CN114405640B - Boiler pulverizing system - Google Patents
Boiler pulverizing system Download PDFInfo
- Publication number
- CN114405640B CN114405640B CN202111523693.9A CN202111523693A CN114405640B CN 114405640 B CN114405640 B CN 114405640B CN 202111523693 A CN202111523693 A CN 202111523693A CN 114405640 B CN114405640 B CN 114405640B
- Authority
- CN
- China
- Prior art keywords
- air door
- separator
- coal
- powder pipe
- mill body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000010298 pulverizing process Methods 0.000 title claims abstract description 32
- 239000003245 coal Substances 0.000 claims abstract description 65
- 239000000843 powder Substances 0.000 claims abstract description 48
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000003546 flue gas Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000000227 grinding Methods 0.000 claims description 22
- 239000000779 smoke Substances 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 238000004200 deflagration Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a boiler pulverizing system and a control method thereof, wherein the boiler pulverizing system comprises a hearth, a powder pipe quick-closing valve, a separator, a coal feeder, a lower flashboard of the coal feeder, a coal mill body, a capacity air door, a flue gas air door, a cold primary air door, a hot primary air door, a draught fan and a powder pipe, wherein the coal feeder is connected with the coal mill body through the lower flashboard door, the coal mill body is connected with the separator, the separator is connected with the hearth through the powder pipe, and the powder pipe quick-closing valve is arranged on the powder pipe; the flue gas air door, the cold primary air door and the hot primary air door are connected in parallel and then connected with the capacity air door and the bypass air door, the capacity air door is connected to the separator, the bypass air door is connected to a feed inlet of the coal feeder, which is connected with the coal mill body, and the flue gas air door is connected with an outlet of the induced draft fan. The invention is connected with the flue gas at the outlet of the induced draft fan, effectively solves the problem that the coal mill and the powder pipe of the coal pulverizing system are easy to burn and deflagrate when the coal mill of the boiler burns the coal with large volatile matters, and ensures the safe operation of the coal pulverizing system.
Description
Technical Field
The invention relates to the technical field of safe operation of a boiler coal mill of a thermal power plant, in particular to a boiler pulverizing system and a control method thereof.
Background
The process of warm grinding and stopping grinding and blowing during grinding is necessary in a coal pulverizing system of a boiler of a thermal power plant, the boiler needs to adopt different pulverizing systems according to different coal types, and if the coal types are not matched with designs, accidents such as combustion and explosion of the pulverizing systems are easily caused, so that huge economic loss is caused, and great potential safety hazards are brought.
After the thermal power plant operates for a period of time, the actual coal used for combustion often has a larger gap from the designed coal due to factors such as the productivity, price, policy and the like of the original designed coal source, and particularly, when the coal is used for combustion, the ignition temperature of the coal is reduced due to the increase of volatile matters, so that the conditions such as combustion, explosion and the like of the coal preparation system are more likely to occur.
At present, the research on the pulverizing system mainly optimizes the control, and the safety brought by burning different coal types is also mainly optimized from the control flow, so that the problem of burning and deflagration of the pulverizing system can not be fundamentally solved. For example, in chinese patent applications (application numbers 201410102580.5 and 201310746551.8), the flow and parameter control are optimized based on the conventional pulverizing system, so as to achieve the purpose of economical operation of the boiler, and the pulverizing system itself is not used for optimizing different kinds of coal for combustion.
Disclosure of Invention
The invention aims to solve the technical problems that: the boiler pulverizing system and the control method thereof are provided to solve the problems of coal mill, powder tube combustion and deflagration which possibly occur when the boiler pulverizing system is not matched with the designed coal in the prior art.
The technical scheme adopted by the invention is as follows: the boiler pulverizing system comprises a hearth, a powder pipe quick-closing valve, a separator, a coal feeder, a lower gate door, a coal pulverizer body, a capacity air door, a flue gas air door, a cold primary air door, a hot primary air door, an induced draft fan and a powder pipe, wherein the coal feeder is connected with the coal pulverizer body through the lower gate door, the coal pulverizer body is connected with the separator, the separator is connected with the hearth through the powder pipe, and the powder pipe quick-closing valve is arranged on the powder pipe; the flue gas air door, the cold primary air door and the hot primary air door are connected in parallel and then connected with the capacity air door and the bypass air door, the capacity air door is connected to the separator, the bypass air door is connected to a feed inlet of the coal feeder, which is connected with the coal mill body, and the flue gas air door is connected with an outlet of the induced draft fan.
