CN115805218A - Anti-blocking method for outlet powder pipe of powder making system of thermal power plant boiler - Google Patents
Anti-blocking method for outlet powder pipe of powder making system of thermal power plant boiler Download PDFInfo
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- CN115805218A CN115805218A CN202211268085.2A CN202211268085A CN115805218A CN 115805218 A CN115805218 A CN 115805218A CN 202211268085 A CN202211268085 A CN 202211268085A CN 115805218 A CN115805218 A CN 115805218A
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- 239000000843 powder Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003245 coal Substances 0.000 claims abstract description 148
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 238000010926 purge Methods 0.000 claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- 239000002817 coal dust Substances 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000009529 body temperature measurement Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 238000010298 pulverizing process Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a method for preventing blockage of an outlet powder pipe of a powder making system of a boiler in a thermal power plant, which comprises the following steps: the method comprises the following steps: s01: starting a coal mill; s02: adjusting the operation of the coal mill; s03: when the coal fire detection flickers, an auxiliary air electric door corresponding to the outlet of the coal mill is slowly opened for purging; s04: finding the outlet pressure of the coal mill, the flow rate of coal dust at the outlet of the coal mill, the mixed air quantity at the inlet of the coal mill and the air quantity of a coal drop pipe of the coal mill; s05: when the coal mill is operated, if the primary air pressure at the inlet of the coal mill is lower than 3KPa, properly opening a coal-mill coal-dropping pipe mixing air door; s06: when the coal mill is stopped, the opening degree of a mixing air door at the inlet of the coal mill is closed to 0 percent, and the opening degree of bypass air is more than 30 percent; s07: and after the coal mill is normally stopped, purging each powder pipe for 5min in sequence. According to the invention, through the combination of the temperature measuring instrument, the anemoscope and the pipe blockage analysis module, the pipe blockage phenomenon of the coal mill outlet powder pipe can be timely found and judged, and the combustion stability of the unit is greatly improved.
Description
Technical Field
The invention relates to the field of boiler combustion systems, in particular to a method for preventing a powder pipe at an outlet of a powder making system of a boiler in a thermal power plant from being blocked.
Background
The power plant powder process system is the key system of power plant, is the important component of the combustion system who maintains the power plant normal operating indispensable, and the effect of powder process system: storing a part of raw coal in a raw coal hopper, uniformly feeding the raw coal to a coal mill, grinding the raw coal into coal powder under the action of impact, extrusion or rolling of the coal mill, drying and separating the coal powder in the coal mill, and conveying the coal powder to a furnace for combustion to provide fuel for boiler combustion;
the wind speed measuring instrument on the installation powder pipe of present power plant acts on the nozzle and wears out easily for a long time for measure inaccurate, simultaneously because of the size of the amount of wind that grinds, produce hysteresis to the judgement of stifled pipe, survey through the wind speed measuring instrument and manage the wind speed and judge whether there is stifled pipe reliability in the powder pipe and can not obtain the assurance, probably lead to the furnace burning to worsen when serious, shut down even.
Disclosure of Invention
The invention aims to provide a method for preventing a powder pipe at an outlet of a powder making system of a boiler in a thermal power plant from being blocked so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for preventing blockage of an outlet powder pipe of a powder making system of a boiler in a thermal power plant comprises the following steps:
s01: when the coal mill is started, the opening of the inlet mixing air door is not more than 3% at most, the opening of the mixing air door of a coal falling pipe of the coal mill is more than 60%, the flow speed of coal powder at the outlet of the coal mill is ensured to be 18-22m/s, after the coal mill is started, the opening of the inlet mixing air door is slowly increased according to the change condition of superheat degree, water supply is timely adjusted, and the pipe wall is prevented from being over-heated;
s02: when the coal mill runs, when the pressure of an outlet pulverized coal pipe is higher than the pressure of other pulverized coal pipes of the same coal mill and the flow rate of outlet pulverized coal is lower than the pulverized coal flow rate of other pulverized coal pipes of the same coal mill, an auxiliary air electric door corresponding to the outlet of the coal mill is opened for purging, when the auxiliary air electric door corresponding to the outlet of the coal mill is opened, the operation is slow, full opening at one time is forbidden, the temperature of a water cooling wall in a corresponding area is monitored in the opening process, and the over-temperature of the water cooling wall is prevented;
s03: when the coal fire detection flickers, an auxiliary air electric door corresponding to the outlet of the coal mill is slowly opened for purging;
s04: when the outlet pressure of the coal mill, the flow rate of coal dust at the outlet of the coal mill, the mixed air volume at the inlet of the coal mill and the air volume of a coal dropping pipe of the coal mill are found to be abnormal, a maintenance part is immediately informed to process;
s05: when the coal mill is operated, if the primary air pressure at the inlet of the coal mill is lower than 3KPa, properly opening a coal dropping pipe mixing air door of the coal mill to ensure that the flow rate of coal dust at the outlet of the coal mill is between 18 and 22 m/s;
s06: when the coal mill is stopped, the opening degree of a mixing air door at the inlet of the coal mill is closed to 0 percent, and the opening degree of bypass air is more than 30 percent;
s07: after the coal mill is normally stopped, purging each powder pipe for 5min in sequence, when the coal mill is abnormally stopped, purging is not allowed, loading time is in the morning under normal conditions, early shift personnel should prepare in advance every day, purging each powder pipe of a standby coal mill for 5min in sequence, and therefore the problem that powder accumulation in a pipeline is caused by leakage of a mixed air door at the inlet of the coal mill during standby is avoided, and combustion is rapidly strengthened during starting to cause local overtemperature of a water wall is solved.
