CN109945677A - A kind of efficient flue gas waste heat recovery tower with desulfurizing function - Google Patents
A kind of efficient flue gas waste heat recovery tower with desulfurizing function Download PDFInfo
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- CN109945677A CN109945677A CN201910225072.9A CN201910225072A CN109945677A CN 109945677 A CN109945677 A CN 109945677A CN 201910225072 A CN201910225072 A CN 201910225072A CN 109945677 A CN109945677 A CN 109945677A
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Abstract
A kind of efficient flue gas waste heat recovery tower with desulfurizing function belongs to thermal power plant boiler flue gas waste heat recovery and utilizes technical field.The flue gas come out from deduster carries out waste heat recycling and desulfurization process, high-temperature flue gas is entered in tower by flue gas waste heat recovery tower bottom, successively pass through packing layer, recirculated water spraying layer, demister and demister cleaning system from bottom to top, is directly contacted with Sprayer Circulation water and carry out counterflow heat exchange.SO during this in fume afterheat and flue gas2It is absorbed with dust particle by recirculated water, into tower bottom, after NaOH neutralisation treatment, part recirculated water continues to participate in circulation along circulation line, is recycled using plate heat exchanger to fume afterheat.Flue gas waste heat recovery tower in the present invention uses flue gas and water direct contact type heat transfer technology, improve heat and mass effect, enhance exchange capability of heat, desulphurizing ability is had both simultaneously, it can be realized flue gas waste heat recovery and desulfurization integrated function, reduce power plant's initial cost, realizes the further purification of flue gas.
Description
Technical field
The invention belongs to Hazards in Power Plant and burning coal boiler room gas cleaning and flue gas waste heat recovery and technical field is utilized,
Be related specifically to it is a kind of fume afterheat is used for central heating, while having both the efficient flue gas waste heat recovery tower of desulfurizing function.
Background technique
The exhaust gas temperature design value of steam power plant's coal-burning boiler is generally arranged at 120~140 DEG C, and the heat carried accounts for about pot
Furnace input heat 3%~8%, this partial heat is often wasted, be the main reason for causing boiler thermal efficiency low it
One.And the pollution of discharged from coal-fired boiler bring is also one of the inducement that Heating Season haze takes place frequently, it is therefore necessary to specially research and develop needle
Flue gas waste heat recovery and flue gases purification to coal-burning boiler.
At present to the recycling of fume afterheat mainly for the Exposure degree of high-temperature flue gas, however the recycling of sensible heat only accounts for
The fraction of total heat recovery, a large amount of condensation latent heats are contained in low-temperature flue gas, and waste heat recycling has a high potential.According to mediate contact
Flue gas waste heat recovery apparatus based on formula heat exchanger recycles low-temperature flue gas waste heat, big, low-temperature corrosion that there are required heat exchange areas
The problems such as, economy is poor.And low-temperature flue gas is sprayed to the flue gas waste heat recovery tower based on direct-contact heat exchanger
Condensation, makes flue gas and low temperature water direct contact heat-exchanging, then can increase heat transfer area, and it is net to play flue gas while promoting heat transfer efficiency
The effect of change.On the other hand, the common wet desulfurizing process of steam power plant is the form for using desulfurization slurry and flue gas adverse current to spray,
High-temperature flue gas is after the spray system of desulfurizing tower, and temperature reduces, and part sensible heat is as desulfurization process is lost to ring
In border.If waste-heat recovery device is separately independently arranged with desulphurization system, not only waste heat recovering effect is not good enough, increases power plant and throws
Money, and the waste heat directly in the low temperature and high relative humidity flue gas of recycling desulfurizing tower out, technical difficulty are larger.
In view of the above problems, a kind of efficient flue gas waste heat recovery tower for having both desulfurizing function is designed, by desulphurization system and cigarette
Gas residual neat recovering system merges, and is the effective means for realizing steam power plant's energy-saving and emission-reduction.
