Environment-friendly petrochemical waste residue resource conversion system

Abstract

The invention discloses an environment-friendly petrochemical waste residue resource conversion system. The system comprises a feed pretreatment unit, a catalytic cracking reaction unit, a gas-solid separation and quenching unit, an oil-gas condensation separation unit and a tail gas purification treatment unit which are connected in sequence, the feeding pretreatment unit comprises a sealed storage bin, a double-screw conveyor and a quantitative feeder. Long-chain organic matters and heavy components in the waste residues are decomposed to the maximum extent through the catalytic cracking unit at a low temperature, energy consumption is remarkably reduced, and the yield of a target product is increased; due to the multi-stage separation and purification design, high purity of gas-phase and solid-phase products is ensured, heavy metals and dust are effectively intercepted, and secondary pollution is completely eradicated; final products (combustible gas, fuel oil and carbon materials) have direct utilization value, the purpose of really turning waste into wealth is achieved, the tail gas treatment unit adopts a combined technology to ensure that emission reaches the standard, and the whole system is high in automation degree and stable in operation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of petroleum chemical industry, and particularly relates to an environmentally-friendly petroleum chemical waste residue resource conversion system. BACKGROUND

[0002] In the production process of petroleum chemical industry, a large amount of solid waste residues with complex components, strong toxicity and high treatment difficulty are inevitably generated. In the past, these waste residues were mainly treated by landfill or incineration. However, the landfill treatment method has obvious disadvantages. Not only a large amount of land resources are occupied, but also the heavy metals and organic matters in the waste residues may contaminate the surrounding soil and groundwater through the leaching effect over time, causing long-term environmental hazards. Although the incineration treatment can reduce the volume and weight of the waste residues, toxic substances such as dioxins and furans are easily generated in the incineration process. Moreover, this treatment method cannot fully tap and recycle the resource value contained in the waste residues.

[0003] At present, although some physical and chemical treatment methods or single resource recycling processes have been applied to waste residue treatment, these technologies generally have many deficiencies, such as dispersed treatment process, large energy consumption, insufficient control of secondary pollution, low resource conversion efficiency, and low added value of the produced products. SUMMARY

[0004] In view of the above problems, the environmentally-friendly petroleum chemical waste residue resource conversion system is provided to overcome the defects of the prior art and effectively solve the problems in the background.

[0005] To achieve the above object, the application provides the following technical scheme: an environmentally-friendly petroleum chemical waste residue resource conversion system, comprising a feed pretreatment unit, a catalytic cracking reaction unit, a gas-solid separation and quenching unit, an oil-gas condensation separation unit and a tail gas purification treatment unit connected in sequence.

[0006] The feed pretreatment unit comprises a sealed storage bin, a double-screw conveyor and a quantitative feeder. The sealed storage bin is used for temporarily storing petroleum chemical waste residues, and the bottom thereof is connected with the inlet of the double-screw conveyor. The outlet of the double-screw conveyor is connected with the inlet of the quantitative feeder. The outlet of the quantitative feeder is connected with the feed inlet of the catalytic cracking reaction unit, and is used for continuously, uniformly and controllably feeding the waste residues into the reactor.

[0007] The catalytic cracking reaction unit comprises a horizontal rotary reactor, an electric heating system and a catalyst charging system. The horizontal rotary reactor is internally provided with stirring paddles and externally wrapped with the electric heating system. The internal working temperature of the horizontal rotary reactor is set to 350-550 DEG C. The catalyst charging system is communicated with the inside of the horizontal rotary reactor through a metering pump and a pipeline, and is used for quantitatively adding a solid acid catalyst or a composite metal oxide catalyst to the reaction material.

[0008] The gas-solid separation and quenching unit comprises a high-temperature cyclone separator, a connecting pipeline, a quenching tower and a bag-type dust collector. The inlet of the high-temperature cyclone separator is connected to the gas-solid product outlet of the catalytic cracking reaction unit through a high-temperature pipeline. The gas phase outlet of the high-temperature cyclone separator is connected to the bottom inlet of the quenching tower. The solid phase outlet of the high-temperature cyclone separator is connected to a residue collection tank. The top of the quenching tower is provided with a spraying system. The spraying medium is circulating cooling water, which is used to rapidly cool the high-temperature cracking gas to below 100℃, inhibit the generation of dioxin, and wash and remove part of the tar and dust. The top outlet of the quenching tower is connected to the inlet of the bag-type dust collector.

