CN208591714U - 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
CN208591714U
CN208591714U CN201821178442.5U CN201821178442U CN208591714U CN 208591714 U CN208591714 U CN 208591714U CN 201821178442 U CN201821178442 U CN 201821178442U CN 208591714 U CN208591714 U CN 208591714U
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China
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ultra
temperature
deduster
transfer surface
temperature heat
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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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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 utility model 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 is just able to achieve ultra-clean discharge before air-introduced machine.The smoke temperature regulating system, deduster, SCR reactor, residual neat recovering system, air-introduced machine and ultra-clean desulfurating dust-removing equipment of the utility model are sequentially connected with from front to back, one end of reducing agent system and deduster inlet communication, the other end and perturbator inlet communication of reducing agent system, perturbator is arranged in SCR reactor inlet 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 utility model 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 utility model relates to the ultra-clean control emission fields of the flue gas of Industrial Boiler and kiln, super more particularly to a kind of flue gas Net Processing tecchnics system.
Background technique
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.
The denitration technology that can be realized the ultra-clean discharge of nitrogen oxides mainly has oxidizing process and SCR, and 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 generates in the ash content or stove production process that coal itself contains is easy to make vehicle to SCR catalyst serious Abrasion and blocking, even if having carried out good flow Field Design, also 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 reactor Setting dust-extraction unit is very important.As one kind of DEC Dongfang Boiler's utility model is used for The centrifugal pre-dedusting device publication number of SCR denitration: CN106621584A and: West China energy project Co., Ltd utility model A kind of pre- dedusting structure publication number of high ash-laden gas SCR denitration system: CN206535365U etc. is using centrifuge separation member Benefit is carried out using cyclone dust collectors etc. to flue gas before denitration and dedusting, and centrifugal isolated separative efficiency is limited, and resistance is larger, and Its performance is affected by boiler or stove load fluctuation.
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 is just able to achieve ultra-clean discharge before air-introduced machine.
Utility model content
Purpose of the utility model is to solve existing SCR denitration system, there are performances to be affected by load fluctuation, Resistance is higher, and pre-duster efficiency of dust collection is low, and increase second level cleaner is needed just to be able to achieve asking for ultra-clean discharge before air-introduced machine Topic, and then a kind of ultra-clean Processing tecchnics system of flue gas is provided.
The technical solution of the utility model is:
A kind of ultra-clean Processing tecchnics system of flue gas, it include smoke temperature regulating system, deduster, perturbator, SCR reactor, 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 reactor, 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 inlet, and perturbator setting exists SCR reactor inlet 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 high temperature heat-transfer surface outlet of high-temperature three-way valve, the outlet and medium temperature threeway of high-temperature three-way valve One entrance of valve is connected to, another entrance and 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 between medium temperature heat-transfer surface and residual neat recovering system by flue, Accumulatingdust system is arranged between medium temperature heat-transfer surface and residual neat recovering system.
Further, accumulatingdust system includes the cooling equipment of ash discharge partition, ash discharge pipeline and lime-ash, and the inclination of ash discharge partition is 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 lower one end of ash discharge partition logical The one end in hole, ash discharge pipeline is connected to the through-hole on walling of flue, and the cooling equipment of the other end and lime-ash of ash discharge pipeline or stove 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 The connection of second spray gun.
Further, it further includes first instrument and second instrument, and first instrument is arranged in SCR reactor outlet position, In SCR reactor inlet 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 outlet 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 reactor and air-introduced machine it Between, the entrance in low-temperature heat exchange face is connected to SCR reactor outlet, and the outlet in low-temperature heat exchange face is connected to air-introduced machine entrance.
