CN214974770U - Explosion-proof system for pulverizing of thermal power plant - Google Patents
Explosion-proof system for pulverizing of thermal power plant Download PDFInfo
- Publication number
- CN214974770U CN214974770U CN202120850843.6U CN202120850843U CN214974770U CN 214974770 U CN214974770 U CN 214974770U CN 202120850843 U CN202120850843 U CN 202120850843U CN 214974770 U CN214974770 U CN 214974770U
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- coal
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- steam
- power plant
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- 238000010298 pulverizing process Methods 0.000 title claims abstract description 19
- 239000003245 coal Substances 0.000 claims abstract description 132
- 239000000843 powder Substances 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000012432 intermediate storage Methods 0.000 claims abstract 2
- 238000004880 explosion Methods 0.000 abstract description 9
- 230000005619 thermoelectricity Effects 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 10
- 239000000428 dust Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Abstract
The utility model relates to an explosion-proof system of powder process of thermal power plant. At present, the explosion of a coal pulverizing system of a thermal power plant can cause serious damage to equipment and possibly cause the unplanned shutdown of a unit to cause loss to the safety, economy and operation of the power plant. The utility model provides an explosion-proof system of powder process of thermal power plant which constitutes and includes: the device comprises a steam distribution header (1), wherein four explosion-proof inerting steam pipelines (2) with the same structure are connected to the steam distribution header respectively, the four explosion-proof inerting steam pipelines are connected with inlets of corresponding steel ball coal mills (3) respectively, each explosion-proof inerting steam pipeline is connected with a coal mill inlet manual door (4) and a coal mill inlet electric door (5) respectively, and the steel ball coal mills are first-stage intermediate storage type coal pulverizing system coal mills and second-stage direct-blowing type medium-speed coal mills. The utility model discloses be applied to the thermoelectricity field.
Description
Technical Field
The utility model relates to an explosion-proof system of powder process of thermal power plant.
Background
The explosion of a coal pulverizing system of a thermal power plant is caused, so that equipment is seriously damaged, the unplanned shutdown of a unit possibly causes loss to the safety, economy and operation of the power plant, the traditional technical measure for preventing the explosion of the coal pulverizing system of the thermal power plant is to control the inlet and outlet temperature of a coal pulverizer, and the operation economy of the unit is greatly influenced in the explosion-proof mode, and the explosion-proof method mainly comprises the following steps:
(1) the output of the coal mill is limited, and the power consumption of the coal mill is greatly increased. Because the output of the coal mill mainly comprises two main factors of coal milling and drying output, when the total moisture of raw coal is high, the temperature of an inlet and an outlet of the coal mill is controlled to cause insufficient drying output, the output of the coal mill is reduced to cause the unit consumption of the coal mill to rapidly rise, and the power consumption is increased. Especially, in a part of power plants burning Indonesian coal, the outlet temperature is controlled to be even less than 60 ℃, and the output of a coal mill is reduced by more than 30%.
(2) And under a lower coal mill inlet and outlet temperature control mode, the outlet primary powder pipe is easily blocked due to low temperature of the air-powder mixture at the outlet of the coal mill. Due to the fact that the fluidity of the pulverized coal is greatly reduced due to the reduction of the temperature of the air-powder mixture, accumulated powder is easily formed at the position where the break angle or the flow resistance of the powder pipe is large, and the powder pipe is blocked. In particular, when raw coal having a high water content is burned, the water vapor partial pressure ratio in the air-powder mixture may increase to a dew point temperature, and dew condensation may occur. After the primary air pipe is blocked, the output of the coal mill is reduced, and after accumulated powder in the powder pipe is spontaneously combusted, the powder pipe is burnt red, and the potential safety hazard of powder pipe collapse exists.
(3) Under the lower coal mill inlet and outlet temperature control mode, the cold air consumption of the coal mill is greatly increased, and the coal powder firing is delayed due to the low primary air temperature, so that the flame center of the boiler moves upwards, the temperature reduction water amount of a superheater and a reheater is increased, the smoke exhaust temperature of the boiler quickly rises, the heat loss of the smoke exhaust is increased, and the boiler efficiency is reduced.
