Optimized wet process system for waste incineration flue gas purification

Abstract

The utility model discloses an optimized wet-process system for purifying waste incineration flue gas, and relates to the technical field of wet-process tower desulfurization systems. The device comprises a wet tower, a cooling absorption circulating system, a dehumidifying circulating system and an alkali liquor adding and slurry measuring system, wherein the wet tower is provided with a slurry tank, a wet tower flue gas inlet, a cooling absorption part, a cooling and dehumidifying part and a wet tower flue gas outlet; a flue gas inlet of the wet process tower is connected with an inlet flue; the cooling absorption part is provided with a cooling absorption spraying layer and a cooling absorption part demister; the cooling and dehumidifying part is provided with a collecting disc, a packing layer, a dehumidifying spraying layer and a cooling and dehumidifying part demister; and the alkali liquor adding and slurry measuring system comprises an alkali liquor conveying pump. According to the utility model, the defects that a traditional alkali adding point is arranged in front of the pump, so that the system stops adding alkali after the measured value of the pH meter reaches the designed value within a short time after alkali adding, the actual pH value of the slurry is not adjusted in place, and the alkali liquor delivery pump is frequently started are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of wet tower desulfurization systems, and more specifically is an optimized wet system for purifying flue gas from garbage incineration. Background Art

[0002] As emission limits become increasingly stringent, the desulfurization effect of the "semi-dry method + dry method" used in the flue gas purification and desulfurization process of large and medium-sized waste incineration in my country is difficult to directly meet ultra-low emission standards. Therefore, a small wet tower is often configured on the basis of the original process for further desulfurization of low-sulfur flue gas.

[0003] However, in actual operation, the pH value of the wet tower slurry is often inaccurately measured, resulting in poor desulfurization effect of the wet tower. In order to ensure the export SO 2 Continuous addition of alkali even when the emission meets the standard causes the actual pH value in the tower to be too high, thereby accelerating the corrosion of the pipeline and tower internals. After analysis, the unreasonable method of adding alkali to the wet tower is the main reason for the inaccurate pH measurement of the wet tower slurry.

[0004] Therefore, it is necessary to develop an optimized wet system for waste incineration flue gas purification by improving the wet tower alkali addition method. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide an optimized wet system for purifying flue gas from garbage incineration.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: an optimized wet system for purifying flue gas from garbage incineration, characterized in that it includes a wet tower, a cooling absorption circulation system, a dehumidification circulation system and an alkali solution addition and slurry measurement system, wherein the wet tower is provided with a slurry pool, a wet tower flue gas inlet, a cooling absorption part, a cooling and dehumidification part and a wet tower flue gas outlet in sequence from bottom to top;

[0007] The wet tower flue gas inlet is connected to the inlet flue;

[0008] The cooling absorption part is provided with a cooling absorption spray layer and a cooling absorption part demister in sequence from bottom to top;

[0009] The cooling and dehumidifying part is provided with a collecting tray, a packing layer, a dehumidifying spray layer, and a cooling and dehumidifying part demister from bottom to top;

[0010] One end of the cooling absorption circulation system is connected to the slurry pool through the cooling absorption circulation system inlet pipe, and the other end is connected to the cooling absorption spray layer through the cooling absorption circulation system outlet pipe;

[0011] One end of the dehumidification circulation system is connected to the collection plate through the dehumidification circulation system inlet pipe, and the other end is connected to the dehumidification spray layer through the dehumidification circulation system outlet pipe;

[0012] The alkali solution addition and slurry measurement system comprises an alkali solution delivery pump, which is connected to the outlet pipeline of the cooling absorption circulation system through a first delivery pipeline, and is connected to the outlet pipeline of the dehumidification circulation system through a second delivery pipeline.

[0013] In the above technical solution, the cooling absorption circulation system includes a cooling absorption circulation pump, one end of the inlet pipe of the cooling absorption circulation system is connected to the bottom side of the slurry pool, and the other end is connected to the inlet of the cooling absorption circulation pump, and one end of the outlet pipe of the cooling absorption circulation system is connected to the outlet of the cooling absorption circulation pump, and the other end is connected to the cooling absorption spray layer.

