Pyrolysis oil and gas cutting device and method

Abstract

The present invention discloses a pyrolysis oil and gas cutting device and method, comprising a waste rubber pellet pyrolysis module, a pyrolysis oil and gas high-efficiency cutting module, a pyrolysis oil and gas condensation module, a Roots blower, a non-condensable gas pressure-stabilizing and conveying module, and a control module. By spraying cooling water and circulating non-condensable gas onto the high-temperature pyrolysis oil and gas, the present invention utilizes the vaporization of the cooling water to absorb a large amount of latent heat of phase change, fully condensing the high-temperature pyrolysis oil and gas. Furthermore, the generated water vapor and non-condensable gas reduce the partial pressure of low-flash-point components in the oil and gas, causing them to continuously migrate from the liquid phase to the gas phase. While ensuring that the oil product flash point meets standards, the minimum flash point cutting temperature required for condensation of high-flash-point oil is lowered, thereby increasing the yield of high-flash-point oil.

Description

Technical Field

[0001] The present invention relates to the technical field of harmless treatment and resource utilization of solid waste, and in particular to a pyrolysis oil and gas cutting device and method. Background Art

[0002] Over the past few decades, rubber materials have been widely used in industries such as transportation, healthcare, electricity, and shipping due to their excellent mechanical strength, heat resistance, wear resistance, and good insulation properties. With the rapid development of the rubber application industry, the production of waste rubber has also shown a sharp upward trend. In the early days, when there was a lack of resource recovery and harmless treatment methods for waste rubber, the difficulty of natural degradation led to large accumulations of waste rubber, which not only occupied valuable land resources but also caused serious environmental pollution.

[0003] Compared with conventional fuels, waste rubber products have higher carbon and hydrogen content and higher calorific value, and have great potential for energy utilization. Among the many waste rubber resource utilization technologies, pyrolysis technology uses pyrolysis methods such as direct pyrolysis, catalytic pyrolysis, and plasma pyrolysis to pyrolyze waste rubber into three-phase products such as solid carbon black, pyrolysis oil, and non-condensable gas under anaerobic conditions. It has the advantages of high resource recovery rate, low environmental pollution, and wide adaptability of raw materials. It is more in line with the concept of energy conservation and environmental protection and is considered to be one of the best ways to treat waste rubber today. Among the pyrolysis products, pyrolysis oil has a high calorific value (>40MJ / kg) and can be used as a liquid fuel instead of petroleum after proper treatment. In addition, its light fraction is rich in limonene and BTEX benzene series, and has high resource utilization value as a general chemical raw material.

[0004] Flash point is one of the key indicators limiting the widespread application of pyrolysis oil. my country's Chemical Classification and Labeling Standards (GB30000.7-2013) stipulates that liquids with a flash point below 60°C are flammable liquids in the classification standards and labeling elements for flammable liquids, posing serious safety hazards during transportation and storage. Traditional processes often use low-temperature water cooling to condense pyrolysis oil and gas, indiscriminately condensing the liquid components in the pyrolysis oil and gas. The flash point of the resulting pyrolysis oil does not exceed 20°C, which is lower than the standard flammable liquid index. This significantly increases storage and transportation costs, creating a technical bottleneck that hinders large-scale application. For example, Chinese patent document No. CN204981538U discloses a system for the simultaneous condensation and oil-water separation and recovery of pyrolysis oil, gas, and water.

[0005] To increase the flash point of pyrolysis oil, fractional distillation is commonly used in engineering. This involves reheating and condensing the resulting pyrolysis oil to separate the high-boiling-point components from the low-boiling-point components. Due to the significant positive correlation between boiling point and flash point, the resulting high-boiling-point pyrolysis oil generally also has a higher flash point. However, fractional distillation also has several significant technical drawbacks. Besides high energy consumption, complex process flows, and high equipment investment costs, it is also prone to azeotropy and a wide distillation range, resulting in poor process stability and very limited flash point improvement. Summary of the Invention

[0006] In response to the problems of low high flash point oil yield, high energy consumption, and low flash point compliance rate in the current pyrolysis oil and gas direct condensation cutting process, the present invention provides a pyrolysis oil and gas high-efficiency cutting value-added device and method, which can further improve the yield of high flash point oil while maintaining the flash point compliance, and reduce energy consumption, thereby realizing efficient and high-yield resource utilization of waste rubber.

[0007] A pyrolysis oil and gas high-efficiency cutting and value-added device, comprising:

[0008] The waste rubber pellet pyrolysis module is used to pyrolyze the waste rubber pellets into high-temperature pyrolysis oil and gas and carbon black, and transport them to the pyrolysis oil and gas high-efficiency cutting module and the carbon black post-processing module through the pyrolysis oil and gas outlet and the carbon black outlet respectively;

[0009] The pyrolysis oil and gas high-efficiency cutting module is used to cut and condense high-temperature pyrolysis oil and gas, and the flash point cutting temperature is 140℃~160℃; specifically, the pyrolysis oil and gas high-efficiency cutting module includes a descending spray tower, an ascending spray tower and a horizontal tower kettle; the top of the descending spray tower is provided with a cooling water spray component, and the lower part is provided with a circulating non-condensable gas inlet; the upper parts of the descending spray tower and the ascending spray tower are both provided with multiple high-flash point oil circulation spray components, and the upper part of the ascending spray tower is provided with a high-flash point oil mist separation filler; the high-temperature pyrolysis oil and gas enter from the upper part of the descending spray tower, and by adjusting the cooling water The flow rate of the spray component, the flow rate of the high-flash-point oil circulation spray component, and the flow rate of the circulating non-condensable gas inlet are used to achieve the cutting and condensation of the pyrolysis oil and gas. The obtained high-flash-point oil is condensed in the horizontal tower kettle. The medium-temperature pyrolysis oil and gas enter the pyrolysis oil and gas condensation module from the upper part of the ascending spray tower for further condensation and separation. The high-flash-point oil is drawn out from the lower part of the horizontal tower kettle through a pipeline equipped with a high-flash-point oil circulation pump and then divided into two paths. One path is connected to the high-flash-point oil circulation spray component through a pipeline with an electric regulating valve, and the other path is connected to the high-flash-point oil storage tank through a pipeline with a high-flash-point oil drain valve.

[0010] The pyrolysis oil and gas condensation module is used to condense the liquid phase components in the medium-temperature pyrolysis oil and gas leaving the pyrolysis oil and gas high-efficiency cutting module, and perform gas-liquid separation on the condensed droplets. The condensation products are low-flash point oil and water;

[0011] Roots blower, used to draw the non-condensable gas output from the pyrolysis oil and gas condensation module to the non-condensable gas pressure-stabilizing transmission module;

[0012] The non-condensable gas pressure-stabilizing and conveying module is used to buffer the non-condensable gas input from the pyrolysis oil and gas condensation module, and convey the non-condensable gas to the waste rubber pellet pyrolysis module and the pyrolysis oil and gas high-efficiency cutting module through pipelines and valves;

[0013] The control module is used to receive the temperature and flow signals measured by instruments at various points, realize real-time monitoring of various operating parameters, and rely on control logic to achieve the purpose of precise control of pyrolysis oil and gas efficient cutting and value-added.

