阅读说明：本技术 泡沫液形态的多功能烟煤用自发燃烧抑制剂 (Foam liquid form multifunctional spontaneous combustion inhibitor for bituminous coal ) 是由 具宰贤 全鸿彻 文圣 李光熙 吴成基 于 2019-12-06 设计创作，主要内容包括：本发明涉及一种泡沫液形态的多功能烟煤用自发燃烧抑制剂,其抑制烟煤的自发燃烧的同时可以防止飞散,据此可以预防由自发燃烧导致的发电厂工作障碍、烟煤浪费、恶臭产生等问题,因使用低廉的烟煤而可以经济、安全、环保地运营烟煤发电厂,通过改善流动点而可以在零下20度使用。本发明的特征在于,利用抗氧化剂、挥发物活性化抑制剂、乳化剂化合物以水溶性的泡沫液形态制成自发燃烧抑制剂,将制成为水溶性的泡沫液形态的自发燃烧抑制剂和水及空气混合,以发泡形态分散及涂覆于烟煤。(The present invention relates to a spontaneous combustion inhibitor for bituminous coal in the form of a foam liquid, which inhibits spontaneous combustion of bituminous coal and prevents scattering, thereby preventing problems such as operational failure of a power plant, waste of bituminous coal, and generation of offensive odor caused by spontaneous combustion, and which can economically, safely, and environmentally operate a bituminous coal power plant by using low-cost bituminous coal and can be used at-20 ℃ by improving the flow point. The present invention is characterized in that a spontaneous combustion inhibitor is prepared in the form of a water-soluble foam solution by using an antioxidant, a volatile activation inhibitor and an emulsifier compound, and the spontaneous combustion inhibitor prepared in the form of the water-soluble foam solution is mixed with water and air and dispersed and coated on bituminous coal in the form of foam.)

1. A spontaneous combustion inhibitor for bituminous coal in the form of foam liquid is prepared through preparing foam liquid, spraying it with water and air, dispersing it in foam state and coating it on bituminous coal,

the spontaneous combustion inhibitor is prepared by mixing 7-13 wt% of an antioxidant, 20-40 wt% of a volatile activation inhibitor, 20-40 wt% of an emulsifier compound, and 20-40 wt% of water.

2. The foam concentrate form multifunctional bituminous coal according to claim 1, wherein,

to 4 wt% of the spontaneous combustion inhibitor prepared in the form of a foam solution, 96 wt% of water mixed with air was mixed, and bituminous coal was dispersed and coated in the form of foam.

3. The foam concentrate form multifunctional bituminous coal according to claim 1, wherein,

the antioxidant of the spontaneous combustion inhibitor is composed of phenylenediamine.

4. The foam concentrate form multifunctional bituminous coal according to claim 1, wherein,

the volatile activation inhibitor of the spontaneous combustion inhibitor is composed of methyldiethanolamine.

5. The foam concentrate form multifunctional bituminous coal according to claim 1, wherein,

the emulsifier compound of the spontaneous combustion inhibitor is composed of 25 to 40 wt% of diethylene glycol monobutyl ether, 2 to 10 wt% of glycol ether, 3 to 10 wt% of a nonionic surfactant, and 45 to 65 wt% of a castor oil emulsifier.

Technical Field

The present invention relates to a spontaneous combustion inhibitor for bituminous coal, which can prevent problems such as power plant operation failure, bituminous coal waste, and generation of offensive odor caused by spontaneous combustion, and more particularly, to a multifunctional spontaneous combustion inhibitor for bituminous coal in the form of a foam liquid, which is prepared in the form of a water-soluble foam liquid by mixing a surfactant when preparing a spontaneous combustion inhibitor, instead of mixing a surfactant after preparing a spontaneous combustion inhibitor, and uniformly dispersing and coating the mixture in the form of a foam on bituminous coal when spraying, thereby preventing spontaneous combustion and the condition of an indoor coal yard, and contributing to preventing scattering of bituminous coal.

Background

In general, spontaneous combustion of coal is caused by a combination of various factors such as volatile matter, moisture, carbonization degree, oxidation of impurities, and oxygen absorption.

When coal absorbs oxygen in air or water, the volatile matter contained in the coal has a low ignition point, and therefore, the coal is activated and generates heat, thereby spontaneously generating a combustion phenomenon. The smaller the size of the coal particles, the larger the surface area, and the larger the contact area with oxygen, so that spontaneous combustion frequently occurs. Thereby, the oxidation rate increases, and the spontaneous combustion occurrence rate increases.