[0009] The oil and gas condensation separation unit comprises a multi-stage condenser, a gas-liquid separation tank and an oil-water separator. The outlet of the bag-type dust collector is connected to the inlet of the multi-stage condenser. The multi-stage condenser adopts a gradient cooling design. The first stage condensing temperature range is 80-150℃, and the second stage condensing temperature range is 30-60℃, which is used to fractionally condense different fractions of the cracking gas. The liquid phase outlet of the multi-stage condenser is connected to the gas-liquid separation tank. The gas phase outlet of the multi-stage condenser is connected to a subsequent pipeline. The liquid phase outlet at the bottom of the gas-liquid separation tank is connected to the oil-water separator. The separated oil phase enters a fuel oil storage tank, and the water phase enters a sewage treatment system.

[0010] The tail gas purification treatment unit comprises an induced draft fan, an activated carbon adsorption tower and an alkali liquor spraying tower. The gas phase outlet of the multi-stage condenser is connected to the bottom inlet of the activated carbon adsorption tower through the induced draft fan, which is used to adsorb and remove residual trace VOCs and heavy metal vapors in the tail gas. The top outlet of the activated carbon adsorption tower is connected to the lower inlet of the alkali liquor spraying tower. The alkali liquor spraying tower is provided with a spraying layer. The spraying cycle alkali liquor is used to remove acidic gas components in the tail gas. The purified tail gas is discharged through the chimney at the top of the alkali liquor spraying tower.

[0011] Preferably, the quantitative feeder is a variable frequency speed regulation star-type feeder or a double gate valve. A nitrogen sealing device is arranged between the outlet of the quantitative feeder and the feed inlet of the catalytic cracking reaction unit, which is used to isolate air from entering the reaction system.

[0012] Preferably, the nitrogen sealing device comprises a ring-shaped nitrogen cavity surrounding the feed outlet and a pressure sensor. Low-pressure nitrogen is continuously introduced into the ring-shaped cavity to form an air curtain barrier.

[0013] Preferably, the stirring paddle of the horizontal rotary reactor is designed as a variable pitch spiral, and a wear-resistant alloy lining plate is embedded on the surface of the paddle. The electric heating system adopts a sectional independent temperature control, which is divided into a preheating section, a main reaction section and a heat preservation section along the length direction of the reactor.

[0014] Preferably, the catalyst filling system comprises a catalyst storage tank, a loss-in-weight metering scale and a screw conveyor. The catalyst is quantitatively added into the reactor from the storage tank through the screw conveyor. The addition point is located at the starting position of the main reaction section.

[0015] Preferably, the catalyst is a HZSM-5 molecular sieve catalyst modified by rare earth elements or a supported alumina-zinc oxide composite catalyst, and the particle size range is 0.5-3mm.

[0016] Preferably, the bottom of the quenching tower is provided with a circulating water pool, cooling coils and a circulating water pump, the sprayed water is collected at the tower bottom, enters the circulating water pool, is cooled by the cooling coils, and is pressurized by the circulating water pump and delivered to the tower top spraying system for recycling use; the circulating water pool is provided with a regular blowdown port connected to a sewage treatment system.

[0017] Preferably, the quenching tower is filled with a regular ceramic packing layer below the spraying system, for increasing the gas-liquid contact area and cooling efficiency.

[0018] Preferably, the first stage of the multi-stage condenser is a shell-and-tube condenser, and the second stage is a finned tube water cooler; the oil-water separator is a horizontal three-phase separator, equipped with a coalescing packing layer and an automatic oil-water interface detection control system.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application maximizes the decomposition of long-chain organic matter and heavy components in waste residues at a lower temperature through the catalytic cracking unit, significantly reduces energy consumption and improves the yield of target products; the multi-stage separation and purification design ensures high purity of gas-phase and solid-phase products, effectively traps heavy metals and dust, and eliminates secondary pollution; the final products (combustible gas, fuel oil and carbon materials) have direct utilization value, realizing true "waste into treasure", and the tail gas treatment unit adopts a combined technology to ensure that the emissions meet the standards, and the entire system has high automation degree and stable operation. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0022] Figure 1 It is a schematic diagram of the present application.

