阅读说明：本技术 一种燃料-化工型炼油系统及炼油工艺 (Fuel-chemical oil refining system and oil refining process ) 是由 门存贵 李大鹏 黄传峰 任健 蒋中山 于 2018-08-03 设计创作，主要内容包括：本发明公开了一种燃料-化工型炼油系统及炼油工艺。在炼油中技术引入介观尺度的微界面化学反应与传递过程协同强化新理念,开发了以重油乳化床加氢与馏份油乳化固定床加氢在线集成为核心的石油加工新工艺,具有原料适应性强、工艺流程短、投资和生产成本低、能效和资源利用率高、清洁环保等优势。根据本发明所公开的工艺路线及方法,未来燃料-化工型炼油厂无需建设催化裂化、加氢裂化、延迟焦化、重油加氢预处理等加工装置,且乙烯原料供应更加丰富、灵活,可根据市场需要进行油品/化工品比例的的生产调控。(The invention discloses a fuel-chemical oil refining system and an oil refining process. The technology introduces a new concept of synergistic reinforcement of a mesoscale micro-interface chemical reaction and a transfer process in oil refining, develops a new petroleum processing process integrating heavy oil emulsion bed hydrogenation and distillate oil emulsion fixed bed hydrogenation into a core on line, and has the advantages of strong raw material adaptability, short process flow, low investment and production cost, high energy efficiency and resource utilization rate, cleanness, environmental protection and the like. According to the process route and the method disclosed by the invention, the future fuel-chemical type refinery does not need to build processing devices such as catalytic cracking, hydrocracking, delayed coking, heavy oil hydrogenation pretreatment and the like, the ethylene raw material supply is richer and more flexible, and the production regulation and control of the oil product/chemical product ratio can be carried out according to market demands.)

1. A fuel-chemical type oil refining system, characterized in that: the method comprises the steps that an atmospheric distillation device with a crude oil inlet is included, hydrogen from an atmospheric residue, a catalyst and a hydrogen system at the lower end of the atmospheric distillation device is connected with an inlet of an emulsion bed hydrogenation reaction device through a pipeline, a product obtained after the reaction of the emulsion bed hydrogenation reaction device enters an online separation system, a liquid-phase product separated by the online separation system enters a vacuum distillation device for liquid-solid separation, tail oil containing solid substances and extracted from the bottom of the vacuum distillation device enters a hydrogen production device, vacuum distillate oil extracted from a side line of a vacuum distillation tower, straight-run diesel oil extracted from a side line of the atmospheric distillation device, a gas-phase product separated by the online separation system and hydrogen from a hydrogen system enter an emulsion fixed bed hydrogenation device, the product obtained after the reaction of the emulsion fixed bed hydrogenation device enters a gas-liquid separator of the separation system for gas-liquid separation, and a separated gas mixture enters, LPG and unreacted hydrogen entering a hydrogen system through a recycle hydrogen compressor, feeding the separated liquid mixture into a fractionating tower to obtain naphtha, kerosene, diesel oil and wax oil, pumping straight-run naphtha from the tower top of an atmospheric distillation tower and naphtha obtained by the fractionating tower into a catalytic reforming device together to obtain BTX and high-octane gasoline, and feeding the byproduct hydrogen into the hydrogen system through the compressor; refining straight-run kerosene in an atmospheric distillation tower, and modifying the refined straight-run kerosene with kerosene obtained in a fractionating tower to obtain aviation kerosene; straight-run naphtha of the atmospheric distillation tower, wax oil of the fractionating tower and LPG of the gas-gas separation device enter a steam cracking device together to produce olefin.

2. The fuel-chemical type oil refinery system according to claim 1, wherein: the emulsification fixed bed hydrogenation device comprises an emulsification fixed bed hydrofining reactor and an emulsification fixed bed hydrocracking reactor which are connected in series.

