Solid waste incineration flue gas purification device

Abstract

The invention particularly relates to a solid waste incineration flue gas purification device which comprises a heat exchanger (1), a quench tower (2), a dust remover (3), a cooler (4), a steam-water separator (5) and an adsorption device which are sequentially communicated through pipelines. After high-temperature solid waste incineration flue gas is cooled by the heat exchanger (1), rapidly cooled by the quench tower (2), filtered and dedusted by the deduster (3), cooled by the cooler (4) and subjected to gas-liquid separation by the steam-water separator (5), low-temperature solid waste incineration flue gas and flue gas cooling water are obtained; and the low-temperature solid waste incineration flue gas enters the adsorption device to be adsorbed and purified and then is discharged. The solid waste incineration flue gas purification device integrates cooling and low-temperature adsorption functions, can realize integrated removal of various pollutants, and has the advantages of high pollutant removal efficiency, complete removal types, energy conservation, environmental protection, low consumption, low secondary pollution, low investment and small occupied area.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste incineration flue gas purification, and particularly to a solid waste incineration flue gas purification device. Background Art

[0002] The incineration of solid waste generates a large amount of solid waste incineration flue gas. To avoid secondary pollution to the environment, solid waste incineration flue gas needs to be strictly purified to fully remove the pollutants therein before being discharged. The pollutants in solid waste incineration flue gas are mainly acidic gases such as flue gas, sulfur dioxide, nitrogen oxides, hydrogen chloride, as well as carbon monoxide, dioxins and heavy metals, etc. The treatment and control of pollutants in solid waste incineration flue gas are crucial for human health and environmental protection. Moreover, these flue gases often carry high-temperature waste heat. If directly discharged, on the one hand, it will cause a large amount of energy consumption, and on the other hand, it will cause serious pollution to the surrounding environment. Therefore, solid waste incineration flue gas needs to be purified before being discharged.

[0003] Traditional flue gas purification treatment systems usually have functions such as cooling, dust removal, deacidification and denitrification of solid waste incineration flue gas. Traditional flue gas purification treatment processes mainly include SNCR denitrification, deacidification, activated carbon injection for dioxin removal, bag dust removal, waste heat recovery, etc. Although this process can meet the needs to a certain extent, there are still the following deficiencies:

[0004] First, the flue gas is directly denitrified at high temperature and then desulfurized, resulting in low denitrification efficiency;

[0005] Second, the process flow is long, resulting in an increase in system complexity, investment and occupied area;

[0006] Third, process conditions such as temperature and flue gas residence time cannot be accurately controlled, resulting in the pollutant removal effect being difficult to meet expectations;

[0007] Fourth, a large amount of reducing agents such as ammonia or urea and limestone are consumed, and there are problems such as ammonia escape and secondary pollution discharge of desulfurization wastewater. Summary of the Invention

[0008] To solve the above problems, the present invention provides a solid waste incineration flue gas purification device, which integrates cooling and low-temperature adsorption functions, can achieve the integrated removal of multiple pollutants, and has the advantages of high pollutant removal efficiency, complete removal types, energy conservation and environmental protection, less consumption, less secondary pollution, less investment and small floor area.

[0009] To solve the above problems, the present invention provides the following technical solutions:

[0010] A solid waste incineration flue gas purification device, characterized in that it includes a heat exchanger, a quenching tower, a dust collector, a cooler, a steam-water separator and an adsorption device that are connected in sequence through pipelines; the high-temperature solid waste incineration flue gas is cooled by the heat exchanger, rapidly cooled by the quenching tower, filtered and dust-removed by the dust collector, cooled by the cooler and gas-liquid separated by the steam-water separator to obtain low-temperature solid waste incineration flue gas and flue gas cooling water; the low-temperature solid waste incineration flue gas enters the adsorption device for adsorption and purification and then is discharged.

[0011] As one achievable way, the heat exchanger is provided with a tube side and a shell side; the tube side of the heat exchanger is provided with a first flue gas inlet and a first flue gas outlet, and the shell side of the heat exchanger is provided with a first cooling water inlet and a first cooling water outlet; the first flue gas inlet is communicated with the flue.

