stably continued.

Upper burner 3a, 3b and lower burner 4
a and 4b are arranged symmetrically as shown in FIGS. 3A and 3B so that the combustion gas forms a swirling flow in the combustion chamber 9 and is discharged from the other stopped burner. Is provided. Upper burner 3a, 3b and lower burner 4
As shown in FIGS. 5 and 2, the upper and lower burners 3a and 3b respectively connect the air supply duct 12 and the exhaust duct 13 connected to the air supply blower 10 and the exhaust blower 11, respectively. Branch duct 14 and lower burners 4a, 4b
Gate valves 18, 19, 2 each of which is connected to a branch duct 15, which is connected to each other, via branch ducts 16, 17, and is composed of an electromagnetic valve provided in each branch duct 16, 17.
Opening and closing of 0 and 21 enables the upper or lower burner to be selectively connected to the air supply blower 10 or the exhaust blower 11.

The heat storage body 5 is for recovering and storing the sensible heat of the combustion gas, and is generally made of a material such as ceramics which does not react with the combustion gas or the processing gas or does not adversely affect the combustion air. Use is preferred. In addition, the heat storage element 5
It is preferable to use a material having a large heat capacity and a high durability for a relatively low pressure loss, for example, a cylindrical body having many honeycomb-shaped cell holes. Therefore, in this embodiment,
Honeycomb-shaped regenerators manufactured by extrusion using ceramics such as cordierite and mullite are employed, but are not particularly limited thereto.For example, metals such as heat-resistant steel or composites of ceramics and metals body (porous metal melted into the pores of the ceramics having a skeleton is spontaneous infiltration, the part of the metal oxide or by nitrided Ceramization, Al ₂ O ₃ -Al complex fill the complete pore, SiC-Al ₂
An O ₃ -Al composite or the like can also be used as a heat storage body having a honeycomb shape or other shapes. still,
The honeycomb shape originally means a hexagonal cell (hole), but in the present specification, includes not only an original hexagon but also an infinite number of square or triangular cells. Alternatively, a honeycomb-shaped heat storage body may be obtained by bundling tubes or the like without forming them integrally. Also, the shape of the heat storage body is not particularly limited to the honeycomb shape, and a flat or corrugated heat storage material is radially arranged in a cylindrical casing, or a fluid passes in a pipe-shaped heat storage material in the axial direction. As described above, the casing may be filled in a cylindrical casing. In addition, a cylindrical casing which is formed by partitioning into two chambers in the circumferential direction and through which fluid can pass in the axial direction is prepared. Each chamber has a spherical, short tube, short rod, strip, nugget, It may be configured by filling a mass of a heat storage material such as a net.

The furnace body 1 is not particularly limited in the present invention, but is usually made of a refractory, such as a refractory brick. And, in the case of this embodiment,
Work areas 22 are provided in the upper and lower tiers, respectively.

With the above-described structure, vent gas incineration or thermal decomposition is performed, for example, as follows.

First, a pair of burners 3a, 3b and 4a,
4b is supplied with a general fuel such as LPG and air, and is alternately burned. Then, the combustion gas is exhausted from the stopped burners to heat the heat storage bodies 5 and the furnace body 1. Then, when these are heated to a predetermined temperature, the vent gas is supplied as an oxidizing agent.

