CN110925785A - Tail flue gas temperature adjusting system, thermal power plant boiler and method - Google Patents
Tail flue gas temperature adjusting system, thermal power plant boiler and method Download PDFInfo
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- CN110925785A CN110925785A CN201911128493.6A CN201911128493A CN110925785A CN 110925785 A CN110925785 A CN 110925785A CN 201911128493 A CN201911128493 A CN 201911128493A CN 110925785 A CN110925785 A CN 110925785A
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- flue
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
- F23M9/003—Baffles or deflectors for air or combustion products; Flame shields in flue gas ducts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides a tail flue gas temperature adjusting system, a thermal power plant boiler and a method. The tail flue gas temperature regulating system comprises a first flue, wherein the first flue comprises a first section of sub-flue, a second section of sub-flue and a third section of sub-flue which are communicated in series; the input end of the first section of sub-flue is connected with the outlet of the hearth; the output end of the third section of sub-flue is connected with a denitration device; a second flue is also directly communicated between the first section of sub-flue and the third section of sub-flue; the output end of the third section of sub-flue is also provided with a temperature sensor, and the temperature sensor is connected with the microprocessor; and a flue gas baffle is arranged in the second flue and is connected with a microprocessor through a driving mechanism, and the microprocessor is used for controlling the driving mechanism to adjust the opening of the flue gas baffle. It can adjust afterbody flue gas temperature, effectively solves because the gas temperature is low and makes the problem that deNOx systems can not drop into.
Description
Technical Field
The invention belongs to the field of thermal power generation, and particularly relates to a tail flue gas temperature adjusting system, a thermal power plant boiler and a method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The inventor finds that when the existing boiler of the thermal power plant is in low load, the tail flue gas temperature is low, and the tail flue gas temperature cannot be adjusted, so that the input condition of a denitration system cannot be reached, and nitrogen oxide NO is enabledXThe emission exceeds the standard, and the use efficiency of the unit is greatly limited.
Disclosure of Invention
In order to solve the problems, the invention provides a tail flue gas temperature adjusting system, a thermal power plant boiler and a method, which can adjust the temperature of the tail flue gas, effectively solve the problem that a denitration system cannot be put into use due to low temperature of the flue gas and ensure that the boiler does not need to worry about NO under low loadXThe emission exceeds the standard, and the method has higher social benefit and economic benefit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides a tail flue gas temperature adjustment system, including:
the first flue comprises a first section of sub-flue, a second section of sub-flue and a third section of sub-flue which are communicated in series; the input end of the first section of sub-flue is connected with the outlet of the hearth; the output end of the third section of sub-flue is connected with a denitration device; the first section of sub-flue and the third section of sub-flue are also directly communicated with
A second flue; the output end of the third section of sub-flue is also provided with a temperature sensor, and the temperature sensor is connected with the microprocessor; be provided with the flue gas baffle in the second flue, the flue gas baffle passes through actuating mechanism and links to each other with microprocessor, microprocessor is used for: and receiving the output flue gas temperature of the third section of sub-flue which is uploaded by the temperature sensor in real time, comparing the current flue gas temperature with a preset temperature threshold, and if the current flue gas temperature is smaller than the preset temperature threshold, adjusting the opening degree of the flue gas baffle until the current flue gas temperature is not smaller than the preset temperature threshold so as to ensure that the denitration device is successfully put into operation.
In one embodiment, the first segment of sub-flues are vertical flues.
In one embodiment, the second segment of sub-flues are horizontal flues.
In one embodiment, the third segment of sub-flues is arranged at an acute angle to the horizontal.
In one embodiment, the microprocessor is connected to a DCS control system.
In one embodiment, the microprocessor is connected with the DCS control system through a wireless communication module.
In one embodiment, one end of the second flue is communicated with the input end of the first section of sub-flue, and the other end of the second flue is communicated with the output end of the third section of sub-flue.
The second aspect of the present invention provides a working method of a tail flue gas temperature adjusting system, which includes:
the temperature sensor monitors the output flue gas temperature of the third section of sub-flue in real time and transmits the output flue gas temperature to the microprocessor;
and the microprocessor compares the current flue gas temperature with a preset temperature threshold, and if the current flue gas temperature is smaller than the preset temperature threshold, the opening of the flue gas baffle is adjusted until the current flue gas temperature is not smaller than the preset temperature threshold so as to ensure that the denitration device is successfully put into operation.
As an embodiment, if the current flue gas temperature is not less than the preset temperature threshold, the closing of the flue gas damper is adjusted.
A third aspect of the invention provides a thermal power plant boiler comprising a back pass flue gas temperature conditioning system as described above.
