CN213160178U

CN213160178U - Waste incineration flue gas treatment system with energy-saving heat tracing function

Info

Publication number: CN213160178U
Application number: CN202021275281.9U
Authority: CN
Inventors: 陈卫华; 沈龙; 朱寅; 陆佳欢; 钱佳磊
Original assignee: Shanghai Liming Resources Reuse Co ltd
Current assignee: Shanghai Liming Resources Reuse Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-05-11
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a waste incineration flue gas treatment system with energy-saving heat tracing, which comprises a flue gas purification system, an ash conveying chain, a fly ash solidification system and a heat tracing system, wherein the flue gas purification system comprises a cooling tower, a bag-type dust remover, a wet-type washing tower and an active carbon adsorption tower, the flue gas purification system also comprises a urea tank and a caustic soda tank, and the fly ash solidification system comprises a bucket elevator, a bin top screw, a fly ash bin, a fly ash screw and a fly ash solidification chamber; the heat tracing system comprises a heat tracing main pipe, a heat tracing branch pipe and a hot water tank, wherein the heat tracing main pipe and the heat tracing branch pipe are communicated, the hot water tank is connected with the heat tracing main pipe, and the heat tracing branch pipe is connected with a urea tank, a caustic soda tank, a cooling tower, a bag-type dust collector, an ash conveying chain, a bucket elevator, an ash flying bin and one or more of the top spirals of the bin are subjected to heat exchange, and the heat tracing main pipe is provided with a steam main pipe.

Description

Waste incineration flue gas treatment system with energy-saving heat tracing function

Technical Field

The utility model relates to a hazardous waste handles technical field, and more specifically says, relates to a take energy-conserving heat tracing's msw incineration flue gas processing system.

Background

The main equipment of the waste incineration power plant comprises 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, wherein waste incineration power generation refers to a power generation mode that waste is placed in the incinerator for incineration, the generated high-temperature flue gas enables 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 power. The waste is burnt to generate smoke and fly ash, and the smoke and the fly ash contain a large amount of heavy metals and dioxin, so the smoke and the fly ash are treated by a waste burning smoke treatment system and a fly ash curing system until the treated gas reaches the relevant standard and can be discharged.

The existing waste incineration flue gas treatment system generally adopts the process flows of dry method + wet method, fly ash chelation, solidification, landfill and the like to treat flue gas and fly ash generated after incineration. The process flow needs to use equipment such as a urea tank, a bag-type dust collector, a fly ash conveying chain, a fly ash bin, a caustic soda tank and the like, the equipment can keep normal operation at a certain working temperature when in use, and the traditional incineration plant adopts an electric heating mode to maintain the working temperature of the equipment, but the mode needs to consume extra electric energy and does not meet the purposes of energy conservation and emission reduction and the requirements of sustainable development of the incineration plant, so that the traditional waste incineration flue gas treatment system needs to be improved.

Disclosure of Invention

The utility model aims to prior art's is not enough, the utility model aims to provide a take energy-conserving heat tracing's msw incineration flue gas processing system, boiler blow off water, the partial steam recovery that this system produced in with the power generation process utilize the waste heat to maintain the operating temperature of equipment, reduce the system in the loss of this maintenance equipment electric energy in the aspect of the operating temperature, and then satisfied the purpose of "energy saving and emission reduction" and the requirement of "sustainable development".

In order to achieve the above purpose, the utility model provides a following technical scheme: a waste incineration flue gas treatment system with energy-saving heat tracing comprises a flue gas purification system, an ash conveying chain, a fly ash solidification system and a heat tracing system;

the flue gas purification system sequentially comprises a cooling tower, a bag-type dust collector, a wet washing tower and an activated carbon adsorption tower from upstream to downstream, and also comprises an SNCR (selective non-catalytic reduction) system and a caustic soda tank;

the SNCR system comprises a urea tank and a urea spray gun, wherein the urea spray gun is communicated with the urea tank;

the caustic soda tank is communicated with the wet washing tower through a circulating caustic soda pump;

the fly ash solidification system comprises a bucket elevator, a bin top screw, a fly ash bin, a fly ash screw and a fly ash solidification chamber from upstream to downstream in sequence;

the ash conveying chain conveys fly ash discharged by the cooling tower and the bag-type dust collector to the bucket elevator;

the heat tracing system comprises a heat tracing main pipe, a heat tracing branch pipe and a hot water tank, the heat tracing main pipe and the heat tracing branch pipe are communicated, and the hot water tank is connected with the heat tracing main pipe through a circulating water pump;

the heat tracing branch pipe exchanges heat with at least one of the urea tank, the caustic soda tank, the cooling tower, the bag-type dust remover, the ash conveying chain, the bucket elevator, the ash flying bin and the bin top screw.

Preferably, the heat trace branch pipes are connected in parallel to the heat trace main pipe.

Preferably, a steam main pipe for receiving steam is arranged on the heat tracing main pipe.

Preferably, the steam main pipe is provided with a switch valve for switching on and off the steam main pipe.

Preferably, the urea in the urea tank enters the urea spray gun under the driving of a urea pump.

Preferably, the flue gas passes through the cooling tower, the bag-type dust collector, the wet-type washing tower and the activated carbon adsorption tower in sequence.