3. A fuel-chemical type oil refining process, characterized by comprising the steps of:

a. crude oil enters an atmospheric distillation device, straight-run naphtha is extracted from the top of an atmospheric distillation tower, straight-run kerosene and straight-run diesel are extracted from the side line, and atmospheric residue oil is extracted from the bottom of the tower;

b. the method comprises the steps of enabling atmospheric residue, a catalyst and hydrogen from a hydrogen system to enter an emulsion bed hydrogenation reactor, and carrying out efficient hydrogenation reaction in an emulsion bed hydrogenation device under the operating conditions of pressure of 2-14 MPa, temperature of 400-470 ℃ and airspeed of 0.5-2.0 h^-1The hydrogen-oil ratio is quantitative hydrogen supply, and the product after reaction enters an online separation system and is separated into a gas-phase product and a liquid-phase product containing solid matters;

c. the liquid phase product separated on line in the step b) enters a reduced pressure distillation device for liquid-solid separation, reduced pressure distillate oil is extracted from the side line of the reduced pressure distillation tower, and tail oil containing solid matters is extracted from the bottom of the tower and is used as a gasification raw material to enter a hydrogen production device;

d. step c) vacuum distillate oil extracted from the side line of the vacuum distillation tower, straight-run diesel oil extracted from the side line of the atmospheric distillation device in the step a), gas-phase products separated on line in the step b) and hydrogen from a hydrogen system enter an emulsification fixed bed hydrogenation device, and hydrogenation reaction is carried out through an emulsification fixed bed hydrofining reactor and an emulsification fixed bed hydrocracking reactor which are connected in series in a mode of feeding in and feeding out from the bottom, wherein the operation conditions are that the pressure is 2-14 MPa, the temperature is 300-420 ℃, and the space velocity is 1.0-2.0 h^-1The hydrogen-oil ratio is quantitative hydrogen supply, and the product after reaction enters a separation system for gas-liquid separation;

e. after reaction products of the hydrogenation reaction device of the emulsification fixed bed enter a separation system, gas-liquid separation is carried out by a gas-liquid separation device, the separated gas mixture enters the gas-gas separation device to obtain unreacted hydrogen, dry gas and LPG, and the unreacted hydrogen enters a hydrogen system through a recycle hydrogen compressor; the separated liquid mixture enters a fractionating tower to obtain naphtha, kerosene, diesel oil and wax oil;

f. extracting straight-run naphtha from the top of the atmospheric distillation tower and naphtha obtained by a fractionating tower into a catalytic reforming device for processing to obtain BTX and high-octane gasoline, and feeding the byproduct hydrogen into a hydrogen system through a compressor;

g. refining straight-run kerosene in an atmospheric distillation tower, and modifying the refined straight-run kerosene with kerosene obtained in a fractionating tower to obtain aviation kerosene;

h. straight-run naphtha of the atmospheric distillation tower, wax oil of the fractionating tower and LPG of the gas-gas separation device enter a steam cracking device together to produce olefin.

4. The fuel-chemical refinery process of claim 1, wherein: the catalyst adopted by the hydrogenation device of the emulsion bed in the step b) is an iron-based or molybdenum-based catalyst, and the particle size distribution range of the catalyst is 10-300 mu m.

5. The fuel-chemical refinery process of claim 1, wherein: the sizes of the hydrogen microbubbles of the dispersed phase in the emulsion bed hydrogenation device and the emulsion fixed bed hydrogenation device are 10-1000 mu m, and the gas-liquid ratio phase interface area is 2000-20000 m²/m³。

6. The fuel-chemical refinery process of claim 1, wherein: the emulsion bed hydrogenation device can be used for processing heavy oil with high metal content, high asphaltene content, high solid content, high carbon residue content and high sulfur nitrogen content, wherein the sulfur content in the heavy oil is 0.1-8 wt%, the nitrogen content is 0.1-1.0 wt%, the solid content is 0.01-1 wt%, the metal (Fe + Ni + V) content is 10-2000 ppm, the asphaltene content is 0.1-25 wt%, and the carbon residue content is 1-40 wt%.

