CN113262869A - Coal crushing characteristic-based coal mill coal type switching device and discrimination method - Google Patents

Coal crushing characteristic-based coal mill coal type switching device and discrimination method Download PDF

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CN113262869A
CN113262869A CN202110498314.9A CN202110498314A CN113262869A CN 113262869 A CN113262869 A CN 113262869A CN 202110498314 A CN202110498314 A CN 202110498314A CN 113262869 A CN113262869 A CN 113262869A
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coal
mill
coal mill
unit consumption
type switching
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CN113262869B (en
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王智微
刘鹏飞
丁辉
张宪岭
颜刚
时标
郭志健
石伟栋
张建忠
李华
邱国梁
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Xian Thermal Power Research Institute Co Ltd
Huaneng Group Technology Innovation Center Co Ltd
Huaneng Qinmei Ruijin Power Generation Co Ltd
Huaneng Nanjing Jinling Power Generation Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Huaneng Group Technology Innovation Center Co Ltd
Huaneng Qinmei Ruijin Power Generation Co Ltd
Huaneng Nanjing Jinling Power Generation Co Ltd
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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
    • 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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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)

Abstract

A coal type switching device and a coal type judging method of a coal mill based on coal crushing characteristics comprise a power meter arranged on a motor matched with the coal mill, and a coal feeding flowmeter is arranged at a position where the side surface of the coal mill is connected with a coal bunker. According to the invention, a relevant measuring point and a data real-time acquisition and processing system are additionally arranged on the coal mill equipment, the unit consumption of the coal mill reflecting the coal quality crushing characteristic in the coal mill is calculated in real time, and the specific coal type switching time after new coal of the coal mill enters the coal mill is judged through the average unit consumption of the coal mill and the change rate of the average unit consumption of the coal mill.