[0023] In the drawings: 100, feed pretreatment unit; 101, sealed storage bin; 102, double screw conveyor; 103, dosing device; 104, nitrogen sealing device;

[0024] 200, catalytic cracking reaction unit; 201, horizontal rotary reactor; 202, electric heating system; 203, catalyst filling system;

[0025] 300. Gas-solid separation and quenching unit; 301. High-temperature cyclone separator; 302. Quenching tower; 303. Bag filter; 304. Residue collection tank; 305. Circulating water tank; 306. Cooling coil; 307. Circulating water pump;

[0026] 400. Oil-gas condensation and separation unit; 401. Multistage condenser; 402. Gas-liquid separator; 403. Oil-water separator; 404. Fuel oil storage tank;

[0027] 500. Exhaust gas purification and treatment unit; 501. Exhaust fan; 502. Activated carbon adsorption tower; 503. Alkali spray tower; 504. Tower top chimney. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] Depend on Figure 1 The present invention discloses an environmentally friendly petrochemical waste residue resource conversion system, comprising a feed pretreatment unit 100, a catalytic cracking reaction unit 200, a gas-solid separation and quenching unit 300, an oil-gas condensation separation unit 400, and a tail gas purification treatment unit 500 connected in sequence.

[0030] The feed pretreatment unit 100 includes a sealed storage bin 101, a twin-screw conveyor 102, and a quantitative feeder 103. The sealed storage bin 101 is used to temporarily store petrochemical waste residue. Its bottom is connected to the inlet of the twin-screw conveyor 102. The outlet of the twin-screw conveyor 102 is connected to the inlet of the quantitative feeder 103. The outlet of the quantitative feeder 103 is connected to the feed port of the catalytic cracking reaction unit 200, which is used to continuously, uniformly, and controllably feed the waste residue into the reactor.

[0031] After being temporarily stored in the sealed storage silo 101, the petrochemical waste residue is broken up by a twin-screw conveyor 102 and transported to the quantitative feeder 103. The feeding rate is controlled by frequency conversion speed regulation to ensure that the waste residue enters the reaction system continuously and uniformly. The nitrogen sealing device 104 forms an inert gas curtain at the feed port to prevent oxygen from entering, thus preventing the risk of combustion and explosion in the high-temperature reaction zone and reducing the emission of volatile organic compounds.

[0032] The catalytic cracking reaction unit 200 includes a horizontal rotary reactor 201, an electric heating system 202, and a catalyst feeding system 203. The horizontal rotary reactor 201 is equipped with stirring blades inside and is wrapped with the electric heating system 202 outside. The internal working temperature of the horizontal rotary reactor 201 is set to 350-550℃. The catalyst feeding system 203 is connected to the inside of the horizontal rotary reactor 201 through a metering pump and pipeline, and is used to quantitatively add solid acid catalysts or composite metal oxide catalysts to the reactants.

[0033] The waste residue is agitated by stirring blades within a horizontal rotary reactor 201, while the electric heating system 202 provides zoned temperature control (preheating section: 200-300℃, main reaction section: 350-550℃, insulation section: 300-400℃). A solid catalyst is quantitatively added to the main reaction section via a dosing system 203, catalyzing the cracking of long-chain hydrocarbons and heavy components in the waste residue, decomposing them into small-molecule gases, light oil and gas, and solid carbon residue. The rotary design enhances mass and heat transfer, and the catalyst lowers the activation energy for cracking, achieving low-temperature, high-efficiency conversion.

[0034] The gas-solid separation and quenching unit 300 includes a high-temperature cyclone separator 301, connecting pipes, a quenching tower 302, and a bag filter 303. The inlet of the high-temperature cyclone separator 301 is connected to the gas-solid product outlet of the catalytic cracking reaction unit 200 through a high-temperature pipe. Its gas phase outlet is connected to the bottom inlet of the quenching tower 302, and its solid phase outlet is connected to the residue collection tank 304. The top of the quenching tower 302 is equipped with a spray system, and the spray medium is circulating cooling water, which is used to rapidly cool the high-temperature cracked gas to below 100°C, inhibit the formation of dioxins, and wash away some tar and dust. The top outlet of the quenching tower 302 is connected to the inlet of the bag filter 303.

