Ignition improver

Abstract

The present invention can provide an ignition improver for improving the ignitability of emulsion fuels, solid fuels, and gaseous fuels. This ignition improver is one to be mixed with a liquid fuel or a solid fuel and then supplied to the combustion chambers of an internal combustion engine, and is characterized by comprising water containing either a soil bacterium having a dry diameter of 0.1-100 μm or dead bodies of the soil bacterium. The ignition improver is also one to be mixed with a gaseous fuel and then supplied to the combustion chambers of an internal combustion engine, and is characterized in that water containing either a soil bacterium having a dry diameter of 0.1-100 μm or dead bodies of the soil bacterium is sprayed and mixed with the gaseous fuel.

Description

Ignition improver

[0001] The present invention relates to the technical field of stabilization and ignition of the combustion of emulsion fuels, solid fuels, and gaseous fuels.

[0002] Conventionally, by adding surfactants and water to fuel for internal combustion engines and burning it, the combustion temperature is lowered but the expansion pressure is maintained by the vapor pressure of the mixed water. It is known that lowering the exhaust gas temperature and converting the resulting energy into kinetic energy saves fuel, thereby reducing fuel consumption and carbon emissions. It is also known that combustible dust has ignition properties (hereinafter referred to as "dust combustion").

[0003] Japanese Utility Model Application Publication No. 50-108070, Japanese Patent Application Publication No. 2017-221892

[0004] Patent Document 1 discloses an invention for burning combustible dust in factory exhaust gas. Patent Document 2 discloses an invention in which carbon dioxide generated by coal-fired power generation is used to cultivate oil-producing algae to extract oil from the algae, and the algae residue and moisture are added to coal and burned in a boiler, thereby making it possible to moderately lower the combustion temperature. The coal processed into pulverized coal used in coal-fired power generation has a particle size of 10 μm to 500 μm, and it is known that incomplete combustion generates soot (i.e., combustible dust) during power generation. Marine and aquatic microorganisms vary greatly in size, making selective cultivation difficult.

[0005] On the other hand, emulsion fuels, which are mixtures of water and liquid fuel, have issues with ignition and combustion continuity due to the lower combustion temperature caused by the inclusion of water. Furthermore, in internal combustion engines that use gaseous fuels, the combustion state is easily affected by the amount of water. Furthermore, with solid fuels, sufficient ignition may not be achieved depending on the average particle shape of the solid fuel. The object of the present invention is to improve the ignition and combustion continuity of emulsion fuels, solid fuels, or gaseous fuels.

[0006] In order to solve the above problem, one embodiment of the present invention provides an ignition improver that is mixed with liquid fuel or solid fuel, and is characterized by containing soil bacteria having a dry diameter of 0.1 to 100 μm or water containing the corpses of the soil bacteria.

[0007] The ignition improver contains water and soil bacteria or dead soil bacteria with a dry diameter of 0.1 to 100 μm. The soil bacteria or dead soil bacteria function as combustible dust, promoting the ignition of emulsion fuel or solid fuel. Furthermore, the soil bacteria have a cell membrane with a phospholipid bilayer structure, and due to their surfactant properties, can be dispersed in both polar substances such as water and non-polar substances such as liquid fuel. Furthermore, soil bacteria are composed of carbohydrates, lipids, proteins, and trace amounts of minerals, with the majority of their composition being organic matter, which is a combustible component. In a combustion chamber under high-temperature, dry conditions, the organic matter contained in the ignition improver generates combustible gas from its surface. Furthermore, due to the surfactant properties of the cell membrane, the soil bacteria do not settle in the emulsion fuel, and the combustible gas generated from the organic matter provides an ignition improver with excellent ignition and combustion continuity.

[0008] In order to solve the above problem, one embodiment of the present invention provides an ignition improver that is mixed with gaseous fuel, and is characterized in that soil bacteria having a dry diameter of 0.1 to 100 μm or water containing the corpses of the soil bacteria is sprayed and mixed with the gaseous fuel.

[0009] The soil bacteria having a dry diameter of 0.1 to 100 μm or water containing the corpses of the soil bacteria can be sprayed and mixed with gaseous fuel. Furthermore, for example, the amount of soil bacteria water sprayed can be adjusted according to the combustion state of the internal combustion engine. This stabilizes the combustion state of the internal combustion engine when water is added, thereby providing an effective combustion state.

[0010] In order to solve the above problems, the ignition improver of the present invention can be characterized as being for use in an internal combustion engine, which is supplied to the combustion chamber of the internal combustion engine.

[0011] The use of emulsion fuel in internal combustion engines poses a challenge in that the combustion temperature decreases due to the heat of vaporization. In particular, as the water content of the emulsion fuel increases, the heat of vaporization increases, significantly reducing the combustion temperature. Furthermore, when solid fuel is used in an internal combustion engine, ignition due to the addition of water is also a problem. The ignition improver of the present invention allows emulsion fuel to be ignited even when the water content of the emulsion fuel is high. Even in the case of pulverized solid fuel, the combustion of the pulverized fuel is assisted by the effect of the combustible gas generated during the bacterial dust combustion process, thereby stabilizing combustion. The increased water vapor produced by the addition of water improves the energy efficiency of the internal combustion engine.

[0012] In order to solve the above problems, the ignition improver of the present invention can be characterized in that it is mixed with gaseous fuel by a spray device and supplied to a combustion chamber of an internal combustion engine.

[0013] By spraying and mixing the soil bacteria water into the intake air, a spray nozzle is required to spray the soil bacteria water, but the emulsion generation process is unnecessary, so there is no need to add a surfactant. Furthermore, because it is added through a spray nozzle, it is possible to adjust the amount sprayed according to the combustion state, ensuring stable combustion at all times, which is advantageous for combustion engines whose output varies greatly, such as automobile engines.

[0014] In order to solve the above problem, one embodiment of the present invention provides an ignition improver that is mixed with liquid fuel, solid fuel, or gaseous fuel, and is characterized by comprising a cultivation process for culturing soil bacteria water, which is a mixture of soil bacteria, additives, and water; a filtration process for filtering the soil bacteria water that has undergone the cultivation process; and a sterilization process for sterilizing the soil bacteria water that has undergone the filtration process.

[0015] By having a cultivation process for cultivating soil bacteria suitable for combustion assistance, a filtration process for uniformizing the particle size of the soil bacteria suitable for combustion assistance and removing impurities from the soil bacteria water to improve combustion assistance properties, and a sterilization process for immobilizing the soil bacteria water to a bacterial density suitable for combustion assistance, it is possible to provide an ignition improver suitable for combustion assistance for liquid fuels, solid fuels, and gaseous fuels.

[0016] In order to solve the above problem, one embodiment of the present invention provides a method for producing an ignition improver, wherein the mixed water is sterilized at 55 to 70°C in the sterilization step.

[0017] The above-mentioned production method makes it possible to sterilize in a bacterial environment more suitable for combustion, and therefore it is possible to provide an ignition improver that is more suitable for assisting the combustion of liquid fuels, solid fuels, and gaseous fuels.

[0018] The ignition improver of the present invention can improve ignition and combustion continuity in emulsion fuels, solid fuels, and gaseous fuels even when water is added due to the combustion-assisting effect of bacterial dust combustion, and can improve combustion efficiency and achieve energy savings by increasing water vapor and lowering combustion temperature.

[0019] FIG. 1 is a side view illustrating an example of an embodiment of the present invention. FIG. 2 is a side view illustrating an example of an embodiment of the present invention. FIG. 3 is an explanatory diagram illustrating the culturing step in the manufacturing method of an ignition improver of the present invention. FIG. 4 is an explanatory diagram illustrating the culturing step in the manufacturing method of an ignition improver of the present invention.

[0020] This article describes water containing soil bacteria with a dry diameter of 0.1 to 100 μm or the corpses of such soil bacteria (hereinafter referred to as "soil bacteria water"). Unless otherwise specified, percentages in this specification are expressed as mass percentages. The solid:liquid mixture ratio is a mass ratio, and the liquid:liquid mixture ratio is a volume ratio.

[0021] If the dust particle size in the combustion chamber is too large, it takes too long for the dust to burn, preventing complete combustion. During a dust explosion, flammable gas is generated from the dust surface and ignites due to ignition factors such as high temperature. However, if the particle size is large, the surface area relative to the powder weight becomes small, and the concentration of the generated flammable gas becomes diluted, preventing ignition. Furthermore, if the dust particle size in the combustion chamber is too large, problems occur such as settling during storage after mixing or clogging of the injection hole. Furthermore, if the dust particle size in the combustion chamber is too small, oxidation in the air progresses, suppressing the generation of flammable gas and making handling during storage and manufacturing difficult. The explosion range of a dust explosion is known to be a dust particle size range of 0.1 to 100 μm.

[0022] The soil bacteria referred to in the present invention are not particularly limited as long as they are soil bacteria contained in soil, but preferred soil bacteria in this embodiment include bacteria such as actinomycetes, Bacillus, and obligately anaerobic bacteria of the genus Clostridium, such as Bacillus subtilis (Bacillus subtilis), Bacillus cereus, Bacillus penetrans, Bacillus licheniformis, Clostridium botulinum, Clostridium butyricum, Clostridium thermocellum, and fungi such as Bacillus megaterium, Trichoderma, and rhizobia, such as Trichoderma hamatum. Suitable anaerobic bacteria include yeasts such as Trichoderma hamatum, Trichoderma harzianam, Trichoderma polysporum, Trichoderma konigii, Trichoderma viride, and Saccharomyces cerevisiae, as well as facultative anaerobic bacteria such as Staphylococcus aureus, Corynebacterium aureus, and Escherichia coli, and mixtures thereof. Facultative anaerobic bacteria include Clostridium genus, such as Clostridium botulinum, Clostridium butyricum, and Clostridium thermocellum, and mixtures thereof.

[0023] Unlike aquatic microorganisms such as cyanobacteria, soil bacteria include a variety of intestinal microorganisms found in many animals. They are easily cultivated using a wide range of nutrients, and the number and size of bacteria can be easily controlled by culturing them under various conditions. For example, observed Clostridium butyricum bacteria are 0.5-0.7 x 1.5-1.9 x 14-16 μm, whereas soil bacteria are likely to fall within the range of 0.1-100 μm. On the other hand, some cyanobacteria, such as Microcystis, have particle sizes exceeding 100 μm, and even larger ones have been observed forming colonies. Furthermore, depending on the culture conditions, cyanobacteria can proliferate in large numbers, potentially leading to the formation of blue-green algae, making bacterial population control difficult. Soil bacteria are composed of carbohydrates, lipids, proteins, and trace minerals, and are mostly flammable. In the high-temperature, dry internal combustion chamber, flammable gases are generated from the surface of the soil bacteria, igniting the flames within the chamber. This in turn ignites other soil bacteria. When a large amount of water is present in the internal combustion chamber, the combustion temperature drops and combustion can continue even in an environment where the combustion state is prone to change.

[0024] Adding water to the combustion chamber of an internal combustion engine increases the amount of steam generated and lowers the exhaust gas temperature. Because the amount of steam increases, even if the amount of fuel input is reduced, the amount of work done to the outside remains the same. This makes it possible to reduce fuel consumption by the amount that the exhaust gas temperature is lowered. However, adding water during combustion tends to change the combustion state, making the combustion unstable or causing misfires. As the proportion of water vapor in the gas being burned increases, the combustible gas is diluted with the steam, causing a significant change in the combustion state.

