CN217725799U - Boiler powder process system - Google Patents
Boiler powder process system Download PDFInfo
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- CN217725799U CN217725799U CN202123131925.4U CN202123131925U CN217725799U CN 217725799 U CN217725799 U CN 217725799U CN 202123131925 U CN202123131925 U CN 202123131925U CN 217725799 U CN217725799 U CN 217725799U
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- air door
- coal
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- powder pipe
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Abstract
The utility model discloses a boiler powder process system, including furnace, powder pipe fast closing valve, separator, feeder, lower flashboard door, coal pulverizer body, capacity air door, flue gas air door, cold primary air door, hot primary air door, draught fan and powder pipe, the feeder links to each other with the coal pulverizer body through lower flashboard door, the coal pulverizer body links to each other with the separator, the separator links to each other with furnace through the powder pipe, install powder pipe fast closing valve 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 collected 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 and the coal pulverizer body, and the flue gas air door is connected with an outlet of the induced draft fan. The utility model discloses having inserted the flue gas of draught fan export, effectively having solved boiler coal pulverizer and powder pipe easily take place the problem of burning, deflagration when burning the big coal type of volatile component, the safe operation of guarantee powder process system.
Description
Technical Field
The utility model relates to a thermal power factory boiler coal pulverizer safe operation technical field, concretely relates to boiler powder process system.
Background
Warm when mill opens in thermal power factory boiler powder process system and grinds and stop to grind and sweep be indispensable process, and the boiler needs adopts different powder process systems according to different coal types, if the coal type with design mismatch, easily arouse accidents such as powder process system burning, explosion, cause huge economic loss and bring great potential safety hazard.
After a thermal power plant operates for a period of time, under the influence of factors such as the productivity, price and policy of the original design coal source, the actual coal types for burning are often far from the design coal types, and particularly, the coal pulverizing system originally designed for anthracite and meager coal types is easy to generate the conditions of combustion, explosion and the like of the coal pulverizing system due to the fact that the ignition point temperature of coal is reduced and the pulverized coal pulverizing system is easy to generate because of the increase of volatile components when bituminous coal is burned.
At present, the research on the powder process system is mainly used for optimizing control, the safety brought by using different coal types is also mainly optimized from the control flow, and the problems of combustion and deflagration of the powder process system cannot be fundamentally solved. For example, in chinese patent applications (application numbers 201410102580.5 and 201310746551.8), the optimization of flow and parameter control is performed on the basis of the conventional coal pulverizing system to achieve the purpose of operating economy of the boiler, and the optimization of different coal types is not performed on the basis of the coal pulverizing system.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the utility model provides a boiler powder process system to solve the boiler powder process system that exists among the prior art coal pulverizer and the burning of powder pipe, the problem of detonation that probably takes place when burning with not matching with the design coal type.
The utility model discloses the technical scheme who takes does: a boiler powder-making system comprises a hearth, a powder pipe quick-closing valve, a separator, a coal feeder, a lower gate plate door, a coal mill body, a capacity air door, a smoke 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 mill body through the lower gate plate door; the flue gas air door, the cold primary air door and the hot primary air door are connected in parallel and collected 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 and the coal pulverizer 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 the two hearths, the separator and the coal feeder.
Preferably, the smoke damper is of a manual type, a pneumatic type or an 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 damper.
The utility model has the advantages that: compared with the current coal mill pulverizing system, the system has access to the medium-high temperature and low-oxygen-content flue gas at the outlet of the induced draft fan, warm grinding is carried out through the flue gas in the starting process of the coal mill, purging is carried out through the flue gas in the shutdown process of the coal mill, the problems that the coal pulverizing system is easy to burn and deflagrate when non-designed coal is used are effectively solved, and the safe operation of the coal pulverizing system is guaranteed. Simultaneously, this flue gas is used for the outage in-process of coal pulverizer, can reduce the use amount of mill fire control steam by a wide margin, effectively improves unit economic nature.