[0012] The first solid waste incineration flue gas enters the tube side of the heat exchanger from the first flue gas inlet through the flue, and the low-temperature cooling water enters the shell side of the heat exchanger from the first cooling water inlet. The first solid waste incineration flue gas in the tube side of the heat exchanger and the low-temperature cooling water in the shell side of the heat exchanger perform reverse heat exchange. After heat exchange, the first solid waste incineration flue gas in the tube side of the heat exchanger forms the second solid waste incineration flue gas and flows out from the first flue gas outlet; after heat exchange, the low-temperature cooling water in the shell side of the heat exchanger forms high-temperature cooling water and flows out from the first cooling water outlet, and after being cooled by the cooling tower, it forms low-temperature cooling water again and enters the shell side of the heat exchanger from the first cooling water inlet.

[0013] The temperature of the first solid waste incineration flue gas is 800 - 1100 °C, and the temperature of the second solid waste incineration flue gas is 400 - 600 °C.

[0014] As one achievable way, the heat exchanger is a water-cooled tubular heat exchange device.

[0015] As one achievable way, the quenching tower is provided with a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet is communicated with the second flue gas inlet through a pipeline.

[0016] The top of the quenching tower is provided with a nozzle, and the nozzle is provided with a cold water inlet and a cold water outlet; cold water enters the nozzle from the cold water inlet, and the nozzle atomizes the cold water by using compressed air and forms atomized cold water that is evenly sprayed into the quenching tower from the cold water outlet; the second solid waste incineration flue gas enters the quenching tower from the second flue gas inlet.

[0017] The atomized cold water in the quenching tower and the second solid waste incineration flue gas perform rapid heat exchange through sufficient contact. After rapid heat exchange, the atomized cold water forms gaseous water, and after rapid heat exchange, the second solid waste incineration flue gas forms the third solid waste incineration flue gas.

[0018] Gaseous water and the flue gas from the incineration of the third solid waste flow out from the second flue gas outlet together as the flue gas from the incineration of the fourth solid waste; the temperature of the flue gas from the incineration of the third solid waste is 150 - 200 °C, avoiding the temperature range for dioxin formation; the rapid heat exchange time is 0.5 - 1 s.

[0019] As one of the realizable ways, the dust collector is provided with a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is connected to the third flue gas inlet through a pipeline; the flue gas from the incineration of the fourth solid waste enters the dust collector from the third flue gas inlet; the dust collector filters and removes the particulate matter entrained in the flue gas from the incineration of the fourth solid waste, and the flue gas from the incineration of the fifth solid waste flows out from the third flue gas outlet.

[0020] As one of the realizable ways, the dust collector is a bag filter, including a device main body and dust removal filter bags installed in the device main body; talcum powder is pre-coated on the dust removal filter bags before use or before reuse after backwashing.

[0021] As one of the realizable ways, the particulate matter includes dust, fly ash, sticky dust and dioxin.

[0022] As one of the realizable ways, the cooler is provided with a tube side and a shell side; the tube side of the cooler is provided with a fourth flue gas inlet and a fourth flue gas outlet, and the shell side of the cooler is provided with a second cooling water inlet and a second cooling water outlet; the third flue gas outlet is connected to the fourth flue gas inlet through a pipeline;

[0023] The flue gas from the incineration of the fifth solid waste enters the tube side of the cooler from the fourth flue gas inlet, and the low-temperature cooling water enters the shell side of the cooler from the second cooling water inlet. The flue gas from the incineration of the fifth solid waste in the tube side of the cooler and the low-temperature cooling water in the shell side of the cooler conduct reverse heat exchange. After heat exchange, the flue gas from the incineration of the fifth solid waste in the tube side of the cooler forms the flue gas from the incineration of the sixth solid waste and flows out from the fourth flue gas outlet; after heat exchange, the low-temperature cooling water in the shell side of the cooler forms high-temperature cooling water and flows out from the second cooling water outlet, and after being refrigerated by the refrigerator, it forms low-temperature cooling water again and enters the shell side of the cooler from the second cooling water inlet; the temperature of the flue gas from the incineration of the sixth solid waste is 0 - 5 °C.

[0024] As one of the realizable ways, the gas-liquid separator is provided with a fifth flue gas inlet, a fifth flue gas outlet and a flue gas cooling water discharge port; the fourth flue gas outlet is connected to the fifth flue gas inlet through a pipeline;

[0025] The flue gas from the incineration of the sixth solid waste enters the gas-liquid separator from the fifth flue gas inlet; the gas-liquid separator separates the gas and liquid of the flue gas from the incineration of the sixth solid waste to obtain the flue gas from the incineration of the seventh solid waste and flue gas cooling water;

[0026] The flue gas from the incineration of the seventh solid waste flows out from the fifth flue gas outlet; the flue gas cooling water is discharged from the flue gas cooling water discharge port.

