CN209840077U - Denitration efficiency improving device - Google Patents
Denitration efficiency improving device Download PDFInfo
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- CN209840077U CN209840077U CN201920392189.1U CN201920392189U CN209840077U CN 209840077 U CN209840077 U CN 209840077U CN 201920392189 U CN201920392189 U CN 201920392189U CN 209840077 U CN209840077 U CN 209840077U
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- cyclone separator
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Abstract
The utility model discloses a denitration efficiency-improving device, which comprises a furnace body, a left-handed wind separator, a right-handed wind separator, a secondary air system, an air distribution plate and a material returning device; a first outlet and a second outlet are arranged on the hearth of the furnace body, the first outlet is connected with an inlet of the left cyclone separator, the second outlet is connected with an inlet of the right cyclone separator, the air distribution plate and the secondary air system are both arranged on the hearth of the furnace body, the air distribution plate is positioned below the secondary air system, the distance between the air distribution plate and the secondary air system is 1.3-1.8m, a material returning device is arranged at the bottom of the left cyclone separator, the material returning device core tube is 490-shaped 510mm, and the castable at the bottom of the material returning device is 350-shaped 400 mm; and 8 spray guns are arranged at the inlet of the left-handed air separator and the inlet of the right-handed air separator. The utility model discloses arrange the science of spray gun, realization that can be better reduces nitrogen oxide's purpose.
Description
Technical Field
The utility model relates to a sell equipment technical field, concretely relates to effect device is carried in denitration.
Background
The existing denitration system is used for SNCR ammonia water denitration, the spray guns are arranged outside the double flues (5 on each of the left side and the right side) of the hearth outlet, and the boiler is low in denitration efficiency due to the fact that the bed temperature of the boiler is high due to the integral structure problem.
In the current operation situation of the boiler in the prior art, the whole boiler operates well, but the bed temperature is high, and the secondary air system is close to the air distribution plate (about 1m), so that the oxygen content in a dense-phase region is easy to be overlarge, and the original emission of NOx is improved.
SUMMERY OF THE UTILITY MODEL
Based on the not enough in the above-mentioned system technique of coming out of stock, the to-be-solved technical problem of the utility model lies in providing a efficiency of coming out of stock improves, simple structure's coming out of stock carries imitates device.
In order to achieve the above object, on the one hand, the utility model provides a denitration efficiency-improving device, which comprises a furnace body, a left-handed wind separator, a right-handed wind separator, a secondary wind system, a wind distribution plate and a material returning device; a first outlet and a second outlet are arranged on a hearth of the furnace body, the first outlet is connected with an inlet of the left-handed air separator, the second outlet is connected with an inlet of the right-handed air separator, the distance between the air distribution plate and the secondary air system is 1300-1800mm, a material returning device is arranged at the bottom of the left-handed air separator, a core tube of the material returning device is 490-510mm, and the height of the castable at the bottom of the material returning device is 350-400 mm; and 8 spray guns are arranged at the inlet of the left-handed air separator and the inlet of the right-handed air separator.
Preferably, the left cyclone separator inlet and the right cyclone separator inlet are respectively provided with two rows of spray guns, and each row of spray guns is uniformly distributed with 4 spray guns.
Preferably, the distance between two adjacent spray guns in each row of spray guns is 1000-.
Preferably, the two rows of spray guns are respectively positioned at the left side and the right side of the inlet of the left cyclone separator and the inlet of the right cyclone separator, and the left row of spray guns and the right row of spray guns of each cyclone separator are oppositely and alternately arranged at the left side and the right side of the cyclone separator.
Preferably, the staggered distance of the two rows of spray guns is 500-750 mm.
Preferably, be provided with intake pipe, air-supply line, feed liquor pipe, air inlet, air intake, inlet on the spray gun, intake-tube connection is on the air inlet, the air-supply line is connected on the air intake, and feed liquor union coupling is on the inlet, air intake set up in the bottom of spray gun, the inlet sets up in the tip of spray gun.
Preferably, a valve and a flow indicator are arranged on the liquid inlet pipe; and a valve is arranged on the air inlet pipe.
Preferably, the liquid inlet pipe is connected with ammonia water, the air inlet pipe is connected with high-pressure fluidized air, and the air inlet pipe is connected with compressed air.
