Converter gas recovery and analysis system

Abstract

The utility model discloses a converter gas recovery and analysis system, and relates to the technical field of converter gas recovery. By changing the on-line direct installation mode of the traditional laser analyzer, the device can effectively eliminate the light intensity attenuation of the laser analyzer caused by the pollution of dust and water in converter gas to the laser analysis window lens while ensuring the quick response speed, and can effectively eliminate the large maintenance workload of daily wiping of the window lens, thereby reducing the maintenance cost. The problem that the laser analyzer cannot be calibrated on line is solved, so that the fault rate of the laser analyzer is reduced, the operation stability of the laser analyzer is improved, and rapid, accurate and reliable measurement of the laser gas analyzer is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of converter gas recovery, in particular to a converter gas recovery analysis system. Background Art

[0002] The converter gas recovery and analysis system is an important detection instrument for controlling the recovery or release of converter gas and ensuring the safe operation of the gas holder. The process requires real-time online analysis of the CO and O2 concentrations in the converter gas recovery. The laser online gas analyzer is directly installed on the converter gas recovery pipeline. It has the advantages of fast online real-time detection response speed and is widely used. However, in actual on-site applications, due to the relatively high dust and moisture content in the gas, the laser of the laser online gas analyzer cannot penetrate, and the analyzer measurement data inaccuracy failures occur frequently, affecting gas recovery. Utility Model Content

[0003] In view of the above technical problems, the utility model provides a converter gas recovery and analysis system, which is used to solve the problem that during converter gas recovery and analysis, due to the relatively high dust and moisture content in the gas, the laser of the laser online gas analyzer cannot penetrate, and the analyzer measurement data is often inaccurate, affecting gas recovery.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A converter gas recovery and analysis system comprises a gas induced draft fan and a recovery and analysis device, wherein the air inlet of the gas induced draft fan is connected to an inlet pipe, the inlet pipe is connected to a gas pipe, the air supply port of the gas induced draft fan is connected to an outlet pipe, a dehydration device is installed on the outlet pipe, the dehydration device is connected to the recovery and analysis device via a third sampling tube, the recovery and analysis device is connected to the inlet pipe via an exhaust pipe, and an exhaust valve is installed on the exhaust pipe.

[0006] The recovery and analysis device includes a calibration and measurement gas chamber and a nitrogen valve box. The two ends of the calibration and measurement gas chamber are respectively connected to a laser emitting unit and a laser receiving unit through locking hoops. The laser emitting unit and the laser receiving unit are connected by a cable. Window lenses are provided at both ends of the calibration and measurement gas chamber. The nitrogen valve box is connected to the laser emitting unit through a positive pressure air pipe, and the laser emitting unit is connected to the laser receiving unit through a connecting pipe.

[0007] The dehydration device includes a first sampling tube, two of which are provided, and the two first sampling tubes are installed on the outlet pipe, and the two first sampling tubes are respectively connected to a dehydrator, and the lower ends of the two dehydrators are connected to an automatic drainer through a drain valve, and the upper ends of the two dehydrators are respectively installed with a third sampling tube, and the second sampling valve is installed on the third sampling tube, and the ends of the two third sampling tubes are connected to the second sampling tube, and a flow meter is installed on the second sampling tube, and the end of the second sampling tube is connected to a reversing valve, one end of the reversing valve is connected to a calibration sample gas tank through a calibration tube, and the other end is connected to a calibration measurement gas chamber of a recovery analysis device through the calibration sampling tube.

[0008] The nitrogen valve box is also connected to a purge air pipe, which is divided into two branches. The two branches are respectively connected to the side parts of the window lenses at both ends of the calibration and measurement air chamber to purge nitrogen to the window lenses.

[0009] The first sampling tube is provided with a first sampling valve

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. Effectively utilize the pressure difference between the inlet and outlet of the gas induced draft fan, without adding an exhaust pump, to achieve automatic and rapid sampling of the analyzer, without energy consumption and without the safety hazard of gas leakage.

[0012] 2. Adding two sets of dehydrators (one for use and one for backup) in the sample gas pipeline can effectively separate the dust and moisture in the sample gas, and facilitate daily maintenance and cleaning to ensure the purity of the sample gas entering the calibration measurement chamber.

[0013] 3. The automatic drainer can not only automatically overflow and drain, but also seal the gas to prevent it from overflowing, ensuring that the water and impurities in the dehydrator are discharged in time.

[0014] 4. By adopting this bypass sampling device, the safety risk of climbing over the pipeline for daily maintenance to wipe the window lens can be effectively reduced.

[0015] 5. Free switching between sampling and online calibration is realized without removing the laser analyzer, effectively avoiding measurement errors caused by inconsistent optical path lengths between offline calibration and online measurement.

