CN112090255A - Mobile coal-fired startup boiler multi-pollutant collaborative removal system and method - Google Patents

Mobile coal-fired startup boiler multi-pollutant collaborative removal system and method Download PDF

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Publication number
CN112090255A
CN112090255A CN202011078907.1A CN202011078907A CN112090255A CN 112090255 A CN112090255 A CN 112090255A CN 202011078907 A CN202011078907 A CN 202011078907A CN 112090255 A CN112090255 A CN 112090255A
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flue gas
flue
water film
dust collector
cyclone water
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王路松
郭江龙
樊孝华
焦世超
王哲
杨帆
张爱存
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Hebei Ji Yan Energy Science And Technology Research Institute Co ltd
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Hebei Ji Yan Energy Science And Technology Research Institute Co ltd
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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
    • B01D53/75—Multi-step processes
    • 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
    • B01D53/346—Controlling the process
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • 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
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • 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
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/104—Ozone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/10—Nitrogen; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/40—Intercepting solids by cyclones
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/50—Intercepting solids by cleaning fluids (washers or scrubbers)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/40—Sorption with wet devices, e.g. scrubbers

Abstract

The invention discloses a system and a method for removing multiple pollutants of a movable coal-fired start boiler in a coordinated manner, wherein the systemComprises a coal-fired starting boiler, a flue gas recirculation flue, a cyclone water film dust removal system, a draught fan, an ozone denitration system and a combined SO removal system2/NOXThe system, the wet electrostatic precipitator and the chimney; the cyclone water film dedusting system comprises a cyclone water film deduster, a sedimentation tank and a clarification tank, and the ozone denitration system comprises a sodium-calcium double-alkali desulfurization tower, an ozone generator and an ozone ejector; the method for cooperatively removing the pollutants comprises the steps of dust removal, denitration, desulfurization and dust removal again. The system equipment has the characteristics of stable operation, small influence by operation parameters, small engineering investment scale, low construction difficulty, less power consumption equipment, mobility and high utilization rate.

Description

Mobile coal-fired startup boiler multi-pollutant collaborative removal system and method
Technical Field
The invention relates to the technical field of industrial waste gas and waste water purification, in particular to a system and a method for removing multiple pollutants in a coal-fired starting boiler in a coordinated manner.
Background
The coal-fired starting boiler is an indispensable auxiliary equipment of a large-scale thermal power plant, is the only steam source for supplying steam to the auxiliary steam system when a first unit of the power plant is started in a cold state, and directly influences the safe starting of a main engine. Compared with a large thermal power generation boiler, the coal-fired starting boiler mostly adopts a chain boiler and has the characteristics of low hearth flame temperature, small boiler capacity, low operation parameters and short operation time. However, coal-fired starting boilers occupy large area and exceed standard pollutant discharge, so many power plants plan to eliminate the coal-fired starting boilers.
The electrostatic dust removal technology is the most widely applied technology for removing dust from flue gas of large-scale thermal power generation boilers at present, the dust removal technology requires that the temperature of the flue gas cannot be too low, otherwise, the problems of condensation, creepage and ash blockage of an insulating part and the like are easily caused, and therefore, the electrostatic dust remover cannot be put into operation in the starting stage of the boiler. In addition, the electrostatic dust collector also has the defects of large investment scale, large operation power consumption, high equipment failure rate and the like.
The Selective Catalytic Reduction (SCR) technology is the most widely applied technology for flue gas denitration of large-scale thermal power generation boilers at present, the denitration efficiency of the denitration technology can reach 90 percent at most, the denitration technology is the most mature and reliable denitration technology, the reaction temperature is required to be 300-400 ℃, and in addition, a catalyst of the technology is easy to inactivate under the actions of dust deposition and abrasion.
