CN109724099A - A kind of white technique of boiler smoke qi exhaustion and device - Google Patents
A kind of white technique of boiler smoke qi exhaustion and device Download PDFInfo
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- CN109724099A CN109724099A CN201910094317.9A CN201910094317A CN109724099A CN 109724099 A CN109724099 A CN 109724099A CN 201910094317 A CN201910094317 A CN 201910094317A CN 109724099 A CN109724099 A CN 109724099A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a kind of white technique of boiler smoke qi exhaustion and device, the present invention uses a kind of white technology path that takes off of wet down depositing dust, and using high-temperature hot-air adjustment chimney suction and reduces flue gas relative humidity.The technology of the present invention carries out dedirt, cooling condensation dehumidification processing to the desulfurization neat stress after wet desulphurization device using efficient condensing cooling tower equipment；Surrounding air is introduced using gas heat exchanger simultaneously to exchange heat with high-temperature flue gas, the suction of flue-gas temperature and chimney is adjusted with high-temperature hot-air, and reduces the relative humidity of flue gas；So that cold neat stress and hot fume is exchanged heat using this gas heat exchanger and improve cold neat stress exhaust gas temperature, net cigarette energy gas after treatment is successfully sent into chimney, and white cigarette will not occur being rapidly decreased to environment temperature in flue-gas temperature when being discharged from throat.
Description
Technical field
The present invention relates to fume treatment technical fields, are suitable for boiler of power plant flue gas, coking of coal factory flue gas of heating furnace, steel
Factory's sintered ironmaking flue gas, petrochemical plant furnace flue gas and various types of dehumidifications containing humid gas take off white processing.
Background technique
With flourishing for national economic development, energy-consuming is continuously increased, especially to the dependence of fossil fuel
It will continue for a long time.Fossil fuel includes coal, petroleum, natural gas, generates flue gas when as fuel combustion, the pair that when burning generates
Reaction product pernicious gas, such as SO2、SO3、NOx、H2O、CO2Deng.Since these pernicious gases in flue gas drift about in an atmosphere
Air can be polluted, and can be dissolved in the water mist of condensation and be finally transferred to ground soil is made to be contaminated adverse condition.Because of a little countries
The flue gas that legislations of environmental protection requires all kinds of stoves to generate has to pass through purified treatment, and neat stress contains harmful gas concentration after processing
Atmosphere can be just discharged into after reaching specified value.Currently, all newly-built boiler of power plant, coke oven, iron making and sintering furnace and other heating furnaces
It is designed with denitration, desulfurizer, old factory is also required to be transformed to be additionally arranged denitration, desulfurizer.This environment-friendly engineering is extremely
The present is substantially basically completed, and the technique of use can be divided into two types, one is the denitration of SCR dry process is first used, followed by adopts
With lime stone-gypsum wet process or ammonia fertilizer wet desulphurization, also have using soda lye desulfurization；Another seed type is de- using Whote-wet method desulfurization
Nitre.
Relative humidity in flue gas after the flue gas that boiler of power plant production generates is handled by SCR Dry denitration and wet desulphurization
It improves, the moisture contained is close to saturation state.' plume ' white cigarette is generated when environment is discharged by chimney, this white cigarette is dissolved into cigarette
Part fine solid particles and harmful acid-base medium SO in gas3,NOx,NH3Go out Deng deterioration air quality and light transmission, solidifying wash rice
Drop pollute environment, therefore eliminate white cigarette be environmental protection requirement.
Since gas cleaning treatment process introduces wet processing, until being increased up the aqueous component of neat stress and flue-gas temperature
Comparable saturation content, the higher saturated water component of flue-gas temperature are also higher.When the flue gas for being higher than environment temperature is discharged into atmospheric environment
When, the air cooling of flue gas cooling water is solidifying to form white cigarette.There is the secondary pollution that the phenomenon that white cigarette actually wet processing process causes.
Therefore administering white cigarette or flue gas and taking off white is gas cleaning is handled after desulphurization denitration finishing operation.Flue gas takes off white be subjected to
To attention, relevant enterprise and the note power research and development of scientific research engineering department propose multinomial technology path and device, and in production operation
To practicing, the experience that has obtained.The various technology paths for proposing and using at present, main method have using flue gas
Method, flue gas cool-down method, flue gas cool-down heating.Flue gas method is that pipe heat exchanger is used to add indirectly using high-temperature flue gas as heat source
Hot cigarette, or steam is used to heat low temperature wet flue gas for heat source.Another flue gas method is using the direct combustion heating of combustion gas
Flue gas, or surrounding air is mixed into flue gas and is heated jointly, or is mixed using the waste-heat secondary air of former flue gas with flue gas.