7. The fuel-chemical refinery process of claim 1, wherein: the total heavy oil conversion rate of the emulsion bed hydrogenation device is 85-99%, the asphaltene conversion rate is 75-95%, and the hydrogen consumption is 1-3 wt%; the total liquid yield is 85-95 wt%, the tail oil yield is 2-6 wt%, in the total liquid yield, the naphtha fraction accounts for 5-15 wt%, the diesel fraction accounts for 30-40 wt%, and the wax oil fraction accounts for 30-40 wt%; the desulfurization rate is 50-85 wt%, the denitrification rate is 30-50 wt%, and the demetallization rate is more than 90 wt%.

8. The fuel-chemical refinery process of claim 1, wherein: the total liquid yield of the hydrogenation device of the emulsification fixed bed is 95-99%, and the desulfurization rate is 90-99%.

9. The fuel-chemical refinery process of claim 1, wherein: the emulsifying fixed bed hydrogenation device is formed by grading a catalyst with one or more mixed active components of molybdenum, nickel, tungsten and cobalt, and the catalyst is filled in layers in the shape of one or more of clover, clover and dentate sphere.

10. The fuel-chemical refinery process of claim 1, wherein: the density of naphtha obtained by the fractionating tower is 0.70-0.78 kg/cm³Fangxiang Xian>40% and a kerosene density of 0.775-0.83 kg/cm³Freezing point<Diesel oil density at-46 ℃ of 0.80-0.845 kg/cm³Cetane number of>51, the BMCI value of the wax oil is 6-18.

11. The fuel-chemical refinery process of claim 1, wherein: and returning the wax oil obtained by the fractionating tower to the emulsification fixed bed hydrogenation device and entering the emulsification fixed bed hydrocracking reactor.

Technical Field

The invention belongs to the field of petrochemical industry, relates to a brand new technology for petroleum refining, and particularly relates to a fuel-chemical oil refining system and an oil refining process.

Background

The petroleum refining industry can produce fuels such as gasoline, kerosene, diesel oil, BTX, olefin and the like and chemical industrial raw materials, is one of the most important pillar industries of national economy, is related to the economic pulse and energy safety of the country, and has extremely important position and function in the national economy, national defense and social development.

The oil refining technology is developed to the present day, and the whole body is mature. Generally, a refinery of conventional fuel-chemical type includes main processing units such as an atmospheric/vacuum distillation unit, a catalytic cracking unit (FCC), a hydrocracking unit, a delayed coking unit, a catalytic reforming unit, a hydrofinishing unit, and a steam cracking unit, and if crude oil is inferior in properties, a heavy oil hydrogenation pretreatment (RDS) unit is further added. The oil refining process includes the first primary processing of crude oil in an atmospheric/vacuum distillation unit to produce straight run naphtha, straight run kerosene, straight run diesel oil, vacuum distillate oil (VGO, including first line, second line and third line) and vacuum residue. Then, heavy distillate oil including vacuum distillate oil and vacuum residue is generally processed in two to three steps to produce light distillate oil. The vacuum residue enters a delayed coking device to produce coking gas, coking naphtha, coking diesel oil and coking wax oil; the vacuum distillate oil and the coking wax oil enter a hydrocracking device to produce gasoline, aviation kerosene, diesel oil and wax oil and byproduct gas; vacuum distillate oil, hydrocracking wax oil and a small amount of blended residual oil enter a catalytic cracking device to produce catalytic gas, catalytic gasoline, catalytic diesel oil and a small amount of external throwing catalytic slurry oil. Then, various processed distillate oil is refined and modified to be a product. Feeding the hydrocracked naphtha, the catalytic gasoline and the coked naphtha into a catalytic reforming device to produce high-octane gasoline and BTX; the straight-run diesel oil, the catalytic diesel oil and the coking diesel oil enter a fixed bed hydrofining device to produce the diesel oil; the straight run kerosene is refined to produce aviation kerosene. And the byproduct gas can be further recycled. The coking gas, the catalytic gas and the hydrocracking gas are subjected to gas separation to produce dry gas, propylene and LPG (mainly alkane). And finally, taking the straight-run naphtha and the LPG as raw materials, and feeding the raw materials into a steam cracking device to produce an olefin product.

