Direct supply type straight-run diesel oil hot discharging system

Abstract

The utility model discloses a direct supply type straight-run diesel oil hot discharging system which comprises a conveying pump, an air cooler, a flow meter, a control valve, a valve and a feeding pump, and a first jumper pipeline, a tenth control valve and a fifth valve are connected between a right side pipeline of the first flow meter and an inlet pipeline of a raw oil buffer tank of a gasoline and diesel oil hydrogenation device; a second jumper pipeline, a seventh flowmeter, an eleventh control valve and a sixth valve are connected between a pipeline on the left side of the second air cooler and an inlet pipeline of a raw oil buffer tank of the gasoline and diesel hydrogenation device; and a third jumper pipeline, a third valve and a fourth valve are connected between the right side pipeline of the first air cooler and the right side pipeline of the second flow meter. According to the utility model, straight-run diesel oil is directly supplied to the gasoline and diesel oil hydrogenation device, so that the fuel gas consumption of the heating furnace is reduced; the normal first-line diesel oil is directly supplied to the diesel oil hydro-upgrading device, so that the heat recovery of the straight-run diesel oil is realized, the fuel gas consumption of a heating furnace is reduced, and the power consumption of a tank field feeding pump is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of refinery equipment transformation, and particularly relates to a direct supply type straight-run diesel hot discharge system. Background Art

[0002] In a conventional refinery, the straight-run diesel oil drawn from the atmospheric side line of the crude oil through the atmospheric and vacuum distillation unit needs to be sent to a secondary processing unit to produce refined diesel oil, such as a gasoline and diesel hydrogenation unit or a diesel hydrogenation upgrading unit, to remove impurities and improve the cetane number of diesel oil, etc., so as to meet the product standards of vehicle diesel oil. However, in actual production, most of the straight-run diesel oil drawn from the atmospheric side line is mixed within the boundary area of the atmospheric and vacuum distillation unit, cooled by air cooling and water cooling, and then sent to the storage tank area, and then pumped from the storage tank area to the gasoline and diesel hydrogenation unit and the diesel hydrogenation upgrading unit. This causes energy waste. First, the heat of the high-temperature straight-run diesel oil is not recovered and utilized. Second, the power consumption of air cooling and the consumption of circulating water for water cooling are increased. Third, the power consumption of the transfer pump in the intermediate storage tank area is increased. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a direct supply type straight-run diesel hot discharge system aiming at the defects existing in the prior art.

[0004] Its technical solution is as follows: A direct supply straight-run diesel hot discharge system includes a transfer pump, an air cooler, a flow meter, a control valve, a valve, and a feed pump. The line for the first side-draw diesel is connected to the input end of the first transfer pump. The output end of the first transfer pump is sequentially connected to one end of the first valve through the first control valve, the first air cooler, the first flow meter, and the fourth control valve. The line for the second side-draw diesel is connected to the input end of the second transfer pump. The output end of the second transfer pump is connected to one end of the second control valve, and the other end of the second control valve is connected to the input end of the second air cooler, one end of the second valve, and one end of the fourth flow meter. The line for the third side-draw diesel is connected to the third transfer pump, and the output end of the third transfer pump is connected to the other end of the second valve through the third control valve. The output end of the second air cooler is connected to one end of the fifth control valve and one end of the third flow meter through the second flow meter. The other end of the fifth control valve is connected to the other end of the first valve and the inlet of the diesel storage tank in the tank farm. The other end of the third flow meter is connected to the inlet of the feedstock buffer tank of the diesel hydro-upgrading unit through the sixth control valve. The other end of the fourth flow meter is connected to the inlet of the feedstock buffer tank of the diesel hydro-upgrading unit through the seventh control valve. The outlet of the diesel storage tank in the tank farm is divided into two paths. One path is sequentially connected to the inlet of the feedstock buffer tank of the gasoline and diesel hydrotreating unit through the first feed pump, the fifth flow meter, and the eighth control valve. The other path is sequentially connected to the inlet of the feedstock buffer tank of the diesel hydro-upgrading unit through the second feed pump, the sixth flow meter, and the ninth control valve. A first cross-connecting pipeline is connected between the pipeline on the right side of the first flow meter and the inlet pipeline of the feedstock buffer tank of the gasoline and diesel hydrotreating unit. A tenth control valve and a fifth valve are provided on the first cross-connecting pipeline. A second cross-connecting pipeline is connected between the pipeline on the left side of the second air cooler and the inlet pipeline of the feedstock buffer tank of the gasoline and diesel hydrotreating unit. A seventh flow meter, an eleventh control valve, and a sixth valve are sequentially provided on the second cross-connecting pipeline from left to right. A third cross-connecting pipeline is connected between the pipeline on the right side of the first air cooler and the pipeline on the right side of the second flow meter. A third valve and a fourth valve are provided on the third cross-connecting pipeline.

