Waste engine oil treatment and purification coupling system and process method of organic pyrolysis gas

Abstract

The application belongs to the coupling method and system of organic pyrolysis gas purification and waste engine oil treatment. The high-temperature flue gas produced by the combustion of oxygen and waste engine oil in the waste engine oil burner is sprayed into the high-temperature reforming gasifier; the pyrolysis gas to be purified from the organic pyrolyzer is mixed with steam in the high-temperature reforming gasifier to form a gas-steam mixture; the high-temperature flue gas provides high temperature for the series reactions of cracking, conversion and gasification, and purifies the tar, hydrocarbons and carbon particles in the pyrolysis gas. Advantages: waste engine oil incineration provides high-temperature flue gas, and the coupling of heat supply and demand in the high-temperature reforming gasifier makes the tar, hydrocarbons and carbon particles in the pyrolysis gas be purified, and the residual organic matter in the waste engine oil also cracks, converts and gasifies to be favorably applied; the pyrolysis gas is purified, the waste engine oil is treated, and the economic benefit is improved.

Description

Technical Field

[0001] This invention patent belongs to the technical field of waste oil treatment and organic pyrolysis gas purification. It relates to a process method that couples waste oil treatment with organic pyrolysis gas purification. Specifically, it describes a process method and system device in which waste oil is burned to provide heat for the purification process of tar, hydrocarbons and dust entrained in the pyrolysis gas, and to obtain high-quality organic pyrolysis gas. Background Technology

[0002] Various engineering machinery, factory operating equipment, automobiles, ships, airplanes, and trains generate a large amount of waste engine oil annually. Waste engine oil is generated in two ways: one is due to impurities such as water, dust, other mixed oils, and metal powder from machine wear during use; the other is due to the gradual deterioration of the engine oil, resulting in the formation of organic acids, gums, and asphalt-like substances. According to the National Hazardous Waste List, it is classified as HW08 waste mineral oil and mineral oil-containing waste, therefore requiring harmless treatment. Currently, the main methods of treatment are recycling and reducing it to finished engine oil or refining it into gasoline or diesel, and incineration.

[0003] Pyrolysis is the process by which organic components are heated to produce gaseous, liquid, and solid products under conditions of limited or complete oxygen supply or oxygen deficiency. Specifically, after the organic matter is heated to between 100°C and 200°C, surface moisture and adsorbed gases are released first. When the temperature rises to 200°C to 300°C, preliminary decomposition of the organic matter occurs, primarily through cracking reactions. When the temperature further rises to 300°C to 600°C, the decomposition reaction becomes more vigorous. If the temperature increases further, condensation polymerization becomes the dominant reaction. Organic matter undergoes pyrolysis and condensation chemical reactions through heating in three stages under low- or anaerobic conditions, generating pyrolysis steam, carbon monoxide, carbon dioxide, hydrogen, nitrogen, methane, gaseous hydrocarbons, and gaseous tar. This mixture is called the pyrolysis gas mixture. The carbon in the organic matter reacts with inorganic salts to form solid products after pyrolysis. These solid products are discharged from the bottom of the pyrolyzer and undergo further processing depending on the specific usage conditions. The mixed gas is discharged from the top of the pyrolyzer. Due to its high temperature, complex composition, and the presence of carbon particles, it must undergo heat recovery to reduce its temperature and be purified to remove tar, easily condensable hydrocarbons at room temperature, and particulate dust. Only clean pyrolysis gas can be used more effectively. Furthermore, the tar, condensed hydrocarbons, dust, and wastewater mixed with them generated during purification must be treated to ensure the stable, environmentally friendly, and safe operation of the pyrolysis unit.

[0004] The traditional method uses waste heat boilers, primary electrostatic precipitators, intercoolers, secondary electrostatic precipitators and their auxiliary equipment to cool the pyrolysis gas and remove tar, hydrocarbons and dust to achieve purification.

[0005] In recent years, the reduction of tar in pyrolysis gases has received widespread attention from domestic scholars. Patent CN 101100621A utilizes high-temperature cracking of tar in the gaseous products, combined with a dolomite catalyst and steam, to achieve cracking and reforming of the gaseous products. This cracking and reforming of the tar components into H2, CH4, and other light hydrocarbons increases the H2 content in the pyrolysis gas, producing hydrogen-rich fuel gas. Similar to patent CN 101100621A, patent CN 102220150 B also uses high-temperature cracking of tar, while utilizing CaO to absorb CO2 in the pyrolysis gas to produce high-quality fuel gas. Patent CN102329651 B employs a three-stage biomass pyrolysis gasification process to produce syngas, utilizing high temperature, a nickel-based catalyst, and steam to catalytically convert tar in the gaseous products, thereby improving the quality of the syngas. Patent CN107629819A describes a method that uses air combustion, indirect heating of flue gas as a heat source, and biochar catalysis to reduce tar and co-produce high-quality pyrolysis gas and biochar.

[0006] All of the above methods have the following drawbacks in actual operation:

[0007] Traditional methods for removing tar, easily condensable hydrocarbons at room temperature, and particulate dust from pyrolysis gas are prone to clogging and generating hazardous waste, harming the environment. These drawbacks are numerous and will not be elaborated upon here. Recent methods all involve consuming a certain amount of pyrolysis gas to increase its temperature. The heated pyrolysis gas then undergoes high-temperature cracking, conversion, catalytic reforming, and gasification to remove tar, easily condensable hydrocarbons, and particulate dust. The differences lie in the methods used to achieve the required temperature and the different catalysts employed. However, these methods also have the following drawbacks:

[0008] 1. Existing technologies can reduce tar and improve the quality of pyrolysis gas, but both require the addition of catalysts to the system. Catalysts are expensive and prone to deactivation, which increases the complexity of the process and production costs.

[0009] 2. Patent CN107629819A reduces tar in pyrolysis gas through catalytic reforming. The heat source for catalytic reforming is indirectly provided by air supplementation and flue gas heating, and the biochar in the pyrolysis process enters the catalytic reforming unit to play a catalytic role. The heat source for air supplementation and high-temperature flue gas is provided by the combustion of part of the pyrolysis gas, which consumes pyrolysis gas and increases operating costs. The nitrogen remaining after air supplementation combustion is introduced into the pyrolysis gas, which reduces the quality of the purified pyrolysis gas.

[0010] 3. Although waste engine oil can be recycled into finished engine oil or refined into gasoline and diesel, the process is complex, consumes a lot of steam, and generates some waste that harms the environment. In particular, waste engine oil with high impurity content and serious pollution is usually incinerated, but incomplete combustion can occur, polluting the environment. Summary of the Invention

[0011] The purpose of this invention is to utilize the heat released by burning waste engine oil with pure oxygen to provide the necessary heat for the purification, transformation, and gasification reactions of tar, hydrocarbons, dust, and residual organic matter from the combustion of waste engine oil in the pyrolysis gas. This process converts and gasifies the tar, hydrocarbons, dust, and residual organic matter from the combustion of waste engine oil into useful mixed gases such as carbon monoxide and hydrogen, thereby achieving the purpose of purifying the pyrolysis gas and residual organic matter from the combustion of waste engine oil. The invention also provides a method for purifying pyrolysis gas and the setup system used to implement this method.

