CN113457831A - Coal mill outlet temperature control method - Google Patents
Coal mill outlet temperature control method Download PDFInfo
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- CN113457831A CN113457831A CN202110737824.7A CN202110737824A CN113457831A CN 113457831 A CN113457831 A CN 113457831A CN 202110737824 A CN202110737824 A CN 202110737824A CN 113457831 A CN113457831 A CN 113457831A
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- 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
Abstract
The invention relates to a coal mill outlet temperature control method, the temperature value detected by a temperature measuring component is transmitted to a controller by an instruction TE-T0, then the controller controls the opening degree of a cold air door and a hot air door and the actual coal grinding speed of a coal mill according to a preset program method to adjust the temperature at the outlet of the coal mill, when the cold air door and the hot air door do not act according to the instruction of the control component or the temperature can not be automatically adjusted, the cold air door or the hot air door is forcibly closed by manual control, the problem that the coal mill outlet temperature is too high, the spontaneous combustion phenomenon of a coal pulverizing system can be caused, and the coal powder explosion can cause safety accidents is solved; or the temperature at the outlet of the coal mill is too low, the coal cannot be dried sufficiently, so that the problems of difficult pulverization, poor coal powder fluidity, influence on coal powder conveying and even powder accumulation and blockage are caused; meanwhile, the method for coordinately adjusting the opening degree of the cold and hot air door and the coal grinding speed of the coal mill is combined, so that the real-time and full-process automatic control of the outlet temperature of the coal mill is realized.
Description
Technical Field
The invention belongs to the field of coal-fired power generation, and particularly relates to a coal mill outlet temperature control method.
Background
For the operation of a coal mill, the outlet temperature is an important parameter to be controlled in the thermal state operation, and the high outlet temperature of the coal mill can cause the spontaneous combustion phenomenon of a powder preparation system, so that the coal powder explosion can cause safety accidents, even the negative pressure fluctuation of a hearth is large, and the MFT signal is generated to cause the fire extinguishing of a boiler; the outlet temperature of the coal mill is too low, coal cannot be sufficiently dried, powder making is difficult, the flowability of coal powder is poor, coal powder conveying is influenced, and even powder accumulation and blockage can be caused.
Disclosure of Invention
The invention aims to provide a method for controlling the outlet temperature of a coal mill, so as to realize the real-time and full-process automatic control of the outlet temperature of the coal mill.
In order to achieve the purpose, the invention adopts the technical scheme that:
a coal mill outlet temperature control method is characterized in that a cold air door for controlling the size of cold air introduced into a coal mill and a hot air door for controlling the size of hot air introduced into the coal mill are arranged at an inlet of the coal mill, and the method comprises the following steps:
the coal mill is provided with a control part and a temperature measuring part, the control part is used for controlling the opening degree of a cold air door, the opening degree of a hot air door and the coal milling speed of the coal mill, the temperature measuring part is arranged at the outlet of the coal mill and connected with the control part, and the temperature measuring part is used for measuring the actual outlet temperature T0 of the coal mill and feeding back the actual outlet temperature T0 to the control part;
according to the type of coal ground by the coal mill, setting a lower outlet temperature limit T1 for safe operation of the coal mill and an upper outlet temperature limit T2 for safe operation of the coal mill, wherein T1 is more than T2, the control part controls the actual outlet temperature of the coal mill to be T1 or less than T0 or less than T2 by adjusting the opening degree of a cold air door and a hot air door, and when T0 is more than T1, the control part controls to increase the opening degree of a hot air door, reduce the opening degree of the cold air door or manually close the cold air door; when T2 is not more than T0, the control part controls the opening of the cold air door to be increased, the opening of the hot air door to be decreased or the hot air door to be manually closed;
setting the initial coal feeding quantity QD of the coal mill, the actual coal grinding speed of the coal mill as N, setting the actual outlet temperature of the coal mill to be T0 which is more than or equal to T1 and less than T2, setting QD = Nt/h, and when T0 is more than T1, increasing the actual coal grinding speed by the control part; when T2 is less than or equal to T0, the control part reduces the actual coal grinding speed.
