Nitrogen supply device for ultrapure water nitrogen-sealed water tank

Abstract

The utility model discloses a nitrogen supply device for an ultrapure water nitrogen-sealed water tank, which comprises a nitrogen supply unit comprising a nitrogen source and a nitrogen conveying header pipe, and a pressure reducing valve and a nitrogen supply valve are mounted on the nitrogen conveying header pipe; the plurality of nitrogen-sealed water tanks are connected to a nitrogen conveying header pipe through nitrogen conveying branch pipes; the nitrogen backflow unit comprises a backflow pipeline and a gas pressure sensor mounted in the backflow pipeline; wherein each nitrogen-sealed water tank is connected with a corresponding backflow branch pipe, a plurality of backflow branch pipes are connected to a backflow main pipe, and the backflow main pipe is communicated into a nitrogen conveying main pipe between a pressure reducing valve and a nitrogen supply valve; the water seal unit is connected with each nitrogen seal water tank; the PLC control unit is connected with the nitrogen supply valve and the gas pressure sensor; wherein the PLC control unit presets a data table that different air pressures correspond to different nitrogen supply valve opening degrees. An independent breather valve and an independent nitrogen discharge valve on each nitrogen-sealed water tank are omitted, and a concentrated nitrogen supply and backflow system is adopted, so that the number of equipment is remarkably reduced, and the problems of equipment redundancy and high cost in a traditional system are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ultrapure water preparation, and particularly relates to an ultrapure water nitrogen sealing water tank nitrogen supply device. BACKGROUND

[0002] In a large ultrapure water system, a nitrogen sealing water tank is used to store ultrapure water, and nitrogen sealing technology is used to prevent the water quality from being polluted by impurities such as oxygen and carbon dioxide in the air. Figure 1 As shown in FIG. 1, a conventional nitrogen sealing system usually sets an independent pressure reducing valve, a nitrogen supply valve, a breather valve and a nitrogen release valve on each nitrogen sealing water tank to ensure that a micro-positive pressure state is maintained in the storage tank. The specific working process is as follows: nitrogen gas supply: nitrogen gas is reduced to 0.2-0.8 MPa by the pressure reducing valve and enters the nitrogen supply valve. Pressure regulation: when the pressure in the tank increases (such as material feeding or liquid level rising) and exceeds the set value of the nitrogen supply valve, the nitrogen supply valve is closed. Pressure relief operation: when the pressure reaches the set value of the nitrogen release valve, the nitrogen release valve is opened to quickly release the excess pressure. Nitrogen supplement operation: when the pressure in the tank decreases, the nitrogen release valve is closed and the nitrogen supply valve is opened to inject nitrogen gas into the tank to maintain a micro-positive pressure state. Water seal protection: each nitrogen sealing water tank is equipped with a water seal bucket to prevent nitrogen gas leakage.

[0003] The conventional nitrogen sealing system has the following problems: 1. Equipment redundancy and high cost: each nitrogen sealing water tank needs to be equipped with independent valves and control units, resulting in a large number of equipment and high cost. Maintenance and repair need to be operated separately for each water tank, increasing labor and time costs. 2. Nitrogen waste: frequent opening of the nitrogen release valve will cause nitrogen gas to be directly discharged into the atmosphere, resulting in resource waste. Increased nitrogen consumption leads to rising operating costs. 3. Low system complexity and reliability: multiple independent valves and control units increase the complexity of the system, resulting in a high failure rate. Lack of centralized control mechanism makes it difficult to achieve efficient pressure regulation and system optimization. 4. Inconvenient maintenance: when a valve or pipeline fails, maintenance needs to be stopped, affecting the continuous operation of the system. The maintenance process is complex, especially when the water tank needs to be emptied or multiple components need to be disassembled, making the operation difficult. 5. Low pressure regulation efficiency: the conventional system relies on mechanical valves for pressure regulation, which has a slow response speed and is difficult to respond to rapid pressure fluctuations. Lack of intelligent pressure feedback mechanism leads to inaccurate nitrogen supply and release. SUMMARY

[0004] Therefore, the utility model embodiment provides an ultrapure water nitrogen sealing water tank nitrogen supply device to solve the problems of complex structure and inefficient operation of the existing nitrogen sealing system.

[0005] The utility model embodiment provides an ultrapure water nitrogen sealing water tank nitrogen supply device, which comprises:

[0006] The nitrogen supply unit comprises a nitrogen source and a nitrogen supply main pipe, wherein a pressure reducing valve and a nitrogen supply valve are arranged on the nitrogen supply main pipe; and a plurality of nitrogen sealed water tanks are connected to the nitrogen supply main pipe through nitrogen supply branch pipes.

