A waste incineration flue gas treatment system with energy-saving heating

Abstract

The invention discloses a waste incineration flue gas treatment system with energy-saving heating, comprising a flue gas purification system, an ash conveying chain, a fly ash solidification system and a heating system. The flue gas purification system comprises a cooling tower, a bag dust collector, a wet scrubber and an activated carbon adsorption tower. The flue gas purification system also comprises a urea tank and a caustic soda tank. The fly ash solidification system comprises a bucket elevator, a silo top spiral, a fly ash silo, a fly ash spiral and a fly ash solidification chamber. The heating system comprises a heating main pipe, a heating branch pipe and a hot water tank. The heating main pipe and the heating branch pipe are connected. The hot water tank is connected to the heating main pipe. The heating branch pipe exchanges heat with one or more of the urea tank, the caustic soda tank, the cooling tower, the bag dust collector, the ash conveying chain, the bucket elevator, the fly ash silo and the silo top spiral. A steam main pipe is arranged on the heating main pipe. The invention utilizes the waste heat of boiler sewage and steam to maintain the working temperature of the equipment, reduces the loss of electric energy of the system in maintaining the working temperature of the equipment, and has great practicality.

Description

Technical Field

[0001] The invention relates to the technical field of hazardous waste treatment, and more particularly to a waste incineration flue gas treatment system with energy-saving heating. Background Art

[0002] The main equipment of a waste incineration power plant includes an incinerator, a waste heat boiler, a steam turbine, a generator set, a waste incineration flue gas treatment system, an ash conveying chain and a fly ash solidification system. Waste incineration power generation refers to a method of generating electricity by placing waste in an incinerator and burning it. The high-temperature flue gas generated causes the deoxygenated water in the waste heat boiler to form high-temperature steam, and the high-temperature steam drives the steam turbine to drive the generator set to operate and generate electricity. During the incineration process of waste, flue gas and fly ash are generated. Since flue gas and fly ash contain a large amount of heavy metals and dioxins, the flue gas and fly ash need to be treated by the waste incineration flue gas treatment system and the fly ash solidification system until the treated gas meets the relevant standards before it can be discharged.

[0003] The current waste incineration flue gas treatment system usually uses processes such as dry + wet, fly ash chelation solidification landfill, etc. to treat the flue gas and fly ash generated after incineration. The above process requires the use of equipment such as urea tanks, bag filters, fly ash conveying chains, fly ash silos, caustic soda tanks, etc. These equipment need to be kept at a certain working temperature to maintain normal operation. Traditional incineration plants use electric heating to maintain the working temperature of these equipment, but this method consumes additional electricity, which does not meet the purpose of "energy conservation and emission reduction" and the requirements of "sustainable development" of incineration plants. Therefore, the traditional waste incineration flue gas treatment system needs to be improved. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a waste incineration flue gas treatment system with energy-saving heating, which recovers boiler wastewater and part of the steam generated in the power generation process, utilizes the waste heat to maintain the operating temperature of the equipment, and reduces the system's loss of electrical energy in maintaining the operating temperature of the equipment, thereby meeting the purpose of "energy conservation and emission reduction" and the requirements of "sustainable development".

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a waste incineration flue gas treatment system with energy-saving heating, comprising a flue gas purification system, an ash conveying chain, a fly ash solidification system, and a heating system;

[0006] The flue gas purification system includes a cooling tower, a bag filter, a wet scrubber, and an activated carbon adsorption tower from upstream to downstream, and the flue gas purification system also includes a SNCR (selective non-catalytic reduction) system and a caustic soda tank;

[0007] The SNCR system comprises a urea tank and a urea spray gun, wherein the urea spray gun is connected to the urea tank;

[0008] The caustic soda tank is connected to the wet scrubber via a circulating caustic soda pump;

[0009] The fly ash solidification system includes a bucket elevator, a silo top screw, a fly ash silo, a fly ash screw and a fly ash solidification chamber in order from upstream to downstream;

[0010] The ash conveying chain conveys the fly ash discharged from the cooling tower and the bag filter to the bucket elevator;

[0011] The heating system comprises a heating main pipe, a heating branch pipe, and a hot water tank. The heating main pipe and the heating branch pipe are connected, and the hot water tank is connected to the heating main pipe through a circulating water pump.

[0012] The heat tracing branch pipe exchanges heat with one or more of the urea tank, the caustic soda tank, the cooling tower, the bag filter, the ash conveying chain, the bucket elevator, the fly ash bin, and the bin top spiral.

[0013] Preferably, the heating branch pipe is connected in parallel to the heating main pipe.

[0014] Preferably, a steam main pipe for receiving steam is provided on the heating main pipe.

[0015] Preferably, the steam main pipe is provided with an on / off valve for opening and closing the steam main pipe.

[0016] Preferably, the urea in the urea tank enters the urea spray gun under the drive of a urea pump.

[0017] Preferably, the flue gas passes through the cooling tower, bag filter, wet scrubber, and activated carbon adsorption tower in sequence.

[0018] Preferably, the bucket elevator is vertically arranged, one end of the ash conveying chain in the ash conveying direction is connected to the ash inlet end at the bottom of the bucket elevator, the silo top spiral is horizontally arranged, the ash inlet end of the silo top spiral is connected to the ash outlet end at the top of the bucket elevator, the fly ash bin is vertically arranged, the ash outlet end of the silo top spiral is located in the fly ash bin, the ash outlet end of the fly ash bin is located at the bottom of the side wall of the fly ash bin, the fly ash spiral is horizontally arranged, the ash inlet end of the fly ash spiral is connected to the ash outlet end of the fly ash bin, and the ash outlet end of the fly ash spiral is connected to the fly ash curing chamber.