That is, while a vent gas and a fuel are alternately supplied to a pair of burners 3a, 3b and 4a, 4b constituting a pair of regenerative burner systems 2 to burn them alternately, the burner in which the combustion gas is stopped is stopped. Then, the air is exhausted through the heat storage 5 attached to the air. For example, in the state shown in FIG. 5, by closing the electromagnetic valves 19 and 21 and opening the electromagnetic valves 18 and 20, processing gas is supplied to the burners 3a and 3b through the regenerator 5 and injected into the central burner throat 6a. It is mixed with fuel and burned. This electromagnetic valve 18,1
In opening and closing 9, 20, and 21, it is necessary to take care to prevent the vent gas from short-circuiting to the exhaust system by taking an appropriate lead time. At the same time, the vent gas injected from the four surrounding burner throats 6b,..., 6e comes into contact with the flame in the combustion chamber 9. Since the flame and vent gas jets injected from each burner throat are tangential to the circular combustion chamber peripheral wall, they flow toward the lower burners 4a and 4b while forming a swirling flow. Then, the combustion gas is extracted from the burners 4 a and 4 b through the heat storage body 5 to the exhaust duct 13 and exhausted. This switching of combustion is switched in a short time, for example, as short as possible within 20 to 30 seconds in order to maximize the temperature efficiency of heat exchange, and the heat of exhaust gas preheats the vent gas to a high temperature by direct heat exchange. For example, 700 ° C to 1000
Preheated to a high temperature of ° C. Therefore, it burns stably.

In the combustion chamber 9, a vent gas containing an odor component or the like is combusted by a non-standing flame due to alternate combustion, or thermally decomposed by combustion heat. Here, since the vent gas is preheated by the heat storage unit 5 and has a high temperature, for example, 700 to 1000 ° C. close to the temperature of the furnace atmosphere (exhaust gas) which has been exhausted, that is, the furnace gas that has reached the processing temperature, the vent gas or the vent gas When the temperature of the mixed gas of the fuel gas and the circulating gas becomes close to or higher than the ignition temperature of the fuel, an increase in the reaction rate and a drastic expansion of the flammability limit greatly contribute to the stabilization of combustion, and the fuel is satisfactorily burned. Therefore, even if the vent gas collides with the flame, the temperature at the ignition point is not so lowered and the flame is not blown out. On the other hand, the combustion gas is discharged from the burner connected to the exhaust duct 13. At this time, the combustion exhaust gas (exhaust gas) after being used for incineration or thermal decomposition of the odor component is recovered by the heat storage 5 and then exhausted through the exhaust blower 11. The odor components in the vent gas are completely incinerated or thermally decomposed at the treatment temperature where the temperature distribution in the furnace is uniformed by the unsteady flame due to the alternating combustion and the strong circulating flow by the high-speed jet. Since generation is suppressed, generation of NOx is also small. Therefore, the exhaust gas is in a clean state.

FIG. 6 shows another embodiment. The insulator of this embodiment has a drain collection hole 23 at the bottom of the furnace body 1.
And a drain recovery container 24 is disposed.
The drain recondensed in the drain recovery container is recovered from the bottom of the drain recovery container via a drain trap. The exhaust blower 11 is connected to the drain recovery container 24, and is provided so that the combustion gas extracted into the drain recovery container 24 is mixed with the exhaust gas passing through the heat storage unit 5 of the burner and then discharged to the atmosphere or the like. . A required number of, for example, two or more waste liquid injection nozzles 25 for spraying waste liquid are arranged on the peripheral wall surface of the furnace body 1 below the regenerative burner system 2. Then, a waste liquid containing no odor component or the like is injected toward the center of the combustion chamber 9 toward the bypass flow 26.

That is, a bypass flow 26 is formed in which a part of the combustion gas generated by the combustion of the vent gas is drawn from the drain recovery hole 23 at the bottom of the combustion chamber 9 to the drain recovery container 24 without passing through the heat storage body 5 of the burner. A waste liquid containing no odor component in the bypass flow 26 is sprayed from a waste liquid injection nozzle 25 to evaporate, and the exhaust gas of the bypass flow 26 is attracted and exhausted to the exhaust blower 11 through the drain recovery container 24. Here, the exhaust gas taken out from the drain recovery container 24 is mixed with the exhaust gas that has passed through the heat storage element 5 of the burner and then discharged.

In this case, since a part of the heat of the bypassed combustion gas is consumed for evaporating the waste liquid and the heat is removed, an increase in the equilibrium temperature is prevented. Therefore, the exhaust gas temperature can be lowered, and the thermal efficiency does not decrease. The drain generated by recondensing in the drain recovery container is extracted by a drain trap, merged into the processing waste liquid, and re-injected from the waste liquid injection nozzle 25.

