CN107218618A - A kind of smoke waste heat comprehensive utilization system and its method - Google Patents

A kind of smoke waste heat comprehensive utilization system and its method Download PDF

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Publication number
CN107218618A
CN107218618A CN201710408703.1A CN201710408703A CN107218618A CN 107218618 A CN107218618 A CN 107218618A CN 201710408703 A CN201710408703 A CN 201710408703A CN 107218618 A CN107218618 A CN 107218618A
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CN
China
Prior art keywords
flue gas
heat exchange
phase transformation
smoke
oxygen
Prior art date
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Pending
Application number
CN201710408703.1A
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Chinese (zh)
Inventor
毛双华
林国辉
祝云飞
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Zhejiang Ju Hua Thermal Power Co Ltd
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Zhejiang Ju Hua Thermal Power Co Ltd
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Priority to CN201710408703.1A priority Critical patent/CN107218618A/en
Publication of CN107218618A publication Critical patent/CN107218618A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
    • F22B1/167—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour using an organic fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

Abstract

The invention discloses a kind of smoke waste heat comprehensive utilization system, including at least two groups flue gas waste heat utilization devices, flue gas waste heat utilization device includes the boiler being sequentially connected, back-end ductwork, air preheater, dry collector, first air-introduced machine, gas cooler, wet desulfuration tower, heat exchanger is condensed in phase transformation, second air-introduced machine, smoke re-heater and chimney, heat exchanger is condensed in phase transformation, gas cooler, smoke re-heater is respectively arranged with phase transformation cohesion heat exchange module, flue gas cooling heat transferring module and flue gas reheat heat exchange module, heat exchange module is condensed in each group phase transformation, each group flue gas cooling heat transferring module and each group flue gas reheat heat exchange module are connected in parallel respectively.The invention also discloses the method that flue gas is handled using the system.The present invention is simple in construction, while realizing power-plant flue gas high-effective dust-removing, Water Sproading, improving the thermal efficiency and eliminating the target of white cigarette.

Description

A kind of smoke waste heat comprehensive utilization system and its method
Technical field
The invention belongs to coal fired power plant energy-conserving and environment-protective technical fiel, and in particular to a kind of smoke waste heat comprehensive utilization system and Its method.
Background technology
At present, coal is as the principal mode of China's energy, and its burning can produce substantial amounts of particulate matter, although existing fire coal The boiler and Industrial Boiler in power station have all installed cleaner additional in back-end ductwork, and domestic more ripe processing method has machinery to remove Dirt, electric precipitation, dust removal by filtration, wet dust removal, but legacy equipment to fine particle, especially particle diameter distribution at 0.1~2 μm Removal effect is very poor, and these fine particles are discharged into air and are difficult deposition, easily cause haze, destroy atmospheric environment, Health is damaged, the coal fired power plant minimum discharge policy of country's appearance can not have been met.At this stage, fine particle is controlled The developing direction of technology is mainly through physically or chemically acting on after cohesion is grown up and removed.The general principle of cohesion is to utilize The outer field actions such as sound field, electric field, magnetic field and spray into the measures such as a small amount of chemical agglomerator in flue gas to promote between fine particle Effective collision contact promote its reunions to grow up, and utilization saturation vapour it is long in the cohesion that the coring of fine particle surface condenses It is big etc..
Sonic agglomeration is middle micron and submicron particles is increased their collision rate by high intensity sound field, further Cohesion is grown up；Electrocoagulation is, by being that subparticle is powered, other larger particle surfaces to be reached with electrophoretic, so as to strengthen The collision agglomeration effect of intergranular；Magnetic cohesion is that subparticle is magnetized under magnetic field force, and relative fortune occurs under magnetic field gradient power Move and collide and reunite together；Chemical coagulation is subparticle cohesion is grown up by adding adsorbent.But above-mentioned technology is thrown Provide high operating cost, operation energy consumption height, system configuration complicated, it is also possible to cause secondary pollution.Therefore, a kind of system is stable, high The dedusting technology of effect energy-conservation is the development trend of energy-conserving and environment-protective at this stage.
Meanwhile, the problem of domestic coal-burning boiler back-end ductwork generally existing exhaust gas temperature is higher, wet desulfurization system outlet Flue-gas temperature is 50~55 DEG C, and wherein vapor accounts for 12%~18%, and flue gas is in saturation or hypersaturated state.If directly led to Cross chimney and be discharged into environment, not only result in water resource waste, influence the heat-economy in power station, and a large amount of white cigarettes, shadow can be formed Ring power plant's image.Once wide variety of GGH can eliminate white cigarette with lifting exhaust gas temperature, but flue gas still contains after desulfurizing tower A small amount of SO2、SO3, now temperature is already below acid dew point, and the dust that metal can occur in serious low-temperature corrosion, flue gas is easy in gold Belong to heat exchanger surface fouling, so GGH is progressively eliminated.
Coal fired power plant is wanted to reach high-effective dust-removing, Water Sproading, the effect for eliminating white cigarette simultaneously, and single unit needs three sets not Same equipment, number of devices needed for many units is huge, total investment is huge, operating cost is high, system design is complicated.Therefore, grind Studying carefully the integrated circulatory system of low, the easy to operate multicomputer collaboration of a kind of simple system of design, specific consumption has great reality Meaning.
The content of the invention
In order to overcome the complexity of environmental protection and energy-saving system at this stage, it is an object of the invention to provide a kind of high-effective dust-removing, water Reclaim, improve power plant thermal efficiency and eliminate the smoke waste heat comprehensive utilization system and its method of chimney white cigarette.