[0014] In the above technical solution, the dehumidification circulation system includes a dehumidification water tank, a dehumidification circulation pump, and a dehumidification liquid heat exchanger. The collection plate is connected to the dehumidification water tank. One end of the dehumidification circulation pump is connected to the bottom side of the dehumidification water tank through the dehumidification circulation system inlet pipe, and the other end is connected to the dehumidification liquid heat exchanger through the dehumidification circulation system outlet pipe. The dehumidification liquid heat exchanger is connected to the dehumidification spray layer.

[0015] In the above technical solution, the alkali solution addition and slurry measurement system also includes a first measuring pipeline and a second measuring pipeline; the first measuring pipeline is connected to the outlet pipeline of the cooling absorption circulation system, and a salinity meter and a pH meter are arranged on the first measuring pipeline; the second measuring pipeline is connected to the outlet pipeline of the dehumidification circulation system, and a pH meter is arranged on the second measuring pipeline.

[0016] The above technical solution also includes an emergency sprinkler system, which includes an elevated emergency water tank and an emergency sprinkler device. The bottom side of the elevated emergency water tank is connected to the emergency sprinkler device, and the emergency sprinkler device is arranged in the inlet flue.

[0017] In the above technical scheme, it also includes a flushing water system, which is connected to the wet tower through a first flushing pipe, the flushing water system is connected to the cooling absorption part demister through a second flushing pipe, the flushing water system is connected to the cooling and dehumidification part demister through a third flushing pipe, the flushing water system is connected to the first measuring pipe through a fourth flushing pipe, the flushing water system is connected to the second measuring pipe through a fifth flushing pipe, and the flushing water system is connected to the high-mounted emergency water tank through a sixth flushing pipe.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1) The utility model optimizes the wet tower alkali addition method, sets the alkali addition point at the outlet pipe of the cooling absorption circulation system and the outlet pipe of the dehumidification circulation system, and utilizes the cooling absorption spray layer and the dehumidification spray layer to fully mix the added alkali solution with the slurry in the slurry pool and the dehumidification water in the dehumidification water tank, thereby avoiding the disadvantages of the traditional alkali addition point being set in front of the pump, resulting in the system stopping alkali addition after the pH meter measured value reaches the design value within a short time after alkali addition, while the actual pH value of the slurry has not been adjusted in place, and the alkali solution delivery pump is frequently started.

[0020] 2) The utility model arranges an emergency spray system at the flue gas inlet of the wet tower. When the front-end purification system operates abnormally and causes the flue gas temperature at the wet tower inlet to exceed the design value, the emergency spray device automatically starts, and the water in the high-mounted emergency water tank utilizes the gravity difference to spray into the flue gas inlet of the wet tower through the nozzle of the emergency spray device, thereby reducing the flue gas temperature to below the design value, thereby effectively protecting the internal components of the wet tower.

[0021] 3) A salinity meter and a pH meter are arranged on the first measuring pipeline of the utility model, wherein the salinity meter is used to control the amount of waste liquid discharged from the outlet of the wet tower to keep the salinity in the slurry at 3%-5%; the pH meter is used to detect the pH value of the slurry in the slurry pool. When the pH value of the slurry in the slurry pool is low, the alkali solution delivery pump is started to add alkali to the outlet pipeline of the cooling absorption circulation system, and the alkali solution is sprayed through the nozzle of the cooling absorption spray layer to be uniformly mixed with the slurry in the slurry pool to control the pH value to be maintained at about 6; it has the advantages of stable operation, material saving and flexible adjustment.

[0022] 4) A pH meter is arranged on the second measuring pipe of the utility model; when the pH value of the slurry in the dehumidification water tank is acidic, the alkali solution delivery pump is started to add alkali to the outlet pipe of the dehumidification circulation system, and the alkali solution is sprayed through the nozzle of the dehumidification spray layer and evenly mixed with the slurry in the collection tray to control the pH value to be maintained at about 7; the utility model has the advantages of stable operation, material saving and flexible adjustment.

