Blast furnace top gas on-line analysis sampling pretreatment device

Abstract

The utility model belongs to the technical field of on-line analysis instrument measurement, and particularly discloses a blast furnace top gas on-line analysis sampling pretreatment device which comprises a sampling pretreatment system and an analyzer cabinet, and the sampling pretreatment system comprises a sampling pretreatment system I and a sampling pretreatment system II, the sampling pretreatment system I and the sampling pretreatment system II are two sets of sampling pretreatment systems with completely same functions and configurations; each sampling pretreatment system comprises a sampling probe, a connecting flange, a manual ball valve I, a temperature measuring thermal resistor, an electric heater, a sampling cabinet, a sampling cabinet sampling gas interface, an external filter, an electric heating sleeve, an electric tracing pipe and an electric three-way ball valve. According to the utility model, double-path switching sampling analysis is adopted, and by virtue of the PLC control unit, a method of automatic gas path switching, automatic blowback dust removal, high-temperature collection and sampling gas conveying is realized, so that the sampling pipeline is effectively prevented from being blocked after water vapor is condensed, and the stability of the system is improved.

Description

Technical Field

[0001] This utility model belongs to the field of online analytical instrument measurement technology, specifically relating to an online analysis sampling and pretreatment device for blast furnace top gas. Background Technology

[0002] Blast furnace gas is a combustible gas produced as a byproduct of blast furnace ironmaking. It can be used for the self-use of metallurgical enterprises, such as heating hot-rolled steel ingots and preheating molten steel ladles. The main components of blast furnace gas are CO, CO2, O2, H2, and CH4, with CO accounting for approximately 25%. With the increasing scale of modern blast furnaces and the growing sophistication of automated control technology, the composition of top gas, a direct product of the furnace reaction, reflects the furnace's internal conditions. Online analysis systems for blast furnace top gas play a crucial guiding role in ensuring safe and high-yield operation of blast furnaces and preventing opaque ironmaking processes, making them an important technological tool.

[0003] Currently, the commonly used online analysis systems for blast furnace top gas in China cannot meet the requirements for long-term online monitoring due to the characteristics of top gas, such as high dust content, high humidity, and large flow rate. The dust in the sampled gas cannot be effectively purified, which can easily clog the gas sampling pipeline and thus interrupt continuous sampling. The high failure rate and large maintenance workload of the sampling pretreatment system have also become major problems that urgently need to be solved.

[0004] To address this technical problem, this utility model proposes an online analysis, sampling, and pretreatment device for blast furnace top gas. Utility Model Content

[0005] To address the problems of existing technologies, the purpose of this utility model is to provide an online analysis and sampling pretreatment device for blast furnace top gas. This device solves the problems that the dusty, humid, and high-flow-rate top gas makes it impossible for the device to meet the requirements of long-term online monitoring, and the dust in the sampled gas cannot be effectively purified, which can easily clog the gas sampling pipeline and thus interrupt continuous sampling.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A blast furnace top gas online analysis and sampling pretreatment device includes a sampling pretreatment system and an analyzer cabinet. A sampling pretreatment system I is connected above the analyzer cabinet. The sampling pretreatment system I has a process pipeline inside, which is connected to the sampling cabinet via a connecting flange. The sampling cabinet is equipped with a temperature measuring resistance thermometer and an electric heater. A sampling probe is also installed on the sampling cabinet. One end of the sampling probe is located inside the process pipeline, and the other end is connected to a manual ball valve I. The other end of the manual ball valve I is connected to an external filter. An electric heating sleeve is installed outside the external filter. The external filter is connected to an electric heat tracing pipe through the sampling gas interface of the sampling cabinet. The electric heat tracing pipe is connected to an electric three-way ball valve. The purging nitrogen interface of the electric three-way ball valve is connected to an electric shut-off valve II, and the inlet of the electric shut-off valve II is connected to a nitrogen pipe.

