CN103495488B - Full automatic control method and system for blast furnace pulverizing systems - Google Patents
Full automatic control method and system for blast furnace pulverizing systems Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010298 pulverizing process Methods 0.000 title abstract description 13
- 239000003245 coal Substances 0.000 claims abstract description 158
- 238000002360 preparation method Methods 0.000 claims description 52
- 239000007789 gas Substances 0.000 claims description 45
- 238000001035 drying Methods 0.000 claims description 42
- 239000004744 fabric Substances 0.000 claims description 30
- 239000000843 powder Substances 0.000 claims description 23
- 238000013461 design Methods 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 11
- 239000002817 coal dust Substances 0.000 claims description 10
- 239000002912 waste gas Substances 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000010792 warming Methods 0.000 claims description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003830 anthracite Substances 0.000 claims description 3
- 239000002802 bituminous coal Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010043268 Tension Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001149 cognitive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000007115 recruitment Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses a full automatic control method and system for blast furnace pulverizing systems. Each blast furnace is provided with at least two pulverizing systems. All the pulverizing systems share the same pulverized coal bunker. The method comprises the following steps: preparing and starting, wherein starting judgments and starting control are included; operation adjustments; halt control. The method can realize uniform operation through program control, adjusts the number of started pulverizing systems according to actual conditions, and realizes full automatic control operation of the blast furnace pulverizing systems. The method greatly reduces labor intensity and thought tension degree of workers and improves working efficiency so as to eradicate manual operation errors and solve the problems that the equipment operation rate is high, running fluctuation is large, and index stability is poor when a manual operation system is used. Moreover, the method enables one person to monitor a plurality of pulverizing systems, improves the running efficiency of the systems, reduces operation cost, enables the systems to have more time to be maintained and repaired, and enables the whole pulverizing system to be in a virtuous circle.
Description
Technical field
The present invention relates to a kind of control method and system of metallurgical industry Coal Grinding System of Pci.
Background technology
The each Iron Works of Present Domestic metallurgical industry all has coal injection system, coal injection system is divided into raw coal supply, powder process, winding-up three part, and powder process is most critical one ring in whole coal injection system, during the platform of coal pulverizer, production capacity, finished product coal dust qualification rate, electrical energy consumption per tonne of raw coal, gas consumption, equipment operation rate are test pulverized coal preparation system key indexs.Present Domestic each pulverized coal preparation system is manual hand manipulation, and it is large that individual difference and the different extremely each class of operating habit run the fluctuation of all kinds of index, and carelessness of operating personnel often causes operate miss.Cause finished product coal dust poor stability, equipment operation rate remains high, and ton coal is electric, gas consumption amount is high becomes a common fault, because system job rate is high, formed with conventional maintenance service time and conflict, some conventional overhauling projects must not be abandoned, cause system failure rate to rise, easily enter vicious circle.
Summary of the invention
The object of this invention is to provide a kind of blast furnace pulverized coal preparation system control method for fully automatic and system, in coal injection and pulverization of blast furnace process, realize Automatic Control operation, eliminate the system fluctuation because control operation manually brings, stop the error of control operation manually.