Preferably, the coal mill body is connected with two sets of hearths, a separator and a coal feeder.
Preferably, the flue gas air door is of a manual, pneumatic or electric type and has an automatic opening adjusting function.
Preferably, a booster fan is additionally arranged between the outlet of the induced draft fan and the flue gas air door.
A control method of a boiler pulverizing system comprises a control method of a start grinding and warm grinding working condition and a control method of a stop grinding working condition.
The control method for the starting and warm grinding working condition comprises the following steps:
step oneConfirming outlet temperature t of induced draft fan i More than 100 ℃, and the oxygen content is less than 6%;
checking and confirming that the cold primary air door and the hot primary air door are in the closed position;
checking and confirming that the capacity air door is fully opened, and the opening of the bypass air door is 10% -30%;
step four, opening a smoke air door to 10%, opening a powder pipe to quickly close the door when the pressure of the mill is more than 2kPa, and gradually opening the smoke air door at the same time to enable the wind speed of the powder pipe to be more than 5m/s;
maintaining the opening of the flue gas door until the outlet temperature of the mill body and the separator meets t o> t min ；
Step six, starting the mill body, opening the lower gate plate door, gradually closing the smoke air door, opening the cold primary air door and the hot primary air door, and adjusting the capacity air door and the bypass air door to enable the air speed of the powder tube to be larger than the allowable minimum air speed s min And maintaining the separator outlet temperature t o Meets the set condition, and the outlet temperature t of the separator o The set conditions are satisfied:
t max >t o >t min
wherein t is max T is the maximum allowable temperature of the outlet temperature of the separator min The minimum allowable temperature for the outlet temperature of the separator (4).
The control method of the grinding stopping working condition comprises the following steps:
step one, confirming the outlet temperature t of a draught fan i Greater than 100 ℃;
step two, closing the lower flashboard door, gradually closing the primary hot air door, adjusting the capacity air door and the bypass air door to enable the wind speed of the powder pipe to be larger than the allowable minimum wind speed s min And maintaining the separator outlet temperature t o Meets the set condition; separator outlet temperature t o The set conditions are satisfied:
t max >t o >t min
wherein t is max T is the maximum allowable temperature of the outlet temperature of the separator min A minimum allowable temperature for the separator outlet temperature;
step three, when the powder level in the mill body is lower than l 0 When the mill body is stopped, l 0 Allowing the mill body to stop grinding the highest powder level;
step four, gradually closing the cold primary air door, the hot primary air door and gradually opening the smoke air door, and adjusting the capacity air door and the bypass air door to enable the wind speed of the powder pipe to be larger than the allowable minimum wind speed s min And maintained for more than 15 min.
Step five, closing a powder pipe quick closing valve, gradually closing a smoke air door, and enabling the pressure p of the mill body to be the same m >p b ，p b For furnace pressure, p m Is the pressure in the coal mill.
The medium-high temperature flue gas (100-160 ℃) with low oxygen content at the outlet of the induced draft fan 15 is connected with the primary air header of the pulverizing system through the flue gas air door 11 in the system, warm grinding is carried out through the flue gas when the mill is started, and final purging is carried out through the flue gas when the mill is stopped, so that the coal dust in the coal mill and the powder pipe is fundamentally prevented from being in direct contact with a large amount of oxygen, and combustion and explosion in the coal mill and the powder pipe in the starting and stopping process of the coal mill are effectively avoided.
The invention has the beneficial effects that: compared with the traditional coal mill pulverizing system, the system is connected with medium-high temperature and low-oxygen-content smoke at the outlet of the induced draft fan, warm grinding is carried out through the smoke in the starting process of the coal mill, and purging is carried out through the smoke in the shutdown process of the coal mill, so that the problems that the pulverizing system is easy to burn and deflagrate when the coal is burned, and the safe operation of the pulverizing system is ensured. Meanwhile, the smoke is used in the shutdown process of the coal mill, so that the consumption of fire steam of the mill can be greatly reduced, and the economy of the unit is effectively improved.