Summary of the invention
It is an object of the invention to propose a kind of efficient flue gas waste heat recycling for having both desulfurizing function for coal-burning boiler
Tower, to solve the problem low, less economical using system waste heat recovery efficiency of off-gas recovery in the prior art.Meanwhile this hair
Waste heat recovery tower in bright has both desulphurizing ability, can reach the desulfurization requirement of steam power plant, can be used for further decreasing dirt
Object discharge is contaminated, power station environment benefit is promoted.To realize above-mentioned target, technical solution of the present invention:
A kind of efficient flue gas waste heat recovery tower with desulfurizing function, including demister 2, demister cleaning system 3, recirculated water
Spraying layer 4, packing layer 5, desulfurizing agent entrance 6, waste heat circulation water pump 7, desulfurizing agent delivery pump 8, condensate collection system 9, flue gas
Entrance valve 10, gas bypass pipeline valve 11, check-valves 12, mating flue, pipeline and various valves；
Packing layer 5, recirculated water spraying layer 4, demister are disposed with inside efficient flue gas waste heat recovery tower from top to bottom
Cleaning system 3 and demister 2；
The high-temperature flue gas that boiler room generates enters cigarette through smoke inlet section valve 10 along pipeline after by dust removal and filtration
Gas waste heat recovery tower 1, from bottom to top, recirculated water is by the spray equipment in recirculated water spraying layer 4 from upper for high-temperature flue gas flow direction
And lower sprinkling, high-temperature flue gas through packing layer 5 and shower water carry out gas-liquid two-phase and come into full contact with to achieve the effect that heat and mass, make be
System smoke evacuation is cooled to dew-point temperature hereinafter, water recovery heat release in flue gas, the low humidity flue gas after heat exchange are removed through demister 2
Water mist, clean dry flue gas is from exhanst gas outlet section discharge at the top of efficient flue gas waste heat recovery tower, and into chimney, fume afterheat is followed
Ring water absorbs；
The demister 2 is arranged in parallel using wave template, and the parallel airflow that may make up flue gas between adjacent wave-shape board is logical
Road, the droplet in flue gas deviate the flow direction of air-flow under effect of inertia, impinge upon on wave template and separated；
The demister 2 is rinsed equipped with demister cleaning system 3 using one layer of process water, and process water is controlled through valve
Into demister 2；
The recirculated water spraying layer 4 is mainly responsible for 101, more laterals, nozzle connecting pipe 108, nozzle 105 by spray
It is formed with support base 106, recirculated water spraying layer 4 is fixed on desulfurizing tower tower body 107 by support base 106, more annular points
Branch pipe(tube) is fixedly mounted on support base 106, and spray supervisor 101 communicates with each lateral；Nozzle 105 passes through nozzle connecting pipe
108 are evenly arranged on lateral, guarantee nozzle on entire cross-sectional area without spray blind area；It comes out from heat exchanger through exchanging heat
Recirculated water after cooling enters in spray supervisor 101 by outer loop pipeline section 100, flows through the nozzle 105 on each lateral,
It realizes uniformly spray, exchanges heat with flue gas；
105 material of nozzle uses silicon carbide.