[0023] 5) The interior of the wet tower of the utility model is divided into two independent partitions, the cooling absorption part and the cooling and dehumidifying part, through a collecting plate, so as to achieve the dual effects of single-tower absorption and dehumidification; when the desulfurization effect of the cooling absorption part at the lower part is not good, the pH value of the dehumidification circulating fluid in the cooling and dehumidifying part at the upper part can be increased, so as to further absorb the acidic gas in the flue gas while dehumidifying the flue gas, and ensure that SO 2 Ultra-low gas emissions; it has the advantages of stable operation, economical material consumption and flexible adjustment.

[0024] 6) The utility model is provided with a flushing water system. The flushing water from the flushing water system can replenish the high-mounted emergency water tank, and can flush the wet tower, the cooling absorption part demister, the cooling and dehumidification part demister, the first measuring pipe and the second measuring pipe, thereby increasing the service life of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] Among them, 1-wet tower, 11-slurry pool, 12-wet tower flue gas inlet, 13-cooling absorption part, 131-cooling absorption spray layer, 132-cooling absorption part demister, 14-cooling and dehumidifying part, 141-collecting plate, 142-filling layer, 143-dehumidifying spray layer, 144-cooling and dehumidifying part demister, 15-wet tower flue gas outlet, 16-inlet flue, 17-exhaust outlet, 2-cooling absorption circulation system, 211-cooling absorption circulation system inlet pipe, 212-cooling absorption circulation system outlet pipe, 22-cooling absorption circulation pump, 3-dehumidification circulation system, 311-dehumidification circulation system inlet pipe, 312-dehumidification circulation system outlet Inlet pipeline, 32-dehumidification water tank, 33-dehumidification circulation pump, 34-dehumidification liquid heat exchanger, 4-alkali solution addition and slurry measurement system, 41-alkali solution delivery pump, 411-first delivery pipeline, 412-second delivery pipeline, 42-first measuring pipeline, 43-second measuring pipeline, 44-salinity meter, 45-pH meter, 5-accident spray system, 51-high emergency water tank, 52-accident spray device, 6-flushing water system, 61-first flushing pipeline, 62-second flushing pipeline, 63-third flushing pipeline, 64-fourth flushing pipeline, 65-fifth flushing pipeline, 66-sixth flushing pipeline, 7-low temperature SCR denitrification system, 8-high temperature flue gas. DETAILED DESCRIPTION

[0027] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0028] In order to solve the problems of inaccurate slurry pH measurement during the operation of a wet tower desulfurization system, which leads to unstable system operation, large alkali solution consumption, and increased corrosion of pipelines and tower internals, the utility model proposes an optimized wet system for waste incineration flue gas purification.

[0029] Referring to the attached drawings, it can be seen that an optimized wet system for waste incineration flue gas purification is characterized by comprising a wet tower 1, a cooling absorption circulation system 2, a dehumidification circulation system 3 and an alkali solution addition and slurry measurement system 4, wherein the wet tower 1 is provided with a slurry pool 11, a wet tower flue gas inlet 12, a cooling absorption part 13, a cooling and dehumidification part 14 and a wet tower flue gas outlet 15 in sequence from bottom to top;

[0030] The wet tower flue gas inlet 12 is connected to the inlet flue 16; the wet tower flue gas inlet 12 is connected to the inlet flue 16; the high-temperature flue gas after dry or semi-dry desulfurization passes through the inlet flue 16 and the wet tower flue gas inlet 12 in sequence and enters the upper space of the slurry pool 11 in the wet tower 1, and the high-temperature flue gas moves upward and enters the cooling absorption part 13;

[0031] The cooling absorption part 13 is provided with a cooling absorption spray layer 131 and a cooling absorption part demister 132 in sequence from bottom to top; most of the acidic gases in the flue gas are removed by the cooling absorption spray layer 131, and the droplets in the saturated flue gas are removed by the cooling absorption part demister 132, and then the flue gas enters the cooling and dehumidifying part 14 upward;

