CN107875853A - A kind of coal-burning power plant environmental protection island system and method for cooperateing with zero-emission desulfurization wastewater - Google Patents

A kind of coal-burning power plant environmental protection island system and method for cooperateing with zero-emission desulfurization wastewater Download PDF

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Publication number
CN107875853A
CN107875853A CN201711298897.0A CN201711298897A CN107875853A CN 107875853 A CN107875853 A CN 107875853A CN 201711298897 A CN201711298897 A CN 201711298897A CN 107875853 A CN107875853 A CN 107875853A
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China
Prior art keywords
desulfurization wastewater
urea
water
flue gas
concentrated water
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Inventor
郭士义
张宗和
邓云天
辛景宏
周丽雯
叶紫青
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SEC-IHI POWER GENERATION ENVIRONMENT PROTECTION ENGINEERING Co Ltd
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SEC-IHI POWER GENERATION ENVIRONMENT PROTECTION ENGINEERING Co Ltd
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Priority to CN201711298897.0A priority Critical patent/CN107875853A/en
Publication of CN107875853A publication Critical patent/CN107875853A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8665—Removing heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/60—Heavy metals or heavy metal compounds
    • B01D2257/602—Mercury or mercury compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents

Abstract

The invention discloses a kind of coal-burning power plant environmental protection island system for cooperateing with zero-emission desulfurization wastewater, including the ultra-clean exhaust system of flue gas and desulfurization wastewater zero-emission system, the ultra-clean exhaust system of the flue gas comprises at least Benitration reactor, electric cleaner and wet desulphurization absorption tower, is connected between device by flue；The desulfurization wastewater zero-emission system comprises at least desulfurization wastewater pretreatment and film upgrading unit, concentrated water solvent reclaiming unit and concentrated water solute recovery unit.Present invention also offers a kind of method for cooperateing with zero-emission desulfurization wastewater.The present invention melts the zero-emission of waste water and the purification of flue gas in one, desulfurization wastewater is preprocessed and the processing of film upgrading unit after, the solvent of concentrated water is able to reuse in denitrating system urea dissolution zone, the solute of concentrated water is separated out in urea pyrolysis stove and reclaimed with flue gas in the dust arrester of downstream, save denitrating system water consume, realize collaboration zero-emission desulfurization wastewater, make the system have concurrently energy-conservation, emission reduction, lower consumption the characteristics of.

Description

A kind of coal-burning power plant environmental protection island system and method for cooperateing with zero-emission desulfurization wastewater
Technical field
The present invention relates to coal-burning power plant pollutant comprehensive regulation field, and in particular to a kind of combustion for cooperateing with zero-emission desulfurization wastewater Coal-fired plant's environmental protection island system and method.
Background technology
With《Prevention and control of air pollution action plan》(" ten, air ") and《The energy-saving and emission-reduction of coal electricity upgrade and transformation action meter Draw (2014-2020)》Successive issue, to the year two thousand twenty, all coal-burning power plants for possessing transformation condition in the whole nation strive realizing super Low emission, i.e., under the conditions of benchmark oxygen content 6%, flue dust, sulfur dioxide, discharged nitrous oxides concentration are respectively no higher than 5,35, 50 milligrams/cubic metre, for the minimum discharge requirement of above-mentioned pollutant, coal-burning power plant is configured with environmentally friendly island system after stove, main To include with SCR methods denitration (from the angle of safety in production, the preparation of reducing agent uses urea pyrolysis method more), wet desulphurization With the flue gas purification system based on electric dust-removing equipment.What then on April 16th, 2015, State Council printed and distributed《Water pollution action meter Draw》Clearly proposed in (" ten, water "), to the year two thousand twenty, National Water Environmental quality obtains interim improvement, seriously polluted water body compared with It is greatly reduced, " taking charge of industrial pollution severely prevents " turns into vital task.Coal fired power generation industry belongs to one of five big high water usage industries, From economical operation and environmental protection, generating water is saved, realizes that coal-burning power plant's waste water zero emission is significant.
In existing environmentally friendly island system, flue gas desulfurization most generally using Limestone-gypsum Wet Flue Gas Desulfurization Process technology, its With technology maturation, desulfuration efficiency is high, the advantage such as wide that is applicable coal, but the technology can be produced during utilization it is a certain amount of de- Sulphur waste water.Desulfurization wastewater has that variation water quality scope is big, complicated component, salt content height (Cl-、SO4 2-Deng), suspension content it is high, The characteristics of corrosivity is strong, intractability is significantly increased, therefore realize that the zero-emission of desulfurization wastewater turns into and realize that full factory gives up The key of water zero discharge.