[0012] The concept of this invention is to use the heat released from the combustion of waste engine oil with pure oxygen to provide the heat required for the chemical reaction that converts and gasifies the entrained tar, hydrocarbons, and dust in the pyrolysis gas into carbon monoxide and hydrogen. This also provides the heat required for the chemical reaction that converts and gasifies the residual organic matter in the waste engine oil into carbon monoxide and hydrogen. These two reforming processes increase the total amount of useful gases such as carbon monoxide and hydrogen. The useful gases produced by these two processes, along with the unreacted pyrolysis gas, are output as a mixed gas for subsequent user use. The increased production of useful gases in the mixed gas improves economic efficiency and also treats the waste engine oil.

[0013] Carbon monoxide and hydrogen in the mixed gas are important components of syngas, which are extremely valuable. They can be used as syngas or as high-quality fuel gas.

[0014] This invention harmlessly treats waste engine oil while obtaining carbon monoxide and hydrogen; simultaneously, it causes the tar and hydrocarbons in the pyrolysis gas to undergo a conversion reaction, and the carbon in the dust to undergo a gasification reaction, thus converting and gasifying the tar, hydrocarbons in the pyrolysis gas, and carbon in the dust into carbon monoxide and hydrogen. The two purification processes are carried out simultaneously, simplifying the process, saving unburned pyrolysis gas, and harmlessly utilizing waste engine oil.

[0015] In the waste oil harmless treatment of the present invention, the waste oil burns residual organic matter, and through conversion, gasification and other steps, it is converted into a mixed gas rich in carbon monoxide and hydrogen, which is mixed with pyrolysis gas and output. Carbon monoxide and hydrogen are important components of syngas with extremely high value and can be used as syngas or as high-quality fuel gas. Waste engine oil undergoes oxidation and combustion with pure oxygen, producing high-temperature flue gas that mixes with pyrolysis gas, raising the gas temperature inside the high-temperature reforming gasifier to 1150℃-1300℃. The residual organic matter from the combustion of the waste engine oil, the tar in the pyrolysis gas, and hydrocarbons undergo cracking at this high temperature. Simultaneously, at this high temperature, the residual organic matter from the combustion of the waste engine oil, tar, hydrocarbons, and carbon in the dust react with water vapor, transforming and gasifying them into carbon monoxide, carbon dioxide, and hydrogen. The inorganic salt mixture in the dust melts into crystalline particles at this high temperature.

[0016] The flue gas produced by combustion, along with carbon monoxide, carbon dioxide, and hydrogen generated by conversion and gasification, are mixed in the pyrolysis gas and then enter the subsequent heat recovery and cooling device.

[0017] Due to the increased density, the crystalline particles are deposited in the water seal pool in the high-temperature reforming gasifier and then discharged from the system.

[0018] The invention is summarized as follows:

[0019] The coupled process of waste oil treatment and purification of organic pyrolysis gas is characterized by: mixing oxygen with a concentration of more than 99% at room temperature and waste oil in a waste oil burner (3) and then burning it; the high-temperature flue gas generated by the combustion is injected into the lower part of the high-temperature reforming gasification furnace (4); the organic pyrolysis unit (2) inputs pyrolysis gas to be purified at 500°C into the high-temperature reforming gasification furnace (4); water vapor is also input into the high-temperature reforming gasification furnace (4); the high-temperature flue gas, the pyrolysis gas to be purified, and the water vapor are mixed in the high-temperature reforming gasification furnace (4) to produce a chemical reaction, which purifies the residual organic matter in the high-temperature flue gas and the pyrolysis gas to be purified.

[0020] Waste oil combustion: In the waste oil burner (3), waste oil and oxygen with a concentration of more than 99% burn and react to generate high temperature flue gas. The high temperature flue gas is injected into the lower part of the high temperature reforming gasifier (4), causing the temperature inside the high temperature reforming gasifier (4) to rise rapidly to 1150℃-1300℃. During the process of waste oil and oxygen combustion and heating up, in order to avoid the temperature inside the high temperature reforming gasifier (4) from exceeding 1300℃, water vapor is introduced into the high temperature reforming gasifier (4) to cool down, so that the temperature inside the high temperature reforming gasifier (4) is maintained at 1150℃-1300℃ and does not exceed 1300℃.

[0021] Coupled heat supply for cracking, conversion, and gasification reactions: In the high-temperature reforming gasifier (4), waste oil and oxygen are burned in the waste oil burner (3) to generate high-temperature flue gas which is injected into the high-temperature reforming gasifier (4). During the heating process of the high-temperature reforming gasifier (4), the residual organic matter from the combustion of waste oil, the tar in the pyrolysis gas, and long hydrocarbons are cracked into low-boiling-point short hydrocarbons. Finally, the tar, long-chain hydrocarbons, carbon in the dust, and water vapor in the pyrolysis gas are converted and gasified to produce carbon monoxide and hydrogen. In addition, in the high-temperature reforming gasifier (4), the residual organic matter from the combustion of waste oil is converted and gasified to produce carbon monoxide and hydrogen. The carbon monoxide and hydrogen produced by these two purification processes are mixed with other components of the original pyrolysis gas in the high-temperature reforming gasifier (4) to form high-temperature purified gas, which is discharged from the top of the high-temperature reforming gasifier (4) and enters the waste heat recovery unit (6).

[0022] High-temperature purified gas cooling: In the waste heat recovery unit (6), the high-temperature purified gas is cooled by the softened water from the softened water storage tank (8) to become medium-temperature purified gas. The softened water in the waste heat recovery unit (6) is heated and turns into water vapor, which is then introduced into the lower part of the high-temperature reforming gasification furnace (4) to cool the contents of the high-temperature reforming gasification furnace (4) and participate in the various reforming reactions. The excess portion of the softened water in the waste heat recovery unit (6) is sent to the water vapor main pipe (7). The medium-temperature purified gas discharged from the waste heat recovery unit (6) is introduced into the intercooler (9). In the intercooler (9), the medium-temperature purified gas is cooled by the ambient temperature circulating water of the circulating cooling water station (10) to become ambient temperature purified gas. The ambient temperature purified gas is then sent to the purified gas compressor (11) for pressurization and then sent to the purified gas user (12) for use.

