CN107101216A - One kind, which is returned, takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type and its method of work - Google Patents

One kind, which is returned, takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type and its method of work Download PDF

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Publication number
CN107101216A
CN107101216A CN201710261825.2A CN201710261825A CN107101216A CN 107101216 A CN107101216 A CN 107101216A CN 201710261825 A CN201710261825 A CN 201710261825A CN 107101216 A CN107101216 A CN 107101216A
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China
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flue gas
point storehouse
former
neat stress
heat
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CN201710261825.2A
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CN107101216B (en
Inventor
梁秀进
郝功涛
朱跃
孙海峰
魏宏鸽
朱文韬
江建平
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Abstract

Returned the present invention relates to one kind and take out the former neat stress back-heating type heat-exchange system of Anti-leakage type, including desulfurizing tower, a flue, No. three flues and chimney, the outlet of desulfurizing tower is connected with the entrance of No. three flues, it is characterised in that：Also include No. two flues, No. four flues and recuperative heat exchanger, recuperative heat exchanger includes heat accumulating element, carry and substitute a point storehouse, former flue gas point storehouse and neat stress point storehouse, heat accumulating element is connected with drive mechanism, former flue gas point storehouse, carry replacement point storehouse and neat stress point storehouse is set gradually along the traffic direction of heat accumulating element, the outlet of a number flue is connected with the entrance in former flue gas point storehouse, the outlet in former flue gas point storehouse is connected with the entrance of No. two flues, the outlet of No. two flues is connected with the entrance of desulfurizing tower, the outlet of No. three flues is connected with the entrance in neat stress point storehouse, the outlet in neat stress point storehouse is connected with the entrance of No. four flues, the outlet of No. four flues is connected with chimney.The method of work for taking out the former neat stress back-heating type heat-exchange system of Anti-leakage type is returned the invention further relates to this.

Description

One kind, which is returned, takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type and its method of work
Technical field
Returned the present invention relates to one kind and take out the former neat stress back-heating type heat-exchange system of Anti-leakage type and its method of work.
Background technology
Increasingly stricter with environmental protection policy, the flue gas desulfurization techniques of China's overwhelming majority coal-burning boilers all employs wet Method desulphurization system.The inlet flue gas of wet desulfurization system is general at 120-130 DEG C, and the temperature of exiting flue gas is with its inlet flue gas temperature Degree is different, and typically at 50 DEG C or so, then flue gas saturated vapor is pressed in 12.5 ╳ 103Pa or so.Water in flue gas mostlys come from Coal combustion produce moisture and in desulfurizing tower smoke evaporative sulfur removal technology water, coal combustion produce flue gas in moisture it is general In 3-8%, remaining is the sulfur removal technology water of smoke evaporative.According to above-mentioned data estimation, for the coal burning machine of a 300MW grade Group, when at full capacity, entrained water is in 150t/h or so in discharge flue gas, if to run every year in terms of 4000h comes, it is carried Water just have 600000t, it is considerable.Neat stress after wet desulfurization system is handled is vapo(u)rous flue gas, directly With smoke stack emission, there is flue gas and extricate oneself that ability is low, diffusance is small, institute is aqueous also to condense precipitations, generation " white cigarette " after cooling Phenomenon.With the development of society, the raising of living standards of the people, environmentally friendly requirement also more and more higher.Particularly near cities Power plant, progressively requires fume emission without " white cigarette " phenomenon, and the area such as Beijing, Shanghai, Zhejiang, Jiangsu has required thermal power plant to de- Neat stress carries out heat temperature raising after sulphur, realizes discharge flue gas without " white cigarette " phenomenon.In water-deficient area, if the water in recovered flue gas It is used, will also has very high environmental benefit, Social benefit and economic benefit.
Utilize the coal-burning boiler swinging GGH of recuperative heat exchanger（gas-gas heater）, because its heat exchange efficiency is high, The advantages of volume ratio pipe heat exchanger is compact, early stage was once widely applied in Large-sized Coal-fired Power group, former before desulfurization for reclaiming Neat stress after flue gas heat heating desulfurization, is realized：
（1）Exhaust gas temperature is reached on dew point, mitigate the corrosion to flue and chimney, improve the diffusance of flue gas；
（2）It is lowered into the flue-gas temperature on absorption tower, reduction tower to corrosion-resistant process specifications；
（3）Desulfuration absorbing tower inlet flue gas temperature is reduced, is reduced due to the sulfur removal technology water evaporation that flue-gas temperature height is caused, and then Reduce the rate of water make-up of process water in absorption tower；
（4）Alleviate wet desulphurization after funnel and emit " white cigarette " phenomenon.
From principle, swinging GGH design is very reasonable, but there is also following distinct issues：
（1）GGH former fume side can reduce the desulfuration efficiency of system, swinging GGH former fume side to the leakage of neat stress side Leakage rate between neat stress side is general below 1.0%；
（2）80 DEG C be reduced in GGH by 130 DEG C or so below acid dew point due to former flue gas, therefore can be produced in GGH hot side Raw substantial amounts of sticky concentrated acid liquid.These acid solutions not only have very strong corrosiveness, Er Qiehui to GGH heat exchange element and housing Adhere to the flying dust in a large amount of flue gases.In addition, after being evaporated through the small slurry droplet of demister on the surface of heat exchange element, Also the foulant of solid can be formed.
The problem of being blocked due to heat accumulating element very protrude so that most of thermal power plant before minimum discharge policy execution, Just progressively with chimney anticorrosion, wet flue gas is in line instead of swinging GGH.Then there is following harm in the direct discharge of wet flue gas：
（1）Flue-gas temperature is less than acid dew point, has acid drop and condenses out from flue gas, has not only polluted environment but also etching apparatus；
（2）The temperature of wet flue gas is than relatively low, and rising height is smaller, and ground pollution concentration can be caused of a relatively high；
（3）Wet flue gas contains a large amount of vapor, in saturation state, and the flue gas of discharge can make the plume be in because of the condensation of vapor White, influences vision.
For harm（1）, most of power plant all solved by chimney anticorrosion, i.e., chimney anticorrosion is typically wet flue gas row The prerequisite put, still, harm（2）、（3）It is that wet flue gas directly discharges open question.Realize flue gas without " white Cigarette " is discharged, it is common practice to carry out heat temperature raising to flue gas, its exhaust temperature is higher than vapo(u)rous temperature.At present, to wet Method desulphurization system discharge vapo(u)rous flue gas carry out heating disappear " white cigarette " thermal source have former off-gas recovery heat, steam turbine it is low plus The low-quality steam of system and air preheater outlet Secondary Air, using the low-quality steam of the low adding system of steam turbine and air preheater Although outlet Secondary Air can solve the problem, it can substantially increase the net coal consumption rate of unit, so, using former off-gas recovery heat Measure as the overall situation of thermal source, more adaptation energy-saving and emission-reduction.
