Delayed coking raw material feeding device

Abstract

The utility model relates to the technical field of delayed coking, in particular to a delayed coking raw material feeding device which comprises a crude oil feeding pipe, a first-stage demulsifier feeding pipe and a second-stage demulsifier feeding pipe, the crude oil feeding pipe is connected with the input end of a first-stage desalting feeding pipe, and the output end of the first-stage desalting feeding pipe is connected with a feeding port of a first-stage electric desalting tank. An oil phase discharge port of the first-stage electric desalting tank is connected with a feed port of the second-stage electric desalting tank through a first-stage oil phase discharge pipe, and an oil phase discharge port of the second-stage electric desalting tank is connected with a feed header pipe through a second-stage oil phase discharge pipe; the output end of the first-stage demulsifier supply pipe is connected with a crude oil supply pipe, and the output end of the second-stage demulsifier supply pipe is connected with a first-stage oil phase discharge pipe. The electro-desalting pretreatment device can be used for electro-desalting pretreatment of blended high-density and high-salt-content crude oil raw materials, so that the quality of delayed coking products is improved, and the diversity of the raw materials is increased.

Description

Technical Field

[0001] This utility model relates to the field of delayed coking technology, specifically to a delayed coking raw material feeding device. Background Technology

[0002] Delayed coking is a thermal cracking process. Its main purpose is to convert high-carbon residual oil into light oil. The equipment used can be recycled, meaning that the heavier fractions from the coking distillate of heavy oil are used as recycled oil and have a longer residence time in the unit.

[0003] The feedstock for delayed coking units is generally vacuum residue and catalytic slurry. Feedstock is supplied through tank farms or direct supply from the unit, resulting in a relatively singular source. If the primary and secondary processing units are not well-matched, external sourcing of vacuum residue is necessary to compensate for the shortfall in feedstock processing of inferior oil. However, the profit margin for externally sourced vacuum residue fluctuates significantly with market changes, making it difficult to guarantee the company's profitability. Furthermore, the complex and variable properties of externally sourced vacuum residue increase the probability of accidents such as coking in furnace tubes, uneven coking in the coke tower, and wear and leakage in high-temperature components. Simultaneously, to meet the feedstock supply needs of secondary processing units such as delayed coking and to address the overall plant material balance, the production plan of the atmospheric and vacuum distillation unit will be limited, significantly reducing profits. Therefore, expanding the feedstock sources for delayed coking units and increasing the diversity of feedstocks for secondary processing units will greatly improve the adaptability of the overall plant processing plan and enhance the company's economic efficiency.

[0004] Based on a comparison of the properties of high-density, high-salt crude oil and vacuum residue, blending can be used as feedstock for delayed coking units. However, the high salt content of this feedstock affects product quality, and existing delayed coking units cannot process it directly, requiring process modifications to the unit. Utility Model Content

[0005] To address the technical problem that the high salt content of high-density, high-salt crude oil affects product quality when used as a feedstock for delayed coking, this invention provides a feedstock feeding device for delayed coking. This device can perform electro-desalting pretreatment on the high-density, high-salt crude oil feedstock, thereby improving the quality of delayed coking products and increasing the diversity of feedstocks.

[0006] This utility model is achieved through the following technical solution:

[0007] A delayed coking feedstock feeding device includes a cold residue oil feed pipe and a hot residue oil feed pipe. The output ends of the cold residue oil feed pipe and the hot residue oil feed pipe are connected to the inlet of the feedstock oil buffer tank through a feed manifold. The device is characterized by further including a crude oil feed pipe, a primary demulsifier feed pipe, and a secondary demulsifier feed pipe. The crude oil feed pipe is connected to the input end of the primary desalting feed pipe. The output end of the primary desalting feed pipe is connected to the inlet of the primary electric desalting tank. The oil phase outlet of the primary electric desalting tank is connected to the inlet of the secondary electric desalting tank through a primary oil phase outlet pipe. The oil phase outlet of the secondary electric desalting tank is connected to the feed manifold through a secondary oil phase outlet pipe. The output end of the primary demulsifier feed pipe is connected to the crude oil feed pipe, and the output end of the secondary demulsifier feed pipe is connected to the primary oil phase outlet pipe.

