CN110131742A

CN110131742A - The full ingredient of boiler exhaust gas based on waste heat driving is administered and resource utilization mode

Info

Publication number: CN110131742A
Application number: CN201910518926.2A
Authority: CN
Inventors: 李先庭; 赵健飞; 张茂勇; 石文星; 王宝龙; 陈炜; 刘世刚; 韩志刚; 张海鹏; 岑俊平; 熊烽; 陈军; 张刚刚; 王福东; 刘利刚
Original assignee: Beijing Qing Technology Research Institute Co Ltd Datian Energy Industry; Tsinghua University
Current assignee: Beijing Qing Technology Research Institute Co Ltd Datian Energy Industry; Tsinghua University
Priority date: 2019-06-16
Filing date: 2019-06-16
Publication date: 2019-08-16
Anticipated expiration: 2039-06-16
Also published as: CN110131742B

Abstract

The full ingredient of boiler exhaust gas based on waste heat driving is administered and resource utilization mode, belongs to smoke gas treatment and circular economy technical field.Contain a large amount of vapor and its residual heat resources for status boiler smoke, tail feathers carries the problem of more particulate pollutant especially can largely penetrate particulate matter and sour gas, while recycling flue dust using hot precipitator, condensed water is recycled using step condensation film decontamination mode, the sour gas such as a large amount of sulfur dioxide in flue gas tail feathers, it may filter that particulate matter, can penetrate in particulate matter can flocculated particle object and dissolvable particulate matter etc., and it is carried by condensed water and divides the realizations such as salt crystallization apparatus to recycle water resource comprehensively eventually by waste heat evaporation and be converted into building materials and the raw material of industry etc., and by recovery waste heat for driving the smoke recycling development process, with be diverted to heat, heating process water or combustion air etc. realize heat, it is wet, comprehensive resource utilization of dangerous waste object, and it realizes nearly zero cost operation or even generates saving energy and cost economic benefit.

Description

The full ingredient of boiler exhaust gas based on waste heat driving is administered and resource utilization mode

Technical field

The present invention relates to the full ingredient improvement of the boiler exhaust gas driven based on waste heat and resource utilization modes, belong to flue gas and control Reason and circular economy technical field.

Background technique

Containing big in the smoke evacuation of boiler, all types of industries kiln using the heating of the combustion of fossil fuel such as fire coal, natural gas etc. The vapor of amount and many gaseous states, solid contaminant become the important pollutant sources for influencing atmospheric environment, and administer mist at present Haze and vision disappear it is white etc. belong to society and police department focus of attention environmental issue, and enterprise also pays close attention to its realization simultaneously Technical feasibility, economic feasibility and running secondary pollution problem, that is, waste liquid and solid waste be further processed mode and Its cost issues.But the understanding and understanding for influencing haze mechanism and degree etc. to the haze origin cause of formation, smoke evacuation at present need to be deepened, So that coal-burning boiler smoke evacuation administer etc. direction, mode, need Depth Study in method, and the mating solution of industry and enterprise Certainly scheme and system, technical effect, investment and performance driving economy and enterprise's endurance etc. need to be deepened investigation.At present boiler or Several major issues existing for the smoke gas treatments such as kiln field and phenomenon include: one is the mechanism that boiler exhaust gas influences haze And degree；The second is boiler exhaust gas has carried out the smoke components after minimum discharge is administered and the Influencing Mechanism to haze；The third is Deep treatment flue gas is inherently eliminated or at least significantly slows its technological approaches to haze contribution degree to reach；The fourth is companion How raw waste liquid, solid waste solve, whether have a possibility that resource utilization and its technological approaches；The fifth is the technology of realization Whether whether the key technology of approach, key equipment have feasibility, technical effect and can confirm to haze or the white influence that disappears, And technology, economic condition and policy environment for whether having industrialization promotion etc..

Several important background technologies of the invention are described below.

(1) about the technical research background of the haze origin cause of formation.

For convenience of the technological approaches that discussion solves the problems, such as, it is necessary to recognize current people for the general of haze first It is summarized as follows with analysis.Haze weather is a kind of atmosphere pollution state, and haze is super to suspended particulate substance contents various in atmosphere Target is generally stated, and wherein haze is the aerosol systems of the particulate matter composition of dust, sulfuric acid (salt), nitric acid (salt) in air etc. And dysopia is caused, it itself is both a kind of pollutant that wherein particulate matter, which is only the arch-criminal for aggravating haze weather pollution, It is the carrier of the noxious materials such as heavy metal, polycyclic aromatic hydrocarbon again.The distribution of haze particle is relatively uniform, and the scale ratio of gray haze particle Smaller, from 0.001 micron to 10 micron, average diameter is about in 1~2 microns, and be invisible to the naked eye particle showy in the air Object.The chemical composition of aerosol is sufficiently complex, it contains various trace meters, inorganic oxide, sulfate, nitrate and oxygen-containing Organic compound etc..Sulfur Dioxide In The Atmosphere converts the sulfate to be formed, and is one of main component of aerosol.Sulphur is aerosol Interior most important element, content can reflect the situation of global migration, transmission and the distribution of pollutant.Nitrate in aerosol With the Forming Mechanism of organic matter, wait to study.Aerosol from industrial area various elements (such as chlorine, tungsten, silver, manganese, cadmium, zinc, Antimony, nickel, arsenic, chromium etc.), just there is biggish regional disparity.Weather scientist indicates that haze weather is formed both by the shadow of meteorological condition It rings, it is also related with Air Pollutant Emission increase.The source of haze is varied, for example vehicle exhaust, industrial discharge, building are raised Dirt, waste incineration, volcanic eruption etc., haze weather are usually that a variety of pollution sources immixtures are formed.

Haze is harmful to the human body after the respiratory tract of sucking people, and such as long-term sucking, serious person will lead to death.It is exhaled to human body Apparently, 10 microns or more of particle, normal detention is in nasal cavity and nasopharynx throat for the harm in suction road；2~10 microns of particle is most of Stay in the upper respiratory tract, and 2 microns of particles below increase with the reduction of partial size in the ratio that intrapulmonary is detained, 0.1 micron or less The ratio adhered in bronchus with the reduction of partial size of particle increase.Since the floating particle object of granular tiny in haze is straight Diameter is generally at 0.01 micron hereinafter, directly can enter bronchus or even lung by respiratory system.So haze influence is maximum Be exactly the respiratory system of people, caused by disease be concentrated mainly in the diseases such as respiratory disease, cranial vascular disease, nasal cavity inflammation.

In conclusion haze is in relatively stable aerosol state as a kind of atmosphere under certain meteorological condition, Sour gas therein such as sulfur dioxide, nitrogen oxides, particulate matter it is coefficient as a result, wherein the partial size in particulate matter compared with Particulate matter in small person, that is, 0.001-0.1 micron range is more readily formed relatively stable aerosol state and haze and is formed One of principal element；Simultaneously, it is considered that it is also even more serious to the threat of human health, naturally also mainly exerting except haze One of power direction.

(2) new discovery and its progress that boiler exhaust gas influences haze.