Because there is problem, the GGH of MIT's research and development MGGH in swinging GGH（Full name Mitsubishi Gas- Gas Heater）It is successfully applied in the technology engineering that flue gas heats up after wet desulfurization system, realizes and adopt With the former off-gas recovery heat system outlet neat stress of wet desulfurization system entrance, the mesh of neat stress high temperature discharge is realized 's.The technology is in electric cleaner wet fuel gas desulfurizing technology（Single dedusting, sulfur removal technology）On the basis of, using No leakage tubular type The wet method limestone-gypsum method flue gas desulfurization technique of heating agent body heater, in the process system, after former flue gas water, with adding The neat stress after water heating desulfurization after heat.When boiler combustion low-sulfur coal, the technique has No leakage, without temperature and dry and wet The conversion repeatedly of flue gas, the advantages of being not easily blocked.Initial stage, MGGH heat regenerator is arranged in after electric precipitation, works as burning high sulfur coal When, SO3Caused etching problem shows, and this problem is more protruded under Chinese ature of coal integrally poor, market coal environment.For The continuous improvement that environment protection emission controls standard is adapted to, while solving SO3Caused acid corrosion problem, by research, by MGGH heat The arrangement that recover is moved to after air preheater before electric precipitation is applied successfully and popularized in an all-round way, and the program is also provided with low The effect of low temperature electric precipitation, improves efficiency of dust collection.Although the technology solves former swinging GGH blocking, leakage well The problems such as, when coal-fired sulfur is less than 1.2, flue gas heater material is accomplished by using the stainless steel that antiseptic property is good, price is high Material or fluoroplastics material, but when coal-fired sulfur is more than 1.2, gas cooler and flue gas heater material are required for using not Steel matter of becoming rusty or fluoroplastics material.Be additionally, since pipe heat exchanger for indirect contact heat exchanger, and thermal medium in the middle of needing Matter so that system heat transfer temperature difference is small, heat transfer effect is poor.So, MGGH technologies in actual applications generally existing system complex, Heat exchanger volume is big, cost is high（More than tens million of）The problem of.
In recent years, because power plants all realize minimum discharge substantially（NOx、SO2Distinguish with the concentration of emission of dust Less than 50mg/Nm3、35mg/Nm3、5mg/Nm3）, the either dust content of former flue gas（Typically smaller than 20mg/Nm3）, or only The dust of flue gas（Typically smaller than 5mg/Nm3）With droplet content, the condition before all implementing than minimum discharge（Former exhaust gas dust concentration 80mg/Nm3More than, neat stress dust concentration≤30mg/Nm3）There is great improvement.Moreover, with the hair of ceramic heat-storing element Exhibition so that the corrosion resistance of recuperative heat exchanger heat accumulating element and easy washability are obtained for great raising, widely should For air preheater with prevent SCR denitration put into operation after hydrogen sulfate ammonia block, operational effect is good.Realized in fume emission super Under conditions of low emission, asking for recuperative heat exchanger blocking can be solved using the recuperative heat exchanger of ceramic heat-storing element completely Topic.
After blockage problem solution, if directly carrying out the heat exchange of former flue gas and neat stress using recuperative heat exchanger, also Need to solve former flue gas to neat stress reveal the problem of.The former flue gas of desulfurization process is not carried out to the leakage of neat stress, it will reduction The desulfuration efficiency of desulphurization system, or even influence the realization of flue gas minimum discharge.Leakage between the flue gas of recuperative heat exchanger, is pressed Its producing cause can be divided into carrying leakage and directly leakage.Carry leakage to refer to operationally, the gas in the heat exchange element of lattice storehouse Body is carried the leakage caused to opposite side by rotation, and amount of leakage is calculated by equation below：
△Vxd=（n/60）╳（π/4）╳（D2-d2）╳H╳（1-γ）
In formula：△Vxd- carry inleakage, m3/s；
The rotating speed of n- rotors, r/min；
The diameter of D- rotors, m；
The height of H- rotors, m；
The diameter of d- central tubes；
γ-heat accumulating element and dust stratification account for the volume share of rotor.
Understand that carry inleakage is directly proportional to rotor speed, rotor speed is faster, carries inleakage bigger；Lattice is changed in storehouse Thermal element and rotor volumes share shared by dust stratification are smaller, and size of heat exchanger is bigger, carry and reveal bigger, the part amount of leakage is relative Total exhaust gas volumn is very little.When recuperative heat exchanger is run, former neat stress mutually has carrying to reveal, and neat stress is to former flue gas Leakage is only increased the exhaust gas volumn of desulphurization system entrance, endangers small；Former flue gas can then cause neat stress to the leakage of neat stress SO2Concentration and dust concentration rise, harm are big.It is between recuperative heat exchanger Central Plains flue gas and neat stress directly to leak out Seal clearance between pressure difference, and diaphragm seal and fanning strip, arc is caused.Directly leakage is the high gas of pressure to pressure Low gas leakage, i.e., former flue gas is leaked to neat stress, and harm is big.Adopt and solve above two leakage with the following method：
（1）Carry and substitute a point storehouse（Eliminate and carry leakage）
Set to carry before former flue gas point storehouse enters neat stress point storehouse and substitute a point storehouse, entrance is the replacement wind of external surrounding air Pipe, is exported to return exhaust column, and its size is substituted according to the heat accumulating element for carrying former flue gas before neat stress point storehouse is entered by air Complete to be defined, pressure and heat exchanger rotating speed of exhaust column etc. are returned by reasonable adjusting replacement airduct control valve, outlet can be real It is existing.
（2）Border is evacuated groove（Eliminate and directly reveal）
Set between former flue gas point storehouse and neat stress point storehouse and be evacuated groove, the former flue gas point storehouse of pumping groove connection,（It is wet/dry）Neat stress Point storehouse and return exhaust column.Be less than former flue gas and neat stress static pressure by making to return the static pressure of exhaust column, it is ensured that a small amount of former flue gas and The flow direction of neat stress unidirectionally returns exhaust column, so that it may realize that former flue gas is not revealed to neat stress.
（3）Return air exhauster（Forming low-pressure side, there is provided power）
Either carrying substitutes a point storehouse outlet, still returns exhaust column, is required for and substitutes formation between airduct and former flue gas point storehouse Certain pressure difference realizes carrying leakage and the former cigarette directly revealed of the former flue gas to neat stress as the power of flue gas one-way flow Gas, which is returned, draws back former flue gas, to prevent neat stress pollutant emission exceeded.So, it need to set and return air exhauster, the connection of its entrance is taken Band substitutes airduct and border pumping groove, the former flue gases duct of outlet connection.
For flue gas Water Sproading, main flume water lift technology path has three kinds in the world at present：Embrane method water lift, spraying cooling Water lift technology and condensing heat-exchange water lift：
（1）Embrane method water lift technology
Stream molecule is filtered by membrane technology, osmotic pressure comes from the vacuum of air cooling tubes condenser, moisture recovery system Mainly it is made up of membrane filtering device and air cooling tubes condenser, the water of trapping can reuse by simple process.Embrane method water lift skill No matter abroad or at home art is limited by film industry, and investment operating cost is very high, all in conceptual phase, is also not suitable for Industrial applications.
（2）Spraying cooling water lift technology
Water condensation tower and enclosed aerating and cooling tower are received by building a set of flue gas spraying cooling after desulfurizing tower, spraying cooling receives water cooling It is solidifying to be connected between tower and enclosed aerating and cooling tower by a water-water heat exchanger.In spray column, the water that is received from flue gas with Shower water is mixed, and by the water at low temperature cooled flue gas after the spraying cooling into flue gas, the flue gas after cooling separates out satiety Flue gas condensed is obtained with water vapour to bear water；While shower water cooled flue gas is by flue gas cool-down, itself is heated up；After heating Shower water is connected carry out heat exchange by water water- to-water heat exchanger with enclosed aerating and cooling tower heat medium water, reaches that heat discharges itself quilt The purpose of cooling；Enclosed aerating and cooling tower heat medium water returns to aerating and cooling tower and air after water-water heat exchanger is heated up Heat exchange cooling is carried out, i.e., is lost using the gas-liquid dividing wall type heat exchanger heat that recirculated water is absorbed from water lift tower that exchanged heat, The final purpose for realizing flue gas and air heat-exchange cooling Water Sproading indirectly.