[0008] Furthermore, the crude oil feed pipe is equipped with a heat exchanger assembly and a first mixer. The heat exchanger assembly includes a first heat exchanger and a second heat exchanger. The first mixer is located between the connection point of the primary demulsifier feed pipe, the primary desalting feed pipe, and the crude oil feed pipe. The function of the heat exchanger assembly is to preheat the high-density, high-salt crude oil feedstock before proceeding to the next process. The heat sources for the first and second heat exchangers are the top circulation oil and diesel oil from the heavy oil catalytic cracking unit, respectively.

[0009] Furthermore, the aqueous phase outlet of the primary electric desalting tank is connected to the hot inlet of the third heat exchanger via the primary aqueous phase outlet pipe. The hot outlet of the third heat exchanger is connected to the drain pipe. The cold inlet of the third heat exchanger is connected to the purified water storage tank via the purified water inlet pipe. The cold outlet of the third heat exchanger is connected to the primary oil phase outlet pipe via the primary water supply pipe. The purpose is to reuse the waste heat from the aqueous phase discharge of the primary electric desalting tank, fully utilize the low-temperature waste heat, and improve energy efficiency.

[0010] Furthermore, the aqueous phase outlet of the secondary electrostatic desalting tank is connected to the crude oil supply pipe via a second water supply pipeline. This allows the effluent from the secondary electrostatic desalting tank to be returned and mixed with the crude oil supply pipe before being reused in the primary electrostatic desalting tank.

[0011] Furthermore, a first water pump is installed on the purified water inlet pipe, and a second water pump is installed on the second water supply pipe. Their function is to provide power for the water flow.

[0012] Furthermore, a second mixer is installed on the primary oil phase discharge pipe, located between the connection point of the primary water supply pipe, the secondary electrostatic desalination tank, and the primary oil phase discharge pipe. Its function is to provide mixing.

[0013] Furthermore, a fourth heat exchanger is installed on the cold residue oil feed pipe, and a fifth heat exchanger is installed on the main feed pipe. Their function is to heat the cold residue oil feed and the mixture, respectively.

[0014] The beneficial effects of this utility model are as follows:

[0015] (1) This utility model can perform desalting pretreatment on high-density, high-salt crude oil raw materials blended during delayed coking. The crude oil after desalting treatment is directly fed into the delayed coking unit for processing, which shortens the processing process, reduces the overall energy consumption of crude oil processing, improves product quality, and increases economic benefits.

[0016] (2) This utility model can realize the use of high-density, high-salt crude oil as a raw material for delayed coking, basically eliminating the need for externally sourced residue oil and making up for the raw material processing gap of delayed coking unit. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model.

[0019] In the diagram, 1-First heat exchanger, 2-Second heat exchanger, 3-First mixer, 4-Purified water storage tank, 5-First-stage electric desalting tank, 6-Third heat exchanger, 7-Cooler, 8-First water pump, 9-Second mixer, 10-Second-stage electric desalting tank, 11-Second water pump, 12-Fourth heat exchanger, 13-Fifth heat exchanger, 14-French oil buffer tank, 15-Feed main pipe, 16-Cold residue oil feed pipe, 1 7-Hot residual oil feed pipe, 18-Crude oil feed pipe, 19-Primary demulsifier feed pipe, 20-Secondary demulsifier feed pipe, 21-Purified water feed pipe, 22-Secondary water supply pipe, 23-Primary desalination feed pipe, 24-Primary oil phase discharge pipe, 25-First water supply pipe, 26-Primary aqueous phase discharge pipe, 27-Sewage pipe, 28-Secondary oil phase discharge pipe, 29-Oil pump, 30-Main feed pipe. Detailed Implementation

