CN104232239A - Method of preparing flame retardant from emulsified crude oil to prevent coal pile from spontaneous combustion - Google Patents
Method of preparing flame retardant from emulsified crude oil to prevent coal pile from spontaneous combustion Download PDFInfo
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- CN104232239A CN104232239A CN201410310834.2A CN201410310834A CN104232239A CN 104232239 A CN104232239 A CN 104232239A CN 201410310834 A CN201410310834 A CN 201410310834A CN 104232239 A CN104232239 A CN 104232239A
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Abstract
The invention discloses a method of forming a flame retardant by bonding emulsified crude oil with pulverized coal. The method is used for achieving purposes of weakening inside oxidization reaction and delaying spontaneous combustion ignition by covering the surface of a coal pile to isolate the coal pile from ambient air. The flame retardant consists of the following components in parts by weight: 55-68 parts of pulverized raw coal with the grain size smaller than 2mm, 5-15 parts of crude oil, 25-35 parts of water and 0.5-1.5 parts of a dispersing agent. According to the method disclosed by the invention, after the flame retardant on the surface of the coal pile is formed into a shell, the coal pile can be guaranteed not to spontaneously combust within 130 days. Compared with the uncovered coal pile, the flame retardant can be used for obviously lowering the internal temperature of the coal pile, is free of harmful effect for the operating conditions of a boiler, capable of preventing the coal pile from wind damage and rain damage, reducing stored coal loss and preventing environmental pollution. The method is especially suitable for applying mechanical spraying on a great coal pile with height of over 4m.
Description
Technical field
The present invention relates to a kind of method preventing self-ignition of coal pile, be specifically related to a kind of employing and be mixed with emulsified crude oil and coal dust the method that fire retardant prevents self-ignition of coal pile.
Background technology
In the process of coal actual production, transport, storage and utilization, such as in colliery, the outdoor dump of power plant, leave the dump in carrying case in oceangoing vessel and railway transport course in, all usually dieseling occur.According to statistics, China every year nearly 56% state-owned coal mines there is the danger of spontaneous combustion of coal, add the spontaneous combustion that coal occurs in transportation, all therefore country suffers huge economy and resources loss every year, and the spontaneous combustion of coal simultaneously also can bring serious environmental pollution.
The spontaneous combustion of coal is the process that chemical reaction in an extremely complicated porous medium and heat transfer, mass transfer are coupled, and is determined by the external conditions acting in conjunction such as tightness degree of the multiple internal factor such as chemical composition, space structure, physicals of coal and oxygen supply, heat radiation, accumulation.It is generally acknowledged, coal contacts the low temperature oxidization process caused with oxygen in air be topmost reason, therefore, by controlling the oxygen amount being entered coal body inside by dump border, reaches the object suppressing self-ignition of coal pile phenomenon.Be the fine and close tectum that main raw material is aided with a small amount of crude oil at dump surface coverage one deck with coal, by the air insulated in dump and environment, weaken the oxidizing reaction of its inside, make to cause the low-temperature oxidation of dump generation dieseling to react can not continue to carry out, thus the temperature rise rate of dump slows down, reach the object postponing nature and catch fire.
At present, have Small angle coal piling, compacting for the physical method that dump is fire-retardant, watering etc., large owing to there is dump floor space, the reasons such as the high and flame retardant effect of working strength is not good, people adopt wish not high.Chemical additive kind such as amine salt stopping agent and polymer emulsion stopping agent on the market, expensive, usage quantity is large, and protection effect is undesirable, and some is also harmful to combustion processes subsequently or produce and pollute, and produce corrosion to equipment, promoted extension is restricted.Water mortar cladding process has certain economy, but when dump is used for hearth combustion due to the non-inflammability of water mortar, reduces the combustion heat value of fuel.The porosity that coal dust cladding process is certain because coal dust has, isolated air effect is relatively poor, and pulverized coal consumption is comparatively large, and construction exists inconvenience.
Summary of the invention
Technical problem to be solved by this invention, just be to provide a kind of employing and be mixed with emulsified crude oil and coal dust the method that fire retardant prevents self-ignition of coal pile, method good flame retardation effect of the present invention, safety, environmental protection, and corrosion can not be produced to boiler combustion equipment, detrimentally affect is not produced to boiler operatiopn operating mode, also have aspect with low cost construction to be suitable for the feature promoted.
Solve the problems of the technologies described above, the technical solution used in the present invention is:
Adopt and prepare with emulsified crude oil the method that fire retardant prevents self-ignition of coal pile, it is characterized in that: the component of described fire retardant and weight proportion are: coal dust 55-68, crude oil 5-15, water 25-35, dispersion agent 0.5--1.5;
Described method comprises the following steps:
The coal dust raw material of described fire retardant is layered on dump surface, and the coal dust thickness of covering is 5-10mm;
Configuration emulsion: added by the crude oil of described fire retardant in the container filling described point water gaging, then add described dispersion agent, high-speed stirring forms homogeneous solution under normal pressure and temperature;
Finally emulsion is evenly sprayed at dump coal dust layer on the surface, after drying, forms comparatively hard shell body.