[0035] High-temperature pyrolysis gas carrying solid residue enters cyclone separator 301, where particles >10μm are separated into residue collection tank 304 under centrifugal force. The gas phase then enters quench tower 302, where it is instantly cooled to <100℃ by circulating cooling water (20-40℃) sprayed from the top, inhibiting dioxin synthesis and condensing and removing heavy tar. After the gas flow passes through a ceramic packing layer to enhance gas-liquid contact, it enters bag filter 303 to collect remaining micron-sized dust.

[0036] The oil-gas condensation and separation unit 400 includes a multi-stage condenser 401, a gas-liquid separator 402, and an oil-water separator 403. The outlet of the bag filter 303 is connected to the inlet of the multi-stage condenser 401. The multi-stage condenser 401 adopts a gradient cooling design, with the first-stage condensation temperature ranging from 80 to 150°C and the second-stage condensation temperature ranging from 30 to 60°C, used for staged condensation of different distillate oils in the cracked gas. The liquid phase outlet of the multi-stage condenser 401 is connected to the gas-liquid separator 402, and the gas phase outlet is connected to the subsequent pipeline. The liquid phase outlet at the bottom of the gas-liquid separator 402 is connected to the oil-water separator 403. The separated oil phase enters the fuel oil storage tank 404, and the water phase enters the sewage treatment system.

[0037] The cracked gas passes through a multi-stage condenser: a first-stage tube condenser (80-150℃) condenses medium-grade distillate oil (diesel component), and a second-stage finned water cooler (30-60℃) condenses light-grade oil (gasoline component). Uncondensed gas enters a gas-liquid separator 402 to remove entrained droplets, while the liquid phase enters an oil-water separator 403, where coalescing packing and an interface control system separate the oil phase (fuel oil), water phase (phenol-containing wastewater), and trace solid impurities.

[0038] The exhaust gas purification unit 500 includes an induced draft fan 501, an activated carbon adsorption tower 502, and an alkaline spray tower 503. The gas phase outlet of the multi-stage condenser 401 is connected to the bottom inlet of the activated carbon adsorption tower 502 through the induced draft fan 501, which is used to adsorb and remove residual trace VOCs and heavy metal vapors in the exhaust gas. The top outlet of the activated carbon adsorption tower 502 is connected to the lower inlet of the alkaline spray tower 503. The alkaline spray tower 503 is equipped with a spray layer and sprays circulating alkaline solution to remove acidic gas components in the exhaust gas. The purified exhaust gas is discharged in compliance with standards through the chimney 504 at the top of the alkaline spray tower 503.

[0039] The induced draft fan 501 sends the remaining non-condensable gas into the activated carbon adsorption tower 502, where the activated carbon bed adsorbs residual VOCs (benzene compounds, aldehydes) and heavy metal vapors (such as mercury and arsenic). The gas flow then enters the alkaline spray tower 503, where it comes into countercurrent contact with the circulating NaOH solution to neutralize acidic gases (H2S, HCl, SO2). After the purified exhaust gas passes the test and meets the standards, it is discharged through the chimney (504).

[0040] The quantitative feeder 103 is a variable frequency speed-regulating star feeder or a double gate valve. A nitrogen sealing device 104 is provided between its outlet and the feed inlet of the catalytic cracking reaction unit 200 to prevent air from entering the reaction system. The quantitative feeder 103 (star / double gate valve) precisely controls the waste residue feeding rate. The nitrogen sealing device forms a physical barrier to prevent air from seeping into the catalytic cracking reaction unit 200 and causing explosion or coking.

[0041] The nitrogen sealing device 104 includes an annular nitrogen chamber surrounding the feed outlet and a pressure sensor. Low-pressure nitrogen is continuously introduced into the annular chamber to form an air curtain barrier. The annular nitrogen chamber forms an annular air curtain by continuously introducing low-pressure nitrogen (0.1-0.3MPa). The pressure sensor dynamically adjusts the nitrogen flow rate to ensure sealing reliability.

[0042] The horizontal rotary reactor 201 features a variable pitch helical impeller design with wear-resistant alloy liners embedded on its surface. The electric heating system 202 employs independent temperature control in separate zones, divided into a preheating zone, a main reaction zone, and a heat preservation zone along the length of the horizontal rotary reactor 201. The variable pitch helical impeller design propels the material axially, while the wear-resistant liner resists wear from the waste residue. Zoned temperature control allows for a stepped temperature increase in the material, thereby optimizing the pyrolysis reaction path.