[0027] As one of the achievable ways, the adsorption device includes a first adsorption tower, a second adsorption tower, a heating fan, an induced draft fan, and a reductive device for furnace return;

[0028] The first adsorption tower is provided with a sixth flue gas inlet, a sixth flue gas outlet, a first regeneration gas inlet, and a first regeneration gas outlet; the second adsorption tower is provided with a seventh flue gas inlet, a seventh flue gas outlet, a second regeneration gas inlet, and a second regeneration gas outlet; adsorbents are provided in both the first adsorption tower and the second adsorption tower; the induced draft fan is provided with an eighth flue gas inlet and an eighth flue gas outlet; the heating fan is provided with an air inlet and an air outlet;

[0029] The fifth flue gas outlet is respectively communicated with the sixth flue gas inlet and the seventh flue gas inlet through pipelines, and first flue gas valves are provided on the pipeline connecting the fifth flue gas outlet and the sixth flue gas inlet and the pipeline connecting the fifth flue gas outlet and the seventh flue gas inlet; the seventh solid waste incineration flue gas enters the first adsorption tower or the second adsorption tower from the sixth flue gas inlet or the seventh flue gas inlet through the switching of the first flue gas valve, and is alternately adsorbed and purified by the adsorbent in the first adsorption tower or the second adsorption tower to remove acidic gases, carbon monoxide, and heavy metals in the solid waste incineration flue gas, and then the eighth solid waste incineration flue gas is formed;

[0030] The sixth flue gas outlet and the seventh flue gas outlet are respectively communicated with the eighth flue gas inlet through pipelines; second flue gas valves are provided on the pipeline connecting the sixth flue gas outlet and the eighth flue gas inlet and the pipeline connecting the seventh flue gas outlet and the eighth flue gas inlet; the eighth solid waste incineration flue gas flows out from the sixth flue gas outlet or the seventh flue gas outlet through the switching of the second flue gas valve, then enters the induced draft fan from the eighth flue gas inlet, and is discharged from the eighth flue gas outlet;

[0031] The air outlet is respectively communicated with the first regeneration gas inlet and the second regeneration gas inlet through pipelines, and air valves are provided on the pipeline connecting the air outlet and the first regeneration gas inlet and the pipeline connecting the air outlet and the second regeneration gas inlet;

[0032] After the adsorbent in the first adsorption tower or the second adsorption tower is saturated in adsorption, it needs to be alternately heated and regenerated. At this time, low-temperature air enters the heating fan from the air inlet, and the heating fan heats the low-temperature air to form high-temperature air; the high-temperature air flows out from the air outlet, and enters the first adsorption tower or the second adsorption tower from the first regeneration gas inlet or the second regeneration gas inlet through the switching of the air valve to alternately heat and regenerate the adsorbent in the first adsorption tower or the second adsorption tower; after the alternate heating and regeneration of the adsorbent in the first adsorption tower or the second adsorption tower is completed, the low-temperature air enters the first adsorption tower or the second adsorption tower through the heating fan to perform cold blowing on the adsorbent in the first adsorption tower or the second adsorption tower for the next alternate adsorption and purification;

[0033] The first regenerated gas outlet and the second regenerated gas outlet are respectively connected to the reverberatory reduction device through pipelines; gas valves are provided on the pipelines connecting the first regenerated gas outlet to the reverberatory reduction device and the pipelines connecting the second regenerated gas outlet to the reverberatory reduction device; after the high-temperature air alternatively heats and regenerates, pollutant gases are formed; the pollutant gases flow out from the first regenerated gas outlet or the second regenerated gas outlet through the switching of the gas valves and flow to the reverberatory reduction device for reverberatory reduction treatment.

[0034] As one of the realizable ways, the adsorbent is zeolite molecular sieve; the acidic gases include sulfur dioxide, nitrogen oxides, hydrogen chloride and hydrogen fluoride.

[0035] The beneficial technical effects of the present invention:

[0036] The solid waste incineration flue gas purification device of the present invention integrates the functions of cooling and low-temperature adsorption, can realize the integrated removal of various pollutants, and has the advantages of high pollutant removal efficiency, complete removal types, energy conservation and environmental protection, less consumption, less secondary pollution, less investment and small floor area. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of an embodiment of the solid waste incineration flue gas purification device of the present invention.