The technical solution adopted by the present invention is：A kind of smoke waste heat comprehensive utilization system, including at least two groups fume afterheats Using device, described flue gas waste heat utilization device is removed including the boiler being sequentially connected, back-end ductwork, air preheater, dry type Dirt device, the first air-introduced machine, gas cooler, wet desulfuration tower, phase transformation cohesion heat exchanger, the second air-introduced machine, smoke re-heater and Chimney, described phase transformation condenses heat exchanger, gas cooler, smoke re-heater and is respectively arranged with phase transformation cohesion heat exchange module, cigarette Air cooling heat exchange module and flue gas reheat heat exchange module, it is characterised in that the import of the phase transformation cohesion heat exchange module described in each group is simultaneously Connection is connected to the outlet of normal temperature sweet-water tank, and the outlet of the phase transformation cohesion heat exchange module described in each group is connected in parallel to demineralized water connection First import of case, the inlet parallel of the flue gas cooling heat transferring module described in each group is connected to the first of described desalination water manifold Outlet, the outlet of the flue gas cooling heat transferring module described in each group is connected in parallel to the first import of oxygen-eliminating device, described oxygen-eliminating device First outlet be connected with the feed-water inlet of described boiler, the connection of the inlet parallel of the flue gas reheat heat exchange module described in each group To the second outlet of described oxygen-eliminating device, the outlet of the flue gas reheat heat exchange module described in each group is connected in parallel to described desalination Second import of water manifold.
As the preferred embodiment of the present invention, the outlet of described normal temperature sweet-water tank is bypassed by normal temperature sweet-water tank It is connected to the first import of described desalination water manifold.
As the preferred embodiment of the present invention, heat exchanger is condensed in the bottom of described wet desulfuration tower with described phase transformation Bottom by desulfurization melt pit be connected.
As the preferred embodiment of the present invention, described phase transformation cohesion heat exchanger, gas cooler, smoke re-heater Heat exchanger tube material is PTFE.
As the preferred embodiment of the present invention, the heat exchanger tube of described phase transformation cohesion heat exchanger is into U-shaped arrangement, stagger arrangement cloth Put；The heat exchanger tube into U-shaped arrangement, in-line arrangement of described gas cooler and smoke re-heater.
The invention also discloses the method that flue gas is handled using the smoke waste heat comprehensive utilization system, by flue gas successively through each Boiler, back-end ductwork, air preheater, dry collector, the first air-introduced machine, gas cooler, the wet desulfuration tower of group device Demineralized water is heated temperature rise after into phase transformation cohesion heat exchanger, with demineralized water heat-shift, and flue-gas temperature declines, and saturation is wet The condensation phase transformation of flue gas makes vapor be condensed on fine particle surface, while producing thermophoresis and diffusiophoresis effect, subparticle Travel motion, mutual making contact constantly grow up after by heat exchanger tube surface collection, under gravity, with flowing finally Liquid film is communicated to desulfurizing tower melt pit through water collector, and kind of dust drops to 5mg/Nm3Hereinafter, condense and exchange heat from phase transformation Flue gas after the cooling that device comes out is under the second air inducing machine travel, into smoke re-heater, is carried out with demineralized water after heat exchange Be heated to more than 80 DEG C, white cigarette be eliminated after from chimney qualified discharge, it is characterised in that the demineralized water after heat exchange through many simultaneously The outlet of the phase transformation cohesion heat exchange module of connection is entered from the first inlet header of desalination water manifold after desalination water manifold, a part Many gas coolers in parallel are branched to as Second cold resource further to be heated by flue gas, make demineralized water be warming up to 100 DEG C with On, then the first import through oxygen-eliminating device converges into oxygen-eliminating device；A high temperature demineralized water part in oxygen-eliminating device through oxygen-eliminating device the One outlet enters the feed water system of boiler, and a part of second outlet through oxygen-eliminating device branches to many smoke re-heaters in parallel and carried out Flue gas is circulated after reheating into demineralized water header.
As the preferred embodiment of the present invention, the bypass of desalination water manifold is set in described desalination water manifold, it is described Desalination water manifold is connected to the first import of described oxygen-eliminating device, desalination after heat exchange by described desalination water manifold bypass The outlet that water condenses heat exchange module through many phase transformations in parallel enters demineralized water connection from the first inlet header of desalination water manifold After case, a part of demineralized water is bypassed the first import through oxygen-eliminating device by described desalination water manifold and be directly entered oxygen-eliminating device.
As the preferred embodiment of the present invention, steam is set to aid in heating import in described oxygen-eliminating device, when in flue gas If flue-gas temperature is not up to more than 80 DEG C when flue gas reheating is carried out in reheater, open described steam auxiliary heat into Mouth heating demineralized water, the flue gas then distributed according to each unit operating mode after desalination water-carrying capacity, heating cooling dedusting dehumidification.
