Novel liquid drainage device for liquid separation tank

Abstract

The utility model provides a novel liquid drainage device for a liquid separation tank, which belongs to the field of production of acetylene from natural gas and related chemical industry, and comprises a liquid separation tank, a tank bottom valve, a flushing water valve and an in-situ water pipe network, a through hole is formed in the center of the bottom of the liquid separation tank, and the tank bottom valve is mounted in the through hole and hermetically connected with the through hole; the drainage pipeline connected with the lower end of the tank bottom valve is connected with an in-situ water pipe network through a flushing pipeline; and a flushing water valve is arranged on the flushing pipeline. According to the device, the tank bottom valve is arranged at the bottom of the liquid separation tank, meanwhile, the flushing pipeline is additionally arranged to flush the liquid drainage pipeline, the flushing water valve is closed in the liquid drainage process, and the tank bottom valve is opened for liquid drainage; and after liquid drainage is completed, the tank bottom valve is closed, and the flushing water valve is opened, so that the polymer remained in the liquid drainage pipeline is flushed, continuous flushing of the liquid drainage pipeline is realized, blockage of the liquid drainage pipeline is avoided, and the operation cycle of the device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to natural gas preparation acetylene and related chemical industry production field, concretely relates to a novel device of liquid discharge of liquid separation tank. BACKGROUND

[0002] The acetylene device S301 is a cracking gas liquid separation tank, and its role is to separate and discharge the water in the cracking gas, so as to control the water content in the cracking gas. Figure 3 As shown in the existing flow chart, the liquid level interlock of the liquid separation tank adopts 75% and 30%; when the tank body liquid level reaches 75%, the YV3004 valve is opened, and the water in the tank is discharged to the local water system by pressure difference; when the liquid level reaches 30%, the YV3004 is automatically closed to prevent high-pressure gas from entering the low-pressure system.

[0003] Because the cracking gas contains high acetylene such as diacetylene and propyne, which will gradually generate polymers during operation, the polymers will be blocked in the liquid discharge pipeline during the liquid discharge process, so that the S301 cannot normally discharge liquid, and the device needs to be shut down for maintenance.

[0004] The publication number CN105126577A discloses an acetylene purification waste sodium hypochlorite desorption acetylene gas purification device, which mainly comprises a gas washing tank device and a self-control system thereof.

[0005] The existing device is complex and cannot realize continuous flushing of the liquid discharge pipeline, which avoids the blockage of the liquid discharge pipeline. UTILITY MODEL CONTENTS

[0006] In order to overcome the problem of polymer blockage of the liquid separation tank and the liquid discharge pipeline in the prior art, the utility model provides a novel device of liquid discharge of liquid separation tank.

[0007] The technical scheme adopted by the utility model is as follows:

[0008] A new type of liquid separation tank liquid discharge device, including liquid separation tank, tank bottom valve, flushing water valve and local water pipe network, the bottom of the tank is provided with a through hole in the center position, the tank bottom valve is installed in the through hole and is sealedly connected, the tank bottom valve is connected with the liquid discharge pipeline, and the flushing pipeline is connected with the local water pipe network, and the flushing pipeline is provided with a flushing water valve.

[0009] The side wall of the liquid separation tank is provided with an inlet for cracked gas from the compressor, the top of the liquid separation tank is provided with an outlet for cracked gas leading to a butadiyne absorption tower, and the bottom of the liquid separation tank is provided with a liquid discharge port.

[0010] The tank bottom valve and the liquid separation tank are connected and fixed through a tank bottom connecting flange body.

[0011] The tank bottom valve comprises an air pump, a valve core and a liquid passage, the lower end of the valve core is connected with the air pump, the air pump is located directly below the through hole in the bottom of the liquid separation tank, and the liquid passage is obliquely arranged and forms an acute angle with the vertically arranged air pump.

[0012] The air supply pressure of the air pump is 0.45-0.7 MPa.

[0013] The tank bottom valve is opened to closed and closed to opened, and the time is not more than 20s.

[0014] The height of the valve core is 13.2 cm.

[0015] The included angle between the liquid passage and the vertically arranged air pump is 45°.