(4) The inlet temperature control of the coal mill is low, coal hanging and adherence at the inlet of the coal mill are easily caused under the condition of high moisture of coal types, the ventilation area is reduced, and accumulated coal needs to be cleaned by frequent stopping milling. Frequent starting and stopping of the coal mill affects the service life of a motor and increases the workload of personnel.
Disclosure of Invention
The utility model aims at providing a thermal power plant powder process explosion-proof system.
The above purpose is realized by the following technical scheme:
the utility model provides an explosion-proof system of powder process of thermal power plant which constitutes and includes: the steam distribution header, the steam distribution header on be connected with four explosion-proof inerting steam conduit that the structure is the same respectively, four explosion-proof inerting steam conduit respectively with the entry linkage of the steel ball coal mill that corresponds, every explosion-proof inerting steam conduit on be connected with coal pulverizer entry hand door and coal pulverizer entry electrically operated gate respectively, the steel ball coal mill be one-phase middle warehouse style powder process system coal pulverizer and the direct-blowing formula medium speed pulverizer of second phase.
The steam distribution header is respectively connected with the coarse powder separator, the fine powder separator and the pulverized coal bin through steam pipelines.
The utility model has the advantages that:
1. the utility model discloses a warehouse style powder process system coal pulverizer entry in the middle of the first phase, the explosion-proof inerting steam conduit who is got from the auxiliary steam header steam source is all installed to the formula intermediate speed coal pulverizer body that directly blows in the second phase, start at the powder system, the shut down, the coal feeder takes place the coal-break condition and the operation powder process system lets in explosion-proof inerting steam and reaches and drive the powder process system and contain oxygen content and adsorb the dust when the condition that the stone coal mouth appears emitting mars or smoking is not strict department or row to the coal feeder, thereby it reduces to reach the explosion-proof purpose of powder process system under the explosion limit concentration to make the oxygen content in the wind powder mixture.
2. The utility model discloses can suitably improve the temperature of the business turn over of coal pulverizer after explosion-proof inertization steam of powder process system is put into use, the improvement of coal pulverizer exit temperature will effectively increase the drying of coal pulverizer and exert oneself to make the coal pulverizer powder-making exert oneself and rise and reduce the coal pulverizer powder-making power consumption; the temperature of the inlet and the outlet of the coal mill is increased, so that the primary air temperature of the boiler is increased, the ignition time of pulverized coal is advanced, the flame center of the boiler is reduced, the exhaust gas temperature of the boiler is reduced, and the exhaust gas heat loss of the boiler is reduced; the explosion-proof inerting steam of the powder process system is put into use and is combined with the execution of the explosion-proof auxiliary technical measures of the powder process system, so that the explosion possibility of the powder process system is greatly reduced, and the safe and stable operation of the powder process system also effectively ensures the safe and economic operation of a power plant.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the system comprises a steam distribution header, 2, an explosion-proof inerting steam pipeline, 3, a steel ball coal mill, 4, a coal mill inlet manual door, 5, a coal mill inlet electric door, 6, a steam pipeline, 7, a coarse powder separator, 8, a fine powder separator, 9, a pulverized coal bin, 10, an auxiliary steam pipeline, and 11, an auxiliary steam header combing and water converging pipeline.
The specific implementation mode is as follows:
example 1:
the utility model provides an explosion-proof system of powder process of thermal power plant which constitutes and includes: steam distribution header 1, the steam distribution header on be connected with four explosion-proof inerting steam conduit 2 that the structure is the same respectively, four explosion-proof inerting steam conduit respectively with the entry linkage of the steel ball coal mill 3 that corresponds, every explosion-proof inerting steam conduit on be connected with coal pulverizer entry manual door 4 and coal pulverizer entry electrically operated gate 5 respectively, the steel ball coal pulverizer be the coal pulverizer of first-stage middle storage formula powder process system and the direct-blowing formula medium speed coal pulverizer of second-stage.
