CN106440833A - Wet-process dust removal, desulfurization and denitrification system and method for flue gas - Google Patents
Wet-process dust removal, desulfurization and denitrification system and method for flue gas Download PDFInfo
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- CN106440833A CN106440833A CN201610849685.6A CN201610849685A CN106440833A CN 106440833 A CN106440833 A CN 106440833A CN 201610849685 A CN201610849685 A CN 201610849685A CN 106440833 A CN106440833 A CN 106440833A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/50—Intercepting solids by cleaning fluids (washers or scrubbers)
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a wet-process dust removal, desulfurization and denitrification system for flue gas. The wet-process dust removal, desulfurization and denitrification system comprises combustion equipment, a heat exchanger, a reaction device and a liquid collection device, which are connected in sequence, wherein the heat exchanger has an openable modularized design and has an anticorrosion function; and meanwhile, the heat exchanger is equipped with a vibration dust removal device. By adopting the system, the flue gas is subjected to wet-process dust removal, desulfurization and denitrification, and then is gradually cooled; when the temperature of the flue gas in the reaction device is low enough, the air density is greatly improved and the flow speed is greatly reduced; the staying time of the flue gas in the reaction device is long enough so that the flue gas has sufficient time to participate in a dissolving and adsorption reaction; the treated flue gas has extremely low content of pollution components, can be directly discharged into the air and does not cause pollution to the air.
Description
Technical field
The invention belongs to the purification treatment technology field of flue gas, be specifically related to a kind of wet dedusting desulfurization denitrating system and method for flue gas.
Background technology
The gas cleaning treatment process of existing coal combustion equipment, need only to flue gas dedusting and desulphurization denitration twice respectively 611130 4th floors No. 7, Unit 3,1, No. 21, North Street, Liucheng, Wenjiang district of Chengdu city, Sichuan Province in process, due to still higher in the inner processed flue-gas temperature of cleaning equipment, make volume and the treating capacity of flue gas still larger, therefore, the time of flue gas participation innocent treatment procedure is too of short duration, the energy consumption that occurs flue gas processing drops into huge greatly, cost is high, and still undesirable real situation of flue gas ash removal and desulfurization off sulfide effect, so that many coal-burning power plants even if implemented environment protection treating technological transformation, but be still reluctant these treatment facility systems to put into operation, and select to connect be subject to environmental fines.
The harmless treatment process of flue gas comprises physics and chemistry process, and be that physics or chemical treating process all need the time to complete, the too short processing time causes flue gas not have time enough to dissolve and adsorption reaction in treatment facility inside, and acid-base neutralization reaction, this is that prior art implements to administer difficult basic reason to Coal-smoke Air Pollution.
Adopt and increase flue gas carrys out prolong smoke processing time at the operation length of Environmental-protecting treater inside, and by increasing exhaust gases passes sectional area, reduce the object that flue gas flow rate reaches the prolong smoke processing time. these two kinds of methods, although can reach the object in prolong smoke processing time, but all will cause treatment facility volume to become huge, thereby not be desirable solution.
Summary of the invention
For above-mentioned deficiency of the prior art, the invention provides a kind of wet dedusting desulfurization denitrating system and method for flue gas, can effectively solve the cost causing in flue gas processing procedure high, the problem such as the large and treatment effect of equipment volume is not good.
For achieving the above object, the technical solution adopted for the present invention to solve the technical problems is:
A wet dedusting desulfurization method of denitration for flue gas is before flue gas enters reaction unit, the flue gas producing to be lowered the temperature Process, in the function of heat exchanger, increase online dust removal design and increase the corrosion-resistant property improved at heat exchanger low-temperature region and establish Meter; The product structure that structurally adopts modularization to improve design and openable improves design, and then fume afterheat is entered Row reclaims, and the temperature of flue gas in the time entering reaction unit is reduced to and is applicable to the journey that employing wet dedusting desulfurization denitrating technique requires Degree.
