CN108654374A - A kind of ultra-clean Processing tecchnics system of flue gas - Google Patents

A kind of ultra-clean Processing tecchnics system of flue gas Download PDF

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Publication number
CN108654374A
CN108654374A CN201810821004.4A CN201810821004A CN108654374A CN 108654374 A CN108654374 A CN 108654374A CN 201810821004 A CN201810821004 A CN 201810821004A CN 108654374 A CN108654374 A CN 108654374A
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CN
China
Prior art keywords
ultra
temperature
deduster
transfer surface
temperature heat
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CN201810821004.4A
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Chinese (zh)
Inventor
姜志华
马伟
王帅
杜大全
王强
吴燕燕
张岩
孙国禹
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Ningbo Guodian Long Tech Environmental Engineering Technology Co Ltd
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Ningbo Guodian Long Tech Environmental Engineering Technology Co Ltd
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Priority to CN201810821004.4A priority Critical patent/CN108654374A/en
Publication of CN108654374A publication Critical patent/CN108654374A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • B01D53/8631Processes characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/30Particle separators, e.g. dust precipitators, using loose filtering material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

A kind of ultra-clean Processing tecchnics system of flue gas, it is related to the ultra-clean control emission field of flue gas of Industrial Boiler and kiln.The present invention solves existing SCR denitration system there are performances to be affected by load fluctuation, and resistance is higher, and pre-duster efficiency of dust collection is low, needs to increase the problem of second level cleaner could realize ultra-clean discharge before air-introduced machine.Smoke temperature regulating system, deduster, SCR reactors, residual neat recovering system, air-introduced machine and the ultra-clean desulfurating dust-removing equipment of the present invention is sequentially connected with from front to back, one end of reducing agent system and deduster inlet communication, the other end of reducing agent system and perturbator inlet communication, perturbator is arranged in SCR reactor inlets position, first thermocouple is arranged in high temperature heat-transfer surface entry position, second thermocouple is arranged in high temperature heat-transfer surface outlet port, and third the installation of TC is between medium temperature threeway valve outlet and deduster.The present invention is for realizing denitration smoke gas treatment after the first dedusting of ultra-clean discharge.

Description

A kind of ultra-clean Processing tecchnics system of flue gas
Technical field
The present invention relates to the ultra-clean control emission fields of the flue gas of Industrial Boiler and kiln, are controlled more particularly to a kind of flue gas is ultra-clean Science and engineering process system.
Background technology
As Environmental protection is increasingly paid attention to, more and more areas are more next to the discharge of boiler atmosphere pollution Stringenter, some areas execute the discharge of Industrial Boiler according to the ultra-clean discharge standard of thermal power plant.
It can realize that the denitration technology of the ultra-clean discharge of nitrogen oxides mainly has oxidizing process and SCR, wherein there are bright for oxidizing process Aobvious secondary pollution and operating cost is too high, and the denitration technology with technical and economic feasibility is mainly SCR.
The ash content that is generated in ash content or stove production process that coal itself contains is easy to make vehicle to SCR catalyst serious Abrasion and blocking, even if if having carried out good flow Field Design unavoidably;If containing a large amount of arsenic elements, potassium element in ash content It with sodium element etc., is also easy to cause catalyst poisoning, leads to inactivation in the catalyst short time, therefore, set before SCR reactors Setting dust-extraction unit is very important.One kind as DEC Dongfang Boiler (Group) Co., Ltd. invents is de- for SCR The centrifugal pre-dedusting device publication number of nitre:CN106621584A and:A kind of high the containing of West China energy project Co., Ltd invention The pre- dedusting structure publication number of cloud of dust gas SCR denitration system:CN206535365U etc. is sharp using rotation using member is centrifuged Wind deduster etc. to before denitration flue gas carry out and dedusting, the separative efficiency of centrifugal separation is limited, and resistance is larger, and its performance by Boiler or stove load fluctuation are affected.
In conclusion there are performances to be affected by load fluctuation for existing SCR denitration system, resistance is higher, pre-duster Efficiency of dust collection is low, needs to increase the problem of second level cleaner could realize ultra-clean discharge before air-introduced machine.
