CN104482981A - Charged fire coal quantity calculation method for direct fired pulverizing system of double inlet and double outlet ball mill - Google Patents
Charged fire coal quantity calculation method for direct fired pulverizing system of double inlet and double outlet ball mill Download PDFInfo
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- CN104482981A CN104482981A CN201410797150.XA CN201410797150A CN104482981A CN 104482981 A CN104482981 A CN 104482981A CN 201410797150 A CN201410797150 A CN 201410797150A CN 104482981 A CN104482981 A CN 104482981A
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Abstract
The invention discloses a charged fire coal quantity calculation method for a direct fired pulverizing system of a double inlet and double outlet ball mill. The method comprises the following steps: 1, arranging a coal mill inlet wind quantity detection device (6) on a rear pipeline of an inlet wind quantity adjusting baffle plate (5) of the double inlet and double outlet ball mill (1); 2, arranging a bypass wind quantity measuring device on a rear pipeline of a bypass wind quantity adjusting baffle plate (10) of the double inlet and double outlet ball mill (1); 3, arranging an outlet powder feed pipe wind quantity measuring device on an outlet powder feed pipeline of the double inlet and double outlet ball mill (1); 4, calculating a capacity wind quantity value of the double inlet and double outlet ball mill (1) according to the measurement results of the steps 1 to 4; 5, calculating the powder yield of the coal mill according to a formula of Q1=Q2/K, wherein the powder yield of the coal mill is charged fire coal quantity. The problems such as water shortage and over-temperature caused by the fact that accurate measurement cannot be realized by the charged fire coal quantity calculation method for the direct fired pulverizing system of the double inlet and double outlet ball mill in the prior art are effectively solved.
Description
Technical field
The invention belongs to thermal power plant's control technology, particularly relate to a kind of double-inlet double-outlet steel ball coal mill straight blowing type milling system and enter stove Coal-fired capacity computing method.
Background technology
W type flame direct current cooker is the newtype boiler of joining supercritical unit in recent years just occurred, the supercritical unit that world Shou Tai joins W type flame direct current cooker is gone into operation in power plant of gold Zhushan County, Hunan for 2009, and domestic W type flame supercritical once-through boiler of having gone into operation all adopts the unit pulverized-coal system of joining double-inlet and double-outlet steel ball coal mill at present.Burner hearth heat balance is the key of super critical boiler stable operation, subcritical boiler is owing to there being this huge heat accumulating element of drum, heat is uneven slower on the impact of steam parameter, there is the adjustment leeway of long period, but it is uneven then very fast on the impact of steam parameter for super critical boiler heat, the also safety of the heating surface such as entail dangers to water-cooling wall, so the requirement of super critical boiler to burner hearth heat balance is higher.Super critical boiler, after transferring DC operation to, accurately must calculate stove fuel quantity of coming in and going out in real time, in this, as the Main Basis of boiler adjustment heat balance.Entering stove fuel quantity generally comprises into stove amount of fuel (or gas quantity), Coal-fired capacity, entering stove amount of fuel (or gas quantity) has online flow measurement device can Measurement accuracy in real time, stove Coal-fired capacity is entered for real-time, the boiler adopting the ball type pulverizer system can take machine supplying powder rotating speed characterized, the boiler of joining the unit pulverized-coal system pulverized coal preparation system of medium-speed pulverizer or fan mill can take feeder coal-supplying amount characterized adopting, and join entering stove Coal-fired capacity in real time and can not adopting above-mentioned two kinds of modes of double-inlet double-outlet steel ball coal mill straight blowing type milling system.
The principle of work of joining double-inlet double-outlet steel ball coal mill straight blowing type milling system is: coal-fired from run coal bin through feeder, the formula low speed coal mill that goes with each other all the time is entered after down drying pipe, be broken in low speed coal mill, grinding, hot blast is divided into two-way respectively to coal pulverizer two ends after coal pulverizer inlet air quantity controllable register (5), at coal pulverizer two ends, hot blast is divided into two-way again, one road hot blast enters down drying pipe (12) through coal pulverizer bypass air door (10), mix with the wind powder entering coal dust classifier (4) after preliminarily dried is carried out to fire coal, another road hot blast enters coal pulverizer through coal pulverizer capacity wind controllable register (9), hot blast carries the coal dust after grinding through coal dust classifier (4), underproof rough coal powder separates and again sends into coal pulverizer by coal dust classifier (4), qualified coal dust is then carried by hot blast and enters hearth combustion by powder feeding pipe (8).