[0005] Preferably, the first to eleventh control valves are all ball valves.

[0006] Preferably, the first to sixth valves are all butterfly valves or ball valves.

[0007] Compared with the prior art, the present utility model has the following advantages:

[0008] 1) Reasonable design, simple structure, easy to manufacture or reform;

[0009] 2) By adding the direct feed process of the first side-draw diesel and the second and third side-draw diesel to the gasoline and diesel hydrotreating unit, the direct supply of straight-run diesel to the gasoline and diesel hydrotreating unit is realized, the feed temperature of the gasoline and diesel hydrotreating unit is increased, the heat recovery of the straight-run diesel is realized, and the fuel gas consumption of the feedstock heating furnace of the gasoline and diesel hydrotreating unit is reduced.

[0010] 3) By adding a direct feed process for the No. 1 straight-run diesel to the diesel hydrotreating unit, a cross-line is drawn from the diesel line after the No. 1 straight-run air cooler to the No. 3 straight-run to achieve direct feeding of the No. 1 straight-run diesel to the diesel hydrotreating unit, increasing the feed temperature of the diesel hydrotreating unit, realizing the heat recovery of straight-run diesel, and reducing the fuel gas consumption of the raw material heating furnace in the diesel hydrotreating unit.

[0011] 4) After most of the normal diesel is changed to direct feed, the material sending volume in the tank farm is greatly reduced, reducing the power consumption of the material supply pump in the tank farm. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model. Detailed Embodiments

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are some, rather than all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0014] Refer to Figure 1, A direct supply type straight-run diesel hot discharge system, including a transfer pump, an air cooler, a flowmeter, a control valve, a valve and a feeding pump. The pipeline A for the first normal diesel connects to the input end of the first transfer pump 4. The output end of the first transfer pump 4 is successively connected to one end of the first valve 24 through the first control valve 4, the first air cooler 7, the first flowmeter 9 and the fourth control valve 14. The pipeline B for the second normal diesel connects to the input end of the second transfer pump 2. The output end of the second transfer pump 2 is connected to one end of the second control valve 5. The other end of the second control valve 5 is connected to the input end of the second air cooler 8, one end of the second valve 25 and one end of the fourth flowmeter 18. The pipeline C for the third normal diesel connects to the third transfer pump 3. The output end of the third transfer pump 3 is connected to the other end of the second valve 25 through the third control valve 6. The output end of the second air cooler 8 is connected to one end of the fifth control valve 13 and one end of the third flowmeter 16 through the second flowmeter 11. The other end of the fifth control valve 13 is connected to the other end of the first valve 24 and the inlet of the diesel storage tank 33 in the tank farm. The other end of the third flowmeter 16 is connected to the inlet of the raw material oil buffer tank 34 of the diesel hydro-upgrading unit through the sixth control valve 17. The other end of the fourth flowmeter 18 is connected to the inlet of the raw material oil buffer tank 34 of the diesel hydro-upgrading unit through the seventh control valve 19. The outlet of the diesel storage tank 33 in the tank farm is divided into two paths. One path is successively connected to the inlet of the raw material oil buffer tank 32 of the gasoline and diesel hydro-upgrading unit through the first feeding pump 26, the fifth flowmeter 27 and the eighth control valve 28. The other path is successively connected to the inlet of the raw material oil buffer tank 34 of the diesel hydro-upgrading unit through the second feeding pump 29, the sixth flowmeter 30 and the ninth control valve 31. A first cross-connecting pipeline 41 is connected between the pipeline on the right side of the first flowmeter 9 and the inlet pipeline of the raw material oil buffer tank 32 of the gasoline and diesel hydro-upgrading unit. A tenth control valve 12 and a fifth valve 23 are provided on the first cross-connecting pipeline 41. A second cross-connecting pipeline 42 is connected between the pipeline on the left side of the second air cooler 8 and the inlet pipeline of the raw material oil buffer tank 32 of the gasoline and diesel hydro-upgrading unit. A seventh flowmeter 20, an eleventh control valve 21 and a sixth valve 22 are successively provided on the second cross-connecting pipeline 42 from left to right. A third cross-connecting pipeline 43 is connected between the pipeline on the right side of the first air cooler 7 and the pipeline on the right side of the second flowmeter 11. A third valve 10 and a fourth valve 15 are provided on the third cross-connecting pipeline 43.

