CN105170296B - A kind of pulverized coal preparation system fine explosion protection system of complete period inerting - Google Patents
A kind of pulverized coal preparation system fine explosion protection system of complete period inerting Download PDFInfo
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- CN105170296B CN105170296B CN201510689609.9A CN201510689609A CN105170296B CN 105170296 B CN105170296 B CN 105170296B CN 201510689609 A CN201510689609 A CN 201510689609A CN 105170296 B CN105170296 B CN 105170296B
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- nitrogen
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- oxygen
- valve
- pulverized coal
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/04—Safety devices
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- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention discloses a kind of fine explosion protection system of pulverized coal preparation system of complete period inerting, it includes pressure change adsorption type nitrogen making machine, pressure change adsorption type nitrogen making machine is connected with nitrogen chamber and oxygen room, oxygen room is connected by oxygen channel with burner, oxygen channel is connected with wind powder pipe road, and oxygen channel is equipped with oxygen channel valve；Nitrogen chamber is connected by channel of nitrogen with potential explosive fringe, and channel of nitrogen sets channel of nitrogen valve in each potential explosive fringe, and each potential explosive fringe difference set temperature sensor, oxygen channel valve, channel of nitrogen valve and temperature sensor are connected with valve control respectively.Temperature signal is delivered to valve control by the temperature sensor installed in all potential explosive fringes of pulverized coal preparation system, after temperature exceedes normality threshold, the channel of nitrogen valve for touching relevant position accurately send nitrogen to fire and explosive risks area, achieve the purpose that fine explosion-proof, oxygen is mixed before burner with primary wind and powder, and then ensures the safety progress of coal dust firing.
Description
Technical field
The invention belongs to large-sized station boiler security fields, and in particular to a kind of pulverized coal preparation system of complete period inerting is finely prevented
Quick-fried system.
Background technology
In recent years, with China's bituminous coal and the large scale mining of lignite resource, in order to reduce coal-fired purchase cost, coal is adapted to
Burnings all is mixed in charcoal turn of the market, each power plant carry out high-volatile bituminous coal and lignite to greatest extent, this is to improving fuel confession
Should nervous situation, reduction cost of electricity-generating, raising economy of power plant benefit tool significance.At the same time, high-volatile coal exists
The safety issues such as the explosion of Coal Pulverizing System triggered in pulverizing process also increasingly attract attention.
A kind of raising pulverizing flue gas of power station boiler is disclosed in the utility model patent of Application No. 201120238795.1
The device of temperature, the device utilize hot stove cigarette reheat machine centering low-temperature furnace smoke (or the middle low temperature oven for being arranged in boiler reversal chamber
Cigarette and hot wind mixture) heating temperature raising is carried out, and as the drier of pulverized coal preparation system, to help to improve boiler milling system
Drying capacity, and control the oxygen amount into pulverized coal preparation system, improve the explosion-proof capabilities of pulverized coal preparation system.
It is proposed to store up formula bituminous coal fired boiler explosion-proof processing method in one kind in the patent of invention of Application No. 200810013452.8
And its system.The system directly extracts 400 ~ 600 DEG C of moderate oven cigarette as dried medium from back-end ductwork reversal chamber, its is oxygen-containing
Amount is less than 16%, is used for reducing the oxygen content in pulverized coal preparation system and it being dried after being sent into pulverized coal preparation system import, with this powder processed
The explosion-proof capabilities of system.
The patent of invention of Application No. 201010013734.5 discloses a kind of low-temperature furnace smoke drying steam exhaust hot wind that extracts and answers
Close the pulverized coal preparation system of powder feeding bituminous coal meager coal general type.The system is with middle warehouse formula low speed coal mill pulverized coal carried by hot air meager coal powder system
Unite as prototype, part low-temperature furnace smoke is extracted as inert media and partially dried medium from suction ventilator outlet through stove cigarette wind turbine, with
The hot wind for being derived from air preheater outlet is mixed into coal pulverizer drying and pulverized coal conveying, reduces the oxygen content of pulverized coal preparation system,
It disclosure satisfy that the requirement of explosion proof for grinding bituminous coal.