The most commonly used desulfuration waste water treatment process of domestic application mainly uses chemical precipitation method at present, but the method can not The chlorion and fluorine ion of dissolving are effectively removed, therefore the waste water after processing can not recycle, and can not meet full factory's waste water " zero The environmental requirement of discharge "；There is also problem urgently to be resolved hurrily for flue spray-on process in development：Disposal ability is very low, not The desulfurization wastewater of evaporation can corrode flue, and the dirt that the desulfurization wastewater of evaporation is formed is difficult cleaning, flue blockage is easily caused, if not Desulfurization wastewater is pre-processed, easy plug nozzle.Evaporative crystallization method can be separated the salt in waste water, but can not Different price salt is separated, and it is higher to invest operating cost；Membrane concentration method can effectively utilize caused fresh water, but concentrated The harmlessness disposing problems demand of concentrated water caused by journey solves.
The content of the invention
In view of the drawbacks described above of prior art, the invention provides a kind of coal-burning power plant's ring for cooperateing with zero-emission desulfurization wastewater Protect island system and a kind of method for cooperateing with zero-emission desulfurization wastewater.Concrete technical scheme is as follows：
The present invention provides a kind of coal-burning power plant environmental protection island system for cooperateing with zero-emission desulfurization wastewater in first aspect, and it includes The ultra-clean exhaust system of flue gas and desulfurization wastewater zero-emission system, the ultra-clean exhaust system of flue gas comprise at least Benitration reactor, electric precipitation Device and wet desulphurization absorption tower, it is connected by flue between device；Desulfurization wastewater zero-emission system is located in advance including at least desulfurization wastewater Reason and film upgrading unit, concentrated water solvent reclaiming unit and concentrated water solute recovery unit.
In preferred embodiment, the above-mentioned ultra-clean exhaust system of flue gas includes coal-burning boiler, Benitration reactor, air preheat Device, gas cooler, electric cleaner, air-introduced machine, wet desulphurization absorption tower, smoke re-heater and chimney, lead to successively between device Flue is crossed to be connected.
In preferred embodiment, the desulfurization wastewater pretreatment of above-mentioned desulfurization wastewater zero-emission system and film upgrading unit at least wrap Include preliminary sedimentation tank, the neutralization-header of reaction-flocculation three, depositing reservoir, sludge treatment device, super/micro-filtration, high pressure reverse osmosis unit, Fresh water process water tank, supporting waste water delivery pump, high-pressure circulation pump and cleaning pump.
Preferably, above-mentioned neutralization-header of reaction-flocculation three is provided with medicament addition device：Neutralize except hard case is provided with NaOH and Na2CO3Throwing device；Reaction chamber is provided with organic sulfur and flocculating agent feeding device；Flocculation tanks are provided with flocculant and helped Solidifying agent throwing device.
Preferably, above-mentioned high pressure reverse osmosis unit is in series by two sections of Special high-voltage reverse osmosis membrane assemblies, first paragraph film Post uses ductwork type high pressure reverse osmosis membrane assembly-STRO, and second segment film post uses dish tubular type high pressure reverse osmosis membrane assembly-DTRO, Use cross-flow filtration form.
Preferably, the operating pressure scope of above-mentioned high pressure reverse osmosis unit is 70bar~80bar, and salt rejection rate scope is 96%~98%, rate of recovery scope is 60%~70%, the TDS contents of fresh water<2000mg/L, the TDS content ranges of concentrated water are 100000mg/L~130000mg/L.
Preferably, above-mentioned fresh water process water tank is used for the fresh water for collecting high pressure reverse osmosis unit, and is delivered to through fresh water pump The consumption region of plant area's process water.
In preferred embodiment, the concentrated water solvent reclaiming unit of above-mentioned desulfurization wastewater zero-emission system comprises at least concentrated water technique Water tank, urea dissolving tank, urea liquid storage tank and urea liquid high-speed circulating module.
Preferably, above-mentioned concentrated water technique water tank, urea dissolving tank, urea liquid storage tank and urea liquid high-speed circulating module It is connected by stainless steel pipes, the transmission of urea liquid is realized using urea liquid delivery pump and urea liquid circulating pump.
Preferably, above-mentioned concentrated water technique water tank is used for the concentrated water for collecting high pressure reverse osmosis unit, and is delivered to through concentrated water pump The urea dissolving tank in denitration urea area, the solvent of concentrated water are used for the dissolving of urea granules.
