CN221035254U

CN221035254U - High-risk pump dry gas sealing redundant protection system of chemical device

Info

Publication number: CN221035254U
Application number: CN202322606787.3U
Authority: CN
Inventors: 徐舰波; 赵鲁强
Original assignee: Lihuayi Lijin Refining and Chemical Co Ltd
Current assignee: Lihuayi Lijin Refining and Chemical Co Ltd
Priority date: 2023-09-26
Filing date: 2023-09-26
Publication date: 2024-05-28
Anticipated expiration: 2033-09-26

Abstract

The utility model relates to the technical field of electric machinery, in particular to a high-risk dry gas sealing redundant protection system of a chemical device. The root valve, the filter, the pressure stabilizing pump, the one-way valve, the nitrogen buffer tank, the cut-off valve and the pressure control regulating valve are connected in series through pipelines; the tail ends after being connected in series are connected into each high-risk pump dry gas sealing system, and the front ends of root valves are connected into a nitrogen pipe network; the nitrogen pipe net is provided with a first pressure sensor, the nitrogen buffer valve is provided with a second pressure sensor, and the rear end of the pressure regulating valve is provided with a third pressure sensor; the instrument control system is connected with the first pressure sensor, the second pressure sensor and the third pressure sensor; the pressure stabilizing valve, the nitrogen buffer tank and the pressure control regulating valve are connected to the instrument control system. When the pressure of the factory nitrogen pipe network fluctuates, the factory nitrogen pipe network is timely switched to a redundant machine pump sealing nitrogen pipeline, and the output pressure of the buffer tank is controlled through the regulating valve, so that the machine pump safety is ensured, and the safety accident caused by medium leakage is avoided.

Description

High-risk pump dry gas sealing redundant protection system of chemical device

Technical Field

The utility model relates to the technical field of electric machinery, in particular to a high-risk dry gas sealing redundant protection system of a chemical device.

Background

The pump sealing of the poisonous, harmful, inflammable and explosive medium machine on the existing device adopts a dry gas sealing system, and the sealing protection gas of the system adopts factory nitrogen. When the pressure of the nitrogen pipe network fluctuates, the sealing gas cannot play a role in protecting the pump, so that toxic and harmful combustible and explosive media leak to cause device parking and safety accidents.

Disclosure of utility model

The utility model provides a high-risk dry gas sealing redundant protection system for a chemical device, which aims to timely switch to a redundant pump sealing nitrogen pipeline when the pressure of a factory nitrogen pipe network fluctuates, ensure the safety of a pump and the long-period operation of the device, and avoid the shutdown or other safety accidents of the device caused by medium leakage.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

The utility model provides a high-risk pump dry gas sealing redundant protection system of a chemical device, which is characterized in that a root valve, a filter, a pressure stabilizing pump, a one-way valve, a nitrogen buffer tank, a cut-off valve and a pressure control regulating valve are connected in series through pipelines;

The tail ends after being connected in series are connected into each high-risk pump dry gas sealing system, and the front ends of root valves are connected into a nitrogen pipe network; the nitrogen pipe net is provided with a first pressure sensor, the nitrogen buffer valve is provided with a second pressure sensor, and the rear end of the pressure regulating valve is provided with a third pressure sensor;

The instrument control system is connected with the first pressure sensor, the second pressure sensor and the third pressure sensor;

the pressure stabilizing valve, the nitrogen buffer tank and the pressure control regulating valve are connected to the instrument control system.

In an embodiment, the instrument control system is a DCS control system or a PLC control system.

The beneficial effects achieved by the utility model are as follows:

the improved sealing protection system adopts a DCS control system to receive pressure signals from a nitrogen pipeline network pressure sensor, automatically controls a secondary pressure stabilizing pump and stabilizes the pressure of a dry gas sealing buffer tank. When the pressure of the factory nitrogen pipe network fluctuates, the factory nitrogen pipe network is timely switched to a redundant machine pump sealing nitrogen pipeline, and the output pressure of the buffer tank is controlled through the regulating valve, so that the machine pump safety is ensured, and the safety accident caused by medium leakage is avoided.

Before the system is adopted, the sealing system of the pump is not effectively protected under the influence of the pressure of the nitrogen pipe network, the sealing of the pump is often damaged due to the pressure fluctuation of the nitrogen pipe network, and the sealing has long supply period, high maintenance cost and long replacement working time. Because the pump is an important station device of the device, the device is stopped for a plurality of times and cannot be operated for a long period with low cost. After the sealing protection system technology is improved, the influence of pressure fluctuation of a nitrogen pipe network on equipment is avoided, and the service life of a pump is effectively prolonged. Greatly saves equipment maintenance cost and ensures the stable operation of the device.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a high-risk pump dry gas seal redundancy protection system structure of a chemical plant;

In the figure: 1. a DCS control system; 2. a gas pressure stabilizing pump; 3. a shut-off valve; 4. a nitrogen buffer tank; 5. a one-way valve; 6. a filter; 7. a pressure-controlled regulating valve; 8. a first pressure sensor; 9. a second pressure sensor; 10. a third pressure sensor; 11. root valve.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

As shown in fig. 1, the root valve 11, the filter 6, the pressure stabilizing pump, the check valve 5, the nitrogen buffer tank 4, the shut-off valve 3, and the pressure control valve 7 are connected in series by pipes.

