TWI632290B - Cleaning method for combustion engine cylinders - Google Patents

Abstract

A method for purifying an engine cylinder (900), comprising the steps of: (901) providing a high viscosity oil essence and a hydrogen oxygen supply machine; (902) pouring a high viscosity oil essence into an engine to pre-protect the cylinder; (903) Introducing the outlet pipe of the hydrogen oxygen supply machine into the intake port of the engine; (904) starting the hydrogen oxygen supply machine and the engine, so that hydrogen and oxygen generated by the hydrogen oxygen supply machine enter the engine and the fuel co-combustion; (905) maintaining the engine idle operation For a preset period of time, the preset time is not less than 15 minutes. The complete combustion of the fuel causes the carbon deposit in the cylinder to be volatilized and discharged through high-temperature combustion carbonization to achieve the effect of cleaning and purifying the cylinder; (906) closing the hydrogen oxygen supply machine and the engine.

Description

Engine cylinder purification method

This invention relates to cleaning techniques, and more particularly to a cleaning method for removing carbon deposits from engine cylinders.

According to the Asian Development Bank, Asia's fast-growing metropolis has serious air pollution, with Beijing being the dirtiest city and Xi'an. According to the statistics of the United Nations Environment Program, the Chinese government has spent more than $170 billion on environmental pollution in Beijing in recent years, and has also implemented a series of measures to improve Beijing's air quality. According to a survey by the United Nations Environmental Protection Agency, 75% of carbon oxides, 50% of hydrocarbons and nitrogen oxides in urban air pollution come from exhaust emissions from fuel vehicles. In Europe and the United States with large car ownership and some large cities in China, 60% to 80% of air pollution sources come from automobile exhaust.

The power plant containing the engine used in the prior art is powered by petroleum fuel (such as gasoline or diesel). The power equipment converts petroleum fuel into oil and gas, and mixes it with air in a certain proportion and then introduces it into the engine. It uses explosive combustion to convert the chemical energy of petroleum fuel into kinetic energy, thereby driving the transmission device and driving the whole mechanism. After combustion, the fuel will form an exhaust gas containing carbon dioxide and other carbon oxyhydroxides.

In the operation of the engine, if there is too much fuel impurity, the fuel and the oil entering the combustion chamber cannot be completely burned in the cylinder under the condition of insufficient oxygen supply, and the oil smoke and the run will be generated. Oil burnt particles. When the engine continues to run, it is further oxidized to become colloidal, sticking to the top of the piston, the piston ring, the back of the valve, the inner surface of the intake pipe, the throttle valve body and the combustion chamber, and the like. Under the repeated action of high temperature, the gum is changed into asphaltene, resinous and carbonaceous, thereby forming carbon deposits. The more accumulated carbon in the engine cylinder, the lower the combustion efficiency, not only the fuel consumption, but also the higher the concentration of harmful substances contained in the exhaust gas.

Regularly cleaning the carbon deposits in the engine cylinders will help improve the combustion efficiency of the engine during operation, completely burn the oil and gas, and reduce the emission of harmful substances.

In the prior art, the Chinese mainland patents CN201010191790.8 and CN201020660425.2 disclose two kinds of cleaning devices for cleaning cylinders, and the complex cylinder structure can be cleaned by putting an organic solvent into the cleaning device. However, organic solvents that are too concentrated are not friendly to the environment and cause pollution; if they are not handled properly, they will cause corrosion of the cylinder parts, which is not worth the candle.

The invention provides a method for purifying an engine cylinder 900. By using an organic solvent without generating an organic solvent, pure and high-concentration hydrogen and oxygen are generated by high-efficiency electrolysis, and is introduced into an intake port of the engine. Since high concentration of hydrogen and oxygen can improve combustion efficiency, Promote efficient combustion during engine operation, completely burn the oil and gas, and volatilize the carbon in the cylinder through high-efficiency combustion to achieve the effect of cylinder cleaning. The engine cylinder purification method 900 proposed by the present invention comprises the following steps: (901) providing a high-viscosity oil essence and a hydrogen-oxygen supply machine 1, the hydrogen-oxygen supply machine 1 has an air outlet pipe 710; (902) pouring high-viscosity oil essence into the engine; (903) the hydrogen-oxygen supply machine 1 The air outlet pipe 710 is introduced into the intake port of the engine; (904) the hydrogen oxygen supply machine 1 and the engine are started; (905) Maintaining the engine idle speed for a preset time, the preset time is not less than 15 minutes; (906) turning off the hydrogen oxygen supply machine 1 and the engine.

