KR20170035423A - Spontaneous combustion inhibitor and method of preventing spontaneous combustion using the same - Google Patents
Spontaneous combustion inhibitor and method of preventing spontaneous combustion using the same Download PDFInfo
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- KR20170035423A KR20170035423A KR1020150134168A KR20150134168A KR20170035423A KR 20170035423 A KR20170035423 A KR 20170035423A KR 1020150134168 A KR1020150134168 A KR 1020150134168A KR 20150134168 A KR20150134168 A KR 20150134168A KR 20170035423 A KR20170035423 A KR 20170035423A
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- fly ash
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2230/00—Function and purpose of a components of a fuel or the composition as a whole
- C10L2230/08—Inhibitors
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
One embodiment of the present invention relates to a spontaneous ignition inhibitor including a fly ash fly ash, a vegetable residual oil and an asphalt, and a method for preventing spontaneous ignition using the same. Accordingly, the present invention can prevent spontaneous ignition of low-fuels, recycle industrial wastes, realize excellent heat insulation effect after application to low-fuels, and can provide storage stability for a long period of time and reduce environmental pollution And can prevent the loss of the heat of the fuel, and a method of preventing low self-ignition using the same.
Description
The present invention relates to a spontaneous ignition inhibitor and a method for preventing spontaneous ignition using the same.
Coal has advantages such as abundant reserves, low price, and stability of supply, and is used as a raw material for thermal power generation. As the proportion of power generation using coal increases, imports of coal are increasing. Especially, imports of low rank coal, which is cheap in price, are increasing significantly.
Generally, a 500 MW standard coal-fired power plant uses carbon fuel after a low-carbon combustion for one to three months, and spontaneous combustion occurs frequently at about 8,000 to 10,000 cycles per year. The spontaneous ignition phenomenon not only causes the loss of the heat loss of the coal (loss rate is about 5.85% or less) but also the risk of large scale damage of the equipment such as dust explosion in the fire and the differentiator system in the transportation process using the conveyor belt is high, The fumes and the harmful gases generated by the fumes may deteriorate the working environment in the low firing and may cause complaints in the surrounding area. In addition, in the process of extinguishing spontaneous ignition, the transfer of coal and the combustion failure may occur due to the water sprayed.
On the other hand, in recent coal-fired power plants, high-grade coal having a high water content and a high-volatile content is mixed and burned in a large amount. In the case of a coal having a low water content and a high water content, high volatility and a large amount of water evaporate, , The reactivity with oxygen is high and the possibility of spontaneous ignition is very high.
In addition, low grade coal has a high concentration of oxygen functional groups (C = O, OH, OC = O) and a hydrophilic surface. These oxygen functional groups have free electrons that can donor (Such as moisture and oxygen in the air) to be adsorbed and denatured as a stable compound.
Therefore, low grade coal such as bituminous coal and lignite has a high incidence of spontaneous ignition due to adsorption and exothermic reaction of oxygen and moisture in the atmosphere. In the past, there has been known a method for preventing spontaneous ignition by spraying a duster with a dispersant using an agent for cement hardening. However, such a conventional method is liable to be desorbed by rainfall and strong wind, and is hydrophilic, which not only causes water penetration but also causes combustion failure.
Accordingly, in order to prevent the spontaneous ignition of low carbon coal, it is necessary to solve problems (rainfall and strong wind desorption, re-scattering and combustion trouble) which have been used before, to minimize the combustion by-products when burned together with coal, There is a growing demand for the development of new spontaneous ignition preventing agents and methods for preventing spontaneous ignition which are not burdensome to the equipment.
It is an object of the present invention to provide a method for preventing spontaneous ignition of low-fuels, recycling of industrial wastes, application of low-fuels, excellent insulation effect, storage stability and storage for a long period of time, And a method for preventing spontaneous ignition using the same.
One embodiment of the present invention relates to an autoignition inhibitor comprising an alumina fly ash, vegetable oil residues and asphalt.
The finely divided fly ash has a content of unburned carbon of 5 wt% to 25 wt% and may include fly ash.
The fly ash may have a loss on ignition of 5% to 25%.
The vegetable oil may include one or more of PFAD (Palm Fatty Acid Distillate) and PAO (Palm Acid Oil).
The asphalt may have a melting point of 170 ° C to 220 ° C.