The technical scheme that the present invention realizes above goal of the invention is:
A kind of blast furnace pulverized coal preparation system control method for fully automatic, at least two pulverized coal preparation systems established by every blast furnace, and ownership powder system shares a Pulverized Coal Bin, it is characterized in that comprising following steps:
(i) prepare and start
1. judgement is started:
Start before pulverized coal preparation system and first detect current hour injecting coal quantity, coal dust warehousing powder amount, when coal dust warehousing powder amount is greater than 8 hours and a hour injecting coal quantity is less than coal-grinding board during design load, starts single pulverized coal preparation system, otherwise start ownership powder system;
2. control is started:
Start and control point three parts, drying oven, cloth bag collector, coal pulverizer;
When each equipment fault-free alarm signal in pulverized coal preparation system being detected, open drying oven exhaust gas valve, start combustion fan, start electronic ignition device igniting, open coke-stove gas valve and light coke-stove gas, monitor after flame temperature rises and open blast furnace gas control valve, drop into drying oven by setting air-fuel ratio and heat up, drying oven is warming up to 500 DEG C, and drying oven has started;
Vibration on Start-up sieve, startup star-shaped feeding machine, the pulse of startup cloth bag collector, cloth bag collector has started;
Start seal fan, start lubricating oil station, start coal pulverizer, coal pulverizer has started;
(ii) combustion adjustment:
After coal pulverizer starts, start main exhaust fan, if initial opening is 10%, start air-introduced machine, if initial opening is 30%, drying oven negative pressure value controls at standard value-100pa, open Flue valve, exhaust gas recirculation (egr) valve, close cold wind valve, waste gas valve, when coal pulverizer inlet temperature rise to 100 DEG C, outlet temperature remains on 90 DEG C and cloth bag collector inlet temperature remains on 80 DEG C, warm mill starts, and stablizes more than mill end warm during 1 minutes when cloth bag collector outlet temperature rises to 65 DEG C; Linearly open large main exhaust fan inlet adjustment valve, when main exhaust air rate reaches 55% design load, start feeder, by coal-air ratio 2:1 and every 2000m3/h air quantity corresponding 1000kg/h coal supply rate setting hour coal supply rate, open feeder inlet valve and start coal supply; The electric current of coal pulverizer for reference current, when current increase is more than 65% reference current value alarm, regulates minimizing 10% coal-supplying amount with electric current at the end of mill warm after coal pulverizer startup; When current increase stops coal security interlocking more than entering during 70% reference current value; Add that the summation of raw coal moisture content value is coal rate higher limit under normal feeder according to design load during coal-grinding board, first increase corresponding air quantity and increase coal-supplying amount again, close exhaust gas recirculation (egr) valve, air-introduced machine control valve opening is used to regulate negative pressure value in drying oven stove, linearly open large control valve opening when negative pressure value is greater than standard value in drying oven stove to adapt to, linearly reduce control valve opening when negative pressure value is less than standard value in drying oven stove to adapt to;
(iii) control is shut down:
First reduce by 50% coal-supplying amount, reducing coal pulverizer inlet temperature is≤2 times of outlet temperatures, main exhaust fan air quantity is regulated to be 60% design maximum air quantity when pulverizer outlet temperature rises to 85 DEG C, stop coal supply, close feeder inlet valve, open exhaust gas recirculation (egr) valve, close drying oven blast furnace gas control valve, reduce combustion fan controlling opening of valve to 10%, when coal pulverizer current value drops to 1A larger than reference current value, stop coal pulverizer, open cold wind valve, waste gas valve, close Flue valve, exhaust gas recirculation (egr) valve, air-introduced machine is stopped after air-introduced machine control valve.
A kind of blast furnace pulverized coal preparation system full-automatic control system, at least two pulverized coal preparation systems established by every blast furnace, and ownership powder system shares a Pulverized Coal Bin, it is characterized in that described control system comprises:
(i) preparation and start unit: for performing the start-up operation of pulverized coal preparation system;
Preparation and start unit comprise two parts:
1. starting judging unit: by detecting current hour injecting coal quantity, coal dust warehousing powder amount, determining to start single pulverized coal preparation system or ownership powder system according to imposing a condition;
2. control unit is started: start each equipment of pulverized coal preparation system according to imposing a condition;
(ii) combustion adjustment unit: in pulverized coal preparation system running, each equipment to be adjusted according to imposing a condition, completing pulverizing process;
(iii) control unit is shut down: closing each equipment of pulverized coal preparation system according to imposing a condition, terminating pulverizing process.
The inventive method and system realize unified operation by programme-control, intelligent optimization system operational factor, and start quantity according to actual conditions adjustment pulverized coal preparation system, realize the Automatic Control operation of Coal Grinding System of Pci.The inventive method and system significantly alleviate staff labor intensity, mental tension degree, improve operating efficiency, thus stop human operational error, eliminate the system cloud gray model fluctuation because operator's individual difference causes, the problems such as during solution manual system, equipment operation rate is high, operation fluctuation is large, index poor stability, also can realize the single monitoring to multiple pulverized coal preparation system, reduce recruitment cost.Application the inventive method and system control pulverized coal preparation system, can be implemented in different personnel's operation supervise and control process, ensure that pulverized coal preparation system stability and high efficiency ground runs, the system job rate range of decrease >=20%, reduce component wear, significantly reduce electrical energy consumption per tonne of raw coal and gas consumption, reduce operating cost while improving running efficiency of system, make system have the more time to be able to maintenance, make whole pulverized coal preparation system enter benign cycle.
