Online analysis device for oxygen content of interlayer gas of cold box

Abstract

The utility model relates to the technical field of cold box interlayer gas oxygen content analysis, in particular to a cold box interlayer gas oxygen content on-line analysis device which comprises a sampling pump, a three-way electromagnetic valve, a pretreatment box, an analysis instrument and a control system, wherein the sampling pump is used for pressurizing and introducing interlayer gas of the cold box into the analysis device; the analysis instrument is used for analyzing the oxygen content in the pretreated gas; the three-way electromagnetic valve is arranged between the sampling pump and the analysis instrument and is used for remotely switching and analyzing the waste nitrogen and the cold box interlayer gas; the pretreatment box is connected between the three-way electromagnetic valve and the sampling pump. Through remote switching of the three-way solenoid valve and automatic logic setting of the DCS, online intelligent analysis of the oxygen content of the interlayer gas of the cold box is achieved, and the analysis accuracy and efficiency are improved; and an operator can finish the analysis work of the waste nitrogen and the interlayer gas of the cold box without frequently and manually switching an analysis instrument, so that the operation burden is reduced.

Description

Technical Field

[0001] This utility model relates to the field of oxygen content analysis technology in cold box interlayer gas, and more specifically, to an online analysis device for oxygen content in cold box interlayer gas. Background Technology

[0002] With the trend towards large-scale and centralized development in the petrochemical and coal chemical industries, the importance of air separation units, as the source of various petrochemical processes, for safe, stable, and long-term operation is becoming increasingly prominent. However, in recent years, several air separation units in the industry have experienced cold box leakage incidents, posing significant risks to the safe and stable operation of the units. To enhance the safety monitoring capabilities of air separation units, online monitoring of these units is necessary.

[0003] The gas used in the interlayer of a cold box is generally sludge nitrogen or nitrogen. The existing online oxygen content analysis device can only perform two-way analysis. It leads the sludge nitrogen (A / B) to the online oxygen content analysis instrument through a three-way solenoid valve to detect the oxygen content in the gas. Its detection function is relatively limited and it does not realize online detection of the gas in the interlayer of the cold box. Utility Model Content

[0004] Based on the aforementioned existing online oxygen content analyzer, which only performs two-way analysis by introducing polluted nitrogen gas (A / B) to the online oxygen content analyzer via a three-way solenoid valve to detect the oxygen content in the gas, this invention proposes an online oxygen content analyzer for cold box interlayer gas.

[0005] This utility model proposes an online analysis device for the oxygen content of cold box interlayer gas, which includes a sampling pump for pressurizing the cold box interlayer gas and introducing it into the analysis device.

[0006] Analytical instruments used to analyze the oxygen content in pretreated gases;

[0007] A three-way solenoid valve is installed between the sampling pump and the analytical instrument to remotely switch between the analytical waste nitrogen gas and the cold box jacket gas.

[0008] The pretreatment box, connected between the three-way solenoid valve and the sampling pump, is used to treat the introduced gas for dust and water removal.

[0009] The system is connected to a three-way solenoid valve and an analytical instrument. It is used to set logic to automatically switch between analyzing polluted nitrogen and cold box interlayer gas, and to record and save the analytical data. When the analytical data rises to a set value, an alarm is triggered.

[0010] Preferably, the analytical instrument is an existing oxygen content analyzer for waste nitrogen, and the original waste nitrogen analysis and the online analysis of oxygen content in the cold box jacket are shared by switching the three-way solenoid valve.

[0011] Preferably, the three-way solenoid valve includes a first solenoid valve and a second solenoid valve. The first solenoid valve is connected to either polluted nitrogen A or polluted nitrogen B, and the second solenoid valve is connected to either polluted nitrogen A or polluted nitrogen B or cold box interlayer gas C. By controlling the energization state of the first and second solenoid valves, the switching analysis between polluted nitrogen A, polluted nitrogen B and cold box interlayer gas C can be realized.

