CN113262869B - Coal mill coal type switching device and judging method based on coal crushing characteristics - Google Patents
Coal mill coal type switching device and judging method based on coal crushing characteristics Download PDFInfo
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- CN113262869B CN113262869B CN202110498314.9A CN202110498314A CN113262869B CN 113262869 B CN113262869 B CN 113262869B CN 202110498314 A CN202110498314 A CN 202110498314A CN 113262869 B CN113262869 B CN 113262869B
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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
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
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Abstract
A coal mill coal type switching device and a judging method based on coal crushing characteristics comprise a power meter positioned on a matched motor of a coal mill, wherein a coal feeding flowmeter is arranged at a position where the side surface of the coal mill is connected with a coal bin. According to the invention, the real-time acquisition and processing system of relevant measuring points and data is additionally arranged on the coal mill equipment, the unit consumption of the coal mill reflecting the crushing characteristics of coal quality in the coal mill is calculated in real time, and the specific coal type switching time of the new coal of the coal mill after entering the coal mill is judged through the average unit consumption of the coal mill and the change rate change of the average unit consumption of the coal mill.
Description
Technical Field
The invention relates to the technical field of thermal power generation in the energy power industry, in particular to a coal mill coal type switching device and a judging method based on coal crushing characteristics.
Background
Before coal in the coal-fired unit is combusted, the coal is required to enter the coal mill for crushing and then enter the hearth for combustion, when different coals enter the coal mill for crushing, the operation of the coal mill is required to be adjusted in the aspects of safety and economy, and the granularity of pulverized coal crushed by the coal and the temperature of air conveying pulverized coal are controlled to ensure the safe and economical operation of the coal mill.
The traditional method generally judges the concrete time of new coal entering the coal bunker according to the coal charging time of the boiler coal charging system, and operators judge the approximate time of new coal entering the coal mill from the coal bunker according to experience, and then the operation requirements of the coal mill are adjusted, such as adjusting the separation baffle of the coal mill, the temperature of air conveying coal dust and the like. Therefore, the new coal type can be started to be correspondingly operated and adjusted after entering the coal mill for a long time, and the specific time for coal type switching of the coal mill can not be timely judged, so that the safety (such as deflagration of the coal mill, combustion of a powder tube after the outlet of the coal mill and the like) and the economical efficiency (such as increase of electricity consumption, increase of fly ash combustibles and the like) of the coal mill are reduced.
Disclosure of Invention
The invention aims to provide a coal type switching device and a judging method for a coal mill based on coal crushing characteristics, aiming at solving the problem that the switching time of the coal type of a new coal entering the coal mill cannot be accurately and timely judged.
In order to achieve the above purpose, the technical scheme adopted by the invention and the beneficial effects of the invention are as follows:
the coal type switching device of the coal mill based on the coal crushing characteristic comprises a motor power meter 2 arranged on a matched motor of the coal mill, and a coal feeding flowmeter 1 arranged at a position where the side surface of the coal mill is connected with a coal bin; the coal supply flowmeter 1 and the power meter 2 transmit the obtained information to the data acquisition and processing system 3.
The coal feeding flowmeter 1 is used for counting the flow of the coal bunker into the coal mill.
The motor power meter 2 is used for calculating the power inside the coal mill.
The coal feeding flowmeter 1 is arranged at the outlet of the coal feeder.
The power meter 2 is arranged on a matched motor of the coal mill.
A discriminating method of a coal mill coal type switching device based on coal crushing characteristics comprises the following steps of;
step 1:
installing measuring points on the coal feeding flowmeter 1 and the power meter 2, and collecting relevant real-time data;
step 2:
according to the collected real-time data, calculating the unit consumption e of the coal mill at any moment coal (t)；
Step 3:
calculating unit consumption e of coal mill coal A moving average e of (t) coal,pj,tx ，t 0 Taking 10-30s;
step 4:
calculating the average unit consumption change rate epsilon of the coal mill coal,pj,tx Dt can take 1-5s;
step 5:
when e coal,pj,tx Sum of absolute value changes of epsilon coal,pj,tx Respectively greater than a certain set threshold value, and then e coal,pj,tx Tend to stabilize and ε coal,pj,tx If the coal is 0, determining that the new coal enters the coal grinding machine at the momentThe machine completes the coal variety switching in the coal mill.
The unit consumption e of the coal mill in the second step coal The calculation formula of (t) is:
in the formula e coal -coal mill unit consumption, kWh/kg;
W mill -motor power, kW;
m coal -coal feed flow into the coal mill, kg/h.
The unit consumption e of the coal mill in the step three coal A moving average e of (t) coal,pj,tx The specific formula is as follows:
in the formula e coal,pj,tx ——t x Average unit consumption of the coal mill at moment, and kWh/kg;
t x -moving average end time, s;
t 0 -a time period of moving average, s;
e coal and (t) -real-time unit consumption of coal mill and kWh/kg.
e coal (t) is according to e coal The formula performs continuous data calculated in real time.
