Gasification pyrolysis gas oil washing purification washing tower

Abstract

The utility model discloses a gasification pyrolysis gas oil washing purification washing tower. According to the gasification pyrolysis gas oil washing purification washing tower, a pyrolysis gas inlet is formed in the lower layer of a washing tower shell, a pyrolysis gas outlet is formed in the top of the washing tower shell, and a heavy oil washing area, a heavy oil washing area, a pyrolysis gas washing area and a purification area are sequentially arranged along a gas path in the shell from bottom to top, heavy oil is contained in the heavy oil washing area, and the pyrolysis gas inlet is communicated with a pipeline extending into the position below the liquid level of the heavy oil; an oil-gas separator is arranged on a high-position plate body of the stepped partition plate; the light oil washing tower plate is arranged above the stepped partition plate, and a light oil collecting area is jointly formed by a low-position plate body of the stepped partition plate and the washing tower shell. The problems of poor deoiling and dedusting effects, wastewater generation, high cost, low energy utilization rate and the like when the gasified pyrolysis gas is purified in the prior art are solved, the gasified pyrolysis gas is subjected to oil washing purification through the heavy oil layer and the light oil layer, efficient deoiling and dedusting of the gasified pyrolysis gas are achieved, the cost is low, the energy utilization rate is high, and the advantages of being low in cost, high in energy utilization rate and the like are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pyrolysis gas purification, in particular to a gasification pyrolysis gas oil washing purification washing tower. Background Art

[0002] In industrial production, coal is pyrolyzed to produce gasification pyrolysis gas, which contains a large amount of tar and carries solid particles such as dust. High concentrations of tar and fly ash will condense and block pipelines and equipment. The tar can be divided into heavy oil and light oil according to molecular size and condensation temperature. Appropriate means are needed to purify the gasification pyrolysis gas and separate the heavy oil and light oil to meet production needs.

[0003] The common method at present is to remove dust and tar from the gasified pyrolysis gas by separators, high-temperature electrostatic precipitators, high-temperature particle layer filtration, ceramic or metal filters, etc., and then directly wash and purify the pyrolysis gas. However, direct water washing and cooling will cause poor de-oiling and dust removal effects, large heat loss, large water circulation volume, difficulty in separating oil and water, and difficulty and high cost in wastewater treatment. Chinese patent publication number CN111826211A, published on October 27, 2020, entitled "Method and device for graded condensation of coal tar" discloses a device for condensing and separating coal tar, which uses a multi-stage condensation method to cool and separate the gasified pyrolysis gas, so that it is sequentially heat-exchanged with water vapor, molten salt, heat transfer oil, and cooling water by inter-wall heat exchange to recover the coal tar in the gasified pyrolysis gas step by step. However, when using a heat exchanger for indirect cooling, it is necessary to use a variety of cooling media, with high material cost and large equipment volume. The cooled coal tar is easy to form asphalt to block the pipeline and heat recovery is difficult. Utility Model Content

[0004] The utility model overcomes the problems of poor deoiling and dust removal effect, wastewater generation, high cost, low energy utilization rate, etc. in the prior art when purifying gasification pyrolysis gas, and provides a gasification pyrolysis gas oil washing purification washing tower, which passes the gasification pyrolysis gas through heavy oil and light oil layers for oil washing purification, and cooperates with an oil-gas separator to perform secondary recovery of the heavy oil, and uses the recovered coal tar as a cold source after heat exchange with the outside, does not need to use additional coolant, does not generate wastewater, realizes efficient deoiling and dust removal of gasification pyrolysis gas, has low cost and high energy utilization rate.