[0008] More preferably, the sampling pretreatment system includes sampling pretreatment system I and sampling pretreatment system II, which are two sampling pretreatment systems with completely identical functions and configurations, and which share a nitrogen source.

[0009] More preferably, the top of the analyzer cabinet is provided with an analyzer cabinet interface, the sampling gas outlet of the electric three-way ball valve is connected to a gas-liquid separator through the analyzer cabinet interface, the sampling gas outlet of the gas-liquid separator is connected to a manual ball valve II, the sampling gas outlet of the manual ball valve II is connected to a cyclone cooler, the sampling gas outlet of the cyclone cooler is connected to a thermometer, the thermometer is connected to an alarm filter, and the alarm filter is connected to a membrane pump; the liquid discharge port of the gas-liquid separator is connected to a manual ball valve III, the outlet of the manual ball valve III is connected to a water pressure stabilizer, the second inlet of the water pressure stabilizer is connected to the liquid discharge port of the cyclone cooler, the third inlet of the water pressure stabilizer is connected to the liquid discharge port of the alarm filter, and the drain port of the water pressure stabilizer is connected to an overflow tank.

[0010] More preferably, the outlet end of the diaphragm pump is connected to an electric shut-off valve I and an adjustable float flowmeter III. The sampling gas outlet of the electric shut-off valve I is connected to a three-way regulating valve I. One end of the three-way regulating valve I is connected to the adjustable float flowmeter I. The other end of the three-way regulating valve I is connected to a three-way regulating valve II, a manual regulating valve I, and a manual regulating valve II. One end of the three-way regulating valve II is connected to the adjustable float flowmeter II. The other end of the three-way regulating valve II is connected to the manual regulating valve III. The manual regulating valve I is connected to CO and CO2 range calibration gas cylinders. The manual regulating valve II is connected to a zero-point calibration gas cylinder. The manual regulating valve III is connected to an H2 range calibration gas cylinder.

[0011] More preferably, the sampling gas outlet of the adjustable float flowmeter I is connected to an analyzer I; and the sampling gas outlet of the adjustable float flowmeter II is connected to an analyzer II.

[0012] More preferably, the outlets of the water pressure stabilizer, the adjustable float flowmeter III, the analyzer I, and the analyzer II are connected to vent pipes, which extend to the outside of the analyzer cabinet.

[0013] More preferably, the analyzer cabinet is equipped with a PLC controller, and the temperature measuring resistance thermometer, electric heater, electric shut-off valve II and electric three-way ball valve are controlled by the logic of the PLC controller.

[0014] More preferably, the sampling gas outlets of the two sets of electric three-way ball valves are combined and then connected to the gas-liquid separator via the analyzer cabinet interface.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] (1) This utility model adopts dual-path switching sampling analysis. With the help of PLC control unit, it realizes automatic switching of gas path and automatic backflushing and dust removal, realizing maintenance-free and highly reliable anti-clogging continuous sampling; the method of high temperature collection and transportation of sampling gas effectively avoids water vapor condensation and blockage of sampling pipeline, and improves the stability of the system.

[0017] (2) The utility model adopts a fully dry filtration method to ensure that the sampled gas is not distorted during the transportation process; the pollution index of the fine filter element is detected, and the sampling gas is automatically cut off when the pollution index of the filter element exceeds the standard through the PLC control unit, so as to avoid the analysis cell and lens of the analyzer being contaminated; the calibration gas path of the analyzer is integrated to improve the calibration efficiency and avoid the air in the temporary gas source pipeline during calibration from affecting the measurement of the analyzer. Attached Figure Description

[0018] Figure 1 This is a process flow diagram of the present invention;