The average unit consumption change rate epsilon of the coal mill in the fourth step coal,pj,tx The method comprises the following steps:
wherein ε coal,pj,tx -average unit consumption change rate of coal mill, kW/kg;
dt—a period of time before tx time, s;
when at t x After the new coal at moment enters the coal mill, the coal is groundThe coal quality in the coal mill changes, and the average unit consumption e of the coal mill coal,pj,tx The average unit consumption change rate epsilon of the coal mill is correspondingly changed coal,pj,tx The corresponding change can also occur, and the average unit consumption e of the coal mill can be realized along with the new coal to completely replace the original coal in the coal mill coal,pj,tx Will also stabilize to a new value, the average unit consumption change rate epsilon of the coal mill coal,pj,tx Will gradually go to zero.
The invention has the beneficial effects that:
according to the invention, the unit consumption of the coal mill reflecting the crushing characteristics of the coal can be calculated in real time through the distributed relevant measurement point data, the data processing is carried out on the unit consumption of the coal mill calculated in real time, and according to the principle that the crushing characteristics of the coal in the coal mill can change correspondingly after the coal quality in the coal mill is switched, the specific switching time of the coal types in the coal mill when the new coal enters the coal mill is judged simply, conveniently and accurately in real time by utilizing the two acquired data, so that the operator can be informed in time, and the relevant operation adjustment is synchronously carried out according to the change of the coal quality in the coal mill, thereby ensuring the safety and economic operation of the coal mill.
Drawings
Fig. 1 is a schematic diagram 1 (medium speed coal mill) of the device.
Fig. 2 is a schematic diagram 2 of the structure of the device (steel ball coal mill).
Fig. 3 is a schematic diagram of a calculation flow.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
A specific deduction process of a coal type switching device and a distinguishing method of a coal mill based on coal crushing characteristics is described as follows.
After entering the coal mill, the coal is crushed by a crushing component of the coal mill driven by a motor, and the electric power is consumed to realize the crushing of the coal.
The electric power consumed by crushing the coal at the unit mass flow rate is the unit consumption of the coal mill, and the calculation formula is as follows:
in the formula e coal -coal mill unit consumption, kWh/kg;
W mill -motor power, kW;
m coal -coal feed flow into the coal mill, kg/h.
Because the coal feeding flow and the motor power acquisition data of the actual coal mill are fluctuated, the unit consumption of the coal mill calculated continuously correspondingly fluctuated, namely, the unit consumption of the coal mill calculated continuously changes with time, the unit consumption data of the coal mill is required to be subjected to stable treatment by adopting a moving average method, and the average unit consumption of the coal mill at any moment is obtained, wherein the specific formula is as follows:
in the formula e coal,pj,tx ——t x Average unit consumption of the coal mill at moment, and kWh/kg;
t x -moving average end time, s;
t 0 -a time period of moving average, s;
e coal and (t) -real-time unit consumption of coal mill and kWh/kg.
e coal (t) is according to e coal The formula performs continuous data calculated in real time.
When new coal enters the coal mill, as the crushing characteristics of different coals are different (such as the average unit consumption of the coal mill can be increased for the coal difficult to grind, the average unit consumption of the coal mill can be reduced for the coal easy to crush), the average unit consumption of the coal mill can also be correspondingly changed, and the average unit consumption change rate of the coal mill is as follows:
wherein ε coal,pj,tx -average unit consumption change rate of coal mill, kW/kg;
dt-a period of time before tx time, s.
Thus, when at t x After the new coal at the moment enters the coal mill, the coal quality in the coal mill changes, and the average unit consumption e of the coal mill coal,pj,tx The average unit consumption change rate epsilon of the coal mill is correspondingly changed coal,pj,tx The corresponding change can also occur, and the average unit consumption e of the coal mill can be realized along with the new coal to completely replace the original coal in the coal mill coal,pj,tx Will also stabilize to a new value, the average unit consumption change rate epsilon of the coal mill coal,pj,tx Will gradually go to zero.
Therefore, the method is easy to be different according to the crushing characteristics of coal quality, and the specific implementation steps of the method are as follows;
step 1:
the measuring points are installed according to fig. 1 or fig. 2, and the collection of relevant real-time data is realized.
Step 2:
according to the collected real-time data, calculating the unit consumption e of the coal mill at any moment coal (t)。
Step 3:
calculating unit consumption e of coal mill coal A moving average e of (t) coal,pj,tx ，t 0 It can be 10-30s.
Step 4:
calculating the average unit consumption change rate epsilon of the coal mill coal,pj,tx Dt can take 1-5s.
Step 5:
when e coal,pj,tx Sum of absolute value changes of epsilon coal,pj,tx Respectively greater than a certain set threshold value, and then e coal,pi,tx Tend to stabilize and ε coal,pj,tx And when the coal pressure is 0, judging that the new coal enters the coal mill at the moment to finish the coal type switching in the coal mill.