As the preferred embodiment of the present invention, the demineralized water initial temperature is 10-20 DEG C, and flow is 100~200t/ h。
As the preferred embodiment of the present invention, the flow of the flue gas is 100000~600000Nkm3/h。
The smoke waste heat comprehensive utilization system main flow of the present invention enters to provide demineralized water by demineralized water workshop Normal temperature sweet-water tank is supplied to the phase transformation cohesion heat exchanger of every unit respectively, and condensation dedusting, dust are carried out to wet flue gas after desulfurization Desulfurization trench is flowed into by condensation water out to be recycled, after demineralized water heating, concentrate and enter desalination water manifold, one with condensate Partial deionization water respectively enters the gas cooler of every unit, and a part flows directly into oxygen-eliminating device, and demineralized water is respectively enterd often Concentrated after being heated again after the gas cooler of platform unit and enter connection boiler feedwater system in outlet at oxygen-eliminating device, oxygen-eliminating device one System, every unit smoke re-heater of another place outlet connection, carries out reheating, if desalination coolant-temperature gage is unable to reach elimination to flue gas The minimum temperature of chimney white cigarette, then need using steam auxiliary heating demineralized water, high temperature demineralized water heating neat stress is eliminated after white cigarette Concentration returns to desalination water manifold and recycled again.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the nucleus equipment of smoke waste heat comprehensive utilization system of the invention be phase transformation cohesion heat exchanger, gas cooler and Smoke re-heater, three equipment are all pipe heat exchangers, and flue body is as heat exchanger shell, and production technology is identical, can module Metaplasia is produced, and operation principle is identical, and system architecture is simple, easy for installation.
2nd, smoke waste heat comprehensive utilization system of the invention is using demineralized water as heat carrier, by the flue gas of many units of full factory Residual heat integrative is utilized, and can plan as a whole to allocate the heat energy reclaimed according to different unit operating modes, realizes that the flue gas ash removal of whole factory, water are returned Receive, eliminate chimney white cigarette, not only improve the image appearance of coal fired power plant, saved water resource, reduce dust emission concentration, And fume afterheat is efficiently make use of, the desalination coolant-temperature gage into the feed water system of boiler greatly improves full factory's heat more than 100 DEG C Efficiency.
3rd,, can be independent if single devices break down in smoke waste heat comprehensive utilization system running of the invention Isolation, does not influence whole system, and operation maneuverability, specific consumption are low, produced without waste water, waste gas, non-secondary pollution.
4th, smoke waste heat comprehensive utilization system of the invention heat exchange tubing can solve the punching of metallic recuperator fouling and clogging very well Brush problem, anti-aging, anticorrosion, maintenance cost is low, and service life is up to 20 years, and playing the saving energy, raising boiler safety can By the effect of property.
5th, smoke waste heat comprehensive utilization system of the invention has reclaimed water, efficient removal cigarette while fume afterheat is absorbed Fine particle, mercury, SO in gas3, the pollutant such as aerosol, further purifying smoke is stripped of pollutant, net after processing Not mercurous in flue gas to wait heavy metal, dust emission is less than 4.2mg/Nm3, dust size is below 1.0 μm, and content of sulfur dioxide exists 10mg/Nm3Hereinafter, amount of nitrogen oxides is in 10mg/Nm3Below.
Brief description of the drawings
Fig. 1 is the demineralized water workflow schematic diagram of the smoke waste heat comprehensive utilization system of the present invention.
Schematic flow sheets of the Fig. 2 for smoke waste heat comprehensive utilization system of the invention in single fighter.
Fig. 3 condenses heat exchanger, gas cooler, smoke re-heater for the smoke waste heat comprehensive utilization system phase transformation of the present invention Layout drawing in single fighter.
Fig. 4 condenses heat exchanger, gas cooler, smoke re-heater for the smoke waste heat comprehensive utilization system phase transformation of the present invention The structural representation of individual module.
In figure, 1 is normal temperature sweet-water tank, and 2 be that heat exchanger is condensed in phase transformation, and 3 be the bypass of normal temperature sweet-water tank, and 4 be demineralized water Header, 5 be gas cooler, and 6 be the bypass of desalination water manifold, and 7 be steam auxiliary heating import, and 8 be oxygen-eliminating device, 9 be flue gas again Hot device, 10 be boiler, and 11 be back-end ductwork, and 12 be air preheater, and 13 be dry collector, and 14 be the first air-introduced machine, and 15 are Wet desulfuration tower, 16 be desulfurization melt pit, and 17 be chimney, and 18 be heat exchange module import, and 19 be heat exchange module outlet, and 20 be to pass a bridge Curved, 21 be automatic cleaning spray system, and 22 be tube sheet floral disc, and 23 be heat exchanger tube, and 24 be water collector, and 25 be the second air-introduced machine, 2-1 is that heat exchange module is condensed in phase transformation, and 5-1 is flue gas cooling heat transferring module, and 9-1 is flue gas reheat heat exchange module.
Embodiment
It is expanded on further the present invention with reference to the accompanying drawings and examples, embodiment is only used for that the present invention will be described, and Be not construed as limiting the scope of claims, it may occur to persons skilled in the art that other alternative means, the present invention power In sharp claimed range.
