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CN-224216662-U - Online analysis device for gas oxygen content of interlayer of cold box

CN224216662UCN 224216662 UCN224216662 UCN 224216662UCN-224216662-U

Abstract

The utility model relates to the technical field of cold box interlayer gas oxygen content analysis, in particular to an online cold box interlayer gas oxygen content 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 the cold box interlayer gas 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 used for remotely switching and analyzing polluted nitrogen and the cold box interlayer gas, and the pretreatment box is connected between the three-way electromagnetic valve and the sampling pump. According to the utility model, through remote switching of the three-way electromagnetic valve and automatic logic setting of the DCS system, the online intelligent analysis of the gas-oxygen content of the interlayer of the cold box is realized, the accuracy and the efficiency of analysis are improved, and an operator can complete the analysis work of the polluted nitrogen and the interlayer gas of the cold box without frequently and manually switching the analysis instrument, so that the operation burden is reduced.

Inventors

  • Jia Tiantang
  • LUO JING
  • ZHANG YUYAN

Assignees

  • 中天合创能源有限责任公司

Dates

Publication Date
20260508
Application Date
20250326

Claims (8)

  1. 1. An online analysis device for the gas oxygen content of an interlayer of a cold box, which is characterized by comprising: a sampling pump (1) for introducing the cold box interlayer gas into the analysis device under pressure; An analysis meter (5) for analyzing the oxygen content of the pretreated gas; the three-way electromagnetic valve is arranged between the sampling pump (1) and the analysis instrument (5) and is used for remotely switching and analyzing the polluted nitrogen and the interlayer gas of the cold box; The pretreatment box (4) is connected between the three-way electromagnetic valve and the sampling pump (1) and is used for carrying out dust removal and water removal treatment on the introduced gas; and the control system is connected with the three-way electromagnetic valve and the analysis instrument (5) and is used for setting logic automatic switching analysis of the polluted nitrogen and the interlayer gas of the cold box, recording and storing analysis data, and triggering an alarm when the analysis data rises to a set value.
  2. 2. The online analysis device for the gas oxygen content of the interlayer of the cold box according to claim 1, wherein the analysis instrument (5) is an oxygen content analysis instrument.
  3. 3. The on-line analysis device for the gas-oxygen content of the interlayer of the cold box according to claim 1, wherein the three-way electromagnetic valve comprises a first electromagnetic valve (2) and a second electromagnetic valve (3), the first electromagnetic valve (2) is connected with the polluted nitrogen A or the polluted nitrogen B, the second electromagnetic valve (3) is connected with the polluted nitrogen A or the polluted nitrogen B or the interlayer gas C of the cold box, and the switching analysis among the polluted nitrogen A, the polluted nitrogen B and the interlayer gas C of the cold box is realized by controlling the electrifying states of the first electromagnetic valve (2) and the second electromagnetic valve (3).
  4. 4. The online analysis device for the interlayer gas oxygen content of the cold box according to claim 1, wherein a dust removal filter and a dehumidification device are arranged in the pretreatment box (4) and are used for dust removal and dehumidification treatment of the introduced gas.
  5. 5. The online analysis device for the gas oxygen content of the interlayer of the cold box according to claim 4, wherein the analysis instrument (5) is connected with a DCS system, and the DCS system automatically records and stores analysis data and triggers an alarm when the analysis data rises to a set value.
  6. 6. The online analysis device for the interlayer gas oxygen content of the cold box according to claim 1, wherein the pretreatment box (4) comprises a first box body (401), gas guide pipes (403) are fixedly connected to two sides of the first box body (401), 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 arranged on the inner wall of the first box body (401).
  7. 7. The on-line analysis device for the interlayer gas oxygen content of the cold box according to claim 6, wherein the pretreatment box (4) further comprises a second box body (404) arranged at the top of the first box body (401), a dryer (405) is arranged at the top of the second box body (404), an activated carbon adsorption plate (407) is arranged in the second box body (404), and the dryer (405) is used for drying the activated carbon adsorption plate (407).
  8. 8. The cold box interlayer gas oxygen content online analysis device according to claim 7, wherein two sides of each activated carbon adsorption plate (407) are fixedly connected with connecting plates (408), the outer walls of each connecting plate (408) are fixedly connected with toothed plates (409), each activated carbon adsorption plate (407), each connecting plate (408) and each toothed plate (409) penetrate through the top of a first box body (401) and are in sliding connection with the same, a rotating shaft (410) is rotatably connected to the inner wall of the first box body (401), gears (411) are fixedly connected to the outer walls of the rotating shafts (410), the gears (411) are meshed with the toothed plates (409), stepping motors (402) are fixedly connected to the outer walls of the first box bodies (401), and the ends of the rotating shafts (410) are fixedly connected with the output ends of the stepping motors (402).