Preferably, the adjusting lower limit temperature T3 is set, T3 < T1, and when T0 < T3, the control part controls the hot air door to be adjusted to the maximum opening degree and controls the cold air door to be adjusted to the minimum opening degree; and setting the adjusting upper limit temperature T4, wherein T2 is more than T4, and when T4 is more than or equal to T0, the control part controls the cold air door to be adjusted to the maximum opening and controls the hot air door to be adjusted to the minimum opening.
Further preferably, when T3 is less than or equal to T0 and less than T1, the control part controls the coal grinding speed of the coal grinding machine to be QD = Nt/h-2T/h.
Further preferably, when T2 is less than or equal to T0 and less than T4, the control part controls the coal grinding speed of the coal grinding machine to be QD = Nt/h + 2T/h.
Further preferably, a lower limit warning temperature T5 is set, T5 < T3, and when T0 < T5, an alarm is triggered and the cold air door is manually closed.
Still more preferably, when T5 ≦ T0 < T3, the control part controls the coal grinding speed of the coal grinding machine to QD = Nt/h-3T/h.
Still further preferably, when T0 < T5, the control part controls the coal grinding speed of the coal grinding machine to be QD = Nt/h-4T/h.
Further preferably, an upper limit warning temperature T6 is set, T4 < T6, and when T6 ≦ T0, an alarm is triggered and the hot damper is manually closed.
Still more preferably, when T4 ≦ T0 < T6, the control part controls the coal grinding speed of the coal grinding machine to QD = Nt/h + 3T/h.
Still more preferably, when T6 ≦ T0, the control unit controls the coal grinding speed of the coal mill to QD = Nt/h + 4T/h.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the temperature measuring component detects a temperature value and transmits the temperature value to the controller through an instruction TE-T0, the controller controls the opening sizes of the cold air door and the hot air door and the actual coal grinding speed of the coal mill according to a preset program method to adjust the temperature at the outlet of the coal mill, and when the cold air door and the hot air door do not act according to the instruction of the control component or the temperature cannot be automatically adjusted, the cold air door or the hot air door is forcibly closed through manual control, so that the problem that the coal mill outlet temperature is too high, the spontaneous combustion phenomenon of a coal pulverizing system can be caused, and the safety accident caused by coal powder explosion can be solved; or the temperature at the outlet of the coal mill is too low, the coal cannot be dried sufficiently, so that the problems of difficult pulverization, poor coal powder fluidity, influence on coal powder conveying and even powder accumulation and blockage are caused; meanwhile, the method for coordinately adjusting the opening degree of the cold and hot air door and the coal grinding speed of the coal mill is combined, so that the real-time and full-process automatic control of the outlet temperature of the coal mill is realized.
Drawings
FIG. 1 is a schematic structural diagram of a control relationship of a coal mill in this embodiment;
FIG. 2 is a flow chart of opening control of the cold air door and the hot air door in the present embodiment;
FIG. 3 is a flow chart of the control of the coal grinding speed of the coal mill in this embodiment.
