CN105170296A - Fine explosion protection system of complete period inerting type coal pulverizing system - Google Patents
Fine explosion protection system of complete period inerting type coal pulverizing system Download PDFInfo
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- CN105170296A CN105170296A CN201510689609.9A CN201510689609A CN105170296A CN 105170296 A CN105170296 A CN 105170296A CN 201510689609 A CN201510689609 A CN 201510689609A CN 105170296 A CN105170296 A CN 105170296A
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- nitrogen
- channel
- oxygen
- valve
- explosion protection
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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
Abstract
The invention discloses a fine explosion protection system of a complete period inerting type coal pulverizing system. The fine explosion protection system comprises a pressure swing adsorption nitrogen making machine which is connected with a nitrogen chamber and an oxygen chamber; the oxygen chamber is connected with a combustor by an oxygen channel; the oxygen channel is communicated with a pulverized-coal pipeline; an oxygen channel valve is arranged on the oxygen channel; the nitrogen chamber is connected with potential explosive fringes by nitrogen channels; the nitrogen channels are provided with nitrogen channel valves on the potential explosive fringes; temperature sensors are arranged at the potential explosive fringes; the nitrogen channel valves, the nitrogen channels and the temperature sensors are respectively connected with a valve controller. The temperature sensors arranged at the potential explosive fringes in the coal pulverizing system can transmit temperature signals to the valve controller; when the temperature exceeds a normal threshold value, the nitrogen channel valve on a corresponding position is touched, and nitrogen is fed to an explosive fringe precisely, so that a fine explosion protection aim is realized; oxygen is mixed with the primary pulverized-coal before entering the combustor, so that the safe combustion of pulverized coal is ensured.
Description
Technical field
The invention belongs to large-sized station boiler security fields, be specifically related to a kind of meticulous explosion protection system of pulverized coal preparation system of complete period inerting.
Background technology
In recent years, along with the large scale mining of China's bituminous coal and lignite resource, in order to reduce coal-fired purchase cost, adapt to coal market change, burning is all mixed what carry out high-volatile bituminous coal and brown coal to greatest extent in each power plant, and this is to improving fuel situation in short supply, reducing cost of electricity-generating, improving economy of power plant benefit tool significance.Meanwhile, the safety issue such as explosion of Coal Pulverizing System of causing in pulverizing process of high-volatile coal also more and more receives publicity.
Application number is disclose a kind of device improving temperature of pulverizing flue gas of power station boiler in the utility model patent of 201120238795.1, this device utilizes the hot stove cigarette reheat machine centering low-temperature furnace smoke (or middle low-temperature furnace smoke and hot blast mixture) being arranged in boiler reversal chamber to carry out heating temperature raising, and it can be used as the drier of pulverized coal preparation system, to help the drying capacity improving boiler milling system, and control the oxygen amount entering pulverized coal preparation system, improve the explosion-proof capabilities of pulverized coal preparation system.
Application number is propose in the patent of invention of 200810013452.8 to store up formula bituminous coal fired boiler explosion-proof processing method and system thereof in one.This system directly extracts the moderate oven cigarette of 400 ~ 600 DEG C as drying medium from back-end ductwork reversal chamber, its oxygen content is lower than 16%, the oxygen content that reduces in pulverized coal preparation system drying is carried out to it, with the explosion-proof capabilities of this pulverized coal preparation system is used for after sending into pulverized coal preparation system import.
Application number be 201010013734.5 patent of invention disclose a kind of pulverized coal preparation system extracting low-temperature furnace smoke dry exhaust steam hot blast composite powder feeding bituminous coal meager coal general type.This system with middle warehouse formula low speed coal mill pulverized coal carried by hot air meager coal pulverized coal preparation system for prototype, part low-temperature furnace smoke is extracted as inert media and part drying medium through stove cigarette blower fan from induced-draught fan outlet, with take from hot blast that air preheater exports and be mixed into the dry and pulverized coal conveying of coal pulverizer, reduce the oxygen content of pulverized coal preparation system, the requirement of explosion proof grinding bituminous coal can be met.
Utilize flue gas recirculation to suppress the fire and explosive risks of pulverized coal preparation system to be a kind of comparatively conventional method, this kind of modification scheme mainly comprises to be smoked heat furnace from economizer exit and extracts black furnace cigarette two kinds from electric precipitation outlet.No matter but which kind of modification scheme, its improvement project is all larger, needs larger construction space.
