CN110360593A - Coal pulverizer tripping control method under three operation of coal pulverizing mills of underload - Google Patents

Coal pulverizer tripping control method under three operation of coal pulverizing mills of underload Download PDF

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Publication number
CN110360593A
CN110360593A CN201910734721.8A CN201910734721A CN110360593A CN 110360593 A CN110360593 A CN 110360593A CN 201910734721 A CN201910734721 A CN 201910734721A CN 110360593 A CN110360593 A CN 110360593A
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coal
unit
underload
control
coal pulverizer
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CN110360593B (en
Inventor
陈欢乐
归一数
陆琳辉
王阳
王松
杨康
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Shanghai Minghua Power Technology Co Ltd
Shanghai Minghua Electric Power Technology and Engineering Co Ltd
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Shanghai Minghua Power Technology 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

The present invention relates to the coal pulverizer tripping control methods under a kind of three operation of coal pulverizing mills of underload, this method is under three operation of coal pulverizing mills of underload, judge whether that coal pulverizer tripping occurs, if yes, judged according to the practical power output of unit and remaining two coal pulverizer maximum output, unit fuel is controlled respectively, takes different control strategies to water management and turbine control, maintains the safe and stable operation of unit.Compared with prior art, the present invention, which has, solves coal pulverizer tripping control problem under the mill method of operation of underload three.