The tail ends after being connected in series are connected into each high-risk pump dry gas sealing system and are provided with stop valves, the front ends of root valves 11 are connected into a nitrogen pipe network, and the root valves 11 are stop valves. The instrument control system is connected with a first pressure sensor 8, a second pressure sensor 9 and a third pressure sensor 10; factory nitrogen passes through a filter 6 from a pipe network to the gas pressure stabilizing pump 2, pressurized nitrogen enters the nitrogen buffer tank 4 through the one-way valve 5, the outlet gas of the nitrogen buffer tank 4 is controlled by a pressure signal received from a pressure sensor of the nitrogen pipe network through the DCS control system 1, and when the pressure fluctuates, the DCS control system 1 sends out an instruction to open an outlet electromagnetic valve of the buffer tank and switch to a redundant sealing nitrogen pipeline. The DCS control system 1 controls the opening of the regulating valve according to the outlet pressure of the buffer tank, so as to ensure the sealing air pressure.

The nitrogen pipe net is provided with a first pressure sensor 8, the nitrogen buffer valve is provided with a second pressure sensor 9, and the rear end of the pressure regulating valve is provided with a third pressure sensor 10; the pressure stabilizing valve, the nitrogen buffer tank 4 and the pressure control regulating valve 7 are connected to an instrument control system. The instrument control system is a DCS control system or a PLC control system.

The nitrogen pipe network of the factory is provided with a first pressure sensor 8, when the pressure of the pipe network is less than 1.3Mpa, an alarm signal is sent to the DCS control system 1, when the DCS control system 1 detects that the pressure is less than or equal to 1Mpa, the DCS control system 1 starts the DCS interlocking to open the downstream cut-off valve 3 of the nitrogen buffer tank 4, and nitrogen in the buffer tank enters the dry gas sealing protection system. The pressure control regulating valve 7 and the pressure sensor III 10 realize automatic control to keep the pressure of the dry gas seal protection system at about 1.3Mpa so as to provide nitrogen seal for the dry gas seal system. The DCS control system 1 detects the pressure of the nitrogen buffer tank 4 through the pressure sensor II 9, and when the pressure of the buffer tank is smaller than 1.5Mpa, the pressure stabilizing pump is started until the pressure of the buffer tank reaches 1.5Mpa, and the pump is stopped to ensure the normal operation of the nitrogen system.

The working process of the whole system is summarized as follows:

1. factory nitrogen enters the gas pressure stabilizing pump 2 through the filter 6 to be pressurized.

2. The nitrogen pressurized by the pressure stabilizing pump enters the nitrogen buffer tank 4 through the one-way valve 5.

3. The gas at the outlet of the nitrogen buffer tank 4 is controlled by a feedback signal of a pressure sensor through a meter control system (DCS control system 1 or a PLC control system). When the pressure of the outlet of the buffer tank fluctuates, the meter control system can send out an instruction to open the electromagnetic valve of the outlet of the buffer tank and switch to the redundant sealing nitrogen pipeline so as to ensure the air pressure to be stable.

4. The instrument control system controls the opening of the pressure-controlled regulating valve 7 according to the outlet pressure of the buffer tank so as to maintain the pressure of the dry gas sealing system.

5. A first pressure sensor 8 is arranged on a nitrogen pipe network of a factory, and when the pressure of the pipe network is lower than 1.3Mpa, the first pressure sensor can send an alarm signal to the DCS control system 1. When the DCS control system 1 detects that the pressure is lower than or equal to 1Mpa, the DCS control system can start the DCS to open the cut-off valve 3 at the downstream of the nitrogen buffer tank 4 in an interlocking mode, so that nitrogen in the buffer tank enters the dry gas seal protection system.

6. The pressure control regulating valve 7 and the pressure sensor III 10 realize automatic control so as to keep the pressure of the dry gas sealing protection system around 1.3Mpa and provide nitrogen sealing for the dry gas sealing system.

The dcs control system monitors the pressure of the nitrogen buffer tank 4 via pressure sensor two 9. When the pressure of the buffer tank is lower than 1.5Mpa, the system starts the pressure stabilizing pump until the pressure of the buffer tank reaches 1.5Mpa, and the pump is stopped, so that the normal operation of the nitrogen system is ensured.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. Chemical plant device high-risk pump dry gas seals redundant protection system, its characterized in that: the root valve (11), the filter (6), the pressure stabilizing pump, the one-way valve (5), the nitrogen buffer tank (4), the cut-off valve (3) and the pressure control regulating valve (7) are connected in series through pipelines;

The tail ends after being connected in series are connected into each high-risk pump dry gas sealing system, and the front ends of root valves (11) are connected into a nitrogen pipe network;

The nitrogen pipe network is provided with a first pressure sensor (8), the nitrogen buffer valve is provided with a second pressure sensor (9), and the rear end of the pressure regulating valve is provided with a third pressure sensor (10);

The instrument control system is connected with a first pressure sensor (8), a second pressure sensor (9) and a third pressure sensor (10);

The pressure stabilizing valve, the nitrogen buffer tank (4) and the pressure control regulating valve (7) are connected to the instrument control system.

2. The chemical plant device high-risk pump dry gas seal redundancy protection system according to claim 1, wherein: the instrument control system is a DCS control system (1) or a PLC control system.