Delayed coking scum recycling device

Abstract

The utility model relates to the technical field of delayed coking, in particular to a delayed coking scum recycling device, which comprises two parallel coke towers, a scum tank, a scum pump and an atomizer, a feed pipe is connected between feed ports at the bottoms of the two coke towers, and the feed pipe is provided with a coking oil delivery pipe communicated with the feed pipe in a T-shaped manner. A bottom discharge port of the scum tank is connected with a feed port of the scum pump through a pipeline, a discharge port of the scum pump is connected with a liquid phase inlet of the atomizer through a first pipeline, a gas phase inlet of the atomizer is connected with a low-pressure steam pipe network through a second pipeline, and a discharge port of the atomizer is communicated with the feed pipe through a third pipeline. According to the utility model, the accident risk rate of tower blockage can be reduced, and the technical problem of overlarge tower vibration in coking engineering is solved. Meanwhile, the reaction of the scum in the coke tower is more thorough, and most of light oil components in the scum can be recovered, so that the quality of a coke product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of delayed coking, in particular to a delayed coking slag recycling device. Background Art

[0002] Recycling scum from the delayed coking unit is a common environmental protection and resource utilization measure in refineries. Scum is primarily produced during the refinery's wastewater treatment process, particularly in the flotation unit. It is primarily composed of oil, water, suspended solids, and other impurities, with a moisture content generally exceeding 90%. Because scum contains a certain amount of recoverable hydrocarbons and other valuable components, it is also classified as hazardous waste. Therefore, direct discharge or simple disposal not only wastes resources but also may cause environmental pollution. Recycling scum can recover hydrocarbons and other valuable substances, improve resource utilization, reduce scum discharge and accumulation, and mitigate potential environmental threats.

[0003] The slag recycling method includes: after the large steam blowing of the coke tower is completed, in the small water supply stage, the slag in the buffer tank is pressurized by the slag pump and then introduced into the coke tower for recycling. The oil and organic matter in the slag will be broken down into smaller molecules, part of which will be recovered as products and part as part of the coke.

[0004] Because recycling slag during high steam blowing can cause water hammer and coke explosion, most refineries recycle slag during the low-water feed phase of the coke drum. Since slag enters the coke drum during this phase, the coke temperature is relatively low, and the slag enters along with the feed water, the oily floating matter in the slag cannot be effectively recycled. Some of this oil adheres to the coke surface or in the green coke channel, affecting coke quality data. Others circulate repeatedly with the cold coke water, causing the water quality to deteriorate to a low level, further affecting coke quality indicators. Utility Model Content

[0005] Aiming at the technical problem in the prior art that slag recycling affects the quality of coke, the utility model provides a delayed coking slag recycling device to improve the quality of coke products.

[0006] The technical solution of this utility model is as follows:

[0007] A delayed coking slag recycling device comprises two coke drums arranged in parallel. A feed pipe is connected between the bottom feed openings of the two coke drums. The feed pipe is equipped with a coking oil delivery pipe connected to the feed opening in a T-shaped manner. The device also includes a slag tank, a slag pump, and an atomizer. The bottom discharge opening of the slag tank is connected to the feed opening of the slag pump via a pipeline. The discharge opening of the slag pump is connected to the liquid phase inlet of the atomizer via a first pipeline. The gas phase inlet of the atomizer is connected to a low-pressure steam network via a second pipeline. The discharge opening of the atomizer is connected to the feed pipe via a third pipeline. A light fraction discharge pipe is provided at the top outlet of each coke drum. A vent pipe is connected between the two light fraction discharge pipes, and the vent pipe is equipped with a vent valve. This vent pipe functions to vent the interior of the coke drum. A first temperature sensor is mounted on the inner wall of the light fraction discharge pipe, located near the top outlet of the coke drum and electrically connected to a controller. This sensor provides feedback on the temperature of the medium at the top of the coke drum, thereby controlling the steam and slag flow rates. A second temperature sensor is installed on the coke drum wall, located in the upper-middle portion of the drum. It is electrically connected to the controller. It monitors and provides feedback on the drum wall temperature, thereby controlling the steam and slag flow rates. A first flowmeter and a first regulating valve are installed on the first pipeline, both of which are electrically connected to the controller. These two valves are used to monitor and regulate the slag flow rate. A second flowmeter and a second regulating valve are installed on the second pipeline, both of which are electrically connected to the controller. These two valves are used to monitor and regulate the steam flow rate.

[0008] Furthermore, the system further comprises a first cross-line, wherein the input end and the output end of the first cross-line are respectively connected to the first pipelines on both sides of the first regulating valve, and a first valve is provided on the first cross-line to enable manual adjustment of the slag flow rate.