Preferably, the ratio between the volume of above-mentioned concentrated water technique water tank and the volume of urea dissolving tank are 2：1~5：1.
Preferably, it is 5 that the concentrated water yield of above-mentioned high pressure reverse osmosis unit dissolves the ratio between water consumption with urea：1~2：1.
In preferred embodiment, the concentrated water solute recovery unit of above-mentioned desulfurization wastewater zero-emission system comprises at least urea liquid Injector, urea pyrolysis stove and downstream dust arrester collect ash bucket.
Preferably, above-mentioned urea liquid injector uses stainless steel, and urea woven hose takes Insulation, reasonable Injection flow and preferably under the premise of atomizing effect, urea liquid injector has anti-clogging, the feature of anti-urea crystals, its Pore diameter range is 0.1mm~0.2mm.
Preferably, above-mentioned urea pyrolysis stove uses stainless steel, makes its tool by the transformation to urea pyrolysis stove configuration There is anticlogging feature, ensure urea while abundant pyrolysis, the solute of concentrated water separates out and with flue gas in urea pyrolysis stove Reclaimed in the dust arrester of downstream.
The present invention additionally provides a kind of method for cooperateing with zero-emission desulfurization wastewater on the other hand, and this method includes following step Suddenly：
Step 1, utilize the ultra-clean exhaust system of flue gas：
Step 1.1, after flue gas caused by coal-burning boiler is mixed with the reducing agent ammonia that urea pyrolysis generates in flue, Occurring catalytic reaction in Benitration reactor, the nitrogen oxides in flue gas generates nitrogen and water in the presence of denitrating catalyst, Elemental Mercury in flue gas generates mercury oxide and particulate Hg in the presence of demercuration catalyst；
Step 1.2, the flue gas after step 1.1 processing is set to pass sequentially through air preheater and gas cooler, to flue gas Heat recycled, flue-gas temperature is reduced to below acid dew point；
Step 1.3, the flue gas after step 1.2 processing is entered electric cleaner, particulate matter in flue gas, adsorbed by flue dust SO3, particulate Hg be captured into collect ash bucket；
Step 1.4, the flue gas after step 1.3 processing is set to enter wet desulphurization absorption tower under air-introduced machine effect, to cigarette SO in gas2, mercury oxide, particulate pollutant handled；
Step 1.5, make the flue gas after step 1.4 processing that the temperature of flue gas are promoted into about 80 by smoke re-heater Degree Celsius；
Step 2, utilize desulfurization wastewater zero-emission system：
Step 2.1, desulfurization wastewater is initially entered Wastewater Pretreatment unit, stood in preliminary sedimentation tank most of outstanding to remove Float, desulfurization wastewater is then delivered to by neutralization-header of reaction-flocculation three by delivery pump, adjusts pH value, the drop of desulfurization wastewater The hardness of low desulfurization wastewater and to desulfurization wastewater carry out flocculation reaction；Will be de- after the neutralized-header of reaction-flocculation three processing Sulphur waste water is promoted to depositing reservoir by waste water pump, is separated after further flocculation sediment through the press filtration of sludge press filtration device, filtrate returns just Heavy pond；
Step 2.2, the clear water on depositing reservoir top in step 2.1 added acid for adjusting pH to after 6~9 by film upgrading unit, Concentration is carried out by high pressure reverse osmosis unit using after super/micro-filtration progress filtration treatment, gained fresh water collecting is in light Hydraulic art water tank is simultaneously used for the process water for supplementing plant area, and gained concentrated water is collected in concentrated water technique water tank；
Step 2.3, the concentrated water of concentrated water technique water tank is delivered to urea dissolving tank through waste water pump, the solvent of concentrated water is used to urinate The dissolving of element, urea liquid are pumped into urea liquid storage tank through urea liquid delivery pump, urea liquid storage tank and urea pyrolysis stove it Between set urea liquid high-speed circulating module, carry out the transmission of urea liquid；
Step 2.4, urea liquid sprayed into urea pyrolysis stove to prepare denitrification reducing agent ammonia by urea liquid injector Gas, the solute of concentrated water separate out in urea pyrolysis stove, and with generation ammonia by air shooter through ammonia-spraying grid and boiler smoke Gas is mixed into the ultra-clean exhaust system of flue gas in flue.
Compared with existing coal-burning power plant's environmental protection island system, the present invention has obvious advantage：
1) this environmentally friendly island system melts the zero-emission of desulfurization wastewater and the minimum discharge of flue gas in one, realizes that " aqueous vapor is simultaneously Control ", technological process is simplified, reduces floor space, saves cost of investment.
