CN210568367U - Low-nitrogen biomass hot blast stove base and hot blast stove - Google Patents
Low-nitrogen biomass hot blast stove base and hot blast stove Download PDFInfo
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- CN210568367U CN210568367U CN202020115803.2U CN202020115803U CN210568367U CN 210568367 U CN210568367 U CN 210568367U CN 202020115803 U CN202020115803 U CN 202020115803U CN 210568367 U CN210568367 U CN 210568367U
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Abstract
The utility model discloses a low nitrogen living beings hot-blast furnace base and hot-blast furnace relates to industrial boiler, biomass fuel burning technical field. The utility model discloses a low-nitrogen biomass hot blast stove base, which comprises a biomass fuel feeding device, an air box, a grate which is positioned at the lower side of the feeding device and used for conveying biomass fuel and supplying the biomass fuel for combustion, and a recirculation flue gas inlet, wherein the recirculation flue gas inlet is used for introducing recirculation flue gas between a material combustion part and the feeding device; reduce the generation and the emission of nitrogen oxides and protect a feeding device.
Description
Technical Field
The utility model belongs to the technical field of industrial boiler, biomass fuel burning, especially, relate to a low nitrogen living beings hot-blast furnace base.
Background
The hot blast stove is widely applied to drying operation of grains and the like, and fuel mainly comprises coal. The problem of substandard environmental emission generally exists. In order to meet the requirement of environmental emission, enterprises also install environmental protection facilities and bear larger economic pressure. The biomass fuel has the advantages of itself as a renewable energy source, the sulfur content of the fuel is low, the fuel does not need to be subjected to desulfurization treatment after combustion, and the discharge amount of nitrogen oxides can be effectively controlled by adopting a scientific and reasonable low-nitrogen combustion technology. In order to meet the stricter and stricter environmental requirements and meet the environmental standards and the enterprise operation cost, the biomass hot blast stove using coal instead of fuel is the development trend of the hot blast stove in the future.
However, the existing biomass hot blast stove using coal instead of fuel is slightly modified in structure of the original coal-fired stove, the nitrogen reduction effect is not obvious, the problem that the emission of nitrogen oxides in flue gas exceeds standard still exists, and the market popularization of the biomass hot blast stove is restricted.
The existing biomass hot blast stove is basically based on simple transformation of the original coal-fired stove, and adopts a traditional coal adiabatic combustion method, and the combustion form is relatively extensive. In order to reduce the temperature of the flue gas to meet the requirement of subsequent drying, cold air is introduced into the furnace, so that the oxygen content in the flue gas is greatly increased, the conversion value of the emission concentration of the flue gas pollutants is increased, and the emission of nitrogen oxides does not reach the standard.
And when the biomass fuel is combusted, because the fuel is continuously supplied, fire can spread to the feeding device, and accidents or shutdown can be caused.
The biomass hot blast stove base and the hot blast stove do not exist in the prior art, and the problems can be solved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a low-nitrogen biomass hot blast stove base and hot blast stove, which mainly aims to solve the problem of NO in the prior artxThe production amount is high and the feeding device is easy to burn.
In order to solve the technical problem, the embodiment of the utility model provides a low-nitrogen living beings hot-blast furnace base, including biomass fuel's feeder, bellows and be located the grate that the feeder downside transported biomass fuel and supplied biomass fuel to burn, still include the recirculation flue gas entry, the recirculation flue gas entry lets in the recirculation flue gas between material burning department and the feeder.
Optionally, the grate corresponds to a blanking position of the biomass fuel right below the feeding device, and a recirculation flue gas inlet is arranged between the material combustion position and the blanking position.
Optionally, the system further comprises a furnace door, a material ignition part is arranged above the furnace door corresponding to the furnace door, and a recirculation flue gas inlet is arranged between the material ignition part and the blanking part.
Optionally, the recirculated flue gas inlet and the wind box are both located at a lower side of a fire bed area, and the fire bed area is located above the fire grate.
Optionally, the fire bed further comprises CO arranged at the lower side of the fire bed area2And an air injection device. The recirculated flue gas inlet, the windbox and the CO2The air injection device only needs to act on the fire bed area, provides proper oxygen, and simultaneously reduces the temperature and produces reducing atmosphere.
Optionally, the grate is a chain grate and comprises an upper chain and a lower chain, biomass fuel is combusted above the upper chain, and the recycled flue gas inlet is located on the lower side of the upper chain.
Optionally, the air box is arranged on the lower side of the chain on the grate, and oxygen-containing air is blown upwards by the air box.
Optionally, the grate further comprises a CO arranged on the lower side of the upper chain of the grate2And an air injection device.
The CO is2The air injection device is arranged on theAnd the air box is arranged inside the air box. The CO is2The air injection device and the air box simultaneously introduce air into a fire bed area and a main combustion area above the fire grate to act on a fuel combustion position.
The utility model also discloses a hot-blast furnace, including arbitrary low nitrogen living beings hot-blast furnace base in the above-mentioned scheme.
Optionally, the hot blast stove further comprises a slag heating device arranged in front of the heat exchange device.
