CN216790230U - Pulverized coal pulverizing device - Google Patents
Pulverized coal pulverizing device Download PDFInfo
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- CN216790230U CN216790230U CN202220399974.1U CN202220399974U CN216790230U CN 216790230 U CN216790230 U CN 216790230U CN 202220399974 U CN202220399974 U CN 202220399974U CN 216790230 U CN216790230 U CN 216790230U
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Abstract
The utility model provides a pulverized coal pulverizing device, which comprises a plurality of raw coal bins, a plurality of coal mills and a vertical descending coal dropping pipe, wherein the raw coal bins are arranged in the coal pulverizing device; a coal feeder, a mixed front coal dropping pipe and a mixed front gate valve are arranged corresponding to each raw coal bin; the outlet of the raw coal bin is connected with the inlet of the vertical descending coal dropping pipe through a corresponding coal feeder and a coal dropping pipe before mixing in sequence; a mixing front gate valve is arranged on the mixing front coal dropping pipe; a mixed back gate valve and a mixed back coal dropping pipe are arranged corresponding to each coal mill; the coal mill is connected with the outlet of the vertical descending coal dropping pipe through the corresponding coal dropping pipe after being mixed; and a mixed rear gate valve is arranged on the mixed rear coal dropping pipe. The utility model realizes the optimal coal quality blending of the direct-fired pulverizing system, more uniform coal powder mixing, improves the combustion stability during low-load operation of the boiler and improves the operation reliability of the unit.
Description
Technical Field
The utility model relates to the technical field of coal powder preparation and conveying application in the mechanical power engineering discipline and power generation industry, in particular to a coal powder making device.
Background
In a coal feeding system of a thermal power plant, a system which takes a coal mill as a core and produces raw coal into qualified coal powder is called a coal pulverizing system. Pulverizing systems can be generally classified into direct-blowing and intermediate storage systems. The direct-blowing type powder making system directly sends pulverized coal ground by the coal grinding machine into the hearth of the boiler for combustion, and has the advantages of simple system, few equipment parts, small resistance of a powder conveying pipeline, low running power consumption, low steel consumption, small occupied space, low investment and small explosion risk, so the direct-blowing type powder making system is favored by a plurality of coal-fired power plants. The direct-fired pulverizing system is usually an isolated pulverizing system, one coal bunker is connected with one coal mill, and one coal mill is connected with a certain number of fixed burners of the boiler, so that when one coal bunker is blocked, the output fluctuation of the coal mill is often caused to influence the stable combustion of the burners. At present, different coals enter different coal bunkers, so different coal mills grind different coals, the blending of the coals is realized by combustion in a hearth, the output fluctuation of the coal mills often influences the blending effect, the combustion condition of a boiler is unstable, the combustion efficiency is low, and the running reliability of a unit is lower.
SUMMERY OF THE UTILITY MODEL
The problems that the boiler combustion condition is unstable, the combustion efficiency is low and the unit operation reliability is low due to the fact that the phenomenon of uneven wind and powder is easy to occur to coal powder of an isolated direct-fired pulverizing system are solved; the utility model provides a pulverized coal pulverizing device, which realizes the optimal coal quality blending of a direct-fired pulverizing system, more uniform pulverized coal mixing and maximized coal blending economic benefit; the combustion stability of the boiler in low-load operation is improved, the combustion efficiency is improved, and the power consumption of a coal mill is effectively reduced; meanwhile, when a single raw coal bunker, a coal feeder and a coal pulverizer break down, the system does not stop to operate, the risk resistance of the coal pulverizing system is enhanced, and the operation reliability of the unit is improved.
The utility model is realized by the following technical scheme:
a coal powder making device comprises a plurality of raw coal bins, a plurality of coal mills and a vertical descending coal dropping pipe;
a coal feeder, a mixed front coal dropping pipe and a mixed front gate valve are arranged corresponding to each raw coal bin; the outlet of the raw coal bin is connected with the inlet of the vertical descending coal dropping pipe through a corresponding coal feeder and a coal dropping pipe before mixing in sequence; a mixing front gate valve is arranged on the mixing front coal dropping pipe;
a mixed back gate valve and a mixed back coal dropping pipe are arranged corresponding to each coal mill; the coal mill is connected with the outlet of the vertical descending coal dropping pipe through a corresponding coal dropping pipe after mixing; and a mixed rear gate valve is arranged on the mixed rear coal dropping pipe.
Preferably, each raw coal bin is provided with an automatic scale, and the raw coal bins are connected with corresponding coal feeders through the corresponding automatic scales.