Accompanying drawing explanation
Fig. 1 is pulverized coal preparation system process chart.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1:
Fig. 1 is common Coal Grinding System of Pci process chart, and pulverized coal preparation system forms primarily of dry gas producer (abbreviation drying oven), air-introduced machine, feeder, coal pulverizer, main exhaust fan, cloth bag collector and various valve member.
Control for Nangang's No. 3 blast furnace pulverized coal preparation systems, volume 2000m3, if two pulverized coal preparation systems, each pulverized coal preparation system adopts a 35t/h medium-speed pulverizer, drying oven adopts coke-stove gas igniting, blast furnace gas burns stove, use air-introduced machine to be mixed into the hot-blast stove flue gas that gives up and carry out drying, collect the abbreviated system using high concentration cloth bag collector to collect.
Blast furnace pulverized coal preparation system control method for fully automatic is as follows:
(i) prepare and start
1. judgement is started:
Current hour injecting coal quantity, coal dust warehousing powder amount is first detected before starting pulverized coal preparation system, when coal dust warehousing powder amount is greater than 8 hours and a hour injecting coal quantity is less than coal-grinding board during design load, start single pulverized coal preparation system, otherwise start ownership powder system (starting by pulverized coal preparation system number order);
2. control is started:
Start and control point three parts, drying oven, cloth bag collector, coal pulverizer;
When each equipment fault-free alarm signal in pulverized coal preparation system being detected, open drying oven exhaust gas valve, start combustion fan, start electronic ignition device igniting, open coke-stove gas valve and light coke-stove gas, monitor after flame temperature rises and open blast furnace gas control valve, drop into drying oven by the air-fuel ratio of the corresponding 1 cubic metre of blast furnace gas of every 0.65 cubic metre of combustion air and heat up, drying oven is warming up to 500 DEG C, and drying oven has started;
Vibration on Start-up sieve, startup star-shaped feeding machine, the pulse of startup cloth bag collector, cloth bag collector has started;
Start seal fan, start lubricating oil station, start coal pulverizer, coal pulverizer has started;
(ii) combustion adjustment:
After coal pulverizer starts, start main exhaust fan, if initial opening is 10%, start air-introduced machine, if initial opening is 30%, drying oven negative pressure value controls the tiny structure at standard value-100pa,-1200pa is less than during normal production, open Flue valve, exhaust gas recirculation (egr) valve, close cold wind valve, waste gas valve, when coal pulverizer inlet temperature rise to 100 DEG C, outlet temperature remains on 90 DEG C and cloth bag collector inlet temperature remains on 80 DEG C, warm mill starts, and rises to 65 DEG C and stablely to terminate more than mill warm during 1 minutes when cloth bag collector outlet temperature; Linearly open large main exhaust fan inlet adjustment valve, when main exhaust air rate reaches 55% design load, start feeder, by coal-air ratio 2:1 and every 2000m3/h air quantity corresponding 1000kg/h coal supply rate setting hour coal supply rate, open feeder inlet valve and start coal supply; The electric current of coal pulverizer is so that at the end of mill warm after coal pulverizer startup, electric current is for reference current, and in normal production, coal pulverizer current increase is within 50% of reference current value, when current increase is more than 65% reference current value alarm, regulates minimizing 10% coal-supplying amount; When current increase stops coal security interlocking more than entering during 70% reference current value; Add that the summation of raw coal moisture content value is coal rate higher limit under normal feeder according to design load during coal-grinding board, first increase corresponding air quantity and increase coal-supplying amount again, close exhaust gas recirculation (egr) valve, air-introduced machine control valve opening is used to regulate negative pressure value in drying oven stove, linearly open large control valve opening when negative pressure value is greater than standard value-100pa in drying oven stove to adapt to, linearly reduce control valve opening when negative pressure value is less than standard value in drying oven stove to adapt to;
For the mixed coal powder process of anthracite and bituminous coal mixing match, arrange pulverizer outlet temperature standard value to be less than 80 DEG C (75 DEG C is accepted value), initial coal pulverizer inlet temperature is outlet temperature standard value twice, coal pulverizer inlet temperature maximum is for being less than 3.5 times of outlet temperature standard values (200 DEG C ~ 240 DEG C is accepted value), and coal pulverizer inlet temperature often improves 10 DEG C and increases raw coal coal-supplying amount 1t/h; Cloth bag collector inlet outlet pressure differential is kept to be less than 1.6Kpa (usually remaining on 1.2Kpa ~ 1.4Kpa); when cloth bag collector inlet outlet pressure differential is greater than 1.8Kpa (usually reaching 1.9Kpa) alarm, the system-down interlocking when cloth bag collector inlet outlet pressure differential is greater than 2.0Kpa (usually reaching 2.1Kpa).
