Process sampling connecting device for cold box interlayer sealing gas

Abstract

The utility model relates to industrial gas equipment, in particular to a process sampling connecting device for cold box interlayer sealing gas, which comprises a cold box interlayer fixedly communicated with an external pipe fitting, and further comprises a root valve, an inlet valve, an outlet valve and an outlet valve, the input end of the glass tube metal float flowmeter is fixedly communicated with the output end of the root valve; the input end of the detector analysis cup is fixedly communicated with the output end of the glass tube metal float flowmeter; the environmental oxygen detector is fixedly mounted on the port section of the first output end of the detector analysis cup, the environmental oxygen detector comprises a detection probe rod, the detection probe rod extends into an air passage in the detector analysis cup, and the end part of the detection probe rod is distributed close to the input end of the detector analysis cup; provided is a pipeline type exhaust fan. Continuous monitoring of sealing gas is achieved through the fixed environment oxygen detector, safety is improved, operation is easy and convenient, manual sampling is not needed, and workload is reduced.

Description

Technical Field

[0001] This utility model relates to industrial gas equipment, specifically to a process sampling connection device for sealing gas in the interlayer of a cold box. Background Technology

[0002] In air separation equipment, the cold box is one of the core components. Its interlayer is usually filled with a sealing gas (such as dry nitrogen) to maintain the internal low-temperature environment and prevent moisture from entering. Changes in the purity of the sealing gas (especially the oxygen content) are one of the key parameters for determining whether there are leaks in the equipment and pipelines inside the cold box. It is mainly used for necessary real-time monitoring and protection to ensure that the cold box is operating safely.

[0003] Currently, traditional methods for detecting sealing gases typically employ offline sampling and analysis, which has the following problems:

[0004] 1. Poor real-time performance: Offline sampling cannot reflect the state of the sealed gas in real time, which may lead to safety hazards.

[0005] 2. Complex operation: It requires manual sampling and sending to the laboratory for analysis, which increases workload and cost.

[0006] 3. Limited accuracy: Offline analysis is susceptible to environmental interference, and the detection results may contain errors.

[0007] In addition, online analysis using a magnetic oxygen trace analyzer is also an option used in engineering practice, but it also has the following problems:

[0008] 1. High cost: The magnetic oxygen trace oxygen analyzer itself is expensive, and the analyzer usually needs to be installed in an analyzer cabinet. In addition, the high price of its sensor consumables leads to high investment and maintenance costs.

[0009] 2. Difficulty in sampling pretreatment: Due to the low sealing gas pressure in the cold box interlayer, a booster pump is required to pressurize the gas so that the magnetic oxygen analyzer can work normally. However, adding a booster pump for suction may cause damage to the analyzer or blockage of the pipeline by drawing perlite into the analyzer.

[0010] Therefore, there is an urgent need for a device that can reliably sample, monitor in real time and continuously the sealing gas status of the cold box interlayer with low investment, so as to improve the safety and efficiency of equipment operation. Utility Model Content

[0011] The purpose of this invention is to provide a process sampling connection device for the sealing gas in the interlayer of a cold box, in order to solve the above-mentioned problems.

[0012] To achieve the above objectives, this utility model provides the following technical solution: a process sampling connection device for sealing gas in a cold box interlayer, comprising a cold box interlayer, on which an external pipe fitting is fixedly connected, and further comprising:

[0013] The root valve has its input end fixedly connected to the connecting pipe via a hose.

[0014] A glass tube metal float flow meter, the input end of which is fixedly connected to the output end of the root valve;

[0015] The detector analysis cup has its input end fixedly connected to the output end of the glass tube metal float flowmeter.

[0016] An ambient oxygen detector is fixedly installed on the port section of the first output end of the detector analysis cup. The ambient oxygen detector includes a detection probe that extends into the airway inside the detector analysis cup, with its end distributed near the input end of the detector analysis cup.

[0017] A duct-type exhaust fan is mounted on the second output port on the side wall of the detector analysis cup and is used to output the gas inside the detector analysis cup to the outside of the second output port.

[0018] Preferably, the maximum flow rate output by the root valve is 350±50 ml / min.

[0019] Preferably, the maximum flow rate output by the duct-type exhaust fan is 350±50ml / min.

[0020] Preferably, the duct-type exhaust fan is powered by a 24V DC power supply.

[0021] As a preferred embodiment, it also includes a first stainless steel sampling tube, with a first through threaded ferrule terminal connector fixedly installed at both ends of the tube.

[0022] The first stainless steel sampling tube is fixedly connected to the output end of the root valve and the input end of the glass tube metal float flowmeter through the first straight threaded ferrule terminal connectors at both ends.

[0023] As a preferred embodiment, a second stainless steel sampling tube is also included, with a second straight-through threaded ferrule terminal connector fixedly installed at both ends of the tube.