The fire and explosive risks for suppressing pulverized coal preparation system using flue gas recirculation is a kind of more common method, this kind of modification scheme master
To include extracting hot stove cigarette from economizer exit and exporting from electric precipitation extracting two kinds of black furnace cigarette.No matter but which kind of transformation side
Case, its improvement project are all bigger, it is necessary to larger construction space.
It is detonation occurs for pulverized coal preparation system necessary condition that the ratio of combustible and air, which is in explosive range, theoretical and examination
Test research and show that the addition of inert gas can improve the lower limit of explosive range and reduce the upper limit of explosive range, that is, reduce flammable
The explosive range of material, can also reduce its detonation intensity.Common inert gas includes N2、CO2And vapor etc., these
The addition of gas can be substantially reduced the explosive range of coal dust and its volatile matter, such as be mixed into appropriate N2It can make detonation thing detonation pressure
The peak value at peak reduces by 50% or so.
Preparing nitrogen by separating air technology is highly developed at present, can realize large-scale nitrogen oxygen using relatively low cost
From, compared at economizer extract heating furnace flue and from electric precipitation export extract black furnace flue gas, system is installed near pulverized coal preparation system
The improvement project amount smaller of nitrogen device, is more applicable for the transformation of narrow space power plant.
The content of the invention
Present invention aims at a kind of pulverized coal preparation system explosion protection system of complete period precise controlling is proposed, inert gas is utilized
Datonation-inhibition property, accurately send to potential knock region when needing and carries out inerting, and then eliminates pulverized coal preparation system detonation
Effect.
To achieve the above object, the technical solution adopted by the present invention is：A kind of pulverized coal preparation system of complete period inerting is finely prevented
Quick-fried system, including pressure change adsorption type nitrogen making machine, pressure change adsorption type nitrogen making machine are connected with nitrogen chamber and oxygen room, and oxygen room passes through oxygen
Gas passage is connected with burner, and oxygen channel is connected with wind powder pipe road, and oxygen channel is equipped with oxygen channel valve；Nitrogen chamber is led to
Cross channel of nitrogen with potential explosive fringe to be connected, channel of nitrogen sets channel of nitrogen valve in each potential explosive fringe, and each potential detonation is distinguished
Other set temperature sensor, oxygen channel valve, channel of nitrogen valve and temperature sensor are connected with valve control respectively.
The potential explosive fringe is that raw coal bucket, coal pulverizer import, wood block separator, tailing separator and pulverized coal feed pipe are curved
Head.
Oxygen channel is equipped with gas flowmeter at oxygen room.
Channel of nitrogen is equipped with gas flowmeter at nitrogen chamber.
Pulverized coal preparation system explosion protection system proposed by the present invention is equipped with a set of swing adsorption nitrogen producing apparatus, which works in idle
Nitrogen and oxygen are divided air into, is separately stored in after being overpressurized spare in nitrogen chamber and oxygen room；Whole pulverized coal preparation system
The position and region of detonation easily occurs, such as raw coal bucket, pulverized coal sieve, wood block separator, tailing separator, pulverized-coal collector, defeated powder
Channel bend etc. is arranged with temperature sensor, and danger zone is monitored in real time, when potential knock region temperature exceedes peace
After full threshold value, valve control will open the nitrogen valve of correspondence position, and the inert nitrogen with certain pressure can be passed through exactly
Overtemperature region, not only can be by outside combustible component flammability limit fast lifting to the actual concentrations in the region, can also be in time
Ground dispels the coal dust or fuel gas that danger zone is accumulated, the detonation risk thoroughly to eliminate danger a little.Oxygen room passes through oxygen
Passage is connected with burner, and oxygen channel is connected with wind powder pipe road, and oxygen is mixed with wind powder before burning, it is ensured that coal dust
In the safe combustion of burner region.
Brief description of the drawings
Fig. 1 is the overall system architecture schematic diagram of the present invention.
