Benzene hydrogenation device based on novel drainage structure

Abstract

The utility model provides a benzene hydrogenation device based on a novel liquid discharge structure, which comprises a high-pressure separator, the high-pressure separator is provided with a gas phase outlet, an oil phase outlet and a water phase outlet, the gas phase outlet is connected with a circulator trap through a pipeline, the oil phase outlet is connected with a stabilizing tower through a pipeline, and the water phase outlet is connected with a water bag through a pipeline. The circulator trap is provided with a liquid outlet, the circulator trap is connected with a secondary separation tank at the liquid outlet through a pipeline, the pipeline is connected with a liquid inlet of the secondary separation tank, and the secondary separation tank is used for separating an oil phase from a water phase; the secondary separation tank is arranged and is connected with the circulator trap through a pipeline, so that an oil-phase component and a water-phase component of liquid gathered in the circulator trap are separated, a worker can collect the separated oil-phase component, and waste of the oil-phase component caused by direct discharge is reduced; meanwhile, the separation of the oil-phase component and the water-phase component is also convenient for workers to treat the water-phase component.

Description

Technical Field

[0001] The utility model relates to the technical field of benzene hydrogenation, in particular to a benzene hydrogenation device based on a novel liquid drainage structure. Background Art

[0002] During the normal production process, the crude benzene raw material will first go through a pretreatment link and then be sent into a pre-reactor and a main reactor. Under certain pressure and temperature, it participates in the hydrogenation reaction. The material after the hydrogenation reaction will enter a high-pressure separator for separation of gas phase, oil phase and water phase. The gas-phase components will be guided to a compressor through a circulator trap to participate in the subsequent circulation process; the oil-phase components will be transported to a stabilizer column to continue participating in the treatment of the next process, and the water-phase components will be discharged to an acid water treatment system for treatment according to environmental protection requirements.

[0003] When the gas-phase components separated by the high-pressure separator are discharged to the outside, due to reasons such as temperature and pressure, the liquid that has not been fully settled in the high-pressure separator will enter the circulator trap together with the gas-phase components and then settle and accumulate in the circulator trap. In order to ensure the working performance of the circulator trap, the staff will regularly discharge the liquid in the circulator trap. However, the liquid in the circulator trap contains oil-phase components and water-phase components. If directly discharged, there will be a waste of oil-phase components. Summary of the Invention

[0004] The purpose of the utility model is to provide a benzene hydrogenation device based on a novel liquid drainage structure, aiming to solve the problem of waste of oil-phase components caused by direct discharge of the liquid accumulated in the circulator trap in the general technology.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: The benzene hydrogenation device based on a novel liquid drainage structure includes a high-pressure separator. The high-pressure separator is provided with a gas-phase outlet, an oil-phase outlet and a water-phase outlet. A circulator trap is connected to the gas-phase outlet through a pipeline, a stabilizer column is connected to the oil-phase outlet through a pipeline, and a water bag is connected to the water-phase outlet through a pipeline. The circulator trap is provided with a liquid drainage port, and a secondary separation tank is connected to the liquid drainage port of the circulator trap through a pipeline and the pipeline is connected to the liquid inlet of the secondary separation tank. The secondary separation tank is used for separating oil phase and water phase.

[0006] The beneficial effects are as follows: By providing a secondary separation tank and connecting it to the circulator trap through a pipeline, the liquid accumulated in the circulator trap is separated into an oil phase component and an aqueous phase component, enabling the staff to collect the separated oil phase component and reducing the waste of the oil phase component caused by direct discharge. At the same time, the separation of the oil phase component and the aqueous phase component also facilitates the staff to treat the aqueous phase component, reducing the burden on the equipment caused by treating the oil phase component and the aqueous phase component together and reducing the difficulty of treating the oil phase component and the aqueous phase component together.

[0007] A further technical solution of the present utility model is that the water bag is provided with a drain hole, and the water bag is connected to the liquid inlet of the secondary separation tank through a pipeline at the drain hole.