This flue gas, which takes off white route, can raise flue-gas temperature and improve the degree of unsaturation of flue gas, but cannot reduce in flue gas
Absolute moisture content, it is therefore, effective to the elimination of plume in ambient air temperature higher season, but feelings lower for ambient air temperature
Under condition, such as at 15 DEG C or less, there is white plumage in smoke evacuation, and it is bad to eliminate white cigarette effect.Have for flue gas cool-down method and flue gas is carried out
Directly cool and cool indirectly two ways, flue gas cooling method by flue-gas temperature be reduced to environment temperature with
Under, and the white cigarette effect that can just remove smoke in the case that flue gas does not have water mist or mist Droplets to carry secretly.But at present in actual use
Cooling extent is limited, therefore cannot completely eliminate wet plume, and especially it is poor to take off white effect for temperature fluctuation or winter season flue gas.
Cooling heating is to reheat after condensed water is precipitated using indirect condensing cooled flue gas, or add again after using direct cooled flue gas
Heat promoted flue-gas temperature, this technology path method compared with above method it is more preferable compared with de- white effect, in non-extreme meteorological condition
Under can eliminate white cigarette.
Flue gas takes off the influence factor that is subject to of white effect, and the physics of existing flue gas itself and the characteristic of chemistry influence, also by
The fluid flow rule of smoke evacuation system influences, and is limited by original technique process units condition and the limitation of meteorological condition.I.e.
The neat stress after denitration sulfur removal technology device is handled, especially end is set to use the neat stress of wet desulfurizing process, still
Fine drop so containing saturation moisture content , Wu Droplets corresponding with flue-gas temperature entrainment, and remain in neat stress
SO3、SO2、NOx、NH3Equal acidic and alkaline gas and a small amount of solia particle.This is the material conditions for causing white cigarette.Flue gas enters
The temperature of flue gas after chimney, humidity, the volume flow of flue gas influence the suction or smoke evacuation ability of chimney.Moisture condensation in flue gas
Dropping liquid, which is precipitated, can also be such that chimney corrodes, and chimney root is cooled, so that influence the steady flow of flue gas system.Therefore, flue gas is de-
It is white not require nothing more than elimination white cigarette, and white cigarette can be effectively eliminated under any meteorological condition, the suction of chimney is also kept, no
The load of chimney can be excessively increased.
Current flue gas takes off white technology and is implemented with kinds of processes, such as: having using before neat stress after wet desulfuration tower and desulfurizing tower
Hot fume heat exchange, promoted temperature after be sent into smoke stack emission.The lift of chimney can be improved in this method, but cannot reduce cigarette
The humidity of gas, flue gas once enters the ambient air cooling that is cooled can condense out white water mist immediately.Have de- using multi-stage flue gas
Water installations and Multi-level gas-liquid separating device joint, dewatered flue gas couple with chimney.This method is for removing flue gas Wu Droplets
It carries secretly effective but also can remove the acid-base medium being partially dissolved in water droplet, but the removing to aqueous vapor is saturated in flue gas
Or reduce saturation degree there is no effect, the flue gas after chimney to the cold when still will appear white cigarette.Have using flue gas pressurization UF membrane side
Flue gas moisture content can be effectively reduced in method, and recycles the heat of compression and heat for low-temperature flue gas.But large-scale device is had not seen at present.
There is cooling means after mixing using the new air of environment with flue gas, or first make flue gas is cooling then to mix again with the new air of environment, mixes
Smoke stack emission is sent after closing gas heating.This method can reduce the relative humidity of exhaust, but subsequent gases treating capacity increases equipment and bears
Lotus amount increases.Have and white device is taken off using one kind, a kind of flue gas is set after wet desulphurization or wet electric precipitator and takes off white device, this
Kind device cold air cooled flue gas, flue gas enters dehydrator separation abjection condensed water after cooling, divides multistage refrigerated separation, handles
Flue gas is discharged into chimney afterwards.This method makes the cooling condensation condensed water of flue gas, while is heated air, more than effective use
Heat, the limited extent but flue gas cools cannot effectively eliminate white cigarette.There is a kind of boiler to take off white device, be a kind of heat exchanger,
Make cold air and the cooling precipitation condensed water of hot fume heat exchange flue gas, air is heated, and flue gas and hot wind mixing are discharged into after heat exchanger
Chimney.This method can reduce flue gas aqueous vapor amount, and being mixed into after air makes the reduction of gaseous mixture relative humidity, white have certain effect to taking off
Fruit, but the cooling extent of flue gas influences de- white effect with air capacity is blended into.
Summary of the invention
In order to effectively eliminate the white cigarette that the various stove chimney emissions such as boiler, coke oven, sintering furnace generate, flue gas is overcome to take off white
The problems such as chimney suction occurred in operation declines, dropping liquid in chimney, plume eradicating efficacy is limited to Meteorological Elements in China, this hair
It is bright to provide a kind of white technique of boiler smoke qi exhaustion and device, it is wet flue gas wet down depositing dust after denitration desulfurization and reduces relatively wet
Degree meets and discharges fume under any meteorological condition without Bai Yu.
The present invention is achieved by the following technical solutions:
A kind of white technique of boiler smoke qi exhaustion, process flow are that high temperature flue-gas from boiler successively passes through after SCR denitration device
Gas heat exchanger A7, economizer 2, deduster 13, gas heat exchanger B8, gas cooler 3, wet desulfuration tower 4 and flue gas dehumidification
Cooler 9 forms cold neat stress, and the flue gas that the cold neat stress after leaving flue gas dehumidification cooler 9 enters back into gas heat exchanger B8 is logical
Road simultaneously enters blender 11；Hot end and the gas heat exchanger A7 that air successively passes through gas heat exchanger B8 are aspirated with pressure fan 12,
Cold air is heated up into high temperature air, and high temperature air a part enters mixing machine 11 by regulating valve F and neat stress mixes
Chimney 5 is finally sent by air-introduced machine 6 and is discharged into atmosphere, remaining high temperature air is sent directly into 5 bottom-heated flue of chimney.
Cold air first with deduster after flue gas heat exchange, then with the flue gas heat exchange before economizer, air themperature first rises from room temperature
To 80 to 100 DEG C, then 150 to 200 DEG C are increased to, air mass flow is the 10-20% of exhaust gas volumn, after air mass flow and air heat-exchange
Temperature association adjusts slide valve K1 aperture, blends the high temperature air amount joint debugging related to flue-gas temperature before air-introduced machine after funnel of flue gas
Save regulating valve F aperture.
A kind of white device of boiler smoke qi exhaustion, including SCR denitration device 1, economizer 2, gas cooler 3, wet desulfuration tower
4, chimney 5, air-introduced machine 6, gas heat exchanger A7, gas heat exchanger B8, flue gas dehumidification cooler 9, liquid collecting tank 10, mixing machine 11,
Pressure fan 12 and deduster 13, SCR denitration device 1 successively with gas heat exchanger A7, economizer 2, deduster 13, gas heat exchanger
B8, gas cooler 3, wet desulfuration tower 4 and flue gas dehumidification cooler 9 connect, 9 side of flue gas dehumidification cooler and gas converting heat
The lower end device B8 connects and passes through mixing machine 11 and air-introduced machine 6 is connected to chimney 5, and pressure fan 12 passes through pipeline and gas heat exchanger B8
And gas heat exchanger A7 is sequentially connected and is connected to chimney 5, and flashboard is arranged on the flue of the SCR denitration device 1 to economizer 2
Slide valve K2, the cigarette of the wet desulfuration tower 4 to air-introduced machine 6 are arranged on the deduster 13 to 3 flue of gas cooler by valve K1
Slide valve K3 is added on road, regulating valve F is set between the pipeline and mixing machine 5 of the gas heat exchanger A7 to chimney 5.
The gas heat exchanger A7 and gas heat exchanger B8 is exchanged heat using metal plate type, by single or multiple can groups
Close, weld a certain number of spacing sticks between plate, gas heat exchanger exhaust gases passes flow to from top to bottom, air duct from left to right or
It flows to from right to left, flue gas, which comes downwards to heat exchanger exit turning point and is equipped with, collects grey ash exhauster.
The flue gas dehumidification cooler 9 is made of direct cooling section and indirect cooling section, direct cooling section and indirectly cooling
Demarcation plate 24 is equipped between section, direct cooling section is composed of the inner cylinder 20 and lower section cylinder 19 of concentric circles, inner cylinder 20
The annular space of formation between lower section cylinder 19 is flue gas washing area, is equipped with annular partition 32, lower section above annular space
The side of cylinder 19 is respectively equipped with lower section smoke inlet adapter tube 21, lower section circulation wash cooling water water inlet pipe 22 and lower section circulation and washes
Cooling water outlet adapter tube 33 is washed, bottom is equipped with sludge outlet adapter tube 18, and top is equipped with lower section exhanst gas outlet adapter tube 23, indirectly cooling
Section includes upper section cylinder 34, and the horizontally-arranged pipe row composition cooling water pipe bobbin carriage 28 of multiple groups, cooling water pipe bobbin carriage are equipped in upper section cylinder 34
28 upper and lower side is separately connected upper section recirculated cooling water discharge connection 27 and upper section recirculated cooling water water inlet adapter tube 29, upper section cylinder
The top of body 34 is equipped with upper section gas inlet adapter tube 26, and upper section gas inlet adapter tube 26 passes through upper with lower section exhanst gas outlet adapter tube 23
Lower section flue gas connecting tube 25 is connected to, and 34 side of upper section cylinder is equipped with upper section exhanst gas outlet adapter tube 30, and bottom is equipped with upper section condensate liquid
Discharge connection 31, upper section exhanst gas outlet adapter tube 30 are located at the lower section of cooling water pipe bobbin carriage 28.
Compared with prior art, the beneficial effects of the present invention are:
Flue gas of the present invention, which takes off white technique, can effectively adjust flue gas moisture content and its relative humidity, while can be by hot wind
Change the lift and smoke evacuation ability of chimney with the air quantity of hot fume and the adjusting of wind-warm syndrome；Air and net cigarette are heated using boiler afterheat
Gas adjusts the temperature of chimney using high temperature air, keeps chimney root temperature, and air usage amount is few；Cigarette is adjusted using hot-air
The relative density and relative humidity of gas, can adapt to the variation of meteorological condition；Cigarette is implemented using flat plate combined type gas heat exchanger
Gas and air heat-exchange and cold and hot flue gas heat exchange, structure is simple, processes convenient for installation and maintenance, heat transfer efficiency height；Using between vertical type
Direct-cooled flue gas condensing cooler, flue gas flow direction flows to identical with condensate liquid in the process, it is cooling after flue gas carried secretly and particle Wu Wu Droplets
Entrainment；Flue gas dehumidification cooling device is washed and is cooled down simultaneously to flue gas, and air-flow is main to identical as liquid flow path direction so that flue gas
With condensation water and washing water good separating effect, part of sulfuric acid salt can be removed and solia particle guarantees de- white effect of discharging fume.
Detailed description of the invention
Fig. 1 is flow sheet of the invention；
Fig. 2 is the structural schematic diagram of gas heat exchanger in the present invention；
Fig. 3 is flue gas dehumidification cooling device in the present invention.
In figure: 1, SCR denitration；2, economizer；3, gas cooler；4, wet desulfuration tower；5, chimney；6, air-introduced machine；7,
Gas heat exchanger A；8, gas heat exchanger B；9, flue gas dehumidification cooler；10, liquid collecting tank；11, mixing machine；12, pressure fan；13,
Deduster；K1, slide valve；K2, slide valve；K3, slide valve；F, regulating valve；14, exhaust gases passes；15, air duct, between 16, conjunction
Space；17, plate cassette；18, sludge water discharge connection；19, lower section cylinder；20, inner cylinder；21, lower section smoke inlet is taken over；
22, lower section recycles wash cooling water water inlet pipe；23, lower section exhanst gas outlet is taken over；24, demarcation plate；25, upper-lower section flue gas connects
Pipe；26, upper section gas inlet is taken over；27, upper section recirculated cooling water discharge connection；28, cooling water pipe bobbin carriage；29, upper section recycles
Cooling water intake adapter tube；30, upper section exhanst gas outlet is taken over；31, upper section condensate outlet is taken over；32, annular partition；33, under
Duan Xunhuan wash cooling water out adapter tube；34, upper section cylinder.
Specific embodiment
The following further describes the present invention with reference to the drawings:
The medium that gas heat exchanger is run in the present invention is air and hot fume and damp and hot flue gas and cold neat stress.Gas changes
Hot device construction is flat plate combined type, and with parallel metal partition by the gas partitions of two kinds of different potential temperatures, two kinds of gases are respectively leading to
It flows and conducts heat in road, partition is made into single piece of metal plate or is made into can, forms one by two or more cans
Can group, every group all there are two types of gas passages, finally form the gas that heat transfer area conforms to requirement by multiple can groups again
Heat exchanger.
Gas heat exchanger of the present invention has gas heat exchanger A and gas heat exchanger B, and gas heat exchanger A is used for air
It exchanges heat with high-temperature flue gas, the last period of gas heat exchanger B exchanges heat for air and hot fume, and latter section for cold neat stress and heat
Flue gas heat exchange.
The last period of gas heat exchanger B is introduced into pressure fan pump air and hot fume exchanges heat, and then enters back into gas
Heat exchanger A and high-temperature flue gas exchange heat, and the high temperature air after heat exchange is divided into two parts, and a part passes through mixing machine and gas heat exchanger
Net hot fume blending after latter section of B heat exchange, adjusts the relative humidity of flue gas and concurrent heating；Rest part inputs chimney and keeps chimney
Operation temperature and flue gas hoisting power, final two-way gas, which converges, is discharged into environment through chimney.Above-described hot fume refers to wet
Before method desulfurizing tower, flue gas after deduster, the high-temperature flue gas refers to the flue gas after SCR denitration device.