[0016] 6. Through the flow meter, the flow entering the calibration and measurement air chamber can be controlled to be constant, and the blockage of the dehydrator can be observed through the flow, so as to facilitate timely switching, cleaning and maintenance of the dehydrator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] In the figure:

[0019] 1-laser receiving unit, 2-locking hoop, 3-connecting pipe, 4-calibrated measuring gas chamber, 5-cable, 6-laser emitting unit, 7-flow meter, 8-second sampling tube, 9-reversing valve, 10-calibrated sampling tube, 11-calibrated tube, 12-calibrated sample gas tank, 13-nitrogen valve box, 14-positive pressure gas pipe, 15-second sampling valve, 16-third sampling tube, 18-dehydrator, 20-drain valve, 22-first sampling tube, 24-first sampling valve, 25-automatic drainer, 27-gas induced draft fan, 28-exhaust pipe, 29-exhaust valve, 30-inlet pipe, 31-outlet pipe, 32-purge air pipe, 33-window lens. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0021] Window lenses 33 are installed at both ends of the calibration and measurement gas chamber 4, one end of which is connected to the laser receiving unit 1 through the locking hoop 2, and the other end is connected to the laser emitting unit 6 through the locking hoop 2. The electrical systems of the laser emitting unit 6 and the laser receiving unit 1 are connected through a cable 5, and the cable 5 is used for data transmission between the laser emitting unit 6 and the laser receiving unit 1.

[0022] The nitrogen valve box 13 is connected to the laser emitting unit 6 through the positive pressure air pipe 14, and the air path system of the laser emitting unit 6 and the laser receiving unit 1 is connected through the connecting pipe 3. The function of the nitrogen valve box 13 is to transport positive pressure gas to the laser emitting unit 6 through the positive pressure air pipe 14, and the connecting pipe 3 transports the positive pressure gas in the laser emitting unit 6 to the laser receiving unit 1 to ensure that the positive pressure nitrogen in the nitrogen valve box 13 is passed into the laser emitting unit 6 and the laser receiving unit 1 to meet the explosion-proof requirements on site. At the same time, the nitrogen valve box 13 is connected to the two ends of the calibration measurement air chamber 4 through the purge air pipe 32 in two ways, and nitrogen is purged to the window lens 33 to ensure that the window lens 33 is not contaminated by the medium.

[0023] The dehydrator 18 is filled with glass balls. When the sample gas passes through the glass balls inside the dehydrator 18, the surface of the glass balls can absorb most of the water and dust. After the water forms water droplets, it falls to the bottom of the dehydrator 18 by gravity and finally flows into the automatic drainer 25. Two sets of dehydrators 18 are set up to realize one for use and one for backup, so as to facilitate online switching and maintenance and cleaning of the dehydrator 18 to prevent blockage inside the dehydrator 18. The two sets of dehydrators 18 are operated alternately to maintain the continuity of sampling, prevent dirty sample gas from entering the calibration measurement air chamber 4 to contaminate the window lenses 33 at both ends, and reduce the risk of easy contamination of the window lenses 33.

[0024] The inlet of the flow meter 7 is connected to the third sampling tube 16, and the outlet is connected to the second sampling tube 8. The flow meter 7 can adjust and stabilize the airflow entering the calibration measurement air chamber 4. At the same time, it can also determine whether the dehydrator 18 is blocked according to the change of the flow of the flow meter 7, so as to switch and repair and clean it in time.

[0025] One inlet of the reversing valve 9 is connected to the outlet of the flow meter 7 through the second sampling tube 8, and the other inlet is connected to the calibration sample gas tank 12 through the calibration tube 11. The outlet of the reversing valve 9 is connected to the inlet of the calibration measurement chamber 4 through the calibration sampling tube 10. The outlet of the calibration measurement chamber 4 is connected to one end of the exhaust valve 29 through the exhaust pipe 28, and the other end of the exhaust valve 29 is connected to the inlet pipe 30. The reversing valve 9 can realize free online switching of sampling and calibration.

[0026] During the operation of the fan, the inlet pipe 30 is at negative pressure and the outlet pipe 31 is at positive pressure. Under the action of the gas induced draft fan 27, the sample gas can be freely extracted without adding an exhaust pump, thereby realizing dynamic real-time measurement of the laser gas analyzer, and the sample gas is not discharged, without pollution and safety hazards.