Description

Coal crushing characteristic-based coal mill coal type switching device and discrimination method
Technical Field
The invention relates to the technical field of thermal power generation in the energy and power industry, in particular to a coal mill coal type switching device and a coal type judging method based on coal crushing characteristics.
Background
Coal in the coal-fired unit needs to enter a coal mill for crushing before burning and then enters a hearth for burning, when different coals enter the coal mill for crushing, the operation of the coal mill needs to be adjusted in the aspects of safety and economy, and the granularity of pulverized coal crushed by the coals and the temperature of pulverized coal conveyed by air are controlled in a key way to ensure the safe and economical operation of the coal mill.
In the traditional method, the specific time for newly feeding coal to enter a coal bunker is generally judged according to the coal feeding time of a boiler coal feeding system, and then an operator judges the approximate time for newly feeding coal to enter a coal pulverizer from the coal bunker according to experience, and then the operation requirement of the coal pulverizer is adjusted, such as adjusting the separation baffle of the coal pulverizer, the temperature of air conveying pulverized coal and the like. Therefore, the corresponding operation adjustment is usually started after new coal species enter the coal mill for a long time, and the specific time for switching the coal species of the coal mill cannot be judged in time, so that the safety (such as deflagration of the coal mill, burning of a powder pipe behind an outlet of the coal mill and the like) and the economical efficiency (such as increase of power consumption, increase of fly ash combustible substances and the like) of the coal mill are reduced.
Disclosure of Invention
In order to solve the problem that the switching time of the coal type when new coal enters a coal mill cannot be accurately and timely judged, the invention aims to provide a coal type switching device and a judging method of the coal mill based on the coal crushing characteristic.
In order to achieve the purpose, the technical scheme adopted by the invention and the beneficial effects of the invention are as follows:
a coal crushing characteristic-based coal type switching device of a coal mill comprises a motor power meter 2 arranged on a motor matched with the coal mill, and a coal feeding flowmeter 1 arranged on the side surface of the coal mill and connected with a coal bunker; 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 flow meter 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 flow meter 1 is arranged at an outlet of the coal feeder.
The power meter 2 is arranged on a motor matched with the coal mill.
A coal crushing characteristic-based coal mill coal type switching device distinguishing method comprises the following steps;
step 1:
a coal feeding flowmeter 1 and a power meter 2 are provided with measuring points, and relevant real-time data acquisition is realized;
step 2:
calculating the unit consumption e of the coal mill at any moment according to the acquired real-time datacoal(t)；
And step 3:
calculating unit consumption e of coal millcoal(t) moving average ecoal,pj,tx，t0Taking for 10-30 s;
and 4, step 4:
calculating the average unit consumption change rate epsilon of the coal millcoal,pj,txDt can be 1-5 s;
and 5:
when e iscoal,pj,txSum of absolute changes of ∈coal,pj,txRespectively greater than a certain set threshold value, and then ecoal,pj,txTends to be stable and ecoal,pj,txAnd if the coal type tends to 0, judging that the newly added coal enters the coal mill at the moment to complete the coal type switching in the coal mill.
In the second step, the unit consumption of the coal mill is ecoalThe formula for calculation of (t) is:
Figure BDA0003055361050000031
in the formula, ecoal-coal mill consumption, kWh/kg;
Wmill-motor power, kW;
mcoal-the coal feed rate into the coal mill, kg/h.
Coal mill unit consumption e in step IIIcoal(t) moving average ecoal,pj,txThe concrete formula is as follows:
Figure BDA0003055361050000032
in the formula, ecoal,pj,tx——txAverage unit consumption of coal mills at any moment, kWh/kg;
tx-moving average end time, s;
t0-a moving average time period, s;
ecoal(t) -coal mill real-time unit consumption, kWh/kg.
ecoal(t) is according to ecoalThe formula performs continuous data calculated in real time.
The average unit consumption change rate epsilon of the coal mill in the fourth stepcoal,pj,txComprises the following steps:
Figure BDA0003055361050000041
in the formula, epsiloncoal,pj,tx-average specific energy consumption change rate of coal mill, kW/kg;
dt-a period of time before tx time, s;
when at txWhen new coal enters the coal mill, the coal quality in the coal mill changes, and the average unit consumption of the coal mill is ecoal,pj,txThe average unit consumption change rate epsilon of the coal mill changes correspondinglycoal,pj,txThe coal mill can be changed correspondingly, and the average unit consumption e of the coal mill can be changed along with the complete replacement of the original coal in the coal mill by the new coalcoal,pj,txAlso stabilizes to a new value, the average specific consumption change rate epsilon of the coal millcoal,pj,txIt 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 coal crushing characteristic can be calculated in real time through the deployed related measuring 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 characteristic of the coal in the coal mill can be changed correspondingly after the coal quality in the coal mill is switched, the specific switching time of the coal type when new coal enters the coal mill to complete the coal mill is simply, conveniently and accurately judged in real time by utilizing two acquired data, so that an operator can be informed in time, related operation adjustment is synchronously carried out according to the change of the coal quality in the coal mill, and the safe and economic operation of the coal mill is ensured.
Drawings
Fig. 1 is a schematic structural diagram 1 (medium speed coal mill) of the device.
Fig. 2 is a schematic structural diagram of the device (steel ball coal mill) 2.
Fig. 3 is a schematic diagram of a calculation flow.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The concrete derivation process of the coal mill coal type switching device and the discrimination method based on the coal crushing characteristic is introduced as follows.
After entering the coal mill, the coal is crushed by the crushing part of the coal mill driven by the motor, and the coal is crushed by consuming electric power.
The electric power consumed by coal crushing of unit mass flow rate is the unit consumption of the coal mill, and the calculation formula is as follows:
Figure BDA0003055361050000051
in the formula, ecoal-coal mill consumption, kWh/kg;
Wmill-motor power, kW;
mcoal-the coal feed rate into the coal mill, kg/h.
Because the coal feeding flow and the motor power acquisition data entering the actual coal mill fluctuate, and the unit consumption of the coal mill calculated continuously fluctuates correspondingly, namely the unit consumption of the coal mill calculated by the formula changes along with time, a moving average method is needed to be adopted to perform stable processing on the unit consumption data of the coal mill, so that the average unit consumption of the coal mill at any moment is obtained, and the specific formula is as follows:
Figure BDA0003055361050000052
in the formula, ecoal,pj,tx——txAverage unit consumption of coal mills at any moment, kWh/kg;
tx-moving average end time, s;
t0-a moving average time period, s;
ecoal(t) -coal mill real-time unit consumption, kWh/kg.
ecoal(t) is according to ecoalThe formula performs continuous data calculated in real time.
After new coal enters the coal mill, the average unit consumption of the coal mill changes correspondingly due to different crushing characteristics of different coals (for example, for coal which is difficult to mill, the average unit consumption of the coal mill increases, and for coal which is easy to crush, the average unit consumption of the coal mill decreases), and the average unit consumption change rate of the coal mill is as follows:
Figure BDA0003055361050000061
in the formula, epsiloncoal,pj,tx-average specific energy consumption change rate of coal mill, kW/kg;
dt-a period of time before tx time, s.
Thus, when at txWhen new coal enters the coal mill, the coal quality in the coal mill changes, and the average unit consumption of the coal mill is ecoal,pj,txThe average unit consumption change rate epsilon of the coal mill changes correspondinglycoal,pj,txThe coal mill can be changed correspondingly, and the average unit consumption e of the coal mill can be changed along with the complete replacement of the original coal in the coal mill by the new coalcoal,pj,txAlso stabilizes to a new value, the average specific consumption change rate epsilon of the coal millcoal,pj,txIt will gradually go to zero.
Therefore, according to the easy difference of the crushing characteristics of coal, the concrete implementation steps of the application are as follows;
step 1:
and (3) installing measuring points according to the figure 1 or the figure 2, and realizing the acquisition of related real-time data.
Step 2:
calculating the unit consumption e of the coal mill at any moment according to the acquired real-time datacoal(t)。
And step 3:
calculating unit consumption e of coal millcoal(t) moving average ecoal,pj,tx，t0Can take 10-30 s.
And 4, step 4:
calculating the average unit consumption change rate epsilon of the coal millcoal,pj,tx，dt can take 1-5 s.
And 5:
when e iscoal,pj,txSum of absolute changes of ∈coal,pj,txRespectively greater than a certain set threshold value, and then ecoal,pi,txTends to be stable and ecoal,pj,txAnd if the coal type tends to 0, judging that the newly added coal enters the coal mill at the moment to complete the coal type switching in the coal mill.
The working principle of the coal mill coal type switching device and the discrimination method based on the coal crushing characteristic is as follows:
different coals have different crushing characteristics, and the electric quantity consumed by crushing the coal in unit mass is different. When the coal quality in the coal mill is stable, the unit coal consumption of the coal mill can be calculated in real time by using the coal supply flow meter and the motor power meter, and the average unit coal consumption of the coal mill and the average unit coal consumption change rate of the coal mill are obtained. When new coal enters the coal mill, the crushing characteristic of the coal is correspondingly changed, and the unit consumption of the coal mill, the average unit consumption of the coal mill and the change rate of the average unit consumption of the coal mill calculated in real time are correspondingly changed, so that the fact that the new coal enters the coal mill can be judged.