Further, said method is also included in the flue gas stream passage in heat exchanger and connects one group of heat exchanger again, the waste heat of flue gas is carried out to secondary recovery, thereby flue gas is carried out to secondary cooling.
Further, said method is also included in reaction unit inside to be forced cooling to flue gas, it is to the processing of freezing of alkali lye used in wet dedusting desulfurization denitrating technique by heat pump techniques that flue gas is forced to cooling mode, its alkali lye and smoke reaction, reduced the reaction temperature of flue gas indirectly.
Further, the wet dedusting desulfurization method of denitration of flue gas, comprises the following steps:
(1) by fuel fully burning in combustion apparatus, the flue gas of generation passes into First Heat Exchanger, and flue gas and air are changed A wet dedusting desulfurization denitrating system for flue gas, comprises successively the combustion apparatus that connects, flue gas is lowered the temperature Put;
(2) pass into the second heat exchanger by processing the clean flue gas that obtains in reaction unit, after clean flue gas and one-level are lowered the temperature Flue gas carries out heat exchange, and flue gas is carried out to secondary cooling, and the flue gas after secondary cooling enters reaction unit;
(3) akaline liquid that participates in reaction is sent into spray equipment by spray pump, enter reaction unit by spray equipment with the form of water smoke again, contact with the flue gas in reaction unit, carry out wet dedusting desulfurization denitration reaction, reclaim reacting rear gained liquid with fluid collection device.
Further, in step (3), akaline liquid is carried out to forced refrigeration through refrigerating plant, make akaline liquid temperature lower than room temperature, sent into spray equipment by spray pump, enter reaction unit by spray equipment with the form of water smoke again, contact with the flue gas in reaction unit, the flue-gas temperature of reaction reduced, carry out at low temperatures wet dedusting desulfurization denitration reaction.
Heat, carries out one-level cooling to flue gas, and the flue gas after one-level cooling enters the second heat exchanger, and the air after heat exchange enters burning dress Heat exchanger, reaction unit and the fluid collection device processed; Described heat exchanger is for having anti-corrosion function, and installs on heat exchanger There is vibration dust remover.
Further, heat exchanger is modularization corrugated plate-type heat exchangers, and its shell is half movable semi-fixed type;
Modularization corrugated plate-type heat exchangers, comprises heat-exchanging component, two end water conservancy diversion modules and at least one middle water conservancy diversion module, Heat-exchanging component is formed by least one heat exchange module serial or parallel connection; Heat exchange module comprises heat exchange housing and waveform heat exchanger fin; Change Hot housing is upper and lower two rectangular structure that end face is uncovered; Waveform heat exchanger fin is stacked together, is fixed on heat exchange module housing In; Between adjacent described waveform heat exchanger fin, leave gas passage, the delivery outlet that enters of gas passage is arranged in uncovered one side;
End water conservancy diversion module comprises that having continuous three faces is arranged to uncovered guide tank, is fixedly installed some L of being in guide tank The channel partition of shape, the galianconism of adjacency channel dividing plate is in the inner space that vertical mode is distributed in guide tank, and by guide tank Inner space be divided into some being intervally arranged and preheating gas passage and exhaust steam passage that opening is vertical;
Middle water conservancy diversion module comprises that having continuous three faces is arranged to uncovered diversion shell, is arranged at intervals with tabular in diversion shell Dividing plate and L-shaped air baffle, and if plate shaped spacer and air baffle be in contact with one another diversion shell inner space be divided into Dry preheating gas passage and the exhaust steam passage being intervally arranged; Water conservancy diversion in the middle of being at least provided with one between adjacent two heat-exchanging components Module, each end water conservancy diversion module is installed on the free end of heat-exchanging component.
Further, between combustion apparatus and heat exchanger, be also provided with successively Rotary dust collecting equipment and smoke exhaust fan.
Further, the vibration dust remover on heat exchanger is vibrating motor; Low-temperature space on heat exchanger is by anti-corrosion material Make or scribble corrosion-inhibiting coating; Outer cover of heat exchanger movable part is connected by fastening clip with standing part.
