CN220250060U - Anthracite coal generating set pulverizing system - Google Patents
Anthracite coal generating set pulverizing system Download PDFInfo
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- CN220250060U CN220250060U CN202320917955.8U CN202320917955U CN220250060U CN 220250060 U CN220250060 U CN 220250060U CN 202320917955 U CN202320917955 U CN 202320917955U CN 220250060 U CN220250060 U CN 220250060U
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- 239000003245 coal Substances 0.000 title claims abstract description 97
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000003830 anthracite Substances 0.000 title claims abstract description 47
- 238000010298 pulverizing process Methods 0.000 title claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims description 12
- 238000003801 milling Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000002817 coal dust Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 238000000498 ball milling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
The utility model relates to a pulverizing system of an anthracite generator set, which comprises a raw coal bin, a coal feeder, a BRM vertical mill and a W-flame double-arch combustion boiler which are sequentially connected. The scheme fundamentally solves the problems of low unit efficiency, high power consumption, high noise, high environmental protection emission standard reaching difficulty, poor economy, poor unit peak regulation flexibility and the like in the prior art scheme specified by the current national standard, can greatly save the initial investment cost of equipment, greatly reduce the station service efficiency of an anthracite power plant, reduce the coal consumption of the anthracite power plant, reduce the lowest steady burning load level of a W flame boiler and save the whole space occupation.
Description
Technical Field
The utility model belongs to the field of power engineering, and particularly relates to a pulverizing system of an anthracite generator set.
Background
The areas such as Guizhou, shanxi and the like in China store abundant anthracite resources, but the anthracite resources are difficult to burn due to low volatile components of the non-coal. At present, anthracite coal specified by national standards is mainly used for power generation by adopting two technical routes, namely a W flame furnace is matched with a double-inlet double-tapping ball milling powder manufacturing system technology; and secondly, circulating fluidized bed boiler technology. For a long time, no matter which technical route is adopted, the problems of low unit efficiency, high power consumption, high noise, high environmental protection emission standard reaching difficulty, poor economy, poor unit peak regulation flexibility and the like of the coal-fired power plant are commonly existed.
For example, a W flame furnace is matched with a double-inlet double-tapping ball milling powder making system, and one of the main technical points is that coal powder with fineness meeting the required requirements is ground into coal powder by a steel ball coal mill, so that the ignition capability of the anthracite coal powder is improved, and the anthracite coal powder can be fully combusted. But the steel ball coal mill has the obvious defects of complex operation, high electricity consumption, high noise, high steel consumption, high abrasion and the like. The other existing coal mills such as medium speed coal mills are superior to steel ball coal mills in noise, electricity consumption and the like, but the non-combustible coal with higher hardness cannot be ground to the required fineness, so that the coal mill cannot be applied to an anthracite power generation system. Therefore, the prior art is adopted in the prior coal-fired power plants according to the national standard.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the anthracite generating set pulverizing system solves the problems of low efficiency, high power consumption, high noise, high environmental protection emission standard difficulty, poor economy, poor peak regulation flexibility and the like of a set in the prior art scheme specified by national standards.
According to the technical scheme, the utility model provides a pulverizing system of an anthracite generating set, which comprises a raw coal bin, a coal feeder, a BRM vertical mill and a W-flame double-arch combustion boiler which are sequentially connected.
Further, the output end of the raw coal bin is connected with the input end of the coal feeder through a first raw coal pipeline with a first electric coal valve, the output end of the coal feeder 2 is connected with the input end of the BRM vertical mill through a second raw coal pipeline with a second electric coal valve, and the output end of the BRM vertical mill is connected to the input end of the W-flame double-arch combustion boiler through a coal powder pipeline.
Preferably, each BRM vertical mill is connected with a plurality of mutually independent pulverized coal pipes, the pulverized coal pipes are respectively connected with a plurality of input ends of the W-flame double-arch combustion boiler, and the plurality of input ends of the W-flame double-arch combustion boiler are uniformly distributed at intervals in the length direction of the W-flame double-arch combustion boiler.