The limestone-gypsum wet desulphurization technology is the most widely applied technology for flue gas desulphurization of the large-scale thermal power generation boiler at present, the technology process is mature, the desulphurization efficiency can reach 99 percent at most, but the desulphurization waste water generated by the technology is difficult to treat. Therefore, a system and method for removing multiple pollutants is needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a system and a method for cooperatively removing various pollutants of a movable coal-fired start boiler, so as to solve the problems that a catalyst is easy to inactivate in a selective catalytic reduction denitration technology and wastewater treatment is difficult in a limestone-gypsum wet desulphurization technology, and achieve the purpose of ensuring qualified emission of flue gas of each power plant boiler.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A movable type coal-fired starting boiler multi-pollutant collaborative removal system comprises a coal-fired starting boiler, a flue gas recirculation flue, a cyclone water film dust removal system, an induced draft fan, an ozone denitration system and a combined removal SO system, wherein the coal-fired starting boiler, the flue gas recirculation flue, the cyclone water film dust removal system, the induced draft fan, the ozone denitration system and the combined removal SO system are adjusted through a PLC (programmable logic controller) automatic2/NOXThe system, the wet electrostatic precipitator and the chimney; the cyclone water film dust removal system comprises a cyclone water film dust remover, a sedimentation tank communicated with the bottom end of the cyclone water film dust remover, and a clarification tank respectively communicated with the sedimentation tank and the top end of the cyclone water film dust remover; the ozone denitration system comprises a sodium-calcium double-alkali desulfurization tower, and an ozone generator and an ozone ejector which are matched for use; the top of the coal-fired starting boiler is connected with the lower part of a cyclone water film dust collector through a flue, and the cyclone water film dust collector is connected with an induced draft fan through an inverted U-shaped outlet flue; the induced draft fan is communicated with a sodium-calcium double-alkali desulfurization tower of which the top is provided with a wet electrostatic dust collector through a flue, and the tail end of the wet electrostatic dust collector is connected with a chimney through the flue; the injection end of the ozone injector extends into a flue between an induced draft fan and the sodium-calcium double-alkali desulfurization towerAnd a flue between the ozone injector and the induced draft fan is communicated with a flue gas recirculation flue, and the other end of the flue gas recirculation flue is communicated with a secondary air box.
According to the technical scheme, the cyclone water film dust collector is of a cylindrical structure, and the height of the cylinder is 6-10 times of the diameter of the cylinder.
According to the technical scheme, a dust concentration measuring instrument for testing the dust concentration and the concentration of the drained water of the spray water is arranged at the outlet of the cyclone water film dust collector; a flue gas adjusting baffle is arranged at a flue gas inlet of the cyclone water film dust collector; the inlet flue of the cyclone water film dust collector is provided with a flow guide plate with an adjustable angle.
Further optimizing the technical scheme, and the combined removal of SO2/NOXThe system comprises a sodium-calcium dual-alkali desulfurization tower, wherein the lower part of the sodium-calcium dual-alkali desulfurization tower is communicated with a first circulating water pump, the first circulating water pump is sequentially connected with a reaction tank, a combined sedimentation tank, a circulating tank and a second circulating water pump, and the second circulating water pump is connected with the upper part of the sodium-calcium dual-alkali desulfurization tower.
According to the further optimized technical scheme, the flue gas recirculation flue is provided with a flue gas recirculation regulating valve used for controlling the flue gas recirculation ratio to be 10% -15%, and the flue gas recirculation flue, the flue and the secondary air box are in flexible connection.
According to the technical scheme, the bottom end of the coal-fired starting boiler is communicated with a primary air box, and all devices in the pollutant collaborative removal system are adjusted through a PLC (programmable logic controller) automatic control system and software.
The invention also provides a removal method of the movable coal-fired start-up boiler multi-pollutant collaborative removal system, wherein flue gas enters a cyclone water film dust collector to flow in a reverse direction with water mist for dust removal, ozone sprayed by an ozone sprayer is fully mixed with the flue gas for denitration, and then is desulfurized through a sodium-calcium double-alkali desulfurization tower, and finally is dedusted by a wet electrostatic precipitator; and when the coal-fired starting boiler is stable in combustion, opening the flue gas recirculation regulating valve to regulate the flow of the flue gas.
The technical scheme is further optimized, the opening degree of a flue gas adjusting baffle plate at the flue gas inlet of the cyclone water film dust collector is adjusted according to the change of the flue gas amount in the starting process, and the flue gas entering the cyclone water film dust collector is ensured to have the initial speed of 20 m/s; the angle of the inlet guide plate of the cyclone water film dust collector is adjusted, so that the flue gas has the maximum circumferential speed along the cyclone water film dust collector under different flue gas flow rates.