（3）Indirect contact flue gas cool-down water lift technology
Mainly the neat stress after desulfurization is cooled by way of indirect contact exchanges heat, due to flue gas different temperatures Saturated humidity is different, and its saturated humidity can reduce after flue-gas temperature reduction, and its supersaturated part moisture will condense precipitation, and then It is collected utilization.Except the recovery of water, during water recovery is separated out, condensed by phase transformation and collide coalescence, can be big Width improves the removal efficiency of ultrafine dust and aerosol；The moisture being additionally, since in flue gas is reduced, SO3Partial pressure will raise, Dew point is raised, and condensation condensate condenses by nucleus of sulfuric acid droplet, promotes sulfuric acid droplet to grow up, it is easy to which the trapping of sulfuric acid droplet takes off Remove.Indirect contact heat exchanger has finned tube exchanger, heat exchange of heat pipe and plate type heat exchanger, because flue gas after desulfurization contains one Quantitative sour gas and aerosol, the material of heat exchanger is generally required using corrosion resistant stainless steel or fluoroplastics material Matter.Indirect contact heat exchanger is poor due to its heat transfer effect, and material needs expensive anti-corrosion material（Stainless steel, fluorine modeling Material）, and the problem of be also easy to produce that heat exchanger volume is big, involve great expense.The low-temperature receiver of cooled flue gas can use surrounding air And river, but having the usual not water shortage in the available area of river, the necessity of recycle-water is with regard to little, open type water cooling mode It is also easy to cause the thermal pollution of river.If being low-temperature receiver using surrounding air, air-flue gas direct heat transfer and sky can be used Air-water-flue gas indirect heat exchange two ways：The mode of air/smoke direct heat transfer, is imitated because indirect contact heat exchanger exchanges heat Really poor the characteristics of, it is easy to produce that heat exchanger volume is huge, high cost problem；Air-Water-flue gas indirect heat exchange then needs to set up A set of enclosed aerating and cooling tower and water water- to-water heat exchanger, form closed cycle, finally realize flue gas and air heat-exchange cooling Water Sproading Purpose, system is complex.
Received from above-mentioned three kinds in terms of water technology, embrane method surgical technic does not possess the bar of market application also temporarily due to price problem Part；When spraying cooling intake technology and indirect contact flue gas cool-down intake technology are using air as low-temperature receiver, all need to set enclosed to lead to Cooling Tower and water water heat-exchanger rig, system are more complicated；Indirect contact flue gas cool-down intake technology uses river for low-temperature receiver When, it is meant that there are rivers this area, exist water saving necessity it is little the problem of.
Chinese patent 201210572794.X discloses a kind of smoke heat exchanging system and fired power generating unit.Wherein, flue gas heat exchange System is provided with flue gas heat-exchange unit, and the entrance of flue gas heat-exchange unit is connected via reducer pipe and upstream flue with air preheater.Flue gas Heat exchanger exit is directly connected by horn mouth with deduster entrance, and between flue gas heat-exchange unit outlet and deduster entrance no longer Provided with another reducer pipe and flue.Program high energy consumption, it is difficult to reach discharge standard.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and a kind of reasonable in design is provided, The former neat stress back-heating type heat-exchange system of Anti-leakage type is taken out in lower, more environmentally friendly the returning of energy consumption.Present invention also offers return to take out Anti-leakage type Former neat stress back-heating type heat-exchange system and its method of work.For realize the former flue gas of fire coal boiler fume wet desulfurization system not to Exchanged heat under neat stress leak condition, reach that chimney emission is discharged without " white cigarette ", and recovery section neat stress contained humidity Purpose.
The present invention the used technical scheme that solves the above problems is：One kind, which is returned, takes out the former neat stress back-heating type heat exchange of Anti-leakage type System, including desulfurizing tower, a flue, No. three flues and chimney, the outlet of desulfurizing tower are connected with the entrance of No. three flues, and it is special Levy and be：Also include No. two flues, No. four flues and recuperative heat exchanger, recuperative heat exchanger includes heat accumulating element, carries and replace Dai Fencang, former flue gas point storehouse and neat stress point storehouse, heat accumulating element are connected with drive mechanism, and former flue gas point storehouse, carrying substitute a point storehouse Set gradually with neat stress point storehouse along the traffic direction of heat accumulating element, the entrance of the outlet of a flue and former flue gas point storehouse connects Logical, the outlet in former flue gas point storehouse is connected with the entrance of No. two flues, and the outlet of No. two flues is connected with the entrance of desulfurizing tower, No. three The outlet of flue is connected with the entrance in neat stress point storehouse, and the outlet in neat stress point storehouse is connected with the entrance of No. four flues, No. four cigarettes The outlet in road is connected with chimney.
The junction in former flue gas point storehouse of the present invention and neat stress point storehouse is provided with border pumping groove, former flue gas point storehouse and The junction for carrying replacement point storehouse is provided with border pumping groove, carries the outlet for substituting point storehouse and border pumping groove is respectively connected with and returned Exhaust column, returns to be connected with outside exhaust column and returns air exhauster, returns air exhauster and is connected with a flue, flushing is provided with by recuperative heat exchanger Device.Return between air exhauster and a flue and to be connected by No. five flues.No. five flues are to return air exhauster to a flue air pipe. Various flues including a flue, No. two flues, No. three flues, No. four flues and No. five flues are closed according to site space Removing the work is put, it is ensured that can pass through enough exhaust gas volumn and air capacity under rational resistance.Former flue gas point storehouse and neat stress point storehouse （Wet/dry flue gas point storehouse）Between set border pumping groove, border pumping groove connection former flue gas, wet/clean flue gas and return exhaust column, if Put and return air exhauster, it is ensured that return exhaust column static pressure minimum.Return former flue gas, wet neat stress, clean flue gas and the replacement of air exhauster extraction The gaseous mixture of air is returned to a flue, and desulfurization process is carried out with former flue gas to desulphurization system.
Recuperative heat exchanger of the present invention also includes cooling wind separating bin, and neat stress point storehouse includes dry flue gas point storehouse and wet cigarette Qi leel storehouse, is provided with connection flue, leads between dry flue gas point storehouse and wet flue gas point storehouse between dry flue gas point storehouse and wet flue gas point storehouse The connection of connection flue is crossed, former flue gas point storehouse, carrying, which are substituted, divides a storehouse, dry flue gas point storehouse, cooling wind separating bin and wet flue gas to divide storehouse along storage Thermal element traffic direction is set gradually, the entrance in wet flue gas point storehouse and the outlet of No. three flues, the outlet in dry flue gas point storehouse Connected with the entrance of No. four flues, cooling wind separating bin is connected with cooling blower.When there is flue gas water intaking necessity, flue gas is entered Water-filling is reclaimed, first, and it is low-temperature receiver to answer prioritizing selection surrounding air, secondly, also needs to consider to simplify system, raising system heat exchange effect Really.Therefore, on the basis of solving leakage problem, realizing the back-heating type heat-exchange system of original/neat stress heat exchange, in vapo(u)rous Wet flue gas point storehouse before cooling wind separating bin is set, use air for low-temperature receiver, enter to heat accumulating element will be carried out into wet flue gas point storehouse Row cooling, makes heat accumulating element be less than the temperature of wet neat stress, into wet flue gas point storehouse after just can cool down wet neat stress and separate out it Part supersaturation water.After the supersaturation water of precipitation is collected by water collector, it can be used as a kind of water resource, and satiety Successive precipitation with water can also realize heat accumulating element on-line rinsing, prevent the deposition of fine particle.From wet flue gas point The heat accumulating element that storehouse comes out is subsequently entered former flue gas point storehouse and is further heated by wet neat stress heat temperature raising；It is cooled to receive water Wet neat stress afterwards becomes clean flue gas, subsequently into the dry flue gas point storehouse set up behind former flue gas point storehouse.Heat accumulating element is in former cigarette Qi leel storehouse is by the further heat temperature raising of the former flue gas of high temperature, and the heat of the former flue gas release absorbed subsequently enters dry flue gas point storehouse and released Put to clean flue gas.High temperature original flue gas enters wet desulfurization system after the cooled cooling in former flue gas point storehouse and carries out desulfurization process, Discharged after totally flue gas is heated up in dry flue gas point storehouse to chimney without " white cigarette ".The storage being cooled in dry flue gas point storehouse Thermal element subsequently enters cooling wind separating bin and is further cooled to below wet neat stress temperature by surrounding air, enters back into wet flue gas point Storehouse cools receipts water to wet neat stress.With the rotation for returning heat accumulating element, the process is constantly circulated, and is reached and is utilized from former flue gas The heat neat stress of middle recovery is to nothing " white cigarette " exhaust temperature, and recovery section desulphurization system exports neat stress partial coagulation The purpose of water.Because its vapo(u)rous temperature is low, the cooled clean flue gas received after water needs heating to reach without " white cigarette " discharge Required temperature, it is lower than temperature needed for former wet neat stress, so, the heat exchange area in former flue gas point storehouse and dry flue gas point storehouse is equal Diminish, so as to reduce construction costs and SR.In the present invention, flue be former flue gas to recuperative heat exchanger flue, No. two flues are original flue gas after cooling to desulphurization system flue, and No. three flues are wet neat stress to recuperative heat exchanger flue, four Number flue is clean flue gas after heating to chimney air flue.Interface channel is clean flue gas after cooling receipts water to recuperative heater cigarette Road.Such as without Water Sproading demand, system can merge wet flue gas point storehouse and dry flue gas point storehouse, and cooling wind separating bin, water collector are cancelled, Flusher is set up, is reduced to return and takes out Anti-leakage type original/neat stress back-heating type heat-exchange system, directly utilize the former flue gas heat reclaimed Neat stress is heated to flue gas without " white cigarette " exhaust temperature.
