KR101548635B1 - APPARATUS for recovering waste heat of flue gas and reducing plume - Google Patents

Abstract

The present invention relates to an apparatus for reducing white lead and recovering waste heat of flue gas. More specifically, according to an embodiment of the present invention, provided is the apparatus for reducing white lead and recovering waste heat of flue gas, comprising: a main body including a first injection nozzle for injecting a first aqueous solution to flue gas supplied inside, and a second injection nozzle for injecting a second aqueous solution to the flue gas; a first circulation line for supplying an aqueous solution which pools in the bottom of the main body to the first injection nozzle; a second circulation line for supplying the aqueous solution collected in a central hopper supplied to the lower side of the second injection nozzle to the second injection nozzle; a first supply line for supplying a first aqueous solution stored in a first storage tank to the first circulation line; a second supply line for supplying a second aqueous solution stored in a second storage tank to the second circulation line; a water supply line for receiving water from the outside; and a heat exchanger provided on the second circulation line and the water supply line for exchanging heat between water flowing in the water supply line and the second aqueous solution flowing in the second circulation line. In the first aqueous solution and the second aqueous solution, chemicals for adsorbing contaminants and moisture contained in the flue gas are contained.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a flue gas desulfurization apparatus,

The present invention relates to flue gas waste heat recovery and white smoke reduction equipment.

Various power plants, incinerators, metal melting furnaces, boilers, and wet desulfurization facilities include combustion equipment such as gas turbines and boilers that generate heat by using fuel and generate electricity by using generated heat.

Such a combustion system generates exhaust gas containing a high concentration of pollutants. In order to remove pollutants contained in the exhaust gas, an absorption tower or a wet type dust collector is generally used.

The wet type dust collecting apparatus is a device for removing contaminants in the exhaust gas by spraying water at a high temperature exhaust gas. Flue gas discharged from the wet type dust collecting apparatus is in a state of high temperature and high humidity, that is, Lt; / RTI >

The flue gas discharged through the stack is discharged in the form of white smoke, which is white smoke because it contains saturated water. The discharged flue gas usually has a temperature of 60 to 200 캜, and when it comes into contact with the external cold air, the saturated water in the flue gas condenses and falls.

However, since various pollutants are contained in the flue gas, the moisture that the flue gas condenses and falls contains a large amount of harmful substances to the human body, which causes harm to the human body and causes pollution of the environment.

R & D is being actively developed to reduce the white smoke, which is the cause of environmental pollution, to remove the pollutants contained in the flue gas, and to absorb the latent heat and moisture of the flue gas for recycling.

An embodiment of the present invention is to provide a device for recovering waste gas heat and a device for effectively reducing the white smoke caused by flue gas generated in a combustion facility and effectively removing contaminants.

The present invention also provides a flue gas waste heat recovering apparatus and a white smoke reducing apparatus capable of recovering latent heat of a combustion facility for discharging flue gas to enhance energy efficiency.

According to an aspect of the present invention, there is provided a fuel cell system comprising: a main body including a first injection nozzle for injecting a first aqueous solution into a flue gas supplied to the inside; and a second injection nozzle for injecting a second aqueous solution into the flue gas; A first circulation line for supplying an aqueous solution having a high concentration to a bottom of the main body to the first injection nozzle; A second circulation line for supplying an aqueous solution collected in a central hopper provided below the second injection nozzle to the second injection nozzle; A first supply line for supplying the first aqueous solution stored in the first storage tank to the first circulation line; A second supply line for supplying the second aqueous solution stored in the second storage tank to the second circulation line; A water supply line to which water is supplied from outside; And a heat exchanger provided on the second circulation line and the water supply line for causing heat exchange between the second aqueous solution flowing through the second circulation line and the water flowing in the water supply line, The second aqueous solution may be provided with a flue gas waste heat recovery and white smoke reduction device including a pollutant contained in the flue gas and a chemical adsorbing moisture.

The main body may further include: a plasma filter for collecting water vapor and contaminants contained in the flue gas; And a packing formed with a plurality of voids through which the flue gas is passed, the flue gas waste heat recovery and white smoke reduction apparatus may be provided.

The main body may further include a HEPA filter provided at an upper portion of the main body and collecting water vapor and contaminants contained in the flue gas.

Further, the flue gas is supplied to the lower portion of the main body, the first injection nozzle is provided below the second injection nozzle, and the central hopper is disposed between the first injection nozzle and the second injection nozzle Wherein the packing is provided as one layer between the second injection nozzle and the central hopper and the flue gas waste heat recovery and the flue gas heat recovery are provided on the lower side of the first injection nozzle, A white smoke abatement device can be provided.