Recent years implements the environmental emission reduction of more wheel generalities to contaminating enterprises such as coal-burning power plants and proposes effect, achieves pole Big effect, especially thermal power plant generally realize minimum discharge index, i.e. flue dust not higher than 5mg/Nm3, sulfur dioxide It is no more than 50mg/Nm3 more than 35mg/Nm3, nitrogen oxides, but air pollution is not resolved fundamentally, heavy fog haze Polluting weather still happens occasionally.The national standard (GB16157-1996) of the existing particulate matter measurement in China at present, only measures It is greater than the particle of 0.45 micron (PM0.45).That the one particulate matter less than PM0.45 whether can be haze another main reason , through wet desulfurizer generate white flue gas in contain a large amount of dissolved particles (TDS-Total Dissolved Solids), refer to the solid particulate matter summation for being dissolved in liquid, partial size is (big usually between several nanometers of zero point to several hundred nanometers Majority is less than monitoring scale PM0.45 at present).Wet desulfurizer exiting flue gas contains a large amount of supersaturation water steam, causes chimney Appearance " white pinniform mist hangover " phenomenon, actual measurement prove that it contains a large amount of vapor, also contain a large amount of dissolved particles and have Evil heavy metal is floated in air after chimney discharge, with being evaporated for moisture, is hanged for a long time with extremely subtle particulate matter Float among atmosphere.Usual PM2.5 particle can suspend 100 hours in an atmosphere, and PM1 particle can suspend 1000 small in an atmosphere When, and this smaller particle (PM0.45 or less) suspension time is longer, it more difficult to it settles, as meteorological condition and damp condition are suitable Suitable quick agglomerate, forms aerosol (Aerosol), haze is caused to pollute.

August 15 days to August 30th in 2017 has carried out fine survey to Tianjin Guo electricity Jin Neng Thermal Power Co., Ltd 1# unit Amount.The environmental protection facilities such as unit denitration, dedusting, the desulfurization and major project put into operation on August 12nd, 2009 simultaneously.The unit Environmental protection tests are up to standard (granular material discharged to be less than 10mg/Nm3).Method by being washed with distilled water, test obtain three groups of numbers According to reasonable expectation dissolved particles are the cureless major reasons of haze accordingly, and measured result is analyzed as follows.

(1) in this test, there is the dissolution of 87 milligrams/standard cubic meter after Limestone-gypsum Wet Flue Gas Desulfurization Process, in flue gas Grain discharge；After wet electrical dust precipitator, still there is 76 milligrams/standard cubic meter.The two data, much higher than in ultra-clean discharge The granular material discharged existing national standard for being less than 10 milligrams/standard cubic meter.This explanation: 1) it wet type desulfurizing after can generate side by side A large amount of dissolved particles out；2) wet electrical dust precipitator is little to the elimination effect of these dissolved particles, cannot function as removing dissolution The device option of grain；3) these dissolved particles are extremely subtle and be missed, and have fled from the sight of people, advanced freely, and " closed Method " atmosphere has been discharged into it.

(2) assessment of dissolved particles Emission amount calculation and pollution.With the discharge dissolution of the unit (capacity 330MW) actual measurement Grain amount, can calculate it and discharge dissolved particles amount to atmosphere is about 131 kgs/hour；Then capacity 1000MW unit boiler is discharged fume Dissolved particles discharge rate be 397 kgs/hour.Haze " quick-fried table " concentration is 500 μ g/m3, which discharges molten per hour Grain amount is solved, under conditions of spreading bad, the airspace of about 2km (length) x2km (width) x200m (height) can be made to reach " quick-fried Table " concentration.

(3) China is used for about 9.0625 hundred million kilowatts of coal-fired total installation of generating capacity of power generation, and 99% has all installed wet type desulfurizing dress additional It sets.It is calculated by above data, only one dissolved particles discharge of Desulphurization for Coal-fired Power Plant is as high as about 2,600,000 tons/year.Here it not yet wraps Include the users such as coking, steel-making, chemical industry, cement, Industrial Boiler.In addition, " evaporation of splashing " formula cooling is also the discharge of dissolved particles Rich and influential family.If these are included, estimation dissolved particles (TDS) discharge can be close to or higher than 10,000,000 tons/year.The pollution Object total amount is even more than our known dust total emission volumns, in addition longer suspension time.Therefore it follows that dissolved particles are Lead to the another major reason of haze.

(4) vapor pH value is analyzed in flue gas.PH value is surveyed usually in 2-3, after this vapor enters atmosphere, such as rain It, will form acid rain (this strong oxidized water steam annual emissions are up to 900,000,000 tons or more).This is because catalytic denitration (SCR) More SO2 in flue gas are made to be converted into SO3, current wet type desulfurizing, it is extremely difficult to remove SO3；Along with " the escaping of ammonia " in denitration Phenomenon makes vapor in smoke evacuation have " highly acid ".

In conclusion coal-burning boiler smoke evacuation largely contains the lesser dissolved particles of partial size in the flue gas after wet desulphurization, Its actual content in the case where realizing " ultralow " discharge reaches 70~100mg/Nm3 grades, is equivalent to even greater than at present The sum of the content of the three classes detection pollutant of " ultralow " discharge, therefore not real minimum discharge are realized, but because of its mesh The preceding enough attention that be not included in monitoring range and do not cause people, but the sour gas of itself and escape is difficult to after being desulfurized tower Wet electric precipitator captures, to become what influence atmospheric environment and haze in smoke evacuation at present were formed by being largely discharged into atmosphere One of principal element.

(3) about flue gas disappear white concept, essence and value technology analysis.

More than ten a provinces and cities including Shanghai, Tianjin, Hebei etc. launch respectively the provincial standard in relation to " disappearing white " at present, Wherein the southern areas such as Shanghai often require that the wider high-altitude diffusion that flue dust smoke evacuation is realized by improving flue-gas temperature, to subtract Few dust-like to ground and neighbouring air pollutes, and realizes vision " disappearing white ".But different from southern area, the north disappears white standard Winter is not required to completely eliminate visual white pollution, such as the ground such as Tianjin, Hebei policy goal disappears white target and essence: It is realized by condensing heat-exchange and the hazes pollutant such as effectively reduces water vapour content, effectively reduces soluble salt, mitigate " white cigarette " vision Pollution.

White critical issue, essence and its value of environmental protection of disappearing, which first consist in, is greatly decreased each pollutant such as soluble salt, again Metal, sour gas etc. influence haze and the key factor that is detrimental to health, next be only mitigation and eliminate " white haze " this Visual pollution, and each pollutant contained by flue gas cannot be effectively administered if mainly solving visual pollution, it is this " disappearing white " has increased significantly electric energy, reheated steam thermal energy etc. instead, increases energy consumption and corresponding disposal of pollutants in rain, has no reality Meaning should go again and cautiously prove or even cancel such so-called " disappearing white " behavior put the cart before the horse, climbed a tree to seek fish.

(4) guiding patented technology development Overview.

(1) recycling of fume afterheat depth and the latest development for the white technology that disappears.

The scientific research institutions such as Tsinghua University combine exploitation with enterprise and have promoted a variety of flue gas waste heat recovery patented technologies, In " be based on the circulating flue gas waste heat recovery heat supply process of vapor heat-carrying " seriation patented technology achievement, including " be based on water The boiler exhaust gas wet direct recovery method of heat and device of steam heat-carrying circulation " (2017104371042), " a kind of nicotinic acids Boiler exhaust gas total heat recovery and flue gas disappear white device " (2017206805342) etc., success has been carried out by demonstration project Verifying, and be put into Shandong Province's the 8th batch of power-saving technology of 2018 year and promote catalogue, use direct heat exchange mode rather than by heat Pump, which can be realized, is reduced to about 30 DEG C for exhaust gas temperature, while recycling a large amount of vapor latent heat and its water resource, reduces 70%~80% or more water vapour content in flue gas, thus realize significantly disappear it is white；Can reduce simultaneously may filter that particulate matter (flue gas exists Line monitoring parameters) 30%~50%, more importantly the soluble acids such as sulfur dioxide and hydrogen chloride gas can be cut down substantially To 0, gypsum, soluble salt, heavy metal etc. can be reduced by 60%~80% or more, namely substantially eliminated many passes in the haze origin cause of formation Keyness factor.