The invention has the beneficial effects that:
the second flue is directly communicated between the first section of sub-flue and the third section of sub-flue, the temperature sensor at the output end of the third section of sub-flue is used for monitoring the temperature of the flue gas output by the third section of sub-flue in real time and transmitting the temperature to the microprocessor, and the microprocessor is used for controlling the driving mechanism to adjust the opening degree of the flue gas baffle plate so as to adjust the temperature of the flue gas entering the denitration device, so that the denitration device can adjust the temperature of the flue gas entering the denitrationThe denitration device can be normally put into use, the problem that the denitration system cannot be put into use due to low flue gas temperature is effectively solved, and the boiler does not need to worry about NO under low loadXThe emission exceeds the standard, and the method has higher social benefit and economic benefit.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a tail flue gas temperature adjusting system according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1, the tail flue gas temperature adjusting system of the present embodiment includes:
the first flue 1 comprises a first section of sub-flue 1-1, a second section of sub-flue 1-2 and a third section of sub-flue 1-3 which are communicated in series; the input end of the first section of the sub-flue 1-1 is connected with the hearth outlet 2; the output end of the third section of sub-flue 1-3 is connected with the denitration device 3; a second flue 4 is also directly communicated between the first section of sub-flue 1-1 and the third section of sub-flue 1-3; the output end of the third section of sub-flue 1-3 is also provided with a temperature sensor, and the temperature sensor is connected with the microprocessor; be provided with the flue gas baffle in the second flue, the flue gas baffle passes through actuating mechanism and links to each other with microprocessor, microprocessor is used for: and receiving the output flue gas temperature of the third section of sub-flue which is uploaded by the temperature sensor in real time, comparing the current flue gas temperature with a preset temperature threshold, and if the current flue gas temperature is smaller than the preset temperature threshold, adjusting the opening degree of the flue gas baffle until the current flue gas temperature is not smaller than the preset temperature threshold so as to ensure that the denitration device is successfully put into operation.
It should be noted that, in this embodiment, the microprocessor is implemented by a 51-series single chip microcomputer, and a person skilled in the art can set the microprocessor according to a specific working condition, which is not described in detail herein.
In a specific implementation, the first segment of sub-flues are vertical flues.
The second section of sub-flue is a horizontal flue.
The third section of sub-flue is arranged at an acute angle with the horizontal direction.
In one embodiment, the microprocessor is connected to a DCS control system.
The DCS Control System (Distributed Control System) has an existing structure.
Wherein, temperature sensor is current structure, and the person of ordinary skill in the art can specifically select the model according to actual conditions. The temperature sensor is used for monitoring the output flue gas temperature of the third section of sub-flue in real time and transmitting the output flue gas temperature to the microprocessor, and the microprocessor controls the driving mechanism to adjust the opening degree of the flue gas baffle plate so as to adjust the flue gas temperature entering the denitration device.
Wherein, the flue gas baffle realizes the regulation of its aperture through actuating mechanism, and actuating mechanism can adopt driving motor or other existing actuating mechanism (such as structures such as lead screw) to realize.
The denitration device is also of a conventional structure, and the description thereof is omitted.
In one embodiment, the microprocessor is connected with the DCS control system through a wireless communication module.
As a specific implementation manner, one end of the second flue is communicated with the input end of the first segment of sub-flue, and the other end of the second flue is communicated with the output end of the third segment of sub-flue.
The outlet of the flue gas hearth sequentially flows through the first section sub-flue, the second section sub-flue and the third section sub-flue along the original flue of the boiler, the temperature of the flue gas is gradually reduced, and the flue gas reaches the denitration device and flows to rear equipment after being subjected to denitration treatment. The invention adopts the second flue to lead the high-temperature flue gas to the inlet of the denitration device to be mixed with the lower-temperature flue gas output by the output end of the first flue, thereby achieving the purpose of improving the temperature of the flue gas at the inlet of the denitration device; arrange the flue gas baffle in the second flue, the flue gas baffle is closed when boiler load is high, opens the flue gas baffle when needing to use, guides high temperature flue gas to the denitrification facility entry, and the high temperature flue gas volume is adjusted to the accessible flue gas baffle, makes the deNOx systems can normally drop into.
In the embodiment, the second flue is directly communicated between the first section of sub-flue and the third section of sub-flue, the temperature of the output flue gas of the third section of sub-flue is monitored in real time through the temperature sensor at the output end of the third section of sub-flue and is transmitted to the microprocessor, and the microprocessor controls the driving mechanism to adjust the flue gasThe aperture of gas baffle, and then reach the flue gas temperature who adjusts entering denitrification facility for denitrification facility can normally drop into, effectively solves because the flue gas temperature is low and makes the problem that deNOx systems can not drop into, makes the boiler needn't worry NO under the low-loadXThe emission exceeds the standard, and the method has higher social benefit and economic benefit.