Preferably, the powder pipe is provided with a temperature measuring instrument and an anemoscope, and the temperature measuring instrument and the anemoscope are respectively connected with the pipe blockage analysis module.
Preferably, the temperature of the working medium in the powder pipe is measured by installing a temperature measuring instrument on the powder pipe.
Preferably, the anemoscope is arranged on the powder pipe, the wind speed of the powder pipe is measured, the anemoscope can be combined with a temperature measuring instrument, relevant data are sent to the pipe blocking analysis module, the pipe blocking analysis module can timely find and judge the pipe blocking phenomenon of the powder pipe at the outlet of the coal mill, and the specific judgment standard is that when the anemoscope measures that the wind speed of the powder pipe is lower than 20m/s and the temperature of working media of the powder pipe is 10 degrees lower than the temperatures of the other three powder pipes, the powder pipe is blocked.
Preferably, the coal mill is used for grinding raw coal into coal powder, and drying and separating are completed.
Compared with the prior art, the invention has the beneficial effects that:
the temperature measuring instrument is arranged on the powder pipe to measure the temperature of the working medium of the powder pipe, and the anemometer is used for measuring the wind speed of the powder pipe, so that the pipe blockage phenomenon of the powder pipe at the outlet of the coal mill can be timely found and judged and timely processed. And (3) judging standard: the anemoscope measures that the wind speed of the powder pipe is lower than 20m/s, and the temperature of the working medium of the powder pipe is 10 degrees lower than that of the other three powder pipes, so that the powder pipe is blocked, the combustion stability of the unit is greatly improved, the power supply quality of the unit is improved, and even the non-stop accident of the unit is avoided.
Drawings
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
fig. 2 is a schematic diagram of the temperature measuring instrument and the anemoscope respectively connected to the pipe blockage analysis module according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a method for preventing blockage of an outlet powder pipe of a powder making system of a boiler in a thermal power plant comprises the following steps:
s01: when the coal mill is started, the opening of the inlet mixing air door is not more than 3% at most, the opening of the mixing air door of a coal falling pipe of the coal mill is more than 60%, the flow speed of coal powder at the outlet of the coal mill is ensured to be 18-22m/s, after the coal mill is started, the opening of the inlet mixing air door is slowly increased according to the change condition of superheat degree, water supply is timely adjusted, and the pipe wall is prevented from being over-heated;
s02: when the coal mill is operated, when the pressure of an outlet pulverized coal pipe is higher than the pressure of other pulverized coal pipes of the same coal mill and the flow rate of the outlet pulverized coal is lower than the pulverized coal flow rate of other pulverized coal pipes of the same coal mill, an auxiliary air electric door corresponding to the outlet of the coal mill is opened for purging, when the auxiliary air electric door corresponding to the outlet of the coal mill is opened, the operation is slow, full opening is forbidden, the temperature of a water cooling wall in a corresponding area is monitored in the opening process, and the overtemperature of the water cooling wall is prevented, wherein a temperature measuring instrument and an anemoscope are arranged on the pulverized coal pipe, the temperature measuring instrument and the anemoscope are respectively connected with a pipe blockage analysis module, the wind speed of the pulverized coal pipe is measured by installing the anemoscope on the pulverized coal pipe, the wind speed of the pulverized coal pipe can be combined with the temperature measuring instrument, relevant data are sent to the pipe blockage analysis module, the pipe blockage phenomenon of the pulverized coal mill outlet pulverized coal pipe can be timely found and judged by using the pipe blockage analysis module, the specific judgment standard is that the anemoscope measures the wind speed of the pulverized coal pipe is lower than 20m/s and the temperature of the pulverized coal pipe is 10 ℃ lower than the temperature of working medium of the other three pulverized coal pipes, and the pulverized pipe is blocked;
s03: when the coal fire detection flickers, an auxiliary air electric door corresponding to the outlet of the coal mill is slowly opened for purging;
s04: when the outlet pressure of the coal mill, the flow rate of coal dust at the outlet of the coal mill, the mixed air quantity at the inlet of the coal mill and the air quantity of a coal dropping pipe of the coal mill are found to be abnormal, a maintenance part is immediately informed to process;