(iii) control is shut down:
First reduce by 50% coal-supplying amount, reducing coal pulverizer inlet temperature is≤2 times of outlet temperatures, and accepted value is 150 DEG C.Main exhaust fan air quantity is regulated to be 60% design maximum air quantity when pulverizer outlet temperature rises to 85 DEG C, stop coal supply, close feeder inlet valve, open exhaust gas recirculation (egr) valve, close drying oven blast furnace gas control valve, reduce combustion fan controlling opening of valve to 10%, when coal pulverizer current value drops to 1A larger than reference current value, stop coal pulverizer, open cold wind valve, waste gas valve, after closing Flue valve, exhaust gas recirculation (egr) valve, air-introduced machine control valve, stop air-introduced machine.
Embodiment 2:
Blast furnace pulverized coal preparation system full-automatic control system comprises:
(i) preparation and start unit: for performing the start-up operation of pulverized coal preparation system;
Preparation and start unit comprise two parts:
1. starting judging unit: by detecting current hour injecting coal quantity, coal dust warehousing powder amount, determining to start single pulverized coal preparation system or ownership powder system according to imposing a condition.Specifically: when detecting that Pulverized Coal Bin internal memory powder amount is greater than 8 hours and a hour injecting coal quantity is less than coal-grinding board during design load, starting single pulverized coal preparation system, otherwise starting ownership powder system;
2. control unit is started: start each equipment of pulverized coal preparation system according to imposing a condition.Specifically:
When each equipment fault-free alarm signal in pulverized coal preparation system being detected, open drying oven exhaust gas valve, start combustion fan, start electronic ignition device igniting, open coke-stove gas valve and light coke-stove gas, monitor after flame temperature rises and open blast furnace gas control valve, drop into drying oven by the air-fuel ratio of the corresponding 1 cubic metre of blast furnace gas of every 0.65 cubic metre of combustion air and heat up, drying oven is warming up to 500 DEG C, and drying oven has started;
Vibration on Start-up sieve, startup star-shaped feeding machine, the pulse of startup cloth bag collector, cloth bag collector has started;
Start seal fan, start lubricating oil station, start coal pulverizer, coal pulverizer has started;
(ii) combustion adjustment unit: in pulverized coal preparation system running, each equipment to be adjusted according to imposing a condition, completing pulverizing process.Specifically:
After coal pulverizer starts, start main exhaust fan, if initial opening is 10%, start air-introduced machine, if initial opening is 30%, drying oven negative pressure value controls at standard value-100pa, open Flue valve, exhaust gas recirculation (egr) valve, close cold wind valve, waste gas valve, when coal pulverizer inlet temperature rise to 100 DEG C, outlet temperature remains on 90 DEG C and cloth bag collector inlet temperature remains on 80 DEG C, warm mill starts, and terminates more than mill warm during 1 minutes when cloth bag collector outlet temperature rises to 65 DEG C and stablizes; Linearly open large main exhaust fan inlet adjustment valve, when main exhaust air rate reaches 55% design load, start feeder, by coal-air ratio 2:1 and every 2000m3/h air quantity corresponding 1000kg/h coal supply rate setting hour coal supply rate, open feeder inlet valve and start coal supply; The electric current of coal pulverizer is so that at the end of mill warm after coal pulverizer startup, electric current is for reference current, and in normal production, coal pulverizer current increase is within 50% of reference current value, when current increase is more than 65% reference current value alarm, regulates minimizing 10% coal-supplying amount; When current increase stops coal security interlocking more than entering during 70% reference current value; Add that the summation of raw coal moisture content value is coal rate higher limit under normal feeder according to design load during coal-grinding board, first increase corresponding air quantity and increase coal-supplying amount again, close exhaust gas recirculation (egr) valve, air-introduced machine control valve opening is used to regulate negative pressure value in drying oven stove, linearly open large control valve opening when negative pressure value is greater than standard value-100pa in drying oven stove to adapt to, linearly reduce control valve opening when negative pressure value is less than standard value in drying oven stove to adapt to;
For the mixed coal powder process of anthracite and bituminous coal mixing match, pulverizer outlet temperature standard value is set and is less than 80 DEG C, usually normal production Plays value is 75 DEG C, initial coal pulverizer inlet temperature is outlet temperature standard value twice, coal pulverizer inlet temperature maximum is for being less than 3.5 times of outlet temperature standard values (200 DEG C ~ 240 DEG C is accepted value), and coal pulverizer inlet temperature often improves 10 DEG C and increases raw coal coal-supplying amount 1t/h; Cloth bag collector inlet outlet pressure differential is kept to be less than 1.6Kpa (usually remaining on 1.2Kpa ~ 1.4Kpa); when cloth bag collector inlet outlet pressure differential is greater than 1.8Kpa (usually reaching 1.9Kpa) alarm, the system-down interlocking when cloth bag collector inlet outlet pressure differential is greater than 2.0Kpa (usually reaching 2.1Kpa).