[0012] Preferably, the pretreatment box is equipped with a dust filter and a dehumidification device to remove dust and dehumidify the introduced gas, so as to ensure the accurate measurement of the analytical instruments.

[0013] Preferably, the analytical instrument is connected to a DCS system, which automatically records and saves the analytical data and triggers an alarm when the analytical data rises to a set value.

[0014] Preferably, the pretreatment box includes a first box body, with air guide pipes fixedly connected to both sides of the first box body, a filter screen fixedly connected to the inner wall of the first box body, and two activated carbon adsorption plates installed on the inner wall of the first box body.

[0015] Preferably, the pretreatment box further includes a second box installed on top of the first box. A dryer is installed on top of the second box, and the dryer is used to dry the activated carbon adsorption plates of the second box. Connecting plates are fixedly connected to both sides of the two activated carbon adsorption plates. Toothed plates are fixedly connected to the outer walls of the connecting plates. The activated carbon adsorption plates, connecting plates, and toothed plates pass through the top of the first box and are slidably connected thereto. A rotating shaft is rotatably connected to the inner wall of the first box. A gear is fixedly connected to the outer wall of the rotating shaft. The gear meshes with the toothed plate. A stepper motor is fixedly connected to the outer wall of the first box. The end of the rotating shaft is fixedly connected to the output end of the stepper motor.

[0016] The beneficial effects of this utility model, achieved through the above technical solution, are as follows:

[0017] 1. Through remote switching of the three-way solenoid valve and automatic logic setting of the DCS system, online intelligent analysis of oxygen content in the cold box jacket gas is realized, improving the accuracy and efficiency of the analysis; and operators can complete the analysis of waste nitrogen and cold box jacket gas without frequently switching the analysis instruments, reducing the operational burden.

[0018] 2. The stepper motor drives the gear to rotate through the shaft, which in turn drives the two activated carbon adsorption plates to move synchronously in opposite directions through the toothed plate, realizing the switching of the two activated carbon adsorption plates. The activated carbon adsorption plates in the first box are moved to the second box, and the activated carbon adsorption plates are dried by the dryer so that they can be reused. Attached Figure Description

[0019] Figure 1 This is a system diagram of the present utility model;

[0020] Figure 2 This is a schematic diagram of the pretreatment box structure of this utility model;

[0021] Figure 3 This is a cross-sectional view of the pretreatment box structure of this utility model.

[0022] In the diagram: 1. Sampling pump; 2. First solenoid valve; 3. Second solenoid valve; 4. Pretreatment box; 401. First chamber; 402. Stepper motor; 403. Air guide pipe; 404. Second chamber; 405. Dryer; 406. Filter screen; 407. Activated carbon adsorption plate; 408. Connecting plate; 409. Toothed plate; 410. Rotating shaft; 411. Gear; 5. Analytical instrument;

[0023] A - Waste nitrogen gas A; B - Waste nitrogen gas B; C - Cold box interlayer gas. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] like Figure 1 As shown, an online oxygen content analysis device for the interlayer gas of a cold box includes a sampling pump 1, a three-way solenoid valve, a pretreatment box 4, an analysis instrument 5, and a control system.

[0027] Among them, sampling pump 1 is used to pressurize the gas in the cold box interlayer and introduce it into the analysis device;

[0028] Analytical instrument 5 is used to analyze the oxygen content in pretreated gas;

[0029] A three-way solenoid valve is located between sampling pump 1 and analytical instrument 5, and is used to remotely switch between analyzing polluted nitrogen gas and cold box interlayer gas.

[0030] The pretreatment box 4 is connected between the three-way solenoid valve and the sampling pump 1 and is used to remove dust and water from the introduced gas.

[0031] The control system is connected to a three-way solenoid valve and an analysis instrument 5. It is used to set logic to automatically switch between analyzing polluted nitrogen and cold box interlayer gas, and to record and save the analysis data. When the analysis data rises to the set value, an alarm is triggered.

