Waste incineration flue gas treatment system

Abstract

The utility model provides a waste incineration flue gas treatment system which comprises a dry-type deacidification and dust removal unit, a wet-type deacidification device, an oxidizing agent spraying device, a condensing device, a CO2 trapping device, a fly ash chelating and solidifying unit, a compression drying and liquefying unit and the like, and flue gas discharged from the dry-type deacidification and dust removal unit is in contact with an oxidizing agent and then enters the wet-type deacidification device; flue gas discharged from the wet-type deacidification device is condensed and cooled by the condensing device and then enters the trapping device, and condensed water discharged from the condensing device is used as cooling water replenishing water of the trapping device and replenishing water and flushing water of the wet-type deacidification device. Concentrated water separated from wastewater discharged from the wet deacidification device is used as water for preparing a deacidification agent and auxiliary water for a chelating and curing process, and part of CO2 gas discharged from the trapping device is used as auxiliary gas for the chelating and curing process. By means of the system, cleaner flue gas emission can be achieved, CO2 can be efficiently captured with low energy consumption, and high-concentration CO2 and high-strength chelated solidified bodies can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of waste incineration flue gas treatment, and in particular to a waste incineration flue gas treatment system. Background Art

[0002] There is N in the flue gas from garbage incineration 2 , O 2 , CO 2 , dust, hydrochloric acid, sulfur oxides, nitrogen oxides, dioxins and other components.

[0003] Some waste incineration flue gas treatment systems remove acidic gases from waste incineration flue gas by circulating alkaline solution spraying. However, NO and N in waste incineration flue gas 2 O These nitrogen oxides cannot react directly with alkali solution, resulting in NO and N in the exhaust gas. 2 The O content is high and not environmentally friendly.

[0004] Some waste incineration flue gas treatment systems remove CO from waste incineration flue gas. 2 The captured gas is then stored or reused to generate a higher negative carbon value. Some waste incineration flue gas treatment systems combine oxygen-enriched incineration processes to achieve CO 2 The capture and oxygen-enriched incineration process requires an air separation unit, which consumes a lot of power (usually 0.6-0.7KW / Nm 3 O 2 ), resulting in high energy consumption of the system. In addition, the oxygen-enriched incineration process will also lead to unstable combustion conditions in the incinerator and poor heat exchange effect after the incinerator.

[0005] In view of this, how to improve the waste incineration flue gas treatment system is a technical problem that needs to be solved by technical personnel in this field. Utility Model Content

[0006] In order to solve the above technical problems, the present application provides a waste incineration flue gas treatment system, the waste incineration flue gas treatment system comprising:

[0007] A dry deacidification and dust removal unit, the dry deacidification and dust removal unit comprising a dry deacidification tower and a dust removal device connected downstream of the dry deacidification tower;

[0008] A wet deacidification device, the wet deacidification device comprising a wet deacidification tower connected downstream of the dust removal device;

[0009] The oxidant injection device is used to inject oxidant into the flue gas, and the injection position of the oxidant injection device is located between the wet deacidification tower and the dust removal device.

[0010] Optionally, the waste incineration flue gas treatment system comprises:

[0011] A condensing device, the condensing device comprising a flue gas condenser connected downstream of the wet deacidification tower;

[0012] A capture device for capturing CO in flue gas 2 The capture device includes an absorption tower connected to the downstream of the flue gas condenser, a desorption tower connected to the absorption tower, and a gas-liquid separator connected to the desorption tower.

[0013] Optionally, the wet deacidification tower is connected to the condensation device, so that the condensed water discharged from the condensation device can pass into the wet deacidification tower.

[0014] Optionally, the capture device includes a cooling tower and multiple coolers, the cooling water of the multiple coolers all comes from the cooling tower, and the cooling tower is connected to the condensing device so that the condensed water discharged from the condensing device can pass into the cooling tower.