Preferably, the vertical setting of bucket elevator, the one end of ash conveying chain ash conveying direction is carried the machine bottom with the bucket and is advanced the ash end and be connected, the spiral level in storehouse sets up, the spiral ash end that advances in storehouse is carried the machine top ash-out end with the bucket and is connected, fly the vertical setting in ash storehouse, the spiral ash-out end in storehouse is located fly ash storehouse, fly ash storehouse ash-out end is located fly ash storehouse lateral wall bottom, flying dust spiral level sets up, flying dust spiral advances the ash end and is connected with flying dust storehouse ash-out end, flying dust spiral ash-out end is connected with flying dust curing chamber.

Preferably, the fly ash auger is located at the bottom of the side wall of the fly ash silo.

Preferably, the top screw is positioned at the top of the fly ash bin.

Preferably, the cooling tower includes spray booth and receipts ash bucket, it is located the spray booth below to receive the ash bucket, the spray booth top is provided with the atomizing water spray gun, it is provided with the push-pull valve to receive the ash bucket bottom.

Preferably, one end of the side wall of the spraying chamber, which is close to the ash collecting hopper, is a flue gas inlet end of the cooling tower, and one end of the side wall of the spraying chamber, which is far away from the ash collecting hopper, is a flue gas outlet end of the cooling tower.

Preferably, the smoke discharge end of the cooling tower is connected with a downstream bag-type dust remover.

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

Preferably, the bag-type dust collector comprises a bag bin and a dust collecting hopper, the dust collecting hopper is located below the bag bin, a dust collecting bag is arranged in the bag bin, the top of the bag bin is provided with a compressed air pulse device, and the bottom of the dust collecting hopper is provided with a gate valve.

Preferably, one end of the side wall of the bag bin, which is close to the ash collecting hopper, is a flue gas inlet end of the bag-type dust collector, one end of the side wall of the bag bin, which is far away from the ash collecting hopper, is a flue gas outlet end of the bag-type dust collector, and the flue gas inlet end and the flue gas outlet end of the bag-type dust collector are respectively positioned on two sides of the dust collecting bag.

Preferably, the flue gas discharge end of the bag-type dust collector is connected with a downstream wet-type washing tower.

Preferably, the bag-type dust collector is provided with at least one dust collecting hopper.

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

Preferably, the ash conveying chain comprises a first ash conveying chain, a second ash conveying chain and a public ash conveying chain, 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 with the public ash conveying chain, and one end of the public ash conveying chain in the ash conveying direction is connected with the bucket elevator.

Preferably, the fly ash discharged from the ash collecting hopper enters a first ash conveying chain.

Preferably, the fly ash discharged from the ash collecting hopper enters a second ash conveying chain.

Preferably, the heat tracing branch pipe for heat exchange with the urea tank is a first heat tracing branch pipe, and the first heat tracing branch pipe is fixedly connected with the urea tank.

Preferably, the first heat tracing branch pipe is spirally wound on the outer wall of the urea tank along the height direction of the urea tank.

Preferably, the inlet end of the first heat tracing branch pipe is higher than the outlet end.

Preferably, the number of the first heat trace branch pipes is at least one.

Preferably, a plurality of the first heat trace branch pipes are respectively communicated with the heat trace main pipe.

Preferably, the heat tracing branch pipe for exchanging heat with the caustic soda tank is a second heat tracing branch pipe, and the second heat tracing branch pipe is fixedly connected with the caustic soda tank.

Preferably, the second heat tracing branch pipe is spirally wound on the outer wall of the caustic soda pot along the height direction of the caustic soda pot.

Preferably, the entrance end of the second heat tracing branch pipe is higher than the exit end.

Preferably, the number of the second heat trace branch pipes is at least one.

Preferably, a plurality of the second heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

Preferably, the heat tracing branch pipe for exchanging heat with the outer wall of the ash collecting hopper is a third heat tracing branch pipe, and the third heat tracing branch pipe is fixedly connected with the outer wall of the ash collecting hopper.

Preferably, the third heat tracing branch pipe is spirally wound on the outer wall of the ash collecting hopper along the height direction of the ash collecting hopper.

Preferably, the inlet end of the third heat tracing branch pipe is higher than the outlet end.

Preferably, the number of the third heat trace branch pipes is at least one.

Preferably, a plurality of the third heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

Preferably, the heat tracing branch pipe for exchanging heat with the outer wall of the ash collecting hopper is a fourth heat tracing branch pipe, and the fourth heat tracing branch pipe is fixedly connected with the outer wall of the ash collecting hopper.

Preferably, the fourth heat tracing branch pipe is spirally wound on the outer wall of the ash collecting hopper along the height direction of the ash collecting hopper.

Preferably, the inlet end of the fourth heat tracing branch pipe is higher than the outlet end.

Preferably, the number of the fourth heat trace branch pipes is at least one.

Preferably, a plurality of the fourth heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

Preferably, the heat tracing branch pipe for exchanging heat with the outer wall of the bucket elevator is a fifth heat tracing branch pipe, and the fifth heat tracing branch pipe is fixedly connected with the outer wall of the bucket elevator.

Preferably, the fifth heat tracing branch pipe extends and is fixed on the outer wall of the bucket elevator along the height direction of the bucket elevator.

Preferably, the inlet end of the fifth heat tracing branch pipe is higher than the outlet end.

Preferably, the number of the fifth heat trace branch pipes is at least one.

Preferably, a plurality of the fifth heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

Preferably, the bucket elevator is integrally quadrangular, and the four side walls of the bucket elevator are provided with fifth heat tracing branch pipes.

