An online detection system for carbon dioxide content in converter gas

Abstract

This utility model discloses an online detection system for carbon dioxide content in converter gas, belonging to the field of online sampling and detection technology. It includes a sample gas detection pipeline, which sequentially connects the gas to be tested pipeline, a root valve, a sampling stop valve, a first pressure reducing valve, a first three-way valve, a flow meter, and the inlet of the measuring cell of a laser gas analyzer. The exhaust port of the measuring cell of the laser gas analyzer is connected to the inlet of a jet pump. The sample gas detection pipeline is sequentially covered with an electric heating tape and a thermal insulation layer. The online detection system for carbon dioxide content in converter gas provided by this utility model has a reasonable structural design and advantages such as continuous online sampling and analysis, simple operation, reduced corrosion of pipelines and instruments, and high accuracy and timeliness of detection data. The sample gas is depressurized, heated, and then enters the laser gas analyzer. The converter gas does not liquefy during the low-pressure, high-temperature sample gas detection pipeline transport process, resulting in fast response and high detection sensitivity.

Description

Technical Field

[0001] The utility model relates to an online detection system for carbon dioxide content in converter gas, belonging to the technical field of online sampling detection. Background Art

[0002] The large amount of tail gas emitted by the traditional steel industry is commonly known as "steel mill tail gas", which mainly includes "three gases" - coke oven gas, converter gas and blast furnace gas. The main components of the "three gases" are carbon monoxide and hydrogen. The efficient and comprehensive utilization of these gases is one of the breakthroughs for the steel industry to achieve energy conservation and consumption reduction and low-carbon emission reduction.

[0003] The converter gas is treated by dust removal, compression, desulfurization, deoxygenation, decarbonization purification and CO purification process, so that the total sulfur, oxygen and carbon dioxide content in the CO product gas is less than 0.1ppm, 50ppm and 100ppm respectively, meeting the requirements of chemical applications for CO. The current method of detecting the carbon dioxide content in the converter gas is to manually sample and send it to gas chromatography for detection, which is time-consuming and the data obtained cannot reflect the carbon dioxide content in the converter gas in real time, and the sampling gas bladder is easily damaged and leaked. Therefore, in order to monitor the changes in the carbon dioxide content in the converter gas in real time, it is necessary to add an online detection system to save manpower and obtain more accurate and effective data.

[0004] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility Model Content

[0005] In order to solve the problems existing in the prior art, the utility model provides an online detection system for carbon dioxide content in converter gas, which has the advantages of continuous online sampling and analysis, simple operation, reduced corrosion of pipelines and instruments, and high detection data accuracy and timeliness.

[0006] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0007] An online detection system for carbon dioxide content in converter gas comprises a sample gas detection pipeline, wherein the sample gas detection pipeline sequentially connects a gas pipeline to be tested, a root valve, a sampling stop valve, a first pressure reducing valve, a first three-way valve, a flow meter, and an air inlet of a measuring cell of a laser gas analyzer, wherein the exhaust port of the measuring cell of the laser gas analyzer is connected to an inlet of a jet pump, and the outlet of the jet pump is connected to an exhaust gas discharge pipeline;

[0008] The sample gas detection pipeline is coated with an electric heating tape and a thermal insulation layer in sequence.

[0009] The utility model provides an online detection system for the carbon dioxide content in converter gas, which also comprises an instrument air pipeline, which connects the instrument air main pipe, the filter pressure reducing valve, the second pressure reducing valve, the filter, the needle stop valve and the laser gas analyzer.

[0010] Optionally, the instrument air pipeline is connected in parallel with a first branch pipeline downstream of the filter pressure reducing valve, and the first branch pipeline is connected to the sample gas detection pipeline between the first pressure reducing valve and the first three-way valve after passing through a first two-way valve.

[0011] Optionally, the instrument air pipeline is further connected in parallel with a second branch pipeline downstream of the filter pressure reducing valve, and the second branch pipeline is connected to the inlet of the jet pump after passing through a third pressure reducing valve.

[0012] Optionally, the first three-way valve is also connected to a zero gas interface and a range gas interface via a second three-way valve.

[0013] Optionally, a second two-way valve is further provided on the sample gas detection pipeline between the sampling stop valve and the first pressure reducing valve, and a third two-way valve is further provided on the sample gas detection pipeline between the first three-way valve and the flow meter.

[0014] Optionally, the root valve is a welded stop valve, the flow meter is a flow meter with a needle valve, and the laser gas analyzer is provided with an alarm.

[0015] The beneficial effects of this application include but are not limited to:

[0016] The utility model provides an online detection system for the carbon dioxide content in converter gas, which has a reasonable structural design, has the advantages of continuous online sampling and analysis, simple operation, reduced corrosion of pipelines and instruments, and has high detection data accuracy and timeliness.