[0015] Optionally, the multiple coolers include: a washing liquid cooler connected between the water collecting structure and the water distribution structure of the washing filler in the absorption tower, an absorption liquid cooler connected between the water collecting structure of the upper-level absorption filler and the water distribution structure of the lower-level absorption filler in the absorption tower, a lean liquid cooler connected between the absorption tower and the analysis tower, and a mixed gas cooler connected between the analysis tower and the gas-liquid separator.

[0016] Optionally, the capture device comprises a heater connected downstream of the absorption tower.

[0017] Optionally, the wet deacidification device comprises a wastewater tank, which is connected to the wet deacidification tower to receive the wastewater discharged from the wet deacidification tower and return the clean water separated from the wastewater to the wet deacidification tower;

[0018] Optionally, the dry deacidification and dust removal unit includes a deacidification agent preparation and injection device, and the deacidification agent preparation and injection device is connected to the wastewater tank to prepare the deacidification agent using concentrated water separated from the wastewater.

[0019] Optionally, the waste incineration flue gas treatment system includes: a fly ash chelating and solidifying unit, the fly ash chelating and solidifying unit includes a fly ash silo, a cement supply device, a chelating agent supply device, a mixing and stirring device and a molding and curing device, the fly ash silo is connected to the dry deacidification tower and the dust removal device to receive the deacidification product discharged from the dry deacidification tower and the dust discharged from the dust removal device, the cement supply device, the chelating agent supply device, the fly ash silo, the CO capture device 2 The gas outlet and the waste water tank are both connected to the mixing and stirring device to separate cement, chelating agent, deacidification product and dust, CO 2Gas and concentrated water are supplied into the mixing and stirring device, and the mixing and stirring device is connected to the molding and curing device so as to supply the stirred mixture into the molding and curing device.

[0020] Optionally, the waste incineration flue gas treatment system comprises: a compression drying and liquefaction unit, the compression drying and liquefaction unit and the CO capture device 2 Gas outlet connected.

[0021] This application has the following technical effects:

[0022] 1. It can remove elemental mercury and N in flue gas. 2 O or NO, so cleaner flue gas emissions can be obtained.

[0023] 2. It can be combined with conventional garbage combustion process instead of adopting oxygen-enriched combustion process, thus avoiding the disadvantages of oxygen-enriched combustion process such as high power consumption, unstable combustion and deteriorated heat exchange;

[0024] 3. Capture CO efficiently with low energy consumption 2 , can obtain high concentration CO 2 ;

[0025] 4. Capable of fixing CO 2 , and can obtain high-strength garbage fly ash chelate solidified body;

[0026] 5. It can alleviate or avoid the generation of white smoke during emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of an embodiment of a waste incineration flue gas treatment system provided in this application.

[0028] The following are the descriptions of the reference numerals:

[0029] 1 dry deacidification and dust removal unit, 11 dry deacidification tower, 12 dust removal device, 13 deacidification agent preparation injection device, 14 activated carbon injection device;

[0030] 2. Oxidant injection device;

[0031] 3 wet deacidification device, 31 wet deacidification tower, 32 alkali adding device, 33 demister, 34 demister flushing pump, 35 packing layer, 36 spray layer, 37 circulation pump, 38 waste water tank;

[0032] 4 condensing device, 41 flue gas condenser, 42 condensing water tank;

[0033] 5 capture device, 51 absorption tower, 52 analysis tower, 53 gas-liquid separator, 54 cooling tower, 55 demister, 56 washing filler, 57 main absorption filler, 58 lower absorption filler, 59 washing liquid cooler, 510 washing pump, 511 absorption liquid cooler, 512 heater, 513 demister, 514 upper analysis filler, 515 lower analysis filler, 516 rich liquid pump, 517 lean and rich liquid heat exchanger, 518 lean liquid pump, 519 lean liquid cooler, 520 reboiler, 521 mixed gas cooler;

[0034] 6 fly ash chelating and solidifying unit, 61 fly ash silo, 62 cement supply device, 63 chelating agent supply device, 64 mixing and stirring device, 65 molding and curing device;

[0035] 7Compression drying liquefaction unit;

[0036] 8 induced draft fan;

[0037] 9Chimney. DETAILED DESCRIPTION

[0038] The present application provides a waste incineration flue gas treatment system. In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] First of all, it should be noted that the “upstream” and “downstream” mentioned in this application are all referring to the waste incineration flue gas, that is, the area through which the waste incineration flue gas flows first is the upstream, and the area through which it flows later is the downstream.