[0023] In the above-mentioned coupled process of waste oil treatment and purification of organic pyrolysis gas, the specific reaction equations are as follows:

[0024] The combustion reaction equation is: CmHn + (m+n / 4)O2= mCO2+(n / 2)H2O+Q, the reaction releases heat and produces high-temperature flue gas; CmHn in this equation represents waste engine oil;

[0025] The conversion reaction equation is: CmHn + mH2O = mCO + (n / 2 + m)2H2-Q, which absorbs heat. In this equation, CmHn represents tar and hydrocarbons in the pyrolysis gas, and CmHn also represents the residual organic matter from the combustion of waste engine oil.

[0026] The gasification reaction equation is: C + H2O = CO + H2, where "C" represents the carbon in the dust and the carbon produced by the cracking of residual organic matter from the combustion of tar, hydrocarbons, and waste oil.

[0027] The waste oil treatment and organic pyrolysis gas purification coupling system used in the above-described purification coupling process is characterized in that: the main devices that the pyrolysis gas to be purified passes through to become purified room temperature gas delivered to the user through the purification coupling system are, in sequence: organic pyrolysis unit (2), high temperature reforming gasifier (4), waste heat recovery unit (6), intercooler (9), purified gas compressor (11), and purified gas user (12); the specific connection relationship of all devices in the system is as follows:

[0028] The outlet pipe of the organic pyrolysis unit (2) and the steam outlet pipe of the waste heat recovery unit (6) are respectively connected to the high-temperature reforming gasification furnace (4) below, so that the pyrolysis gas and water vapor to be purified are introduced into the lower part of the high-temperature reforming gasification furnace (4); the oxygen storage tank (1) and the waste oil storage tank (14) are connected to the inlet of the waste oil burner (3), and the flue gas outlet of the waste oil burner (3) is connected to the high-temperature reforming gasification furnace (4), so that the high-temperature flue gas is introduced into the high-temperature reforming gasification furnace (4); the lowest end of the high-temperature reforming gasification furnace (4) is connected to the water seal pool (5), and the water seal pool (5) stores the slag after the reaction in the high-temperature reforming gasification furnace (4);

[0029] The top of the high-temperature reforming gasifier (4) is connected to the waste heat recovery unit (6), which in turn is connected to the softened water storage tank (8). The softened water storage tank (8) inputs softened water into the waste heat recovery unit (6). The top of the high-temperature reforming gasifier (4) sends high-temperature purified gas to the waste heat recovery unit (6) where the softened water input from the softened water storage tank (8) is cooled into medium-temperature purified gas. The softened water is heated into steam and then sent from the waste heat recovery unit (6) to the high-temperature reforming gasifier (4) to supply purified pyrolysis gas and residual organic matter from the combustion of waste oil. Excess steam is sent from the waste heat recovery unit (6) to the steam main pipe (7) for external supply.

[0030] The medium-temperature purified gas output pipe of the waste heat recovery unit (6) is connected to the intercooler (9). The waste heat recovery unit (6) delivers the medium-temperature purified gas to the intercooler (9) to cool it down to normal temperature purified gas. The normal temperature purified gas output pipe of the intercooler (9) is connected to the purified gas compressor (11). The normal temperature purified gas is pressurized by the purified gas compressor (11) into high-pressure normal temperature purified gas and delivered to the purified gas user (12) through the output pipe.

[0031] In the waste oil treatment and organic pyrolysis gas purification coupling system, the intercooler (9) is also connected to the circulating cooling water station (10), and cooling water circulates between the intercooler (9) and the circulating cooling water station (10).

[0032] In the waste oil treatment and organic pyrolysis gas purification coupling system, the condensate pipe below the intercooler (9) is connected to the condensate circulation washing pump (9-2), and the condensate circulation washing pump (9-2) sends the condensate into the condensate storage tank (9-3); a condensate external supply regulating valve (9-3-1) is provided on the pipeline connecting the condensate circulation washing pump (9-2) and the condensate sent into the condensate storage tank (9-3). The condensate level gauge (9-3-2) in the intercooler (9) is connected to the condensate external supply regulating valve (9-3-1), and the condensate level signal in the intercooler (9) controls the condensate external supply regulating valve (9-3-1).

[0033] The waste oil treatment and organic pyrolysis gas purification coupling system also includes a controller (13), a temperature measuring device (4-1T), an oxygen flow regulator (1-1), a pyrolysis gas flow meter (2-1), a steam flow regulator (7-1), and a waste oil flow regulator (14-1). The controller (13) is connected to the temperature measuring device (4-1T), which is located at the upper part of the high-temperature reforming gasifier (4). The controller (13) receives the temperature signal from the temperature measuring device (4-1T) inside the high-temperature reforming gasifier (4). The controller (13) is also connected to the oxygen flow regulator (1-1), the pyrolysis gas flow meter (2-1), the steam flow regulator (7-1), and the waste oil flow regulator (14-1).

[0034] The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of oxygen entering the waste oil burner (3) through the oxygen flow regulator (1-1) and adjust the temperature inside the high-temperature reforming gasifier (4);

[0035] The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of steam entering the high-temperature reforming gasifier (4) through the steam flow regulator (7-1) and adjust the temperature inside the high-temperature reforming gasifier (4);

[0036] The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of waste oil entering the waste oil burner (3) through the waste oil flow regulator (14-1), thereby regulating the temperature inside the high-temperature reforming gasifier (4).

[0037] The production process of the above method and the purification coupling system is described below:

[0038] Waste oil from waste oil storage tank 14 enters waste oil burner 3. Oxygen from oxygen storage tank 1 has a concentration greater than 99% [all oxygen added below refers to oxygen concentration greater than 99%]. The oxygen enters waste oil burner 3, and the waste oil and oxygen with a concentration of 99% or more burn in the burner to produce high-temperature flue gas which is injected into high-temperature reforming gasifier 4, causing the temperature of the pyrolysis gas to rise rapidly to 1150℃-1300℃. During the heating process, in order to control the oxidation temperature and meet the conversion and gasification reactions and prevent overheating, water vapor needs to be added to high-temperature reforming gasifier 4 at the same time. The water vapor has a cooling effect (firstly, the low enthalpy of water vapor itself can effectively cool down the temperature, and secondly, water vapor participates in the conversion and gasification reactions, both of which are endothermic reactions, thus also playing a cooling role).

[0039] A key feature of this invention is that during the temperature rise process of burning waste engine oil, the residual organic matter from the combustion of waste engine oil, tar in the pyrolysis gas, and long hydrocarbons are converted into low-boiling-point short hydrocarbons, which become useful gases. Furthermore, during the temperature rise of the pyrolysis gas, the residual organic matter from the combustion of waste engine oil, tar, long-chain hydrocarbons, and carbon in the dust undergo transformation and gasification reactions with water vapor to produce carbon monoxide and hydrogen, which also become useful gases. This results in a higher concentration of useful gases in the high-temperature purified gas output from the high-temperature reforming gasifier 4, increasing economic benefits while also harmlessly treating the waste engine oil.

