Automatic dehydration device for dehydrogenation liquid

Abstract

The utility model discloses an automatic dehydration device for dehydrogenation liquid, which belongs to the technical field of energy conservation and consumption reduction and is characterized in that a dehydrogenation liquid pipe is communicated with a dehydrogenation liquid tank, an oil phase chamber and a water phase chamber form an oil-water separation tank, and an overflow plate is arranged between the oil phase chamber and the water phase chamber. Oily water deposited at the bottom of the oil-water liquid separation tank is discharged to the oil-water liquid separation tank through pressure difference and is separated by the overflow plate, the water phase chamber is connected with the dehydrogenation liquid tank through the first pipeline, and the intelligent monitoring system and the first valve body are arranged on the first pipeline, so that the problem of energy consumption caused by the fact that water exists in dehydrogenation liquid is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy saving and consumption reduction, specifically to an automatic dehydration device for dehydrogenation liquid. Background Art

[0002] During the styrene production process, crude styrene is mixed with a small amount of water and fed into the styrene distillation unit as raw material. The separation of this water from the oil will increase the steam consumption of the distillation unit, and the power consumption of the pump will also increase when processing a large amount of water. If a large amount of water is brought in, it will cause tower pressure fluctuations, affecting the stable production of the device. When water is brought into the finished styrene product, the finished styrene product will be unqualified due to reasons such as color, reducing economic benefits. Therefore, the external operator needs to take samples on site and send them to the quality inspection department to analyze the water content in the dehydrogenation liquid. When the water content is high, the water is cut manually. During this process, the amount of water discharged cannot be determined, and a large amount of oil in the water discharge will affect the condensate water quality.

[0003] If a process technology can be developed to automatically separate the water from crude styrene and control the oil in the drainage process, it will achieve stable production of the device, reduce steam consumption and power consumption of water transportation equipment, increase enterprise economic benefits, and improve the qualified rate of styrene finished products. Utility Model Content

[0004] The purpose of the utility model is to provide an automatic dehydration device for dehydrogenation liquid, so as to solve the energy consumption problem caused by the presence of water in the dehydrogenation liquid proposed in the above background technology.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A dehydrogenation liquid automatic dehydration device comprises a dehydrogenation liquid tank, an oil phase chamber, an overflow plate, a water phase chamber and a pump, characterized in that: the dehydrogenation liquid pipe is connected to the dehydrogenation liquid tank, the oil phase chamber and the water phase chamber form an oil-water split tank, the overflow plate is arranged between the oil phase chamber and the water phase chamber, the oily water accumulated at the bottom of the oil-water split tank is discharged to the oil-water split tank through the pressure difference through the separation effect of the overflow plate, the water phase chamber and the dehydrogenation liquid tank are connected through a first pipeline, an intelligent monitoring system and a first valve body are arranged on the first pipeline, and the intelligent monitoring system detects the dehydrogenation liquid online. The water content in the solution in the hydrogen liquid tank will automatically open the first valve body when the water reaches a certain concentration to separate the oil phase and the water phase. The machine pump is connected to the oil phase chamber and the water phase chamber through a tee pipe. The oil phase valve and the water phase valve are set on the tee pipe. The oil-water split tank level gauge is set on the water phase chamber. The machine pump is connected to the stripping tower through a second pipeline. The online analyzer, the selection controller and the second valve body are set on the second pipeline. The third pipeline is set on the second pipeline of the selection controller and the second valve body to communicate with the dehydrogenation liquid tank, and the third valve body is set on the third pipeline.

[0007] Preferably, the first valve body, the second valve body and the third valve body are regulating valves.

[0008] Preferably, the controller model selected is a DCSPID control module, purchased from Zhejiang Zhongkong Technology Co., Ltd.

[0009] Preferably, the intelligent monitoring system model is PGC5000, purchased from ABB of Germany (AbbVie).

[0010] Preferably, the online analyzer is produced by Hach Company (HACH) of the United States, model 3500.

[0011] The technical effects and advantages of this utility model are:

[0012] (1) During the dehydration process of the dehydrogenated liquid, the water content in the dehydrogenated liquid tank is reduced through the oil-water separation system, which provides a good feed composition, lowers the separation temperature, and reduces the steam consumption in the next styrene distillation system, thereby effectively reducing the energy consumption in the subsequent distillation process. At the same time, the water in the dehydrogenated liquid is treated and reused, achieving cost reduction, efficiency improvement, and efficient operation of the styrene unit.

[0013] (2) An intelligent system is designed next to the dehydrogenation liquid tank and the oil-water liquid tank to interlock and control the start and stop operation of the pump, allowing for continuous or intermittent dehydration, reducing the workload of on-site operators. The proposal of this device provides strong theoretical guidance and technical support for the construction of cost reduction and efficiency improvement projects in other fields.

[0014] (3) Through regular sampling and analysis of the water content in the dehydrogenation liquid tank, it was found that under the same operating conditions, the water content in the dehydrogenation liquid tank was significantly improved compared with before the improvement, and the water content in the dehydrogenation liquid tank was ≤0.1%. Due to the instability of the water-carrying system 0 times / year, the steam unit consumption was reduced from 2.3t / t.sm to 2.2t / t.sm, and 500t / a of wastewater was recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a system diagram of the present utility model. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings.