[0040] like Figure 1 As shown, the waste incineration flue gas treatment system provided in the present application includes: a dry deacidification and dust removal unit 1, an oxidant injection device 2 and a wet deacidification device 3.

[0041] The dry deacidification and dust removal unit includes a dry deacidification tower 11 and a dust removal device 12 connected downstream of the dry deacidification tower.

[0042] The wet deacidification device includes a wet deacidification tower 31 connected downstream of the dust removal device.

[0043] The oxidant injection device is used to inject oxidant into the flue gas, and the injection position of the oxidant injection device is located between the wet deacidification tower and the dust removal device.

[0044] When the above waste incineration flue gas treatment system is working, the waste incineration flue gas (hereinafter referred to as flue gas) first flows through the dry deacidification and dust removal unit. At this stage, most of the acidic gases and dust in the flue gas are removed. After the flue gas is discharged from the dry deacidification and dust removal unit, it contacts the oxidant injected by the oxidant injection device. At this stage, the elemental mercury and N in the flue gas are 2 O and NO are converted into divalent mercury and NO2 、N 2 O 4 Then, the flue gas flows through the wet deacidification device and contacts with the alkali solution sprayed in the wet deacidification tower. At this stage, the residual dust (including the aforementioned divalent mercury) and acidic gases (including the aforementioned NO 2 、N 2 O 4 ) is further removed and the flue gas temperature is reduced (to near saturation).

[0045] The above waste incineration flue gas treatment system can remove elemental mercury, N 2 O, NO and other pollutants, so cleaner flue gas emissions can be obtained, improving environmental protection.

[0046] Specifically, the dry deacidification and dust removal unit also includes a deacidification agent preparation and injection device 13, which is used to spray the deacidification agent into the dry deacidification tower. The deacidification agent evaporates in the dry deacidification tower. When the flue gas flows through the dry deacidification tower, it fully contacts and reacts with the evaporated deacidification agent in the tower, so that most of the acid gases in the flue gas are removed.

[0047] Specifically, the dry deacidification and dust removal unit also includes an activated carbon injection device 14, which is used to inject activated carbon into the flue gas. The injection position of the activated carbon injection device is located between the dry deacidification tower and the dust removal device. The activated carbon can absorb harmful substances such as heavy metals and dioxins in the flue gas.

[0048] Specifically, the dust removal device may be a bag dust removal device. When the flue gas flows through the dust removal device, most of the dust in the flue gas and the activated carbon adsorbed with harmful substances such as heavy metals and dioxins are removed.

[0049] Specifically, an induced draft fan 8 may be provided between the wet deacidification device and the dust removal device to provide power for the flow of the flue gas.

[0050] Specifically, the wet deacidification device also includes an alkali adding device 32 for adding alkali to the wet deacidification tower. A demister 33 is provided in the wet deacidification tower, and a demister flushing pump 34 for pumping flushing water to the demister can also be configured. At least one packing layer 35 and at least one spray layer 36 for spraying alkali solution are provided below the demister in the wet deacidification tower. In the figure, three spray layers are provided, and a packing layer is provided below each spray layer. The spray layer is connected to the bottom liquid accumulation area of ​​the wet deacidification tower through a circulating pump 37. When working, the alkali solution accumulated at the bottom of the wet deacidification tower is pressurized by the circulating pump and pumped to the spray layer, thereby realizing the circulation spraying of the alkali solution. When the flue gas flows through the wet deacidification tower, it is fully contacted with the sprayed alkali solution to achieve deacidification, dust removal and cooling. After deacidification, dust removal and cooling, the carried droplets are removed by the demister to obtain clean saturated gas (temperature is about 55°C-65°C).