[0024] The second stainless steel sampling tube is fixedly connected to the output end of the glass tube metal float flowmeter and the input end of the detector analysis cup through the second straight threaded ferrule terminal connectors at both ends.

[0025] Preferably, a third straight-through threaded ferrule terminal connector is fixedly installed on both the input end of the duct exhaust fan and the second output port on the side wall of the detector analysis cup, and a connecting pipe is fixedly connected between the two third straight-through threaded ferrule terminal connectors.

[0026] Preferably, the connecting pipe is a flexible hose or a rigid polyethylene pipe.

[0027] In the above technical solution, the present invention provides a process sampling connection device for the sealing gas of a cold box interlayer, which has the following beneficial effects: When the entire sampling connection device is powered on, the duct exhaust fan starts to operate, and the suction causes the airflow to be discharged from the outer pipe fitting towards the output end of the duct exhaust fan. During the airflow process, it passes sequentially through the glass tube metal float flowmeter and the detector analysis cup, and the detection probe of the ambient oxygen detector is located inside the detector analysis cup, thereby detecting the oxygen concentration data in the sealing gas in real time. Wherein:

[0028] The glass tube metal float flow meter is used to detect and control the operating power of the duct exhaust fan, thereby achieving the purpose of dynamically adjusting the sealing airflow speed.

[0029] The aforementioned device is installed near the cold box, and the short sampling pipeline reduces analytical delays caused by excessively long analysis tubes. Compared to using a magnetic oxygen analyzer and manual sampling analysis, this significantly reduces costs. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Cold box jacket; 2. Root valve; 3. First through threaded ferrule terminal connector; 31. Second through threaded ferrule terminal connector; 32. Third through threaded ferrule terminal connector; 4. First stainless steel sampling tube; 41. Second stainless steel sampling tube; 5. Glass tube metal float flow meter; 6. Detector analysis cup; 7. Pipe exhaust fan; 8. Ambient oxygen detector. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, a process sampling connection device for sealing gas in a cold box includes a cold box interlayer 1, on which an external pipe fitting is fixedly connected, and further includes:

[0036] The root valve 2 has its inlet end fixedly connected to the connecting pipe fitting via a hose.

[0037] The glass tube metal float flowmeter 5 has its input end fixedly connected to the output end of the root valve 2;

[0038] The detector analysis cup 6 has its input end fixedly connected to the output end of the glass tube metal float flowmeter 5;

[0039] An ambient oxygen detector 8 is fixedly installed on the port section of the first output end of the detector analysis cup 6. The ambient oxygen detector 8 includes a detection probe that extends into the airway inside the detector analysis cup 6, and its end (the end of the detection probe) is distributed close to the input end of the detector analysis cup 6.

[0040] A duct-type exhaust fan 7 is mounted on the second output port on the side wall of the detector analysis cup 6 and is used to output the gas inside the detector analysis cup 6 to the outside of the second output port.

[0041] Specifically, the ambient oxygen detector 8 is used to detect the oxygen concentration in the sealed gas in real time and transmit the data to the control system. The control system is actually the data receiving system, which receives the network data transmitted by the ambient oxygen detector 8, converts / processes it to form visualized data, and displays it on the screen.

[0042] Secondly, the cables of the aforementioned glass tube metal float flowmeter 5, ambient oxygen detector 8, and duct exhaust fan 7 are all connected to the air switch to be powered by 220V AC mains.

[0043] It should be noted that the electronic components and electronic control programs mentioned above are all common technical knowledge known to those skilled in the art, and therefore will not be described in detail.

[0044] In the above technology, after the entire sampling connection device is powered on, the duct exhaust fan 7 starts operating, drawing airflow from the external pipe fitting towards the output end of the duct exhaust fan 7. During the airflow process, it passes sequentially through the glass tube metal float flowmeter 5 and the detector analysis cup 6, while the detection probe of the ambient oxygen detector 8 is located inside the detector analysis cup 6, thereby real-time monitoring of the oxygen concentration data in the sealed gas. Wherein:

[0045] The glass tube metal float flow meter 5 is used to detect and control the operating power of the duct exhaust fan 7, thereby achieving the purpose of dynamically adjusting the sealing airflow speed.

[0046] The aforementioned device is installed near the cold box, and the short sampling pipeline reduces analytical delays caused by excessively long analysis tubes. Compared to using a magnetic oxygen analyzer and manual sampling analysis, this significantly reduces costs.

[0047] As a further embodiment of the utility model, the maximum flow rate output by the root valve 2 is 350±50 ml / min. And the maximum flow rate output by the duct-type exhaust fan 7 is 350±50 ml / min.