[0008] The beneficial effects are as follows: Since the water phase separated by the high-pressure separator is not completely separated, the liquid in the water bag contains both an aqueous phase component and an oil phase component. By connecting the drain hole of the water bag to the liquid inlet of the secondary separation tank through a pipeline, the liquid in the water bag enters the secondary separation tank for secondary separation of the oil phase component and the aqueous phase component, reducing the waste of the oil phase component caused by the direct discharge of the aqueous phase component in the water bag.

[0009] A further technical solution of the present utility model is that a front stop valve and a rear stop valve are both provided on the pipeline between the circulator trap and the secondary separation tank and on the pipeline between the water bag and the secondary separation tank, and the front stop valve and the rear stop valve are connected in series.

[0010] The beneficial effects are as follows: The series arrangement of the front stop valve and the rear stop valve can achieve sectional control of the pipeline, facilitating later maintenance work by the staff. At the same time, the series arrangement of the front stop valve and the rear stop valve can also prevent the liquid in the pipeline from flowing back to a certain extent.

[0011] A further technical solution of the present utility model is that a regulating valve is provided between the front stop valve and the rear stop valve, and the regulating valve is connected in series with the front stop valve and the rear stop valve.

[0012] The beneficial effects are as follows: By installing a regulating valve to adjust the flow rate and pressure of the liquid in the pipeline, and the regulating valve is installed between the front stop valve and the rear stop valve, precise control of the flow rate and pressure can be achieved without affecting the truncation function, enabling the regulating valve to be applicable to different working conditions. At the same time, the series installation of the regulating valve with the front stop valve and the rear stop valve also facilitates the staff to carry out maintenance work on each valve.

[0013] A further technical solution of the present utility model is that liquid level gauges are both provided in the circulator trap and in the water bag.

[0014] The beneficial effect is: by setting a liquid level meter in the circulator trap and the water bag, it is convenient for the staff to understand the liquid level in the circulator trap and the water bag, and then open the valve for secondary separation, reducing the impact of excessive liquid level on the service life of the equipment.

[0015] A further technical solution of the utility model is that a signal transmitter is provided on the liquid level meter, the regulating valve is connected to a signal receiver, the signal receiver is connected to a controller, the signal receiver is used to receive the signal of the signal transmitter and transmit it to the controller, the controller is used to control the opening and closing of the regulating valve, and the regulating valve, liquid level meter, signal transmitter, signal receiver and controller constitute an automatic regulating system.

[0016] The beneficial effects are: by forming an automatic adjustment system consisting of a regulating valve, a liquid level meter, a signal transmitter, a signal receiver and a controller, the liquid levels in the circulator collector and the water bag are automatically controlled, reducing the probability of operation by staff and improving the safety factor; at the same time, the existence of the automatic adjustment system reduces the probability of manual operation of the valve, reduces the damage to the valve caused by staff operating errors, and thus increases the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model.

[0018] In the figure: 1. High-pressure separator; 2. Circulator collector; 3. Stabilization tower; 4. Water bag; 5. Secondary separation tank; 6. Front stop valve; 7. Rear stop valve; 8. Regulating valve; 9. Raw material buffer tank; 10. Water treatment system. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1 The specific implementation methods of the utility model are further described.

[0020] like Figure 1 As shown, a benzene hydrogenation device based on a novel liquid discharge structure includes a high-pressure separator 1, on which a gas phase outlet, an oil phase outlet and a water phase outlet are opened. The gas phase outlet, the oil phase outlet and the water phase outlet are used to discharge the gas phase components, the oil phase components and the water phase components separated by the high-pressure separator 1 out of the high-pressure separator 1.

[0021] The high-pressure separator 1 is connected to the stabilization tower 3 through a pipeline at the oil phase outlet. The oil phase components are transported to the stabilization tower 3 through the pipeline, and the stabilization tower 3 collects the oil phase components.

[0022] The high-pressure separator 1 is connected to a water bag 4 through a pipeline at the water phase outlet, and the water phase components enter the water bag 4 through the pipeline.