Wet dedusting desulfurization denitrating system and the method for flue gas provided by the invention, have following beneficial effect:
(1) on heat exchanger, cleaner is installed, dust arrester installation site is relevant with outbound course with flue gas input, and it passes through The mode that vibration and gravity combine can be carried out dedusting by heat exchanger self, and heat exchanger efficiency can be improved; Heat exchanger low Warm area is made or is scribbled corrosion-inhibiting coating by anti-corrosion material, be because temperature, lower than dew-point temperature, will produce in heat transfer process Corrosive liquid drips on heat exchanger, and the therefore corrosion protection design of heat exchanger can be alleviated its dew point corrosion problem.
(2) at the heat exchanger of flue gas being lowered the temperature and processing, only need possess online dedusting function and anti-corrosion function, and In structure, adopt the modularized design of openable to use (the openable meaning is that heat exchanger can be opened in somewhere, For its inside is cleaned or other processing; The meaning of modularized design is that whole heat exchanger is divided into several functional independences Module, make each functional module be convenient to installation and removal, thereby make the maintenance work of heat exchanger simple and convenient), but existing Heat exchanger does not possess such function and structure, while therefore adopting existing heat exchanger in this process, need carry out function and knot to it Improvement on structure just can be used.
(3) heat exchanger adopts the product functionality of online dedusting (limit heat exchange limit dedusting) and low temperature (lower than dew-point temperature) corrosion protection design to improve design, for alleviating laying dust and the dew point corrosion problem of heat exchanger self, adopt the product structure of modularization and openable to improve design, make maintenance work simple and convenientization of heat exchanger in the operation phase, and then the overwhelming majority (waste heat energy is more than 50%) to fume afterheat reclaims, make flue gas be reduced to and be applicable to the degree that adopts wet dedusting desulfurization denitrating technique to require entering temperature after reaction unit.
(4) the present invention produces the flue gas processing of progressively lowering the temperature to fuel combustion, makes it meet wet dedusting desulfurization denitration The degree of technological requirement, its processing mode of progressively lowering the temperature is: flue gas and air carry out heat exchange, and the one-level that this process is flue gas is fallen Temperature, air is through heat exchanger heat exchange, and temperature raises, and high temperature air can be delivered into burner, use as combustion air, from And the waste heat of flue gas is tentatively recycled, the flue gas after one-level cooling again with reaction unit in the clean flue gas of discharging (low temperature) carries out heat exchange processing, and the secondary cooling that this process is flue gas, can further reduce the temperature of flue gas, can be reduced To about ambient temperature; According to the amount of flue gas and the original analysis of one-tenth, if exhaust gas volumn must be large, can be to the cigarette after secondary cooling Gas carries out three grades of coolings, carries out forced refrigeration by akaline liquid through refrigerating plant, makes akaline liquid temperature lower than room temperature, logical Cross spray pump and sent into spray equipment, then enter reaction unit by spray equipment with the form of water smoke, in reaction unit Flue gas contact, make the flue-gas temperature of reaction reduce (three grades of coolings), carry out at low temperatures wet dedusting desulfurization denitration reaction, warp After cooling layer by layer, flue gas is in the time that the temperature of reaction unit inside is enough low, and atmospheric density significantly rises, and flow velocity significantly reduces, cigarette The time that gas stops in reaction unit will long enough, has the sufficient time to participate in dissolving and adsorption reaction, has thereby remove Evil gas componant, discharges clean flue gas.
Brief description of the drawings
Fig. 1 is the wet dedusting desulfurization denitrating technique figure of flue gas.
Fig. 2 is the structural representation of heat exchange module and vibration dust remover.
Fig. 3 is a kind of structural representation of heat exchanger wherein.
Fig. 4 is the stereogram at a visual angle of heat exchange module.
Fig. 5 is the stereogram at another visual angle of heat exchange module.
Fig. 6 is the structural representation of end water conservancy diversion module.
Fig. 7 is the structural representation of middle water conservancy diversion module.
