CN109260947A - A kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat - Google Patents
A kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat Download PDFInfo
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- CN109260947A CN109260947A CN201811413023.XA CN201811413023A CN109260947A CN 109260947 A CN109260947 A CN 109260947A CN 201811413023 A CN201811413023 A CN 201811413023A CN 109260947 A CN109260947 A CN 109260947A
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- regenerator
- flue gas
- heat storage
- denitration
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000003546 flue gas Substances 0.000 title claims abstract description 74
- 238000009825 accumulation Methods 0.000 title description 14
- 238000005338 heat storage Methods 0.000 claims abstract description 80
- 239000000779 smoke Substances 0.000 claims abstract description 11
- 230000001172 regenerating effect Effects 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000011084 recovery Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000011449 brick Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002918 waste heat Substances 0.000 abstract 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 22
- 230000008569 process Effects 0.000 description 12
- 230000002457 bidirectional effect Effects 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
本发明公开了一种两级蓄热的蓄热式加热炉烟气脱硝系统，属于工业窑炉节能环保技术领域。本发明的第一蓄热体和第二蓄热体，在生产时各自被分成蓄热体A和蓄热体B两个级，在两级之间通过阀门切换形成两支路，分别为直连回路和脱硝回路。烟气排放时烟气流经脱硝回路，烟气通过所述第一蓄热体A或第二蓄热体A，在SCR烟气脱硝装置进行脱硝，然后，再通过所述第一蓄热体B或第二蓄热体B进行余热回收；空气进入时为直连回路，空气先进入所述第一蓄热体B或第二蓄热体B，然后进入第一蓄热体A或第二蓄热体A，实现空气加热目的。本发明不仅能满足SCR烟气脱硝的温度要求，还能实现余热回收，且烟温控制难度低，适宜商业化。The invention discloses a two-stage heat storage regenerative heating furnace flue gas denitration system, belonging to the technical field of energy saving and environmental protection of industrial kiln. The first heat storage body and the second heat storage body of the present invention are respectively divided into two stages of a heat storage body A and a heat storage body B during production, and two branches are respectively formed by valve switching between the two stages, which are respectively straight Connect the loop and the denitration circuit. When the flue gas is discharged, the flue gas flows through the denitration circuit, and the flue gas passes through the first regenerator A or the second regenerator A, is denitrated in the SCR flue gas denitration device, and then passes through the first regenerator B or the second regenerator B performs waste heat recovery; when the air enters, it is a direct connection circuit, and the air first enters the first regenerator B or the second regenerator B, and then enters the first regenerator A or the second The regenerator A achieves the purpose of air heating. The invention not only can meet the temperature requirement of SCR flue gas denitration, but also realizes waste heat recovery, and the smoke temperature control is difficult and suitable for commercialization.
Description
Technical field
The present invention relates to one kind to be used for recuperative heater flue gas low pollution emission system, and in particular to a kind of two-stage accumulation of heat
Recuperative heater flue gas denitrification system, the system have unique flue gas air regenerative heat exchange implementation, can be by SCR
For recuperative heater, belong to Industrial Stoves technical field of energy saving and environmental protection.
Background technique
In recent years, haze weather is increasingly severe, serious to affect people's health.Haze weather Producing reason it
One is exactly that flue gas pollutant discharge in Industrial Stoves is exceeded, the problem of in order to administer this environment, requirement of the country to environmental protection
It is higher and higher, it is also lower and lower for the effluent standard amount of NOx.Smoke discharging residual heat is efficiently utilized in recuperative heater, reaches
Energy-efficient effect is used widely in Industrial Stoves field, but since pre-burning air is heated to high temperature by heat storage, burning fire
Flame temperature increases, so that the NOx generated in combustion process also becomes more, amount of nitrogen oxides increases the pollution increased to environment.
Therefore, it is necessary to deviate from the higher NOx of content in flue gas, it is conventional in view of smelting and heating fire box temperature higher than 1200 DEG C
Combustion control mode, it is difficult to control NOx content lower than 200mg/m3, it has to use flue-gas denitration process.
SCR is most mature gas denitrifying technology at present, it be under the effect of the catalyst, " selective " and flue gas
In NOXReaction, is reduced into nitrogen and water for the nitrogen oxides in boiler smoke, it is method of denitration after a kind of furnace, without pair
Product, does not form secondary pollution, and apparatus structure is simple.The optimal field of activity of SCR catalyst is at 300 ~ 400 DEG C, denitration efficiency
Up to 90% or more.A kind of removal device of the SCR equipment for denitrifying flue gas as NOx, key technology are after burning in flue gas
NOx be converted into other substances harmless to environment and human body, to reduce the yield of NOx.
