A system for recycling oil from an oil refinery

Abstract

This utility model provides a waste oil recycling system for an oil refining unit, including a waste oil tank, a waste oil pump, a feed tank, and a feed pump. The waste oil tank is connected to the inlet of the waste oil pump via a waste oil pump inlet pipeline, and the outlet of the waste oil pump is connected to the tank area via a waste oil pump outlet pipeline. The feed tank's first inlet is connected to the device's feed pipeline, and the feed tank's outlet is connected to the feed pump inlet via a feed pump inlet pipeline. The feed pump's outlet is connected to the reaction refining system via a feed pump outlet pipeline. The waste oil pump's outlet pipeline is connected to the recycling main pipeline, and the recycling main pipeline's outlet is connected to the feed tank's second inlet. This system enables waste oil generated by the oil refining unit to pass through the recycling pipeline, undergo a series of reaction refining / upgrading processes, and be separated and purified by a distillation system before being sent to downstream units, achieving zero waste oil discharge and producing only high-efficiency products such as finished oil products. It also allows the oil refining unit's waste oil pump to stop external discharge, achieving complete recycling, increasing effective product output, and improving unit efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of chemical technology, specifically a waste oil recycling system for oil refining units. Background Technology

[0002] Oil refining units typically have two sludge pumps. The standard equipment selection includes self-priming pumps or centrifugal pumps. The inlet pipeline of the sludge pump connects to a sludge tank. The sludge tank receives sludge from unit sampling discharge, maintenance and replacement discharge from static and dynamic equipment, and liquid discharge from various reflux tanks and separators. The pump outlet pipeline connects to the external pipeline network for sludge delivery. Because external delivery of sludge increases the unit's ineffective products, reduces production efficiency, and increases processing losses, based on general design principles for oil refining units, the processing loss is approximately 0.1%. Assuming a standard unit design capacity of 300 t / h, before the technical upgrade, approximately 30 tons of sludge were generated daily, all of which were delivered to the sludge tank area. Utility Model Content

[0003] In view of the above problems, the purpose of this application is to provide a waste oil recycling system for oil refining units, which enables waste oil generated by oil refining units to be sent to downstream units after passing through a series of reaction refining / upgrading and distillation systems via a technically modified main recycling pipeline and recycling branch pipelines, achieving zero waste oil discharge and producing high-efficiency products such as finished oil products; it also enables the oil refining unit's waste oil pumps to stop external discharge and achieve complete recycling, increasing the effective product output and improving the unit's efficiency.

[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: a sludge recycling system for an oil refining unit, comprising a sludge tank, a sludge pump, a feed tank, and a feed pump; the sludge tank is connected to the sludge pump inlet via a sludge pump inlet pipeline, and the sludge pump outlet is connected to the tank area via a sludge pump outlet pipeline; the feed tank's first inlet is connected to a feed device feed pipeline, the feed tank outlet is connected to the feed pump inlet via a feed pump inlet pipeline, and the feed pump outlet is connected to a reaction refining system via a feed pump outlet pipeline; the sludge pump outlet pipeline is connected to a main recycling pipeline, and the main recycling pipeline outlet is connected to the feed tank's second inlet; the main recycling pipeline is connected to a recycling branch pipeline, and the recycling branch pipeline outlet is connected to the feed tank inlet.

[0005] Furthermore, the main remelting pipeline is connected to valves No. 1, No. 2, No. 3, and No. 4 in sequence from upstream to downstream, and the remelting branch pipeline is connected between valves No. 2 and No. 3.

[0006] Furthermore, it also includes a unit start-up line, which is connected to the remelting main pipeline and is connected between valve number two and the remelting branch pipeline.

[0007] Furthermore, valve number six was connected to the start-up line of the unit.

[0008] Furthermore, valve number five is connected to the remelting branch pipeline.

[0009] Furthermore, an isolation valve is connected to the outlet pipeline of the sludge pump, and the isolation valve is connected downstream of the remelting main pipeline.

[0010] Compared with existing technologies, the beneficial effects of this utility model are: it adds a pipeline from the outlet of the sludge pump in the oil refining unit to the inlet of the feed tank or the feed pump inlet. This utility model utilizes modified pipelines to pump the sludge generated by the unit to the feed tank inlet for mixing with other materials before refining, or directly to the feed pump inlet. After the sludge pump starts, all the oil in the sludge tank is refined through the modified process and sent to the feed tank inlet or the feed pump inlet. After a series of reaction refining / upgrading processes and separation and purification by the distillation system, it is sent to downstream units. After being put into operation, approximately 30 tons of sludge are recovered daily, achieving zero discharge of sludge and improving the unit's production efficiency. Attached Figure Description

[0011] Figure 1 This is a flowchart of the present invention;

[0012] In the diagram: 1. Sludge tank; 2. Sludge pump; 3. Raw material tank; 4. Raw material pump; 5. Sludge pump inlet pipeline; 6. Sludge pump outlet pipeline; 7. Recycled main pipeline; 8. Recycled branch pipeline; 9. Unit start-up line; 10. Raw material pump inlet pipeline; 11. Raw material pump outlet pipeline; 12. Unit feed pipeline; 13. Isolation valve; 14. Valve No. 1; 15. Valve No. 2; 16. Valve No. 3; 17. Valve No. 4; 18. Valve No. 5; 19. Valve No. 6. Detailed Implementation