The weight ratio of the bituminous fly ash: vegetable oil residue: asphalt of the spontaneous ignition stabilizer may be 3 to 7: 3 to 6: 1 to 3.
The spontaneous ignition inhibitor may include 30 to 70% by weight of finely divided fly ash, 20 to 60% by weight of vegetable residual oil and 10 to 30% by weight of asphalt.
Another embodiment of the present invention relates to a method for producing an anti-spontaneous ignition agent comprising liquidifying vegetable residual oil and mixing it with asphalt to prepare a vegetable residue oil-asphalt mixture, and then mixing and stirring the mixture and the finely divided fly ash .
The liquefaction comprises heating the vegetable residue oil at 50 DEG C to 200 DEG C, and the mixing and stirring may include stirring at a speed of 50 RPM to 300 RPM.
Another embodiment of the present invention is a method for producing a coal tar pellet by spraying the aforementioned spontaneous ignition inhibitor on the surface of a coal tar of an underfired coal to form a heat insulating barrier layer for preventing contact between the coal tar and outside air, And a method for preventing ignition.
The present invention can prevent spontaneous ignition of low-fuels, recycle industrial wastes, realize excellent thermal insulation effect after application to low-fuels, and is excellent in storage stability so that it can be stored outside for a long period of time. A spontaneous ignition preventing agent capable of preventing the loss of heat and a method of preventing low spontaneous ignition using the same can be provided.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a graph showing the results of evaluating the spontaneous ignition inhibition of the spontaneous ignition inhibitor of Example 1 of the present invention. Fig.
2 is a photograph of spraying a spontaneous ignition inhibitor according to one embodiment of the present invention.
One embodiment of the present invention relates to an autoignition inhibitor comprising an alumina fly ash, vegetable oil residues and asphalt. Through this, it is possible to prevent spontaneous ignition of low-fuels, recycle industrial wastes, realize excellent insulation effect after application to low-fuels, and have excellent storage stability, which enables long-term storage outside, A spontaneous ignition preventing agent capable of preventing the loss of heat and a method of preventing low spontaneous ignition using the same can be provided.
In addition, the spontaneous ignition inhibitor of the embodiment is applied to the surface of the coal pile at low till to form a heat insulating layer. This not only realizes the spontaneous ignition prevention property and the heat insulating property but also has an effect of preventing desorption due to rainfall and strong wind, smell of odor, fine droplets, dust generation, combustion trouble, and the like.
The spontaneous ignition inhibitor of one embodiment includes an alumina fly ash. The above-mentioned fly ash fly ash is a fine particle made by cooling a coal ash at a high temperature in a facility such as a thermal power plant and cooling the remaining ash, and is generally treated as waste. Accordingly, the spontaneous ignition inhibitor of the embodiment has an excellent effect of reducing the cost by recycling the waste, preventing spontaneous ignition of low coarse coal, and acting as a heat insulating layer preventing contact between the coarse coal and the external environment.
The finely divided fly ash may have an unburned carbon content of 5 wt% to 25 wt%. In this case, the spontaneous ignition agent can be applied to a coal pile at a low level of firing, and can realize an excellent thermal insulation effect, and at the same time, it can be used for burning together with the field coal to recover the fuel loss. As a result, the spontaneous ignition inhibitor can prevent deterioration due to the storage stability and variable environment of the coal pile, realize excellent spontaneous ignition prevention performance, and further improve the energy efficiency at night coal combustion. Further, by using the fine fly fly ash having the above unburned carbon content range, it is possible to pass the REC (Renewable Energy Certificate) certification.
The finely divided fly ash may include fly ash. The fly ash may have a loss on ignition of 5% to 25%. It is possible to further increase the heat insulating effect of the spontaneous ignition preventing agent in the ignition loss range, to reduce the amount of the volatile organic compound generated upon application to the coal pile, to improve the stability of the spontaneous ignition preventing composition, It is possible to further improve the prevention effect.
The spontaneous ignition agent of one embodiment includes vegetable residue oil. These vegetable residues control the viscosity of the anti-spontaneous agent so as to form a formulation that can be applied or sprayed, and at the same time, improve the adhesion to the surface of the coal pile, thereby forming a layer without being flowed.