[0019] In the diagram: 1. Process piping; 2. Sampling probe; 3. Connecting flange; 4. Manual ball valve I; 5. Temperature measuring resistance thermometer; 6. Electric heater; 7. Sampling cabinet; 8. Sampling gas interface of the sampling cabinet; 9. External filter; 10. Electric heating sleeve; 11. Electric heat tracing pipe; 12. Analyzer cabinet interface; 13. Gas-liquid separator; 14. Manual ball valve II; 15. Cyclone cooler; 16. Thermometer; 17. Alarm filter; 18. Electric shut-off valve I; 19. Three-way regulating valve I; 20. Adjustable float flowmeter I; 21. Analyzer I; 22. Three-way regulating valve II; 23. Adjustable... 24. Analyzer II; 25. Adjustable Float Flowmeter III; 26. Vent Pipe; 27. PLC Controller; 28. Manual Ball Valve III; 29. ​​Water Pressure Stabilizer; 30. Overflow Tank; 31. Analyzer Cabinet; 32. Nitrogen Pipe; 33. Electric Shut-off Valve II; 34. Electric Three-way Ball Valve; 35. CO and CO2 Range Calibration Gas Cylinders; 36. Zero-point Calibration Gas Cylinder; 37. H2 Range Calibration Gas Cylinder; 38. Manual Adjusting Valve I; 39. Manual Adjusting Valve II; 40. Manual Adjusting Valve III; 41. Sampling Pretreatment System I; 42. Sampling Pretreatment System II; 43. Diaphragm Pump. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] like Figure 1As shown, an online analysis and sampling pretreatment device for blast furnace top gas includes a sampling pretreatment system and an analyzer cabinet. The sampling pretreatment system comprises sampling pretreatment system I 41 and sampling pretreatment system II 42, which are two identical sampling pretreatment systems with identical functions and configurations. Sampling pretreatment system I and sampling pretreatment system II share a nitrogen source. The purpose of setting up two sampling pretreatment systems is to avoid sampling gas interruption during the backflushing cleaning process. When one sampling pretreatment system enters the backflushing cleaning stage after completing a working cycle, the other sampling pretreatment system immediately intervenes and continues working until the next backflushing cleaning cycle. This process is carried out alternately to ensure that the sampling process is not interrupted. If one sampling pretreatment system fails, the other sampling pretreatment system can be started through the PLC controller 27 to continue sampling without stopping the entire working process or affecting the sampling operation. The sampling pretreatment system I41 includes a process pipeline 1, which is connected to a sampling cabinet 7 via a connecting flange 3. The sampling cabinet 7 is equipped with a temperature-measuring resistance thermometer 5 and an electric heater 6. The temperature-measuring resistance thermometer 5 and the electric heater 6 are controlled by a PLC controller 27 to achieve automatic constant temperature heating. The temperature-measuring resistance thermometer 5 transmits the detected ambient temperature to the PLC controller 27 via a cable. The PLC controller 27 compares the detected ambient temperature value with a set value (75℃) to determine whether the electric heater 6 needs to be activated, thus achieving the constant temperature function. The ambient temperature inside the sampling cabinet 7 needs to be maintained within a constant range (75±5℃) to prevent water vapor in the sampled gas from condensing and liquefying due to temperature fluctuations, which could then mix with dust and block the pipelines inside the sampling cabinet 7. The sampling cabinet 7 is equipped with a sampling probe 2, one end of which is located at 1 / 3 of the way inside the process pipeline 1, collecting the sampled gas from the center of the pipeline to ensure the representativeness of the sampled gas. The other end of the sampling probe 2 is connected to a manual ball valve I4, and the other end of the manual ball valve I4 is connected to an external filter 9. This filter performs coarse filtration of the sampled gas using a ceramic filter element, removing dust particles with a diameter greater than 5µm to ensure the cleanliness of the sampled gas meets requirements. An electric heating sleeve 10 is installed outside the external filter 9. The electric heating sleeve 10 is a constant-temperature compression fitting electric heater. Its function is to heat the external filter 9, maintaining a constant internal temperature of 100±3℃ to prevent water vapor in the sampled gas from condensing and liquefying, which could then mix with dust and clog the external filter 9. The external filter 9 is connected to an electric heating pipe 11 through the sampling gas interface 8 of the sampling cabinet to ensure that water vapor in the sampled gas does not condense and liquefy during winter use, and even if condensation occurs, it will not freeze inside the pipe.The electric heat tracing pipe 11 is connected to an electric three-way ball valve 34. The purging nitrogen port of the electric three-way ball valve 34 is connected to an electric shut-off valve II 33. The inlet of the electric shut-off valve II 33 is connected to a nitrogen pipe 32. The other end of the nitrogen pipe 32 is connected to a nitrogen supply device.