If the properties of the crude oil are poor, the metal content, the asphaltene content and the carbon residue content in the vacuum distillate oil and the vacuum residue oil are high, and the crude oil can be processed in a hydrocracking and catalytic cracking device only by demetalization, asphaltene reduction and carbon residue removal through a heavy oil hydrogenation pretreatment device.

Although the current fuel-chemical type oil refining technology can meet the requirements of petroleum processing, and a single technology in each link is mature, the following four main problems generally exist, which can affect the market competitiveness and the future development of the petroleum processing industry. Firstly, along with the improvement of environmental protection requirements, the quality of oil products is continuously upgraded, the processing flow of oil refining is longer and longer, and the investment and production cost are higher and higher; secondly, the crude oil in the world has development trends of heaviness and deterioration, and the heavy oil catalytic cracking technology, the heavy oil hydrogenation pretreatment technology and the hydrocracking technology have strict limitations on the properties of the raw materials, such as the indexes of metal impurity content, asphaltene content, carbon residue content and the like, and become a key bottleneck of future development; thirdly, the catalytic cracking technology in the oil refining process has the outstanding problems of high gas yield, poor liquid product quality, resource waste (large coke production), environmental pollution and the like in the delayed coking technology; fourthly, the yield of straight-run naphtha in crude oil is low, which results in insufficient supply of raw materials for steam cracking and limited olefin yield.

Disclosure of Invention

The invention aims to change the existing oil refining technical route and process flow and provide a fuel-chemical oil refining system and an oil refining process which have the advantages of wide raw material application, short process flow, high liquid yield, high energy conversion efficiency, low production cost, cleanness and environmental protection.

In order to achieve the purpose, the system comprises an atmospheric distillation device with a crude oil inlet, hydrogen from atmospheric residue, a catalyst and a hydrogen system at the lower end of the atmospheric distillation device is connected with the inlet of an emulsion bed hydrogenation reaction device through a pipeline, a product obtained after the reaction of the emulsion bed hydrogenation reaction device enters an online separation system, a liquid-phase product obtained by the separation of the online separation system enters a vacuum distillation device for liquid-solid separation, tail oil containing solid substances extracted from the bottom of the vacuum distillation device enters a hydrogen production device, vacuum distillate oil extracted from a side line of a vacuum distillation tower, straight-run diesel oil extracted from a side line of the atmospheric distillation device, a gas-phase product obtained by the separation of the online separation system and hydrogen from the hydrogen system enter an emulsion fixed bed hydrogenation device, and a product obtained after the reaction of the emulsion fixed bed hydrogenation device enters a gas-liquid separator of the separation system, the separated gas mixture enters a gas-gas separation device to obtain dry gas, LPG and unreacted hydrogen entering a hydrogen system through a recycle hydrogen compressor, the separated liquid mixture enters a fractionating tower to obtain naphtha, kerosene, diesel oil and wax oil, straight-run naphtha is extracted from the tower top of an atmospheric distillation tower and enters a catalytic reforming device together with the naphtha obtained from the fractionating tower to obtain BTX and high-octane gasoline, and the byproduct hydrogen enters the hydrogen system through the compressor; refining straight-run kerosene in an atmospheric distillation tower, and modifying the refined straight-run kerosene with kerosene obtained in a fractionating tower to obtain aviation kerosene; straight-run naphtha of the atmospheric distillation tower, wax oil of the fractionating tower and LPG of the gas-gas separation device enter a steam cracking device together to produce olefin.

The emulsification fixed bed hydrogenation device comprises an emulsification fixed bed hydrofining reactor and an emulsification fixed bed hydrocracking reactor which are connected in series.