The vegetable oil may include one or more of PFAD (Palm Fatty Acid Distillate) and PAO (Palm Acid Oil). In this case, the spontaneous ignition agent can pass the REC (Renewable Energy Certificate) certification, and the raw material supply and demand can be facilitated, thereby improving the economical efficiency.
In the case of using the vegetable residual oil mentioned above, the anti-spontaneous agent is present as a solid at room temperature (20 ° C to 25 ° C) and can be easily liquidized. In this case, the spontaneous ignition preventing agent is excellent in the characteristics of being produced in the liquid state and in the liquid state, and after being coated on the surface of the coal pile, the property of solidifying and forming the heat insulating layer can be improved.
The autoignition inhibitor of one embodiment includes asphalt. Such asphalt acts to control the viscosity of the anti-spontaneous agent and to cure the anti-spontaneous agent after adhering to the surface of the coal pile to form a heat insulating layer.
The asphalt may have a melting point of 70 ° C to 220 ° C. In this case, the spontaneous ignition inhibitor may exist as a solid at room temperature (20 ° C to 25 ° C) and may be easily liquidized. In this case, the spontaneous ignition preventing agent is excellent in the characteristics of being produced in the liquid state and in the liquid state, and after being coated on the surface of the coal pile, the property of solidifying and forming the heat insulating layer can be improved.
In one embodiment, the spontaneous ignition inhibitor may include 30 to 70% by weight of finely divided fly ash, 20 to 60% by weight of vegetable residual oil, and 10 to 30% by weight of asphalt.
The weight ratio of the bituminous fly ash: vegetable oil residue: asphalt of the spontaneous ignition stabilizer may be 3 to 7: 3 to 6: 1 to 3.
In the above content and weight ratio range, the spontaneous ignition inhibitor is excellent in the effect of preventing spontaneous ignition, has an excellent adiabatic effect, and can improve the recovery of fuel loss and the effect of reducing waste.
Another embodiment of the present invention relates to a method for producing an autoignition inhibitor, which comprises liquidifying vegetable residue oil and mixing the same with asphalt to prepare a vegetable residue oil-asphalt mixture, followed by mixing and stirring the mixture and the finely divided fly ash.
Method for manufacturing a spontaneous ignition inhibitor of one embodiment First, a solid state vegetable residue oil is injected into a mixing / storage tank, and the mixing / storage tank is heated to liquidify vegetable residue oil by making it into a liquid state. Then, the mixing / storage tank asphalt is injected and mixed with liquid vegetable oil to prepare a vegetable oil-asphalt mixture. Thereafter, an alumina fly ash is injected into the mixing / storage tank, and the alumina fly ash and the vegetable residue oil-asphalt mixture are mixed and stirred to prepare a natural anti-fire agent.
The liquefaction may comprise heating the vegetable residue oil at 50 ° C to 200 ° C. In this case, there is an advantageous effect of realizing the characteristic of forming the heat insulating layer by solidifying after the natural spark inhibitor is applied to the surface of the coal pile, and then it is advantageous to liquidify the natural spark inhibitor at room temperature or the manufacturing process temperature.
The mixing agitation may include stirring at a speed of 50 RPM to 300 RPM. In this case, the stability of the production process is excellent, the productivity is high, the bubble generation rate of the autoignition inhibitor is reduced, and the formulation stability and the like can be improved.
Another embodiment of the present invention is a method for producing a low-carbon spontaneous ignition product, which comprises the step of spraying the above-mentioned spontaneous ignition inhibitor onto the surface of a coal tar pile to form a heat insulating barrier layer for preventing contact between coal pile and outside air, [0002]
In one embodiment, the method for preventing spontaneous ignition of low carbon is applied by spraying the spontaneous ignition preventing agent including the above-mentioned fine fly fly ash, vegetable residual oil and asphalt onto the surface of the coal fleece. Through this, it is possible to prevent spontaneous ignition of low-fuels, to recycle industrial wastes, to achieve excellent thermal insulation effect after application to low-fuels, and to be able to store outside for a long time due to excellent storage stability, A spontaneous ignition preventing agent capable of preventing the loss of heat and a method of preventing low spontaneous ignition using the same can be provided.