[0022] The top of the analyzer cabinet 31 is equipped with an analyzer cabinet interface 12. The sampling gas outlet of the electric three-way ball valve 34 is connected to a gas-liquid separator 13 through the analyzer cabinet interface 12, where the sampling gas undergoes gas-liquid two-phase separation. The sampling gas outlet of the gas-liquid separator 13 is connected to a manual ball valve II 14, and the sampling gas outlet of the manual ball valve II 14 is connected to a cyclone cooler 15. Compressed air is used to displace the heat in the sampling gas, lowering the sampling gas temperature to 4-6℃. At this temperature, the water vapor in the sampling gas will basically condense and liquefy and be discharged, further reducing the water vapor content in the sampling gas and preventing water vapor from affecting the normal operation of the analyzer. The sampling gas outlet of the cyclone cooler 15 is connected to a thermometer 16, which detects the temperature of the sampling gas and adjusts the flow rate of the cooling compressed air in the cyclone cooler 15 accordingly. By adjusting the flow rate of the cooling compressed air, the sampling gas temperature is maintained between 4-6℃. The thermometer 16 is connected to an alarm-type filter 17, which performs fine filtration of the sampled gas. It uses a G4 grade filter, which can filter out dust and water vapor with a diameter >1um. It also has a filter element contamination index detection alarm function. It can transmit the contamination alarm switch signal of the turbidity detector to the PLC controller 27, so that after the turbidity detector issues a contamination alarm signal, it will interlock and control the electric shut-off valve I 18 to automatically close and issue a fault alarm signal, so as to prevent the dust and water vapor contained in the sampled gas from contaminating the analysis cell and lens of the analyzer I 21 (CO and CO2 analyzer, manufacturer: SERVOMEX, UK, model: 2550) and the analyzer II 24 (H2 analyzer with CO2 dynamic compensation function, manufacturer: SERVOMEX, UK, model: K1550). The alarm filter 17 is connected to a membrane pump 43, which provides the power source for the sampling gas flow of the entire sampling and analysis system, and the PLC controller 27 provides protection interlock for the membrane pump 43. The liquid discharge port of the gas-liquid separator 13 is connected to a manual ball valve III 28, and the outlet of the manual ball valve III 28 is connected to a water pressure stabilizer 29. The second inlet of the water pressure stabilizer 29 is connected to the liquid discharge port of the cyclone cooler 15, and the third inlet of the water pressure stabilizer 29 is connected to the liquid discharge port of the alarm filter 17. The drain port of the water pressure stabilizer 29 is connected to an overflow tank 30. The water pressure stabilizer 29 discharges the condensate in the gas-liquid separator 13, the cyclone cooler 15 and the alarm filter 17, and at the same time seals the sampling gas with the liquid surface to prevent leakage. The overflow tank 30 collects the excess liquid in the water pressure stabilizer 29 to prevent overflow.

