CN114632614A - Automatic control system and method for warm grinding of coal mill - Google Patents
Automatic control system and method for warm grinding of coal mill Download PDFInfo
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- CN114632614A CN114632614A CN202210248287.4A CN202210248287A CN114632614A CN 114632614 A CN114632614 A CN 114632614A CN 202210248287 A CN202210248287 A CN 202210248287A CN 114632614 A CN114632614 A CN 114632614A
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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
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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
- 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
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Abstract
The invention discloses a coal mill warm grinding automatic control system and a method, wherein the system comprises a hot primary air electric valve, a cold primary air electric valve, a coal mill inlet air temperature measuring point and a primary air flow measuring point which are arranged at an inlet of a coal mill, and a coal mill outlet air temperature measuring point which is arranged at an outlet of the coal mill; the method comprises the following steps: (1) setting a primary air quantity set value of the coal mill according to the type or the operation rule of the coal mill; (2) setting a coal mill outlet air temperature set value; (3) setting a warm grinding rate set value according to the load condition of the unit and the warm grinding time; (4) and starting the automatic warm mill, and automatically controlling the hot primary air electric valve and the cold primary air electric valve. In the warm grinding stage, a warm grinding rate set value is given according to the load change rate of the unit, and the air temperature at the outlet of the coal mill rises at a constant speed from the initial state at the rate until warm grinding is finished.
Description
Technical Field
The invention belongs to the field related to automatic control of a thermal power plant, and particularly relates to a warm grinding automatic control system and method for a coal mill.
Background
Under the background of deep peak regulation, a coal mill of a thermal power generating unit faces frequent start-stop operation, automatic control of the coal mill is realized, the labor intensity of operators can be effectively reduced, and the automation degree of thermal power is improved. The warm mill is an important link in the starting process of the coal mill, and under a reasonable warm milling speed, all parts in the coal mill are guaranteed to be uniformly heated before the coal is distributed to the coal mill, so that the warm mill is a key for starting the coal mill by one key. At present, the conventional warm mill automatic control system and method have some problems:
1. the warm grinding rate can not be adjusted according to the load change condition of the unit
When the load of the unit rises rapidly and a certain grinding unit needs to be started, the slow warm grinding speed can cause the starting time to be too long, and further the peak regulation capacity of the unit is limited. On the contrary, if the hot primary air electric valve is opened as much as possible, the coal mill is heated at the fastest heating and grinding speed, although the air temperature at the outlet of the coal mill can reach the regulation of the operation regulation as soon as possible to complete heating and grinding, the interior of the mill group is heated unevenly, large thermal stress exists, and the coal mill is not favorable for healthy operation.
2. Frequent intervention of operating personnel is required in the warm grinding process
The conventional warm mill logic adopts a PID control mode, and operators need to continuously adjust and improve the set value of the outlet air temperature of the coal mill according to the actual state of the mill group, so that the outlet air temperature specified by regulations is finally reached. In addition, because warm mill its initial temperature of every turn and not necessarily be in the cold attitude completely, whole warm mill process will be more complicated, and the operating personnel generally can amputate automatic control, and wind electric valve and cold wind electric valve aperture once are controlled according to the operation experience to warm mill and put into automatic control again after accomplishing. Frequent intervention in the warm grinding process increases the labor intensity of operators on one hand, and limits the development of thermal power to an intelligent direction on the other hand.
Disclosure of Invention
In view of the problems in the prior art, it is an object of the present invention to provide an automatic control system and method for warm-grinding of a coal mill, in which a warm-grinding rate setting value is given according to a load change rate of a unit, and the temperature of coal mill outlet air is raised at a constant speed from an initial state until warm-grinding is completed.
The invention is realized by adopting the following technical scheme:
an automatic control system for warm grinding of a coal mill comprises a hot primary air electric valve, a cold primary air electric valve, a coal mill inlet air temperature measuring point and a primary air flow measuring point which are arranged at an inlet of the coal mill, and a coal mill outlet air temperature measuring point which is arranged at an outlet of the coal mill;
when the coal mill is used for warm grinding, warm air with set mass flow and temperature is formed in a proportioning mode by controlling the opening degree of the hot primary air electric valve and the opening degree of the cold primary air electric valve, the warm air enters the coal mill for warm grinding, when the air temperature at the outlet of the coal mill is heated from the initial temperature to the preset temperature, the primary air volume at the inlet is stabilized at the preset value, and after the set time is maintained, warm grinding is completed; when the automatic warm mill is started, a primary air flow measuring point signal is sent to the hot primary air electric valve for feedback control, and a coal mill outlet air temperature measuring point signal is sent to the cold primary air electric valve for feedback control.