s05: when the coal mill is operated, if the primary air pressure at the inlet of the coal mill is lower than 3KPa, a mixing air door of a coal dropping pipe of the coal mill needs to be properly opened, and the flow rate of pulverized coal at the outlet of the coal mill is ensured to be 18-22 m/s;
s06: when the coal mill stops running, the opening degree of a mixing air door at the inlet of the coal mill is closed to 0%, and the opening degree of bypass air is more than 30%;
s07: after the coal mill is normally stopped, purging each powder pipe for 5min in sequence, when the coal mill is abnormally stopped, purging is not allowed, loading time is in the morning under normal conditions, early shift personnel should prepare in advance every day, purging each powder pipe of a standby coal mill for 5min in sequence, and therefore the problem that powder accumulation in a pipeline is caused by leakage of a mixed air door at the inlet of the coal mill during standby is avoided, and combustion is rapidly strengthened during starting to cause local overtemperature of a water wall is solved.
According to the invention, the temperature measuring instrument is arranged on the powder pipe to measure the temperature of the working medium of the powder pipe, and the anemometer is used for measuring the wind speed of the powder pipe, so that the pipe blockage phenomenon of the powder pipe at the outlet of the coal mill can be found and judged in time and can be processed in time. And (3) judging standard: the anemoscope measures that the wind speed of the powder pipe is lower than 20m/s, and the working medium temperature of the powder pipe is 10 degrees lower than the temperature of the other three powder pipes, so that the powder pipe is blocked, the combustion stability of the unit is greatly improved, the power supply quality of the unit is improved, and even the non-stop accident of the unit is avoided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for preventing blockage of an outlet powder pipe of a powder making system of a boiler in a thermal power plant is characterized by comprising the following steps:
s01: when the coal mill is started, the maximum opening degree of the inlet mixing air door does not exceed 3%, the opening degree of the mixing air door of a coal dropping pipe of the coal mill is more than 60%, the flow speed of coal powder at the outlet of the coal mill is ensured to be 18-22m/s, after the coal mill is started, the opening degree of the inlet mixing air door is slowly increased according to the change condition of superheat degree, water supply is timely adjusted, and the pipe wall is prevented from being over-heated;
s02: when the coal mill runs, when the pressure of the outlet pulverized coal pipe is higher than the pressure of other pulverized coal pipes of the same coal mill and the flow rate of the outlet pulverized coal is lower than the pulverized coal flow rate of other pulverized coal pipes of the same coal mill, an auxiliary air electric door corresponding to the outlet of the coal mill is opened for purging, the operation is slow when the auxiliary air electric door corresponding to the outlet of the coal mill is opened, the one-time full opening is forbidden, the temperature of a water cooling wall in a corresponding area is monitored in the opening process, and the over-temperature of the water cooling wall is prevented;
s03: when the coal fire detection flickers, an auxiliary air electric door corresponding to the outlet of the coal mill is slowly opened for purging;
s04: when the outlet pressure of the coal mill, the flow rate of coal dust at the outlet of the coal mill, the mixed air volume at the inlet of the coal mill and the air volume of a coal dropping pipe of the coal mill are found to be abnormal, a maintenance part is immediately informed to process;
s05: when the coal mill is operated, if the primary air pressure at the inlet of the coal mill is lower than 3KPa, a mixing air door of a coal dropping pipe of the coal mill needs to be properly opened, and the flow rate of pulverized coal at the outlet of the coal mill is ensured to be 18-22 m/s;
s06: when the coal mill stops running, the opening degree of a mixing air door at the inlet of the coal mill is closed to 0%, and the opening degree of bypass air is more than 30%;
s07: after the coal mill is normally shut down, each powder pipe needs to be sequentially purged for 5min, purging is not allowed when the coal mill is abnormally shut down, the loading time is in the morning under normal conditions, early shift personnel should prepare in advance every day, each powder pipe of the standby coal mill is sequentially purged for 5min, the problem that powder is accumulated in a pipeline due to leakage of a mixed air door at the inlet of the coal mill during standby is prevented, and combustion is rapidly strengthened during starting to cause local overtemperature of a water wall.