[0023] The high-pressure separator 1 is connected to a circulator collector 2 at the gas phase outlet pipeline, and the circulator collector 2 guides the gas phase components to the compressor so that the gas phase components can participate in the subsequent circulation process.

[0024] Since the gaseous component will entrain a part of the liquid when moving toward the circulator collector 2, the liquid will eventually gather in the circulator collector 2 under the sedimentation effect of gravity; since the liquid entrained by the gaseous component contains not only water phase components but also oil phase components, in order to discharge the liquid accumulated in the circulator collector 2, a drain port is opened at the bottom of the circulator collector 2, and the bottom of the circulator is connected to a secondary separation tank 5 at the drain port through a pipeline and is connected to the liquid inlet of the pipeline secondary separation tank 5.

[0025] The secondary separation tank 5 is used for separating the oil phase and the water phase, and the secondary separation tank 5 is connected by a pipeline and is in communication with a raw material buffer tank 9 and a water treatment system 10. In view of the density of the oil phase components and the water phase components, in this embodiment, the raw material buffer tank 9 is arranged at the upper end of the secondary separation tank 5, and the water treatment system 10 is arranged at the lower end of the secondary separation tank 5. The oil phase component separated by the secondary separation tank 5 enters the raw material buffer tank 9 to continue to participate in the separation of the high-pressure separator 1, and the water phase component separated by the secondary separation tank 5 enters the water treatment system 10 and is discharged after being treated by the water system.

[0026] In order to facilitate control of the amount of liquid in the circulator trap 2 flowing to the secondary separation tank 5 , a front stop valve 6 and a rear stop valve 7 are installed on the pipeline between the circulator trap 2 and the secondary separation tank 5 .

[0027] In this embodiment, the front stop valve 6 and the rear stop valve 7 are both manual ball valves.

[0028] In order to reduce the number of times the staff opens the front stop valve 6 and the rear stop valve 7 during the separation process of the high-pressure separator 1, an automatic adjustment system is installed between the circulator collector 2 and the secondary separation tank 5.

[0029] The automatic adjustment system includes a liquid level meter, a signal transmitter, a signal receiver, a controller and a controller. The liquid level meter is installed inside the circulator collector 2 to detect the liquid level. The regulating valve 8 is installed in series between the front stop valve 6 and the rear stop valve 7. The signal transmitter is installed on the liquid level meter. The signal receiver is installed on the regulating valve 8 and connected to the controller. The liquid level detected by the liquid level meter is sent to the signal receiver via the signal transmitter. The signal receiver sends the received signal to the controller, and the opening and closing of the regulating valve 8 are controlled by the controller.

[0030] In this embodiment, the regulating valve 8 is an electric regulating valve 8 .

[0031] Since the water phase component in the water bag 4 also contains a certain amount of oil phase component, in the present embodiment, a drainage hole is opened at the bottom of the water bag 4, and a pipeline is connected and communicated at the drainage hole, and the other end of the pipeline is connected to the liquid inlet of the secondary separation tank 5, so that the water phase component in the water bag 4 is subjected to secondary separation of the oil phase and the water phase through the secondary separation tank 5.

[0032] In order to facilitate control of the amount of the aqueous phase component in the water bag 4 transported toward the secondary separation tank 5 , a front stop valve 6 and a rear stop valve 7 are installed on the pipeline between the water bag 4 and the secondary separation tank 5 .

[0033] In order to accurately control the flow rate of the water phase in the water bag 4 toward the secondary separation tank 5 , an automatic adjustment system is also provided between the water bag 4 and the secondary separation tank 5 , wherein a liquid level meter is installed inside the water bag 4 .

[0034] The implementation principle of this embodiment is: before the high-pressure separator 1 performs separation, check whether the front stop valve 6 and the rear stop valve 7 are in a closed state, set the maximum value and the minimum value for the controller, and open the regulating valve 8 through the controller when the received value is greater than the maximum value, and close the regulating valve 8 through the controller when the received value is greater than the minimum value.