[0005] In order to achieve the above purpose, the utility model adopts the following scheme:

[0006] Gasification pyrolysis gas oil washing purification washing tower, the lower layer of the washing tower shell is provided with a pyrolysis gas inlet, the top is provided with a pyrolysis gas outlet, and the gas path in the shell is provided from bottom to top in sequence:

[0007] A heavy oil washing zone, wherein heavy oil is contained inside and a first heavy oil outlet is provided at the bottom, the pyrolysis gas inlet is connected to a pipeline extending below the heavy oil liquid surface, and a heavy oil inlet is provided above the heavy oil liquid surface;

[0008] A stepped partition is arranged in the middle of the washing tower shell, an oil-gas separator is arranged on the high plate of the stepped partition, and a downcomer at the bottom of the oil-gas separator extends downward to below the heavy oil liquid level;

[0009] A light oil washing tower plate is arranged above the step partition plate, a light oil inlet is arranged on the washing tower shell above the light oil washing tower plate, the lower plate body of the step partition plate and the washing tower shell together form a light oil collection area, and a light oil outlet is arranged on the washing tower shell of the light oil collection area.

[0010] Preferably, the light oil washing tower plate is a multi-layer tower plate evenly arranged up and down, and the light oil inlet includes a first light oil inlet, a second light oil inlet and a third light oil inlet, which are respectively arranged at the top, middle and bottom of the multi-layer tower plate.

[0011] Preferably, a demister is provided between the light oil washing tower plate and the pyrolysis gas outlet.

[0012] Preferably, the light oil inlet and the heavy oil inlet are both provided with a spray head or a spray pipe.

[0013] Preferably, a second heavy oil outlet is provided in the middle of the heavy oil washing zone.

[0014] Preferably, the oil-gas separator is a vertical cyclone separator, and the cyclones of the cyclone separator are arranged horizontally along the circumference.

[0015] Preferably, the light oil outlet is connected to a heat exchange cooling device and then connected to the light oil inlet for a light oil heat exchange cycle, and the heavy oil first outlet is connected to a heat exchange cooling device and then connected to the heavy oil inlet for a heavy oil heat exchange cycle.

[0016] Preferably, the space for accommodating the heavy oil in the heavy oil washing zone is a conical funnel-shaped container, the bottom of which is connected to the first outlet of the heavy oil.

[0017] Preferably, the pipeline connected to the pyrolysis gas inlet and the inlet of the oil-gas separator are both provided with a pyrolysis gas distributor.

[0018] Preferably, the diameter of the washing tower shell outside the heavy oil washing zone is larger than the diameter of the washing tower shell outside the area where the oil-gas separator is located, and the two parts of the washing tower shell are connected by a cone section.

[0019] The utility model includes at least the following beneficial effects: (1) The washing tower establishes two liquid levels to wash the gasification pyrolysis gas successively and thoroughly, and uses the principle of like dissolves like to capture oil droplets and oil gas in the airflow with an oil layer. Moreover, due to the high viscosity of the oil, it can better absorb dust, and the washing tower has high deoiling and dust removal efficiency; (2) The temperature and circulation volume of the oil products on the heavy oil washing area and the light oil washing tower plate can be independently controlled, so that the water vapor in the gasification pyrolysis gas remains in a gaseous state until it is discharged from the tower, and the gasification pyrolysis gas does not need to be washed with water, thereby reducing the generation of wastewater; (3) The light oil on the light oil washing tower plate flows downward, and the gasification pyrolysis gas passes upward through the tower plate area. The oil and gas flow in reverse to contact each other, thereby achieving efficient heat transfer and oil and gas recovery. Compared with the traditional plate washing tower, The number of tower plates required is smaller. The light oil and heavy oil used as washing media in the washing tower are separated from the gasification pyrolysis gas and can be recycled. There is no need to purchase additional oil as a coolant, which saves costs and has good economy. (4) The sensible heat of the gasification pyrolysis gas and the entrained heavy oil are recovered through mass and heat transfer between the heavy oil and the gasification pyrolysis gas. The heated heavy oil leaves the washing tower for heat recovery and then enters the circulation. There are fewer heat transfer links and the energy utilization rate is high. (5) By independently controlling the temperature of the heavy oil and light oil in the tower, the fractionation of light oil and heavy oil can be effectively reduced. The heavy oil washing area can retain some light oil components, reduce the condensation temperature of the lower oil, avoid the formation of asphalt to block the equipment and pipelines, and ensure the working stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] In the figure: pyrolysis gas inlet 1, pyrolysis gas outlet 2, heavy oil first outlet 3, heavy oil liquid level 4, heavy oil inlet 5, stepped partition 6, oil-gas separator 7, light oil washing tower plate 8, first light oil inlet 91, second light oil inlet 92, third light oil inlet 93, demister 10, heavy oil second outlet 11, light oil outlet 12. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0023] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0024] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the materials can be obtained from commercial channels unless otherwise specified; in the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood in specific circumstances. The orientation or position relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0025] like Figure 1 As shown, the utility model provides a gasification pyrolysis gas oil washing purification washing tower, the lower layer of the washing tower shell is provided with a pyrolysis gas inlet 1, the top is provided with a pyrolysis gas outlet 2, and the gas path in the shell is provided from bottom to top in sequence:

[0026] A heavy oil washing zone, which contains heavy oil and has a first heavy oil outlet 3 at the bottom, wherein the pyrolysis gas inlet 1 is connected to a pipeline extending below the heavy oil liquid surface 4, and a heavy oil inlet 5 is provided above the heavy oil liquid surface 4;

[0027] A stepped partition 6 is arranged in the middle of the washing tower shell, and an oil-gas separator 7 is arranged on the high plate body of the stepped partition 6. The downcomer at the bottom of the oil-gas separator 7 extends downward to below the heavy oil liquid level 4;

[0028] The light oil washing tower plate 8 is arranged above the stepped partition plate 6. A light oil inlet is arranged on the washing tower shell above the light oil washing tower plate 8. The lower plate body of the stepped partition plate 6 and the washing tower shell together form a light oil collection area. A light oil outlet 12 is arranged on the washing tower shell of the light oil collection area.

[0029] The tower body is in the form of a single tower, and the gas path in the tower is from bottom to top as a whole, and the internal space is divided into upper and lower parts by a stepped partition 6 in the middle. The gasified pyrolysis gas after heavy oil washing rises into the separation zone, and a tank for accommodating heavy oil is set in the heavy oil washing zone. By controlling the flow of the heavy oil inlet 5 and the first heavy oil outlet 3, the depth of the cold heavy oil in the tank is maintained at a set liquid level. The port of the pyrolysis gas inlet 1 is at a distance from the heavy oil liquid surface 4. The gasified pyrolysis gas reaches a sufficient degree of diffusion and washing from entering the heavy oil to leaving the heavy oil liquid surface 4. The first heavy oil outlet 3 and the heavy oil inlet 5 are indirectly connected through an external heat exchange device or heat exchange pipeline for heavy oil circulation. After the device is stably operated, part of the heavy oil is quantitatively and continuously discharged from the system to prevent accumulation. When the gasified pyrolysis gas leaves the heavy oil liquid surface 4, a part of the heavy oil components that cannot be absorbed will remain, and it may take away part of the oil and gas produced by the heavy oil layer. The rising gasified pyrolysis gas enters the air inlet of the oil-gas separator 7, and the small amount of heavy oil carried therein is separated and collected and then transported back to the heavy oil layer in the heavy oil washing area through the downcomer. The air outlet of the oil-gas separator 7 is upwardly connected to the upper side of the stepped partition 6. The downcomer is located at the bottom of the oil-gas separator 7 and the lower end extends below the heavy oil liquid surface 4, ensuring that the total height of the downcomer is higher than the height of the liquid column to form an oil seal, thereby ensuring the normal flow of the airflow.

[0030] When the gasified pyrolysis gas leaves the oil-gas separator 7 and enters the light oil washing tower plate 8, the heavy oil content in the airflow meets the purification requirements, and the gasified pyrolysis gas enters the tower plate area, passes through the air inlet of the light oil washing tower plate 8 and moves upward layer by layer. The light oil input from the light oil inlet forms a light oil layer on the light oil washing tower plate 8. The thickness of the light oil layer reaches the set liquid level, and the gasified pyrolysis gas emerges from the light oil washing tower plate 8 and passes through the light oil layer. The light oil component in the airflow is washed and purified, and the light oil flows downward to the light oil collection area, accumulates, and is discharged from the light oil outlet 12 out of the tower. The light oil outlet 12 and the light oil inlet are indirectly connected through an external heat exchange device or a heat exchange pipeline for light oil circulation. After the device is stably operated, part of the light oil is quantitatively and continuously discharged from the system to prevent accumulation.