That is, the amount of combustion gas generated by the combustion is about 1.1 times the amount of combustion air, in other words, about 1.1 times that of the vent gas, and the specific heat of the combustion exhaust gas is about 1.1 times that of the combustion air.
Therefore, the ratio of the product of the specific heat and the flow rate of each of the exhaust gas and the vent gas, that is, CgGg / CaGa is about 1.2.
Becomes

[CgGg / CaGa ≒ 1.2] Therefore, when the entire amount of exhaust gas exchanges heat with the vent gas, the temperature difference between the inlet and the outlet of the exhaust gas is about 20% smaller than the temperature difference between the outlet and the inlet of the vent gas. However, the temperature of the exhaust gas reduced by the heat exchange cannot be reduced below a certain limit value.

[Tgh−tgl ≒ (tah−
tal) /1.2] This means that, for example, the exhaust gas having an inlet temperature of 1200 ° C. and the vent gas having an inlet temperature of 20 ° C. are heat-exchanged, and the heat exchange efficiency (temperature efficiency) is reduced to 100% (transfer efficiency). (Infinite thermal area) and set the air outlet temperature to 1200 °
Even if the temperature is raised to ℃, the outlet temperature of the exhaust gas is 217 ℃
Indicates that it cannot be lowered.

[Tgl = 1200− (1200-2)
0) /1.2≒217] Here, when a part of the heat of the combustion gas generated in the heat storage burner system 2 is used for evaporating the waste liquid to remove the heat and exchange heat between the remaining exhaust gas and the vent gas, The ratio of the product of the specific heat and the flow rate, that is, CgGg / CaGa, becomes smaller than 1.2 when heat exchange is performed with the entire amount of exhaust gas, and the outlet exhaust gas temperature after heat exchange becomes lower than when heat exchange is performed with the entire amount of exhaust gas.
This temperature further decreases as the amount discharged out of the combustion chamber 9 increases, and approaches the vent gas inlet temperature (it does not become lower than the vent gas inlet temperature).

Therefore, according to the present embodiment, the heat is removed from the combustion chamber 9 by the heat storage bodies 5 of the heat storage burners 3a, 3b, 4a, and 4b, and the exhaust gas is cooled by the exhaust gas and the waste liquid spray removes the heat to reduce the temperature. The exhaust gas is merged and released to the atmosphere. As a result, the exhaust gas temperature is minimized at the appropriate bypass point, and a more efficient insulator can be obtained. In addition, according to this embodiment, since the spray injection of the waste liquid is performed on the bypass flow 26 under the heat storage type burner system 2, the mist does not flow into the heat storage body 5 and the heat storage body 5 does not crack. .

FIG. 7 shows still another embodiment. The insulator of this embodiment is a plant that intends to treat a waste liquid containing an odor component together with a vent gas.
6 connects the drain recovery container 24 for extracting the bypass flow 26 and the air supply blower 10 in the insinelator of FIG. 6, mixes a part of the combustion gas extracted to the drain recovery container 24 with a new vent gas, and It is supplied to 3a, 3b or 4a, 4b and reused as an oxidizing agent. That is, the bypass flow 2
The exhaust gas of 6 and the new vent gas are supplied to the regenerative burner system 2 as an oxidant, and are burned as fuel in the combustion chamber 9 and a part of the combustion gas is discharged through the regenerator 5 of the burner that is not burning. I have to. In this case, the waste liquid is evaporated by the heat of the bypass flow 26, combined with the vent gas as a vapor containing an odor component and a toxic substance together with the bypass flow, returned to the combustion chamber 9, and incinerated or thermally decomposed in the combustion chamber 9. it can. The drain generated by the recondensation in the drain recovery container is extracted by the drain trap, merges with the processing waste liquid, and is again injected from the waste liquid injection nozzle 25.

According to this embodiment, since the spraying of the waste liquid is performed on the bypass flow 26 under the regenerative burner system 2, the mist may flow into the regenerator 5 and cause the regenerator 5 to crack. Absent. Here, it is sufficient that the bypass flow 26 has enough heat to evaporate the waste liquid, and since the remaining odor components and the like are returned to the combustion chamber 9 together with the vent gas and incinerated or thermally decomposed, a large amount of heat is consumed. do not need.