The utility model has the advantages that:
(1) the denitration efficiency of the SNCR denitration device can reach more than 80%, and the comprehensive denitration efficiency can reach more than 85% by adding a staged combustion process. Relevant factors influencing the NOX emission of the CFB boiler are comprehensively considered from the determination of a reducing agent selection and injection scheme, the design of an injection structure, the verification test of an injection system, the formulation of a flow delivery and metering distribution system and an integral scheme, the selection of key parameters, the adjustment and control of operation parameters and the like, and the high NOX removal rate is realized. The SNCR denitration technology of the conventional circulating fluidized bed unit generally has the problems of poor design pertinence, insufficient consideration on various comprehensive factors and the like, and can only realize about 50 percent of denitration efficiency.
(2) The system control directly enters the whole plant DCS, and the method has the advantages of flexible and reliable operation control, capability of quickly responding to load and coal quality changes and changes of boiler operation parameters, low consumption of reducing agents, low ammonia escape and the like. Meanwhile, the technology enables a staged combustion optimization result to enter a DCS control system, the denitration efficiency is improved by 20% -30% on the basis of not increasing the cost, the cost of the reducing agent is reduced by more than 20% compared with that of the traditional SNCR technology, and the market competitiveness is strong.
Drawings
FIG. 1 is a schematic view of the arrangement of spray guns provided by the present invention;
FIG. 2 is a schematic view of the spray gun according to the present invention;
FIG. 3 is a schematic diagram of a modification of the overfire air system;
wherein: 1-liquid inlet, 2-air inlet, 3-air inlet, 4-flow display, 5-valve, 6-air inlet pipe, 7-air inlet pipe, 8-liquid inlet pipe, 9-secondary air system, 10-original secondary air system; 11-air distribution plate.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1 and 2, the utility model provides a denitration efficiency-improving device, which comprises a furnace body, a left cyclone separator, a right cyclone separator, a secondary air system 9, an air distribution plate 11 and a material returning device; a first outlet and a second outlet are arranged on a hearth of the furnace body, the first outlet is connected with an inlet of the left cyclone separator, the second outlet is connected with an inlet of the right cyclone separator, the distance between the air distribution plate 11 and the secondary air system 9 is 1300-1800mm, the bottom is provided with a return feeder, a core pipe of the return feeder is 490-510mm, and castable at the bottom of the return feeder is 350-400 mm; and 8 spray guns are arranged at the inlet of the left-handed air separator and the inlet of the right-handed air separator. The left cyclone separator inlet and the right cyclone separator inlet are respectively provided with two rows of spray guns, and 4 spray guns are uniformly distributed in each row. The distance between two adjacent spray guns in each row of spray guns is 1000-1500 mm. The two rows of spray guns are respectively positioned at the left side and the right side of the inlet of the left cyclone separator and the inlet of the right cyclone separator, the left row of spray guns and the right row of spray guns of each cyclone separator are oppositely and alternately arranged at the left side and the right side of the cyclone separator, and the alternate distance between the left row of spray guns and the right row of spray guns is 500-750 mm.
The arrangement mode of the left cyclone inlet and the right cyclone inlet spray guns provided in the embodiment is the same.
Be provided with intake pipe 7, air-supply line 6, feed liquor pipe 8, air inlet 2, air intake 3, inlet 1 on the spray gun, intake pipe 7 is connected on air inlet 2, air-supply line 6 is connected on air intake 3, and feed liquor pipe 8 is connected on inlet 1, air inlet 2, air intake 3 set up in the bottom of spray gun, inlet 1 sets up in the tip of spray gun.
The liquid inlet pipe 8 is provided with a valve 5 and a flow indicator 4; and a valve 5 is arranged on the air inlet pipe 7. The liquid inlet pipe 8 is connected with ammonia water, the air inlet pipe 6 is connected with high-pressure fluidized air, and the air inlet pipe 7 is connected with compressed air.
The utility model provides a principle that overgrate air, returning charge ware, spray gun were reformed transform:
the secondary air system and the material returning device system are transformed to reduce the bed temperature and reduce the original generation of NOx, namely, the secondary air improves the height of the existing primary secondary air and the secondary air to realize staged combustion, and the material returning device is optimized and transformed to improve the material returning efficiency and reduce the bed temperature.