As shown in drawings, a kind of smoke waste heat comprehensive utilization system, including at least two groups flue gas waste heat utilization devices, flue gas Residual heat using device is drawn including the boiler 10 being sequentially connected, back-end ductwork 11, air preheater 12, dry collector 13, first Blower fan 14, gas cooler 5, wet desulfuration tower 15, phase transformation cohesion heat exchanger 2, the second air-introduced machine 25, smoke re-heater 9 and cigarette Chimney 17, phase transformation cohesion heat exchanger 2, gas cooler 5, smoke re-heater 9 are respectively arranged with phase transformation cohesion heat exchange module 2-1, cigarette Air cooling heat exchange module 5-1 and flue gas reheat heat exchange module 9-1, each group phase transformation cohesion heat exchange module 2-1 inlet parallel connection To the outlet of normal temperature sweet-water tank 1, each group phase transformation cohesion heat exchange module 2-1 outlet is connected in parallel to the of desalination water manifold 4 One import, each group flue gas cooling heat transferring module 5-1 inlet parallel is connected to the first outlet of desalination water manifold 4, each group flue gas Cooling heat transferring module 5-1 outlet is connected in parallel to the first import of oxygen-eliminating device 8, first outlet and the boiler 10 of oxygen-eliminating device 8 Feed-water inlet is connected, and each group flue gas reheat heat exchange module 9-1 inlet parallel is connected to the second outlet of oxygen-eliminating device 8, each group cigarette Gas reheating heat exchange module 9-1 outlet is connected in parallel to the second import of desalination water manifold.The outlet of normal temperature sweet-water tank 1 passes through Normal temperature sweet-water tank bypass 3 is connected to the first import of desalination water manifold 4.Desalination water manifold 4 bypasses 6 simultaneously by desalination water manifold It is connected to the first import of oxygen-eliminating device 8.Oxygen-eliminating device 8 is provided with steam auxiliary heating import 7.The bottom of wet desulfuration tower 15 and phase transformation The bottom for condensing heat exchanger 2 is connected by desulfurization melt pit 16.
Operating procedure is：Demineralized water from demineralized water workshop enters normal temperature sweet-water tank 1, and shunting introduces many simultaneously The phase transformation cohesion heat exchange module 2-1 of the phase transformation cohesion heat exchanger 2 of connection import；Heat smoke successively through boiler 10, back-end ductwork 11, Air preheater 12, dry collector 13, the first air-introduced machine 14, gas cooler 5, wet desulfuration tower 15 enter phase transformation cohesion and changed Demineralized water is heated temperature rise, heat smoke temperature drop, saturation wet flue gas after hot device 2, with the demineralized water heat-shift of flowing Condensation phase transformation make vapor fine particle surface condense, while produce thermophoresis and diffusiophoresis effect, subparticle migration Motion, mutual making contact constantly grow up after by the surface collection of heat exchanger tube 23, under gravity, with the liquid of flowing finally Film is communicated to desulfurizing tower melt pit 16 through water collector 24, and dust concentration drops to 5mg/Nm3Below；Heat exchanger 2 is condensed from phase transformation The flue gas after cooling out is under the traction of the second air-introduced machine 25, into smoke re-heater 9, is carried out with demineralized water after heat exchange Be heated to more than 80 DEG C, white cigarette be eliminated after from the qualified discharge of chimney 17.Demineralized water after heating is through phase transformation cohesion heat exchange mould Block 2-1 outlet enters desalination water manifold 4 from the first inlet header of desalination water manifold 4, and then a part of demineralized water passes through Desalination water manifold bypasses 6 the first imports through oxygen-eliminating device 8 and is directly entered oxygen-eliminating device 8, and a part branches to many flue gases in parallel Cooler 5 is further heated as Second cold resource by heat smoke, further heats up demineralized water, and first then through oxygen-eliminating device 8 Import converges into oxygen-eliminating device 8；First outlet of the high temperature demineralized water part through oxygen-eliminating device 8 enters the feed water system of boiler, a part Second outlet through oxygen-eliminating device 8 branches to many smoke re-heaters 9 in parallel and carries out flue gas reheating, and flue gas is by high temperature demineralized water More than 80 DEG C are heated to, white cigarette is eliminated and then from the qualified discharge of chimney 17, if temperature, which is not up to, can eliminate the minimum of white cigarette Temperature (80 DEG C), then open the steam auxiliary heating heating demineralized water of import 7, then distribute desalination current according to each unit operating mode Neat stress after amount, heating cooling dedusting dehumidification；Demineralized water after temperature reduction is concentrated again to be followed into desalination water manifold 4 Ring.
Embodiment 1
A kind of smoke waste heat comprehensive utilization system, including two groups of flue gas waste heat utilization devices, flue gas waste heat utilization device bag Include the boiler 10 being sequentially connected, back-end ductwork 11, air preheater 12, dry collector 13, the first air-introduced machine 14, flue gas cooling Device 5, wet desulfuration tower 15, phase transformation cohesion heat exchanger 2, the second air-introduced machine 25, smoke re-heater 9 and chimney 17, phase transformation cohesion are changed Hot device 2, gas cooler 5, smoke re-heater 9 are respectively arranged with phase transformation cohesion heat exchange module 2-1, and (poly- heat exchange module is by material PTFE heat exchanger tubes are constituted, and PTFE heat exchanger tube specifications areHeat exchanger tube is connected using expanded joint technology, outside bobbin carriage sealing, heat exchange Pipe is staggered in arrangement into U-shaped arrangement), flue gas cooling heat transferring module 5-1 (heat exchange module by material be PTFE heat exchanger tubes constitute, PTFE Heat exchanger tube specification isHeat exchanger tube is connected using welding technique with tube sheet floral disc 22, tube sheet floral disc 22 and external metallization bobbin carriage Sealing, heat exchanger tube is into U-shaped arrangement, in-line arrangement) and flue gas reheat heat exchange module 9-1 (heat exchange module is PTFE heat exchange by material Pipe is constituted, and PTFE heat exchanger tube specifications areHeat exchanger tube is connected using welding technique with tube sheet floral disc 22, tube sheet floral disc 22 with External metallization bobbin carriage is sealed, and heat exchanger tube is into U-shaped arrangement, in-line arrangement), the inlet parallel of each group phase transformation cohesion heat exchange module is connected To the outlet of normal temperature sweet-water tank 1, each group phase transformation cohesion heat exchange module 2-1 outlet is connected in parallel to the of desalination water manifold 4 One import, each group flue gas cooling heat transferring module 5-1 inlet parallel is connected to the first outlet of desalination water manifold 4, each group flue gas Cooling heat transferring module 5-1 outlet is connected in parallel to the first import of oxygen-eliminating device 8, first outlet and the boiler 10 of oxygen-eliminating device 8 Feed-water inlet is connected, and each group flue gas reheat heat exchange module 9-1 inlet parallel is connected to the second outlet of oxygen-eliminating device 8, each group cigarette Gas reheating heat exchange module 9-1 outlet is connected in parallel to the second import of desalination water manifold.The outlet of normal temperature sweet-water tank 1 passes through Normal temperature sweet-water tank bypass 3 is connected to the first import of desalination water manifold 4.Desalination water manifold 4 bypasses 6 simultaneously by desalination water manifold It is connected to the first import of oxygen-eliminating device 8.Oxygen-eliminating device 8 is provided with steam auxiliary heating import 7.The bottom of wet desulfuration tower 15 and phase transformation The bottom for condensing heat exchanger 2 is connected by desulfurization melt pit 16.