Preferably, the heat tracing branch pipe for exchanging heat with the spiral outer wall of the bin top is a sixth heat tracing branch pipe, and the sixth heat tracing branch pipe is fixedly connected with the spiral outer wall of the bin top.

Preferably, the sixth heat tracing branch pipe is spirally wound on the spiral outer wall of the bin top along the length direction of the bin top spiral.

Preferably, the number of the sixth heat tracing branch pipes is at least one.

Preferably, a plurality of the sixth heat tracing branch pipes are respectively communicated with the steam main pipe.

Preferably, the heat tracing branch pipe for exchanging heat with the outer wall of the fly ash bin is a seventh heat tracing branch pipe, and the seventh heat tracing branch pipe is fixedly connected with the outer wall of the fly ash bin.

Preferably, the seventh heat tracing branch pipe is spirally wound on the outer wall of the fly ash bin along the height direction of the fly ash bin.

Preferably, the seventh heat tracing branch pipe inlet end is higher than the outlet end.

Preferably, the number of the seventh heat trace branch pipes is at least one.

Preferably, a plurality of the seventh heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

Preferably, the heat tracing branch pipe for exchanging heat with the outer wall of the first ash conveying chain is an eighth heat tracing branch pipe, and the eighth heat tracing branch pipe is fixedly connected with the outer wall of the first ash conveying chain.

Preferably, the eighth heat trace branch pipe extends along the length direction of the first ash conveying chain.

Preferably, the number of the eighth heat trace branch pipes is at least one.

Preferably, a plurality of the eighth heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

Preferably, the eighth heat tracing branch pipes are respectively arranged on the outer walls of two horizontal sides of the first ash conveying chain along the length direction.

Preferably, the eighth heat tracing branch pipes positioned on the outer walls of the two horizontal sides of the first ash conveying chain in the length direction are close to the bottom of the first ash conveying chain.

Preferably, the heat tracing branch pipe for exchanging heat with the outer wall of the second ash conveying chain is a ninth heat tracing branch pipe, and the ninth heat tracing branch pipe is fixedly connected with the outer wall of the second ash conveying chain.

Preferably, the ninth heat trace branch pipe extends along the length direction of the second ash conveying chain.

Preferably, the number of the ninth heat trace branch pipes is at least one.

Preferably, a plurality of the ninth heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

Preferably, the ninth heat tracing branch pipes are respectively arranged on the outer walls of the two horizontal sides and the outer wall of the bottom of the second ash conveying chain along the length direction.

Preferably, the ninth heat tracing branch pipes positioned on the outer walls of the two horizontal sides of the second ash conveying chain in the length direction are close to the bottom of the second ash conveying chain.

Preferably, the heat tracing branch pipe for exchanging heat with the outer wall of the public ash conveying chain is a tenth heat tracing branch pipe, and the tenth heat tracing branch pipe is fixedly connected with the outer wall of the public ash conveying chain.

Preferably, the tenth heat trace branch pipe extends along the length direction of the common ash conveying chain.

Preferably, the number of the tenth heat trace branch pipes is at least one.

Preferably, a plurality of the tenth heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

Preferably, the tenth heat tracing branch pipes are respectively arranged on the outer walls of two horizontal sides of the common ash conveying chain along the length direction.

Preferably, the tenth heat tracing branch pipes positioned on the outer walls of the two horizontal sides of the common ash conveying chain in the length direction are close to the bottom of the common ash conveying chain.

Preferably, the common ash conveying chain comprises a first ash conveying chain, a second ash conveying chain and a third ash conveying chain.

Preferably, the heat tracing branch pipe is a stainless steel pipe or a copper pipe.

Preferably, the joints at the two ends of the heat tracing branch pipe are clamping sleeve-threaded joints.

Preferably, the joints at the two ends of the heat tracing branch pipe are copper heads or stainless steel heads.

Preferably, the heat tracing branch pipe and the heat exchange equipment are welded and fixed through intermittent welding.

Preferably, heat-conducting daub is arranged between the heat tracing branch pipe and the heat exchange equipment.

In the above-mentioned context of the present application, the individual preferences or even preferences may be combined with one another.

To sum up, the utility model discloses following beneficial effect has:

one takes out steam, boiler blow-off water and all comes from the msw incineration power generation in-process, for electric heating, the utility model discloses with one take out steam, boiler blow-off water's waste heat recovery to for the equipment heat supply of above-mentioned needs heating, practiced thrift the electric energy, satisfied "energy saving and emission reduction"'s purpose and "sustainable development" requirement.