303, air baffle; 11, heat exchange module; 111, heat exchange housing; 112, waveform heat exchanger fin; 113, gas passage; 2, end water conservancy diversion module; 201, exhaust steam passage; 202, preheating gas passage; 203, channel partition; 2031, galianconism; 204, water conservancy diversion Case; 3, middle water conservancy diversion module; 301, diversion shell; 302, plate shaped spacer; Wherein, 1, heat-exchanging component.
Detailed description of the invention
Taking coal-burning power plant's device energy conservation environment-friendly engineering as example, wet dedusting desulfurization method of denitration and the system for use in carrying thereof of its flue gas, specifically see following description:
Bunker coal combustion apparatus be in boiler after abundant burning, after the flue gas that boiler produces leaves boiler, temperature also very high, flow velocity is also very fast, now the convenient rotating dust removing device that adopts carries out pretreatment to flue gas, remove wherein most of dust grain is not (if dust granules is many especially in flue gas, this operation can be omitted), then by smoke exhaust fan, high-temperature flue gas is sent into and changed hot device, at the flue gas through smoke exhaust fan, although temperature than just from boiler the temperature out time lower, but belong to high-temperature flue gas, therefore needing this high-temperature flue gas to carry out in heat exchanger heat exchange cooling processes.
In heat exchanger, flue gas is carried out to reducing temperature twice, this process need has 2 heat exchangers: high-temperature flue gas and air are In one heat exchanger, carry out heat exchange, the cooling of one-level that this process is flue gas, air is through First Heat Exchanger heat exchange, and temperature raises, can be by High temperature air delivers into burner, uses, thereby the waste heat of flue gas is tentatively recycled as combustion air; For Flue gas falls and temperature further reduce, need to be to the flue gas processing of lowering the temperature for the second time, introduce waste heat recovery cascade utilization Technical concept, overcomes combustion-supporting gas (air) flow and is less than the restriction of flue gas flow to flue gas waste heat recovery effect, overcomes heat exchange Contradiction between lifting and the product energy-saving efficiency of device product fume waste heat organic efficiency, further reduces the temperature of flue gas, can Further promote the effect of flue gas in subsequent treatment, by the flue gas after one-level cooling again with reaction unit in the clean cigarette of discharging Gas (low temperature) carries out heat exchange processing in the second heat exchanger, widens the UTILIZATION OF VESIDUAL HEAT IN mode of flue gas, the secondary that this process is flue gas Cooling, this process can be carried out heat exchange by flue gas lower to the flue gas after one-level cooling and the temperature obtaining after purified treatment, Both improve the diffusion conditions that flue gas discharges in atmospheric environment, and can reduce again the refrigeration plant that flue gas is carried out to forced refrigeration Power consumption.
According to the amount of flue gas and cost, optionally carry out the cooling for the third time of flue gas, (If exhaust gas volumn is few, for the third timeCooling can increase cost, then can not carry out third time cooling, reacts in and the flue gas after directly two grades being lowered the temperature is with akaline liquid in reaction device .)
Therefore in this process, need carry out improving just and can using on function and structure to it when existing heat exchanger significantly reduce, the time that flue gas stops in reaction unit is with regard to long enough, there is the sufficient time to participate in dissolving and adsorption reaction, its Oxide is dissolved in alkaline water smoke and is deposited to reaction unit bottom, with water in alkaline components continue occur neutralization reaction, remove the harmful components in flue gas, and exhaust gas dust particle adsorption moisture is deposited to reaction unit bottom and takes away .Cause with current this, very high through above-mentioned flue gas cleaning degree after treatment, can directly discharge.