The method that flue gas is handled using the system, is comprised the following steps：
(1) in each group flue gas waste heat utilization device, heat smoke is using flow as 300000Nkm3/ h is successively through each group cigarette Boiler 10, back-end ductwork 11, air preheater 12, dry collector 13, the first air-introduced machine 14, the flue gas of gas residual heat using device Cooler 5, wet desulfuration tower 15 enter phase transformation and condense the demineralized water heat-shift (desalination flowed in heat exchanger 2, with heat exchanger tube 23 Water inlet temperature is 13 DEG C, and every demineralized water inlet flow rate is 140t/h), the demineralized water after heat exchange is warming up to 28 DEG C, heat smoke Temperature drop is to 44 DEG C, and the condensation phase transformation of saturation wet flue gas makes vapor be condensed on fine particle surface, while producing thermophoresis With diffusiophoresis effect, subparticle travel motion, mutual making contact constantly grow up after by the surface collection of heat exchanger tube 23, finally Under gravity, as the liquid film of flowing through water collector 24 is communicated to desulfurizing tower melt pit 16, kind of dust declines To 5mg/Nm3Below；The flue gas after the cooling of heat exchanger 2 out is condensed under the traction of the second air-introduced machine 25 from phase transformation, into cigarette In gas reheater 9, more than 80 DEG C are heated to after carrying out heat exchange with demineralized water, white cigarette be eliminated after from the row up to standard of chimney 17 Put；The outlet that demineralized water after heating condenses heat exchange module 2-1 through phase transformation is entered from the first inlet header of desalination water manifold 4 Desalination water manifold 4, then a part of demineralized water 6 the first imports through oxygen-eliminating device 8 are bypassed by desalination water manifold and is directly entered and removes Oxygen device 8；A part branches to many gas coolers 5 in parallel as Second cold resource and further heated by heat smoke, makes desalination Coolant-temperature gage is warming up to 105 DEG C by 28 DEG C, and then the first import through oxygen-eliminating device 8 converges into oxygen-eliminating device 8；A high temperature demineralized water part First outlet through oxygen-eliminating device 8 enters the feed water system of boiler, a part of second outlet through oxygen-eliminating device 8 branch to many it is in parallel Smoke re-heater 9 carries out flue gas reheating, and demineralized water temperature drop concentrates to enter into desalination water manifold 4 to 70 DEG C or so, again Row circulation.
After testing, not mercurous in the neat stress after two boiler processing to wait heavy metal, dust emission is less than 3.5mg/Nm3, Dust size is below 1.0 μm, and content of sulfur dioxide is in 10mg/Nm3Hereinafter, amount of nitrogen oxides is in 10mg/Nm3Below.
Embodiment 2
A kind of smoke waste heat comprehensive utilization system, including three groups of flue gas waste heat utilization devices, flue gas waste heat utilization device bag Include the boiler 10 being sequentially connected, back-end ductwork 11, air preheater 12, dry collector 13, the first air-introduced machine 14, flue gas cooling Device 5, wet desulfuration tower 15, phase transformation cohesion heat exchanger 2, the second air-introduced machine 25, smoke re-heater 9 and chimney 17, phase transformation cohesion are changed Hot device 2, gas cooler 5, smoke re-heater 9 are respectively arranged with phase transformation cohesion heat exchange module 2-1, and (poly- heat exchange module is by material PTFE heat exchanger tubes are constituted, and PTFE heat exchanger tube specifications areHeat exchanger tube is connected using expanded joint technology, outside bobbin carriage sealing, heat exchange Pipe is staggered in arrangement into U-shaped arrangement), flue gas cooling heat transferring module 5-1 (heat exchange module by material be PTFE heat exchanger tubes constitute, PTFE Heat exchanger tube specification isHeat exchanger tube is connected using welding technique with tube sheet floral disc 22, tube sheet floral disc 22 and external metallization bobbin carriage Sealing, heat exchanger tube is into U-shaped arrangement, in-line arrangement) and flue gas reheat heat exchange module 9-1 (heat exchange module is PTFE heat exchange by material Pipe is constituted, and PTFE heat exchanger tube specifications areHeat exchanger tube is connected using welding technique with tube sheet floral disc 22, tube sheet floral disc 22 with External metallization bobbin carriage is sealed, and heat exchanger tube is into U-shaped arrangement, in-line arrangement), the inlet parallel of each group phase transformation cohesion heat exchange module is connected To the outlet of normal temperature sweet-water tank 1, each group phase transformation cohesion heat exchange module 2-1 outlet is connected in parallel to the of desalination water manifold 4 One import, each group flue gas cooling heat transferring module 5-1 inlet parallel is connected to the first outlet of desalination water manifold 4, each group flue gas Cooling heat transferring module 5-1 outlet is connected in parallel to the first import of oxygen-eliminating device 8, first outlet and the boiler 10 of oxygen-eliminating device 8 Feed-water inlet is connected, and each group flue gas reheat heat exchange module 9-1 inlet parallel is connected to the second outlet of oxygen-eliminating device 8, each group cigarette Gas reheating heat exchange module 9-1 outlet is connected in parallel to the second import of desalination water manifold.The outlet of normal temperature sweet-water tank 1 passes through Normal temperature sweet-water tank bypass 3 is connected to the first import of desalination water manifold 4.Desalination water manifold 4 bypasses 6 simultaneously by desalination water manifold It is connected to the first import of oxygen-eliminating device 8.Oxygen-eliminating device 8 is provided with steam auxiliary heating import 7.The bottom of wet desulfuration tower 15 and phase transformation The bottom for condensing heat exchanger 2 is connected by desulfurization melt pit 16.