The hydrogen oxygen supply machine 1 comprises a hydrogen oxygen electrolysis generating device 100, an electrolysis water tank 200, a first pipeline 400, a second pipeline 500, an electrolyte pump 450, a radiator 550, and a first The three pipes 800 and one water washing bottle 700 are filled with the electrolyte 210, the hydrogen oxygen electrolysis generating device 100 is used for electrolysis to generate hydrogen and oxygen, and the first pipe 400 is connected to the electrolysis water tank 200 and the hydrogen oxygen electrolysis generating device 100. Near the bottom, for transporting the electrolyte 210, the second conduit 500 is connected to the vicinity of the upper portion of the hydrogen-oxygen electrolysis generating device 100 and the electrolysis tank 200 for transferring generated hydrogen and oxygen, and the electrolyte pump 450 is provided with the first conduit. 400, the radiator 550 is disposed in the second pipeline 500, the third pipeline 800 is connected to the top of the electrolysis water tank 200, and extends into the bottom of the water washing bottle 700. The top of the water washing bottle 700 further includes an air outlet pipe 710.

The method for purifying the engine cylinders proposed by the present invention mainly consists in generating a large amount of high-concentration hydrogen and oxygen through the hydrogen-oxygen electrolysis generating device 100, and then passing through the water washing bottle 700, and introducing hydrogen and oxygen into the water through the third pipe 800. The original hydrogen and oxygen impurities or vaporized electrolyte components are washed, and then the pure hydrogen and oxygen are supersaturated and introduced into the running engine inlet to enter the engine. When hydrogen and oxygen are mixed with fuel, the combustion efficiency of the engine can be improved, and the carbon deposit in the cylinder can be carbonized and volatilized by high-efficiency combustion to achieve the effect of cleaning the cylinder. After cylinder cleaning, under normal use conditions, the combustion efficiency will be better than before cleaning, and the power output is better.

900‧‧‧How to clean engine cylinders

901, 902, 903, 904, 905, 906‧‧ ‧ purification steps for engine cylinders

1‧‧‧Hydrogen Oxygen Supply Machine

100‧‧‧Hydrogen Oxygen Electrolysis Generator

150‧‧‧Inverter DC power supply

151‧‧‧DC positive electrode

152‧‧‧DC negative

111‧‧‧ positive plate

112‧‧‧Negative plate

113‧‧‧Electrolytic plate

200‧‧‧electrolytic water tank

210‧‧‧ electrolyte

220‧‧‧ airtight water tank cover

230‧‧‧Exhaust valve

400‧‧‧First line

450‧‧‧ electrolyte pump

500‧‧‧Second pipeline

550‧‧‧heatsink

800‧‧‧ third pipeline

700‧‧‧Washing bottle

710‧‧‧Exhaust pipe

720‧‧‧ water

1 is a schematic illustration of a method 900 for purifying an engine cylinder in accordance with a preferred embodiment of the present invention.

Figure 2 is a schematic illustration of a hydrogen-oxygen supply machine 1 in accordance with a preferred embodiment of the present invention.

3 is a schematic diagram of a hydrogen-oxygen electrolysis generating apparatus 100 in a preferred embodiment of the present invention.

The present invention mainly discloses a method for purifying an engine cylinder. The basic principles of the internal combustion engine and the electrochemical system used therein are well known to those skilled in the relevant art, and therefore, the following description is not fully described. At the same time, the drawings referred to in the following text mainly represent the structural schematics related to the features of the present invention, and do not need to be completely drawn according to the actual size, which will be explained first.

Please refer to FIG. 1 , which is a schematic diagram of a preferred embodiment of the present invention, and is a method for purifying an engine cylinder, comprising the following steps:

(901) A high-viscosity oil essence and a hydrogen-oxygen supply machine 1 are provided, wherein the hydrogen-oxygen supply machine 1 has an air outlet pipe 710 which can derive hydrogen gas and oxygen gas.

(902) Open the oil cap of the engine and pour the high-viscosity oil into the engine; since most of the cars are cleaning the cylinders, it is usually a long time since the last time the oil was changed. Most of the oil has deterioration, insufficient viscosity, and insufficient portion. At this time, the high-viscosity oil can be poured in advance to properly protect the cylinder during subsequent cleaning of the carbon deposit.