It is the necessary condition of pulverized coal preparation system generation detonation that the ratio of combustible and air is in explosive range, what theoretical and experimental study showed inert gas adds the lower limit the upper limit reducing explosive range that can improve explosive range, namely reduce the explosive range of combustible, its detonation intensity can also be reduced.Common inert gas comprises N
2, CO
2and steam etc., these gases add the explosive range that greatly can reduce coal dust and volatile matter thereof, as being mixed into appropriate N
2the peak value at detonation thing detonation pressure peak can be made to reduce about 50%.
Current preparing nitrogen by separating air technology is very ripe, lower cost can be used to realize large-scale nitrogen oxygen separating, compare and extract black furnace flue gas from economizer extraction heating furnace flue with from electric precipitation outlet, the improvement project amount of installing nitrogen-making device near pulverized coal preparation system is less, is more applicable for the transformation of narrow space power plant.
Summary of the invention
The object of the invention is the pulverized coal preparation system explosion protection system proposing precise controlling of a kind of complete period, utilizes the datonation-inhibition character of inert gas, accurately delivers to potential knock region carry out inerting when needs, and then reaches the effect eliminating pulverized coal preparation system detonation.
For achieving the above object, the technical solution used in the present invention is: a kind of meticulous explosion protection system of pulverized coal preparation system of complete period inerting, comprise 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 with burner by oxygen channel, oxygen channel is connected with wind powder pipe road, and oxygen channel is provided with oxygen channel valve; Nitrogen chamber is connected with potential explosive fringe by channel of nitrogen, and channel of nitrogen establishes channel of nitrogen valve at each potential explosive fringe, and each potential explosive fringe set temperature sensor respectively, oxygen channel valve, channel of nitrogen valve are connected with valve control respectively with temperature sensor.
Described potential explosive fringe is raw coal bucket, coal pulverizer import, wood block separator, mill separator and pulverized coal feed pipe elbow.
Oxygen channel is provided with gas flowmeter near place of oxygen room.
Channel of nitrogen is provided with gas flowmeter near nitrogen chamber place.
The pulverized coal preparation system explosion protection system that the present invention proposes is provided with a set of swing adsorption nitrogen producing apparatus, and air separation is nitrogen and oxygen in idle work by this device, is stored in nitrogen chamber and oxygen room for subsequent use after pressurization respectively, easily there is position and the region of detonation in whole pulverized coal preparation system, as raw coal bucket, pulverized coal sieve, wood block separator, mill separator, pulverized-coal collector, pulverized coal feed pipe elbow etc. is all furnished with temperature sensor, Real-Time Monitoring is carried out to deathtrap, after potential knock region temperature exceedes secure threshold, valve control will open the nitrogen valve of correspondence position, the inert nitrogen with certain pressure can pass into overtemperature region exactly, not only can by outside the combustible component flammability limit fast lifting to actual concentrations in this region, the coal dust that can also be piled up deathtrap in time or fuel gas dispel, the detonation risk thoroughly eliminated danger a little.Oxygen room is connected with burner by oxygen channel, and oxygen channel is connected with wind powder pipe road, and before burning, oxygen mixes with wind powder, can ensure the safe combustion of coal dust at burner region.
Accompanying drawing explanation
Fig. 1 is overall system architecture schematic diagram of the present invention.
Wherein, 1-pressure change adsorption type nitrogen making machine, 2-nitrogen chamber, 3-oxygen room, 4-raw coal bucket, the import of 5-coal pulverizer, 6-wood block separator, 7-mill separator, 8-pulverized coal feed pipe elbow, 9-valve control, 10-nitrogen pipeline valve, 11-oxygen channel valve, 12 burners.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, a kind of meticulous explosion protection system of pulverized coal preparation system of complete period inerting, it comprises 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, oxygen room 2 crosses oxygen channel and is connected with burner 12, and oxygen channel is connected with wind powder pipe road, and oxygen channel is provided with oxygen channel valve 11, before burning, oxygen mixes with wind powder, can ensure the safe combustion of coal dust in burner 12 region; Nitrogen chamber 2 is connected with potential explosive fringe by channel of nitrogen, channel of nitrogen establishes channel of nitrogen valve 10 at each potential explosive fringe, potential explosive fringe is set temperature sensor respectively, oxygen channel valve 11, channel of nitrogen valve 12 are connected respectively at valve control 9 with temperature sensor, and described potential explosive fringe is raw coal bucket 4, coal pulverizer import 5, wood block separator 6, mill separator 7 and pulverized coal feed pipe elbow 8.Oxygen channel near oxygen room 3 is provided with gas flowmeter, and the channel of nitrogen near nitrogen chamber 2 is provided with gas flowmeter.