[0032] The cooling and dehumidifying section 14 is provided with a collecting plate 141, a packing layer 142, a dehumidifying spray layer 143, and a cooling and dehumidifying section demister 144 in order from bottom to top; the flue gas from the cooling and absorbing section 13 moves upward through the collecting plate 141, and is further cooled and partially precipitated with dehumidifying water in the packing layer 142 to avoid the white smoke plume that may appear under extremely cold external temperatures or abnormal operating conditions; the dehumidified flue gas passes through the cooling and dehumidifying section demister 144 to further remove droplets, and then enters the subsequent low-temperature SCR denitrification system 7 from the top of the wet tower 1;

[0033] One end of the cooling absorption circulation system 2 is connected to the slurry pool 11 through the cooling absorption circulation system inlet pipe 211, and the other end is connected to the cooling absorption spray layer 131 through the cooling absorption circulation system outlet pipe 212;

[0034] One end of the dehumidification circulation system 3 is connected to the collection plate 141 through a dehumidification circulation system inlet pipe 311, and the other end is connected to the dehumidification spray layer 143 through a dehumidification circulation system outlet pipe 312;

[0035] The alkali solution addition and slurry measurement system 4 includes an alkali solution delivery pump 41, which is connected to the cooling absorption circulation system outlet pipeline 212 through a first delivery pipeline 411, and the alkali solution delivery pump 41 is connected to the dehumidification circulation system outlet pipeline 312 through a second delivery pipeline 412;

[0036] The cooling absorption circulation system 2 includes a cooling absorption circulation pump 22, one end of the cooling absorption circulation system inlet pipe 211 is connected to the bottom side of the slurry pool 11, and the other end is connected to the inlet of the cooling absorption circulation pump 22, and one end of the cooling absorption circulation system outlet pipe 212 is connected to the outlet of the cooling absorption circulation pump 22, and the other end is connected to the cooling absorption spray layer 131; the slurry sprayed from the cooling absorption spray layer 131 reacts with the high-temperature flue gas, and the slurry after the reaction is collected in the slurry pool 11, and then the cooling absorption circulation pump 22 is used to cool the slurry. The slurry is sent to the cooling absorption spray layer 131 for circulating spraying. When the slurry in the slurry pool 11 reaches a certain salt content, it is discharged through the outlet 17 at the bottom of the wet tower 1. An alkali addition point is set at the outlet of the cooling absorption circulation pump 22 (the outlet pipeline 212 of the cooling absorption circulation system). After the slurry in the slurry pool 11 is mixed with the NaOH solution pumped in by the alkali solution delivery pump 41, it is sprayed downward through the nozzle of the cooling absorption spray layer 131 to fully countercurrently contact with the upward flue gas, thereby reducing the flue gas temperature and removing most of the acidic gas SO in the flue gas. 2 , HCl, HF, etc. for removal.

[0037] The dehumidification circulation system 3 includes a dehumidification water tank 32, a dehumidification circulation pump 33, and a dehumidification liquid heat exchanger 34. The collecting plate 141 is connected to the dehumidification water tank 32. One end of the dehumidification circulation pump 33 is connected to the bottom side of the dehumidification water tank 32 through the dehumidification circulation system inlet pipe 311, and the other end is connected to the dehumidification liquid heat exchanger 34 through the dehumidification circulation system outlet pipe 312. The dehumidification liquid heat exchanger 34 is connected to the dehumidification spray layer 143; the dehumidification water in the dehumidification water tank 32 is sent to the dehumidification spray layer 143 by the dehumidification circulation pump 33. 143, sprayed downward to the packing layer 142 through the nozzle of the dehumidification spray layer 143, fully contacted with the flue gas; the dehumidification water is collected by the collecting plate 141 and returned to the dehumidification water tank 32, and is further cooled by the dehumidification liquid heat exchanger 34 before recycling; an alkali adding point is set at the outlet position of the dehumidification circulation pump 33 (the outlet pipe 312 of the dehumidification circulation system), and the dehumidification liquid is mixed with the NaOH solution pumped in by the alkali liquid delivery pump 41, and then sprayed downward through the nozzle of the dehumidification spray layer 143 to fully countercurrently contact with the upward flue gas, so as to absorb the residual acid gas in the flue gas.