The working method of the tail flue gas temperature adjusting system comprises the following steps:
the temperature sensor monitors the output flue gas temperature of the third section of sub-flue in real time and transmits the output flue gas temperature to the microprocessor;
and the microprocessor compares the current flue gas temperature with a preset temperature threshold, and if the current flue gas temperature is smaller than the preset temperature threshold, the opening of the flue gas baffle is adjusted until the current flue gas temperature is not smaller than the preset temperature threshold so as to ensure that the denitration device is successfully put into operation.
Specifically, the preset temperature threshold is a temperature critical value successfully input by the denitration device, and is related to performance parameters of the denitration device, and the temperature critical values successfully input by different denitration devices are different, so that the corresponding preset temperature threshold can be inquired according to an instruction manual of the denitration device.
Example 2
The present embodiment provides a thermal power plant boiler including a back pass flue gas temperature conditioning system as shown in fig. 1.
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 (10)
1. The utility model provides a tail flue gas temperature governing system which characterized in that includes:
the first flue comprises a first section of sub-flue, a second section of sub-flue and a third section of sub-flue which are communicated in series; the input end of the first section of sub-flue is connected with the outlet of the hearth; the output end of the third section of sub-flue is connected with a denitration device; a second flue is also directly communicated between the first section of sub-flue and the third section of sub-flue; the output end of the third section of sub-flue is also provided with a temperature sensor, and the temperature sensor is connected with the microprocessor; be provided with the flue gas baffle in the second flue, the flue gas baffle passes through actuating mechanism and links to each other with microprocessor, microprocessor is used for: and receiving the output flue gas temperature of the third section of sub-flue which is uploaded by the temperature sensor in real time, comparing the current flue gas temperature with a preset temperature threshold, and if the current flue gas temperature is smaller than the preset temperature threshold, adjusting the opening degree of the flue gas baffle until the current flue gas temperature is not smaller than the preset temperature threshold so as to ensure that the denitration device is successfully put into operation.
2. The back pass flue gas temperature conditioning system of claim 1, wherein the first segment of sub-flues is a vertical flue.
3. The back pass flue gas temperature conditioning system of claim 1, wherein the second section of sub-flues are horizontal flues.
4. The back pass flue gas temperature conditioning system of claim 3, wherein the third segment of sub-flues is disposed at an acute angle to the horizontal.
5. The back pass flue gas temperature conditioning system of claim 1, wherein the microprocessor is connected to a DCS control system.
6. The back pass flue gas temperature conditioning system of claim 5, wherein the microprocessor is connected to the DCS control system through a wireless communication module.
7. The back pass flue gas temperature regulation system of claim 1 wherein one end of the second flue communicates with an input end of the first segment of sub-flue, and the other end of the second flue communicates with an output end of the third segment of sub-flue.
8. A method of operating a back pass flue gas temperature conditioning system as claimed in claims 1 to 7, comprising:
the temperature sensor monitors the output flue gas temperature of the third section of sub-flue in real time and transmits the output flue gas temperature to the microprocessor;
and the microprocessor compares the current flue gas temperature with a preset temperature threshold, and if the current flue gas temperature is smaller than the preset temperature threshold, the opening of the flue gas baffle is adjusted until the current flue gas temperature is not smaller than the preset temperature threshold so as to ensure that the denitration device is successfully put into operation.
9. The method of operating a back pass flue gas temperature conditioning system of claim 8, wherein the closing of the flue gas damper is adjusted if the current flue gas temperature is not less than a preset temperature threshold.
10. A thermal power plant boiler, characterized by comprising a back pass flue gas temperature regulation system according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128493.6A CN110925785A (en) | 2019-11-18 | 2019-11-18 | Tail flue gas temperature adjusting system, thermal power plant boiler and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128493.6A CN110925785A (en) | 2019-11-18 | 2019-11-18 | Tail flue gas temperature adjusting system, thermal power plant boiler and method |
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| CN110925785A true CN110925785A (en) | 2020-03-27 |
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| CN201911128493.6A Pending CN110925785A (en) | 2019-11-18 | 2019-11-18 | Tail flue gas temperature adjusting system, thermal power plant boiler and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121101A (en) * | 2022-04-25 | 2022-09-30 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power generating unit |
-
2019
- 2019-11-18 CN CN201911128493.6A patent/CN110925785A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121101A (en) * | 2022-04-25 | 2022-09-30 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power generating unit |
| CN115121101B (en) * | 2022-04-25 | 2023-10-10 | 江苏国信靖江发电有限公司 | Method for adjusting temperature of smoke inlet end of SCR (selective catalytic reduction) system in thermal power unit |
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