(903) The air outlet pipe 710 of the hydrogen-oxygen supply machine 1 is introduced into the intake port of the engine.

(904) The hydrogen-oxygen supply machine 1 and the engine are started. At this time, hydrogen and oxygen generated by the hydrogen-oxygen supply machine 1 enter the engine through the intake port of the engine.

(905) Maintain the engine idle speed for a preset period of time, let the engine through the efficient complete combustion, the cylinder coke is slowly burned and carbonized and volatilized; The displacement of the cylinder is determined; the larger the displacement, the longer the preset time; the smaller the displacement, the shorter the preset time; but the shortest time is not less than 15 minutes.

(906) Turn off the hydrogen oxygen supply machine 1 and the engine.

The hydrogen-oxygen supply machine 1 used in the above steps, referring to the schematic diagram of FIG. 2, includes a hydrogen-oxygen electrolysis generating device 100, an electrolysis water tank 200, a first line 400, and a second line 500. The electrolytic water tank 200 is filled with an electrolytic solution 210, and the electrolytic solution 210 cannot be filled, and an appropriate space is reserved above. The hydrogen-oxygen electrolysis generating apparatus 100 is for electrolyzing hydrogen and oxygen, and the first line 400 is connected to the vicinity of the bottom of the electrolysis tank 200 and near the bottom of the hydrogen-oxygen electrolysis apparatus 100 for transporting the electrolyte 210 in the electrolysis tank 200 to Hydrogen and oxygen electrolysis generating device 100. The second conduit 500 connects the hydrogen-oxygen electrolysis generator 100 and the vicinity of the upper portion of the electrolysis tank 200, and transfers hydrogen gas and oxygen generated by the hydrogen-oxygen electrolysis generator 100 to a space above the electrolyte tank 200 and above the electrolyte 210.

In order to increase the efficiency of electrolysis of hydrogen and oxygen, the hydrogen-oxygen supply machine 1 of the present invention further comprises an electrolyte pump 450, a radiator 550, a third conduit 800, and a water wash bottle 700.

The electrolyte pump 450 is disposed in the first line 400, and the electrolyte 210 in the electrolysis tank 200 is continuously or intermittently delivered to the hydrogen-oxygen electrolysis apparatus 100 as needed. When the electrolyte in the hydrogen-oxygen electrolysis generating apparatus 100 is consumed, the electrolytic generation efficiency of hydrogen gas and oxygen gas is affected by the insufficient capacity or the concentration change, whereby the electrolysis production efficiency of hydrogen gas and oxygen gas can be stabilized.

Since the electrolysis process generates a large amount of heat energy, the process of electrolyzing hydrogen and oxygen in the hydrogen-oxygen electrolysis generating apparatus 100 of the present invention produces a large amount of heat energy. A large amount of thermal energy affects the stability of the electrolysis process on the one hand, and the temperature of the generated hydrogen and oxygen is also increased on the other hand. Hydrogen auto-ignition, oxygen-assisted combustion, high concentration, high heat of hydrogen and oxygen are higher, and the present invention further provides a radiator 550 disposed in the second conduit 500 for cooling Hydrogen and oxygen generated by electrolysis. According to the principle of heat transfer, when the hydrogen and oxygen in the second line 500 are cooled, the heat of the hydrogen-oxygen electrolysis generating apparatus 100 is gradually led out by hydrogen and oxygen, and thus the temperature is also lowered.

The water washing bottle 700 of the hydrogen-oxygen supply machine 1 contains a large amount of water 720, and generally water is taken. The third line 800 is connected to the top of the electrolysis tank 200 and extends into the bottom of the water wash bottle 700, immersing in the water 720 of the water wash bottle 700. The third line 800 introduces hydrogen and oxygen gas in the electrolysis tank 200 and above the electrolyte 210 into the water 720 of the water bottle 700 for water washing. Due to the hydrogen and oxygen generated by electrolysis, it is inevitable that some impurities will be volatilized by the electrolyte. If it is not cleaned, it will be introduced into the engine inlet, which may adversely affect the components of the cylinder. By setting the water wash bottle 700, the hydrogen and oxygen can be purified and then exported, and the safety is high.

The top of the water washing bottle 700 further comprises an air outlet pipe 710, one end is arranged above the water surface, and the other end can be connected to the air inlet of the engine for guiding the purified hydrogen and oxygen to the air inlet of the engine. The high concentration of hydrogen and oxygen required to burn the engine.

The electrolysis water tank 200 further includes an airtight water tank cover 220 disposed at the top of the electrolysis water tank 200. When the airtight water tank cover 220 is opened, the electrolyte 210 can be replenished from the outside; when the airtight water tank cover 220 is closed, the airtight state of the electrolytic water tank 200 can be maintained, and the hydrogen and oxygen in the space above the electrolyte 210 can be prevented from leaking out. .

In this embodiment, preferably, an exhaust valve 230 that is switchable in an openable and closed state is connected to the upper portion of the electrolyte 210 of the electrolysis tank 200 for deliberately discharging hydrogen and oxygen in the electrolysis tank 200. When the exhaust valve 230 is in the open state, the electrolysis water tank 200 is electrically connected to the external environment, and the hydrogen and oxygen are discharged outward; when the exhaust valve 230 is in the closed state, the electrolysis water tank 200 is not conducted to the external environment, and the hydrogen and oxygen are kept in the electrolysis. Inside the water tank 200.

The exhaust valve 230 can be manually operated, but preferably, it can be electrically operated. row When the gas valve 230 is powered off, the electrolytic water tank 200 is turned on to the external environment; when the exhaust valve 230 is in a closed state when the power is turned on, the electrolytic water tank 200 is not electrically connected to the external environment.

The main purpose of the exhaust valve 230 is to maintain the safety of the electrolysis tank 200. If the hydrogen-oxygen supply unit 1 is powered on, it is ready to clean the engine cylinders. At this time, the exhaust valve 230 is in a closed state, and the electrolysis tank 200 is not electrically connected to the external environment. The hydrogen and oxygen generated by the electrolysis are accumulated in the upper portion of the electrolysis tank 200, and are discharged by the water washing bottle 700. When the cylinder cleaning is completed, the hydrogen-oxygen supply machine 1 is powered off, at which time the electrolysis of the hydrogen-oxygen electrolysis generating device 100 does not stop immediately, and the electrolytic reaction is slowly generated to continuously generate hydrogen and oxygen output, if the entire electrolysis tank 200 In a closed state, the internal gas pressure will continue to increase, which may have adverse effects. However, since the exhaust valve 230 of the present embodiment is in an open state after being powered off, the electrolyzed water tank 200 is electrically connected to the external environment, and the generated hydrogen gas and oxygen gas will slowly dissipate outward, and will not accumulate in the electrolysis water tank 200, and will not cause Danger.

In this embodiment, preferably, a variable frequency DC power supply 150 is included, and after the AC mains is connected, a specific voltage and a specific current can be output according to requirements and settings to provide the hydrogen oxygen supply 1 In particular, it is mainly the DC operating power required for the hydrogen-oxygen electrolysis generating device 100. The conventional conventional method uses a 24V DC battery and the power supply is fixed. Therefore, the design parameters of the hydrogen-oxygen electrolysis generating device 100 are severely restricted by the 24V DC battery, and it is difficult to adjust the hydrogen and oxygen generation efficiency. The variable frequency DC power supply 150 of the present invention can adjust the electrolysis efficiency by setting different direct current power to the hydrogen oxygen electrolysis generating device 100 to change the hydrogen and oxygen generation efficiency. The power output of the variable frequency DC power supply 150 has a DC positive pole 151 and a DC negative pole 152.

Referring to FIG. 2, in the embodiment, at least one positive electrode plate 111 and one negative electrode plate 112 are vertically disposed in the hydrogen-oxygen electrolysis generating device 100. The hydrogen-oxygen electrolysis generating device 100 is provided with an electrolyte 210. The liquid surface of the electrolyte 210 does not flood the positive electrode plate 111 and the negative electrode plate 112, and the positive electrode plate 111 is electrically charged. The negative electrode plate 112 is electrically connected to the DC negative electrode 152. When the DC power is applied, the hydrogen gas bubbles are collected on the negative electrode plate 112 by the electrolytic effect, and the oxygen gas bubbles are collected on the positive electrode plate 111.