[0038] The alkali solution addition and slurry measurement system 4 also includes a first measurement pipeline 42 and a second measurement pipeline 43;

[0039] The first measuring pipeline 42 is connected to the outlet pipeline 212 of the cooling absorption circulation system, and a salinity meter 44 and a pH meter 45 are arranged on the first measuring pipeline 42; wherein the salinity meter 44 is used to control the amount of waste liquid discharged from the outlet 17 of the wet tower 1, and maintain the salinity of the slurry in the slurry pool 11 at 3%-5%; the pH meter 45 is used to detect the pH value of the slurry in the slurry pool 11, and when the pH value of the slurry in the slurry pool 11 is low, the alkali solution delivery pump 41 is started, and alkali is added to the outlet pipeline 212 of the cooling absorption circulation system through the first delivery pipeline 411, and the alkali solution is sprayed through the nozzle of the cooling absorption spray layer 131 and evenly mixed with the slurry in the slurry pool 11, and the pH value is controlled to be maintained at about 6;

[0040] The second measuring pipe 43 is connected to the outlet pipe 312 of the dehumidification circulation system, and a pH meter 45 is arranged on the second measuring pipe 43; when the desulfurization effect of the lower cooling absorption part 13 is not good, the pH value of the dehumidification circulation fluid in the upper cooling and dehumidification part 14 can be increased to further absorb the acid gas in the flue gas while dehumidifying the flue gas, so as to ensure that the SO 2 Ultra-low gas emissions.

[0041] It also includes an emergency sprinkler system 5, which includes an elevated emergency water tank 51 and an emergency sprinkler device 52. The bottom side of the elevated emergency water tank 51 is connected to the emergency sprinkler device 52, and the emergency sprinkler device 52 is arranged in the inlet flue 16; when the operating smoke temperature in the wet tower 1 exceeds the design value, the emergency sprinkler device 52 is automatically started, and the water in the elevated emergency water tank 51 is sprayed into the wet tower smoke inlet 12 through the nozzle of the emergency sprinkler device 52 using the gravity difference, thereby reducing the smoke temperature to below the design value, thereby effectively protecting the internal components of the wet tower 1.

[0042] It also includes a flushing water system 6, which is connected to the wet tower 1 through a first flushing pipe 61, connected to the cooling absorption part demister 132 through a second flushing pipe 62, connected to the cooling and dehumidifying part demister 144 through a third flushing pipe 63, connected to the first measuring pipe 42 through a fourth flushing pipe 64, connected to the second measuring pipe 43 through a fifth flushing pipe 65, and connected to the high-mounted emergency water tank 51 through a sixth flushing pipe 66; the flushing water from the flushing water system 6 can replenish the high-mounted emergency water tank 51, and can flush the wet tower 1, the cooling and absorption part demister 132, the cooling and dehumidifying part demister 144, the first measuring pipe 42 and the second measuring pipe 43.

[0043] The cooling absorption spray layer 131 has two layers; the cooling absorption circulation pumps 22 have two layers, and the two cooling absorption circulation pumps 22 are connected in parallel; the dehumidification circulation pumps 33 have two layers, and the two dehumidification circulation pumps 33 are connected in parallel; and the first measuring pipeline 42 is provided with two salinometers 44 .

[0044] In actual use, the method of using the utility model includes the following steps:

[0045] Step 1: The high-temperature flue gas from dry or semi-dry desulfurization passes through the inlet flue 16 and the wet tower flue gas inlet 12 in turn and enters the upper space of the slurry pool 11 in the wet tower 1. The high-temperature flue gas moves upward and enters the cooling absorption part 13; the high-temperature flue gas contacts the slurry sprayed from the cooling absorption spray layer 131, and the flue gas temperature is reduced to its saturation temperature of 60-70°C, creating the best temperature conditions for the absorption reaction; at the same time, the slurry reacts with the acidic gas in the flue gas to generate Na 2 SO 3 、Na 2 SO 4 , NaCl, NaF and other salts;