The requirement of heat exchanger in above-mentioned processing procedure is that only need to possess online dedusting function and anti-corrosion function, and Modularized design in structure using openable can be used, but existing heat exchanger does not possess such function and structure, through three grades of coolings, flue gas is enough low in the temperature of reaction unit inside, now atmospheric density significantly rises, flow velocity:
In order to high-temperature flue gas are reduced to the temperature for suitably being processed using wet processing by temperature during heat exchanger, exchange is needed
The function of hot device does following improvement to reduce the frequency of maintenance of heat exchanger：
(1) Increase online dedusting function, alleviate the laying dust problem of heat exchanger, therefore, by increasing vibrating motor device and installing Enable the vibrational energy of vibrating motor equal to heat exchange module with heat exchanger fin vertical direction and on the side shield that need not open Even is delivered on heat exchanger fin to ensure the validity of dedusting work; Heat exchanger is erect and is installed, and makes to vibrate from heat exchanger fin and falls down The dust for coming enters the chamber of the reaction unit of lower section under the collective effect of gravity and flue gas stream along flue gas stream passage Body, takes away with current.
（2）Increase the etching problem that anti-corrosion function alleviates heat exchanger, will heat exchanger low-temperature space anti-using rustless steel etc.
Rotten material making or the low-temperature region surfaces externally and internally anticorrosion with painting coating of heat exchanger.
In order to high-temperature flue gas are reduced to the temperature for suitably being processed using wet processing by temperature during heat exchanger, also need
The structure of heat exchanger does following improvement to reduce the maintenance cost of heat exchanger：
(1) Heat exchanger adopts modularized design, and whole heat exchanger is divided into the module of several functional independences, the plant maintenance work such as makes taking apart for heat exchanger and assembling and replacing are more simple and convenient.
（2）The shell of heat exchanger adopts openable structure design, so that the maintenance work of heat exchanger is further simplified, only
The jet water course that shell giant need to be opened can just complete the line service of the overwhelming majority.
In sum, heat exchanger is the Modular heat exchanger of openable, is provided with vibration dust remover thereon（As Fig. 2
Shown, the installation site of dust arrester is with heat exchange module with heat exchanger fin vertical direction and on the side shield that need not open,
Which uniformly can be delivered on heat exchanger fin vibrational energy to ensure the effectiveness of dedusting work）, and heat exchanger has anti-corrosion
Function, the shell of heat exchanger is semi-active semi-fixed type, and movable part and standing part pass through fastening clip（As button is pulled in fastening）
Connection.
Heat exchanger can also be improved to following structure, i.e. modularity corrugated plate-type heat exchangers.As shown in figure 3, modularity ripple
Stricture of vagina plate type heat exchanger, including 1, two end water conservancy diversion modules 2 of heat-exchanging component and at least one middle water conservancy diversion module 3, heat-exchanging component 1
Formed by least one heat exchange module, 11 serial or parallel connection；Lead at least provided with a centre between two neighboring heat-exchanging component 1
Flow module 3, i.e. open and longitudinally disposed open connection of heat-exchanging component 1 of the one of longitudinal direction of middle water conservancy diversion module 3；Each end
Portion water conservancy diversion module 2 is installed on the free end of heat-exchanging component 1, i.e. open and heat exchange group of the one of longitudinal direction of end water conservancy diversion module 2
The open connection in the longitudinal direction of 1 free end of part.This programme is due to heat-exchanging component 1, end water conservancy diversion module 2 and middle 3 position of water conservancy diversion module
Unique setting the heat in flue gas can substantially be recycled, improve the response rate of heat in flue gas.
As shown in Figure 4 and Figure 5, heat exchange module 11 includes that heat exchange housing 111 and 112 heat exchange housing 111 of waveform heat exchanger fin are
The open rectangular structure of upper and lower two end faces；Waveform heat exchanger fin 112 is stacked together, is fixed in 11 housing of heat exchange module；
Gas passage 113 is left between the adjacent waveform heat exchanger fin 112, and the delivery outlet that enters of gas passage 113 is arranged on open one
On face.The Waveform Design of waveform heat exchanger fin 112, can make gas produce turbulent flow in heat exchange module 11, to improve gas with ripple
The heat transfer efficiency of shape heat exchanger fin 112；Waveform heat exchanger fin 112 is laminated in heat exchange module 11 can make the confined space hold more
Waveform heat exchanger fin 112, and then increased total heat exchange area, heat passes through ripple between two adjacent gas passages 113
Two surfaces of shape heat exchanger fin 112 carry out heat exchange, and then shorten the bang path of heat to greatest extent, it is to avoid the heat of heat
Residual effect is answered, and realizes combustion-supporting gas with waste gas in the internal whole process countercurrent flow of heat exchanger.