Wherein, 1- pressure change adsorption types nitrogen making machine, 2-nitrogen chamber, 3- oxygen room, 4- raw coal buckets, 5- coal pulverizer imports, 6- wood
Block separator, 7- tailing separators, 8- pulverized coal feed pipe elbows, 9- valve controls, 10- nitrogen pipeline valves, 11- oxygen channel valves
Door, 12 burners.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of fine explosion protection system of pulverized coal preparation system of complete period inerting, it includes pressure change adsorption type nitrogen making machine
1, pressure change adsorption type nitrogen making machine 1 is connected with nitrogen chamber 2 and oxygen room 3 by air compressor machine, and oxygen channel and burner are crossed by oxygen room 2
12 are connected, and oxygen channel is connected with wind powder pipe road, and oxygen channel is equipped with oxygen channel valve 11, oxygen and wind powder before burning
Mixing, it is ensured that safe combustion of the coal dust in 12 region of burner；Nitrogen chamber 2 passes through channel of nitrogen and potential explosive fringe phase
Even, channel of nitrogen sets channel of nitrogen valve 10 in each potential explosive fringe, and potential explosive fringe distinguishes set temperature sensor, oxygen channel
Valve 11, channel of nitrogen valve 12 and temperature sensor are connected respectively at valve control 9, and the potential explosive fringe is raw coal bucket 4, coal-grinding
Machine import 5, wood block separator 6, tailing separator 7 and pulverized coal feed pipe elbow 8.Oxygen channel close to oxygen room 3 is equipped with gas
Flowmeter body, the channel of nitrogen close to nitrogen chamber 2 are equipped with gas flowmeter.
The pressure change adsorption type nitrogen making machine 1 of the present invention divides air into nitrogen and oxygen in idle, is stored respectively after pressurization
In nitrogen chamber 2 and oxygen room 3, there is raw coal bucket 4, coal pulverizer import 5, the wooden unit of potential fire and explosive risks in whole pulverized coal preparation system
The positions such as separator 6, tailing separator 7 and pulverized coal feed pipe elbow 8 are arranged with temperature sensor, to the temperature of danger zone
Monitored in real time, monitoring temperature signal is delivered to valve control 9, and then controls the nitrogen pipeline valve 10 of potential explosive fringe to open
Close, oxygen is sent to combustor inlet by oxygen channel valve 11, mixed before combustion with wind powder, it is ensured that coal dust is in burner
The safe combustion in region.
It is an advantage of the invention that：1）By the real time monitoring to each danger zone temperature of pulverized coal preparation system, realize to powder system processed
The precise controlling for detonation risk of uniting；2）By setting pressurized nitrogen room to realize the quick response to detonation risk, disappear in time
Except detonation hidden danger；3）The oxygen of corresponding content is sent to combustor inlet in a period of time after spray nitrogen, it is ensured that the combustion of coal dust
Burn safety.
Claims (3)
- A kind of 1. fine explosion protection system of pulverized coal preparation system of complete period inerting, it is characterised in that：It includes pressure change adsorption type nitrogen making machine, Pressure change adsorption type nitrogen making machine is connected with nitrogen chamber and oxygen room, and oxygen room is connected by oxygen channel with burner, oxygen channel It is connected with wind powder pipe road, oxygen channel is equipped with oxygen channel valve, and oxygen is sent to combustor inlet by oxygen channel valve, Mixed before burning with wind powder；Nitrogen chamber is connected by channel of nitrogen with potential explosive fringe, and channel of nitrogen is set in each potential explosive fringe Channel of nitrogen valve, each potential explosive fringe difference set temperature sensor, oxygen channel valve, channel of nitrogen valve and temperature sensor point It is not connected with valve control；The potential explosive fringe is raw coal bucket, coal pulverizer import, wood block separator, tailing separator and pulverized coal feed pipe elbow.
- 2. the fine explosion protection system of pulverized coal preparation system of complete period inerting according to claim 1, it is characterised in that：Oxygen channel Gas flowmeter is equipped with oxygen room.