Description

Coal pulverizer tripping control method under three operation of coal pulverizing mills of underload
Technical field
The present invention relates to thermal technics and protection technique fields, more particularly, to a kind of fired power generating unit underload three The coal pulverizer tripping control method of (hereinafter referred to as: underload three grinds mode) under operation of coal pulverizing mills.
Background technique
Increasingly increased by the installation of new energy unit, the operation of thermal power generation unit running on the lower load has become the norm.Coal pulverizer The subsidiary engine equipment important as boiler system, the method for operation directly affect the safe and stable and economical operation of unit.Go out at present Unit safety stable operation considers between low-load period, and four coal pulverizer operations, any mill are still kept under running on the lower load The tripping of coal machine, other three coal pulverizers can quickly increase power output, maintain boiler heat load, reduce coal pulverizer tripping and pacify to unit The influence of full stable operation.But the operation of 4 coal pulverizers of underload is there is also separate unit coal-grinding machine-made egg-shaped or honey-comb coal briquets amount is low, coal pulverizer operational reliability The problems such as declining with stability, and pulverized coal preparation system entirety power consumption is higher, influencing Economical Operation of Light-Loaded Units.By using low Load three grinds the method for operation, can effectively improve the practical coal amount of separate unit coal pulverizer operation, and improving pulverized coal preparation system, safety is steady for a long time Fixed operation, while pulverized coal preparation system operation power consumption decline, improve unit performance driving economy.
In existing coal pulverizer tripping control technology, mainly for middle high load capacity (coal pulverizer runs number of units and is greater than 3), belong to RB (runback) scope is not directed to three coal pulverizer operating conditions of underload.Underload three is ground under the method for operation, Any coal pulverizer fault trip may be unable to maintain that since remaining two pulverizer capacities are measured power limit by separate unit maximum coal Unit normal output, boiler heat load bust seriously affect boiler and surely fire；Simultaneously as underload unit feedwater flow is lower, Small machine revolving speed is close to lower limit, and the feedwater flow under coal pulverizer trip behavior controls difficult, and Steam Temperature for Boiler fluctuation is larger, is easily accessible Hygrometric state operation, influences unit safety stable operation.Sequence valve steam admission mode Steam Turbine is maintenance machine under coal pulverizer trip behavior Group vapour pressure is easy to appear the serious cutting condition that last two valve of sequence valve is closed, influences Turbine Safety stable operation.Therefore, The method of operation is ground for underload three, the three mill methods of operation put into operation for a long time and guarantee unit safety is stablized under accident conditions to meet Service requirement, need to be to coal pulverizer tripping control strategy and the system for designing and developing under which.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of underload three mills Coal pulverizer tripping control method under the coal machine method of operation.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of coal pulverizer under three operation of coal pulverizing mills of underload trips control method, and this method is at underload three Under operation of coal pulverizing mills, judge whether that coal pulverizer tripping occurs, if it is, according to the practical power output of unit and remaining two coal-grindings Machine maximum output is judged, is controlled respectively unit fuel, is taken different control strategies to water management and turbine control, is tieed up Hold the safe and stable operation of unit.
Preferably, the coal pulverizer that judges whether to occur trips specifically:
Under three operation of coal pulverizing mills of unit underload, real-time monitoring pulverized coal preparation system operating condition, if any coal pulverizer Fault trip, triggering three coal pulverizers of underload run coal pulverizer trip signal.
Preferably, the practical total coal amount Q of unit before coal pulverizer being trippedfuelWith the remaining maximum for operating normally two coal pulverizers Contribute total coal amount QmaxBe compared, and according to comparison result, using different control strategies,
Preferably, if Qfuel> Qmax, using following control strategy:
1) unit CCS control mode is released, and boiler master and fuel control are switched to and are manually controlled, remaining two just Often the coal-supplying amount instruction of operation coal pulverizer is provided directly as separate unit most large quantities of coal, and maintaining unit pulverized coal preparation system power output is Qmax；
2) connection opens the adjacent oil gun in boiler residue operation coal seam, and boiler is maintained surely to fire；
3) judge QfuelWith QmaxDeviation whether be more than setting value, if it has, then the recycle valve of connection open water pump is to setting Positioning is set, and feedwater flow decrease speed is accelerated, and Steam Temperature for Boiler is maintained to stablize；Meanwhile triggering exports block increase pulse to water management Signal, and heat pump minimum safe revolving speed is set by rotary speed instruction lower limit；If it has not, then maintaining feedwater flow normal control side Formula；
4) steam turbine tune valve standard-sized sheet is then maintained into the vapour tune valve standard-sized sheet method of operation according to steam turbine；According to sequence valve into Way of steam, then unit is switched to the TF method of operation, and turbine main control bottoming is arranged, which is that last two valve of sequence valve will close When corresponding turbine main control output order.
Preferably, the setting value in the step 3) is 5 ± 1t/h.
Preferably, if Qfuel≤Qmax, using following control strategy:
1) unit CCS control mode is released, boiler master is switched to and is manually controlled, and remains defeated before coal pulverizer tripping Constant out, fuel master control remains automatic, and remaining two normal operation coal pulverizers increase power output, dimension automatically under fuel master control effect Holding unit pulverized coal preparation system power output is Qfuel；