[0017] Specifically, on the sample gas detection pipeline, the sample gas is depressurized by the first pressure reducing valve, and is heated by the heating belt to enter the laser gas analyzer. The converter gas is not liquefied during the transportation process of the low-pressure and high-temperature sample gas detection pipeline, and the response speed is fast and the detection sensitivity is high.

[0018] A filter is added to the instrument air pipeline. On the basis of cleaning the pipeline and the laser gas analyzer measuring cell, it also removes impurities and moisture in the purge gas, effectively extending the service life of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1A schematic diagram of an online detection system for carbon dioxide content in converter gas provided by the utility model;

[0021] In the figure, 1, the gas pipeline to be tested; 2, the instrument air main; 100, the sample gas detection pipeline; 110, the root valve; 120, the sampling stop valve; 130, the first pressure reducing valve; 140, the first three-way valve; 150, the flow meter; 160, the laser gas analyzer; 170, the jet pump; 180, the exhaust pipeline; 191, the second two-way valve; 192, the third two-way valve; 200, the instrument air pipeline; 210, the filter pressure reducing valve; 220, the second pressure reducing valve; 230, the filter; 240, the needle stop valve; 300, the first branch pipeline; 310, the first two-way valve; 400 the second branch pipeline; 410, the third pressure reducing valve; 510, the second three-way valve; 520, the zero gas interface; 530, the range gas interface; 600, the third branch pipeline; 610, the fourth two-way valve; 700, the electric heating belt. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0023] It should be noted that many specific details are described in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0024] like Figure 1 As shown in the figure, the online detection system of carbon dioxide content in converter gas provided by the utility model includes a sample gas detection pipeline 100, which connects the gas pipeline 1 to be tested, the root valve 110, the sampling stop valve 120, the first pressure reducing valve 130, the first three-way valve 140, the flow meter 150, and the gas inlet of the measuring cell of the laser gas analyzer 160 in sequence, the exhaust port of the measuring cell of the laser gas analyzer 160 is connected to the inlet of the jet pump 170, and the outlet of the jet pump 170 is connected to the exhaust gas emission pipeline 180.

[0025] Furthermore, the online detection system provided by the utility model also includes an instrument air pipeline 200, which connects the instrument air main pipe 2, the filter pressure reducing valve 210, the second pressure reducing valve 220, the filter 230, the needle stop valve 240, and the laser gas analyzer 160.

[0026] The instrument air pipeline 200 is connected in parallel with a first branch pipeline 300 downstream of the filter pressure reducing valve 210 . The first branch pipeline 300 is connected to the sample gas detection pipeline 100 between the first pressure reducing valve 130 and the first three-way valve 140 after passing through the first two-way valve 310 .

[0027] The instrument air pipeline 200 is also connected in parallel with a second branch pipeline 400 downstream of the filter pressure reducing valve 210. The second branch pipeline 400 is connected to the inlet of the jet pump 170 after passing through the third pressure reducing valve 410 for purging the jet pump 170 and the pipeline.

[0028] Furthermore, the first three-way valve 140 is also connected to two standard gas inlets, namely the zero point gas interface 520 and the range gas interface 530, via the second three-way valve 510. The reserved zero point gas interface 520 and the range gas interface 530 can be temporarily connected to the standard gas for analyzer calibration to correct the zero drift of the analyzer in time.

[0029] Furthermore, a second two-way valve 191 is provided on the sample gas detection pipeline 100 between the sampling stop valve 120 and the first pressure reducing valve 130 , and a third two-way valve 192 is provided on the sample gas detection pipeline 100 between the first three-way valve 140 and the flow meter 150 .

[0030] Furthermore, the online detection system provided by the utility model also includes a third branch pipeline 600, one end of the third branch pipeline 600 is connected to the sample gas detection pipeline 100 between the first three-way valve 140 and the third two-way valve 192, and the other end is connected to the gas inlet of the measuring cell of the laser gas analyzer 160, and a fourth two-way valve 610 is arranged on the third branch pipeline 600.

[0031] The sample gas detection pipeline 100 is coated with an electric heating tape 700 and a thermal insulation layer in sequence, which are used to heat and insulate the sample gas in the sample gas detection pipeline 100 .

[0032] In one specific embodiment, the root valve 110 is a welded stop valve, the flow meter 150 is a flow meter with a needle valve, and the filter 230 is a T-type filter. The laser gas analyzer 160 is provided with an alarm, which can be a buzzer.

[0033] Specifically, the laser gas analyzer 160 adopts conventional equipment in the prior art, and each module is designed in an integrated manner, with a compact structure, convenient operation and maintenance, and the module functions can be replaced on site. Specifically, the laser gas analyzer is composed of a laser emission module, a gas chamber, a photoelectric sensor module, an analysis control module, and a measuring cell. The light beam emitted by the laser emission module passes through the gas chamber and is received by the detector in the photoelectric sensor module installed in the opposite direction. The analysis control module collects and analyzes the obtained measurement signal to obtain the concentration of the measured gas. If additional detection items are added later to detect the oxygen content and hydrogen sulfide content in the converter gas, the module information can be changed or modules can be added.