Described filler layer 5 is filled using plastics porous ball, provides sufficient contact surface for gas and liquid two phases, promoted flue gas and
Heat and mass effect between Sprayer Circulation water；
Desulfurizing agent solution by desulfurizing agent delivery pump 8 along pipeline through valve, check-valves 12 by efficient flue gas waste heat recovery tower bottom
The desulfurizing agent entrance 6 in portion inputs in efficient flue gas waste heat recovery tower, after exchanging with Sprayer Circulation water completion caloic, in flue gas
S02Gas is dissolved in recirculated water, and exothermic condensation, condensed water imitate flue gas waste heat recovery in reinforcement to the vapor in flue gas simultaneously
Tower bottom and desulfurizing agent react to achieve the purpose that partial desulfurization, and the remaining tiny particles content in flue gas also will be in water
Stream is trapped in efficient flue gas waste heat recovery tower under washing away, further purifying smoke；
The condensed water a part of efficient flue gas waste heat recycling tower bottom after processing continues to participate in circulation as recirculated water,
Remaining part point finally recycles tower bottom from efficient flue gas waste heat and enters condensate collection system 9, the condensed water of recycling through valve control
As water is used in factory, to realize water-saving purpose；
High temperature circulation water with flue gas heat exchange and after water process is from efficient flue gas waste heat recycling tower bottom by waste heat circulation
Water pump successively passes through valve, waste heat circulation water pump 7, valve and send to water water plate heat exchanger and heat supply network return water and exchange heat；Through changing
Heat low temperature exhaust heat recirculated water after cooling returns in efficient flue gas waste heat recovery tower along pipeline to be continued to exchange heat with flue gas spray；
When efficient flue gas waste heat recovery tower needs to overhaul, flue gas section inlet valve 10 is closed, setting is opened and is leading to cigarette
The gas bypass pipeline valve 11 between pipeline that chimney and deduster come out, the flue gas come out from deduster 2 are directly arranged by chimney
Out；
It is direct by the high temperature circulation water come out in efficient flue gas waste heat recovery tower when waste heat circulation water pump 7 is overhauled
Enter recirculated water spraying layer 4, circulated sprinkling heat exchange by valve control；
It is set between heat exchanger import and export pipeline and valve is set, when anti-corrosion High-efficient Water water plate heat exchanger is overhauled
When, valve is directly passed through by the high temperature circulation water come out in efficient flue gas waste heat recovery tower and enters recirculated water spraying layer 4, circulation spray
Leaching heat exchange.
Beneficial effects of the present invention: the present invention uses the direct contact type heat recovery technology of flue gas and water, and combines high
Imitate water --- water plate heat exchanger realizes the recycling and utilization to low-temperature flue gas waste heat, the core component fume afterheat in the present invention
Recovery tower uses one layer of packing layer Jing Guo optimization design, so that flue gas flow rate distribution is more uniform in tower, increases
The contact area of fume afterheat shower water and time of contact improve the heat and mass of flue gas and water, enhance exchange capability of heat.This
The SO in flue gas can also be effectively reduced in flue gas waste heat recovery tower in invention simultaneously2With the content of tiny particles content, effectively drop
Low PM2.5 discharge, has both desulfurizing function, and desulfurizing tower need not be additionally arranged in power plant again, realizes that collection flue gas waste heat recovery and flue gas are de-
The technology that sulphur dedusting is integrated saves power plant's initial cost.The present invention can will be more than flue gas by water water plate heat exchanger in Heating Season
Heat enhances the heat capacity of steam power plant, improves efficiency of energy utilization, reduce the ring of steam power plant for heating heat supply network return water
Border influences, and has both economic benefit and environmental benefit.
Detailed description of the invention
Fig. 1 is the efficient flue gas waste heat recovery tower schematic diagram of the invention with desulfurizing function.
Fig. 2 is spraying layer arrangement of nozzles form schematic diagram in flue gas waste heat recovery tower.