Preferably, the mixed front gate valve and the mixed rear gate valve are electric gate valves.
Preferably, the raw coal bunker comprises a raw coal bunker A1And raw coal bunker A2The coal mill comprises a coal mill J1And coal mill J2。
Further, corresponding to a raw coal bunker A1Is provided with an automatic platform scale B1Coal feeder C1Coal dropping pipe D before mixing1Mixing front gate valve E1(ii) a Corresponding to the raw coal bunker A2Is provided with a mixed front gate valve E2Coal dropping pipe D before mixing2Coal feeder C2And automatic platform scale B2(ii) a Raw coal bunker A1Automatic weighing scale B1Coal feeder C1Coal dropping pipe D before mixing1Connected with the inlet of a vertical descending coal dropping pipe, a raw coal bunker A2Automatic weighing scale B2Coal feeder C2Coal dropping pipe D before mixing2Is connected with the inlet of the vertical descending coal dropping pipe;
corresponding coal mill J1Is provided with a mixed coal dropping pipe I1Corresponding to coal mill J2Is provided with a mixed coal dropping pipe I2(ii) a Coal mill J1Coal dropping pipe I after mixing1Connected with the outlet of the vertically descending coal dropping pipe, a coal mill J2Coal dropping pipe I after mixing2Is connected with the outlet of the vertical descending coal dropping pipe; coal dropping pipe I after mixing1Is provided with a mixed rear gate valve H1Coal dropping pipe I after mixing2Is provided with a mixed rear gate valve H2。
Further, raw coal bunker A1Automatic platform scale B1Coal feeder C1Coal dropping pipe D before mixing1Front mixed gate valve E1Rear mixed gate valve H1Coal dropping pipe I after mixing1And coal mill J1With raw coal bunker A2Automatic platform scale B2Coal feeder C2Coal dropping pipe D before mixing2Front mixed gate valve E2Rear mixed gate valve H2Coal dropping pipe I after mixing2And coal mill J2The vertical falling coal dropping pipes are symmetrically arranged one by one.
Further, a coal dropping pipe D before mixing1Coal dropping pipe D before mixing2The coal dropping pipe I is connected with the vertical descending coal dropping pipe through a Y-shaped tee joint F and is mixed1Coal dropping pipe I after mixing2And the vertical descending coal dropping pipe is connected with the Y-shaped tee G.
Further, mix preceding slide valve E1Front mixed gate valve E2Rear mixed gate valve H1Mixing rear gate valve H2Are all electric gate valves.
Compared with the prior art, the utility model has the following beneficial effects:
according to the device, the isolated direct-fired pulverizing systems are combined in a specific mode, so that the optimal coal quality blending of the direct-fired pulverizing systems is realized, pulverized coal is mixed more uniformly, the economic benefit of coal blending is maximized, the boiler combustion is more stable, and the combustion efficiency of the boiler is improved; the combustion stability of the boiler in low-load operation is improved, and the power consumption of a coal mill is effectively reduced; meanwhile, when a single raw coal bunker, a coal feeder and a coal pulverizer break down, the system does not stop to operate, the risk resistance of the coal pulverizing system is enhanced, and the operation reliability of the unit is improved.
Drawings
FIG. 1 is a system diagram of a method and apparatus for switching between two raw coal bunkers and two coal mills;
FIG. 2 is a logic control diagram of a method and a device for switching between two raw coal bunkers and two coal mills.
In the figure: 1. raw coal bunker A12 automatic platform scale B 13, coal feeder C14, mix the preceding coal breakage pipe D15, mix the front gate valve E16, Y-shaped tee joints F, 7, Y-shaped tee joints G, 8 and a mixed back gate valve H 19, mixed coal dropping pipe I110 coal pulverizer J 111 coal mill J 212, mixed coal dropping pipe I213, mixing rear gate valve H 214, mixing front gate valve E 215, coal dropping pipe D before mixing216, coal feeder C 217 automatic platform scale B 218, raw coal bunker A2And 19, vertically descending the coal dropping pipe.
Detailed Description
For a further understanding of the utility model, reference will now be made to the following examples, which are provided to illustrate further features and advantages of the utility model, and are not intended to limit the scope of the utility model as set forth in the following claims.
The coal powder making device comprises a plurality of raw coal bins, a plurality of coal mills and a vertically descending coal dropping pipe 19.
An automatic platform scale, a coal feeder, a coal dropping pipe before mixing and an electric gate valve before mixing are arranged corresponding to each raw coal bin; the outlet of the raw coal bin is connected with the inlet of a vertical descending coal dropping pipe 19 through a corresponding automatic platform scale, a coal feeder and a coal dropping pipe before mixing in sequence. The front mixing electric gate valve is arranged on the front mixing coal dropping pipe.