[0043] The catalyst addition system 203 includes a catalyst storage tank, a loss-in-weight weighing scale, and a screw conveyor. The catalyst is quantitatively added from the storage tank into the horizontal rotary reactor 201 via the screw conveyor. The addition point is located at the beginning of the main reaction section. The loss-in-weight weighing scale is used to monitor the catalyst consumption in real time. The screw conveyor accurately adds the catalyst to the reaction hot spot area at a set rate (0.5-5 kg / h) to improve catalytic efficiency.

[0044] The catalyst is a rare earth modified HZSM-5 molecular sieve catalyst or a supported alumina-zinc oxide composite catalyst with a particle size range of 0.5-3 mm. The rare earth modified molecular sieve catalyst can enhance the stability of acid centers, and the alumina-zinc oxide composite catalyst is used to promote desulfurization and denitrification. The particle size of 0.5-3 mm can balance the reaction activity and flowability.

[0045] The bottom of the quench tower 302 is equipped with a circulating water tank 305, a cooling coil 306, and a circulating water pump 307. The spray water is collected at the bottom of the quench tower 302 and enters the circulating water tank 305. After being cooled by the cooling coil 306, it is pressurized by the circulating water pump 307 and transported to the spray system at the top of the quench tower 302 for recycling. The circulating water tank 305 is equipped with a periodic sewage outlet connected to the sewage treatment system to achieve periodic sewage discharge and prevent the accumulation of pollutants. The circulating water tank 305 collects the quench spray water, which is cooled by heat exchange in the cooling coil 306 and then recycled, thereby reducing water consumption.

[0046] The quench tower 302 is filled with a regular ceramic packing layer located below the spray system. This layer increases the gas-liquid contact area and cooling efficiency. The use of the ceramic packing layer can increase the gas-liquid contact area, enhance heat and mass transfer, and ensure that the pyrolysis gas drops rapidly to a safe temperature within a short period of time.

[0047] The first stage of the multi-stage condenser 401 is a shell-and-tube condenser, and the second stage is a finned-tube water cooler; the oil-water separator 403 is a horizontal three-phase separator, equipped with a coalescing packing layer and an automatic oil-water interface detection and control system. The shell-and-tube condenser can withstand the scouring of high-temperature oil and gas, and the finned-tube water cooler can enhance heat exchange in the low-temperature section; while the coalescing packing in the three-phase separator accelerates oil-water separation.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly petrochemical waste residue resource conversion system, characterized in that: It includes a feed pretreatment unit (100), a catalytic cracking reaction unit (200), a gas-solid separation and quenching unit (300), an oil-gas condensation separation unit (400), and a tail gas purification treatment unit (500) connected in sequence. The feed pretreatment unit (100) includes a sealed storage bin (101), a twin-screw conveyor (102), and a quantitative feeder (103). The sealed storage bin (101) is used to temporarily store petrochemical waste residue. Its bottom is connected to the inlet of the twin-screw conveyor (102). The outlet of the twin-screw conveyor (102) is connected to the inlet of the quantitative feeder (103). The outlet of the quantitative feeder (103) is connected to the feed port of the catalytic cracking reaction unit (200) to continuously, uniformly, and controllably feed the waste residue into the reactor. The catalytic cracking reaction unit (200) includes a horizontal rotary reactor (201), an electric heating system (202), and a catalyst feeding system (203). The horizontal rotary reactor (201) is equipped with stirring blades inside and is wrapped with an electric heating system (202) outside. The internal working temperature of the horizontal rotary reactor (201) is set to 350-550℃. The catalyst feeding system (203) is connected to the inside of the horizontal rotary reactor (201) through a metering pump and pipeline, and is used to quantitatively add solid acid catalysts or composite metal oxide catalysts to the reactants. The gas-solid separation and quenching unit (300) includes a high-temperature cyclone separator (301), connecting pipes, a quenching tower (302), and a bag filter (303). The inlet of the high-temperature cyclone separator (301) is connected to the gas-solid product outlet of the catalytic cracking reaction unit (200) through a high-temperature pipe. Its gas phase outlet is connected to the bottom inlet of the quenching tower (302), and its solid phase outlet is connected to the residue collection tank (304). The top of the quenching tower (302) is equipped with a spray system. The spray medium is circulating cooling water, which is used to rapidly cool the high-temperature cracked gas to below 100°C, inhibit the formation of dioxins, and wash away some tar and dust. The top outlet of the quenching tower (302) is connected to the inlet of the bag filter (303). The oil-gas condensation and separation unit (400) includes a multi-stage condenser (401), a gas-liquid separator (402), and an oil-water separator (403). The outlet of the bag filter (303) is connected to the inlet of the multi-stage condenser (401). The multi-stage condenser (401) adopts a gradient cooling design. The first-stage condensation temperature range is 80-150℃, and the second-stage condensation temperature range is 30-60℃. It is used for staged condensation of different distillate oils in the cracked gas. The liquid phase outlet of the multi-stage condenser (401) is connected to the gas-liquid separator (402), and the gas phase outlet is connected to the subsequent pipeline. The liquid phase outlet at the bottom of the gas-liquid separator (402) is connected to the oil-water separator (403). The separated oil phase enters the fuel oil storage tank (404), and the water phase enters the sewage treatment system. The exhaust gas purification unit (500) includes an induced draft fan (501), an activated carbon adsorption tower (502), and an alkaline spray tower (503). The gas phase outlet of the multi-stage condenser (401) is connected to the bottom inlet of the activated carbon adsorption tower (502) through the induced draft fan (501) to adsorb and remove residual trace VOCs and heavy metal vapors in the exhaust gas. The top outlet of the activated carbon adsorption tower (502) is connected to the lower inlet of the alkaline spray tower (503). The alkaline spray tower (503) is equipped with a spray layer to spray circulating alkaline solution to remove acidic gas components in the exhaust gas. The purified exhaust gas is discharged through the chimney (504) at the top of the alkaline spray tower (503) in compliance with emission standards.

