CN211399797U - Flue gas recirculation device for separating primary air and secondary air - Google Patents
Flue gas recirculation device for separating primary air and secondary air Download PDFInfo
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- CN211399797U CN211399797U CN201921639015.7U CN201921639015U CN211399797U CN 211399797 U CN211399797 U CN 211399797U CN 201921639015 U CN201921639015 U CN 201921639015U CN 211399797 U CN211399797 U CN 211399797U
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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
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Abstract
The utility model provides a flue gas recirculation device for separating air and overgrate air, include: an incinerator configured to incinerate biomass to produce flue gas; a flue gas purification device configured to purify the flue gas, a portion of the purified flue gas discharged by the flue gas purification device being used as recirculated flue gas; a primary air fan configured to guide air as primary air of the incinerator; an overfire air fan configured to direct air and the recirculated flue gas as overfire air to the incinerator. According to the utility model provides a pair of a flue gas recirculation device for separating air and overgrate air is through air of once-draught fan drainage air in order to regard as air, and through air of overgrate fan drainage with the recirculated flue gas is in order to regard as the overgrate air, has reduced flying dust volume and flying dust carbonaceous content, has reduced the fuel unit consumption, has reduced the high temperature corrosion, has optimized the burning operating mode.
Description
Technical Field
The utility model relates to a biological power generation field particularly relates to a flue gas recirculation device for separating primary air and overgrate air.
Background
In recent years, biomass energy is more and more regarded as a renewable resource, a biomass direct-fired power generation technology is an effective way for utilizing the biomass energy, and a biomass direct-fired power plant can convert the biomass energy into available heat energy and electric energy, so that the atmospheric pollution caused by the direct open-air combustion of the biomass is avoided.
The basic principle of biomass direct-combustion power generation is that biomass is subjected to high-temperature incineration, and the generated heat energy is converted into high-temperature steam to push a steam turbine to rotate so as to enable a generator to generate electric energy. In the biomass direct-combustion power generation process, the water-cooled vibrating grate is a carrier for charging and propelling in the biological combustion process, and can ensure the complete combustion of biomass fuel on the grate and the removal of low-melting-point ash slag. However, in actual operation, because the primary air and the secondary air share one air feeder, the air supply of the primary air and the secondary air interferes with each other, so that the air pressure of a secondary air nozzle is lower, and better secondary combustion is difficult to form, thereby indirectly causing larger fly ash content and extremely high fly ash carbon content, and easily causing pipeline blockage at the tail part of a boiler while wasting fuel.
Therefore, there is a need to provide a new flue gas recirculation device for separating primary air from secondary air to solve the above problems.
SUMMERY OF THE UTILITY MODEL
In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.
The utility model provides a flue gas recirculation device for separating air and overgrate air, include:
an incinerator configured to incinerate biomass to produce flue gas;
a flue gas purification device configured to purify the flue gas, a portion of the purified flue gas discharged by the flue gas purification device being used as recirculated flue gas;
a primary air fan configured to guide air as primary air of the incinerator;
an overfire air fan configured to direct air and the recirculated flue gas as overfire air to the incinerator.
Further, the inlet of the primary air is provided at the bottom of the incinerator.
Further, the inlet of the secondary air is provided on a side wall of the throat of the incinerator.
Further, the primary air enters the incinerator through a primary air pipeline, the primary air pipeline comprises a primary air inlet pipeline arranged at the front end of the primary air fan, and a primary air main pipeline and a plurality of primary air branch pipelines arranged between the primary air fan and the primary air inlet, and the plurality of primary air branch pipelines are configured to respectively provide high-end air, middle-end air and low-end air of the primary air to the incinerator.
Further, the secondary air enters the incinerator through a secondary air pipeline, the secondary air pipeline comprises a secondary air inlet pipeline arranged at the front end of the secondary air fan, and a secondary air main pipeline and a plurality of secondary air branch pipelines which are arranged between the secondary air fan and an inlet of the secondary air, and the plurality of secondary air branch pipelines are configured to respectively provide front wall secondary air, rear wall secondary air, over-fire air and ignition air for the incinerator.
Furthermore, a plurality of regulating valves are arranged on the primary air pipeline and the secondary air pipeline.