[0032] like Figure 1 As shown, analyzer 5 is an existing analyzer for oxygen content in waste nitrogen. By switching the three-way solenoid valve, the original waste nitrogen analysis and the online analysis of oxygen content in the cold box jacket are shared.

[0033] like Figure 1 As shown, the three-way solenoid valve includes a first solenoid valve 2 and a second solenoid valve 3. The first solenoid valve 2 is connected to either polluted nitrogen A or polluted nitrogen B, and the second solenoid valve 3 is connected to either polluted nitrogen A or polluted nitrogen B or cold box interlayer gas C. By controlling the energization state of the first solenoid valve 2 and the second solenoid valve 3, the switching analysis between polluted nitrogen A, polluted nitrogen B and cold box interlayer gas C can be realized.

[0034] like Figure 1 As shown, the pretreatment box 4 is equipped with a dust filter and a dehumidification device to remove dust and dehumidify the introduced gas, so as to ensure the accurate measurement of the analysis instrument 5.

[0035] like Figure 1 As shown, the analytical instrument 5 is connected to the DCS system. The DCS system automatically records and saves the analytical data and triggers an alarm when the analytical data rises to a set value.

[0036] like Figure 1 As shown, when solenoid valve 3 is energized, the cold box interlayer gas C enters the existing online nitrogen and oxygen content analyzer 5 through the pretreatment box 4 for analysis; when solenoid valve 3 is de-energized, solenoid valve 2 is de-energized, and at this time, the polluted nitrogen gas A enters the analyzer 5 for analysis; when solenoid valve 3 is de-energized, solenoid valve 2 is energized, and at this time, the analysis is switched to polluted nitrogen gas B; through this design, the alternating analysis function of polluted nitrogen gas and cold box interlayer gas is realized.

[0037] like Figure 1 As shown, operators can set the logic parameters of the DCS system according to actual needs. The logic is set to automatically switch the oxygen content analyzer in the nitrogen waste gas to analyze the oxygen content in the cold box jacket gas for 15 minutes every 4 hours. In this way, the DCS system can automatically record and save the analysis data and trigger an alarm in time when the data is abnormal.

[0038] like Figure 2 and Figure 3 As shown, the pretreatment box 4 includes a first box body 401, with air guide pipes 403 fixedly connected to both sides of the first box body 401, a filter screen 406 fixedly connected to the inner wall of the first box body 401, and two activated carbon adsorption plates 407 installed on the inner wall of the first box body 401.

[0039] The pretreatment box 4 also includes a second box 404 installed on top of the first box 401. A dryer 405 is installed on top of the second box 404. The dryer 405 is used to dry the activated carbon adsorption plates 407 of the second box 404. Connecting plates 408 are fixedly connected to both sides of the two activated carbon adsorption plates 407. Toothed plates 409 are fixedly connected to the outer walls of the connecting plates 408. The activated carbon adsorption plates 407, connecting plates 408 and toothed plates 409 respectively pass through the top of the first box 401 and are slidably connected thereto. A rotating shaft 410 is rotatably connected to the inner wall of the first box 401. A gear 411 is fixedly connected to the outer wall of the rotating shaft 410. The gear 411 meshes with the toothed plates 409. A stepper motor 402 is fixedly connected to the outer wall of the first box 401. The end of the rotating shaft 410 is fixedly connected to the output end of the stepper motor 402.

[0040] The air ducts 403 on both sides of the first chamber 401 are connected to the sampling pump 1 and the second solenoid valve 3 respectively. The sampling pump 1 delivers the cold box interlayer gas C to the first chamber 401. The dust in the gas is filtered by the filter screen 406 and the moisture in the gas is adsorbed by the activated carbon adsorption plate 407, thereby achieving the effect of dehumidification and dust removal.