Invention content
The purpose of the present invention is to solve existing SCR denitration system, there are performances to be affected by load fluctuation, resistance Higher, pre-duster efficiency of dust collection is low, needs to increase the problem of second level cleaner could realize ultra-clean discharge before air-introduced machine, into And provide a kind of ultra-clean Processing tecchnics system of flue gas.
The technical scheme is that:
A kind of ultra-clean Processing tecchnics system of flue gas, it include smoke temperature regulating system, deduster, perturbator, SCR reactors, Residual neat recovering system, air-introduced machine, ultra-clean desulfurating dust-removing equipment, reducing agent system and automatic control system, smoke temperature regulating system are removed Dirt device, SCR reactors, residual neat recovering system, air-introduced machine and ultra-clean desulfurating dust-removing equipment are sequentially connected with from front to back, reducing agent system One end of system and deduster inlet communication, the other end of reducing agent system are connected to SCR Reactor inlets, and perturbator setting exists SCR reactor inlets position;
Smoke temperature regulating system includes high temperature heat-transfer surface, medium temperature heat-transfer surface, high-temperature three-way valve, medium temperature triple valve, low temperature threeway Valve, the bypass of the first low temperature, the bypass of the second low temperature, the first thermocouple, the second thermocouple and third thermocouple, high temperature heat-transfer surface is in Warm heat-transfer surface is sequentially arranged from front to back between stove and deduster, and an entrance of high-temperature three-way valve enters with high temperature heat-transfer surface Mouth connection, another entrance and the high temperature heat-transfer surface outlet of high-temperature three-way valve, outlet and the medium temperature threeway of high-temperature three-way valve One entrance of valve is connected to, another entrance and the medium temperature heat-transfer surface outlet of medium temperature triple valve, the outlet of medium temperature triple valve It being connected to the entrance of deduster, the entrance of low temperature triple valve is connected to ultra-clean desulfurating dust-removing equipment entrance, and the one of low temperature triple valve A outlet is connected to by the bypass of the first low temperature with deduster entrance, another outlet of low temperature triple valve is bypassed by the second low temperature It is connected to perturbator entrance, the setting of the first thermocouple exchanges heat in high temperature heat-transfer surface entry position, the setting of the second thermocouple in high temperature Face outlet port, third the installation of TC is on the pipeline between medium temperature threeway valve outlet and deduster, the first thermocouple, second Thermocouple and third thermocouple are connect with automatic control system.
Further, it further includes accumulatingdust system, is connected to by flue between medium temperature heat-transfer surface and residual neat recovering system, Accumulatingdust system is arranged between medium temperature heat-transfer surface and residual neat recovering system.
Further, accumulatingdust system includes that ash discharge partition board, ash discharge pipeline and lime-ash cooling equipment, the inclination of ash discharge partition board are set It sets on the walling of flue between medium temperature heat-transfer surface and residual neat recovering system, is opened up on the walling of flue of the relatively low one end of ash discharge partition board logical Hole, one end of ash discharge pipeline are connected to the through-hole on walling of flue, and the other end and the lime-ash cooling equipment or stove of ash discharge pipeline connect It is logical.
Further, reducing agent system includes reducing agent storage and feed system, the first distributor, the first spray gun and second Spray gun, the first spray gun are arranged on perturbator gas approach, and the second spray gun is arranged on deduster gas approach, the first distributor Between reducing agent storage and feed system and the first spray gun and the second spray gun, entrance and the reducing agent of the first distributor are deposited for setting Storage be connected to feed system, the one outlet of the first distributor is connect with the first spray gun, the first distributor another export and Second spray gun connects.
Further, it further includes first instrument and second instrument, and first instrument is arranged in SCR reactor outlets position, In SCR reactor inlets position, first instrument and second instrument are pressure and temperature detection instrument for second instrument setting.
Further, it further includes pollutant monitoring instrument, and pollutant monitoring instrument is arranged in SCR reactor outlets position It sets.
Further, deduster is high temperature filtration deduster, and the filtering material of deduster is metal fiber felt or ceramics.