(2) flue gas institute's containing water vapor and pollutant component carry out the feasibility and its technological approaches of resource utilization.

Mature technological approaches includes: that dust can be recycled as building materials raw material etc. by deduster at present；By de- Sulphur tower removal sulfur dioxide is simultaneously converted into gypsum.

Realize that the flue gas pollutant ingredient after minimum discharge can be transferred to recirculated water by condensation or spray washing method In, but overflow externally discharged waste water therein need to find the technical approach of resource utilization.Status industry high-salt wastewater and dangerous waste salt are tight Heavily contaminated environment, and the technology road of processing method such as pretreatment conventional at present+film process+MVR evaporation or multiple-effect evaporation etc. Line, but greatest problem existing for the technology is: initial cost is huge and operation energy consumption and operation and maintenance expenses are with excessively high, leads to most enterprises Industry is difficult to undertake the cost of sewage and the comprehensive resource utilization of dangerous waste salt.

Sewage evaporation crystallization and money based on waste heat driving are creatively used by Tsinghua University Li Xianting professor team The technical approach that sourceization recycles evaporates power consumption, multiple-effect instead of conventional MVR using the waste heat of the industrial enterprises such as steam power plant The high-grade energies such as evaporation consumption vapour realize that the evaporation of highly concentrated stain disease divides salt, pass through abraum salt resource utilization as driving heat source It is final to realize that sewage zero-discharge, main patent achievement include: a kind of " sewage zero-discharge and resource based on the driving of steam power plant's waste heat Recovery system (2018214627233) ", " it is a kind of using waste heat driving desulfurization wastewater recycling and crystal salt purification system (2018214381695) " etc..

Initial cost can be greatly reduced in the technical approach, energy operating cost can also be greatly reduced, and can save simultaneously original Process system includes water resource tax, charges for disposing pollutants, process O&M expense etc..

Above-mentioned thermal method sewage zero-discharge and resource reclaim seriation patented technology based on waste heat driving, is the full ingredient of flue gas It administers and its resource utilization of pollutant provides solid technical foundation.

(3) precise measurement of smoke components and its influence to haze.

Beijing Environmental Science Institute Shi Aijun, Beijing Zhao Jian Fei Deng expert team, He Chen wisdom energy science and technology limited liability company are logical It crosses using new-type high-precision nano-scale particle detecting instrument and measurement method, to particulate matter polymorphic in wet desulfurization flue gas Measurement method and component characteristics carry out theoretical research and engineering measurement, show the distribution situation of 11 kinds of leading ions in its smoke evacuation such as Under: the ion containing sulfate radical, inferior sulfate radical accounts for 82% or more of gross mass, is the main source of PM2.5；Content of nitrite Also relatively more, therefore it is necessary to by sol particle object etc. can escaping particles object be included in monitoring and treatment range.

(4) the technology development of hot precipitator.

Using the filtrate of the materials such as basalt and its succeeding in developing for exhaust dust device with bag, and static bag type dust-remover It the exploitation of technology and successfully promotes, can realize efficient stable reliably dedusting in high temperature flue gas i.e. 300~350 DEG C or so, then It is remarkably improved the catalytic effect of high temperature denitrating catalyst thereafter, to improve denitration performance index, avoid in catalyst Its investment and operating cost is effectively reduced in poison.

(5) the wall-type heat exchange technology development of high efficiency low cost.

The successful development of the extrusion molded aluminium finned heat exchanger of surface anticorrosion is carried out using graphene, alternative status is adopted With the heat exchanger of the special materials such as expensive metal or fluoroplastics, there is the low material consumption of strong alkali-acid resistance burn into, service life length, dimension Shield amount is small etc., is suitble to use in the case where boiler smoke has strong corrosive or even depth moisture condensation working condition.

In conclusion preposition property technology of the status in relation to flue gas waste heat recovery, smoke components depth analysis and its to haze Influence research, flue gas waste heat recovery technology and sewage zero-discharge and its technical research such as resource utilization based on waste heat driving With promote achievement, for realize the anti-haze of flue gas full ingredient administer and pollutant resources recovery technology development provide it is important Technical conditions.

Summary of the invention

The purpose of the present invention and task be, show for the full constituent analysis of above-mentioned boiler exhaust gas its there are a large amount of soluble salts Escape etc. significantly affects the problem of haze forms and pollutes air, using classification processing system technology and a variety of key news Achievement realizes the sewage zero-discharge of hi-temp hi-effective dedusting, NO_x Reduction by Effective, the full ingredient improvement of step of waste heat driving, waste heat driving And its process flows such as resource utilization, effectively cutting down the statuses such as vapor, soluble salt, sour gas in smoke evacuation can escape dirt Object is contaminated, to realize the boiler exhaust gas tool anti-haze of essence and the white improvement that disappears, and the pollutant of removing is subjected to resource utilization It utilizes, realizes that environmental benefit develops simultaneously with circular economy, the environment protection treating of flue gas is changed into the sustainable warp of exploitation flue gas resource Ji development.

Remove haze mechanism, smoke recycling developing principle and the technological approaches of foundation of the present invention are summarized as follows.First, using high Warm deduster first to flue gas ash removal, be re-fed into high temperature denitrification apparatus denitration efficiency can be improved and be further reduced NOx content, Catalyst poisoning is avoided, excessive spray ammonia amplitude is reduced and reduces amount of ammonia slip.Second, helping to reduce the desulfurizing agent in desulfurizing tower The stability of poisoning, the stability for guaranteeing desulphurization system operation and desulfurization effect.Third, depth depositing dust process is no longer used to depth The degree removal wet electric precipitator of dissolved particles and sour gas without substantial role, but be changed to using completely new step condensed water Film decontaminates module, and the mechanism of use includes: that wet desulphurization exiting flue gas is in the oversaturated aerosol form for having both mist, haze property State, a part in nano-scale particle (0.001~0.1 micron order) therein and sour gas by with droplet, scale compared with The formation such as big particulate matter collision, cohesion can settle the mixture of scale, by removing part liquid-solid mixture removal；Pass through Condensing heat-exchange, all kinds of particulate matters and sour gas in flue gas carry removal with condensed water；Water-bath principle, that is, pass through recirculated water Particulate matter especially dissolved particles and sour gas in spray effect washing flue gas；Water film dedusting principle is that is, big by creating The effects of amount inertial collision that wall surface liquid film directly contact with flue gas, baffling washes away etc., Brownian movement and direct absorption mechanism, greatly Amount absorption absorbs particulate matter especially dissolved particles and sour gas in flue gas；Chimney hot pressing and high-altitude diffusion principle, i.e., greatly Width reduce the flue gas of smoke temperature and its water vapour content again row heat temperature raising, improve buoyancy lift and hot pressing is poor, gas of raising throat Stream floating, purification emission effect of high-altitude diffusion etc..Fourth, the recycling of flue gas pollutant is developed, in addition to conventional deduster Except, waste heat drive by way of recycle its water resource, residual heat resources and by solid waste by flocculation sedimentation, divide salt crystallization etc. turn Become the raw material of industry, building materials raw material etc. and carries out resource utilization.