The utility model discloses following beneficial effect has been gained: the utility model provides a hot blast stove base, including the recirculated flue gas entry, the recirculated flue gas entry lets in the recirculated flue gas between material burning department and the feeder, the recirculated flue gas is the flue gas that discharges out through the boiler afterbody of heat exchange, and is lower compared with the inside flue gas temperature of boiler, the oxygen content is lower, volatile content is lower, can play the effect of reducing the temperature of mixed flue gas, avoids causing the damage to tubular heat transfer surface because the temperature is too high; reducing the generation of thermal nitrogen; meanwhile, residual oxygen in the flue gas participates in combustion again in the circulating process, so that the effect of reducing the oxygen content of tail flue gas is achieved, and the converted concentration of each pollutant emission is correspondingly reduced.
Meanwhile, because the recirculated flue gas is introduced between the material combustion position and the feeding device, the oxygen content of the recirculated flue gas is low, flame is prevented from spreading to the feeding device, a relatively oxygen-free environment is created for the feeding device, accidents caused by ignition of the feeding device are effectively avoided, and fuel waste is also avoided.
The utility model provides a coking phenomenon when hot-blast furnace, can effectually avoid the fuel burning reduces nitrogen oxide's formation and emission simultaneously.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention unduly. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of a base of a low-nitrogen biomass hot-blast stove of the present invention.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
The present application will be described in further detail below with reference to the accompanying drawings, but the present application is not limited thereto.
As shown in fig. 1 the utility model discloses a structural schematic diagram of an embodiment of low-nitrogen living beings hot-blast furnace base is shown, the embodiment of the utility model provides a low-nitrogen living beings hot-blast furnace base, this low-nitrogen living beings hot-blast furnace base include biomass fuel's feeder 1, bellows 2 and lie in feeder 1 downside and transport biomass fuel and supply the grate 3 of biomass fuel burning.
In some embodiments, the low-nitrogen biomass hot blast stove base further comprises a recirculated flue gas inlet 4, and the recirculated flue gas inlet 4 feeds recirculated flue gas between the material combustion site and the feeding device 1.
In the embodiment of the application, the recirculated flue gas is subjected to processes such as dust removal and the like, compared with the flue gas in the boiler, such as low temperature, low oxygen content and low volatile content, the recirculated flue gas can play a role in reducing the temperature of the mixed flue gas, and the damage to the tubular heat exchange surface caused by too high temperature is avoided; reducing the generation of thermal nitrogen; meanwhile, residual oxygen in the flue gas participates in combustion again in the circulating process, so that the effect of reducing the oxygen content of the tail flue gas is achieved, the original oxygen content of the boiler flue gas is reduced, and the emission reduced concentration of each pollutant is correspondingly reduced.
The formula I is as follows:
in the formula:
rho-atmospheric pollutant reference oxygen content emission concentration, mg/m3；
Rho' -measured emission concentration of atmospheric pollutants, mg/m3；
Meanwhile, because the recirculated flue gas is introduced between the material combustion position and the feeding device 1, the oxygen content of the recirculated flue gas is low, flame is prevented from spreading to the feeding device 1, a relatively oxygen-free environment is created for the feeding device 1, accidents caused by ignition of the feeding device 1 are effectively avoided, and fuel waste is also avoided.
In some embodiments of the present invention, the grate 3 is located under the feeding device 1 and is a blanking portion 5 of biomass fuel, and a recirculation flue gas inlet 4 is provided between the material combustion portion and the blanking portion 5.
When the device works, fuel falls on a blanking part above a fire grate 3 from a feeding device 1 and then is conveyed to a fire bed area from the fire grate 3, the fuel is ignited and starts to burn under the action of oxygen blown by an air box 2, because a recirculation flue gas inlet 4 is arranged between a material burning part and the blanking part, one side of the recirculation flue gas inlet 4 is a material burning part, and the other side of the recirculation flue gas inlet 4 is the feeding device 1 or the blanking part 5, because the oxygen content of the recirculation flue gas is low, flame is prevented from spreading to the feeding device 1 or the blanking part 5, a relatively anaerobic environment is created for the feeding device 1, a relatively anaerobic environment is created, accidents caused by the fact that the feeding device 1 is ignited are effectively avoided, and fuel waste is also avoided.
The utility model discloses an in some embodiments, low nitrogen living beings hot-blast furnace base still includes furnace gate 6, and the grate top that furnace gate 6 corresponds is the material department of igniteing, is provided with recirculation flue gas entry 4 between material department of igniteing and this blanking department 5.
In some embodiments, the recirculated flue gas inlet 4, the wind box 2 are both located on the underside of the fire bed area, which is located above the fire grate 3. The material burning part comprises a fire bed area and a volatile matter burning area positioned at the upper part of the fire bed area. The recirculated flue gas inlet 4 blows in recirculated flue gas from below the fire bed area, directly acts on the fire bed area and the combustion position above the fire bed area, and better realizes the effect of cooling, dilution oxygen. An air box 2 blows oxygen-containing air from the lower part of the fire bed area to provide necessary oxygen for the combustion of fixed carbon on the fire grate 3 and the combustion of volatile matters on the upper part of the fire bed area.