Drawings
FIG. 1 is a schematic diagram of a pulverizing system of a mill;
FIG. 2 is a schematic diagram of the system of example 1;
FIG. 3 is a schematic diagram of the system of example 2.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples.
Example 1: as shown in fig. 2, the boiler pulverizing system comprises a hearth 3, a powder pipe quick-closing valve 1, a separator 4, a coal feeder 5, a lower gate door 9, a coal mill body 10, a capacity air door 8, a flue gas air door 11, a cold primary air door 12, a hot primary air door 13, an induced draft fan 14 and a powder pipe 15, wherein the coal feeder 5 is connected with the coal mill body 10 through the lower gate door 9, the coal mill body 10 is connected with the separator 4, the separator 4 is connected with the hearth 3 through the powder pipe 15, and the powder pipe quick-closing valve 1 is arranged on the powder pipe 15; the flue gas air door 11, the cold primary air door 12 and the hot primary air door 13 are connected in parallel and are connected with the capacity air door 8 and the bypass air door 7, the capacity air door 8 is connected to the separator 4, the bypass air door 7 is connected to a feed inlet of the coal feeder 5 connected with the coal mill body 10, and the flue gas air door 11 is connected with an outlet of the induced draft fan 14; the coal mill body 10 is connected with two sets of hearths 3, a separator 4 and a coal feeder 5; the flue gas air door 11 is of a manual, pneumatic or electric type and has the function of automatically adjusting the opening;
example 2: as shown in fig. 3, on the basis of embodiment 1, a booster fan 16 is additionally installed between the outlet of the induced draft fan 14 and the flue gas damper 11, and when the outlet pressure of the induced draft fan is insufficient, the booster fan is increased to increase the flue gas pressure.
Example 3: a control method of a boiler pulverizing system comprises a control method of a start grinding warm grinding working condition and a control method of a stop grinding working condition:
the control method for the starting and warm grinding working condition comprises the following steps:
step one, confirming the outlet temperature t of a draught fan i More than 100 ℃, and the oxygen content is less than 6%;
checking and confirming that the cold primary air door 12 and the hot primary air door 13 are in the closed position;
step three, checking and confirming that the capacity air door 8 is fully opened, and the opening of the bypass air door 7 is 10% -30%;
step four, opening the flue gas air door 11 to be 10%, when the pressure of the mill is more than 2kPa, opening the powder pipe shutter door 1, and simultaneously gradually opening the flue gas air door 11 to enable the wind speed of the powder pipe to be more than 5m/s;
step five, maintaining the opening of the smoke valve 11 until the mill body 10 and the separator 4 are at the outletThe temperature satisfies t o> t min ；
Step six, starting the mill body 10, opening the lower gate plate door 9, gradually closing the flue gas air door 11, opening the cold primary air 12 and the hot primary air door 13, and adjusting the capacity air door 8 and the bypass air door 7 to enable the air speed of the powder tube to be larger than the allowable minimum air speed s min And maintains the outlet temperature t of the separator 4 o Meets the set condition, and the outlet temperature t of the separator 4 o The set conditions are satisfied:
t max >t o >t min
wherein t is max To the maximum allowable temperature of the outlet temperature of the separator 4, t min The minimum allowable temperature for the outlet temperature of the separator (4).
The control method of the grinding stopping working condition comprises the following steps:
step one, confirming the outlet temperature t of a draught fan i Greater than 100 ℃;
step two, closing the lower flashboard door 9, gradually closing the primary heat air door 12, and adjusting the capacity air door 8 and the bypass air door 7 to enable the wind speed of the powder pipe to be larger than the allowable minimum wind speed s min And maintains the outlet temperature t of the separator 4 o Meets the set condition; separator 4 outlet temperature t o The set conditions are satisfied:
t max >t o >t min
wherein t is max To the maximum allowable temperature of the outlet temperature of the separator 4, t min A minimum allowable temperature for the outlet temperature of the separator 4;
step three, when the powder level in the mill body is lower than l 0 When the mill body is stopped, l 0 Allowing the mill body to stop grinding the highest powder level;
step four, gradually closing the cold primary air door 12, the hot primary air door 13, gradually opening the flue gas air door 11, and adjusting the capacity air door 8 and the bypass air door 7 to enable the wind speed of the powder pipe to be larger than the allowable minimum wind speed s min And maintained for more than 15 min.