[0040] The pyrolysis gas from the organic pyrolysis unit 2 is metered by the pyrolysis gas flow meter 2-1 and then enters the high-temperature reforming gasification furnace 4. After receiving the metering data from the pyrolysis gas flow meter 2-1, the controller 13 calculates the amount of waste oil to be added [the actual amount depends on the calorific value of the waste oil], and outputs the waste oil quantity to the waste oil flow regulator 14-1. The waste oil flow regulator 14-1 controls the waste oil flow rate, and the waste oil from the waste oil storage tank 14 enters the waste oil burner 3 through the waste oil flow regulator 14-1. Simultaneously, the waste oil quantity is transmitted to the oxygen flow regulator 1-1, which controls the oxygen flow rate, and the oxygen from the oxygen storage tank 1 enters the waste oil burner 3 through the oxygen flow regulator 1-1. The waste oil and oxygen burn in the waste oil burner 3 to produce high-temperature flue gas. The combustion equation for waste oil and oxygen is: CmHn +(m+n / 4)O2=mCO2+(n / 2)H2O+Q, the reaction releases heat and produces high-temperature flue gas; in the formula, CmHn represents waste oil and +Q represents the heat added.

[0041] The high-temperature flue gas ejected from the waste oil burner (3) enters the high-temperature reforming gasifier 4. The pyrolysis gas, which is about 500°C after being measured by the pyrolysis gas flow meter 2-1, also enters the high-temperature reforming gasifier 4. The high-temperature flue gas and the 500°C pyrolysis gas are fully mixed in the high-temperature reforming gasifier 4. The temperature inside the high-temperature reforming gasifier 4 rises rapidly. The temperature measuring device 4-1T set in the upper part of the high-temperature reforming gasifier 4 measures the temperature inside the high-temperature reforming gasifier 4 and transmits the measured temperature to the controller 13. The controller 13 receives the temperature from the temperature measuring device 4-1T. After receiving the data, the system transmits the adjustment information to the steam flow regulator 7-1 according to the temperature data set by the system (1150℃-1300℃). The steam in the steam main pipe 7 is regulated by the steam flow regulator 7-1 and enters the lower part of the high-temperature reforming gasifier 4. The steam is controlled between 1150℃ and 1300℃ by utilizing the low heat property of water vapor and the fact that water vapor participates in the conversion and gasification endothermic reaction to reduce the temperature. [During the initial startup, the steam in the steam main pipe 7 is supplied by an external device for startup use.] Since the pyrolysis gas itself contains water vapor, and the waste oil combustion reaction generates water vapor, and the high-temperature reforming gasifier 4 is supplemented with a certain amount of water vapor through the water vapor flow regulator 7-1 to regulate the temperature, the residual organic matter in the waste oil that has not been completely burned reacts with the tar, hydrocarbons, and methane in the pyrolysis gas and water vapor during the temperature rise process. The main reaction equation for the conversion is: CmHn + mH2O = mCO + (n / 2 + m)2H2 - Q, where CmHn represents the residual organic matter in the pyrolysis gas that has not been completely burned, and -Q represents the heat absorbed. The conversion reaction absorbs heat, while the preceding waste oil oxidation reaction releases heat. This heat release from the preceding oxidation reaction provides the necessary heat and high temperature for the subsequent conversion reaction to absorb heat. Because the waste oil combustion oxidation reaction is rapid, the temperature rises first, and then decreases as the reduction reaction proceeds. When the temperature measuring device 4-1T detects a temperature higher than the set value of 1150℃-1300℃, the amount of steam added through the steam flow regulator 7-1 is increased to ensure that the temperature does not exceed 1300℃. In the high-temperature reforming gasifier, due to the increase in temperature, the carbon-containing particles in the dust entrained in the pyrolysis gas undergo a gasification reaction with water vapor: C + H2O = CO + H2. The carbon in the dust is converted into carbon monoxide through a gasification reaction. The remaining inorganic salts in the dust are mostly a mixture of salts of silicon, aluminum, calcium, magnesium, and iron. At 1150℃-1300℃, the melting point of the mixed inorganic salts is reached, and they are in a molten state. The molten crystals stick together and grow into large particles with increased specific gravity. They sink into the water seal pool 5 below the high-temperature reforming gasifier in the rising pyrolysis gas and flue gas mixture. They are periodically removed and discharged from the system as inorganic lumps with low pollution. In the high-temperature reforming gasifier 4, reforming, conversion, and gasification reactions occur, and a large amount of the residual organic matter that is not completely burned in the waste oil and the tar, hydrocarbons, and dust in the pyrolysis gas can be removed.

[0042] The high-temperature purified gas (1150℃-1300℃) exiting the high-temperature reforming gasifier 4 enters the waste heat recovery unit 6. Softened water from a storage tank 8 is added to the coil 6-1 in the waste heat recovery unit 6 to soften the water, which exchanges heat with the pyrolysis gas outside the coil (1150℃-1300℃). The softened water in coil 6-1 is heated to produce steam, which enters the steam main 7. The temperature of the high-temperature purified gas outside coil 6-1 is reduced to 180℃. The 180℃ medium-temperature purified gas then enters the cooling tubes 9-1 in the intercooler 9 from the waste heat recovery unit 6. Cold circulating water from the circulating cooling water station 10 enters the space between the tubes of cooling tubes 9-1. The 180℃ medium-temperature purified gas inside cooling tubes 9-1 is cooled to room temperature by the cold circulating water in the space between the tubes of cooling tubes 9-1. After heat exchange, the cold circulating water in the space between the tubes of cooling tubes 9-1 exits as hot circulating water and returns to the circulating cooling water station 10. After cooling, the gas is recycled. The condensate generated during the cooling process of the pyrolysis gas is separated in the lower part of the intercooler 9, forming a certain liquid level. It is then sent into the cooling tubes 9-1 inside the intercooler 9 via the condensate circulation washing pump 9-2 to flush the inner wall of the cooling tubes 9-1 and prevent blockage. The condensate level gauge 9-3-2 displays the condensate level in the lower part of the intercooler 9. When the level exceeds the set value of the condensate level gauge 9-3-2, a signal is given to control the opening of the condensate delivery regulating valve 9-3-1. The excess condensate is then sent to the condensate storage tank 9-3 via the condensate circulation washing pump 9-2 and the condensate delivery regulating valve 9-3-1, and periodically discharged to the sewage treatment system for treatment. The purified gas that has been cooled to room temperature from the intercooler 9 goes to the pressurizing fan 11 and is pressurized to the pressure required by the user. The purified gas with qualified delivery pressure and impurities is then delivered to the pyrolysis gas user 12 for use.