2. The environmentally friendly petrochemical waste resource conversion system according to claim 1, characterized in that: The quantitative feeder (103) is a variable frequency speed-regulating star feeder or a double gate valve. A nitrogen sealing device (104) is provided between its outlet and the feed inlet of the catalytic cracking reaction unit (200) to prevent air from entering the reaction system.

3. The environmentally friendly petrochemical waste resource conversion system according to claim 2, characterized in that: The nitrogen sealing device (104) includes an annular nitrogen chamber surrounding the feed outlet and a pressure sensor, forming an air curtain barrier by continuously introducing low-pressure nitrogen into the annular chamber.

4. The environmentally friendly petrochemical waste resource conversion system according to claim 1, characterized in that: The horizontal rotary reactor (201) has a variable pitch spiral impeller design and wear-resistant alloy liners embedded on the impeller surface; the electric heating system (202) adopts independent temperature control in sections, which are divided into a preheating section, a main reaction section and a heat preservation section along the length of the reactor.

5. The environmentally friendly petrochemical waste resource conversion system according to claim 4, characterized in that: The catalyst addition system (203) includes a catalyst storage tank, a loss-in-weight weighing scale and a screw conveyor. The catalyst is quantitatively added from the storage tank into the reactor through the screw conveyor, and the addition point is located at the beginning of the main reaction section.

6. The environmentally friendly petrochemical waste resource conversion system according to claim 4, characterized in that: The catalyst is a rare earth element modified HZSM-5 molecular sieve catalyst or a supported alumina-zinc oxide composite catalyst with a particle size range of 0.5-3 mm.

7. The environmentally friendly petrochemical waste resource conversion system according to claim 1, characterized in that: The bottom of the quench tower (302) is equipped with a circulating water tank (305), a cooling coil (306) and a circulating water pump (307). The spray water is collected at the bottom of the tower and enters the circulating water tank (305). After being cooled by the cooling coil (306), it is pressurized by the circulating water pump (307) and transported to the top spray system for recycling. The circulating water tank (305) is equipped with a periodic sewage outlet connected to the sewage treatment system.

8. The environmentally friendly petrochemical waste resource conversion system according to claim 7, characterized in that: The quench tower (302) is filled with a regular ceramic packing layer and is located below the spray system to increase the gas-liquid contact area and cooling efficiency.

9. The environmentally friendly petrochemical waste resource conversion system according to claim 1, characterized in that: The first stage of the multi-stage condenser (401) is a shell-and-tube condenser, and the second stage is a finned-tube water cooler; the oil-water separator (403) is a horizontal three-phase separator, equipped with a coalescing packing layer and an automatic oil-water interface detection and control system.

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