The junction in former flue gas point storehouse of the present invention and wet flue gas point storehouse is provided with border pumping groove, former flue gas point storehouse and The junction for carrying replacement point storehouse is provided with border pumping groove, and the entrance for carrying replacement point storehouse is connected with replacement airduct.Carrying is replaced For replacement airduct is set on point storehouse, for the former flue gas carried in heat accumulating element to be blown out, substituted by surrounding air.Back-heating type exchanges heat Device includes the heat accumulating element for the enamel that corrosion-resistant easy is rinsed, and it is divided into according to function：Former flue gas point storehouse, carry substitute a point storehouse, Dry flue gas point storehouse, cooling wind separating bin and wet flue gas point storehouse.Wherein cooling wind separating bin, wet flue gas Fen Cang, former flue gas point storehouse, carrying are replaced Set gradually for point storehouse and dry flue gas point storehouse along heat accumulating element traffic direction.Former flue gas is walked in former flue gas point storehouse, is carried and is substituted a point storehouse For the former flue gas for entering neat stress side from former fume side to be substituted by Air blowing, dry flue gas point storehouse is walked in wet flue gas point storehouse The cooled clean flue gas received after water, cooling wind separating bin is used to walk the surrounding air of cooling heat accumulating element, wet flue gas point storehouse walk from The wet neat stress with saturated vapor pressure that wet desulfurization system exports out, each point of storehouse size is according to heat exchange property requirement point Cut.Wet desulfurization system outlet is the outlet of desulfurizing tower.Wet flue gas point storehouse is connected by No. three flues with the outlet of desulfurizing tower It is logical.For coal-fired flue-gas wet desulfurization system, recuperative heat exchanger is utilized（Heat accumulating type, ceramic heat-storing element）, it is empty using environment Gas is low-temperature receiver, and heat accumulating element is cooled down in cooling wind separating bin；Cooled heat accumulating element enters wet flue gas point storehouse, to wet desulphurization System outlet vapo(u)rous flue gas is cooled down, and the flue gas after cooling will separate out its supersaturated part water, and flue gas is with laggard Enter dry flue gas point storehouse, the condensate of precipitation is then collected by water collector；Entered again by the heat accumulating element after wet neat stress heat temperature raising Enter former flue gas point storehouse, by the further heat temperature raising of the former flue gas of high temperature, the former flue gas after being cooled subsequently enters desulphurization system progress Desulfurization process；Heat accumulating element after heating enters dry flue gas point storehouse after being come out from former flue gas, and the clean flue gas after water is received to cooling Heat temperature raising is carried out, the clean flue gas after being warmed to chimney is discharged without " white cigarette "；Heat accumulating element after being cooled down by clean flue gas Subsequently enter the cooled wind of cooling wind cabin further to cool down, then enter back into wet flue gas point storehouse；, should with the rotation of heat accumulating element Process constantly circulates progress, reaches that wet desulfurization system outlet neat stress receives water by surrounding air cooling, then by the former flue gas of entrance It is heated to without " white cigarette " exhaust temperature.In the area without Water Sproading demand, directly entered with coal-burning boiler wet desulfurization system The heat of the former off-gas recovery of mouth high temperature is thermal source, heats desulphurization system low exit temperature saturation neat stress, realizes wet desulfurization system Neat stress is exported to discharge without " white cigarette ".
It is provided with below wet flue gas point storehouse of the present invention in captation, No. four flues and is provided with fog-proof device.Catchment Device, which is collected in wet neat stress, condenses the supersaturated vapor condensate got off.Received in captation also known as water collector, the present invention Water installations can be using receipts tank with receiving puddle.
It is a kind of to return the method for work for taking out the former neat stress back-heating type heat-exchange system of Anti-leakage type, comprise the following steps：Former flue gas leads to Cross a flue and enter desulfurizing tower, former flue gas turns into neat stress after the desulfurization process of desulfurizing tower, and neat stress passes through No. three cigarettes Road flows to chimney, it is characterised in that：Comprise the following steps that：
1）Former flue gas first passes around former flue gas point storehouse, then enters back into desulfurizing tower and carries out desulfurization process；In this step, heat accumulating element In former flue gas point storehouse, former flue gas makes heat accumulating element heat up, while former flue gas is cooled in neat stress point storehouse；
2）Step 1）In, the former flue gas after cooling is entered by No. two flues to be carried out after desulfurization process, desulfurization process in desulfurizing tower Former flue gas turn into neat stress, neat stress initially enters neat stress point storehouse by No. three flues and heated up, then neat stress from Open neat stress point storehouse and go to chimney by No. four flues；In this step, heat accumulating element rotates by drive mechanism effect, stores Thermal element enters neat stress point storehouse by former flue gas point storehouse, and temperature is raised under heat accumulating element effect of the neat stress after heating.
The outlet of the entrance and cooling wind separating bin of present invention cooling wind separating bin is connected with surrounding air, and wet flue gas point storehouse is connected with Wet neat stress, former flue gas point storehouse is connected with former flue gas, and dry flue gas point storehouse is connected with clean flue gas, and the entrance for carrying replacement point storehouse is connected with ring Border air；
Former flue gas is to heat accumulating element release heat cooling in former flue gas point storehouse, and the former flue gas after cooling is entered by No. two flues The former flue gas after desulfurization process, desulfurization process is carried out in desulfurizing tower as wet neat stress, wet neat stress enters via No. three flues Wet flue gas point storehouse, release heat is to heat accumulating element in wet flue gas point storehouse for wet neat stress, while separating out supersaturation water rinses accumulation of heat Element, separating out the wet neat stress after supersaturation water turns into clean flue gas, and clean flue gas is entered by connecting flue by wet flue gas point storehouse Enter dry flue gas point storehouse, clean flue gas absorbs the heat discharged in heat accumulating element in dry flue gas point storehouse, air is discharged into via chimney；
Heat accumulating element is cooled in cooling wind separating bin by surrounding air, until the temperature of heat accumulating element is reduced to the temperature of wet neat stress Below degree, then heat accumulating element enters in wet flue gas point storehouse, and heat is absorbed from wet neat stress and is heated up, then heat accumulating element Into in former flue gas point storehouse, heat accumulating element absorbs heat from former flue gas and further heated up, and then heat accumulating element is turned to again Heat release cools in dry flue gas point storehouse, and last heat accumulating element is turned to again further to be cooled in cooling wind separating bin by surrounding air.