[0051] Specifically, the salinity and turbidity of the liquid in the wet deacidification tower will increase as the deacidification and dust removal proceeds. Therefore, during the operation, it is necessary to discharge some wastewater with high salinity and turbidity and replenish clean water with low salinity and turbidity. Therefore, the wet deacidification device also includes a wastewater tank 38, which is connected to the wet deacidification tower to receive the wastewater discharged from the wet deacidification tower. The wastewater is separated into clean water and concentrated water in the wastewater tank. The clean water returns to the wet deacidification tower.

[0052] Specifically, the wastewater tank can be connected to the deacidification agent preparation and injection device of the dry deacidification and dust removal unit to prepare the deacidification agent using the concentrated water separated from the wastewater. In this way, harmful substances in the concentrated water can be removed as salts in the dry deacidification tower.

[0053] Specifically, the wastewater tank can be connected to the fly ash chelating solidification unit 6 to utilize the concentrated water separated from the wastewater as auxiliary water for the chelating solidification process. The structure and working principle of the fly ash chelating solidification unit are described in detail below.

[0054] Further, such as Figure 1 As shown, the waste incineration flue gas treatment system provided in the present application may also include a condensing device 4 and a device for capturing CO in the flue gas. 2 Capture device 5.

[0055] The condensing device includes a flue gas condenser 41 connected to the downstream of the wet deacidification tower. When the flue gas flows through the flue gas condenser, it exchanges heat with the cooling water introduced into the flue gas condenser, thereby cooling down, condensing and discharging the condensed water.

[0056] The capture device includes an absorption tower 51 connected to the downstream of the flue gas condenser, a desorption tower 52 connected to the absorption tower, and a gas-liquid separator 53 connected to the desorption tower. When working, an absorption liquid is introduced into the absorption tower. The absorption liquid can be an organic amine liquid. When the flue gas flows through the absorption tower, the absorption liquid absorbs CO in the flue gas. 2 , then, absorbs CO 2 The absorption liquid enters the analysis tower, where the mixed gas (including water vapor and CO 2 ), then the analyzed mixed gas enters the cooler and gas-liquid separator to separate the high-concentration CO 2 .

[0057] This arrangement ensures that the flue gas has been cooled twice in the wet deacidification device and the flue gas condenser before it flows through the absorption tower. Therefore, the flue gas has a lower temperature (for example, 40°C) when it flows through the absorption tower, thereby meeting the temperature requirement for efficient absorption of the absorption liquid and enabling the absorption liquid to efficiently absorb CO. 2 , thus at low CO 2 High concentration CO can be obtained even under high concentration flue gas conditions 2 .

[0058] Specifically, the condensing device may include a condensing water tank 42 for buffering the condensed water discharged from the flue gas condenser.

[0059] Specifically, the condensation device can be connected to the wet deacidification device, specifically can be connected to the drain outlet of the condensation water tank, so that the condensed water discharged from the condensation device can pass into the wet deacidification tower to serve as supplementary water for the wet deacidification tower and flushing water for the demister.

[0060] Specifically, the capture device may further include a cooling tower 54, and the condensing device may be connected to the cooling tower, specifically, may be connected to the drain port of the condensing water tank, so that the condensed water discharged from the condensing device can be passed into the cooling tower to be used as supplementary water for the cooling tower (since the cooling tower adopts open cooling, water needs to be evaporated to reduce the circulating water temperature, so water supplementation is required). In this way, the condensed water discharged from the condensing device is used as the cooling water supplement for the capture device, which reduces the water consumption of the capture device, thereby obtaining high-concentration CO with lower water consumption. 2 .