Specific descriptions of the invention are: the full ingredient of boiler exhaust gas based on waste heat driving is administered and resource utilization mode, Haze system, resource recovery process are removed using what the process flow administered by the full ingredient of one group of flue gas and resource utilization utilizes formed Vapor of the system to be greatly reduced in flue gas, escaping particles object and can may filter that including the soluble salt of nano-scale dimension Big aerosol caused by discharging fume is eliminated comprehensively or effectively inhibited to particulate matter, the sour gas including sulfur dioxide and hydrogen chloride Haze influence factor and realize waste heat recycling driving except haze technical process and resource conversion and recovery process process, feature exist It is administered in the full ingredient of: the boiler exhaust gas and resource utilization mode and its system process includes that high temperature or middle low temperature remove Dirt process, the recycling of step waste heat of condensation and moisture film depolluting processes, middle-temperature section flue gas heat recovery process, condensation water are back to desulfurization benefit Water and demineralized water water process, desulfurization wastewater zero-emission and resource utilization process, wherein specific process flow is as follows:

I. firstly, medium temperature flue gas heating surface 1a in the outlet smoke temperature in the back-end surfaces of boiler 1 between 300~350 DEG C Exhanst gas outlet be provided with hot precipitator 2, flue gas through high-temperature dust removal is sent into denitrification apparatus 3, eliminates generation denitration catalyst The technical conditions of agent poisoning and the stabilization high temperature denitration for realizing efficient low cost, during which hot precipitator 2 is recycled as building materials Dust resource；

Ii. second, the primary purifying flue gas after high-temperature dust removal and high temperature denitration enter the existing middle low-temperature flue gas of boiler by Hot face 1b simultaneously carries out efficient stable heat exchange under the technical conditions for avoiding dust fouling, subsequently into middle-temperature section flue gas heat recovery device 6 recycling primary purifying obvious heat of smoke and the heat source as waste heat air preheater 4 and waste heat crystallizing evaporator 8b, wherein waste heat is empty Pre- device 4 carries out the preheating of second level sensible heat to boiler auxiliary combustion wind；

Iii. third, flue gas, which goes successively to desulfurizing tower 7, carries out sweetening process, desulfurization wastewater is sent into the evaporation of desulfurization wastewater waste heat and divides salt Module 8 is crystallized, recycling water resource, raw material of industry resource including gypsum and heavy metal stabilization including industrial grade sodium chloride are closed Building materials raw material resources including object；

Iv. fourth, the gas inlet that flue gas after desulfurization is sent into step condensation film decontamination module 9 carries out deep purifying, Cong Xiaxiang On successively by gas inlet section 9k and multistage washing condensation film decontamination apparatus, module 9 is being decontaminated by step condensation film Tower top outlet flue pass out to Atmospheric Diffusion discharge, during which include the vapor in flue gas, the soluble salt including nano-scale dimension Inside escaping particles object and can may filter that particulate matter and the sour gas including sulfur dioxide and hydrogen chloride, followed by spray Ring water and condensed water absorption absorption, which are intercepted and settled, falls within tower bottom pond 9l, and the extra condensed water of tower bottom pond 9l is used as desulfurization Technique moisturizing in tower circulating cooling make-up water and factory including demineralized water water preparation process；

V. fifth, the high-temperature residual heat water of tower bottom pond 9l is fed to waste heat user heater 10 for heating water return and technique Return water is preheated, and a part of the remaining hot water after cooling is re-fed into complete hot air preheater 11 and carries out the first order to boiler auxiliary combustion wind Full heat preheating, realizes and recycles to the step of fume afterheat resource especially latent heat waste heat；

Vi. sixth, low temperature cold source is sprayed through circulation in the rest part conduct of the remaining hot water after the cooling of waste heat user heater 10 Lower washing heat exchanger 9g is driven to carry out condensing heat-exchange and washing flue gas after shower device 9f spray, the remaining hot water of complete hot air preheater 11 goes out Water carries out the heat exchange of more deep condensation as washing heat exchanger 9d in driving after the washed spray equipment 9c spray of low temperature cold source and washes Flue gas is washed, while low temperature cold source feeding partition condenser 9h is cold to flue gas progress partition in a part conduct of heat user return water H0 It is solidifying to exchange heat and flue gas condensed is made to bear water the outside wall surface formation moisture film in partition condenser 9h by absorbing suction-operated purifying smoke；

Vii. seventh, waste heat crystallizing evaporator 8b sewage side secondary steam Q be sent into secondary steam heat regenerator 8c after heat release it is cold The water resource that condensed water QN is recycled after solidifying, the secondary waste heat water water outlet J2 for being heated side are sent to the white heat exchange that disappears as reheating heat source High-altitude diffusion discharge after device 9a realizes the reheating heating of low temperature and low humidity purifying smoke, improves buoyancy lift.

Realize that the full ingredient of boiler exhaust gas driven based on waste heat is administered and resource utilization system includes high temperature or middle low temperature Dedusting module, the recycling of step waste heat of condensation and moisture film decontamination module, middle-temperature section flue gas heat recovery module, condensation water are back to desulfurization Moisturizing and demineralized water water module, desulfurization wastewater zero-emission and resource utilization module, wherein specific process system is as follows:

I. the outlet smoke temperature in the back-end surfaces of the gas inlet of hot precipitator 2 and boiler 1 is between 300~350 DEG C The exhanst gas outlet of medium temperature flue gas heating surface 1a is connected, the gas inlet phase of the exhanst gas outlet and denitrification apparatus 3 of hot precipitator 2 Even, the exhanst gas outlet of denitrification apparatus 3 is connected with the gas inlet of middle low-temperature flue gas heating surface 1b, and the bottom of hot precipitator 2 is set It is equipped with the discharge port of dust discharge D；

Ii. outlet flue of the exiting flue gas of middle low-temperature flue gas heating surface 1b after boiler body air preheater and middle-temperature section flue gas heat are returned The gas inlet for receiving device 6 is connected, and the exhanst gas outlet of middle-temperature section flue gas heat recovery device 6 is communicated with the gas inlet of desulfurizing tower 7, medium temperature The healed water outlet of section flue gas heat recovery device 6 respectively with the high temperature side water inlet of waste heat air preheater 4 and waste heat crystallizing evaporator The high temperature side water inlet of 8b is connected, the healed water import of middle-temperature section flue gas heat recovery device 6 high temperature with waste heat air preheater 4 respectively Side water outlet is connected with the high temperature side water outlet of waste heat crystallizing evaporator 8b, and the combustion air outlet air (A2) of waste heat air preheater 4 goes out Mouth is connected with the combustion-supporting wind inlet of boiler body air preheater, the import of the combustion air air inlet (A1) of waste heat air preheater 4 and full heat sky The combustion air outlet of pre- device 11 is connected；