In figure: 1 flue gas waste heat recovery tower；2 demisters；3 demister cleaning systems；4 recirculated water spraying layers；5 packing layers；6
Desulfurizing agent entrance；7 waste heat circulation water pumps；8 desulfurizing agent delivery pumps；9 condensate collection systems；10 smoke inlet section valves；11 cigarettes
Gas bypass duct valve；12 check-valves；13~20 valves；100 outer loop pipeline sections；101 spray supervisors；102 exterior annulars point
Branch pipe(tube)；103 intermediate annular laterals；104 interior annular laterals；105 nozzles；106 support bases；107 desulfurizing tower towers
Body.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
As shown in Figure 1, the high-temperature flue gas that generates of boiler room by after dust removal and filtration along pipeline through smoke inlet section valve
Door 10 enters flue gas waste heat recovery tower 1, and from bottom to top, recirculated water is filled by the spray in recirculated water spraying layer 4 in flow of flue gas direction
It sets and sprays from top to bottom, flue gas comes into full contact with through packing layer 5 and shower water progress gas-liquid two-phase and achievees the effect that heat and mass, makes
System smoke evacuation is cooled to dew-point temperature hereinafter, water recovery heat release in flue gas, the low humidity flue gas after heat exchange are clear through demister
It washes system 3 and demister 2 removes water mist, clean dry flue gas discharge at the top of waste heat recovery tower, into chimney, fume afterheat quilt
Sprayer Circulation water absorbs；
The desulfurizing agent solution prepared by desulfurizing agent delivery pump 8 along pipeline through valve 19, check-valves 12 by desulfurizing agent entrance 6
It send to flue gas waste heat recovery tower 1.S0 after being exchanged with Sprayer Circulation water completion caloic, in flue gas2Gas is dissolved in circulation
In water, exothermic condensation, condensed water react to reach the vapor in flue gas in waste heat recycling tower bottom with desulfurizing agent simultaneously
To the purpose of partial desulfurization, the remaining tiny particles content in flue gas will be also trapped in recovery tower under current scour, into one
Step has purified flue gas；
In Heating Period, as heat supply network return water temperature ThLower, recovery tower leaving water temperature TtcIn higher situation, and Ttc>Th, two
When person's temperature difference meets the minimum temperature difference of heat exchanger needs, temperature ThHeat supply network return water enter subsequent anti-corrosion High-efficient Water --- water plate
It in formula heat exchanger, exchanges heat with the high temperature circulation water come out in flue gas waste heat recovery tower 1, absorbs fume afterheat, temperature rises
ΔT1If (T at this timeh+ΔT1)≥Tg, then heating system heat is supplied by fume afterheat completely at this time；If (T at this timeh+ΔT1)<
Tg, heat supply network return water is by anti-corrosion High-efficient Water --- it is further heated after the heating of water plate heat exchanger into heat exchangers for district heating, directly
To reaching the supply water temperature T for meeting service requirementgAfter send to heat supply network, but heating amount only needs to meet temperature rise Tg-(Th+ΔT1) i.e.
Can, therefore the steam extraction amount of heat exchangers for district heating can be greatly decreased；
Fig. 2 show spraying layer arrangement of nozzles form in flue gas waste heat recovery tower, in figure: outer loop pipeline section 100, supervisor
Road 101, exterior annular lateral 102, intermediate annular lateral 103, interior annular lateral 104, nozzle 105, branch
Support seat 106 and desulfurizing tower tower body 107；
The Sprayer Circulation water is sent into main pipeline 101 by outer loop pipeline section 100, is successively connected with main pipeline 101
Each looped branch pipeline sent by nozzle connecting pipe 108 to nozzle 105, exterior annular lateral 102, intermediate annular branch
Pipeline 103, interior annular lateral 104 are equally spaced along tower body cross sectional inner diameter, and nozzle 105 is uniformly distributed
On the entire cross section of desulfurizing tower tower body 107, come into full contact with shower water with flue gas, no spray blind area, improve heat exchange and
Desulfuration efficiency.The nozzle connecting pipe 103 is extended vertically down from lateral.The support base 106 is arranged in spray tube
Road decentralization, can be improved the stability of spray equipment.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of efficient flue gas waste heat recovery tower with desulfurizing function, which is characterized in that the efficient flue gas waste heat recovery tower
Including demister (2), demister cleaning system (3), recirculated water spraying layer (4), packing layer (5), desulfurizing agent entrance (6), waste heat
Water circulating pump (7), desulfurizing agent delivery pump (8), condensate collection system (9), smoke inlet section valve (10), gas bypass pipeline