Drawings

Fig. 1 is a schematic view of the working flow of the present invention;

FIG. 2 is a schematic view of the flue gas treatment process of the present invention;

FIG. 3 is a schematic diagram showing the distribution of the first heat tracing branch pipe on the urea tank;

FIG. 4 is a schematic view showing the distribution of the third heat tracing branch pipe on the cooling tower;

FIG. 5 is a schematic diagram of the distribution of the fourth heat tracing branch pipe on the bag-type dust collector;

FIG. 6 is a schematic view of the fly ash delivery process of the present invention;

FIG. 7 is a schematic diagram of the heat tracing system of the present invention;

FIG. 8 is a schematic view showing the distribution of the second heat tracing branch pipe on the caustic soda pot according to the present invention;

FIG. 9 is a schematic view showing the distribution of the fifth heat tracing branch pipe on the bucket elevator of the present invention;

FIG. 10 is a schematic view showing the distribution of the sixth heat tracing branch pipe on the top spiral of the bin of the present invention;

FIG. 11 is a schematic view showing the distribution of the seventh heat tracing branch pipe on the fly ash bin;

FIG. 12 is a schematic view showing the distribution of the eighth heat tracing branch pipe on the first ash conveying chain according to the present invention;

FIG. 13 is a schematic view showing the distribution of the ninth heat tracing branch pipe on the second ash conveying chain;

FIG. 14 is a schematic view showing the distribution of the tenth heat tracing branch pipe on the common ash conveying chain according to the present invention;

FIG. 15 is a schematic sectional view of the heat tracing branch pipe according to the present invention;

fig. 16 is a position distribution diagram of the middle ash conveying chain and the fly ash solidification system of the present invention.

Reference numerals: 1. a flue gas purification system; 2. a dust conveying chain; 21. a first ash conveying chain; 22. a second ash conveying chain; 23. a public ash conveying chain; 3. a fly ash solidification system; 31. a bucket elevator; 32. the top of the bin is spiral; 33. fly ash bin; 34. spiral fly ash; 35. a fly ash solidification chamber; 4. a heat tracing system; 401. a heat tracing main pipe; 402. a first heat tracing branch pipe; 403. a second heat tracing branch pipe; 404. a third heat tracing branch pipe; 405. a fourth heat tracing branch pipe; 406. a fifth heat tracing branch pipe; 407. a sixth heat tracing branch pipe; 408. seventh heat tracing branch pipes; 409. eighth heat tracing branch pipes; 410. a ninth heat tracing branch pipe; 411. a tenth heat tracing branch pipe; 412. a hot water tank; 413. a steam main pipe; 5. a cooling tower; 51. an ash collecting hopper; 52. a spray chamber; 6. a bag-type dust collector; 61. a cloth bag bin; 62. a dust collecting hopper; 7. a wet scrubber tower; 8. an activated carbon adsorption tower; 9. an SNCR system; 10. a caustic soda tank; 11. a urea tank; 12. and (4) heat-conducting daub.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A waste incineration flue gas treatment system with energy-saving heat tracing is shown in figures 1 and 2 and comprises a flue gas purification system 1, an ash conveying chain 2, a fly ash solidification system 3 and a heat tracing system 4, wherein the flue gas purification system 1 is used for purifying flue gas generated by an incinerator in a power generation process, the ash conveying chain 2 is used for conveying fly ash formed when the flue gas purification system 1 purifies the flue gas, the fly ash solidification system 3 is used for storing and solidifying the fly ash, and the heat tracing system 4 is used for maintaining the working temperature of relevant equipment in the flue gas purification system 1, the ash conveying chain 2 and the fly ash solidification system 3.

The flue gas purification system 1 sequentially comprises a cooling tower 5, a bag-type dust remover 6, a wet washing tower 7 and an active carbon adsorption tower 8 from upstream to downstream, the flue gas purification system 1 further comprises an SNCR (selective non-catalytic reduction) system 9 and a caustic soda tank 10, the flue gas sequentially passes through the cooling tower 5, the bag-type dust remover 6, the wet washing tower 7 and the active carbon adsorption tower 8, wherein the SNCR system 9 is used for treating nitrogen oxides in the flue gas, the cooling tower 5 is used for reducing the temperature and the dust concentration of the flue gas, the bag-type dust remover 6 is used for treating acid gases and dust particles in the flue gas, the wet washing tower 7 is used for further treating the acid gases in the flue gas, and the flue gas can reach the emission standard after being treated by the flue gas purification system 1 for emission.

As shown in fig. 2 and 3, 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 by the urea pump, the urea spray gun is connected with the incinerator, and urea is extracted from the urea tank 11 by the urea pump and sprayed into the incinerator through the urea spray gun.

As shown in fig. 2 and 4, the high-temperature flue gas treated by the SNCR method in the incinerator enters the cooling tower 5, the cooling tower 5 includes an ash collecting hopper 51 and a spray chamber 52, wherein the ash collecting hopper 51 is located below the spray chamber 52, one end of the side wall of the spray chamber 52 close to the ash collecting hopper 51 is a flue gas inlet end of the cooling tower 5, one end of the side wall of the spray chamber 52 far away from the ash collecting hopper 51 is a flue gas outlet end of the cooling tower 5, the flue gas outlet end of the cooling tower 5 is connected with a downstream bag-type dust collector 6, the top of the spray chamber 52 is provided with an atomized water spray gun, the bottom of the ash collecting hopper 51 is provided with a scraping valve, the atomized water spray gun sprays atomized cooling water to the high-temperature flue gas to cool, and the fly ash falls to the bottom of the ash.

As shown in fig. 2 and fig. 5, the flue gas cooled by the condensed water in the cooling tower 5 enters the bag-type dust collector 6 for dry deacidification, the bag-type dust collector 6 comprises an ash collecting hopper 62 and a bag bin 61, wherein the ash collecting hopper 62 is located below the bag bin 61, a dust collecting bag is arranged between the bag bin 61 and the ash collecting hopper 62, one end of the side wall of the bag bin 61 close to the ash collecting hopper 62 is a flue gas inlet end of the bag-type dust collector 6, one end of the side wall of the bag bin 61 far away from the ash collecting hopper 62 is a flue gas outlet end of the bag-type dust collector 6, the flue gas inlet end and the flue gas outlet end of the bag-type dust collector 6 are respectively located at two sides of the dust collecting bag, the flue gas outlet end of the bag-type dust collector 6 is connected with the downstream wet washing tower 7, the top of the bag bin 61 is provided with a compressed air pulse device, the bottom of the ash collecting hopper 62 is provided with a, then is discharged out of the bag-type dust collector 6 through a gate valve.