Since the negative electrode plate 112 is gradually corroded by electrolysis, in order to improve the electrolysis efficiency, preferably, the hydrogen-oxygen electrolysis generating device 100 is vertically disposed with two negative electrode plates 112, and the positive electrode plate 111 is disposed between the two negative electrode plates 112. The positive electrode plate 111 is electrically connected to the direct current positive electrode 151, and the negative electrode plate 112 is electrically connected to the direct current negative electrode 152. Meanwhile, a plurality of electrolytic plates 113 are disposed more vertically between the positive electrode plate 111 and the negative electrode plate 112, but the electrolytic plate 113 does not need to be electrically connected to the direct current positive electrode 151 and the direct current negative electrode 152, as long as it is fixed to the positive electrode plate 111 and the negative electrode plate. Between the plates 112, the electrolyte 210 is immersed, and when the electrolysis occurs, the electrolytic plate 113 acts as a voltage ramp, while providing a large area for generating a large amount of hydrogen and oxygen. The side of the electrolytic plate 113 facing the positive electrode plate 111 collects bubbles of oxygen, and the side facing the negative electrode plate 112 collects bubbles of hydrogen gas.

In this embodiment, the number of electrolytic plates 113 is not limited, and may be more or less. Preferably, between each two adjacent electrolytic plates 113, between the positive electrode plates 111 and the electrolytic plates 113, and between the electrolytic plates 113 and the negative electrode plates 112. Each of them forms a pressure drop of 2V, which can achieve a better electrolysis effect. For example, if the voltage between the positive electrode plate 111 and the negative electrode plate 112 is 24V, 11 electrolytic plates 113 may be provided; if the voltage between the positive electrode plate 111 and the negative electrode plate 112 is 12V, five electrolytic plates 113 may be disposed; The rest of the way.

In this embodiment, the thickness of the positive electrode plate 111 and the negative electrode plate 112 is not less than 2 cm, particularly preferably 3 cm, and the area is approximately equal to the size of A4. If the area is further increased, the thickness is increased to increase the strength to avoid shaking in the electrolyte 210.

In this embodiment, the distance between two adjacent electrolytic plates 113 is 4 to 7 cm, particularly preferably 5 to 6 cm. The area of the electrolytic plate 113 is slightly smaller than that of the positive electrode plate 111 and the negative electrode plate 112, so the thickness can be slightly reduced, and the thickness is preferably 0.5 to 1 cm, particularly preferably 0.8 cm.

In the present embodiment, the positive electrode plate 111, the negative electrode plate 112, and the electrolytic plate 113 may be formed using a lead plate, a stainless steel plate, gold, platinum, aluminum alloy, graphite, or a copper alloy. Since the preferred electrolyte is a potassium hydroxide electrolyte, cost performance and durability are considered, and among them, stainless steel is preferable.

In this embodiment, the electrolyte 210 may include potassium hydroxide, sodium hydrogencarbonate, acetic acid, sulfuric acid, propylene carbonate, acetonitrile, ethylene glycol dimethyl ether, ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, and Diethyl carbonate or the like is preferred, but potassium hydroxide is preferred as the main electrolyte, because the potassium hydroxide electrolyte has an advantage of a large discharge current, and the electrolysis efficiency can be effectively improved. However, the concentration of potassium hydroxide contained in the electrolyte 210 should not be too high, preferably less than 10%; and if the concentration is less than 4%, the effect is not good. The solvent in the electrolyte 210 is water, preferably distilled water or pure water. It is not preferable to use tap water or mineral water because the minerals contained in the tap water or the mineral water easily form scale adhere to the positive electrode plate 111, the negative electrode plate 112, and the electrolytic plate 113. The contact area between the electrolyte 210 and the positive electrode plate 111, the negative electrode plate 112, and the electrolytic plate 113 is reduced, resulting in a decrease in electrolysis efficiency; if the scale is too severe, the electrolysis may be ineffective.

The method for purifying an engine cylinder proposed by the present invention firstly inserts a high-viscosity oil-preserving cylinder wall in the engine, and supplies a high-concentration hydrogen gas and oxygen through the hydrogen-oxygen supply machine 1, and introduces it into the engine air inlet to lift The combustion efficiency of the fuel in the engine further reaches complete combustion; let the engine idle for a period of time, the carbon deposit in the cylinder can be discharged by high-temperature combustion carbonization, thereby eliminating the need to use chemical solvents to achieve the effect of cleaning the cylinder . When the cylinder purification is completed, the fuel consumption of the engine can be further saved, the pollution is reduced, and the power is stronger.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The above description should be understood and implemented by those skilled in the relevant art, so that the other embodiments are not deviated from the spirit of the present invention. Equivalent changes or modifications made below shall be included in the scope of the patent application.