The longer the coal storage time, the more the oxygen absorption rate of the coal increases and the volatile matter having a low ignition point is activated, so that the internal temperature of the coal pile increases and the possibility of spontaneous combustion increases.

In addition, bituminous coals purchased from power plants and iron and steel plants are transported from the mine in various forms ranging from powder to lump, and therefore, in order to effectively apply the spontaneous combustion inhibitor to the coal, the bituminous coals can be uniformly applied only by spraying the bituminous coals in a foamed form from the top to the bottom at the place where the coals fall down in the conveyor system. Therefore, the spontaneous combustion inhibitor is produced in the form of a foam liquid which can be sprayed in a foamed form after being mixed with water and air, which is the second important factor.

In particular, the volatiles and spontaneous combustion phenomena are in direct proportion. Therefore, bituminous coal with a large amount of volatile matter has a high possibility of spontaneous combustion, and is therefore classified into low grades and traded at a low price.

The bituminous coal contains 10-20% of volatile matters, so most of the bituminous coal has the possibility of spontaneous combustion, and in the case of low-grade carbon, the volatile matters are more and contain 30-40% of volatile matters, so the risk of spontaneous combustion is higher.

Therefore, if spontaneous combustion can be suppressed by suppressing activation of volatile matter and cutting off absorption of oxygen, low-rank bituminous coal can be used to ensure economical and efficient energy. Meanwhile, spontaneous combustion is often accompanied by fire outbreaks in coal storage yards, and therefore, spontaneous combustion suppression technology for preventing such a situation is a technology that is essential for the operation of coal-fired power plants.

Recently, as part of government fine particulate matter control policies, the coal storage yard indoor housing industry of bituminous coal power plants is being carried out, and therefore, prevention of fire caused by spontaneous combustion in an indoor housing coal storage yard is a very important issue in the fire prevention level of the national basic industry.

The cause of spontaneous combustion is that the higher the oxygen concentration, the higher the temperature, the lower the humidity, and the higher the risk of spontaneous combustion in terms of external conditions, and the more volatile matter and the more pulverized coal, the higher the risk of spontaneous combustion in terms of composition conditions.

Looking up accident cases caused by spontaneous combustion, in the process of conveying coal by a conveyor belt, work interruption of a fire power plant occurs in the city of three 38495 in 12 and 10 months in 2015, spontaneous combustion lasts for more than 1 week in the coal storage yard in tang jin city in 2011 and 11 and 2018, residents are greatly inconvenient due to foul smell, and explosion accidents occur in the thermal power plant due to spontaneous combustion in the city of kawa in 8 and 8 months in 2018, so that casualties are caused.

Korean registered patent No. 10-1047515 discloses a low-rank coal upgrading method and a low-rank coal upgrading apparatus for improving the quality of low-rank coal having a high ash content and a high moisture content and suppressing spontaneous combustion.

The prior art low-rank coal upgrading method described above includes a pulverization screening step, a dehydration step, a volatile matter removal step, a coating step, an evaporation removal step, and a forming step.

The crushing and screening step is a step of crushing low-grade coal into fine coal. In other words, the low-rank coal contains fixed carbon powder, ash, and moisture, and the fixed carbon powder is separated from the ash and moisture by pulverizing the low-rank coal. In the pulverizing and screening step, in order to pulverize low-rank coal, an attrition pulverizer is used.

As described above, the prior art relates to a low-rank coal upgrading method and a low-rank coal upgrading apparatus, and is known to be an expensive and complicated process including a pulverizing apparatus, a dewatering apparatus, a separating apparatus, a drying apparatus, a coating apparatus, and the like, in order to upgrade low-rank coal and suppress spontaneous combustion.

The prior art techniques implemented as described above have problems in that the process for upgrading coal and suppressing spontaneous combustion is complicated and the facility cost and maintenance cost are increased, and in particular, a space for installing additional facilities is required.

Further, as yet another recent countermeasure against spontaneous combustion, there is known a method of: the antioxidant is used as a main raw material to develop a spontaneous combustion inhibitor in a non-foam concentrate form, and the spontaneous combustion inhibitor, a surfactant (anti-flying agent) and water are mixed and coated on coal. However, there are inconveniences in that the equipment of the spontaneous combustion inhibitor is corrosive, the high pour point (0 ℃), it is necessary to use it together with a surfactant, the equipment is not economical due to the increase in the use of chemicals, and the like.

Therefore, in order to prevent the spontaneous combustion phenomenon, research into spontaneous combustion inhibitors that can solve the problems of the existing methods or products is increasing.

Prior art documents

Patent document

(patent document 0001) patent document: registration patent No. 10-1047515 (registration date: 2011.07.01)

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a spontaneous combustion suppressant for bituminous coal in a foam liquid form, which is prepared in a water-soluble foam liquid form by mixing a surfactant when preparing a spontaneous combustion suppressant, instead of a method of mixing a surfactant after preparing a spontaneous combustion suppressant, and uniformly dispersing and applying the mixture in a foam form to bituminous coal when spraying, thereby preventing spontaneous combustion, suppressing spontaneous combustion of bituminous coal, and preventing scattering of bituminous coal.

In addition, the present invention provides a spontaneous combustion inhibitor for bituminous coal in the form of a foam liquid, which can prevent problems such as power plant operational failure, bituminous coal waste, generation of offensive odor, and the like, caused by spontaneous combustion, by inhibiting spontaneous combustion of bituminous coal.

In addition, the present invention provides a multifunctional spontaneous combustion inhibitor for bituminous coal in the form of a foam liquid, which inhibits spontaneous combustion of bituminous coal and prevents bituminous coal from scattering, and which can economically, safely and environmentally operate a bituminous coal power plant because of the use of inexpensive bituminous coal.

Further, the present invention provides a multifunctional spontaneous combustion suppressant for bituminous coal in the form of a foam liquid, which can suppress spontaneous combustion of bituminous coal simply and economically.

The present invention also provides a multifunctional spontaneous combustion inhibitor for bituminous coal in the form of a foam liquid, which can be used even at a temperature of-20 ℃ by improving the pour point.

In order to achieve the above object, in the present invention, the spontaneous combustion inhibitor is prepared in the form of a foam, sprayed with water and air, dispersed and coated on the bituminous coal in the form of a foam.

In the present invention, 96 wt% of water mixed with air was mixed with 4 wt% of the spontaneous combustion suppressant prepared in the form of a foam solution, and the mixture was dispersed and applied to bituminous coal in the form of foam.

In the present invention, the spontaneous combustion inhibitor is prepared by mixing 7 to 13 wt% of an antioxidant, 20 to 40 wt% of a volatile activation inhibitor, 20 to 40 wt% of an emulsifier compound, and 20 to 40 wt% of water.

In the present invention, the antioxidant of the spontaneous combustion inhibitor is composed of phenylenediamine for preventing the oxidation of bituminous coal.

In the present invention, the volatile activation inhibitor of the spontaneous combustion inhibitor is Methyldiethanolamine (MDEA) that suppresses activation of the volatile.

In the present invention, the emulsifier compound of the spontaneous combustion inhibitor is composed of 25 to 40% by weight of diethylene glycol butyl ether, 2 to 10% by weight of glycol ether, 3 to 10% by weight of a nonionic surfactant, and 45 to 65% by weight of a castor oil emulsifier.

The spontaneous combustion suppressant for bituminous coal having a foam liquid form according to the present invention is effective in that the spontaneous combustion suppressant is prepared in a water-soluble foam liquid form by using an antioxidant, a volatile activation suppressant and an emulsifier compound, and therefore, the spontaneous combustion suppressant prepared in a water-soluble foam liquid form is mixed with water and air without a fly-away suppressant and uniformly dispersed and applied in a foam form to bituminous coal in a conveyor system, thereby suppressing spontaneous combustion of bituminous coal and preventing scattering of bituminous coal.

In addition, since spontaneous combustion of bituminous coal can be suppressed by dispersing and applying the spontaneous combustion inhibitor to the bituminous coal, problems of power plant operation failure, bituminous coal waste, generation of offensive odor, and the like, which are caused by spontaneous combustion in indoor coal storage yards, can be prevented.

Further, since spontaneous combustion of bituminous coal is suppressed and scattering of bituminous coal can be prevented, it is possible to operate a bituminous coal power plant economically, safely, and environmentally using inexpensive bituminous coal.

Further, the spontaneous combustion inhibitor for bituminous coal is advantageous in that spontaneous combustion of bituminous coal can be inhibited easily and economically.

Further, the flow point of the spontaneous combustion inhibitor is naturally improved by Methyldiethanolamine (MDEA) contained in the spontaneous combustion inhibitor, and the spontaneous combustion inhibitor can be used even at a temperature of minus 20 degrees or less, so that the convenience of use can be improved and the storage tank does not need to be provided with a heat-insulating facility from the viewpoint of facilities.