As shown in fig. 6, end water conservancy diversion module 2 includes to be arranged to open guide tank 204, guide tank with continuous three face
It is fixedly installed some L-shaped channel partitions 203 in 204, the perpendicular mode of the galianconism 2031 of adjacency channel dividing plate is distributed in
In the inner space of guide tank 204, and the inner space of guide tank 204 is divided into some it are intervally arranged and are open vertical pre-
Hot-gas channel 202 and exhaust steam passage 201.
As shown in fig. 7, middle water conservancy diversion module includes to be arranged to open diversion shell 301, blower inlet casing with continuous three face
Plate shaped spacer 302 and L-shaped air baffle 303, and plate shaped spacer 302 and 303 phase of air baffle are arranged at intervals with body 301
Mutually 301 inner space of diversion shell is divided into some preheating gas passages 202 being intervally arranged and exhaust steam passage 201 by contact.
By above-mentioned heat exchanger, flue gas lower with combustion air or temperature for high-temperature flue gas can be carried out heat exchange, combustion-supporting sky
Gas is formed low temperature combustion air, enters from the preheating gas passage 202 of heat exchanger after combustion air fan carries out partial warm down,
Flue gas can be entered from exhaust steam passage 201, carried out heat exchange by the waveform heat exchanger fin 112 on heat exchanger, made combustion-supporting after heat exchange
Air themperature is raised, and can enter combustion apparatus, so as to recycle to the waste heat of flue gas, while also a saving burning into
This, certainly, the waste heat of flue gas can also be reclaimed to which by waste-heat recovery device, in terms of other.
Claims (10)
1. the wet dedusting desulfurization method of denitration of a kind of flue gas, it is characterised in that to producing before flue gas enters reaction unit
Flue gas carries out cooling process, the online dust removal design of the functionally increase in heat exchanger and heat exchanger low-temperature region increase anti-corrosion
Improvement design；In structure using modularity Curve guide impeller and the product structure Curve guide impeller of openable and then right
Fume afterheat is reclaimed, and is reduced to temperature of the flue gas when reaction unit is entered and is suitable for using wet dedusting desulfurization denitration work
The degree that skill is required.
2. the wet dedusting desulfurization method of denitration of flue gas according to claim 1, it is characterised in that be additionally included in heat exchanger
In flue gas stream passage in reconnect one group of heat exchanger, secondary recovery is carried out to the waste heat of flue gas, so as to carry out two to flue gas
Level cooling.
3. the wet dedusting desulfurization method of denitration of flue gas according to claim 2, it is characterised in that be additionally included in reaction dress
Putting inside carries out pressure cooling to flue gas.
4. the wet dedusting desulfurization method of denitration of flue gas according to claim 3, it is characterised in that flue gas is forced
The mode of cooling is to carry out refrigeration process by heat pump techniques to alkali liquor used in wet dedusting desulfurization denitrating technique, its alkali liquor with
Smoke reaction, reduces the reaction temperature of flue gas indirectly.
5. the wet dedusting desulfurization method of denitration of the flue gas according to any one of claim 1-2, it is characterised in that include with
Lower step：
（1）Fuel is fully burnt in combustion apparatus, the flue gas of generation is passed through First Heat Exchanger, and flue gas is changed with air
Heat, carries out one-level cooling to flue gas, and the flue gas after one-level cooling enters the second heat exchanger, and the air after heat exchange enters burning dress
Put；
（2）The clean flue gas that obtain will be processed in reaction unit and is passed through the second heat exchanger, to after clean flue gas and one-level cooling
Flue gas carries out heat exchange, carries out two grades of coolings to flue gas, and the flue gas after two grades of coolings enters reaction unit；
（3）The akaline liquid for participating in reaction is sent to spray equipment by spray pump, then by spray equipment with water smoke
The smoke contacts that form is entered in reaction unit, with reaction unit, carry out wet dedusting desulfurization denitration reaction, collect dress with liquid
Put and gained liquid after reaction is reclaimed.