Further, although not shown, in the embodiment of FIG. 7, it is possible to treat only the waste liquid containing odor components without treating the vent gas. in this case,
Instead of the vent gas, an oxidizing agent (usually air at normal temperature, but is not particularly limited thereto, and oxygen or oxygen-enriched air may be used if necessary) to the regenerative burner system 2 I am trying to supply. Therefore, the waste liquid sprayed from the waste liquid injection nozzle 25 is evaporated by the heat of the bypass flow 26, becomes vapor containing odor components and the like, and is taken out together with the bypass flow from the drain recovery hole 23 at the bottom of the furnace body 1 to the drain recovery container 24. The heat is combined with the oxidant and supplied to the regenerative burner system 2. The heat accumulator 5 is preheated to a high temperature near the temperature of the exhaust gas and then supplied to the combustion chamber 9. The heat accumulator 5 of the burner which is not burned due to combustion or thermal decomposition while staying in the combustion chamber 9. Through the combustion chamber 9. At this time, a part of the heat of the bypassed combustion gas is consumed for evaporating the waste liquid and the heat is removed, so that an increase in the equilibrium temperature is prevented. Drain generated by recondensation in the drain recovery container is extracted by the drain trap, merges with the processing waste liquid, and is re-injected from the waste liquid injection nozzle.

The above embodiment is a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. For example, in the case of the present embodiment, the processing gas is an exhaust gas containing an odor component discharged from a chemical plant or the like, but is not particularly limited thereto, and may be other gases such as a solvent gas discharged from a coating machine. Biogas, ultra-low calorific gas, and odorous gas containing almost no flammable components can be treated. Also, there is no particular limitation on the degree of rotation of the processing gas nozzle, the number of holes of the injection nozzle, the structure, and the like.

The regenerative burner system 2 is not particularly limited to a type in which a pair of burners are alternately burned. The burners to be burned are fixed, and the regenerator itself is used as an exhaust system and a vent gas supply system (combustion air supply system) or a preheater. The structure may be such that the flow between the exhaust gas and the vent gas supply system (combustion air supply system) relative to the heat storage body is switched by rotating between the mixed gas supply system and the regenerator. In this embodiment, a combination of four solenoid valves is used as a flow path switching unit for selectively connecting a supply system of combustion air, a processing gas or a premixed gas, and a combustion gas exhaust system to a heat storage unit. 4 illustrates a four-way valve. For example, as shown in FIG. 9, each duct of the supply system and the exhaust system connected to the same burner so that the unprocessed gas and the processed gas do not pass through the insulator and are short-passed and not discharged unprocessed. Are controlled not to open at the same time. However, the present invention is not particularly limited to this, and another type of flow path switching valve, for example, a flow path switching device as disclosed in Japanese Patent Application No. 4-216473 proposed by the present applicant may be used.

Further, the heat source of the insulator is not limited to the regenerative burner system 2 but may be a general diffusion burner, a premix burner, an electric heater, a radiant tube burner, or the like. For example, as shown in FIG. 8, at least one vent gas high-temperature preheating supply system 28 is installed in the furnace body 1 of the insulator to supply the vent gas by preheating it to a high temperature. The vent gas high-temperature preheating supply system 28 has a pair of ports 27, 27 provided with the heat storage bodies 5, and the heat storage bodies 5, 5 of the ports 27, 27.
The supply of the vent gas and the discharge of the gas in the furnace are performed alternately, so that a high-temperature vent gas close to the exhaust gas temperature is supplied to the combustion chamber 9. At the bottom of the furnace 1, a diffusion burner 29 is provided as a heat source for forming a processing temperature atmosphere for incinerating or thermally decomposing the vent gas. Then, a flame is injected from the furnace bottom to form an atmosphere at a processing temperature. Therefore, one port 2
When the vent gas is injected into the processing temperature atmosphere from 7, the vent gas is preheated to a high temperature near the exhaust gas temperature, that is, a high temperature near the processing temperature by the heat of the furnace gas exhausted using the regenerator 5. From the furnace and into the combustion chamber 9. The vent gas completes the reaction before being exposed to the atmosphere reaching the processing temperature formed by the heat source / burner 29 and discharged from the other port 27.