[0016] The liquid passage and the liquid discharge pipeline discharging to the degassing tower are connected through a flange.

[0017] The local water pipe network provides local water for the flushing pipeline, and the water supply pressure of the provided local water is 0.4-0.6 MPa.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model provides a new type of liquid separation tank liquid discharge device is equipped with tank bottom valve in the bottom of liquid separation tank, increases flushing pipeline to flush the liquid discharge pipeline simultaneously, realizes continuous flushing liquid discharge pipeline, avoids liquid discharge pipeline blockage, prolongs device operation cycle.

[0020] The utility model provides a novel liquid separation tank liquid discharge device closes the flush water valve in the liquid discharge process, opens the tank bottom valve and carries out the liquid discharge, closes the tank bottom valve after the liquid discharge is completed, and opens the flush water valve, and the residual polymer in the liquid discharge pipeline is flushed clean, so as to ensure that the liquid discharge operation is normal. Provide the basis for subsequent operation, ensure that a large amount of polymer does not deposit in the liquid discharge pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 It is a tank bottom valve structure schematic diagram.

[0023] Figure 3 It is a pyrolysis gas liquid separation tank original flow chart.

[0024] The utility model will be further described in detail below in combination with the drawings.

[0025] In the drawings, the reference signs are:

[0026] 1, tank body;2, tank bottom valve;3, flush water valve;4, flush pipeline;

[0027] 201, gas pump;202, valve core;203, liquid passage. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the utility model will be apparently and completely described below in combination with the drawings of the embodiments of the utility model, and obviously, the described embodiments are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.

[0029] Various structural schematic diagrams according to the disclosed embodiments of the utility model are shown in the drawings. These drawings are not drawn according to scale, wherein certain details are amplified for the purpose of clear expression, and certain details can be omitted. The shape of various regions, layers and their relative size, positional relationship shown in the drawings are only exemplary, and there can be deviation in actuality due to manufacturing tolerance or technical limitation, and the person skilled in the art can additionally design regions / layers with different shapes, sizes, relative positions according to actual needs.

[0030] Embodiment 1:

[0031] In order to overcome the polymer blockage problem of the liquid separation tank and the liquid discharge pipeline in the prior art, the utility model provides as follows Figure 1 and Figure 2The device for discharging liquid of a new type of liquid separation tank is characterized in that a tank bottom valve is arranged at the bottom of the liquid separation tank, and a flushing pipeline is additionally arranged to flush the liquid discharge pipeline, so that continuous flushing of the liquid discharge pipeline is realized, the liquid discharge pipeline is prevented from being blocked, and the operation cycle of the device is prolonged.

[0032] The device for discharging liquid of a new type of liquid separation tank is characterized in that a tank bottom valve is arranged at the bottom of the liquid separation tank, and a flushing pipeline is additionally arranged to flush the liquid discharge pipeline, so that continuous flushing of the liquid discharge pipeline is realized, the liquid discharge pipeline is prevented from being blocked, and the operation cycle of the device is prolonged.

[0033] As Figure 1 shown, the liquid separation tank 1 is preferably an S301 liquid separation tank. Cracked gas comes from a compressor, and the cracked gas enters the liquid separation tank 1 through an inlet in the side wall of the liquid separation tank 1 and an opened YV3001 valve, and after being decomposed in the S301 liquid separation tank, the cracked gas goes upwards to a diacetylene absorption tower, and the liquid goes downwards to be discharged through the opened tank bottom valve 2 and then through a liquid discharge pipeline to a degassing tower, and a control valve is arranged on the liquid discharge pipeline.

[0034] The operation sequence of the device in use is as follows:

[0035] During the liquid discharging process, the flushing water valve 3 is closed, and the tank bottom valve 2 is opened to discharge liquid; after the liquid discharging process is completed, the tank bottom valve 2 is closed, and the flushing water valve 3 is opened to flush the remaining polymer in the liquid discharge pipeline, so that the liquid discharging operation is ensured to be normal, and a basis is provided for subsequent operation, and a large amount of polymer is prevented from being deposited in the liquid discharge pipeline.