[0007] The nitrogen backflow unit comprises a backflow pipeline and a gas pressure sensor arranged in the backflow pipeline; wherein each nitrogen sealed water tank is connected to a corresponding backflow branch pipe, and a plurality of backflow branch pipes are connected to a backflow main pipe, and the backflow main pipe is communicated to the nitrogen supply main pipe between the pressure reducing valve and the nitrogen supply valve.

[0008] The water sealing unit is connected to each nitrogen sealed water tank.

[0009] The PLC control unit is connected to the nitrogen supply valve and the gas pressure sensor; wherein the PLC control unit is provided with a data table in which different gas pressures correspond to different opening degrees of the nitrogen supply valve.

[0010] Optionally, all the nitrogen sealed water tanks share one water sealing barrel.

[0011] Optionally, the device further comprises:

[0012] The nitrogen backflow valve is arranged in the backflow main pipe.

[0013] Optionally, the gas pressure sensor is arranged in the backflow main pipe between the nitrogen backflow valve and the backflow branch pipe.

[0014] Optionally, the water inlet of any one of the nitrogen sealed water tanks is connected to the water production end, the water inlets of the other nitrogen sealed water tanks are connected to the water outlets of the adjacent nitrogen sealed water tanks in sequence, and the water outlet of the last nitrogen sealed water tank is connected to the pure water pump.

[0015] Optionally, when the gas pressure sensor detects that the gas pressure is greater than a first preset value, the PLC control unit closes the nitrogen supply valve, and the excess nitrogen flows back to the nitrogen source.

[0016] Optionally, when the gas pressure sensor detects that the gas pressure is less than a second preset value, the nitrogen supply valve and the nitrogen backflow valve are opened simultaneously, and the nitrogen supply unit and the nitrogen backflow unit simultaneously provide nitrogen for the nitrogen sealed water tanks.

[0017] Optionally, the pressure reducing valve reduces the pressure of the nitrogen source to 0.2-0.8 MPa.

[0018] Optionally, the water inlet of the water sealing unit is connected to the water production end.

[0019] The device has the following beneficial effects:

[0020] The device provided by the embodiment of the utility model cancels the breathing valve and the nitrogen release valve on each nitrogen sealed water tank, simplifies the system structure, realizes pressure regulation through centralized nitrogen supply and backflow system, and reduces the number of equipment.

[0021] Nitrogen is supplied to each nitrogen sealed water tank through a nitrogen supply valve after being decompressed by a pressure reducing valve. Excess nitrogen is collected and returned through a return pipeline, and a gas pressure sensor is arranged on the return pipeline.

[0022] The plurality of nitrogen sealed water tanks share a water seal barrel, reducing the number of devices and floor space. The water seal barrel is used to prevent nitrogen leakage and external air from entering.

[0023] The nitrogen supply and return are automatically adjusted by a PLC controller and a gas pressure sensor. When the nitrogen pressure in the return pipeline exceeds the set value, the nitrogen supply valve reduces the amount of nitrogen supplied; when the nitrogen is insufficient, the nitrogen supply valve and the return pipeline work simultaneously to ensure sufficient nitrogen supply. BRIEF DESCRIPTION OF DRAWINGS

[0024] The features and advantages of the present application will be more clearly understood through reference to the following drawings, which are presented as exemplary and should not be construed as limiting the present application, in which:

[0025] Figure 1 A structure diagram of a conventional nitrogen sealing system is shown;

[0026] Figure 2 A structure diagram of a nitrogen supply device for a super-pure water nitrogen sealed water tank in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] As shown in Figure 2 the embodiments of the present application provide a nitrogen supply device for a super-pure water nitrogen sealed water tank, comprising: a nitrogen supply unit, a nitrogen return unit, a water seal unit and a PLC control unit, wherein:

[0029] The nitrogen supply unit comprises a nitrogen source and a nitrogen supply main pipe, and a pressure reducing valve and a nitrogen supply valve are installed on the nitrogen supply main pipe; the plurality of nitrogen sealed water tanks are connected to the nitrogen supply main pipe through nitrogen supply branch pipes.

[0030] The nitrogen return unit comprises a return pipeline and a gas pressure sensor arranged in the return pipeline; wherein each nitrogen sealed water tank is connected to a corresponding return branch pipe, and the plurality of return branch pipes are connected to a return main pipe, and the return main pipe is communicated to the nitrogen supply main pipe between the pressure reducing valve and the nitrogen supply valve.

[0031] The water seal unit is connected with each nitrogen seal water tank.

[0032] The PLC control unit is connected with the nitrogen supply valve and the gas pressure sensor. The PLC control unit has a preset data table of different gas pressures corresponding to different nitrogen supply valve openings.