The supersaturation water that the present invention is separated out carries out on-line rinsing to heat accumulating element.
Captation of the present invention collects the supersaturation water separated out after wet neat stress is cooled.
Cooling blower of the present invention provides power and surrounding air is passed through into cooling wind separating bin.
Surrounding air is used for low-temperature receiver, heat accumulating element is cooled down in cooling wind separating bin；The heat accumulating element of cooling enters wet cigarette Qi leel storehouse, is exported to wet desulfurization system（The outlet of desulfurizing tower）Wet neat stress with saturated vapor pressure is cooled down, Heat accumulating element is heated up, and the supersaturation water that the wet neat stress after cooling separates out part collects reuse by water collector；Through wet Heat accumulating element after neat stress heat temperature raising enters back into former flue gas point storehouse, by the further heat temperature raising of the former flue gas of high temperature, is cooled Former flue gas afterwards subsequently enters desulphurization system and carries out desulfurization process；Heat accumulating element divides after being come out from former flue gas point storehouse into dry flue gas Storehouse, the clean flue gas after water is received to cooling and carries out heat temperature raising, while heat accumulating element is cooled, the clean flue gas after heating to cigarette Chimney is discharged without " white cigarette "；It is further cold by surrounding air that heat accumulating element after being cooled down through clean flue gas subsequently enters cooling wind cabin But, the wet neat stress of the saturation of wet flue gas point storehouse cooling desulfurizing tower outlet is then entered back into.It is above-mentioned with the rotation of heat accumulating element Process constantly circulates progress, reaches that the wet neat stress of wet desulfurization system outlet receives water by surrounding air cooling, then by dry flue gas Heat accumulating element in point storehouse is heated to without " white cigarette " exhaust temperature；Meanwhile, the former flue gas of wet desulfurization system entrance is dropped Temperature, reduces the evaporation of sulfur removal technology water.Carrying is set between former flue gas point storehouse and dry flue gas point storehouse and substitutes point storehouse, its entrance is and ring The replacement airduct that border is communicated, is exported to return exhaust column, is revealed for eliminating former flue gas to the carrying of neat stress.Former flue gas point storehouse and Border pumping groove between wet/dry flue gas point storehouse, the former flue gas of connection, neat stress and carrying substitute a point storehouse outlet, by returning exhausting Machine causes border to be evacuated the static pressure that groove static pressure is less than former fume side and neat stress side, for eliminating former flue gas to the direct of neat stress Leakage.The gaseous mixture for returning former flue gas, neat stress and air that air exhauster is extracted returns to former flue gases duct, delivers to desulphurization system and enters Row desulfurization process.
The supersaturated condensed water that the present invention is separated out carries out on-line rinsing to recuperative heat exchanger.
Compared with prior art, the present invention, which is returned, takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type and its method of work was both realized Wet desulfurization system exiting flue gas is discharged without " white cigarette ", has also been reclaimed partial fume and has been carried water, has there is a following advantage：
（1）Under conditions of former flue gas is not revealed to neat stress, the direct of the former flue gas of wet desulfurization system and neat stress is realized Contact exchanges heat；
（2）The wet neat stress contained humidity of recovery section desulfurizing tower outlet vapor saturation, the supersaturation water of precipitation exists to heat accumulating element Line is uninterruptedly rinsed, and prevents the ultrafine dust in former flue gas, the droplet in neat stress and condensable particulate matter etc. from depositing accumulation of heat Element, plays a part of also removing the ultrafine dust and condensable particulate matter in flue gas while preventing heat exchanger from blocking；
（3）Extract in the gas for returning to former flue gases duct in addition to former flue gas, also a small amount of air and neat stress are increased de- The amount of former flue gas before sulphur tower, but by rationally designing, increment value can be controlled within the 5% of total former exhaust gas volumn, and this is that wet method takes off What sulphur system can be born completely.
In a word, the system is compared with former GGH, possesses that its direct contact heat transfer effect is good, heat exchanger volume is compact Advantage, solve again blocking and former flue gas to neat stress reveal the problem of；Compared with MGGH, simple system is realized with direct Contact heat exchange instead of indirect contact heat exchange, reduce heat exchanger volume, reduce construction costs.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the recuperative heat exchanger of the embodiment of the present invention 1.
Fig. 3 is the structural representation of the embodiment of the present invention 2.
Fig. 4 is the structural representation of the recuperative heat exchanger of the embodiment of the present invention 2.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, following examples are to this hair Bright explanation and the invention is not limited in following examples.
Embodiment 1.
It is such as necessary without water is received referring to shown in Fig. 1-2, return and take out the former neat stress back-heating type heat-exchange system of Anti-leakage type and can be reduced to return Take out Anti-leakage type original/neat stress back-heating type heat-exchange system.Return and take out Anti-leakage type original/neat stress back-heating type heat-exchange system including desulfurizing tower 15th, recuperative heat exchanger, a flue 1（Former flue gas is to recuperative heat exchanger flue）, No. two flues 2（Former flue gas is extremely after cooling Desulphurization system flue）, No. three flues 3（Neat stress is to recuperative heat exchanger flue）, flusher 5, No. four flues 4（After heating Neat stress is to chimney air flue）, substitute airduct 6, border pumping groove 7, return exhaust column 8, return air exhauster 9, No. five flues 10（Return exhausting Machine is to a flue air pipe）With chimney 11.Recuperative heat exchanger includes heat accumulating element, neat stress point storehouse 12, former flue gas point storehouse 13 A point storehouse 14 is substituted with carrying.Former flue gas point storehouse 13, carrying substitute point storehouse 14 and neat stress point storehouse 12 and run rotation along heat accumulating element Direction is set gradually.Former flue gas point storehouse 13 leads to the former flue gas of high temperature, and neat stress point storehouse 12 leads to the neat stress of low temperature.Carry to substitute and divide Storehouse 14 is logical to substitute air and former flue gas.Heat accumulating element is substituted in neat stress point storehouse 12, former flue gas point storehouse 13 and carrying in point storehouse 14 Rotate.
The logical former flue gas of the entrance of a number flue 1, the outlet of a flue 1 is connected with the entrance in former flue gas point storehouse 13, former cigarette Gas enters former flue gas point storehouse 13 by a flue 1, and former flue gas divides in storehouse 13 to heat accumulating element heat release in former flue gas, so as to original Flue gas is cooled.The outlet in former flue gas point storehouse 13 is connected with the entrance of No. two flues 2, the outlet of No. two flues 2 and desulfurizing tower 15 entrance connection, the former flue gas after cooling carries out desulfurization by No. two flues 2 by former flue gas point storehouse 13 into desulfurizing tower 15, takes off Former flue gas after sulphur turns into neat stress.The outlet of desulfurizing tower 15 is connected with the entrance of No. three flues 3, the outlet of No. three flues 3 with The entrance connection in neat stress point storehouse 12, neat stress enters via No. three flues 3 to be heated up in neat stress point storehouse 12.Neat stress point The outlet in storehouse 12 is connected with the entrance of No. four flues 4, and the outlet of No. four flues 4 is connected with chimney 11.Neat stress after heating from Neat stress point storehouse 12 is opened, enters chimney 11 via No. four flues 4, and then be discharged into air.