[0036] Embodiment 2:

[0037] Based on the basis of embodiment 1, preferably, an inlet for cracked gas from the compressor is arranged on the side wall of the liquid separation tank 1; an outlet for the cracked gas leading to the diacetylene absorption tower is arranged at the top of the liquid separation tank 1; a liquid discharge port is arranged at the bottom of the liquid separation tank 1, and the liquid discharge port is discharged to the degassing tower through the tank bottom valve 2 and the liquid discharge pipeline.

[0038] Preferably, the tank bottom valve 2 is connected and fixed with the liquid separation tank 1 through a tank bottom connecting flange body.

[0039] Preferably, the tank bottom valve 2 comprises a gas pump 201, a valve core 202 and a liquid passage 203, the lower end of the valve core 202 is connected with the gas pump 201, the gas pump 201 is located directly below the through hole at the bottom of the liquid separation tank 1, and the liquid passage 203 is arranged obliquely to form an acute angle with the vertically arranged gas pump 201.

[0040] Preferably, the air supply pressure of the air pump 201 is 0.45-0.7 MPa.

[0041] In this invention, the pressure of the air pump 201 is sufficient to push the valve core 202 upward, causing the valve core 202 to move upward and open the through hole at the bottom of the tank, allowing the liquid inside the tank to be discharged quickly.

[0042] Preferably, the time from opening to closing and from closing to opening of the bottom valve 2 does not exceed 20 seconds.

[0043] Preferably, the height of the valve core 202 is 13.2 cm.

[0044] like Figure 2 As shown, in this utility model, the opening and closing of the bottom valve 2 is achieved by the air pump 201 driving the valve core 202 to move up and down. The up and down movement of the valve core 202 controls the liquid level of the S301 liquid separator 1. The high and low liquid level interlock of the liquid separator 1 still uses 75% and 30%. When draining, the valve core 202 moves upward, and the liquid in the liquid separator 1 is discharged downward. When the liquid level is below 30%, the valve core 202 falls back, and the valve core 202 fits against the bottom through hole of the liquid separator 1 and the inner wall of the flange at that location, achieving a sealing effect and closing the bottom valve 2.

[0045] In this invention, a metal spiral wound gasket is provided at the connection flange between the bottom valve 2 and the bottom of the separator 1 to ensure sealing performance during connection.

[0046] Preferably, the angle between the liquid passage 203 and the vertically arranged air pump 201 is 45°.

[0047] In this invention, the angle between the liquid passage 203 and the vertically positioned air pump 201 is such that the components do not interfere with each other when connected. This ensures accurate and rapid installation of the tank bottom valve 2.

[0048] Preferably, the liquid passage 203 is connected to the liquid discharge pipeline to the degassing tower via a flange.

[0049] Preferably, the local water network provides local water to the flushing pipeline 4, and the inflow pressure of the local water is 0.4-0.6 MPa.

[0050] like Figure 2The utility model provides a novel liquid discharging device of liquid separation tank, the liquid discharging device one aspect is based on the original pipeline, changes the valve form, replaces the cut -off valve with tank bottom valve 2, and the liquid level high -low interlock still adopts 75% and 30%, when the tank bottom valve 2 discharges, the valve element 202 moves up, and the clearance is left in the middle of equipment flange, the water in the liquid separation tank (liquid separation tank 1) is normally discharged, after the end of discharging, the valve element 202 of tank bottom valve 2 falls back, and the valve element 202 is inlaid with the tank bottom connecting flange body, reaches the sealing effect. The other aspect adds flushing water to the rear -line liquid discharging pipeline, prevents polymer deposition and blocks the pipeline, thereby causes the device to shut down. During the liquid discharging process, flushing water valve 3 is closed, prevents high -pressure gas from leaking into the local water system, and flushing water valve 3 is opened after the end of discharging, and the liquid discharging pipeline is flushed, prevents polymer deposition and blocks the pipeline, and in subsequent operation, flushing water valve 3 is always in the open state.