6. the wet dedusting desulfurization method of denitration of flue gas according to claim 5, it is characterised in that step（3）Middle by alkali
Property liquid carry out forced refrigeration through refrigerating plant, make akaline liquid temperature less than room temperature, spray be sent to by spray pump
Device, then the smoke contacts for being entered in reaction unit, with reaction unit in the form of water smoke by spray equipment, make the cigarette of reaction
Temperature degree reduces, and carries out wet dedusting desulfurization denitration reaction at low temperature.
7. the wet dedusting desulfurization denitrating system of a kind of flue gas, it is characterised in that including be sequentially connected combustion apparatus, to flue gas
Carry out heat exchanger, reaction unit and the fluid collection device of cooling process；The heat exchanger is the modularized design of openable,
And with anti-corrosion function, while vibration dust remover is installed on heat exchanger.
8. the wet dedusting desulfurization denitrating system of flue gas according to claim 7, it is characterised in that heat exchanger be
Corrugated plate-type heat exchangers, its shell is semi-active semi-fixed type；
Modularity corrugated plate-type heat exchangers, including heat-exchanging component, two end water conservancy diversion modules and at least one middle water conservancy diversion module,
The heat-exchanging component is formed by least one heat exchange module serial or parallel connection；The heat exchange module includes that heat exchange housing and waveform are changed
Backing；The heat exchange housing is the open rectangular structure of upper and lower two end faces；The waveform heat exchanger fin is stacked together, fixing
In heat exchange module housing；Gas passage is left between the adjacent waveform heat exchanger fin, and the delivery outlet that enters of gas passage is arranged on
In open one side；
The end water conservancy diversion module includes to be arranged to open guide tank with continuous three face, is fixedly installed in the guide tank
Some L-shaped channel partitions, the perpendicular mode of the galianconism of adjacency channel dividing plate is distributed in the inner space of guide tank, and will
The inner space of guide tank is divided into some preheating gas passages for being intervally arranged and being open vertical and exhaust steam passage；
The middle water conservancy diversion module includes to be arranged to open diversion shell with continuous three face, and in the diversion shell, interval sets
Plate shaped spacer and L-shaped air baffle is equipped with, and plate shaped spacer and air baffle are contacted with each other diversion shell inner space
It is divided into some preheating gas passages being intervally arranged and exhaust steam passage；At least provided with one between two neighboring heat-exchanging component
Middle water conservancy diversion module, each end water conservancy diversion module is installed on the free end of heat-exchanging component.
9. the wet dedusting desulfurization denitrating system of flue gas according to claim 8, it is characterised in that combustion apparatus and heat exchange
Rotary dust collecting equipment and smoke exhaust fan are also sequentially provided between device.
10. the wet dedusting desulfurization denitrating system of flue gas according to claim 8, it is characterised in that shaking on heat exchanger
Dynamic dust arrester is vibrating motor；Low-temperature space on heat exchanger is made up of anti-corrosion material or scribbles corrosion-inhibiting coating；Outer cover of heat exchanger
Movable part and standing part are connected by fastening clip.
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| CN201610849685.6A CN106440833A (en) | 2016-09-26 | 2016-09-26 | Wet-process dust removal, desulfurization and denitrification system and method for flue gas |
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| CN112696948A (en) * | 2020-12-25 | 2021-04-23 | 常州英索兰换热器有限公司 | Corrosion-resistant flue gas plate heat exchanger |
| CN112964079A (en) * | 2021-03-25 | 2021-06-15 | 天津海钢板材有限公司 | Flue gas recovery heat exchange device and heat exchange method for acid regeneration unit |
| CN113797693A (en) * | 2021-10-19 | 2021-12-17 | 广东佳德环保科技有限公司 | Wet type eddy current dust removal device and dust removal method thereof |
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Application publication date: 20170222 |