Preferably, a plurality of BRM vertical mills are arranged in parallel independently, and the pulverized coal pipelines of the BRM vertical mills are connected to the same W-flame double-arch combustion boiler.
Preferably, a rapid turn-off door, an adjustable shrinkage cavity and a compensator are sequentially arranged on the pulverized coal pipeline in the direction from the BRM vertical mill to the W-flame double-arch combustion boiler; a manual air door is arranged at one end of the pulverized coal pipeline close to the W-flame double-arch combustion boiler.
Compared with the prior art, the utility model has the following beneficial technical effects:
1. the anthracite generating set pulverizing system adopts the BRM vertical mill to replace double-inlet double-outlet ball milling, and can greatly save the initial investment cost of coal mill equipment.
2. The anthracite power generating set pulverizing system can greatly reduce the station utilization rate of an anthracite power plant and reduce the coal consumption of the anthracite power plant.
3. The anthracite generating set pulverizing system can reduce the lowest stable combustion load level of the W flame boiler.
4. The anthracite generating set pulverizing system can save the volume occupation of coal bins, and the occupation of BRM vertical mill is smaller than that of double-inlet double-outlet steel ball milling, so that the whole occupation of space is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present utility model.
Reference numerals in the drawings illustrate:
1. raw coal bin; 2. a coal feeder; 3. BRM vertical mill; 4. w-flame double arch combustion boiler.
Detailed Description
The utility model provides a pulverizing system of an anthracite generator set, which solves the problems of low efficiency, high power consumption, high noise, high environmental protection emission standard difficulty, poor economy, poor peak regulation flexibility and the like of the generator set in the prior art scheme specified by national standards.
Referring to fig. 1, the utility model provides a pulverizing system of an anthracite generator set, in particular to a positive pressure medium speed mill direct-fired pulverizing system of a W-flame double-arch combustion boiler of an anthracite power plant.
Specifically, the anthracite generating set pulverizing system comprises a raw coal bin 1, a coal feeder 2, a BRM vertical mill 3 and a W-flame double-arch combustion boiler 4 which are connected in sequence through pipelines. Anthracite is stored in the raw coal bin 1, and the output end of the raw coal bin 1 is connected with the input end of the coal feeder 2 through a first raw coal pipeline with a first electric coal valve. The coal feeder 2 is used for conveying anthracite coal from the raw coal bunker 1 to the BRM vertical mill 3. The output end of the coal feeder 2 is connected with the input end of the BRM vertical mill 3 through a second raw coal pipeline with a second electric coal valve. The BRM vertical mill 3 is used for grinding the block-shaped smokeless coal input into the BRM vertical mill into pulverized coal with required fineness. The output end of the BRM vertical mill 3 is connected to the input end (burner) of the W-flame double arch combustion boiler 4 through a pulverized coal pipe.
Preferably, each BRM vertical mill 3 is connected with a plurality of (e.g. four or six) coal dust pipelines which are mutually independent, and further is respectively connected with a plurality of (e.g. four or six) input ends of the W-flame double-arch combustion boiler 4, and the plurality of input ends are uniformly distributed at intervals in the length direction of the W-flame double-arch combustion boiler 4, so that coal dust is more uniform. Further preferably, one raw coal bin 1, one coal feeder 2 and one BRM vertical mill 3 which are connected are a group, and a plurality of groups (such as six groups) which are mutually independent are arranged in parallel in a pulverizing system of an anthracite generating set and are respectively connected to the same W-flame double-arch combustion boiler 4, so that thirty-six input ports on the W-flame double-arch combustion boiler 4 are respectively connected with the six BRM vertical mills 3 in a staggered manner at intervals by taking the structure shown in fig. 1 as an example, for example, three BRM vertical mills 3 are connected to one side of the W-flame double-arch combustion boiler 4, and the other three BRM vertical mills 3 are connected to the other side of the W-flame double-arch combustion boiler 4.