[0061] Specifically, a demister 55 is provided in the absorption tower of the capture device. A washing filler 56 is provided below the demister in the absorption tower. At least one level of absorption filler is provided below the washing filler in the absorption tower. In the figure, two levels of absorption filler are provided, which are the main absorption filler 57 and the lower absorption filler 58 from top to bottom. Liquid distribution structures and liquid collection structures are provided above and below the washing filler and each level of absorption filler. During operation, the flue gas enters the lower part of the absorption tower, and the absorption liquid enters the tower from between the liquid distribution structures of the main absorption filler and the washing filler. When the flue gas flows upward through the lower absorption filler and the main absorption filler, it is fully in contact with the absorption liquid, so that CO in the flue gas is 2 The flue gas is selectively absorbed into the absorption liquid, and the flue gas fully contacts with the washing liquid when flowing upward through the washing filler, so that the absorption liquid carried in the flue gas is removed by the washing liquid. After that, the flue gas is defoamed by the demister and discharged into the chimney 9, and finally discharged into the atmosphere from the chimney 9.

[0062] Specifically, the liquid collecting structure of the washing filler and the liquid distributing structure of the washing filler can be connected to the washing liquid cooler 59 and the washing pump 510. During operation, the collected washing liquid is pressurized by the washing pump and then enters the cooling water in the washing liquid cooler for heat exchange cooling, and then returns to the tower after cooling. In this way, the washing liquid has the effect of cooling the flue gas, so that the flue gas temperature at the process outlet is controlled, and a relatively stable water balance is indirectly obtained. At the same time, washing also prevents the flue gas from carrying the absorption liquid into the atmosphere. The cooling water in the washing liquid cooler 59 comes from the above-mentioned cooling tower.

[0063] Specifically, an absorption liquid cooler 511 can be connected between the liquid collecting structure of the next-level absorption filler and the liquid distributing structure of the previous-level absorption filler. In the figure, an absorption liquid cooler is connected between the liquid collecting structure of the main absorption filler and the liquid distributing structure of the lower absorption filler. During operation, the absorption liquid flowing through the main filler is collected and cooled in the absorption liquid cooler, and then returns to the tower after cooling, and then flows through the lower filler to reach the bottom of the tower. In this way, the absorption efficiency is higher after the absorption liquid temperature is reduced, which is conducive to obtaining higher CO 2 Capture efficiency. The cooling water in the absorption liquid cooler 511 comes from the above-mentioned cooling tower.

[0064] Specifically, the downstream of the absorption tower of the capture device can be connected to a heater 512, and the heater is connected between the flue gas outlet of the absorption tower and the chimney. In this way, the flue gas is heated by the heater before entering the chimney, and can eventually be discharged into the atmosphere from the chimney in the form of dry flue gas, thereby avoiding the impact of white smoke on the ecological environment when discharged into the atmosphere. The heater can use low-pressure steam that has been generated by a certain amount of work by the unit turbine as a heating medium.

[0065] Specifically, a degassing device 513 is provided in the degassing tower of the capture device. At least one level of degassing filler is provided below the degassing device in the degassing tower. Two levels of degassing fillers are provided in the figure, which are upper level degassing filler 514 and lower level degassing filler 515 from top to bottom. A rich liquid passage and a lean liquid passage are connected between the degassing tower and the absorption tower. A rich liquid pump 516 is connected to the rich liquid passage, a lean liquid pump 518 and a lean liquid cooler 519 are connected to the lean liquid passage, and a lean-rich liquid heat exchanger 517 is connected to the rich liquid passage and the lean liquid passage. When working, CO2-rich 2 The absorbed liquid (called rich liquid) is pressurized by the rich liquid pump from the bottom of the absorption tower and sent to the lean-rich liquid heat exchanger. The rich liquid and the lean liquid discharged from the bottom of the desorption tower are heated in the lean-rich liquid heat exchanger and then enter the upper part of the desorption tower. In the desorption tower, the rich liquid and the rising hot steam are fully contacted when flowing through the desorption packing, so that the mixed gas (water vapor and CO) is decomposed from the rich liquid. 2 ), the rich liquid is turned into lean liquid, the lean liquid is pressurized by the lean liquid pump from the bottom of the analysis tower and sent to the lean-rich liquid heat exchanger, the lean liquid and the rich liquid are heat exchanged and cooled in the lean-rich liquid heat exchanger, then enter the lean liquid cooler to exchange heat with cooling water for further cooling, and then enter the absorption tower. The cooling water in the lean liquid cooler comes from the above cooling tower.