As shown in fig. 2, the flue gas after the dry acid removal enters a wet scrubber 7 for wet acid removal, the wet scrubber 7 is provided with a circulating caustic soda pump, the bottom of a caustic soda tank 10 is communicated with the wet scrubber 7, the top of the caustic soda tank 10 is communicated with the top of the wet scrubber 7 through the circulating caustic soda pump, caustic soda solution in the caustic soda tank 10 enters the wet scrubber 7 from the top thereof by driving of the circulating caustic soda pump, and flows back to the caustic soda tank 10 after falling, acid gas in the flue gas is further removed by reaction with the caustic soda solution, and the flue gas after the acid removal enters an activated carbon adsorption tower 8 for dust removal and moisture removal and then is discharged.

As shown in fig. 6, 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, the fly ash discharged from the bag-type dust collector 6 enters the second ash conveying chain 22, the fly ash in the first ash conveying chain 21 is conveyed to the common ash conveying chain 23, the fly ash in the second ash conveying chain 22 is conveyed to the common ash conveying chain 23, and the fly ash in the common ash conveying chain 23 is conveyed to the bucket elevator 31.

The fly ash solidification system 3 comprises a bucket elevator 31, a top bin screw 32, a fly ash bin 33, a fly ash screw 34 and a fly ash solidification chamber 35 from upstream to downstream, wherein the bucket elevator 31 is positioned at one end of a public ash conveying chain 23, the public ash conveying chain 23 conveys fly ash to the bucket elevator 31, the bucket elevator 31 lifts the fly ash to the top bin screw 32, the top bin screw 32 conveys the fly ash to the fly ash bin 33, and when the fly ash in the fly ash bin 33 is accumulated to a certain degree, the fly ash screw 34 conveys the fly ash to the fly ash solidification chamber 35 for subsequent treatment.

As shown in fig. 7, the heat tracing system 4 includes a heat tracing main pipe 401, heat tracing branch pipes, and a hot water tank 412, the heat tracing main pipe 401 and the heat tracing branch pipes are communicated, boiler blow-off water is stored in the hot water tank 412, the hot water tank 412 is connected with the heat tracing main pipe 401 through a circulating water pump, a steam main pipe 413 is arranged on the heat tracing main pipe 401, the other end of the steam main pipe 413 is connected with a steam turbine for receiving steam, a switch valve for switching on and off the steam main pipe 413 is arranged on the steam main pipe 413, the steam main pipe 413 is closed through the switch valve in summer, the boiler blow-off water in the hot water tank 412 is used as a heat exchange medium in the heat tracing system 4, the heat tracing system 4 is driven by the circulating water pump to carry out internal circulation, the steam main pipe 413 is opened through the switch valve in winter, a pumped steam introduced from the steam turbine by the steam main pipe 413 in the heat tracing system 4 is used as a heat exchange medium, the pumped steam is high-pressure steam, and can be, the water after the steam condensation enters the hot water tank 412, and the heat tracing branch pipes respectively provide heat tracing for the urea tank 11, the caustic soda tank 10, the ash collecting hopper 51, the ash collecting hopper 62, the bucket elevator 31, the bin top screw 32, the ash flying bin 33, the first ash conveying chain 212, the second ash conveying chain 222 and the public ash conveying chain 232.

As shown in fig. 3, the heat tracing branch pipes for exchanging heat with the urea tank 11 are first heat tracing branch pipes 402, the first heat tracing branch pipes 402 are fixedly connected with the urea tank 11, the first heat tracing branch pipes 402 are spirally wound on the outer wall of the urea tank 11 along the height direction of the urea tank 11, the inlet end of each first heat tracing branch pipe 402 is higher than the outlet end of each first heat tracing branch pipe 402, for installation convenience, the number of the first heat tracing branch pipes 402 is multiple, preferably, the number of the first heat tracing branch pipes 402 is two, and the two first heat tracing branch pipes 402 are respectively communicated with the heat tracing main pipe 401.

As shown in fig. 8, the heat tracing branch pipes for exchanging heat with the caustic soda tank 10 are the second heat tracing branch pipes 403, the second heat tracing branch pipes 403 are fixedly connected with the caustic soda tank 10, the second heat tracing branch pipes 403 are spirally wound on the outer wall of the caustic soda tank 10 along the height direction of the caustic soda tank 10, the inlet ends of the second heat tracing branch pipes 403 are higher than the outlet ends, the number of the second heat tracing branch pipes 403 is multiple, preferably, three second heat tracing branch pipes 403 are provided, and the three second heat tracing branch pipes 403 are respectively communicated with the heat tracing main pipe 401.