In addition, since the emulsifier compound is contained sufficiently, there is no need to additionally reserve a fly-away preventive agent for spraying in a foam form, and therefore, the method is economical in terms of equipment cost and maintenance cost.

Detailed Description

The inventive spontaneous combustion inhibitor for bituminous coal in the form of foam liquid is characterized in that the inhibitor is prepared in the form of foam liquid, and is injected with water and air to be dispersed and coated on bituminous coal in the form of foam (Foaming).

The foam state refers to a water-soluble functional agent (product) which is mixed with water to cause foaming (foaming), the foaming state refers to foaming (foaming) generated when a spontaneous combustion inhibitor prepared in a water-soluble foam state is mixed with water, the spontaneous combustion inhibitor for bituminous coal according to the present invention can be mixed with water to prepare a spontaneous combustion inhibitor aqueous solution only if the product in the water-soluble foam state is a product in the water-soluble foam state, and only then the volume of the foaming rate degree can be amplified, so that the foaming state can be uniformly dispersed and coated on a large amount of bituminous coal. At this time, it is emphasized that the water solubility is because it is important that the core material of the spontaneous combustion inhibitor and water are well mixed. In other words, since a large amount of bituminous coal can be uniformly dispersed and coated when well mixed with water, only the effect can be expected.

As described above, in the present invention, the spontaneous combustion inhibitor is prepared in a water-soluble foam liquid form, and is used for dispersing and applying the core material of the spontaneous combustion inhibitor to all bituminous coals as uniformly as possible at an appropriate concentration (ppm), and even if the spontaneous combustion inhibitor is excellent in performance, if the foam liquid form is not developed, it is not possible to apply a 4 liter of the spontaneous combustion inhibitor aqueous solution to 1000kg of bituminous coal uniformly. Therefore, in order to coat a large amount of bituminous coal efficiently, the coating of the foaming form is inevitable, and in order to do so, the spontaneous combustion inhibitor is prepared in the form of a foam concentrate having an expansion ratio of about 10 times. At this time, according to the present invention, if 4 liters of the spontaneous combustion suppressant aqueous solution is held and sprayed in a foamed state, the amount of foam generation is 40 liters, so 40 liters of the spontaneous combustion suppressant in a foamed state can be prepared and dispersed and applied to 1000kg of bituminous coal.

Preferably, 96 wt% of water is mixed with 4 wt% of the spontaneous combustion suppressant prepared in the form of a foam liquid, and then dispersed and applied to the bituminous coal in the form of foam, and if less than 4 wt%, the stability of suppressing spontaneous combustion of the spontaneous combustion suppressant decreases, and if more than 4 wt%, the quality of the spontaneous combustion suppressant decreases. In other words, it is preferable that 96 wt% of water is mixed into 4 wt% of the spontaneous combustion inhibitor, and bituminous coal is uniformly dispersed and coated in a foamed form within a conveyor system using 3 or more foaming nozzles.

Here, the object is to mix the spontaneous combustion inhibitor according to the present invention with water so that foaming occurs well, and if air is mixed together, foaming occurs better, whereby the spontaneous combustion inhibitor can be uniformly dispersed and applied to the bituminous coal. In other words, there is no problem even if air is not artificially mixed into the spontaneous combustion inhibitor, and water is supplied by means of water pressure, and therefore, air is mixed together with water within the range of expansion ratio, so that foaming can be caused, but in order to cause foaming to be more generated, to be better maintained, it is preferable to mix air by a compressor or the like. At this time, preferably, the mixing ratio of the spontaneous combustion inhibitor aqueous solution and air is 1: 10.

as described above, the air can be injected in a foaming form even without mixing the air by a compressor or the like, but in the present invention, all of the bituminous coal mixed with the air and flowing into the indoor coal storage site can be subjected to a foaming bath, and thus the spontaneous combustion inhibitor can be uniformly dispersed and applied to the bituminous coal.

In this way, the spontaneous combustion inhibitor prepared in the form of a foam liquid is mixed with water and air and uniformly dispersed and applied to the bituminous coal in the form of foam, thereby preventing scattering of the bituminous coal dust, contributing to prevention of oxidation, suppression of activation of volatile matter, suppression of dust generation, suppression of temperature rise, and the like, and preventing humidity from decreasing, thereby finally suppressing spontaneous combustion of the bituminous coal until the bituminous coal moves from the coal storage yard to the combustion chamber.

