Safe operation protection system for long-distance liquid conveying

Abstract

A safe operation protection system for long-distance liquid conveying comprises a liquid storage tank A and a receiving storage tank B, the liquid outlet pipe is connected with the bottom of the liquid storage tank A, a liquid outlet valve A is arranged at the joint of the liquid outlet pipe and the liquid storage tank A, a conveying pump A and a conveying pump B are arranged on the liquid outlet pipe in parallel, and a liquid inlet valve B, a liquid outlet valve C, a liquid inlet valve D and a liquid outlet valve E are arranged at inlets and outlets of the conveying pump A and the conveying pump B respectively; one end of the long-distance conveying pipeline is connected with the tail end of the liquid outlet pipe, and the other end of the long-distance conveying pipeline is connected with a top receiving opening of the receiving storage tank B. The device has the advantages that the receiving storage tank B liquid level meter is interlocked with the switch valve, when the liquid level reaches the upper limit, the switch valve is automatically closed, pressure exists in the conveying pipeline, the upper limit value of the pipeline pressure transmitter is interlocked with the liquid storage tank A switch valve to be closed, and meanwhile a conveying pump is stopped, so that interlocking is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of long-distance liquid transportation, in particular to a safe operation protection system for long-distance liquid transportation. Background Art

[0002] At present, liquid media materials are often transported over long distances by pumps in chemical production plants, and most operators use walkie-talkies or mobile phones to start and stop equipment. In the event of an emergency, improper operation may cause accidents, posing a great safety risk and risk to the safe operation of equipment. Utility Model Content

[0003] The purpose of this utility model is to provide a safe operation protection system for long-distance liquid transportation in view of the above-mentioned shortcomings.

[0004] The utility model includes a liquid storage tank A and a receiving storage tank B. The tops of the liquid storage tank A and the receiving storage tank B are both provided with radar level gauges and safety pressure relief manholes, and the bottom side walls of the liquid storage tank A and the receiving storage tank B are both provided with drain ports.

[0005] A liquid outlet pipe is connected to the bottom of the liquid storage tank A. A liquid outlet valve A is provided at the connection between the liquid outlet pipe and the liquid storage tank A. A delivery pump A and a delivery pump B are provided in parallel on the liquid outlet pipe. The inlet and outlet of the delivery pump A and the delivery pump B are respectively provided with a liquid inlet valve B and a liquid outlet valve C, as well as a liquid inlet valve D and a liquid outlet valve E;

[0006] A long-distance transmission pipeline, one end of which is connected to the end of the liquid outlet pipe and the other end is connected to the top receiving port of the receiving tank B.

[0007] Preferably, a field pressure gauge A, a check valve, an electric or pneumatic switch valve A and a pressure transmitter are sequentially provided on the pipeline close to the liquid outlet pipe on the long-distance transmission pipeline.

[0008] Preferably, a field pressure gauge B and an electric or pneumatic switch valve B are sequentially provided on the pipeline near the receiving port on the top of the receiving storage tank B on the long-distance transmission pipeline.

[0009] Preferably, the pressure transmitter is interlocked with the electric or pneumatic switch valve A, delivery pump A and delivery pump B by setting upper and lower limits. When the pressure reaches the upper limit, the electric or pneumatic switch valve A is automatically closed, and the delivery pump A and delivery pump B are stopped at the same time; when the pressure reaches the lower limit, the electric or pneumatic switch valve A is opened, and the delivery pump A and delivery pump B can be operated.

[0010] Preferably, the electric or pneumatic switch valve B is opened or closed by interlocking with the upper and lower limit values ​​set by the radar level gauge on the top of the receiving tank B.

[0011] Preferably, the lower side walls of the liquid storage tank A and the receiving storage tank B are both provided with inspection manholes.

[0012] Preferably, the bottom of the receiving tank B is provided with a reserved interface for transporting liquid to the production device.