In the above-mentioned course of work, the former flue gas before wet type desulfurizing Tower System is introduced into the former cigarette of progress before desulfurizing tower 15 is entered Qi leel storehouse 13 cools, so that heat is discharged to heat accumulating element, former flue gas cool-down, heat accumulating element heating, the former cigarette after cooling Gas enters desulphurization system again（Desulfurizing tower 15）Carry out desulfurization process and become neat stress, neat stress, which is returned again in neat stress point storehouse 12, to be absorbed The heat that heat accumulating element absorbs from former flue gas（Now heat accumulating element enters neat stress point storehouse by rotation from former flue gas point storehouse 13 12）, discharge is warming up to without " white cigarette " phenomenon temperature, and neat stress to the chimney 11 after heating is discharged.The condensation separated out by smokeless Water rinses heat accumulating element, need to set up flusher 5, prevents from blocking.Flusher 5 is arranged on by recuperative heat exchanger.
The junction in former flue gas point storehouse 13 and neat stress point storehouse 12 is provided with border pumping groove 7, and former flue gas point storehouse 13 is with taking The junction for substituting point storehouse 14 is provided with border pumping groove 7.Border pumping groove 7, which is connected with, returns exhaust column 8, carries and substitutes a point storehouse 14 are connected with and return exhaust column 8, return to be connected with outside exhaust column 8 and return air exhauster 9, return air exhauster 9 and a flue 1 passes through No. five flues 10 Connection.Set in the entrance for carrying replacement point storehouse 14 and substitute airduct 6, the outlet and carrying of border pumping groove 7 substitute point storehouse 14 Air exhauster 9 is returned in outlet setting.By returning the operation of air exhauster 9, former flue gas is eliminated to the carrying leakage of neat stress and is directly revealed, A small amount of former flue gas, neat stress and the replacement wind extracted returns and delivers to a flue 1 via No. five flues 10, carries out desulfurization process. Various flues are according to site space reasonable Arrangement, it is ensured that can pass through enough exhaust gas volumn and air capacity under rational resistance.Take out Air drain connects former flue gas, neat stress, returns exhaust column 8, and air exhauster 9 is returned in setting, it is ensured that return the static pressure of exhaust column 8 minimum.Return air exhauster 9 The former flue gas of extraction, wet neat stress, clean flue gas and substitute the gaseous mixture of air and be returned to a flue 1, with former flue gas to de- Sulphur system carries out desulfurization process, prevents former flue gas from being revealed to neat stress.
Preferably, heat accumulating element is connected with drive device in the present embodiment, drive device selects motor 24.The band of motor 24 Dynamic heat accumulating element.
Preferably, wet type desulfurizing Tower System includes desulfurizing tower 15 in the present embodiment, it is provided with the side wall of desulfurizing tower 15 Slurry pipe 23.
Preferably, being provided with demister 19 in No. four flues 4 in the present embodiment.
So that former flue-gas temperature is 130 DEG C, the neat stress temperature of former desulphurization system outlet is 50 DEG C as an example, with heat accumulating element Rotation, smoke temperature change flow：Former flue gas（130 DEG C are down to 100 DEG C）→ neat stress（50 DEG C are down to 80 DEG C）；Accumulation of heat member device Part temperature change flow：Former flue gas point storehouse 13（100℃-70℃）→ neat stress point storehouse 12（70℃-100℃）；Carry to substitute and divide Storehouse 14 is much smaller compared to other points of storehouses, is not considered.
Embodiment 2.
Take out the former neat stress back-heating type heat-exchange system of Anti-leakage type referring to shown in Fig. 3-4, returning and can be reduced to receive water type original/neat stress Back-heating type heat-exchange system.Receiving water type original/neat stress back-heating type heat-exchange system includes desulfurizing tower 15, recuperative heat exchanger, a cigarette Road 1（Former flue gas is to recuperative heat exchanger flue）, No. two flues 2（Former flue gas is to desulphurization system flue after cooling）, No. three flues 3 （Wet neat stress is to recuperative heat exchanger flue）, water collector, flusher 5, connection flue 25（Cooling is received neat stress after water and returned Huis heater flue）, No. four flues 4（Clean flue gas is to chimney air flue after heating）, substitute airduct 6, border pumping groove 7th, return exhaust column 8, return air exhauster 9, No. five flues 10（Air exhauster is returned to a flue air pipe）With chimney 11.In the present embodiment, Neat stress is divided into wet neat stress and clean flue gas.The heat accumulating element for the enamel that recuperative heat exchanger is easily rinsed including use anti-corrosion, Former flue gas point storehouse 13, carrying substitute a point storehouse 14, dry flue gas point storehouse 16, cooling wind separating bin 18 and wet flue gas and divide storehouse 17.Cool down wind point Storehouse 18 is connected with cooling blower.Heat accumulating element substitutes a point storehouse 14, dry flue gas point storehouse 16, cooling wind in former flue gas point storehouse 13, carrying Divide and rotated in storehouse 18 and wet flue gas point storehouse 17.
Preferably, heat accumulating element is connected with drive device in the present embodiment, drive device selects motor 24.
Preferably, wet type desulfurizing Tower System includes desulfurizing tower 15 in the present embodiment, it is provided with the side wall of desulfurizing tower 15 Slurry pipe 23.
Preferably, being provided with demister 19 in No. four flues 4 in the present embodiment.
Preferably, being provided with flusher 5 in the present embodiment by recuperative heat exchanger, water collector includes receiving tank 20 With catch pit 21, catch pit 21 is arranged at the lower section of receipts tank 20, and catch pit 21 is connected with water pump 22.
Cooling down wind separating bin 18, wet flue gas point storehouse 17, former flue gas divides storehouse 13, carrying to substitute point storehouse 14 and the dry flue gas point edge of storehouse 16 Heat accumulating element traffic direction is set gradually.Connected between dry flue gas point storehouse 16 and wet flue gas point storehouse 17 by connecting flue 25.It is former Flue gas point storehouse 13 leads to the former flue gas of high temperature, and former flue gas is cooled by heat accumulating element, and heat accumulating element absorbs the heat of former flue gas release Amount is warmed；Dry flue gas point storehouse 16 is logical to be received the clean flue gas after water by cooling, and clean smoke absorption heat accumulating element is at former flue gas The heat of absorption is discharged after being heated up to chimney 11, and heat accumulating element is cooled；Cooling wind separating bin 18 walks surrounding air, enters one Step cooling heat accumulating element；Walk desulfurizing tower 15 in wet flue gas point storehouse 17（Desulphurization system）Wet neat stress out, wet neat stress is by from cold But the heat accumulating element of wind separating bin 18 cools, and the wet neat stress after cooling separates out its supersaturation water and becomes clean flue gas, does Neat stress is by connecting flue 25 from wet flue gas point storehouse 17 into dry flue gas point storehouse 16, and heat accumulating element is heated by wet neat stress；Take Band substitutes point storehouse 14 and substitutes the former flue gas of Air blowing for utilizing.Receive tank 20 and be located at the lower section of wet flue gas point storehouse 17.