[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] Example 1

[0022] Combination Figure 1This utility model provides a delayed coking feedstock feeding device, including a cold residue oil feed pipe 16 and a hot residue oil feed pipe 17. The output ends of the cold residue oil feed pipe 16 and the hot residue oil feed pipe 17 are connected to the inlet of the feedstock oil buffer tank 14 through a feed manifold 15. It also includes a crude oil feed pipe 18, a primary demulsifier feed pipe 19, and a secondary demulsifier feed pipe 20. The crude oil feed pipe 18 is connected to the input end of the primary desalting feed pipe 23, and the output end of the primary desalting feed pipe 23 is connected to the inlet of the primary electric desalting tank 5. The oil phase outlet of desalting tank 5 is connected to the inlet of secondary electric desalting tank 10 through primary oil phase outlet pipe 24. The oil phase outlet of secondary electric desalting tank 10 is connected to feed main pipe 15 through secondary oil phase outlet pipe 28. The water phase outlet of secondary electric desalting tank 10 is connected to crude oil supply pipe 18 through second water supply pipe 22. Second water pump 11 is installed on second water supply pipe 22. The output end of primary demulsifier supply pipe 19 is connected to crude oil supply pipe 18, and the output end of secondary demulsifier supply pipe 20 is connected to primary oil phase outlet pipe 24.

[0023] This utility model provides a heat exchanger group and a first mixer 3 on the crude oil supply pipe 18. The heat exchanger group includes a first heat exchanger 1 and a second heat exchanger 2. The function of the heat exchanger group is to preheat the incoming high-density, high-salt crude oil through heat exchange. The first mixer 3 is located between the connection between the primary demulsifier supply pipe 19, the primary desalting feed pipe 23 and the crude oil supply pipe 18. The function of the first mixer 3 is to introduce demulsifier into the crude oil supply pipe 18 through the primary demulsifier supply pipe 19, and mix it with the crude oil in the first mixer 3 before entering the primary electric desalting tank 5.

[0024] The aqueous phase outlet of the primary electrostatic desalination tank 5 of this invention is connected to the heat inlet of the third heat exchanger 6 via a primary aqueous phase outlet pipe 26. The heat outlet of the third heat exchanger 6 is connected to a drain pipe 27, on which a cooling device 7 is installed. The cold inlet of the third heat exchanger 6 is connected to a purified water storage tank 4 via a purified water inlet pipe 21, on which a first water pump 8 is installed. The cold outlet of the third heat exchanger 6 is connected to a primary oil phase outlet pipe 24 via a first water supply pipe 25. The aqueous phase outlet of the primary electrostatic desalination tank 5 carries residual heat, which can be used as a heat source to exchange heat with the purified water, preheating the purified water before it enters the secondary electrostatic desalination tank 10, thus improving energy utilization.

[0025] This utility model has a fourth heat exchanger 12 on the cold residue oil feed pipe 16 and a fifth heat exchanger 13 on the feed main pipe 15, which are used for preheating and heating the residue oil.

[0026] This utility model has a second mixer 9 on the primary oil phase discharge pipe 24. The second mixer 9 is located between the connection between the first water supply pipe 25, the secondary electrostatic desalting tank 10 and the primary oil phase discharge pipe 24. It can mix the oil phase discharge from the primary electrostatic desalting tank 5, the demulsifier and the purified water and then enter the secondary electrostatic desalting tank 10 for use.