Further comprising a reflux line which is branched from the downstream side of the heat exchanger on the second circulation line and connected to the upstream side of the heat exchanger on the second circulation line, the second aqueous solution having passed through the heat exchanger flows through the reflux line A flue gas waste heat recovery apparatus and a white smoke reducing apparatus selectively returned to the upstream side of the heat exchanger on the second circulation line may be provided.

The second circulation line includes a temperature sensor provided on the upstream side of the heat exchanger to measure the temperature of the second aqueous solution, and the temperature sensor is disposed on the downstream side of the point where the reflux line is connected A flue gas waste heat recovery and a white smoke reduction device may be provided.

The control unit may further include a control unit for controlling the opening and closing valves of the second circulation line, the second supply line, and the return line, wherein the control unit controls the temperature of the second aqueous solution measured by the temperature sensor The second circulation line is closed and the second supply line is opened to supply the second aqueous solution from the second storage tank to the second injection nozzle, and the reflux line is opened to perform the heat exchange A flue gas desulfurization recovery apparatus and a flue gas desulfurization apparatus for controlling the second aqueous solution discharged from the flue gas to flow through the reflux line may be provided.

At least one of the first circulation line and the second circulation line includes a separation tank, and a decompression separator for decompressing the aqueous solution by the decompression valve to lower the boiling point of the aqueous solution to separate the water contained in the aqueous solution A flue gas heat recovery and a white smoke reduction device may be provided.

The at least one of the first circulation line and the second circulation line may include a filter and a cyclone and may be provided with a flue gas waste heat recovery and white smoke reduction device in which contaminants of the aqueous solution are removed by the filter and the cyclone have.

According to another aspect of the present invention, there is provided a fuel cell system comprising: a main body including a first injection nozzle for injecting a first aqueous solution into a flue gas supplied to the inside; and a second injection nozzle for injecting a second aqueous solution into the flue gas; A first circulation line for supplying an aqueous solution having a high concentration to a bottom of the main body to the first injection nozzle; A second circulation line for supplying an aqueous solution collected in a central hopper provided below the second injection nozzle to the second injection nozzle; A first supply line for injecting the first aqueous solution stored in the first storage tank into the first circulation line; A second supply line for supplying the second aqueous solution stored in the second storage tank to the second circulation line; A water supply line to which water is supplied from outside; A first heat exchanger provided on the second circulation line and the water supply line to cause heat exchange between the second aqueous solution flowing through the second circulation line and the water flowing in the water supply line; And a second heat exchanger provided on the first circulation line and the water supply line for causing heat exchange between the first aqueous solution flowing through the first circulation line and the water flowing in the water supply line, And the second aqueous solution may contain a pollutant contained in the flue gas and a chemical that adsorbs moisture, and may be provided with a flue gas waste heat recovery and white smoke reduction device.

The first aqueous solution and the second aqueous solution may contain sodium hydroxide (NaOH), calcium nitrate (Ca (NO3) 2), ammonium nitrate (NH4NO3), ammonium sulfate ((NH4) 2SO3), barium perchlorate ) 2), potassium hydrogencarbonate (KHCO 3), sodium nitrate (NaNO 3), sodium chlorate (NAClO 3), potassium nitrate (KNO 3), barium nitrate (Ba (NO 3) 2), sodium perchlorate (NaClO 4) Calcium chloride (CaCl2) and potassium formate, and the first aqueous solution and the second aqueous solution may be provided with a flue gas waste heat recovery and white smoke reduction device including different chemicals.

According to the embodiment of the present invention, the latent heat contained in the flue gas generated in the combustion facility can be recovered to enhance the energy efficiency.

Further, the white smoke phenomenon caused by the flue gas is effectively suppressed, and the pollutants are also effectively removed, thereby reducing environmental pollution caused by the flue gas.

FIG. 1 is a diagram illustrating a flue gas waste heat recovery and white smoke reduction apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a flue gas waste heat recovery and white smoke reduction apparatus according to a second embodiment of the present invention.
FIG. 3 is a diagram illustrating a flue gas waste heat recovery and white smoke reduction apparatus according to a third embodiment of the present invention.
FIG. 4 is a diagram illustrating the structure of the pressure reducing separator of FIG. 3; FIG.
FIG. 5 is a diagram illustrating the flue gas waste heat recovery and white smoke reduction apparatus according to the fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a diagram illustrating a flue gas waste heat recovery and white smoke reduction apparatus according to a first embodiment of the present invention.

Prior to the description, the flue gas waste heat recovery and white smoke reduction apparatus are devices for post-treating the flue gas to a large extent and discharging the flue gas to the atmosphere.

