CN105955165A - Safety control method for coal powder storage process in sealed space - Google Patents
Safety control method for coal powder storage process in sealed space Download PDFInfo
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- CN105955165A CN105955165A CN201610371269.XA CN201610371269A CN105955165A CN 105955165 A CN105955165 A CN 105955165A CN 201610371269 A CN201610371269 A CN 201610371269A CN 105955165 A CN105955165 A CN 105955165A
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- coal dust
- confined space
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- sealed space
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
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- Solid Fuels And Fuel-Associated Substances (AREA)
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Abstract
The invention discloses a safety control method for a coal powder storage process in a sealed space, and the method comprises the steps: carrying out the granularity screening of coal powder in the sealed space, and obtaining the granularity distribution condition; enabling high volatile coal to be smashed, and obtaining high volatile coal powder with the minimum granularity; carrying out a coal powder explosion test, and obtaining an explosion critical oxygen concentration C<O2>; carrying out a temperature programming oxidation test, obtaining critical parameters of CO concentration sharp increase: temperature T<CO> and CO concentration C<CO>; monitoring the coal powder temperature, oxygen concentration and CO concentration; carrying out the nitrogen charging of the sealed space when the coal powder temperature in the sealed space is not less than T<CO>, or the CO concentration in the sealed space is not less than C<CO> or the oxygen concentration in the sealed space is not less than C<O2>, and ending the step till the coal powder temperature in the sealed space is less than T<CO>, the CO concentration in the sealed space is less than C<CO> and the oxygen concentration in the sealed space is less than C<O2>. The method can guarantee the safety of the storage process of coal powder in the sealed space.
Description
Technical field
The present invention relates to the security control field of inflammable and explosive substances, be specifically related to the method for controlling security of coal dust storing process in a kind of confined space.
Background technology
Pulverized Coal Bin is to stack the large-scale hermetic container of storage coal dust.The coal dust explosion of confined space is the one in the blast of numerous combustible dust, and it is relatively conventional in heavy duty industrial produces, and relates to numerous industries such as chemical industry, metallurgy, colliery, and its explosive force is huge to the hazardness of production and heavy industry practitioner.Therefore, we are in the urgent need to the method for controlling security of coal dust storing process in a kind of confined space, to ensure coal dust safety of storing process in confined space.
Summary of the invention
It is an object of the invention to provide the method for controlling security of coal dust storing process in a kind of confined space, this control method can ensure that coal dust safety of storing process in confined space.
The technical solution adopted in the present invention is:
In a kind of confined space, the method for controlling security of coal dust storing process, comprises the steps:
1), take confined space in coal dust do sizing, obtain its particle size distribution situation；
2), by raw coal prepare high-volatile coal, and high-volatile coal be crushed to step 1) in minimum one-level in coal powder size distribution, obtain the high volatile coal dust of minimum grade；
3), with step 2) in the high volatile coal dust of minimum grade carry out coal dust explosion test, draw the blast critical dissolved oxygen concentration C of the high volatile coal dust of this minimum gradeO2；
4), with step 2) in the high volatile coal dust of minimum grade carry out temperature programmed oxidation experiment, draw the critical parameters that the oxidizing process CO concentration of the high volatile coal dust of this minimum grade is increased sharply: temperature TCOWith CO concentration CCO；
5), the coal dust temperature in confined space, oxygen concentration, CO concentration are monitored；
6), as the coal dust temperature >=T in confined spaceCOAnd/or the CO concentration >=C in confined spaceCOTime, confined space is carried out nitrogen charging process, mechanical agitation heat radiation simultaneously, mist cooling；As the oxygen concentration >=C in confined spaceO2, confined space is carried out nitrogen charging process；
7) the coal dust temperature < T in confined space, is treatedCO, oxygen concentration < C in confined spaceO2, CO concentration < C in confined spaceCOTime, stop nitrogen charging, mechanical agitation, spraying.
Further scheme is, repeats step 5)-step 7).