[0027] The workflow and principle of this utility model are as follows:

[0028] High-density, high-salt crude oil is fed from the tank farm into the first heat exchanger 1 (heat source top circulation oil) for heating, raising the temperature to 65°C. After being output, it enters the second heat exchanger 2 (heat source diesel), where it is heated to 135°C, meeting the conditions for electro-desalting. It is then output to the first mixer 3, where it is thoroughly mixed with oil-soluble demulsifier supplied by the first-stage demulsifier supply pipe 19. The first mixer 3 has an oil input end, an oil output end, and a demulsifier input end. The mixed material is then combined with water supplied by the second water supply pipe 22 and enters the first-stage electro-desalting tank 5. Inside the electro-desalting tank, under the influence of a strong electric field and the demulsifier, desalting and dehydration are completed. The oil phase is output at the oil phase output end, and the aqueous phase containing salt is output at the aqueous phase output end.

[0029] The purified water stored in the purified water storage tank 4 enters the third heat exchanger 6 and exchanges heat with the water phase output from the first-stage electric desalting tank 5. It is heated to 110°C in the heat exchanger and then combined with the oil phase output from the second-stage demulsifier supply pipe 20 and the first-stage electric desalting tank 5. After being mixed by the second mixer 9, it enters the second-stage electric desalting tank 10 for electric desalting treatment. The desalted oil phase is combined with the hot and cold residue oil in the feed main pipe 15 and stored in the feed oil buffer tank 14. When in use, it is discharged through the feed main pipe 30 under the action of the oil pump 29 and fed to the delayed coking unit.

[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A delayed coking feedstock feeding device, comprising a cold residue oil feed pipe and a hot residue oil feed pipe, the output ends of the cold residue oil feed pipe and the hot residue oil feed pipe being connected to the inlet of a feedstock oil buffer tank via a main feed pipe, characterized in that, It also includes a crude oil supply pipe, a primary demulsifier supply pipe, and a secondary demulsifier supply pipe. The crude oil supply pipe is connected to the input end of the primary desalting feed pipe, and the output end of the primary desalting feed pipe is connected to the inlet of the primary electric desalting tank. The oil phase outlet of the primary electric desalting tank is connected to the inlet of the secondary electric desalting tank through the primary oil phase outlet pipe, and the oil phase outlet of the secondary electric desalting tank is connected to the feed main pipe through the secondary oil phase outlet pipe. The output end of the primary demulsifier supply pipe is connected to the crude oil supply pipe, and the output end of the secondary demulsifier supply pipe is connected to the primary oil phase outlet pipe.

2. The delayed coking feedstock feeding device as described in claim 1, characterized in that, The crude oil feed pipe is equipped with a heat exchanger group and a first mixer. The heat exchanger group includes a first heat exchanger and a second heat exchanger. The first mixer is located between the connection point of the primary demulsifier feed pipe, the primary desalting feed pipe and the crude oil feed pipe.

3. The delayed coking feedstock feeding device as described in claim 1, characterized in that, The aqueous phase outlet of the primary desalination tank is connected to the hot inlet of the third heat exchanger via the primary aqueous phase outlet pipe. The hot outlet of the third heat exchanger is connected to the drain pipe. The cold inlet of the third heat exchanger is connected to the purified water storage tank via the purified water inlet pipe. The cold outlet of the third heat exchanger is connected to the primary oil phase outlet pipe via the primary water supply pipe.

4. The delayed coking feedstock feeding device as described in claim 3, characterized in that, The aqueous phase outlet of the secondary electric desalting tank is connected to the crude oil supply pipe via a second water supply pipeline.

5. The delayed coking feedstock feeding device as described in claim 4, characterized in that, A first water pump is installed on the purified water inlet pipe, and a second water pump is installed on the second water supply pipe.

6. The delayed coking feedstock feeding device as described in claim 4, characterized in that, A second mixer is installed on the primary oil phase discharge pipe. The second mixer is located between the connection point of the primary water supply pipe, the secondary electric desalting tank and the primary oil phase discharge pipe.

7. The delayed coking feedstock feeding device as described in claim 1, characterized in that, A fourth heat exchanger is installed on the cold residue oil feed pipe, and a fifth heat exchanger is installed on the feed main pipe.

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