[0025] By supplying soil bacteria water to the combustion chamber of an internal combustion engine, the soil bacteria containing water will become dispersed as dust in the combustion chamber of the internal combustion engine, but it takes time for the water to evaporate and for the soil bacteria to release combustible gas. As a result, ignition occurs slightly later than the ignition timing of the internal combustion engine, near top dead center in the case of an engine, and near the maximum compression point in the case of a turbine, stabilizing the combustion state in the combustion chamber of the internal combustion engine.

[0026] The liquid fuel used in the present invention is not particularly limited and is generally used in internal combustion engines, and examples thereof include gasoline, diesel, kerosene, heavy oil, alcohol, liquefied fuels obtained by liquefying coal, vegetable oils, and fatty acids extracted from animal oils.

[0027] The solid fuel used in the present invention is not particularly limited and may be any fuel generally used in boilers for power generation, etc. Specific examples include coal, charcoal, coke, solid alcohol, and combustible biomass such as wood.

[0028] The additives used in the present invention are those that are necessary for the cultivation of soil bacteria, and examples thereof include nitrogen, protein, carbohydrates, vitamins, and mineral components.

[0029] The emulsion fuel used in the present invention may contain an emulsifier. Commonly used emulsifiers include anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants. Anionic surfactants include sodium fatty acid salts, potassium fatty acid salts, alpha-sulfo fatty acid methyl ester salts, sodium linear alkylbenzene sulfonate, sodium alkyl sulfate esters, sodium alkyl ether sulfate esters, sodium alpha-olefin sulfonate, and sodium alkyl sulfonates. Nonionic surfactants include sucrose fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, fatty acid alkanolamides, polyoxyethylene alkyl ethers, and polyoxyethylene alkyl phenyl ethers. Cationic surfactants include alkyltrimethylammonium salts and dialkyldimethylammonium salts. Amphoteric surfactants include sodium alkylamino fatty acids, alkyl betaines, and alkylamine oxides.

[0030] For example, the emulsifier can be added in an amount of preferably 0.1 to 3%, more preferably 1 to 1.5%, based on the total weight of fuel oil and water. It has been confirmed that this emulsifier not only mixes the liquid fuel and water, but also inhibits water solidification at low temperatures and provides rust and corrosion protection for metals inside piping when emulsion fuel is used.

[0031] However, when soil bacteria water is made into mist and mixed with gaseous fuel as in Example 3 below, the emulsifier is not necessarily required.

[0032] The mixing ratio of soil bacteria water to liquid fuel is preferably within the range of 10:1 to 1:1, and more preferably within the range of 8:1 to 1:1. If the ratio of soil bacteria water exceeds this range, the amount of water entering the combustion chamber increases, which tends to make ignition in the combustion chamber of the internal combustion engine difficult, and if the ratio of liquid fuel exceeds this range, the exhaust gas temperature increases, which increases the amount of energy wasted, reducing the energy saving effect of the internal combustion engine.

[0033] By burning soil bacteria water with fuel in the combustion chamber, the heat generated by the soil bacteria combustion replenishes the heat needed to continue combustion, making up for the drop in combustion temperature caused by the addition of water, stabilizing combustion and supplying more water to the combustion chamber. This generates water vapor, lowering the exhaust gas temperature and improving the energy conversion efficiency of the combustion chamber in internal combustion engines. Furthermore, in boilers, adding water to the combustion chamber lowers the combustion temperature and exhaust gas temperature. Compared to high temperatures, the amount of radiation energy in the short-wave infrared range, which corresponds to the atmospheric window, from the boiler walls is reduced, and the increased water vapor in the exhaust increases the amount of radiation in the mid- and long-wave infrared ranges, which have a high greenhouse effect, improving thermal efficiency, thereby reducing the amount of fuel consumed and carbon emissions.

[0034] The emulsions shown in Table 2 below were burned in a kerosene boiler and the state of combustion was observed.

[0035] [Method for Preparing Soil Bacteria Water] To prepare soil bacteria water, an aqueous solution containing additives such as minerals and organic matter dissolved in fresh water is incubated at approximately 30°C in the summer and at 25-35°C with hot water in the winter. The nutrient solution is then incubated for approximately 1-2 weeks in a nutrient solution containing soil bacteria held in sawdust. The supernatant is collected from the nutrient solution saturated with bacteria and filtered through coarse filter paper to obtain pure water. This is then subjected to low-temperature sterilization at 63°C for 30 minutes to obtain soil bacteria water. Diluted soil bacteria water is prepared by diluting soil bacteria water 50 times by volume and adding a surfactant to the diluted solution to a concentration of 1% by volume. The "Water" in Table 2 simply refers to water to which a surfactant has been added to make a 1% by volume concentration.

[0036] The soil bacteria water was prepared so that the ratio of soil bacteria carrier weight to additives to water was 0.5:19.5:80. The soil bacteria carrier:water ratio is preferably in the range of 1:70-200, and more preferably in the range of 1:80-100. A water ratio of less than 70 is unsuitable for the growth of soil bacteria. A water ratio of more than 200 tends to make it difficult to obtain the effect of dust combustion.

[0037] Soil bacteria carriers, specifically sawdust, are carriers onto which bacteria that have been soaked in cultured soil bacteria water and dried are attached. Immediately after cultivation, the soil bacteria water is cloudy and odorous, but as cultivation progresses, the added nutrients of the bacterial culture, which are organic components other than the bacteria, are consumed, reducing the odor and increasing the liquid's transparency. Figure 3 shows the appearance of the liquid immediately after cultivation, and Figure 4 shows the appearance of the liquid at the time of use. Typically, impure organic matter other than dead soil bacteria is eliminated within 1 to 2 weeks, making the liquid ready for use as soil bacteria water. Filtration is performed using a 100 μm mesh water treatment filter to filter out bacteria with a wet diameter of 100 μm or larger, thereby reducing the dry diameter of the bacteria that pass through the filter to 50 μm or less.

[0038] Sterilization stabilizes the bacterial species composition and bacterial mass. Because the protein that constitutes the bacteria is susceptible to thermal denaturation at high temperatures, sterilization of soil bacteria water is preferably performed under conditions that suppress protein denaturation, oxidation, and shape change. Specifically, the water temperature to be sterilized is preferably 50°C to 100°C, and more preferably 55°C to 70°C. Furthermore, it is preferable to adjust the sterilization time under these temperature conditions. For example, when sterilizing at 55°C to 70°C, it is preferable to adopt the sterilization time shown in Table 1. Furthermore, in addition to or instead of the above-mentioned heat sterilization, high-pressure sterilization, retort sterilization, etc. may be performed. After the sterilization time has elapsed, the surrounding area of ​​the container is promptly cooled with cold water to lower the water temperature to near room temperature. At high temperatures, denaturation of proteins contained in the soil bacteria can cause discoloration due to oxidation (e.g., browning), changes in bacterial size due to changes in the protein's three-dimensional structure, and denaturation. Furthermore, at low temperatures, sterilization may not be sufficient. In such cases, sufficient effectiveness may not be achieved when mixing with emulsion fuel or when burning dust. The same tendency is observed even when sterilization is carried out beyond the maximum sterilization time in Table 1.

[0039]

[0040] [Ignition and Combustibility Tests] Emulsion fuels were produced in the proportions shown in Table 2, and ignition and flammability tests were conducted in the combustion chamber of an internal combustion engine. Emulsion fuel A ignited, and its flammability was confirmed. Emulsion fuel B was confirmed to have the same ignition and flammability as emulsion fuel A, but emulsion fuel C did not ignite in the combustion chamber of the internal combustion engine, and its flammability could not be confirmed in the combustion chamber of the internal combustion engine.