Referring to FIG. 1, a flue gas treating apparatus 1 according to a first embodiment of the present invention is a flue gas treating apparatus according to the first embodiment of the present invention, in which flue gas introduced into the inlet 10 from the outside is injected to remove pollutants and moisture below a predetermined level, And a bypass line 12 through which the flue gas introduced into the inlet 10 bypasses the main body 100 and is discharged to the funnel 14.

Here, the flue gas to be introduced is an exhaust gas discharged after combustion in the combustion facility. Examples of the combustion facilities include various power plants, incinerators, metal melting furnaces, boilers, and wet desulfurization facilities.

In this embodiment, the after-treatment flue gas discharged from the main body 100 is joined to the bypass line 12 as an example, but this is only an example, It is also possible to connect it to the funnel 14.

A valve for controlling the flow of gas may be appropriately provided on each line supplied to and discharged from the bypass line 12 and the main body 100 at the inlet 10.

The main body 100 includes a first injection nozzle 102, a second injection sill 108, an upper packing 106, a lower packing 101, a central hopper 104, a plasma filter 103, (105).

The upper packing 101 and the lower packing 101 are thick plate-like members formed of stainless steel and formed with a plurality of voids through which the flue gas passes.

Examples of the chemicals contained in the aqueous solution injected through the first injection nozzle 102 include sodium hydroxide (NaOH), calcium nitrate (Ca (NO ₃ ) ₂ ), ammonium nitrate (NH ₄ NO ₃ ) ₄ ) ₂ SO ₃ ), Ba (CIO ₄ ) ₂ , KHCO ₃ , NaNO ₃ , NAClO ₃ , KNO ₃ , (Ba (NO ₃ ) ₂ ), sodium perchlorate (NaClO 4), sodium chloride (NaCl), calcium chloride (CaCl ₂ ) and potassium formate.

The center hopper 104 is provided in an annular shape having a hole at its center so as to allow the flue gas to pass through the center, and is inclined downward from the center to the outer side, It has a shape that can be gathered.

In addition, a roof may be formed at the center of the central hopper 104 so that the water falling from the upper side is not transmitted to the lower side of the central hopper 104.

The plasma filter 103 includes a negatively charged and micropored discharge electrode and a positively charged collecting electrode.

When a high voltage is applied to the collector electrode and the discharge electrode, electrons are generated in the discharge electrode itself or electrons are generated in the gas around the electrode to form a plasma around the discharge electrode. Plasma is characterized in that electrons are separated from atoms or molecules in a gaseous state to contain electrons and ions, and have high electrical conductivity.

When the gas containing the impurity passes through the discharge electrode, electrons generated in the discharge electrode adhere to the impurity particles to cause the particles to become negative, and the negatively charged particles move to and adhere to the positive electrode charged by the electrostatic attraction Impurities are removed.

The high efficiency particulate arrestor filter 105 is a filter made of man-made fibers and has a removal rate of 95 to 99.97% for particles having a diameter of 0.3 or more.

In this embodiment, a case where a HEPA filter is provided as an upper filter of the main body 100 is described as an example, but the present invention is not limited thereto. Any filter such as a mist filter other than the HEPA filter may be provided .

The first injection nozzle 102 is connected to the first circulation line 110 to deliver the aqueous solution containing the chemicals and the first circulation line 110 is connected to the first injection nozzle 102). ≪ / RTI >

The first supply line 130 through which the aqueous solution is injected from the first storage tank 132 through which the aqueous solution to be injected is stored through the first injection nozzle 102 is connected to the first circulation line 110.

Further, the aqueous solution flowing through the first circulation line 110 is wastewater treated through the wastewater treatment line 160 when the concentration of the pollutant is high, or when the circulation period is long and needs to be disposed. To this end, the first circulation line 110 is connected to the wastewater treatment line 160.

The second injection line 108 is connected to the second circulation line 120 to transfer the aqueous solution and the second circulation line 120 is connected to the central hopper 104 provided below the second injection line 108 To circulate the supplied aqueous solution through the second jetting line 108.

Here, the aqueous solution circulated through the first circulation line 110 and injected into the first injection nozzle 102 is referred to as a first aqueous solution, and the second aqueous solution is circulated through the second circulation line 120 to be injected into the second injection nozzle 108 The aqueous solution may be referred to as a second aqueous solution.

The chemicals contained in the second aqueous solution may include sodium hydroxide (NaOH), calcium nitrate (Ca (NO ₃ ) ₂ ), ammonium nitrate (NH ₄ NO ₃ ), ammonium sulfate (NH ₄ ) ₂ SO ₃ , Ba (CIO ₄ ) ₂ , potassium hydrogen carbonate (KHCO ₃ ), sodium nitrate (NaNO ₃ ), sodium chlorate (NAClO ₃ ), potassium nitrate (KNO ₃ ) , One contained in the first aqueous solution of barium nitrate (Ba (NO ₃ ) ₂ ), sodium perchlorate (NaClO 4), sodium chloride (NaCl), calcium chloride (CaCl ₂ ) and potassium formate.