In the above drawings: 1. a coal mill; 11. an inlet; 12. an outlet; 13. a coal grinding assembly; 14. a cold air door; 15. a hot air door; 2. a coal feeder; 3. a control component; 4. a ventilation duct; 5. a temperature measuring part; 6. and (5) manually regulating and controlling the valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a method for controlling the temperature of an outlet 12 of a coal mill 1, the coal mill 1 having an inlet 11 of the coal mill 1 for receiving coal blocks, an outlet 12 of the coal mill 1 for delivering coal powder, and a coal grinding assembly 13 for actually grinding coal, the inlet 11 of the coal mill 1 being provided with a cold air door 14 for controlling the amount of cold air introduced into the coal mill 1, and a hot air door 15 for controlling the amount of hot air introduced into the coal mill 1, the cold air door 14 and the hot air door 15 delivering primary air into the inlet 11 of the coal mill 1 through a ventilation duct 4, and a coal feeder 2 for supplying coal blocks from the inlet 11 of the coal mill 1 to the coal mill 1 being provided, the method comprising: the coal mill 1 is provided with a control part 3, a temperature measuring part 5 and a manual regulating and controlling valve 6, the control part 3 is used for automatically controlling the opening degree of a cold air door 14, the opening degree of a hot air door 15 and the coal grinding speed of the coal mill 1, the temperature measuring part 5 is arranged at an outlet 12 of the coal mill 1 and is connected with the control part 3, the temperature measuring part 5 is used for measuring the actual outlet temperature T0 of the coal mill 1 and feeding back the actual outlet temperature T0 to the control part 3, and the manual regulating and controlling valve 6 is used for manually and forcibly closing the cold air door 14 or the hot air door 15 when the cold air door 14 and the hot air door 15 do not act according to the instruction of the control part 3 or the temperature of the cold air door 15 cannot be regulated and controlled. The coal mill 1 is also provided with an alarm part, which is started to give an alarm when the temperature of the outlet 12 of the coal mill 1 exceeds a specified warning temperature range, and in the embodiment, the alarm part is an indicator lamp on the control part 3.
According to the type of coal ground by the coal grinding mill 1, an operator sets a lower outlet temperature limit T1 for safe operation of the coal grinding mill 1, sets an upper outlet temperature limit T2 for safe operation of the coal grinding mill 1, sets an adjustment lower limit temperature T3, sets an adjustment upper limit temperature T4, sets a lower limit warning temperature T5, sets an upper limit warning temperature T6, T5 < T3 < T1 < T2 < T4 < T6, the temperature measuring component 5 detects a temperature value and transmits the temperature value to the control component 3 through an instruction TE-T0, and the control component 3 compares the T0 with preset T1, T2, T3, T4, T5 and T6. When T0 is higher than T2, spontaneous combustion of a coal pulverizing system may occur, and coal dust explosion may cause safety accidents, when T0 is lower than T1, coal cannot be sufficiently dried, so that coal pulverizing is difficult, coal dust mobility is poor, coal dust conveying is affected, and even powder accumulation and blockage are caused, the opening degrees of the cold air door 14 and the hot air door 15 need to be adjusted through the control part 3 or the manual control valve 6, the actual coal pulverizing speed of the coal pulverizing assembly 13 of the coal pulverizer 1 is controlled by combining the control part 3, the temperature of the actual outlet 12 of the coal pulverizer 1 is controlled to be finally stabilized within the range of T1 being not more than T0 being less than T2 by being matched with each other, and safe and stable operation of the coal pulverizer 1 is ensured.
The specific control method for the opening degrees of the cold air door 14 and the hot air door 15 comprises the following steps:
as shown in fig. 2, when T0 < T5, the control unit 3 controls the hot air door 15 to be adjusted to the maximum opening degree, triggers an alarm, and manually controls the manual control valve 6 to close the cold air door 14 by an operator; when T5 is not less than T0 and is less than T3, the control component 3 controls the hot air door 15 to be adjusted to the maximum opening degree and controls the cold air door 14 to be adjusted to the minimum opening degree; when T3 is more than or equal to T0 and less than T1, the control component 3 controls the opening degree of the hot air door 15 to be properly increased and the opening degree of the cold air door 14 to be properly decreased according to the actual temperature; when T0 is more than or equal to T1 and less than T2, the control part 3 controls the cold air door 14 and the hot air door 15 to have no action and keep stable; when T2 is more than or equal to T0 and less than T4, the control component 3 controls the opening degree of the cold air door 14 to be properly increased and the opening degree of the hot air door 15 to be properly decreased according to the actual temperature; when T4 is not less than T0 and is less than T6, the control component 3 controls the cold air door 14 to be adjusted to the maximum opening degree and controls the hot air door 15 to be adjusted to the minimum opening degree; when T6 is less than or equal to T0, the control part 3 controls the cold air door 14 to be adjusted to the maximum opening degree, an alarm is triggered, and an operator manually controls the manual control valve 6 to close the hot air door 15.