[0041] In the experiments with the kerosene boiler described above, as shown in Table 2, the limit for stable combustion of an emulsion that did not contain soil bacteria was a kerosene to water ratio of 7:3, but with an emulsion containing soil bacteria, combustion continued stably even at a ratio of 1:1. Because soil bacteria that meet the nutritional and environmental conditions under the above culture conditions grow and are sterilized, they have uniform particle size, their cell membranes are surface active, and they are highly compatible with water, making it possible to obtain soil bacteria water that is ideal for use as a dust mixture.

[0042]

[0043] [Embodiment 1] This embodiment will be described with reference to Figure 1. Figure 1 shows a diesel engine for a generator. Reference numeral 101 denotes a fuel tank, 102 denotes a mixing tank, 103 denotes a soil bacteria water tank, 104 denotes a spray nozzle, 105 denotes a cylinder head, 106 denotes a combustion chamber, 107 denotes a piston, 108 denotes diluted soil bacteria water, 109 denotes liquid fuel, and P denotes a liquid feed pump. The method for producing diluted soil bacteria water is the same as described above.

[0044] Assume that diluted soil bacteria water 108 and liquid fuel 109 are mixed and stirred in a 1:1 ratio in a mixing tank 102 to produce emulsion fuel. After the temperature inside the combustion chamber is raised to a temperature above the ignition point by a piston 107, the emulsion fuel is sprayed into the combustion chamber 106 from a spray nozzle 104 by a liquid feed pump P.

[0045] [Embodiment 2] This embodiment will be described with reference to Fig. 2. Fig. 2 shows an automotive diesel engine. 201 is a fuel tank, 202 is a soil bacteria water tank, 203 and 204 are spray nozzles, 205 is a cylinder head, 206 is a combustion chamber, 207 is a piston, 208 is diluted soil bacteria water, 209 is liquid fuel, and P is a liquid feed pump.

[0046] The method for producing the diluted soil bacteria water is the same as described above. Regarding the concentration of the emulsion fuel, the liquid pump P is controlled so that the ratio of the liquid fuel 209 to the diluted soil bacteria water 208 is 7:3 at high output, and is controlled so that the ratio is 1:1 at low load. The ratio is variably adjusted between 7:3 and 1:1 depending on the magnitude of the load.

[0047] The diluted soil bacteria water 208 and the liquid fuel 209 are mixed and stirred in a 1:1 ratio in the soil bacteria water tank 202 to produce emulsion fuel. After the temperature inside the combustion chamber is raised to above the ignition point by the piston 207, the emulsion fuel is sprayed into the combustion chamber 206 from the spray nozzle 204 by the liquid feed pump P.

[0048] [Embodiment 3] A mixed water prepared by removing the surfactant from the diluted soil bacteria water was sprayed and mixed into the intake of a kerosene boiler installed in a greenhouse (not shown). The amount of mixed water sprayed into the combustion chamber of the internal combustion engine may be adjusted by a sensor module that monitors the combustion status of the combustion chamber and a temperature sensor module for the combustion chamber.

[0049] Compared to carbon dioxide, water vapor has an absorption and emission band in the infrared wavelength range that has a wide greenhouse effect, so when water is added to the combustion chamber and the amount of water vapor increases, the amount of water vapor emitted from the boiler also increases, and even if the exhaust gas is diluted with water vapor and the temperature drops, the amount of infrared radiation in the medium and long wavelength ranges emitted by the exhaust water vapor increases, making it possible to reduce fuel consumption by 40%. Also, when using a humidifier to humidify the greenhouse, water droplets may adhere to the crops inside, damaging their commercial value, but in this embodiment, water droplets did not adhere to the crops inside the greenhouse.

[0050] The amount of fuel consumed and carbon emissions can be reduced by using the dust combustion effect to mix water. In internal combustion engines, it can be used in engines and gas turbines. In engines, it can be used in marine diesel engines and power generation engines with low rotation speeds. In internal combustion engines, it can produce energy savings by lowering the exhaust gas temperature. When used on ships, it can be more effective by combining a desalination device using ultrafiltration with the internal combustion engine.