[0009] Furthermore, the system further comprises a second cross-line, the input end and the output end of the second cross-line being respectively connected to the second pipelines on both sides of the second regulating valve, and a second valve being provided on the second cross-line to enable manual adjustment of the steam flow.

[0010] Furthermore, the first pipeline is connected to a fourth pipeline in a T-shaped manner, and the end of the fourth pipeline is connected to the cold coke pool. The purpose of the fourth pipeline is to set up a branch pipeline to the cold coke pool to blow the accumulated water in the pipeline into the cold coke pool.

[0011] Furthermore, the feed pipe is connected to the coking oil delivery pipe in a T-shape through a three-way valve.

[0012] Furthermore, the vent valve is electrically connected to the controller.

[0013] The beneficial effects of this utility model are as follows: it uses an atomizer to atomize slag into tiny droplets, which are carried by high-speed steam and enter the coke drum through a pipeline. The atomized droplets are pre-expanded upon entering the coke drum, preventing rapid expansion that could cause coke explosion. This reduces the risk of tower blockage accidents and solves the technical problem of excessive tower vibration in coking operations. Furthermore, after atomization, the slag does not accumulate in the coke drum cone, but instead rises rapidly along the channels, absorbing the heat from the coke and rapidly vaporizing. The slag reacts more thoroughly within the coke drum, allowing the vast majority of the light oil components in the slag to be recovered, thereby improving the quality of the coke product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 This is a structural diagram of Example 1 of the specific implementation method of the present utility model.

[0016] In the figure, 1-scum tank, 2-scum pump, 3-first flow meter, 4-first valve, 5-first cross line, 6-first regulating valve, 7-first pipeline, 8-second pipeline, 9-second flow meter, 10-second valve, 11-second cross line, 12-second regulating valve, 13-atomizer, 14-fourth pipeline, 15-cold coke pool, 16-coking oil feed pipe, 17-feed pipe, 18-vent pipe, 19-vent valve, 20-coke tower, 21-light component discharge pipe, 22-controller, 23-third pipeline. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0018] Example 1

[0019] Combine Figure 1The present invention provides a delayed coking slag recycling device comprising two coke drums 20 arranged in parallel. A feed pipe 17 is connected between the bottom feed ports of the two coke drums 20. The feed pipe 17 is connected to a coking oil delivery pipe 16 in a T-shaped manner via a three-way valve. The feed end of the coking oil delivery pipe 16 is connected to the heating oil of the heating furnace. A light component discharge pipe 21 is provided at the top outlet of each coke drum 20. A vent pipe 18 is connected between the two light component discharge pipes 21. The vent pipe 18 is equipped with a vent valve 19. The design processing scale of the delayed coking device of the present invention is 100×10 4 t / a, the diameter of coke tower 20 is 8.4m, it adopts one furnace and two towers structure, and the coking cycle is 24h.

[0020] The device of the present utility model also includes a scum tank 1, a scum pump 2, and an atomizer 13. The discharge port at the bottom of the scum tank 1 is connected to the feed port of the scum pump 2 through a pipeline. The discharge port of the scum pump 2 is connected to the liquid phase inlet of the atomizer 13 through a first pipeline 7. The gas phase inlet of the atomizer 13 is connected to the low-pressure steam network through a second pipeline 8. The discharge port of the atomizer 13 is connected to the feed pipe 17 through a third pipeline 23.

[0021] In order to achieve the automated operation of the present invention and to ensure the long-term stable operation of the coking unit while refining the slag, the present invention installs a first temperature sensor on the inner wall of the light component discharge pipe 21. The first temperature sensor is located near the top outlet of the coke drum 20 and is electrically connected to the controller 22. The first temperature sensor detects and provides feedback on the temperature of the medium at the top of the coke drum 20, thereby controlling the steam and slag flow rates. A second temperature sensor is installed on the wall of the coke drum 20. The second temperature sensor is located in the upper middle part of the coke drum 20 and is electrically connected to the controller 22. The second temperature sensor detects and provides feedback on the wall temperature of the coke drum 20, thereby controlling the steam and slag flow rates. The first pipeline 7 is provided with a first flowmeter 3 and a first regulating valve 6. The first flowmeter 3 and the first regulating valve 6 are both electrically connected to the controller 22. The second pipeline 8 is provided with a second flowmeter 9 and a second regulating valve 12. The second flowmeter 9 and the second regulating valve 12 are both electrically connected to the controller 22. It is used to automatically control the flow of steam and slag. When the temperature of the medium at the top of the tower is lower than the set value and the pressure is higher than the set value, the first regulating valve 6 is closed to stop the slag recycling.