[0035] A pneumatic high-pressure separator 1, wherein the gas phase component, oil phase component and water phase component separated by the high-pressure separator 1 are respectively transported to a circulator collector 2, a stabilization tower 3 and a water bag 4 through pipelines.

[0036] As the high-pressure separator 1 separates, the liquid in the circulator trap 2 is gathered, and the liquid level meter detects the liquid level of the gathered liquid. When the value detected by the liquid level meter is greater than the maximum value, the signal transmitter sends it to the signal receiver and transmits it to the controller. The controller opens the regulating valve 8, and the liquid gathered in the circulator trap 2 enters the secondary separation tank 5. The secondary separation tank 5 performs secondary separation on the liquid gathered in the circulator trap 2, and transports the separated oil phase component to the raw material buffer tank 9, and the separated water phase component enters the water treatment system 10; when the value detected by the liquid level meter is lower than the minimum value, the controller closes the regulating valve 8.

[0037] At the same time, the water phase components in the water bag 4 gradually increase with the separation of the high-pressure separator 1. The liquid level meter installed in the water bag 4 detects the liquid level of the water phase components. When the set maximum value is reached, the controller opens the regulating valve 8 to discharge it toward the secondary separation tank 5. The secondary separation tank 5 performs secondary separation of the oil phase and the water phase on the water phase components, and discharges the oil phase and the water phase to the raw material buffer tank 9 and the water treatment system 10 respectively; when the value detected by the liquid level meter is less than the minimum value, the controller closes the regulating valve 8.

Claims

1. A benzene hydrogenation device based on a novel liquid discharge structure, characterized in that: The invention comprises a high-pressure separator (1), wherein the high-pressure separator (1) is provided with a gas phase outlet, an oil phase outlet and a water phase outlet, wherein the gas phase outlet is connected to a circulator collector (2) via a pipeline, wherein the oil phase outlet is connected to a stabilization tower (3), wherein the water phase outlet is connected to a water bag (4), wherein the circulator collector (2) is provided with a liquid discharge outlet, wherein the circulator collector (2) is connected to a secondary separation tank (5) via a pipeline at the liquid discharge outlet and the pipeline is connected to a liquid inlet of the secondary separation tank (5), wherein the secondary separation tank (5) is used for separating the oil phase and the water phase.

2. The benzene hydrogenation device based on the novel liquid discharge structure according to claim 1 is characterized in that: The water bag (4) is provided with a drainage hole, and the water bag (4) is connected to the liquid inlet of the secondary separation tank (5) through a pipeline at the drainage hole.

3. A benzene hydrogenation device based on a novel liquid discharge structure according to claim 1 or 2, characterized in that: A front stop valve (6) and a rear stop valve (7) are provided on the pipeline between the circulator collector (2) and the secondary separation tank (5) and on the pipeline between the water bag (4) and the secondary separation tank (5), and the front stop valve (6) and the rear stop valve (7) are connected in series.

4. The benzene hydrogenation device based on the novel liquid discharge structure according to claim 3 is characterized in that: A regulating valve (8) is provided between the front stop valve (6) and the rear stop valve (7), and the regulating valve (8) is connected in series with the front stop valve (6) and the rear stop valve (7).

5. The benzene hydrogenation device based on the novel liquid discharge structure according to claim 4 is characterized in that: Liquid level gauges are provided in the circulator collector (2) and in the water bag (4).

6. The benzene hydrogenation device based on the novel liquid discharge structure according to claim 5 is characterized in that: The liquid level gauge is provided with a signal transmitter, the regulating valve (8) is connected to a signal receiver, the signal receiver is connected to a controller, the signal receiver is used to receive the signal from the signal transmitter and transmit it to the controller, the controller is used to control the opening and closing of the regulating valve (8), the regulating valve (8), the liquid level gauge, the signal transmitter, the signal receiver and the controller constitute an automatic regulating system.

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