Claims (10)

A method for purifying an engine cylinder (900), comprising the following steps: 901: providing a high viscosity oil essence and a hydrogen oxygen supply machine (1), the hydrogen oxygen supply machine (1) having an air outlet pipe (710); 902: Pour the high viscosity oil concentrate into the engine; 903: introducing the gas outlet pipe (710) of the hydrogen oxygen supply machine (1) into the intake port of the engine; 904: starting the hydrogen oxygen supply machine (1) and the Engine 905: maintaining the engine idle for a preset time, the preset time is not less than 15 minutes; and 906: turning off the hydrogen oxygen supply (1) and the engine; wherein the hydrogen oxygen supply (1) comprises There is a hydrogen oxygen electrolysis generating device (100), an electrolysis water tank (200), a first pipeline (400), a second pipeline (500), an electrolyte pump (450), and a radiator (550). a third line (800), and a water wash bottle (700), the electrolysis water tank (200) is filled with an electrolyte (210) for electrolysis to generate hydrogen and oxygen, The first line (400) connects the electrolysis water tank (200) and the bottom of the hydrogen-oxygen electrolysis generating device (100) Nearby, for transporting the electrolyte (210), the second line (500) is connected to the hydrogen-oxygen electrolysis device (100) and the upper portion of the electrolysis tank (200) for transferring the generated hydrogen and oxygen, The electrolyte pump (450) is provided with the first pipeline (400), the radiator (550) is disposed in the second pipeline (500), and the third pipeline (800) is connected to the electrolysis water tank (200) The top portion extends into the bottom of the water wash bottle (700), and the top of the water wash bottle (700) further includes an air outlet tube (710). A method (900) for purifying an engine cylinder according to claim 2, wherein the hydrogen-oxygen supply (1) further comprises an electrically operated exhaust valve (230), the exhaust valve (230) being powered off The electrolysis tank (200) is turned on to the external environment in an open state; when the exhaust valve (230) is in a closed state upon power-on, the electrolysis tank (200) is not conducted to the external environment. The method (900) for purifying an engine cylinder according to claim 1, wherein the hydrogen-oxygen supply unit (1) further comprises a variable-frequency DC power supply (150) having a DC positive electrode (151) and a direct current. A negative electrode (152) to provide DC operating power of the hydrogen-oxygen supply (1). The method (900) for purifying an engine cylinder according to claim 3, wherein the hydrogen-oxygen electrolysis generating device (100) of the hydrogen-oxygen supply device (1) is provided with a positive electrode plate (111) and two negative electrode plates. (112), the positive plate (111) is disposed between the two negative plates (112), the positive plate (111) is electrically connected to the direct current positive electrode (151), and the negative plate (112) is electrically connected to The DC negative electrode (152). The method (900) for purifying an engine cylinder according to claim 4, wherein a plurality of electrolysis is disposed between the positive electrode plate (111) of the hydrogen-oxygen supply device (1) and the negative electrode plate (112) The plate (113), the electrolytic plate (113) is not electrically connected to the DC positive electrode (151) and the DC negative electrode (152). The method (900) for purifying an engine cylinder according to claim 5, wherein, in the hydrogen-oxygen supply (1), a distance between two adjacent ones of the electrolytic plates (113) is 4 to 7 cm. The method (900) for purifying an engine cylinder according to claim 1, wherein the electrolyte (210) of the hydrogen-oxygen supply (1) is a potassium hydroxide electrolyte, and the solvent of the electrolyte (210) is selected from the group consisting of A group consisting of pure water and distilled water. A method (900) for purifying an engine cylinder according to claim 7, wherein the hydrogen-oxygen supply unit (1) contains a concentration of potassium hydroxide of less than 10%. The method (900) for purifying an engine cylinder according to claim 5, wherein the positive electrode plate (111), the negative electrode plate (112) and the electrolytic plate (113) of the hydrogen-oxygen supply machine (1) are both stainless steel. And the thickness of the positive electrode plate (111) and the negative electrode plate (112) is not less than 2 cm. The method (900) for purifying an engine cylinder according to claim 9, wherein the electrolytic plate (112) of the hydrogen-oxygen supply (1) has a thickness of 0.5 to 1 cm.