[0014] In order to improve the yield of pyrolysis oil, preferably, the waste rubber pellet pyrolysis module includes a hot blast furnace, a conical hopper, a pyrolysis furnace, a carbon black post-processing module and a flue gas treatment system; the pyrolysis furnace includes a central flue gas pipe, a pyrolysis spiral and a jacketed flue gas pipe which are sequentially arranged from the inside to the outside; wherein, one end of the pyrolysis spiral is provided with a waste rubber pellet inlet and is connected to the conical hopper, and the other end is provided with a pyrolysis oil and gas outlet and a carbon black outlet; the pyrolysis oil and gas outlet is connected to the high-temperature pyrolysis oil and gas inlet at the top of the descending spray tower through a pipeline, and the carbon black outlet is connected to the carbon black post-processing module through a pipeline; the inlet of the central flue gas pipe and the jacketed flue gas pipe is connected to the outlet of the hot blast furnace, and the outlet is connected to the inlet of the flue gas treatment system.

[0015] The hot blast furnace adopts an oil and gas dual-purpose burner, and the pyrolysis module adopts diesel as the hot blast furnace fuel during cold start, and adopts surplus non-condensable gas as the fuel during normal operation, which is self-sufficient.

[0016] Waste rubber particles enter the pyrolysis spiral from the conical hopper, and the inner and outer sides of the pyrolysis spiral are heated simultaneously by the central flue gas duct and the jacketed flue gas duct, which greatly increases the heat exchange area. While meeting the heat required for the pyrolysis process, the pyrolysis temperature is significantly reduced, avoiding the secondary cracking of the pyrolysis oil and gas at high temperature to generate small molecular gaseous products, thereby increasing the yield of the oil phase product after condensation.

[0017] The carbon black post-processing module performs a series of post-processing operations such as upgrading, cooling, and grinding on the carbon black before packaging and selling it; the flue gas treatment system purifies and discharges part of the flue gas after heat exchange, and sends the remaining part back to the hot air furnace outlet for flue gas recycling.

[0018] In order to increase the yield of high flash point oil, reduce condensation energy consumption, and achieve efficient cutting and value-added of pyrolysis oil and gas, preferably, in the pyrolysis oil and gas efficient cutting module, the cooling water spray component sprays cooling water into the downward spray tower. On the one hand, the cooling water vaporizes and absorbs a large amount of phase change latent heat to fully condense the pyrolysis oil and gas; on the other hand, the generated water vapor reduces the partial pressure of the low flash point components in the oil and gas, causing them to continuously migrate from the liquid phase to the gas phase, thereby reducing the proportion of low flash point components dissolved in the high flash point oil, which effectively improves the safety margin of the oil flash point (≥60°C). On the premise of ensuring that the oil flash point meets the standard, it is allowed to further reduce the minimum flash point cutting temperature required for the condensation of high flash point oil, thereby improving the yield of high flash point oil.

[0019] The circulating non-condensable gas inlet introduces condensed non-condensable gas into the downward spray tower. Similar to the working principle of water vapor, the introduced circulating non-condensable gas greatly reduces the partial pressure of low flash point components in the oil and gas, which can effectively increase the yield of high flash point oil.

[0020] The introduced water vapor and circulating non-condensable gas do not directly react chemically with the pyrolysis oil and gas. However, the ideal gas partial pressure is proportional to its mole fraction in the gas mixture. Therefore, the introduction of water vapor and circulating non-condensable gas can effectively reduce the partial pressure of low-flash-point components in the oil and gas, causing these components to continuously migrate from the liquid phase to the gas phase, achieving full extraction of low-flash-point components. Because the flash point of an oil product is closely related to the flash points of its individual components, the reduction of low-flash-point components in high-flash-point oil can significantly increase the overall flash point of the oil product. While ensuring that the oil product flash point meets the standard, the minimum flash point cut-off temperature required for condensation of the high-flash-point oil can be further reduced, thereby increasing the yield of high-flash-point oil.

[0021] The theoretical basis for improving the flash point of oil products is as follows:

[0022] Assuming that the pressure in the quench tower tank (total oil and gas pressure) is P and remains constant, and the condensation cut-off temperature (system temperature) is T, then:

[0023] (1) Before spraying cooling water and introducing circulating non-condensable gas:

[0024] Vapor pressure P of each component of pyrolysis oil i 0 Calculated by the Antoine equation:

[0025]

[0026] Where: ——vapor pressure of component i, Pa;

[0027] A i 、B i 、C i ——Antoine constant;

[0028] T——system temperature, K.

[0029] Antoine constant A i , B i , C i It can be found in the relevant thermodynamics handbook.

[0030] The partial pressure P of each component in the gas phase i Calculated from Dalton's law of partial pressure:

[0031]

[0032] Where: P——total oil and gas pressure, MPa;

[0033] P i ——partial pressure of component i, MPa;

[0034] x i ——molar fraction of component i in the gas phase, %;

[0035] N——Number of oil and gas components, pieces.

[0036] Raoult's law states that in a dilute solution at constant temperature and pressure, the vapor pressure of the solvent in the gas phase is equal to the vapor pressure of the pure solvent multiplied by the mole fraction of the solvent in the solution. Its mathematical expression is:

[0037]

[0038] Where: P A ——Vapor pressure of solvent A in the gas phase, Pa;

[0039] ——Vapor pressure of pure solvent A at constant temperature, Pa;

[0040] x A ——The mole fraction of A in the solution, %.

[0041] Extensive scientific research and practical experience have proven that Raoult's law applies not only to dilute solutions but also to ideal liquid mixtures. Pyrolysis oil contains a variety of components with similar chemical structures and similar relative molecular masses, so it can be regarded as an ideal liquid mixture. Therefore, the mole fraction of each component in the liquid phase can be calculated according to Raoult's law:

[0042]

[0043] Where: y i ——the mole fraction of component i in the liquid phase, %;

[0044] P i ——vapor pressure of component i in the gas phase, MPa;

[0045] ——Vapor pressure of pure component i under constant temperature conditions, MPa.

[0046] After the components and mole fractions of the pyrolysis oil are determined, the flash point of the condensed pyrolysis oil can be calculated using the empirical formula for estimating the flash point of the mixed solution:

[0047]

[0048] Where: T F ——Flash point of pyrolysis oil, °C;

[0049] N——Number of pyrolysis oil components, pieces;

[0050] y i ——the mole fraction of component i in the liquid phase, %;

[0051] T i ——Flash point of component, °C.

[0052] (2) After spraying cooling water and introducing circulating non-condensable gas:

[0053] The cooling water absorbs heat and vaporizes into water vapor, which enters the gas phase together with the circulating non-condensable gas. The partial pressure of each component is diluted to P i ′:

[0054]

[0055] Where: P i '——partial pressure of component i, MPa;

[0056] x w ——molar fraction of water vapor in the gas phase, %;

[0057] x rng ——The mole fraction of circulating non-condensable gas in the gas phase, %.

[0058] The mole fraction of each component in the liquid phase becomes:

[0059]

[0060] Where: y i '——the mole fraction of component i in the liquid phase, %;

[0061] P i '——vapor pressure of component i in gas phase, MPa;

[0062] ——Vapor pressure of pure component i under constant temperature conditions, MPa.

[0063] At this time, the flash point TF ′ becomes:

[0064]

[0065] (3) Flash point enhancement effect:

[0066] △T F =T′ F -T F

[0067] Where: △T F ——Flash point enhancement effect, ℃.

[0068] The high flash point oil circulation spray component, under the control of the high flash point oil circulation oil pump and the high flash point oil circulation flow regulating valve, sprays high flash point circulation oil to flush the inner wall of the spray tower, effectively preventing slagging and reducing the probability of blockage problems; the circulating non-condensable gas inlet introduces a large amount of non-condensable gas condensed by the pyrolysis oil and gas condensation module into the pyrolysis oil and gas, greatly reducing the partial pressure of the low flash point components in the pyrolysis oil and gas, making it more difficult to condense. At the same condensation temperature, the flash point of the high flash point oil can be effectively improved. Since the flash point cutting temperature is proportional to the flash point of the pyrolysis oil, the minimum flash point cutting temperature required for the condensation of the high flash point oil can be further reduced under the premise of controlling the cutting flash point to meet the standard, thereby improving the yield of the high flash point oil and reducing the energy consumption of the water-cooled heat exchanger during the subsequent condensation of the low flash point oil and gas components.