Further, residual neat recovering system includes low-temperature heat exchange face, low-temperature heat exchange face be located at SCR reactors and air-introduced machine it Between, the entrance in low-temperature heat exchange face is connected to SCR reactor outlets, and the outlet in low-temperature heat exchange face is connected to air-introduced machine entrance.
The present invention has the following effects that compared with prior art:
1, the present invention is a kind of performance is not influenced by load fluctuation, does not influence stove operation, flue gas resistance is smaller, dedusting is imitated Rate is high, is not required to final dusting, and equipment life is long, the flue gas of denitration is ultra-clean after first dedusting that is light-weight, can realizing ultra-clean discharge Processing tecchnics system.Flue gas passes through stove, high temperature heat-transfer surface, medium temperature heat-transfer surface, deduster, SCR reactors, waste heat recovery successively The equipment such as system, air-introduced machine and ultra-clean desulfurating dust-removing equipment realize that heat release and pollution reduction are administered, and are discharged into eventually by chimney Air, house outlet connect perturbator, the uniform mixing for promoting reducing agent and flue gas;
2, efficient deduster is arranged before SCR reactors in a kind of flue gas ultra-clean Processing tecchnics system of the invention, and denitration is urged For agent there is no poisoning, dust stratification, blocking and abrasion risk, the deduster before denitration uses high temperature filtration deduster, efficiency of dust collection Height does not need final dusting, and overall resistance is low, and SCR reactors are not provided with soot blower, and the flue gas into SCR reactors has passed through It crosses high temperature filter collector and carries out high-effective dust-removing, catalyst poisoning, dust stratification, blocking and abrasion, denitration efficiency will not be caused completely Height, it is stable, effectively increase catalytic mechanical service life and reactor body service life;
3, residual neat recovering system of the invention is mainly low-temperature heat exchange face, and SCR reactor outlet smoke temperatures are higher, and smoke temperature is about 270 DEG C -400 DEG C, it is therefore desirable to enter low-temperature heat exchange face and further utilize waste heat, low-temperature heat exchange face can set ultra-clean desulfurization and dedusting Standby inlet flue gas temperature is reduced to 80 DEG C or so, and the fin spacing in low-temperature heat exchange face can largely reduce, and heat exchange thickness of pipe wall can be thinned To 1.0mm or so, low-temperature heat exchange face is small, light-weight, no abrasion, low cost, long lifespan;
4, the present invention is a kind of flue gas ultra-clean Processing tecchnics system, can be suitable for the waste heat boiler or boiler of stove simultaneously Economizer region, deduster of the invention and SCR reactors are arranged at boiler economizer or at the waste heat boiler of kiln, no Adverse effect is generated to the operation of stove ontology;
5, setting smoke temperature regulating system denitration performance can stablize reality not by boiler load influence of fluctuations before denitration of the invention The ultra-clean discharge of existing nitrogen oxides;
6, ultra-clean desulfurating dust-removing equipment of the invention realizes the ultra-clean desulfurization of flue gas and the ultra-clean row of particulate matter within one device It puts.
Description of the drawings
Fig. 1 is the structural schematic diagram that the present invention is applied at the waste heat boiler of stove;
Fig. 2 is the structural schematic diagram in the economizer region that the present invention is applied to boiler.