Valve (11), check-valves (12), mating flue, pipeline and various valves；
Packing layer (5), recirculated water spraying layer (4), demister are disposed with inside efficient flue gas waste heat recovery tower from top to bottom
Cleaning system (3) and demister (2)；
The high-temperature flue gas that boiler room generates enters flue gas through smoke inlet section valve (10) along pipeline after by dust removal and filtration
Waste heat recovery tower 1, from bottom to top, recirculated water is by the spray equipment in recirculated water spraying layer (4) from upper for high-temperature flue gas flow direction
And lower sprinkling, high-temperature flue gas come into full contact with through packing layer (5) and shower water progress gas-liquid two-phase and achieve the effect that heat and mass, make
System smoke evacuation is cooled to dew-point temperature hereinafter, water recovery heat release in flue gas, the low humidity flue gas after heat exchange is through demister (2)
Water mist is removed, clean dry flue gas is from exhanst gas outlet section discharge at the top of efficient flue gas waste heat recovery tower, into chimney, fume afterheat
It is absorbed by recirculated water；
The demister (2) is arranged in parallel using wave template, may make up the parallel gas flow channels of flue gas between adjacent wave-shape board,
Droplet in flue gas deviates the flow direction of air-flow under effect of inertia, impinges upon on wave template and is separated；
The demister (2) is rinsed equipped with demister cleaning system (3) using one layer of process water, and process water is controlled through valve
Into demister (2)；
The recirculated water spraying layer (4) is mainly responsible for (101), more laterals, nozzle connecting pipe (108), nozzle by spray
(105) it is fixed on desulfurizing tower tower body (107) with support base (106) composition, recirculated water spraying layer (4) by support base (106),
More annular laterals are fixedly mounted on support base (106), and spray supervisor (101) communicates with each lateral；Nozzle
(105) it is evenly arranged on lateral by nozzle connecting pipe (108), guarantees that nozzle is blind without spraying on entire cross-sectional area
Area；The recirculated water after cooling that exchanged heat is come out from heat exchanger to enter in spray supervisor (101) by outer loop pipeline section (100),
The nozzle (105) on each lateral is flowed through, uniformly spray is realized, exchanges heat with flue gas；
Desulfurizing agent solution by desulfurizing agent delivery pump (8) along pipeline through valve, check-valves (12) by efficient flue gas waste heat recovery tower bottom
In desulfurizing agent entrance (6) the input efficient flue gas waste heat recovery tower in portion, after being exchanged with Sprayer Circulation water completion caloic, in flue gas
S02Gas is dissolved in recirculated water, and exothermic condensation, condensed water imitate flue gas waste heat recovery in reinforcement to the vapor in flue gas simultaneously
Tower bottom and desulfurizing agent react to achieve the purpose that partial desulfurization, and the remaining tiny particles content in flue gas also will be in water
Stream is trapped in efficient flue gas waste heat recovery tower under washing away, further purifying smoke；
The condensed water a part of efficient flue gas waste heat recycling tower bottom after processing continues to participate in circulation, remaining part as recirculated water
Divide and finally recycle tower bottom through valve control into condensate collection system (9) from efficient flue gas waste heat, the condensed water of recycling is made
To use water in factory, to realize water-saving purpose；
High temperature circulation water with flue gas heat exchange and after water process is from efficient flue gas waste heat recycling tower bottom by waste heat circulation water pump
Successively send to water water plate heat exchanger and heat supply network return water and exchange heat by valve, waste heat circulation water pump (7), valve；Through exchanging heat
Low temperature exhaust heat recirculated water after cooling returns in efficient flue gas waste heat recovery tower along pipeline to be continued to exchange heat with flue gas spray.
2. efficient flue gas waste heat recovery tower according to claim 1, which is characterized in that when efficient flue gas waste heat recovery tower needs
It when overhauling, closes flue gas section inlet valve (10), opens the cigarette for being arranged in and leading between the pipeline that chimney and deduster come out
Gas bypass duct valve (11), the flue gas come out from deduster are directly discharged by chimney.
3. efficient flue gas waste heat recovery tower according to claim 1 or 2, which is characterized in that when waste heat circulation water pump (7) into
When row maintenance, is directly controlled by valve by the high temperature circulation water come out in efficient flue gas waste heat recovery tower and enter circulation water spray
Layer (4), circulated sprinkling heat exchange.