Patent201810495274.0It is proposed a kind of coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN coupled with SNCR/SCR method of denitration with
Fume afterheat is utilized and is coupled with denitration technology by device, and process structure is simple and denitration efficiency is high, but it is only applicable to single storage
Hot body is arranged symmetrically recuperative heater heat storage, and air and flue gas interaction pass through, and the method proposed can not achieve
Working medium exchanges function.Patent201610973372.1Although being provided with SCR reactor between two groups of regenerative chambers, and by multiple
Another SCR heat exchanger of reversal valve is realized, and present invention employs multiple check valves and two SCR denitration devices, can not only keep away
Exempt from reversal valve seal failure problem, can also more guarantee the effect in each flue gas air heat-exchange circuit.
The characteristics of this technology is: first, being classified using heat storage, the exhaust gas temperature for solving general heat storage is
200 DEG C or so, it is difficult to realize the problem of the denitrating technique of SCR；Second, the heat storage being arranged symmetrically is controlled using unidirectional stop valve
Two branches guarantee cigarette wherein a branch arranges that SCR denitration process, two sets of SCR denitration processes can reduce the difficulty of fibre selection
The removal efficiency of NOx in gas；Third, setting checker brick for the heat storage material for recycling denitration fume afterheat, it is easily changed, reduces
The influence that moisture exchanges heat to regenerative chamber.
Summary of the invention
The present invention is quasi- to provide a kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat, for solving existing operation
The flue gas NOx of Industrial Stoves discharges high problem, is particularly suitable for recuperative heater.This technology method of denitration uses ammonia process
SCR denitration method using high temperature catalyst, and uses medicament ejector method.
The technical solution that the present invention specifically takes is as follows:
A kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat, it is characterised in that: the present apparatus is by first heat storage
It is divided into heat storage A and heat storage B two-stage with the second heat storage, and is tested and divided with 300 ~ 400 DEG C of exhaust gas temperature, in the storage
Two branches are formed by valve transfer between hot body A and heat storage B.Wherein, a branch is directly connected to, and SCR is added in another branch
Equipment for denitrifying flue gas.Flue gas carries out accumulation of heat cooling in the heat storage A, has carried out in the SCR equipment for denitrifying flue gas
After full denitration reaction, secondary accumulation of heat cooling is carried out in the heat storage B, heat recovery is thorough, and denitration reaction is outside burner hearth
It carries out, reaction in furnace is not impacted.
The heat storage B material selection checker brick accumulation of heat, convenient disassembly are easily replaced.
In the process of running, what the heat storage A was completed is when heating furnace operates normally to being arranged to described heat storage A, the B
Accumulation of heat of flue gas, into air secondary preheating, that the heat storage B is completed is two to flue gas after denitration process
Secondary accumulation of heat, into air primary preheating.
The SCR equipment for denitrifying flue gas is arranged between described heat storage A, B, within the scope of optimal reaction temperature, NOx
Removal efficiency is high.The generated water vapour of denitration reaction flows into the heat storage B, does not impact to reaction in furnace, reduces in furnace
Fouling.
Compared with the prior art, the advantages of the present invention are as follows:
1. being classified using heat storage, the exhaust gas temperature for solving general heat storage is 200 DEG C or so, it is difficult to realize that SCR's is de-
The problem of nitre technique；
2. the heat storage being arranged symmetrically controls two branches using unidirectional stop valve, wherein branch arrangement SCR denitration process, two
Set SCR denitration process can reduce the difficulty of fibre selection, guarantee the removal efficiency of NOx in flue gas
3. the generated water vapour of denitration reaction flows into the heat storage B, independent except burner hearth, and is checker brick material, it is easy to
Replacement, reduces the influence that moisture exchanges heat to regenerative chamber.
Detailed description of the invention
Fig. 1 is the recuperative heater flue gas denitrification system operation principle schematic diagram of two-stage accumulation of heat of the invention.
Marginal data
1, air-blaster；2, air intake duct；3, four-way reversing valve；4, the first heat storage B；5, SCR denitration device is 1.；6,
One heat storage A；7, preheating chamber one；8, the first gas inlet pipe；9, the first burner；10, the first gas control valve；11, the second combustion
Gas control valve；12, the second burner；13, the second gas inlet pipe；14, preheating chamber two；15, the second heat storage A；16, SCR denitration
Device is 2.；17, the second heat storage B；18, smoke discharging pipe；19, air-introduced machine；20, chimney；21, burner hearth；22, the first heat storage；23,
Second heat storage.
Specific embodiment
Below with reference to specific example, the present invention will be further explained.
