CN112923386A - Air supply system and method for air gasification of electric dust removal ash bucket - Google Patents
Air supply system and method for air gasification of electric dust removal ash bucket Download PDFInfo
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- CN112923386A CN112923386A CN202110323794.5A CN202110323794A CN112923386A CN 112923386 A CN112923386 A CN 112923386A CN 202110323794 A CN202110323794 A CN 202110323794A CN 112923386 A CN112923386 A CN 112923386A
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- filter screen
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- dust removal
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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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- 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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Abstract
An air supply system and method for an electric dust removal ash bucket by using gasification air comprises a gasification fan, wherein the inlet of the gasification fan is connected with the flue gas outlet of a coal-fired boiler through a flue gas pipeline with a filter screen, and the outlet of the gasification fan is connected to the bottom of an electric dust removal ash bucket. Coal fired boiler's exhanst gas outlet connects into the mouth pipeline, the inlet pipeline is connected respectively with filter screen two, filter screen one and filter screen two are the duplex filter screen of block form, the flue gas pipeline of the export of filter screen one and filter screen two joins the back and connects the gasification fan, the gasification fan will step up the flue gas after joining through export pipeline, gasification fan export pneumatic door, ash bucket gasification wind pipeline and electric precipitation ash bucket link to each other. The invention can match the temperature of the gasification air supply with the temperature of the ash in the ash hopper, reduce the disturbance of the abnormal equipment to the operation of electric dust removal, avoid the unstable problems of abnormal tripping and the like caused by the long-term operation of electric heating, and has better economical efficiency.
Description
Technical Field
The invention relates to the technical field of dust removal, relates to an electric dust removal system, and particularly relates to an air supply system and method for an electric dust removal ash bucket gasification air.
Background
The electric dust remover of the coal-fired power plant is used for removing a large amount of ash content after combustion in the boiler flue gas, and is an important component of a boiler thermodynamic system. The gasified air of the electric dust removal ash bucket enables the ash content deposited in the ash bucket to reach a gas-solid two-phase flow state, thereby preventing the dust from hardening and facilitating the pneumatic transmission.
At present, the conventional-designed gasification air supply system for the electric dust removal ash bucket adopts a Roots blower to supply air, heats the air by electric heating and then sends the air into the ash bucket, and the design purpose is achieved. This design has both economic and safety issues:
1. the electric heating belongs to high-energy-consumption equipment, and the service power of the unit can be increased after long-time operation, so that the economic benefit of the unit is influenced;
2. the reliability of the gas supply mode of the combination of the Roots blower and the electric heating is poor, if the Roots blower or the electric heating is abnormally tripped, the gas supply temperature and the flow cannot be guaranteed, the temperature in the ash bucket is reduced due to frequent occurrence, dust is hardened, the ash bucket cannot be pneumatically conveyed to the ash warehouse, the ash bucket is filled with ash seriously, the electric dust removal efficiency is influenced or the electric dust removal is forced to exit, and the serious consequence that the environmental protection index does not reach the standard is caused. In view of the above, how to improve the economy and reliability of air supply of the electric dust and ash removing hopper becomes an important research topic.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a gasification air supply system and method for an electric dust removal ash hopper, which can match the air supply temperature of the gasification air with the ash temperature in the ash hopper, reduce the disturbance of the abnormal equipment to the operation of electric dust removal, avoid the unstable problems of abnormal tripping and the like caused by the long-term operation of electric heating and have better economical efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an electric precipitator dust hopper gasification wind air feed system, includes the gasification fan, and the exhanst gas outlet of coal fired boiler 1 is connected through the flue gas pipeline who takes the filter screen to the entry of gasification fan, and exit linkage is in the bottom of electric precipitator dust hopper 16.
The filter screen is the block duplex filter screen, including filter screen one 5 and filter screen two 6, coal fired boiler 1's exhanst gas outlet divide into two the tunnel, and one way is connected with the flue gas pipeline of taking the filter screen through inlet pipeline 2, and another way is connected electrostatic precipitator 17.
The inlet of the first filter screen 5 is provided with a first manual door 3, the outlet of the first filter screen is provided with a third manual door 7, the inlet of the second filter screen 6 is provided with a second manual door 4, and the outlet of the second filter screen is provided with a fourth manual door 8.
The gasification fan comprises a first gasification fan 11 and a second gasification fan 12 which are arranged in parallel, wherein one of the first gasification fans and the second gasification fan operates normally, and the other one is standby.
Filter screen 5 is configured with filter screen differential pressure switch 9, filter screen two 6 are configured with filter screen differential pressure switch two 10, and filter screen differential pressure switch is used for the control filter screen differential pressure.