However, this is merely an example, and the spirit of the present invention is not limited thereto. For example, the second aqueous solution may be condensed water not containing the drug, or may be an aqueous solution containing the same drug as the drug contained in the first aqueous solution.

The aqueous solution collected in the central hopper 104 absorbs the waste heat of the hot flue gas and is heated to a high temperature. The water is transferred to the heat exchanger 170 provided in the middle of the second circulation line 120, Heat exchanges.

Thus, the second aqueous solution absorbing the waste heat of the flue gas exchanges heat with the water supplied to the water supply line 150 and the heat exchanger 170, thereby increasing the temperature of the water. Water with a higher temperature can be used as an energy source, for example, as a district heating water.

The second aqueous solution passed through the heat exchanger 170 is again supplied to the second injection saddle 108. At this time, the second storage tank 142 is connected to the downstream side of the heat exchanger 170 through the second supply line 140, whereby the low-temperature second aqueous solution can be charged.

The second circulation line 120 is connected to the wastewater treatment line 160 at the upstream side of the heat exchanger 170 so that the second high-temperature aqueous solution can be treated as wastewater.

A pump and an on-off valve may be suitably provided on each of the above-described lines 110, 120, 130, 140, 150 and 160, and the operation of each pump and the on- Lt; / RTI >

Hereinafter, the operation and effect of the flue gas treating apparatus according to the present embodiment having the above-described structure will be described.

The flue gas introduced from the lower part of the main body 100 rises to the upper part of the main body 100 and joins to the bypass line 12 and is discharged to the funnel 14. [

At this time, in the process of ascending the main body 100, the lower packing 101, the first aqueous solution injected from the first injection nozzle 102, the upper packing 106, 2 aqueous solution, the plasma filter 103, and the HEPA filter 105 in order to remove contaminants and moisture contained in the flue gas, and waste heat contained in the hot flue gas is recovered and used to heat the water.

The flue gas formed in the lower packing 101 is brought into contact with the first aqueous solution injected from the first injection nozzle 102 when the flue gas passes through and the flue gas and the first aqueous solution come into contact with each other in the narrow gap, The effect of removing the pollutants due to the pollutants can be enhanced.

The pollutants to be removed by the first aqueous solution injected through the first injection nozzle 102 include hydrochloric acid, sulfuric acid, dust, and the like.

The flow rate of the wastewater treated in the wastewater treatment line 160 in the first aqueous solution flowing through the first circulation line 110 and the flow rate of the first aqueous solution supplemented in the first supply line 130 can be controlled by the control unit.

The second aqueous solution sprayed from the second spray row 108 contacts the flue gas passing through the gap formed in the upper packing 101 to condense the steam contained in the hot flue gas while absorbing the heat of the flue gas, .

Thus, the second aqueous solution injected from the second injection line 108 and the water condensed in the steam contained in the flue gas descend and collect in the central hopper 104.

Since the second aqueous solution collected in the central hopper 104 absorbs the heat of the flue gas, the temperature of the second aqueous solution is higher than that of the second aqueous solution injected from the second injection line 108.

The second aqueous solution having a higher temperature is circulated to the second circulation line 120 while a part of the second aqueous solution is wastewater treated to the wastewater treatment line 160 and the remainder is supplied to the water supply line 150 while passing through the heat exchanger 170 Heat exchange with water to heat the water.

The second aqueous solution that has passed through the heat exchanger 170 joins with the second aqueous solution supplied from the second storage tank 142 to lower the temperature. At this time, the flow rate of the second aqueous solution treated through wastewater and the flow rate of the second aqueous solution supplied through the second supply line 140 can be controlled by the control unit.

As the second aqueous solution is sprayed, the flue gas from which moisture is removed and the heat is absorbed is passed through the plasma filter 103 and the HEPA filter 105 in order, while the flue gas is rising in the main body 100. In this process, .

As described above, the flue gas treating apparatus 1 according to the first embodiment can effectively suppress the white smoke phenomenon because the water causing the flue gas of the flue gas generated in the combustion facility is effectively removed, As a result, environmental pollution due to flue gas can be reduced. Further, since the latent heat of the combustion equipment for discharging the flue gas can be recovered and recycled, the energy efficiency can be increased.

On the other hand, if the concentration of the pollutants contained in the first aqueous solution flowing through the first circulation line is high, contaminants in the flue gas may not be effectively removed.