[0013] To make the structure and function of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0014] See appendix Figure 1A waste oil recycling system for an oil refining unit includes a waste oil tank 1, a waste oil pump 2, a feed tank 3, and a feed pump 4. The waste oil tank 1 is connected to the inlet of the waste oil pump 2 via a waste oil pump inlet pipeline 5, and the outlet of the waste oil pump 2 is connected to the tank area via a waste oil pump outlet pipeline 6. The feed pipeline 12 of the feed device is connected to the first inlet of the feed tank 3, and the outlet of the feed tank 3 is connected to the inlet of the feed pump 4 via a feed pump inlet pipeline 10. The outlet of the feed pump 4 is connected to the reaction refining system via a feed pump outlet pipeline 11. A recycling main pipeline 7 is connected to the outlet of the waste oil pump outlet pipeline 6, and the outlet of the recycling main pipeline 7 is connected to the second inlet of the feed tank 3. A recycling branch pipeline 8 is connected to the recycling main pipeline 7, and the outlet of the recycling branch pipeline 8 is connected to the inlet of the feed tank 3.

[0015] The remelting main pipeline 7 is connected to valve 14, valve 15, valve 16 and valve 17 in sequence from upstream to downstream. The remelting branch pipeline 8 is connected between valve 15 and valve 16.

[0016] It also includes a unit start-up line 9, which is connected to the remelting main pipeline 7 and is connected between valve 15 and the remelting branch pipeline 8.

[0017] Valve 19 (No. 6) is connected to line 9 of the unit.

[0018] Valve 18 is connected to the remelting branch pipeline 8.

[0019] An isolation valve 13 is connected to the outlet pipeline 6 of the sludge pump, and the isolation valve 13 is connected downstream of the refining main pipeline 7.

[0020] Before adopting this utility model: when the waste oil is transported out, the temperature of the waste oil in the original waste oil transport process in the boundary area will rise significantly, while the outlet flow rate of the waste oil pump will not change.

[0021] After adopting this utility model: the new recycling process is put into use, with a recycling rate of 5 tons per hour. It takes about 6 hours for the sludge oil tank to drop from 60% to 15%. The recycling cycle is once a day, and the recycling rate is 30 tons per day.

[0022] The general design principle for oil refining units is to equip each unit with two sludge pumps, with a design processing loss of 0.1%. Based on the general design capacity of the oil refining unit, the daily sludge saving through external transportation is 30 tons. All the sludge recycled is distributed into valuable products such as finished oil products and refinery dry gas, resulting in an annual efficiency increase of: 30 * 365 * (5454 - 4104) = 11.5 million yuan. The average product price is calculated at 5454 yuan, and the average raw material cost is calculated at 4104 yuan.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A waste oil recycling system for an oil refining unit, characterized in that: It includes a sludge tank (1), a sludge pump (2), a raw material tank (3), and a raw material pump (4); the sludge tank (1) is connected to the inlet of the sludge pump (2) through the sludge pump inlet pipeline (5), and the outlet of the sludge pump (2) is connected to the tank area through the sludge pump outlet pipeline (6); the first inlet of the raw material tank (3) is connected to the feed pipeline (12), the outlet of the raw material tank (3) is connected to the inlet of the raw material pump (4) through the raw material pump inlet pipeline (10), and the outlet of the raw material pump (4) is connected to the reaction refining system through the raw material pump outlet pipeline (11); the sludge pump outlet pipeline (6) is connected to the refining main pipeline (7), and the outlet of the refining main pipeline (7) is connected to the second inlet of the raw material tank (3); the refining main pipeline (7) is connected to the refining branch pipeline (8), and the outlet of the refining branch pipeline (8) is connected to the inlet of the raw material tank (3).

2. The oil refining system for waste oil recovery in an oil refining unit according to claim 1, characterized in that: The main remelting pipeline (7) is connected to valves No. 1 (14), No. 2 (15), No. 3 (16) and No. 4 (17) in sequence from upstream to downstream. The remelting branch pipeline (8) is connected between valves No. 2 (15) and No. 3 (16).

3. The oil refining system for waste oil recovery in an oil refining unit according to claim 2, characterized in that: It also includes the unit start-up line (9), which is connected to the remelting main pipeline (7) and is connected between the second valve (15) and the remelting branch pipeline (8).

4. The oil refining system for waste oil recovery in an oil refining unit according to claim 3, characterized in that: Valve No. 6 (19) is connected to the start-up line (9) of the unit.

5. A waste oil recycling system for an oil refining unit according to claim 1, characterized in that: Valve No. 5 (18) is connected to the remelting branch pipeline (8).

6. A waste oil recycling system for an oil refining unit according to claim 1, characterized in that: An isolation valve (13) is connected to the outlet pipeline (6) of the sludge pump, and the isolation valve (13) is connected downstream of the refining main pipeline (7).

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