The method that flue gas is handled using the system, is comprised the following steps：
(1) in each group flue gas waste heat utilization device, heat smoke is using flow as 400000Nkm3/ h is successively through each group cigarette Boiler 10, back-end ductwork 11, air preheater 12, dry collector 13, the first air-introduced machine 14, the flue gas of gas residual heat using device Cooler 5, wet desulfuration tower 15 enter phase transformation and condense the demineralized water heat-shift (every flowed in heat exchanger 2, with heat exchanger tube 23 Demineralized water inlet temperature is 10 DEG C, and every demineralized water inlet flow rate is 130t/h), the demineralized water after heat exchange is warming up to 24 DEG C, heat Flue-gas temperature drops to 45 DEG C, and the condensation phase transformation of saturation wet flue gas makes vapor be condensed on fine particle surface, produces simultaneously Thermophoresis and diffusiophoresis effect, subparticle travel motion, mutual making contact constantly grow up after by the surface collection of heat exchanger tube 23, Under gravity, as the liquid film of flowing through water collector 24 is communicated to desulfurizing tower melt pit 16, kind of dust finally Drop to 5mg/Nm3Below；The flue gas after the cooling of heat exchanger 2 out is condensed under the traction of the second air-introduced machine 25 from phase transformation, is entered Enter in smoke re-heater 9, be heated to more than 80 DEG C after carrying out heat exchange with demineralized water, white cigarette is up to standard from chimney 17 after being eliminated Discharge；The outlet that demineralized water after heating condenses heat exchange module 2-1 through phase transformation enters from the first inlet header of desalination water manifold 4 To desalination water manifold 4, then a part of demineralized water bypasses 6 the first imports through oxygen-eliminating device 8 by desalination water manifold and is directly entered Oxygen-eliminating device 8；A part branches to many gas coolers 5 in parallel as Second cold resource and further heated by heat smoke, makes to remove Brine temp is warming up to 103 DEG C by 24 DEG C, and then the first import through oxygen-eliminating device 8 converges into oxygen-eliminating device 8；High temperature demineralized water one The first outlet of lease making oxygen-eliminating device 8 enters the feed water system of boiler, and a part of second outlet through oxygen-eliminating device 8 branches to many parallel connections Smoke re-heater 9 carry out flue gas reheating, while by open steam auxiliary heating import 7 heat demineralized water and regulation flue gas The desalination water-carrying capacity of reheater 9, makes flue gas be heated to more than 80 DEG C, demineralized water temperature drop is concentrated again to 70 DEG C or so Circulated into desalination water manifold 4.
After testing, not mercurous in the neat stress after three boiler processing to wait heavy metal, dust emission is less than 4.2mg/Nm3, Dust size is below 1.0 μm, and content of sulfur dioxide is in 10mg/Nm3Hereinafter, amount of nitrogen oxides is in 10mg/Nm3Below.