[0066] Specifically, the bottom of the desorption tower of the capture device can be connected to the reboiler 520. During operation, part of the desorbed absorption liquid reaches the bottom of the desorption tower and is further desorbed after being heated by the reboiler. The reboiler can use low-pressure steam from the unit steam turbine that has been used for power generation as a heating medium.

[0067] Specifically, the mixed gas outlet of the analysis tower of the capture device is connected to the gas-liquid separator, and a mixed gas cooler 521 can be arranged between the gas-liquid separator and the mixed gas outlet of the analysis tower. During operation, the analyzed mixed gas enters the mixed gas cooler, and after heat exchange with cooling water in the mixed gas cooler and cooling down, enters the gas-liquid separator to separate CO 2 The condensed water discharged from the gas and mixed gas cooler can be returned to the analysis tower, and the separated CO 2 Gas from the CO capture device 2 The cooling water in the mixed gas cooler comes from the above-mentioned cooling tower.

[0068] Further, such as Figure 1 As shown, the waste incineration flue gas treatment system provided in the present application may also include a compression drying liquefaction unit, the compression drying liquefaction unit and the CO capture device 2 The gas outlet is connected so that the CO discharged from the capture device 2 The gas can be discharged to the compression, cooling and liquefaction unit for compression, drying, liquefaction and other processes and then used as gas for other production processes or directly sealed.

[0069] Further, such as Figure 1 As shown, the waste incineration flue gas treatment system provided in the present application may also include a fly ash chelating and solidification unit 6.

[0070] Specifically, the fly ash chelating and solidifying unit includes a fly ash silo 61, a cement supply device 62, a chelating agent supply device 63, a mixing and stirring device 64, and a molding and curing device 65. The fly ash silo is connected to a dry deacidification tower and a dust removal device to receive the deacidification product discharged from the dry deacidification tower and the dust discharged from the dust removal device. The cement supply device, the chelating agent supply device, and the fly ash silo are all connected to the mixing and stirring device to respectively supply cement, chelating agent, deacidification product, and dust into the mixing and stirring device. The mixing and stirring device is connected to the molding and curing device to supply the stirred mixture into the molding and curing device.

[0071] Specifically, the mixing and stirring device is also connected to the CO 2 The gas outlet is connected so that part of the CO discharged by the capture device can be 2 Gas is used as auxiliary gas in the chelation solidification process. In this way, CO 2 , and can also improve the strength of the chelated solid body.

[0072] Specifically, the mixing and stirring device is also connected to the concentrated water outlet of the wastewater tank of the wet deacidification device, so that part of the concentrated water discharged from the wastewater tank can be used as auxiliary water for the chelating solidification process.

[0073] In summary, the waste incineration flue gas treatment system shown in the figure combines dry deacidification and dust removal process, oxidation process, wet deacidification process, condensation process, and chemical absorption and analytical separation process.

[0074] The diagram shows the waste incineration flue gas treatment system working:

[0075] After the flue gas is discharged from the dry deacidification and dust removal unit, it first contacts with the oxidant and then enters the wet deacidification device. This can remove elemental mercury, N 2 O or NO, so cleaner flue gas emissions can be obtained.

[0076] The flue gas discharged from the wet deacidification device is condensed and cooled by the condensing device before entering the capture device. This can ensure that the capture device has a high capture efficiency, so that high-concentration CO 2 .

[0077] The condensed water discharged from the condensing device is used as the supplementary water for the wet deacidification tower of the wet deacidification device and the demister flushing water, and is also used as the cooling water supplement for the capture device, which can reduce the water consumption of the capture device, so that high-concentration CO can be obtained with lower water consumption. 2 .

[0078] The concentrated water separated from the wastewater discharged from the wet deacidification device is used as water for the deacidification agent preparation and auxiliary water for the chelating solidification process. In this way, harmful substances in the concentrated water can be removed in the form of salts.