[0033] It should be noted that the control of the nitrogen valve opening by adjusting the gas pressure in the present embodiment is a function of the PLC control unit itself. The data table of different gas pressures corresponding to different nitrogen supply valve openings can be set according to actual needs.

[0034] In the present embodiment, the pressure reducing valve reduces the pressure of the nitrogen source to 0.2-0.8 MPa. The PLC control unit controls the opening of the nitrogen supply valve according to the feedback of the gas pressure sensor, thereby adjusting the nitrogen supply. Specifically, the PLC control unit automatically adjusts the opening of the nitrogen supply valve according to the gas pressure value detected by the gas pressure sensor in real time, according to the preset data table, to ensure the balance of nitrogen supply and reflux.

[0035] The reflux pipeline collects excess nitrogen and returns it to the nitrogen source.

[0036] The gas pressure sensor monitors the nitrogen pressure in the reflux pipeline in real time and feeds back to the nitrogen supply valve for adjustment.

[0037] As an optional embodiment, all nitrogen seal water tanks share one water seal barrel.

[0038] In the present embodiment, multiple nitrogen seal water tanks share one water seal barrel, reducing the number of equipment and floor area. The water seal barrel is used to prevent nitrogen leakage and external air from entering.

[0039] As an optional embodiment, a nitrogen reflux valve is also included and is arranged in the reflux main pipe.

[0040] In the present embodiment, the nitrogen reflux valve is also connected with the PLC control unit and is opened or closed by the PLC control unit. In a specific embodiment, the opening and closing state of the nitrogen reflux valve is also related to the nitrogen pressure value in the reflux pipeline.

[0041] As an optional embodiment, the gas pressure sensor is installed in the reflux main pipe between the nitrogen reflux valve and the reflux branch pipe.

[0042] As an optional embodiment, the water inlet of any one nitrogen seal water tank is connected with the water production end, the water inlets of other nitrogen seal water tanks are connected with the water outlets of the adjacent nitrogen seal water tanks in front, and the water outlet of the last nitrogen seal water tank is connected with the pure water pump.

[0043] As an optional embodiment, when the gas pressure sensor detects that the gas pressure is greater than a first preset value, the PLC control unit closes the nitrogen supply valve, and the excess nitrogen is returned to the nitrogen source.

[0044] As an optional implementation, when the gas pressure sensor detects that the gas pressure is less than the second preset value, the nitrogen supply valve and the nitrogen backflow valve are opened simultaneously, and the nitrogen supply unit and the nitrogen backflow unit simultaneously supply nitrogen to the nitrogen sealed water tank.

[0045] As an optional implementation, the pressure reducing valve reduces the nitrogen source pressure to 0.2-0.8 MPa.

[0046] The working principle of the nitrogen supply device for the ultrapure water nitrogen sealed water tank provided in the embodiments of the present application is described as follows:

[0047] 1. Nitrogen supply:

[0048] The nitrogen source is reduced to 0.2-0.8 MPa by the pressure reducing valve, and then supplied to each nitrogen sealed water tank through the nitrogen supply valve.

[0049] When the pressure in the nitrogen sealed water tank increases, the PLC control unit adjusts the opening degree of the gas supply valve according to the feedback of the gas pressure sensor, thereby reducing the nitrogen supply amount.

[0050] 2. Nitrogen backflow:

[0051] The excess nitrogen is backflowed to the nitrogen source through the backflow pipeline.

[0052] When the nitrogen pressure in the backflow pipeline exceeds the first preset value, the nitrogen supply valve further reduces the nitrogen supply amount.

[0053] 3. Nitrogen replenishment:

[0054] When the nitrogen pressure in the backflow pipeline is lower than the second preset value, it is determined that the current nitrogen is insufficient, at which time the nitrogen supply valve and the backflow pipeline work simultaneously to ensure sufficient nitrogen supply.

[0055] 4. Water seal protection:

[0056] The plurality of nitrogen sealed water tanks share one water seal barrel to prevent nitrogen leakage and external air from entering.

[0057] The embodiments of the present application provide a nitrogen supply device for an ultrapure water nitrogen sealed water tank, which cancels the independent breathing valve and nitrogen release valve on each nitrogen sealed water tank, adopts a centralized nitrogen supply and backflow system, significantly reduces the number of devices, solves the problems of device redundancy and high cost in the traditional system, and reduces the device procurement and maintenance costs.

[0058] Through the centralized backflow system and intelligent control, the excess nitrogen is recovered to the nitrogen source, avoiding direct discharge of nitrogen to the atmosphere, solving the problem of nitrogen waste caused by frequent opening of the nitrogen release valve in the traditional system, and reducing the operating cost.