Further optimizing the technical scheme, and controlling the regeneration amount of the slurry in the reaction tank during desulfurization to ensure that the pH value of the slurry is within 7-8; and reasonably selecting the slurry spraying flow of the circulating water pump, and controlling the liquid-gas ratio within the range of 2.5-2.6L/m 3.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
The invention provides a mobile coal-fired starting boiler multi-pollutant collaborative removal system and a control method, which can ensure that pollutants such as dust, nitric oxide, sulfur dioxide and the like in flue gas can be stably and efficiently removed in the whole period of the starting process of each power plant boiler, the standard emission of the flue gas is realized, the instantaneous standard exceeding emission of the flue gas pollutants is avoided, and meanwhile, the desulfurization wastewater of the power plant boiler can be effectively treated. In addition, the system equipment also has the characteristics of stable operation, small influence by operation parameters, small engineering investment scale, low construction difficulty, less power consumption equipment, mobility and high utilization rate.
Drawings
FIG. 1 is a schematic structural diagram of a system for the synergistic removal of multiple pollutants from a mobile coal-fired start-up boiler according to the present invention;
FIG. 2 is a schematic structural diagram of a cyclone water film dedusting system of the present invention;
FIG. 3 shows the combined SO removal according to the present invention2/NOXThe structural schematic diagram of the system of (1);
wherein: 1. the system comprises a primary air box, 2, a secondary air box, 3, a coal-fired start-up boiler, 4, a flue gas recirculation flue, 5, a cyclone water film dust collector, 6, a draught fan, 7, an ozone generator, 8, an ozone injector, 9, a sodium-calcium dual-alkali desulfurization tower, 10, a wet electrostatic dust collector, 11, a chimney, 12, a clarification tank, 13, a sedimentation tank, 14, a flue gas recirculation regulating valve, 15, a first circulation water pump, 16, a reaction tank, 17, a combined sedimentation tank, 18, a circulation tank, 19 and a second circulation water pump.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific examples.
A movable type coal-fired starting boiler multi-pollutant collaborative removal system is characterized in that all devices in the system are adjusted through a PLC (programmable logic controller) automatic control system and software, and shown in a combined view in figures 1 to 3, and comprises a coal-fired starting boiler 3 with a primary air box 1 communicated at the bottom end, a flue gas recirculation flue 4, a cyclone water film dust removal system, an induced draft fan 6, an ozone denitration system and a combined SO removal system2/NOXA wet electrostatic precipitator 10, a chimney 11.
The cyclone water film dust removal system comprises a cyclone water film dust remover 5, a sedimentation tank 13 and a clarification tank 12. The sedimentation tank 13 is communicated with the bottom end of the cyclone water film dust collector 5 through a pipeline, the outlet of the sedimentation tank 13 is communicated with the clarification tank 12, and the outlet of the clarification tank 12 is communicated with the top end of the cyclone water film dust collector 5.
The cyclone water film dust collector 5 is of a cylindrical structure, and the height of the cylinder body is 6-10 times of the diameter of the cylinder body. The cyclone water film dust collector 5 has lower requirement on the operating environment, can be put into operation at the initial fuel oil stage of starting, realizes the removal of pollutants in the whole starting period, and in addition, the main body of the device is built by granite, has the characteristics of abrasion resistance and corrosion resistance, has lower requirement on the water quality of water required for dust removal, and can adopt the wastewater discharged by the sodium-calcium double-alkali desulfurization tower 9 system to remove dust. The water is sprayed to the inner wall of the cylinder from the nozzle at the upper part of the cylinder of the cyclone water film dust remover 5 along the tangential direction, a layer of water film is formed on the inner surface of the cylinder of the cyclone water film dust remover 5, the waste water containing smoke dust is discharged from the central discharge pipe at the bottom of the dust remover, enters the sedimentation tank 13 and the clarification tank 12, is separated and cooled step by step, and then is sent into the dust remover for closed cycle use. A dust concentration measuring instrument is arranged at the outlet of the cyclone water film dust collector 5 and used for testing the dust concentration and the drainage concentration of spray water; a flue gas adjusting baffle is arranged at a flue gas inlet of the cyclone water film dust collector 5; the inlet flue of the cyclone water film dust collector 5 is provided with a flow guide plate with an adjustable angle. The dust removal efficiency of the cyclone water film dust remover 5 can reach 90 percent at most, the water used by the dust remover is recycled, a part of desulfurization waste water is consumed, and the treatment cost of the desulfurization waste water can be reduced.