Specific implementation mode
Specific implementation mode one:Embodiment is described with reference to Fig. 1, a kind of ultra-clean Processing tecchnics of flue gas of present embodiment System, it includes smoke temperature regulating system, deduster 17, perturbator 14, SCR reactors 12, residual neat recovering system, air-introduced machine 8, surpasses Net desulfurating dust-removing equipment 7, reducing agent system and automatic control system, it is smoke temperature regulating system, deduster 17, SCR reactors 12, remaining Heat recovery system, air-introduced machine 8 and ultra-clean desulfurating dust-removing equipment 7 are sequentially connected with from front to back, one end of reducing agent system and dedusting 17 inlet communication of device, the other end and 12 inlet communication of SCR reactors of reducing agent system, perturbator 14 are arranged in SCR reactors 12 entry positions;
Smoke temperature regulating system includes high temperature heat-transfer surface 25, medium temperature heat-transfer surface 24, high-temperature three-way valve 4, medium temperature triple valve 22, low Warm triple valve 18, the first low temperature bypass the 19, second low temperature and bypass the 16, first thermocouple 2, the second thermocouple 23 and third thermocouple 21, high temperature heat-transfer surface 25 and medium temperature heat-transfer surface 24 are sequentially arranged from front to back between stove 1 and deduster 17, high-temperature three-way valve 4 entrance is connected to 25 entrance of high temperature heat-transfer surface, and another entrance and the outlet of high temperature heat-transfer surface 25 of high-temperature three-way valve 4 connect Logical, the outlet of high-temperature three-way valve 4 is connected to an entrance of medium temperature triple valve 22, another entrance of medium temperature triple valve 22 is in The outlet of 24 outlet of warm heat-transfer surface, medium temperature triple valve 22 is connected to the entrance of deduster 17, the entrance of low temperature triple valve 18 It is connected to 7 entrance of ultra-clean desulfurating dust-removing equipment, the one outlet of low temperature triple valve 18 passes through the first low temperature bypass 19 and deduster 17 entrances are connected to, another outlet of low temperature triple valve 18 is connected to by the second low temperature bypass 16 with 14 entrance of perturbator, and first The setting of thermocouple 2 is arranged in 25 entry position of high temperature heat-transfer surface, the second thermocouple 23 in 25 outlet port of high temperature heat-transfer surface, third Thermocouple 21 is mounted on the pipeline that medium temperature triple valve 22 exports between deduster 17, the first thermocouple 2, the second thermocouple 23 It is connect with automatic control system with third thermocouple 21.
Low temperature flue (bypass 19 of the first low temperature and the second low temperature bypass 16) is exported from ultra-clean desulfurating dust-removing equipment 7 and is drawn, It is not necessary that wind turbine is arranged, caused by the blocking of front end heat exchange area ash or other reasons when 12 inlet flue gas temperature superelevation of SCR reactors, open Low temperature triple valve 18 is opened, low-temperature flue gas is mixed into high-temperature flue gas, mixed position is controlled by the second thermocouple 23, works as cigarette It is no before low-temperature flue gas is mixed into perturbator 14 by the second low temperature bypass 16 when temperature degree is less than 17 safety margins of deduster Then, before being mixed into deduster 17 by the first low temperature bypass 19.
Specific implementation mode two:Embodiment is described with reference to Fig. 2, and present embodiment further includes accumulatingdust system, medium temperature It is connected to by flue between heat-transfer surface 24 and residual neat recovering system, accumulatingdust system is arranged in medium temperature heat-transfer surface 24 and waste heat recovery Between system.Low temperature flue (bypass 19 of the first low temperature and the second low temperature bypass 16) is exported from ultra-clean desulfurating dust-removing equipment 7 and is drawn, It is not necessary that wind turbine is arranged, caused by the blocking of front end heat exchange area ash or other reasons when 12 inlet flue gas temperature superelevation of SCR reactors, open Low temperature triple valve 18 is opened, low-temperature flue gas is mixed into high-temperature flue gas, mixed position is controlled by the second thermocouple 23, works as cigarette It is no before low-temperature flue gas is mixed into perturbator 14 by the second low temperature bypass 16 when temperature degree is less than 17 safety margins of deduster Then, before being mixed into deduster 17 by the first low temperature bypass 19.Other compositions and connection relation are same as the specific embodiment one.
Specific implementation mode three:Illustrate that present embodiment, the accumulatingdust system of present embodiment include in conjunction with Fig. 1 and Fig. 2 Ash discharge partition board 26, ash discharge pipeline 27 and lime-ash cool down equipment, and ash discharge partition board 26 is inclined at medium temperature heat-transfer surface 24 and waste heat returns On walling of flue between receipts system, open up through-hole on the walling of flue of 26 relatively low one end of ash discharge partition board, one end of ash discharge pipeline 27 with Through-hole connection on walling of flue, the other end and lime-ash the cooling equipment or stove 1 of ash discharge pipeline 27 are connected to.So set, anti-product Ash system is mainly used for original boiler economizer or the transformation of stove waste heat boiler, is entering SCR reactor flue gas extraction locations Upper layer and lower layer heat-transfer surface between setting together inclined antiwear heat resisting partition board, walling of flue or furnace wall in the relatively low one end of partition board Trepanning, dust stratification are discharged into lime-ash by the ash discharge pipeline in trepanning and cool down inside equipment or return stove.Other groups At the same as one or two specific embodiments with connection relation.