Border pumping groove 7, former flue gas point storehouse 13 and carrying replacement point are set between former flue gas point storehouse 13 and wet flue gas point storehouse 17 Pumping groove 7 in border is set between storehouse 14.Border pumping groove 7, which is connected with, returns exhaust column 8, returns to be connected with outside exhaust column 8 and returns air exhauster 9, returns Air exhauster 9 is connected with a flue 1 by No. five flues 10, and flusher 5 is provided with by recuperative heat exchanger.Various flue roots According to site space reasonable Arrangement, it is ensured that enough exhaust gas volumn and air capacity can be passed through under rational resistance.Border pumping groove 7 connects Connect former flue gas, wet neat stress, clean flue gas, return exhaust column 8, air exhauster 9 is returned in setting, it is ensured that return the static pressure of exhaust column 8 minimum.Return and take out The gaseous mixture of former flue gas, wet neat stress, clean flue gas and replacement air that blower fan 9 is extracted is returned to No. one via No. five flues 10 Flue 1, carries out desulfurization process with former flue gas to desulphurization system, prevents former flue gas from being revealed to neat stress.A point storehouse 14 is substituted carrying Entrance sets replacement airduct 6, and the outlet of border pumping groove 7 and the outlet in carrying replacement point storehouse 14 set and return air exhauster 9.By returning exhausting The operation of machine 9, eliminates former flue gas to the carrying leakage of wet/clean flue gas and directly reveals, a small amount of former flue gas, the net cigarette extracted Gas and the original flue gases duct for substituting wind foldback, carry out desulfurization process.
The logical former flue gas of the entrance of a number flue 1, the outlet of a flue 1 is connected with the entrance in former flue gas point storehouse 13, former cigarette Gas enters former flue gas point storehouse 13 by a flue 1, and former flue gas, to heat accumulating element heat release, is dropped in former flue gas point storehouse 13 Temperature.The outlet in former flue gas point storehouse 13 is connected with the entrance of desulfurizing tower 15, and the former flue gas after cooling enters de- by former flue gas point storehouse 13 Sulphur tower 15 carries out desulfurization, and the former flue gas after desulfurization turns into wet neat stress.The outlet of desulfurizing tower 15 connects with the entrance of No. three flues 3 Logical, the outlet of No. three flues 3 is connected with the entrance in wet flue gas point storehouse 17, and wet neat stress enters wet flue gas point via No. three flues 3 In storehouse 17, by being cooled to heat accumulating element heat release, the oversaturated condensed water in part is separated out.Separate out the wet net cigarette after condensed water Gas turns into clean flue gas.Clean flue gas is by connecting flue 25 by wet flue gas point storehouse 17 towards dry flue gas point storehouse 16.Dry flue gas point The outlet in storehouse 16 is connected with the entrance of No. four flues 4, and the outlet of No. four flues 4 is connected with chimney 11.Clean flue gas leaves dry cigarette Qi leel storehouse 16, enters chimney 11, and then be discharged into air via No. four flues 4.
Wet desulphurisation system（Desulfurizing tower 15）Before, former flue gas is introduced into the cooled cooling release heat in former flue gas point storehouse 13, Become vapour-saturated wet neat stress after desulfurization process, wet neat stress enters back into the cooling that is cooled of wet flue gas point storehouse 17 and separated out Saturation water becomes clean flue gas, and the clean flue gas received by cooling after water, which finally enters back into dry flue gas point storehouse 16 and absorbs heat accumulating element, to be released The heat put, until discharge is without " white cigarette " phenomenon temperature, the clean flue gas after heating is discharged via chimney 11.Cool down heat accumulating element Low-temperature receiver be surrounding air, the part supersaturation water separated out after wet neat stress is cooled is recycled after being collected by water collector.
The present embodiment can be divided into former flue gas and cyclically-varying of both heat accumulating element.
Former flue gas is to heat accumulating element release heat cooling in former flue gas point storehouse 13, and the former flue gas after cooling passes through No. two cigarettes Road 2, which enters, carries out the former flue gas after desulfurization process, desulfurization process as wet neat stress in desulfurizing tower 15, wet neat stress is via No. three Flue 3 enters wet flue gas point storehouse 17, and release heat is to heat accumulating element in wet flue gas point storehouse 17 for wet neat stress, while separating out saturation Condensed water rinse heat accumulating element, separate out condensed water after wet neat stress turn into clean flue gas, by connecting flue 25 by wet cigarette Qi leel storehouse 17 enters dry flue gas point storehouse 16, and clean flue gas absorbs the heat discharged in heat accumulating element in dry flue gas point storehouse 16, into Without " white cigarette state ", to be finally discharged into air via chimney 11.
Heat accumulating element cooling wind separating bin 18 in cooled by surrounding air, until temperature be reduced to wet neat stress temperature with Under, then heat accumulating element is turned in wet flue gas point storehouse 17 via motor 24, is absorbed heat from wet neat stress, is heated up. Then heat accumulating element carries out rotating into former flue gas point storehouse 13 again via motor 24, and heat accumulating element absorbs heat from former flue gas Further heat up, then heat accumulating element turns to heat release in dry flue gas point storehouse 16 and cooled again.Last heat accumulating element is rotated again Further cooled by surrounding air into cooling wind separating bin 18.Repeat the above steps.
By taking former 130 DEG C of flue-gas temperature, 20 DEG C of environment temperature, former 50 DEG C of desulphurization system exit gas temperature as an example, with storage The rotation of thermal element, smoke temperature change flow：Former flue gas（130 DEG C are down to 105 DEG C）→ clean flue gas（44 DEG C rise to 69 DEG C） → wet neat stress（48 DEG C are down to 44 DEG C）；Accumulation of heat component temperature change flow：Former flue gas point storehouse 13（100℃-75℃）→ dry Flue gas point storehouse（80℃-55℃）→ cooling wind separating bin 18（50℃-30℃）→ wet flue gas point storehouse（40℃-25℃）；Wherein environment Air temperature variations are 20 DEG C → 40 DEG C, carry to substitute and divide storehouse 14 much smaller compared to other points of storehouses, are not considered.（Note：Wet net cigarette It is due to enter desulphurization system after former flue gas is cooled that temperature degree, which takes 48 DEG C, and the heat for bringing desulphurization system into is reduced, and it exports net Flue gas saturation temperature step-down.）
In the present embodiment, heat exchange main body, recuperative heat exchanger are used as using the recuperative heat exchanger of heat exchange efficiency height, volume compact Including using anti-corrosion and being easy to the heat accumulating element of enamel rinsed, to prevent flue gas in the corrosion and flue gas of recuperative heat exchanger Dust and flue gas carry slurries droplet and block heat exchange element.Recuperative heat exchanger is divided into Wu Fencang, accumulation of heat member according to its function Part one way order trend is followed successively by：Wet flue gas point storehouse 17（Heating）, former flue gas point storehouse 13（Heat up again）, carry substitute a point storehouse 14, Dry flue gas point storehouse（Cooling）, cooling wind separating bin 18（Cool again）；Carried out with handling process, flue gas change order is followed successively by：High temperature Clean flue gas after clean flue gas → heating is received after water in wet neat stress → cooling after the former flue gas → desulfurization of former flue gas → low temperature；Each point of storehouse Effect is respectively：The wet neat stress cooling that desulphurization system outlet comes is received water by wet flue gas point storehouse 17, and former flue gas divides storehouse 13 by former cigarette Air cooling reclaims the heat of its release, carries and substitutes the carrying leakage that point storehouse 14 is used to eliminate heat accumulating element generation, dry flue gas point The heat transfer reclaimed in former flue gas is allowed to warm to without " white cigarette " exhaust temperature by storehouse to clean flue gas, and cooling wind separating bin 18 is adopted With surrounding air by dry flue gas point storehouse come heat accumulating element further cooling make its can cool down desulfurizing tower 15 come out wet net cigarette Gas.；For directly revealing, border is set to be evacuated groove 7 in former flue gas point storehouse 13 and the dry flue gas point boundary of storehouse 16, in former flue gas point Storehouse 13 and the wet flue gas point boundary of storehouse 17 set border to be evacuated groove 7, produce static pressure and are taken out less than former flue gas and returning for clean flue gas Airduct 8, former flue gas and neat stress to the one-way flow of exhaust column 8 is returned, make former flue gas not revealed to neat stress.Such as needed without receipts water Ask, then heat accumulating element directly reclaims the former flue gas heat of high temperature, passes to neat stress, is reduced to receive water type type original/neat stress backheat Formula heat-exchange system.
