CN210741764U - Device for detecting inner leakage of pneumatic valve of simulated moving bed - Google Patents

Abstract

The utility model relates to a device for detecting the internal leakage of a pneumatic valve of a simulated moving bed, which is used for detecting the internal leakage of valves of a plurality of chromatographic column pipeline systems, wherein circulating pipes which are mutually communicated are respectively arranged between each chromatographic column pipeline system, and each chromatographic column pipeline system comprises a chromatographic column, a main pipeline, a liquid inlet pipe, a water inlet pipe and a first discharging pipe; the main pipeline is also provided with a main pipeline sampling tube for leak detection of the main pipeline, the liquid inlet pneumatic valve and the water inlet pneumatic valve are respectively arranged on the liquid inlet pipe and the water inlet pipe, the first discharging pneumatic valve and the first sampling tube for leak detection are respectively arranged on the first discharging pipe, and the circulating pneumatic valve is arranged on the circulating pipe. The utility model discloses still disclose a detection method who uses device. The utility model discloses a set up the valve that leaks hunting sample pipeline and correspond, there is unusual valve according to the flow direction of liquid in time investigation, need not the stop equipment operation, can find out unusual valve troubleshooting fast.

Description

Device for detecting inner leakage of pneumatic valve of simulated moving bed

Technical Field

The utility model belongs to the technical field of the valve leak testing, in particular to leak detection device in simulated moving bed pneumatic valve.

Background

The simulated moving bed device is widely applied to the biological, food and fine chemical industries, and comprises 8-30 chromatographic columns, wherein each chromatographic column is composed of a plurality of pneumatic valves for controlling an input pipeline, an output pipeline and a circulating pipeline, and the respective working states of all the pneumatic valves are controlled by a PLC (programmable logic controller) or a single chip microcomputer control system. The pipeline pneumatic regulating valve is composed of a pneumatic actuator and a regulating valve, the pneumatic actuator receives signals of a control system, a plurality of groups of combined pneumatic pistons in the actuator are pushed to move by utilizing compressed air, the air inlet and outlet positions are changed to change the rotation direction of the main shaft, and the valve is driven to work according to the requirement of the rotation torque required by the load (valve). The two-position five-way electromagnetic valve is usually matched with a double-acting pneumatic actuating mechanism for use, the two positions are controllable, namely on-off, the five-way valve is provided with five channels for ventilation, one of the five channels is connected with an air source, the two five channels are connected with an air inlet and an air outlet of an external air chamber of a double-acting cylinder, and the two five channels are connected with an air inlet and an air outlet of an internal air chamber. The pneumatic valve of the simulated moving bed device is frequently switched and used in daily work, after the operation time is long, abrasion is generated between a valve main body and an accessory, and the pneumatic ball valve cannot be completely sealed by touching, so that the phenomenon of inner leakage or outer leakage of feed liquid can be possibly caused. The outer hourglass phenomenon can be followed and taken measures the benefit of leaking after the surperficial direct observation, nevertheless take place interior hourglass back, because the device pipeline is more, hardly directly find out interior hourglass valve, lead to the quality accident to appear in the production process, make the unable normal operating of equipment.

The patent publication CN102918181A discloses a simulation system for detecting internal leakage of a hydrocarbon valve, which determines the state of internal leakage of the valve by controlling different opening degrees of the valve, forms a set of determination software on the basis of a large amount of data, and determines whether internal leakage of the valve occurs and the amount of leakage by calling corresponding information in a database during on-site off-line detection. However, in the technology, the valve internal leakage is measured by using a flowmeter, the range of the flowmeter is narrow, the sizes of the valves are different, the difference of the internal leakage is large, the implementation cost is high, and the reliability of data is difficult to ensure. The patent with publication number CN104931213A discloses a test device and a test for simulating internal leakage of a gas valve, which mainly simulates the internal leakage of the valve, adopts a pressure regulating valve to control the upstream and downstream pressures of the test valve, simulates the real working condition of the valve in the petrochemical production process, and directly uses an empirical algorithm formed by analyzing test data for diagnosing the internal leakage of the valve under the similar working condition. The technology is used for judging the abnormity appearing in the actual production condition by simulating the real working condition of the valve in petrochemical production, has limitation, and is not suitable for detecting the inner leakage of the valve of the simulated moving bed device.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a leak detection device in simulated moving bed pneumatic valve is provided, aim at solving the technical problem of troubleshooting difficulty in the simulated moving bed pneumatic valve in the prior art when leaking.