The method of preventing low-self-ignition spontaneously forms a solid insulation layer by applying the spontaneous ignition inhibitor to the surface of a coal pile in a low-freeness manner. Thus, the low-intrinsic spontaneous ignition prevention method not only realizes the spontaneous ignition prevention property and the heat insulation property, but also can prevent the desorption due to rainfall and strong wind, the odor smell, the fine droplets, the dust generation, and the combustion trouble.
Example
Hereinafter, the present invention will be described in detail with reference to examples and comparative examples. It should be understood, however, that these examples are provided for illustration only and are not intended to limit the scope of the present invention.
Example One
20 parts by weight of PFAD and 10 parts by weight of asphalt were charged into a mixing / storage tank and heated to a temperature of about 50 to 200 占 폚. PFAD and asphalt were changed from a solid phase to a liquid phase and were mixed with each other. Then, 70 parts by weight of Donghae fly ash having a gross content of 5% was added and mixed to prepare an anti-spontaneous flame retardant. The mixing / storage tank was maintained at a temperature in the range of 50 to 200 ° C so that the spontaneous ignition inhibitor could be sprayed later.
Comparative Example One
A spontaneous ignition preventing agent was prepared in the same manner as in Example 1, except that the fly ash fly ash having a content of stearic acid was 4.5% instead of the fly ash fly ash.
Comparative Example 2
A spontaneous ignition inhibitor was prepared in the same manner as in Example 1, except that paraffin wax was used instead of asphalt.
Comparative Example 3
A spontaneous ignition inhibitor was prepared in the same manner as in Example 1 except that ascon was used instead of asphalt.
≪ Evaluation of curing characteristics and applicability >
For the evaluation of the curing characteristics, a coal file prepared in a similar form to that of a 500 MW standard coal-fired power plant was prepared. The coal piles were formed by stacking 200 kg of granules having a particle size of 50 mm.
The spontaneous ignition inhibitor prepared in Example 1 and Comparative Examples 1 and 2 was applied to the top of a coal pile under the same conditions and left for 3 hours. The degree of curing property was visually observed, The applicability was evaluated.
1) Curing characteristics evaluation criteria
Suitability: A solid anti-sparking agent layer was formed on the surface of the coal pile.
Incompatible: Part of the liquid anti-sparking agent exists on the surface of the coal pile, and it is difficult to maintain the layer because it is not solidified.
2) Actual operating applicability criterion
Conformity: No obstacles were encountered in the transfer of coal files and in the utilization of facilities.
Incompatibility: An obstacle has occurred in transferring coal files or in using facilities.
As can be seen from the above Table 1, the spontaneous ignition inhibitor of Example 1 was excellent in the curing property of forming a solid heat insulating layer on the surface of the coal pile. Comparative Example 1 also exhibited excellent curing properties for forming a solid heat insulating layer. However, since it contains a fly ash fly ash, the fuel loss recovery effect of the same level as in Example 1 could not be realized.
On the other hand, in Comparative Example 2 using paraffin wax other than asphalt, it was confirmed that an adiabatic layer could not be formed due to inadequate curing characteristics.
However, in Comparative Example 3 containing ascon in addition to asphalt, the curing property was excellent, but the hardness was too high, which made it difficult to transfer the coal pile to the furnace, and the uncoating agent remained in the storage container after curing It was found that the spray nozzle was clogged and the storage container could not be used at the time of evaluation of the curing characteristics, making it difficult to use it for actual operation.
<Natural ignition Preventiveness Evaluation>
For evaluation of spontaneous ignition, a coal file prepared in a similar form to that of a 500 MW standard coal-fired power plant was prepared. The coal piles were formed by stacking 200 kg of granules having a particle size of 50 mm.
The spontaneous ignition inhibitor of Example 1 was coated on top of a coal pile and left for 3 hours. After that, the extent of heat accumulation and ignition inside the coal was monitored according to the atmospheric temperature and humidity (after application).
In addition, coal piles of the same conditions without the addition of the spontaneous ignition inhibitor were left for 3 hours, and the degree of heat accumulation and ignition inside the coal was monitored according to the atmospheric temperature and humidity (before application).
Generally, spontaneous ignition occurs mostly in the range of 1 ~ 2m from the surface layer of coal pile, which is likely to come into contact with outside air and moisture. Therefore, the spontaneous ignition evaluation monitoring is performed to measure the temperature change of the upper end of the coal pile. The monitoring results are shown in FIG. 1 divided into results before application and after application.