By using antiseptic property is good, the ceramic heat accumulating element that easily rinses, the blockage problem of recuperative heat exchanger is solved. The method for substituting point storehouse 14 is carried by setting, the carrying leakage of heat accumulating element is eliminated；Taken out by setting border to be evacuated groove 7 and return The method of blower fan 9, eliminates the direct leakage of recuperative heat exchanger, reaches former flue gas to the purpose of neat stress No leakage.The system Direct contact heat transfer mode can be used to the former neat stress of coal unit wet desulfurization system with method to exchange heat, heat exchange is improved Effect, meanwhile, the intrinsic former flue gas of recuperative heat exchanger is eliminated to the leakage of neat stress, it is ensured that coal burning flue gas desulfurization is imitated Rate is not reduced.
Furthermore, it is necessary to explanation, the specific embodiment described in this specification, is named the shape of its parts and components Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment The modification of various kinds or supplement or using similar mode substitute, without departing from the present invention structure or surmount present claims Scope defined in book, all should belong to protection scope of the present invention.

Claims (10)

1. one kind, which is returned, takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type, including desulfurizing tower, a flue, No. three flues and cigarette Chimney, the outlet of desulfurizing tower is connected with the entrance of No. three flues, it is characterised in that：Also include No. two flues, No. four flues and backheat Formula heat exchanger, recuperative heat exchanger includes heat accumulating element, carries replacement Fen Cang, former flue gas point storehouse and neat stress point storehouse, accumulation of heat member Part is connected with drive mechanism, and former flue gas point storehouse, carrying substitute point storehouse and neat stress point traffic direction of the storehouse along heat accumulating element successively Set, the outlet of a flue is connected with the entrance in former flue gas point storehouse, the outlet in former flue gas point storehouse connects with the entrance of No. two flues Logical, the outlet of No. two flues is connected with the entrance of desulfurizing tower, and the outlet of No. three flues is connected with the entrance in neat stress point storehouse, net cigarette The outlet in qi leel storehouse is connected with the entrance of No. four flues, and the outlet of No. four flues is connected with chimney.
2. according to claim 1 return takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type, it is characterised in that：The former cigarette The junction in qi leel storehouse and neat stress point storehouse is provided with border pumping groove, and the junction that former flue gas point storehouse substitutes point storehouse with carrying is set Border pumping groove is equipped with, the outlet for substituting point storehouse is carried and border pumping groove is respectively connected with and returns exhaust column, return and be connected with outside exhaust column Air exhauster is returned, air exhauster is returned and is connected with a flue, flusher is provided with by recuperative heat exchanger.
3. according to claim 1 or 2 return takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type, it is characterised in that：It is described Recuperative heat exchanger also includes cooling wind separating bin, and neat stress point storehouse includes dry flue gas point storehouse and wet flue gas point storehouse, dry flue gas point storehouse Connection flue is provided between wet flue gas point storehouse, is connected between dry flue gas point storehouse and wet flue gas point storehouse by connecting flue, it is former Flue gas point storehouse, carry and substitute a point storehouse, dry flue gas point storehouse, cooling wind separating bin and wet flue gas point storehouse along heat accumulating element traffic direction successively Set, the entrance in wet flue gas point storehouse and the outlet of No. three flues, the outlet in dry flue gas point storehouse connects with the entrance of No. four flues Logical, cooling wind separating bin is connected with cooling blower.
4. according to claim 3 return takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type, it is characterised in that：The former cigarette The junction in qi leel storehouse and wet flue gas point storehouse is provided with border pumping groove, and the junction that former flue gas point storehouse substitutes point storehouse with carrying is set Border pumping groove is equipped with, the entrance for carrying replacement point storehouse is connected with replacement airduct.
5. according to claim 3 return takes out the former neat stress back-heating type heat-exchange system of Anti-leakage type, it is characterised in that：The wet cigarette It is provided with below qi leel storehouse in captation, No. four flues and is provided with fog-proof device.
6. a kind of returning as described in claim 1-5 any claims takes out the work of the former neat stress back-heating type heat-exchange system of Anti-leakage type Make method, comprise the following steps：Former flue gas enters desulfurizing tower by a flue, and former flue gas is after the desulfurization process of desulfurizing tower As neat stress, neat stress flows to chimney by No. three flues, it is characterised in that：Comprise the following steps that：
1）Former flue gas first passes around former flue gas point storehouse, then enters back into desulfurizing tower and carries out desulfurization process；In this step, heat accumulating element In former flue gas point storehouse, former flue gas makes heat accumulating element heat up, while former flue gas is cooled in neat stress point storehouse；
2）Step 1）In, the former flue gas after cooling is entered by No. two flues to be carried out after desulfurization process, desulfurization process in desulfurizing tower Former flue gas turn into neat stress, neat stress initially enters neat stress point storehouse by No. three flues and heated up, then neat stress from Open neat stress point storehouse and go to chimney by No. four flues；In this step, heat accumulating element rotates by drive mechanism effect, stores Thermal element enters neat stress point storehouse by former flue gas point storehouse, and temperature is raised under heat accumulating element effect of the neat stress after heating.
7. according to claim 6 return the method for work for taking out the former neat stress back-heating type heat-exchange system of Anti-leakage type, its feature exists In：The outlet for cooling down the entrance and cooling wind separating bin of wind separating bin is connected with surrounding air, and wet flue gas point storehouse is connected with wet neat stress, former Flue gas point storehouse is connected with former flue gas, and dry flue gas point storehouse is connected with clean flue gas, and the entrance for carrying replacement point storehouse is connected with surrounding air；
Former flue gas is to heat accumulating element release heat cooling in former flue gas point storehouse, and the former flue gas after cooling is entered by No. two flues The former flue gas after desulfurization process, desulfurization process is carried out in desulfurizing tower as wet neat stress, wet neat stress enters via No. three flues Wet flue gas point storehouse, release heat is to heat accumulating element in wet flue gas point storehouse for wet neat stress, while separating out supersaturation water rinses accumulation of heat Element, separating out the wet neat stress after supersaturation water turns into clean flue gas, and clean flue gas is entered by connecting flue by wet flue gas point storehouse Enter dry flue gas point storehouse, clean flue gas absorbs the heat discharged in heat accumulating element in dry flue gas point storehouse, air is discharged into via chimney；
Heat accumulating element is cooled in cooling wind separating bin by surrounding air, until the temperature of heat accumulating element is reduced to the temperature of wet neat stress Below degree, then heat accumulating element enters in wet flue gas point storehouse, and heat is absorbed from wet neat stress and is heated up, then heat accumulating element Into in former flue gas point storehouse, heat accumulating element absorbs heat from former flue gas and further heated up, and then heat accumulating element is turned to again Heat release cools in dry flue gas point storehouse, and last heat accumulating element is turned to again further to be cooled in cooling wind separating bin by surrounding air.
8. according to claim 7 return the method for work for taking out the former neat stress back-heating type heat-exchange system of Anti-leakage type, its feature exists In：The supersaturation water of precipitation carries out on-line rinsing to heat accumulating element.
9. returning according to claim 7 or 8 takes out the method for work of the former neat stress back-heating type heat-exchange system of Anti-leakage type, its feature It is：Captation collects the supersaturation water separated out after wet neat stress is cooled.
10. returning according to claim 7 or 8 takes out the method for work of the former neat stress back-heating type heat-exchange system of Anti-leakage type, it is special Levy and be：Cooling blower provides power and surrounding air is passed through into cooling wind separating bin.
CN201710261825.2A 2017-04-20 2017-04-20 Back-pumping leakage-proof original clean flue gas back-heating type heat exchange system and working method thereof Active CN107101216B (en)

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