[0038] In the figure, 1. Heat exchanger; 2. Quench tower; 3. Dust collector; 4. Cooler; 5. Gas-liquid separator; 6. First adsorption tower; 7. Second adsorption tower; 8. Induced draft fan; 9. Heating fan; 101. First flue gas inlet; 201. First cooling water inlet; 202. First cooling water outlet; 301. Second cooling water inlet; 302. Second cooling water outlet; 401. Flue gas cooling water discharge port; 501. Air inlet; 504. Reverberatory reduction device. Detailed Embodiments

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0040] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0041] In the description of the present invention, unless otherwise clearly specified and defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0043] Terms such as "first", "second", "third", etc. are only used to distinguish elements with similar attributes, rather than indicating or implying relative importance or a specific order.

[0044] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to including the listed elements, it may also include other elements not specifically listed.

[0045] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and specific embodiments.

[0046] See Figure 1 , this embodiment provides a solid waste incineration flue gas purification device, which includes a heat exchanger 1, a quench tower 2, a dust collector 3, a cooler 4, a steam-water separator 5 and an adsorption device that are connected in sequence through pipelines; the high-temperature solid waste incineration flue gas passes through the heat exchanger for cooling, the quench tower for rapid cooling, the dust collector for filtering and dust removal, the cooler for cooling, and the steam-water separator for gas-liquid separation to obtain low-temperature solid waste incineration flue gas and flue gas cooling water; the low-temperature solid waste incineration flue gas enters the adsorption device for adsorption purification and then is discharged.

[0047] In this embodiment, as one possible implementation method, the heat exchanger 1 is provided with a tube side and a shell side; the tube side of the heat exchanger 1 is provided with a first flue gas inlet 101 and a first flue gas outlet, and the shell side of the heat exchanger 1 is provided with a first cooling water inlet 201 and a first cooling water outlet 202; the first flue gas inlet 101 is communicated with the flue.

[0048] The first solid waste incineration flue gas enters the tube side of the heat exchanger 1 through the flue from the first flue gas inlet 101. The low-temperature cooling water enters the shell side of the heat exchanger 1 from the first cooling water inlet 201. The first solid waste incineration flue gas in the tube side of the heat exchanger 1 and the low-temperature cooling water in the shell side of the heat exchanger 1 perform countercurrent heat exchange. After heat exchange, the first solid waste incineration flue gas forms the second solid waste incineration flue gas and flows out from the first flue gas outlet; after heat exchange, the low-temperature cooling water in the shell side of the heat exchanger 1 forms high-temperature cooling water and flows out from the first cooling water outlet 202, and after being cooled by the cooling tower, it forms low-temperature cooling water again and enters the shell side of the heat exchanger 1 from the first cooling water inlet 201;

[0049] The temperature of the first solid waste incineration flue gas is 800 - 1100 °C, and the temperature of the second solid waste incineration flue gas is 400 - 600 °C.

[0050] In this embodiment, as one of the realizable ways, the heat exchanger 1 is a water-cooled tubular heat exchange device.

[0051] In this embodiment, as one of the realizable ways, the quench tower 2 is provided with a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet is communicated with the second flue gas inlet through a pipeline;

[0052] The top of the quench tower 2 is provided with a nozzle, and the nozzle is provided with a cold water inlet and a cold water outlet; cold water enters the nozzle from the cold water inlet, and the nozzle atomizes the cold water by using compressed air and forms atomized cold water and evenly sprays it into the quench tower 2 from the cold water outlet; the second solid waste incineration flue gas enters the quench tower 2 from the second flue gas inlet;

[0053] The atomized cold water in the quench tower 2 and the second solid waste incineration flue gas perform rapid heat exchange through sufficient contact. After rapid heat exchange, the atomized cold water forms gaseous water, and after rapid heat exchange, the second solid waste incineration flue gas forms the third solid waste incineration flue gas;

[0054] The gaseous water and the third solid waste incineration flue gas together flow out as the fourth solid waste incineration flue gas from the second flue gas outlet; the temperature of the third solid waste incineration flue gas is 150 - 200 °C, avoiding the dioxin formation temperature zone; the rapid heat exchange time is 0.5 - 1 s.