The spontaneous combustion inhibitor according to an embodiment of the present invention is characterized in that 7 to 13 wt% of an antioxidant, 20 to 40 wt% of a volatile activation inhibitor, 20 to 40 wt% of an emulsifier compound, and 20 to 40 wt% of water are mixed to prepare the spontaneous combustion inhibitor.

The antioxidant inhibits spontaneous combustion of bituminous coal by inhibiting oxygen uptake in air or water. In this case, it is effective to mix 7 to 13 wt% of the antioxidant with respect to the entire spontaneous combustion inhibitor, and if less than 7 wt%, the oxidation stability of the spontaneous combustion inhibitor is reduced, and if more than 13 wt%, the mass of the spontaneous combustion inhibitor is reduced.

The volatile activation inhibitor suppresses spontaneous combustion of bituminous coal by suppressing activation of volatiles in the bituminous coal components. In this case, it is effective to mix 20 to 40 wt% of the volatile activation inhibitor with respect to the entire spontaneous combustion inhibitor, and if the amount is less than 20 wt%, the stability of suppressing spontaneous combustion of the spontaneous combustion inhibitor is reduced, and if the amount exceeds 40 wt%, the quality of the spontaneous combustion inhibitor is reduced.

The spontaneous combustion inhibitor for bituminous coal is prepared in a water-soluble foam liquid form by combining an antioxidant, a volatile activation inhibitor and an emulsifier as main components, and is mixed with water and air without an anti-scattering agent, so that the spontaneous combustion inhibitor is uniformly dispersed and coated on bituminous coal in a foaming form, thereby preventing spontaneous combustion and preventing scattering of bituminous coal.

The emulsifier compound contained in the spontaneous combustion inhibitor performs the following functions: not only can improve the emulsifying and dispersing force, but also can reduce the surface tension of water, disperse and coat the bituminous coal in a foaming form and prevent dust from flying. In this case, it is effective to mix 20 to 40 wt% of the emulsifier compound with respect to the whole spontaneous combustion inhibitor, and if less than 20 wt%, the emulsifying and dispersing power is reduced, and if more than 40 wt%, foaming is excessively generated, and the dispersing and coating properties are reduced, and the flow point is improved, and the usability is reduced.

In addition, the emulsifier compound contained in the spontaneous combustion inhibitor contains a solvent and a solubilizer, and performs the following functions: reduce viscosity, improve the binding force among the composition components, increase the usable time in addition, promote moisture drying efficiency.

The spontaneous combustion inhibitor according to an embodiment of the present invention is characterized in that the antioxidant is composed of phenylenediamine for preventing the oxidation of bituminous coal. At this time, the phenylenediamine, which is used as an antioxidant of the spontaneous combustion inhibitor, is stabilized by resonance, and thus, the activity for preventing oxidation is high, and particularly, the oxidation stability of the spontaneous combustion inhibitor is improved. Therefore, the phenylenediamine of the present invention can be effectively used as an antioxidant compound as an additive for delaying the oxidative decomposition of a spontaneous combustion inhibitor and further improving the oxidative stability.

The spontaneous combustion inhibitor according to an embodiment of the present invention is characterized in that the volatile activation inhibitor is composed of methyldiethanolamine which inhibits activation of volatiles. In this case, methyldiethanolamine, which is a volatile activation inhibitor used as a spontaneous combustion inhibitor, exhibits a base catalytic action by a hydrolysis reaction with water, has characteristics of deterioration resistance and corrosion resistance, and can be effectively used as a volatile activation inhibitor for suppressing activation of a volatile having a low ignition point, which is characteristic of a relatively high boiling point, a low vapor pressure, and the like. In this case, since the flow point is naturally improved by using Methyldiethanolamine (MDEA) as a main raw material and the system can be used even at minus 20 degrees or less, the convenience of use can be improved and the system may not be provided with a heat retaining device in the storage tank.

According to an embodiment of the present invention, the emulsifier compound of the spontaneous combustion inhibitor is composed of 25 to 40% by weight of diethylene glycol butyl ether, 2 to 10% by weight of glycol ether, 3 to 10% by weight of a nonionic surfactant, and 45 to 65% by weight of a castor oil emulsifier.