[0043] In the pyrolysis gas purification method, the waste engine oil and added oxygen are oxidized and burned in the above steps to generate high-temperature flue gas which enters the lower part of the high-temperature reforming gasification furnace. At the same time, the pyrolysis gas to be purified enters the lower part of the high-temperature pyrolysis furnace, so that the two gases with a large temperature difference, the high-temperature flue gas and the pyrolysis gas to be purified, have a certain space to gradually mix, preventing the reaction from being too violent. The temperature of the pyrolysis gas to be purified, mixed with high-temperature flue gas, rapidly rises to 1150℃-1300℃. The upper temperature limit is controlled to not exceed 1300℃ by supplementing with steam. This helps to control the upper temperature limit in the high-temperature reforming gasifier to not exceed 1300℃. Due to the temperature increase, the unburned residual organic matter in the waste oil undergoes an endothermic conversion reaction with the tar and hydrocarbons in the pyrolysis gas, removing the unburned residual organic matter, tar, and hydrocarbon impurities from the waste oil and generating useful gases. In the above method, the carbon in the carbon-containing dust entrained in the pyrolysis gas undergoes a gasification reaction at high temperature to generate carbon monoxide and hydrogen, while the remaining inorganic salts form molten crystal particles and are discharged. The tar, hydrocarbons, and entrained dust in the pyrolysis gas are removed after passing through the high-temperature reforming gasifier and are largely converted into useful gases. This increases the content of useful gases in the pyrolysis gas output from the high-temperature reforming gasifier, improves economic efficiency, and harmlessly treats the waste oil.

[0044] After adopting the above technical solution, the effects and advantages of the present invention are as follows:

[0045] 1. Coupled heat supply for the pyrolysis, conversion, and gasification purification reactions, enabling these reactions to reach high temperatures of 1150-1300℃: The heat released from the combustion of waste engine oil provides the necessary heat for the tar, hydrocarbons, and dust in the pyrolysis gas to undergo conversion and gasification purification reactions under high-temperature conditions. This coupled heat supply and demand achieves the harmless treatment of waste engine oil. This invention utilizes the heat released from the combustion of waste engine oil and pure oxygen to generate high-temperature flue gas, rapidly raising the temperature of the pyrolysis gas to 1150℃-1300℃; providing the high-temperature heat required for the pyrolysis, conversion, and gasification treatment of tar, hydrocarbons, and dust in the pyrolysis gas. Because the combustion of waste engine oil provides high temperatures, the tar, hydrocarbons, and dust in the pyrolysis gas from the cracking, conversion, and gasification processes no longer need to be heated by burning the pyrolysis gas. This avoids wasting the pyrolysis gas by burning it to provide high temperatures for the cracking, conversion, and gasification processes, while achieving the harmless treatment of waste engine oil. The process saves pyrolysis gas and converts some waste engine oil into usable gas in one step, increasing economic benefits.

[0046] 2. High-quality utilization of waste engine oil: There are residual organic matter from waste engine oil in the high-temperature flue gas. This residual organic matter can also be converted into a mixed gas rich in carbon monoxide and hydrogen through high-temperature reforming, conversion and gasification, which can be used as a raw material for syngas or fuel gas, thereby realizing the high-quality utilization of waste engine oil, improving the value of waste engine oil treatment, and avoiding the pollution of the environment caused by residual organic matter generated by burning waste engine oil alone.

[0047] 3. No expensive catalyst required: Due to the use of waste oil combustion, the heat supply is sufficient, and it is easy to achieve high temperature conditions of 1150℃-1300℃. Under these high temperature conditions, the conversion and gasification reactions of tar, hydrocarbons and dust in the pyrolysis gas to be purified are rapid and thorough, without the need for expensive catalysts and complex catalytic systems, thus reducing the economic cost and operating expenses of removing tar, hydrocarbons and dust from the pyrolysis gas.

[0048] 4. Low and high quality of inert gas nitrogen: Since all heat is supplied by combustion of oxygen with a concentration greater than 99%, very little inert gas nitrogen is introduced. The purified pyrolysis gas has a higher quality and can be used as syngas or high-quality fuel gas.

[0049] 5. Removal of inorganic salts from dust: The high-temperature reforming gasifier reaches temperatures of 1150℃-1300℃, which can remove a large amount of tar, hydrocarbons, and entrained dust from the pyrolysis gas and convert them into carbon monoxide and hydrogen. Inorganic salts in the dust form molten crystal particles and are discharged. This coupled purification process has high purification efficiency.

[0050] 6. Waste heat boilers are less prone to clogging: After the pyrolysis gas is processed in a high-temperature reforming gasifier, a large amount of tar, hydrocarbons and dust impurities are removed, which solves the problems of clogging and wear in the subsequent waste heat boilers.

[0051] 7. The purification process is simplified and requires fewer setups compared to existing technologies: After the pyrolysis gas is processed in a high-temperature reforming gasifier, tar, hydrocarbons, and dust impurities are removed, eliminating the need for primary and secondary electrostatic precipitators, thus simplifying the pyrolysis gas purification process. Furthermore, since the original primary and secondary electrostatic precipitators had extremely strict requirements on oxygen content and were prone to explosion accidents, eliminating this hazard by removing them makes the pyrolysis gas purification system safer.

[0052] 8. Cooler is not prone to clogging: After the pyrolysis gas is processed by the high-temperature reforming gasifier, tar, hydrocarbons and dust impurities are removed. The subsequent cooling indirect cooler is not prone to clogging, the heat exchange efficiency is improved, and it is more conducive to the stable operation of the pyrolysis gas purification process.

[0053] 9. Reduced dust volume and easy removal: The dust carried in the pyrolysis gas undergoes a gasification reaction at high temperature to produce carbon monoxide and hydrogen. The remaining inorganic salts form molten crystal particles with a specific gravity two to three times higher than that of the dust, which changes the physical properties of the dust and facilitates subsequent treatment. It can be directly landfilled or used for road paving without polluting the environment.

[0054] 10. Less tar and dust mixture than existing technologies: Tar, hydrocarbons and entrained dust in pyrolysis gas are removed by a high-temperature reforming gasifier. Subsequent heat recovery and cooling processes do not generate tar, dust and their mixtures, reducing the environmental pollution caused by tar, dust and their mixtures generated in traditional pyrolysis gas purification processes, and promoting cleaner production.

[0055] 11. Reduced environmental toxicity in condensate: Tar, hydrocarbons, and entrained dust in pyrolysis gas are removed by a high-temperature reforming gasifier. The tar, hydrocarbons, and dust impurities in the condensate produced during the cooling process of pyrolysis gas are reduced, thus weakening the environmental toxicity of this condensate, making it easier to treat, reducing treatment costs, and being more conducive to environmental protection. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the structure of each setting and connection system of the present invention;

[0057] In the diagram, 1 is an oxygen storage tank, 2 is an organic pyrolyzer, 3 is a waste oil burner, 4 is a high-temperature reforming gasifier, 5 is a water seal pool, 6 is a waste heat recovery unit, 7 is a steam main, 8 is a softened water storage tank, 9 is an intercooler, 10 is a circulating cooling water station, 11 is a pyrolysis gas compressor, 12 is a pyrolysis gas user, 13 is a controller, and 14 is a waste oil storage tank.