[0023] The outlet of the diaphragm pump 43 is connected to an electrically operated shut-off valve I18 and an adjustable float flowmeter III25. The sampling gas outlet of the electrically operated shut-off valve I18 is connected to a three-way regulating valve I19. One end of the three-way regulating valve I19 is connected to an adjustable float flowmeter I20, and the other end is connected to a three-way regulating valve II22, a manual regulating valve I38, and a manual regulating valve II39. One end of the three-way regulating valve II22 is connected to an adjustable float flowmeter II23, and the other end is connected to a manual regulating valve III40. Manual regulating valve I38 is connected to CO and CO2 range calibration cylinders 35, manual regulating valve II39 is connected to a zero-point calibration cylinder 36, and manual regulating valve III40 is connected to an H2 range calibration cylinder 37. The three-way regulating valve I19 can achieve two connection modes: left-side to top and right-side, and right-side to top. The three-way regulating valve II22 can achieve two connection modes: left-side to top and right-side to top. The adjustable float flowmeter I20 and adjustable float flowmeter II23 are used to adjust the real-time flow rate of the sampled gas entering analyzer I21 and analyzer II24. The specific flow range is provided by the analyzer manufacturer.

[0024] The sampling gas outlet of the adjustable float flowmeter I20 is connected to analyzer I21, and the sampling gas outlet of the adjustable float flowmeter II23 is connected to analyzer II24. Analyzer I21 is a CO and CO2 detector, which is used to detect the CO and CO2 gas content in blast furnace gas. Analyzer II24 is an H2 analyzer, which is used to detect the H2 gas content in blast furnace gas.

[0025] The outlets of the water pressure stabilizer 29, the adjustable float flowmeter III 25, the analyzer I 21, and the analyzer II 24 are connected to vent pipes 26, which extend to the outside of the analyzer cabinet 31 to discharge excess waste gas from the water pressure stabilizer 29, ensuring that the interior of the water pressure stabilizer 29 is at atmospheric pressure. The sampled gas discharged here is divided into three categories: the first category is the sampled gas contained in the condensate of the water pressure stabilizer 29; the second category is excess sampled gas; and the third category is the sampled gas discharged after entering the analyzer for detection. The purpose of discharging the second category of sampled gas is twofold: first, to accelerate the flow rate of the sampled gas throughout the sampling system and reduce the sampling gas detection delay; and second, to stabilize the pressure of the entire sampling system by adjusting the discharge rate of the adjustable float flowmeter III 25, ensuring a stable flow rate of sampled gas entering analyzer I 21 and analyzer II 24.

[0026] The analyzer cabinet 31 houses a PLC controller 27, which receives or sends analog signals from the temperature-measuring resistance thermometer 5 and switching signals from the electric heater 6, alarm filter 17, electric shut-off valve I 18, electric shut-off valve II 33, electric three-way ball valve 34, and diaphragm pump 43. It controls these devices according to a compiled and downloaded logic program, enabling automatic constant-temperature heating control, manual and automatic backflushing cleaning, and automatic shut-off alarm for exceeding pollution index limits. More preferably, the sampling gas outlets of the two sets of electric three-way ball valves converge and are connected to a gas-liquid separator via the analyzer cabinet interface.