2) desulfurization wastewater is used for the process water for supplementing plant area through fresh water caused by membrane concentration method, and the solvent of concentrated water is used to take off The dissolving of nitre system urea, saves denitrating system water consume, meets clean manufacturing energy-conservation, emission reduction, the requirement of consumption reduction.
3) special urea liquid injector and urea pyrolysis stove are used, using the heat in urea pyrolysis stove, makes desulfurization The solute of waste water concentrated water is separated out in urea pyrolysis stove and reclaimed with flue gas in the dust arrester of downstream, solves concentrated water Harmlessness disposing problem.
It should be understood that within the scope of the present invention, above-mentioned each technical characteristic of the invention and have in below (eg embodiment) It can be combined with each other between each technical characteristic of body description, so as to form new or preferable technical scheme.As space is limited, exist This no longer tires out one by one states.So every do not depart from the equivalent or modification completed under principles of this disclosure, this hair is both fallen within The scope of bright protection.
Below with reference to accompanying drawing, the invention will be further described, with absolutely prove the purpose of the present invention, technical characteristic and Technique effect.
Brief description of the drawings
Fig. 1 is the technological process for the coal-burning power plant environmental protection island system that zero-emission desulfurization wastewater is cooperateed with preferred embodiment of the present invention Schematic diagram；
Wherein,
The ultra-clean exhaust system B- of A- flue gases is that desulfurization wastewater zero-emission system 1- coal-burning boiler 2- Benitration reactor 3- air is pre- Hot device 4- gas coolers 5- electric cleaners 6- air-introduced machines 7- wet desulphurization absorption tower 8- smoke re-heater 9- chimney 10- preliminary sedimentation tanks 11- is neutralized except hard case 12- reaction chambers 13- flocculation tanks 14- depositing reservoirs 15- surpasses/micro-filtration 16- high pressure reverse osmosis units 17- pipes Net formula high pressure reverse osmosis membrane assembly-STRO membrane stack 18- dish tubular type high pressure reverse osmosis membrane assembly-DTRO membrane stack 19- fresh water process water Case 20- concentrated water technique water tank 21- urea dissolving tank 22- urea liquid storage tank 23- urea liquid high-speed circulating module 24- urea is molten Fluid injector 25- urea pyrolysis stove 26- ammonia-spraying grid 27- sludge press filtration device 28- sludge buckets the first waste water pumps of 29- 30- second The waste water pump 36- of the 6th waste water pump 35- of waste water pump 31- the 3rd waste water pump 32- the 5th waste water pump 34- of the 4th waste water pump 33- the 7th The urea liquid delivery pump 40- of eight waste water pump 37- the first urea liquid delivery pump 38- the second urea liquid delivery pumps 39- the 3rd take off Sulphur slurry dehydrating device.
Embodiment
With reference to embodiment, the present invention is described in detail.Following examples will be helpful to those skilled in the art The present invention is further understood, but the invention is not limited in any way.It should be pointed out that to one of ordinary skill in the art For, it without departing from the inventive concept of the premise, can also make certain adjustments and improvements, come under the protection model of the present invention Enclose.
Embodiment 1
A kind of coal-burning power plant environmental protection island system for cooperateing with zero-emission desulfurization wastewater is present embodiments provided, is mainly surpassed including flue gas Net exhaust system and desulfurization wastewater zero-emission system.As shown in figure 1, the ultra-clean exhaust system of flue gas mainly includes coal-burning boiler 1, collaboration Remove the Benitration reactor 2 of nitrogen oxides and oxidizing simple substance mercury, air preheater 3, gas cooler 4, cooperation-removal flue dust, Electric cleaner 5, air-introduced machine 6, cooperation-removal sulfur dioxide, mercury oxide, particulate pollutant and the nitrogen oxidation of grain mercury and sulfur trioxide Wet desulphurization absorption tower 7, smoke re-heater 8 and the chimney 9 of thing, apparatus above is sequentially connected by flue；Desulfurization wastewater zero-emission System is pre-processed by desulfurization wastewater and film upgrading unit, concentrated water solvent reclaiming unit and concentrated water solute recovery unit form, desulfurization Wastewater Pretreatment and film upgrading unit mainly include preliminary sedimentation tank 10, (11- is neutralized and removed the header 11-12-13 of neutralization-reaction-flocculation three Hard case 12- reaction chamber 13- flocculation tanks), depositing reservoir 14, sludge treatment device 27-28 (27- sludge press filtration device 28- sludge buckets), Super/micro-filtration 15, high pressure reverse osmosis unit 16, fresh water process water tank 19, supporting waste water delivery pump, high-pressure circulation pump and clear Wash pump；Concentrated water solvent reclaiming unit mainly includes concentrated water technique water tank 20, urea dissolving tank 21, urea liquid storage tank 22 and urea Solution high-speed circulating module 23, apparatus above is connected by stainless steel pipes, relies on urea liquid delivery pump and urea liquid to follow Ring pump realizes the transmission of urea liquid；Concentrated water solute recovery unit mainly includes urea liquid injector 24, urea pyrolysis stove 25 Ash bucket is collected with downstream dust arrester.
Neutralization-header of reaction-flocculation three is provided with medicament addition device；Neutralize except hard case 11 is provided with NaOH and Na2CO3 Throwing device；Reaction chamber 12 is provided with organic sulfur and flocculating agent feeding device；Flocculation tanks 13 are provided with flocculant and flocculation aid is thrown Feeder apparatus.
Fresh water process water tank 19 is used for the fresh water for collecting high pressure reverse osmosis unit 16, and is delivered to plant area's technique through fresh water pump The consumption region of water.
Concentrated water technique water tank 20 is used for the concentrated water for collecting high pressure reverse osmosis unit 16, and is delivered to denitration urea through concentrated water pump The urea dissolving tank 21 in area, the solvent of concentrated water are used for the dissolving of urea granules.
High pressure reverse osmosis unit 16 is in series by two sections of Special high-voltage reverse osmosis membrane assemblies, and first paragraph film post uses pipe network Formula high pressure reverse osmosis membrane assembly-STRO 17, second segment film post use dish tubular type high pressure reverse osmosis membrane assembly-DTRO 18, adopted With cross-flow filtration form.
The operating pressure scope of high pressure reverse osmosis unit 16 is 70bar~80bar, and salt rejection rate scope is 96%~98%, Rate of recovery scope is 60%~70%, the TDS contents of fresh water<2000mg/L, the TDS content ranges of concentrated water for 100000mg/L~ 130000mg/L。
The ratio between concentrated water technique water tank volume 20 and the volume of urea dissolving tank 21 are 2：1~5：1, high pressure reverse osmosis unit 16 It is 5 that concentrated water yield dissolves the ratio between water consumption with urea：1~2：1.
Urea liquid injector 24 uses stainless steel, and urea woven hose takes Insulation, in rational injection stream Measure and preferably under the premise of atomizing effect, injector has anti-clogging, the feature of anti-urea crystals, and its pore diameter range is 0.1mm ~0.2mm.
Urea pyrolysis stove 25 uses stainless steel, is made it have by the transformation to urea pyrolysis stove configuration anticlogging Feature, ensure urea while abundant pyrolysis, the solute of concentrated water separates out and with flue gas in downstream dedusting in urea pyrolysis stove Reclaimed in device.
Embodiment 2
A kind of method for cooperateing with zero-emission desulfurization wastewater is present embodiments provided, is comprised the following steps that：
In the ultra-clean exhaust system A of flue gas, flue gas caused by coal-burning boiler 1 and the reducing agent ammonia of urea pyrolysis generation exist After being mixed in flue, enter through the top commutation layer of Benitration reactor 2 and be loaded with the conversion zone of catalyst, the nitrogen oxides in flue gas exists Occur selective catalytic reduction reaction in the presence of denitrating catalyst, generate nitrogen and water, the Elemental Mercury in flue gas is urged in demercuration Oxidation reaction occurs in the presence of agent, generates mercury oxide and particulate Hg；Flue gas passes sequentially through air preheater 3 and flue gas cooling Device 4 is recycled to the heat of flue gas, improves the thermal efficiency of boiler, and flue-gas temperature is dropped to below acid dew point, most of SO3Condensation is adsorbed by flue dust, and flue-gas temperature is reduced to 90 degrees centigrades, makes the ratio resistance of dust in flue gas reduce, Jin Erti The high efficiency of dust collection of downstream electric cleaner 5；After flue gas enters electric cleaner 5, particulate matter in flue gas, by flue dust absorption SO3, particulate Hg be captured into collect ash bucket；Then, flue gas introduces wet desulphurization absorption tower 7 under the effect of air-introduced machine 6, wet In method desulfuration absorbing tower, the SO in flue gas2Absorbed by lime stone slurry, the SO in mercury oxide and slurries in flue gas3 2-After reaction It is dissolved in desulfurization slurry, in addition, the partial particulate pollutant in flue gas can be also washed under the spray effect of lime stone slurry In desulfurization slurry；Finally, flue gas passes through smoke re-heater 8, and flue-gas temperature is promoted to 80 degrees centigrades, avoids flue gas and pass through Gypsum rain phenomenon after the discharge of chimney 9.Pass through the collaboration governance role of each pollutant catabolic gene equipment in above-mentioned ultra-clean exhaust system Minimum discharge can be achieved, i.e., under the conditions of benchmark oxygen content 6%, flue dust, sulfur dioxide, discharged nitrous oxides concentration be not high respectively In 5,35,50 milligrams/cubic metre.
In desulfurization wastewater zero-emission system B, desulfurization wastewater initially enters pretreatment unit, is carried out in preliminary sedimentation tank 10 quiet Put, to remove the most suspended substances in waste water.Waste water is promoted to the header 11- of neutralization-reaction-flocculation three after through delivery pump 12-13, the pH value of desulfurization wastewater is generally below 6.0, in faintly acid, therefore in and except being provided with NaOH and Na on hard case 112CO3Throw Feeder apparatus, for adjusting the pH value of waste water to 9~9.5, reduce the hardness of waste water, Ca2+、Mg2+Can be with other heavy metal ion OH-Or CO3 2-Generate the hydroxide or carbonate deposition of indissoluble；Waste water enters reaction chamber 12 from neutralization except hard case 11 flows automatically, Organic sulfur and flocculant are added in reaction chamber, it is impossible to the residual heavy metal of hydroxide form precipitation with sulfide precipitation Form removes, and the sediment in water is formed the bulky grain flocculate for being easy to sedimentation；The water outlet of reaction chamber 12 enters flocculation tanks 13, Flocculation aid is added in flocculation tanks 13, flocculation reaction is carried out under slow-speed of revolution stirring.Flocculation tanks water outlet is promoted to clear through waste water pump Clear pond 14, waste water flco is further grown up in depositing reservoir 14, and carries out precipitation separation, depositing reservoir bottom mud by top swash plate Slag delivers to sludge press filtration device 27 by sludge delivery pump, completes body refuse press filtration by sludge press filtration device 27, the mud cake after press filtration Sludge bucket 28 is collected in, and is transported outward and disposed by automobile, filtrate then returns to desulfurization wastewater preliminary sedimentation tank.Depositing reservoir top clear water is through acid adding Regulation pH to 6~9 after enter film upgrading unit, the desulfurization wastewater after softening clarifying treatment can still carry substantial amounts of colloid and A small amount of suspension, to ensure that subsequent treatment can be normally carried out, filtration treatment is carried out using super/micro-filtration 15.Through super/micro-filtration Waste water after the processing of device 15 enters high pressure reverse osmosis unit 16, passes through two sections of Special high-voltage reverse osmosis membrane assemblies series connection (first Section film post uses ductwork type high pressure reverse osmosis membrane assembly-STRO 17, and second segment film post uses dish tubular type high pressure reverse osmosis membrane group 18) part-DTRO carries out concentration to waste water, gained fresh water collecting is in fresh water process water tank 19 and is used for the work for supplementing plant area Skill water, gained concentrated water are collected in concentrated water technique water tank 20.The waste water of concentrated water technique water tank 20 is delivered to urea through waste water pump 36 Dissolving tank 21, the solvent of concentrated water are used for the dissolving of urea, and urea liquid is pumped into urea liquid storage tank through urea liquid delivery pump 37 22, urea liquid high-speed circulating module 23 is set between urea liquid storage tank 22 and urea pyrolysis stove 25, urea liquid is molten through urea Fluid injector sprays into urea pyrolysis stove 25 to prepare denitrification reducing agent ammonia, and the solute of concentrated water separates out in urea pyrolysis stove, and The ultra-clean discharge of flue gas is mixed into flue through ammonia-spraying grid 26 and boiler smoke by air shooter with the ammonia of generation is Unite A.
Preferred embodiment of the invention described in detail above.It should be appreciated that the ordinary skill of this area is without wound The property made work can makes many modifications and variations according to the design of the present invention.Therefore, all technician in the art Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea Scheme, all should be in the protection domain being defined in the patent claims.

Claims (10)

  1. A kind of 1. coal-burning power plant environmental protection island system for cooperateing with zero-emission desulfurization wastewater, it is characterised in that coal-burning power plant's environmental protection island System includes the ultra-clean exhaust system of flue gas and desulfurization wastewater zero-emission system, the ultra-clean exhaust system of flue gas include coal-burning boiler, Benitration reactor, air preheater, gas cooler, electric cleaner, air-introduced machine, wet desulphurization absorption tower, smoke re-heater and Chimney, it is connected by flue between device；The desulfurization wastewater zero-emission system comprises at least desulfurization wastewater pretreatment and film concentration Unit, concentrated water solvent reclaiming unit and concentrated water solute recovery unit.
  2. 2. coal-burning power plant's environmental protection island system according to claim 1, it is characterised in that the desulfurization wastewater zero-emission system In, desulfurization wastewater pretreatment and film upgrading unit comprise at least preliminary sedimentation tank, the neutralization-header of reaction-flocculation three, depositing reservoir, Sludge treatment device, super/micro-filtration, high pressure reverse osmosis unit, fresh water process water tank, supporting waste water delivery pump, high pressure are followed Ring pump and cleaning pump.
  3. 3. coal-burning power plant's environmental protection island system according to claim 2, it is characterised in that the neutralization-reaction-flocculation three Case is provided with medicament addition device：Neutralize except hard case is provided with NaOH and Na2CO3Throwing device；Reaction chamber be provided with organic sulfur and Flocculating agent feeding device；Flocculation tanks are provided with flocculant and flocculation aid throwing device.
  4. 4. coal-burning power plant's environmental protection island system according to claim 2, it is characterised in that the high pressure reverse osmosis unit is by two Section Special high-voltage reverse osmosis membrane assembly is in series, and first paragraph film post is using ductwork type high pressure reverse osmosis membrane assembly-STRO, and second Section film post uses dish tubular type high pressure reverse osmosis membrane assembly-DTRO, using cross-flow filtration form；The high pressure reverse osmosis unit Operating pressure scope is 70bar~80bar, and salt rejection rate scope is 96%~98%, and rate of recovery scope is 60%~70%, fresh water TDS contents<2000mg/L, the TDS content ranges of concentrated water are 100000mg/L~130000mg/L.
  5. 5. coal-burning power plant's environmental protection island system according to claim 2, it is characterised in that the fresh water process water tank is used to receive Collect the fresh water of the high pressure reverse osmosis unit, and the consumption region of plant area's process water is delivered to through fresh water pump.
  6. 6. coal-burning power plant's environmental protection island system according to claim 1, it is characterised in that the desulfurization wastewater zero-emission system In, the concentrated water solvent reclaiming unit comprises at least concentrated water technique water tank, urea dissolving tank, urea liquid storage tank and urea liquid High-speed circulating module；The concentrated water technique water tank, the urea dissolving tank, the urea liquid storage tank and the urea liquid are high Fast loop module is connected by stainless steel pipes, and urea liquid is realized using urea liquid delivery pump and urea liquid circulating pump Transmission；The concentrated water technique water tank is used for the concentrated water for collecting high pressure reverse osmosis unit, and is delivered to denitration urea area through concentrated water pump The urea dissolving tank, the solvent of the concentrated water is used for the dissolving of urea granules.
  7. 7. coal-burning power plant's environmental protection island system according to claim 6, it is characterised in that the volume of the concentrated water technique water tank It is 2 with the ratio between the volume of the urea dissolving tank：1~5：1.
  8. 8. coal-burning power plant's environmental protection island system according to claim 6, it is characterised in that the high pressure reverse osmosis unit it is dense It is 5 that aquatic products amount dissolves the ratio between water consumption with urea：1~2：1.
  9. 9. coal-burning power plant's environmental protection island system according to claim 1, it is characterised in that the desulfurization wastewater zero-emission system In, the concentrated water solute recovery unit comprises at least urea liquid injector, urea pyrolysis stove and downstream dust arrester and collects ash Bucket.