As shown in fig. 4, the heat tracing branch pipes for exchanging heat with the outer wall of the ash collecting bucket 51 are the third heat tracing branch pipes 404, the third heat tracing branch pipes 404 are fixedly connected with the outer wall of the ash collecting bucket 51, the third heat tracing branch pipes 404 are spirally wound on the outer wall of the ash collecting bucket 51 along the height direction of the ash collecting bucket 51, the inlet end of the third heat tracing branch pipes 404 is higher than the outlet end, the number of the third heat tracing branch pipes 404 is multiple, preferably, the number of the third heat tracing branch pipes 404 is four, and the four third heat tracing branch pipes 404 are respectively communicated with the heat tracing main pipe 401.

As shown in fig. 5, the heat tracing branch pipes for exchanging heat with the outer wall of the ash collecting bucket 62 are fourth heat tracing branch pipes 405, the fourth heat tracing branch pipes 405 are fixedly connected with the outer wall of the ash collecting bucket 62, the fourth heat tracing branch pipes 405 are spirally wound on the outer wall of the ash collecting bucket 62 along the height direction of the ash collecting bucket 62, the inlet end of the fourth heat tracing branch pipes 405 is higher than the outlet end, the number of the fourth heat tracing branch pipes 405 is multiple, preferably, the number of the third heat tracing branch pipes 404 is three, and the three fourth heat tracing branch pipes 405 are respectively communicated with the heat tracing main pipe 401.

As shown in fig. 9, the heat tracing branch pipes for exchanging heat with the outer wall of the bucket elevator 31 are fifth heat tracing branch pipes 406, the fifth heat tracing branch pipes 406 are fixedly connected with the outer wall of the bucket elevator 31, the fifth heat tracing branch pipes 406 extend and are fixed on the outer wall of the bucket elevator 31 along the height direction of the bucket elevator 31, the inlet end of each fifth heat tracing branch pipe 406 is higher than the outlet end, the number of the fifth heat tracing branch pipes 406 is multiple, the multiple fifth heat tracing branch pipes 406 are respectively communicated with the heat tracing main pipe 401, preferably, the whole bucket elevator 31 is quadrangular, and the four side walls of the bucket elevator 31 are respectively provided with three fifth heat tracing branch pipes 406.

As shown in fig. 10, the sixth heat tracing branch pipe 407 is used for exchanging heat with the outer wall of the top auger 32, the sixth heat tracing branch pipe 407 is fixedly connected with the outer wall of the top auger 32, the sixth heat tracing branch pipe 407 is spirally wound on the outer wall of the top auger 32 along the length direction of the top auger 32, the number of the sixth heat tracing branch pipes 407 is multiple, preferably, the number of the sixth heat tracing branch pipes 407 is two, and the two sixth heat tracing branch pipes 407 are respectively communicated with the steam main pipe 413.

As shown in fig. 11, the seventh heat tracing branch pipe 408 is used for exchanging heat with the outer wall of the fly ash bin 33, the seventh heat tracing branch pipe 408 is fixedly connected with the outer wall of the fly ash bin 33, the seventh heat tracing 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 inlet end of the seventh heat tracing branch pipe 408 is higher than the outlet end, the number of the seventh heat tracing branch pipes 408 is multiple, preferably, the number of the seventh heat tracing branch pipes 408 is seven, and the seven seventh heat tracing branch pipes 408 are respectively communicated with the heat tracing main pipe 401.

As shown in fig. 12, the heat tracing branch pipe for exchanging heat with the outer wall of the first ash conveying chain 21 is an eighth heat tracing branch pipe 409, the eighth heat tracing branch pipe 409 is fixedly connected with the outer wall of the first ash conveying chain 21, the eighth heat tracing branch pipe 409 extends along the length direction of the first ash conveying chain 21, the number of the eighth heat tracing branch pipes 409 is multiple, the multiple eighth heat tracing branch pipes 409 are respectively communicated with the heat tracing main pipe 401, the multiple eighth heat tracing branch pipes 409 are respectively arranged on the outer walls of two horizontal sides of the length direction of the first ash conveying chain 21 and near the bottom of the first ash conveying chain 21, and preferably, three eighth heat tracing branch pipes 409 are respectively arranged on each side.

As shown in fig. 13, the ninth heat tracing branch pipes 410 are heat tracing branch pipes 410 for exchanging heat with the outer wall of the second ash conveying chain 22, the ninth heat tracing branch pipes 410 are fixedly connected with the outer wall of the second ash conveying chain 22, the ninth heat tracing branch pipes 410 extend along the length direction of the second ash conveying chain 22, the number of the ninth heat tracing branch pipes 410 is multiple, the multiple ninth heat tracing branch pipes 410 are respectively communicated with the heat tracing main pipe 401, the multiple ninth heat tracing branch pipes 410 are respectively arranged on the outer walls of the two horizontal sides of the second ash conveying chain 22 along the length direction and near the bottom of the second ash conveying chain 22, preferably, the ninth heat tracing branch pipes 410 are also arranged at the bottom of the second ash conveying chain 22, wherein the outer walls of the two horizontal sides are respectively provided with two ninth heat tracing branch pipes 410, and the bottom is provided with three ninth heat tracing branch pipes 410.

As shown in fig. 14, the heat tracing branch pipes for exchanging heat with the outer wall of the common ash conveying chain 23 are tenth heat tracing branch pipes 411, the tenth heat tracing branch pipes 411 are fixedly connected with the outer wall of the common ash conveying chain 23, the tenth heat tracing branch pipes 411 extend along the length direction of the common ash conveying chain 23, the number of the tenth heat tracing branch pipes 411 is multiple, multiple ones of the tenth heat tracing branch pipes 411 are respectively communicated with the heat tracing main pipes 401, multiple ones of the tenth heat tracing branch pipes 411 are respectively arranged on the outer walls of two horizontal sides of the common ash conveying chain 23 along the length direction and near the bottom of the common ash conveying chain 23, and preferably, three of the tenth heat tracing branch pipes 411 are respectively arranged on each side.