Iii. desulfurizing tower 7 is discharged S and enters buffer pool 7a, the outlet pipe of the desulphurization circulating return water SH of buffer pool 7a circulating water outlet with The water inlet pipe of desulfurization moisturizing B2 and the water inlet pipe of desulphurization circulating water supply SG communicate, and buffer pool 7a is additionally provided with the discharge port of gypsum SS With the discharge outlet of desulfurization wastewater P1, wherein the discharge outlet of desulfurization wastewater P1 and the evaporation of desulfurization wastewater waste heat divide salt crystallization module 8 The feed inlet of Wastewater Pretreatment pond 8a communicates, and Wastewater Pretreatment pond 8a is additionally provided with dosing import including the gypsum and again of medicament G The outlet of the discharge gate and desulfurization wastewater pretreated water P2 of the desulfurization solid waste SP of building materials raw material including stabilized metal chemical combination object, The outlet of desulfurization wastewater pretreated water P2 is connected with the feed inlet of waste heat crystallizing evaporator 8b, and waste heat crystallizing evaporator 8b is also set up There are the outlet of the discharge port and sewage side secondary steam Q of industrial grade sodium chloride NC, the outlet and secondary steaming of sewage side secondary steam Q The air intake of vapour heat regenerator 8c is connected, secondary steam heat regenerator 8c be additionally provided with secondary steam condensed water QN water outlet and The import and export of low temperature side healed water, wherein secondary steam heat regenerator 8c secondary waste heat water water outlet J2 outlet with disappear it is white The water inlet of heat exchanger 9a is connected, the import of the secondary waste heat water water inlet J1 of secondary steam heat regenerator 8c and the white heat exchanger 9a that disappears Water outlet be connected；

Iv. the exhanst gas outlet of desulfurizing tower 7 is connected with the gas inlet of step condensation film decontamination module 9, and step condensation film is removed The internal incrustation of dirty module 9 successively includes following condensation washing, purifying process structure or device: gas inlet section 9k from bottom to top Condensation film decontamination apparatus is washed with multistage, the top exhanst gas outlet of multistage washing condensation film decontamination apparatus is through step condensed water The tower top outlet flue of film decontamination module 9 is communicated with outside atmosphere, and the lower part of gas inlet section 9k is provided with tower bottom pond 9l；

V. the high-temperature residual heat water out of tower bottom pond 9l is heated with the outlet pipe of moisturizing B, waste heat user respectively after water circulating pump Import, the cooling-tower circulating water import of the high temperature side water inlet R1 of device 10 communicates, the moisturizing of the outlet pipe and desulfurization moisturizing B2 of moisturizing B The water supply pipe of technique moisturizing B1 in pipe and factory including demineralized water water communicates, and the high temperature side of waste heat user heater 10 goes out The water inlet of the water inlet with middle low temperature cold source through circulating sprayer 9f and complete hot air preheater 11 is connected respectively for the outlet of water R2, The low temperature side-entrance of waste heat user heater 10 water inlet with the return pipe of heat user return water H0 and partition condenser 9h respectively It communicates, the outlet of the low temperature side of waste heat user heater 10 water outlet H2 is respectively with the outlet of the water outlet H2 of partition condenser 9h and in advance The outlet pipe of heat user return water H3 communicates after heat；

Vi. the water outlet in the tower bottom pond of complete hot air preheater 11 is communicated with the water inlet of showering washing device 9c, complete hot air preheater 11 air inlet is communicated with inlet air of boiler A0, the combustion air air inlet A1's of the air outlet and waste heat air preheater 4 of complete hot air preheater 11 Import communicates.

Step condensation film decontaminates the multistage washing condensation film decontamination apparatus inside module 9, successively includes from bottom to top Following condensation washing, purifying technical process and device: washing condensation rain belt 9j, direction rectifier 9i, partition condenser 9h, under wash Wash heat exchanger 9g, circulating sprayer 9f, washing demister 9e, upper washing heat exchanger 9d, showering washing device 9c, demister 9b, disappear white heat exchanger 9a, the top air side for the white heat exchanger 9a that disappears and the tower top outlet flue phase of step condensation film decontamination module 9 It is logical.

Hot precipitator 2 uses the sack cleaner structure of basalt filtering material.

Complete hot air preheater 11 is using the direct contact type spray heat exchange having to boiler auxiliary combustion wind progress heating and moistening function Tower structure.

Medium temperature flue gas heating surface 1a, middle low-temperature flue gas heating surface 1b, waste heat air preheater 4, middle-temperature section flue gas heat recovery device 6, White heat exchanger 9a, partition condenser 9h disappear using the extrusion molded aluminium fin heat exchange pipe structure for being cladded with grapheme material.

Lower washing heat exchanger 9g, upper washing heat exchanger 9d are all made of strong alkali-acid resistance corrosion and resistance to fouling dirt is blocked up type condensation and changed Hot material.

Showering washing device 9c import washing solution Na use pH value for 7~10 dilute solution of sodium hydroxide.

The present invention, which carries more particulate pollutant for status boiler smoke tail feathers, especially can largely penetrate particulate matter (PM0.3 and following) and sour gas, the problem of belonging to one of haze main reason and pollution near floor level environment, using high temperature Deduster improves denitrification apparatus efficiency and eliminates wherein poison root source, and water is greatly reduced using step condensation film decontamination module and steams The sour gas such as gas, sulfur dioxide, hydrogen chloride may filter that particulate matter (FPM), can penetrate agglomerating in particulate matter (EPM) Grain object (CPM) and dissolvable particulate matter (DPM), the diffusion discharge of cleaning smoke evacuation high-altitude, fundamentally substantially cut down or substantially eliminate Boiler exhaust gas forms haze and the substantive of ambient air environment adversely affects.

Meanwhile the important driving force of haze technical process is removed as step by waste heat recycling, one side flue gas heat release generates While a large amount of condensed waters removal vapor, absorption or the more sour gas of absorption, escaping particles object and it can may filter that particle Object etc.；On the other hand the more high-grade waste heat of a part use to carry out reheating to exiting flue gas with realize vision disappear white and raising its Diffusion effect in an atmosphere, the pollutant concentration that neighbouring airspace is effectively reduced；Meanwhile to wash away lower part overcurrent wall surface clear for condensed water Except further absorbing by moisture film while sticking pollutant or adsorb more pollutants；In turn, following for tower bottom pond is fallen into The temperature of ring water improves, can be transferred their heat in the heat user return water of downstream by heat exchanger and realize UTILIZATION OF VESIDUAL HEAT IN, is cooled Water spray equipment be then transported to by water pump continue depth recovered flue gas condensed water and absorption or absorption pollutant, extra condensation Water is then discharged and is recycled as desulfurization moisturizing etc..

In turn, it is recycled by waste heat as the wastewater disposition water zero discharge and its resource utilization for having stored flue gas pollutant The main drive of process carries out classification processing to content, wherein passing through dosing while realizing its whole water resource of recycling Precipitating heavy-metal ion removal is simultaneously converted into firm compound state and can be used as building materials raw material；Salt is divided to crystallize work by waste heat evaporation Phosphate radical is converted gypsum by skill, converts the raw materials of industry such as industrial grade sodium chloride for chlorine root, to realize pollutant to resource Transformation.

Finally, extracting the residual heat resources of flue gas difference grade using hierarchical approaches, and it is respectively used to above-mentioned driving process, and Economize on coal for heating boiler combustion air, heating heat supply network return water or process water are realized and save steam etc., to generate more aobvious The energy-saving benefit of work, and energy conservation inherently correspondingly reduces fuel consumption and its discharge amount of pollution.