Example 2:
according to the explosion-proof system for coal pulverizing of the thermal power plant in embodiment 1, the steam distribution header is respectively connected with the coarse powder separator 7, the fine powder separator 8 and the pulverized coal bunker 9 through the steam pipeline 6.
Example 3:
coal mill start-up
(1) And (4) putting the coal mill and the motor oil station thereof into operation, and confirming that the operation is normal.
(2) And starting the powder exhauster, checking that the rotation direction and the current are normal, and slowly opening a spent valve at the inlet of the powder exhauster after confirming that the air door at the outlet of the powder exhauster is normally opened.
(3) The method comprises the steps of opening a main air door at an inlet of a coal mill, slightly opening a hot air door at the inlet of the coal mill, adjusting a cold air door, increasing the outlet temperature of the coal mill to 60-65 ℃, warm grinding for 10 minutes, adjusting the negative pressure of-0.2-0.06 kPa at the inlet of the coal mill, and starting the coal mill when the air pressure of a powder exhauster is 2.5 +/-0.5 kPa.
(4) Confirming that the starting condition of the coal mill is met, starting an explosion-proof inerting steam electric door (keeping for 20-30 seconds every time the coal mill is opened, and throwing for 2-3 times at intervals), spraying explosion-proof inerting steam into the coal mill, preventing dust raising and reducing oxygen amount in the coal mill, starting the coal mill when the oxygen amount at the inlet of the coal mill is below 15%, and checking that the rotating direction and the current are normal. (the step has the effects that inerting steam is required to be introduced to perform intermittent purging before a coal pulverizing system is started, the oxygen content is reduced to be below an explosion limit value of 15% by utilizing the capability of the steam for driving oxygen, meanwhile, the steam can also adsorb coal dust stored in a coal mill to prevent dust raising, and the effect of reducing the coal dust concentration outside a coal dust explosion concentration range of 1.2-2.1 kg/m) is achieved.)
(5) And starting the coal feeder, gradually increasing the coal feeding amount, simultaneously opening a waste air valve at the inlet of the powder discharging machine to be fully opened, adjusting a hot air door, a cold air door and a recirculation air door at the inlet of the coal mill, adjusting the negative pressure of the inlet of the coal mill to be-0.2 to-0.06 kPa, slightly lowering the outlet temperature to be lower than the high value I corresponding to the selected item, and controlling the pressure difference between the inlet and the outlet of the coal mill to be within the range of 2.5 to 3.5 kPa.
(6) And arranging personnel on site to inspect the operating equipment and adjusting the parameters of the pulverizing system to be normal.
Stopping of coal mill
(1) Gradually reducing the coal feeding amount to zero, stopping the coal feeder, simultaneously gradually closing a mill inlet hot air door, opening an air cooling door, keeping the outlet temperature of the coal mill, and pumping the coal powder for more than 10 minutes at a normal value while the load rate of the coal mill is lower than 40%.
(2) Stopping the coal feeder, simultaneously starting an explosion-proof inerting steam electric door (keeping for 20-30 seconds every time of starting and putting for 2-3 times at intervals), and spraying explosion-proof inerting steam into the coal mill to achieve the purposes of driving oxygen content in a milling system and adsorbing dust.
(the action of the step is that after the coal feeder is stopped, the explosion-proof inerting steam electric door is opened, and the explosion-proof inerting steam is sprayed into the coal mill to drive the oxygen content in the coal pulverizing system to be below 15 percent and to adsorb dust.)
(3) And the air locking device of the movable powder return pipe stops the coal mill when the coarse powder separator has no powder return.
(4) And after the coal mill is shut down, the oil injection device is stopped.
(5) And confirming that the two coal mills corresponding to the coal mill motor oil station are stopped, withdrawing the interlocking switch of the coal mill motor lubricating oil pump, and stopping the running coal mill motor lubricating oil pump.
(6) After the coal mill stops, performing down-draft operation:
(7) and opening a near-path air main door at the inlet of the powder exhauster.