[0022] The present invention further includes a first crossover line 510 and a second crossover line 11. The input and output ends of the first crossover line 5 are respectively connected to the first pipeline 7 on both sides of the first regulating valve 6. The first crossover line 5 is provided with a first valve 4. The input and output ends of the second crossover line 11 are respectively connected to the second pipeline 8 on both sides of the second regulating valve 12. The second crossover line 11 is provided with a second valve 10.

[0023] In this embodiment, the first pipeline 7 is connected to a fourth pipeline 14 in a T-shaped fashion. The end of the fourth pipeline 14 is connected to a cold coke pool 15, which stores the accumulated water purged from the pipeline. The vent valve 19 is a solenoid valve electrically connected to a controller 22, which controls its opening and closing.

[0024] The workflow of this utility model is:

[0025] (1) The scum produced in the sewage workshop is transported to the scum tank 1 through a pipeline. After the large steam blowing of the coke drum 20 is completed, a small water supply stage is carried out. The scum is pressurized by the scum pump 2 and enters the liquid phase inlet of the atomizer 13 after passing through the first flow meter 3 and the first regulating valve 6. In order to prevent the pipeline from freezing in winter, steam is introduced at the outlet of the pump. A branch pipeline is set near the inlet of the atomizer 13 to the cold coke pool 15, so that the accumulated water in the pipeline can be blown into the cold coke pool 15.

[0026] (2) Steam is drawn out from the low-pressure steam network and enters the gas phase inlet of the atomizer 13 through the second flowmeter 9 and the second regulating valve 12. After entering the atomizer 13, the steam atomizes the water and scum into tiny droplets. The vapor-liquid mixture enters the coke drum 20 through the outlet valve from the atomizer 13 outlet. The atomized scum is rapidly heated and vaporized in the coke drum 20, and then enters the venting system from the top of the coke drum 20 together with the steam and oil and gas. The controller 22 system controls the first regulating valve 6 and the second regulating valve 12 to adjust the scum and steam flow rates respectively according to the medium temperature feedback from the temperature sensor on the top of the coke drum 20 and the temperature drop rate feedback from the temperature sensor on the wall of the coke drum 20.

[0027] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall fall within the scope of the present invention. Any changes or substitutions that can be easily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A delayed coking slag recycling device, comprising two coke drums arranged in parallel, a feed pipe connected between the feed ports at the bottom of the two coke drums, and a coking oil delivery pipe connected to the feed pipe in a T-shaped manner, characterized in that: It also includes a scum tank, a scum pump, and an atomizer. The bottom discharge port of the scum tank is connected to the feed port of the scum pump through a pipeline. The discharge port of the scum pump is connected to the liquid phase inlet of the atomizer through a first pipeline. The gas phase inlet of the atomizer is connected to the low-pressure steam network through a second pipeline. The discharge port of the atomizer is connected to the feed pipe through a third pipeline. A light component discharge pipe is provided at the top outlet of each coke tower. A vent pipe is connected between the two light component discharge pipes. A vent valve is provided on the vent pipe. A first temperature sensor is installed on the inner wall of the light component discharge pipe. The first temperature sensor is close to the top outlet of the coke tower and is electrically connected to a controller; a second temperature sensor is installed on the wall of the coke tower, the second temperature sensor is located in the middle and upper part of the coke tower, and is electrically connected to the controller; a first flowmeter and a first regulating valve are provided on the first pipeline, and the first flowmeter and the first regulating valve are both electrically connected to the controller. A second flowmeter and a second regulating valve are provided on the second pipeline, and the second flowmeter and the second regulating valve are both electrically connected to the controller.

2. The delayed coking slag recycling device according to claim 1, characterized in that: The first cross-line is also included. The input end and the output end of the first cross-line are respectively connected to the first pipelines on both sides of the first regulating valve. The first cross-line is provided with a first valve.

3. The delayed coking slag recycling device according to claim 1, characterized in that: The second cross-line is also included. The input end and the output end of the second cross-line are respectively connected to the second pipelines on both sides of the second regulating valve. The second cross-line is provided with a second valve.

4. The delayed coking slag recycling device according to claim 1, characterized in that: The first pipeline is provided with a fourth pipeline connected thereto in a T-shape, and the end of the fourth pipeline is connected to a cold coke pool.

5. The delayed coking slag recycling device according to claim 1, characterized in that: The feed pipe is connected to the coking oil delivery pipe in T-shape through a three-way valve.

6. The delayed coking slag recycling device according to claim 1, characterized in that: The vent valve is electrically connected to the controller.

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