The utility model has the effect that compared with prior art
1, the utility model is that a kind of performance is not influenced by load fluctuation, does not influence stove operation, flue gas resistance is smaller, removes Dirt is high-efficient, is not required to final dusting, equipment life is long, after first dedusting that is light-weight, can be realized ultra-clean discharge denitration flue gas Ultra-clean Processing tecchnics system.Flue gas successively passes through stove, high temperature heat-transfer surface, medium temperature heat-transfer surface, deduster, SCR reactor, waste heat The equipment such as recovery system, air-introduced machine and ultra-clean desulfurating dust-removing equipment realize that heat release and pollution reduction are administered, eventually by chimney It is discharged into atmosphere, house outlet connects perturbator, for promoting the uniform mixing of reducing agent and flue gas;
2, efficient deduster is arranged before SCR reactor in a kind of flue gas of the utility model ultra-clean Processing tecchnics system, takes off Poisoning, dust stratification, blockage and wear risk is not present in denox catalyst, and the deduster before denitration uses high temperature filtration deduster, dedusting It is high-efficient, do not need final dusting, overall resistance is low, and SCR reactor is not provided with soot blower, into SCR reactor flue gas Through carrying out high-effective dust-removing by high temperature filtration deduster, catalyst poisoning, dust stratification, blockage and wear, denitration not will lead to completely It is high-efficient, it is stable, effectively increase catalytic mechanical service life and reactor body service life;
3, the residual neat recovering system of the utility model is mainly low-temperature heat exchange face, and SCR reactor outlet smoke temperature is higher, smoke temperature About 270 DEG C -400 DEG C, it is therefore desirable to further utilize waste heat into low-temperature heat exchange face, low-temperature heat exchange face can remove ultra-clean desulfurization Dirt equipment entrance smoke 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 with It is thinned to 1.0mm or so, low-temperature heat exchange face is small in size, light-weight, no abrasion, low cost, and the service life is long;
4, the utility model is a kind of ultra-clean Processing tecchnics system of flue gas, can be suitable for the waste heat boiler or pot of stove simultaneously The economizer region of furnace, the deduster and SCR reactor of the utility model are arranged at boiler economizer or the waste heat of kiln At boiler, adverse effect is not generated to the operation of stove ontology;
5, setting smoke temperature regulating system denitration performance, can be steady not by boiler load influence of fluctuations before the denitration of the utility model Surely the ultra-clean discharge of nitrogen oxides is realized;
6, the ultra-clean desulfurating dust-removing equipment of the utility model realizes that the ultra-clean desulfurization of flue gas and particulate matter are super within one device Net discharge.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the utility model is applied at the waste heat boiler of stove;
Fig. 2 is the structural schematic diagram in the economizer region that the utility model is applied to boiler.
Specific embodiment
Specific embodiment 1: 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 reactor 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 reactor 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 reactor of reducing agent system, perturbator 14 are arranged in SCR reactor 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, another entrance and high temperature heat-transfer surface 25 outlet 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 Warm 24 outlet of heat-transfer surface, the outlet of medium temperature triple valve 22 are connected to the entrance of deduster 17, the entrance of low temperature triple valve 18 It is connected to ultra-clean 7 entrance of desulfurating dust-removing equipment, the one outlet of low temperature triple valve 18 passes through the first low temperature bypass 19 and deduster Another outlet of the connection of 17 entrances, 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 between the outlet of medium temperature triple valve 22 and 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, No setting is required blower when the 12 inlet flue gas temperature superelevation of SCR reactor caused by the blocking of front end heat exchange area ash or other reasons, is opened 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 embodiment 2: embodiment is described with reference to Fig. 2, present embodiment further includes accumulatingdust system, medium temperature It is connected between heat-transfer surface 24 and residual neat recovering system by flue, the setting of accumulatingdust system is recycled in medium temperature heat-transfer surface 24 and waste heat 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, No setting is required blower when the 12 inlet flue gas temperature superelevation of SCR reactor caused by the blocking of front end heat exchange area ash or other reasons, is opened 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 relationship are same as the specific embodiment one.
Specific embodiment 3: illustrating that present embodiment, the accumulatingdust system of present embodiment include in conjunction with Fig. 1 and Fig. 2 The cooling equipment of ash discharge partition 26, ash discharge pipeline 27 and lime-ash, ash discharge partition 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 the lower one end of ash discharge partition 26, one end of ash discharge pipeline 27 with The other end of through-hole connection on walling of flue, ash discharge pipeline 27 is connected to the cooling equipment of lime-ash or stove 1.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 location Upper layer and lower layer heat-transfer surface between setting together inclined antiwear heat resisting partition, walling of flue or furnace wall in the lower one end of partition Aperture, dust stratification are discharged into the cooling equipment of lime-ash by the ash discharge pipeline being mounted in aperture or return inside stove.Other groups At the same as one or two specific embodiments with connection relationship.
Specific embodiment 4: illustrating that present embodiment, the reducing agent system of present embodiment include in conjunction with Fig. 1 and Fig. 2 Reducing agent storage and feed system 3, the first distributor 5, the first spray gun 15 and the second spray gun 20, the setting of the first spray gun 15 are 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 and reducing agent of the first distributor 5, which are stored and supplied, 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 dynamic 14 gas approach of device, the effect of the second spray gun 20 Be reducing agent mainly add with accident spray, the effect of the first spray gun 15 be reducing agent auxiliary add.Other compositions and connection are closed It is identical as specific embodiment 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 setting 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, another entrance of the second distributor 3-6 and the outlet of urea liquid storage tank 3-3, 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 the actual situation For tank used for storing ammonia.