(8) Gradually opening a hot air door and a cold air door at the inlet of the powder discharging machine, closing a spent air door at the inlet of the powder discharging machine, and gradually closing the hot air door, the cold air door and the recycling air door at the inlet of the coal mill.
(9) And adjusting hot and cold air doors at the inlet of the coal mill and hot and cold air doors at the inlet of the powder exhauster to ensure that the inlet temperature of the powder exhauster is less than 200 ℃.
(10) And closing a main inlet valve of the coal mill and exhausting a valve at an inlet of the powder exhauster. In the whole downwind process, the primary wind pressure is kept to be 2.0 +/-0.2 kPa.
(11) Closing the moisture absorption valves of the pulverizing system.
Thirdly, inerting steam is used in the fault treatment process of the pulverizing system
(1) When the coal feeder is in a coal breaking condition, an inerting steam electric door is automatically interlocked and opened (or an operator manually opens and puts in the inerting steam electric door) to spray steam into the coal feeder, so that the oxygen content explosion limit value (the oxygen content is 15%) is avoided, and dust is adsorbed until a coal pulverizing system is safely stopped or the coal feeder is normal when coming again.
(2) When the running coal pulverizing system finds that the condition of sparks or smoke appears at an untight place or a stone discharging coal port, the operator should keep the continuous running of the coal pulverizing system and forbid to stop the running of the coal pulverizer immediately. The explosion of a coal pulverizing system caused by the contact of the coal powder concentration with open fire in the process of reducing the coal powder concentration after the coal feeder is shut down is prevented. The inlet air temperature of the running coal mill is reduced to be within 260 ℃ by controlling the opening of the cold air door and the hot air door of the inlet of the coal mill, the outlet air temperature of the coal mill is reduced to be below 65 ℃, meanwhile, the explosion-proof inerting steam electric door is opened discontinuously, then the operation of the coal pulverizing system is stopped according to a normal mode, and the system can be checked and processed after being isolated from the related air door.
Claims (2)
1. The utility model provides an explosion-proof system of powder process of thermal power plant which constitutes and includes: steam distribution header, characterized by: the steel ball coal mill is characterized in that the steam distribution header is respectively connected with four explosion-proof inerting steam pipelines with the same structure, the four explosion-proof inerting steam pipelines are respectively connected with inlets of corresponding steel ball coal mills, each explosion-proof inerting steam pipeline is respectively connected with a coal mill inlet manual door and a coal mill inlet electric door, and the steel ball coal mills are a first-stage intermediate storage type coal pulverizing system coal mill and a second-stage direct-blowing type medium-speed coal mill.
2. The thermal power plant pulverizing explosion-proof system as claimed in claim 1, wherein: the steam distribution header is respectively connected with the coarse powder separator, the fine powder separator and the coal powder bin through steam pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120850843.6U CN214974770U (en) | 2021-04-24 | 2021-04-24 | Explosion-proof system for pulverizing of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120850843.6U CN214974770U (en) | 2021-04-24 | 2021-04-24 | Explosion-proof system for pulverizing of thermal power plant |
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| Publication Number | Publication Date |
|---|---|
| CN214974770U true CN214974770U (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120850843.6U Withdrawn - After Issue CN214974770U (en) | 2021-04-24 | 2021-04-24 | Explosion-proof system for pulverizing of thermal power plant |
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| CN (1) | CN214974770U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114405640A (en) * | 2021-12-14 | 2022-04-29 | 贵州电网有限责任公司 | Boiler pulverizing system and control method thereof |
-
2021
- 2021-04-24 CN CN202120850843.6U patent/CN214974770U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114405640A (en) * | 2021-12-14 | 2022-04-29 | 贵州电网有限责任公司 | Boiler pulverizing system and control method thereof |
| CN114405640B (en) * | 2021-12-14 | 2023-11-24 | 贵州电网有限责任公司 | Boiler pulverizing system |
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Granted publication date: 20211203 Effective date of abandoning: 20240311 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20211203 Effective date of abandoning: 20240311 |
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