The oil refining process comprises the following steps:

a. crude oil enters an atmospheric distillation device, straight-run naphtha is extracted from the top of an atmospheric distillation tower, straight-run kerosene and straight-run diesel are extracted from the side line, and atmospheric residue oil is extracted from the bottom of the tower;

b. the method comprises the steps of enabling atmospheric residue, a catalyst and hydrogen from a hydrogen system to enter an emulsion bed hydrogenation reactor, and carrying out efficient hydrogenation reaction in an emulsion bed hydrogenation device under the operating conditions of pressure of 2-14 MPa, temperature of 400-470 ℃ and airspeed of 0.5-2.0 h^-1The hydrogen-oil ratio is quantitative hydrogen supply, and the product after reaction enters an online separation system and is separated into a gas-phase product and a liquid-phase product containing solid matters;

c. the liquid phase product separated on line in the step b) enters a reduced pressure distillation device for liquid-solid separation, reduced pressure distillate oil is extracted from the side line of the reduced pressure distillation tower, and tail oil containing solid matters is extracted from the bottom of the tower and is used as a gasification raw material to enter a hydrogen production device;

d. step c) vacuum distillate oil extracted from the side line of the vacuum distillation tower, straight-run diesel oil extracted from the side line of the atmospheric distillation device in the step a), gas-phase products separated on line in the step b) and hydrogen from a hydrogen system enter an emulsification fixed bed hydrogenation device, and hydrogenation reaction is carried out through an emulsification fixed bed hydrofining reactor and an emulsification fixed bed hydrocracking reactor which are connected in series in a mode of feeding in and feeding out from the bottom, wherein the operation conditions are that the pressure is 2-14 MPa, the temperature is 300-420 ℃, and the space velocity is 1.0-2.0 h^-1The hydrogen-oil ratio is quantitative hydrogen supply, and the product after reaction enters a separation system for gas-liquid separation;

e. after reaction products of the hydrogenation reaction device of the emulsification fixed bed enter a separation system, gas-liquid separation is carried out by a gas-liquid separation device, the separated gas mixture enters the gas-gas separation device to obtain unreacted hydrogen, dry gas and LPG, and the unreacted hydrogen enters a hydrogen system through a recycle hydrogen compressor; the separated liquid mixture enters a fractionating tower to obtain naphtha, kerosene, diesel oil and wax oil;

f. extracting straight-run naphtha from the top of the atmospheric distillation tower and naphtha obtained by a fractionating tower into a catalytic reforming device for processing to obtain BTX and high-octane gasoline, and feeding the byproduct hydrogen into a hydrogen system through a compressor;

g. refining straight-run kerosene in an atmospheric distillation tower, and modifying the refined straight-run kerosene with kerosene obtained in a fractionating tower to obtain aviation kerosene;

h. straight-run naphtha of the atmospheric distillation tower, wax oil of the fractionating tower and LPG of the gas-gas separation device enter a steam cracking device together to produce olefin.

The catalyst adopted by the hydrogenation device of the emulsion bed in the step b) is an iron-based or molybdenum-based catalyst, and the particle size distribution range of the catalyst is 10-300 mu m.

The sizes of the dispersed-phase hydrogen microbubbles in the emulsion bed hydrogenation device and the emulsion fixed bed hydrogenation device are 10-1000 mu m, and the gas-liquid phase interface area is 2000-20000 m²/m³。

The emulsion bed hydrogenation device can be used for processing heavy oil with high metal content, high asphaltene content, high solid content, high carbon residue content and high sulfur nitrogen content, wherein the sulfur content in the heavy oil is 0.1-8 wt%, the nitrogen content is 0.1-1.0 wt%, the solid content is 0.01-1 wt%, the metal (Fe + Ni + V) content is 10-2000 ppm, the asphaltene content is 0.1-25 wt%, and the carbon residue content is 1-40 wt%.

The total heavy oil conversion rate of the emulsion bed hydrogenation device is 85-99%, the asphaltene conversion rate is 75-95%, and the hydrogen consumption is 1-3 wt%; the total liquid yield is 85-95 wt%, the tail oil yield is 2-6 wt%, in the total liquid yield, the naphtha fraction accounts for 5-15 wt%, the diesel fraction accounts for 30-40 wt%, and the wax oil fraction accounts for 30-40 wt%; the desulfurization rate is 50-85 wt%, the denitrification rate is 30-50 wt%, and the demetallization rate is more than 90 wt%.