[0027] When using the automatic backflushing cleaning function or manually starting the backflushing cleaning function, taking the sampling pretreatment system I 41 requiring backflushing cleaning as an example, when the automatic backflushing cleaning time is up or the backflushing cleaning function is manually started on the control panel of PLC controller 27, PLC controller 27 issues a backflushing cleaning command. The backflushing cleaning command is executed in three steps. The first step is that PLC controller 27 issues an opening command to the electric three-way ball valve 34 in sampling pretreatment system II 42. The left side of electric three-way ball valve 34 is connected to the lower side. After the electric three-way ball valve 34 is fully opened, it issues a valve position open feedback signal. After receiving the valve position open feedback signal from electric three-way ball valve 34, PLC controller 27 confirms that sampling pretreatment system II 42 has entered the working state. The second step is that the PLC controller 27 controls the electric three-way ball valve 34 in the sampling pretreatment system I 41 to connect the upper and lower sides of the electric three-way ball valve 34. After the electric three-way ball valve 34 is fully opened, it sends a valve position open feedback signal. The third step is that after receiving the valve position open feedback signal from the electric three-way ball valve 34 in the sampling pretreatment system I 41, the PLC controller 27 issues a command to open the electric shut-off valve II 33. The electric shut-off valve II 33 is fully opened and sends a valve position open feedback signal. After receiving the valve position open feedback signal from the electric shut-off valve II 33, the PLC controller 27 starts to calculate the backflushing cleaning time. The backflushing cleaning time can be modified on the control panel of the PLC controller 27. The backflushing cleaning nitrogen enters the electric heat tracing pipe 11, the external filter 9, the manual ball valve I 4, and the sampling probe 2 through the nitrogen pipe 32, the electric shut-off valve II 33, and the upper and lower sides of the electric three-way ball valve 34, and is finally discharged into the process pipeline 1, realizing the automatic backflushing cleaning function. After the backflushing cleaning time is completed, the PLC controller 27 issues a sampling preparation command. The electric three-way ball valve 34 in the sampling pretreatment system I 41 maintains its position, while the electric shut-off valve II 33 closes. After the electric shut-off valve II 33 is fully closed, it sends a valve position feedback signal. Upon receiving the valve position feedback signal from the electric shut-off valve II 33, the PLC controller 27 confirms that the sampling pretreatment system I 41 has entered standby mode. In automatic backflushing cleaning mode, when one sampling pretreatment system completes a work cycle but before entering the backflushing cleaning stage, the other sampling pretreatment system immediately intervenes and continues working until the next backflushing cleaning cycle arrives. This process is carried out alternately and cyclically to ensure that the sampling process is not interrupted.

[0028] The purpose of setting up two identical sampling pretreatment systems, sampling pretreatment system I41 and sampling pretreatment system II42, is not only to avoid the problem of sampling gas interruption during backflushing and cleaning, but also to solve the problem that when one sampling pretreatment system fails, the other sampling pretreatment system can be manually started through the control panel of PLC controller 27 to perform sampling, thus avoiding the downtime of the analyzer system due to the failure of the sampling pretreatment system.

[0029] The sampling pretreatment system adopts a constant high-temperature sampling and transmission method, and is divided into three parts for heating and heat preservation. The first part is a constant temperature heating system for the internal environment of the sampling cabinet 7, consisting of a temperature measuring resistor 5 and an electric heater 6. The constant temperature value can be set on the control panel of the PLC controller 27, generally set to 75℃, with an upper and lower limit deviation of ±5℃. The electric heater 6 is a constant power type electric heater with a rated power of 800W. The temperature measuring resistor 5 monitors the internal environment temperature of the sampling cabinet 7 in real time. When the temperature measuring resistor 5 detects a temperature value <70℃, the PLC controller 27 issues a command to start the electric heater 6, and the electric heater 6 is energized to heat. When the temperature measuring resistor 5 detects a temperature value >80℃, the PLC controller 27 issues a command to shut down the electric heater 6, and the electric heater 6 loses power and stops heating, thereby achieving a constant temperature function within a certain temperature range. The second part is the electric heating sleeve 10, which is a constant-temperature compression fitting electric heater with a self-heating temperature of 125℃. This keeps the internal ambient temperature of the external filter 9 constant within the range of 100±3℃. The electric heating sleeve 10 requires continuous power for heating. The third part is the electric heat tracing pipe 11. The electric heat tracing pipe 11 uses a constant-temperature electric heating belt laid parallel to the pipeline. The constant-temperature electric heating belt has a self-heating temperature of 110℃, keeping the internal ambient temperature of the pipeline constant within the range of 75±5℃. The electric heat tracing pipe 11 also requires continuous power for heating. By employing these three methods, constant high-temperature sampling and transmission of the sampled gas can be achieved, avoiding blockage problems in the sampling pipeline caused by water vapor condensation, while ensuring high fidelity of the sampled gas.