Preferably, a quick shut-off gate, an adjustable shrinkage cavity and a compensator are arranged on each pulverized coal pipeline connected to the W-flame double-arch combustion boiler 4 by the BRM vertical mill 3 in sequence. The adjustable shrinkage cavity is used for adjusting the balance of the wind pressure of the pulverized coal in the pipeline and guaranteeing the combustion stability of the W-flame double-arch combustion boiler 4. And a compensator is arranged at the downstream side of the adjustable shrinkage cavity so as to ensure the uniformity of the thermal expansion of the whole pulverized coal pipeline. The tail end of the pulverized coal pipeline is connected with the burner at the input end of the W-flame double-arch combustion boiler 4 through a manual air door, so that the communication and sealing blocking effects are ensured.
More specifically, the powder making system adopts a positive pressure direct blowing powder making system, and the smoke and air system adopts a balanced ventilation mode and mainly comprises a blower, a primary fan, an air preheater, a sealing fan, a communicated air duct and the like. And silencers are arranged on the inlet air channels of the blower and the primary air blower. The secondary air enters a secondary air box of the W-flame double-arch combustion boiler 4 after passing through the blower and the air preheater. The primary air is divided into two paths before entering the air preheater, and one path is heated by the air preheater and then communicated to the BRM vertical mill 3 to be used as hot air for pulverizing the BRM vertical mill 3; the other path is directly communicated to the BRM vertical mill 3 without an air preheater and is used as temperature regulating air of the BRM vertical mill 3 to regulate the medium temperature at the outlet (namely, the output end connected with a coal powder pipeline) of the BRM vertical mill 3. A cold primary air pipe is arranged in front of the inlet of the BRM vertical mill 3, one path of sealing air is led out of the cold primary air pipe and used as sealing air of the coal feeder 2, and the other path of sealing air is led out of the cold primary air pipe and is boosted by a sealing fan and then used as sealing air of the BRM vertical mill 3.
In addition, the conventional anthracite coal fired power plant burns anthracite coal, and the coal dust at the outlet of the coal mill is required to be not only fine, but also the temperature is required to reach 110-120 ℃ because of too low volatile components. When BRM vertical mills are used in the chemical industry, the outlet temperature is typically 100 ℃ due to process variations. Therefore, under the condition of applying the mill type to the coal-fired thermal power plant, the optimization and improvement of the material of the part contacted with the coal dust of the BRM vertical mill can be considered, for example, a metal material with higher temperature resistance is adopted, so that the temperature rise of about 20 ℃ is adapted, and the service life of equipment is further prolonged.
The utility model is characterized in that the double-inlet and double-outlet steel ball coal mill in the anthracite generator set pulverizing system specified by national standards is replaced by BRM vertical mill, thereby greatly improving the problems of high engineering initial investment, high power consumption, large noise, large occupied area and the like in the prior art scheme, realizing the same or even better pulverized coal effect and obtaining anthracite pulverized coal with required fineness. Because anthracite has low volatile matter, relatively high fixed carbon content and poor burnout property, the coal-fired power plant has high requirements on the fineness of coal dust of the coal quality, the coal dust is required to be ground into fine powder, and the fineness R90 of the coal dust is required to be 4-6% generally, which is difficult to achieve for a medium-speed coal mill used in a conventional thermal power plant. The BRM vertical mill is an existing device adopted in the chemical mining industry, is far away from the technical field, and the inventor discovers that the grinding capability of the existing BRM vertical mill can grind the smokeless coal to the fineness equivalent to that of a double-inlet double-outlet coal mill in the technical exchange process, is not tried in a coal-fired power plant, can be applied to the coal-fired power plant, is likely to become a new scheme which has great influence on future development in the field of anthracite thermal power plants, has guiding significance on optimization and improvement of national standards, and has extremely high practical value.
More specifically, the advantageous technical effects of the present utility model are mainly exhibited in, for example, the following aspects.