A coal mill coal type switching device and a judging method based on coal crushing characteristics are characterized in that the working principle is as follows:
different coals have different crushing characteristics, and the electric quantity consumed by crushing the coal per unit mass is also different. When the coal quality in the coal mill is stable, the unit consumption of the coal mill can be calculated in real time by using the coal feeding flowmeter and the motor power meter, and the average unit consumption of the coal mill and the average unit consumption change rate of the coal mill are obtained. When the new coal is fed into the coal mill, the crushing characteristics of the coal are correspondingly changed, and the unit consumption of the coal mill, the average unit consumption of the coal mill and the average unit consumption change rate of the coal mill calculated in real time are correspondingly changed, so that the new coal can be judged to be fed into the coal mill.
Claims (4)
1. A discriminating method of a coal type switching device of a coal mill based on coal crushing characteristics is characterized by comprising the following steps of;
step 1:
installing measuring points on the coal feeding flowmeter (1) and the power meter (2), and collecting relevant real-time data;
step 2:
according to the collected real-time data, calculating the unit consumption e of the coal mill at any moment coal (t)；
Step 3:
calculating unit consumption e of coal mill coal A moving average e of (t) coal，pj，tx ，t 0 Taking 10-30s;
step 4:
calculating the average unit consumption change rate epsilon of the coal mill coal，pj，tx Dt can take 1-5s;
step 5:
when e coal，pj，tx Sum of absolute value changes of epsilon coal，pj，tx Respectively greater than a certain set threshold value, and then e coal，pj，tx Tend to stabilize and ε coal，pj，tx When the coal pressure is 0, judging that the new coal enters the coal mill at the moment to finish the coal type switching in the coal mill;
the method is realized by the following device, which comprises a motor power meter (2) arranged on a motor matched with the coal mill, and a coal feeding flowmeter (1) arranged at a position where the side surface of the coal mill is connected with a coal bin; the coal feeding flowmeter (1) and the power meter (2) transmit the obtained information to the data acquisition and processing system (3);
the coal feeding flowmeter (1) is used for counting the flow of the coal bunker entering the coal mill;
the motor power meter (2) is used for calculating the power inside the coal mill;
the coal feeding flowmeter (1) is arranged at the outlet of the coal feeder;
the power meter (2) is arranged on a matched motor of the coal mill.
2. The method for judging the coal type switching device of the coal mill based on the coal crushing property of claim 1, wherein the unit consumption e of the coal mill in the second step is as follows coal The calculation formula of (t) is:
in the formula e coal -coal mill unit consumption, kWh/kg;
W mill -motor power, kW;
m coal -coal feed flow into the coal mill, kg/h.
3. The method for judging the coal type switching device of the coal mill based on the coal crushing property of claim 1, wherein the unit consumption e of the coal mill in the third step coal A moving average e of (t) coal，pj，tx The specific formula is as follows:
in the formula e coal，pj，tx ——t x Average unit consumption of the coal mill at moment, and kWh/kg;
t x -moving average end time, s;
t 0 -a time period of moving average, s;
e coal and (t) -real-time unit consumption of coal mill and kWh/kg.
e coal (t) is according to e coal The formula performs continuous data calculated in real time.
4. The method for judging the coal type switching device of the coal mill based on the coal crushing property of claim 1, wherein the average unit consumption change rate epsilon of the coal mill in the fourth step is characterized in that coal，pj，tx The method comprises the following steps:
wherein ε coal，pj，tx -average unit consumption change rate of coal mill, kW/kg;
dt—a period of time before tx time, s;
when at t x After the new coal at the moment enters the coal mill, the coal quality in the coal mill changes, and the average unit consumption e of the coal mill coal，pj，tx The average unit consumption change rate epsilon of the coal mill is correspondingly changed coal，pj，tx The corresponding change can also occur, and the average unit consumption e of the coal mill can be realized along with the new coal to completely replace the original coal in the coal mill coal，pj，tx Will also stabilize to a new value, the average unit consumption change rate epsilon of the coal mill coal，pj，tx Will gradually go to zero.
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| JPH08252476A (en) * | 1995-03-16 | 1996-10-01 | Ishikawajima Harima Heavy Ind Co Ltd | Mill coal delivery characteristic correction device |
| JP4993560B2 (en) * | 2006-05-24 | 2012-08-08 | 中国電力株式会社 | Coal type switching method and system for coal fired boiler |
| CN211551671U (en) * | 2019-12-06 | 2020-09-22 | 亿利洁能科技有限公司 | Intelligent combustion control system of boiler |
| CN112199867A (en) * | 2020-11-19 | 2021-01-08 | 华能秦煤瑞金发电有限责任公司 | System and method for automatically calculating coal type switching time in coal bunker |
| CN112495568B (en) * | 2020-12-01 | 2023-04-07 | 西安热工研究院有限公司 | Coal mill coal type switching device and discrimination method based on specific heat change of coal |
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