Embodiment 3
A kind of smoke waste heat comprehensive utilization system, including four groups of flue gas waste heat utilization devices, flue gas waste heat utilization device bag Include the boiler 10 being sequentially connected, back-end ductwork 11, air preheater 12, dry collector 13, the first air-introduced machine 14, flue gas cooling Device 5, wet desulfuration tower 15, phase transformation cohesion heat exchanger 2, the second air-introduced machine 25, smoke re-heater 9 and chimney 17, phase transformation cohesion are changed Hot device 2, gas cooler 5, smoke re-heater 9 are respectively arranged with phase transformation cohesion heat exchange module 2-1, and (poly- heat exchange module is by material PTFE heat exchanger tubes are constituted, and PTFE heat exchanger tube specifications areHeat exchanger tube is connected using expanded joint technology, outside bobbin carriage sealing, heat exchange Pipe is staggered in arrangement into U-shaped arrangement), flue gas cooling heat transferring module 5-1 (heat exchange module by material be PTFE heat exchanger tubes constitute, PTFE Heat exchanger tube specification isHeat exchanger tube is connected using welding technique with tube sheet floral disc 22, tube sheet floral disc 22 and external metallization bobbin carriage Sealing, heat exchanger tube is into U-shaped arrangement, in-line arrangement) and flue gas reheat heat exchange module 9-1 (heat exchange module is PTFE heat exchange by material Pipe is constituted, and PTFE heat exchanger tube specifications areHeat exchanger tube is connected using welding technique with tube sheet floral disc 22, tube sheet floral disc 22 with External metallization bobbin carriage is sealed, and heat exchanger tube is into U-shaped arrangement, in-line arrangement), the inlet parallel of each group phase transformation cohesion heat exchange module is connected To the outlet of normal temperature sweet-water tank 1, each group phase transformation cohesion heat exchange module 2-1 outlet is connected in parallel to the of desalination water manifold 4 One import, each group flue gas cooling heat transferring module 5-1 inlet parallel is connected to the first outlet of desalination water manifold 4, each group flue gas Cooling heat transferring module 5-1 outlet is connected in parallel to the first import of oxygen-eliminating device 8, first outlet and the boiler 10 of oxygen-eliminating device 8 Feed-water inlet is connected, and each group flue gas reheat heat exchange module 9-1 inlet parallel is connected to the second outlet of oxygen-eliminating device 8, each group cigarette Gas reheating heat exchange module 9-1 outlet is connected in parallel to the second import of desalination water manifold.The outlet of normal temperature sweet-water tank 1 passes through Normal temperature sweet-water tank bypass 3 is connected to the first import of desalination water manifold 4.Desalination water manifold 4 bypasses 6 simultaneously by desalination water manifold It is connected to the first import of oxygen-eliminating device 8.Oxygen-eliminating device 8 is provided with steam auxiliary heating import 7.The bottom of wet desulfuration tower 15 and phase transformation The bottom for condensing heat exchanger 2 is connected by desulfurization melt pit 16.
The method that flue gas is handled using the system, is comprised the following steps：
(1) in each group flue gas waste heat utilization device, heat smoke is using flow as 500000Nkm3/ h is successively through each group cigarette Boiler 10, back-end ductwork 11, air preheater 12, dry collector 13, the first air-introduced machine 14, the flue gas of gas residual heat using device Cooler 5, wet desulfuration tower 15 enter phase transformation and condense the demineralized water heat-shift (every flowed in heat exchanger 2, with heat exchanger tube 23 Demineralized water inlet temperature is 15 DEG C, and every demineralized water inlet flow rate is 170t/h), the demineralized water after heat exchange is warming up to 26 DEG C, heat Flue-gas temperature drops to 44.5 DEG C, and the condensation phase transformation of saturation wet flue gas makes vapor be condensed on fine particle surface, produces simultaneously Heat is swum and diffusiophoresis effect, and subparticle travel motion, mutual making contact is received after constantly growing up by the surface of heat exchanger tube 23 Collection, under gravity, with the liquid film of flowing, through water collector 24 to be communicated to dust in desulfurizing tower melt pit 16, flue gas dense finally Degree drops to 5mg/Nm3Below；The flue gas after the cooling of heat exchanger 2 out is condensed under the traction of the second air-introduced machine 25 from phase transformation, Into in smoke re-heater 9, more than 80 DEG C are heated to after carrying out heat exchange with demineralized water, white cigarette reaches after being eliminated from chimney 17 Mark discharge；The outlet that demineralized water after heating condenses heat exchange module 2-1 through phase transformation is entered from the first inlet header of desalination water manifold 4 Enter to desalination water manifold 4, then a part of demineralized water bypasses 6 the first imports through oxygen-eliminating device 8 by desalination water manifold and directly entered Enter oxygen-eliminating device 8；A part branches to many gas coolers 5 in parallel as Second cold resource and further heated by heat smoke, makes Desalination coolant-temperature gage is warming up to 100 DEG C by 26 DEG C, and then the first import through oxygen-eliminating device 8 converges into oxygen-eliminating device 8；High temperature demineralized water one First outlet of the part through oxygen-eliminating device 8 enters the feed water system of boiler, and a part of second outlet through oxygen-eliminating device 8 branches to many simultaneously The smoke re-heater 9 of connection carries out flue gas reheating, while heating demineralized water and regulation cigarette by opening steam auxiliary heating import 7 The desalination water-carrying capacity of gas reheater 9, makes flue gas be heated to more than 80 DEG C, demineralized water temperature drop collects again to 70 DEG C or so Middle entrance desalination water manifold 4 is circulated.
After testing, not mercurous in the neat stress after four boiler processing to wait heavy metal, dust emission is less than 3.6mg/Nm3, Dust size is below 1.0 μm, and content of sulfur dioxide is in 10mg/Nm3Hereinafter, amount of nitrogen oxides is in 10mg/Nm3Below.

Claims (10)

1. a kind of smoke waste heat comprehensive utilization system, including at least two groups flue gas waste heat utilization devices, described fume afterheat profit Boiler, back-end ductwork, air preheater, dry collector, the first air-introduced machine, the flue gas for including being sequentially connected with device are cooled down Device, wet desulfuration tower, phase transformation cohesion heat exchanger, the second air-introduced machine, smoke re-heater and chimney, described phase transformation cohesion heat exchange Device, gas cooler, smoke re-heater are respectively arranged with phase transformation cohesion heat exchange module, flue gas cooling heat transferring module and flue gas reheat Heat exchange module, it is characterised in that the inlet parallel of the phase transformation cohesion heat exchange module described in each group is connected to normal temperature sweet-water tank Outlet, the outlet of the phase transformation cohesion heat exchange module described in each group is connected in parallel to the first import of desalination water manifold, described in each group The inlet parallel of flue gas cooling heat transferring module be connected to the first outlet of described desalination water manifold, the flue gas described in each group is cold But the outlet of heat exchange module is connected in parallel to the first import of oxygen-eliminating device, the first outlet and described boiler of described oxygen-eliminating device Feed-water inlet connection, what the inlet parallel of the flue gas reheat heat exchange module described in each group was connected to described oxygen-eliminating device second goes out Mouthful, the outlet of the flue gas reheat heat exchange module described in each group is connected in parallel to the second import of described desalination water manifold.
