Nitrogen circulating protection tank group

Abstract

The utility model belongs to inert medium conveying equipment technical field, especially a kind of nitrogen circulation protection tank group, including circulating tank, supplementary tank, the air inlet end of supplementary tank is connected with outside nitrogen source by first valve, the air outlet end of supplementary tank is connected with circulating tank by second valve, circulating tank is provided with the circulating air outlet end that the air inlet end of outside nitrogen circulation pipeline is connected by third valve and the circulating back gas end that the air outlet end of outside nitrogen circulation pipeline is connected by fourth valve, circulating tank is provided with oxygen detector, dust detector and pressure detector.The utility model uses supplementary tank to supplement nitrogen for circulating tank, so that circulating tank and outside nitrogen circulation pipeline maintain stable nitrogen flow, and oxygen detector, dust detector and pressure detector detect oxygen content, dust content and air pressure size in circulating tank respectively, to be able to timely control the situation in circulating tank and nitrogen circulation pipeline.

Description

Technical fields:

[0001] This utility model belongs to the technical field of inert medium conveying equipment, and specifically refers to a nitrogen circulation protection tank group. Background technology:

[0002] In industries such as chemicals, pharmaceuticals, and new energy materials, it is often necessary to transport powdered hazardous materials such as metal powders, flammable chemicals, and pharmaceutical intermediates. These materials are prone to oxidation, combustion, and even explosion when exposed to air, posing serious safety hazards. Therefore, the industry currently widely uses nitrogen-protected transport technology to replace air, using an inert gas to isolate oxygen. However, existing technologies have the following key drawbacks: nitrogen consumption is enormous; most nitrogen-protected transport technologies use a single-use nitrogen transport method with direct end-of-pipe discharge, while industrial-grade high-purity nitrogen is expensive and wasteful. Furthermore, even if some nitrogen-protected transport technologies establish gas recovery channels at the end, the recovered nitrogen can still mix with residual oxygen and hazardous powdered materials in the pipeline. The lack of necessary monitoring mechanisms means that after multiple recycling cycles, the recycled nitrogen will inevitably have a high risk of exceeding oxygen content limits and the accumulation of hazardous powdered materials. Summary of the Invention:

[0003] The purpose of this utility model is to provide a nitrogen circulation protection tank group, in which the circulation tank is connected to both ends of the nitrogen circulation pipeline. A replenishment tank is used to replenish nitrogen in the circulation tank, so that the circulation tank and the external nitrogen circulation pipeline maintain a stable flow of nitrogen. Furthermore, the oxygen content, dust content and pressure of the circulation tank are detected by oxygen detector, dust detector and pressure detector on the circulation tank, so as to monitor the situation in the circulation tank and the external nitrogen circulation pipeline in a timely manner.

[0004] This utility model is implemented as follows:

[0005] A nitrogen circulation protection tank assembly includes a circulation tank and a replenishment tank with a pressure higher than that in the circulation tank. The inlet of the replenishment tank is connected to an external nitrogen source through a first valve, and the outlet of the replenishment tank is connected to the circulation tank through a second valve. The circulation tank is provided with a circulation outlet connected to the inlet of an external nitrogen circulation pipeline through a third valve, and a circulation return end connected to the outlet of an external nitrogen circulation pipeline through a fourth valve. The circulation tank is provided with an oxygen detector for detecting the oxygen content in the circulation tank, a dust detector for detecting the dust content in the circulation tank, and a pressure detector for detecting the pressure in the circulation tank.

[0006] In the aforementioned nitrogen circulation protection tank group, both the circulation tank and the replenishment tank are equipped with pressure relief safety valves that are connected to the outside atmosphere.

[0007] In the aforementioned nitrogen circulation protection tank group, pressure gauges for displaying the pressure inside the corresponding tank are provided on the outer wall surfaces of both the circulation tank and the replenishment tank.

[0008] In the aforementioned nitrogen circulation protection tank assembly, the inner port of the fourth valve is connected to the circulation return end of the circulation tank, the outer port of the fourth valve is connected to the first port of the three-way ventilation pipe, the second port of the three-way ventilation pipe is connected to the outlet end of the external nitrogen circulation pipe, and the third port of the three-way ventilation pipe is connected to the external atmosphere through the fifth valve.

[0009] In the aforementioned nitrogen circulation protection tank group, the first valve is a pressure regulating valve, the second valve is a pressure reducing valve, and the third, fourth, and fifth valves are all pneumatic butterfly valves. The pneumatic actuator of the pneumatic butterfly valve is electrically connected to the control assembly, and the control assembly controls the opening or closing of the corresponding valve according to the signal from the oxygen detector, dust detector, or pressure detector.