The diethylene glycol butyl ether has excellent characteristics of emulsifiability, low volatility, high boiling point and the like, and is used as a basic emulsifier. In this case, it is effective to mix 25 to 40% by weight of the diethylene glycol butyl ether with the whole emulsifier compound, and if less than 25% by weight, the emulsifiability is reduced, and if more than 40% by weight, the mass of the emulsifier compound is reduced.

The glycol ethers are effective as vehicles for emulsifying difficult to emulsify antioxidants. In this case, it is effective to mix 2 to 10 wt% of the glycol ether with the total amount of the emulsifier compound, and if the amount is less than 2 wt%, the effect of the solvent agent is reduced, and if the amount exceeds 10 wt%, the mass of the emulsifier compound is reduced.

The alkali mixture of the nonionic surfactant is excellent in solubility and stability, and therefore is used as a surfactant. In this case, it is effective to mix the nonionic surfactant in an amount of 3 to 10% by weight with respect to the total amount of the emulsifier compound, and if less than 3% by weight, the solubility and stability are reduced, and if more than 10% by weight, the mass of the emulsifier compound is reduced.

The castor oil-based emulsifier is excellent in dispersibility and foaming productivity, and thus is used as a solubilizer and a surfactant for completely dissolving an antioxidant, like glycol ether. In this case, it is effective to mix 45 to 65 wt% of the castor oil-based emulsifier with respect to the whole emulsifier compound, and if it is less than 45 wt%, dispersibility and foaming power are reduced, and if it exceeds 65 wt%, the mass of the emulsifier compound is reduced.

< evaluation of spontaneous Combustion inhibitor >

In order to evaluate the spontaneous combustion inhibitory properties of the spontaneous combustion inhibitor aqueous solution prepared according to the present invention, 1kg of bituminous coal in actual use was charged into a vessel, and after injecting an aqueous solution (4ml) of a spontaneous combustion inhibitor, the vessel was heated to 100 ℃ to trap harmful gases generated after activation of volatiles and examined.

In addition, for the purpose of forming a control experiment, 1kg of bituminous coal was charged into the same vessel without injecting the spontaneous combustion suppressant aqueous solution (4ml) prepared according to the present invention, heated to 100 ℃, and harmful gases generated after volatile activation were trapped and detected. As a result of the test, the amount of harmful gas generated was less in the bituminous coal injected with the spontaneous combustion inhibitor aqueous solution of the present invention than in the bituminous coal not injected with the spontaneous combustion inhibitor aqueous solution. From this fact, it is found that the spontaneous combustion inhibitor of the present invention has excellent spontaneous combustion inhibition properties by inhibiting activation of volatile substances at a temperature of 100 ℃ or lower and preventing oxidation.

Accordingly, the present invention has an advantage in that the spontaneous combustion suppressant is prepared in the form of a water-soluble foam liquid using an antioxidant, a volatile activation suppressant and an emulsifier compound, and therefore, the spontaneous combustion suppressant prepared in the form of a water-soluble foam liquid is mixed with water and air without an anti-scattering agent to uniformly disperse and coat the bituminous coal in the form of foam in a conveyor system, thereby preventing spontaneous combustion of the bituminous coal and preventing scattering of the bituminous coal.

Further, the present invention is advantageous in that, since spontaneous combustion of bituminous coal can be suppressed by dispersing and applying an aqueous solution of a spontaneous combustion inhibitor to the bituminous coal, problems of power plant operation failure, waste of bituminous coal, generation of malodor, etc. caused by spontaneous combustion can be prevented.

In addition, the present invention has an advantage in that it is possible to operate a bituminous coal power plant economically, safely, and environmentally using low-cost bituminous coal because spontaneous combustion of bituminous coal is suppressed and scattering of bituminous coal can be prevented.

In addition, the present invention has an advantage in that it is possible to prepare a spontaneous combustion suppressant for bituminous coal, which can suppress spontaneous combustion of bituminous coal simply and economically.

Further, the present invention has an advantage that the flowing point of the spontaneous combustion inhibitor is naturally improved by Methyldiethanolamine (MDEA) contained in the spontaneous combustion inhibitor, and the spontaneous combustion inhibitor can be used even at a temperature of minus 20 degrees or less, so that the convenience of use can be improved and the storage tank may not be provided with a heat-insulating facility from the viewpoint of facilities.

In addition, the present invention has an advantage in that it contains sufficient emulsifier compound, so that it is not necessary to additionally reserve a fly-away preventing agent for spraying in a foamed form, and therefore, it is economical in terms of equipment cost and maintenance cost.