- 3. the fine explosion protection system of pulverized coal preparation system of complete period inerting according to claim 1, it is characterised in that：Channel of nitrogen Gas flowmeter is equipped with nitrogen chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510689609.9A CN105170296B (en) | 2015-10-23 | 2015-10-23 | A kind of pulverized coal preparation system fine explosion protection system of complete period inerting |
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| CN201510689609.9A CN105170296B (en) | 2015-10-23 | 2015-10-23 | A kind of pulverized coal preparation system fine explosion protection system of complete period inerting |
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| CN105170296B true CN105170296B (en) | 2018-04-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108237010B (en) * | 2017-05-16 | 2019-08-09 | 安徽工业大学 | A kind of coal pulverizer safe operation detection system and its detection method |
| CN110586308A (en) * | 2019-09-12 | 2019-12-20 | 广东金方圆安全技术检测有限公司 | Explosion suppression detection intelligent control protection system of feed grinder |
| CN112682811B (en) * | 2020-12-28 | 2022-12-16 | 国电电力邯郸东郊热电有限责任公司 | Coal blending and blending combustion system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0019408B1 (en) * | 1979-05-07 | 1983-09-14 | The Cleveland-Cliffs Iron Company | Method of inhibiting explosions in a pulverizing system |
| CN2403490Y (en) * | 2000-01-28 | 2000-11-01 | 苏州市宏运净化设备有限公司 | Underground explosion-proof nitrogen generator |
| CN102303758A (en) * | 2010-11-26 | 2012-01-04 | 徐州中矿奥特麦科技有限公司 | Coal storage silo safety protection process and protection system |
| CN202328314U (en) * | 2011-09-21 | 2012-07-11 | 西安交通大学 | Large concentrative coal powder preparation system |
| CN205084856U (en) * | 2015-10-23 | 2016-03-16 | 河南省锅炉压力容器安全检测研究院 | Meticulous fuel detonation suppressant system of powder process system of lazyization of complete period |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3912015A (en) * | 1974-06-17 | 1975-10-14 | Armco Steel Corp | System for the safe handling of pulverized coal |
| JP6011933B2 (en) * | 2012-11-26 | 2016-10-25 | 株式会社日向製錬所 | Coal dust ignition prevention system and coal dust ignition prevention method for pulverized coal mill system |
-
2015
- 2015-10-23 CN CN201510689609.9A patent/CN105170296B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0019408B1 (en) * | 1979-05-07 | 1983-09-14 | The Cleveland-Cliffs Iron Company | Method of inhibiting explosions in a pulverizing system |
| CN2403490Y (en) * | 2000-01-28 | 2000-11-01 | 苏州市宏运净化设备有限公司 | Underground explosion-proof nitrogen generator |
| CN102303758A (en) * | 2010-11-26 | 2012-01-04 | 徐州中矿奥特麦科技有限公司 | Coal storage silo safety protection process and protection system |
| CN202328314U (en) * | 2011-09-21 | 2012-07-11 | 西安交通大学 | Large concentrative coal powder preparation system |
| CN205084856U (en) * | 2015-10-23 | 2016-03-16 | 河南省锅炉压力容器安全检测研究院 | Meticulous fuel detonation suppressant system of powder process system of lazyization of complete period |
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Inventor after: Li Wenguang Inventor after: Han Baosheng Inventor after: Liu Qunan Inventor after: Zhang Lan Inventor after: Wang Xuebin Inventor after: Liu Yuanyi Inventor after: Zhang Zhankui Inventor after: Tan Houzhang Inventor after: Guo Chaoling Inventor after: Li Zhanbin Inventor after: Cui Xiaowei Inventor before: Li Wenguang Inventor before: Zhang Lan Inventor before: Wang Xuebin Inventor before: Liu Yuanyi Inventor before: Yu Hongli Inventor before: Tan Houzhang Inventor before: Li Jing Inventor before: Li Zhanbin Inventor before: Qi Xiaobing |
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