A mixed back gate valve and a mixed back coal dropping pipe are arranged corresponding to each coal mill; the coal mill is connected with the outlet of the vertical descending coal dropping pipe 19 through the corresponding coal dropping pipe after mixing. And a mixed rear gate valve is arranged on the mixed rear coal dropping pipe.
Examples
In this embodiment of the utility model, as shown in FIG. 1, the raw coal bunker includes a raw coal bunker A11 and raw coal bunker A218 coal mill comprising coal mill J 110 and coal mill J 211。
Corresponding to the raw coal bunker A11 is provided with an automatic platform scale B12. Coal feeder C 13. Mix preceding coal breakage pipe D14. Mixed front gate valve E15; corresponding to the raw coal bunker A 218 is provided with a mixed front gate valve E 214. Mix preceding coal breakage pipe D 215. Coal feeder C 216. Automatic platform scale B 217. Raw coal bunker A1Automatic weighing scale B12. Coal feeder C 13. Mix preceding coal breakage pipe D14 is connected with the inlet of a vertical descending coal dropping pipe 19, and a raw coal bunker A 218 warp automatic scale B 217. Coal feeder C 216. Mix preceding coal breakage pipe D 215 is connected with the inlet of a vertical descending coal dropping pipe 19. Mix preceding coal breakage pipe D 215 is provided with a mixed front gate valve E15, coal dropping pipe D before mixing215 is provided with a coal dropping pipe E before mixing214。
Corresponding coal mill J 110 is provided with a mixed coal dropping pipe I 19, corresponding to coal mill J 211 is provided with a mixed coal dropping pipe I212. Coal mill J 110 coal dropping pipe I after mixing19 is connected with the outlet of the vertical descending coal dropping pipe 19. Coal mill J 211 coal dropping pipe I after mixing212 is connected with the outlet of a vertical descending coal dropping pipe 19. Coal dropping pipe I after mixing19 is provided with a mixed back gate valve H18. Coal dropping pipe I after mixing212 is provided with a mixed back gate valve H 213。
As shown in FIG. 1, the raw coal bunker A takes a vertical descending coal dropping pipe 19 as a symmetry axis11. Automatic platform scale B12. Coal feeder C 13. Mix preceding coal breakage pipe D14. Mixed front gate valve E15. Mixed back gate valve H18. Coal dropping pipe I after mixing19 and coal pulverizer J 110 and raw coal bunker A 218. Automatic platform scale B 217. Coal feeder C 216. Mix preceding coal breakage pipe D 215. Mixed front gate valve E 214. Mixing back gate valve H 213. Coal dropping pipe I after mixing212 and coal mill J 211 are arranged symmetrically one by one.
Mix preceding coal breakage pipe D14. Mix preceding coal breakage pipe D 215 and the vertical descending coal dropping pipe 19 are connected through a Y-shaped tee joint F6. Coal dropping pipe I after mixing19. Coal dropping pipe I after mixing212 and the vertical descending coal dropping pipe 19 are connected through a Y-shaped tee joint G7.
In this embodiment, when two raw coal bunkers and two coal mills are in normal operation, raw coal can reach the coal mill J through the following coal conveying line 110、J211：
(1) The coal conveying line 1 is a raw coal secondary raw coal bunker A11. Automatic platform scale B12. Coal feeder C 13. Mix preceding coal breakage pipe D14. Mixed front gate valve E15. Y-shaped three-way F6, vertical descending coal dropping pipe 19, Y-shaped three-way G7 and mixed rear gate valve H18. Mixed coal drop pipe I19 to coal mill J 110；
(2) The coal conveying line 2 is a raw coal secondary raw coal bunker A 218. Automatic platform scale B 217. Coal feeder C 216. Mix preceding coal breakage pipe D 215. Mixed front gate valve E 214. Y-shaped three-way F6, vertical descending coal dropping pipe 19, Y-shaped three-way G7 and mixed rear gate valve H18. Coal dropping pipe I after mixing19. To coal pulverizer J 110；
(3) The coal conveying line 3 is a raw coal secondary raw coal bunker A 218. Automatic platform scale B 217. Coal feeder C 216. Mix preceding coal breakage pipe D 215. Mix preceding slide valve E 214. Y-shaped three-way F6, vertical descending coal dropping pipe 19, Y-shaped three-way G7 and mixed rear gate valve H 213. Coal dropping pipe I after mixing212. To coal pulverizer J 211；
(4) The coal conveying line 4 is a raw coal secondary raw coal bunker A11. Automatic platform scale B12. Coal feeder C 13. Mix preceding coal breakage pipe D14. Mixed front gate valve E15. Y-shaped three-way F6, vertical descending coal dropping pipe 19, Y-shaped three-way G7 and mixed rear gate valve H 213. Coal dropping pipe I after mixing212. To coal pulverizer J 211。