[0069] The horizontal tower kettle is provided with a tower kettle oil temperature measuring point and a quenching tower kettle liquid level gauge. High flash point oil is drawn out from the lower part of the horizontal tower kettle through a pipeline provided with a high flash point oil circulation oil pump. The pipeline is divided into two routes. One route is connected to the high flash point oil circulation spray components arranged on the upper part of the descending spray tower and the ascending spray tower through a pipeline with a high flash point oil circulation flow regulating valve, and the other route is connected to the high flash point oil storage tank through a pipeline with a high flash point oil drain valve; a sewage outlet is provided at the bottom of the horizontal tower kettle, which is connected to the sewage treatment module through a pipeline with a sewage valve. The horizontal tower kettle has sufficient volume and serves as a buffer for high-flash-point oil; the tower kettle oil temperature measuring point constantly monitors the temperature inside the tower kettle, and cooperates with the control system to adjust the cooling water spray flow rate to roughly adjust the flash point cutting temperature of the pyrolysis oil and gas; in order to realize the automatic discharge of high-flash-point oil, the tower kettle liquid level gauge of the quenching tower monitors the liquid level of the high-flash-point oil inside the tower kettle, and controls the discharge volume by adjusting the opening of the high-flash-point oil drain valve through the control system; the horizontal tower kettle sewage outlet sends pollutants to the sewage treatment module for harmless treatment by adjusting the opening of the sewage valve.

[0070] The upper portion of the ascending spray tower is equipped with a high-flash-point oil mist separation packing, a high-flash-point oil circulation spray component, and a medium-temperature pyrolysis oil and gas outlet. After exiting the descending spray tower, the pyrolysis oil and gas enter the ascending spray tower through the horizontal tower kettle. The high-flash-point oil mist separation packing is used to filter the condensed high-flash-point oil mist, which helps improve the yield of high-flash-point oil. The high-flash-point oil circulation spray component sprays circulating oil onto the inner wall of the tower, effectively preventing slagging and clogging. The medium-temperature pyrolysis oil and gas outlet conveys the medium-temperature pyrolysis oil and gas to the medium-temperature pyrolysis oil and gas inlet at the top of the condensing tower of the pyrolysis oil and gas condensation module via a pipeline equipped with a medium-temperature pyrolysis oil and gas temperature measuring point. The medium-temperature pyrolysis oil and gas temperature measuring point constantly monitors the temperature of the pyrolysis oil and gas discharged from the ascending spray tower and, in conjunction with the control system, adjusts the high-flash-point oil circulation spray volume and the circulating non-condensable gas flow rate to fine-tune the flash point cutoff temperature of the pyrolysis oil and gas.

[0071] To fully dilute the partial pressure of low-flash-point components in the pyrolysis oil and gas, the circulating non-condensable gas inlet preferably includes a gas pipeline and a nozzle. The nozzle is a flat nozzle with adjustable rotation angle, generating a multi-angle fan-shaped airflow that facilitates thorough mixing of the pyrolysis oil and gas with the circulating non-condensable gas. The gas pipeline is arranged in a four-corner tangential circle configuration, creating a strong rotation of the circulating non-condensable gas within the downward spray tower, enhancing mixing between the pyrolysis oil and gas and the circulating non-condensable gas, which facilitates sufficient dilution of the partial pressure of low-flash-point components in the oil and gas.

[0072] In order to improve the utilization rate of the oil phase components of the pyrolysis products, preferably, the pyrolysis oil and gas condensation module includes a condensation tower, and the condensation tower is provided with a low flash point oil circulation spray component, a condensation tower kettle liquid level gauge and a condensation tower non-condensable gas outlet.

[0073] Among them, the top of the condensing tower is provided with a medium-temperature pyrolysis oil and gas inlet, which sends the medium-temperature pyrolysis oil and gas from the pyrolysis oil and gas high-efficiency cutting module into the inside of the condensing tower; the lower part of the condensing tower is connected to the low-flash point oil through a pipeline equipped with a low-flash point oil circulation pump, and then divided into two paths, one of which is connected to the low-flash point oil circulation spray component arranged on the upper part of the condensing tower through a circulating spray oil pipeline with a water-cooled heat exchanger and a low-flash point oil circulation flow regulating valve, and the other is connected to the low-flash point oil storage tank through a pipeline with a valve; the bottom of the condensing tower is connected to the cooling water spray component on the top of the descending spray tower of the pyrolysis oil and gas high-efficiency cutting module through a cooling water spray pipeline equipped with a bypass regulating valve and a cooling spray water pump; the non-condensable gas outlet of the condensing tower is connected to the non-condensable gas pressure stabilizing and conveying module through a pipeline with an oil mist filter, a non-condensable gas temperature measuring point and a Roots blower.

[0074] The low-flash-point oil circulation spraying component condenses the medium-temperature pyrolysis oil gas entering the tower body by spraying the low-flash-point circulation oil cooled by the water-cooled heat exchanger, and the condensation products include low-flash-point oil and water; the low-flash-point oil circulation pump draws out the low-flash-point oil from the lower part of the tower body, and uses it for circulation spraying and low-flash-point oil discharge through the diversion of two pipelines, wherein the low-flash-point oil circulation spraying pipeline first sends the low-flash-point oil to the water-cooled heat exchanger for cooling, and then controls the flow rate of the low-flash-point circulation oil by adjusting the opening of the low-flash-point oil circulation flow regulating valve; the low-flash-point oil discharge pipeline controls the discharge volume by adjusting the opening of the low-flash-point oil discharge valve and transports it to the low-flash-point oil storage tank; the cooling water pump sends the cooling water to the low-flash-point oil storage tank through the pipeline Water is transported to the cooling water spray component at the top of the downward spray tower of the pyrolysis oil and gas high-efficiency cutting module, and the control system controls the cooling water spray flow by adjusting the opening of the bypass regulating valve; the oil mist filter is placed behind the non-condensable gas outlet of the condensing tower to filter and discharge the oil mist and water mist carried in the non-condensable gas, thereby improving the purity of the obtained non-condensable gas. The non-condensable gas temperature measuring point set at the outlet of the oil mist filter evaluates the condensation effect of the low-flash point oil by monitoring the non-condensable gas temperature, and cooperates with the control system to adjust the cooling water volume of the water-cooled heat exchanger to control the cooling effect of the low-flash point circulating oil; the condensing tower kettle liquid level gauge monitors the liquid level of the low-flash point oil inside the tower kettle and the interface position of the oil-water stratification interface to ensure the realization of automatic oil drainage and automatic drainage functions.

[0075] In order to improve the continuity of operation of the pyrolysis oil and gas efficient cutting and value-added device, preferably, the high flash point oil circulation spray component and the low flash point oil circulation spray component adopt the same structural design, including flange, oil spray pipe, nozzle mounting seat, nozzle, diameter ball valve, and sleeve.

[0076] Among them, the flange, fuel injection pipe, nozzle mounting seat and nozzle are connected in sequence; the fuel injection pipe is equipped with a bore ball valve. When the spray component encounters a problem, there is no need to shut down. Just close the bore ball valve to disconnect it from the pipeline, and then you can take out the nozzle and repair it.

