CN212108479U - Boiler system capable of reducing NOX emission - Google Patents
Boiler system capable of reducing NOX emission Download PDFInfo
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- CN212108479U CN212108479U CN202020412788.8U CN202020412788U CN212108479U CN 212108479 U CN212108479 U CN 212108479U CN 202020412788 U CN202020412788 U CN 202020412788U CN 212108479 U CN212108479 U CN 212108479U
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- boiler
- cyclone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a reduce boiler system of NOX emission relates to the environmental equipment field, including boiler, cyclone, air heater, dust remover, chimney, the boiler bottom is equipped with the water-cooling plenum, the switch-on of boiler top cyclone, the cyclone bottom is equipped with the feed back valve, and feed back valve one end is put through to the boiler bottom, the cyclone top has connected gradually over heater, re-heater, economizer, the dust remover is followed after filtering the waste gas that the boiler produced the chimney discharges, be equipped with the draught fan between dust remover and the chimney, make the volume of wasting discharge increase, the utility model discloses reduce reduction zone oxygen concentration, improve reducing atmosphere, reduce the formation volume of NOx from the source, through the amount of wind of adjusting, prevent excessive oxygen, reduce NOx and generate.
Description
Technical Field
The utility model relates to an environmental equipment field especially relates to a reduce boiler system of NOX emission.
Background
The nitrogen oxides cause the badness to the health and the ecological environment of human beingsThe influence of (c). Low concentration of nitrogen oxide can produce stimulation to human eyes and respiratory system, and high concentration of nitrogen oxide can cause respiratory diseases such as asthma and paralysis of nervous system. Nitrogen oxides are also one of the causes of greenhouse effect, ozone holes, acid rain and photochemical pollution. In this respect, the national requirements on the pollutant emission of coal-fired generating sets are continuously improved, and the method is particularly important for the emission of nitrogen oxides in thermal power plants. The latest standard of 'emission standard of atmospheric pollutants for thermal power plants' is that the emission concentration of smoke dust, sulfur dioxide and nitrogen oxides is not higher than 10, 35 and 50mg/Nm3。
The main contents are as follows: (1) and (3) oxygen-deficient combustion technology in the furnace. It is known that nitrogen oxides entering a boiler coal combustion reaction mainly participate in the reaction as follows:
(N) + 02→ NOx(2-1)
NOx + C02 → N2 + C02(2-2)
as can be seen from (2-1) and (2-2) in the above formula, NOx is less generated in a reducing atmosphere with a small amount of 02. In addition, the nitrogen organic compounds in combustion are mainly present in the form of NH3 and HCN during pyrolysis, reflected with O2 as follows:
12HCN + 2102→ 12NO + 12C02 + 6H20（2-3）
4HCN + 502→ 2N2 + 4C02 + 2H20（2-4）
as can be seen from the above equations (2-3) and (2-4), excess oxygen generates NO, and an increase in the 02 concentration increases the conversion of N to NOx, and thus the amount of NOx emitted. Under anoxic conditions, HCN ultimately forms N2. Therefore, the oxygen-deficient combustion technology in the dense-phase zone is developed, the oxygen concentration in the reduction zone is reduced, the reducing atmosphere is improved, and the generation amount of NOx is reduced from the source. The layered oxygen distribution technology is adopted to ensure that oxygen distribution in the vertical direction in the boiler is layered, the air quantity in the boiler can be reasonably distributed, the bottom fluidized air quantity is reduced, the middle part of the boiler generates a strong cyclone effect, the penetrating power of secondary air is enhanced, and unreasonable oxygen-enriched areas and oxygen-deficient areas are eliminated. Therefore, the combustion environment in the furnace is optimized, NOx generation can be reduced on the basis of full combustion, the carbon content of ash is reduced, and the boiler efficiency is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art, the utility model adopts the following technical scheme:
the utility model provides a reduce boiler system of NOX emission, is including boiler, cyclone, air heater, dust remover, chimney, the boiler bottom is equipped with the water-cooling plenum, the switch-on of boiler top cyclone, the cyclone bottom is equipped with the feed back valve, and feed back valve one end is put through to the boiler bottom, cyclone top has connected gradually over heater, re-heater, economizer, the dust remover is followed after filtering the waste gas that the boiler produced the chimney is discharged.
According to the technical scheme, the induced draft fan is arranged between the dust remover and the chimney, so that waste gas is discharged more smoothly.
According to the further technical scheme, the air preheater is provided with two pipelines, one pipeline is connected to the middle part of the boiler, and the other pipeline is connected to the water-cooling air chamber.
According to the further technical scheme, the other end of a pipeline connected to the middle part of the boiler is connected with a secondary fan, and the other end of the pipeline connected to the water-cooling air chamber is connected with a primary fan.
According to the further technical scheme, the boiler is further provided with a cold slag air inlet, and the cold slag air inlet and a pipeline in the middle of the air preheater connecting the boiler are oppositely arranged, so that convection effect is generated by air in the boiler.