[0019] Preferably, the fly ash spiral is located at the bottom of the side wall of the fly ash bin.

[0020] Preferably, the silo top spiral is located on the top of the fly ash silo.

[0021] Preferably, the cooling tower comprises a spray chamber and an ash collecting hopper, the ash collecting hopper is located below the spray chamber, an atomizing water spray gun is arranged at the top of the spray chamber, and a scraper valve is arranged at the bottom of the ash collecting hopper.

[0022] Preferably, one end of the spray chamber side wall close to the ash hopper is the smoke inlet end of the cooling tower, and one end of the spray chamber side wall away from the ash hopper is the smoke outlet end of the cooling tower.

[0023] Preferably, the smoke exhaust end of the cooling tower is connected to a downstream bag filter.

[0024] Preferably, the fly ash in the ash collecting hopper is discharged through a scraper valve and enters an ash conveying chain.

[0025] Preferably, the bag dust collector comprises a bag bin and an ash collecting hopper, the ash collecting hopper is located below the bag bin, dust collection bags are arranged in the bag bin, a compressed air pulse device is arranged on the top of the bag bin, and a gate valve is arranged at the bottom of the ash collecting hopper.

[0026] Preferably, the end of the bag bin side wall close to the ash hopper is the smoke inlet end of the bag collector, and the end of the bag bin side wall away from the ash hopper is the smoke outlet end of the bag collector. The smoke inlet end and outlet end of the bag collector are respectively located on both sides of the dust bag.

[0027] Preferably, the fume exhaust end of the bag filter is connected to a downstream wet scrubbing tower.

[0028] Preferably, the bag filter is provided with one or more ash hoppers.

[0029] Preferably, the fly ash in the ash collecting hopper is discharged through a gate valve and enters an ash conveying chain.

[0030] Preferably, the ash conveying chain includes a first ash conveying chain, a second ash conveying chain and a common ash conveying chain, one end of the first ash conveying chain and one end of the second ash conveying chain in the ash conveying direction are respectively connected to the common ash conveying chain, and one end of the common ash conveying chain in the ash conveying direction is connected to a bucket elevator.

[0031] Preferably, the fly ash discharged from the ash collecting hopper enters the first ash conveying chain.

[0032] Preferably, the fly ash discharged from the ash collecting hopper enters the second ash conveying chain.

[0033] Preferably, the heating branch pipe for exchanging heat with the urea tank is a first heating branch pipe, and the first heating branch pipe is fixedly connected to the urea tank.

[0034] Preferably, the first heating branch pipe is spirally wound on the outer wall of the urea tank along the height direction of the urea tank.

[0035] Preferably, the entry end of the first heating branch pipe is arranged at a height higher than the discharge end.

[0036] Preferably, the number of the first heating branch pipes is one or more.

[0037] Preferably, a plurality of the first heating branch pipes are respectively connected to the heating mother pipe.

[0038] Preferably, the heating branch pipe for exchanging heat with the caustic soda tank is a second heating branch pipe, and the second heating branch pipe is fixedly connected to the caustic soda tank.

[0039] Preferably, the second heating branch pipe is spirally wound on the outer wall of the caustic soda tank along the height direction of the caustic soda tank.

[0040] Preferably, the entry end of the second heating branch pipe is arranged at a height higher than the discharge end.

[0041] Preferably, the number of the second heating branch pipes is one or more.

[0042] Preferably, a plurality of the second heating branch pipes are respectively connected to the heating main pipe.

[0043] Preferably, the heating branch pipe for exchanging heat with the outer wall of the ash collecting hopper is a third heating branch pipe, and the third heating branch pipe is fixedly connected to the outer wall of the ash collecting hopper.

[0044] Preferably, the third heating branch pipe is spirally wound on the outer wall of the ash collecting hopper along the height direction of the ash collecting hopper.

[0045] Preferably, the entrance end of the third heating branch pipe is arranged at a height higher than the discharge end.

[0046] Preferably, the number of the third heating branch pipes is one or more.

[0047] Preferably, the plurality of third heating branch pipes are respectively connected to the heating mother pipe.

[0048] Preferably, the heating branch pipe for exchanging heat with the outer wall of the ash collecting hopper is a fourth heating branch pipe, and the fourth heating branch pipe is fixedly connected to the outer wall of the ash collecting hopper.

[0049] Preferably, the fourth heating branch pipe is spirally wound on the outer wall of the ash collecting hopper along the height direction of the ash collecting hopper.

[0050] Preferably, the entrance end of the fourth heating branch pipe is arranged at a height higher than the discharge end.

[0051] Preferably, the number of the fourth heating branch pipes is one or more.

[0052] Preferably, the plurality of fourth heating branch pipes are respectively connected to the heating mother pipe.

[0053] Preferably, the heating branch pipe for exchanging heat with the outer wall of the bucket elevator is a fifth heating branch pipe, and the fifth heating branch pipe is fixedly connected to the outer wall of the bucket elevator.

[0054] Preferably, the fifth heating branch pipe extends along the height direction of the bucket elevator and is fixed on the outer wall of the bucket elevator.

[0055] Preferably, the entrance end of the fifth heating branch pipe is arranged at a height higher than the discharge end.