[0013] The advantages of this utility model are: by interlocking the liquid level gauge of receiving tank B with the on-off valve, when the liquid level reaches the upper limit, the on-off valve automatically closes, and pressure exists in the delivery pipeline. The upper limit value of the pipeline pressure transmitter is interlocked with the on-off valve of liquid storage tank A and closed, and the delivery pump is stopped at the same time to achieve interlocking; when the liquid level falls below the upper limit, the on-off valve automatically opens, the pressure in the delivery pipeline drops, and when the pressure reaches the set lower limit, the delivery device of liquid storage tank A starts the delivery pump according to the normal procedure (opening the manual valve to restore the check valve function, which can also be remotely controlled by DCS). Otherwise, if the liquid level of the receiving tank exceeds the upper limit and the pressure in the pipeline exceeds the upper limit, the pneumatic or electric valve interlock actuates and closes, and the equipment cannot be started. This eliminates safety risks such as flooding and pipeline overpressure caused by improper operation, and ensures the safety of long-distance liquid transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0015] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0017] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the utility model is usually placed when in use. This is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, if the terms "first", "second", etc. appear in the description of the present invention, they are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0018] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0019] As shown in the accompanying drawings, the present invention includes a liquid storage tank A1 and a receiving storage tank B11. The tops of the liquid storage tank A1 and the receiving storage tank B11 are both provided with a radar level gauge 5 and a safety pressure relief manhole 3. The bottom side walls of the liquid storage tank A1 and the receiving storage tank B11 are both provided with a drain port 14.

[0020] The liquid outlet pipe 2 is connected to the bottom of the liquid storage tank A1. A liquid outlet valve A is provided at the connection between the liquid outlet pipe 2 and the liquid storage tank A1. A delivery pump A6 and a delivery pump B7 are provided in parallel on the liquid outlet pipe 2. The inlet and outlet of the delivery pump A6 and the delivery pump B7 are respectively provided with a liquid inlet valve B8 and a liquid outlet valve C9, as well as a liquid inlet valve D10 and a liquid outlet valve E12; the throttling medium delivery facilitates the switching and maintenance of the delivery pump A6 and the delivery pump B7;

[0021] One end of the long-distance delivery pipeline 13 is connected to the end of the liquid outlet pipe 2, and the other end is connected to the top receiving port of the receiving storage tank B11.

[0022] In another technical solution, a field pressure gauge A15, a check valve 16, an electric or pneumatic on / off valve A17, and a pressure transmitter 18 are installed in sequence on the long-distance transmission pipeline 13 near the liquid outlet pipe 2. Field pressure gauge A15 monitors the pipeline medium pressure for on-site inspections. Check valve 16 prevents backflow of the pipeline medium and damage to equipment.

[0023] In another technical solution, a field pressure gauge B21 and an electric or pneumatic switch valve B22 are sequentially provided on the pipeline of the long-distance transmission pipeline 13 near the receiving port at the top of the receiving storage tank B11.

[0024] In another technical solution, pressure transmitter 18 operates interlocked with electric or pneumatic valve A17, pumps A6, and B7 by setting upper and lower limits. When pressure reaches the upper limit, valve A17 automatically closes, simultaneously stopping pumps A6 and B7. When pressure reaches the lower limit, valve A17 opens, and pumps A6 and B7 begin operating. The pressure transmitter controls the electric or pneumatic valve by converting the measured pressure into a standard electrical signal. The operating principle of a pressure transmitter is to convert the weak, non-electrical pressure variable detected by the sensor into a transmittable, standardized signal output, such as a 4-20 mA DC current signal. These signals are compared with the set value in the control system. When the difference between the two reaches a certain value, the control system sends an adjustment signal to the electric or pneumatic valve. Based on this signal, the actuator of the electric or pneumatic valve causes the valve stem to move the valve core, thereby changing the flow rate through the control valve until the pressure at the test point reaches the required value, thus achieving automatic pressure control. Pressure transmitters not only monitor and control pressure but also control the start and stop of pumps by controlling the output signal. Install a pressure switch on the output port of the pressure transmitter and connect it to the circuit controlling the pump. When the pump's operating pressure reaches a specified value, the pressure switch triggers, transmitting a signal to the pump's switching circuit, thereby stopping the pump. When the pressure drops to a certain level, the pressure switch's signal is transmitted back to the control circuit, restarting the pump. In this way, the pressure transmitter can automatically control the start and stop of the pump.

[0025] In another technical solution, the opening and closing of the electric or pneumatic on-off valve B22 is controlled by interlocking with the upper and lower limits set by the radar level gauge 5 atop the receiving tank B11. The radar level gauge is integrated with a programmable logic controller (PLC) or other control system. When the liquid level reaches the preset upper and lower limits, the PLC or other control system uses these signals to issue commands to open or close the electric or pneumatic on-off valve B, thereby achieving automatic liquid level control.

[0026] In another technical solution, a maintenance manhole 19 is provided on the lower side walls of the liquid storage tank A1 and the receiving storage tank B11.

[0027] In another technical solution, a reserved interface 23 for transporting liquid to the production device is provided at the bottom of the receiving storage tank B11.