[0077] In order to achieve efficient energy utilization of the gaseous components of the pyrolysis products, preferably, the non-condensable gas pressure-stabilizing and transporting module includes a non-condensable gas pressure-stabilizing tank and a non-condensable gas pressure-stabilizing regulating valve, the non-condensable gas outlet of the condensing tower of the pyrolysis oil and gas condensing module is connected to the top inlet of the non-condensable gas pressure-stabilizing tank through a pipeline, and the lower part of the non-condensable gas pressure-stabilizing tank is provided with a circulating non-condensable gas outlet and a surplus non-condensable gas outlet;

[0078] The circulating non-condensable gas outlet is connected to the circulating non-condensable gas inlet in the middle of the downward spray tower of the pyrolysis oil and gas high-efficiency cutting module through a circulating non-condensable gas pipeline with a regulating valve and a flow meter, and the surplus non-condensable gas outlet is connected to the hot air furnace of the waste rubber crumb pyrolysis module through a surplus non-condensable gas pipeline with a regulating valve and a flow meter.

[0079] After leaving the condensing tower outlet, the low-temperature non-condensable gas is continuously fed into the non-condensable gas pressure-surge tank for buffering under the action of a Roots blower. The circulating non-condensable gas outlet delivers the circulating non-condensable gas to the circulating non-condensable gas inlet of the pyrolysis oil and gas high-efficiency cutting module via a pipeline. The pipeline is equipped with a circulating non-condensable gas flow control valve and a circulating non-condensable gas flow meter. The control system adjusts the opening of the flow control valve based on the medium-temperature oil and gas temperature measurement point and the reading of the circulating non-condensable gas flow meter. By controlling the flow rate of the circulating non-condensable gas, fine-tuning of the pyrolysis oil and gas flash point cutting temperature is achieved. The surplus non-condensable gas outlet delivers the surplus non-condensable gas to the hot air furnace via a pipeline for combustion.

[0080] The control module includes a control system and a thermocouple, a flow meter, an electric regulating valve and a water-cooled heat exchanger connected to the control system;

[0081] Among them, the thermocouple is arranged at the horizontal tower kettle temperature measuring point of the pyrolysis oil and gas high-efficiency cutting module, the medium-temperature pyrolysis oil and gas outlet temperature measuring point of the upward spray tower, and the non-condensable gas outlet temperature measuring point of the condensing tower of the pyrolysis oil and gas condensing module; the flow meter is arranged on the cooling water spray pipeline of the pyrolysis oil and gas condensing module, the circulating non-condensable gas pipeline and the surplus non-condensable gas pipeline of the non-condensable gas pressure stabilizing and conveying module; the electric regulating valve is arranged on the high flash point oil circulation spray pipeline of the pyrolysis oil and gas high-efficiency cutting module, the low flash point oil circulation spray pipeline and the cooling water spray pipeline bypass of the pyrolysis oil and gas condensing module, the circulating non-condensable gas pipeline and the surplus non-condensable gas pipeline of the non-condensable gas pressure stabilizing and conveying module; the water-cooled heat exchanger is arranged on the low flash point oil circulation spray oil pipeline of the pyrolysis oil and gas condensing module.

[0082] A method for efficiently cutting and adding value to pyrolysis oil and gas, using the above-mentioned device for efficiently cutting and adding value to pyrolysis oil and gas, specifically comprises the following steps:

[0083] Step 1: Turn on the hot air furnace of the waste rubber pellet pyrolysis module, introduce high-temperature flue gas into the flue gas duct, and heat the pyrolysis furnace;

[0084] Step 2: Start the pyrolysis screw, and the waste rubber particles enter the pyrolysis furnace through the conical hopper, where they are rapidly pyrolyzed to generate high-temperature pyrolysis oil and gas and carbon black;

[0085] Step 3: The carbon black enters the carbon black post-processing module for further processing;

[0086] Step 4: The high-temperature pyrolysis oil and gas enter the pyrolysis oil and gas efficient cutting module, and the high-flash point oil condenses at the bottom of the horizontal tower kettle, achieving efficient cutting and condensation of the pyrolysis oil and gas;

[0087] Step 5: The low-temperature pyrolysis oil and gas enter the pyrolysis oil and gas condensation module for further condensation, and the low-flash point oil and water condense at the bottom of the condensation tower and separate into layers;

[0088] Step 6: The condensed water is sent back to the pyrolysis oil and gas efficient cutting module to participate in the condensation of the high-temperature pyrolysis oil and gas;

[0089] Step 7: The remaining non-condensable gas after condensation enters the non-condensable gas pressure stabilization and delivery module and is buffered in the non-condensable gas pressure stabilization tank;

[0090] Step 8: The buffered non-condensable gas is sent to the pyrolysis oil and gas efficient cutting module to participate in the condensation of high-temperature pyrolysis oil and gas; the surplus non-condensable gas is sent to the hot air furnace for combustion utilization;

[0091] Step 9: After the flue gas is heat-utilized, it enters the flue gas treatment system, and part of the flue gas is recycled.

[0092] Excess smoke is discharged to the outside, effectively reducing heat loss from exhaust.

[0093] In order to achieve precise control of the efficient cutting and value-added process of pyrolysis oil and gas, the specific control objectives and logic for achieving efficient cutting and condensation of pyrolysis oil and gas in step 4 are as follows:

[0094] To achieve efficient cutting and value-added of pyrolysis oil and gas, the internal temperature of the horizontal tower kettle of the pyrolysis oil and gas efficient cutting module needs to be controlled within the range of 140℃ to 160℃, and this should be used as the primary control target. To ensure sufficient condensation of pyrolysis oil and gas, the internal temperature of the condensation tower of the pyrolysis oil and gas condensation module needs to be controlled within the range of 20℃ to 30℃, and this should be used as the secondary control target.

[0095] To achieve the primary control target, the following control logic is formed: the preliminary temperature control target is set at 130°C to 170°C. If the preliminary temperature control target is not met, the temperature measured at the horizontal tower bottom oil temperature measuring point is used as a basis to adjust the opening of the electric regulating valve of the cooling water spray pipeline bypass in the pyrolysis oil and gas condensation module to control the cooling water spray flow rate, thereby meeting the preliminary temperature control target; after the preliminary temperature control target is met, if the primary control target is still not met, the temperature measured at the medium-temperature pyrolysis oil and gas outlet temperature measuring point of the upward spray tower in the pyrolysis oil and gas high-efficiency cutting module is used as a basis to control the circulating non-condensable gas flow rate by adjusting the opening of the electric regulating valve of the circulating non-condensable gas pipeline in the non-condensable gas pressure-stabilizing transmission module, thereby meeting the primary control target;

[0096] In order to achieve the secondary control target, the following control logic is formed: if the secondary control target requirement is not met, the temperature measured at the non-condensable gas outlet temperature measuring point of the condensing tower in the pyrolysis oil and gas condensation module is used as the basis, and the cooling water volume of the water-cooled heat exchanger and the opening of the low-flash point oil circulation flow regulating valve are adjusted to control the size of the spray flow while keeping the low-flash point circulating oil temperature unchanged, thereby realizing automatic control of the medium-temperature pyrolysis oil and gas condensation temperature to meet the secondary control target requirement.