The gasification fan converges the flue gas after will stepping up and then links to each other with electric precipitation ash bucket 16 through outlet pipe 13, gasification fan export pneumatic door 14, ash bucket gasification wind pipeline 15, gasification fan export pneumatic door 14 is used for the system to stop the back and separates ash bucket gasification wind.
The electric dust removal ash bucket gasification air supply system is used for an electric dust removal system.
The electric dust removal system is used for a coal-fired boiler.
An air supply method of an air supply system of an electric dust removal ash bucket gasification air comprises the following steps;
when the unit is started and the electric dust removal ash bucket gasification air system is put into operation, the temperature of the flue gas at the outlet of the coal-fired boiler 1 is checked to be matched with the temperature of ash in the electric dust removal ash bucket 16;
opening a first manual door 3 and a second manual door 4 at the inlet of a first filter screen 5 and a second filter screen 6, opening a third manual door 7 and a fourth manual door 8 at the outlet of the filter screens, and introducing high-temperature flue gas into inlets of a first gasification fan 11 and a second gasification fan 12; starting a first gasification fan 11 and a second gasification fan 12, opening a pneumatic door 14 at the outlet of the gasification fans, and conveying high-temperature flue gas to an electric dust removal ash hopper 16 through an ash hopper gasification air pipeline 15 to realize the gasification effect;
when the system is in operation, a first filter screen differential pressure switch 9 and a second filter screen differential pressure switch 10 are put in for monitoring the front-back differential pressure of the filter screens, when the front-back differential pressure of the filter screens exceeds a set value, an alarm signal is sent to a control system, the filter screens with the pressure difference exceeding the limit are isolated through a first inlet manual door 3 or a second manual door 4 and a third outlet manual door 7 or a fourth manual door 8, the filter screens are switched to another standby filter screen, the continuous operation of the system is ensured, after the manual doors at the inlet and the outlet of the filter screens are closed, the isolation of the filter screens to be overhauled and the system can be completed, when one fan breaks down, the operation can be quitted.
The temperature of the high-temperature flue gas extracted from the flue gas outlet of the coal-fired boiler 1 is between 120 and 130 ℃.
The invention has the beneficial effects that:
when the air supply system of the electric dust and ash hopper is in specific operation, high-temperature flue gas is extracted from a flue gas pipeline at an electric dust inlet to serve as a gasification air source, so that the temperature of the gasification air is matched with the temperature of ash in the ash hopper, and the possibility of ash hardening is reduced; electric heating is not adopted, so that the electricity consumption of the electric heating is reduced, the service power is reduced, and the economy is higher; meanwhile, the risk of instability in operation caused by electric heating tripping is avoided, the supply reliability of the gasified air is greatly improved, and stable operation of the unit is facilitated.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a coal-fired boiler, 2 is an inlet pipeline, 3 is an inlet manual door I, 4 is an inlet manual door II, 5 is a filter screen I, 6 is a filter screen II, 7 is an outlet manual door III, 8 is an outlet manual door IV, 9 is a filter screen differential pressure switch I, 10 is a filter screen differential pressure switch II, 11 is a gasification fan I, 12 is a gasification fan II, 13 is a gasification fan outlet pipeline, 14 is a gasification fan outlet pneumatic door, 15 is an ash bucket gasification air pipeline, 16 is an electric dust removal ash bucket, 17 is an electric dust removal, 18 is an induced draft fan, 19 is a desulfurizing tower, and 20 is a chimney.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the invention comprises a coal-fired boiler 1, an inlet manual door, an outlet manual door, a filter screen differential pressure switch, a gasification fan outlet pipeline, a gasification fan outlet pneumatic door 14, an ash bucket gasification air pipeline 15, an electric dust and ash bucket 16, an electric dust remover 17, an induced draft fan 18, a desulfurizing tower 19 and a chimney 20. The outlet of the flue gas of the coal-fired boiler 1 is divided into two paths, wherein one path is communicated with the filter screen through the inlet pipeline 2, and the other path is communicated with the flue gas inlet of the electric dust remover 17. The filter screen is the parallel pair filter screen, and the entry sets up manual door, and the export sets up manual door. The flue gas pipeline at the outlet of the filter screen is connected with the gasification fan, and the flue gas is boosted by the gasification fan and then is connected with the electric dust and ash removing bucket 16 through the outlet pipeline 13, the pneumatic door 14 at the outlet of the gasification fan and the gasification air pipeline 15 of the ash bucket. The clean flue gas at the outlet of the electric dust collector 17 is communicated with a draught fan 18, passes through a desulfurizing tower 19 and is discharged into the atmosphere through a chimney 20.