The flue gas dehumidification cooler is that a vertical type is indirectly cooling to be combined and integral heat exchange with direct cooling
Equipment, wherein the medium run is flue gas and recirculated cooling water.Flue gas dehumidification cooler is made of two sections, and upper section is indirect
Cooling section, lower section are direct cooling section, two sections divides.
Upper section cooling section is equipped with 6 to 8 group cooling tubes, and every group of cooling tube is equipped with the pipe row of 6 to 8 row of horizontal setting, every group of pipe
Two groups up and down are divided into, every group's pipe constitutes a channel, and fishing box connection is used at adjacent two group's pipe both ends up and down respectively,
All pipe groups are made to be connected in series to form cooling-water duct.The top of the indirect cooling section of upper section is taken over equipped with gas inlet, between upper section
The lower part for connecing cooling section is taken over equipped with exhanst gas outlet, and bottom is taken over equipped with condensate liquid outlet, sets in the fishing box of most upper tube row
There is cooling water outlet adapter tube, is taken in the fishing box of most down tube row equipped with cooling water intake.
The direct cooling section of lower section is a tubular construction, and centre is equipped with a concentric drums, the ring between inner cylinder and outer cylinder upper end
Shape face is equipped with annular partition, and exhanst gas outlet is equipped on the upside of annular partition and is taken over, the flue gas of the adapter tube and the indirect cooling section of upper section into
It mouthful is connected with upper-lower section flue gas connecting tube, gas inlet is equipped on the downside of annular partition and is taken over, after the air inlet pipe and wet desulfuration tower
Flue gas connection.Ring circumference is equipped with multiple circulation sprinkler heads below annular partition, is equipped in the bottom of the direct cooling section of lower section
Sludge outlet adapter tube is equipped with circulation wash cooling water out adapter tube in the lower section of inner cylinder.
When flue gas dehumidification cooler is run, flue gas is first taken over from the smoke inlet of the direct cooling section of lower section and is cut, from inside and outside
Annular space between cylinder rotates decline, uses recirculated water spray washing cooled flue gas, entrained solid impurity and sulphur in flue gas around here
Hydrochlorate is washed down and flows to cooling section bottom together with recirculated water, flue gas rotate to inner cylinder lower edge after from inner cylinder space
Rise, rises on inner cylinder along the space entered above annular partition, enter upper-lower section from the adapter tube export of lower section exhanst gas outlet and connect
Adapter tube enters the indirect cooling section cooling of upper section, a bottom is fallen into after lower section recirculated water washing cooled flue gas, then wash through lower section circulation
It washs cooling water outlet adapter tube and flows into circulation, be deposited in the regular outlet of sludge water at bottom.
Flue gas enters after the indirect cooling section of upper section passes through that pipe drainage is dynamic from top to down, pipe Volleyball Association of the recirculated cooling water under most
The adapter tube for connecing case enters, and the adapter tube of most upper comb row fishing box is from bottom to top flowed out along channel, is recycled subsequently into upper section cold
But water system.When the indirect cooling section of upper section is arranged by pipe, cooled water is cooling and condensed water, condensate liquid and flue gas is precipitated for flue gas
Flow to it is identical, it is cooling after flue gas do not carry condensate liquid Wu Droplets secretly.It takes over and exports from upper section exhanst gas outlet after being separated with condensate liquid, it is cold out
But close to recirculated cooling water leaving water temperature, condensate liquid is exported from the bottom coohng liquid discharge connection of cooling section to flow automatically device flue-gas temperature
It is stored into liquid collecting tank.
Flue-gas temperature can reach requirement by adjusting the mild water of recirculated cooling water after the processing of dehumidification cooler, drop to ring
Border temperature is hereinafter, be equivalent to the dew-point temperature of flue gas.
The exhaust gas temperature that flue gas is sent into that gas heat exchanger is close to chimney with hot fume heat exchange heating after dehumidification cooling is wanted
It asks, stablizes to meet the operating condition of chimney, flue gas fills into part high temperature air adjustment flue-gas temperature before entering air-introduced machine
And relative humidity, the purpose of the flow and temperature that adjust high temperature air are to guarantee not generate white cigarette, flue gas when flue gas discharge chimney
Dropping liquid does not occur in chimney, the gas relative density of chimney emission can also be adjusted.
Present invention process technology is white suitable for boiler smoke qi exhaustion, has been provided with SCR denitration device for boiler smoke system
1, it is equipped with economizer 2 after SCR denitration device 1, is equipped with nonaqueous dust cleaner 13 in succession after economizer 2, gas cooler 3 is wet
Flue gas is finally sent into chimney 5 by method desulfurizing tower 4, air-introduced machine 6.
Present invention process technology path is shown in Figure of description 1, and gas is added between SCR denitration device 1 and economizer 2 and changes
Gas heat exchanger B8 is added in hot device A7 between economizer 2 and gas cooler 3, after fume desulfurizing tower 4 and before air-introduced machine 6
Flue gas dehumidification cooler 9 is added.Slide valve K1 is set in SCR device 1 to 2 flue of economizer, it is cold to flue gas in deduster 13
Slide valve K2 is but set on 3 flue of device, slide valve K3 is added on the flue of wet desulfuration tower 4 to air-introduced machine 6, adjusts each flashboard
Valve disconnects original exhaust gases passes, and gas heat exchanger A7 is successively passed through after so that flue gas flow is changed to SCR denitration device, and economizer 2 removes
Dirt device 13, gas heat exchanger B8, gas cooler 3, wet desulfuration tower 4, flue gas dehumidification cooler 9, after leaving dehumidification cooler
Cold neat stress enter back into the exhaust gases passes of gas heat exchanger B8, mix, mix finally by mixing machine 11 and part high temperature air
Gentle pumped by air-introduced machine 6 into chimney 5 is discharged into atmosphere.
The air hot wind route newly increased, using pressure fan 12 aspirate air successively pass through gas heat exchanger B8 hot end and
Gas heat exchanger A7, cold air are heated up into high temperature air, and final high temperature air a part enters blending by regulating valve F
Device 11 and neat stress, which mix, is finally sent into 5 row of chimney and environment by air-introduced machine.Remaining most of high temperature air is sent directly into cigarette
Chimney bottom-heated flue.
High temperature air is associated with adjusting with exhaust gas temperature to the incorporation of flue gas, and exhaust gas temperature is maintained to stablize.
Air temperature control is associated with flue damper plate valve K1 aperture after heating, is adjusted slide valve K1 aperture and is dispatched flue gas flow
With air capacity ratio.
The present invention utilizes recycling boiler afterheat to heat air, adjusts control chimney root temperature and smoke evacuation using hot-air
Relative density, while the relative humidity for adjusting flue gas is added to flue gas using part high temperature air, the flue gas after being adjusted is sent
Smoke stack emission.
Dehumidification cooling device 9 of the present invention is that the indirectly cooling and directly cooling washing to integrally combine of a vertical type is cold
But equipment is shown in Figure of description 3.The device is divided into upper section cooling section and lower section cooling section, and lower section uses direct cooling mode, on
The indirect type of cooling of Duan Caiyong, lower section, which sprays flue gas recirculation using recirculated cooling water, to be rinsed, and removes part sulfate and subtle
Solid particle and pre- cold flue gas, flue-gas temperature is cooled to be reduced to close to environment temperature.The indirect cooling section of upper section is followed using low temperature
It is following to be cooled to environment temperature by ring water cooled flue gas for flue gas.
Device is as follows to the cooling wet down process of flue gas: the hot fume come from wet desulfuration tower initially enters described device
The lower section smoke inlet adapter tube 21 of lower section, flue gas enters the annular space between lower section cylinder 19 and inner cylinder 20 with cut-in manner
Rotation decline, lower section recycles wash cooling water water inlet pipe 22 and sprays wash cooling water to annular space to flue gas, thin in flue gas
Microparticle and sulfate are washed down, and flue gas is tentatively cooled down；Washing water falls into lower section cylinder body bottom, by flowing full from lower section
It recycles the outflow of wash cooling water out adapter tube 33 and enters lower section circulation.The lower along rear steering of inner cylinder 20 is screwed under flue gas
20 space of inner cylinder rises to the space between annular partition 32 and demarcation plate 24, into lower section exhanst gas outlet adapter tube 23, through upper
Lower section flue gas connecting tube 25 enters upper section cylinder 34, cools operation into upper section.
Flue gas enters from upper section gas inlet adapter tube 26, and low-temperature circulating cooling water pipe bobbin carriage 28 is passed through in flowing from top to down,
Low-temperature circulating cooling water enters from upper section recirculated cooling water entrance sleeve 29, full pipe row is flowed through one by one from below to up, finally from most
The outflow of circulating cooling discharge connection 27 of upper row returns to recirculating cooling water system.As the flue gas aqueous vapor in flue gas that cools is solidifying
Knot is precipitated, and the saturation vapor content of flue gas gradually decreases, the cooling finishing temperature of control cooling water inflow adjustment flue gas, and control flue gas is cold
But finishing temperature is to be determined to meet the economic benefit that flue gas takes off white technical requirements and production operation according to Meteorological Elements in China
Cooling finishing temperature.Flue-gas temperature is associated with adjusting with low-temperature circulating water flow after cooling.Flue gas after cooling is from cooling water pipe
The upper section exhanst gas outlet adapter tube 30 of pipe row lower section leaves described device.
The condensate liquid of upper section bottom is exported from upper section condensate outlet adapter tube 31, and gravity flow enters liquid collecting tank.
The sludge water of lower section deposition periodically send to go out from sludge from the export of outlet of sewer adapter tube 1.
Flue gas dehumidification cooling device lower section cooling section of the present invention uses 30 DEG C of recirculated water, after wet desulfuration tower
From 50 to 60 DEG C of flue gas are reduced to 33 to 35 DEG C, close to environment temperature.Upper section cooling section uses 18 DEG C of water at low temperature, by flue gas into one
Step is cooled to 20 DEG C to 22 DEG C.The water content of flue gas is reduced to every 1m under the status of criterion3The aqueous component of dry gas be less than 25g hereinafter,
Reliable guarantee is provided except white for flue gas.
The advantages of flue gas dehumidification cooling device of the present invention: dividing double diffusion, and low temperature water consumption is low, can be according to season
Section and meteorological condition adjust upper section manipulation strength；Using it is direct cooling and indirectly cooling combine, it is first direct-cooled after between cold operation, energy
It is enough to be washed down the impurity in flue gas first, prevent follow-up equipment fouling；Cooling process is flowed from the top to the bottom using flue gas
Mode can be such that condensate liquid smoothly falls and avoid generating back mixing He Wu Droplets entrainment, improves flue gas wet down depuration quality；First wash flue gas
Impurity is removed, cold between then carrying out, condensate liquid can recycle.
Gas heat exchanger of the invention is a kind of assembled flat formula gas-gas heat exchange equipment, and hot and cold gas is respectively in phase
It is flowed on adjacent channel, the type of flow can be adverse current, cross-flow or cocurrent.The spy of special efficient gas heat exchanger of the invention
Point is that gas flow resistance drop is small, and cold and hot two kinds of fluids carry out heat transfer in plate two sides, and cold conditions gas heating surface is not deposited uniformly
It is meeting hot face and is carrying on the back hot face, heat transfer efficiency is high.Gas parallel operation uses fabricated structure, and installing and dismounting maintenance is convenient, and material province makes
Valence is low.
In conclusion only presently preferred embodiments of the present invention, is not used to limit the scope of implementation of the present invention, it is all according to
Equivalent changes and modifications carried out by shape described in scope of the invention as claimed, construction, feature and spirit should be included in this
In the scope of the claims of invention.
Claims (5)
1. a kind of white technique of boiler smoke qi exhaustion, it is characterised in that: process flow is high temperature flue-gas from boiler after SCR denitration device
Successively pass through gas heat exchanger A (7), economizer (2), deduster (13), gas heat exchanger B (8), gas cooler (3), wet process
Desulfurizing tower (4) and flue gas dehumidification cooler (9) form cold neat stress, and the cold neat stress after leaving flue gas dehumidification cooler (9) is again
Exhaust gases passes and entrance blender (11) into gas heat exchanger B (8)；Successively pass through gas with pressure fan (12) suction air
The hot end of heat exchanger B (8) and gas heat exchanger A (7), cold air are heated up into high temperature air, and high temperature air a part is logical
It overregulates valve F and enters mixing machine (11) and neat stress and mix and be finally sent into chimney (5) by air-introduced machine (6) and be discharged into atmosphere, reinforcement
Warm air is sent directly into chimney (5) bottom-heated flue.
2. a kind of white technique of boiler smoke qi exhaustion according to claim 1, it is characterised in that: cold air elder generation and cigarette after deduster
Gas heat exchange, then with the flue gas heat exchange before economizer, air themperature first rises to 80 to 100 DEG C from room temperature, then is increased to 150 to 200
DEG C, air mass flow is the 10-20% of exhaust gas volumn, and temperature association adjusts slide valve K1 aperture after air mass flow and air heat-exchange, is mixed
The high temperature air amount adjusting regulating valve F aperture associated with flue-gas temperature before air-introduced machine after funnel of mixed flue gas.