2. The method for preventing the blockage of the powder outlet pipe of the powder making system of the boiler of the thermal power plant according to claim 1, wherein the method comprises the following steps: the powder pipe is provided with a temperature measuring instrument and an anemoscope, and the temperature measuring instrument and the anemoscope are respectively connected with the pipe blockage analysis module.
3. The method for preventing the blockage of the powder outlet pipe of the powder making system of the boiler of the thermal power plant according to claim 2, characterized in that: and a temperature measuring instrument is arranged on the powder pipe to measure the temperature of the powder pipe working medium.
4. The method for preventing the blockage of the powder outlet pipe of the powder making system of the boiler of the thermal power plant according to claim 3, wherein the method comprises the following steps: through installing the anemoscope on the powder pipe, carry out the measurement of powder pipe wind speed, can combine together with temperature measurement appearance, give stifled pipe analysis module with relevant data transmission, utilize stifled pipe analysis module can in time discover and judge the stifled pipe phenomenon of coal pulverizer export powder pipe, specific judgement standard is, when the anemoscope measured powder pipe wind speed is less than 20m/s and this powder pipe working medium temperature is 10 degrees than other three powder pipe temperatures, then this powder pipe exists stifled pipe.
5. The method of claim 4 for preventing blockage of the powder outlet pipe of the pulverizing system of the boiler of the thermal power plant, wherein the method comprises the following steps: the coal mill is used for grinding raw coal into coal powder and completing drying and separation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211268085.2A CN115805218A (en) | 2022-10-17 | 2022-10-17 | Anti-blocking method for outlet powder pipe of powder making system of thermal power plant boiler |
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| CN202211268085.2A CN115805218A (en) | 2022-10-17 | 2022-10-17 | Anti-blocking method for outlet powder pipe of powder making system of thermal power plant boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006115787A (en) * | 2004-10-22 | 2006-05-11 | Shigematsu Kogyo Kk | Root vegetable-washing device |
| CN101334666A (en) * | 2008-07-15 | 2008-12-31 | 西安艾贝尔科技发展有限公司 | Double-inlet double-outlet steel ball coal mill straight blowing type milling system optimized control method |
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| CN104627684A (en) * | 2015-01-27 | 2015-05-20 | 上海发电设备成套设计研究院 | Online pipe anti-blocking method for utility boiler primary air pipe |
| CN105057078A (en) * | 2015-07-10 | 2015-11-18 | 广东电网有限责任公司电力科学研究院 | Operational method for preventing mill of coal mill from being blocked |
| CN112404019A (en) * | 2020-10-29 | 2021-02-26 | 张珂 | Dendrobii officmalis caulis processing treatment device of main stem stalk does not harm |
| CN215726188U (en) * | 2021-08-19 | 2022-02-01 | 北京京能电力股份有限公司 | Purging system |
-
2022
- 2022-10-17 CN CN202211268085.2A patent/CN115805218A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006115787A (en) * | 2004-10-22 | 2006-05-11 | Shigematsu Kogyo Kk | Root vegetable-washing device |
| CN101334666A (en) * | 2008-07-15 | 2008-12-31 | 西安艾贝尔科技发展有限公司 | Double-inlet double-outlet steel ball coal mill straight blowing type milling system optimized control method |
| KR20120120738A (en) * | 2011-04-25 | 2012-11-02 | (주)명성 | A vegetables washing device |
| CN104627684A (en) * | 2015-01-27 | 2015-05-20 | 上海发电设备成套设计研究院 | Online pipe anti-blocking method for utility boiler primary air pipe |
| CN105057078A (en) * | 2015-07-10 | 2015-11-18 | 广东电网有限责任公司电力科学研究院 | Operational method for preventing mill of coal mill from being blocked |
| CN112404019A (en) * | 2020-10-29 | 2021-02-26 | 张珂 | Dendrobii officmalis caulis processing treatment device of main stem stalk does not harm |
| CN215726188U (en) * | 2021-08-19 | 2022-02-01 | 北京京能电力股份有限公司 | Purging system |
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