Accordingly, when the concentration of the pollutant becomes too high, it is necessary to treat the wastewater and newly adjust the concentration of the pollutant in the first aqueous solution flowing through the first circulation line 110 by supplying the first aqueous solution. However, The flue gas treating apparatus 1 according to the embodiment lacks means for this, and thus it is difficult to operate the flue gas treating apparatus 1 efficiently.

In addition, the steam contained in the flue gas at high temperature and the second aqueous solution at low temperature meet to condense the water vapor of the flue gas. If the temperature of the second aqueous solution supplied is high, steam does not condense properly, The second aqueous solution may be vaporized.

In order to suppress such a phenomenon, the temperature of the second aqueous solution sprayed from the second jetting line 108 needs to be regulated to a certain level or less, but the second aqueous solution, which has been brought into contact with the high temperature flue gas, ) To the second circulation line 120 so that the temperature of the second aqueous solution is not sufficiently lowered, and the water is sprayed to the second spray row 108, so that the water vapor content of the flue gas becomes rather high.

In order to solve the above-mentioned problems, a flue gas treating apparatus 2 according to a second embodiment described below is proposed. Hereinafter, a flue gas treating apparatus 2 according to a second embodiment of the present invention will be described with reference to Fig.

FIG. 2 is a diagram illustrating a flue gas treating apparatus according to a second embodiment of the present invention.

Referring to FIG. 2, the flue gas treating apparatus 2 according to the second embodiment is similar to the first embodiment except that the flue gas introduced into the inlet 20 from the outside is injected into the flue gas treating apparatus 2, And a bypass line 22 through which the flue gas introduced into the inlet 20 bypasses the main body 200 and is discharged to the funnel 24.

The main body 200 includes a first injection nozzle 202, a second injection nozzle 208, an upper packing 206, a lower packing 201, a central hopper 204, a plasma filter 203, And a HEPA filter (205).

A first circulation line 210 for supplying an aqueous solution of a high concentration to the first injection nozzle 202 and a central hopper 204 provided below the second injection nozzle 208 for collecting A second circulation line 220 for supplying the second aqueous solution to the second injection nozzle 208 and a first supply line for injecting the aqueous solution stored in the first storage tank 232 into the first circulation line 210 A second supply line 240 for supplying the second aqueous solution stored in the second storage tank 242 to the second circulation line 220, a water supply line 250 for supplying water from the outside, A heat exchanger 270 provided on the second circulation line 220 and the water supply line 250 to cause heat exchange between the second aqueous solution flowing through the second circulation line 220 and the water flowing in the water supply line 250, . ≪ / RTI >

A pump and an on-off valve may be suitably provided on each of the above-described lines 210, 220, 230, 240, 250 and 260. The operation of each pump and the on- ). ≪ / RTI >

On the other hand, on the first circulation line 210, a concentration measuring sensor 212 for measuring the concentration of contaminants contained in the aqueous solution which is high in the bottom of the main body 200 is provided, Is transmitted to the control unit.

The control unit closes the valve of the first circulation line 210 when the measured concentration value is higher than the predetermined concentration value and opens the valve of the line branching from the first circulation line 210 to the wastewater treatment line 260 So that the aqueous solution which is high at the bottom of the main body 200 can be treated as wastewater.

At this time, the predetermined concentration value may be set to a maximum value of the concentration of the pollutant so that the removal of the pollutant can be performed at a desired level or more with respect to the flow rate of the predetermined aqueous solution.

While the aqueous solution is being wastewater treated, the first aqueous solution is supplied from the first storage tank 232 so that the flow rate of the first aqueous solution injected into the first injection nozzle 202 can be kept constant during wastewater treatment.

On the other hand, the flue gas treating apparatus 2 according to the present embodiment is configured such that the flue gas treating apparatus 2 according to the present embodiment is branched on the downstream side of the heat exchanger 270 on the second circulation line 220 and flows on the upstream side of the heat exchanger 270 on the second circulation line 220 And a reflux line 280 connected thereto.

Accordingly, the second aqueous solution that has passed through the heat exchanger 270 can be selectively returned to the upstream side of the heat exchanger 270 on the second circulation line 220 through the reflux line 280.

A temperature sensor 222 is provided on the second circulation line 220 upstream of the heat exchanger 270 to measure the temperature of the second aqueous solution and the temperature sensor 222 is connected to the circulation line 280 And is disposed on the downstream side of the connection point. The temperature of the second aqueous solution measured by the temperature sensor 222 is transmitted to the control unit.

When the temperature of the second aqueous solution measured by the temperature sensor 222 is higher than a predetermined temperature, the control unit closes the second circulation line 220 and simultaneously opens the second supply line 240 to open the second storage tank 242 to the second injection nozzle 208 and the reflux line 280 is opened to control the second aqueous solution discharged from the heat exchanger 270 to flow through the reflux line 280 .