[0056] Preferably, the number of the fifth heating branch pipes is one or more.

[0057] Preferably, the plurality of fifth heating branch pipes are respectively connected to the heating mother pipe.

[0058] Preferably, the bucket elevator is in the shape of a quadrangular prism as a whole, and the four side walls of the bucket elevator are each provided with a fifth heating branch pipe.

[0059] Preferably, the heating branch pipe for exchanging heat with the spiral outer wall of the silo top is the sixth heating branch pipe, and the sixth heating branch pipe is fixedly connected to the spiral outer wall of the silo top.

[0060] Preferably, the sixth heating branch pipe is spirally wound on the outer wall of the silo top spiral along the length direction of the silo top spiral.

[0061] Preferably, the number of the sixth heating branch pipes is one or more.

[0062] Preferably, the plurality of sixth heating branch pipes are respectively connected to the steam main pipe.

[0063] Preferably, the heating branch pipe for exchanging heat with the outer wall of the fly ash bin is the seventh heating branch pipe, and the seventh heating branch pipe is fixedly connected to the outer wall of the fly ash bin.

[0064] Preferably, the seventh heating branch pipe is spirally wound on the outer wall of the fly ash bin along the height direction of the fly ash bin.

[0065] Preferably, the height at which the entry end of the seventh heating branch pipe is arranged is higher than the height at which the discharge end is arranged.

[0066] Preferably, the number of the seventh heating branch pipe is one or more.

[0067] Preferably, the plurality of seventh heating branch pipes are respectively connected to the heating mother pipe.

[0068] Preferably, the heating branch pipe for exchanging heat with the outer wall of the first ash conveying chain is an eighth heating branch pipe, and the eighth heating branch pipe is fixedly connected to the outer wall of the first ash conveying chain.

[0069] Preferably, the eighth heating branch pipe extends along the length direction of the first ash conveying chain.

[0070] Preferably, the number of the eighth heating branch pipe is one or more.

[0071] Preferably, the plurality of eighth heating branch pipes are respectively connected to the heating mother pipe.

[0072] Preferably, the eighth heating branch pipe is respectively arranged on the outer walls on both sides horizontally along the length direction of the first ash conveying chain.

[0073] Preferably, the eighth heating branch pipe located on the horizontal outer walls on both sides of the first ash conveying chain along the length direction is close to the bottom of the first ash conveying chain.

[0074] Preferably, the heating branch pipe for exchanging heat with the outer wall of the second ash conveying chain is a ninth heating branch pipe, and the ninth heating branch pipe is fixedly connected to the outer wall of the second ash conveying chain.

[0075] Preferably, the ninth heating branch pipe extends along the length direction of the second ash conveying chain.

[0076] Preferably, the number of the ninth heating branch pipe is one or more.

[0077] Preferably, the plurality of ninth heating branch pipes are respectively connected to the heating mother pipe.

[0078] Preferably, the ninth heating branch pipe is respectively arranged on the horizontal side outer walls and the bottom outer wall of the second ash conveying chain along the length direction.

[0079] Preferably, the ninth heating branch pipe located on the horizontal outer walls on both sides of the second ash conveying chain along the length direction is close to the bottom of the second ash conveying chain.

[0080] Preferably, the heating branch pipe for exchanging heat with the outer wall of the common ash conveying chain is the tenth heating branch pipe, and the tenth heating branch pipe is fixedly connected to the outer wall of the common ash conveying chain.

[0081] Preferably, the tenth heating branch pipe extends along the length direction of the common ash conveying chain.

[0082] Preferably, the number of the tenth heating branch pipe is one or more.

[0083] Preferably, the plurality of tenth heating branch pipes are respectively connected to the heating mother pipe.

[0084] Preferably, the tenth heating branch pipe is respectively arranged on the outer walls on both sides horizontally along the length direction of the common ash conveying chain.

[0085] Preferably, the tenth heating branch pipe located on the horizontal outer walls on both sides of the common ash conveying chain along the length direction is close to the bottom of the common ash conveying chain.

[0086] Preferably, the common ash conveying chain includes a one-stage ash conveying chain, a two-stage ash conveying chain and a three-stage ash conveying chain.

[0087] Preferably, the heating branch pipe is a stainless steel pipe or a copper pipe.

[0088] Preferably, the joints at both ends of the heating branch pipe are ferrule-threaded joints.

[0089] Preferably, the joints at both ends of the heating branch pipe are copper heads or stainless steel heads.

[0090] Preferably, the heating branch pipe is fixed to the heat exchange equipment by intermittent welding.

[0091] Preferably, heat-conducting paste is provided between the heat tracing branch pipe and the heat exchange equipment.

[0092] In the above content of this application, each preferred or more preferred solution can be combined with each other.