[0010] In the aforementioned nitrogen circulation protection tank assembly, a cleaning port communicating with the inner cavity of the circulation tank is provided on the outer wall surface of the circulation tank, and the cleaning port sealing cover is equipped with a cleaning sealing cover.

[0011] In the aforementioned nitrogen circulation protection tank group, both the circulation tank and the replenishment tank are provided with a discharge port at the bottom that communicates with the outside. The discharge port is equipped with a manual butterfly valve that can open or close the discharge port.

[0012] The outstanding advantages of this utility model compared to the prior art are:

[0013] This invention connects the circulation tank to both ends of the nitrogen circulation pipeline and uses a replenishment tank to replenish nitrogen in the circulation tank, so that the circulation tank and the external nitrogen circulation pipeline maintain a stable flow of nitrogen. Furthermore, the oxygen detector, dust detector and pressure detector on the circulation tank are used to detect the oxygen content, dust content and gas pressure in the circulation tank, so as to monitor the situation in the circulation tank and the external nitrogen circulation pipeline in a timely manner. Attached image description:

[0014] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0015] In the diagram: 1. Circulation tank; 2. Replenishment tank; 3. First valve; 4. Second valve; 5. Third valve; 6. Fourth valve; 7. Oxygen detector; 8. Dust detector; 9. Pressure detector; 10. Pressure relief safety valve; 11. Pressure gauge; 12. Three-way ventilation pipe; 13. Fifth valve; 14. Cleaning seal cover; 15. Manual butterfly valve. Detailed implementation method:

[0016] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 :

[0017] A nitrogen circulation protection tank assembly includes a circulation tank 1 and a replenishment tank 2 with an internal pressure higher than that of the circulation tank 1. The inlet of the replenishment tank 2 is connected to an external nitrogen source through a first valve 3, and the outlet of the replenishment tank 2 is connected to the circulation tank 1 through a second valve 4. The circulation tank 1 is provided with a circulation outlet connected to the inlet of an external nitrogen circulation pipeline through a third valve 5, and a circulation return end connected to the outlet of an external nitrogen circulation pipeline through a fourth valve 6. The circulation tank 1 is provided with an oxygen detector 7 for detecting the oxygen content inside the circulation tank 1, a dust detector 8 for detecting the dust content inside the circulation tank 1, and a pressure detector 9 for detecting the internal pressure of the circulation tank 1.

[0018] This invention connects the circulation tank 1 to both ends of the nitrogen circulation pipeline and uses the replenishment tank 2 to replenish nitrogen in the circulation tank 1, so that the circulation tank 1 and the external nitrogen circulation pipeline maintain a stable flow of nitrogen. Furthermore, the oxygen detector 7, dust detector 8 and pressure detector 9 on the circulation tank 1 are used to detect the oxygen content, dust content and pressure in the circulation tank 1, so as to keep abreast of the situation in the circulation tank 1 and the external nitrogen circulation pipeline.

[0019] In this embodiment, the pressure inside the circulation tank 1 is atmospheric pressure, consistent with the outside atmosphere, while the pressure inside the replenishment tank 2 can be slightly higher than that inside the circulation tank 1. Considering that failure of the first valve 3 or the second valve 4 could lead to an abnormal rise in pressure inside the replenishment tank or circulation tank 1, both the circulation tank 1 and the replenishment tank 2 are equipped with pressure relief safety valves 10 that are connected to the outside atmosphere. That is, the pressure relief safety valves 10 can release excess nitrogen gas when the pressure inside the corresponding tank rises to a predetermined threshold. Furthermore, to facilitate direct monitoring of the tank pressure by personnel, pressure gauges 11 for displaying the pressure inside the corresponding tank are installed on the outer walls of both the circulation tank 1 and the replenishment tank 2.

[0020] When the oxygen content in the nitrogen is too high, in order to vent the nitrogen in the circulation tank 1 and the nitrogen circulation pipeline and replace it with high-purity nitrogen, the inner port of the fourth valve 6 is connected to the circulation return end of the circulation tank 1, the outer port of the fourth valve 6 is connected to the first port of the three-way ventilation pipe 12, the second port of the three-way ventilation pipe 12 is connected to the outlet end of the external nitrogen circulation pipeline, and the third port of the three-way ventilation pipe 12 is connected to the external atmosphere through the fifth valve 13. When the oxygen content in the nitrogen is too high, the fourth valve 6 is closed to block the return end of the circulation tank 1 from the three-way ventilation pipe 12, and the fifth valve 13 is opened to connect the three-way ventilation pipe 12 to the outside. The negative pressure source in the external nitrogen circulation pipe serves as a power source to extract the nitrogen negative pressure from the circulation tank 1 and the nitrogen circulation pipe, and send it to the outside through the three-way ventilation pipe 12. At this time, the second valve 4 is set to the closed state. When the nitrogen negative pressure in the circulation tank 1 and the external nitrogen circulation pipe is extracted to a predetermined state, the fifth valve 13 is closed, the fourth valve 6 and the second valve 4 are opened, and the replenishment tank 2 replenishes the nitrogen in the circulation tank 1 and the external nitrogen circulation pipe. Furthermore, the degree of nitrogen extraction can be manually determined.