The application method of the embodiment is as follows:
1. when two raw coal bunkers and two coal mills are in normal operation state, the raw coal bunker A11 coal quality is M1Raw coal bunker A 218 has a coal quality of M2By adjusting the electric gate valve E15. Electric gate valve E 214, mixing and blending at a Y-shaped tee F6, and mixing and blending raw coals with different heat values to obtain M coal quality3Mixing the coal; the blended raw coal passes through a vertical descending coal dropping pipe 19 and reaches a Y-shaped tee G7 to be secondarily distributed to a mixed back gate valve H18. Mixed back gate valve H 213 to coal pulverizer J 110. Coal mill J 211。
Coal blending formula: m3＝M1×A1+M2×A2
In the above formula M3For coal quality of mixed coal, M1Is a raw coal bunker A11 coal quality of raw coal, A1For coal quality M of raw coal1The proportion of M2As raw coal bunker A 218 coal quality of raw coal, A2Is coal quality M of raw coal2The proportion of the active carbon is the proportion of the active carbon. The blending proportion is adjusted at any time according to the economic optimality principle.
2. Two raw coal bunkers and two coal mills are in normal operation state, if the condition that the boiler combustion load is lower appears, in order to avoid resource waste caused by 'big horse pulls a trolley', the following strategy can be adopted and is shown in figure 2:
(1) closing the mixing back gate valve H18, coal mill J stopped1And 10, maintaining the normal work of the single systems of the coal conveying lines 3 and 4.
(2) Closing the mixing back gate valve H 213, coal pulverizer J out of service2And 11, maintaining the normal work of the single systems of the coal conveying lines 1 and 2.
3. When the two raw coal bunkers and the two coal mills are in abnormal operation states, an abnormal working condition occurs before blending, and the following strategy can be adopted as shown in figure 2:
(1) if raw coal bunker A11. Mix preceding coal breakage pipe D14 coal blockage, coal breakage or coal feeder C 13 is out of orderIn the meantime, the device immediately closes the mixing front gate valve E1And 5, isolating the potential safety hazards of the coal conveying lines 1 and 4, and enabling the coal conveying lines 2 and 3 to still work normally.
(2) If raw coal bunker A 218. Mix preceding coal breakage pipe D 115 coal blockage, coal breakage or coal feeder C 216 when the device fails, the device immediately closes the mixed front gate valve E2And 14, isolating the potential safety hazards of the coal conveying lines 2 and 3, and enabling the coal conveying lines 1 and 4 to still work normally.
4. When the two raw coal bunkers and the two coal mills are in abnormal operation states, abnormal working conditions occur after blending, and the following strategies can be adopted as shown in the figure 2:
(1) coal pulverizer J 110 sudden failure can not run, the device immediately closes the mixed back gate valve H18, stopping running the coal conveying lines 1 and 2; at this time, the coal conveying lines 3 and 4 can still work normally.
(2) Coal pulverizer J 211 sudden failure can not run, the device immediately closes the mixing back gate valve H 213, stopping running the coal conveying lines 3 and 4; meanwhile, the coal conveying lines 1 and 2 can still work normally.
The device combines the isolated coal pulverizing systems in a symmetrical arrangement mode to form 4 mutually independent coal conveying lines, automatically controls the opening of the electric gate valve before mixing, solves the technical problems of the coal chute coal plugging coal feeder in fault operation, coal blending, coal mill fault, low-load operation and the like, realizes the optimal coal quality blending of the direct-blowing coal pulverizing system, more uniform coal powder mixing and realizes the maximization of the economic benefit of coal blending; the combustion stability of the boiler in low-load operation is improved, and the power consumption of a coal mill is effectively reduced; meanwhile, when a single raw coal bunker, a coal feeder and a coal pulverizer break down, the system does not stop to operate, so that the risk resistance of the coal pulverizing system is enhanced, and the reliability of the unit is greatly improved.