As can be seen from the results shown in Fig. 1, the coal pile (after application) coated with the anti-spontaneous agent of Example 1 of the present invention exhibited an adiabatic characteristic as compared with the coal pile And the temperature variation range was small, and it was found that the ignition start temperature was not reached. As a result, it was confirmed that the spontaneous ignition inhibitor of Example 1 of the present invention realizes excellent spontaneous ignition prevention characteristics.
Claims (10)
Wherein the finely divided fly ash contains 5 wt% to 25 wt% of unburned carbon, and contains fly ash.
Wherein the fly ash has a loss on ignition of 5% to 25%.
Wherein the vegetable residue oil comprises at least one of PFAD (Palm Fatty Acid Distillate) and PAO (Palm Acid Oil).
Wherein the asphalt has a melting point of from 170 캜 to 220 캜.
Wherein the weight ratio of the bituminous coal fly ash, vegetable bituminous oil and asphalt is in the range of 3 to 7: 3 to 6: 1 to 3:
Wherein the spontaneous ignition inhibitor comprises 30 to 70% by weight of finely divided fly ash, 20 to 60% by weight of vegetable residual oil and 10 to 30% by weight of asphalt.
Wherein the liquefaction comprises heating the vegetable residue oil at 50 DEG C to 200 DEG C, and the mixing and stirring is performed at a speed of 50 RPM to 300 RPM.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200062832A (en) * | 2018-11-27 | 2020-06-04 | 한국전력공사 | Spontaneous combustion method and the inhibitor manufactured using high molecular resin additive |
| WO2020149584A1 (en) * | 2019-01-16 | 2020-07-23 | 주식회사 미산알앤씨 | Multi-functional foam concentrate-type agent for inhibiting spontaneous ignition of soft coal |
| KR102301244B1 (en) | 2021-03-29 | 2021-09-10 | 주식회사 블루오션에코 | Spontaneous combustion inhibitor of coal and method for inhibiting spontaneous combustion of coal using the same |
| KR20230026867A (en) | 2021-08-18 | 2023-02-27 | 황성규 | Spontaneous combustion inhibitor of coal |
| KR20230162848A (en) | 2022-05-19 | 2023-11-29 | 한국전력공사 | Manufacturing system of anti-spontaneous combustion agent for coal using a ultrasonic wave, and manufacturing method thereof, and anti-spontaneous combustion agent for coal manufactured by same |
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| KR20200142263A (en) | 2019-06-12 | 2020-12-22 | 한국에너지기술연구원 | Method and Apparatus for Injecting Slurry for Fire Extinguishment and Repressing Spontaneous Combustion in Coal Stockpiles |
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| KR20130074442A (en) * | 2011-12-26 | 2013-07-04 | 한국중부발전(주) | Anti-spontaneous combustion agent for coal and anti-spontaneous combustion method using it |
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| JP2013525536A (en) * | 2010-04-21 | 2013-06-20 | 韓国エネルギー技術研究院 | Method for producing solid fuel in which binder material and carbon source are mixed, and solid fuel produced by the method |
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| KR20200062832A (en) * | 2018-11-27 | 2020-06-04 | 한국전력공사 | Spontaneous combustion method and the inhibitor manufactured using high molecular resin additive |
| WO2020149584A1 (en) * | 2019-01-16 | 2020-07-23 | 주식회사 미산알앤씨 | Multi-functional foam concentrate-type agent for inhibiting spontaneous ignition of soft coal |
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| CN111440650B (en) * | 2019-01-16 | 2021-07-20 | 米山E&C株式会社 | Foam liquid form multifunctional spontaneous combustion inhibitor for bituminous coal |
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| KR102301244B1 (en) | 2021-03-29 | 2021-09-10 | 주식회사 블루오션에코 | Spontaneous combustion inhibitor of coal and method for inhibiting spontaneous combustion of coal using the same |
| KR20230026867A (en) | 2021-08-18 | 2023-02-27 | 황성규 | Spontaneous combustion inhibitor of coal |
| KR20230162848A (en) | 2022-05-19 | 2023-11-29 | 한국전력공사 | Manufacturing system of anti-spontaneous combustion agent for coal using a ultrasonic wave, and manufacturing method thereof, and anti-spontaneous combustion agent for coal manufactured by same |
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