The ozone denitration system comprises a sodium-calcium double-alkali desulfurization tower 9, an ozone generator 7 and an ozone ejector 8 which are matched for use. The sodium-calcium double-alkali desulfurizing tower 9 adopts NaOH solution to absorb SO in the flue gas2And the reacted desulfurizer is regenerated by lime slurry and then returned to the sodium-calcium double-alkali desulfurization tower 9 for recycling. The ozone generator 7 produces ozone by high-concentration oxygen conveyed by the ionized liquid oxygen storage tank, and NO in the ozone oxidation flue gas generates high-valence NOxThen absorbing high valence NO by alkali liquorxThe reaction rate is accelerated, and the NO concentration in the smoke is further reduced. The ozone denitration system is provided with an independent PLC control system, an instrument of a raw material gas source system and an oxidant preparation system are controlled and brought into the denitration PLC control system, the liquid oxygen flow entering the ozone generator 7 is set as a feed-forward signal according to the raw gas amount and the concentration of NOx in the raw gas, the liquid oxygen flow entering the ozone generator 7 is adjusted as a feedback signal according to the concentration of NOx at the outlet of the sodium-calcium double-alkali desulfurization tower 9, and equipment in an oxidant preparation area is monitored through an original operation station.
The top of the coal-fired starting boiler 3 is connected with the lower part of a cyclone water film device 5 through a flue, and the cyclone water film dust remover 5 is connected with an induced draft fan 6 through an inverted U-shaped outlet flue; the induced draft fan 6 is communicated with a sodium-calcium double-alkali method desulfurizing tower 9 through a flue, a wet electrostatic dust collector 10 is arranged at the top of the sodium-calcium double-alkali method desulfurizing tower 9, and the tail end of the wet electrostatic dust collector 10 is connected with a chimney 11 through the flue. The spraying end of the ozone ejector 8 extends into a flue between the induced draft fan 6 and the sodium-calcium dual-alkali desulfurization tower 9, the nozzle of the ozone ejector 8 is arranged facing the incoming flow direction of the flue gas, and the distance between the installation position of the ozone ejector 8 and the sodium-calcium dual-alkali desulfurization tower 9 can ensure that the ozone and NO in the flue gas are separated byxThe flue between the ozone injector 8 and the induced draft fan 6 is communicated with a flue gas recirculation flue 4, and the other end of the flue gas recirculation flue 4 is communicated with a secondary air box 2. The flue gas recirculation flue 4 is provided with a flue gas recirculation regulating valve 14 for controlling the flue gas recirculation ratio to be 10-15% so that the carbon content of ash and the nitrogen oxide are generatedThe amount reaches the most economical optimum; the flue gas recirculation flue 4 is flexibly connected with the flue and the secondary air box 2, and the secondary air box 2 on the rear wall of the hearth moves upwards by 0.5m, so that the flue gas forms S-shaped flow at the outlet of the furnace arch, the disturbance of the flue gas in the furnace is strengthened, the combustion is strengthened, the retention time of the flue gas in the furnace is prolonged, and the carbon black which is not fully burnt out is further combusted due to the radiation of high-temperature radiation heat; in addition, in turbulent flow, larger dust falls down to be burnt out in the furnace; after the flue gas recirculation technology is adopted, the denitration efficiency can reach 25% at most.
Combined removal of SO2/NOXThe system comprises a sodium-calcium double-alkali desulfurization tower 9, wherein the lower part of the sodium-calcium double-alkali desulfurization tower 9 is communicated with a first circulating water pump 15, the first circulating water pump 15 is sequentially connected with a reaction tank 16, a combined sedimentation tank 17, a circulating tank 18 and a second circulating water pump 19, and the second circulating water pump 19 is connected with the upper part of the sodium-calcium double-alkali desulfurization tower 9.
A removal method of a mobile coal-fired startup boiler multi-pollutant collaborative removal system is as follows.