Drawings
FIG. 1 is a schematic diagram of a pulverizing system of a primary mill;
FIG. 2 is a schematic view of a system according to embodiment 1;
FIG. 3 is a schematic view of a system according to embodiment 2.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 2, a boiler pulverizing system comprises a furnace 3, a powder pipe quick-closing valve 1, a separator 4, a coal feeder 5, a lower shutter 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 shutter door 9, the coal mill body 10 is connected with the separator 4, the separator 4 is connected with the furnace 3 through the powder pipe 15, and the powder pipe quick-closing valve 1 is installed on the powder pipe 15; a flue gas air door 11, a cold primary air door 12 and a hot primary air door 13 are connected in parallel and collected to be connected with a capacity air door 8 and a bypass air door 7, the capacity air door 8 is connected to a separator 4, the bypass air door 7 is connected to a feed port where a coal feeder 5 is connected with a coal mill body 10, and the flue gas air door 11 is connected with an outlet of a draught fan 14; the coal mill body 10 is connected with two sets of hearths 3, separators 4 and coal feeders 5; the smoke damper 11 is of a manual type, a pneumatic type or an electric type and has the function of automatically adjusting the opening degree;
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 added to increase the flue gas pressure.
Example 3: a control method of a boiler pulverizing system comprises a control method of a grinding starting warm grinding working condition and a control method of a grinding stopping working condition:
the control method for the starting-up and warm-grinding working condition comprises the following steps:
step one, confirming outlet temperature t of induced draft fan i The oxygen content is less than 6 percent at the temperature of more than 100 ℃;
step two, checking and confirming that the cold primary air door 12 and the hot primary air door 13 are in the closed positions;
step three, checking and confirming that the capacity air door 8 is fully opened, and the opening degree of the bypass air door 7 is 10-30%;
opening the opening of the smoke damper 11 to 10%, opening the powder pipe to quickly close the door 1 when the pressure of the mill is greater than 2kPa, and simultaneously gradually opening the smoke damper 11 to ensure that the air speed of the powder pipe is greater than 5m/s;
step five, maintaining the opening degree of the flue gas gate 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 shutter 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 pipe to be larger than the allowable minimum air speed s min And maintaining the outlet temperature t of the separator 4 o The temperature t at the outlet of the separator 4 meets the set conditions o The set conditions are met as follows:
t max >t o >t min
in the formula, t max Is the maximum allowable temperature, t, of the outlet temperature of the separator 4 min The minimum allowable temperature of the outlet temperature of the separator (4).
The control method for the grinding stop working condition comprises the following steps:
step one, confirming the outlet temperature t of the induced draft fan i Greater than 100 ℃;
step two, closing the lower shutter door 9, gradually closing the primary hot air door 12, adjusting the capacity air door 8 and the bypass air door 7 to enable the air speed of the powder pipe to be larger than the allowable minimum air speed s min And maintaining the outlet temperature t of the separator 4 o Set conditions are met; outlet temperature t of separator 4 o The set conditions are met:
t max >t o >t min
in the formula, t max Is the maximum allowable temperature, t, of the outlet temperature of the separator 4 min The 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 While stopping the operation of the mill body, /) 0 The highest powder level is allowed to stop grinding for the grinder body;
step four, gradually closing the hot air door and the cold primary air door 12, the hot primary air door 13, gradually opening the smoke air door 11, and adjusting the capacity air door 8 and the bypass air door 7 to enable the air speed of the powder pipe to be larger than the allowable minimum air speed s min And maintaining for more than 15 min.
Step five, closing the powder pipe quick closing valve 1, gradually closing the smoke air door 11 to ensure that the pressure p of the mill body 10 is enabled m >p b ，p b Is the furnace pressure, p m The pressure in the coal mill.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention, therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides a boiler powder process system which 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 flashboard 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 flashboard 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 (15) is provided with the powder pipe quick-closing valve (1); flue gas air door (11), cold primary air door (12) and hot primary air door (13) link to each other with capacity air door (8), bypass air door (7) after parallelly connected collecting, and capacity air door (8) are connected to separator (4), and bypass air door (7) are connected to the feed inlet that feeder (5) and coal pulverizer body (10) are connected, and flue gas air door (11) link to each other with draught fan (14) export.
2. The boiler pulverizing system of claim 1, wherein: the coal mill body (10) is connected with the two sets of hearths (3), the separator (4) and the coal feeder (5).
3. The boiler pulverizing system of claim 1, wherein: the smoke damper (11) is of a manual type, a pneumatic type or an electric type and has the function of automatically adjusting the opening degree.
4. The boiler pulverizing system of claim 1, wherein: a booster fan (16) is additionally arranged between the outlet of the induced draft fan (14) and the smoke air door (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123131925.4U CN217725799U (en) | 2021-12-14 | 2021-12-14 | Boiler powder process system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123131925.4U CN217725799U (en) | 2021-12-14 | 2021-12-14 | Boiler powder process system |
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| CN217725799U true CN217725799U (en) | 2022-11-04 |
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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 |
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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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