The total liquid yield of the hydrogenation device of the emulsification fixed bed is 95-99%, and the desulfurization rate is 90-99%.

The emulsifying fixed bed hydrogenation device is formed by grading a catalyst with one or more mixed active components of molybdenum, nickel, tungsten and cobalt, and the catalyst is filled in layers in the shape of one or more of clover, clover and dentate sphere.

The density of naphtha obtained by the fractionating tower is 0.70-0.78 kg/cm³Fangxiang Xian>40% and a kerosene density of 0.775-0.83 kg/cm³Freezing point<Diesel oil density at-46 ℃ of 0.80-0.845 kg/cm³Cetane number of>51, the BMCI value of the wax oil is 6-18.

And returning the wax oil obtained by the fractionating tower to the emulsification fixed bed hydrogenation device and entering the emulsification fixed bed hydrocracking reactor.

Through the synergistic enhancement of the micro-interface chemical reaction and the transfer process of the mesoscale, the invention has the characteristics of wide raw material application, short process flow, high liquid yield, high energy conversion efficiency, low production cost, cleanness and environmental protection. The fuel-chemical oil refinery does not need to build processing devices such as catalytic cracking, hydrocracking, delayed coking, heavy oil hydrogenation pretreatment and the like, the ethylene raw material is more abundant and flexible in supply, and the production regulation and control of the oil product/chemical product proportion can be carried out according to market demands.

Drawings

FIG. 1 is a production process diagram of the present invention.

Detailed Description

The invention is described in further detail below with reference to fig. 1:

referring to fig. 1, the system of the present invention includes an atmospheric distillation unit with a crude oil inlet, hydrogen from atmospheric residue, catalyst and hydrogen system at the lower end of the atmospheric distillation unit is connected with the inlet of an emulsion bed hydrogenation reaction unit through a pipeline, the product after the reaction of the emulsion bed hydrogenation reaction unit enters an on-line separation system, the liquid phase product separated by the on-line separation system enters a vacuum distillation unit for liquid-solid separation, the tail oil containing solid matter extracted from the bottom of the vacuum distillation unit enters a hydrogen production unit, the vacuum distillate oil extracted from the side line of the vacuum distillation tower and the straight-run diesel oil extracted from the side line of the atmospheric distillation unit, the gas phase product separated by the on-line separation system and the hydrogen from the hydrogen system enter the emulsion fixed bed hydrogenation unit together, the emulsion fixed bed hydrogenation unit includes an emulsion fixed bed hydrofining reactor and an emulsion fixed bed hydrocracking reactor connected, the product reacted by the emulsifying fixed bed hydrogenation device enters a gas-liquid separator of a separation system for gas-liquid separation, the separated gas mixture enters a gas-gas separation device to obtain dry gas, LPG and unreacted hydrogen entering a hydrogen system through a recycle hydrogen compressor, the separated liquid mixture enters a fractionating tower to obtain naphtha, kerosene, diesel oil and wax oil, the top of a normal pressure distillation tower extracts straight-run naphtha and the naphtha obtained by the fractionating tower and enters a catalytic reforming device together to obtain BTX and high octane gasoline, and the byproduct hydrogen enters the hydrogen system through the compressor; refining straight-run kerosene in an atmospheric distillation tower, and modifying the refined straight-run kerosene with kerosene obtained in a fractionating tower to obtain aviation kerosene; straight-run naphtha of the atmospheric distillation tower, wax oil of the fractionating tower and LPG of the gas-gas separation device enter a steam cracking device together to produce olefin.