[0031] During the operation of this purification washing tower, the gasified pyrolysis gas is introduced into the heavy oil in the heavy oil washing area from the pyrolysis gas inlet 1 of the washing tower. The temperature of the gasified pyrolysis gas discharged from the pyrolysis furnace is 350 to 600 degrees Celsius. The gasified pyrolysis gas entering the washing tower can be pre-dusted by a cyclone dust collector or a venturi scrubber. The gasified pyrolysis gas enters the heavy oil from the air inlet pipe and diffuses. The airflow exchanges heat in the heavy oil layer and drops to the temperature of heavy oil liquefaction, and this temperature is higher than the condensation temperature of light oil. As an example, the temperature of the heavy oil input from the heavy oil inlet 5 is controlled at 130 to 165 degrees Celsius, the temperature of the heavy oil after absorbing heat is controlled at 200 to 250 degrees Celsius, and the temperature of the gasified pyrolysis gas leaving the heavy oil liquid surface 4 is controlled at 205 to 215 degrees Celsius. The cold heavy oil transfers mass and heat with the high-temperature gasified pyrolysis gas, and most of the heavy oil components of the airflow after oil washing are retained in the liquid cold heavy oil; the gasified pyrolysis gas separates from the heavy oil liquid surface 4 and enters the oil-gas separator 7 above, and the small amount of heavy oil remaining in the airflow is separated by the oil-gas separator 7, and the separated heavy oil is collected in the downcomer and flows back into the heavy oil layer to complete the secondary collection of the heavy oil; the gasified pyrolysis gas flowing out of the outlet of the oil-gas separator 7 enters the tower plate area, and the airflow passes through the light oil layer on the light oil washing tower plate 8 and is cooled to the temperature at which the light oil is liquefied. As an example, the temperature of the cold light oil on the light oil washing tower plate 8 is controlled at 60 to 150 degrees Celsius, the temperature of the oil gathered in the light oil collection area is controlled at 150 to 180 degrees Celsius, and the temperature of the gasified pyrolysis gas leaving the tower plate area is controlled at 160 to 200 degrees Celsius. The light oil component in the air flow merges with the light oil on the light oil washing tower plate 8 and is collected in the light oil collection area below. The air flow separated from the light oil layer leaves the washing tower from the pyrolysis gas outlet 2 at the top for subsequent treatment. By adjusting the flow rates of the heavy oil inlet 5, the first heavy oil outlet 3, the light oil inlet, and the light oil outlet 12 respectively, the amount of heavy oil and light oil in the washing tower is controlled and the temperature in the tower is maintained by heat exchange with the outside.