[0059] The PLC controller and the gas pressure sensor are introduced to realize automatic adjustment of nitrogen supply and backflow, ensure stable operation of the system, and solve the problems of system complexity and high failure rate caused by multiple independent valves and control units in the traditional system.

[0060] After the independent valve is cancelled, the system structure is simplified, and it is not necessary to operate each water tank individually during maintenance, thereby reducing the maintenance difficulty, solving the problem of inconvenient maintenance and the need for shutdown operation in the traditional system, and improving the maintainability and operation continuity of the system.

[0061] The nitrogen gas pressure in the backflow pipeline is monitored in real time through the gas pressure sensor, and the opening degree of the nitrogen supply valve is accurately adjusted in combination with the PLC controller, thereby solving the problems of low pressure regulation efficiency and slow response speed in the traditional system, and realizing fast and accurate pressure control.

[0062] The multiple nitrogen sealed water tanks share one water seal barrel, thereby reducing the equipment floor area, and solving the problems of equipment redundancy and space waste caused by the separate configuration of the water seal barrel for each water tank in the traditional system.

[0063] The automatic management of nitrogen supply and backflow is realized through the intelligent control system, thereby improving the operation efficiency of the system, solving the low efficiency problem caused by the dependence on manual operation and mechanical valve adjustment in the traditional system, and realizing the intelligent operation of the system.

[0064] The nitrogen supply device of the ultra-pure water nitrogen sealed water tank provided in the embodiment simplifies the equipment structure, reduces the operation cost, improves the reliability and economy of the system, successfully overcomes the problems of equipment redundancy, nitrogen waste, system complexity and inconvenient maintenance existing in the traditional nitrogen sealing system, and has remarkable beneficial effects.

[0065] Although the embodiments of the present application are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An ultra-pure water nitrogen-sealed water tank nitrogen supply device, characterized by, The application relates to a nitrogen supply device for a water tank. The nitrogen supply device comprises a nitrogen source, a nitrogen supply main pipe, a pressure reducing valve and a nitrogen supply valve, a plurality of nitrogen sealed water tanks connected to the nitrogen supply main pipe through nitrogen supply branch pipes, a nitrogen backflow unit, a water sealing unit and a PLC control unit. The nitrogen backflow unit comprises a backflow pipeline and a gas pressure sensor installed in the backflow pipeline. Each of the nitrogen sealed water tanks is connected to a corresponding backflow branch pipe, and the backflow branch pipes are connected to a backflow main pipe which is connected to the nitrogen supply main pipe between the pressure reducing valve and the nitrogen supply valve. The water sealing unit is connected to each of the nitrogen sealed water tanks.

2. The ultrapure water nitrogen sealed water tank nitrogen supply device according to claim 1, characterized in that, The PLC control unit is connected to the nitrogen supply valve and the gas pressure sensor.

3. The apparatus according to claim 1, wherein the apparatus is characterized by: The PLC control unit has a data table in which different gas pressures correspond to different nitrogen supply valve opening degrees. All the nitrogen sealed water tanks share one water sealing tank.

4. The ultrapure water nitrogen sealed water tank nitrogen supply device according to claim 3, characterized in that, The nitrogen backflow valve is arranged in the backflow main pipe.

5. The ultrapure water nitrogen sealed water tank nitrogen supply device according to claim 1, characterized in that, The gas pressure sensor is arranged in the backflow main pipe between the nitrogen backflow valve and the backflow branch pipe.

6. The ultrapure water nitrogen sealed water tank nitrogen supply device according to claim 1, characterized in that, The water inlet of any one of the nitrogen sealed water tanks is connected to a water outlet of a previous adjacent nitrogen sealed water tank.

7. The ultrapure water nitrogen sealed water tank nitrogen supply device according to claim 4, characterized in that, The water outlet of the last nitrogen sealed water tank is connected to a pure water pump.

8. The ultrapure water nitrogen sealed water tank nitrogen supply device according to claim 1, characterized in that, When the gas pressure sensor detects that the gas pressure is greater than a first preset value, the PLC control unit closes the nitrogen supply valve, and the excess nitrogen backflows to the nitrogen source.

9. The ultrapure water nitrogen sealed water tank nitrogen supply device according to claim 5, characterized in that, When the gas pressure sensor detects that the gas pressure is less than a second preset value, the nitrogen supply valve and the nitrogen backflow valve are opened simultaneously, and the nitrogen supply unit and the nitrogen backflow unit simultaneously supply nitrogen to the nitrogen sealed water tanks. The pressure reducing valve reduces the pressure of the nitrogen source to 0.2-0.8 MPa. The water inlet of the water sealing unit is connected to the water outlet of the last nitrogen sealed water tank.

Images