Specific implementation mode four:Illustrate that present embodiment, the reducing agent system of present embodiment include in conjunction with Fig. 1 and Fig. 2 Reducing agent stores and feed system 3, the first distributor 5, the first spray gun 15 and the second spray gun 20, and the setting of the first spray gun 15 is disturbing On 14 gas approach of device, the second spray gun 20 is arranged on 17 gas approach of deduster, and the setting of the first distributor 5 is stored in reducing agent Between feed system 3 and the first spray gun 15 and the second spray gun 20, the entrance of the first distributor 5, which is stored and supplied with reducing agent, is 3 connection of system, the one outlet of the first distributor 5 are connect with the first spray gun 15, another outlet and the second spray of the first distributor 5 Rifle 20 connects.So set, reducing agent is distributed to be mounted on and be disturbed by reducing agent storage and feed system 3 by the first distributor 5 The second spray gun 20 on 17 gas approach of the first spray gun 15 and deduster on 14 gas approach of dynamic device, the effect of the second spray gun 20 It is that reducing agent is mainly added and sprayed with accident, the effect of the first spray gun 15 is that reducing agent auxiliary adds.Other compositions and connection are closed System is identical as specific implementation mode one, two or three.
The reducing agent storage of present embodiment and feed system 3 include compressed air reservoir 3-1, desalination water storage tank 3-2, urine Plain solution reservoir 3-3, the first jet pump 3-4, the second jet pump 3-5 and the second distributor 3-6, the second distributor 3-6 settings exist Between desalination water storage tank 3-2 and urea liquid storage tank 3-3, an entrance of the second distributor 3-6 and going out for desalination water storage tank 3-2 Mouth connection, the outlet of another entrance and urea liquid storage tank 3-3 of the second distributor 3-6, the second distributor 3-6's goes out Mouth is connected to the entrance of the first distributor 5, and the first jet pump 3-4 is equipped between the second distributor 3-6 and desalination water storage tank 3-2, The second jet pump 3-5 is equipped between second distributor 3-6 and urea liquid storage tank 3-3, the outlet of compressed air reservoir 3-1 is distinguished It is connect with the first spray gun 15 and the second spray gun 20.The urea liquid storage tank 3-3 of present embodiment can be replaced according to actual conditions For tank used for storing ammonia.
Specific implementation mode five:Illustrate that present embodiment, present embodiment further include first instrument 13 in conjunction with Fig. 1 and Fig. 2 With second instrument 11, the setting of first instrument 13 is arranged in 12 outlet port of SCR reactors, second instrument 11 in SCR reactors 12 Entry position, first instrument 13 and second instrument 11 are pressure and temperature detection instrument.So set, SCR reactors 12 go out The first instrument 13 and second instrument 11 of entrance setting are used to monitor the operating status of SCR reactors 12.Other compositions and connection Relationship is identical as specific implementation mode one, two, three or four.
Specific implementation mode six:Illustrate that present embodiment, present embodiment further include pollutant monitoring in conjunction with Fig. 1 and Fig. 2 Instrument 10, pollutant monitoring instrument 10 are arranged in 12 outlet port of SCR reactors.So set, the outlet of SCR reactors 12 setting Dye analyte detection instrument 10 be used to detect reducing agent escape and the oxide concentration of the outlet of SCR reactors 12, and by data feedback To automatic control system, the operation for controlling reducing agent storage and feed system 3.Other compositions and connection relation and specific reality It is identical to apply mode one, two, three, four or five.