[0030] Taking the sampling pretreatment system I41 as an example, the sampling gas inside the process pipeline 1 is coarsely filtered through the sampling probe 2, manual ball valve I4, and external filter 9, which can filter out dust particles with a diameter >5μm. The filtered sampling gas is then sent to the gas-liquid separator 13 in the analyzer cabinet 31 through the electric heating pipe 11 and the electric three-way ball valve 34 for gas-liquid two-phase separation. The processed sampling gas then enters the cyclone cooler 15 through the manual ball valve II14 for low-temperature liquefaction of water vapor in the sampling gas. At the same time, the compressed air intake of the cyclone cooler 15 is adjusted in reverse according to the temperature value of the sampling gas detected by the thermometer 16 to ensure that the water content in the sampling gas is ≤5‰ relative humidity. After removing water vapor, the sampled gas is further filtered through the alarm filter 17, which can filter out dust and water vapor with a diameter >3um in the sampled gas. At the same time, the turbidity detector installed on the alarm filter 17 will alarm the filter element's usage status. When the filter element's contamination level exceeds the set standard, the alarm filter 17 will send a contamination alarm switch signal to the PLC controller 27. The PLC controller 27 will control the electric shut-off valve I18 to automatically close and send a fault alarm signal. The filtered sampling gas reaches the membrane pump 43, which provides the power source for the entire sampling and analysis system. The membrane pump 43 operates when the PLC controller 27 receives feedback signals from the lower and right sides of the electric three-way ball valve 34 in sampling pretreatment system I 41 (both valve positions open). If the PLC controller 27 does not receive feedback signals from the lower and right sides of the electric three-way ball valve 34 in sampling pretreatment system I 41 or from the lower and left sides of the electric three-way ball valve 34 in sampling pretreatment system II 42, the membrane pump 43 stops operating to ensure it is not damaged. After passing through the membrane pump 43, the sampling gas is divided into two paths. The first path flows through the adjustable float flowmeter III 25 into the vent pipe 26 and is then discharged into the atmosphere to ensure pressure stability in the subsequent analysis system and reduce sampling gas detection delay. The second stream flows through the electric shut-off valve I18 to the three-way regulating valve I19. The three-way regulating valve I19 then divides the sampled gas into two streams. The first stream of sampled gas enters the adjustable float flowmeter I20 through the upper outlet end of the three-way regulating valve I19. The adjustable float flowmeter I20 adjusts the sampled gas flow rate to the range of 150-200 ml / min before entering the analyzer I21 for gas composition analysis. The analyzed sampled gas then flows through the sampled gas outlet of the analyzer I21 into the vent pipe 26 and is discharged into the atmosphere.The second sampling gas flows through the sampling gas outlet on the right side of the three-way regulating valve I19, the sampling gas inlet on the left side of the three-way regulating valve II22, and the sampling gas outlet on the upper side of the three-way regulating valve II22 before flowing into the adjustable float flowmeter II23. The adjustable float flowmeter II23 adjusts the sampling gas flow rate to the range of 150-200 ml / min before it enters the analyzer II24 for gas composition analysis. The analyzed sampling gas flows through the sampling gas outlet of the analyzer II24 into the vent pipe 26 and is then discharged into the atmosphere. The water pressure stabilizer 29 collects the liquid condensed from the gas-liquid separator 13, the cyclone cooler 15, and the alarm filter 17, and enters the overflow tank 30 through the overflow water outlet to collect the waste liquid.