2. smoke waste heat comprehensive utilization system according to claim 1, it is characterised in that described normal temperature sweet-water tank Outlet bypasses the first import for being connected to described desalination water manifold by normal temperature sweet-water tank.
3. smoke waste heat comprehensive utilization system according to claim 1, it is characterised in that the bottom of described wet desulfuration tower Portion is connected with the bottom of described phase transformation cohesion heat exchanger by desulfurization melt pit.
4. smoke waste heat comprehensive utilization system according to claim 1, it is characterised in that described phase transformation cohesion heat exchange Device, gas cooler, the heat exchanger tube material of smoke re-heater are PTFE.
5. smoke waste heat comprehensive utilization system according to claim 1, it is characterised in that described phase transformation cohesion heat exchanger Heat exchanger tube into U-shaped arrangement, be staggered in arrangement；The heat exchanger tube into U-shaped arrangement, in-line of described gas cooler and smoke re-heater Arrangement.
6. the method that the smoke waste heat comprehensive utilization system described in usage right requirement 1 handles flue gas, by flue gas successively through each group Boiler, back-end ductwork, air preheater, dry collector, the first air-introduced machine, gas cooler, the wet desulfuration tower of device enter Enter demineralized water after phase transformation cohesion heat exchanger, with demineralized water heat-shift and be heated temperature rise, flue-gas temperature declines, the wet cigarette of saturation The condensation phase transformation of gas makes vapor be condensed on fine particle surface, while producing thermophoresis and diffusiophoresis effect, subparticle is moved Shifting movement, mutual making contact constantly grow up after by heat exchanger tube surface collection, under gravity, with the liquid of flowing finally Film is communicated to desulfurizing tower melt pit through water collector, and kind of dust drops to 5mg/Nm3Hereinafter, heat exchanger is condensed from phase transformation The flue gas after cooling out is under the second air inducing machine travel, into smoke re-heater, and quilt after heat exchange is carried out with demineralized water Be heated to more than 80 DEG C, white cigarette be eliminated after from chimney qualified discharge, it is characterised in that the demineralized water after heat exchange is through many parallel connections Phase transformation cohesion heat exchange module outlet entered from the first inlet header of desalination water manifold after desalination water manifold, a part point Many gas coolers in parallel are flow to as Second cold resource further to be heated by flue gas, demineralized water is warming up to more than 100 DEG C, Then the first import through oxygen-eliminating device converges into oxygen-eliminating device；A high temperature demineralized water part first going out through oxygen-eliminating device in oxygen-eliminating device Mouth enters the feed water system of boiler, and a part of second outlet through oxygen-eliminating device branches to many smoke re-heaters in parallel and carries out flue gas Circulated after reheating into demineralized water header.
7. the method for processing flue gas according to claim 6, it is characterised in that desalination is set in described desalination water manifold Water manifold is bypassed, and described desalination water manifold is connected to the first of described oxygen-eliminating device by described desalination water manifold bypass and entered Mouthful, demineralized water after heat exchange condenses the outlet of heat exchange module from the first inlet header of desalination water manifold through many phase transformations in parallel In enter after desalination water manifold, a part of demineralized water is passed through described desalination water manifold and bypass the first import through oxygen-eliminating device It is directly entered oxygen-eliminating device.
8. the method for processing flue gas according to claim 6, it is characterised in that set steam to aid in described oxygen-eliminating device Import is heated, if flue-gas temperature is not up to more than 80 DEG C when carrying out flue gas reheating in smoke re-heater, institute is opened The steam auxiliary heating import heating demineralized water stated, then distributes desalination water-carrying capacity, heating cooling dedusting according to each unit operating mode Flue gas after dehumidification.
9. the method for processing flue gas according to claim 6, it is characterised in that the demineralized water initial temperature is 10~20 DEG C, flow is 100~200t/h.
10. it is according to claim 6 processing flue gas method, it is characterised in that the flow of the flue gas be 100000~ 600000Nkm3/h。
CN201710408703.1A 2017-06-02 2017-06-02 A kind of smoke waste heat comprehensive utilization system and its method Pending CN107218618A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108332228A (en) * 2018-02-10 2018-07-27 山东省环能设计院股份有限公司 A kind of fume treatment utilizes equipment
CN110848721A (en) * 2019-11-25 2020-02-28 衢州佰强新材料科技有限公司 Fluorine plastic steel low temperature flue gas advanced treatment device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108332228A (en) * 2018-02-10 2018-07-27 山东省环能设计院股份有限公司 A kind of fume treatment utilizes equipment
CN110848721A (en) * 2019-11-25 2020-02-28 衢州佰强新材料科技有限公司 Fluorine plastic steel low temperature flue gas advanced treatment device
CN110848721B (en) * 2019-11-25 2021-05-25 衢州佰强新材料科技有限公司 Fluorine plastic steel low temperature flue gas advanced treatment device

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