[0058] In the diagram, 1-1 is the oxygen flow regulator, 2-1 is the pyrolysis gas flow meter, 6-1 is the cooling coil, 7-1 is the steam flow regulator, 9-1 is the cooling tube, 9-2 is the condensate circulating washing pump, 9-3 is the condensate storage tank, 9-3-1 is the condensate external supply regulating valve, 9-3-2 is the condensate level gauge, 14-1 is the waste oil flow regulator, and 4-1T is the temperature measuring device. Detailed Implementation

[0059] Example 1: Coupled system and process for waste oil treatment and purification of organic pyrolysis gas

[0060] like Figure 1The process of coupling waste oil treatment with purification of organic pyrolysis gas involves mixing oxygen at a concentration of over 99% at room temperature with waste oil in a waste oil burner (3) and then burning it. The high-temperature flue gas generated by the combustion is injected into the lower part of the high-temperature reforming gasifier (4). The organic pyrolysis unit (2) inputs pyrolysis gas to be purified at around 500°C into the high-temperature reforming gasifier (4). Water vapor is also input into the high-temperature reforming gasifier (4). The high-temperature flue gas, the pyrolysis gas to be purified, and the water vapor are mixed in the high-temperature reforming gasifier (4) to produce a chemical reaction, which purifies the residual organic matter in the high-temperature flue gas and the pyrolysis gas to be purified.

[0061] Waste oil combustion: In the waste oil burner (3), waste oil and oxygen with a concentration of more than 99% burn in the burner to generate high-temperature flue gas. The high-temperature flue gas is injected into the lower part of the high-temperature reforming gasifier (4), causing the temperature inside the high-temperature reforming gasifier (4) to rise rapidly to 1150℃-1300℃. During the process of waste oil and oxygen combustion and heating up, in order to avoid the temperature inside the high-temperature reforming gasifier (4) from rising above 1300℃, water vapor is introduced into the high-temperature reforming gasifier (4) to cool it down, so that the temperature inside the high-temperature reforming gasifier (4) is maintained at 1150℃-1300℃ and does not exceed 1300℃. The high-temperature flue gas and water vapor are used to control the temperature inside the high-temperature reforming gasifier (4) at 1150℃-1300℃, providing the most suitable temperature conditions for cracking, conversion reaction and gasification reaction.

[0062] Coupled heat supply for cracking, conversion, and gasification reactions: In the high-temperature reforming gasifier (4), waste oil and oxygen are burned in the waste oil burner (3) to generate high-temperature flue gas which is injected into the high-temperature reforming gasifier (4). During the heating process of the high-temperature reforming gasifier (4), the residual organic matter from the combustion of waste oil, the tar in the pyrolysis gas, and long hydrocarbons are cracked into low-boiling-point short hydrocarbons. Finally, the tar, long-chain hydrocarbons, carbon in the dust, and water vapor in the pyrolysis gas are converted and gasified to produce carbon monoxide and hydrogen. In addition, in the high-temperature reforming gasifier (4), the residual organic matter from the combustion of waste oil is converted and gasified to produce carbon monoxide and hydrogen. The carbon monoxide and hydrogen produced by these two purification processes are mixed with other components of the original pyrolysis gas in the high-temperature reforming gasifier (4) to form high-temperature purified gas, which is discharged from the top of the high-temperature reforming gasifier (4) and enters the waste heat recovery unit (6).

[0063] High-temperature purified gas cooling: In the waste heat recovery unit (6), the high-temperature purified gas at 1150℃-1300℃ is cooled by softened water from the softened water storage tank (8) to become medium-temperature purified gas at about 180℃. The softened water in the waste heat recovery unit (6) is heated and turned into water vapor, which is then reintroduced into the lower part of the high-temperature reforming gasifier (4) to cool the contents of the high-temperature reforming gasifier (4) and participate in the various reforming reactions; the softened water in the waste heat recovery unit (6) When too much water vapor is heated, the excess water vapor is sent to the water vapor main pipe (7); the medium-temperature purified gas of about 180°C discharged from the waste heat recovery unit (6) is introduced into the intercooler (9). In the intercooler (9), the medium-temperature purified gas of about 180°C is cooled by the ambient temperature circulating water of the circulating cooling water station (10) to become ambient temperature purified gas. The ambient temperature purified gas is sent to the purified gas pressurizer (11) for pressurization and then sent to the purified gas user (12) for use.

[0064] The reactions in the coupled reforming process include at least the following chemical reactions:

[0065] The combustion reaction equation is: mHn + (m + n / 4)O2 = mCO2 + (n / 2)H2O + Q. The reaction releases heat and produces high-temperature flue gas. In this equation, CmHn represents waste engine oil.

[0066] The conversion reaction equation is: CmHn + mH2O = mCO + (n / 2 + m)2H2 - Q, which absorbs heat. In this equation, CmHn represents tar and hydrocarbons in the pyrolysis gas, and CmHn also represents the residual organic matter from the combustion of waste engine oil.

[0067] The gasification reaction equation is: C + H2O = CO + H2, where "C" represents the carbon in the dust and the carbon produced by the cracking of residual organic matter from the combustion of tar, hydrocarbons, and waste oil.

[0068] In the high-temperature reforming gasifier 4, due to the increased temperature, the dust entrained in the pyrolysis gas to be purified contains carbon particles. The carbon particles react with water vapor in a gasification reaction: C + H2O = CO + H2. The carbon in the dust is converted into carbon monoxide by the gasification reaction. The remaining inorganic salts in the dust are mostly a mixture of silicon, aluminum, calcium, magnesium, and iron salts. At 1150℃-1300℃, the melting point of the mixed inorganic salts has been reached, and they are in a molten state. The molten crystals stick together and grow into large particles with increased specific gravity. They sink into the water seal pool 5 below the high-temperature reforming gasifier. The slag in the water seal pool 5 only needs to be removed periodically.

[0069] The system consisting of multiple devices used for waste oil treatment and pyrolysis gas purification to achieve the above process is as follows:

[0070] The main devices that the pyrolysis gas to be purified passes through in the purification coupling system to become purified room temperature gas delivered to users are: organic pyrolysis unit (2), high temperature reforming gasifier (4), waste heat recovery unit (6), intercooler (9), purified gas compressor (11), and purified gas user (12); the specific connection relationship of all devices in the system is as follows:

[0071] The organic pyrolysis device (2) described in this invention refers to a device in the present technology that places organic matter under high temperature and oxygen-deficient conditions to decompose organic matter into pyrolysis gas.