[0093] In summary, the present invention has the following beneficial effects:

[0094] The steam extraction and boiler sewage both come from the waste incineration power generation process. Compared with electric heating, the present invention recovers the waste heat of the steam extraction and boiler sewage and provides heat for the above-mentioned equipment that needs heating, saving electric energy and meeting the purpose of "energy conservation and emission reduction" and the requirement of "sustainable development". BRIEF DESCRIPTION OF THE DRAWINGS

[0095] Figure 1 It is a schematic diagram of the workflow of the present invention;

[0096] Figure 2 It is a schematic diagram of the flue gas treatment process in the present invention;

[0097] Figure 3 It is a schematic diagram of the distribution of the first heating branch pipe on the urea tank in the present invention;

[0098] Figure 4 It is a schematic diagram of the distribution of the third heat tracing branch pipe on the cooling tower in the present invention;

[0099] Figure 5 It is a schematic diagram of the distribution of the fourth heating branch pipe on the bag filter in the present invention;

[0100] Figure 6 It is a schematic diagram of the fly ash conveying process in the present invention;

[0101] Figure 7 It is a heat tracing schematic diagram of the heat tracing system in the present invention;

[0102] Figure 8 It is a schematic diagram of the distribution of the second heating branch pipe on the caustic soda tank in the present invention;

[0103] Fig. 9 Schematic diagram of the distribution of the fifth heating sub-pipe on the bucket elevator in the present invention;

[0104] Fig.10 It is a schematic diagram of the distribution of the sixth heating branch pipe on the silo top spiral in the present invention;

[0105] Fig.11 It is a schematic diagram of the distribution of the seventh heating branch pipe on the fly ash bin in the present invention;

[0106] Fig.12 Schematic diagram of the distribution of the eighth heating branch pipe on the first ash conveying chain in the present invention;

[0107] Fig.13 It is a schematic diagram of the distribution of the ninth heating branch pipe on the second ash conveying chain in the present invention;

[0108] Fig.14 It is a schematic diagram of the distribution of the tenth heating branch pipe on the common ash conveying chain in the present invention;

[0109] Fig.15 It is a schematic diagram of the installation cross section of the heat tracing pipe in the present invention;

[0110] Fig.16 It is a position distribution diagram of the ash conveying chain and the fly ash solidification system in the present invention.

[0111] Figure numerals: 1, flue gas purification system; 2, ash conveying chain; 21, first ash conveying chain; 22, second ash conveying chain; 23, common ash conveying chain; 3, fly ash solidification system; 31, bucket elevator; 32, silo top spiral; 33, fly ash silo; 34, fly ash spiral; 35, fly ash solidification chamber; 4, heating system; 401, heating main pipe; 402, first heating branch pipe; 403, second heating branch pipe; 404, third heating branch pipe; 405, fourth heating branch pipe; 406, fifth heating branch pipe pipe; 407, the sixth heating branch; 408, the seventh heating branch; 409, the eighth heating branch; 410, the ninth heating branch; 411, the tenth heating branch; 412, the hot water tank; 413, the steam main pipe; 5, the cooling tower; 51, the ash hopper; 52, the spray chamber; 6, the bag filter; 61, the bag bin; 62, the ash hopper; 7, the wet scrubber; 8, the activated carbon adsorption tower; 9, the SNCR system; 10, the caustic soda tank; 11, the urea tank; 12, the thermal conductive cement. DETAILED DESCRIPTION

[0112] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0113] A waste incineration flue gas treatment system with energy-saving heating, such as Figure 1 and Figure 2 As shown, it includes a flue gas purification system 1, an ash conveying chain 2, a fly ash solidification system 3, and a heating system 4, wherein the flue gas purification system 1 is used to purify the flue gas generated by the incinerator during the power generation process, the ash conveying chain 2 is used to transport the fly ash formed when the flue gas purification system 1 purifies the flue gas, the fly ash solidification system 3 is used to store and solidify the fly ash, and the heating system 4 is used to maintain the working temperature of the relevant equipment in the flue gas purification system 1, the ash conveying chain 2, and the fly ash solidification system 3.

[0114] The flue gas purification system 1 includes a cooling tower 5, a bag filter 6, a wet scrubber 7, and an activated carbon adsorption tower 8 from upstream to downstream. The flue gas purification system 1 also includes an SNCR (selective non-catalytic reduction) system 9 and a caustic soda tank 10. The flue gas passes through the cooling tower 5, the bag filter 6, the wet scrubber 7, and the activated carbon adsorption tower 8 in sequence. The SNCR system 9 is used to treat nitrogen oxides in the flue gas, the cooling tower 5 is used to reduce the flue gas temperature and dust concentration, the bag filter 6 is used to treat acidic gases and dust particles in the flue gas, and the wet scrubber 7 is used to further treat acidic gases in the flue gas. After being treated by the flue gas purification system 1, the flue gas can meet the emission standards for discharge.

[0115] like Figure 2 and Figure 3 As shown, the SNCR system 9 includes a urea tank 11, a urea pump and a urea spray gun, wherein the urea tank 11 and the urea spray gun are connected via the urea pump, and the urea spray gun is connected to the incinerator. Urea is extracted from the urea tank 11 via the urea pump and sprayed into the incinerator via the urea spray gun.

[0116] like Figure 2 and Figure 4 As shown, the high-temperature flue gas in the incinerator treated by the SNCR method enters the cooling tower 5, and the cooling tower 5 includes an ash hopper 51 and a spray chamber 52, wherein the ash hopper 51 is located below the spray chamber 52, and the end of the side wall of the spray chamber 52 close to the ash hopper 51 is the flue gas inlet end of the cooling tower 5, and the end of the side wall of the spray chamber 52 away from the ash hopper 51 is the flue gas discharge end of the cooling tower 5. The flue gas discharge end of the cooling tower 5 is connected to the downstream bag filter 6, and an atomizing water spray gun is provided on the top of the spray chamber 52, and a scraper valve is provided at the bottom of the ash hopper 51. The atomizing water spray gun sprays atomized cooling water on the high-temperature flue gas to cool it down, and the fly ash falls to the bottom of the ash hopper 51 and is discharged from the cooling tower 5 through the scraper valve.