4. efficient flue gas waste heat recovery tower according to claim 1 or 2, which is characterized in that be set to heat exchanger import and export
Valve is set between pipeline, when anti-corrosion High-efficient Water water plate heat exchanger is overhauled, by going out in efficient flue gas waste heat recovery tower
The high temperature circulation water come directly passes through valve and enters recirculated water spraying layer (4), circulated sprinkling heat exchange.
5. efficient flue gas waste heat recovery tower according to claim 3, which is characterized in that be set to heat exchanger import and export pipe
Valve is set between road, when anti-corrosion High-efficient Water water plate heat exchanger is overhauled, by coming out in efficient flue gas waste heat recovery tower
High temperature circulation water directly pass through valve and enter recirculated water spraying layer (4), circulated sprinkling heat exchange.
6. according to claim 1, efficient flue gas waste heat recovery tower described in 2 or 5, which is characterized in that described nozzle (105) material
Matter uses silicon carbide.
7. efficient flue gas waste heat recovery tower according to claim 3, which is characterized in that described nozzle (105) material is adopted
Use silicon carbide.
8. efficient flue gas waste heat recovery tower according to claim 4, which is characterized in that described nozzle (105) material is adopted
Use silicon carbide.
9. according to claim 1, efficient flue gas waste heat recovery tower described in 2,5,7 or 8, which is characterized in that described filler layer (5)
It is filled using plastics porous ball, provides sufficient contact surface for gas and liquid two phases, the heat transfer promoted between flue gas and Sprayer Circulation water passes
Matter effect.
10. efficient flue gas waste heat recovery tower according to claim 6, which is characterized in that described filler layer (5) uses plastics
Porous ball filling provides sufficient contact surface for gas and liquid two phases, promotes the heat and mass effect between flue gas and Sprayer Circulation water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910225072.9A CN109945677A (en) | 2019-03-25 | 2019-03-25 | A kind of efficient flue gas waste heat recovery tower with desulfurizing function |
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| CN201910225072.9A CN109945677A (en) | 2019-03-25 | 2019-03-25 | A kind of efficient flue gas waste heat recovery tower with desulfurizing function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111366026A (en) * | 2020-04-09 | 2020-07-03 | 烟台龙源电力技术股份有限公司 | LNG gasification heat exchange tower and LNG gasification system |
| CN112742147A (en) * | 2020-12-14 | 2021-05-04 | 湖南福千府生物科技有限公司 | Burner gas purification and dust removal device for sodium sulfite preparation |
| CN117308678A (en) * | 2023-09-05 | 2023-12-29 | 广东恒生石化实业有限公司 | Waste heat recovery device of flue gas desulfurization tower |
| CN117563415A (en) * | 2024-01-15 | 2024-02-20 | 内蒙古广聚新材料有限责任公司 | Fine desulfurization device and method in methanol production process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366026A (en) * | 2020-04-09 | 2020-07-03 | 烟台龙源电力技术股份有限公司 | LNG gasification heat exchange tower and LNG gasification system |
| CN112742147A (en) * | 2020-12-14 | 2021-05-04 | 湖南福千府生物科技有限公司 | Burner gas purification and dust removal device for sodium sulfite preparation |
| CN117308678A (en) * | 2023-09-05 | 2023-12-29 | 广东恒生石化实业有限公司 | Waste heat recovery device of flue gas desulfurization tower |
| CN117308678B (en) * | 2023-09-05 | 2024-03-26 | 广东恒生石化实业有限公司 | Waste heat recovery device of flue gas desulfurization tower |
| CN117563415A (en) * | 2024-01-15 | 2024-02-20 | 内蒙古广聚新材料有限责任公司 | Fine desulfurization device and method in methanol production process |
| CN117563415B (en) * | 2024-01-15 | 2024-03-22 | 内蒙古广聚新材料有限责任公司 | Fine desulfurization device and method in methanol production process |
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