In other embodiments of the present invention, the grate 3 is a chain grate, which includes an upper chain and a lower chain, the biomass fuel is burned above the upper chain, and the recycling flue gas inlet 4 is located on the lower side of the upper chain. The recycling flue gas inlet 4 is arranged between the upper chain and the lower chain, so that the space is saved.
In other embodiments of the present invention, the bellows 2 is disposed on the lower side of the chain on the grate 3, and the bellows 2 blows in the oxygen-containing wind upwards.
In other embodiments of the present invention, the base of the low-nitrogen biomass hot-blast stove further comprises a CO disposed on the lower side of the chain on the grate 32And an air injection device 6.
In other embodiments of the present invention, CO2The air injection device 6 is arranged in the wind box 2. CO 22The gas injection device 6 and the bellows 2 simultaneously introduce gas into a fire bed area and a main combustion area above the fire grate 3 to act on a fuel combustion position.
In other embodiments of the present invention, CO2The gas injection device 6 and the air box simultaneously introduce gas into a fire bed area and a main combustion area above the fire grate to act on a fuel combustion position.
In other embodiments of the present invention, CO2The gas injection device 6 is CO2A pulse gas nozzle inThe bottom is combined with the air box 2 and is internally provided with CO2Pulsed gas injection tube, through CO2Reduction reaction with fixed carbon:
C+CO2↑—CO↑-Q
according to the anaerobic combustion principle, reducing atmosphere is generated on the fuel bed to reduce the temperature of the fuel layer, which creates a prerequisite condition for reducing NO generation in the initial stage of biomass fuel combustion and is beneficial to reducing NO in the whole operation processxAnd (4) generating.
Example two: the utility model also discloses a hot-blast furnace, including any one low nitrogen living beings hot-blast furnace base in the above-mentioned scheme. The hot blast stove has the technical effects in the embodiment of the low-nitrogen biomass hot blast stove base.
In some embodiments, the hot blast stove further comprises a slag heating device arranged in front of the heat exchange device. Outside having all effects of above-mentioned base, the hot-blast furnace is provided with the sediment device that congeals, including the shell with set up in the inside condensation pipe of shell, the shell includes flue gas entry and exhanst gas outlet, the condensation pipe is located between flue gas entry and exhanst gas outlet, the inside heat transfer cold source that is provided with of condensation pipe. Effectively avoid the subsequent heating device of fusibility ash blocking, effectually solved the problem that the flue gas escape among the prior art, the slag setting effect is not good and difficult clearance.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. The utility model provides a low nitrogen living beings hot-blast furnace base, its characterized in that includes biomass fuel's feeder, bellows and is located the grate that the feeder downside transported biomass fuel and supplied biomass fuel burning, still includes recirculation flue gas entry, recirculation flue gas entry lets in the recirculation flue gas between material burning department and the feeder.
2. The low-nitrogen biomass hot-blast stove base according to claim 1, wherein the fire grate corresponds to a blanking position of biomass fuel right below the feeding device, and a recirculation flue gas inlet is arranged between a material combustion position and the blanking position.
3. The low-nitrogen biomass hot-blast stove base according to claim 1, further comprising a stove door, a material ignition part is arranged above the fire grate corresponding to the stove door, and a recirculation flue gas inlet is arranged between the material ignition part and the blanking part.
4. The low-nitrogen biomass hot blast stove base according to claim 1, wherein the recirculated flue gas inlet and the wind box are both located at a lower side of a fire bed region, which is located above a fire grate.
5. The low-nitrogen biomass hot blast stove base according to claim 1, further comprising CO disposed at a lower side of the fire bed area2And an air injection device.
6. The low-nitrogen biomass hot blast stove base according to claim 1, wherein the grate is a chain grate comprising an upper chain and a lower chain, biomass fuel is combusted above the upper chain, and the recirculated flue gas inlet is located at a lower side of the upper chain.
7. The low-nitrogen biomass hot blast stove base according to claim 6, wherein the wind box is provided on the lower side of the grate bars, and blows oxygen-containing wind upwards.
8. The low-nitrogen biomass hot blast stove base according to claim 6, further comprising a C arranged on the lower side of the grate upper chainO2And an air injection device.
9. A hot blast stove characterized by comprising a low nitrogen biomass hot blast stove base according to any one of claims 1 to 8.
10. The hot blast stove according to claim 9, further comprising a slag heating device arranged in front of the heat exchange device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020115803.2U CN210568367U (en) | 2020-01-16 | 2020-01-16 | Low-nitrogen biomass hot blast stove base and hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020115803.2U CN210568367U (en) | 2020-01-16 | 2020-01-16 | Low-nitrogen biomass hot blast stove base and hot blast stove |
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| Publication Number | Publication Date |
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| CN210568367U true CN210568367U (en) | 2020-05-19 |
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| CN202020115803.2U Active CN210568367U (en) | 2020-01-16 | 2020-01-16 | Low-nitrogen biomass hot blast stove base and hot blast stove |
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