[0051] Solid fuels such as coal and coke are pulverized and burned, but when the particle size is irregular and a large amount of water is added, combustion becomes unstable and carbon monoxide is generated because some particles have diameters of 100 μm or more, which are difficult to burn by dust combustion alone.By mixing the soil bacteria water of the present invention, which has a uniform particle size, into the combustion chamber, stable combustion is possible even when water is added, and carbon monoxide generation is suppressed.

[0052] (Solid Fuel Ignition Improvement Experiment) In a ventilated greenhouse, a mesh was placed in the combustion area of ​​an oil-gas burner that uses kerosene as fuel, and coal was placed on top of the mesh. The coal was then ignited, and the temperature and carbon monoxide concentration of the outer flame were measured. When the coal began to burn, the temperature of the outer flame of the oil-gas burner was 396-400°C, and the carbon monoxide concentration in the greenhouse was 17-20 ppm. Meanwhile, when a similar experiment was conducted using diluted soil bacteria water prepared under the above conditions and sprayed with a humidifier, the temperature of the outer flame of the oil-gas burner was 340-352°C, and the carbon monoxide concentration in the greenhouse was 0-5 ppm.

[0053] (Experiment to Improve Ignition of Liquid Fuel) In a ventilated greenhouse, an oil heater using kerosene as fuel was ignited with water sprayed from a humidifier, and the temperature of the outer flame and carbon monoxide concentration were measured. The temperature of the outer flame of the oil heater was 385°C to 400°C, and the carbon monoxide concentration in the greenhouse was 9 to 20 ppm. On the other hand, when a similar experiment was conducted with diluted soil bacteria water prepared under the above conditions sprayed from a humidifier, the temperature of the combustion part of the outer flame of the oil-gas burner equipment when coal began to burn was 340°C to 358°C, and the carbon monoxide concentration in the greenhouse was 0 to 5 ppm.

[0054] The above experiment showed that when diluted soil bacteria water was sprayed, ignition occurred at a lower temperature than when it was not sprayed, demonstrating its effect of improving ignition of solid and liquid fuels, and that when diluted soil bacteria water was sprayed, carbon monoxide generation was suppressed more than when it was not sprayed, demonstrating its effect of stabilizing the combustion of solid and liquid fuels.

[0055] Although the present invention has been described in detail above using examples, the present invention is not limited to these examples. Furthermore, the configurations and processing functions described in the above embodiments can be selected and combined as desired, and it is obvious that a person skilled in the art can adopt modified forms based on the technical ideas and teachings of the present invention.

[0056] 101, 201 Fuel tank 102 Mixing tank 103, 202 Soil bacteria water tank 104, 203, 204 Spray nozzle 105, 205 Cylinder head 106, 206 Combustion chamber 107, 207 Piston 108, 208 Diluted soil bacteria water 109, 209 Liquid fuel P Liquid feed pump

Claims

1. A combustion improver for liquid fuel or for mixing with solid fuel, characterized by containing water containing at least one of viable bacteria and dead bodies of soil bacteria having a dry diameter of 0.1 to 100 μm.

2. A combustion improver for mixing with gaseous fuel, characterized by containing water containing at least one of viable bacteria and dead bodies of soil bacteria having a dry diameter of 0.1 to 100 μm in a sprayable amount.

3. The combustion improver according to claim 1 or 2 for a combustion chamber of an internal combustion engine.

4. A method for producing a combustion improver for mixing with liquid fuel, solid fuel, or gaseous fuel, comprising: a culturing step of culturing soil bacteria water in which soil bacteria, an additive, and water are mixed; a filtering step of filtering the soil bacteria water that has undergone the culturing step; and a sterilizing step of sterilizing the soil bacteria contained in the soil bacteria water that has undergone the filtering step.

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