CN111271718A - Device and method for blowing soot by using flue gas for low-temperature and low-temperature coal economizer - Google Patents
Device and method for blowing soot by using flue gas for low-temperature and low-temperature coal economizer Download PDFInfo
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- CN111271718A CN111271718A CN202010184485.XA CN202010184485A CN111271718A CN 111271718 A CN111271718 A CN 111271718A CN 202010184485 A CN202010184485 A CN 202010184485A CN 111271718 A CN111271718 A CN 111271718A
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- low
- temperature economizer
- flue
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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
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
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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
- F23J15/006—Layout of treatment plant
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Abstract
The invention relates to a device and a method for blowing soot by using flue gas of a low-temperature economizer, which mainly comprise the low-temperature economizer (or the low-temperature economizer), a low-temperature economizer inlet flue, a low-temperature economizer outlet flue, an electrostatic precipitator outlet flue, a soot blowing fan inlet baffle door, a soot blowing fan outlet baffle door, an air distribution pipe and a fluidization plate. The invention relates to the field of low-temperature electric dust removal and flue gas waste heat recovery of boilers in thermal power plants, and is suitable for the application field of arranging low-temperature economizers and low-temperature economizers in a horizontal flue in a high-ash environment. The invention has low operation cost and convenient maintenance and repair.
Description
Technical Field
The invention relates to the field of low-temperature electric dust removal and flue gas waste heat recovery of boilers in thermal power plants, and is suitable for the application field of arranging low-temperature economizers and low-temperature economizers in a horizontal flue in a high-ash environment.
Background
The low-low temperature electric dust removal technology is a novel dust removal technology which is applied more at present in China, and can reduce specific resistance and improve the dust removal efficiency of the electrostatic dust remover under certain conditions. The low-temperature economizer usually adopts water medium type heat exchange, arranges a metal heat exchange tube in a flue in front of the electrostatic dust collector, utilizes water and flue gas to carry out indirect heat exchange, reduces the temperature of the flue gas, and reduces the specific resistance of dust, thereby improving the dust removal efficiency of the electrostatic dust collector, and the heated water can return to boiler feed water or heat supply network water for waste heat recovery.
Because the low-temperature economizer is usually arranged in a horizontal flue of the electrostatic dust collector, an ash deposition site inevitably occurs, the conventional low-temperature economizer usually adopts a sound wave soot blower or a fixed rotary steam soot blower, but the two modes have certain effects on removing the ash deposition on a tube bundle of the low-temperature economizer, but the ash deposition at the bottom of the low-temperature economizer cannot be effectively removed.
The invention aims to develop a method for cleaning ash on the bottom of a low-temperature economizer.
Disclosure of Invention
In order to effectively remove the dust accumulated at the bottom of the low-temperature economizer. The technical scheme of the invention is realized in the following mode:
a device and a method for blowing dust by using flue gas for a low-temperature economizer are characterized by comprising the low-temperature economizer (or the low-temperature economizer), a low-temperature economizer inlet flue, a low-temperature economizer outlet flue, an electrostatic dust collector outlet flue, a dust blowing fan inlet baffle door, a dust blowing fan outlet baffle door, an air distribution pipe and a fluidization plate.
When the low-temperature economizer is put into operation, the cleaned flue gas after dust removal is extracted from the flue at the outlet of the electrostatic dust collector, the cleaned flue gas is pressurized by the fan and then is connected with the air distribution pipe of the shell at the bottom of the low-temperature economizer, air is introduced into the fluidization plate, and the ash at the bottom is fluidized and then taken away by the flue gas.
The flue at the outlet of the low-temperature economizer is connected with the electrostatic dust collector; the outlet flue of the electrostatic dust collector is arranged at the outlet of the electrostatic dust collector; the soot blowing flue is connected with the bottom shell of the low-temperature economizer and the outlet flue of the electrostatic dust collector; the soot blowing fan inlet baffle door, the soot blowing fan, the fan outlet baffle door, the air distribution pipe and the fluidization plate are sequentially arranged on the soot blowing flue; the fluidization plate is of a hemispherical structure and is uniformly arranged at the bottom of the low-temperature economizer shell; the air distribution pipe is horizontally connected to the fluidization plate.
The heat exchange tube of the low-temperature economizer (low-temperature economizer) adopts a light tube, a spiral fin, an H-shaped fin or a double-H-shaped fin type, and the heat exchange tube is made of 20 steel, ND steel, stainless steel tubes and the like.
The invention is further described with reference to the following figures and detailed description.
Drawings
The invention is further described with reference to the following figures and detailed description.
FIG. 1 is a schematic process flow diagram of the present invention.
In the figure: 1. the device comprises a low-temperature economizer, 2, 3, 4, an electrostatic dust collector, 5, an outlet flue of the electrostatic dust collector, 6, a soot blowing flue, 7, a soot blowing fan, 8, an inlet baffle door of the soot blowing fan, 9, an outlet baffle door of the soot blowing fan, 10, an air distribution pipe and 11, and a fluidization plate.