Specific implementation mode seven:Illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, the deduster 17 of present embodiment is high temperature The filtering material of filter collector, deduster 17 is metal fiber felt or ceramics.So set, high temperature filtration house outlet cigarette Gas dustiness meets the requirement of ultra-clean desulfurating dust-removing equipment 7, therefore need not increase between air-introduced machine 8 and residual neat recovering system Second level dedusting, the deashing of deduster 17 is using pulse dust cleaning or static deashing.Other compositions and connection relation and specific implementation Mode one, two, three, four, five or six are identical.
Specific implementation mode eight:Illustrate present embodiment, the residual neat recovering system packet of present embodiment in conjunction with Fig. 1 and Fig. 2 Low-temperature heat exchange face 9 is included, low-temperature heat exchange face 9 is between SCR reactors 12 and air-introduced machine 8, the entrance and SCR in low-temperature heat exchange face 9 The outlet of 12 outlet of reactor, low-temperature heat exchange face 9 is connected to 8 entrance of air-introduced machine.So set, SCR reactors 12 export Smoke temperature is higher, and smoke temperature is about 270 DEG C -400 DEG C, it is therefore desirable to enter low-temperature heat exchange face 9 and further utilize waste heat, low-temperature heat exchange face 9 can be reduced to 7 inlet flue gas temperature of ultra-clean desulfurating dust-removing equipment 80 DEG C or so, and the fin spacing in low-temperature heat exchange face 9 can largely contract Small, heat exchange thickness of pipe wall can be thinned to 1.0mm or so.Other compositions and connection relation and specific implementation mode one, two, three, four, Five, six or seven is identical.
Operation principle:
(1) when a kind of ultra-clean Processing tecchnics system of flue gas of the present invention is applied to the waste heat boiler of stove:
As shown in Figure 1:Smoke temperature is adjusted to adaptation deduster 17 by flue gas after stove 1 comes out, by smoke temperature regulating system, It subsequently enters deduster 17 to be dusted, deduster 17, which exports, connects perturbator 14 for promoting reducing agent and the uniform of flue gas to mix It closes, flue gas exits into SCR reactors 12 from perturbator 14 and carries out denitration, since the outlet of SCR reactors 12 smoke temperature is higher, needs Waste heat is further utilized, into residual neat recovering system, after the flue gas of residual neat recovering system outlet discharge is directly entered air-introduced machine 8 Ultra-clean desulfurating dust-removing equipment 7 is entered back into, the reducing agent of reducing agent system sprays into flue gas from deduster 17 or 14 front end of perturbator.
(1) when boiler load is reduced to 60%~80%, third thermocouple 21 detects that 12 inlet flue gas temperature of SCR reactors drops When low, 25 outlet side of high temperature heat-transfer surface of high-temperature three-way valve 4 is opened certain aperture by automatic control system, by medium temperature triple valve 22 25 outlet side of high temperature heat-transfer surface open certain aperture, part of smoke absorbs heat without medium temperature heat-transfer surface 24, is directly entered and removes Dirt device 17, for improving 12 inlet flue gas temperature of SCR reactors, the adjustment of high-temperature three-way valve 4 and medium temperature triple valve 22 is according to the second heat The measurement data of galvanic couple 23 and third thermocouple 21 is realized by automatic control system;
(2) when boiler load is reduced to 60%~30%, third thermocouple 21 detects 12 inlet flue gas temperature of SCR reactors again When secondary reduction, 25 entrance side of high temperature heat-transfer surface of high-temperature three-way valve 4 is opened certain aperture by automatic control system, by medium temperature threeway The low temperature side of valve 22 is closed, and by original by the 24 exothermic flue gas short circuit of medium temperature heat-transfer surface, 25 entrance flue gas of high temperature heat-transfer surface is mixed Conjunction reaches and enters deduster 17 after proper temperature, the adjustment of high-temperature three-way valve 4 and medium temperature triple valve 22 according to the first thermocouple 2, The measurement data of second thermocouple 23 and third thermocouple 21 is realized by automatic control system;
It (3), if necessary can be by high temperature heat-transfer surface 25 and medium temperature heat-transfer surface 24 when boiler load is reduced to 30% or less Short circuit, 1 exiting flue gas of stove are directly entered deduster 17;
(2) when a kind of ultra-clean Processing tecchnics system of flue gas of the present invention is applied to the economizer region of boiler:
As shown in Figure 2:Smoke temperature is adjusted to adaptation deduster 17 by flue gas after stove 1 comes out, by smoke temperature regulating system, It subsequently enters deduster 17 to be dusted, flue gas exits into SCR reactors 12 from perturbator 14 and carries out denitration, since SCR is anti- It answers the outlet of device 12 smoke temperature higher, needs further to utilize waste heat, into residual neat recovering system, export and be discharged from residual neat recovering system Flue gas be directly entered after air-introduced machine 8 and enter back into ultra-clean desulfurating dust-removing equipment 7, the reducing agent of reducing agent system from deduster 17 or 14 front end of person's perturbator sprays into flue gas;Anti- product is equipped between the medium temperature heat-transfer surface 24 and residual neat recovering system of flue gas extraction location Ash system, dust stratification are discharged into lime-ash by accumulatingdust system and cool down inside equipment or return stove.