[0028] Working method: Safety pressure relief manhole 3 achieves gaseous pressure balance between liquid storage tank A1 and receiving tank B11, ensuring that the gaseous phases in liquid storage tank A1 and receiving tank B11 cannot experience positive or negative pressure. The radar level gauge in receiving tank B11 is interlocked with electric or pneumatic switch valve B22. When the liquid level reaches the upper limit, electric or pneumatic switch valve B22 automatically closes, and pressure is generated in long-distance transmission pipeline 13. The upper limit value of pressure transmitter 18 is interlocked with electric or pneumatic switch valve A17 in liquid storage tank A1, closing the valve and simultaneously stopping delivery pumps A6 and B7, achieving an automatic interlock. When the liquid level falls below the upper limit, electric or pneumatic switch valve A17 automatically opens, eliminating pressure in long-distance transmission pipeline 13. Liquid storage tank A1 then starts delivery pumps A6 and B7 according to normal procedures (both delivery pumps can be connected to the power supply simultaneously or one at a time, depending on actual needs). Otherwise, the interlock device activates, and the equipment cannot be started. Eliminate safety risks such as flooding and pipeline overpressure caused by improper operation, and ensure the safety of long-distance liquid transportation.

[0029] The above implementation cases are only for illustrating the technical solutions and features of the utility model, and their purpose is to enable people familiar with the technology to implement them better. They cannot be used to limit the scope of protection of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model are within the scope of protection of the utility model. Those not described in detail are prior art.

Claims

1. A safe operation protection system for long-distance liquid transportation, characterized in that: include The liquid storage tank A (1) and the receiving storage tank B (11) are provided with a radar level gauge (5) and a safety pressure relief manhole (3) on the top of each of the liquid storage tank A (1) and the receiving storage tank B (11), and a drain port (14) is provided on the bottom side wall of each of the liquid storage tank A (1) and the receiving storage tank B (11); A liquid outlet pipe (2) is connected to the bottom of the liquid storage tank A (1), a liquid outlet valve A (4) is provided at the connection between the liquid outlet pipe (2) and the liquid storage tank A (1), a delivery pump A (6) and a delivery pump B (7) are provided in parallel on the liquid outlet pipe (2), and a liquid inlet valve B (8) and a liquid outlet valve C (9) as well as a liquid inlet valve D (10) and a liquid outlet valve E (12) are provided at the inlet and outlet of the delivery pump A (6) and the delivery pump B (7), respectively; A long-distance delivery pipeline (13) has one end connected to the end of the liquid outlet pipe (2) and the other end connected to the top receiving port of the receiving storage tank B (11).

2. A safe operation protection system for long-distance liquid transportation according to claim 1, characterized in that: On the long-distance delivery pipeline (13) and near the liquid outlet pipe (2), a field pressure gauge A (15), a check valve (16), an electric or pneumatic switch valve A (17) and a pressure transmitter (18) are sequentially provided.

3. A safe operation protection system for long-distance liquid transportation according to claim 2, characterized in that: On the long-distance transmission pipeline (13), a pipeline close to the receiving port on the top of the receiving storage tank B (11) is provided with an on-site pressure gauge B (21) and an electric or pneumatic switch valve B (22) in sequence.

4. A safe operation protection system for long-distance liquid transportation according to claim 3, characterized in that: The pressure transmitter (18) is interlocked with the electric or pneumatic switch valve A (17), the delivery pump A (6) and the delivery pump B (7) by setting the upper and lower limit values. When the pressure reaches the upper limit, the electric or pneumatic switch valve A (17) is automatically closed, and the delivery pump A (6) and the delivery pump B (7) are stopped at the same time; when the pressure reaches the lower limit, the electric or pneumatic switch valve A (17) is opened, and the delivery pump A (6) and the delivery pump B (7) can be operated.

5. A safe operation protection system for long-distance liquid transportation according to claim 4, characterized in that: The electric or pneumatic switch valve B (22) is opened or closed by interlocking with the upper and lower limit values ​​set by the radar level meter (5) on the top of the receiving storage tank B (11).

6. A safe operation protection system for long-distance liquid transportation according to claim 1, characterized in that: The lower side walls of the liquid storage tank A (1) and the receiving storage tank B (11) are both provided with inspection manholes (19).

7. A safe operation protection system for long-distance liquid transportation according to claim 1, characterized in that: The bottom of the receiving tank B (11) is provided with a reserved interface (23) for transporting liquid to the production device.

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