The utility model is realized like this, provide a leak detection device in simulated moving bed pneumatic valve for leak in the valve to a plurality of chromatographic column pipe-line systems detects, be provided with the circulating pipe of mutual intercommunication between each chromatographic column pipe-line system respectively, each chromatographic column pipe-line system includes chromatographic column, the total pipeline of being connected with the chromatographic column and with total pipeline connection and the feed liquor pipe, inlet tube and the first discharging pipe that connect in parallel each other, the circulating pipe also connects in parallel on the total pipeline with the first discharging pipe; the chromatographic column is used for separating raw material liquid, the separated material liquid is output from the first discharge pipe, the liquid inlet pipe is used for conveying the raw material liquid to the chromatographic column, and the water inlet pipe is used for conveying purified water for regenerating the chromatographic column; the total pipeline sets up the main valve still set up the total pipeline sampling tube that total pipeline was leaked and is used on the total pipeline set up total sampling pneumatic valve on the total pipeline sampling tube the feed liquor pneumatic valve has been set up respectively on feed liquor pipe and the inlet tube and the pneumatic valve of intaking set up first ejection of compact pneumatic valve respectively on the first discharging pipe and for its first sampling tube of leaking and using set up first sampling pneumatic valve on the first sampling tube set up the circulation pneumatic valve on the circulating pipe.

Furthermore, a second discharging pipe connected with the first discharging pipe in parallel is communicated with the main pipeline, the refractive index of the material liquid output by the second discharging pipe is different from that of the first discharging pipe, a second discharging pneumatic valve and a second sampling pipe for leakage detection are arranged on the second discharging pipe, and a second sampling pneumatic valve is arranged on the second sampling pipe.

Furthermore, the main pipeline is also communicated with a third discharging pipe connected with the first discharging pipe in parallel, the refractive index of the feed liquid output by the third discharging pipe is different from that of the first discharging pipe and that of the second discharging pipe, the third discharging pipe is provided with a third discharging pneumatic valve and a third sampling pipe for leakage detection, and the third sampling pipe is provided with a third sampling pneumatic valve.

Compared with the prior art, the utility model discloses a leak detection device in simulated moving bed pneumatic valve utilizes in the technology operation shift time, opens first sample pneumatic valve, according to the flow direction of feed liquid, can in time investigate and have unusual pneumatic valve, need not the stop equipment operation, can find out unusual pneumatic valve troubleshooting fast, and this scheme can regularly carry out valve leak hunting work to easy operation, with low costs.

Drawings

Fig. 1 is a schematic view of the working principle of a preferred embodiment of the device for detecting the inner leakage of the pneumatic valve of the simulated moving bed of the present invention.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

Referring to fig. 1, the present invention provides a preferred embodiment of a device for detecting inner leakage of a pneumatic valve of a simulated moving bed, which is used for detecting inner leakage of valves of a plurality of chromatographic column pipeline systems. The simulated moving bed comprises six chromatographic column pipeline systems for separating maltitol solution, and circulating pipes 6 which are communicated with each other are respectively arranged between each chromatographic column pipeline system. Each chromatographic column pipeline system comprises a chromatographic column 1, a main pipeline 2 connected with the chromatographic column 1, and a liquid inlet pipe 7, a water inlet pipe 8 and a first discharge pipe 3 which are connected with the main pipeline 2 and are connected in parallel, wherein the circulating pipe 6 and the first discharge pipe 3 are also connected in parallel on the main pipeline 2.