2) connection opens the adjacent oil gun in boiler residue operation coal seam, and boiler is maintained surely to fire；
3) steam turbine tune valve standard-sized sheet is then maintained into the vapour tune valve standard-sized sheet method of operation according to steam turbine；According to sequence valve into Way of steam, then unit is switched to the TF method of operation, and turbine main control bottoming is arranged, which is that last two valve of sequence valve will close When corresponding turbine main control output order.
Compared with prior art, the present invention solves underload three and grinds coal pulverizer tripping control problem under the method for operation, more Technological gap has been mended, the three mill methods of operation has been met and puts into operation for a long time and ensure unit safety stable operation requirement under accident conditions.
Detailed description of the invention
Fig. 1 is work flow diagram of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiment is a part of the embodiments of the present invention, rather than whole embodiments.Based on this hair Embodiment in bright, those of ordinary skill in the art's every other reality obtained without making creative work Example is applied, all should belong to the scope of protection of the invention.
As shown in Figure 1, underload three of the present invention is ground under the method for operation, when coal pulverizer tripping occurs, according to unit it is practical go out The judgement of power and remaining two coal pulverizer maximum output is taken not to the control of unit fuel, to water management and turbine control respectively Same control strategy, maintains the safe and stable operation of unit:
Unit underload three is ground under the method for operation, real-time monitoring pulverized coal preparation system operating condition, and such as any coal pulverizer failure is jumped Lock, the triggering mill operation coal pulverizer trip signal of underload three.The practical total coal amount Q of unit before coal pulverizer is trippedfuelJust with residue The often total coal amount Q of maximum output of two coal pulverizers of operationmaxIt is compared, such as Qfuel> Qmax, then take strategy control as follows:
1) unit CCS control mode is released, boiler master and fuel control are cut manually, remaining two normal operation coal pulverizers Coal-supplying amount instruction be provided directly as separate unit most large quantities of coal, maintaining unit pulverized coal preparation system power output is Qmax；
2) connection opens the adjacent oil gun in boiler residue operation coal seam, and boiler is maintained surely to fire；
3) judge QfuelWith QmaxDeviation whether be more than certain value (5t/h or so), open water pump is joined if meeting condition Recycle valve accelerates feedwater flow decrease speed, Steam Temperature for Boiler is maintained to stablize to certain position.Meanwhile triggering is defeated to water management Block increase pulse signal out, and boundary is safely operated according to small machine, rotary speed instruction lower limit is set；
4) as into the vapour tune valve standard-sized sheet method of operation, then maintained steam turbine tune valve standard-sized sheet using steam turbine.Such as using sequence valve into Way of steam, then unit is switched to the TF method of operation, and turbine main control bottoming is arranged, which is that last two valve of sequence valve will close When corresponding turbine main control output order.
Unit underload three is ground under the method for operation, real-time monitoring pulverized coal preparation system operating condition, and such as any coal pulverizer failure is jumped Lock, the triggering mill operation coal pulverizer trip signal of underload three.The practical total coal amount Q of unit before coal pulverizer is trippedfuelJust with residue The often total coal amount Q of maximum output of two coal pulverizers of operationmaxIt is compared, such as Qfuel≤Qmax, then take strategy control as follows:
1) unit CCS control mode is released, boiler master is cut manually, and maintains the output before coal pulverizer tripping constant, combustion Expect that master control remains automatic, remaining two normal operation coal pulverizers increase power output under fuel master control effect automatically, maintain unit system Powder system power output is Qfuel；
2) connection opens the adjacent oil gun in boiler residue operation coal seam, and boiler is maintained surely to fire；
3) as into the vapour tune valve standard-sized sheet method of operation, then maintained steam turbine tune valve standard-sized sheet using steam turbine.Such as using sequence valve into Way of steam, then unit is switched to the TF method of operation, and turbine main control bottoming is arranged, which is that last two valve of sequence valve will close When corresponding turbine main control output order.
Specific embodiment
Certain 660MW unit underload three, which grinds coal pulverizer tripping control under the method for operation, to be implemented:
1) unit operating load 370MW grinds the method for operation, DCS control system real-time monitoring pulverized coal preparation system using B/C/D tri- Operating condition.C coal pulverizer fault trip, the triggering mill operation coal pulverizer trip signal of underload three.Unit is real before C coal pulverizer trips The total coal amount 126t/h in border is greater than the remaining total coal amount 120t/h of maximum output for operating normally two coal pulverizers, and (separate unit coal pulverizer is maximum Contribute 60t/h), then take strategy control as follows:
1) unit CCS control mode is released, boiler master and fuel control are cut manually, remaining two normal operation coal pulverizers Coal-supplying amount instruction be provided directly as separate unit most large quantities of coal 60t/h, maintaining unit pulverized coal preparation system power output is 120t/h；
2) connection opens CD layers of oil gun of boiler, and boiler is maintained surely to fire；
3) connection open water pump recycle valve accelerates feedwater flow decrease speed, Steam Temperature for Boiler is maintained to stablize to 30% position. Meanwhile triggering exports block increase pulse signal (pulse width 20s) to water management, and is safely operated boundary setting according to small machine and turns Speed instruction lower limit is 3150r/min；
4) unit then maintains steam turbine tune valve standard-sized sheet using steam turbine into the vapour tune valve standard-sized sheet method of operation.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right It is required that protection scope subject to.

