CN219317283U

CN219317283U - Propane dehydrogenation device reactor vacuum pumping system

Info

Publication number: CN219317283U
Application number: CN202223601995.6U
Authority: CN
Inventors: 陈尊仲; 刘晓成; 张波杰; 万亿青; 陈自晓; 王旭; 施墨辉; 唐新胜
Original assignee: Ningbo Golden Hair New Materials Co ltd
Current assignee: Ningbo Golden Hair New Materials Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-07-07
Anticipated expiration: 2032-12-27

Abstract

The utility model relates to a propane dehydrogenation device reactor vacuumizing system, which comprises the following components: the ejector is provided with a working fluid inlet, an ejection fluid inlet and a mixed fluid outlet, wherein the working fluid inlet is communicated with a steam pipeline for conveying steam, and the ejection fluid inlet is communicated with the propane dehydrogenation device reactor; the steam pipeline is also provided with a main control valve for controlling the flow of the steam pipeline, the main control valve is electrically connected with a controller of the propane dehydrogenation device reactor, and the controller closes or increases the opening of the main control valve according to the acquired state signal of whether the reactor is in a vacuumizing isolation period. After the main control valve on the steam pipeline is electrically connected with the controller of the propane dehydrogenation device reactor, the opening of the main valve can be automatically adjusted according to sequential control, when the reactor is vacuumized, the medium-pressure steam main control valve is fully opened, and the medium-pressure steam main control valve is closed during the vacuumizing interval of the reaction system, so that the medium-pressure steam waste is reduced.

Description

Propane dehydrogenation device reactor vacuum pumping system

Technical Field

The utility model relates to the technical field of propane dehydrogenation devices, in particular to a reactor vacuumizing system of a propane dehydrogenation device.

Background

The propane dehydrogenation device reactor is subjected to dehydrogenation, steam blowing, regeneration, vacuumizing and reduction circulation steps according to a time sequence device, and the reactor is required to be subjected to vacuumizing/reduction steps before dehydrogenation, so that the vacuumizing medium-pressure steam control valve is fully opened to ensure the vacuum degree of the whole reaction system. The reactor vacuum system in the propane dehydrogenation unit is required to draw out the air remaining in the reactor at intervals of about 3 minutes.

The reaction system of the propane dehydrogenation device in the factory of the applicant consists of 5 reactors, and according to sequential control of a timer, a time interval of 170 seconds exists between the vacuumizing of the first reactor and the vacuumizing of the second reactor, and theoretically, the vacuumizing system can not operate in the time interval of 170 seconds, but in order to maintain the stability of a medium-pressure steam pipe network, the vacuumizing ejector has a phenomenon of empty vacuumizing in the time interval of 170 seconds, so that a great amount of medium-pressure steam is wasted.

Therefore, there is a need for further improvements in existing propane dehydrogenation unit reactor evacuation systems.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a propane dehydrogenation device reactor vacuumizing system capable of avoiding the problem of steam waste caused by air pumping during the interval operation of a plurality of reactors.

The technical scheme adopted for solving the technical problems is as follows: a propane dehydrogenation unit reactor evacuation system comprising:

the ejector is provided with a working fluid inlet, an ejection fluid inlet and a mixed fluid outlet, wherein the working fluid inlet is communicated with a steam pipeline for conveying steam, and the ejection fluid inlet is communicated with the propane dehydrogenation device reactor;

the steam pipeline is also provided with a main control valve for controlling the flow of the steam pipeline, the main control valve is electrically connected with a controller of the propane dehydrogenation device reactor, and the controller closes or increases the opening of the main control valve according to the acquired state signal of whether the reactor is in a vacuumizing isolation period.

In order to reduce the influence on the pressure stability of the medium-pressure steam pipe network as small as possible, the opening of the main control valve is as follows when the reactor is in the vacuumizing isolation period state: 40% -95%. Of course, it is conceivable that, because the reactor operating conditions are variable, the opening range of the control valve may be adjusted according to the actual operating conditions to conform to the optimal operating conditions.

As an improvement, the hydraulic control system further comprises a branch pipeline connected with the main control valve in parallel, and a secondary control valve is arranged on the branch pipeline.

Because the medium-pressure steam main control valve is frequently switched on and off, faults are easy to occur, a group of standby auxiliary control valves are newly added, and the auxiliary control valves can be switched in time after the main control valve is in fault, so that the stable and safe operation of the device is ensured.

As an improvement, the auxiliary control valve is also electrically connected with a controller of the propane dehydrogenation device reactor, and the controller closes or increases the opening of the auxiliary control valve according to the acquired state signal of whether the reactor is in the vacuumizing isolation period.

As an improvement, when the reactor is in the state of vacuumizing isolation period, the opening of the auxiliary control valve is as follows: 40% -95%.

As an improvement, the bypass line and the secondary control valve are located above the steam line.

By the design, the auxiliary control valve can be prevented from carrying liquid, wherein the auxiliary control valve is upwards installed, condensate can be automatically discharged during normal operation, and the auxiliary control valve can be used without drainage.