1. The anthracite generating set pulverizing system adopts the BRM vertical mill to replace double-inlet double-outlet ball milling, and can greatly save the initial investment cost of coal mill equipment. Taking a domestic 660MW ultra-supercritical unit as an example, if each boiler is provided with 6 double-inlet double-outlet steel ball coal mills, each coal mill is about 900 ten thousand yuan; if BRM vertical mill is adopted, the price of each unit is about 600 ten thousand yuan, the initial investment of each unit can be saved by 1800 ten thousand yuan, and the method has great economic benefit for the capital construction project.
2. The anthracite power generating set pulverizing system can greatly reduce the station utilization rate of an anthracite power plant and reduce the coal consumption of the anthracite power plant. Due to the structure type of the double-inlet double-outlet coal mill commonly adopted by the anthracite thermal power plant, the power consumption is high, and the plant power utilization rate of the anthracite thermal power plant is high. Taking a domestic 660MW ultra-supercritical unit as an example, if each boiler is provided with 6 double-inlet and double-outlet steel ball coal mills, the electric power of each coal mill is about 1900KW; if the BRM vertical mill is adopted, the electric power is about 990KW, the electricity consumption can be saved by about 50 percent, the breakthrough is made, and the possibility of breakthrough improvement is provided for the coal consumption of the anthracite power plant. For two 660MW ultra-supercritical units, the station power consumption is reduced by about 1%, the coal consumption is reduced by about 3g, and the energy-saving effect on the operation stage of the anthracite power plant is great.
3. The anthracite generating set pulverizing system can reduce the lowest stable combustion load level of the W flame boiler.
4. The anthracite generating set pulverizing system can save the volume occupation of coal bins, and the occupation of BRM vertical mill is smaller than that of double-inlet double-outlet steel ball milling, so that the whole occupation of space is greatly reduced.
Claims (4)
1. The anthracite generating set pulverizing system is characterized by comprising a raw coal bin (1), a coal feeder (2), a BRM vertical mill (3) and a W-flame double-arch combustion boiler (4) which are sequentially connected;
the output end of the raw coal bin (1) is connected with the input end of the coal feeder (2) through a first raw coal pipeline with a first electric coal valve, the output end of the coal feeder (2) is connected with the input end of the BRM vertical mill (3) through a second raw coal pipeline with a second electric coal valve, and the output end of the BRM vertical mill (3) is connected to the input end of the W-flame double-arch combustion boiler (4) through a coal powder pipeline.
2. The anthracite generating set pulverizing system according to claim 1, wherein each BRM vertical mill (3) is connected with a plurality of mutually independent pulverized coal pipes, the pulverized coal pipes are respectively connected with a plurality of input ends of the W-flame double-arch combustion boiler (4), and the plurality of input ends of the W-flame double-arch combustion boiler (4) are uniformly distributed at intervals in the length direction of the W-flame double-arch combustion boiler (4).
3. The anthracite generating set pulverizing system according to claim 2, wherein a plurality of BRM vertical mills (3) are arranged in parallel independently of each other, and pulverized coal pipes of the BRM vertical mills (3) are connected to the same W-flame double-arch combustion boiler (4).
4. An anthracite electric generator set milling system according to any one of claims 1-3, characterized in that a rapid shut-off gate, an adjustable shrinkage cavity and a compensator are arranged on the pulverized coal pipeline in sequence in the direction from the BRM vertical mill (3) to the W-flame double-arch combustion boiler (4); a manual air door is arranged at one end of the pulverized coal pipeline, which is close to the W-flame double-arch combustion boiler (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320917955.8U CN220250060U (en) | 2023-04-21 | 2023-04-21 | Anthracite coal generating set pulverizing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320917955.8U CN220250060U (en) | 2023-04-21 | 2023-04-21 | Anthracite coal generating set pulverizing system |
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| Publication Number | Publication Date |
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| CN220250060U true CN220250060U (en) | 2023-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320917955.8U Active CN220250060U (en) | 2023-04-21 | 2023-04-21 | Anthracite coal generating set pulverizing system |
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2023
- 2023-04-21 CN CN202320917955.8U patent/CN220250060U/en active Active
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