Automatic carrier gas switching device for industrial analysis cabin

Abstract

The utility model relates to an automatic carrier gas switching device for an industrial analysis cabin, and belongs to the technical field of gas detection. The device mainly comprises a pressure transmitter, an electromagnetic valve, a diaphragm valve, a filter, a flame arrester and the like, and aims to realize automatic switching of carrier gas bottles for an analyzer in an industrial analysis cabin, so that the influence of repeated manual replacement on work analysis is avoided. The pressure sensor is arranged on the main gas path, the real-time pressure in the current carrier gas bottle is accurately measured, and the pressure reducing valve is automatically opened or closed by adopting program setting, so that automatic switching and remote monitoring of the two gas paths are realized. In addition, according to the design, the gas outlets of the multiple gas carrying bottles are connected to the same gas outlet header pipe, and the frequency of replacing the gas carrying bottles is effectively reduced. According to the design, few devices are adopted, repeated replacement by field operators is not needed during normal work, and carrier gas switching is more reliable and safer.

Description

Technical Field

[0001] The utility model relates to the technical field of gas measurement, in particular to an automatic carrier gas switching device for an industrial analysis hut. Background Art

[0002] At present, in most industrial plant sites, especially in the chemical industry, analysis huts are generally set up to support the production process. When the chromatographic analysis instruments in these analysis huts are operating, they rely on carrier gas to push the sample gas into the chromatographic column for analysis. However, the traditional maintenance method requires personnel to estimate the remaining amount of carrier gas and manually replace the carrier gas cylinder, which not only increases the dependence on personnel but also may affect the continuous and stable operation of the equipment. If the carrier gas cylinder is not replaced in time, it may lead to detection failure, and even accelerate the aging of the chromatographic column and components, thus affecting the normal operation of the on-line analysis instrument. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an automatic carrier gas switching device for an industrial analysis hut to ensure the continuous and stable operation of the chromatographic analysis instrument and improve production efficiency and safety.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is:

[0005] An automatic carrier gas switching device for an industrial analysis hut, the carrier gas automatic switching device is provided with two gas paths, namely a left gas path and a right gas path. The two gas paths converge to a pressure reducing valve and exit through a second flame arrester to an on-line analysis instrument, and the two gas paths are also connected to a first flame arrester for evacuation.

[0006] The structures of the above left gas path and right gas path are as follows:

[0007] The left gas path is provided with a first hydrogen carrier gas cylinder, and behind the first hydrogen carrier gas cylinder, there are successively connected a first T-shaped flame arrester, a first diaphragm valve, a left gas path pressure transmitter and a first solenoid valve. After the first solenoid valve is connected to a second diaphragm valve, it is connected to the pressure reducing valve, and after the first solenoid valve is connected to a third diaphragm valve, it is connected to the first flame arrester;

[0008] The right gas path is provided with a second hydrogen carrier gas cylinder, and behind the second hydrogen carrier gas cylinder, there are successively connected a second T-shaped flame arrester, a fourth diaphragm valve, a right gas path pressure transmitter and a second solenoid valve. After the second solenoid valve is connected to a fifth diaphragm valve, it is connected to the pressure reducing valve, and after the second solenoid valve is connected to a sixth diaphragm valve, it is connected to the first flame arrester.

[0009] A first one-way valve is provided between the above left gas path pressure transmitter and the first solenoid valve;

[0010] A second one-way valve is provided between the above right gas path pressure transmitter and the second solenoid valve.

[0011] The above-mentioned first solenoid valve and second solenoid valve are provided with passages connected to the first flame arrester.

[0012] The above-mentioned first hydrogen gas cylinder and second hydrogen gas cylinder are formed by connecting multiple hydrogen gasses in parallel.

[0013] A carrier gas automatic switching device for an industrial analysis hut provided by the present utility model precisely measures the real-time pressure in the current gas cylinder by setting a pressure sensor on the main gas path. If the gas path is set by a program to automatically open or close the pressure reducing valve, automatic switching and remote monitoring of two gas paths can be achieved. In addition, the design connects the gas outlets of multiple gas cylinders to the same main outlet pipe, effectively reducing the frequency of replacing gas cylinders. The equipment used in this design is less, and there is no need for on-site operators to repeatedly replace during normal operation, making the carrier gas switching more reliable and safe.

[0014] It has the following beneficial effects:

[0015] 1. Changing the gas source provided by a single previous gas cylinder to multiple gas cylinders sharing, reducing the replacement frequency of maintenance personnel and reducing the safety risk during the replacement process.

[0016] 2. According to the air pressure of the carrier gas output from the left gas path and the right gas path feedback by the left gas path pressure transmitter and the right gas path pressure transmitter, automatically change the gas path connected to the analytical instrument, which not only improves the safety of the analytical instrument and the accuracy of the analysis results, but also improves the analysis efficiency.

[0017] 3. For flammable and explosive carrier gas, using a flame arrester is an effective safety measure, which can effectively prevent dangerous situations such as backfire during the switching system, thus ensuring the overall safety of the system.