[0017] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

[0018] Example 1

[0019] In one embodiment, see Figure 1A dehydrogenation liquid automatic dehydration device includes a dehydrogenation liquid tank 1, an oil phase chamber 3, an overflow plate 4, a water phase chamber 5 and a pump 8, characterized in that: the dehydrogenation liquid pipe 14 is connected to the dehydrogenation liquid tank 1, the oil phase chamber 3 and the water phase chamber 5 form an oil-water split tank, the overflow plate 4 is arranged between the oil phase chamber 3 and the water phase chamber 5, the oil-containing water accumulated at the bottom of the oil-water split tank is discharged to the oil-water split tank through the pressure difference through the separation effect of the overflow plate 4, the water phase chamber 5 and the dehydrogenation liquid tank 1 are connected through a first pipeline, an intelligent monitoring system 2 and a first valve body 6 are arranged on the first pipeline, the intelligent monitoring system 2 detects the water content in the solution in the dehydrogenation liquid tank online, and automatically detects when the water reaches a certain concentration Open the first valve body 6 to separate the oil phase and the water phase. The machine pump 8 is connected to the oil phase chamber 3 and the water phase chamber 5 through a tee pipe 15. The oil phase valve 30 and the water phase valve 50 are provided on the tee pipe 15. The oil-water split tank level gauge 7 is provided on the water phase chamber 5. The machine pump 8 is connected to the stripping tower 16 through a second pipeline 17. The online analyzer 9, the selection controller 10 and the second valve body 13 are provided on the second pipeline 17. A third pipeline 20 is provided on the second pipeline 17 between the selection controller 10 and the second valve body 13 to communicate with the dehydrogenation liquid tank 1. A third valve body 12 is provided on the third pipeline 20. The first valve body 6, the second valve body 13 and the third valve body 12 are regulating valves.

[0020] Preferably, the controller 10 model is selected as a DCSPID control module, which is purchased from Zhejiang Zhongkong Technology Co., Ltd.

[0021] Preferably, the model of the intelligent monitoring system 2 is PGC5000, purchased from ABB of Germany (Abb).

[0022] The device is used as follows: aqueous dehydrogenation liquid enters the aqueous dehydrogenation liquid pipe 14 and enters the dehydrogenation liquid tank 1. The dehydrogenation liquid tank 1 detects the water content of the solution in the dehydrogenation liquid tank 1 online through the intelligent monitoring system 2. When the water content reaches a certain concentration, the first valve body 6 is automatically opened, and the oily water accumulated in the water phase chamber 5 is discharged into the oil phase chamber 3 through the pressure difference. The entire process is separated by the overflow plate 4, and the oil phase and the water phase are separated. When the liquid level in the water phase chamber reaches a certain value, the water phase in the oil-water split tank is automatically sent to the stripping tower system for recovery through the machine pump 8. An online analyzer 9 and a selection controller 10 are provided. The oil-water split tank level gauge 7 monitors the oil-water split tank liquid level, which is controlled by the third valve body 12 and the second valve body 13. When the water content exceeds a specific value, the second valve body 13 is opened, and the water phase enters the stripping tower 16 for separation. When the water phase does not exceed the set value, the third valve body 12 is opened, and the water phase is returned to the dehydrogenation liquid tank 1.

[0023] The energy-saving and consumption-reducing effect of the new dehydrogenation liquid automatic dehydration device is explored by sampling and analyzing the water content in the dehydrogenation liquid tank 1, and counting the steam consumption and power consumption.

[0024] Comparative Example 1

[0025] The steps include:

[0026] 1) Regularly sample and analyze the water content in the dehydrogenation liquid. When the water content data of the quality inspection is ≥1000ppm after a long period of analysis, manual dehydration is performed by the external operator;

[0027] 2) When the liquid level in the drainage tank is ≥50%, the on-site pump will be started to send all the oily water to the stripping system for separation. If there is a large amount of oil phase, the condensate water will be unqualified.

[0028] 3) On-site sampling cannot always provide feedback on the water content in the high / low tower feed dehydrogenation liquid. In order to avoid the impact of water on the system, the steam usage of the distillation tower needs to be adjusted at all times. The comparative data are as follows:

[0029]

[0030] Summary: Based on the above data, the embodiment designed an automatic dehydration device for dehydrogenated liquid, and its dehydration effect was significantly better than that of the comparative example. It can effectively avoid the hysteresis of sampling analysis and the unqualified condensate water caused by oil in the stripping system, while reducing the risk of fluctuations in production operation.

Claims

1. A dehydrogenation liquid automatic dehydration device, comprising a dehydrogenation liquid tank (1), an oil phase chamber (3), an overflow plate (4), a water phase chamber (5) and a pump (8), characterized in that: The dehydrogenation liquid pipe (14) is connected to the dehydrogenation liquid tank (1), the oil phase chamber (3) and the water phase chamber (5) form an oil-water split tank, the overflow plate (4) is arranged between the oil phase chamber (3) and the water phase chamber (5), the water phase chamber (5) and the dehydrogenation liquid tank (1) are connected through a first pipeline, an intelligent monitoring system (2) and a first valve body (6) are arranged on the first pipeline, the machine pump (8) is connected to the oil phase chamber (3) and the water phase chamber (5) through a three-way pipe (15), and the oil phase valve (3) is arranged on the three-way pipe (15). 0) and a water phase valve (50), an oil-water liquid tank level gauge (7) is provided on the water phase chamber (5), a machine pump (8) and a stripping tower (16) are connected via a second pipeline (17), an online analyzer (9), a selection controller (10) and a second valve body (13) are provided on the second pipeline (17) between the selection controller (10) and the second valve body (13), a third pipeline (20) is provided on the second pipeline (17) between the selection controller (10) and the second valve body (13) and is communicated with the dehydrogenation liquid tank (1), and a third valve body (12) is provided on the third pipeline (20).

2. The automatic dehydration device for dehydrogenation liquid according to claim 1, characterized in that: The first valve body (6), the second valve body (13) and the third valve body (12) are regulating valves.

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