  10. A kind of 10. method for cooperateing with zero-emission desulfurization wastewater, it is characterised in that the described method comprises the following steps：
    Step 1, utilize the ultra-clean exhaust system of flue gas：
    Step 1.1, after flue gas caused by coal-burning boiler is mixed with the reducing agent ammonia that urea pyrolysis generates in flue, taking off Occurring catalytic reaction in nitre reactor, the nitrogen oxides in the flue gas generates nitrogen and water in the presence of denitrating catalyst, Elemental Mercury in the flue gas generates mercury oxide and particulate Hg in the presence of demercuration catalyst；
    Step 1.2, the flue gas after step 1.1 processing is set to pass sequentially through air preheater and gas cooler, to the flue gas Heat recycled, the flue-gas temperature is reduced to below acid dew point；
    Step 1.3, the flue gas after step 1.2 processing is entered electric cleaner, particulate matter in the flue gas, adsorbed by flue dust SO3, particulate Hg be captured into collect ash bucket；
    Step 1.4, the flue gas after step 1.3 processing is set to enter wet desulphurization absorption tower under air-introduced machine effect, to the cigarette SO in gas2, mercury oxide, particulate pollutant handled；
    Step 1.5, make the flue gas after step 1.4 processing that the temperature of the flue gas are promoted into about 80 by smoke re-heater Degree Celsius；
    Step 2, utilize desulfurization wastewater zero-emission system：
    Step 2.1, desulfurization wastewater is initially entered Wastewater Pretreatment unit, stood in preliminary sedimentation tank to remove most of suspension Thing, desulfurization wastewater is then delivered to by neutralization-header of reaction-flocculation three by delivery pump, adjust the desulfurization wastewater pH value, Reduce the hardness of the desulfurization wastewater and flocculation reaction is carried out to the desulfurization wastewater；Will be through the neutralization-reaction-flocculation three Desulfurization wastewater after header processing is promoted to depositing reservoir by waste water pump, divides after further flocculation sediment through the press filtration of sludge press filtration device From filtrate returns to the preliminary sedimentation tank；
    Step 2.2, the clear water of depositing reservoir top described in step 2.1 added acid for adjusting pH to after 6~9 by film upgrading unit, Concentration is carried out by high pressure reverse osmosis unit using after super/micro-filtration progress filtration treatment, gained fresh water collecting is in light Hydraulic art water tank is simultaneously used for the process water for supplementing plant area, and gained concentrated water is collected in concentrated water technique water tank；
    Step 2.3, the concentrated water of the concentrated water technique water tank is delivered to urea dissolving tank through waste water pump, the concentrated water it is molten Agent is used for the dissolving of urea, and urea liquid is pumped into urea liquid storage tank through urea liquid delivery pump, the urea liquid storage tank with Urea liquid high-speed circulating module is set between urea pyrolysis stove, carries out the transmission of urea liquid；
    Step 2.4, the urea liquid sprayed into urea pyrolysis stove to prepare denitrification reducing agent ammonia by urea liquid injector Gas, the solute of concentrated water separate out in the urea pyrolysis stove, and with generation ammonia by air shooter through ammonia-spraying grid and pot Kiln gas is mixed into the ultra-clean exhaust system of the flue gas in the flue.
CN201711298897.0A 2017-12-08 2017-12-08 A kind of coal-burning power plant environmental protection island system and method for cooperateing with zero-emission desulfurization wastewater Pending CN107875853A (en)

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CN108529808A (en) * 2018-06-14 2018-09-14 南京东大能源工程设计院有限公司 A kind of desulfurization wastewater treatment system and technique
CN110433595A (en) * 2018-05-04 2019-11-12 李春霞 A kind of multi-functional waste gas purification agent set and its system
CN115364645A (en) * 2022-08-01 2022-11-22 巩义市良慧环保科技有限公司 Molecular membrane method flue gas desulfurization and decarburization system and desulfurization and decarburization method thereof

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CN105967420A (en) * 2016-06-17 2016-09-28 国网河南省电力公司电力科学研究院 Synergistic gas-liquid-solid pollutant treatment system based on power plant wastewater zero-discharge technology
CN106315915A (en) * 2016-09-13 2017-01-11 上海电气电站环保工程有限公司 Zero-emission and salt-separation desulphurization wastewater treatment system

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CN105967420A (en) * 2016-06-17 2016-09-28 国网河南省电力公司电力科学研究院 Synergistic gas-liquid-solid pollutant treatment system based on power plant wastewater zero-discharge technology
CN106315915A (en) * 2016-09-13 2017-01-11 上海电气电站环保工程有限公司 Zero-emission and salt-separation desulphurization wastewater treatment system

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CN110433595A (en) * 2018-05-04 2019-11-12 李春霞 A kind of multi-functional waste gas purification agent set and its system
CN110433595B (en) * 2018-05-04 2021-07-13 李春霞 Multifunctional waste gas purification main body device and system thereof
CN108529808A (en) * 2018-06-14 2018-09-14 南京东大能源工程设计院有限公司 A kind of desulfurization wastewater treatment system and technique
CN115364645A (en) * 2022-08-01 2022-11-22 巩义市良慧环保科技有限公司 Molecular membrane method flue gas desulfurization and decarburization system and desulfurization and decarburization method thereof

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