[0041]

Embodiment 1 The same vent gas (air having toluene odor, toluene has a calorific value of 0) was used between the insulator of the present invention of the embodiment shown in FIG. 1 and the conventional insulator shown in FIG.
The following Table 1 shows a comparison of the treatments of a very small amount that can be treated as).

[0042]

[Table 1] However, the dissipation heat was set at 80,000 Kcal / h. Further, the oxidizing agent of the conventional insulator was the atmosphere (air), and the oxidizing agent of the present invention used a vent gas.

As a result, the inventor of the present invention shown in FIG. 1 requires that about 22% of the heat of combustion is sufficient to treat the same vent gas under the same conditions under the same amount.

[0044]

Example 2 Table 2 shows the results of experiments on changes in the amount of wastewater incineration, required combustion heat, vent gas preheating temperature, etc. when the bypass ratio was changed in the insulator of the second embodiment shown in FIG.

[0045]

[Table 2] However, the dissipation heat was set at 80,000 Kcal / h.

As is clear from these results, according to the present embodiment, even if more than half of the combustion gas is bypassed (bypass ratio is 0.6) and a large amount of waste liquid is evaporated, half of the combustion of the conventional insulator is reduced. The same amount of vent gas can be treated with heat. The appropriate bypass ratio for minimizing the exhaust temperature at the junction where exhaust is integrated (maximizing the thermal efficiency) is 0.1.
Although it is around 4, it is 42 to process 830 kg / h waste liquid.
10,000 kcal / h (approximately 72% increase without waste liquid treatment) requires extra combustion heat, while a bypass rate of 0.2 requires only 150,000 to treat approximately half of 410 kg / h waste liquid. kc
Since only an extra amount of combustion heat of al / h (about 25% increase when no waste liquid treatment is performed) is required, it can be said that the bypass ratio for improving the thermal efficiency without increasing the amount of combustion heat so much is about 0.2. .

[0047]

Example 3 Table 3 shows the results of experiments conducted on the incinerator of the third embodiment of the embodiment shown in FIG. 7 with respect to changes in the amount of wastewater incineration, the amount of vent gas incineration, required combustion heat, and vent gas preheating temperature when the bypass ratio was changed. .

[0048]

[Table 3] However, the dissipation heat was set at 80,000 Kcal / h. Further, the waste water was vaporized at 250 ° C. and then circulated to a vent gas.

From this result, it can be said that the same result as in the second embodiment is obtained. However, it can be said that the bypass ratio at which the vent gas preheating temperature is not so much reduced as compared with the case where the bypass is not bypassed is about 0.2. Of course, the vent gas preheating temperature itself can be increased by increasing the processing temperature. However, increasing the processing temperature more than necessary is not preferable because it involves generation of NOx and an increase in the amount of combustion. In the case where only the waste liquid containing the odor component or the like is treated without treating the vent gas as in the embodiment shown in FIG. 8, the bypass ratio is preferably set to about 0.4. In this case, the exhaust gas temperature is the lowest, the thermal efficiency is good, and the required increase in the amount of combustion heat is small for the increased amount of treated wastewater.

[0050]

As is apparent from the above description, according to the incinerator according to any one of the first to fifth aspects, the combustion exhaust gas used for incineration or thermal decomposition of vent gas containing an odor component, etc. When passing, most of the sensible heat is collected in a heat storage body, cooled to a low temperature, and then exhausted to the atmosphere.
The equipment can be made compact and the durability can be improved, and the cost can be reduced.