[0097] Compared with the prior art, the present invention has the following beneficial effects:

[0098] The present invention adopts the method of spraying cooling water and introducing circulating non-condensable gas to the high-temperature pyrolysis oil and gas. On the one hand, the cooling water vaporization is used to absorb a large amount of phase change latent heat, thereby fully condensing the high-temperature pyrolysis oil and gas. On the other hand, the generated water vapor and non-condensable gas reduce the partial pressure of the low flash point components in the oil and gas, causing them to continuously migrate from the liquid phase to the gas phase, thereby reducing the proportion of low flash point components dissolved in the high flash point oil, which effectively improves the safety margin of the oil flash point (≥60°C). On the premise of ensuring that the oil flash point meets the standard, the minimum flash point cutting temperature required for the condensation of high flash point oil can be further reduced, thereby increasing the yield of high flash point oil; the condensation of the medium-temperature pyrolysis oil and gas by the pyrolysis oil and gas condensation module improves the utilization rate of the oil phase components of the pyrolysis product, and at the same time provides the cooling water required for the condensation cutting process; the caching and transportation of the non-condensable gas by the non-condensable gas pressure stabilizing and conveying module realizes the energy recycling of the gas phase components of the pyrolysis product. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] Figure 1 This is an overall schematic diagram of a pyrolysis oil and gas high-efficiency cutting and value-added device according to an embodiment of the present invention;

[0100] Figure 2 A schematic top view of the arrangement of the circulating non-condensable gas inlet in an embodiment of the present invention;

[0101] Figure 3 Schematic diagram of the structure of the high flash point oil circulation spray component and the low flash point oil circulation spray component in an embodiment of the present invention. DETAILED DESCRIPTION

[0102] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention is further described below with reference to the embodiments and accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the described embodiments without requiring creative effort are intended to fall within the scope of protection of the present invention.

[0103] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "include" or "comprise" and the like used in the present invention mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0104] like Figure 1 As shown, it includes a waste rubber pellet pyrolysis module 1, a pyrolysis oil and gas efficient cutting module 2, a pyrolysis oil and gas condensation module 3, a Roots blower 4, a non-condensable gas pressure stabilizing and conveying module 5 and a control module 6.

[0105] The waste rubber pellet pyrolysis module 1 includes a hot air furnace 101, a conical hopper 102, a pyrolysis furnace 103, a pyrolysis oil and gas outlet 104, a carbon black post-processing module 105, and a flue gas treatment system 106. The pyrolysis furnace 103 includes a central flue gas pipe, a pyrolysis spiral, and a jacketed flue gas pipe, which are arranged in sequence from the inside out. These pipes are used to pyrolyze the waste rubber pellets into pyrolysis oil and gas and carbon black, which are then transported to the pyrolysis oil and gas efficient cutting module 2 and the carbon black post-processing module 105 through the pyrolysis oil and gas outlet 104 and the carbon black outlet, respectively.

[0106] The pyrolysis oil and gas efficient cutting module 2 includes a horizontal tower kettle 201, a descending spray tower 202 and an ascending spray tower 203, and also includes a high-temperature pyrolysis oil and gas inlet 204, a medium-temperature pyrolysis oil and gas outlet 205, and the top of the descending spray tower 202 is provided with a cooling water spray component 206, a high flash point oil circulation oil pump 207, a high flash point oil circulation flow regulating valve 208, a high flash point oil circulation spray component 209, a high flash point oil mist separation filler 210, a circulating non-condensable gas inlet 211, a quenching tower kettle liquid level gauge 212, a high flash point oil drain valve 213, a high flash point oil storage tank 214, a drain valve 215, a drain treatment module 216, a tower kettle oil temperature measuring point 217 and a medium-temperature oil and gas temperature measuring point 218.

[0107] like Figure 2 As shown, the circulating non-condensable gas inlet 211 includes a nozzle 2111 and a gas pipeline 2112, which is used to introduce the circulating non-condensable gas into the upward spray tower. Figure 3 As shown, the high-flash-point oil circulation spray module 209 includes a flange 2091, an oil spray pipe 2092, a nozzle mounting base 2093, a nozzle 2094, a full-diameter ball valve 2095, and a sleeve 2096. It is used to spray condensed high-flash-point oil into the upward and downward spray towers. This module is used to cut and condense pyrolysis oil and gas by adjusting the cooling water spray flow rate, the circulating spray oil flow rate, and the circulating non-condensable gas flow rate.

[0108] The pyrolysis oil and gas condensation module 3 includes a condensation tower 301, a medium-temperature pyrolysis oil and gas inlet 302, a condensation tower non-condensable gas outlet 303, an oil mist filter 304, a cooling water pump 305, a bypass regulating valve 306, a cooling water flow meter 307, a low-flash-point oil circulation pump 308, a water-cooled heat exchanger 309, a low-flash-point oil circulation flow regulating valve 310, a low-flash-point oil circulation spray unit 311, a condensation tower kettle level gauge 312, a low-flash-point oil drain valve 313, a low-flash-point oil storage tank 314, and a non-condensable gas temperature measurement point 315. The low-flash-point oil circulation spray unit 311 uses the same structural design as the high-flash-point oil circulation spray unit 209 and is used to spray condensed low-flash-point oil into the condensation tower. This module is used to condense the liquid phase of the medium-temperature pyrolysis oil and gas leaving the pyrolysis oil and gas efficient cutting module and perform gas-liquid separation on the condensed droplets. The condensed products are low-flash-point oil and water.

[0109] The Roots blower 4 is used to draw the non-condensable gas output from the pyrolysis oil and gas condensation module to the non-condensable gas pressure stabilization and delivery module.

[0110] The non-condensable gas pressure stabilizing and conveying module 5 includes a non-condensable gas pressure stabilizing tank 501, a circulating non-condensable gas pressure stabilizing regulating valve 502, a circulating non-condensable gas flowmeter 503, a surplus non-condensable gas pressure stabilizing regulating valve 504 and a surplus non-condensable gas flowmeter 505, which are used to buffer the non-condensable gas input by the pyrolysis oil and gas condensation module, and transport the non-condensable gas to the waste rubber pellet pyrolysis module and the pyrolysis oil and gas high-efficiency cutting module through pipelines and valves.

[0111] The control module 6 mainly includes a main control system, which is used to receive temperature, flow and other signals measured by instruments at various points, realize real-time monitoring of key operating parameters, and rely on control logic to achieve the purpose of efficient cutting and value-added precise control of pyrolysis oil and gas.

[0112] In order to improve the yield of pyrolysis oil, in the waste rubber pellet pyrolysis module 1, the pyrolysis furnace 103 adopts a structural design in which a central flue gas duct and a jacketed flue gas duct are used to heat the inner and outer sides of the pyrolysis spiral at the same time, thereby greatly increasing the heat exchange area. While meeting the heat required for the pyrolysis process, the pyrolysis temperature is significantly reduced, avoiding the secondary cracking of the pyrolysis oil and gas at high temperature to generate small molecular gaseous products, thereby increasing the yield of the oil phase product after condensation.

[0113] To increase the yield of high-flash-point oil, a cooling water spray component is installed at the top of the downward spray tower 202 in the pyrolysis oil and gas efficient cutting module 2. By spraying cooling water into the downward spray tower, the high-temperature pyrolysis oil and gas generated from the waste rubber pellet pyrolysis module 1 are rapidly cooled. Because the temperature of the pyrolysis oil and gas is much higher than the boiling point of water at the corresponding pressure, the cooling water and the high-temperature pyrolysis oil and gas undergo a phase change process of direct contact heat exchange, ensuring the efficiency and rapidity of the pyrolysis oil and gas rapid cooling process, which can significantly reduce the condensation temperature of the pyrolysis oil and gas, thereby more fully condensing the high-flash-point oil. In addition, a high-flash-point oil mist separation filler 210 is arranged in the upward spray tower 203 to filter the high-flash-point oil that remains in a mist form after condensation, thereby improving the collection rate of the high-flash-point oil.

[0114] In order to prevent the flash point of the high-flash-point oil obtained by condensation from being reduced due to the reduction in the flash point cutting temperature, a cooling water spray component 206 and a circulating non-condensable gas inlet 211 are arranged in the downward spray tower 202 in the pyrolysis oil and gas efficient cutting module 2 to spray cooling water and introduce circulating non-condensable gas into the tower body. The spraying of cooling water provides preliminary cooling of the high-temperature pyrolysis oil and gas, while also diluting the partial pressure of the low-flash-point components in the oil and gas; the circulating non-condensable gas introduced has a greater dilution effect on the partial pressure of the low-flash-point components due to its larger volume flow rate. The flash point of an oil product is closely related to the flash point of each of the individual components it contains. The reduction in the partial pressure of the low-flash-point component reduces the proportion of the low-flash-point component that dissolves in the high-flash-point oil, ensuring that the flash point of the high-flash-point oil meets the standard. Table 1 shows a comparison of the effects of spraying cooling water or not on the flash point of high-flash-point oil at different flash point cutting temperatures.

[0115] Table 1

[0116]

[0117] In order to avoid blockage of the oil and gas channels inside the spray tower, in the pyrolysis oil and gas efficient cutting module 2, high flash point oil circulation spray components 209 are arranged in the downward spray tower 202 and the upward spray tower 203. The condensed high flash point oil is sprayed and flushed on the inner wall of the spray tower through the circulation spray component under the control of the high flash point oil circulation oil pump 207 and the high flash point oil circulation flow regulating valve 208, effectively preventing slagging and reducing the probability of blockage problems.

[0118] To automatically drain both high-flash-point and low-flash-point oils, a quench tower kettle level gauge 212 monitors the high-flash-point oil level in the horizontal kettle, while a condenser kettle level gauge 312 monitors the low-flash-point oil level in the condenser. A control system adjusts the openings of high-flash-point oil drain valves 213 and low-flash-point oil drain valves 313 to control the discharge volume of both types of oil. To ensure the purity and quality of the high-flash-point oil, drain valve 215 is regularly opened to drain waste, promptly discharging waste generated within the tank and sending it to wastewater treatment module 216 for harmless treatment.

[0119] In order to ensure that the flash point of the high flash point oil is ≥60° C., it is necessary to accurately control the oil and gas flash point cutting temperature inside the horizontal tower kettle 201 in the pyrolysis oil and gas efficient cutting module 2. First, the bottom oil temperature measuring point 217 monitors the temperature inside the bottom of the tower at all times, and the control system 6 gives feedback based on the received temperature signal, automatically adjusting the load of the cooling water pump 305 and the opening size of the bypass regulating valve 306, so as to achieve the effect of controlling the cooling water spray flow rate and realizing coarse adjustment of the flash point cutting temperature of the pyrolysis oil and gas (controlled within 130℃~170℃); secondly, the medium-temperature pyrolysis oil and gas temperature measuring point 218 monitors the temperature of the medium-temperature pyrolysis oil and gas discharged from the upward spray tower 203 at all times, and the control system 6 gives feedback based on the received temperature signal, automatically adjusting the load of the high-flash-point oil circulation pump 207, the opening size of the high-flash-point oil circulation flow regulating valve 208 and the opening size of the circulating non-condensable gas pressure stabilizing regulating valve 502, and realizing fine adjustment of the flash point cutting temperature of the pyrolysis oil and gas (controlled within 140℃~160℃) by adjusting the high-flash-point oil circulation spray amount and the circulating non-condensable gas flow rate.

[0120] In order to fully dilute the partial pressure of low-flash-point components in the pyrolysis oil and gas, the circulating non-condensable gas inlet 211 is composed of a nozzle 2111 and a gas pipeline 2112. The nozzle 2111 adopts a flat nozzle, and the nozzle rotation angle is adjustable. It can extend the airflow mixing section by generating multi-angle fan-shaped airflows, so that the pyrolysis oil and gas and the circulating non-condensable gas are fully mixed; the gas pipeline adopts a four-corner tangential circle arrangement, and the circulating non-condensable gas airflow forms a strong rotation inside the spray tower body, which disturbs and mixes well, further strengthening the mixing of the pyrolysis oil and gas and the circulating non-condensable gas, which is conducive to fully diluting the partial pressure of low-flash-point components in the oil and gas. The specific structure of the circulating non-condensable gas inlet is as follows: Figure 2 shown.

[0121] To improve the yield of low-flash-point oil, in the pyrolysis oil and gas condensation module 3, the condensed low-flash-point oil is first drawn out of the condensation tower 301 under the action of the low-flash-point oil circulation pump 308, and then sent to the water-cooled heat exchanger 309 for cooling through the low-flash-point oil circulation spray pipeline. The flow rate of the low-flash-point circulation oil is then controlled by adjusting the opening of the low-flash-point oil circulation flow regulating valve 310. Finally, the low-flash-point oil circulation spray component 311 provided at the top of the condensation tower is sprayed into the interior of the tower body. The sprayed low-flash-point oil directly contacts the medium-temperature pyrolysis oil and gas entering the condensation tower for heat exchange, which can quickly complete the heat exchange, ensuring the full and efficient low-flash-point oil condensation process and avoiding the problem of reduced yield due to insufficient condensation. In addition, the spraying of low-flash-point oil can also effectively prevent slagging on the walls of the condensation tower, reducing the probability of clogging. The oil mist filter 304 is arranged behind the non-condensable gas outlet 303 of the condensation tower, and can filter the oil mist and water mist carried in the non-condensable gas, which not only improves the collection rate of low flash point oil, but also ensures the purity of the obtained non-condensable gas.

[0122] To ensure the quality of the low-flash-point oil, the condensation temperature of the medium-temperature pyrolysis oil and gas entering the pyrolysis oil and gas condensation module 3 must be precisely controlled. Non-condensable gas temperature measurement point 315 monitors the non-condensable gas temperature to assess the condensation efficiency of the low-flash-point oil. Control system 6 provides feedback based on the received temperature signal, automatically adjusting the cooling water flow rate of the water-cooled heat exchanger 309 and the opening of the low-flash-point oil circulation flow control valve 310. This controls the spray flow rate while maintaining a constant low-flash-point circulating oil temperature, achieving automatic control of the medium-temperature pyrolysis oil and gas condensation temperature (within a range of 20°C to 30°C).

[0123] In order to ensure the coordinated operation of the automatic oil discharge and automatic water drainage functions of the condensing tower, the condensing tower kettle liquid level meter 312 always monitors the liquid level of the low-flash-point oil inside the kettle and the interface of the oil-water stratification. The control system 6 coordinates the oil discharge and water drainage components according to the received liquid level and interface signals to ensure that the low-flash-point oil level is higher than the low-flash-point oil drain port while the oil-water stratification interface is lower than the low-flash-point oil drain port.

[0124] In order to ensure the continuity and stability of the efficient cutting process of pyrolysis oil and gas, the high flash point oil circulation spray component 209 and the low flash point oil circulation spray component 311 adopt the same detachable structural design, with the flange 2091, oil spray pipe 2092, nozzle mounting seat 2093 and nozzle 2094 connected in sequence. A diameter ball valve 2095 is installed on the oil spray pipe 2092. When the spray component encounters a problem, there is no need to shut down. Simply close the diameter ball valve to disconnect it from the pipeline, and then remove the nozzle and perform maintenance. The specific structure of the high flash point oil circulation spray component 209 is as follows: Figure 3 shown.

[0125] In order to maintain the material balance and pressure stability inside the pyrolysis system, the Roots blower 4 continuously draws the non-condensable gas output by the pyrolysis oil and gas condensation module 3 to the non-condensable gas pressure-stabilizing delivery module 5 .

[0126] In order to improve the stability and reliability of the non-condensable gas supply, the non-condensable gas pressure-stabilizing tank 501 buffers the non-condensable gas input by the pyrolysis oil and gas condensation module inside the tank and maintains the pressure stable. When the pyrolysis system is started or there is a problem with the non-condensable gas circulation, it can still ensure the continuous supply of non-condensable gas, leaving sufficient time for emergency repair and maintenance of the equipment.