[0046] Step 2: The slurry after the reaction is collected in the slurry pool 11 at the bottom of the wet tower 1, and then sent to the cooling absorption spray layer 131 by the cooling absorption circulation pump 22 for circulation spraying; the flue gas with most of the acid gas is removed, and the droplets in the saturated flue gas are removed by the cooling absorption part demister 132, and then enters the cooling and dehumidification part 14 upward;

[0047] Step 3: a first measuring pipe 42 is provided at the outlet pipe 212 of the cooling absorption circulation system, and a salinity meter 44 and a pH meter 45 are provided on the first measuring pipe 42; wherein the salinity meter 44 is used to control the amount of waste liquid discharged from the discharge port 17, and maintain the salinity of the slurry in the slurry pool 1 at 3%-5%; the pH meter 45 is used to detect the pH value of the slurry in the slurry pool 1, and when the pH value of the slurry in the slurry pool 1 is low, the alkali solution delivery pump 41 is started, and alkali is added to the outlet pipe 212 of the cooling absorption circulation system through the first delivery pipe 411, and the alkali solution is sprayed through the nozzle of the cooling absorption spray layer 131 to be evenly mixed with the slurry in the slurry pool 1, and the pH value is controlled to be maintained at about 6;

[0048] Step 4: The flue gas from the cooling absorption section 13 moves upward through the collecting plate 141 and enters the cooling and dehumidifying section 14; the flue gas is further cooled and precipitates some water in contact with the dehumidifying water in the packing layer 142, and the dehumidified flue gas passes through the cooling and dehumidifying section demister 144 to further remove droplets, and then enters the subsequent low-temperature SCR denitrification system from the top of the wet tower 1;

[0049] Step 5: The dehumidification water in the dehumidification water tank 32 is sent to the dehumidification spray layer by the dehumidification circulation pump 33, and is sprayed downward to the packing layer 142 through the nozzle of the dehumidification spray layer 143, and is fully in contact with the flue gas; the dehumidification water is collected by the collection plate 141 and returned to the dehumidification water tank 32, and is further cooled by the dehumidification liquid heat exchanger 34 and then recycled.

[0050] Step 6: a second measuring pipe 43 is provided at the outlet pipe 312 of the dehumidification circulation system, and a pH meter 45 is provided on the second measuring pipe 43; when the pH value of the slurry in the dehumidification water tank 32 is acidic, the alkali solution delivery pump 41 is started, and alkali is added to the outlet pipe 312 of the dehumidification circulation system through the second delivery pipe 412, and the alkali solution is sprayed through the nozzle of the dehumidification spray layer 143 and evenly mixed with the slurry in the collection plate 141, and the pH value is controlled to be maintained at about 7;

[0051] Step 7: An emergency sprinkler system 5 is set at the inlet flue 16. When the operating smoke temperature in the wet tower 1 exceeds the design value, the emergency sprinkler 52 is automatically started, and the water in the high-placed emergency water tank 51 is sprayed into the wet tower smoke inlet 12 through the nozzle using the gravity difference, reducing the smoke temperature to below the design value, effectively protecting the internal components of the wet tower 1.

[0052] Step 8: The flushing water from the flushing water system 6 can replenish the high-mounted emergency water tank 51 and flush the wet tower 1, the cooling absorption part demister 132, the cooling and dehumidification part demister 144, the first measuring pipe 42 and the second measuring pipe 43.

[0053] Other parts not described belong to the prior art.