Further, according to the first to fifth aspects of the present invention, when the vent gas or the oxidizing agent containing the odor component is supplied into the insulator, it is preheated to a high temperature close to the temperature of the furnace gas exhausted through the heat accumulator. Since it is supplied in a vacuum, it can be set freely, including raising the vent gas processing temperature without lowering the thermal efficiency.

According to the first to fifth aspects of the present invention, the oxidizing agent containing the vent gas or the odorous component is supplied after being preheated to a high temperature close to the processing temperature, so that the circulation in the furnace is activated and the combustion in the furnace is performed. The temperature of the gas / processing atmosphere can be averaged. As a result, NOx
Since there is no danger of local overheating which causes the occurrence of processing, the processing temperature in the insulator can be made more uniform, and a low-temperature portion which does not contribute to the processing is reduced, and the region where the desired processing temperature is increased as a whole, so that the processing temperature is reduced. By increasing the high-temperature residence time, incineration or thermal decomposition of odor components and the like can be performed more stably, and downsizing can be performed for the same throughput. In particular, the alternating combustion in the insulator or the alternate ejection of vent gas promotes the improvement of the mixing property between the atmosphere gas and the vent gas in the insulator and the flattening (averaging) of the processing temperature, and the reduction of odor components in a wide range of the insulator. Incineration or thermal decomposition can be performed efficiently and NOx can be reduced.

Further, in the case of the insulator according to the second aspect, since a part of the heat of the bypassed combustion gas is consumed for evaporating the waste liquid and the heat is removed, an increase in the equilibrium temperature is prevented, so that the exhaust gas is exhausted. The temperature can be lower and the thermal efficiency is higher.

According to the third aspect of the present invention, not only the vent gas but also odor components and toxic substances contained in the waste liquid can be incinerated or thermally decomposed, and a part of the bypassed combustion gas can be burned. Since the heat of the waste liquid is consumed for evaporating the waste liquid and the heat is removed, an increase in the equilibrium temperature is prevented, and the thermal efficiency is increased.

Further, according to the fourth aspect of the present invention, the vent gas is supplied to the furnace after preheating to a high temperature near the temperature of the furnace gas exhausted by using the heat storage body, that is, a high temperature near the processing temperature. When the vent gas is exposed to the atmosphere and reaches the processing temperature, the reaction starts at the same time as the vent gas is exposed to the atmosphere, and when discharged from the port that does not supply the vent gas, the residence time at the processing temperature sufficient to complete the reaction And the combustion or thermal decomposition of the odorous component can be surely completed.

According to the fifth aspect of the present invention, the water in the waste liquid is evaporated to extract odor components and toxic substances contained in the waste liquid, and the extracted odor components and toxic substances are refluxed to the combustion chamber and then incinerated or thermally decomposed. Therefore, the odor component in the waste liquid can be treated, and a part of the heat of the combustion gas is consumed for evaporating the waste liquid and the heat is removed, thereby preventing an increase in the equilibrium temperature and increasing the thermal efficiency.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing one embodiment of an insulator of the present invention.

FIG. 2 is a perspective view showing an appearance of the insulator.

3A and 3B are cross-sectional views of the same insulator, wherein FIG. 3A shows the vicinity of an upper burner, and FIG. 3B shows the vicinity of a lower burner.

4A and 4B are views showing one embodiment of the burner, wherein FIG. 4A is a central cross-sectional view of the burner, FIG. 4B is a front view of the burner, and FIG.
FIG. 2 is a central vertical sectional view of the burner.

FIG. 5 is a piping diagram of the insulator of FIG. 1;

FIG. 6 is a central longitudinal sectional view showing another embodiment of the insulator of the present invention.

FIG. 7 is a central longitudinal sectional view showing still another embodiment of the insulator of the present invention.

FIG. 8 is a central longitudinal sectional view showing still another embodiment of the insulator of the present invention.

FIG. 9A is a perspective view showing an example of an insulator according to the present invention, and FIG. 9B is a gas switching timing chart of the same apparatus.