[0127] In order to achieve efficient energy utilization of non-condensable gas, a circulating non-condensable gas outlet and a surplus non-condensable gas outlet are set at the lower part of the non-condensable gas pressure-regulating tank 501. The circulating non-condensable gas outlet transports the circulating non-condensable gas to the circulating non-condensable gas inlet 211 of the pyrolysis oil and gas efficient cutting module 2 through a pipeline. A circulating non-condensable gas flow regulating valve 502 and a circulating non-condensable gas flow meter 503 are arranged on the pipeline. The control system adjusts the opening of the flow regulating valve according to the medium-temperature oil and gas temperature measuring point and the indication of the circulating non-condensable gas flow meter, and fine-tunes the flash point cutting temperature of the pyrolysis oil and gas by controlling the flow rate of the circulating non-condensable gas. The surplus non-condensable gas outlet sends the surplus non-condensable gas back to the hot blast furnace 101 in the waste rubber pellet pyrolysis module 1 as fuel through a pipeline to participate in combustion. A surplus non-condensable gas flow regulating valve 504 and a surplus non-condensable gas flow meter 505 are arranged on the pipeline. The control system controls the flow rate of the surplus non-condensable gas entering the hot blast furnace according to the combustion working condition of the hot blast furnace.

[0128] In order to achieve the goal of precise control of efficient cutting and value-added of pyrolysis oil and gas, the control module 6 receives signals such as temperature, flow and liquid level measured by instruments at various points, monitors and judges the status of key operating parameters in real time, and then issues action instructions to controlled objects such as pumps, valves, and heat exchangers in combination with pre-set control targets and control logic, thereby realizing precise control of the efficient cutting and value-added process of pyrolysis oil and gas.

[0129] The embodiments described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pyrolysis oil and gas cutting device, characterized in that: include: The waste rubber pellet pyrolysis module is used to pyrolyze the waste rubber pellets into high-temperature pyrolysis oil and gas and carbon black, and transport them to the pyrolysis oil and gas high-efficiency cutting module and the carbon black post-processing module through the pyrolysis oil and gas outlet and the carbon black outlet respectively; The pyrolysis oil and gas high-efficiency cutting module is used to cut and condense high-temperature pyrolysis oil and gas, and the flash point cutting temperature is 140℃~160℃; specifically, the pyrolysis oil and gas high-efficiency cutting module includes a descending spray tower, an ascending spray tower and a horizontal tower kettle; the top of the descending spray tower is provided with a cooling water spray component, and the lower part is provided with a circulating non-condensable gas inlet; the upper parts of the descending spray tower and the ascending spray tower are both provided with multiple high-flash point oil circulation spray components, and the upper part of the ascending spray tower is provided with a high-flash point oil mist separation filler; the high-temperature pyrolysis oil and gas enter from the upper part of the descending spray tower, and by adjusting the cooling water The flow rate of the spray component, the flow rate of the high-flash-point oil circulation spray component, and the flow rate of the circulating non-condensable gas inlet are used to achieve the cutting and condensation of the pyrolysis oil and gas. The obtained high-flash-point oil is condensed in the horizontal tower kettle. The medium-temperature pyrolysis oil and gas enter the pyrolysis oil and gas condensation module from the upper part of the ascending spray tower for further condensation and separation. The high-flash-point oil is drawn out from the lower part of the horizontal tower kettle through a pipeline equipped with a high-flash-point oil circulation pump and then divided into two paths. One path is connected to the high-flash-point oil circulation spray component through a pipeline with an electric regulating valve, and the other path is connected to the high-flash-point oil storage tank through a pipeline with a high-flash-point oil drain valve. The pyrolysis oil and gas condensation module is used to condense the liquid phase components in the medium-temperature pyrolysis oil and gas leaving the pyrolysis oil and gas high-efficiency cutting module, and perform gas-liquid separation on the condensed droplets. The condensation products are low-flash point oil and water; Roots blower, used to draw the non-condensable gas output from the pyrolysis oil and gas condensation module to the non-condensable gas pressure-stabilizing transmission module; The non-condensable gas pressure-stabilizing and conveying module is used to buffer the non-condensable gas input from the pyrolysis oil and gas condensation module, and convey the non-condensable gas to the waste rubber pellet pyrolysis module and the pyrolysis oil and gas high-efficiency cutting module through pipelines and valves; The control module is used to receive the temperature and flow signals measured by instruments at various points, realize real-time monitoring of various operating parameters, and rely on control logic to achieve the purpose of efficient and precise control of pyrolysis oil and gas cutting.

2. The pyrolysis oil and gas cutting device according to claim 1, characterized in that: The waste rubber pellet pyrolysis module includes a hot air furnace, a conical hopper, a pyrolysis furnace, a carbon black post-processing module and a flue gas treatment system; the pyrolysis furnace includes a central flue gas pipe, a pyrolysis spiral and a jacketed flue gas pipe which are sequentially arranged from the inside to the outside; Among them, one end of the pyrolysis spiral is provided with an inlet for waste rubber particles and is connected to a conical hopper, and the other end is provided with a pyrolysis oil and gas outlet and a carbon black outlet; the pyrolysis oil and gas outlet is connected to the high-temperature pyrolysis oil and gas inlet at the top of the descending spray tower through a pipeline, and the carbon black outlet is connected to the carbon black post-processing module through a pipeline; the inlet of the central flue gas pipe and the jacketed flue gas pipe is connected to the outlet of the hot air furnace, and the outlet is connected to the inlet of the flue gas treatment system.

3. The pyrolysis oil and gas cutting device according to claim 1, characterized in that: In the pyrolysis oil and gas efficient cutting module, the cooling water spray component sprays cooling water into the interior of the downward spray tower. On the one hand, the cooling water vaporizes and absorbs a large amount of phase change latent heat to fully condense the pyrolysis oil and gas; on the other hand, the generated water vapor reduces the partial pressure of the low-flash point components in the oil and gas, causing them to continuously migrate from the liquid phase to the gas phase, thereby reducing the proportion of low-flash point components dissolved in the high-flash point oil, and increasing the safety margin of the oil flash point to ≥60°C. On the premise of ensuring that the oil flash point meets the standard, the minimum flash point cutting temperature required for the condensation of the high-flash point oil is further reduced, thereby improving the yield of the high-flash point oil; The circulating non-condensable gas inlet introduces condensed non-condensable gas into the downward spray tower. Similar to the working principle of water vapor, the introduced circulating non-condensable gas greatly reduces the partial pressure of low flash point components in the oil and gas, effectively improving the yield of high flash point oil.

4. The pyrolysis oil and gas cutting device according to claim 1, characterized in that: The circulating non-condensable gas inlet includes a gas pipeline and a nozzle; The nozzle adopts a flat nozzle, and the nozzle angle is adjustable for rotation, which is used to generate multi-angle fan-shaped airflow, which is conducive to the full mixing of pyrolysis oil and gas and circulating non-condensable gas; the gas transmission pipeline adopts a four-corner tangential circle layout, and the airflow of circulating non-condensable gas forms a strong rotation inside the tower body of the downward spray tower, thereby enhancing the mixing of pyrolysis oil and gas and circulating non-condensable gas.