Specific embodiment 5: illustrating 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 reactor, second instrument 11 in SCR reactor 12 Entry position, first instrument 13 and second instrument 11 are pressure and temperature detection instrument.So set, SCR reactor 12 goes out The first instrument 13 and second instrument 11 of entrance setting are used to monitor the operating status of SCR reactor 12.Other compositions and connection Relationship and specific embodiment one, two, three or four are identical.
Specific embodiment 6: illustrating 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 reactor.So set, the outlet of SCR reactor 12 setting Dye analyte detection instrument 10 be used to detect reducing agent escape and the oxide concentration of the outlet of SCR reactor 12, and by data feedback To automatic control system, for controlling the operation of reducing agent storage and feed system 3.Other compositions and connection relationship and specific reality It is identical to apply mode one, two, three, four or five.
Specific embodiment 7: illustrating present embodiment in conjunction with Fig. 1 and Fig. 2, the deduster 17 of present embodiment is high temperature Filter collector, the filtering material of deduster 17 are 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 does not need to 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 relationship and specific implementation Mode one, two, three, four, five or six are identical.
Specific embodiment 8: illustrating 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 reactor 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 reactor 12 exports 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 Ultra-clean 7 inlet flue gas temperature of desulfurating dust-removing equipment can be reduced to 80 DEG C or so by 9, 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 relationship and specific embodiment one, two, three, four, Five, six or seven is identical.
Working principle:
(1) when a kind of ultra-clean Processing tecchnics system of flue gas of the utility model is applied to the waste heat boiler of stove:
As shown in Figure 1: flue gas from stove 1 come out after, by smoke temperature regulating system by smoke temperature be adjusted to adapt to deduster 17, 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 enters SCR reactor 12 from the outflow of perturbator 14 and carries out denitration, since the outlet of SCR reactor 12 smoke temperature is higher, needs Waste heat is further utilized, into residual neat recovering system, after the flue gas being discharged from residual neat recovering system outlet 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 reactor 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 reactor, 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 reactor 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 short circuit of the exothermic flue gas of medium temperature heat-transfer surface 24,25 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 utility model is applied to the economizer region of boiler:
It is as shown in Figure 2: flue gas from stove 1 come out after, by smoke temperature regulating system by smoke temperature be adjusted to adapt to deduster 17, It subsequently enters deduster 17 to be dusted, flue gas enters SCR reactor 12 from the outflow of perturbator 14 and carries out denitration, since SCR is anti- It answers the outlet of device 12 smoke temperature higher, needs further to export and be discharged from residual neat recovering system into residual neat recovering system using waste heat 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 the cooling equipment of lime-ash by accumulatingdust system or return inside stove.
(1) when boiler load is reduced to 60%~80%, third thermocouple 21 detects that 12 inlet flue gas temperature of SCR reactor 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 reactor, 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 reactor 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 short circuit of the exothermic flue gas of medium temperature heat-transfer surface 24,25 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 reactor (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 reactor (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 of reducing agent system and deduster (17) inlet communication, reducing agent The other end and SCR reactor (12) inlet communication of system, perturbator (14) are arranged in SCR reactor (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 and high temperature heat-transfer surface (25) outlet of valve (4), the outlet and 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 The one outlet of mouth connection, low temperature triple valve (18) is connected to by the first low temperature bypass (19) with 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 between medium temperature triple valve (22) outlet and 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, is connected between medium temperature heat-transfer surface (24) and 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 (26), the cooling equipment of ash discharge pipeline (27) and lime-ash, ash discharge partition (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 (26) lower one end (27) one end is connected to the through-hole on walling of flue, and the cooling equipment of the other end and lime-ash of ash discharge pipeline (27) or stove (1) are even 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, and 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, the 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 with second instrument (11), first instrument (13) setting in SCR reactor (12) outlet port, second instrument (11) setting SCR reactor (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 It surveys instrument (10), pollutant monitoring instrument (10) is arranged in SCR reactor (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 Filter collector, the filtering material of deduster (17) are 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 recycling system System includes low-temperature heat exchange face (9), and low-temperature heat exchange face (9) are located between SCR reactor (12) and air-introduced machine (8), low-temperature heat exchange face (9) entrance and SCR reactor (12) outlet, the outlet of low-temperature heat exchange face (9) is connected to air-introduced machine (8) entrance.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108654374A (en) * 2018-07-24 2018-10-16 宁波国电龙高科环境工程技术有限公司 A kind of ultra-clean Processing tecchnics system of flue gas

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108654374A (en) * 2018-07-24 2018-10-16 宁波国电龙高科环境工程技术有限公司 A kind of ultra-clean Processing tecchnics system of flue gas

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