[0021] In order to achieve automated control design, in this embodiment, the first valve 3 is a pneumatic pressure regulating valve, the second valve 4 is a pressure reducing valve, and the third valve 5, the fourth valve 6 and the fifth valve 13 are all pneumatic butterfly valves. The pneumatic actuator of the pneumatic butterfly valve is electrically connected to the control assembly. The control assembly controls the opening or closing of the corresponding valve according to the signal of the oxygen detector 7, the dust detector 8 or the pressure detector 9.

[0022] Furthermore, when the dust detector 8 detects excessive dust content, in order to clean the dust deposited in the circulation tank 1 while the system is shut down, a cleaning port communicating with the inner cavity of the circulation tank 1 is provided on the outer wall of the circulation tank 1, and the cleaning port is sealed with a cleaning sealing cap 14. Simultaneously, both the circulation tank 1 and the replenishment tank 2 are provided with discharge ports at their bottoms, communicating with the outside. Manual butterfly valves 15 are installed on these discharge ports to allow for opening or closing. These discharge ports can be used to quickly discharge dust or other debris deposited at the bottom of the tank.

[0023] It should be noted that the oxygen detector 7, dust detector 8 and pressure detector 9 mentioned above can all be directly from commercially available testing instruments.

[0024] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A nitrogen circulation protection tank assembly, characterized in that: It includes a circulation tank (1) and a supplementary tank (2) with a gas pressure higher than that in the circulation tank (1). The inlet of the supplementary tank (2) is connected to an external nitrogen source through a first valve (3), and the outlet of the supplementary tank (2) is connected to the circulation tank (1) through a second valve (4). The circulation tank (1) is provided with a circulation outlet connected to the inlet of an external nitrogen circulation pipeline through a third valve (5) and a circulation return end connected to the outlet of an external nitrogen circulation pipeline through a fourth valve (6). The circulation tank (1) is provided with an oxygen detector (7) for detecting the oxygen content in the circulation tank (1), a dust detector (8) for detecting the dust content in the circulation tank (1), and a pressure detector (9) for detecting the gas pressure in the circulation tank (1).

2. The nitrogen circulation protection tank group according to claim 1, characterized in that: Both the circulation tank (1) and the replenishment tank (2) are equipped with pressure relief safety valves (10) that are connected to the outside atmosphere.

3. A nitrogen circulation protection tank assembly according to claim 1, characterized in that: Pressure gauges (11) for displaying the pressure inside the corresponding tank are provided on the outer wall surfaces of both the circulation tank (1) and the replenishment tank (2).

4. A nitrogen circulation protection tank assembly according to claim 1, characterized in that: The inner port of the fourth valve (6) is connected to the circulation return end of the circulation tank (1), the outer port of the fourth valve (6) is connected to the first port of the three-way ventilation pipe (12), the second port of the three-way ventilation pipe (12) is connected to the outlet end of the external nitrogen circulation pipe, and the third port of the three-way ventilation pipe (12) is connected to the external atmosphere through the fifth valve (13).

5. A nitrogen circulation protection tank assembly according to claim 4, characterized in that: The first valve (3) is a pneumatic pressure regulating valve, the second valve (4) is a pressure reducing valve, and the third valve (5), the fourth valve (6) and the fifth valve (13) are all pneumatic butterfly valves. The pneumatic actuator of the pneumatic butterfly valve is electrically connected to the control assembly. The control assembly controls the opening or closing of the corresponding valve according to the signal from the oxygen detector (7), the dust detector (8) or the pressure detector (9).

6. A nitrogen circulation protection tank assembly according to claim 1, characterized in that: The outer wall of the circulation tank (1) is provided with a cleaning port that communicates with the inner cavity of the circulation tank (1), and the cleaning port is covered with a cleaning sealing cover (14).

7. A nitrogen circulation protection tank assembly according to claim 1, characterized in that: The bottom of both the circulation tank (1) and the replenishment tank (2) is provided with a discharge port that communicates with the outside world, and a manual butterfly valve (15) that can open or close the discharge port is provided on the discharge port.

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