The primary air box 1 accelerates the flow of flue gas in the coal-fired starting boiler 3, the flue gas enters the cyclone water film dust collector 5 to be dedusted in a reverse flow mode with water mist, the opening degree of a flue gas inlet flue gas adjusting baffle of the cyclone water film dust collector 5 is adjusted according to the change of the flue gas amount in the starting process, the flue gas entering the cyclone water film dust collector 5 has the initial speed of 20m/s, and dust particles in the flue gas enter a water film under the action of centrifugal force. The angle of the inlet guide plate of the cyclone water film dust collector 5 is adjusted, so that the flue gas has the maximum circumferential speed along the cyclone water film dust collector 5 under different flue gas flow rates. The dust concentration measuring instrument arranged at the outlet of the cyclone water film dust collector 5 measures the drainage concentration of the spray water and adjusts the flow of the spray water according to the dust concentration at the outlet of the cyclone water film dust collector 5 and the drainage concentration of the spray water.
Using proper pipe diameter of the branch pipe of the ozone injector 8 to ensure that the flue gas and the ozone injected into the flue by the ozone injector 8 are fully mixed for denitration, and the low-valence NO isxBy oxidation to higher NOx(ii) a Controlling the pH value of the slurry in the reaction tank 16 to be 7-8 during desulfurization; reasonably selecting the second circulating water pump 19 slurry spraying flow rate, and controlling the liquid-gas ratio to be 2.5-2.6L/m3. Then the flue gas is desulfurized by a sodium-calcium double-alkali method desulfurizing tower 9, and NO is discharged from the outlet of the sodium-calcium double-alkali method desulfurizing tower 92The NO concentration is matched with the liquid oxygen flow entering the ozone generator 7 and the number of the operation branch pipes, and the SO in the flue gas2And high valence NOxNa in slurry of sodium-calcium double-alkali desulfurization tower 9 along with flue gas2CO3The reaction absorption of NaOH, the reacted slurry is pumped into a reaction tank 16 through a first circulating water pump 15 for regeneration, then is precipitated through a combined precipitation tank 17 and overflows into a circulating tank 18, then is sprayed to a sodium-calcium dual-alkali desulfurization tower 9 through a second circulating water pump 19, and the liquid-gas ratio is controlled to be 2.5-2.6L/m3Within the range, and controlling the pH value of the slurry within 7-8 to avoid SO2Insufficient removal capability or scaling and the like. Finally, the wet electrostatic precipitator 10 removes dust from the flue gas again.
At the initial stage of starting the coal-fired starting boiler 3, the temperature of the hearth is low, the combustion is unstable, and the flue gas recirculation regulating valve 14 needs to be closed to ensure the stable combustion of the pulverized coal. After the coal-fired start-up boiler 3 burns stably, increase flue gas recirculation governing valve 14 again and adjust the flue gas flow for furnace oxygen volume reduces gradually. In addition, in the adjusting process, parameters such as NOx concentration, fly ash carbon content and the like in the smoke at the outlet of the hearth are measured, so that the generation amount of NOx is reduced, and the efficient combustion of the pulverized coal is guaranteed.

Claims (9)

1. The utility model provides a multiple pollutant of portable coal fired start-up boiler is desorption system in coordination which characterized in that: the system comprises a pollutant synergistic removal system, a coal-fired starting boiler (3), a flue gas recirculation flue (4), a cyclone water film dedusting system, a draught fan (6), an ozone denitration system and a combined SO removal system which are regulated by a PLC automatic control system and software2/NOXThe system comprises a wet electrostatic precipitator (10) and a chimney (11); the cyclone water film dust removal system comprises a cyclone water film dust remover (5), a sedimentation tank (13) communicated with the bottom end of the cyclone water film dust remover (5), and a clarification tank (12) respectively communicated with the sedimentation tank (13) and the top end of the cyclone water film dust remover (5); the ozone denitration system comprises a sodium-calcium double-alkali desulfurization tower (9) and an odor used in cooperation with the sodium-calcium double-alkali desulfurization towerAn oxygen generator (7) and an ozone injector (8); the top of the coal-fired starting boiler (3) is connected with the lower part of the cyclone water film dust collector (5) through a flue, and the cyclone water film dust collector (5) is connected with an induced draft fan (6) through an inverted U-shaped outlet flue; the induced draft fan (6) is communicated with a sodium-calcium double-alkali desulfurization tower (9) with a wet electrostatic dust collector (10) arranged at the top through a flue, and the tail end of the wet electrostatic dust collector (10) is connected with a chimney (11) through the flue; the spraying end of the ozone ejector (8) stretches into a flue between an induced draft fan (6) and a sodium-calcium double-alkali desulfurization tower (9), the flue between the ozone ejector (8) and the induced draft fan (6) is communicated with a flue gas recirculation flue (4), and the other end of the flue gas recirculation flue (4) is communicated with a secondary air box (2).