At this time, the preset temperature is set to the temperature of the second aqueous solution in which the second aqueous solution injected by the temperature of the flue gas injected within the predetermined temperature range is not vaporized and the water vapor contained in the flue gas can condense .

In the case where the reflux line 280 is opened while the second aqueous solution is continuously supplied from the central hopper 204, in order to maintain the flow rate of the circulating second aqueous solution at a constant level, some of the refluxed second aqueous solution Can be controlled to be treated through a wastewater treatment line (260).

The flue gas treating apparatus 2 according to the second embodiment of the present invention having the above-described structure can appropriately adjust the concentration of contaminants in the aqueous solution injected into the first injection nozzle 202, There is an effect that removal can be effected effectively.

Also, since the temperature of the second aqueous solution injected to the second injection nozzle 208 is controlled to be a certain level or lower, the vaporization of the second aqueous solution in contact with the flue gas is suppressed, The temperature of the second aqueous solution in which the second aqueous solution and the water are exchanged in the heat exchanger 270 can be maintained at a high temperature since the second aqueous solution can be refluxed and the heat exchange can be continuously performed.

On the other hand, according to the first and second embodiments described above, if the concentration of the pollutant contained in the aqueous solution becomes high, the waste water treatment is inevitable, so that there is a problem that the chemical consumption efficiency is low.

Further, if impurities are contained in the second aqueous solution flowing through the second circulation line, there may arise a problem that the second injection nozzle is broken or the pores of the upper packing are blocked.

In order to solve the above-mentioned problems, a flue gas treating apparatus 3 according to the third embodiment described below is proposed. Hereinafter, a flue gas treating apparatus 3 according to a third embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG.

FIG. 3 is a schematic view of a flue gas treating apparatus according to a third embodiment of the present invention, and FIG. 4 is a diagram illustrating the structure of the decompression separator of FIG.

3 and 4, in the flue gas treating apparatus 3 according to the third embodiment, as in the first embodiment, flue gas introduced into the inlet 30 from the outside is injected into the flue gas treating apparatus 3, And a bypass line 32 through which the flue gas introduced into the inlet 30 bypasses the main body 300 and is discharged to the funnel 34. [

The main body 300 has a first injection nozzle 302, a second injection nozzle 308, an upper packing 306, a lower packing 301, a central hopper 304, a plasma filter 303, And a HEPA filter 305.

A first circulation line 310 for supplying the aqueous solution having a higher concentration to the first injection nozzle 302 and a central hopper 304 provided below the second injection nozzle 308 collect A first supply line 330 for injecting the aqueous solution stored in the first storage tank 332 into the first circulation line 310, and a second circulation line 320 for supplying the aqueous solution stored in the first storage tank 332 to the second injection nozzle 308. [ A second supply line 340 for supplying the aqueous solution stored in the second storage tank 342 to the second circulation line 320, a water supply line 350 for supplying water from the outside, (370) provided on the water supply line (350) and causing heat exchange between the second aqueous solution flowing through the second circulation line (320) and the water flowing in the water supply line (350) have.

In addition, pumps and open / close valves may be suitably provided to the above-described lines 310, 320, 330, 340, 350 and 360, respectively, ). ≪ / RTI >

On the other hand, a cyclone 312 and a filter 314 are provided on the first circulation line 310 to remove contaminants contained in the first aqueous solution, and the decompression valve 3164 separates the separated tanks And a decompression separator 316 for separating the water contained in the aqueous solution by reducing the boiling point of the aqueous solution.

A cyclone 322 and a filter 324 may also be provided on the second circulation line 320 to remove impurities contained in the condensed water. At this time, the filter 324 and the cyclone 322 may be disposed on the downstream side of the heat exchanger 370.

The decompression separator 326 may be provided in the second circulation line 320 and the decompression separator 316 provided in the first circulation line 310 and the decompression separator 326 provided in the second circulation line 320, May have the same configuration and function.

In the present embodiment, one filter and one cyclone are provided on the first circulation line 310 and the second circulation line 320, respectively. However, the present invention is not limited thereto, It can be freely transformed within a range that does not harm the idea of.

For example, only a filter may be provided on the first circulation line 310 and the second circulation line 320, or only a cyclone may be provided, or a plurality of circles may be provided.

The cyclones 312 and 322 provided in each line have a constitution in which contaminants or impurities contained in the aqueous solution introduced into the inside are separated by a centrifugal force, the contaminants or impurities are treated as waste water, and the separated aqueous solution is discharged.