Claims

1. An optimized wet system for waste incineration flue gas purification, characterized in that: The invention comprises a wet process tower (1), a cooling absorption circulation system (2), a dehumidification circulation system (3) and an alkali solution addition and slurry measurement system (4), wherein the wet process tower (1) is provided with a slurry pool (11), a wet process tower flue gas inlet (12), a cooling absorption part (13), a cooling and dehumidification part (14) and a wet process tower flue gas outlet (15) in sequence from bottom to top; The wet tower flue gas inlet (12) is connected to the inlet flue (16); The cooling absorption part (13) is provided with a cooling absorption spray layer (131) and a cooling absorption part demister (132) in sequence from bottom to top; The cooling and dehumidifying section (14) is provided with a collecting plate (141), a packing layer (142), a dehumidifying spray layer (143), and a cooling and dehumidifying section demister (144) in sequence from bottom to top; One end of the cooling absorption circulation system (2) is connected to the slurry pool (11) via a cooling absorption circulation system inlet pipe (211), and the other end is connected to the cooling absorption spray layer (131) via a cooling absorption circulation system outlet pipe (212); One end of the dehumidification circulation system (3) is connected to the collection plate (141) via a dehumidification circulation system inlet pipe (311), and the other end is connected to the dehumidification spray layer (143) via a dehumidification circulation system outlet pipe (312); The alkali solution addition and slurry measurement system (4) comprises an alkali solution delivery pump (41), wherein the alkali solution delivery pump (41) is connected to the cooling absorption circulation system outlet pipeline (212) via a first delivery pipeline (411), and the alkali solution delivery pump (41) is connected to the dehumidification circulation system outlet pipeline (312) via a second delivery pipeline (412).

2. The optimized wet system for purifying flue gas from waste incineration according to claim 1 is characterized in that: The cooling absorption circulation system (2) comprises a cooling absorption circulation pump (22); one end of the cooling absorption circulation system inlet pipe (211) is connected to the bottom side of the slurry pool (11), and the other end is connected to the inlet of the cooling absorption circulation pump (22); one end of the cooling absorption circulation system outlet pipe (212) is connected to the outlet of the cooling absorption circulation pump (22), and the other end is connected to the cooling absorption spray layer (131).

3. The optimized wet system for purifying waste incineration flue gas according to claim 2 is characterized in that: The dehumidification circulation system (3) comprises a dehumidification water tank (32), a dehumidification circulation pump (33), and a dehumidification liquid heat exchanger (34); the collection tray (141) is connected to the dehumidification water tank (32); one end of the dehumidification circulation pump (33) is connected to the bottom side of the dehumidification water tank (32) through a dehumidification circulation system inlet pipe (311), and the other end is connected to the dehumidification liquid heat exchanger (34) through a dehumidification circulation system outlet pipe (312); and the dehumidification liquid heat exchanger (34) is connected to the dehumidification spray layer (143).

4. The optimized wet system for purifying waste incineration flue gas according to claim 3 is characterized in that: The alkali solution addition and slurry measurement system (4) also includes a first measurement pipeline (42) and a second measurement pipeline (43); the first measurement pipeline (42) is connected to the outlet pipeline (212) of the cooling absorption circulation system, and a salinity meter (44) and a pH meter (45) are arranged on the first measurement pipeline (42); the second measurement pipeline (43) is connected to the outlet pipeline (312) of the dehumidification circulation system, and a pH meter (45) is arranged on the second measurement pipeline (43).

5. The optimized wet system for purifying waste incineration flue gas according to claim 4 is characterized in that: It also includes an emergency sprinkler system (5), the emergency sprinkler system (5) including a high-mounted emergency water tank (51) and an emergency sprinkler device (52), the bottom side of the high-mounted emergency water tank (51) is connected to the emergency sprinkler device (52), and the emergency sprinkler device (52) is arranged in the inlet flue (16).

6. The optimized wet system for purifying waste incineration flue gas according to claim 5 is characterized in that: The invention also includes a flushing water system (6), wherein the flushing water system (6) is connected to the wet tower (1) via a first flushing pipe (61), the flushing water system (6) is connected to the cooling absorption part demister (132) via a second flushing pipe (62), the flushing water system (6) is connected to the cooling and dehumidifying part demister (144) via a third flushing pipe (63), the flushing water system (6) is connected to the first measuring pipe (42) via a fourth flushing pipe (64), the flushing water system (6) is connected to the second measuring pipe (43) via a fifth flushing pipe (65), and the flushing water system (6) is connected to the high-mounted emergency water tank (51) via a sixth flushing pipe (66).

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