Further, the flue gas recirculation apparatus further comprises:
a control unit configured to control opening degrees of the plurality of regulating valves.
Further, the plurality of regulating valves comprise a primary air main regulating valve and a secondary air main regulating valve which are respectively arranged on the primary air pipeline and the secondary air pipeline, so that the proportion of the primary air and the secondary air can be regulated.
Further, the overgrate air inlet line includes air inlet line and recirculated flue gas inlet line, a plurality of governing valves including set up respectively in the air inlet line with air regulating valve and recirculated flue gas governing valve on the recirculated flue gas inlet line are in order to adjust the ratio of air in the overgrate air and recirculated flue gas.
Further, an air preheater is further arranged on the air inlet pipeline.
According to the utility model provides a pair of a flue gas recirculation device for separating air and overgrate air is through air of once-draught fan drainage air in order to regard as air, and through air of overgrate fan drainage with the recirculated flue gas is in order to regard as the overgrate air, has reduced flying dust volume and flying dust carbonaceous content, has reduced the fuel unit consumption, has reduced the high temperature corrosion, has optimized the burning operating mode.
Drawings
The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions of the invention, which are used to explain the principles and devices of the invention. In the drawings, there is shown in the drawings,
fig. 1 shows a schematic view of a flue gas recirculation arrangement for separating primary and secondary air according to an exemplary embodiment of the present invention.
Reference numerals
1. Incinerator 2, exhaust-heat boiler
3. Flue gas purification device 4 and draught fan
5. Chimney 10 and primary air fan
20. Secondary fan 30, shut-off valve
101. Primary air inlet pipeline 102 and primary air main pipeline
103. High-end wind branch pipeline 104 and middle-end wind branch pipeline
105. Low end air branch pipe 201, air inlet pipe
202. Recirculated flue gas inlet pipe 203 and secondary air main pipe
204. Rear wall secondary air branch pipeline 205 and over-fire air branch pipeline
206. Front wall secondary air branch pipeline 207 and ignition air branch pipeline
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals refer to like elements throughout.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present invention, detailed steps and detailed structures will be provided in the following description in order to explain the technical solution provided by the present invention. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to these detailed descriptions.
To primary air and overgrate air share a forced draught blower among the prior art, primary air and overgrate air feed interfere with each other, cause the overgrate air nozzle wind pressure lower, the difficult better postcombustion that forms to the indirect great and fly ash carbon content that has led to the fly ash volume is high, when extravagant fuel, very easily leads to the problem of boiler afterbody pipe blockage, the utility model provides a flue gas recirculation device for separating primary air and overgrate air, as shown in FIG. 1, include:
an incinerator 1 configured to incinerate biomass to produce flue gas;
a flue gas cleaning device 3 configured to clean the flue gas, taking a part of the cleaned flue gas discharged by the flue gas cleaning device as recirculated flue gas;
a primary air fan 10 configured to guide air as primary air of the incinerator 1;
an overfire air fan 20 configured to guide air and the recirculated flue gas as overfire air of the incinerator 1.
Exemplarily, the incinerator 1 is configured to incinerate biomass to produce flue gas. The incinerator 1 at least comprises a feeding hole, a fire grate for incinerating garbage, an ash bucket and a slag discharge hole, wherein the fire grate is positioned in a hearth and used for incinerating garbage, and the ash bucket is positioned at the lower part of the incineration fire grate. In addition, the incinerator 1 further comprises an incinerator throat and a flue which is located above the incinerator throat and communicated with the incinerator throat, and the flue is used for discharging smoke generated by burning biomass.
Further, the grate includes a water-cooled vibrating grate. The biomass fed into the incinerator 1 from the feeding port is combusted on the water-cooled vibrating grate to generate high-temperature flue gas, the water-cooled vibrating grate is arranged obliquely, and the incinerated biomass moves from a high position to a low position on the water-cooled vibrating grate and is discharged through the slag discharging port.
The biomass mainly comprises lignocellulose such as straws and trees except grains and fruits in the agriculture and forestry production process, agricultural product processing industry leftovers, agriculture and forestry wastes, livestock manure and wastes in the animal husbandry production process and the like.