[0072] The high-temperature reforming gasifier (4) described in this invention is a gasifier that can withstand temperatures above 1300℃. In this invention, it is used for the purification of pyrolysis gas and residual organic matter in waste oil.

[0073] The waste heat recovery device (6) described in this invention is a heat exchanger that can withstand temperatures up to 1300℃ and can cool high-temperature purified gas at 1150℃-1300℃ to about 180℃.

[0074] The intercooler (9) described in this invention is a heat exchanger that can withstand temperatures up to 200°C and can cool medium-temperature purified gas at around 180°C to room temperature.

[0075] The purified gas compressor (11) described in this invention is a common type of air compressor.

[0076] The waste oil burner (3) of the present invention is designed to withstand the combustion of waste oil and oxygen with a concentration of more than 99% inside, producing high-temperature flue gas, and the high-temperature flue gas produced by combustion can be ejected.

[0077] The outlet pipe of the organic pyrolysis unit (2) and the steam outlet pipe of the waste heat recovery unit (6) are respectively connected to the high-temperature reforming gasification furnace (4) below, so that the pyrolysis gas and water vapor to be purified are introduced into the lower part of the high-temperature reforming gasification furnace (4); the oxygen storage tank (1) and the waste oil storage tank (14) are connected to the inlet of the waste oil burner (3), and the flue gas outlet of the waste oil burner (3) is connected to the high-temperature reforming gasification furnace (4), so that the high-temperature flue gas is introduced into the high-temperature reforming gasification furnace (4); the lowest end of the high-temperature reforming gasification furnace (4) is connected to the water seal pool (5), and the water seal pool (5) stores the slag after the reaction in the high-temperature reforming gasification furnace (4);

[0078] The top of the high-temperature reforming gasifier (4) is connected to the waste heat recovery unit (6), which in turn is connected to the softened water storage tank (8). The softened water storage tank (8) inputs softened water into the waste heat recovery unit (6). The top of the high-temperature reforming gasifier (4) sends high-temperature purified gas to the waste heat recovery unit (6) where the softened water input from the softened water storage tank (8) is cooled into medium-temperature purified gas. The softened water is heated into steam and then sent from the waste heat recovery unit (6) to the high-temperature reforming gasifier (4) to supply purified pyrolysis gas and residual organic matter from the combustion of waste oil. Excess steam is sent from the waste heat recovery unit (6) to the steam main pipe (7) for external supply.

[0079] The medium-temperature purified gas output pipe of the waste heat recovery unit (6) is connected to the intercooler (9). The waste heat recovery unit (6) delivers the medium-temperature purified gas to the intercooler (9) to cool it down to normal temperature purified gas. The low-temperature purified gas output pipe of the intercooler (9) is connected to the purified gas compressor (11). The normal temperature purified gas is pressurized by the purified gas compressor (11) into high-pressure normal temperature purified gas and delivered to the purified gas user (12) through the output pipe.

[0080] The intercooler (9) is also connected to the circulating cooling water station (10), and cooling water circulates between the intercooler (9) and the circulating cooling water station (10).

[0081] The condensate pipe below the intercooler (9) is connected to the condensate circulation washing pump (9-2), which sends the condensate into the condensate storage tank (9-3). A condensate delivery regulating valve (9-3-1) is installed on the pipe connecting the condensate circulation washing pump (9-2) and the condensate into the condensate storage tank (9-3). The condensate level gauge (9-3-2) in the intercooler (9) is connected to the condensate delivery regulating valve (9-3-1), and the condensate level signal in the intercooler (9) controls the condensate delivery regulating valve (9-3-1).

[0082] The waste oil treatment and organic pyrolysis gas purification coupling system also includes a controller (13), a temperature measuring device (4-1T), an oxygen flow regulator (1-1), a pyrolysis gas flow meter (2-1), a steam flow regulator (7-1), and a waste oil flow regulator (14-1). The controller (13) is connected to the temperature measuring device (4-1T), which is located at the upper part of the high-temperature reforming gasifier (4). The controller (13) receives the temperature signal from the temperature measuring device (4-1T) inside the high-temperature reforming gasifier (4). The controller (13) is also connected to the oxygen flow regulator (1-1), the pyrolysis gas flow meter (2-1), the steam flow regulator (7-1), and the waste oil flow regulator (14-1).

[0083] The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of oxygen entering the high-temperature reforming gasifier (4) through the oxygen flow regulator (1-1) and adjust the temperature inside the high-temperature reforming gasifier (4);

[0084] The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of steam entering the high-temperature reforming gasifier (4) through the steam flow regulator (7-1) and adjust the temperature inside the high-temperature reforming gasifier (4);

[0085] The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of waste oil entering the waste oil burner (3) through the waste oil flow regulator (14-1), thereby regulating the temperature inside the high-temperature reforming gasifier (4).

Claims

1. A coupled process method for waste oil treatment and purification of organic pyrolysis gas, characterized in that: Oxygen with a concentration of over 99% at room temperature and waste engine oil are mixed in a waste engine oil burner (3) and then burned. The high-temperature flue gas generated by the combustion is injected into a high-temperature reforming gasifier (4). At the lower part of the high-temperature reforming gasifier (4), an organic pyrolysis device (2) inputs pyrolysis gas to be purified at 500°C into the high-temperature reforming gasifier (4). Water vapor is also input into the high-temperature reforming gasifier (4). The high-temperature flue gas, the pyrolysis gas to be purified, and the water vapor are mixed in the high-temperature reforming gasifier (4) and a chemical reaction occurs, which purifies the residual organic matter from the combustion of waste engine oil and the pyrolysis gas to be purified. Waste oil combustion: In the waste oil burner (3), waste oil and oxygen with a concentration of more than 99% are burned and react to produce high-temperature flue gas. The high-temperature flue gas is injected into the lower part of the high-temperature reforming gasifier (4), causing the temperature inside the high-temperature reforming gasifier (4) to rise rapidly to 1150℃-1300℃. During the process of burning waste oil and oxygen to raise the temperature, in order to avoid the temperature inside the high-temperature reforming gasifier (4) from exceeding 1300℃, water vapor is introduced into the high-temperature reforming gasifier (4) to cool it down, so that the temperature inside the high-temperature reforming gasifier (4) is maintained at 1150℃-1300℃ and does not exceed 1300℃. Coupled heat supply for cracking, conversion, and gasification reactions: In the high-temperature reforming gasifier (4), waste oil and oxygen are burned in the waste oil burner (3) to generate high-temperature flue gas which is injected into the high-temperature reforming gasifier (4) to raise its temperature. During the heating process, the residual organic matter from the combustion of waste oil, the tar in the pyrolysis gas, and long hydrocarbons are cracked into low-boiling-point short hydrocarbons. Finally, the tar in the pyrolysis gas, long-chain hydrocarbons, carbon in the dust, and water vapor are converted and gasified to produce carbon monoxide and hydrogen. In addition, in the high-temperature reforming gasifier (4), the residual organic matter from the combustion of waste oil is converted and gasified to produce carbon monoxide and hydrogen. The carbon monoxide and hydrogen produced by these two purification processes are mixed with other components of the original pyrolysis gas in the high-temperature reforming gasifier (4) to form high-temperature purified gas, which is discharged from the top of the high-temperature reforming gasifier (4) and enters the waste heat recovery unit (6). High-temperature purified gas cooling: In the waste heat recovery unit (6), the high-temperature purified gas is cooled by the softened water from the softened water storage tank (8) to become medium-temperature purified gas. The softened water in the waste heat recovery unit (6) is heated and turns into water vapor, which is then introduced into the lower part of the high-temperature reforming gasification furnace (4) to cool the contents of the high-temperature reforming gasification furnace (4) and participate in the conversion and gasification reaction. The excess portion of the softened water in the waste heat recovery unit (6) is sent to the water vapor main pipe (7). The medium-temperature purified gas discharged from the waste heat recovery unit (6) is introduced into the intercooler (9). In the intercooler (9), the medium-temperature purified gas is cooled by the ambient temperature circulating water of the circulating cooling water station (10) to become ambient temperature purified gas. The ambient temperature purified gas is then sent to the purified gas compressor (11) for pressurization and then sent to the purified gas user (12) for use.