Join double-inlet double-outlet steel ball coal mill straight blowing type milling system owing to not having machine supplying powder, entering stove Coal-fired capacity during historical facts or anecdotes cannot be characterized with machine supplying powder rotating speed.And although feeder coal-supplying amount can realize measuring in real time accurately, feeder coal-supplying amount can not enter stove Coal-fired capacity in real time by accurate characterization in the system of this pattern.Its feeder coal-supplying amount of the pulverized coal preparation system of this kind of pattern with the relation entering stove Coal-fired capacity is: coal pulverizer capacity air quantity increases/reduces → enter stove Coal-fired capacity to increase/minimizing → coal pulverizer in breeze material position reduce/increase → feeder coal-supplying amount increases/reduces.Namely enter stove Coal-fired capacity in real time and be decided by coal pulverizer capacity air quantity, and the coal-supplying amount of feeder regulates according to coal pulverizer material level (11).Because coal pulverizer inner core possesses suitable storage powder ability, after coal-supplying amount change, coal pulverizer breeze material position just there will be corresponding reaction after needing certain hour, only have after change appears in coal pulverizer material level, feeder coal-supplying amount just can do corresponding adjustment, therefore feeder coal-supplying amount always lags behind the change into stove Coal-fired capacity, the change into stove fuel quantity cannot be reflected timely and accurately, especially when a certain or several the disconnected coals of feeders appearance, when chute blockage or tripping operation, the total coal-supplying amount of feeder there will be instantaneous declining to a great extent, but actual as-fired coal powder amount does not reduce, if at this moment feedwater is in auto state automatically, according to the automatic control mode of design, feedwater flow will decline to a great extent, water-cooling wall lack of water overtemperature can be caused.In addition due to the cause of two-phase flow, the pulverized coal preparation system of this pattern also cannot be measured the coal dust amount in powder feeding pipe in real time.
In sum, adopt existing method accurately can not calculate the unit pulverized-coal system of joining double-inlet and double-outlet steel ball coal mill and enter stove Coal-fired capacity in real time.
Summary of the invention
The technical problem to be solved in the present invention: provide a kind of double-inlet double-outlet steel ball coal mill straight blowing type milling system to enter stove Coal-fired capacity computing method, cannot the problem such as the water-cooling wall lack of water overtemperature that causes of Measurement accuracy with the stove Coal-fired capacity that enters solving double-inlet double-outlet steel ball coal mill straight blowing type milling system of the prior art.
Technical solution of the present invention:
Double-inlet double-outlet steel ball coal mill straight blowing type milling system enters stove Coal-fired capacity computing method, and it comprises the steps:
Step 1, after the entrance air quantity controllable register of double-inlet and double-outlet steel ball coal mill, pipeline arranges coal pulverizer inlet Wind volume detector;
Step 2, (rear pipeline is arranged bypass apparatus for measuring air quantity at the bypass air quantity controllable register of double-inlet and double-outlet steel ball coal mill;
Step 3, outlet powder feeding pipe apparatus for measuring air quantity is set on the outlet powder feeding pipes of double-inlet and double-outlet steel ball coal mill;
Step 4, measurement result according to step 1-4, calculate the capacity airflow value of double-inlet and double-outlet steel ball coal mill;
Step 5, according to formula: Q1=Q2/K calculates the powder outlet quantity of coal pulverizer, and the powder outlet quantity of coal pulverizer is into stove Coal-fired capacity, in formula, Q1: coal pulverizer powder outlet quantity unit be ton/hour; Q2: coal pulverizer capacity air quantity unit be ton/hour; K: the formula that goes with each other all the time low speed coal mill wind powder ratio.
The computing method of the capacity airflow value of the double-inlet and double-outlet steel ball coal mill described in step 4 are that the entrance airflow value of double-inlet and double-outlet steel ball coal mill deducts bypass airflow value and obtains capacity airflow value; Or outlet powder feeding pipe airflow value deducts bypass airflow value and obtains capacity airflow value.