Above-mentioned energy-saving benefit and resource reclaim remarkable benefit, it is achieved that gas pollution control, resource utilization and section The multiple effects such as energy benefit, realize energy conservation and the integrated governance process of emission reduction, to realize the ring with economic benefit Investment and operation are protected, administering field in the depth energy saving recycling and emission reduction of boiler exhaust gas has significant technology economy advantage.

It on the other hand, can be a large amount of by vapor waste heat of condensation when this system has biggish heat load demand in winter It is diverted to recuperation of heat heating；But it needs to find other than it can be used for preboiler air inlet partially to save fuel in non-heating period The downstreams heat users such as process water heating could realize UTILIZATION OF VESIDUAL HEAT IN benefit, otherwise when more waste heat can not be utilized, Zhi Nengyi The part of waste heat is lost in atmosphere by cooling tower etc. is separately arranged, but still needs to expend a part of moisturizing, water pump and wind at this time Machine power consumption etc., to realize above-mentioned step condensation film depolluting processes to reach depth and reduce smoke pollution discharge and summer view Feel the white purpose that disappears.

Detailed description of the invention

Fig. 1 is system schematic of the invention.

Each unit number and title are as follows in Fig. 1.

Boiler 1, medium temperature flue gas heating surface 1a, middle low-temperature flue gas heating surface 1b, hot precipitator 2, low temperature dedusting in routine Device 2d, denitrification apparatus 3, waste heat air preheater 4, air-introduced machine 5, middle-temperature section flue gas heat recovery device 6, desulfurizing tower 7, buffer pool 7a, desulfurization Waste water residual heat evaporation divide salt crystallization module 8, Wastewater Pretreatment pond 8a, waste heat crystallizing evaporator 8b, secondary steam heat regenerator 8c, Step condensation film decontamination module 9, demister 9b, showering washing device 9c, upper washing heat exchanger 9d, is washed the white heat exchanger 9a that disappears Wash away day with fog 9e, circulating sprayer 9f, the washing heat exchanger 9g that rains, partition condenser 9h, direction rectifier 9i, washing condensation Area 9j, gas inlet section 9k, tower bottom pond 9l, waste heat user heater 10, complete hot air preheater 11, inlet air of boiler A0, combustion air Enter the wind A1, combustion air outlet air A2, moisturizing B, technique moisturizing B1, desulfurization moisturizing B2, dust discharge D, heat user return water H0, low temperature side disengaging Heat user return water H3, heating water outlet J1, heating water inlet J2, washing solution Na, ammonia after water H1, partition leaving condenser water H2, preheating Water NH3, sewage side secondary steam Q, condensed water QN, hot water R, high temperature side water inlet R1, high temperature side water outlet R2, cooling tower water inlet R3, Cooling tower return water R4, desulfurizing tower water outlet S, desulphurization circulating return water SH, desulphurization circulating water supply SG, disengaging pond blowdown SS, high temperature remove Dirt device import flue gas Y1, hot precipitator exiting flue gas Y2, denitration outlet flue gas Y3, boiler export flue gas Y4, desulfurizing tower Exiting flue gas Y5, step condensation film decontaminate module outlet flue gas Y6.

Specific embodiment

Fig. 1 is system schematic and embodiment of the invention.

Specific embodiments of the present invention 1 are as follows.The full ingredient of boiler exhaust gas based on waste heat driving is administered and resource utilization Mode removes haze system, resource time using what the process flow administered by the full ingredient of one group of flue gas and resource utilization utilizes formed Knock off process system be greatly reduced in flue gas vapor, including the soluble salt of nano-scale dimension can escaping particles object and It may filter that particulate matter, the sour gas including sulfur dioxide and hydrogen chloride, eliminate comprehensively or effectively inhibit caused by smoke evacuation Atmospheric haze influence factor and realize waste heat recycling driving except haze technical process and resource conversion and recovery process process, it is special Sign is: the full ingredient of the boiler exhaust gas administer and resource utilization mode and its system process include high temperature or in it is low Warm dust removal process, the recycling of step waste heat of condensation and moisture film depolluting processes, middle-temperature section flue gas heat recovery process, condensation water are back to de- Sulphur moisturizing and demineralized water water process, desulfurization wastewater zero-emission and resource utilization process, wherein specific process flow is as follows:

If being not provided with the hot precipitator 2, cold precipitator 2d in routine is set, and wherein low temperature removes in routine The gas inlet of dirt device 2d is communicated with the exhanst gas outlet of boiler 2, in routine the exhanst gas outlet of cold precipitator 2d and desulfurizing tower 7 or The gas inlet of middle-temperature section flue gas heat recovery device 6 communicates.

If being not provided with the desulfurizing tower 7 of the wet desulphurization, but furnace high-temperature dry method or semi-dry desulphurization dress are set It sets, then the circulating water outlet of buffer pool 7a is changed to the water inlet communicated with the outlet pipe of moisturizing B, the desulfurization wastewater P1 of buffer pool 7a Discharge outlet still be changed to carry out sewage zero-discharge to the outer draining of a part for carrying out self-water replenishing B and the desulfurization of salt crystallization function divided to give up The evaporation of water waste heat divides the feed inlet of the Wastewater Pretreatment pond 8a of salt crystallization module 8 to communicate.

Above-described embodiment 1 is suitable for the boiler exhaust gas comprehensive treatment and recycling development and utilization of grassroot project, and it is newly-built or The Industrial Stoves of Reconstruction Project or the depth of technique flue gas remove haze is administered and recycling develops and uses etc., but generally for existing For coal-burning boiler system, flue gas back-end surfaces, even denitrification apparatus etc. is caused all to be integrated in boiler body, without empty enough Between hot precipitator is mounted in boiler body, or high temperature flue gas is drawn out to after hot precipitator and returns again to former flue It is interior, therefore, it is difficult to directly apply, then can be transformed by the method for following specific embodiment 2.

Specific embodiments of the present invention 2 are as follows.

If it is conventional that setting can be changed to because the reasons such as in-site installation space are not suitable for hot precipitator 2 described in setting Middle cold precipitator 2d, wherein the gas inlet of cold precipitator 2d is communicated with the exhanst gas outlet of boiler 2 in routine, low in routine The exhanst gas outlet of warm deduster 2d is communicated with the gas inlet of desulfurizing tower 7 or middle-temperature section flue gas heat recovery device 6.This specific embodiment Other system flows and feature it is identical as specific embodiment 1.

Specific embodiments of the present invention 3 are as follows.

If existing boiler uses dry method or semi-dry desulphurization mode, that is, it is not provided with the desulfurizing tower 7 of wet process mode, then medium temperature The gas inlet that the exhanst gas outlet of section flue gas heat recovery device 6 is changed to decontaminate module 9 with step condensation film communicates.This specific implementation The other system flows and feature of example are identical as above-mentioned specific embodiment 1.At this time after dry type desulfurizing and high-temperature dust removal, high temperature denitration Flue gas cleaning degree it is very high, all kinds of heat exchangers on exhaust gases passes hereafter, including middle low-temperature flue gas heating surface 1b, boiler are existing The heat exchange element fume side of air preheater, middle-temperature section flue gas heat recovery device 6 etc. solves fouling blockage, reduces efficiency, is fixed The intrinsic problems such as corrosion are accelerated in phase deashing and maintenance.