Referring to fig. 1, the process of the present invention comprises the following steps:

a. crude oil enters an atmospheric distillation device, straight-run naphtha is extracted from the top of an atmospheric distillation tower, straight-run kerosene and straight-run diesel are extracted from the side line, and atmospheric residue oil is extracted from the bottom of the tower;

b. the method comprises the steps of enabling atmospheric residue, a catalyst and hydrogen from a hydrogen system to enter an emulsion bed hydrogenation reactor, and carrying out efficient hydrogenation reaction in an emulsion bed hydrogenation device under the operating conditions of pressure of 2-14 MPa, temperature of 400-470 ℃ and airspeed of 0.5-2.0 h^-1The hydrogen-oil ratio is quantitative hydrogen supply, and the product after reaction enters an online separation system and is separated into a gas-phase product and a liquid-phase product containing solid matters;

wherein the catalyst is iron-based or molybdenum-based catalyst, and the particle size distribution range of the catalyst is 10-300 μm;

c. the liquid phase product separated on line in the step b) enters a reduced pressure distillation device for liquid-solid separation, reduced pressure distillate oil is extracted from the side line of the reduced pressure distillation tower, and tail oil containing solid matters is extracted from the bottom of the tower and is used as a gasification raw material to enter a hydrogen production device;

d. step c) vacuum distillate oil extracted from the side line of the vacuum distillation tower, straight-run diesel oil extracted from the side line of the atmospheric distillation device in the step a), gas-phase products separated on line in the step b) and hydrogen from a hydrogen system enter an emulsification fixed bed hydrogenation device, and hydrogenation reaction is carried out through an emulsification fixed bed hydrofining reactor and an emulsification fixed bed hydrocracking reactor which are connected in series in a mode of feeding in and feeding out from the bottom, wherein the operation conditions are that the pressure is 2-14 MPa, the temperature is 300-420 ℃, and the space velocity is 1.0-2.0 h^-1The hydrogen-oil ratio is quantitative hydrogen supply, and the product after reaction enters a separation system for gas-liquid separation;

e. after reaction products of the hydrogenation reaction device of the emulsification fixed bed enter a separation system, gas-liquid separation is carried out by a gas-liquid separation device, the separated gas mixture enters the gas-gas separation device to obtain unreacted hydrogen, dry gas and LPG, and the unreacted hydrogen enters a hydrogen system through a recycle hydrogen compressor; the separated liquid mixture enters a fractionating tower to obtain naphtha, kerosene, diesel oil and wax oil;

f. extracting straight-run naphtha from the top of the atmospheric distillation tower and naphtha obtained by a fractionating tower into a catalytic reforming device for processing to obtain BTX and high-octane gasoline, and feeding the byproduct hydrogen into a hydrogen system through a compressor;

g. refining straight-run kerosene in an atmospheric distillation tower, and modifying the refined straight-run kerosene with kerosene obtained in a fractionating tower to obtain aviation kerosene;

h. straight-run naphtha of the atmospheric distillation tower, wax oil of the fractionating tower and LPG of the gas-gas separation device enter a steam cracking device together to produce olefin.

The sizes of hydrogen microbubbles of dispersed phases in the emulsifying bed hydrogenation device and the emulsifying fixed bed hydrogenation device are 10-1000 mu m, and the gas-liquid phase interface area is 2000-20000 m²/m³. The diffusion resistance of a liquid film in the constructed mesoscopic reaction system is greatly reduced, the phase interface is greatly improved, the hydrogen dissolving and transferring capability is enhanced, and the hydrogenation reaction efficiency is obviously improved.

The emulsifying bed hydrogenation device has strong adaptability to raw materials, and can process heavy oil with high metal content, high asphaltene content, high solid content, high carbon residue and high sulfur nitrogen content, wherein the sulfur content in the raw materials is 0.1-8 wt%, the nitrogen content is 0.1-1.0 wt%, the solid content is 0.01-1 wt%, the metal (Fe + Ni + V) content is 1-2000 ppm, the asphaltene content is 0.1-25 wt%, the carbon residue content is 1-40 wt%, and the single set processing capacity is 500 ten thousand tons/year. The total conversion rate of heavy oil is 85-99%, the conversion rate of asphaltene is 75-95%, and the hydrogen consumption is 1-3 wt%.