5. The pyrolysis oil and gas cutting device according to claim 1, characterized in that: The pyrolysis oil and gas condensation module includes a condensation tower, which is equipped with a low-flash point oil circulation spray component, a condensation tower kettle liquid level gauge and a condensation tower non-condensable gas outlet; Among them, the top of the condensing tower is provided with a medium-temperature pyrolysis oil and gas inlet, which sends the medium-temperature pyrolysis oil and gas from the pyrolysis oil and gas high-efficiency cutting module into the inside of the condensing tower; the lower part of the condensing tower is connected to the low-flash point oil through a pipeline equipped with a low-flash point oil circulation pump, and then divided into two paths, one of which is connected to the low-flash point oil circulation spray component arranged on the upper part of the condensing tower through a circulating spray oil pipeline with a water-cooled heat exchanger and a low-flash point oil circulation flow regulating valve, and the other is connected to the low-flash point oil storage tank through a pipeline with a valve; the bottom of the condensing tower is connected to the cooling water spray component on the top of the descending spray tower of the pyrolysis oil and gas high-efficiency cutting module through a cooling water spray pipeline equipped with a bypass regulating valve and a cooling spray water pump; the non-condensable gas outlet of the condensing tower is connected to the non-condensable gas pressure stabilizing and conveying module through a pipeline with an oil mist filter, a non-condensable gas temperature measuring point and a Roots blower.

6. The pyrolysis oil and gas cutting device according to claim 5, characterized in that: The high-flash-point oil circulation spray component and the low-flash-point oil circulation spray component have the same structure, both including a flange, an oil spray pipe, a nozzle mounting seat and a nozzle that are connected in sequence. The oil spray pipe is equipped with a full-diameter ball valve. When the spray component encounters a problem, there is no need to shut down. Just close the full-diameter ball valve to disconnect it from the pipeline, and then you can take out the nozzle and repair it.

7. The pyrolysis oil and gas cutting device according to claim 1, characterized in that: The non-condensable gas pressure stabilizing and conveying module includes a non-condensable gas pressure stabilizing tank and a non-condensable gas pressure stabilizing regulating valve. The non-condensable gas outlet of the condensing tower of the pyrolysis oil and gas condensation module is connected to the top inlet of the non-condensable gas pressure stabilizing tank through a pipeline. The lower part of the non-condensable gas pressure stabilizing tank is provided with a circulating non-condensable gas outlet and a surplus non-condensable gas outlet. The circulating non-condensable gas outlet is connected to the circulating non-condensable gas inlet at the lower part of the downward spray tower of the pyrolysis oil and gas high-efficiency cutting module through a circulating non-condensable gas pipeline with a regulating valve and a flow meter, and the surplus non-condensable gas outlet is connected to the hot air furnace of the waste rubber crumb pyrolysis module through a surplus non-condensable gas pipeline with a regulating valve and a flow meter.

8. The pyrolysis oil and gas cutting device according to claim 7, characterized in that: The control module includes a control system and a thermocouple, a flow meter, an electric regulating valve and a water-cooled heat exchanger connected to the control system; Among them, the thermocouple is arranged at the horizontal tower kettle temperature measuring point of the pyrolysis oil and gas high-efficiency cutting module, the medium-temperature pyrolysis oil and gas outlet temperature measuring point of the upward spray tower, and the non-condensable gas outlet temperature measuring point of the condensing tower of the pyrolysis oil and gas condensing module; the flow meter is arranged on the cooling water spray pipeline of the pyrolysis oil and gas condensing module, the circulating non-condensable gas pipeline and the surplus non-condensable gas pipeline of the non-condensable gas pressure stabilizing and conveying module; the electric regulating valve is arranged on the high flash point oil circulation spray pipeline of the pyrolysis oil and gas high-efficiency cutting module, the low flash point oil circulation spray pipeline and the cooling water spray pipeline bypass of the pyrolysis oil and gas condensing module, the circulating non-condensable gas pipeline and the surplus non-condensable gas pipeline of the non-condensable gas pressure stabilizing and conveying module; the water-cooled heat exchanger is arranged on the low flash point oil circulation spray oil pipeline of the pyrolysis oil and gas condensing module.

9. A pyrolysis oil and gas cutting method, characterized in that: Using the pyrolysis oil and gas cutting device according to any one of claims 1 to 8 specifically comprises the following steps: Step 1: Turn on the hot air furnace of the waste rubber pellet pyrolysis module, introduce high-temperature flue gas into the flue gas duct, and heat the pyrolysis furnace; Step 2: Start the pyrolysis screw, and the waste rubber particles enter the pyrolysis furnace through the conical hopper, where they are rapidly pyrolyzed to generate high-temperature pyrolysis oil and gas and carbon black; Step 3: The carbon black enters the carbon black post-processing module for further processing; Step 4: The high-temperature pyrolysis oil and gas enter the pyrolysis oil and gas efficient cutting module, and the high-flash point oil condenses at the bottom of the horizontal tower, achieving efficient cutting and condensation of the pyrolysis oil and gas; Step 5: The medium-temperature pyrolysis oil and gas enter the pyrolysis oil and gas condensation module for further condensation, and the low-flash point oil and water condense at the bottom of the condensation tower and separate into layers; Step 6: The condensed water is sent back to the pyrolysis oil and gas efficient cutting module to participate in the condensation of the high-temperature pyrolysis oil and gas; Step 7: The remaining non-condensable gas after condensation enters the non-condensable gas pressure stabilization and delivery module and is buffered in the non-condensable gas pressure stabilization tank; Step 8: The buffered non-condensable gas is sent to the pyrolysis oil and gas efficient cutting module to participate in the condensation of high-temperature pyrolysis oil and gas; the surplus non-condensable gas is sent to the hot air furnace for combustion utilization; In step 9, the flue gas enters the flue gas treatment system after heat utilization, part of the flue gas is recycled, and the excess flue gas is discharged, effectively reducing the heat loss of flue gas.

10. The pyrolysis oil and gas cutting method according to claim 9, characterized in that: In step 4, the specific control objectives and logic for achieving efficient cutting and condensation of pyrolysis oil and gas are as follows: To achieve efficient cutting and value-added of pyrolysis oil and gas, the internal temperature of the horizontal tower kettle of the pyrolysis oil and gas efficient cutting module needs to be controlled within the range of 140℃ to 160℃, and this should be used as the primary control target. To ensure sufficient condensation of pyrolysis oil and gas, the internal temperature of the condensation tower of the pyrolysis oil and gas condensation module needs to be controlled within the range of 20℃ to 30℃, and this should be used as the secondary control target. To achieve the main control target, the following control logic is formed: the preliminary temperature control target is set at 130℃~170℃. If the preliminary temperature control target is not met, the temperature measured at the horizontal tower bottom oil temperature measuring point is used as the basis, and the cooling water spray flow rate is controlled by adjusting the opening of the electric control valve of the cooling water spray pipeline bypass in the pyrolysis oil and gas condensation module to meet the preliminary temperature control target; after meeting the preliminary temperature control target, if the main control target is still not met, the circulating non-condensable gas flow rate is controlled by adjusting the opening of the electric control valve of the circulating non-condensable gas pipeline in the non-condensable gas pressure-stabilizing transmission module based on the temperature measured at the medium-temperature pyrolysis oil and gas outlet temperature measuring point of the upward spray tower in the pyrolysis oil and gas high-efficiency cutting module to meet the main control target; In order to achieve the secondary control target, the following control logic is formed: if the secondary control target requirement is not met, the temperature measured at the non-condensable gas outlet temperature measuring point of the condensing tower in the pyrolysis oil and gas condensation module is used as the basis, and the cooling water volume of the water-cooled heat exchanger and the opening of the low-flash point oil circulation flow regulating valve are adjusted to control the size of the spray flow while keeping the low-flash point circulating oil temperature unchanged, thereby realizing automatic control of the medium-temperature pyrolysis oil and gas condensation temperature to meet the secondary control target requirement.

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