[0117] like Figure 2 and Figure 5As shown, the flue gas cooled by condensed water in the cooling tower 5 enters the bag filter 6 for dry acid removal. The bag filter 6 includes an ash hopper 62 and a bag bin 61, wherein the ash hopper 62 is located below the bag bin 61, and dust bags are arranged between the bag bin 61 and the ash hopper 62. The end of the side wall of the bag bin 61 close to the ash hopper 62 is the flue gas inlet end of the bag filter 6, and the end of the side wall of the bag bin 61 away from the ash hopper 62 is the flue gas outlet end of the bag filter 6. The flue gas inlet and outlet ends of the bag-type dust collector 6 are respectively located on both sides of the dust collecting bags. The flue gas outlet end of the bag-type dust collector 6 is connected to the downstream wet scrubbing tower 7. A compressed air pulse device is provided on the top of the bag bin 61, and a gate valve is provided at the bottom of the ash collecting hopper 62. The acidic gas and dust particles in the flue gas form fly ash on the dust collecting bags. The compressed air pulse device shakes the dust collecting bags to deposit the fly ash at the bottom of the ash collecting hopper 62, and then is discharged to the outside of the bag-type dust collector 6 through the gate valve.

[0118] like Figure 2 As shown, the flue gas after dry acid removal enters the wet scrubber 7 for wet acid removal. The wet scrubber 7 is provided with a circulating caustic soda pump. The bottom of the caustic soda tank 10 is connected to the wet scrubber 7. The top of the caustic soda tank 10 is connected to the top of the wet scrubber 7 through the circulating caustic soda pump. The caustic soda solution in the caustic soda tank 10 enters from the top of the wet scrubber 7 through the drive of the circulating caustic soda pump, and flows back to the caustic soda tank 10 after falling. The acidic gas in the flue gas reacts with the caustic soda solution and is further removed. The flue gas after acid removal enters the activated carbon adsorption tower 8 for dust removal and dehumidification before being discharged.

[0119] like Figure 6 As shown, the ash conveying chain 2 is divided into a first ash conveying chain 21, a second ash conveying chain 22 and a common ash conveying chain 23 according to different positions. The fly ash discharged from the cooling tower 5 enters the first ash conveying chain 21, and the fly ash discharged from the bag filter 6 enters the second ash conveying chain 22. The fly ash in the first ash conveying chain 21 is transported to the common ash conveying chain 23, the fly ash in the second ash conveying chain 22 is transported to the common ash conveying chain 23, and the fly ash in the common ash conveying chain 23 is transported to the bucket elevator 31.

[0120] The fly ash solidification system 3 includes a bucket elevator 31, a silo top spiral 32, a fly ash silo 33, a fly ash spiral 34 and a fly ash solidification chamber 35 from upstream to downstream. The bucket elevator 31 is located at one end of the common ash conveying chain 23. The common ash conveying chain 23 conveys fly ash to the bucket elevator 31. The bucket elevator 31 lifts the fly ash to the silo top spiral 32. The silo top spiral 32 conveys the fly ash to the fly ash silo 33. When the fly ash in the fly ash silo 33 accumulates to a certain level, the fly ash spiral 34 conveys the fly ash into the fly ash solidification chamber 35 for subsequent treatment.

[0121] like Figure 7As shown, the heating system 4 includes a heating main pipe 401, a heating branch pipe, and a hot water tank 412. The heating main pipe 401 and the heating branch pipe are connected. The hot water tank 412 contains boiler sewage. The hot water tank 412 is connected to the heating main pipe 401 through a circulating water pump. The heating main pipe 401 is provided with a steam main pipe 413. The other end of the steam main pipe 413 is connected to the steam turbine for receiving steam. The steam main pipe 413 is provided with a switch valve for switching the steam main pipe 413. In summer, the steam main pipe 413 is closed by the switch valve. The heating system 4 uses the boiler sewage in the hot water tank 412 as heat exchange The medium circulates in the heating system 4 driven by the circulating water pump. In winter, the steam main pipe 413 is opened by the switch valve. The heating system 4 uses the extracted steam introduced from the steam turbine by the steam main pipe 413 as the heat exchange medium. The extracted steam is high-pressure steam and can circulate in the heating system 4 without being driven. The condensed water enters the hot water tank 412. The heating pipes are respectively for the urea tank 11, the caustic soda tank 10, the ash hopper 51, the ash collecting hopper 62, the bucket elevator 31, the silo top spiral 32, the fly ash silo 33, the first ash conveying chain 212, the second ash conveying chain 222, and the common ash conveying chain 232 to provide heating.

[0122] like Figure 3 As shown, the heating branch pipe for exchanging heat with the urea tank 11 is the first heating branch pipe 402, the first heating branch pipe 402 is fixedly connected to the urea tank 11, the first heating branch pipe 402 is spirally wound on the outer wall of the urea tank 11 along the height direction of the urea tank 11, the entrance end of the first heating branch pipe 402 is set at a height higher than the discharge end, for the convenience of installation, the number of the first heating branch pipes 402 is multiple, preferably, there are two first heating branch pipes 402, and the two first heating branch pipes 402 are respectively connected to the heating mother pipe 401.