[0055] In this embodiment, as one of the realizable ways, the dust collector 3 is provided with a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is communicated with the third flue gas inlet through a pipeline; the fourth solid waste incineration flue gas enters the dust collector 3 from the third flue gas inlet; the dust collector 3 filters and removes the particulate matter entrained in the fourth solid waste incineration flue gas, and forms the fifth solid waste incineration flue gas and flows out from the third flue gas outlet.

[0056] In this embodiment, as one of the realizable ways, the dust collector 3 is a bag filter, including the equipment main body and the dust removal filter bags installed in the equipment main body;

[0057] To prevent the sticky dust in the flue gas from the incineration of the fourth solid waste from sticking and blocking the dust removal filter bag, and at the same time considering the adsorption and purification of dioxins that may exist in the flue gas from the incineration of the fourth solid waste, talcum powder pre-coating is carried out on the dust removal filter bag before use or before reusing after backwashing.

[0058] In this embodiment, as one of the achievable ways, the particulate matter includes dust, fly ash, sticky dust and dioxins.

[0059] The flue gas pollutants have good removal effects when adsorbed and removed under low-temperature conditions. Therefore, the flue gas from the incineration of the fifth solid waste flowing out of the dust collector 3 enters the cooler 4 for further cooling.

[0060] In this embodiment, as one of the achievable ways, the cooler 4 is provided with a tube side and a shell side; the tube side of the cooler 4 is provided with a fourth flue gas inlet and a fourth flue gas outlet, and the shell side of the cooler 4 is provided with a second cooling water inlet 301 and a second cooling water outlet 302; the third flue gas outlet is communicated with the fourth flue gas inlet through a pipeline;

[0061] The flue gas from the incineration of the fifth solid waste enters the tube side of the cooler from the fourth flue gas inlet, and the low-temperature cooling water enters the shell side of the cooler 4 from the second cooling water inlet 301. The flue gas from the incineration of the fifth solid waste on the tube side of the cooler 4 and the low-temperature cooling water on the shell side of the cooler 4 perform countercurrent heat exchange. After heat exchange, the flue gas from the incineration of the fifth solid waste on the tube side of the cooler 4 forms the flue gas from the incineration of the sixth solid waste and flows out from the fourth flue gas outlet; after heat exchange, the low-temperature cooling water on the shell side of the cooler 4 forms high-temperature cooling water and flows out from the second cooling water outlet 302, and after being refrigerated by the refrigerator, it forms low-temperature cooling water again and enters the shell side of the cooler 4 from the second cooling water inlet 301; the temperature of the flue gas from the incineration of the sixth solid waste is 0 - 5 °C.

[0062] In this embodiment, as one of the achievable ways, the gas-liquid separator 5 is provided with a fifth flue gas inlet, a fifth flue gas outlet and a flue gas cooling water discharge port 401; the fourth flue gas outlet is communicated with the fifth flue gas inlet through a pipeline;

[0063] The flue gas from the incineration of the sixth solid waste enters the gas-liquid separator 5 from the fifth flue gas inlet; the gas-liquid separator 5 performs gas-liquid separation on the flue gas from the incineration of the sixth solid waste to obtain the flue gas from the incineration of the seventh solid waste and flue gas cooling water;

[0064] The flue gas from the incineration of the seventh solid waste flows out from the fifth flue gas outlet; the flue gas cooling water is discharged from the flue gas cooling water discharge port 401.

[0065] In this embodiment, as one of the achievable ways, the adsorption device includes a first adsorption tower 6, a second adsorption tower 7, a heating fan 9, an induced draft fan 8 and a furnace return reduction device 504;

[0066] The first adsorption tower 6 is provided with a sixth flue gas inlet, a sixth flue gas outlet, a first regeneration gas inlet and a first regeneration gas outlet; the second adsorption tower 7 is provided with a seventh flue gas inlet, a seventh flue gas outlet, a second regeneration gas inlet and a second regeneration gas outlet; adsorbents are provided in both the first adsorption tower 6 and the second adsorption tower 7; the induced draft fan 8 is provided with an eighth flue gas inlet and an eighth flue gas outlet; the heating fan 9 is provided with an air inlet 501 and an air outlet;