(1) when boiler load is reduced to 60%~80%, third thermocouple 21 detects that 12 inlet flue gas temperature of SCR reactors drops When low, 25 outlet side of high temperature heat-transfer surface of high-temperature three-way valve 4 is opened certain aperture by automatic control system, by medium temperature triple valve 22 25 outlet side of high temperature heat-transfer surface open certain aperture, part of smoke absorbs heat without medium temperature heat-transfer surface 24, is directly entered and removes Dirt device 17, for improving 12 inlet flue gas temperature of SCR reactors, the adjustment of high-temperature three-way valve 4 and medium temperature triple valve 22 is according to the second heat The measurement data of galvanic couple 23 and third thermocouple 21 is realized by automatic control system;
(2) when boiler load is reduced to 60%~30%, third thermocouple 21 detects 12 inlet flue gas temperature of SCR reactors again When secondary reduction, 25 entrance side of high temperature heat-transfer surface of high-temperature three-way valve 4 is opened certain aperture by automatic control system, by medium temperature threeway The low temperature side of valve 22 is closed, and by original by the 24 exothermic flue gas short circuit of medium temperature heat-transfer surface, 25 entrance flue gas of high temperature heat-transfer surface is mixed Conjunction reaches and enters deduster 17 after proper temperature, the adjustment of high-temperature three-way valve 4 and medium temperature triple valve 22 according to the first thermocouple 2, The measurement data of second thermocouple 23 and third thermocouple 21 is realized by automatic control system;
It (3), if necessary can be by high temperature heat-transfer surface 25 and medium temperature heat-transfer surface 24 when boiler load is reduced to 30% or less Short circuit, 1 exiting flue gas of stove are directly entered deduster 17.

Claims (8)

1. a kind of ultra-clean Processing tecchnics system of flue gas, it is characterised in that:It includes smoke temperature regulating system, deduster (17), disturbance Device (14), SCR reactors (12), residual neat recovering system, air-introduced machine (8), ultra-clean desulfurating dust-removing equipment (7), reducing agent system and Automatic control system, smoke temperature regulating system, deduster (17), SCR reactors (12), residual neat recovering system, air-introduced machine (8) and super Net desulfurating dust-removing equipment (7) is sequentially connected with from front to back, one end and deduster (17) inlet communication of reducing agent system, reducing agent The other end of system and 12 inlet communication of SCR reactors (), perturbator (14) are arranged in SCR reactors (12) entry position;
Smoke temperature regulating system includes high temperature heat-transfer surface (25), medium temperature heat-transfer surface (24), high-temperature three-way valve (4), medium temperature triple valve (22), low temperature triple valve (18), the first low temperature bypass (19), the second low temperature bypass (16), the first thermocouple (2), the second thermoelectricity Even (23) and third thermocouple (21), high temperature heat-transfer surface (25) and medium temperature heat-transfer surface (24) are sequentially arranged from front to back in stove (1) between deduster (17), an entrance of high-temperature three-way valve (4) is connected to high temperature heat-transfer surface (25) entrance, high temperature tee joint Another entrance of valve (4) and high temperature heat-transfer surface (25) outlet, outlet and the medium temperature triple valve (22) of high-temperature three-way valve (4) The connection of an entrance, another entrance of medium temperature triple valve (22) and medium temperature heat-transfer surface (24) outlet, medium temperature triple valve (22) outlet is connected to the entrance of deduster (17), and entrance and the ultra-clean desulfurating dust-removing equipment (7) of low temperature triple valve (18) enter Mouth connection, the one outlet of low temperature triple valve (18) bypass (19) by the first low temperature and are connected to deduster (17) entrance, low temperature Another outlet of triple valve (18) is connected to by the second low temperature bypass (16) with perturbator (14) entrance, the first thermocouple (2) Setting is arranged in high temperature heat-transfer surface (25) entry position, the second thermocouple (23) in high temperature heat-transfer surface (25) outlet port, third Thermocouple (21) is mounted on the pipeline that medium temperature triple valve (22) exports between deduster (17), the first thermocouple (2), second Thermocouple (23) and third thermocouple (21) are connect with automatic control system.