Claims (9)

1. A coal crushing characteristic-based coal type switching device of a coal mill is characterized by comprising a motor power meter (2) arranged on a motor matched with the coal mill, and a coal feeding flowmeter (1) arranged on the side surface of the coal mill and connected with a coal bunker; the coal feeding flowmeter (1) and the power meter (2) transmit the obtained information to the data acquisition and processing system (3).
2. The coal type switching device of the coal pulverizer based on the coal crushing characteristic as claimed in claim 1, wherein the coal feeding flow meter (1) is used for counting the flow rate of a coal bunker entering the coal pulverizer.
3. The coal pulverizer coal switching apparatus based on coal breakage characteristics of claim 1, wherein the motor power meter (2) is used for calculating power inside the coal pulverizer.
4. The coal type switching device of the coal pulverizer based on the coal crushing characteristic as claimed in claim 1, wherein the coal feeding flow meter (1) is arranged at an outlet of the coal feeder.
5. The coal type switching device of the coal mill based on the coal crushing characteristic as claimed in claim 1, wherein the power meter (2) is arranged on a supporting motor of the coal mill.
6. The method for judging the coal type switching device of the coal mill based on the coal crushing characteristic is characterized by comprising the following steps of;
step 1:
a coal feeding flowmeter (1) and a power meter (2) are provided with measuring points, and relevant real-time data acquisition is realized;
step 2:
calculating the unit consumption e of the coal mill at any moment according to the acquired real-time datacoal(t)；
And step 3:
calculating unit consumption e of coal millcoal(t) moving average ecoal，pj，tx，t0Taking for 10-30 s;
and 4, step 4:
calculating the average unit consumption change rate epsilon of the coal millcoal，pj，txDt can be 1-5 s;
and 5:
when e iscoal，pj，txSum of absolute changes of ∈coal，pj，txRespectively greater than a certain set threshold value, and then ecoal，pj，txTends to be stable and ecoal，pj，txAnd if the coal type tends to 0, judging that the newly added coal enters the coal mill at the moment to complete the coal type switching in the coal mill.
7. The method for determining coal type switching device of coal pulverizer based on coal crushing characteristic as claimed in claim 6, wherein in the second step, the unit consumption e of coal pulverizer iscoalThe formula for calculation of (t) is:
Figure FDA0003055361040000021
in the formula, ecoal-coal mill consumption, kWh/kg;
Wmill-motor power, kW;
mcoal-the coal feed rate into the coal mill, kg/h.
8. The method as claimed in claim 6, wherein the coal mill unit consumption e in the third step is lower than the coal mill unit consumption ecoal(t) moving average ecoal，pj，txThe concrete formula is as follows:
Figure FDA0003055361040000022
in the formula, ecoal，pj，tx——txAverage unit consumption of coal mills at any moment, kWh/kg;
tx-moving average end time, s;
t0-a moving average time period, s;
ecoal(t) -coal mill real-time unit consumption, kWh/kg.
ecoal(t) is according to ecoalThe formula performs continuous data calculated in real time.
9. The method as claimed in claim 6, wherein the average specific energy consumption rate ε is determined by the average specific energy consumption of the coal mill in the fourth stepcoal，pj，txComprises the following steps:
Figure FDA0003055361040000031
in the formula, epsiloncoal，pj，tx-coal pulverizer flatThe unit consumption change rate is kW/kg;
dt-a period of time before tx time, s;
when at txWhen new coal enters the coal mill, the coal quality in the coal mill changes, and the average unit consumption of the coal mill is ecoal，pj，txThe average unit consumption change rate epsilon of the coal mill changes correspondinglycoal，pj，txThe coal mill can be changed correspondingly, and the average unit consumption e of the coal mill can be changed along with the complete replacement of the original coal in the coal mill by the new coalcoal，pj，txAlso stabilizes to a new value, the average specific consumption change rate epsilon of the coal millcoal，pj，txIt 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
JP2007315636A (en) * 2006-05-24 2007-12-06 Chugoku Electric Power Co Inc:The Coal type changeover method and its system in coal- fired thermal power 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
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