The filters 314 and 324 also include filtering membranes having micropores to filter out large contaminants or impurities and allow only small aqueous solutions to pass through the filters.

4, the decompression separator 316 may include a separation tank 3162, a pressure reducing valve 3164, a blower 3166, and a discharge line 2165.

The pressure reducing valve 3164 is provided on the inlet side of the separation tank 3162 and the blower is provided on the upper side of the separation tank 3162. Further, the discharge line 2165 is connected to the blower 3166 to discharge the water vapor generated in the separation tank 3162.

The aqueous solution introduced into the separation tank 3162 is in a state in which water and chemicals are mixed and is decompressed to a predetermined pressure or lower by the pressure reducing valve 3164.

When the pressure of the aqueous solution introduced into the separation tank 3162 is lowered, the boiling point of the aqueous solution is lowered, so that the water contained in the aqueous solution can be vaporized even at a low temperature. At this time, the heat necessary for vaporizing the water contained in the aqueous solution may be supplied from the outside, but if the pressure inside the separation tank 3162 is sufficiently low, it is possible to vaporize the water without such external heating, Can be reduced.

Accordingly, when at least a part of the water contained in the aqueous solution in the separation tank 3162 is vaporized, it is raised to the top of the separation tank 3162 and is discharged to the outside through the discharge line 2165 by the blower 3166 and removed .

The aqueous solution from which the water is removed is discharged from the separation tank 3162 and injected into the main body 300 through the first injection nozzle 302 through the first circulation line 310.

Thus, the chemical concentration of the aqueous solution injected by the first injection nozzle 302 and the second injection nozzle 108 can be maintained at a high level, and the removal efficiency of the pollutant can be increased.

The flue gas treating apparatus 3 according to the second embodiment of the present invention having the above-described structure is provided with the cyclone 312 and the filter 314 on the first circulation line 310, By filtering the contaminants, the amount of the aqueous solution treated by the wastewater can be reduced to a large extent, so that the efficiency of consuming the medicine is increased.

In addition, impurities contained in the condensed water are removed by the cyclone 322 and the filter 324 provided on the second circulation line 320, so that the second injection nozzle 308 is broken or the air gap of the upper packing 306 And the like can be suppressed.

On the other hand, the flue gas treating apparatus 4 according to the fourth embodiment of the present invention described below is characterized in that a heat exchanger is provided also in the first circulation line when compared with the first, second and third embodiments described above There is a difference in point. Hereinafter, a flue gas treating apparatus 4 according to a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a diagram illustrating a flue gas treating apparatus according to a fourth embodiment of the present invention.

Referring to FIG. 5, the flue gas treating apparatus 4 according to the fourth embodiment is similar to the first embodiment except that the flue gas introduced into the inlet 40 from the outside is injected to remove the contaminants and moisture to a predetermined level or less And a bypass line 42 through which the flue gas introduced into the inlet 40 bypasses the main body 400 and is discharged to the funnel 44.

The main body 400 includes a first injection nozzle 402, a second injection nozzle 408, an upper packing 406, a lower packing 401, a central hopper 404, a plasma filter 403, And a HEPA filter 405.

A first circulation line 410 for supplying a high aqueous solution to the first injection nozzle 402 and a central hopper 404 provided below the second injection nozzle 408 collect A second circulation line 420 for supplying the aqueous solution to the second injection nozzle 408 and a first supply line 450 for injecting the first aqueous solution stored in the first storage tank 432 into the first circulation line 410 A second supply line 440 for supplying the second aqueous solution stored in the second storage tank 442 to the second circulation line 420, a water supply line 450 for supplying water from the outside, Which is provided on the second circulation line 420 and the water supply line 450 to cause heat exchange between the second aqueous solution flowing in the second circulation line 420 and the water flowing in the water supply line 450, 472 provided on the first circulation line 410 and the water supply line 450 to supply the first aqueous solution flowing through the first circulation line 410 and the water Causing a heat exchange between the flowing-level line 450. Water may comprise a second heat exchanger (474).

A pump and an on-off valve may be suitably provided on each of the above-described lines 410, 420, 430, 440, 450, and 460. The operation of each pump and the on- ). ≪ / RTI >

A cyclone 412 and a filter 414 may be provided on the first circulation line 410 to remove contaminants contained in the first aqueous solution and may further include a decompression separator 418. The decompression separator 418 of this embodiment is the same in construction and operation as the decompression separator 316 of the third embodiment described above.

The cyclone 422 and the filter 424 may also be provided on the second circulation line 420 to remove the impurities contained in the second aqueous solution and further include the decompression separator 426. The decompression separator 426 of this embodiment is the same in construction and operation as the decompression separator 316 of the third embodiment described above.