[0051] In the utility model, tank bottom valve 2 preferably is pneumatic cut -off valve, and the designed process condition is:

[0052] Temperature: normal 40 DEG C, maximum 45 DEG C;

[0053] Upstream pressure: 1.185MPa;

[0054] Maximum closing pressure difference: 1.185MPa;

[0055] Design pressure: 1.27MPa;

[0056] Design temperature 85 DEG C.

[0057] In the utility model, the valve body material of tank bottom valve 2 is preferably flexible graphite, and tank bottom valve 2 is all connected using flange during installation and use.

[0058] In the utility model, the protection level of tank bottom valve 2 is IP65, and the explosion -proof level is Exd IIC T4 Gb. The power supply of tank bottom valve 2 is 24VDC, and tank bottom valve 2 provided in the utility model is fireproof and static electricity.

[0059] The utility model in the specific use, from S301 process condensate cut -off, and the atmospheric pressure of local place is 92.49MPa, and the temperature is -22.3 DEG C-38.9 DEG C.

[0060] In the description of the utility model, it is necessary to explain that, unless another explicit provision and limitation, the term "installation", "connection", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication.For ordinary skilled in the art, the above terms can be understood in the utility model according to the specific meaning in the utility model.

[0061] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model.As used in the utility model specification and the appended claims, unless otherwise clear from the context, the singular forms "a", "an" and "the" are intended to include plural forms.

[0062] The above examples are only examples of the utility model and do not constitute a limitation on the scope of protection of the utility model.Any design identical or similar to the utility model falls within the scope of protection of the utility model.The device structure and method steps not described in detail in the utility model are prior art, which will not be further described in the utility model.

Claims

1. A novel device for draining liquid from a separating tank, characterized in that: The utility model relates to a kind of liquid distribution tanks, including liquid distribution tank (1), tank bottom valve (2), flushing water valve (3) and local water pipe network, the bottom center position of the liquid distribution tank (1) is opened with through-hole, the tank bottom valve (2) is installed in the through-hole and sealingly connected;The tank bottom valve (2) is connected with local water pipe network through a flushing pipeline (4) on the lower end of discharge pipeline, and flushing water valve (3) is equipped on the flushing pipeline (4).

2. The device for draining the liquid from the new type of liquid separation tank according to claim 1, characterized in that: The liquid distribution tank (1) is opened with the inlet of cracking gas from compressor on side wall;The liquid distribution tank (1) is equipped with the outlet of cracking gas to butadiyne absorption tower on top;The liquid distribution tank (1) is opened with discharge port on bottom, and the discharge port is discharged to degassing tower through tank bottom valve (2) and discharge pipeline.

3. The device for draining the liquid from the new type of liquid separation tank according to claim 2, characterized in that: The tank bottom valve (2) is connected and fixed between the liquid distribution tank (1) by tank bottom connecting flange body.

4. The device for draining the liquid from the new type of liquid separation tank according to claim 2, characterized in that: The tank bottom valve (2) includes air pump (201), valve core (202) and liquid passage (203), the lower end of valve core (202) is connected with air pump (201), air pump (201) is located just below the through-hole in the bottom of liquid distribution tank (1), and liquid passage (203) is obliquely arranged and forms acute angle between vertically arranged air pump (201).

5. The device for draining the liquid from the new type of liquid separation tank according to claim 4, characterized in that: The gas supply pressure of air pump (201) is 0.45-0.7MPa.

6. The device for draining the liquid from the new type of liquid separation tank according to claim 4, characterized in that: The tank bottom valve (2) is opened to closed and closed to opened, and it is not more than 20s.

7. The device for draining the liquid from the new type of liquid separation tank according to claim 4, characterized in that: The height of valve core (202) is 13.2cm.

8. The device for draining the liquid from the new type of liquid separation tank according to claim 4, characterized in that: The included angle between liquid passage (203) and vertically arranged air pump (201) is 45 °.

9. The device for draining the liquid from the new type of liquid separation tank according to claim 4, characterized in that: Liquid passage (203) and discharge pipeline to degassing tower are connected by flange.

10. The device for draining the liquid from the new type of liquid separation tank according to claim 1, characterized in that: Local water pipe network provides local water for flushing pipeline (4), and the water supply pressure of provided local water is 0.4-0.6MPa.

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