Step five, closing the powder pipe quick closing valve 1, gradually closing the smoke air door 11 to enable the pressure p of the mill body 10 to be the same m >p b ，p b For furnace pressure, p m Is the pressure in the coal mill.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (6)
1. A boiler pulverizing system, characterized in that: the device comprises a hearth (3), a powder pipe quick-closing valve (1), a separator (4), a coal feeder (5), a lower gate valve (9), a coal mill body (10), a capacity air door (8), a flue gas air door (11), a cold primary air door (12), a hot primary air door (13), an induced draft fan (14) and a powder pipe (15), wherein the coal feeder (5) is connected with the coal mill body (10) through the lower gate valve (9), the coal mill body (10) is connected with the separator (4), the separator (4) is connected with the hearth (3) through the powder pipe (15), and the powder pipe quick-closing valve (1) is arranged on the powder pipe (15); the flue gas air door (11), the cold primary air door (12) and the hot primary air door (13) are connected in parallel and then connected with the capacity air door (8) and the bypass air door (7), the capacity air door (8) is connected to the separator (4), the bypass air door (7) is connected to a feed inlet of the coal feeder (5) connected with the coal mill body (10), and the flue gas air door (11) is connected with an outlet of the induced draft fan (14); the control method of the boiler pulverizing system comprises a control method of a grinding starting and warming working condition and a control method of a grinding stopping working condition;
the control method for the starting and warm grinding working condition comprises the following steps:
step one, confirming the outlet temperature t of a draught fan i More than 100 ℃, and the oxygen content is less than 6%;
checking and confirming that the cold primary air door (12) and the hot primary air door (13) are in the closed position;
checking and confirming that the capacity air door (8) is fully opened, and opening of the bypass air door (7) is 10% -30%;
step four, opening a smoke air door (11) to be 10%, and when the pressure of the mill is more than 2kPa, opening a powder pipe quick-closing door (1) and simultaneously gradually opening the smoke air door (11) to enable the wind speed of the powder pipe to be more than 5m/s;
maintaining the opening of the smoke valve (11) until the outlet temperatures of the mill body (10) and the separator (4) meet t o> t min ；
Step six, starting the mill body (10), opening the lower gate plate door (9), gradually closing the flue gas air door (11), opening the cold primary air door (12) and the hot primary air door (13), and adjusting the capacity air door (8) and the bypass air door (7) to enable the air speed of the powder tube to be larger than the allowable minimum air speed s min And maintaining the outlet temperature t of the separator (4) o Meets the set condition;
the control method for the grinding stopping working condition comprises the following steps:
step one, confirming the outlet temperature t of a draught fan i Greater than 100 ℃;
step two, closing the lower flashboard door (9), gradually closing the primary heat air door (12), adjusting the capacity air door (8) and the bypass air door (7) to enable the wind speed of the powder pipe to be larger than the allowable minimum wind speed s min And maintaining the outlet temperature t of the separator (4) o Meets the set condition;
step three, when the powder level in the mill body (10) is lower than l 0 When the mill body (10), l is stopped 0 Allowing the mill body to stop grinding the highest powder level;
step four, gradually closing a hot air door cold primary air door (12), a hot primary air door (13) and gradually opening a flue gas air door (11), and adjusting a capacity air door (8) and a bypass air door (7) to enable the wind speed of a powder pipe to be larger than the allowable minimum wind speed s min Maintaining for more than 15 min;
step five, closing the powder pipe quick-closing valve (1), gradually closing the smoke air door (11) to enable the pressure p of the mill body (10) m >p b ，p b For furnace pressure, p m Is the pressure in the coal mill.