Compared with the prior art, the utility model has the advantages that: after the main control valve on the steam pipeline is electrically connected with the controller of the propane dehydrogenation device reactor (namely, the sequential control of the time sequence device incorporated into the reactor), the opening of the main valve can be automatically adjusted according to the sequential control, when the reactor is vacuumized, the medium-pressure steam main control valve is fully opened, and the medium-pressure steam main control valve is closed during the vacuumizing interval of the reaction system, so that the waste of medium-pressure steam is reduced; on the other hand, since the main control valve is not completely closed during the evacuation interval of the reaction system, the fluctuation of the medium-pressure steam pipe network is also reduced to some extent,

drawings

FIG. 1 is a flow chart of a propane dehydrogenation unit reactor vacuum pumping system in accordance with an embodiment of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Referring to fig. 1, a propane dehydrogenation unit reactor vacuum system includes an eductor 10 disposed on a vapor line and a valve assembly for regulating and controlling flow on the vapor line. The eductor 10 has a working fluid inlet 11, an eductor fluid inlet 12, and a mixed fluid outlet 13. The working fluid inlet is connected to the steam pipeline 20, and the injection fluid inlet is communicated with the propane dehydrogenation unit reactor through a corresponding pipeline 40. The negative pressure generated after the medium-pressure steam passes through the ejector 10 can pump out the air remained in the reactor and send the air to the downstream through the mixed fluid outlet 13.

The valve assembly comprises a main control valve 21 for controlling the flow of the steam line 20. In this embodiment, the control of the main control valve 21 on the steam pipeline is incorporated into the sequential control of the reactor, that is, the control system is electrically connected with the controller of the propane dehydrogenation unit reactor, so that the main valve opening can be automatically adjusted according to the sequential control, for example, when the reactor is vacuumized, the middle pressure steam main control valve 21 is fully opened, and the middle pressure steam main control valve 21 is correspondingly small during the vacuumized interval of the reaction system, so that the waste of middle pressure steam is reduced. In a preferred scheme, when the reactor is in a vacuumizing isolation period state, the opening of the main control valve 21 is as follows: 40% -95%. Of course, it is conceivable that, because the reactor operating conditions are variable, the opening range of the control valve may be adjusted according to the actual operating conditions to conform to the optimal operating conditions.

Since the main control valve 21 is not completely closed during the evacuation interval of the reaction system, the fluctuation of the medium pressure steam pipe network is also reduced to some extent, and in the preferred embodiment, the opening of the main control valve 21 is gradually adjusted when the reactor enters the evacuation isolation stage, for example, when the reactor initially enters the evacuation isolation stage, the opening of the main control valve 21 may be adjusted to 90% first, and then adjusted to a proper opening size, for example, 50% according to a gradient.

Since the medium-pressure steam main control valve 21 is frequently switched on and off and is easy to fail, a group of standby auxiliary control valves 31 are additionally arranged in the embodiment, and the auxiliary control valves can be switched in time after the main control valve 21 fails, so that the stable and safe operation of the device is ensured. Specifically, the auxiliary control valve 31 is disposed on the branch pipeline 30 connected in parallel with the main control valve 21, and the branch pipeline 30 and the auxiliary control valve 31 are disposed above the steam pipeline, so that the condensate can be automatically discharged during normal operation, and the standby auxiliary control valve 31 can be prevented from carrying liquid, i.e. can be put into use without drainage.

The secondary control valve 31 on the branch line 30 is also electrically connected to the controller of the propane dehydrogenation unit reactor as in the main control valve 21, and the controller closes or increases the opening degree of the secondary control valve 31 according to the acquired status signal of whether the reactor is in the evacuation isolation period, and the control process of the secondary control valve 31 is identical to that of the main control valve 21. In the state where the reactor is in the evacuation isolation period, the opening degree of the sub-control valve 31 is also: 40% -95%.

Claims

1. A propane dehydrogenation unit reactor evacuation system comprising:

the ejector (10) is provided with a working fluid inlet, an ejection fluid inlet and a mixed fluid outlet, wherein the working fluid inlet is communicated with a steam pipeline (20) for conveying steam, and the ejection fluid inlet is communicated with the propane dehydrogenation device reactor;

the method is characterized in that: the steam pipeline (20) is also provided with a main control valve (21) for controlling the flow of the steam pipeline (20), the main control valve (21) is electrically connected with a controller of the propane dehydrogenation device reactor, and the controller closes or increases the opening of the main control valve (21) according to the acquired state signal of whether the reactor is in a vacuumizing isolation period.

2. The propane dehydrogenation unit reactor vacuum pumping system of claim 1, wherein: and when the reactor is in a vacuumizing isolation period state, the opening degree of the main control valve (21) is as follows: 40% -95%.

3. The propane dehydrogenation unit reactor vacuum pumping system according to claim 1 or 2, characterized in that: the hydraulic control system further comprises a branch pipeline (30) connected with the main control valve (21) in parallel, and a secondary control valve (31) is arranged on the branch pipeline (30).

4. A propane dehydrogenation unit reactor vacuum-pumping system as in claim 3, wherein: the auxiliary control valve (31) is also electrically connected with a controller of the propane dehydrogenation device reactor, and the controller closes or increases the opening of the auxiliary control valve (31) according to the acquired state signal of whether the reactor is in the vacuumizing isolation period.

5. The propane dehydrogenation unit reactor vacuum pumping system of claim 4, wherein: and when the reactor is in a vacuumizing isolation period state, the opening degree of the auxiliary control valve (31) is as follows: 40% -95%.

6. A propane dehydrogenation unit reactor vacuum-pumping system as in claim 3, wherein: the bypass line (30) and the secondary control valve (31) are located above the steam line.