[0018] 4. The device uses multiple manual diaphragm valves, which can effectively prevent impurity gases in the carrier gas from entering the analytical equipment. At the same time, it is convenient for the temporary maintenance of each instrument device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0020] Figure 1 It is a structural schematic diagram of the present utility model.

[0021] In the figure: First hydrogen gas cylinder 1, First T-shaped flame arrester 2, First diaphragm valve 3, Left gas path pressure transmitter 4, First one-way valve 5, First solenoid valve 6, Second diaphragm valve 7, Third diaphragm valve 8, First flame arrester 9, Pressure reducing valve 10, Second hydrogen gas cylinder 11, Second T-shaped flame arrester 12, Fourth diaphragm valve 13, Right gas path pressure transmitter 14, Second one-way valve 15, Second solenoid valve 16, Fifth diaphragm valve 17, Sixth diaphragm valve 18, Second flame arrester 19. Detailed implementation mode

[0022] As Figure 1 As shown in [reference], an automatic carrier gas switching device for an industrial analysis cabin is provided with two gas paths, namely a left gas path and a right gas path. The two gas paths converge to a pressure reducing valve 10 and discharge gas to an on-line analyzer through a second flame arrester 19. The two gas paths are also connected to a first flame arrester 9 for evacuation.

[0023] The structures of the above-mentioned left gas path and right gas path are as follows:

[0024] The left gas path is provided with a first hydrogen carrier gas cylinder 1. After the first hydrogen carrier gas cylinder 1, there are successively connected a first T-shaped flame arrester 2, a first diaphragm valve 3, a left gas path pressure transmitter 4, and a first electromagnetic valve 6. After being connected with a second diaphragm valve 7, the first electromagnetic valve 6 is connected to the pressure reducing valve 10. After being connected with a third diaphragm valve 8, the first electromagnetic valve 6 is connected to the first flame arrester 9;

[0025] The right gas path is provided with a second hydrogen carrier gas cylinder 11. After the second hydrogen carrier gas cylinder 11, there are successively connected a second T-shaped flame arrester 12, a fourth diaphragm valve 13, a right gas path pressure transmitter 14, and a second electromagnetic valve 16. After being connected with a fifth diaphragm valve 17, the second electromagnetic valve 16 is connected to the pressure reducing valve 10. After being connected with a sixth diaphragm valve 18, the second electromagnetic valve 16 is connected to the first flame arrester 9.

[0026] A first one-way valve 5 is provided between the above-mentioned left gas path pressure transmitter 4 and the first electromagnetic valve 6;

[0027] A second one-way valve 15 is provided between the above-mentioned right gas path pressure transmitter 14 and the second electromagnetic valve 16.

[0028] The above-mentioned first electromagnetic valve 6 and second electromagnetic valve 16 are provided with a passage connected to the first flame arrester 9.

[0029] The above-mentioned first hydrogen carrier gas cylinder 1 and second hydrogen carrier gas cylinder 11 are formed by connecting multiple hydrogen cylinders in parallel.

[0030] Example:

[0031] An automatic carrier gas switching device for an industrial analysis cabin, which uses a stainless steel wire drawing plate as a fixed base for each instrument and equipment. This wire drawing plate can be conveniently fixed on the outer wall of the analysis cabin. Two gas paths, namely the left gas path and the right gas path, are designed to provide carrier gas, and each gas path can be connected to three or more carrier gas cylinders. Two solenoid valves are used. In the left gas path and the right gas path, the solenoid valves are respectively connected to the instruments and meters. The solenoid valves are used to switch the gas paths connected to the analysis instruments, and safety valves are provided on the solenoid valves to discharge when the carrier gas pressure exceeds the limit. Remote pressure transmitters are used. On both sides of the left gas path and the right gas path, the pressure transmitters are respectively arranged in the middle of the one-way valve and the diaphragm valve. These pressure transmitters monitor the pressure conditions of the carrier gas in the two gas paths in real time. One-way valves are used and are respectively connected in the middle of the remote pressure transmitter and the solenoid valve to ensure the unidirectional flow of the carrier gas, prevent gas backflow and pressure surges. Diaphragm valves are used. At the connection points of the pipelines of the left gas path and the right gas path and the instrument equipment, diaphragm valves are provided. The diaphragm valves can be manually switched on and off and are used for evacuation and instrument equipment maintenance after switching the carrier gas cylinders. Flame arresters are used. Flame arresters are respectively arranged on the evacuation and outlet pipelines of the carrier gas path, mainly used to prevent gas backfire and ensure system safety when the carrier gas is hydrogen. According to the gas path structure, a control unit can be designed and is respectively associated with the pressure transmitters and solenoid valves of the left gas path and the right gas path. This control unit controls the solenoid valves to switch the gas paths connected to the analysis instruments according to the carrier gas pressure output by the pressure transmitters of the left gas path and the right gas path.