Beneficial effect of the present invention:
The present invention adopts and pipeline is arranged coal pulverizer inlet Wind volume detector detection entrance airflow value after the entrance air quantity controllable register of double-inlet and double-outlet steel ball coal mill, pipeline is arranged bypass apparatus for measuring air quantity after bypass air quantity controllable register and detect bypass airflow value, outlet powder feeding pipes arranges outlet powder feeding pipe apparatus for measuring air quantity to measure outlet powder feeding pipe airflow value, then calculate the capacity airflow value of double-inlet and double-outlet steel ball coal mill, calculate by capacity airflow value stove Coal-fired capacity of coming in and going out; The capacity air quantity accuracy adopting the method to obtain is high, trackability good, and enter stove Coal-fired capacity in real time and have good linear corresponding relation with it, therefore calculate to enter the accuracy of stove Coal-fired capacity in real time high, the change into stove Coal-fired capacity can not only be reflected in time, and not by the impact of feeder, the inventive method reality should in respond well, the stove Coal-fired capacity that enters efficiently solving double-inlet double-outlet steel ball coal mill straight blowing type milling system of the prior art cannot the problem such as the water-cooling wall lack of water overtemperature that causes of Measurement accuracy.
accompanying drawing illustrates:
Fig. 1 is various sides of the present invention amount device scheme of installations.
Embodiment
In accompanying drawing 1: 1 is the formula low speed coal mill that goes with each other all the time, 2 is run coal bin, and 3 is feeder, and 4 is coal dust classifier, 5 is coal pulverizer inlet air quantity controllable register, 6 is coal pulverizer inlet Wind volume detector, and 7 is hot air duct, and 8 is outlet powder feeding pipes, 9 is coal pulverizer capacity air quantity controllable register, 10 is coal pulverizer bypass air quantity controllable register, and 11 is coal pulverizer apparatus for measuring charge level, and 12 is down drying pipe, the principle of work of joining double-inlet double-outlet steel ball coal mill straight blowing type milling system is: coal-fired from run coal bin through feeder, the formula low speed coal mill that goes with each other all the time is entered after down drying pipe, be broken in low speed coal mill, grinding, hot blast is divided into two-way respectively to coal pulverizer two ends after coal pulverizer inlet air quantity controllable register, at coal pulverizer two ends, hot blast is divided into two-way again, one road hot blast enters down drying pipe through coal pulverizer bypass air door, mix with the wind powder entering coal dust classifier after preliminarily dried is carried out to fire coal, another road hot blast enters coal pulverizer through coal pulverizer capacity wind controllable register, hot blast carries the coal dust after grinding through coal dust classifier, underproof rough coal powder separates and again sends into coal pulverizer by coal dust classifier, qualified coal dust is then carried by hot blast and enters hearth combustion by powder feeding pipe.
Double-inlet double-outlet steel ball coal mill straight blowing type milling system of the present invention enters stove Coal-fired capacity computing method, on the basis of existing system, enters stove Coal-fired capacity through following method measurement:
Step 1, after the entrance air quantity controllable register 5 of double-inlet and double-outlet steel ball coal mill 1, pipeline arranges coal pulverizer inlet Wind volume detector 6;
Step 2, after the bypass air quantity controllable register 10 of double-inlet and double-outlet steel ball coal mill 1, pipeline arranges bypass apparatus for measuring air quantity, bypass apparatus for measuring air quantity 22,23 to be arranged on after two side bypass air quantity controllable registers 10 on pipeline respectively;
Step 3, outlet powder feeding pipe apparatus for measuring air quantity is set on the outlet powder feeding pipes 8 of double-inlet and double-outlet steel ball coal mill 1; Outlet powder feeding pipe apparatus for measuring air quantity 26,27 is arranged on two outlet powder feeding pipes 8 respectively;
Step 4, measurement result according to step 1-4, according to computing method: the entrance airflow value of double-inlet and double-outlet steel ball coal mill 1 deducts bypass airflow value and obtains capacity airflow value; Or outlet powder feeding pipe airflow value deducts bypass airflow value and obtains the capacity airflow value that capacity airflow value calculates double-inlet and double-outlet steel ball coal mill 1;
Step 5, according to formula: Q1=Q2/K calculates the powder outlet quantity of coal pulverizer, and the powder outlet quantity of coal pulverizer is into stove Coal-fired capacity, in formula, Q1: coal pulverizer powder outlet quantity unit be ton/hour; Q2: coal pulverizer capacity air quantity unit be ton/hour; K: the formula that goes with each other all the time low speed coal mill wind powder ratio, this value can be obtained by test, and coal pulverizer producer also provides selected value at coal pulverizer instructions, and when coal pulverizer material level maintains normal range, this value is a constant is 1.48.
Principle of the present invention is: when coal pulverizer material level maintains stable, coal pulverizer capacity air quantity and as-fired coal powder amount substantially linear, entering the capacity air quantity of coal pulverizer by measuring in real time, calculating and entering stove Coal-fired capacity in real time.