[0015] In the present utility model, the first to eleventh control valves are all ball valves. The first to sixth valves are all butterfly valves or ball valves.

[0016] The working process of the present utility model is as follows:

[0017] (1) After adding the first cross-connecting pipeline 41, the direct feeding process of the first normal diesel to the gasoline and diesel hydro-upgrading unit:

[0018] The normal first-line diesel pipeline A is sent to the first air cooler 7 for cooling through the first transfer pump 1 and the first control valve 4. After cooling, it is directly supplied to the raw material oil buffer tank 32 of the gasoline and diesel hydrogenation unit of the gasoline and diesel hydrogenation plant through the first flowmeter 9, the tenth control valve 12 and the fifth valve 23. The temperature of the straight-run diesel hot discharge is controlled by the cooling load of the first air cooler 7 to ensure that the temperature of the mixed raw material oil in the gasoline and diesel hydrogenation unit does not exceed 80 °C.

[0019] (2)After adding the second jumper pipeline 42, the direct supply process of normal second- and third-line diesel to the gasoline and diesel hydrogenation unit:

[0020] The normal second-line diesel pipeline B is mixed with the normal third-line diesel pipeline after passing through the second transfer pump 2 and the second control valve 5 and the third transfer pump 3 and the third control valve 6, and then passes through the seventh flowmeter 20, the eleventh control valve 21 and the sixth valve 22, and is mixed with the cooled normal first-line diesel, and the hot discharge is directly supplied to the raw material oil buffer tank 32 of the gasoline and diesel hydrogenation unit of the gasoline and diesel hydrogenation plant. The temperature of the straight-run diesel hot discharge is controlled by the cooling load of the first air cooler 7 to ensure that the temperature of the mixed raw material oil in the gasoline and diesel hydrogenation unit does not exceed 80 °C.

[0021] (3)The direct supply process of normal first-line diesel to the diesel hydrotreating unit after adding the third jumper pipeline 43:

[0022] The normal first-line diesel pipeline A is sent to the first air cooler 7 for cooling through the first transfer pump 1 and the first control valve 4, and then passes through the third valve 10 and the fourth valve 15, and is mixed with the cooled normal second- and third-line diesel, and is directly supplied to the raw material oil buffer tank 34 of the diesel hydrotreating unit of the diesel hydrotreating plant. Through the sixth control valve 17, the flow rate after mixing the cooled normal first-line diesel and the cooled normal second- and third-line diesel is controlled, and thus the raw material oil composition of the diesel hydrotreating unit is controlled to ensure that the 95% point of the raw material oil does not exceed 365 °C.

[0023] (4)The process of the cooled normal first-line diesel to the tank farm is stopped:

[0024] The process of the cooled normal first-line diesel entering the diesel storage tank 33 in the tank farm through the fourth control valve 14 and the first valve 24 is stopped, that is, the fourth control valve 14 and the first valve 24 are closed.

[0025] (5)The process from the diesel tank farm to the gasoline and diesel hydrogenation unit is stopped:

[0026] The process of the straight-run diesel being transported from the diesel storage tank 33 in the tank farm to the gasoline and diesel hydrogenation unit through the first feeding pump 26, the fifth flowmeter 27 and the eighth control valve 28 is stopped. That is, the first feeding pump 26, the fifth flowmeter 27 and the eighth control valve 28 are closed.

[0027] (6)The two processes of normal second- and third-line diesel to the diesel hydrotreating unit are retained, but the load is adjusted.