[0041] After testing, the stepper motor 402 drives the gear 411 to rotate via the shaft 410, which in turn drives the two activated carbon adsorption plates 407 to move synchronously in opposite directions via the toothed plate 409, thereby enabling the switching of the two activated carbon adsorption plates 407. The activated carbon adsorption plates 407 in the first box 401 are moved to the second box 404, and the activated carbon adsorption plates 407 are dried by the dryer 405 so that they can be reused.

[0042] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An online oxygen content analysis device for the interlayer gas of a cold box, characterized in that, include: Sampling pump (1) is used to pressurize the gas in the cold box jacket and introduce it into the analysis device; Analytical instrument (5) is used to analyze the oxygen content in the pretreated gas; A three-way solenoid valve is installed between the sampling pump (1) and the analytical instrument (5) for remotely switching between the analytical waste nitrogen gas and the cold box interlayer gas. The pretreatment box (4) is connected between the three-way solenoid valve and the sampling pump (1) and is used to treat the introduced gas for dust and water removal. The system is connected to a three-way solenoid valve and an analytical instrument (5) to set logic for automatic switching between analyzing polluted nitrogen and cold box interlayer gas, and to record and save analytical data. An alarm is triggered when the analytical data rises to a set value.

2. The online oxygen content analysis device for the interlayer of a cold box according to claim 1, characterized in that: The analytical instrument (5) is an oxygen content analyzer.

3. The online oxygen content analysis device for the interlayer gas of a cold box according to claim 1, characterized in that: The three-way solenoid valve includes a first solenoid valve (2) and a second solenoid valve (3). The first solenoid valve (2) is connected to either polluted nitrogen A or polluted nitrogen B, and the second solenoid valve (3) is connected to either polluted nitrogen A or polluted nitrogen B or cold box interlayer gas C. By controlling the energization state of the first solenoid valve (2) and the second solenoid valve (3), the switching analysis between polluted nitrogen A, polluted nitrogen B and cold box interlayer gas C can be realized.

4. The online oxygen content analysis device for the interlayer gas of a cold box according to claim 1, characterized in that: The pretreatment box (4) is equipped with a dust filter and a dehumidification device for dust removal and dehumidification of the introduced gas.

5. The online oxygen content analysis device for the interlayer gas of a cold box according to claim 4, characterized in that: The analytical instrument (5) is connected to the DCS system. The DCS system automatically records and saves the analytical data and triggers an alarm when the analytical data rises to a set value.

6. The online oxygen content analysis device for the interlayer gas of a cold box according to claim 1, characterized in that: The pretreatment box (4) includes a first box body (401), on both sides of the first box body (401) are fixedly connected to air guide pipes (403), a filter screen (406) is fixedly connected to the inner wall of the first box body (401), and two activated carbon adsorption plates (407) are installed on the inner wall of the first box body (401).

7. The online oxygen content analysis device for the interlayer gas of a cold box according to claim 6, characterized in that: The pretreatment box (4) also includes a second box (404) installed on top of the first box (401). A dryer (405) is installed on top of the second box (404). An activated carbon adsorption plate (407) is provided inside the second box (404). The dryer (405) is used to dry the activated carbon adsorption plate (407).

8. The online oxygen content analysis device for the interlayer gas of a cold box according to claim 7, characterized in that: A connecting plate (408) is fixedly connected to both sides of the two activated carbon adsorption plates (407). A toothed plate (409) is fixedly connected to the outer wall of the connecting plate (408). The activated carbon adsorption plates (407), connecting plates (408) and toothed plates (409) pass through the top of the first box (401) and are slidably connected thereto. A rotating shaft (410) is rotatably connected to the inner wall of the first box (401). A gear (411) is fixedly connected to the outer wall of the rotating shaft (410). The gear (411) meshes with the toothed plate (409). A stepper motor (402) is fixedly connected to the outer wall of the first box (401). The end of the rotating shaft (410) is fixedly connected to the output end of the stepper motor (402).

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