The specific operation process of the invention is as follows:
when the unit is started, high-temperature flue gas at the outlet of the coal-fired boiler 1 enters the electric dust remover 17, and after burning dust is removed in the electric dust remover 17, the flue gas is sucked by the draught fan 18, passes through the desulfurizing tower 19 and is discharged into the atmosphere through the chimney 20. The ash deposited in the electric dust and ash bucket 16 is blown by the gasification air of the ash bucket and then is pneumatically conveyed to an ash warehouse. When the electric dust removal ash bucket gasification air system is put into operation, the temperature of the outlet flue gas of the coal-fired boiler 1 is checked to be matched with the temperature of ash in the electric dust removal ash bucket 16. And opening a first manual door 3 and a second manual door 4 at the inlet of a first filter screen 5 and a second filter screen 6, opening a third manual door 7 and a fourth manual door 8 at the outlet of the filter screens, and introducing high-temperature flue gas into the inlet of a first gasification fan 11 and the inlet of a second gasification fan 12. And starting the first gasification fan 11 and the second gasification fan 12, opening a pneumatic door 14 at the outlet of the gasification fans, conveying high-temperature flue gas to an electric dust removal ash hopper 16 through an ash hopper gasification air pipeline 15, and checking that the system works normally.
In addition, the temperature of the high-temperature flue gas extracted from the flue gas outlet of the coal-fired boiler 1 is between 120 ℃ and 130 ℃, the high-temperature flue gas is matched with the temperature of the deposited ash in the electric dust removal ash bucket 16, the high-temperature flue gas can ensure a good gasification effect without heating by using electricity, and the high-temperature flue gas is energy-saving and reliable.
In addition, the first filter screen differential pressure switch 9 and the second filter screen differential pressure switch 10 are used for monitoring the front and back differential pressure of the filter screen, judging the passing capacity of the filter screen, determining the blocking condition of the filter screen, and sending an alarm signal to a control system when the front and back differential pressure of the filter screen exceeds a set value.
In addition, the first filter screen 5 and the second filter screen 6 are arranged in parallel in a duplex mode, a one-use one-standby operation mode is adopted, and in the operation process, when one filter screen is blocked, the first inlet manual door 3 or the second manual door 4 is separated from the third outlet manual door 7 or the fourth manual door 8, and the other filter screen is switched to the other standby filter screen, so that the continuous operation of the system is ensured. Meanwhile, the filter screen can be cleaned under the condition of continuous operation of the system, the exit working condition of the system is reduced, and the operation reliability of the system is ensured.
In addition, the gasification fan 1112 for conveying the high-temperature flue gas at the outlet of the first filter screen 5 and the second filter screen 6 is two roots fans arranged in parallel, and a one-use one-standby operation mode is adopted, so that when one fan fails, the one fan can quit operation, the other standby fan is started to continue gas supply, and the operation reliability of the system is ensured.
The invention relates to an air supply method for an electric dust removal ash bucket by using gasified air, which comprises the following steps:
when the unit starts, when the electric dust removal ash bucket gasification air system is put into operation, the temperature of the outlet flue gas of the coal-fired boiler 1 is checked to be matched with the temperature of ash in the electric dust removal ash bucket 16. Opening a first manual door 3 and a second manual door 4 at the inlets of a first filter screen 5 and a second filter screen 6, opening a third manual door 7 and a fourth manual door 8 at the outlets of the filter screens, and introducing high-temperature flue gas into inlets of a first gasification fan 11 and a second gasification fan 12. And starting the first gasification fan 11 and the second gasification fan 12, opening a pneumatic door 14 at the outlet of the gasification fans, and conveying the high-temperature flue gas to an electric dust removal ash hopper 16 through an ash hopper gasification air pipeline 15 to realize the gasification effect. In the system operation, a first filter screen differential pressure switch 9 and a second filter screen differential pressure switch 10 are put into use for monitoring the front-back differential pressure of the filter screen, and when the front-back differential pressure of the filter screen exceeds a set value, an alarm signal is sent to a control system. And the filter screens with the pressure difference exceeding the limit are isolated through the inlet manual door I3 and the outlet manual door II 4 and the outlet manual door III 7 and the outlet manual door IV 8, and the filter screens are switched to the other standby filter screen, so that the continuous operation of the system is ensured. After the manual door of the inlet and the outlet of the filter screen is closed, the isolation of the overhauled filter screen and the system can be completed. When one fan breaks down, the fan can quit operation, and the other standby fan is started to continue air supply.