[0048] Specifically, the root valve 2 mentioned above is a solenoid valve. The operation of the solenoid valve and the duct exhaust fan 7 is dynamically controlled by the airflow signal detected by the glass tube metal float flow meter 5, thereby adjusting the sealing airflow speed to 350±50ml / min to ensure that the ambient oxygen detector 8 works in the optimal state.

[0049] It should be noted that the aforementioned duct-type exhaust fan 7 is powered by a 24V DC power supply.

[0050] As a further embodiment of the utility model, the first stainless steel sampling tube 4 is fixedly installed with a first through threaded ferrule terminal connector 3 at both ends, and the first stainless steel sampling tube 4 is fixedly connected to the output end of the root valve 2 and the input end of the glass tube metal float flowmeter 5 through the first through threaded ferrule terminal connectors 3 at both ends.

[0051] Specifically, the first straight-through threaded ferrule terminal connector 3 mentioned above can be made of plastic or aluminum alloy. Since the straight-through threaded ferrule terminal connector is a common flange connection device and is common knowledge, the specific model will not be described in detail.

[0052] As a further embodiment of the utility model, the two ends of the second stainless steel sampling tube 41 are respectively fixedly installed with second straight threaded ferrule terminal connectors 31, and the second stainless steel sampling tube 41 is fixedly connected to the output end of the glass tube metal float flowmeter 5 and the input end of the detector analysis cup 6 through the second straight threaded ferrule terminal connectors 31 at both ends.

[0053] Specifically, the aforementioned second straight-through threaded ferrule terminal connector 31 can be made of either plastic or aluminum alloy.

[0054] In a further embodiment of the utility model, a third straight-through threaded ferrule terminal connector 32 is fixedly installed on both the input end of the duct-type exhaust fan 7 and the second output port on the side wall of the detector analysis cup 6. A connecting pipe is fixedly connected between the two third straight-through threaded ferrule terminal connectors 32. The connecting pipe is a flexible hose or a rigid polyethylene pipe.

[0055] It should be noted that the above-mentioned fixed connection uses a known pipe connection structure, such as a flange or threaded pipe joint, while the fixed connection is welding.

[0056] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A process sampling connection device for sealing gas in a cold box interlayer, comprising a cold box interlayer (1) to which an external pipe fitting is fixedly connected, characterized in that, Also includes: The root valve (2) has its input end fixedly connected to the connecting pipe via a hose; The glass tube metal float flowmeter (5) has its input end fixedly connected to the output end of the root valve (2); The detector analysis cup (6) has its input end fixedly connected to the output end of the glass tube metal float flowmeter (5); An ambient oxygen detector (8) is fixedly installed on the port section of the first output end of the detector analysis cup (6). The ambient oxygen detector (8) includes a detection probe that extends into the airway inside the detector analysis cup (6) and has its end distributed close to the input end of the detector analysis cup (6). A duct-type exhaust fan (7) is mounted on the second output port on the side wall of the detector analysis cup (6) and is used to output the gas inside the detector analysis cup (6) to the outside of the second output port.

2. The process sampling connection device for sealing gas in a cold box jacket according to claim 1, characterized in that, The maximum flow rate output by the root valve (2) is 350±50 ml / min.

3. The process sampling connection device for sealing gas in a cold box interlayer according to claim 1, characterized in that, The maximum flow rate output by the duct-type exhaust fan (7) is 350±50ml / min.

4. The process sampling connection device for sealing gas in a cold box interlayer according to claim 1, characterized in that, The duct-type exhaust fan (7) is powered by a 24V DC power supply.

5. A process sampling connection device for sealing gas in a cold box interlayer according to claim 1, characterized in that, It also includes a first stainless steel sampling tube (4), with a first through threaded ferrule terminal connector (3) fixedly installed at both ends; The first stainless steel sampling tube (4) is fixedly connected to the output end of the root valve (2) and the input end of the glass tube metal float flow meter (5) through the first straight threaded ferrule terminal connectors (3) at both ends.

6. The process sampling connection device for sealing gas in a cold box interlayer according to claim 1, characterized in that, It also includes a second stainless steel sampling tube (41), with a second straight threaded ferrule terminal connector (31) fixedly installed at both ends; The second stainless steel sampling tube (41) is fixedly connected to the output end of the glass tube metal float flowmeter (5) and the input end of the detector analysis cup (6) through the second straight threaded ferrule terminal connectors (31) at both ends.

7. The process sampling connection device for sealing gas in a cold box jacket according to claim 1, characterized in that, A third straight-through threaded ferrule terminal connector (32) is fixedly installed on the input end of the duct exhaust fan (7) and the second output port on the side wall of the detector analysis cup (6), and a connecting pipe is fixedly connected between the two third straight-through threaded ferrule terminal connectors (32).

8. A process sampling connection device for sealing gas in a cold box interlayer according to claim 7, characterized in that, The connecting pipe is a flexible hose or a rigid polyethylene pipe.

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