It should be noted that the invention proposes carry out full compositional depth improvement and its resource utilization side to boiler exhaust gas Formula gives to eliminate the influence factor to haze and surrounding enviroment pollution and how to use step except haze mode, UTILIZATION OF VESIDUAL HEAT IN Mode and recycling return water mode realize specific implementation method, process and the implementing device of above-mentioned purpose, and according to this totality Solution can have specific implementation device of different specific implementation measure and different structure, and above-mentioned specific embodiment is only It is one such, the embodiment of any other like simple deformation, for example, by using different heat exchange structures；Increase or Reduce several layers step control measures；Or simple adjustment remaining hot water system pipeline connection method, Inlet and outlet water source and classification Quantity；Or the mode of texturing etc. that average expert personage is contemplated that is carried out, or by the technical approach with the same or similar knot Structure be applied to different dynamic equipment discharge fume or air draft type, etc. and other similar application occasions, each fall within protection model of the invention It encloses.

Claims

1. the full ingredient of boiler exhaust gas based on waste heat driving is administered and resource utilization mode, using by one group of flue gas entirely at dividing and ruling The process flow composition that reason and resource utilization utilize removes haze system, resource recovery process system to be greatly reduced in flue gas Vapor, including the soluble salt of nano-scale dimension can escaping particles object and may filter that particulate matter including sulfur dioxide and Sour gas including hydrogen chloride is eliminated comprehensively or is effectively inhibited atmospheric haze influence factor caused by discharging fume and realizes that waste heat returns That receives driving removes haze technical process and resource conversion and recovery process process, it is characterised in that: the full ingredient of the boiler exhaust gas Improvement and resource utilization mode and its system process include high temperature or middle low temperature dust removal process, the recycling of step waste heat of condensation And moisture film depolluting processes, middle-temperature section flue gas heat recovery process, condensation water are back to desulfurization moisturizing and demineralized water water process, desulfurization Wastewater zero discharge and resource utilization process, wherein specific process flow is as follows:

Firstly, the medium temperature flue gas heating surface in the outlet smoke temperature in the back-end surfaces of boiler (1) between 300~350 DEG C The exhanst gas outlet of (1a) is provided with hot precipitator (2), and the flue gas through high-temperature dust removal is sent into denitrification apparatus (3), eliminates generation The technical conditions of denitrating catalyst poisoning and the stabilization high temperature denitration for realizing efficient low cost, during which hot precipitator (2) returns Receive the dust resource for being used as building materials；

Second, the primary purifying flue gas after high-temperature dust removal and high temperature denitration enters the existing middle low-temperature flue gas heating surface of boiler (1b) and efficient stable heat exchange is carried out under the technical conditions for avoiding dust fouling, subsequently into middle-temperature section flue gas heat recovery device (6) primary purifying obvious heat of smoke and the heat source as waste heat air preheater (4) and waste heat crystallizing evaporator (8b) are recycled, wherein Waste heat air preheater (4) carries out the preheating of second level sensible heat to boiler auxiliary combustion wind；

Third, flue gas, which goes successively to desulfurizing tower (7), carries out sweetening process, desulfurization wastewater is sent into the evaporation of desulfurization wastewater waste heat and divides salt knot Crystal module (8), recycling water resource, the raw material of industry resource including industrial grade sodium chloride including gypsum and heavy metal are stablized Building materials raw material resources including compound；

Fourth, the gas inlet that flue gas after desulfurization is sent into step condensation film decontamination module (9) carries out deep purifying, from bottom to top Successively by gas inlet section (9k) and multistage washing condensation film decontamination apparatus, module is being decontaminated by step condensation film (9) tower top outlet flue passes out to Atmospheric Diffusion discharge, during which includes vapor in flue gas, including the solvable of nano-scale dimension It escaping particles object and can may filter that particulate matter and the sour gas including sulfur dioxide and hydrogen chloride including salt, be sprayed Recirculated water and condensed water absorption absorption, which are intercepted and settled, to be fallen within tower bottom pond (9l), and the extra condensed water of tower bottom pond (9l) is used Make the technique moisturizing in desulfurizing tower circulating cooling make-up water and factory including demineralized water water preparation process；

Fifth, the high-temperature residual heat water of tower bottom pond (9l) is fed to waste heat user heater (10) for heating water return and work Skill return water is preheated, and a part of the remaining hot water after cooling is re-fed into complete hot air preheater (11) and carries out the to boiler auxiliary combustion wind The full heat preheating of level-one, realizes and recycles to the step of fume afterheat resource especially latent heat waste heat；

Sixth, low temperature cold source is through circulated sprinkling in the rest part conduct of the remaining hot water after the cooling of waste heat user heater (10) Lower washing heat exchanger (9g) is driven to carry out condensing heat-exchange and washing flue gas, the waste heat of complete hot air preheater (11) after device (9f) spray Water water outlet carries out more deep condensation as washing heat exchanger (9d) in driving after the washed spray equipment of low temperature cold source (9c) spray Heat exchange and washing flue gas, while low temperature cold source is sent into partition condenser (9h) to cigarette in a part conduct of heat user return water (H0) Gas carries out indirect condensation and flue gas condensed is made to bear water the outside wall surface formation moisture film in partition condenser (9h) by absorbing absorption Act on purifying smoke；

Seventh, the sewage side secondary steam (Q) of waste heat crystallizing evaporator (8b) is sent into secondary steam heat regenerator (8c) heat release afterwards The water resource that condensed water (QN) is recycled after condensation, the secondary waste heat water water outlet (J2) for being heated side is sent to as reheating heat source to disappear High-altitude diffusion discharge after white heat exchanger (9a) realizes the reheating heating of low temperature and low humidity purifying smoke, improves buoyancy lift.

2. the full ingredient improvement of boiler exhaust gas and resource utilization mode as described in claim 1 based on waste heat driving, special Sign be the full ingredient improvement of boiler exhaust gas that the realization drive based on waste heat and resource utilization system include high temperature or in Low temperature dedusting module, the recycling of step waste heat of condensation and moisture film decontamination module, middle-temperature section flue gas heat recovery module, condensation water are back to Desulfurization moisturizing and demineralized water water module, desulfurization wastewater zero-emission and resource utilization module, wherein specific process system is such as Under:

Outlet smoke temperature in the gas inlet of hot precipitator (2) and the back-end surfaces of boiler (1) is between 300~350 DEG C The exhanst gas outlet of medium temperature flue gas heating surface (1a) be connected, the flue gas of the exhanst gas outlet of hot precipitator (2) and denitrification apparatus (3) Import is connected, and the exhanst gas outlet of denitrification apparatus (3) is connected with the gas inlet of middle low-temperature flue gas heating surface (1b), hot precipitator (2) bottom is provided with the discharge port of dust discharge (D)；

Outlet flue of the exiting flue gas of middle low-temperature flue gas heating surface (1b) after boiler body air preheater and middle-temperature section flue gas heat are returned The gas inlet for receiving device (6) is connected, the gas inlet phase of the exhanst gas outlet and desulfurizing tower (7) of middle-temperature section flue gas heat recovery device (6) It is logical, the healed water outlet of middle-temperature section flue gas heat recovery device (6) respectively with the high temperature side water inlet and waste heat of waste heat air preheater (4) The high temperature side water inlet of crystallizing evaporator (8b) is connected, the healed water import of middle-temperature section flue gas heat recovery device (6) respectively with it is remaining The high temperature side water outlet of hot air preheater (4) is connected with the high temperature side water outlet of waste heat crystallizing evaporator (8b), waste heat air preheater (4) The outlet of combustion air outlet air (A2) be connected with the combustion-supporting wind inlet of boiler body air preheater, the combustion air of waste heat air preheater (4) The import for entering the wind (A1) is connected with the combustion air outlet of complete hot air preheater (11)；