Claims (2)
1. double-inlet double-outlet steel ball coal mill straight blowing type milling system enters stove Coal-fired capacity computing method, and it comprises the steps:
Step 1, afterwards pipeline arranges coal pulverizer inlet Wind volume detector (6) at the entrance air quantity controllable register (5) of double-inlet and double-outlet steel ball coal mill (1);
Step 2, afterwards pipeline arranges bypass apparatus for measuring air quantity at the bypass air quantity controllable register (10) of double-inlet and double-outlet steel ball coal mill (1);
Step 3, outlet powder feeding pipe apparatus for measuring air quantity is set on the outlet powder feeding pipes of double-inlet and double-outlet steel ball coal mill (1);
Step 4, measurement result according to step 1-4, calculate the capacity airflow value of double-inlet and double-outlet steel ball coal mill (1);
Step 5, according to formula: Q1=Q2/K calculates the powder outlet quantity of coal pulverizer, and the powder outlet quantity of coal pulverizer is into stove Coal-fired capacity, in formula, Q1: coal pulverizer powder outlet quantity unit be ton/hour; Q2: coal pulverizer capacity air quantity unit be ton/hour; K: the formula that goes with each other all the time low speed coal mill wind powder ratio.
2. double-inlet double-outlet steel ball coal mill straight blowing type milling system according to claim 1 enters stove Coal-fired capacity computing method, it is characterized in that: the computing method of the capacity airflow value of the double-inlet and double-outlet steel ball coal mill (1) described in step 4 are that the entrance airflow value of double-inlet and double-outlet steel ball coal mill (1) deducts bypass airflow value and obtains capacity airflow value; Or outlet powder feeding pipe airflow value deducts bypass airflow value and obtains capacity airflow value.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017604A (en) * | 2016-07-13 | 2016-10-12 | 中国华电科工集团有限公司 | Fill level measuring device for ball mill, ball mill and coal milling system |
| CN108021743A (en) * | 2017-11-24 | 2018-05-11 | 华润电力（贺州）有限公司 | A kind of flexible measurement method of double inlet and outlet coal mill furnace coal weight |
| CN108508747A (en) * | 2018-01-12 | 2018-09-07 | 华润电力（贺州）有限公司 | Configure the once-through boiler unit model modelling approach of double inlet and outlet coal mill pulverized coal preparation system |
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| JPH1038258A (en) * | 1996-07-23 | 1998-02-13 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for calculating coal supply quantity during normal stop of mill for coal-fired boiler |
| CN103742937A (en) * | 2013-12-30 | 2014-04-23 | 广东电网公司电力科学研究院 | Coal feeding control method and system of double-inlet and double-outlet coal mill |
| CN103778343A (en) * | 2014-02-08 | 2014-05-07 | 国家电网公司 | Method for measuring instant as-fired coal amount of double-inlet double-outlet coal mill |
| CN103816987A (en) * | 2013-12-09 | 2014-05-28 | 国家电网公司 | Method for calculating powder output of double-inlet and double-outlet coal mill |
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2014
- 2014-12-22 CN CN201410797150.XA patent/CN104482981B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1038258A (en) * | 1996-07-23 | 1998-02-13 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for calculating coal supply quantity during normal stop of mill for coal-fired boiler |
| CN103816987A (en) * | 2013-12-09 | 2014-05-28 | 国家电网公司 | Method for calculating powder output of double-inlet and double-outlet coal mill |
| CN103742937A (en) * | 2013-12-30 | 2014-04-23 | 广东电网公司电力科学研究院 | Coal feeding control method and system of double-inlet and double-outlet coal mill |
| CN103778343A (en) * | 2014-02-08 | 2014-05-07 | 国家电网公司 | Method for measuring instant as-fired coal amount of double-inlet double-outlet coal mill |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017604A (en) * | 2016-07-13 | 2016-10-12 | 中国华电科工集团有限公司 | Fill level measuring device for ball mill, ball mill and coal milling system |
| CN108021743A (en) * | 2017-11-24 | 2018-05-11 | 华润电力（贺州）有限公司 | A kind of flexible measurement method of double inlet and outlet coal mill furnace coal weight |
| CN108508747A (en) * | 2018-01-12 | 2018-09-07 | 华润电力（贺州）有限公司 | Configure the once-through boiler unit model modelling approach of double inlet and outlet coal mill pulverized coal preparation system |
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| CN104482981B (en) | 2018-06-19 |
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Address after: 550002 Jiefang Road, Guiyang, Guizhou Province, No. 32 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF GUIZHOU POWER GRID CO., LTD. Address before: 550002 Jiefang Road 251, Guiyang, Guizhou Patentee before: Guizhou Power Test Institute |
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