[0123] like Figure 8 As shown, the heating branch pipe for exchanging heat with the caustic soda tank 10 is the second heating branch pipe 403, the second heating branch pipe 403 is fixedly connected to the caustic soda tank 10, the second heating branch pipe 403 is spirally wound on the outer wall of the caustic soda tank 10 along the height direction of the caustic soda tank 10, the entrance end of the second heating branch pipe 403 is set at a height higher than the discharge end, the number of the second heating branch pipes 403 is multiple, preferably, there are three second heating branch pipes 403, and the three second heating branch pipes 403 are respectively connected to the heating mother pipe 401.

[0124] like Figure 4As shown, the heating branch pipe for exchanging heat with the outer wall of the ash hopper 51 is the third heating branch pipe 404, the third heating branch pipe 404 is fixedly connected to the outer wall of the ash hopper 51, the third heating branch pipe 404 is spirally wound on the outer wall of the ash hopper 51 along the height direction of the ash hopper 51, the entrance end of the third heating branch pipe 404 is set at a height higher than the discharge end, the number of the third heating branch pipes 404 is multiple, preferably, there are four third heating branch pipes 404, and the four third heating branch pipes 404 are respectively connected to the heating mother pipe 401.

[0125] like Figure 5 As shown, the heating branch pipe for exchanging heat with the outer wall of the ash hopper 62 is the fourth heating branch pipe 405, the fourth heating branch pipe 405 is fixedly connected to the outer wall of the ash hopper 62, the fourth heating branch pipe 405 is spirally wound on the outer wall of the ash hopper 62 along the height direction of the ash hopper 62, the entrance end of the fourth heating branch pipe 405 is set at a height higher than the discharge end, the number of the fourth heating branch pipes 405 is multiple, preferably, there are three third heating branch pipes 404, and the three fourth heating branch pipes 405 are respectively connected to the heating mother pipe 401.

[0126] like Fig. 9 As shown, the heating branch pipe for exchanging heat with the outer wall of the bucket elevator 31 is the fifth heating branch pipe 406, the fifth heating branch pipe 406 is fixedly connected to the outer wall of the bucket elevator 31, the fifth heating branch pipe 406 extends along the height direction of the bucket elevator 31 and is fixed on the outer wall of the bucket elevator 31, the entrance end of the fifth heating branch pipe 406 is set at a height higher than the discharge end, there are multiple fifth heating branch pipes 406, and the multiple fifth heating branch pipes 406 are respectively connected to the heating mother pipe 401. Preferably, the bucket elevator 31 is in the shape of a quadrangular prism as a whole, and three fifth heating branch pipes 406 are set on the four side walls of the bucket elevator 31.

[0127] like Fig.10 As shown, the heating branch pipe for exchanging heat with the outer wall of the silo top spiral 32 is the sixth heating branch pipe 407. The sixth heating branch pipe 407 is fixedly connected to the outer wall of the silo top spiral 32. The sixth heating branch pipe 407 is spirally wound on the outer wall of the silo top spiral 32 along the length direction of the silo top spiral 32. There are multiple sixth heating branch pipes 407. Preferably, there are two sixth heating branch pipes 407, and the two sixth heating branch pipes 407 are respectively connected to the steam main pipe 413.

[0128] like Fig.11 As shown, the heating branch pipe for exchanging heat with the outer wall of the fly ash bin 33 is the seventh heating branch pipe 408, the seventh heating branch pipe 408 is fixedly connected to the outer wall of the fly ash bin 33, the seventh heating branch pipe 408 is spirally wound on the outer wall of the fly ash bin 33 along the height direction of the fly ash bin 33, the entrance end of the seventh heating branch pipe 408 is set at a height higher than the discharge end, the number of the seventh heating branch pipes 408 is multiple, preferably, the number of the seventh heating branch pipes 408 is seven, and the seven seventh heating branch pipes 408 are respectively connected to the heating mother pipe 401.

[0129] like Fig.12 As shown, the heating branch pipe that exchanges heat with the outer wall of the first ash conveying chain 21 is the eighth heating branch pipe 409. The eighth heating branch pipe 409 is fixedly connected to the outer wall of the first ash conveying chain 21. The eighth heating branch pipe 409 extends along the length direction of the first ash conveying chain 21. There are multiple eighth heating branch pipes 409, and the multiple eighth heating branch pipes 409 are respectively connected to the heating mother pipe 401. The multiple eighth heating branch pipes 409 are respectively arranged on the outer walls on both sides horizontally along the length direction of the first ash conveying chain 21 and close to the bottom of the first ash conveying chain 21. Preferably, there are three eighth heating branch pipes 409 on each side.

[0130] like Fig.13 As shown, the heating branch pipe that exchanges heat with the outer wall of the second ash conveying chain 22 is the ninth heating branch pipe 410, and the ninth heating branch pipe 410 is fixedly connected to the outer wall of the second ash conveying chain 22. The ninth heating branch pipe 410 extends along the length direction of the second ash conveying chain 22. There are multiple ninth heating branch pipes 410, and the multiple ninth heating branch pipes 410 are respectively connected to the heating mother pipe 401. The multiple ninth heating branch pipes 410 are respectively arranged on the outer walls on both sides horizontally along the length direction of the second ash conveying chain 22 and close to the bottom of the second ash conveying chain 22. Preferably, the ninth heating branch pipe 410 is also arranged at the bottom of the second ash conveying chain 22, wherein two ninth heating branch pipes 410 are arranged on each of the two horizontal outer walls, and three ninth heating branch pipes 410 are arranged at the bottom.