[0067] The fifth flue gas outlet is communicated with the sixth flue gas inlet and the seventh flue gas inlet through pipelines respectively, and first flue gas valves are provided on the pipeline connecting the fifth flue gas outlet and the sixth flue gas inlet and the pipeline connecting the fifth flue gas outlet and the seventh flue gas inlet; the seventh solid waste incineration flue gas enters the first adsorption tower 6 or the second adsorption tower 7 from the sixth flue gas inlet or the seventh flue gas inlet through the switching of the first flue gas valve, and is alternately adsorbed and purified by the adsorbent in the first adsorption tower 6 or the second adsorption tower 7 to remove acidic gases such as sulfur dioxide, nitrogen oxides, hydrogen chloride, hydrogen fluoride, etc., as well as carbon monoxide and heavy metals in the solid waste incineration flue gas, and then the eighth solid waste incineration flue gas is formed;

[0068] The sixth flue gas outlet and the seventh flue gas outlet are communicated with the eighth flue gas inlet through pipelines respectively; second flue gas valves are provided on the pipeline connecting the sixth flue gas outlet and the eighth flue gas inlet and the pipeline connecting the seventh flue gas outlet and the eighth flue gas inlet; the eighth solid waste incineration flue gas flows out from the sixth flue gas outlet or the seventh flue gas outlet through the switching of the second flue gas valve, then enters the induced draft fan 8 from the eighth flue gas inlet, and is discharged from the eighth flue gas outlet;

[0069] The air outlet is communicated with the first regeneration gas inlet and the second regeneration gas inlet through pipelines respectively, and air valves are provided on the pipeline connecting the air outlet and the first regeneration gas inlet and the pipeline connecting the air outlet and the second regeneration gas inlet;

[0070] After the adsorbent in the first adsorption tower 6 or the second adsorption tower 7 is saturated in adsorption, it needs to be alternately heated and regenerated. At this time, low-temperature air enters the heating fan 9 from the air inlet 501, and the heating fan 9 heats the low-temperature air to form high-temperature air; the high-temperature air flows out from the air outlet, enters the first adsorption tower 6 or the second adsorption tower 7 from the first regeneration gas inlet or the second regeneration gas inlet through the switching of the air valve, and alternately heats and regenerates the adsorbent in the first adsorption tower 6 or the second adsorption tower 7; after the alternate heating regeneration of the adsorbent in the first adsorption tower 6 or the second adsorption tower 7 is completed, the low-temperature air enters the first adsorption tower 6 or the second adsorption tower 7 through the heating fan 9 to perform cold blowing on the adsorbent in the first adsorption tower 6 or the second adsorption tower 7 for the next alternate adsorption and purification;

[0071] The first regenerated gas outlet and the second regenerated gas outlet are respectively connected to the reverberatory reduction device 504 through pipelines; gas valves are provided on the pipelines connecting the first regenerated gas outlet to the reverberatory reduction device 504 and the pipelines connecting the second regenerated gas outlet to the reverberatory reduction device 504; after the high-temperature air alternately heats and regenerates, pollutant gas is formed; the pollutant gas flows out from the first regenerated gas outlet or the second regenerated gas outlet to the reverberatory reduction device 504 for reverberatory reduction treatment through the switching of the gas valve.

[0072] In this embodiment, as one of the realizable ways, the adsorbent is a zeolite molecular sieve.

[0073] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A solid waste incineration flue gas purification device, characterized in that, It includes a heat exchanger (1), a quench tower (2), a dust collector (3), a cooler (4), a steam-water separator (5) and an adsorption device which are connected in sequence through pipelines; the high-temperature solid waste incineration flue gas is cooled by the heat exchanger (1), rapidly cooled by the quench tower (2), filtered and dust-removed by the dust collector (3), cooled by the cooler (4) and subjected to gas-liquid separation by the steam-water separator (5) to obtain low-temperature solid waste incineration flue gas and flue gas cooling water; the low-temperature solid waste incineration flue gas enters the adsorption device for adsorption purification and then is discharged.

2. The solid waste incineration flue gas purification device according to claim 1, characterized in that, The heat exchanger (1) is provided with a tube side and a shell side; the tube side of the heat exchanger (1) is provided with a first flue gas inlet (101) and a first flue gas outlet, and the shell side of the heat exchanger (1) is provided with a first cooling water inlet (201) and a first cooling water outlet (202); the first flue gas inlet (101) is communicated with the flue. The first solid waste incineration flue gas enters the tube side of the heat exchanger (1) from the first flue gas inlet (101) through the flue, and the low-temperature cooling water enters the shell side of the heat exchanger (1) from the first cooling water inlet (201). The first solid waste incineration flue gas in the tube side of the heat exchanger (1) and the low-temperature cooling water in the shell side of the heat exchanger (1) perform countercurrent heat exchange. After heat exchange, the first solid waste incineration flue gas in the tube side of the heat exchanger (1) forms a second solid waste incineration flue gas and flows out from the first flue gas outlet; after heat exchange, the low-temperature cooling water in the shell side of the heat exchanger (1) forms high-temperature cooling water and flows out from the first cooling water outlet (202), and after being cooled by the cooling tower, it forms low-temperature cooling water again and enters the shell side of the heat exchanger (1) from the first cooling water inlet (201). The temperature of the first solid waste incineration flue gas is 800 - 1100 °C, and the temperature of the second solid waste incineration flue gas is 400 - 600 °C.