As shown in Figure 1, a kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat includes: the first heat storage A(6),
SCR equipment for denitrifying flue gas 1. (5), the first heat storage B(4), the first burner (9), preheating chamber one (7), the first gas inlet pipe
(8), the second heat storage A (15), SCR equipment for denitrifying flue gas 2. (16), the second heat storage B(17), the second burner (12), preheating
Room two (14), smoke exhaust pipe (18), air intake duct (2), the second gas inlet pipe (13).First heat storage (6,4) and the
Two heat storages (15,17), the first burner (9) and the second burner (12) are in a symmetrical arrangement, are arranged in the both ends of burner hearth (21),
Described two heat storages, two nozzle structures are identical, the first heat storage A(6) on be terminated with air flue gas bidirectional pipe,
This pipe meets the left end in four-way reversing valve (3), the first heat storage A(6) and four-way reversing valve (3) between be successively connected to SCR
Equipment for denitrifying flue gas 1. (5), the first heat storage B(4), 1. (5) and air flue gas bidirectional pipe be simultaneously for the SCR equipment for denitrifying flue gas
Connection, and 7., 8. the whole story end of the SCR equipment for denitrifying flue gas 1. (5) is connected to control valve respectively, the air at the parallel transistor
Flue gas bidirectional pipe connect there are two control valve 5., 6., for switching the discharge and inflow of flue gas and air, the first heat storage B
(4) connect on the left of in the right side of the SCR equipment for denitrifying flue gas 1. (5), the first heat storage B(4) on the right side of connect described
The left side of four-way reversing valve (3) is terminated with air intake duct (2), the air intake duct under the four-way reversing valve (3)
(2) beginning is equipped with air-blaster (1).The first heat storage A(6) lower end is connected with preheating chamber one (7), the first burner
(9) inlet is connected to the first gas inlet pipe (8), is equipped with the first gas control valve (10) at fuel gas inlet.Second accumulation of heat
Body A(15) on be terminated with air flue gas bidirectional pipe, this pipe meets the right end in the four-way reversing valve (3), the second heat storage A
(15) SCR equipment for denitrifying flue gas 2. (16), the second heat storage B(17 are successively connected between four-way reversing valve (3)), the SCR
Equipment for denitrifying flue gas is 2. (16) in parallel with air flue gas bidirectional pipe, and the whole story end of the SCR equipment for denitrifying flue gas 2. (16)
Be connected to control valve 10., the air flue gas bidirectional pipe at the parallel transistor connect there are two control valve 9., for switching flue gas
With connect on the right side of the discharge and inflow of air, the second heat storage B(17) on a left side for the SCR equipment for denitrifying flue gas 2. (16)
Side, the second heat storage B(17) on the left of connect on the right side of the four-way reversing valve (3), the four-way reversing valve (3) it is upper
It is terminated with smoke exhaust pipe (18), smoke exhaust pipe (18) end is equipped with air-introduced machine (19).The second heat storage A(15) lower end and pre-
Hot cell two (14) is connected, and the second burner (12) inlet is connected to the second gas inlet pipe (13), and second is equipped at fuel gas inlet
Gas control valve (11).
As preferred embodiment, the first heat storage A(6) and four-way reversing valve (3) between be successively connected to SCR cigarette
Gas denitrification apparatus 1. (5), the first heat storage B(4), the second heat storage A(15) and four-way reversing valve (3) between be successively connected to
SCR equipment for denitrifying flue gas 2. (16), the second heat storage B(17), the heat storage is arranged symmetrically, using unidirectional stop valve control two
Branch a, wherein branch arranges that SCR denitration process, two sets SCR denitration processes can reduce the difficulty of fibre selection, guarantee flue gas
The removal efficiency of middle NOx；The heat storage is classified, the exhaust gas temperature for solving general heat storage is 200 DEG C or so, it is difficult to real
The problem of the denitrating technique of existing SCR；The heat storage B(4,17) it burner hearth except is independently connected, denitration reaction generates moisture not
It influences reaction in furnace, and the heat storage B(4,17) is checker brick material, fouling easily replaces.
Working principle: the present invention is lighted a fire with the first burner, introduces principle, first the first combustion gas for the smoke evacuation of the second burner
Control valve (10) is opened, and the second gas control valve (11) is closed, while rotating four-way reversing valve (3), make valve port 3. with valve port 4.