[0131] like Fig.14 As shown, the heating branch pipe that exchanges heat with the outer wall of the common ash conveying chain 23 is the tenth heating branch pipe 411, the tenth heating branch pipe 411 is fixedly connected to the outer wall of the common ash conveying chain 23, the tenth heating branch pipe 411 extends along the length direction of the common ash conveying chain 23, the number of the tenth heating branch pipe 411 is multiple, the multiple tenth heating branch pipes 411 are respectively connected to the heating mother pipe 401, the multiple tenth heating branch pipes 411 are respectively arranged on the outer walls of both sides horizontally along the length direction of the common ash conveying chain 23 and close to the bottom of the common ash conveying chain 23, preferably, there are three tenth heating branch pipes 411 on each side.

[0132] like Fig.15 As shown, the heating branch pipe is made of stainless steel pipe or copper pipe, and the heating branch pipe and the heat exchange equipment are fixed by intermittent welding. In order to increase the heat conduction capacity between the heating branch pipe and the heat exchange equipment, as shown in the figure, the heating branch pipe and the equipment are filled with thermal conductive paste 12, and both ends of the heating branch pipe are provided with ferrule-threaded joints, and the ferrule-threaded joints are made of copper or stainless steel forgings.

[0133] like Figure 1 and Fig.16As shown, in an embodiment of power generation using a four-furnace independent operation system, the four incinerators correspond to four groups of cooling towers 5 and bag-type dust collectors 6, respectively. The four groups of cooling towers 5 and bag-type dust collectors 6 share a group of common ash conveying chains 232 and a fly ash solidification system 3. The cooling towers 5 and bag-type dust collectors 6 in the four flue gas purification systems 1 are distributed in sequence along the length direction of the common ash conveying chain 232. In order to increase the ash discharge efficiency of the bag-type dust collectors 6, each bag-type dust collector 6 is provided with two rows of six ash collecting hoppers 62. The two rows of ash collecting hoppers 62 under each bag-type dust collector 6 correspond to two second ash conveying chains 22, respectively. The two second ash conveying chains 22 respectively transport the fly ash discharged from the two rows of ash collecting hoppers 62 to the common ash conveying chain 23. In this embodiment, there are a total of four first ash conveying chains 21, eight second ash conveying chains 22, and one common ash conveying chain 23 to transport the fly ash generated in the flue gas purification process of the cooling towers 5 and the bag-type dust collectors 6.

[0134] In summary, the present invention reuses the extracted steam and boiler wastewater generated in the waste-to-energy process, utilizes the waste heat of the extracted steam and boiler wastewater to maintain the working temperature of the equipment, reduces the system's energy loss in maintaining the working temperature of the equipment, and meets the purpose of "energy conservation and emission reduction" and the requirements of "sustainable development".

[0135] This specific implementation manner is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A waste incineration flue gas treatment system with energy-saving heating, characterized in that: Including flue gas purification system, ash conveying chain, fly ash solidification system, and heating system; The flue gas purification system includes a cooling tower, a bag filter, a wet scrubber, and an activated carbon adsorption tower from upstream to downstream, and the flue gas purification system also includes an SNCR system and a caustic soda tank; The SNCR system comprises a urea tank and a urea spray gun, wherein the urea spray gun is connected to the urea tank; The caustic soda tank is connected to the wet scrubber via a circulating caustic soda pump; The fly ash solidification system includes a bucket elevator, a silo top screw, a fly ash silo, a fly ash screw and a fly ash solidification chamber in order from upstream to downstream; The ash conveying chain conveys the fly ash discharged from the cooling tower and the bag filter to the bucket elevator; The heating system comprises a heating main pipe, a heating branch pipe, and a hot water tank. The heating main pipe and the heating branch pipe are connected. The hot water tank is connected to the heating main pipe through a circulating water pump. The hot water tank contains boiler sewage. The heating branch pipe exchanges heat with one or more of the urea tank, the caustic soda tank, the cooling tower, the bag filter, the ash conveying chain, the bucket elevator, the fly ash bin, and the silo top spiral; The heating main pipe is provided with a steam main pipe for receiving steam, the other end of the steam main pipe is connected to the steam turbine for receiving steam, and the steam main pipe is provided with a switch valve for switching the steam main pipe.

2. A waste incineration flue gas treatment system with energy-saving heating according to claim 1, characterized in that: The heating branch pipe for heat exchange with the urea tank is a first heating branch pipe, which is fixedly connected to the urea tank; the first heating branch pipe is spirally wound on the outer wall of the urea tank along the height direction of the urea tank; the height of the inlet end of the first heating branch pipe is higher than the height of the outlet end; the number of the first heating branch pipes is one or more.

3. A waste incineration flue gas treatment system with energy-saving heating according to claim 1, characterized in that: The heating branch pipe for exchanging heat with the caustic soda tank is a second heating branch pipe, and the second heating branch pipe is fixedly connected to the caustic soda tank; the second heating branch pipe is spirally wound on the outer wall of the caustic soda tank along the height direction of the caustic soda tank, and the height set at the inlet end of the second heating branch pipe is higher than the height set at the outlet end; the number of the second heating branch pipes is one or more.

4. A waste incineration flue gas treatment system with energy-saving heating according to claim 1, characterized in that: The cooling tower includes a spray chamber and an ash hopper. The heating branch pipe for exchanging heat with the outer wall of the ash hopper is a third heating branch pipe. The third heating branch pipe is fixedly connected to the outer wall of the ash hopper. The third heating branch pipe is spirally wound on the outer wall of the ash hopper along the height direction of the ash hopper. The height of the inlet end of the third heating branch pipe is higher than the height of the discharge end. The number of the third heating branch pipes is one or more.