Compared with the prior art, the beneficial effects of the utility model are that:
the boiler is provided with a cold slag air inlet, the cold slag air inlet and a pipeline connected with the middle part of the boiler by an air preheater are oppositely arranged, so that the air in the boiler generates a convection effect, the oxygen distribution in the boiler in the vertical direction is layered, the air quantity in the boiler can be reasonably distributed, the fluidized air quantity at the bottom is reduced, a strong cyclone effect is generated in the middle part of the boiler, the penetrating power of secondary air is enhanced, an unreasonable oxygen-rich area and an oxygen-deficient area are eliminated, the upper part of the boiler is communicated with a cyclone separator, waste slag which is not burnt out enters the bottom of the boiler through a backflow valve for secondary combustion, a dust remover is arranged for filtering in order to prevent particles in combustion gas from being discharged into the air, and in order to increase the discharge speed, the discharge is more thorough, and an induced draft fan.
Drawings
FIG. 1 is a schematic view of a boiler system for reducing NOx emissions according to the present invention;
in the figure: 1 cyclone separator, 2 superheater, 2-1 reheater, 2-2 economizer, 3 chimney, 4 boiler, 5 water cooling air chamber, 6 air preheater, 7 dust remover, 8 secondary fan, 8-1 primary fan, 9 induced draft fan, 10 cold slag air inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1, a boiler system for reducing NOX emission comprises a boiler 4, a cyclone separator 1, an air preheater 6, a dust remover 7 and a chimney 3, wherein a water cooling air chamber 5 is arranged at the bottom of the boiler 4, the cyclone separator 1 is communicated above the boiler 4 to play a role of separating waste gas and waste residue in the boiler 4, a material return valve is arranged at the bottom of the cyclone separator 1, one end of the material return valve is communicated with the bottom of the boiler 4, a superheater 2, a reheater 2-1 and an economizer 2-2 are sequentially connected to the top of the cyclone separator 1, and the waste gas generated by the boiler 4 is filtered by the dust remover 7 and then discharged from the chimney 3.
In this embodiment, an induced draft fan 9 is arranged between the dust remover 7 and the chimney 4, so that the exhaust gas is more smooth.
In this embodiment, the air preheater 6 is divided into two pipelines, one of which is connected to the middle of the boiler 4, and the other is connected to the water-cooling air chamber 5.
In this embodiment, the other end of the pipeline connected to the middle of the boiler 4 is connected to the secondary air blower 8, and the other end of the pipeline connected to the water-cooled air chamber 5 is connected to the primary air blower 8-1.
In this embodiment, the boiler 4 is further provided with a cold slag air inlet 10, and the cold slag air inlet 10 and the air preheater 6 are oppositely arranged in a pipeline connecting the middle part of the boiler 4, so that convection effect is generated by air in the boiler.
In the above scheme, the boiler is provided with a cold slag air inlet, the cold slag air inlet and an air preheater are oppositely arranged on a pipeline connected with the middle part of the boiler, the air in the boiler generates a convection effect, the vertical direction oxygen distribution in the boiler is layered, the bottom fluidization air quantity is reduced, the middle part of the boiler generates a strong cyclone effect, the penetration force of secondary air is enhanced, an unreasonable oxygen-enriched area and an oxygen-deficient area are eliminated, the upper part of the boiler is communicated with a cyclone separator, waste residues which are not burnt out enter the bottom of the boiler through a backflow valve for secondary combustion, a dust remover is arranged for filtering in order to prevent particles in combustion gas from being discharged into the air, the discharge speed is increased, the discharge is more thorough, and an induced draft fan is also arranged between the dust remover and a chimney.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. The utility model provides a reduce boiler system of NOX emission, its characterized in that, including boiler, cyclone, air heater, dust remover, chimney, the boiler bottom is equipped with the water-cooling plenum, the switch-on of boiler top cyclone, the cyclone bottom is equipped with the feed back valve, and feed back valve one end switch-on is to the boiler bottom, the cyclone top has connected gradually over heater, re-heater, economizer, the dust remover is followed after filtering the waste gas that the boiler produced the chimney is discharged.
2. The boiler system for reducing the emission of NOx of claim 1, wherein an induced draft fan is arranged between the dust remover and the chimney, so that the exhaust gas is discharged more smoothly.
3. The boiler system for reducing the emission of NOx of claim 1, wherein the air preheater is divided into two pipelines, one pipeline is connected to the middle part of the boiler, and the other pipeline is connected to the water cooling air chamber.
4. The boiler system for reducing the amount of NOx emissions of claim 3, wherein the other end of the pipe connected to the middle of the boiler is connected to the overfire air blower, and the other end of the pipe connected to the water cooled plenum is connected to the once air blower.
5. The boiler system for reducing NOx emissions of claim 1, wherein said boiler further comprises a cold slag air inlet, said cold slag air inlet being positioned opposite the air preheater conduit connecting the middle of the boiler, such that convection of the air in the boiler occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020412788.8U CN212108479U (en) | 2020-03-27 | 2020-03-27 | Boiler system capable of reducing NOX emission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020412788.8U CN212108479U (en) | 2020-03-27 | 2020-03-27 | Boiler system capable of reducing NOX emission |
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| Publication Number | Publication Date |
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| CN212108479U true CN212108479U (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020412788.8U Active CN212108479U (en) | 2020-03-27 | 2020-03-27 | Boiler system capable of reducing NOX emission |
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| CN (1) | CN212108479U (en) |
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2020
- 2020-03-27 CN CN202020412788.8U patent/CN212108479U/en active Active
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