In smoke evacuation state, at this time 1. 2. valve port is in air-suction state with valve port.Air imported into air inlet by air-blaster (1)
Manage (2), 1. 2. the first heat storage B(4 is entered with valve port by valve port), in the first heat storage B(4) at carry out first time preheating,
Open valve 5., 6., close valve 7., 8., connect air intake duct, thus enter the first heat storage A(6), in the first accumulation of heat
Body A(6) at carry out second and preheat, the air after preheating enters at preheating chamber one (7), be connected to simultaneously herein the first burner (9),
First fuel gas conduit (10) carries out the mixing of high temperature air, combustion gas at preheating chamber one (7), forms the condition of igniting, burning knot
Flue gas after beam is flowed out from the second heat storage A(15), by the heat storage of flue gas into the second heat storage A(15), to preheat down
Air when one wheel burning, to reach energy-efficient effect, flue gas flows out the second heat storage A(15) after, temperature is down to 300 ~
400 DEG C, at this time Open valve 10., close valve 9., flue gas is passed through SCR equipment for denitrifying flue gas 2. (16), in SCR cigarette
2. gas denitrification apparatus efficiently removes the NOx in flue gas, the chemical reaction being related at (16) are as follows:
4NO+4NH3+O2 →4N2+6H2O
2NO2+4NH3+O2 →3N2+6H2O
Flue gas after the completion of denitration is passed through the second heat storage B(17), the recycling of after-heat is carried out, 3. and valve port by valve port
4. flue gas is discharged from smoke exhaust pipe (18), finally flows to atmosphere by chimney (20) through air-introduced machine (19).This is wheel circulation,
Two burner alternate runs when operation make full use of fume afterheat to carry out air preheat and denitration process.
Described above is only the basic embodiment of invention, it should be pointed out that: all within the spirits and principles of the present invention, no
Under the premise of being detached from the principle of the invention, several improvements and modifications made also should be regarded as protection scope of the present invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811413023.XA CN109260947A (en) | 2018-11-26 | 2018-11-26 | A kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811413023.XA CN109260947A (en) | 2018-11-26 | 2018-11-26 | A kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat |
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| Publication Number | Publication Date |
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| CN109260947A true CN109260947A (en) | 2019-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811413023.XA Pending CN109260947A (en) | 2018-11-26 | 2018-11-26 | A kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111214953A (en) * | 2020-03-18 | 2020-06-02 | 长沙华时捷环保科技发展股份有限公司 | Heat accumulating type SCR denitration technology and system for wet desulfurization flue gas |
| CN115077285A (en) * | 2022-07-27 | 2022-09-20 | 南通京阳机械科技有限公司 | Energy-saving boiler flue gas waste heat absorption device |
| CN115468430A (en) * | 2022-09-05 | 2022-12-13 | 山东钢铁集团日照有限公司 | Single heat accumulating type heating furnace gas treatment device and gas treatment method |
| CN115654530A (en) * | 2022-10-28 | 2023-01-31 | 安徽省凤形新材料科技有限公司 | A heating furnace with a regenerative burner |
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| CN101435575A (en) * | 2008-12-02 | 2009-05-20 | 北京交通大学 | Thermal storage type natural gas boiler system for combustion selective catalytic reduction flue gas denitration |
| JP2013139966A (en) * | 2012-01-05 | 2013-07-18 | Nippon Steel & Sumitomo Metal Corp | Method and device for automatically controlling nox in heating furnace |
| CN106731555A (en) * | 2016-12-26 | 2017-05-31 | 北京神雾环境能源科技集团股份有限公司 | Industrial kiln gas accumulation of heat denitrification apparatus and method of denitration |
| CN108613182A (en) * | 2018-07-09 | 2018-10-02 | 河北科技大学 | A kind of double injection low nitrogen burning systems of recuperative heater |
| CN209221872U (en) * | 2018-11-26 | 2019-08-09 | 河北科技大学 | A kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat |
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| CN101435575A (en) * | 2008-12-02 | 2009-05-20 | 北京交通大学 | Thermal storage type natural gas boiler system for combustion selective catalytic reduction flue gas denitration |
| JP2013139966A (en) * | 2012-01-05 | 2013-07-18 | Nippon Steel & Sumitomo Metal Corp | Method and device for automatically controlling nox in heating furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111214953A (en) * | 2020-03-18 | 2020-06-02 | 长沙华时捷环保科技发展股份有限公司 | Heat accumulating type SCR denitration technology and system for wet desulfurization flue gas |
| CN115077285A (en) * | 2022-07-27 | 2022-09-20 | 南通京阳机械科技有限公司 | Energy-saving boiler flue gas waste heat absorption device |
| CN115468430A (en) * | 2022-09-05 | 2022-12-13 | 山东钢铁集团日照有限公司 | Single heat accumulating type heating furnace gas treatment device and gas treatment method |
| CN115654530A (en) * | 2022-10-28 | 2023-01-31 | 安徽省凤形新材料科技有限公司 | A heating furnace with a regenerative burner |
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