The kinematic viscosity of described crude oil under 50 DEG C of conditions is less than 1863.0mm
2/ s, the density under 20 DEG C of conditions is less than 990.3kg/m
3; Described coal dust is the bituminous coal that granularity is less than 2mm;
Described dispersion agent be Sodium dodecylbenzene sulfonate, sulfonated petro-leum, sulfonated humic acid sodium or benzyl how sulfonic formaldehyde condensation compound one of them.
It is high at the large dump of more than 4m that the present invention is applicable to dump heap, and implement machinery sprinkling.
The present invention develops a kind of with emulsified crude oil bonding coal dust formation fire retardant, dump and ambient air is isolated, to weaken the oxidizing reaction of its inside, reach the object postponing involuntary ignition by dump surface coverage.Emulsified crude oil contains complicated high molecular polymer and dispersion agent, utilizing the space steric effect of macromolecular chain and the special lypohydrophilic character of tensio-active agent that itself and coal grain can be made closely to form comparatively hard coat stops oxygen to enter dump, thus delays or stop the low-temperature oxidation of dump to react the object reaching prevention self-ignition of coal pile.
Advantage of the present invention and positively effect are:
(1), after flame retardant layer is formed, not spontaneous combustion in dump 130 days can be ensured;
(2) with do not cover compared with dump, flame retardant layer can obviously reduce dump internal temperature;
(3) fire retardant does not produce detrimentally affect to boiler operatiopn operating mode.
(4) flame retardant layer can prevent dump windage loss rain from damaging, and reduces coal storage loss, can effectively prevent the pollution of the environment;
(5) present method is especially suitable for piling and highly implements machinery at the large dump of more than 4m and spray.
Embodiment
Employing of the present invention prevents the embodiment of the method one of self-ignition of coal pile with the fire retardant that emulsified crude oil and coal dust are mixed with, and comprises the following steps:
First the coal dust raw material of described fire retardant is layered on dump surface, the coal dust thickness of covering is 5-10mm;
Then configure emulsion: added in the container of the water filling described component by the crude oil of described fire retardant below, then add described dispersion agent, under normal pressure and temperature, high-speed stirring forms homogeneous solution;
Finally emulsion is evenly sprayed at dump coal dust layer on the surface, after drying, forms comparatively hard shell body.
It is high at the large dump of more than 4m that the present invention is applicable to dump heap, and implement machinery sprinkling.
The component of fire retardant and weight proportion are:
Granularity is less than the pulverized bituminous coal 55 of 2mm, and the kinematic viscosity under 50 DEG C of conditions is less than 3726.0mm
2/ s, density under 20 DEG C of conditions are less than 990.3kg/m
3crude oil 5, water 25, dispersion agent Sodium dodecylbenzene sulfonate 0.5.
Embodiment two, method steps, and the kinematic viscosity of crude oil under 50 DEG C of conditions and the density under 20 DEG C of conditions are with embodiment one, the component of a fire retardant and weight proportion are: coal dust 68, crude oil 15, water 35, dispersion agent 1.5.
Embodiment three, method steps, and the kinematic viscosity of crude oil under 50 DEG C of conditions and the density under 20 DEG C of conditions are with embodiment one, the component of a fire retardant and weight proportion are: coal dust 61.5, crude oil 10, water 30, dispersion agent 1.
Embodiment four, method steps, and the kinematic viscosity of crude oil under 50 DEG C of conditions and the density under 20 DEG C of conditions are with embodiment one, the component of a fire retardant and weight proportion are: coal dust 55, crude oil 15, water 25, dispersion agent 1.5.
Embodiment five, method steps, and the kinematic viscosity of crude oil under 50 DEG C of conditions and the density under 20 DEG C of conditions are with embodiment one, the component of a fire retardant and weight proportion are: coal dust 68, crude oil 5, water 35, dispersion agent 0.5.
Embodiment six, method steps, and the kinematic viscosity of crude oil under 50 DEG C of conditions and the density under 20 DEG C of conditions are with embodiment one, the component of a fire retardant and weight proportion are: coal dust 68, crude oil 15, water 25, dispersion agent 0.5.
Comparative example
At adjacent two same sizes, pile up on the identical dump of shape and carry out simultaneous test.One of them dump is taked flame-retarding means, and another one does not take the dump of flame-retarding means as reference.Test coal is high volatile raw coal, and 40m × 40m bottom dump, center line average is 8.0m.