The invention is further improved in that the warm grinding control logic also comprises a PID controller and a temperature rate module;
the temperature rate module is used for deriving the temperature value measured by the coal mill outlet air temperature measuring point with time to obtain the temperature rise rate, comparing the current temperature rise rate with the set temperature rise rate, and then sending a signal to the PID controller for controlling the opening of the primary cold air electric valve.
The invention further improves that the device also comprises a controller selection switch;
the controller selection switch is used for switching the PID controller of the opening control loop of the cold primary wind power valve in the warm grinding process, when the wind temperature at the outlet of the coal mill is smaller than a set value, the opening of the cold primary wind power valve is controlled by a warm grinding rate set value, when the wind temperature approaches the set value of the wind temperature at the outlet of the coal mill, the controller selection switch is switched, the opening of the cold primary wind power valve is controlled by the set value of the wind temperature at the outlet of the coal mill, and then the wind temperature is maintained at the set value until an operator readjusts the set value after the mill is started.
The invention has the further improvement that the invention also comprises a speed limit module;
the speed limiting module is used for limiting the rising rate of the primary air quantity, and rising the set value of the primary air quantity to a given set value from zero under the limited rate, so that the condition that the opening of the electric valve of the primary hot air is maximum after a warm grinding signal is received is prevented, and combustion disturbance of the boiler is caused.
A coal mill warm grinding automatic control method is based on the coal mill warm grinding automatic control system and comprises the following steps:
(1) setting a primary air quantity set value of the coal mill according to the type or the operation rule of the coal mill;
(2) setting a coal mill outlet air temperature set value;
(3) setting a warm grinding rate set value according to the unit load condition and warm grinding time;
(4) and starting the automatic warm mill, and automatically controlling the hot primary air electric valve and the cold primary air electric valve.
The further improvement of the invention is that the warm grinding speed is 2-6 ℃/min.
A further improvement of the invention is that the controller selects the switch parameter setting strategy as follows:
the switching condition of the selector switch of the controller is set to be 1-2 ℃ lower than the set value of the air temperature of the outlet of the coal mill, so that the two paths of PID control are prevented from being frequently switched.
The invention has the further improvement that the strategy for setting the parameters of the air volume speed limiting module is as follows:
the speed limit module parameter is set to be 0.5 t/s-1.5 t/s, when the parameter is too small, the inlet primary air volume is slowly increased, when the interior of the coal mill is unevenly heated in the warm grinding initial stage, and when the parameter is too large, the inlet primary air volume is suddenly increased, so that the combustion fluctuation of the boiler is caused.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the invention provides a coal mill warm grinding automatic control system, which is characterized in that a temperature rate module, a controller selection switch and a speed limit module are added in warm grinding control logic, and mature modules are arranged in DCS control systems of various thermal power generating units; compared with the prior art, the coal mill warm grinding automatic control system does not need to increase hardware facilities, and only needs to modify logic configuration in a DCS system.
Compared with the prior art, the automatic control method for warm grinding of the coal mill, provided by the invention, only needs the operator to provide the set value of the primary air quantity of the coal mill, the set value of the air temperature at the outlet of the coal mill and the set value of the warm grinding rate, is simple, and can realize the following effects:
1. the warm mill speed can be adjusted according to the unit load condition, the warm mill temperature rise rate can be controlled to be uniform in the warm mill process, and the conditions that the short-time temperature rise rate is too high and the local thermal stress of the coal mill is large in the warm mill process are avoided.
2. After the warm grinding process is finished, the warm grinding control system can automatically switch, and maintain the air temperature and the air quantity of the coal mill at set values until the coal mill receives a grinding starting signal or a blowing stopping signal.
3. The warm mill automatic control system can control the primary air quantity at the mill outlet to slowly rise from zero to a set value, and avoids the interference of the cold and hot primary air electric valves on the boiler combustion caused by the fact that the electric valves are opened to the maximum at the beginning of warm mill.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention. Wherein, 1 is a hot primary air electric valve, 2 is a cold primary air electric valve, 3 is a coal mill inlet air temperature measuring point, 4 is a primary air flow measuring point, 5 is a coal mill, and 6 is a coal mill outlet air temperature measuring point.
FIG. 2 is a schematic diagram of an automatic warm mill control logic, compared with a conventional warm mill control logic, an air quantity speed limiting module, a temperature rate module, a controller selection switch and a PID automatic control loop adopting a temperature rise rate to control warm mill are added.
FIG. 3 is a schematic diagram of a simulation module of the automatic warm grinding control system.
FIG. 4 is a coal mill outlet air temperature curve of a simulated automatic warm grinding process.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in figure 1, the automatic control system for warm grinding of the coal mill provided by the invention comprises a hot primary air electric valve 1, a cold primary air electric valve 2, a coal mill inlet air temperature measuring point 3 and a primary air flow measuring point 4 which are arranged at an inlet of the coal mill 5, and a coal mill outlet air temperature measuring point 6 which is arranged at an outlet of the coal mill 5.
The coal mill warm grinding is that warm air with set mass flow and temperature is formed in a proportioning mode by controlling the opening degree of the hot primary air electric valve 1 and the opening degree of the cold primary air electric valve 2 and enters the coal mill 5 for warm grinding. In the thermal power operation rule, when the temperature of the coal mill outlet air 6 is heated to about 70 ℃ from the initial temperature, the primary air flow 4 is stabilized at about 90t/h, and the operation is carried out for 2 and 3 minutes by maintaining the two data, the warm grinding is regarded as being completed. When the control system starts the automatic warm mill, the strategy of controlling the flow rate by the hot air valve and the temperature by the cold air valve is adopted, the signal of the primary air flow measuring point 4 is sent to the hot air valve for feedback control, and the signal of the coal mill outlet air temperature measuring point 6 is sent to the cold air valve for feedback control.
An automatic control system and method for warm grinding of a coal mill is disclosed, which is an automatic warm grinding control logic diagram shown in fig. 2, and has the functions of warm grinding of primary air volume 4 at an inlet of the coal mill from an initial state without air volume to a set value of the primary air volume, and raising air temperature 6 at an outlet of the coal mill from the initial temperature to a set value of the air temperature at the outlet of the coal mill.
The automatic control system for warm grinding of the coal mill is additionally provided with a PID controller, a temperature rate module is additionally arranged in a feedback loop of an air temperature 6 at an outlet of the coal mill, a current temperature rise rate is compared with a set value of the warm grinding rate, and then a signal is sent to the PID controller to control the opening of the cold air door valve. And when the rising rate of the air temperature at the outlet of the coal mill is greater than a set value, opening the large cooling air door, otherwise, closing the small cooling air door, thereby controlling the warm milling rate in the warm milling process.
According to the automatic control system and the method for warm grinding of the coal mill, a controller selection switch is added in an automatic warm grinding control logic. And when the coal mill outlet air temperature 6 is less than the coal mill outlet air temperature set value, the opening of the cold primary wind electric valve 2 is controlled by a warm grinding rate set value. When the coal mill outlet air temperature 6 is close to a coal mill outlet air temperature set value, the controller selection switch is switched, the opening degree of the cold primary wind electric valve 2 is controlled by the coal mill outlet air temperature set value, then the air temperature is maintained at the set value, and the set value is adjusted again by an operator after the coal mill is started.
According to the automatic control system and method for the coal mill warm grinding, a speed limit module is added behind a primary air flow set value in an automatic warm grinding control logic. The device is used for limiting the primary air flow 4 to rise to a set value in a short time after a warm grinding signal is sent out, so that the combustion of a boiler is unstable and large thermal stress is generated on a coal mill. After the speed limiting module is added, the set value of the primary air quantity is increased to the set value from zero at a limited speed, and the situation that the opening of the hot primary air electric valve 1 is opened to the maximum after a warm grinding signal is received is prevented.
A simulation model is established to test the warm mill automatic control system and the warm mill automatic control method, as shown in fig. 3, hot primary air enters the coal mill for warm milling, and the influence of the hot primary air on the outlet air temperature of the coal mill is positively correlated, so that the gain coefficient of the hot air in the coal mill temperature model is positive. On the contrary, the cold primary air slows down the increase of the air temperature at the outlet of the coal mill, and the gain coefficient is negative. In the coal mill flow model, the primary air flow of the coal mill is increased by increasing the opening of the electric valve regardless of the hot primary air and the cold primary air, so that the gain coefficient in the flow model is positive. The coal mill temperature and flow models are inertia links, wherein the inertia time constant of the coal mill temperature model is large.
As shown in FIG. 3, according to the steps of the automatic warm grinding method, the set value of the primary air volume of the coal mill is set to be 90t/h, the set value of the outlet air temperature of the coal mill is set to be 70 ℃, and the set value of the warm grinding rate is set to be 6 ℃/min; the switching condition of the selector switch of the controller is set to be 69 ℃, the switching condition is 1 ℃ lower than the set value of the air temperature of the outlet of the coal mill, and the parameter of the speed limiting module is set to be 1 t/s.
After the automatic warm grinding instruction is sent, the coal mill outlet air temperature 6 rises to 69 ℃ at a constant speed according to a warm grinding rate set value, at the moment, the controller selects a switch to switch, the PID2 controls the coal mill outlet air temperature 6 instead, the primary air flow 4 and the coal mill outlet air temperature 6 are maintained at set values, and warm grinding is completed.
FIG. 4 is a coal mill outlet air temperature curve of a simulated automatic warm grinding process. It can be seen that after the warm grinding instruction is sent, the set value of the air temperature at the outlet of the coal mill is stepped from the initial 30 ℃ to 70 ℃, and the measured value of the air temperature at the outlet of the coal mill is increased to 70 ℃ at a set rate and is kept unchanged. In the initial stage of warm grinding, the hot primary air electric valve 1 and the cold primary air electric valve 2 are both opened in a closed state, so that the initial temperature rise rate is high, and the temperature rise rate is controllable after primary air flow control is stable.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The automatic control system for the warm grinding of the coal mill is characterized by comprising a hot primary air electric valve (1), a cold primary air electric valve (2), a coal mill inlet air temperature measuring point (3) and a primary air flow measuring point (4) which are arranged at an inlet of the coal mill (5), and a coal mill outlet air temperature measuring point (6) which is arranged at an outlet of the coal mill (5);
when the coal mill is warm-milled, warm air with set mass flow and temperature is formed in a proportioning mode by controlling the opening degree of the hot primary air electric valve (1) and the opening degree of the cold primary air electric valve (2) and enters the coal mill (5) for warm milling, when the air temperature at the outlet of the coal mill is warm from the initial temperature to the preset temperature, the primary air volume at the inlet is stabilized at the preset value, and after the set time is maintained, warm milling is completed; when the automatic warm grinding is started, a primary air flow measuring point (4) signal is sent to the hot primary air electric valve (1) for feedback control, and a coal mill outlet air temperature measuring point (6) signal is sent to the cold primary air electric valve (2) for feedback control.
2. The coal mill warm mill automatic control system of claim 1, characterized in that the warm mill control logic further comprises a PID controller and a temperature rate module;
the temperature rate module is used for deriving the temperature value measured by the coal mill outlet air temperature measuring point (6) with time to obtain the temperature rise rate, comparing the current temperature rise rate with the set temperature rise rate, and then sending a signal to the PID controller for controlling the opening of the cold primary air electric valve (2).
3. The automatic control system for warm grinding of the coal grinding mill as claimed in claim 1, further comprising a controller selection switch;
the controller selection switch is used for switching an opening control loop PID controller of the primary cold wind electric valve (2) in a warm grinding process, when the temperature of wind at the outlet of the coal mill is smaller than a set value, the opening of the primary cold wind electric valve (2) is controlled by a warm grinding rate set value, when the temperature of the wind approaches the set value of the temperature of the wind at the outlet of the coal mill, the controller selection switch is switched, the opening of the primary cold wind electric valve (2) is controlled by the set value of the temperature of the wind at the outlet of the coal mill, then the temperature of the wind is maintained at the set value, and the set value is readjusted by an operator until the mill is started.
4. The automatic control system for warm grinding of the coal mill as claimed in claim 1, further comprising a speed limiting module;
the speed limiting module is used for limiting the rising rate of the primary air quantity, rising the set value of the primary air quantity to a given set value from zero under the limited rate, and preventing the opening of the primary hot air electric valve (1) from being opened to the maximum after receiving a warm grinding signal to cause combustion disturbance of the boiler.
5. An automatic control method for warm grinding of a coal mill, which is based on the automatic control system for warm grinding of a coal mill as claimed in any one of claims 1 to 4, and comprises the following steps:
(1) setting a primary air quantity set value of the coal mill according to the type or the operation rule of the coal mill;
(2) setting a coal mill outlet air temperature set value;
(3) setting a warm grinding rate set value according to the load condition of the unit and the warm grinding time;
(4) and starting the automatic warm mill, and automatically controlling the hot primary air electric valve (1) and the cold primary air electric valve (2).
6. The automatic control method for the warm grinding of the coal mill as claimed in claim 5, wherein the warm grinding speed is 2 ℃/min to 6 ℃/min.
7. The automatic control method for warm grinding of the coal mill as claimed in claim 5, wherein the controller selects the switch parameter setting strategy as follows:
the switching condition of the selector switch of the controller is set to be 1-2 ℃ lower than the set value of the air temperature of the outlet of the coal mill, so that the two paths of PID control are prevented from being frequently switched.
8. The automatic control method for warm grinding of the coal mill as claimed in claim 5, wherein the setting strategy of the parameters of the air volume speed limiting module is as follows:
the speed limit module parameter is set to be 0.5 t/s-1.5 t/s, when the parameter is too small, the inlet primary air volume is slowly increased, when the interior of the coal mill is unevenly heated in the warm grinding initial stage, and when the parameter is too large, the inlet primary air volume is suddenly increased, so that the combustion fluctuation of the boiler is caused.
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Cited By (1)
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| CN115445753A (en) * | 2022-09-13 | 2022-12-09 | 杭州意能电力技术有限公司 | One-key automatic warm grinding control method for coal-fired unit |
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