[0032] The scrubber establishes two oil layers of different oil products to wash the gasification pyrolysis gas successively and fully. The oil layer is used to capture the oil droplets and oil gas in the airflow based on the principle of like dissolves like. Due to the high viscosity of the oil, when the gasification pyrolysis gas is passed into the heavy oil, the dust in the airflow is adsorbed and output to the outside of the tower with the heavy oil for filtration and removal. The scrubber has high deoiling and dust removal efficiency and high removal rate. Since the light oil scrubbing trays 8 and the heavy oil scrubbing area on the upper and lower layers of the scrubber are relatively separated in the operating environment, they can be independently controlled. The oil product temperature and circulation volume of the two oil washing areas are controlled so that the gasified pyrolysis gas reaches the temperature at which the oil and gas condense. At the same time, the water vapor in the air flow remains in a gaseous state until it is discharged from the tower, and the gasified pyrolysis gas does not need to be washed with water, thereby reducing the generation of waste water. The light oil on the light oil washing tray 8 flows downward, and the gasified pyrolysis gas passes upward through the tray area. The oil and gas flow in countercurrent to contact each other, thereby achieving efficient heat transfer and oil and gas recovery. Compared with the traditional plate-type washing tower, the number of light oil washing trays 8 required is less, and the washing tower has a plurality of washing trays 8 as washing trays. The light oil and heavy oil of the medium are separated from the gasification pyrolysis gas and can be recycled. There is no need to purchase additional oil as a coolant, which saves costs and has good economy. The sensible heat of the gasification pyrolysis gas is recovered by mass and heat transfer between the heavy oil and the gasification pyrolysis gas. The heated heavy oil leaves the washing tower for heat recovery and then enters the cycle, with fewer heat transfer links and high energy utilization. By independently controlling the temperature of the cold heavy oil and the cold light oil, the fractionation of light oil and heavy oil can be effectively reduced. The heavy oil washing area can retain some light oil components, reduce the condensation temperature of the lower oil layer, avoid the formation of asphalt to block the equipment and pipelines, and ensure the continuous and efficient operation of the equipment. During the working process, the liquid level light oil purification section has a lower temperature, and some heavy oil that has not been completely removed may condense here and enter the bottom of the light oil collection area. The washing tower adopts a single tower connected up and down structure. A liquid guide pipe can be set at the bottom of the light oil collection area to guide the heavy oil accumulated at the bottom into the oil layer of the heavy oil washing area below for oil classification and concentration.

[0033] In another technical solution, the light oil washing tray 8 is a multi-layer tray evenly arranged up and down, and the light oil inlet includes a first light oil inlet 91, a second light oil inlet 92 and a third light oil inlet 93, which are respectively arranged at the upper part, the middle part and the lower part of the multi-layer tray. The number of light oil washing trays 8 is generally set between 4 and 10 to ensure a better purification effect. The cooling oil inlet of the lower tray corresponds to the cooling oil outlet of the upper tray. The light oil inputted by the light oil inlet can flow through each layer of the light oil washing tray 8 and then flow out from the light oil outlet 12. Multiple light oil inlets are set at different levels of the light oil washing tray 8 to control the amount and oil temperature of the light oil on each layer of the light oil washing tray 8.

[0034] The middle of the heavy oil washing zone is provided with a heavy oil second outlet 11. The heavy oil first outlet 3 is provided at the bottom of the heavy oil space in the heavy oil washing zone, and all the heavy oil can be discharged. The heavy oil second outlet 11 can assist in flow regulation and provide a backup outlet.

[0035] In another technical solution, a demister 10 is provided between the light oil washing tray 8 and the pyrolysis gas outlet 2. A small amount of light oil in the form of oil mist and oil foam will remain in the gasified pyrolysis gas after light oil washing. The content of this part of light oil in the gasified pyrolysis gas is extremely low. The demister 10 is provided at the pyrolysis gas outlet 2 to collect the oil mist and oil droplets, which can further improve the removal rate of light oil in the gasified pyrolysis gas.

[0036] The light oil inlet and the heavy oil inlet 5 are both provided with a spray head or a spray pipe. The light oil and heavy oil entering the tower through the spray head and the spray pipe form a cooling oil coverage area, increasing the contact with the gasified pyrolysis gas to achieve a better purification effect.

[0037] In another technical solution, the oil-gas separator 7 is a vertical cyclone separator, and the cyclones of the cyclone separator are arranged horizontally along the circumference. The airflow enters the cyclone separator and acts tangentially on the cyclones. The cyclones rotate at high speed and use the inertial centrifugal force to throw the oil droplets in the airflow onto the wall surface. The oil droplets accumulated on the wall surface are collected in the downcomer at the bottom.

[0038] The light oil outlet 12 is connected to a heat exchange cooling device and then connected to the light oil inlet for light oil heat exchange circulation, and the heavy oil first outlet 3 is connected to a heat exchange cooling device and then connected to the heavy oil inlet 5 for heavy oil heat exchange circulation.

[0039] The space for accommodating heavy oil in the heavy oil washing zone is a conical funnel-shaped container, the bottom of which is connected to the heavy oil first outlet 3. The conical funnel-shaped container can provide a collection function, making it easier to discharge accumulated impurities such as dust from the heavy oil first outlet 3.