The chromatographic column 1 separates raw material liquid, and the separated raw material liquid is output from a first discharge pipe 3. The liquid inlet pipe 7 is used for conveying raw material liquid to the chromatographic column 1, and the water inlet pipe 8 is used for conveying purified water for regenerating the chromatographic column 1.

The main pipeline 2 is provided with a main valve 21, the main pipeline 2 is also provided with a main pipe sampling pipe 9 for leakage detection of the main pipeline 2, and the main pipe sampling pipe 9 is provided with a main pipe sampling pneumatic valve 91. An inlet pneumatic valve 71 and an inlet pneumatic valve 81 are respectively provided on the inlet pipe 7 and the inlet pipe 8. The first discharging pneumatic valve 31 and the first sampling pipe 32 for leak detection are respectively provided on the first discharging pipe 3, the first sampling pneumatic valve 33 is provided on the first sampling pipe 32, and the circulating pneumatic valve 61 is provided on the circulating pipe 6.

The main pipeline 2 is also communicated with a second discharging pipe 4 connected with the first discharging pipe 3 in parallel, and the refractive index of the feed liquid output by the second discharging pipe 4 is different from that of the first discharging pipe 3. The second discharging pneumatic valve 41 and a second sampling pipe 42 for leak detection are provided on the second discharging pipe 4, and a second sampling pneumatic valve 43 is provided on the second sampling pipe 42.

The main pipeline 2 is also communicated with a third discharging pipe 5 connected with the first discharging pipe 3 in parallel, and the refractive index of the feed liquid output by the third discharging pipe 5 is different from that of the first discharging pipe 3 and that of the second discharging pipe 4. A third discharge air-operated valve 51 and a third sampling pipe 52 for leak detection are provided in the third discharge pipe 5, and a third sampling air-operated valve 53 is provided in the third sampling pipe 52.

Use the utility model discloses a method that leaks detection device and detect in simulated moving bed pneumatic valve, this simulated moving bed that needs to detect contain six chromatographic column pipe-line systems that are used for separating maltitol liquid, at first leak in the simulated moving bed pneumatic valve to one of them arbitrary chromatographic column pipe-line system and detect, include following step:

step 1, when the chromatographic system runs to a certain period, all valves in the pipeline system of the chromatographic column 1 are in a closed state, and comprise a first discharging pneumatic valve 31, a second discharging pneumatic valve 41, a third discharging pneumatic valve 51, a circulating pneumatic valve 61, a liquid inlet pneumatic valve 71, a water inlet pneumatic valve 81 and a main valve 21. Opening a main pipe sampling pneumatic valve 91, and checking whether a feed liquid overflow condition exists in a main pipe sampling pipe 9; if not, it is determined that the first discharge air-operated valve 31, the second discharge air-operated valve 41, the third discharge air-operated valve 51, the circulation air-operated valve 61, the intake air-operated valve 71, and the intake air-operated valve 81 are in a good state without leakage; if yes, detecting the refractivity of the overflow feed liquid, and if the detected refractivity is 50 +/-1 percent and is consistent with the refractivity of the maltitol raw material liquid in the liquid inlet pipe 7, judging that the liquid inlet pneumatic valve 71 has leakage; if the detected refractive index is zero, it is determined that there is a leak in the intake pneumatic valve 81; if the detected refractive index is 38 +/-1 percent and is consistent with the refractive index of the maltitol material liquid of the first discharging pneumatic valve 31, judging that the first discharging pneumatic valve 31 has leakage; if the detected refractive index is 1.5 +/-1 percent and is consistent with the refractive index of the maltitol material liquid of the second discharging pneumatic valve 41, judging that the second discharging pneumatic valve 41 has leakage; if the detected refractive index is 5.5 +/-1 percent and is consistent with the refractive index of the maltitol material liquid of the third discharging pneumatic valve 51, judging that the third discharging pneumatic valve 51 has leakage; if the detected refractive index is not consistent with the refractive indexes of the feed liquids of the first discharging air-operated valve 31, the second discharging air-operated valve 41, and the third discharging air-operated valve 51, it is determined that there is a leak in the circulating air-operated valve 61.