[0028] Increase the feed rate of the first direct supply process, and increase the direct hot feed of diesel from the second and third normal distillates to the diesel hydrotreating unit.

[0029] Reduce the feed rate of the second supply path that is transported to the unit through the tank farm, and reduce the amount of diesel from the second and third normal distillates transported to the diesel hydrotreating unit through the diesel tank farm. The load of the second feed pump 29 to the diesel tank farm feed pump of the diesel hydrotreating unit is reduced by 50%, saving the electricity cost.

[0030] The implementation effects that the present utility model can achieve:

[0031] 1. By increasing the direct feed process of the first normal distillate diesel and the second and third normal distillates to the gasoline and diesel hydrotreating unit, the direct supply of straight-run diesel to the gasoline and diesel hydrotreating unit is realized, the feed temperature of the gasoline and diesel hydrotreating unit is increased, the heat recovery of the straight-run diesel is realized, and the fuel gas consumption of the raw material heating furnace of the gasoline and diesel hydrotreating unit is reduced.

[0032] 2. By increasing the direct feed process of the first normal distillate diesel to the diesel hydrotreating unit, a cross line is led from the diesel line after the first normal distillate air cooler to the third normal distillate to realize the direct supply of the first normal distillate diesel to the diesel hydrotreating unit, the feed temperature of the diesel hydrotreating unit is increased, the heat recovery of the straight-run diesel is realized, and the fuel gas consumption of the raw material heating furnace of the diesel hydrotreating unit is reduced.

[0033] 3. After most of the normal diesel is changed to direct feed, the material delivery volume of the tank farm is greatly reduced, and the electricity consumption of the feed pump in the tank farm is reduced.

[0034] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A direct-supply straight-run diesel hot discharge system, comprising a delivery pump, an air cooler, a flow meter, a control valve, a valve and a feed pump, wherein a first-line diesel pipeline is connected to an input end of a first delivery pump, and an output end of the first delivery pump is connected to one end of a first valve in sequence through a first control valve, a first air cooler, a first flow meter and a fourth control valve; a second-line diesel pipeline is connected to an input end of a second delivery pump, and an output end of the second delivery pump is connected to one end of a second control valve, and the other end of the second control valve is connected to an input end of a second air cooler, one end of a second valve and one end of a fourth flow meter; a third-line diesel pipeline is connected to a third delivery pump, and an output end of the third delivery pump is connected to the other end of the second valve through a third control valve; the output end of the second air cooler is connected to the third control valve through the third control valve. The second flowmeter is connected to one end of the fifth control valve and one end of the third flowmeter, the other end of the fifth control valve is connected to the other end of the first valve and the inlet of the diesel storage tank in the tank area, the other end of the third flowmeter is connected to the inlet of the raw oil buffer tank of the diesel hydro-reforming unit through the sixth control valve; the other end of the fourth flowmeter is connected to the inlet of the raw oil buffer tank of the diesel hydro-reforming unit through the seventh control valve; the outlet of the diesel storage tank in the tank area is divided into two routes, one route is connected to the inlet of the raw oil buffer tank of the gasoline and diesel hydro-reforming unit through the first feed pump, the fifth flowmeter and the eighth control valve in sequence, and the other route is connected to the inlet of the raw oil buffer tank of the diesel hydro-reforming unit through the second feed pump, the sixth flowmeter and the ninth control valve in sequence; it is characterized in that: A first jumper line is connected between the right pipeline of the first flow meter and the inlet pipeline of the raw oil buffer tank of the gasoline and diesel hydrogenation unit, and the first jumper line is provided with a tenth control valve and a fifth valve; a second jumper line is connected between the left pipeline of the second air cooler and the inlet pipeline of the raw oil buffer tank of the gasoline and diesel hydrogenation unit, and the second jumper line is provided with a seventh flow meter, an eleventh control valve and a sixth valve from left to right in sequence; a third jumper line is connected between the right pipeline of the first air cooler and the right pipeline of the second flow meter, and the third jumper line is provided with a third valve and a fourth valve.

2. A direct supply straight-run diesel hot discharging system according to claim 1, characterized in that: The first to eleventh control valves are all ball valves.

3. A direct supply straight-run diesel hot discharging system according to claim 1, characterized in that: The first to sixth valves are all butterfly valves or ball valves.

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