3. a kind of white device of boiler smoke qi exhaustion, it is characterised in that: including SCR denitration device (1), economizer (2), gas cooler
(3), wet desulfuration tower (4), chimney (5), air-introduced machine (6), gas heat exchanger A (7), gas heat exchanger B (8), flue gas dehumidification drop
Warm device (9), liquid collecting tank (10), mixing machine (11), pressure fan (12) and deduster (13), SCR denitration device (1) successively with gas
Heat exchanger A (7), economizer (2), deduster (13), gas heat exchanger B (8), gas cooler (3), wet desulfuration tower (4) and
Flue gas dehumidification cooler (9) connection, flue gas dehumidification cooler (9) side connect with gas heat exchanger B (8) lower end and passes through blending
Device (11) and air-introduced machine (6) are connected to chimney (5), and pressure fan (12) passes through pipeline and gas heat exchanger B (8) and gas heat exchanger
A (7) is sequentially connected and is connected to chimney (5), and slide valve is arranged on the SCR denitration device (1) to the flue of economizer (2)
Slide valve K2, the wet desulfuration tower (4) to air-introduced machine are arranged on the deduster (13) to gas cooler (3) flue by K1
(6) slide valve K3 is added on flue, is arranged between the pipeline and mixing machine (5) of the gas heat exchanger A (7) to chimney (5)
Regulating valve F.
4. a kind of white device of boiler smoke qi exhaustion according to claim 3, it is characterised in that: the gas heat exchanger A (7) and
Gas heat exchanger B (8) is exchanged heat using metal plate type, is combined by single or multiple cans, it is a certain number of fixed to weld between plate
Away from stick, gas heat exchanger exhaust gases passes flow to from top to bottom, and air duct flows to from left to right or from right to left, and flue gas comes downwards to
Heat exchanger exit turning point, which is equipped with, collects grey ash exhauster.
5. a kind of white device of boiler smoke qi exhaustion according to claim 3, it is characterised in that: the flue gas dehumidification cooler
(9) it is made of direct cooling section and indirect cooling section, is equipped with demarcation plate (24) between direct cooling section and indirect cooling section, directly
Cooling section is composed of the inner cylinder (20) and lower section cylinder (19) of concentric circles, between inner cylinder (20) and lower section cylinder (19)
The annular space of formation be flue gas washing area, be equipped with annular partition (32) above annular space, the side of lower section cylinder (19)
It is respectively equipped with lower section smoke inlet adapter tube (21), lower section circulation wash cooling water water inlet pipe (22) and lower section circulation wash cooling water
Discharge connection (33), bottom are equipped with sludge outlet adapter tube (18), and top is equipped with lower section exhanst gas outlet adapter tube (23), indirect cooling section
Horizontally-arranged pipe row's composition cooling water pipe bobbin carriage (28) of multiple groups, cooling water pipe are equipped with including upper section cylinder (34), in upper section cylinder (34)
The upper and lower side of bobbin carriage (28) is separately connected upper section recirculated cooling water discharge connection (27) and upper section recirculated cooling water water inlet adapter tube
(29), the top of upper section cylinder (34) is equipped with upper section gas inlet adapter tube (26), and upper section gas inlet takes over (26) and lower section cigarette
Gas discharge connection (23) is connected to by upper-lower section flue gas connecting tube (25), and upper section cylinder (34) side is equipped with upper section exhanst gas outlet and connects
It manages (30), bottom is equipped with upper section condensate outlet adapter tube (31), and upper section exhanst gas outlet adapter tube (30) is located at cooling water pipe bobbin carriage
(28) lower section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910094317.9A CN109724099A (en) | 2019-01-30 | 2019-01-30 | A kind of white technique of boiler smoke qi exhaustion and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910094317.9A CN109724099A (en) | 2019-01-30 | 2019-01-30 | A kind of white technique of boiler smoke qi exhaustion and device |
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| CN109724099A true CN109724099A (en) | 2019-05-07 |
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| CN201910094317.9A Pending CN109724099A (en) | 2019-01-30 | 2019-01-30 | A kind of white technique of boiler smoke qi exhaustion and device |
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| CN (1) | CN109724099A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145756A (en) * | 2019-05-31 | 2019-08-20 | 浙江特富锅炉有限公司 | A kind of flue gas of heating boiler disappears white system |
| CN110819747A (en) * | 2019-09-30 | 2020-02-21 | 广东韶钢松山股份有限公司 | Blast furnace slag flushing dead steam eliminating and waste heat recovery system |
-
2019
- 2019-01-30 CN CN201910094317.9A patent/CN109724099A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145756A (en) * | 2019-05-31 | 2019-08-20 | 浙江特富锅炉有限公司 | A kind of flue gas of heating boiler disappears white system |
| CN110145756B (en) * | 2019-05-31 | 2023-12-22 | 浙江特富锅炉有限公司 | Flue gas whitening system of heating boiler |
| CN110819747A (en) * | 2019-09-30 | 2020-02-21 | 广东韶钢松山股份有限公司 | Blast furnace slag flushing dead steam eliminating and waste heat recovery system |
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