Claims (6)

  1. The control method 1. coal pulverizer under a kind of three operation of coal pulverizing mills of underload trips, which is characterized in that this method exists Under three operation of coal pulverizing mills of underload, judge whether that coal pulverizer tripping occurs, if it is, according to the practical power output of unit and remaining Two coal pulverizer maximum output of remaininging are judged, are taken respectively to the control of unit fuel, to water management and turbine control different Control strategy maintains the safe and stable operation of unit.
  2. The control method 2. coal pulverizer under three operation of coal pulverizing mills of a kind of underload according to claim 1 trips, It is characterized in that, described judges whether to occur coal pulverizer tripping specifically:
    Under three operation of coal pulverizing mills of unit underload, real-time monitoring pulverized coal preparation system operating condition, if any coal pulverizer failure Tripping, triggering three coal pulverizers of underload run coal pulverizer trip signal.
  3. The control method 3. coal pulverizer under three operation of coal pulverizing mills of a kind of underload according to claim 1 trips, It is characterized in that, the practical total coal amount Q of unit before coal pulverizer is trippedfuelWith the remaining maximum output for operating normally two coal pulverizers Total coal amount QmaxIt is compared, and according to comparison result, using different control strategies.
  4. The control method 4. coal pulverizer under three operation of coal pulverizing mills of a kind of underload according to claim 3 trips, It is characterized in that, if Qfuel> Qmax, using following control strategy:
    1) unit CCS control mode is released, and boiler master and fuel control are switched to and are manually controlled, remaining two normal fortune The coal-supplying amount instruction of row coal pulverizer is provided directly as separate unit most large quantities of coal, and maintaining unit pulverized coal preparation system power output is Qmax；
    2) connection opens the adjacent oil gun in boiler residue operation coal seam, and boiler is maintained surely to fire；
    3) judge QfuelWith QmaxDeviation whether be more than setting value, if it has, then the recycle valve of connection open water pump is to setting position It sets, accelerates feedwater flow decrease speed, Steam Temperature for Boiler is maintained to stablize；Meanwhile triggering exports block increase pulse signal to water management, And heat pump minimum safe revolving speed is set by rotary speed instruction lower limit；If it has not, then maintaining feedwater flow normal control mode；
    4) steam turbine tune valve standard-sized sheet is then maintained into the vapour tune valve standard-sized sheet method of operation according to steam turbine；According to sequence valve into vapour side Formula, then unit is switched to the TF method of operation, and turbine main control bottoming is arranged, which is last two valve of sequence valve by when closing pairs The turbine main control output order answered.
  5. The control method 5. coal pulverizer under three operation of coal pulverizing mills of a kind of underload according to claim 4 trips, It is characterized in that, the setting value in the step 3) is 5 ± 1t/h.
  6. The control method 6. coal pulverizer under three operation of coal pulverizing mills of a kind of underload according to claim 3 trips, It is characterized in that, if Qfuel≤Qmax, using following control strategy:
    1) unit CCS control mode is released, boiler master is switched to and is manually controlled, and maintains the output before coal pulverizer tripping not Become, fuel master control remains automatic, and remaining two normal operation coal pulverizers increase power output under fuel master control effect automatically, maintains machine Group pulverized coal preparation system power output is Qfuel；
    2) connection opens the adjacent oil gun in boiler residue operation coal seam, and boiler is maintained surely to fire；
    3) steam turbine tune valve standard-sized sheet is then maintained into the vapour tune valve standard-sized sheet method of operation according to steam turbine；According to sequence valve into vapour side Formula, then unit is switched to the TF method of operation, and turbine main control bottoming is arranged, which is last two valve of sequence valve by when closing pairs The turbine main control output order answered.
CN201910734721.8A 2019-08-09 2019-08-09 Coal mill trip control method under low-load three-coal-mill operation mode Active CN110360593B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111013803A (en) * 2019-12-17 2020-04-17 浙江浙能技术研究院有限公司 Coal mill power distribution-based thermal power generating unit coal amount distribution control method
CN112393228A (en) * 2020-11-30 2021-02-23 华北电力科学研究院有限责任公司 RB (reverse bearing) jumping and grinding control device and method for octagonal tangential coal-fired boiler
CN112628711A (en) * 2021-01-11 2021-04-09 大唐黄岛发电有限责任公司 Auxiliary engine fault stable combustion control method based on 600MW supercritical unit low load

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CN105289830A (en) * 2015-11-30 2016-02-03 上海明华电力技术工程有限公司 Medium-speed coal mill start-stop control method based on online coal quantity compensation
CN105929710A (en) * 2016-04-18 2016-09-07 中国神华能源股份有限公司 RB overall working condition simulation test device and method
CN107185701A (en) * 2017-06-01 2017-09-22 中国神华能源股份有限公司 The method and apparatus resumed operation after being tripped for coal pulverizer

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JPH10281401A (en) * 1997-04-09 1998-10-23 Nippon Steel Corp Method and apparatus for preventing trip in low load operation of coal fired boiler
CN101482449A (en) * 2008-01-08 2009-07-15 浙江省电力试验研究院 Risk limitation method for fast runback test of thermoelectric generating set
CN103438419A (en) * 2013-08-07 2013-12-11 华电电力科学研究院 Method for starting coal pulverizing system before running of 1,000MW first-stage large bypass system unit
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111013803A (en) * 2019-12-17 2020-04-17 浙江浙能技术研究院有限公司 Coal mill power distribution-based thermal power generating unit coal amount distribution control method
CN111013803B (en) * 2019-12-17 2021-04-30 浙江浙能技术研究院有限公司 Coal mill power distribution-based thermal power generating unit coal amount distribution control method
CN112393228A (en) * 2020-11-30 2021-02-23 华北电力科学研究院有限责任公司 RB (reverse bearing) jumping and grinding control device and method for octagonal tangential coal-fired boiler
CN112628711A (en) * 2021-01-11 2021-04-09 大唐黄岛发电有限责任公司 Auxiliary engine fault stable combustion control method based on 600MW supercritical unit low load

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