First pulverized by coal cinder with crusher, sieve, obtain being less than 2mm fine coal, take 97627kg coal dust sample, uniform spreading is on dump surface.Prepare emulsifying agent again: add 31631kg water in a reservoir, 11715 crude oil, 1172kg dispersion agent, be uniformly mixed uniformly slurry at normal temperatures and pressures, with spraying vehicle, it is evenly sprayed at above-mentioned dump surface, after drying, forms duricrust.Through test in 130 days, do not cover fire retardant dump and spontaneous combustion on fire occurs, cover fire retardant dump and spontaneous combustion does not occur; Covering fire retardant dump internal temperature is starkly lower than and does not cover fire retardant dump corresponding temperature.Period, housing remained intact through the test of typhoon heavy rain.
The present invention adopts the near coal-based fire retardant of thermal conductivity and coal facies to cover dump surface, suppresses air to enter dump inside, slows down the low-temperature oxidation speed of reaction of coal, reach the object of suppression self-ignition of coal pile.
Claims (3)
1. adopt and prepare with emulsified crude oil the method that fire retardant prevents self-ignition of coal pile, it is characterized in that: the component of described fire retardant and weight proportion are: coal dust 55-68, crude oil 5-15, water 25-35, dispersion agent 0.5--1.5;
Described method comprises the following steps:
First the coal dust raw material of described fire retardant paving is sprinkled upon dump surface, the coal dust thickness of covering is 5-10mm; Then emulsion is configured: added by the crude oil of described fire retardant in the container filling described point water gaging, then add described dispersion agent, high-speed stirring forms homogeneous solution under normal pressure and temperature; Finally emulsion is evenly sprayed at dump coal dust layer on the surface, after drying, forms comparatively hard shell body.
2. employing according to claim 1 prepares with emulsified crude oil the method that fire retardant prevents self-ignition of coal pile, it is characterized in that: the kinematic viscosity of described crude oil under 50 DEG C of conditions is less than 1863.0mm
2/ s, the density under 20 DEG C of conditions is less than 990.3kg/m
3; Described coal dust is the bituminous coal that granularity is less than 2mm; Described dispersion agent be sulfonated petro-leum, Sodium dodecylbenzene sulfonate, sulfonated humic acid sodium or benzyl how sulfonic formaldehyde condensation compound one of them.
3. employing according to claim 1 and 2 prepares with emulsified crude oil the method that fire retardant prevents self-ignition of coal pile, it is characterized in that: it is high at the large dump of more than 4m that the present invention is applicable to dump heap, and implement machinery sprinkling.
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| CN201410310834.2A CN104232239B (en) | 2014-07-01 | 2014-07-01 | Method of preparing flame retardant from emulsified crude oil to prevent coal pile from spontaneous combustion |
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| CN201410310834.2A CN104232239B (en) | 2014-07-01 | 2014-07-01 | Method of preparing flame retardant from emulsified crude oil to prevent coal pile from spontaneous combustion |
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| CN104232239B CN104232239B (en) | 2017-01-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106118795A (en) * | 2016-06-25 | 2016-11-16 | 陈毅忠 | A kind of preparation method preventing spontaneous combustionof coal to be combined retardant |
| CN108137234A (en) * | 2015-08-28 | 2018-06-08 | 宇部兴产株式会社 | The method for storing coal measures system and storage coal |
| CN115109601A (en) * | 2022-06-30 | 2022-09-27 | 广东电网有限责任公司 | Environment-friendly flame retardant and preparation method and application thereof |
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| US4828576A (en) * | 1985-11-15 | 1989-05-09 | Mobil Oil Corporation | Drying low rank coal and retarding spontaneous ignition |
| JP2000297288A (en) * | 1999-04-15 | 2000-10-24 | Jgc Corp | Prevention of spontaneous combustion of coal and coal subjected to prevention treatment of spontaneous combustion |
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Patent Citations (4)
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| EP0010889A1 (en) * | 1978-10-23 | 1980-05-14 | Conoco Phillips Company | Composition for treating particulate hydrocarbon fuel, and fuel treated therewith |
| US4828576A (en) * | 1985-11-15 | 1989-05-09 | Mobil Oil Corporation | Drying low rank coal and retarding spontaneous ignition |
| JP2000297288A (en) * | 1999-04-15 | 2000-10-24 | Jgc Corp | Prevention of spontaneous combustion of coal and coal subjected to prevention treatment of spontaneous combustion |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108137234A (en) * | 2015-08-28 | 2018-06-08 | 宇部兴产株式会社 | The method for storing coal measures system and storage coal |
| CN106118795A (en) * | 2016-06-25 | 2016-11-16 | 陈毅忠 | A kind of preparation method preventing spontaneous combustionof coal to be combined retardant |
| CN106118795B (en) * | 2016-06-25 | 2018-11-06 | 唐钢美锦（唐山）煤化工有限公司 | A kind of preparation method preventing the compound retardant of spontaneous combustionof coal |
| CN115109601A (en) * | 2022-06-30 | 2022-09-27 | 广东电网有限责任公司 | Environment-friendly flame retardant and preparation method and application thereof |
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| CN104232239B (en) | 2017-01-25 |
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Address after: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |