TBB raw material pipeline pressure relief device

Abstract

The utility model relates to a TBB raw material pipeline pressure relief device, which belongs to the technical field of petrifaction and comprises a toluene storage tank, a toluene pipeline, a reflux pipeline and a reaction kettle, the toluene pipeline is connected with the bottom of the toluene storage tank and then extends upwards to be communicated to the top of the reaction kettle, and a transfer pump and a check valve are sequentially mounted on one side, close to the toluene storage tank, of the toluene pipeline along the extension direction. One side, close to the reaction kettle, of the methylbenzene pipeline is provided with a pneumatic stop valve, one end of a backflow pipeline is connected to the methylbenzene pipeline between the check valve and the pneumatic stop valve, and the other end of the backflow pipeline is connected to an inlet of the transfer pump. The backflow pipeline is additionally arranged between the check valve and the pneumatic stop valve and connected to the inlet of the transfer pump, toluene in the pipeline can be effectively discharged in time, it is ensured that the toluene pipeline does not have overpressure, the toluene in the pipeline bypasses the check valve and the transfer pump through the backflow pipeline and returns to the storage tank, the pressure of the pipeline is effectively released in time, and the safety of the storage tank is ensured. And the pipeline cannot be pierced out from the weak part of the pipeline, and hidden risks caused by leakage are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemicals, in particular to a TBB raw material pipeline pressure relief device. Background Art

[0002] In the traditional TBB process, the raw material toluene pipeline is directly transported from the tank in the tank area into the reactor. Toluene needs to pass through a transfer pump, a check valve, a pneumatic valve, and a flow meter before being prepared for the reactor. A check valve is installed at the outlet of the transfer pump. The function of the check valve is to prevent the material from flowing back into the storage tank during the feeding process. However, the material cannot flow back into the storage tank after the feeding is completed. This will cause the pipeline from the check valve to the pneumatic shut-off valve to be filled with toluene. As the temperature rises, the volume of toluene in the pipeline expands rapidly, causing the pipeline pressure to rise. Eventually, toluene will often pierce out from the weak flange gasket. Toluene is flammable, explosive, and toxic, and leakage is likely to be dangerous. Utility Model Content

[0003] The utility model aims to provide a TBB raw material pipeline pressure relief device to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A TBB raw material pipeline pressure relief device comprises a toluene storage tank, a toluene pipeline, a reflux pipeline and a reactor, wherein the toluene pipeline is connected to the bottom of the toluene storage tank and then extends upward to be connected to the top of the reactor, a material transfer pump and a check valve are sequentially installed on the toluene pipeline on one side close to the toluene storage tank along the extension direction, a pneumatic shut-off valve is installed on the toluene pipeline on one side close to the reactor, one end of the reflux pipeline is connected to the toluene pipeline between the check valve and the pneumatic shut-off valve, and the other end is connected to the inlet of the material transfer pump.

[0006] Preferably, a flow meter is installed on one side of the pneumatic shut-off valve, and the flow meter is interlocked with the pneumatic shut-off valve and the check valve by setting an interlock switch or an electrical signal sensor. When the accumulated flow meter reaches the set value, the pneumatic shut-off valve and the transfer pump are interlocked and closed.

[0007] Preferably, a hand valve is installed on the reflux pipeline, and the reflux volume of the material transfer pump during material delivery is adjusted by adjusting the opening of the hand valve.

[0008] Preferably, there is a height difference between the pneumatic shut-off valve and the check valve, and the check valve is located below the pneumatic shut-off valve.

[0009] Preferably, one end of the reflux pipe is connected to a toluene pipe between the check valve and the pneumatic shut-off valve, close to the check valve, so that all the toluene in the toluene pipe can be discharged as much as possible.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model can timely and effectively remove toluene in the pipeline to ensure that the toluene pipeline will not be over-pressurized. The device adds a reflux pipeline between the check valve and the pneumatic shut-off valve to be connected to the inlet of the material transfer pump. A manual valve is arranged on the reflux pipeline to keep it normally open, and the reflux amount of the pump during material transfer can be adjusted by the opening of the manual valve. When the feeding is completed, the toluene in the pipeline between the check valve and the pneumatic shut-off valve bypasses the check valve and the material transfer pump through the reflux pipeline to return to the storage tank. The pipeline pressure is timely and effectively released and will not burst out from the weak point of the pipeline, thereby avoiding the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model.

[0013] Reference numerals

[0014] 1. Toluene storage tank, 2. Toluene pipeline, 3. Transfer pump, 4. Check valve, 5. Flow meter, 6. Pneumatic shut-off valve, 7. Reflux pipeline, 8. Hand valve, 9. Reactor. DETAILED DESCRIPTION

[0015] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0016] like Figure 1 As shown, a TBB raw material pipeline pressure relief device includes a toluene storage tank 1, a toluene pipeline 2, a reflux pipeline 7 and a reactor 9. The toluene pipeline 2 is connected to the bottom of the toluene storage tank 1 and then extends upward to be connected to the top of the reactor 9. A transfer pump 3 and a check valve 4 are sequentially installed on the side of the toluene pipeline 2 close to the toluene storage tank 1 along the extension direction. A pneumatic cut-off valve 6 is installed on the side of the toluene pipeline 2 close to the reactor 9. There is a height difference between the pneumatic cut-off valve 6 and the check valve 4, and the check valve 4 is located below the pneumatic cut-off valve 6.

[0017] One end of the reflux pipe 7 is connected to the toluene pipe 2 between the check valve 4 and the pneumatic shut-off valve 6, close to the check valve, and the other end is connected to the inlet of the transfer pump 3, so as to discharge all the toluene in the toluene pipe 2 as much as possible.

[0018] A flow meter 5 is installed on one side of the pneumatic shut-off valve 6. The flow meter 5 is interlocked with the pneumatic shut-off valve 6 and the check valve 4 by setting an interlock switch or an electrical signal sensor. When the accumulated flow meter reaches the set value, the pneumatic shut-off valve 6 and the transfer pump 3 are interlocked and closed.

[0019] A hand valve 8 is installed on the reflux pipeline 7, and the reflux amount of the material transfer pump 3 during material delivery is adjusted by the opening of the hand valve 8.

[0020] Working principle:

[0021] During feeding, most of the toluene flows from the toluene storage tank 1 from the outlet of the transfer pump 3 through the check valve 4 through the toluene pipeline 2 into the workshop reactor 9, and a small amount flows back to the inlet of the transfer pump 3 through the reflux pipeline 7. If the reflux amount is too large, the opening of the reflux pipeline manual valve 8 can be appropriately adjusted to reduce the reflux amount; when the cumulative flow meter reaches the set value, the pneumatic shut-off valve 6 and the transfer pump 3 are interlocked and closed, the feeding is completed, and the toluene in the toluene pipeline 2 uses the gravity generated by the height difference to return to the toluene storage tank 1 through the reflux pipeline 7.

[0022] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A TBB raw material pipeline pressure relief device, characterized by: The invention comprises a toluene storage tank, a toluene pipeline, a reflux pipeline and a reactor. The toluene pipeline is connected to the bottom of the toluene storage tank and then extends upward to the top of the reactor. A material transfer pump and a check valve are sequentially installed on the toluene pipeline on one side close to the toluene storage tank along the extension direction. A pneumatic shut-off valve is installed on the toluene pipeline on one side close to the reactor. One end of the reflux pipeline is connected to the toluene pipeline between the check valve and the pneumatic shut-off valve, and the other end is connected to the inlet of the material transfer pump.

2. A TBB raw material pipeline pressure relief device according to claim 1, characterized in that: A flow meter is installed on one side of the pneumatic shut-off valve, and the flow meter is interlocked with the pneumatic shut-off valve and the check valve by arranging an interlock switch or an electrical signal sensor.

3. A TBB raw material pipeline pressure relief device according to claim 1, characterized in that: A hand valve is installed on the return pipe.

4. A TBB raw material pipeline pressure relief device according to claim 1, characterized in that: There is a height difference between the pneumatic cut-off valve and the check valve, and the check valve is located below the pneumatic cut-off valve.

5. A TBB raw material pipeline pressure relief device according to claim 1, characterized in that: One end of the reflux pipeline is connected to a toluene pipeline between the check valve and the pneumatic cut-off valve and close to one side of the check valve.

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