The beneficial effects of the present invention is:
Consider in terms of coal dust temperature in confined space, oxygen concentration, CO concentration three, it is ensured that high-volatile coal is the safety of storing process in confined space, it is to avoid the generation of explosive event, it is ensured that safety.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment 1
In confined space, the method for controlling security of coal dust storing process, comprises the steps:
Step 1, uniformly take coal dust 1000g in confined space, carry out sizing, obtain the distribution situation of its sizing: ω (>=0.5mm)=1.4%, ω (0.4～0.5mm)=6.1%, ω (0.3～0.4mm)=12.0%, ω (0.2～0.3mm)=22.0%, ω (0.1～0.2mm)=42.0%, ω (＜ 0.1mm)=16.5%；
Step 2, prepared high-volatile coal 500g by raw coal, detect dry ash free basis fugitive constituent VdafIt is 36.01%, 500g high-volatile coal is all crushed to the minimum one-level in coal powder size distribution in step 1, be i.e., within coal powder size 0.1mm, obtain the high volatile coal dust of minimum grade；
Step 3, the high volatile coal dust 6g taking minimum grade (within coal powder size 0.1mm) carry out coal dust explosion test, start constantly to turn down oxygen concentration till not exploding from air atmosphere, obtain the blast critical dissolved oxygen concentration C of high volatile coal dust sample within coal powder size 0.1mmO2It is 9.4%；
Step 4, the high volatile coal dust 50g taking minimum grade (within coal powder size 0.1mm) carry out temperature programmed oxidation experiment, draw the critical temperature T of the oxidizing process CO concentration surge of the high volatile coal dust of this minimum gradeCOIt is 80 DEG C, critical CO concentration CCOFor 150ppm；
Step 5, the coal dust temperature in confined space, oxygen concentration, CO concentration are monitored；
Step 6, storage a period of time after, the coal dust temperature monitored in confined space reaches 80 DEG C, the oxygen concentration 7.4% in confined space, CO concentration 167ppm in confined space；Now, the 80 DEG C >=T of coal dust temperature in confined spaceCO, CO concentration 167ppm >=C in confined spaceCO, show the coal dust in confined space to have started to slowly and aoxidize intensification, confined space need to be carried out nitrogen charging process, mechanical agitation heat radiation simultaneously, mist cooling；
Step 7, the coal dust temperature < T treated in confined spaceCO, CO concentration < C in confined spaceCOTime, stop nitrogen charging, mechanical agitation, spraying.
Embodiment 2
In confined space, the method for controlling security of coal dust storing process, comprises the steps:
Step 1, uniformly take coal dust 1000g in confined space, carry out sizing, obtain the distribution situation of its sizing: ω (>=0.5mm)=1.4%, ω (0.4～0.5mm)=6.1%, ω (0.3～0.4mm)=12.0%, ω (0.2～0.3mm)=22.0%, ω (0.1～0.2mm)=42.0%, ω (＜ 0.1mm)=16.5%；
Step 2, prepared high-volatile coal 500g by raw coal, detect dry ash free basis fugitive constituent VdafIt is 36.01%, 500g high-volatile coal is all crushed to the minimum one-level in coal powder size distribution in step 1, be i.e., within coal powder size 0.1mm, obtain the high volatile coal dust of minimum grade；
Step 3, the high volatile coal dust 6g taking minimum grade (within coal powder size 0.1mm) carry out coal dust explosion test, start constantly to turn down oxygen concentration till not exploding from air atmosphere, obtain the blast critical dissolved oxygen concentration C of high volatile coal dust sample within coal powder size 0.1mmO2It is 9.4%；
Step 4, the high volatile coal dust 50g taking minimum grade (within coal powder size 0.1mm) carry out temperature programmed oxidation experiment, draw the critical temperature T of the oxidizing process CO concentration surge of the high volatile coal dust of this minimum gradeCOIt is 70 DEG C, critical CO concentration CCOFor 250ppm；
Step 5, the coal dust temperature in confined space, oxygen concentration, CO concentration are monitored；
Step 6, storage a period of time after, the coal dust temperature monitored in confined space reaches 56 DEG C, the oxygen concentration 12.2% in confined space, CO concentration 31ppm in confined space；Now, the oxygen concentration 12.2% >=C in confined spaceO2, show oxygen concentration to be caused to raise by leakage oxygen, nitrogen charging process need to be carried out；
Step 7, the oxygen concentration < C treated in confined spaceO2Time, stop nitrogen charging.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted, and all these modifications and variations all should be belonged to the protection domain of claims of the present invention.