(iii) control unit is shut down: closing each equipment of pulverized coal preparation system according to imposing a condition, terminating pulverizing process.Specifically:
First reduce by 50% coal-supplying amount, reducing coal pulverizer inlet temperature is≤2 times of outlet temperatures, accepted value is 150 DEG C, main exhaust fan air quantity is regulated to be 60% design maximum air quantity when pulverizer outlet temperature rises to 85 DEG C, stop coal supply, close feeder inlet valve, open exhaust gas recirculation (egr) valve, close drying oven blast furnace gas control valve, reduce combustion fan controlling opening of valve to 10%, when coal pulverizer current value drops to 1A larger than reference current value, stop coal pulverizer, open cold wind valve, waste gas valve, close Flue valve, exhaust gas recirculation (egr) valve, air-introduced machine is stopped after air-introduced machine control valve.
Adopt before control method of the present invention and system realize Automatic Control to pulverized coal preparation system, whole Non-follow control operation, runs fluctuating range large, due to personnel's individual difference, cognitive depth is different and cause equipment operation rate to remain high the difference of control ability, and production capacity is low, electrical energy consumption per tonne of raw coal, gas consumption are high.After use the inventive method realizes Automatic Control to pulverized coal preparation system, unified operator scheme, operating rate declines, and to maintaining with the sufficient time, system enters benign cycle.Owing to realizing automatically controlling to have liberated labour, realize the single monitoring to multiple system, significantly can reduce personnel's preparation.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (2)
1. a blast furnace pulverized coal preparation system control method for fully automatic, at least two pulverized coal preparation systems established by every blast furnace, and ownership powder system shares a Pulverized Coal Bin, it is characterized in that comprising following steps:
(i) prepare and start
start and judge:
Current hour injecting coal quantity, coal dust warehousing powder amount is first detected before starting pulverized coal preparation system, if detect that coal dust warehousing powder amount is greater than 8 hours winding-up amounts, and a hour injecting coal quantity is when being less than coal-grinding board during design load, starts single pulverized coal preparation system, otherwise start ownership powder system;
start and control:
Start and control point three parts, drying oven, cloth bag collector, coal pulverizer;
When each equipment fault-free alarm signal in pulverized coal preparation system being detected, open drying oven exhaust gas valve, start combustion fan, start electronic ignition device igniting, open coke-stove gas valve and light coke-stove gas, monitor after flame temperature rises and open blast furnace gas control valve, drop into drying oven by setting air-fuel ratio and heat up, drying oven is warming up to 500 DEG C, and drying oven has started;
Vibration on Start-up sieve, startup star-shaped feeding machine, the pulse of startup cloth bag collector, cloth bag collector has started;
Start seal fan, start lubricating oil station, start coal pulverizer, coal pulverizer has started;
(ii) combustion adjustment:
After coal pulverizer starts, start main exhaust fan, if initial opening is 10%, start air-introduced machine, if initial opening is 30%, drying oven negative pressure value controls at standard value-100pa, open Flue valve, exhaust gas recirculation (egr) valve, close cold wind valve, waste gas valve, when coal pulverizer inlet temperature rise to 100 DEG C, outlet temperature remains on 90 DEG C and cloth bag collector inlet temperature remains on 80 DEG C, warm mill starts, and terminates more than mill warm during 1 minutes when cloth bag collector outlet temperature rises to 65 DEG C and stablizes; Linearly open large main exhaust fan inlet adjustment valve, when main exhaust air rate reaches 55% design load, start