The total liquid yield of the emulsion bed hydrogenation device is 85-95 wt%, the yield of tail oil is 2-6 wt%, and in the total liquid yield, the naphtha fraction accounts for 5-15 wt%, the diesel fraction accounts for 30-40 wt%, and the wax oil fraction accounts for 30-40 wt%.

The desulfurization rate of the emulsion bed hydrogenation device is 50-85 wt%, the denitrification rate is 30-50 wt%, and the demetallization rate is more than 90 wt%.

The total liquid yield of the hydrogenation device of the emulsification fixed bed is 95-99 percent, and the desulfurization rate is 90-99 percent.

The hydrogenation device of the emulsification fixed bed is formed by grading a catalyst with one or more mixed active components of molybdenum, nickel, tungsten and cobalt, and the catalyst is filled in layers with one or more of clover, clover and dentate sphere.

The density of naphtha obtained by the fractionating tower is 0.70-0.78 kg/cm³Fangxiang Xian>40% and a kerosene density of 0.775-0.83 kg/cm³Freezing point<Diesel oil density of 0.80-0.845 kg at-46 DEG Ccm³Cetane number of>51, the BMCI value of the wax oil is 6-18.

Returning the wax oil obtained from the fractionating tower to the emulsification fixed bed hydrogenation device and entering the emulsification fixed bed hydrocracking reactor.

The wax oil obtained by the invention can be returned to an emulsification fixed bed hydrogenation device for further conversion to produce naphtha and diesel oil, and can also enter a steam cracking device for producing olefin, and the adjustment ratio is 0-1 according to market demands;

the obtained straight-run naphtha can enter a steam cracking device to produce olefin, and also can enter a catalytic reforming device to produce high-octane gasoline and BTX, and the adjustment is carried out according to market demands, and the adjustment proportion is 1-0.

The emulsion bed hydrogenation device, the online separation system and the emulsion fixed bed hydrogenation device are in the same system and are an online integrated process.

The hydrogen production device can be coupled with a fuel gas-steam combined cycle power generation system and a C1 chemical device.

The invention has the following beneficial effects:

1. the invention introduces the micro-interface chemical reaction with mesoscopic scale and the synergistic enhancement of the transfer process, greatly reduces the diffusion resistance of a liquid film in the constructed mesoscopic reaction system, greatly increases the phase interface, enhances the hydrogen dissolving and transferring capability, and obviously improves the hydrogenation reaction efficiency.

2. The emulsion bed hydrogenation technology of the invention can replace four technologies of heavy oil pre-hydrogenation (RDS), hydrocracking, catalytic cracking and delayed coking, and realize one-step efficient clean conversion of heavy distillate oil in crude oil; but also can process heavy oil with high metal content, high asphaltene content, high carbon residue content and high solid content, and better solves the problems of heavy oil and light oil of the world.

3. Compared with the existing fixed bed hydrogenation technology, the emulsification fixed bed hydrogenation technology of the invention not only can improve the processing capacity, but also can increase the hydrogenation reaction effect and reduce the operation severity and energy consumption.

4. According to the invention, the future fuel-chemical refinery only comprises main processing devices such as an atmospheric distillation device, a vacuum distillation device, an emulsion bed hydrogenation device, a fixed bed emulsion hydrogenation device, a catalytic reforming device, a steam cracking device and the like, compared with the current existing fuel-chemical refinery, on one hand, a catalytic cracking device, a hydrocracking device, a heavy oil hydrogenation pretreatment device and a coking device are not needed, and the number of the main processing devices is reduced by 2-3 sets; on the other hand, the raw materials for steam cracking are flexibly supplied by straight-run naphtha, hydrogenated wax oil and LPG (light hydrocarbon) according to production needs, so that the olefin productivity can be improved, the production proportion of oil products/chemical products can be well regulated and controlled, and the steam cracking method has strong market competitiveness.