2. the ultra-clean Processing tecchnics system of a kind of flue gas according to claim 1, it is characterised in that:It further includes accumulatingdust system System, medium temperature heat-transfer surface (24) are connected between residual neat recovering system by flue, and accumulatingdust system is arranged in medium temperature heat-transfer surface (24) between residual neat recovering system.
3. the ultra-clean Processing tecchnics system of a kind of flue gas according to claim 2, it is characterised in that:Accumulatingdust system includes row Grey partition board (26), ash discharge pipeline (27) and lime-ash cool down equipment, ash discharge partition board (26) be inclined at medium temperature heat-transfer surface (24) and On walling of flue between residual neat recovering system, through-hole, ash discharge pipeline are opened up on the walling of flue of ash discharge partition board (26) relatively low one end (27) one end is connected to the through-hole on walling of flue, and the other end and the lime-ash cooling equipment or stove (1) of ash discharge pipeline (27) connect It is logical.
4. the ultra-clean Processing tecchnics system of a kind of flue gas according to claim 1,2 or 3, it is characterised in that:Reducing agent system Including reducing agent storage and feed system (3), the first distributor (5), the first spray gun (15) and the second spray gun (20), the first spray gun (15) it is arranged on perturbator (14) gas approach, the second spray gun (20) is arranged on deduster (17) gas approach, first point Orchestration (5) setting is between reducing agent storage and feed system (3) and the first spray gun (15) and the second spray gun (20), the first distribution The entrance of device (5) is stored with reducing agent and feed system (3) is connected to, one outlet and the first spray gun of the first distributor (5) (15) it connects, another outlet of the first distributor (5) is connect with the second spray gun (20).
5. the ultra-clean Processing tecchnics system of a kind of flue gas according to claim 4, it is characterised in that:It further includes first instrument (13) exist in SCR reactors (12) outlet port, second instrument (11) setting with second instrument (11), first instrument (13) setting SCR reactors (12) entry position, first instrument (13) and second instrument (11) are pressure and temperature detection instrument.
6. the ultra-clean Processing tecchnics system of a kind of flue gas according to claim 5, it is characterised in that:It further includes pollution quality testing Instrument (10) is surveyed, pollutant monitoring instrument (10) is arranged in SCR reactors (12) outlet port.
7. the ultra-clean Processing tecchnics system of a kind of flue gas according to claim 4, it is characterised in that:Deduster (17) is high temperature The filtering material of filter collector, deduster (17) is metal fiber felt or ceramics.
8. the ultra-clean Processing tecchnics system of a kind of flue gas according to claim 1,2 or 3, it is characterised in that:Waste heat recovery system System includes low-temperature heat exchange face (9), and low-temperature heat exchange face (9) are located between SCR reactors (12) and air-introduced machine (8), low-temperature heat exchange face (9) entrance and SCR reactors (12) outlet, the outlet of low-temperature heat exchange face (9) is connected to air-introduced machine (8) entrance.
CN201810821004.4A 2018-07-24 2018-07-24 A kind of ultra-clean Processing tecchnics system of flue gas Pending CN108654374A (en)

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