The method of the following step 2 is used for detecting the leakage of the first discharging air-operated valve 31, the second discharging air-operated valve 41 and the third discharging air-operated valve 51, and comprises the following steps:

step 2, closing the first discharging pneumatic valve 31, opening the first sampling pneumatic valve 33, checking whether the first sampling pipe 32 has the feed liquid overflow condition, and if not, judging that the first discharging pneumatic valve 31 has no leakage and has a good state; if so, it is judged that the first discharge air-operated valve 31 has a leak; by analogy, the leakage conditions of the second discharging air-operated valve 41 and the third discharging air-operated valve 51 are respectively detected.

And 3, checking the leakage conditions of the first discharging air-operated valve 31, the second discharging air-operated valve 41 and the third discharging air-operated valve 51 of the other five chromatographic column pipeline systems according to the method of the step 2.

And 4, if the first discharging pneumatic valve 31, the second discharging pneumatic valve 41 or the third discharging pneumatic valve 51 is checked to have no feed liquid overflow condition, continuing to execute the step 1 to detect whether other valves have leakage.

And 5, performing the steps 1 to 4 by analogy in sequence, and checking the internal leakage condition of the pneumatic valves of other five chromatographic column pipeline systems.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (3)

1. A simulated moving bed pneumatic valve inner leakage detection device is used for detecting valve inner leakage of a plurality of chromatographic column pipeline systems and is characterized in that circulating pipes (6) which are communicated with each other are arranged between the chromatographic column pipeline systems respectively, each chromatographic column pipeline system comprises a chromatographic column (1), a main pipeline (2) connected with the chromatographic column (1), a liquid inlet pipe (7), a water inlet pipe (8) and a first discharging pipe (3) which are connected with the main pipeline (2) in parallel and connected with each other in parallel, and the circulating pipes (6) and the first discharging pipes (3) are connected on the main pipeline (2) in parallel; the chromatographic column (1) separates raw material liquid, the separated material liquid is output from the first discharge pipe (3), the liquid inlet pipe (7) is used for conveying the raw material liquid to the chromatographic column (1), and the water inlet pipe (8) is used for conveying purified water for regenerating the chromatographic column (1); main pipeline (2) set up main valve (21) still set up main pipeline (2) on main pipeline (2) and leak hunting main sampling pipe (9) of usefulness set up main sampling pneumatic valve (91) on main sampling pipe (9) set up feed liquor pneumatic valve (71) and intake pneumatic valve (81) respectively on feed liquor pipe (7) and inlet tube (8) set up first ejection of compact pneumatic valve (31) and for its first sampling pipe (32) of usefulness of leaking hunting on first discharging pipe (3) set up first sampling pneumatic valve (33) on first sampling pipe (32) circulating pipe (6) have set up circulation pneumatic valve (61).

2. The simulated moving bed pneumatic valve internal leakage detection device according to claim 1, wherein a second discharging pipe (4) connected in parallel with the first discharging pipe (3) is further communicated with the main pipeline (2), the refractive index of the feed liquid output by the second discharging pipe (4) is different from that of the first discharging pipe (3), a second discharging pneumatic valve (41) and a second sampling pipe (42) for detecting leakage are arranged on the second discharging pipe (4), and a second sampling pneumatic valve (43) is arranged on the second sampling pipe (42).

3. The simulated moving bed pneumatic valve internal leakage detection device according to claim 2, wherein a third discharging pipe (5) connected in parallel with the first discharging pipe (3) is further communicated with the main pipeline (2), the refractive index of the feed liquid output by the third discharging pipe (5) is different from that of the first discharging pipe (3) and the second discharging pipe (4), a third discharging pneumatic valve (51) and a third sampling pipe (52) for detecting leakage are arranged on the third discharging pipe (5), and a third sampling pneumatic valve (44) is arranged on the third sampling pipe (52).

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