Air separation is nitrogen and oxygen in idle by pressure change adsorption type nitrogen making machine 1 of the present invention, be stored in nitrogen chamber 2 and oxygen room 3 after pressurization respectively, there is at whole pulverized coal preparation system the raw coal bucket 4 of potential fire and explosive risks, coal pulverizer import 5, wood block separator 6, the uniform temperature sensors that are equipped with in position such as mill separator 7 and pulverized coal feed pipe elbow 8, Real-Time Monitoring is carried out to the temperature of deathtrap, monitoring temperature signal is delivered to valve control 9, and then control nitrogen pipeline valve 10 switch of potential explosive fringe, oxygen delivers to combustor inlet by oxygen channel valve 11, mix with wind powder before combustion, the safe combustion of coal dust at burner region can be ensured.
Advantage of the present invention is: 1) by the real-time monitoring to pulverized coal preparation system each deathtrap temperature, realize the precise controlling to pulverized coal preparation system detonation risk; 2) by arranging the quick response that pressurized nitrogen room can realize detonation risk, detonation hidden danger is eliminated in time; 3) in a period of time, the oxygen of corresponding content is delivered to combustor inlet after spraying nitrogen, the combustion completion of coal dust can be ensured.
Claims (4)
1. the meticulous explosion protection system of the pulverized coal preparation system of a complete period inerting, it is characterized in that: it comprises 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 with burner by oxygen channel, oxygen channel is connected with wind powder pipe road, and oxygen channel is provided with oxygen channel valve; Nitrogen chamber is connected with potential explosive fringe by channel of nitrogen, and channel of nitrogen establishes channel of nitrogen valve at each potential explosive fringe, and each potential explosive fringe set temperature sensor respectively, oxygen channel valve, channel of nitrogen valve are connected with valve control respectively with temperature sensor.
2. the meticulous explosion protection system of pulverized coal preparation system of complete period inerting according to claim 1, is characterized in that: described potential explosive fringe is raw coal bucket, coal pulverizer import, wood block separator, mill separator and pulverized coal feed pipe elbow.
3. the meticulous explosion protection system of pulverized coal preparation system of complete period inerting according to claim 1, is characterized in that: oxygen channel is provided with gas flowmeter near place of oxygen room.
4. the meticulous explosion protection system of pulverized coal preparation system of complete period inerting according to claim 1, is characterized in that: channel of nitrogen is provided with gas flowmeter near nitrogen chamber place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN105170296A true CN105170296A (en) | 2015-12-23 |
| CN105170296B CN105170296B (en) | 2018-04-17 |
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| CN201510689609.9A Expired - Fee Related 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106964474A (en) * | 2017-05-16 | 2017-07-21 | 安徽工业大学 | A kind of coal pulverizer explosive-proof test 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 |
| CN112682811A (en) * | 2020-12-28 | 2021-04-20 | 国电电力邯郸东郊热电有限责任公司 | Coal blending and blending combustion system and method |
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| DE2526126A1 (en) * | 1974-06-17 | 1976-01-02 | Armco Steel Corp | SYSTEM FOR THE SAFE HANDLING OF POWDERED COAL |
| 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 |
| JP2014104395A (en) * | 2012-11-26 | 2014-06-09 | Hyuga Seirensho:Kk | System and method for preventing coal dust firing in pulverized coal mill equipment |
| 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 |
-
2015
- 2015-10-23 CN CN201510689609.9A patent/CN105170296B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2526126A1 (en) * | 1974-06-17 | 1976-01-02 | Armco Steel Corp | SYSTEM FOR THE SAFE HANDLING OF POWDERED COAL |
| 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 |
| JP2014104395A (en) * | 2012-11-26 | 2014-06-09 | Hyuga Seirensho:Kk | System and method for preventing coal dust firing in pulverized coal mill equipment |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106964474A (en) * | 2017-05-16 | 2017-07-21 | 安徽工业大学 | A kind of coal pulverizer explosive-proof test system and its detection method |
| CN106964474B (en) * | 2017-05-16 | 2018-04-20 | 安徽工业大学 | A kind of coal pulverizer explosive-proof test system |
| 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 |
| CN112682811A (en) * | 2020-12-28 | 2021-04-20 | 国电电力邯郸东郊热电有限责任公司 | Coal blending and blending combustion system and method |
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| CN105170296B (en) | 2018-04-17 |
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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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Granted publication date: 20180417 Termination date: 20191023 |
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| CF01 | Termination of patent right due to non-payment of annual fee |