Exemplarily, the flue gas recirculation device of the utility model also comprises a waste heat boiler 2. The waste heat boiler 2 is configured to recover waste heat of the flue gas at the outlet of the incinerator 1. Optionally, the heat of the flue gas generated by the incinerator 1 recovered by the waste heat boiler 2 can be used for heating the feed water to generate superheated steam, and then the turbine drives the generator to generate electricity.
Exemplarily, the flue gas cleaning device 3 is configured to clean the flue gas. And the flue gas discharged from the waste heat boiler 2 passes through a flue gas purification device 3 and is discharged after reaching the corresponding national emission standard. The flue gas purification device 3 at least comprises a reaction tower and a dust remover. Specifically, the flue gas enters a reaction tower, which includes a dry deacidification and denitration device to remove harmful gas in the flue gas as an example; next, the flue gas enters a dust collector, which is a bag-type dust collector as an example, to remove dust and particulate matter from the flue gas.
Exemplarily, an induced draft fan 4 is further disposed at the rear end of the flue gas purification device 3, and after the purified flue gas discharged from the flue gas purification device 3 passes through the induced draft fan 4, a part of the purified flue gas is discharged into the atmosphere through a chimney 5, and the other part of the purified flue gas is used as the recirculated flue gas.
Illustratively, the primary air mover 10 is configured to direct air as primary air. The primary air enters the incinerator 1 through a primary air pipeline.
Exemplarily, the inlet of the primary air is arranged at the bottom of the incinerator 1. As an example, an ash hopper located at the bottom of the incinerator 1 is used as a primary air inlet.
Illustratively, the primary air duct includes a primary air intake duct 100 disposed at a front end of the primary air blower 10, and a primary air main duct 102 and a plurality of primary air branch ducts disposed between the primary air blower 10 and an inlet of the primary air.
Further, the plurality of primary air branch ducts include a high-end air branch duct 103, a middle-end air branch duct 104, and a district wind branch duct 105, which respectively supply high-end air, middle-end air, and low-end air of primary air to the incinerator 1.
The primary air pipeline is provided with a plurality of regulating valves, and the opening, closing and opening of the regulating valves are regulated by a control unit or manually.
Illustratively, the plurality of regulating valves comprise a primary air main regulating valve arranged on the primary air pipeline so as to regulate the total air quantity and/or the total air pressure of the primary air. Further, a primary air total flow meter is further arranged on the primary air pipeline to count the total air volume of the primary air.
As an example, the primary air total adjusting valve is arranged on the primary air inlet pipeline 100 and/or the primary air main pipeline 102, and is used for adjusting the total air quantity and/or the total air pressure of the primary air; the primary air total flow meter is arranged on the primary air inlet pipeline 100 and/or the primary air main pipeline 102 so as to count the total air volume of the primary air.
Furthermore, the plurality of regulating valves also comprise regulating valves arranged on the plurality of primary air branch pipelines, and the plurality of primary air branch pipelines are provided with regulating valves so as to respectively regulate the air volume and/or the air pressure of each primary air branch pipeline; and the primary air branch pipelines are provided with flowmeters so as to respectively count the air volume of each primary air branch pipeline.
As an example, the high-end air branch duct 103, the middle-end air branch duct 104 and the district air branch duct 105 are respectively provided with an adjusting valve for adjusting the air volume and/or the air pressure of the high-end air, the middle-end air and the low-end air of the primary air; the high-end air branch pipeline 103, the middle-end air branch pipeline 104 and the low-end air branch pipeline 105 are respectively provided with a flow meter so as to respectively count the air volume of the high-end air, the middle-end air and the low-end air of the primary air.
Illustratively, the overfire air fan 20 is configured to direct air and the recirculated flue gas as overfire air. The secondary air enters the incinerator 1 through a secondary air pipeline.
Illustratively, the inlet of the secondary air is provided on a side wall of the throat of the incinerator.
Illustratively, the secondary air duct includes a secondary air inlet duct disposed at a front end of the secondary air blower 20, and a primary secondary air duct 203 and a plurality of secondary air branch ducts disposed between the secondary air blower and an inlet of the secondary air.
Further, the secondary air intake duct includes an air intake duct 201 and a recirculated flue gas intake duct 202.
Further, the secondary air branch pipelines include a rear wall secondary air branch pipeline 204, an over-fire air branch pipeline 205, a front wall secondary air branch pipeline 206 and an ignition air branch pipeline 207, which respectively provide rear wall secondary air, over-fire air, front wall secondary air and ignition air for the incinerator.
Illustratively, a plurality of regulating valves are arranged on the secondary air pipeline, and the opening, closing and opening of the regulating valves are regulated by a control unit or manually.
Illustratively, the plurality of regulating valves comprise a secondary air main regulating valve arranged on the secondary air pipeline so as to regulate the total air quantity and/or the total air pressure of the secondary air. Further, a secondary air total flow meter is further arranged on the secondary air pipeline to count the total air quantity of the secondary air.
As an example, a main secondary air duct 203 is provided with a main secondary air regulating valve for regulating the total air volume and/or the total air pressure of the secondary air; and a secondary air main pipeline 203 is provided with a secondary air total flow meter to count the total air quantity of the secondary air.
Further, the adjusting valves further include adjusting valves arranged on the air inlet pipeline 201 and the recirculation flue gas inlet pipeline 202 to adjust the ratio of air in the secondary air to recirculation flue gas. Flow meters are arranged on the air inlet pipeline 201 and the recirculation flue gas inlet pipeline 202 to respectively count the flow rates of air and recirculation flue gas in secondary air.
The flue gas recirculation technique is one of low-nitrogen combustion techniques, mainly by controlling O in the incinerator 12Content, temperature level to achieve low nitrogen combustion. The utility model provides a flue gas recirculation device is through making the recirculated flue gas partly as the overgrate air, can effectual reduction burn burning furnace 1 interior local oxygen volume, forms local reductive atmosphere to restrain NOx's formation, the increase of overgrate air can effectual reduction flying dust carbonaceous content, slag carbonaceous content, reduces the unit consumption, reduces high temperature corrosion and flame and erodes, extension continuous operation cycle. In one example, through the flue gas recirculation device of the application, the generation amount of nitrogen oxides in the biomass power plant can be reduced by more than 20%, the ammonia water injection amount of SNCR is greatly reduced, the operation cost is saved, the coking phenomenon of slag in the hearth of the grate-fired biomass power plant incinerator is effectively improved, and the high-temperature corrosion condition of the grate-fired biomass power plant incinerator is effectively improved.
Further, an air preheater is further arranged on the air inlet pipeline 201 to raise the temperature of the secondary air, so as to ensure that the temperature in the incinerator 1 is not too low and lower, and meet the requirements that the flue gas temperature is not lower than 850 ℃ and the flue gas residence time is not shorter than 2 s.
Furthermore, the plurality of regulating valves also comprise regulating valves arranged on the plurality of secondary air branch pipelines, and the plurality of secondary air branch pipelines are provided with regulating valves so as to respectively regulate the air volume and/or the air pressure of each secondary air branch pipeline; and the secondary air branch pipelines are provided with flow meters so as to respectively count the air quantity of each secondary air branch pipeline.
As an example, the rear wall secondary air branch duct 204, the over-fire air branch duct 205, the front wall secondary air branch duct 206 and the ignition air branch duct 207 are respectively provided with adjusting valves for adjusting the air volume and/or the air pressure of the rear wall secondary air, the over-fire air, the front wall secondary air and the ignition air of the secondary air; and flowmeters are respectively arranged on the rear wall secondary air branch pipeline 204, the over-fire air branch pipeline 205, the front wall secondary air branch pipeline 206 and the ignition air branch pipeline 207 so as to respectively count the air quantities of the rear wall secondary air, the over-fire air, the front wall secondary air and the ignition air of the secondary air.
The utility model discloses a flue gas recirculation device still includes the control unit, the control unit configuration is control the primary air pipeline with all governing valves on the overgrate air pipeline, for example primary air total regulating valve and overgrate air total regulating valve adjust primary air total regulating valve and overgrate air total regulating valve through the control unit, in order to adjust primary air with the ratio of overgrate air.