feeder, set hour coal supply rate by coal-air ratio 2:1, open feeder inlet valve and start coal supply; The electric current of coal pulverizer for reference current, when current increase is more than 65% reference current value alarm, regulates minimizing 10% coal-supplying amount with electric current at the end of mill warm after coal pulverizer startup; When current increase stops coal security interlocking more than entering during 70% reference current value; Add that the summation of raw coal moisture content value is coal rate higher limit under normal feeder according to design load during coal-grinding board, first increase corresponding air quantity and increase coal-supplying amount again, close exhaust gas recirculation (egr) valve, air-introduced machine control valve opening is used to regulate negative pressure value in drying oven stove, linearly open large control valve opening when negative pressure value is greater than standard value in drying oven stove to adapt to, linearly reduce control valve opening when negative pressure value is less than standard value in drying oven stove to adapt to;
(iii) control is shut down:
First reduce by 50% coal-supplying amount, reducing coal pulverizer inlet temperature is≤2 times of outlet temperatures, main exhaust fan air quantity is regulated to be 60% design maximum air quantity when pulverizer outlet temperature rises to 85 DEG C, stop coal supply, close feeder inlet valve, open exhaust gas recirculation (egr) valve, close drying oven blast furnace gas control valve, reduce combustion fan controlling opening of valve to 10%, when coal pulverizer current value drops to 1A larger than reference current value, stop coal pulverizer, open cold wind valve, waste gas valve, close Flue valve, exhaust gas recirculation (egr) valve, air-introduced machine is stopped after air-introduced machine control valve.
2. blast furnace pulverized coal preparation system control method for fully automatic according to claim 1, it is characterized in that: for the mixed coal powder process of anthracite and bituminous coal mixing match, pulverizer outlet temperature standard value is set and is less than 80 DEG C, initial coal pulverizer inlet temperature is outlet temperature standard value twice, coal pulverizer inlet temperature maximum is for being less than 3.5 times of outlet temperature standard values, and coal pulverizer inlet temperature often improves 10 DEG C and increases raw coal coal-supplying amount 1t/h; Cloth bag collector inlet outlet pressure differential is kept to be less than 1.6Kpa, when cloth bag collector inlet outlet pressure differential is greater than 1.8Kpa alarm, the system-down interlocking when cloth bag collector inlet outlet pressure differential is greater than 2.0Kpa.
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| CN115305125A (en) * | 2022-09-06 | 2022-11-08 | 重庆钢铁股份有限公司 | Full negative pressure coal powder preparation system and method capable of self-circulating flue gas |
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| CN1076636C (en) * | 1999-12-29 | 2001-12-26 | 宝山钢铁股份有限公司 | Tail gas recirculation system for coal injection and pulverization of blast furnace and its control method |
| CN100369677C (en) * | 2006-04-24 | 2008-02-20 | 西安交通大学 | Powder-making system automatic control method for heat engine plant steel ball coal grinding mill |
| CN101327461A (en) * | 2007-06-22 | 2008-12-24 | 天津国华盘山发电有限责任公司 | Method for starting and stopping coal mill by program |
| CN100594066C (en) * | 2008-04-25 | 2010-03-17 | 东南大学 | Operation optimizing and energy-saving control method for intermediate storage iron shot mill flour milling system |
| CN101700503B (en) * | 2009-10-28 | 2012-07-04 | 中冶赛迪工程技术股份有限公司 | Method for setting and controlling pulverized coal preparing system |
| CN102492795B (en) * | 2011-12-15 | 2014-06-18 | 武汉钢铁(集团)公司 | Control system for pulverized coal making of pulverized coal injection |
| CN103331204B (en) * | 2013-06-26 | 2015-03-25 | 中冶南方工程技术有限公司 | Control method of medium-speed mill of blast furnace coal injection |
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