The concrete control method for the actual coal grinding speed of the coal grinding machine 1 comprises the following steps:
as shown in fig. 3, the initial coal feeding amount QD of the coal mill 1, the actual coal grinding speed of the coal grinding assembly 13 of the coal mill 1 are set to N, and the initial coal feeding amount QD = Nt/h, and when T0 < T5, the control part 3 controls the coal grinding speed of the coal mill 1 to QD = Nt/h-4T/h; when T0 is more than or equal to T5 and less than T3, the control component 3 controls the coal grinding speed of the coal grinding machine 1 to be QD = Nt/h-3T/h; when T0 is more than or equal to T3 and less than T1, the control component 3 controls the coal grinding speed of the coal grinding machine 1 to be QD = Nt/h-2T/h; when T1 is not less than T0 and T2, the control component 3 controls the coal grinding speed of the coal grinder 1 to be QD = Nt/h; when T0 is more than or equal to T2 and less than T4, the control component 3 controls the coal grinding speed of the coal grinder 1 to be QD = Nt/h + 2T/h; when T0 is more than or equal to T4 and less than T6, the control component 3 controls the coal grinding speed of the coal grinding machine 1 to be QD = Nt/h + 3T/h; when T6 is not more than T0, the control unit 3 controls the coal grinding speed of the coal mill 1 to be QD = Nt/h + 4T/h.
The following describes a practical application of the present embodiment:
application of the control method of the present embodiment to the coal mill 1 of the 300MW unit four-corner tangential firing boiler, the lower temperature limit T1=75 ℃ of the outlet 12 is set, the upper temperature limit T2=85 ℃ of the outlet 12 for safe operation of the coal mill 1 is set, the lower regulation limit temperature T3=70 ℃ is set, the upper regulation limit temperature T4=90 ℃ is set, the lower limit warning temperature T5=65 ℃ is set, the upper limit warning temperature T6=95 ℃ is set, the initial coal supply QD =8T/h, and the temperature measuring unit 5 transmits the detected temperature value to the control unit 3 in order of TE-T0.
When T0 is less than T5, the control part 3 controls the hot air door 15 to be adjusted to the maximum opening degree, an alarm is triggered, the operator manually controls the manual control valve 6 to close the cold air door 14, and the control part 3 controls the coal grinding speed of the coal mill 1 to be N = 12; when T5 is not less than T0 and is more than T3, the control component 3 controls the hot air door 15 to be adjusted to the maximum opening degree and controls the cold air door 14 to be adjusted to the minimum opening degree, and the control component 3 controls the coal grinding speed of the coal mill 1 to be N = 11; when T3 is not less than T0 and T1, the control component 3 controls the opening degree of the hot air door 15 to be properly increased and the opening degree of the cold air door 14 to be properly decreased according to the actual temperature, and the control component 3 controls the coal grinding speed of the coal grinding machine 1 to be N = 10; when T0 is more than or equal to T1 and less than T2, the control component 3 controls the cold air door 14 and the hot air door 15 to have no action and keep stable, and the control component 3 controls the coal grinding speed of the coal mill 1 to be N = 8; when T2 is not less than T0 and T4, the control component 3 controls the opening degree of the cold air door 14 to be properly increased and the opening degree of the hot air door 15 to be properly decreased, and the control component 3 controls the coal grinding speed of the coal mill 1 to be N = 6; when T4 is not less than T0 and is more than T6, the control component 3 controls the cold air door 14 to be adjusted to the maximum opening degree and controls the hot air door 15 to be adjusted to the minimum opening degree, and the control component 3 controls the coal grinding speed of the coal mill 1 to be N = 5; when T6 is less than or equal to T0, the control part 3 controls the cold air door 14 to be adjusted to the maximum opening degree, an alarm is triggered, the manual control valve 6 is manually controlled by an operator to close the hot air door 15, and the control part 3 controls the coal grinding speed of the coal grinding machine 1 to be N = 4.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a coal pulverizer export temperature control method, coal pulverizer entrance be provided with the control to the coal pulverizer in let in the cold air door of cold wind size, the control to the coal pulverizer in let in the hot-blast air door of size, its characterized in that: the method comprises the following steps:
the coal mill is provided with a control part and a temperature measuring part, the control part is used for controlling the opening degree of a cold air door, the opening degree of a hot air door and the coal milling speed of the coal mill, the temperature measuring part is arranged at the outlet of the coal mill and connected with the control part, and the temperature measuring part is used for measuring the actual outlet temperature T0 of the coal mill and feeding back the actual outlet temperature T0 to the control part;
according to the type of coal ground by the coal mill, setting a lower outlet temperature limit T1 for safe operation of the coal mill and an upper outlet temperature limit T2 for safe operation of the coal mill, wherein T1 is more than T2, the control part controls the actual outlet temperature of the coal mill to be T1 or less than T0 or less than T2 by adjusting the opening degree of a cold air door and a hot air door, and when T0 is more than T1, the control part controls to increase the opening degree of a hot air door, reduce the opening degree of the cold air door or manually close the cold air door; when T2 is not more than T0, the control part controls the opening of the cold air door to be increased, the opening of the hot air door to be decreased or the hot air door to be manually closed;
setting the initial coal feeding quantity QD of the coal mill, the actual coal grinding speed of the coal mill as N, setting the actual outlet temperature of the coal mill to be T0 which is more than or equal to T1 and less than T2, setting QD = Nt/h, and when T0 is more than T1, increasing the actual coal grinding speed by the control part; when T2 is less than or equal to T0, the control part reduces the actual coal grinding speed.
2. The coal mill outlet temperature control method of claim 1, characterized in that: setting a regulation lower limit temperature T3, wherein T3 is less than T1, and when T0 is less than T3, the control part controls the hot air door to be regulated to the maximum opening degree and controls the cold air door to be regulated to the minimum opening degree; and setting the adjusting upper limit temperature T4, wherein T2 is more than T4, and when T4 is more than or equal to T0, the control part controls the cold air door to be adjusted to the maximum opening and controls the hot air door to be adjusted to the minimum opening.
3. The coal mill outlet temperature control method of claim 2, characterized in that: when T3 is not less than T0 and is less than T1, the control part controls the coal grinding speed of the coal grinder to be QD = Nt/h-2T/h.
4. The coal mill outlet temperature control method of claim 2, characterized in that: when T2 is not less than T0 and is less than T4, the control part controls the coal grinding speed of the coal grinder to be QD = Nt/h + 2T/h.
5. The coal mill outlet temperature control method of claim 2, characterized in that: the lower limit warning temperature T5 is set, T5 < T3, and when T0 < T5, an alarm is triggered and the cold air door is manually closed.
6. The coal mill outlet temperature control method of claim 5, characterized in that: when T5 is not less than T0 and is less than T3, the control part controls the coal grinding speed of the coal grinder to be QD = Nt/h-3T/h.
7. The coal mill outlet temperature control method of claim 5, characterized in that: when T0 < T5, the control part controls the coal grinding speed of the coal grinding machine to be QD = Nt/h-4T/h.
8. The coal mill outlet temperature control method of claim 2, characterized in that: and setting an upper limit warning temperature T6, setting T4 < T6, triggering an alarm when T6 is less than or equal to T0, and manually closing the hot air door.
9. The coal mill outlet temperature control method of claim 8, characterized in that: when T4 is not less than T0 and is less than T6, the control part controls the coal grinding speed of the coal grinder to be QD = Nt/h + 3T/h.
10. The coal mill outlet temperature control method of claim 8, characterized in that: when T6 is less than or equal to T0, the control part controls the coal grinding speed of the coal grinding machine to be QD = Nt/h + 4T/h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301391A (en) * | 2022-08-04 | 2022-11-08 | 中国能源建设集团西北电力试验研究院有限公司 | Intelligent control shutdown method for direct-fired pulverizing system |
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