Detailed Description
Referring to fig. 1, a device and a method for blowing soot by using flue gas of a low-temperature economizer are characterized by comprising the low-temperature economizer (or the low-temperature economizer) (1), a low-temperature economizer inlet flue (2), a low-temperature economizer outlet flue (3), an electrostatic dust collector (4), an electrostatic dust collector outlet flue (5), a soot blowing flue (6), a soot blowing fan (7), a soot blowing fan inlet baffle door (8), a soot blowing fan outlet baffle door (9), an air distribution pipe (10) and a fluidization plate (11).
The outlet flue (3) of the low-low temperature economizer is connected with an electrostatic dust collector (4); the outlet flue (5) of the electrostatic dust collector is arranged at the outlet of the electrostatic dust collector (4); the soot blowing flue (6) is connected with a shell at the bottom of the low-temperature economizer (1) and an outlet flue (5) of the electrostatic dust collector; the inlet baffle door (8) of the soot blower, the soot blower (7), the outlet baffle door (9) of the blower, the air distribution pipe (10) and the fluidization plate (11) are sequentially arranged on the soot blowing flue (6); the fluidization plate (11) is of an arc-shaped structure and is uniformly arranged at the bottom of the shell of the low-temperature economizer (1); the air distribution pipe (10) is horizontally connected to the fluidization plate (11).
In the system shown in fig. 1, when the electrostatic dust collector (4) normally operates, no matter whether the low-temperature coal economizer (1) is in a commissioning state or not, the dedusted flue gas in the outlet flue (5) of the electrostatic dust collector enters the soot blowing flue (6), the flue gas is pressurized by the soot blowing fan (7), the flue gas is uniformly blown into the fluidization plate (11) through the air distribution pipe (10), the fluidization plate (11) avoids the bottom support of the low-temperature coal economizer (1), the fluidization plate is uniformly arranged on the bottom shell of the low-temperature coal economizer (1), and the bottom accumulated ash is fluidized by the air blown into the fluidization plate (11), so that the fluidization plate has better flowability, the main flue gas is convenient to carry, and the purpose of reducing the bottom accumulated ash of the low-temperature coal economizer (1) is achieved.
The invention has low operation cost and convenient maintenance and repair.
The above description is only an embodiment of the present invention, and the technical features of the present invention are not limited thereto, and any changes or modifications within the field of the present invention by those skilled in the art should be included in the scope of the present invention.
Claims (3)
1. A device and a method for blowing dust by using flue gas for a low-temperature economizer mainly comprise the low-temperature economizer (or the low-temperature economizer), a low-temperature economizer inlet flue, a low-temperature economizer outlet flue, an electrostatic dust collector outlet flue, a dust blowing fan inlet baffle door, a dust blowing fan outlet baffle door, a wind distribution pipe and a fluidization plate, and are characterized in that: the low-temperature economizer adopts a light pipe, a spiral fin, an H-shaped fin or a double-H-shaped fin type heat exchange pipe, the heat exchange pipe is made of 20 steel, ND steel, stainless steel pipes and the like, the low-temperature economizer adopts water as a medium, a shell-side medium is flue gas, and the low-temperature economizer comprises a low-temperature economizer, a low-pressure economizer and the like according to different purposes.
2. The low-temperature economizer outlet flue according to claim 1 is connected with an electrostatic precipitator; the outlet flue of the electrostatic dust collector is arranged at the outlet of the electrostatic dust collector; the soot blowing flue is connected with the bottom shell of the low-temperature economizer and the outlet flue of the electrostatic dust collector; the soot blowing fan inlet baffle door, the soot blowing fan, the fan outlet baffle door, the air distribution pipe and the fluidization plate are sequentially arranged on the soot blowing flue.
3. The fluidization plate of claim 1, which is of an arc-shaped structure and is uniformly arranged at the bottom of the low-temperature economizer shell; the air distribution pipe is horizontally connected to the fluidization plate, so that dust in the air distribution pipe can be prevented from being accumulated and blocking a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010184485.XA CN111271718A (en) | 2020-03-17 | 2020-03-17 | Device and method for blowing soot by using flue gas for low-temperature and low-temperature coal economizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010184485.XA CN111271718A (en) | 2020-03-17 | 2020-03-17 | Device and method for blowing soot by using flue gas for low-temperature and low-temperature coal economizer |
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| Publication Number | Publication Date |
|---|---|
| CN111271718A true CN111271718A (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010184485.XA Pending CN111271718A (en) | 2020-03-17 | 2020-03-17 | Device and method for blowing soot by using flue gas for low-temperature and low-temperature coal economizer |
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| CN (1) | CN111271718A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834083A (en) * | 2021-11-03 | 2021-12-24 | 西安热工研究院有限公司 | System for preventing induced draft fan from stalling and working method thereof |
-
2020
- 2020-03-17 CN CN202010184485.XA patent/CN111271718A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834083A (en) * | 2021-11-03 | 2021-12-24 | 西安热工研究院有限公司 | System for preventing induced draft fan from stalling and working method thereof |
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