3. The solid waste incineration flue gas purification device according to claim 2, characterized in that, The quench tower (2) is provided with a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet is communicated with the second flue gas inlet through a pipeline. The top of the quench tower (2) is provided with a nozzle, and the nozzle is provided with a cold water inlet and a cold water outlet; cold water enters the nozzle from the cold water inlet, and the nozzle atomizes the cold water by using compressed air and forms atomized cold water which is evenly sprayed into the quench tower (2) from the cold water outlet; the second solid waste incineration flue gas enters the quench tower (2) from the second flue gas inlet. The atomized cold water in the quench tower (2) and the second solid waste incineration flue gas perform rapid heat exchange through sufficient contact. After rapid heat exchange, the atomized cold water forms gaseous water, and after rapid heat exchange, the second solid waste incineration flue gas forms a third solid waste incineration flue gas. The gaseous water and the third solid waste incineration flue gas flow out from the second flue gas outlet together as the fourth solid waste incineration flue gas; the temperature of the third solid waste incineration flue gas is 150 - 200 °C, avoiding the dioxin generation temperature zone; the rapid heat exchange time is 0.5 - 1 s.

4. The solid waste incineration flue gas purification device according to claim 3, characterized in that, The dust collector (3) is provided with a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is communicated with the third flue gas inlet through a pipeline; the fourth solid waste incineration flue gas enters the dust collector (3) from the third flue gas inlet; the dust collector (3) filters and removes the particulate matters entrained in the fourth solid waste incineration flue gas to form a fifth solid waste incineration flue gas which flows out from the third flue gas outlet.

5. The solid waste incineration flue gas purification device according to claim 4, characterized in that The dust collector (3) is a bag filter, including the equipment main body and the dust removal filter bags installed in the equipment main body; talcum powder pre - coating is carried out on the dust removal filter bags before use or before reuse after back - blowing; the particulate matter includes dust, fly ash, sticky dust and dioxin.

6. The solid waste incineration flue gas purification device according to claim 4, characterized in that, The cooler (4) is provided with a tube side and a shell side; the tube side of the cooler (4) is provided with a fourth flue gas inlet and a fourth flue gas outlet, and the shell side of the cooler (4) is provided with a second cooling water inlet (301) and a second cooling water outlet (302); the third flue gas outlet is communicated with the fourth flue gas inlet through a pipeline; The fifth solid waste incineration flue gas enters the tube side of the cooler from the fourth flue gas inlet, and the low - temperature cooling water enters the shell side of the cooler (4) from the second cooling water inlet (301). The fifth solid waste incineration flue gas in the tube side of the cooler (4) and the low - temperature cooling water in the shell side of the cooler (4) perform counter - current heat exchange. After heat exchange, the fifth solid waste incineration flue gas in the tube side of the cooler (4) forms the sixth solid waste incineration flue gas and flows out from the fourth flue gas outlet; the low - temperature cooling water in the shell side of the cooler (4) forms high - temperature cooling water after heat exchange and flows out from the second cooling water outlet (302), and after being refrigerated by the refrigerator, it forms low - temperature cooling water again and enters the shell side of the cooler (4) from the second cooling water inlet (301); the temperature of the sixth solid waste incineration flue gas is 0 - 5 °C.

7. The solid waste incineration flue gas purification device according to claim 6, wherein, The gas - liquid separator (5) is provided with a fifth flue gas inlet, a fifth flue gas outlet and a flue gas cooling water discharge port (401); the fourth flue gas outlet is communicated with the fifth flue gas inlet through a pipeline; The sixth solid waste incineration flue gas enters the gas - liquid separator (5) from the fifth flue gas inlet; the gas - liquid separator (5) performs gas - liquid separation on the sixth solid waste incineration flue gas to obtain the seventh solid waste incineration flue gas and flue gas cooling water; The seventh solid waste incineration flue gas flows out from the fifth flue gas outlet; the flue gas cooling water is discharged from the flue gas cooling water discharge port (401).