Claims (10)
1. The utility model provides an electric precipitator dust hopper gasification wind air feed system, its characterized in that, includes the gasification fan, and the exhanst gas outlet of coal fired boiler (1) is connected through the flue gas pipeline who takes the filter screen to the entry of gasification fan, and exit linkage is in the bottom of electric precipitator dust hopper (16).
2. The air supply system for the gasified air of the electric precipitator dust hopper as claimed in claim 1, wherein the filter screen is a parallel duplex filter screen, and comprises a first filter screen (5) and a second filter screen (6), the flue gas outlet of the coal-fired boiler (1) is divided into two paths, one path is connected with the flue gas pipeline with the filter screen through the inlet pipeline (2), and the other path is connected with the electric precipitator (17).
3. The air supply system for the gasified air of the electric dust removal ash hopper according to claim 2, wherein a first manual door (3) is arranged at the inlet of the first filter screen (5), a third manual door (7) is arranged at the outlet of the first filter screen, a second manual door (4) is arranged at the inlet of the second filter screen (6), and a fourth manual door (8) is arranged at the outlet of the second filter screen.
4. The air supply system for the electric dust removal hopper gasification air as claimed in claim 2, wherein the gasification fan comprises a first gasification fan (11) and a second gasification fan (12) which are arranged in parallel, one of the first gasification fan and the second gasification fan is in normal operation, and the other one is in standby.
5. The air supply system for the gasified air of the electric dust removal ash hopper according to claim 2, wherein the first filter screen (5) is provided with a first filter screen differential pressure switch (9), the second filter screen (6) is provided with a second filter screen differential pressure switch (10), and the first filter screen differential pressure switch is used for monitoring filter screen differential pressure.
6. The electric dust removal ash bucket gasification air supply system according to claim 2, wherein the gasification fan converges the boosted flue gas and then is connected with the electric dust removal ash bucket (16) through an outlet pipeline (13), a gasification fan outlet pneumatic door (14) and an ash bucket gasification air pipeline (15), and the gasification fan outlet pneumatic door (14) is used for isolating ash bucket gasification air after the system is stopped.
7. The air supply method of the air supply system of the electric dust removal ash bucket gasification air according to any one of claims 1 to 6, characterized by comprising the following steps;
when the unit is started and the electric dust removal ash bucket gasification air system is put into operation, the temperature of the flue gas at the outlet of the coal-fired boiler (1) is checked to be matched with the temperature of ash in the electric dust removal ash bucket (16);
opening a first manual door (3) and a second manual door (4) at the inlet of a first filter screen (5) and a second filter screen (6), opening a third manual door (7) and a fourth manual door (8) at the outlet of the filter screen, and introducing high-temperature flue gas into inlets of a first gasification fan (11) and a second gasification fan (12); starting a first gasification fan (11) and a second gasification fan (12), opening a pneumatic door (14) at the outlet of the gasification fans, and conveying high-temperature flue gas to an electric dust removal ash bucket (16) through an ash bucket gasification air pipeline (15) to realize the gasification effect;
when the system is in operation, a first filter screen differential pressure switch (9) and a second filter screen differential pressure switch (10) are put in for monitoring the front-back differential pressure of the filter screen, when the front-back differential pressure of the filter screen exceeds a set value, an alarm signal is sent to a control system, the filter screen with the over-limit differential pressure is isolated through a first inlet manual door (3) or a second manual door (4) and a third outlet manual door (7) or a fourth manual door (8), and is switched to another spare filter screen, so that the system is ensured to operate continuously, after the manual door at the inlet and the outlet of the filter screen is closed, the isolation of the filter screen and the system can be completed, when one fan fails, the operation can be quitted, and the other spare fan is.
8. The air supply method for the air supply system of the electric precipitator dust hopper, according to claim 7, characterized in that the temperature of the high-temperature flue gas extracted from the flue gas outlet of the coal-fired boiler (1) is 120-130 ℃.
9. An electric dust removal system, characterized by comprising the air supply system of the electric dust removal hopper gasification air of any one of claims 1 to 6.
10. A coal-fired boiler comprising the electric dust removal system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110323794.5A CN112923386A (en) | 2021-03-26 | 2021-03-26 | Air supply system and method for air gasification of electric dust removal ash bucket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110323794.5A CN112923386A (en) | 2021-03-26 | 2021-03-26 | Air supply system and method for air gasification of electric dust removal ash bucket |
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| Publication Number | Publication Date |
|---|---|
| CN112923386A true CN112923386A (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110323794.5A Pending CN112923386A (en) | 2021-03-26 | 2021-03-26 | Air supply system and method for air gasification of electric dust removal ash bucket |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112923386A (en) |
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2021
- 2021-03-26 CN CN202110323794.5A patent/CN112923386A/en active Pending
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