5. The waste incineration flue gas treatment system with energy-saving heating according to claim 1 is characterized in that: The bag-type dust collector comprises a bag bin and an ash hopper. The heating branch pipe for exchanging heat with the outer wall of the ash hopper is a fourth heating branch pipe, and the fourth heating branch pipe is fixedly connected to the outer wall of the ash hopper; the fourth heating branch pipe is spirally wound on the outer wall of the ash hopper along the height direction of the ash hopper; the height at which the inlet end of the fourth heating branch pipe is set is higher than the height at which the outlet end is set; the number of the fourth heating branch pipes is one or more.

6. A waste incineration flue gas treatment system with energy-saving heating according to claim 1, characterized in that: The heating branch pipe for exchanging heat with the outer wall of the bucket elevator is the fifth heating branch pipe, and the fifth heating branch pipe is fixedly connected to the outer wall of the bucket elevator; the fifth heating branch pipe extends along the height direction of the bucket elevator and is fixed on the outer wall of the bucket elevator; the height of the entry end of the fifth heating branch pipe is higher than the height of the discharge end; the number of the fifth heating branch pipes is one or more; the plurality of the fifth heating branch pipes are respectively connected to the heating mother pipe; the bucket elevator is in the shape of a quadrangular prism as a whole, and the four side walls of the bucket elevator are all provided with the fifth heating branch pipes.

7. The waste incineration flue gas treatment system with energy-saving heating according to claim 1 is characterized in that: The sixth heating branch pipe is used for heat exchange with the spiral outer wall of the silo top. The sixth heating branch pipe is fixedly connected to the spiral outer wall of the silo top. The sixth heating branch pipe is spirally wound on the spiral outer wall of the silo top along the length direction of the silo top spiral. The number of the sixth heating branch pipes is one or more.

8. The waste incineration flue gas treatment system with energy-saving heating according to claim 1 is characterized in that: The heating branch pipe for exchanging heat with the outer wall of the fly ash bin is the seventh heating branch pipe, and the seventh heating branch pipe is fixedly connected to the outer wall of the fly ash bin; the seventh heating branch pipe is spirally wound on the outer wall of the fly ash bin along the height direction of the fly ash bin; the height set at the inlet end of the seventh heating branch pipe is higher than the height set at the discharge end; the number of the seventh heating branch pipes is one or more.

9. The waste incineration flue gas treatment system with energy-saving heating according to claim 1 is characterized in that: The ash conveying chain includes a first ash conveying chain, a second ash conveying chain and a common ash conveying chain, wherein the first ash conveying chain is connected to a cooling tower, the second ash conveying chain is connected to a bag filter, one end of the first ash conveying chain in the ash conveying direction and one end of the second ash conveying chain in the ash conveying direction are respectively connected to the common ash conveying chain, and one end of the common ash conveying chain in the ash conveying direction is connected to a bucket elevator; The heating branch pipe for heat exchange with the outer wall of the first ash conveying chain is the eighth heating branch pipe, and the eighth heating branch pipe is fixedly connected to the outer wall of the first ash conveying chain; the eighth heating branch pipe extends along the length direction of the first ash conveying chain; the number of the eighth heating branch pipes is one or more; the eighth heating branch pipes are respectively arranged on the outer walls on both sides horizontally along the length direction of the first ash conveying chain; the eighth heating branch pipes located on the outer walls on both sides horizontally along the length direction of the first ash conveying chain are close to the bottom of the first ash conveying chain; The heating branch pipe for exchanging heat with the outer wall of the second ash conveying chain is the ninth heating branch pipe, and the ninth heating branch pipe is fixedly connected to the outer wall of the second ash conveying chain; the ninth heating branch pipe extends along the length direction of the second ash conveying chain; the number of the ninth heating branch pipes is one or more; the ninth heating branch pipe is respectively arranged on the outer walls on both sides horizontally along the length direction and the outer wall on the bottom of the second ash conveying chain; the ninth heating branch pipe located on the outer walls on both sides horizontally along the length direction of the second ash conveying chain is close to the bottom of the second ash conveying chain; The heating branch pipe that exchanges heat with the outer wall of the common ash conveying chain is the tenth heating branch pipe, and the tenth heating branch pipe is fixedly connected to the outer wall of the common ash conveying chain; the tenth heating branch pipe extends along the length direction of the common ash conveying chain; the number of the tenth heating branch pipes is one or more; the tenth heating branch pipe is respectively arranged on the outer walls on both sides horizontally along the length direction of the common ash conveying chain; the tenth heating branch pipe located on the outer walls on both sides horizontally along the length direction of the common ash conveying chain is close to the bottom of the common ash conveying chain.

10. A waste incineration flue gas treatment system with energy-saving heating according to claim 9, characterized in that: The heating branch pipe is fixed to one or more of the urea tank, the caustic soda tank, the cooling tower, the bag filter, the ash conveying chain, the bucket elevator, the fly ash bin, and the bin top spiral by intermittent welding.

11. A waste incineration flue gas treatment system with energy-saving heating according to claim 10, characterized in that: Heat-conducting cement is arranged between the heating branch pipe and one or more of the urea tank, the caustic soda tank, the cooling tower, the bag filter, the ash conveying chain, the bucket elevator, the fly ash bin, and the bin top spiral.

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