2. The coupled process method for waste oil treatment and purification of organic pyrolysis gas according to claim 1, characterized in that: Reforming involves at least the following chemical reactions: The combustion reaction equation is: CmHn + (m+n / 4)O2= mCO2+(n / 2)H2O+Q, the reaction releases heat and produces high-temperature flue gas; CmHn in this equation represents waste engine oil; The conversion reaction equation is: CmHn + mH2O = mCO + (n / 2 + m)2H2 - Q, which absorbs heat. In this equation, CmHn represents tar and hydrocarbons in the pyrolysis gas, and CmHn also represents the residual organic matter from the combustion of waste engine oil. The gasification reaction equation is: C + H2O = CO + H2, where "C" represents the carbon in the dust and the carbon produced by the cracking of residual organic matter from the combustion of tar, hydrocarbons, and waste oil.

3. The waste oil treatment and organic pyrolysis gas purification coupling system used in the method according to claim 1 or 2 is characterized in that: The main devices that the pyrolysis gas to be purified passes through in the purification coupling system to become purified room temperature gas delivered to users are: organic pyrolysis unit (2), high temperature reforming gasifier (4), waste heat recovery unit (6), intercooler (9), purified gas compressor (11), and purified gas user (12); the specific connection relationship of all devices in the system is as follows: The outlet pipe of the organic pyrolysis unit (2) and the steam outlet pipe of the waste heat recovery unit (6) are respectively connected to the high-temperature reforming gasifier (4) below, so that the pyrolysis gas and water vapor to be purified are introduced into the lower part of the high-temperature reforming gasifier (4); the oxygen storage tank (1) and the waste oil storage tank (14) are connected to the inlet of the waste oil burner (3), and the flue gas outlet of the waste oil burner (3) is connected to the high-temperature reforming gasifier (4), so that the high-temperature flue gas is introduced into the high-temperature reforming gasifier (4); the lowest end of the high-temperature reforming gasifier (4) is connected to the water seal pool (5), and the water seal pool (5) stores the slag after the reaction in the high-temperature reforming gasifier (4); The top of the high-temperature reforming gasifier (4) is connected to the waste heat recovery unit (6), which in turn is connected to the softened water storage tank (8). The softened water storage tank (8) inputs softened water into the waste heat recovery unit (6). The top of the high-temperature reforming gasifier (4) sends high-temperature purified gas to the waste heat recovery unit (6) where the softened water input from the softened water storage tank (8) is cooled into medium-temperature purified gas. The softened water is heated into steam and then sent from the waste heat recovery unit (6) to the high-temperature reforming gasifier (4) to supply purified pyrolysis gas and residual organic matter from the combustion of waste oil. Excess steam is sent from the waste heat recovery unit (6) to the steam main pipe (7) for external supply. The medium-temperature purified gas output pipe of the waste heat recovery unit (6) is connected to the intercooler (9). The waste heat recovery unit (6) delivers the medium-temperature purified gas to the intercooler (9) to cool it down to normal temperature purified gas. The normal temperature purified gas output pipe of the intercooler (9) is connected to the purified gas compressor (11). The normal temperature purified gas is pressurized by the purified gas compressor (11) into high-pressure normal temperature purified gas and delivered to the purified gas user (12) through the output pipe.

4. The waste oil treatment and organic pyrolysis gas purification coupling system according to claim 3, characterized in that: The intercooler (9) is also connected to the circulating cooling water station (10), and cooling water circulates between the intercooler (9) and the circulating cooling water station (10).

5. The waste oil treatment and organic pyrolysis gas purification coupling system according to claim 4, characterized in that: The condensate pipe below the intercooler (9) is connected to the condensate circulation washing pump (9-2), which sends the condensate into the condensate storage tank (9-3). A condensate delivery regulating valve (9-3-1) is installed on the pipe connecting the condensate circulation washing pump (9-2) and the condensate delivery into the condensate storage tank (9-3). The condensate level gauge (9-3-2) in the intercooler (9) is connected to the condensate delivery regulating valve (9-3-1), and the condensate level signal in the intercooler (9) controls the condensate delivery regulating valve (9-3-1).

6. The waste oil treatment and organic pyrolysis gas purification coupling system according to claim 5, characterized in that: It also includes a controller (13), a temperature measuring device (4-1T), an oxygen flow regulator (1-1), a pyrolysis gas flow meter (2-1), a steam flow regulator (7-1), and a waste oil flow regulator (14-1); the controller (13) is connected to the temperature measuring device (4-1T), which is located in the upper part of the high-temperature reforming gasifier (4), and the controller (13) receives the temperature signal from the temperature measuring device (4-1T) inside the high-temperature reforming gasifier (4); the controller (13) is also connected to the oxygen flow regulator (1-1), the pyrolysis gas flow meter (2-1), the steam flow regulator (7-1), and the waste oil flow regulator (14-1), respectively. The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of oxygen entering the waste oil burner (3) through the oxygen flow regulator (1-1) and adjust the temperature inside the high-temperature reforming gasifier (4); The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of steam entering the high-temperature reforming gasifier (4) through the steam flow regulator (7-1) and adjust the temperature inside the high-temperature reforming gasifier (4); The controller (13) uses the temperature signal from the temperature measuring device (4-1T) and the pyrolysis gas flow signal from the pyrolysis gas flow meter (2-1) to control the flow rate of waste oil entering the waste oil burner (3) through the waste oil flow regulator (14-1), thereby regulating the temperature inside the high-temperature reforming gasifier (4).

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