Desulfurizing tower (7) is discharged (S) and enters buffer pool (7a), and the desulphurization circulating return water (SH) of buffer pool (7a) circulating water outlet goes out Water pipe is communicated with the water inlet pipe of the water inlet pipe of desulfurization moisturizing (B2) and desulphurization circulating water supply (SG), and buffer pool (7a) is additionally provided with stone The discharge port of cream (SS) and the discharge outlet of desulfurization wastewater (P1), wherein the discharge outlet of desulfurization wastewater (P1) and desulfurization wastewater waste heat steam Hair divides the feed inlet in the Wastewater Pretreatment pond (8a) of salt crystallization module (8) to communicate, and Wastewater Pretreatment pond (8a) is additionally provided with medicament (G) dosing import, including gypsum and heavy metal stabilization close object including building materials raw material desulfurization solid waste (SP) discharge The outlet of mouth and desulfurization wastewater pretreated water (P2), outlet and waste heat crystallizing evaporator (8b) of desulfurization wastewater pretreated water (P2) Feed inlet be connected, waste heat crystallizing evaporator (8b) is additionally provided with the secondary steaming of discharge port and sewage side of industrial grade sodium chloride (NC) The outlet of the outlet of vapour (Q), sewage side secondary steam (Q) is connected with the air intake of secondary steam heat regenerator (8c), secondary steaming Vapour heat regenerator (8c) is additionally provided with the water outlet of secondary steam condensed water (QN) and the import and export of low temperature side healed water, The outlet of the secondary waste heat water water outlet (J2) of middle secondary steam heat regenerator (8c) is connected with the water inlet for the white heat exchanger (9a) that disappears, The import of the secondary waste heat water water inlet (J1) of secondary steam heat regenerator (8c) is connected with the water outlet for the white heat exchanger (9a) that disappears；

The exhanst gas outlet of desulfurizing tower (7) is connected with the gas inlet of step condensation film decontamination module (9), and step condensation film is removed The internal incrustation of dirty module (9) successively includes following condensation washing, purifying process structure or device: gas inlet section from bottom to top (9k) and multistage washing condensation film decontamination apparatus, the top exhanst gas outlet of multistage washing condensation film decontamination apparatus are cold through step The tower top outlet flue of condensate film decontamination module (9) is communicated with outside atmosphere, and the lower part of gas inlet section (9k) is provided with tower bottom water Pond (9l)；

The high-temperature residual heat water out in tower bottom pond (9l) adds with the outlet pipe of moisturizing (B), waste heat user respectively after water circulating pump Import, the cooling-tower circulating water import of the high temperature side water inlet (R1) of hot device (10) communicate, the outlet pipe of moisturizing (B) and desulfurization moisturizing (B2) water supply pipe of the technique moisturizing (B1) in water supply pipe and factory including demineralized water water communicates, waste heat user's heater (10) water inlet with middle low temperature cold source through circulating sprayer (9f) and full heat are empty respectively for the outlet of high temperature side water outlet (R2) The water inlet of pre- device (11) is connected, the low temperature side-entrance of waste heat user heater (10) return water with heat user return water (H0) respectively Pipe and the water inlet of partition condenser (9h) communicate, the outlet of the low temperature side water outlet (H2) of waste heat user heater (10) respectively with The outlet pipe of heat user return water (H3) communicates behind the outlet and preheating of the water outlet (H2) of partition condenser (9h)；

The water outlet in the tower bottom pond of complete hot air preheater (11) is communicated with the water inlet of showering washing device (9c), complete hot air preheater (11) air inlet is communicated with inlet air of boiler (A0), the air outlet of complete hot air preheater (11) and the combustion air of waste heat air preheater (4) The import of air inlet A1 communicates.

3. the full ingredient improvement of boiler exhaust gas and resource utilization mode as claimed in claim 2 based on waste heat driving, special Sign is the internal multistage washing condensation film decontamination apparatus of step condensation film decontamination module (9), from bottom to top according to Secondary includes following condensation washing, purifying technical process and device: washing condensation rain belt (9j), direction rectifier (9i), partition condensation Device (9h), lower washing heat exchanger (9g), circulating sprayer (9f), washing demister (9e), upper washing heat exchanger (9d), washing Spray equipment (9c), demister (9b), disappear white heat exchanger (9a), the top air side for the white heat exchanger (9a) that disappears and step condensed water The tower top outlet flue of film decontamination module (9) communicates.

4. the full ingredient improvement of boiler exhaust gas and resource utilization mode as claimed in claim 2 based on waste heat driving, special Sign is that the hot precipitator (2) uses the sack cleaner structure of basalt filtering material.

5. the full ingredient improvement of boiler exhaust gas and resource utilization mode as claimed in claim 2 based on waste heat driving, special Sign is that the complete hot air preheater (11) is sprayed using with the direct contact type for carrying out heating and moistening function to boiler auxiliary combustion wind Leaching heat exchange tower structure.

6. the full ingredient improvement of boiler exhaust gas and resource utilization mode as claimed in claim 2 based on waste heat driving, special Sign is the medium temperature flue gas heating surface (1a), middle low-temperature flue gas heating surface (1b), waste heat air preheater (4), middle-temperature section flue gas Heat regenerator (6), the white heat exchanger (9a) that disappears, partition condenser (9h) are changed using the extrusion forming aluminum fin-stock of overcoating grapheme material Heat pipe structure.

7. the full ingredient improvement of boiler exhaust gas and resource utilization mode as claimed in claim 2 based on waste heat driving, special Sign is cold precipitator in routine (2d) to be arranged, wherein low temperature in routine if being not provided with the hot precipitator (2) The gas inlet of deduster (2d) is communicated with the exhanst gas outlet of boiler (2), in routine the exhanst gas outlet of cold precipitator (2d) with The gas inlet of desulfurizing tower (7) or middle-temperature section flue gas heat recovery device (6) communicates.

8. the full ingredient improvement of boiler exhaust gas and resource utilization mode as claimed in claim 2 based on waste heat driving, special Sign is if being not provided with the desulfurizing tower (7) of the wet desulphurization, but furnace high-temperature dry method or semi-dry desulphurization dress is arranged It sets, then the circulating water outlet of buffer pool (7a) is changed to the water inlet communicated with the outlet pipe of moisturizing (B), the desulfurization of buffer pool (7a) The discharge outlet of waste water (P1) still be changed to carry out sewage zero-discharge to the outer draining of a part for carrying out self-water replenishing (B) and salt divided to crystallize function The desulfurization wastewater waste heat evaporation of energy divides the feed inlet in the Wastewater Pretreatment pond (8a) of salt crystallization module (8) to communicate.

9. the full ingredient improvement of boiler exhaust gas and resource utilization mode as claimed in claim 2 based on waste heat driving, special Sign is that the lower washing heat exchanger (9g), upper washing heat exchanger (9d) are all made of strong alkali-acid resistance corrosion and resistance to fouling dirt is stifled Type condensing heat-exchange material.

10. the full ingredient improvement of boiler exhaust gas and resource utilization mode as claimed in claim 2 based on waste heat driving, special Sign is that import washing solution (Na) of the showering washing device (9c) uses pH value dilute molten for 7~10 sodium hydroxide Liquid.