On the other hand, the water flowing along the water supply line 450 is heat-exchanged with the second high-temperature aqueous solution absorbing the heat of the flue gas in the first heat exchanger 472, and is primarily heated, and the second heat exchanger 474 Exchanged with the first aqueous solution, is secondarily heated, and then discharged.

The first aqueous solution flowing through the first circulation line 410 is circulated by the pump that is provided at the bottom of the main body 400 and provided to the first circulation line 410, It is heated in direct contact with the flue gas.

As a result, the temperature becomes higher, and the second aqueous heat exchange with the first aqueous solution at a higher temperature results in a higher temperature of the water, and the heat of the flue gas can be absorbed in two stages.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, a person skilled in the art can change the material, size and the like of each constituent element depending on the application field or can combine or substitute the embodiments in a form not clearly disclosed in the embodiments of the present invention, Of the range. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that such modified embodiments are included in the technical idea described in the claims of the present invention.

1, 2, 3, 4: flue gas treatment device
100, 200, 300, 400:
110, 210, 310, 410: first circulation line
120, 220, 320, 420: a second circulation line
130, 230, 330, 430: a first supply line
140, 240, 340, 440: a second supply line
150, 250, 350, 450: Water supply line
160, 260, 360, 460: Wastewater treatment line
170, 270, 370, 470: heat exchanger
472: first heat exchanger
474: Second heat exchanger

Claims (11)

A main body including a first injection nozzle for injecting a first aqueous solution into a flue gas supplied into the flue gas, and a second injection nozzle for injecting a second aqueous solution into the flue gas;
A first circulation line for supplying an aqueous solution having a high concentration to a bottom of the main body to the first injection nozzle;
A second circulation line for supplying an aqueous solution collected in a central hopper provided below the second injection nozzle to the second injection nozzle;
A first supply line for supplying the first aqueous solution stored in the first storage tank to the first circulation line;
A second supply line for supplying the second aqueous solution stored in the second storage tank to the second circulation line;
A water supply line to which water is supplied from outside; And
And a heat exchanger provided on the second circulation line and the water supply line for causing heat exchange between the second aqueous solution flowing through the second circulation line and the water flowing in the water supply line,
Wherein the first aqueous solution and the second aqueous solution include a pollutant contained in the flue gas and a drug adsorbing moisture,
The main body includes:
A plasma filter for collecting water vapor and contaminants contained in the flue gas; And
Further comprising a packing having a plurality of voids through which the flue gas passes,
The flue gas is fed to the bottom of the body,
The first injection nozzle is provided below the second injection nozzle,
Wherein the central hopper is disposed between the first injection nozzle and the second injection nozzle,
Wherein the packing is provided as a single layer between the second injection nozzle and the central hopper,
Wherein the packing is provided on the lower side of the first injection nozzle while forming another layer of the flue gas. delete The method according to claim 1,
The main body includes:
And a HEPA filter provided at an upper portion of the main body and collecting water vapor and contaminants contained in the flue gas. delete The method according to claim 1,
Further comprising a reflux line branching from the downstream side of the heat exchanger on the second circulation line and connected to the upstream side of the heat exchanger on the second circulation line,
Wherein the second aqueous solution passed through the heat exchanger is selectively returned to the upstream side of the heat exchanger on the second circulation line through the reflux line. 6. The method of claim 5,
The second circulation line may include:
And a temperature sensor provided on the upstream side of the heat exchanger to measure the temperature of the second aqueous solution,
Wherein the temperature sensor is disposed downstream of a point where the reflux line is connected. The method according to claim 6,
Further comprising a control unit for controlling an opening / closing valve of the second circulation line, the second supply line, and the reflux line,
Wherein,
When the temperature of the second aqueous solution measured by the temperature sensor is equal to or higher than a predetermined temperature, the second circulation line is closed and the second supply line is opened to transfer the second aqueous solution from the second storage tank to the second injection nozzle Supplying the second aqueous solution,
And the second aqueous solution discharged from the heat exchanger is allowed to flow through the reflux line by opening the reflux line. delete delete delete The method according to any one of claims 1, 3, and 5 to 7,
The first aqueous solution and the second aqueous solution may contain sodium hydroxide (NaOH), calcium nitrate (Ca (NO3) 2), ammonium nitrate (NH4NO3), ammonium sulfate ((NH4) 2SO3), barium perchlorate ), Sodium nitrate (NaNO3), potassium nitrate (KNO3), barium nitrate (Ba (NO3) 2), sodium perchlorate (NaClO4), sodium chloride (NaCl), calcium chloride CaCl 2) and potassium formate,
Wherein the first aqueous solution and the second aqueous solution contain different chemicals.

Images