8. The solid waste incineration flue gas purification device according to claim 7, characterized in that, The adsorption device includes a first adsorption tower (6), a second adsorption tower (7), a heating fan (9), an induced draft fan (8) and a furnace - returning reduction device (504); The first adsorption tower (6) is provided with a sixth flue gas inlet, a sixth flue gas outlet, a first regeneration gas inlet and a first regeneration gas outlet; the second adsorption tower (7) is provided with a seventh flue gas inlet, a seventh flue gas outlet, a second regeneration gas inlet and a second regeneration gas outlet; adsorbents are provided in both the first adsorption tower (6) and the second adsorption tower (7); the induced draft fan (8) is provided with an eighth flue gas inlet and an eighth flue gas outlet; the heating fan (9) is provided with an air inlet (501) and an air outlet; The fifth flue gas outlet is respectively communicated with the sixth flue gas inlet and the seventh flue gas inlet through pipelines, and first flue gas valves are provided on the pipelines connecting the fifth flue gas outlet and the sixth flue gas inlet and the pipeline connecting the fifth flue gas outlet and the seventh flue gas inlet; the seventh solid waste incineration flue gas is switched by the first flue gas valve and enters the first adsorption tower (6) or the second adsorption tower (7) from the sixth flue gas inlet or the seventh flue gas inlet, and is alternately adsorbed and purified by the adsorbent in the first adsorption tower (6) or the second adsorption tower (7) to remove acidic gases, carbon monoxide and heavy metals in the solid waste incineration flue gas, and then forms the eighth solid waste incineration flue gas; The sixth flue gas outlet and the seventh flue gas outlet are respectively connected to the eighth flue gas inlet through pipelines; second flue gas valves are provided in the pipelines connecting the sixth flue gas outlet to the eighth flue gas inlet and the seventh flue gas outlet to the eighth flue gas inlet; the eighth solid waste incineration flue gas flows out from the sixth flue gas outlet or the seventh flue gas outlet after being switched by the second flue gas valve, then enters the induced draft fan (8) from the eighth flue gas inlet, and is discharged from the eighth flue gas outlet; The air outlet is respectively connected to the first regenerated gas inlet and the second regenerated gas inlet through pipelines; air valves are provided in the pipelines connecting the air outlet to the first regenerated gas inlet and the air outlet to the second regenerated gas inlet; After the adsorbent in the first adsorption tower (6) or the second adsorption tower (7) is saturated in adsorption, it needs to be alternately heated and regenerated. At this time, low-temperature air enters the heating fan (9) from the air inlet (501), and the heating fan (9) heats the low-temperature air to form high-temperature air; the high-temperature air flows out from the air outlet, and enters the first adsorption tower (6) or the second adsorption tower (7) from the first regenerated gas inlet or the second regenerated gas inlet after being switched by the air valve, to alternately heat and regenerate the adsorbent in the first adsorption tower (6) or the second adsorption tower (7); after the adsorbent in the first adsorption tower (6) or the second adsorption tower (7) is alternately heated and regenerated, the low-temperature air enters the first adsorption tower (6) or the second adsorption tower (7) through the heating fan (9) to perform cold blowing on the adsorbent in the first adsorption tower (6) or the second adsorption tower (7) for the next alternate adsorption and purification; The first regenerated gas outlet and the second regenerated gas outlet are respectively connected to the furnace return reduction device (504) through pipelines; gas valves are provided in the pipelines connecting the first regenerated gas outlet to the furnace return reduction device (504) and the second regenerated gas outlet to the furnace return reduction device (504); after the high-temperature air is alternately heated and regenerated, pollutant gas is formed; the pollutant gas flows out from the first regenerated gas outlet or the second regenerated gas outlet after being switched by the gas valve to the furnace return reduction device (504) for furnace return reduction treatment.

9. The solid waste incineration flue gas purification device according to claim 8, characterized in that, The adsorbent is a zeolite molecular sieve; the acidic gases include sulfur dioxide, nitrogen oxides, hydrogen chloride, and hydrogen fluoride.

10. The solid waste incineration flue gas purification device according to claim 1, wherein The heat exchanger (1) is a water-cooled shell-and-tube heat exchange device.

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