[0027] The working process is as follows:

[0028] The sample gas is completely under the action of the gas induced draft fan 27. The first sampling valve 24 welded on the outlet pipe 31 is positively pressurized, and the sample gas enters the center of the dehydrator 18 through the first sampling tube 22. The diameter of the dehydrator 18 is 100 mm, the height is 250 mm, and the interior is filled with glass balls. When the sample gas passes through the dehydrator 18, the space increases and the flow rate decreases. When the sample gas flows through the gap between the glass balls, the surface of the glass balls can absorb most of the water and dust. The water and dust eventually form sewage and fall to the bottom of the dehydrator 18 under the action of gravity, and finally flow into the automatic drainer 25, which discharges the sewage. The dehydrator 18 is provided with two sets to realize one in use and one in standby operation. The dehydrated sample gas enters the third sampling tube 16 through the second sampling valve 15, and then enters the sampling tube and an inlet of the reversing valve 9 through the flowmeter 7, and finally enters the inlet of the calibration measurement chamber 4 through the outlet of the reversing valve 9 and the calibration sampling tube 10. The sample gas absorbs the laser emitted by the laser emitting unit 6 of the laser analyzer through the calibration measuring gas chamber 4, and the laser receiving unit 1 of the laser analyzer detects the attenuation of the laser intensity to obtain the concentration of the sample gas being measured. The sample gas enters the exhaust pipe 28 and the exhaust valve 29 after passing through the outlet of the calibration measuring gas chamber 4, and finally returns to the negative pressure of the fan inlet pipe 30. The bypass sampling method of the entire sample gas does not require the addition of an air pump, and fully utilizes the inlet and outlet pressure difference of the coal gas induced draft fan 27 to realize automatic sampling of the sample gas, thereby realizing dynamic real-time measurement of the laser gas analyzer.

[0029] The laser gas analyzer should be installed above or on the side of the outlet pipe 31. The calibration and measurement chamber 4 can be modified with the calibration tube 11 provided by the laser gas analyzer manufacturer. The inlet and outlet of the sample gas in the calibration tube 11 are enlarged and welded with a DN15 valve or thread head to facilitate connection with the sampling tube. The sample gas sampling tube uses a DN15 steel pipe. The total length of the sampling tube to the entrance of the laser analyzer calibration and measurement chamber 4 does not exceed 3 meters to meet the requirements of the analyzer's rapid response. Generally, two sets of converter flue gas analyzers are required, one for CO and one for O2 laser gas analysis. The two sets of analyzers can be installed in series. The calibration and measurement chambers of the second laser analyzer can be directly connected in series at the outlet of the calibration and measurement chamber 4 of the first laser analyzer without adding other additional equipment and facilities. Finally, the automatic rapid and continuous analysis of the converter gas recovery CO and O2 laser gas analyzer can be realized, which improves the operating stability of the laser gas analyzer and reduces the failure rate.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A converter gas recovery and analysis system, characterized in that: The invention comprises a coal gas induced draft fan (27) and a recovery and analysis device, wherein the air inlet of the coal gas induced draft fan (27) is connected to an inlet pipe (30), the inlet pipe (30) is connected to the coal gas pipe, the air supply port of the coal gas induced draft fan (27) is connected to an outlet pipe (31), a dehydration device is installed on the outlet pipe (31), the dehydration device is connected to the recovery and analysis device via a third sampling tube (16), the recovery and analysis device is connected to the inlet pipe (30) via an exhaust pipe (28), and an exhaust valve (29) is installed on the exhaust pipe (28).

2. A converter gas recovery and analysis system according to claim 1, characterized in that: The recovery and analysis device comprises a calibration measurement gas chamber (4) and a nitrogen valve box (13); the two ends of the calibration measurement gas chamber (4) are respectively connected to a laser emitting unit (6) and a laser receiving unit (1) via a locking hoop (2); the laser emitting unit (6) and the laser receiving unit (1) are connected via a cable (5); window lenses (33) are provided at both ends of the calibration measurement gas chamber (4); the nitrogen valve box (13) is connected to the laser emitting unit (6) via a positive pressure gas pipe (14); and the laser emitting unit (6) is connected to the laser receiving unit (1) via a connecting pipe (3).

3. A converter gas recovery and analysis system according to claim 2, characterized in that: The dehydration device comprises a first sampling tube (22), wherein two first sampling tubes (22) are provided, the two first sampling tubes (22) are mounted on an outlet pipe (31), the two first sampling tubes (22) are respectively connected to a dehydrator (18), the lower ends of the two dehydrators (18) are connected to an automatic drainer (25) via a drain valve (20), the upper ends of the two dehydrators (18) are respectively mounted with a third sampling tube (16), the third sampling tube (16) is mounted with a second sampling valve (15), the ends of the two third sampling tubes (16) are connected to a second sampling tube (8), a flow meter (7) is mounted on the second sampling tube (8), the end of the second sampling tube (8) is connected to a reversing valve (9), one end of the reversing valve (9) is connected to a calibration sample gas tank (12) via a calibration tube (11), and the other end is connected to a calibration measurement gas chamber (4) of a recovery analysis device via a calibration sampling tube (10).

4. A converter gas recovery and analysis system according to claim 3, characterized in that: The nitrogen valve box (13) is also connected to a purge air pipe (32), and the purge air pipe (32) is divided into two branches, and the two branches are respectively connected to the side of the window lens (33) at both ends of the calibration measurement air chamber (4), so as to purge nitrogen toward the window lens (33).

5. A converter gas recovery and analysis system according to claim 4, characterized in that: A first sampling valve (24) is installed on the first sampling tube (22).

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