CN209221872U - 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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- CN209221872U CN209221872U CN201821947828.8U CN201821947828U CN209221872U CN 209221872 U CN209221872 U CN 209221872U CN 201821947828 U CN201821947828 U CN 201821947828U CN 209221872 U CN209221872 U CN 209221872U
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Abstract
The utility model discloses a kind of recuperative heater flue gas denitrification systems of two-stage accumulation of heat, belong to Industrial Stoves technical field of energy saving and environmental protection.First heat storage and the second heat storage of the utility model are divided into two grades of A, B in production, form two branches by valve transfer between two-stage, and a branch is directly connected to, and SCR equipment for denitrifying flue gas is added in another branch.When flue gas emission, flue gas carries out denitration by SCR equipment for denitrifying flue gas branch, then carries out waste heat recycling by the first heat storage B or the second heat storage B；When air enters, air is introduced into the first heat storage B or the second heat storage B, subsequently into the first heat storage A or the second heat storage A, realizes the purpose using heat storage heating air.The utility model is not only able to satisfy the temperature requirement of SCR denitrating flue gas, moreover it is possible to realize that waste heat recycles, and fibre selection difficulty is low, be suitable for commercialization.
Description
Technical field
The utility model 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
The recuperative heater flue gas denitrification system of accumulation of heat, the system have unique flue gas air regenerative heat exchange implementation, can
SCR is used for recuperative heater, belongs 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 the utility model uses multiple check valves and two SCR denitration devices, not only
It can avoid 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 utility model is quasi- to provide a kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat, for solving existing fortune
The flue gas NOx of capable Industrial Stoves discharges high problem, is particularly suitable for recuperative heater.This technology method of denitration uses ammonia
Method SCR denitration method using high temperature catalyst, and uses medicament ejector method.
The technical solution that the utility model is specifically taken 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 stored described first
Hot body and the second heat storage are divided into heat storage A and heat storage B two-stage, and are tested and divided with 300 ~ 400 DEG C of exhaust gas temperature, in institute
It states and two branches is formed by valve transfer between heat storage A and heat storage B.Wherein, a branch is directly connected to, and another branch is added
SCR equipment for denitrifying flue gas.Flue gas carries out accumulation of heat cooling in the heat storage A, carries out in the SCR equipment for denitrifying flue gas
After complete denitration reaction, secondary accumulation of heat cooling is carried out in the heat storage B, heat recovery is thorough, and denitration reaction is in burner hearth
Outer progress does not impact reaction in furnace.
The heat storage B material selection checker brick accumulation of heat, convenient disassembly, Yi Genghuan.
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 vapor 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 utility model are:
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 SCR
Denitrating technique problem；
2. the heat storage being arranged symmetrically controls two branches using unidirectional stop valve, wherein a branch arranges SCR denitration work
Skill, two sets of SCR denitration processes can reduce the difficulty of fibre selection, guarantee the removal efficiency of NOx in flue gas
3. the generated vapor of denitration reaction flows into the heat storage B, independent except burner hearth, and is checker brick material,
It is easily changed, 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 the two-stage accumulation of heat of the utility model.
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, the first heat storage A；7, preheating chamber one；8, the first gas inlet pipe；9, the first burner；10, the first gas control valve；11,
Two gas control valves；12, the second burner；13, the second gas inlet pipe；14, preheating chamber two；15, the second heat storage A；16,SCR
Denitrification apparatus is 2.；17, the second heat storage B；18, smoke discharging pipe；19, air-introduced machine；20, chimney；21, burner hearth；22, the first accumulation of heat
Body；23, the second heat storage.
Specific embodiment
The utility model is further described below with reference to specific example.