[0034] In one specific embodiment, the first two-way valve 310, the second two-way valve 191, the third two-way valve 192, the first three-way valve 140, the second three-way valve 510, etc. are all ball valves, and the material is 316 stainless steel;

[0035] The first pressure reducing valve 130, the second pressure reducing valve 220, and the third pressure reducing valve 140 are double ferrule ball valves made of 316 stainless steel;

[0036] The sample gas detection pipeline 100 , the first branch pipeline 300 , and the first branch pipeline 300 are all made of 316SS material.

[0037] The working process of the online detection system provided by the utility model is as follows:

[0038] The sample gas in the gas pipeline 1 to be tested passes through the root valve 110, the sampling stop valve 120, the first pressure reducing valve 130, the first three-way valve 140, and the flow meter 150 and then enters the measuring cell air inlet of the laser gas analyzer 160. The light beam emitted by the laser emission module passes through the gas chamber of the measuring cell and is received by the detector in the photoelectric sensor module installed in the opposite direction. The analysis and control module collects and analyzes the obtained measurement signal to obtain the concentration of the gas to be tested. The excess sample gas after the analysis is completed is sent out through the jet pump 170 and enters the exhaust gas exhaust pipeline 180 for recovery.

[0039] When the laser gas analyzer 160 needs to be recalibrated after running for a period of time, the sampling stop valve 120 is closed to cut off the sample gas, and the first three-way valve 140 is turned to the calibration gas inlet, and the zero point gas and the span gas are respectively connected for calibration.

[0040] Before and after starting and stopping, it is necessary to close the second two-way valve 191 and the first pressure reducing valve 130, open the filter pressure reducing valve 210, the first two-way valve 310, the second pressure reducing valve 220, and the needle stop valve 240 on the instrument air pipeline 200, and allow nitrogen to enter the first branch pipeline 300, the sample gas detection pipeline 100 and the laser gas analyzer 160 for purging to prevent excess sample gas from remaining in the pipeline and the laser gas analyzer 160 after the external gas supply stops, and corroding the instruments and pipelines.

[0041] In one specific application scenario, the gas pipeline 1 to be tested is a PSA section gas pipeline.

[0042] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The above specific implementation manner cannot be used as a limitation on the protection scope of the utility model. For technicians in this technical field, any replacement, improvement or transformation made to the implementation manner of the utility model falls within the protection scope of the utility model.

[0045] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. An online detection system for carbon dioxide content in converter gas, characterized in that: It includes a sample gas detection pipeline, which sequentially connects the gas pipeline to be tested, a root valve, a sampling stop valve, a first pressure reducing valve, a first three-way valve, a flow meter, and a gas inlet of a measuring cell of a laser gas analyzer, the exhaust port of the measuring cell of the laser gas analyzer is connected to the inlet of a jet pump, and the outlet of the jet pump is connected to an exhaust gas emission pipeline; The sample gas detection pipeline is coated with an electric heating tape and a thermal insulation layer in sequence.

2. The on-line detection system for carbon dioxide content in converter gas according to claim 1, characterized in that: It also includes an instrument air pipeline, which connects the instrument air main pipe, the filter pressure reducing valve, the second pressure reducing valve, the filter, the needle stop valve, and the laser gas analyzer.

3. The on-line detection system for carbon dioxide content in converter gas according to claim 2, characterized in that: The instrument air pipeline is connected in parallel with a first branch pipeline downstream of the filter pressure reducing valve. The first branch pipeline is connected to the sample gas detection pipeline between the first pressure reducing valve and the first three-way valve after passing through a first two-way valve.

4. The on-line detection system for carbon dioxide content in converter gas according to claim 2, characterized in that: The instrument air pipeline is also connected in parallel with a second branch pipeline downstream of the filter pressure reducing valve. The second branch pipeline is connected to the inlet of the jet pump after passing through the third pressure reducing valve.

5. The on-line detection system for carbon dioxide content in converter gas according to claim 1, characterized in that: The first three-way valve is also connected to the zero gas interface and the span gas interface via the second three-way valve.

6. The on-line detection system for carbon dioxide content in converter gas according to claim 1, characterized in that: A second two-way valve is also provided on the sample gas detection pipeline between the sampling stop valve and the first pressure reducing valve, and a third two-way valve is also provided on the sample gas detection pipeline between the first three-way valve and the flow meter.

7. The on-line detection system for carbon dioxide content in converter gas according to claim 2, characterized in that: The root valve is a welded stop valve, the flow meter is a flow meter with a needle valve, the laser gas analyzer is provided with an alarm, and the filter is a T-type filter.

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