[0040] In another technical solution, a pyrolysis gas distributor is provided for both the pipeline connected to the pyrolysis gas inlet 1 and the air inlet of the oil-gas separator 7. The pyrolysis gas distributor of the pyrolysis gas inlet 1 evenly distributes the gasified pyrolysis gas to the heavy oil layer, so that the airflow and the heavy oil are fully in contact for mass and heat transfer, and the pyrolysis gas distributor of the air inlet of the oil-gas separator 7 evenly introduces the gasified pyrolysis gas into each cyclone and other working units in the oil-gas separator 7, so as to achieve an efficient and stable separation effect.

[0041] The diameter of the washing tower shell outside the heavy oil washing area is larger than the diameter of the washing tower shell outside the area where the oil-gas separator 7 is located, and the two parts of the washing tower shell are connected by a cone section. Because the heavy oil washing area needs to accommodate more heavy oil, and the oil-gas separator 7 occupies a small space in the tower body, in order to save costs and ensure the structural stability of the tower body, the washing tower shell at the heavy oil washing area can be larger than the washing tower shell at the oil-gas separator 7, and the two sections of the washing tower shell are connected and transitioned by a cone section.

[0042] The number of devices and processing scales described here are used to simplify the description of the utility model. Applications, modifications and variations of the utility model are obvious to those skilled in the art.

[0043] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Gasification pyrolysis gas oil washing and purification washing tower, characterized in that: The lower layer of the washing tower shell is provided with a pyrolysis gas inlet, and the top is provided with a pyrolysis gas outlet. The following are arranged in sequence from bottom to top along the gas path in the shell: A heavy oil washing zone, wherein heavy oil is contained inside and a first heavy oil outlet is provided at the bottom, the pyrolysis gas inlet is connected to a pipeline extending below the heavy oil liquid surface, and a heavy oil inlet is provided above the heavy oil liquid surface; A stepped partition is arranged in the middle of the washing tower shell, an oil-gas separator is arranged on the high plate of the stepped partition, and a downcomer at the bottom of the oil-gas separator extends downward to below the heavy oil liquid level; A light oil washing tower plate is arranged above the step partition plate, a light oil inlet is arranged on the washing tower shell above the light oil washing tower plate, the lower plate body of the step partition plate and the washing tower shell together form a light oil collection area, and a light oil outlet is arranged on the washing tower shell of the light oil collection area.

2. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1 is characterized in that: The light oil washing tower plate is a multi-layer tower plate evenly arranged up and down, and the light oil inlet includes a first light oil inlet, a second light oil inlet and a third light oil inlet, which are respectively arranged at the top, middle and bottom of the multi-layer tower plate.

3. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1 is characterized in that: A defoamer is arranged between the light oil washing tower plate and the pyrolysis gas outlet.

4. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1 is characterized in that: The light oil inlet and the heavy oil inlet are both provided with a spray head or a spray pipe.

5. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1 is characterized in that: A second heavy oil outlet is arranged in the middle of the heavy oil washing zone.

6. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1 is characterized in that: The oil-gas separator is a cyclone separator of a vertical structure, and the cyclones of the cyclone separator are arranged horizontally along the circumference.

7. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1 is characterized in that: The light oil outlet is connected to the heat exchange cooling device and then connected to the light oil inlet for light oil heat exchange circulation, and the heavy oil first outlet is connected to the heat exchange cooling device and then connected to the heavy oil inlet for heavy oil heat exchange circulation.

8. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1 is characterized in that: The space for accommodating the heavy oil in the heavy oil washing zone is a conical funnel-shaped container, the bottom of which is connected to the first outlet of the heavy oil.

9. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1, characterized in that: The pipeline connected to the pyrolysis gas inlet and the inlet of the oil-gas separator are both provided with a pyrolysis gas distributor.

10. The gasification pyrolysis gas oil washing and purification washing tower according to claim 1, characterized in that: The diameter of the washing tower shell outside the heavy oil washing area is larger than the diameter of the washing tower shell outside the area where the oil-gas separator is located, and the two parts of the washing tower shell are connected by a cone section.

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