[0079] Part of the CO discharged from the capture device 2 Gas is used as auxiliary gas in the chelation solidification process, which can fix CO 2 , and a high-strength chelated solid body can be obtained;

[0080] In addition, the system can alleviate or avoid the generation of white smoke during emission. The system can be combined with conventional combustion processes instead of using oxygen-enriched combustion processes, thus avoiding the disadvantages of oxygen-enriched combustion processes such as high power consumption, unstable combustion, and poor heat exchange effects.

[0081] The above specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. Waste incineration flue gas treatment system, characterized in that: The waste incineration flue gas treatment system comprises: A dry deacidification and dust removal unit, the dry deacidification and dust removal unit comprising a dry deacidification tower and a dust removal device connected downstream of the dry deacidification tower; A wet deacidification device, the wet deacidification device comprising a wet deacidification tower connected downstream of the dust removal device; The oxidant injection device is used to inject oxidant into the flue gas, and the injection position of the oxidant injection device is located between the wet deacidification tower and the dust removal device.

2. The waste incineration flue gas treatment system according to claim 1, characterized in that: The waste incineration flue gas treatment system comprises: A condensing device, the condensing device comprising a flue gas condenser connected downstream of the wet deacidification tower; A capture device is used to capture CO2 in flue gas, and the capture device includes an absorption tower connected downstream of the flue gas condenser, a desorption tower connected to the absorption tower, and a gas-liquid separator connected to the desorption tower.

3. The waste incineration flue gas treatment system according to claim 2, characterized in that: The wet deacidification tower is connected to the condensation device so that the condensed water discharged from the condensation device can flow into the wet deacidification tower.

4. The waste incineration flue gas treatment system according to claim 2, characterized in that: The capture device comprises a cooling tower and a plurality of coolers, the cooling water of the plurality of coolers all comes from the cooling tower, and the cooling tower is connected to the condensing device so that the condensed water discharged from the condensing device can pass into the cooling tower.

5. The waste incineration flue gas treatment system according to claim 4, characterized in that: The multiple coolers include: a washing liquid cooler connected between the water collecting structure and the water distributing structure of the washing filler in the absorption tower, an absorption liquid cooler connected between the water collecting structure of the upper-level absorption filler and the water distributing structure of the lower-level absorption filler in the absorption tower, a lean liquid cooler connected between the absorption tower and the analysis tower, and a mixed gas cooler connected between the analysis tower and the gas-liquid separator.

6. The waste incineration flue gas treatment system according to claim 2, characterized in that: The capture device includes a heater connected downstream of the absorption tower.

7. The waste incineration flue gas treatment system according to any one of claims 2 to 6, characterized in that: The wet deacidification device comprises a wastewater tank, which is connected to the wet deacidification tower to receive the wastewater discharged from the wet deacidification tower and return the clean water separated from the wastewater to the wet deacidification tower.

8. The waste incineration flue gas treatment system according to claim 7, characterized in that: The dry deacidification and dust removal unit comprises a deacidification agent preparation and injection device, and the deacidification agent preparation and injection device is connected to the wastewater tank to prepare the deacidification agent using the concentrated water separated from the wastewater.

9. The waste incineration flue gas treatment system according to claim 7, characterized in that: The waste incineration flue gas treatment system comprises: A fly ash chelating and solidifying unit, the fly ash chelating and solidifying unit comprises a fly ash silo, a cement supply device, a chelating agent supply device, a mixing and stirring device and a molding and curing device, the fly ash silo is connected to the dry deacidification tower and the dust removal device to receive the deacidification product discharged from the dry deacidification tower and the dust discharged from the dust removal device, the cement supply device, the chelating agent supply device, the fly ash silo, the CO2 gas outlet of the capture device and the wastewater tank are all connected to the mixing and stirring device to respectively supply cement, chelating agent, deacidification product and dust, CO2 gas and concentrated water into the mixing and stirring device, and the mixing and stirring device is connected to the molding and curing device to supply the stirred mixture into the molding and curing device.

10. The waste incineration flue gas treatment system according to any one of claims 2 to 6, characterized in that: The waste incineration flue gas treatment system comprises: A compression drying and liquefaction unit is connected to the CO2 gas outlet of the capture device.

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