2. The system of claim 1, wherein the system comprises: the cyclone water film dust collector (5) is of a cylindrical structure, and the height of the cylinder body is 6-10 times of the diameter of the cylinder body.
3. The system of claim 2, wherein the system comprises: a dust concentration measuring instrument for testing the dust concentration and the concentration of the drained water of the spray water is arranged at the outlet of the cyclone water film dust collector (5); a flue gas adjusting baffle is arranged at a flue gas inlet of the cyclone water film dust collector (5); the inlet flue of the cyclone water film dust collector (5) is provided with a flow guide plate with an adjustable angle.
4. The system of claim 1, wherein the system comprises: said combined removal of SO2/NOXThe system comprises a sodium-calcium dual-alkali desulfurization tower (9), wherein the lower part of the sodium-calcium dual-alkali desulfurization tower (9) is communicated with a first circulating water pump (15), the first circulating water pump (15) is sequentially connected with a reaction tank (16), a combined sedimentation tank (17), a circulating tank (18) and a second circulating water pump (19), and the second circulating water pump (19) is connected with the upper part of the sodium-calcium dual-alkali desulfurization tower (9).
5. The system of claim 1, wherein the system comprises: the flue gas recirculation flue (4) is provided with a flue gas recirculation regulating valve (14) for controlling the flue gas recirculation ratio to be 10-15%, and the flue gas recirculation flue (4) is flexibly connected with the flue and the secondary air box (2).
6. The system of claim 1, wherein the system comprises: the bottom end of the coal-fired starting boiler (3) is communicated with a primary air box (1), and all devices in the pollutant collaborative removal system are adjusted through a PLC automatic control system and software.
7. A removal method of the multi-pollutant collaborative removal system of the mobile coal-fired startup boiler according to any one of claims 1 to 6, characterized by comprising the following steps: flue gas enters a cyclone water film dust collector (5) to flow reversely with water mist for dust removal, ozone sprayed by an ozone sprayer (8) is fully mixed with the flue gas for denitration, desulfurization is carried out through a sodium-calcium double-alkali desulfurization tower (9), and finally, dust removal is carried out through a wet electrostatic dust collector (10); when the coal-fired starting boiler (3) is stably combusted, the flue gas recirculation regulating valve (14) is opened to regulate the flow of flue gas.
8. The removal method of the system for the cooperative removal of multiple pollutants from the mobile coal-fired startup boiler according to claim 7, wherein: the opening of a flue gas adjusting baffle plate at a flue gas inlet of the cyclone water film dust collector (5) is adjusted according to the change of the flue gas amount in the starting process, so that the flue gas entering the cyclone water film dust collector (5) is ensured to have an initial speed of 20 m/s; the angle of an inlet guide plate of the cyclone water film dust collector (5) is adjusted, so that the flue gas has the circumferential speed which is maximum along the cyclone water film dust collector (5) under different flue gas flow rates.
9. The removal method of the system for the cooperative removal of multiple pollutants from the mobile coal-fired startup boiler according to claim 8, wherein: in the reaction tank (16) is controlled when desulfurization is carried outThe slurry regeneration amount ensures that the pH value of the slurry is within 7-8; the slurry spraying flow of the second circulating water pump (19) is reasonably selected, and the liquid-gas ratio is controlled to be 2.5-2.6L/m3Within the range.
CN202011078907.1A 2020-10-10 2020-10-10 Mobile coal-fired startup boiler multi-pollutant collaborative removal system and method Pending CN112090255A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113251411A (en) * 2021-05-31 2021-08-13 国能神东煤炭集团有限责任公司 Multi-pollutant cooperative control system and method for coal-fired industrial boiler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113251411A (en) * 2021-05-31 2021-08-13 国能神东煤炭集团有限责任公司 Multi-pollutant cooperative control system and method for coal-fired industrial boiler

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