FIG. 10 is a central longitudinal sectional view showing an example of a conventional insulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace body 2 Thermal storage type burner system 3a, 3b, 4a, 4b One set of burners 5 Thermal storage body 9 Combustion chamber 23 Drain recovery hole 24 Drain recovery container 25 Waste liquid injection nozzle 26 Bypass flow 27 A pair of ports 28 Vent gas high temperature preheating supply system 29 Burner as heat source

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F23L 15/02 F23L 15/02

Claims (5)

[Claims] 1. An incinerator for incinerating or thermally decomposing a vent gas containing an odor component or the like, comprising a heat accumulator and alternately supplying an oxidant and discharging a combustion gas through the heat accumulator to obtain a high-temperature exhaust gas close to the exhaust gas temperature. At least one regenerative burner system for supplying and burning an oxidant is installed in the furnace body, and the vent gas is supplied to the regenerative burner system as an oxidant, and fuel is burned by the vent gas and included in the vent gas. While thermal decomposition or incineration of odor components and the like, the generated combustion gas is cooled to a low temperature through the regenerator and discharged, and the vent gas is preheated to a high temperature close to the exhaust gas temperature with heat discarded in the regenerator. Insulator to do. 2. An incinerator for incinerating or thermally decomposing a vent gas containing an odor component, comprising a heat accumulator and alternately supplying an oxidant and discharging a combustion gas through the heat accumulator to achieve high-temperature oxidation close to the exhaust gas temperature. At least one regenerative burner system for supplying and burning the agent is installed in the furnace body, and a part of the combustion gas generated by the combustion of the vent gas is extracted to the outside of the combustion chamber via the other regenerator while the remaining combustion gas is removed. Forming a bypass flow that draws outside the combustion chamber without passing through the heat storage body, sprays and evaporates waste liquid containing no odor component in the bypass flow, and discharges exhaust gas of the bypass flow through the heat storage body. An incinerator characterized by mixing and discharging. 3. An incinerator for incinerating or thermally decomposing a vent gas containing an odorous component, comprising a heat storage unit and alternately supplying an oxidant and discharging combustion gas through the heat storage unit to thereby perform high-temperature oxidation close to the exhaust gas temperature. At least one regenerative burner system for supplying and burning the agent is installed in the furnace body, and a part of the combustion gas generated by the combustion of the vent gas is extracted to the outside of the combustion chamber via the other regenerator while the remaining combustion gas is removed. A recirculation type burner system, wherein a bypass flow is drawn out of the combustion chamber without passing through the regenerator, a waste liquid containing an odor component is sprayed on the bypass flow to evaporate, and the exhaust gas and new vent gas of the bypass flow are renewed in the regenerative burner system. To the oxidizing agent,
An incinerator characterized in that fuel is burned in a combustion chamber and a part of combustion gas is discharged through the heat storage body of a burner that is not burning. 4. An incinerator for incinerating or thermally decomposing a vent gas containing an odor component or the like, having a pair of ports provided with a heat storage body, and alternately supplying the vent gas and discharging the gas in the furnace through the heat storage body of the port. At least one vent gas high-temperature preheating supply system for supplying a high-temperature vent gas close to the temperature of the exhaust gas to the combustion chamber is provided in the furnace body, and a heat source for forming a treatment temperature atmosphere for incinerating or thermally decomposing the vent gas is provided. Insulator featured. 5. An incinerator for incinerating or thermally decomposing a waste liquid containing an odorous component, comprising a heat storage unit, and alternately supplying an oxidant and discharging combustion gas through the heat storage unit to thereby achieve high-temperature oxidation close to the exhaust gas temperature. At least one regenerative burner system for supplying and burning the agent is installed in the furnace body, and a part of the combustion gas is extracted to the outside of the combustion chamber via the other regenerator while the remaining combustion gas is passed through the regenerator. A bypass flow that is drawn out of the combustion chamber without spraying, sprays and evaporates a waste liquid containing an odor component into the bypass flow, and supplies exhaust gas and residual odor component of the bypass flow together with an oxidizing agent to the regenerative burner system. And burning a part of the combustion gas through the regenerator of the burner which is burned in the combustion chamber and not burned. Insulator characterized by the above.