As shown in fig. 15, the heat tracing branch pipe is made of a stainless steel pipe or a copper pipe, the heat tracing branch pipe and the heat exchange equipment are fixed by intermittent welding, in order to increase the heat conduction capability between the heat tracing branch pipe and the heat exchange equipment, as shown in the figure, heat conduction daub 12 is filled between the heat tracing branch pipe and the equipment, and both ends of the heat tracing branch pipe are provided with clamping sleeves and threaded joints which are made of copper or stainless steel forgings.

As shown in fig. 1 and 16, in an embodiment in which four furnace independently operated systems are used to generate power, the four incinerators respectively correspond to four groups of cooling towers 5 and bag-type dust collectors 6, the four groups of cooling towers 5 and bag-type dust collectors 6 share one group of common ash conveying chain 232 and a fly ash solidification system 3, the cooling towers 5 and the bag-type dust collectors 6 in the four groups of flue gas purification systems 1 are sequentially distributed along the length direction of the common ash conveying chain 232, in order to increase the ash discharging efficiency of the bag-type dust collector 6, two rows of six ash collecting hoppers 62 are arranged in each bag-type dust collector 6, the two rows of ash collecting hoppers 62 under each bag-type dust collector 6 correspond to the two second ash conveying chains 22 respectively, the two second ash conveying chains 22 respectively convey 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 four first ash conveying chains 21, eight second ash conveying chains 22, and one common ash conveying chain 23 for conveying the fly ash generated in the flue gas purification process of the cooling tower 5 and the bag-type dust collector 6.

To sum up, the utility model discloses with a steam of taking out that the garbage power generation in-process produced, boiler blow-off water retrieval and utilization, utilize the waste heat of a steam of taking out, boiler blow-off water to maintain the operating temperature of equipment, the loss of the electric energy of reduction system in this maintenance equipment operating temperature aspect has satisfied the purpose of "energy saving and emission reduction" and the requirement of "sustainable development".

The present invention is not limited to the above embodiment, and those skilled in the art can make modifications to the embodiment as required without inventive contribution after reading the present specification, but all the modifications are protected by patent laws within the scope of the claims of the present invention.

Claims

1. A waste incineration flue gas treatment system with energy-saving heat tracing is characterized by comprising a flue gas purification system, an ash conveying chain, a fly ash solidification system and a heat tracing system;

the flue gas purification system sequentially comprises a cooling tower, a bag-type dust collector, a wet washing tower and an activated carbon adsorption tower from upstream to downstream, and also comprises an SNCR system and a caustic soda tank;

2. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 1, wherein a steam main pipe for receiving steam is arranged on the heat tracing main pipe.

3. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 1, wherein the heat tracing branch pipe for exchanging heat with the urea tank is a first heat tracing branch pipe, and the first heat tracing branch pipe is fixedly connected with the urea tank.

4. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 3, wherein the first heat tracing branch pipe is spirally wound on the outer wall of the urea tank along the height direction of the urea tank.

5. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 3, wherein the inlet end of the first heat tracing branch pipe is higher than the outlet end.

6. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 3, wherein the number of the first heat tracing branch pipes is at least one.

7. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 1, wherein the heat tracing branch pipe for exchanging heat with the caustic soda tank is a second heat tracing branch pipe, and the second heat tracing branch pipe is fixedly connected with the caustic soda tank.

8. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 7, wherein the second heat tracing branch pipe is spirally wound on the outer wall of the caustic soda pot along the height direction of the caustic soda pot.

9. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 7, wherein the inlet end of the second heat tracing branch pipe is higher than the outlet end.

10. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 7, wherein the number of the second heat tracing branch pipes is at least one.

11. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 1, wherein the cooling tower comprises a spray chamber and an ash collecting hopper, the heat tracing branch pipe for exchanging heat with the outer wall of the ash collecting hopper is a third heat tracing branch pipe, and the third heat tracing branch pipe is fixedly connected with the outer wall of the ash collecting hopper.

12. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 11, wherein the third heat tracing branch pipe is spirally wound on the outer wall of the ash collecting hopper along the height direction of the ash collecting hopper.

13. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 11, wherein the inlet end of the third heat tracing branch pipe is higher than the outlet end.

14. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 11, wherein the number of the third heat tracing branch pipes is at least one.

15. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 1, wherein the bag-type dust collector comprises a bag bin and an ash collecting hopper, the heat tracing branch pipe for exchanging heat with the outer wall of the ash collecting hopper is a fourth heat tracing branch pipe, and the fourth heat tracing branch pipe is fixedly connected with the outer wall of the ash collecting hopper.

16. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 15, wherein the fourth heat tracing branch pipe is spirally wound on the outer wall of the ash collecting hopper in the height direction of the ash collecting hopper.

17. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 15, wherein the inlet end of the fourth heat tracing branch pipe is higher than the outlet end.

18. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 15, wherein the number of the fourth heat tracing branch pipes is at least one.

19. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 1, wherein the heat tracing branch pipe for exchanging heat with the outer wall of the bucket elevator is a fifth heat tracing branch pipe, and the fifth heat tracing branch pipe is fixedly connected with the outer wall of the bucket elevator.

20. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 19, wherein the fifth heat tracing branch pipe extends along the height direction of the bucket elevator and is fixed on the outer wall of the bucket elevator.

21. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 19, wherein the inlet end of the fifth heat tracing branch pipe is higher than the outlet end.

22. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 19, wherein the number of the fifth heat tracing branch pipes is at least one.

23. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 19, wherein a plurality of the fifth heat tracing branch pipes are respectively communicated with the heat tracing main pipe.

24. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 19, wherein the bucket elevator is quadrangular in whole, and the four side walls of the bucket elevator are provided with fifth heat tracing branch pipes.

25. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 1, wherein the heat tracing branch pipe for exchanging heat with the outer wall of the bin top spiral is a sixth heat tracing branch pipe, and the sixth heat tracing branch pipe is fixedly connected with the outer wall of the bin top spiral.

26. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 25, wherein the sixth heat tracing branch pipe is spirally wound on the spiral outer wall of the bin top along the length direction of the bin top spiral.

27. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 25, wherein the number of the sixth heat tracing branch pipes is at least one.

28. The system of claim 1, wherein the heat tracing branch pipe for exchanging heat with the outer wall of the fly ash bin is a seventh heat tracing branch pipe, and the seventh heat tracing branch pipe is fixedly connected with the outer wall of the fly ash bin.

29. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 28, wherein the seventh heat tracing branch pipe is spirally wound on the outer wall of the fly ash bin along the height direction of the fly ash bin.

30. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 28, wherein the inlet end of the seventh heat tracing branch pipe is higher than the outlet end.

31. The waste incineration flue gas treatment system with energy saving and heat tracing as claimed in claim 28, wherein the number of the seventh heat tracing branch pipes is at least one.

32. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 1, wherein the ash conveying chain comprises a first ash conveying chain, a second ash conveying chain and a common ash conveying chain, the first ash conveying chain is communicated with the cooling tower, the second ash conveying chain is communicated with the bag-type dust remover, 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 with the common ash conveying chain, and one end of the common ash conveying chain in the ash conveying direction is connected with the bucket elevator.

33. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 32, wherein the heat tracing branch pipe for exchanging heat with the outer wall of the first ash conveying chain is an eighth heat tracing branch pipe, and the eighth heat tracing branch pipe is fixedly connected with the outer wall of the first ash conveying chain.

34. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 33, wherein the eighth heat tracing branch pipe extends along the length direction of the first ash conveying chain.

35. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 33, wherein the number of the eighth heat tracing branch pipes is at least one.

36. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 33, wherein the eighth heat tracing branch pipes are respectively disposed on outer walls of two horizontal sides of the first ash conveying chain in the length direction.

37. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 33, wherein the eighth heat tracing branch pipes on the outer walls of the two horizontal sides of the first ash conveying chain in the length direction are close to the bottom of the first ash conveying chain.

38. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 32, wherein the heat tracing branch pipe for exchanging heat with the outer wall of the second ash conveying chain is a ninth heat tracing branch pipe, and the ninth heat tracing branch pipe is fixedly connected with the outer wall of the second ash conveying chain.

39. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 38, wherein the ninth heat tracing branch pipe extends along the length direction of the second ash conveying chain.

40. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 38, wherein the number of the ninth heat tracing branch pipes is at least one.

41. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 38, wherein the ninth heat tracing branch pipes are respectively disposed on the outer walls of two horizontal sides and the outer wall of the bottom of the second ash conveying chain in the length direction.

42. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 38, wherein the ninth heat tracing branch pipes on the outer walls of the two horizontal sides of the second ash conveying chain in the length direction are close to the bottom of the second ash conveying chain.

43. The waste incineration flue gas treatment system with the energy-saving heat tracing function of claim 32, wherein the heat tracing branch pipe for exchanging heat with the outer wall of the public ash conveying chain is a tenth heat tracing branch pipe, and the tenth heat tracing branch pipe is fixedly connected with the outer wall of the public ash conveying chain; the tenth heat tracing branch pipe extends along the length direction of the public ash conveying chain.

44. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 43, wherein the number of the tenth heat tracing branch pipes is at least one.

45. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 43, wherein the tenth heat tracing branch pipes are respectively arranged on the outer walls of two horizontal sides of the common ash conveying chain in the length direction.

46. The waste incineration flue gas treatment system with the energy-saving heat tracing function as claimed in claim 43, wherein the tenth heat tracing branch pipes on the outer walls of the two horizontal sides of the public ash conveying chain in the length direction are close to the bottom of the public ash conveying chain.

47. The waste incineration flue gas treatment system with the energy-saving heat tracing function according to claim 1, wherein the heat tracing branch pipe is welded and fixed with one or more of a urea tank, a caustic soda tank, a cooling tower, a bag-type dust collector, an ash conveying chain, a bucket elevator, an ash flying bin and a bin top screw by adopting interrupted welding.

48. The waste incineration flue gas treatment system according to claim 47, wherein heat-conducting cement gum is arranged between the heat-tracing branch pipe and one or more of the urea tank, the caustic soda tank, the cooling tower, the bag-type dust collector, the ash conveying chain, the bucket elevator, the ash flying bin and the bin top screw.