2. A boiler pulverizing system according to claim 1, wherein: the coal mill body (10) is connected with two sets of hearths (3), a separator (4) and a coal feeder (5).
3. A boiler pulverizing system according to claim 1, wherein: the flue gas air door (11) is of a manual, pneumatic or electric type and has the function of automatically adjusting the opening.
4. A boiler pulverizing system according to claim 1, wherein: a booster fan (16) is additionally arranged between the outlet of the induced draft fan (14) and the flue gas air door (11).
5. A boiler pulverizing system according to claim 1, wherein: in the step six, the outlet temperature t of the separator (4) o The set conditions are satisfied:
t max >t o >t min
wherein t is max Is the maximum allowable temperature of the outlet temperature of the separator (4), t min The minimum allowable temperature for the outlet temperature of the separator (4).
6. A boiler pulverizing system according to claim 5, wherein: in the second step, the outlet temperature t of the separator (4) o The set conditions are satisfied:
t max >t o >t min
wherein t is max Is the maximum allowable temperature of the outlet temperature of the separator (4), t min The minimum allowable temperature for the outlet temperature of the separator (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111523693.9A CN114405640B (en) | 2021-12-14 | 2021-12-14 | Boiler pulverizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111523693.9A CN114405640B (en) | 2021-12-14 | 2021-12-14 | Boiler pulverizing system |
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| Publication Number | Publication Date |
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| CN114405640A CN114405640A (en) | 2022-04-29 |
| CN114405640B true CN114405640B (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111523693.9A Active CN114405640B (en) | 2021-12-14 | 2021-12-14 | Boiler pulverizing system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0938512A (en) * | 1995-07-25 | 1997-02-10 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for primary air control in activating residual coal mill |
| CN204513436U (en) * | 2015-03-10 | 2015-07-29 | 石福军 | A kind of boiler milling system flue gas inerting and purging system |
| CN107855210A (en) * | 2017-12-08 | 2018-03-30 | 西安热工研究院有限公司 | Supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system and method |
| CN109654524A (en) * | 2019-02-20 | 2019-04-19 | 西安西热锅炉环保工程有限公司 | It is a kind of using furnace cigarette as the bin storage type pulverizing system of Single Medium and method |
| CN111520737A (en) * | 2020-06-02 | 2020-08-11 | 西安热工研究院有限公司 | Coal mill outlet temperature control method and system based on furnace smoke inerting |
| CN214974770U (en) * | 2021-04-24 | 2021-12-03 | 华能国际电力股份有限公司井冈山电厂 | Explosion-proof system for pulverizing of thermal power plant |
| CN217725799U (en) * | 2021-12-14 | 2022-11-04 | 贵州创星电力科学研究院有限责任公司 | Boiler powder process system |
-
2021
- 2021-12-14 CN CN202111523693.9A patent/CN114405640B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0938512A (en) * | 1995-07-25 | 1997-02-10 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for primary air control in activating residual coal mill |
| CN204513436U (en) * | 2015-03-10 | 2015-07-29 | 石福军 | A kind of boiler milling system flue gas inerting and purging system |
| CN107855210A (en) * | 2017-12-08 | 2018-03-30 | 西安热工研究院有限公司 | Supercritical unit medium-speed pulverizer outlet temperature optimal control for energy saving system and method |
| CN109654524A (en) * | 2019-02-20 | 2019-04-19 | 西安西热锅炉环保工程有限公司 | It is a kind of using furnace cigarette as the bin storage type pulverizing system of Single Medium and method |
| CN111520737A (en) * | 2020-06-02 | 2020-08-11 | 西安热工研究院有限公司 | Coal mill outlet temperature control method and system based on furnace smoke inerting |
| CN214974770U (en) * | 2021-04-24 | 2021-12-03 | 华能国际电力股份有限公司井冈山电厂 | Explosion-proof system for pulverizing of thermal power plant |
| CN217725799U (en) * | 2021-12-14 | 2022-11-04 | 贵州创星电力科学研究院有限责任公司 | Boiler powder process system |
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| CN114405640A (en) | 2022-04-29 |
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