Through realizing the utility model discloses a flue gas recirculation device's primary air with the accurate regulation and control of overgrate air ratio can adjust, optimize the burning simply effectively, has improved production efficiency. In one example, the efficiency of the incinerator can be increased by more than 2%.
Optionally, as shown in fig. 1, the utility model discloses still include connecting tube 301, connecting tube 301 can communicate the main pipeline 102 of the primary air with the main pipeline 203 of the secondary air, be provided with stop valve 30 on connecting tube 301.
In order to separate the primary air and the secondary air during production, the shut-off valve 30 shuts off the connecting duct 301.
It is revised as only through a fan provides the prior art of primary air and overgrate air the utility model discloses a flue gas recirculation device only needs to cut the connecting tube between primary air trunk line and the overgrate air trunk line, increases a new fan to increase the intake stack (like air intake stack and recirculated flue gas intake stack) that links to each other with new fan can, reform transform process simple and convenient, low cost.
According to the utility model provides a pair of a flue gas recirculation device for separating air and overgrate air is through air of once-draught fan drainage air in order to regard as air, and through air of overgrate fan drainage with the recirculated flue gas is in order to regard as the overgrate air, has reduced flying dust volume and flying dust carbonaceous content, has reduced the fuel unit consumption, has reduced the high temperature corrosion, has optimized the burning operating mode.
The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A flue gas recirculation apparatus for separating primary air and secondary air, comprising:
an incinerator configured to incinerate biomass to produce flue gas;
a flue gas purification device configured to purify the flue gas, a portion of the purified flue gas discharged by the flue gas purification device being used as recirculated flue gas;
a primary air fan configured to guide air as primary air of the incinerator;
an overfire air fan configured to direct air and the recirculated flue gas as overfire air to the incinerator.
2. The flue gas recirculation apparatus according to claim 1, wherein the inlet of the primary air is provided at the bottom of the incinerator.
3. The flue gas recirculation apparatus of claim 2, wherein the inlet of the secondary air is provided on a side wall of the throat of the incinerator.
4. The flue gas recirculation apparatus of claim 3, wherein the primary air enters the incinerator through a primary air duct, the primary air duct including a primary air intake duct provided at a front end of the primary air fan, and a primary air main duct and a plurality of primary air branch ducts provided between the primary air fan and an inlet of the primary air, the plurality of primary air branch ducts being configured to supply high-end air, middle-end air, and low-end air of the primary air to the incinerator, respectively.
5. The flue gas recirculation apparatus according to claim 4, wherein the secondary air enters the incinerator through a secondary air duct, the secondary air duct including a secondary air inlet duct provided at a front end of the secondary air fan, and a primary secondary air duct and secondary air branch ducts provided between the secondary air fan and an inlet of the secondary air, the secondary air branch ducts being configured to supply front wall secondary air, rear wall secondary air, over-fire air, and ignition air to the incinerator, respectively.
6. The flue gas recirculation device of claim 5, wherein a plurality of regulating valves are disposed on the primary air duct and the secondary air duct.
7. The flue gas recirculation apparatus of claim 6, further comprising:
a control unit configured to control opening degrees of the plurality of regulating valves.
8. The flue gas recirculation device according to claim 6, wherein the plurality of regulating valves comprise a primary air main regulating valve and a secondary air main regulating valve respectively disposed on the primary air duct and the secondary air duct to regulate the ratio of the primary air and the secondary air.
9. The flue gas recirculation apparatus of claim 6, wherein said secondary air intake duct comprises an air intake duct and a recirculated flue gas intake duct, and said plurality of damper valves comprise an air damper valve and a recirculated flue gas damper valve disposed on said air intake duct and said recirculated flue gas intake duct, respectively, to adjust the ratio of air and recirculated flue gas in said secondary air.
10. The flue gas recirculation system of claim 9, wherein said air intake duct further comprises an air preheater.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110657439A (en) * | 2019-09-27 | 2020-01-07 | 光大绿色环保管理（深圳）有限公司 | Flue gas recirculation device for separating primary air and secondary air |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110657439A (en) * | 2019-09-27 | 2020-01-07 | 光大绿色环保管理（深圳）有限公司 | Flue gas recirculation device for separating primary air and secondary air |
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