Claims (8)
1. A coal powder making device is characterized by comprising a plurality of raw coal bins, a plurality of coal mills and a vertical descending coal dropping pipe (19);
a coal feeder, a mixed front coal dropping pipe and a mixed front gate valve are arranged corresponding to each raw coal bin; the outlet of the raw coal bin is connected with the inlet of a vertical descending coal dropping pipe (19) through a corresponding coal feeder and a coal dropping pipe before mixing in sequence; a mixing front gate valve is arranged on the mixing front coal dropping pipe;
a mixed back gate valve and a mixed back coal dropping pipe are arranged corresponding to each coal mill; the coal mill is connected with the outlet of the vertical descending coal dropping pipe (19) through the corresponding coal dropping pipe after being mixed; and a mixed rear gate valve is arranged on the mixed rear coal dropping pipe.
2. The coal dust pulverizing apparatus of claim 1 wherein each raw coal bunker is provided with an automatic scale, and the raw coal bunkers are connected to corresponding coal feeders via the corresponding automatic scales.
3. The coal dust pulverizing apparatus according to claim 1, wherein the mixing front gate valve and the mixing rear gate valve are both electric gate valves.
4. The coal fines process apparatus of claim 1, wherein the raw coal bunker comprises raw coal bunker a1(1) And raw coal bunker A2(18) The coal mill comprises a coal mill J1(10) And coal mill J2(11)。
5. The coal dust pulverizing apparatus of claim 4 wherein the corresponding raw coal bunker A1(1) Is provided with an automatic platform scale B1(2) Coal feeder C1(3) Coal dropping pipe D before mixing1(4) Mixing front gate valve E1(5) (ii) a Corresponding to the raw coal bunker A2(18) Is provided with a mixed front gate valve E2(14) Coal dropping pipe D before mixing2(15) Coal feeder C2(16) And automatic platform scale B2(17) (ii) a Raw coal bunker A1(1) Automatic weighing scale B1(2) Coal feeder C1(3) Coal dropping pipe D before mixing1(4) Connected with the inlet of a vertical descending coal dropping pipe (19), a raw coal bunker A2(18) Automatic weighing scale B2(17) Coal feeder C2(16) Coal dropping pipe D before mixing2(15) Is connected with the inlet of the vertical descending coal dropping pipe (19);
corresponding coal mill J1(10) Is provided with a mixed coal dropping pipe I1(9) Corresponding to coal mill J2(11) Is provided with a mixed coal dropping pipe I2(12) (ii) a Coal mill J1(10) Coal dropping pipe I after mixing1(9) Connected with the outlet of a vertical descending coal dropping pipe (19) and a coal mill J2(11) Coal dropping pipe I after mixing2(12) Is connected with the outlet of the vertical descending coal dropping pipe (19); coal dropping pipe I after mixing1(9) Is provided with a mixed rear gate valve H1(8) Coal dropping pipe I after mixing2(12) Is provided with a mixed rear gate valve H2(13)。
6. The coal fines pulverizing apparatus as claimed in claim 5, characterized in that the raw coal bunker A1(1) Automatic platform scale B1(2) Coal feeder C1(3) Coal dropping pipe D before mixing1(4) Front mixed gate valve E1(5) Rear mixed gate valve H1(8) Coal dropping pipe I after mixing1(9) And coal mill J1(10) With raw coal bunker A2(18) Automatic platform scale B2(17) Coal feeder C2(16) Coal dropping pipe D before mixing2(15) Front mixed gate valve E2(14) Rear mixed gate valve H2(13) Coal dropping pipe I after mixing2(12) And coal mill J2(11) Are symmetrically arranged one by one about the vertical descending coal dropping pipe (19).
7. The coal dust pulverizing apparatus of claim 5 wherein the coal dropping pipe D before mixing1(4) Coal dropping pipe D before mixing2(15) Is connected with a vertical descending coal dropping pipe (19) through a Y-shaped tee joint F (6), and a mixed coal dropping pipe I1(9) Coal dropping pipe I after mixing2(12) And the vertical descending coal dropping pipe (19) is connected with a Y-shaped tee joint G (7).
8. The coal dust pulverizing apparatus of claim 5 wherein the mixing front gate valve E1(5) Front mixed gate valve E2(14) Rear mixed gate valve H1(8) Mixing back gate valve H2(13) Are all electric gate valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220399974.1U CN216790230U (en) | 2022-02-24 | 2022-02-24 | Pulverized coal pulverizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220399974.1U CN216790230U (en) | 2022-02-24 | 2022-02-24 | Pulverized coal pulverizing device |
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| Publication Number | Publication Date |
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| CN216790230U true CN216790230U (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220399974.1U Active CN216790230U (en) | 2022-02-24 | 2022-02-24 | Pulverized coal pulverizing device |
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- 2022-02-24 CN CN202220399974.1U patent/CN216790230U/en active Active
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