[0032] Working principle:

[0033] 1. As mentioned above, according to the existing technology, there are three chromatographic analyzers on site in the device, and the carrier gas is consumed quickly. Approximately 6 bottles of carrier gas are needed per month, and each time the carrier gas is replaced, it takes more than one hour. To reduce the frequency of carrier gas replacement, ensure the continuity of data, reduce the operation risks and labor intensity of personnel, the number of carrier gas replacement operations is reduced from 6 times / month to 1 time / month;

[0034] 2. Before the normal operation of the device, as Figure 1 shown, 6 carrier gas cylinders need to be divided into two paths, namely the left gas path 1 and the right gas path 11 (three on the left and three on the right), and connected into the switching device. After the connection, close the diaphragm valves 7 and 17 and the pressure reducing valves 10 in the left and right gas paths, and open the manual valves 3 and 13, diaphragm valves 8 and 18, and solenoid valves 6 and 16 in the left and right gas paths. Discharge and evacuate the gas in the carrier gas cylinders through the flame arrester 9 to improve the purity of the carrier gas in the gas path;

[0035] 3. After the discharge meets the requirements, close the diaphragm valves 8 and 18 and open the diaphragm valves 7 and 17. Connect the left gas path pressure transmitter 4 and the right gas path pressure transmitter 14 to the DCS computer to display the carrier gas pressure in the left and right gas paths in real time;

[0036] 4. Design the control unit. Starting from the left gas path, the control unit is associated with two solenoid valves (left and right) and two pressure remote transmitters (left and right). When the pressure in the left gas path is lower than the set value, the DCS computer will give an alarm to remind the operator to replace the gas cylinder. At the same time, it will automatically open the solenoid valve of the right gas path and close the solenoid valve of the left gas path. Similarly, when the pressure in the right gas path is lower than the set value, it will automatically open the solenoid valve of the left gas path and close the solenoid valve of the right gas path. At this time, the operator can replace the three gas cylinders in the right gas path.

[0037] 5. Take the replacement of the gas cylinder in the left gas path as an example for the operation of replacing the gas cylinder. First, after the pressure is low, the control unit will close the solenoid valve 6 to cut off the current gas path to ensure the safety of the operation. Subsequently, the operator manually closes the diaphragm valve 7 to further isolate the gas path. Next, to release the residual gas in the gas path, both the solenoid valve 6 and the diaphragm valve 8 are opened for pressure relief operation. After connecting the new gas cylinder, the diaphragm valve 3 is reopened to enable the new gas cylinder to be smoothly connected to the gas path.

[0038] Subsequently, the system enters the discharge operation stage before normal operation to ensure that the gas in the new gas cylinder can flow into the system purely and any possible impurities or residual air are excluded. Similarly, the steps for replacing the gas cylinder in the right gas path are the same as those in the left gas path.

Claims

1. An automatic carrier gas switching device for an industrial analysis hut, characterized in that The carrier gas automatic switching device is provided with two gas paths, namely a left gas path and a right gas path. The two gas paths converge to a pressure reducing valve (10) and discharge gas to an on-line analyzer through a second flame arrester (19). The two gas paths are also connected to a first flame arrester (9) for evacuation; The structures of the left gas path and the right gas path are as follows: The left gas path is provided with a first hydrogen carrier gas cylinder (1). After the first hydrogen carrier gas cylinder (1), a first T-shaped flame arrester (2), a first diaphragm valve (3), a left gas path pressure transmitter (4), and a first solenoid valve (6) are sequentially connected. After the first solenoid valve (6) is connected to a second diaphragm valve (7), it is connected to the pressure reducing valve (10). After the first solenoid valve (6) is connected to a third diaphragm valve (8), it is connected to the first flame arrester (9); The right gas path is provided with a second hydrogen carrier gas cylinder (11). After the second hydrogen carrier gas cylinder (11), a second T-shaped flame arrester (12), a fourth diaphragm valve (13), a right gas path pressure transmitter (14), and a second solenoid valve (16) are sequentially connected. After the second solenoid valve (16) is connected to a fifth diaphragm valve (17), it is connected to the pressure reducing valve (10). After the second solenoid valve (16) is connected to a sixth diaphragm valve (18), it is connected to the first flame arrester (9).

2. The carrier gas automatic switching device for an industrial analysis hut according to claim 1, characterized in that, A first check valve (5) is provided between the left gas path pressure transmitter (4) and the first solenoid valve (6); A second check valve (15) is provided between the right gas path pressure transmitter (14) and the second solenoid valve (16).

3. The carrier gas automatic switching device for an industrial analysis hut according to claim 2, characterized in that, The first solenoid valve (6) and the second solenoid valve (16) are provided with a passage connected to the first flame arrester (9).

4. The carrier gas automatic switching device for an industrial analysis hut according to claim 3, characterized in that, The first hydrogen carrier gas cylinder (1) and the second hydrogen carrier gas cylinder (11) are formed by connecting multiple hydrogen cylinders in parallel.

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