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 utility model is lighted a fire with the first burner, introduces principle, first first for the smoke evacuation of the second burner
Gas control valve (10) is opened, and the second gas control valve (11) is closed, while rotating four-way reversing valve (3), makes valve port 3. and valve
4. mouth is in smoke evacuation state, at this time 1. 2. valve port is in air-suction state with valve port.Air imported into air by air-blaster (1)
1. 2. air inlet pipe (2) enters the first heat storage B(4 by valve port with valve port), in the first heat storage B(4) at carry out for the first time it is pre-
5., 6. heat opens valve, close valve 7., 8., connects air intake duct, thus enters the first heat storage A(6), it is stored first
Hot body A(6) at carry out second and preheat, the air after preheating enters at preheating chamber one (7), is connected to the first burner simultaneously herein
(9), the first fuel gas conduit (10) carry out the mixing of high temperature air, combustion gas, form the condition of igniting at preheating chamber one (7), fire
Flue gas after burning is flowed out from the second heat storage A(15), by the heat storage of flue gas into the second heat storage A(15), is come pre-
Air when hot next round is burnt, 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),
2. SCR equipment for denitrifying flue gas 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 by valve port
4. mouth, through air-introduced machine (19), is discharged flue gas from smoke exhaust pipe (18), finally flows to atmosphere by chimney (20).This is a repeating query
Ring, two burner alternate runs when operation make full use of fume afterheat to carry out air preheat and denitration process.
The above is only the basic embodiment of utility model, it should be pointed out that: all spirit and original in the utility model
Within then, under the premise of not departing from the utility model principle, several improvements and modifications made also should be regarded as the utility model
Protection scope.
Claims (4)
1. a kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat, the flue gas denitrification system include: the first accumulation of heat
Body A(6), the first heat storage B(4), the first burner (9), the second heat storage A(15) and, the second heat storage B(17), the second burner
(12), preheating chamber one (7), preheating chamber two (14), 1. (5), SCR equipment for denitrifying flue gas be 2. (16) for SCR equipment for denitrifying flue gas；It is described
First heat storage A(6) and the first heat storage B(4) it is an entire heat storage with 300 ~ 400 DEG C of exhaust gas temperature two divided
Part, first heat storage (22) is identical as the second heat storage (23) structure and is arranged symmetrically；First burner (9) and
Two burners (12) structure is identical and uses in pairs, and the SCR equipment for denitrifying flue gas 1. 2. (16) tie by (5), SCR equipment for denitrifying flue gas
Structure is identical and is arranged symmetrically, and is separately mounted between heat storage A and heat storage B；It is characterized by: first heat storage (22)
It is divided into heat storage A and heat storage B two-stage with the second heat storage (23), and is tested and divided with 300 ~ 400 DEG C of exhaust gas temperature, it is described
Two branches are formed by valve transfer between heat storage A and heat storage B, wherein a branch is directly connected to, and another branch is added
SCR equipment for denitrifying flue gas, flue gas carry out accumulation of heat cooling in the heat storage A, carry out in the SCR equipment for denitrifying flue gas
After complete denitration reaction, carry out secondary accumulation of heat cooling in the heat storage B, heat recovery is thorough, and denitration reaction independently of
Outside furnace, the influence of moisture in furnace is reduced.
2. a kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat according to claim 1, it is characterised in that: will
First heat storage (22) and the second heat storage (23) use two stage arrangement, respectively heat storage A and heat storage B, two-stage cloth
The flue-gas temperature set is between 300 ~ 400 DEG C.
3. a kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat according to claim 1, it is characterised in that: will
First heat storage (22) and the second heat storage (23) use two stage arrangement, form two by valve transfer between two-stage
Road, a branch are directly connected to, and another branch is added SCR equipment for denitrifying flue gas, and when flue gas emission, flue gas passes through SCR denitrating flue gas
Device branch carries out denitration；When air enters, air is introduced into the first heat storage B(4) or the second heat storage B(17), so
Enter the first heat storage A(6 afterwards) or the second heat storage A(15), realize the purpose using heat storage heating air.
4. a kind of recuperative heater flue gas denitrification system of two-stage accumulation of heat according to claim 1, it is characterised in that: institute
It states that heat storage B(4,17) material is checker brick, is easily changed, after the completion of denitration reaction, nitrogen and water that flue gas and denitration generate
Into heat storage B(4,17), water vapor adsorption flue gas particle depends on wall surface and forms dirt, influences to exchange heat, using being easily changed
Checker brick material, it can be achieved that reduce vapor influence purpose.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821947828.8U CN209221872U (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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821947828.8U CN209221872U (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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| CN209221872U true CN209221872U (en) | 2019-08-09 |
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| CN201821947828.8U Expired - Fee Related CN209221872U (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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109260947A (en) * | 2018-11-26 | 2019-01-25 | 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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2018
- 2018-11-26 CN CN201821947828.8U patent/CN209221872U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109260947A (en) * | 2018-11-26 | 2019-01-25 | 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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Granted publication date: 20190809 Termination date: 20201126 |