Description

Online analysis device for gas oxygen content of interlayer of cold box Technical Field The utility model relates to the technical field of cold box interlayer gas oxygen content analysis, in particular to an online analysis device for cold box interlayer gas oxygen content. Background With the trend of large-scale centralized development of petrochemical industry and coal chemical industry, the importance of safe, stable and long-period running of the air separation device as a source of various petrochemical process flows is increasingly prominent. However, in recent years, the occurrence of over-leakage of cold boxes of multiple sets of air separation units in the industry brings great risk to safe and stable operation of the units, and in order to enhance the safety monitoring capability of the air separation units, online monitoring of the air separation units is required. The cold box interlayer gas generally uses polluted nitrogen or nitrogen, the oxygen content online analysis device in the prior art has the function of only realizing two-way analysis, the polluted nitrogen (A/B) is led to an oxygen content online analysis instrument through a three-way electromagnetic valve to detect the oxygen content in the gas, the detection function is relatively less, and the online detection of the cold box interlayer gas is not realized. Disclosure of utility model Based on the above-mentioned on-line analysis device for oxygen content in the prior art, the function can only realize two-way analysis, the dirty nitrogen (A/B) is led to the on-line analysis instrument for oxygen content through the three-way electromagnetic valve, so as to detect the oxygen content in the gas, the detection function is relatively less, and the on-line detection is not realized. The utility model provides an online analysis device for the gas oxygen content of a cold box interlayer, which comprises a sampling pump, a sampling device and a control device, wherein the sampling pump is used for introducing the cold box interlayer gas into the analysis device under pressure; an analysis meter for analyzing the oxygen content of 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 polluted nitrogen and the interlayer gas of the cold box; The pretreatment box is connected between the three-way electromagnetic valve and the sampling pump and is used for carrying out dust removal and water removal treatment on the introduced gas; And the control system is connected with the three-way electromagnetic valve and the analysis instrument, and is used for setting logic to automatically switch and analyze the waste nitrogen and the interlayer gas of the cold box, recording and storing analysis data, and triggering an alarm when the analysis data rises to a set value. Preferably, the analysis instrument is an existing analysis instrument for the oxygen content in the polluted nitrogen, and the original polluted nitrogen analysis and the online analysis of the interlayer gas oxygen content of the cold box are shared by switching the three-way electromagnetic valve. Preferably, the three-way electromagnetic valve comprises a first electromagnetic valve and a second electromagnetic valve, the first electromagnetic valve is connected with the polluted nitrogen A or the polluted nitrogen B, the second electromagnetic valve is connected with the polluted nitrogen A or the polluted nitrogen B or the cold box interlayer gas C, and switching analysis among the polluted nitrogen A, the polluted nitrogen B and the cold box interlayer gas C is realized by controlling the power-on states of the first electromagnetic valve and the second electromagnetic valve. Preferably, a dust removal filter and a dehumidifying device are arranged in the pretreatment box and are used for carrying out dust removal and dehumidifying treatment on the introduced gas so as to ensure accurate measurement of the analysis instrument. Preferably, the analysis instrument is connected with a DCS system, and the DCS system automatically records and stores analysis data and triggers an alarm when the analysis data rises to a set value. Preferably, the pretreatment box comprises a first box body, two sides of the first box body are fixedly connected with air ducts, the inner wall of the first box body is fixedly connected with a filter screen, and two activated carbon adsorption plates are arranged on the inner wall of the first box body. Preferably, the pretreatment box further comprises a second box body arranged at the top of the first box body, a dryer is arranged at the top of the second box body, the dryer is used for drying the activated carbon adsorption plates of the second box body, two activated carbon adsorption plates are fixedly connected with connecting plates on two sides, toothed plates are fixedly connected to the outer walls of the connecting plat