The utility model discloses an air classification burning technique goes on the combustion process segmentation of fuel. The technology divides the air for combustion into primary air and secondary air, reduces the air quantity (primary air) of a coal powder combustion area, improves the coal powder concentration of the combustion area, and delays the mixing time of the primary air and the secondary air, so that the coal powder forms a fuel-rich area when entering a hearth, fuel is subjected to anoxic combustion in a dense-phase area, amino intermediate products generated at the initial stage of combustion are fully utilized, the self-reduction capability of NOx in the combustion process is improved, and the generation of fuel type NOx is reduced. The smoke generated by the oxygen-poor combustion is mixed with secondary air, so that the fuel is completely combusted. Meanwhile, the purpose of reducing the original emission of NOx is realized by combining the optimization of a material returning device.
The utility model provides a device for increasing efficiency by removing sales, which can realize low-oxygen staged combustion of fuel; and after the bottom of the material returning device is heightened, the material returning amount is increased, and the material returning amount of the circulating ash is increased, so that a stable circulating ash field is established in the CFB boiler, and the nitrogen oxides generated in the coal combustion process of the CFB boiler are inhibited.
The utility model provides a spray gun atomization effect, atomizing angle are good. The temperature of the flue gas entering the separator is generally 800-920 ℃, the flue gas has longer residence time in the separator, and the spray guns are scientifically arranged, so that the reducing agent is sprayed into the flue at the inlet of the separator, the sprayed reducing agent and the flue gas are well mixed under the action of strong cyclone, and the aim of reducing nitrogen oxides can be well fulfilled.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a denitration efficiency improving device which characterized in that: comprises a furnace body, a left-handed air separator, a right-handed air separator, a secondary air system, an air distribution plate and a material returning device; a first outlet and a second outlet are arranged on the hearth of the furnace body, the first outlet is connected with an inlet of the left cyclone separator, the second outlet is connected with an inlet of the right cyclone separator, the air distribution plate and the secondary air system are both arranged on the hearth of the furnace body, the air distribution plate is positioned below the secondary air system, the distance between the air distribution plate and the secondary air system is 1300-plus 1800mm, a material returning device is arranged at the bottom of the left cyclone separator, the core pipe of the material returning device is 490-plus 510mm, and the height of the castable at the bottom of the material returning device is 350-plus 400 mm; and 8 spray guns are arranged at the inlet of the left-handed air separator and the inlet of the right-handed air separator.
2. The denitration efficiency-improving device according to claim 1, characterized in that: the left cyclone separator inlet and the right-handed air separator inlet are respectively provided with two rows of spray guns, and each row of spray guns is uniformly distributed with 4 spray guns.
3. The denitration efficiency-improving device according to claim 2, characterized in that: the distance between two adjacent spray guns in each row of spray guns is 1000-1500 mm.
4. The denitration efficiency-improving device according to claim 2, characterized in that: the two rows of spray guns are respectively positioned at the left side and the right side of the inlet of the left cyclone separator and the inlet of the right cyclone separator, and the left row of spray guns and the right row of spray guns of each cyclone separator are oppositely and alternately arranged at the left side and the right side of the cyclone separator.
5. The denitration efficiency-improving device according to claim 4, characterized in that: the staggered distance of the two rows of spray guns is 500-750 mm.
6. The denitration efficiency-improving device according to claim 1, characterized in that: be provided with intake pipe, air-supply line, feed liquor pipe, air inlet, air intake, inlet on the spray gun, intake-tube connection is on the air inlet, the air-supply line is connected on the air intake, and the feed liquor union coupling is on the inlet, air intake set up in the bottom of spray gun, the inlet sets up in the tip of spray gun.
7. The denitration efficiency-improving device according to claim 6, characterized in that: the liquid inlet pipe is provided with a valve and a flow indicator; and a valve is arranged on the air inlet pipe.
8. The denitration efficiency-improving device according to claim 6, characterized in that: the liquid inlet pipe is connected with ammonia water, the air inlet pipe is connected with high-pressure fluidized air, and the air inlet pipe is connected with compressed air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920392189.1U CN209840077U (en) | 2019-03-26 | 2019-03-26 | Denitration efficiency improving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920392189.1U CN209840077U (en) | 2019-03-26 | 2019-03-26 | Denitration efficiency improving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209840077U true CN209840077U (en) | 2019-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920392189.1U Active CN209840077U (en) | 2019-03-26 | 2019-03-26 | Denitration efficiency improving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209840077U (en) |
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2019
- 2019-03-26 CN CN201920392189.1U patent/CN209840077U/en active Active
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