Claims (1)
1. the method for controlling security of coal dust storing process in a confined space, it is characterised in that comprise the steps:
1), take confined space in coal dust do sizing, obtain its particle size distribution situation；
2), by raw coal prepare high-volatile coal, and high-volatile coal be crushed to step 1) in coal powder size distribution
In minimum one-level, obtain the high volatile coal dust of minimum grade；
3), with step 2) in the high volatile coal dust of minimum grade carry out coal dust explosion test, draw this minimum grade
The blast critical dissolved oxygen concentration C of high volatile coal dustO2；
4), with step 2) in the high volatile coal dust of minimum grade carry out temperature programmed oxidation experiment, draw this granule
The critical parameters that the oxidizing process CO concentration of the high volatile coal dust of level is increased sharply: temperature TCOWith CO concentration CCO；
5), the coal dust temperature in confined space, oxygen concentration, CO concentration are monitored；
6), as the coal dust temperature >=T in confined spaceCOAnd/or the CO concentration >=C in confined spaceCOTime, to confined air
Between carry out nitrogen charging process, mechanical agitation heat radiation simultaneously, mist cooling；As the oxygen concentration >=C in confined spaceO2, to airtight
Space carries out nitrogen charging process；
7) the coal dust temperature < T in confined space, is treatedCO, oxygen concentration < C in confined spaceO2, CO in confined space dense
Degree < CCOTime, stop nitrogen charging, mechanical agitation, spraying.
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| CN201610371269.XA CN105955165B (en) | 2016-05-30 | 2016-05-30 | The method of controlling security of coal dust storing process in a kind of confined space |
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| CN201610371269.XA CN105955165B (en) | 2016-05-30 | 2016-05-30 | The method of controlling security of coal dust storing process in a kind of confined space |
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| CN105955165A true CN105955165A (en) | 2016-09-21 |
| CN105955165B CN105955165B (en) | 2018-06-08 |
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Citations (7)
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| JPS6288708A (en) * | 1985-10-15 | 1987-04-23 | Fujita Corp | Coal dust explosion preventing device in indoor coal storing facility |
| CN1173612A (en) * | 1996-12-06 | 1998-02-18 | 华北电力大学（北京） | Coal powder self-firing and self-explosion monitoring and forecasting system |
| CN1595129A (en) * | 2004-07-16 | 2005-03-16 | 中国矿业大学 | Thermal insulation testing process and apparatus for simulating coal spontaneous combustion procedure |
| CN201458098U (en) * | 2009-06-10 | 2010-05-12 | 煤炭科学研究总院 | Pulverized coal warehouse |
| WO2012003542A1 (en) * | 2010-07-07 | 2012-01-12 | Skill Pro Services Pty Ltd | Flame or explosion suppressant for combustible dust |
| CN102410552A (en) * | 2011-09-21 | 2012-04-11 | 西安交通大学 | Large-scale centralized preparation system for pulverized coal and distribution method |
| JP2014104395A (en) * | 2012-11-26 | 2014-06-09 | Hyuga Seirensho:Kk | System and method for preventing coal dust firing in pulverized coal mill equipment |
-
2016
- 2016-05-30 CN CN201610371269.XA patent/CN105955165B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6288708A (en) * | 1985-10-15 | 1987-04-23 | Fujita Corp | Coal dust explosion preventing device in indoor coal storing facility |
| CN1173612A (en) * | 1996-12-06 | 1998-02-18 | 华北电力大学（北京） | Coal powder self-firing and self-explosion monitoring and forecasting system |
| CN1595129A (en) * | 2004-07-16 | 2005-03-16 | 中国矿业大学 | Thermal insulation testing process and apparatus for simulating coal spontaneous combustion procedure |
| CN201458098U (en) * | 2009-06-10 | 2010-05-12 | 煤炭科学研究总院 | Pulverized coal warehouse |
| WO2012003542A1 (en) * | 2010-07-07 | 2012-01-12 | Skill Pro Services Pty Ltd | Flame or explosion suppressant for combustible dust |
| CN102410552A (en) * | 2011-09-21 | 2012-04-11 | 西安交通大学 | Large-scale centralized preparation system for pulverized coal and distribution method |
| JP2014104395A (en) * | 2012-11-26 | 2014-06-09 | Hyuga Seirensho:Kk | System and method for preventing coal dust firing in pulverized coal mill equipment |
Non-Patent Citations (3)
| Title |
|---|
| CAO WEIGUO 等: "2012 International Symposium on Safety Science and Technology Research on characteristic parameters of coal-dust explosion", 《PROCEDIA ENGINEERING》 * |
| 王荣荣 等: "氮气在磨煤系统中的作用", 《河北化工》 * |
| 苏丹 等: "运用本质安全原理预防煤粉爆炸", 《中国安全科学学报》 * |
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