[0031] The purpose of setting up CO and CO2 range calibration cylinders 35, zero-point calibration cylinder 36, and H2 range calibration cylinder 37 is to facilitate rapid zero-point and range calibration of analyzer I 21 and analyzer II 24. When calibrating the zero point of analyzer I 21 and analyzer II 24, first close adjustable float flowmeters I 20 and II 23, rotate three-way regulating valve I 19 to connect the right and upper sides, rotate three-way regulating valve II 22 to connect the left and upper sides, and then sequentially open the zero-point calibration cylinder 36 valve and the manual adjustment valve. After valve II 39, open adjustable float flowmeter I 20 and adjustable float flowmeter II 23 and adjust to the range of 150-200 ml / min. At this time, the first zero-point calibration gas flows out from the zero-point calibration gas cylinder 36 and enters the analyzer I 21 through manual adjustment valve II 39, three-way adjustment valve I 19 and adjustable float flowmeter I 20 to achieve zero-point calibration; the other zero-point calibration gas enters the analyzer II 24 through manual adjustment valve II 39, three-way adjustment valve II 22 and adjustable float flowmeter II 23 to achieve zero-point calibration.

[0032] When calibrating the range of analyzer I21, first close the adjustable float flowmeter I20 and adjustable float flowmeter II23, rotate the three-way regulating valve I19 to connect the right and upper sides, then open the CO and CO2 range calibration gas cylinder 35 and the manual regulating valve I38 in sequence, and then open the adjustable float flowmeter I20 to adjust it to the range of 150-200 ml / min. At this time, the CO and CO2 range calibration gas flows out from the CO and CO2 range calibration gas cylinder 35, and enters the analyzer I21 through the manual regulating valve I38, the three-way regulating valve I19 and the adjustable float flowmeter I20 to achieve CO and CO2 range calibration.

[0033] The analyzer II24 used is an H2 laser analyzer. The CO2 gas in the sampled gas will affect the detection results of the analyzer II24. Therefore, it is necessary to use the CO2 content detected in the analyzer I21 to correct the H2 content detected in the analyzer II24. Therefore, when calibrating the range of the analyzer II24, it is necessary to ensure that the CO2 content detected by the analyzer I21 is zero. This requires the zero-point calibration gas to be introduced into the analyzer I21.

[0034] When calibrating the analyzer's II24 range, first close the adjustable float flowmeter I20 and adjustable float flowmeter II23. Rotate the three-way regulating valve I19 to connect the right and upper sides, and rotate the three-way regulating valve II22 to connect the right and upper sides. Then, sequentially open the zero-point calibration gas cylinder 36 valve, the manual regulating valve II39, the H2 range calibration gas cylinder 37, and the manual regulating valve III40. Finally, open the adjustable float flowmeter I20 and adjustable float flowmeter II23 and adjust them to 1. Within the range of 50-200 ml / min, the zero-point calibration gas flows out from the zero-point calibration gas cylinder 36 and enters the analyzer I21 through the manual regulating valve II 39, the three-way regulating valve I 19, and the adjustable float flowmeter I 20 to make the detected CO2 content zero; the H2 range calibration gas enters the analyzer II 24 through the range calibration gas cylinder 37, the manual regulating valve III 40, the three-way regulating valve II 22, and the adjustable float flowmeter II 23 to achieve range calibration.

[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An online analysis and sampling pretreatment device for blast furnace top gas, comprising a sampling pretreatment system and an analyzer cabinet, characterized in that: The analyzer cabinet (31) is connected to a sampling pretreatment system I (41). The sampling pretreatment system I (41) is equipped with a process pipeline (1). The process pipeline (1) is connected to a sampling cabinet (7) via a connecting flange (3). The sampling cabinet (7) is equipped with a temperature measuring resistance thermometer (5) and an electric heater (6). The sampling cabinet (7) is equipped with a sampling probe (2). One end of the sampling probe (2) is located inside the process pipeline (1), and the other end of the sampling probe (2) is connected to a manual ball valve I. (4) The other end of the manual ball valve I (4) is connected to an external filter (9). An electric heating sleeve (10) is installed on the outside of the external filter (9). The external filter (9) is connected to an electric heat tracing pipe (11) through the sampling gas interface (8) of the sampling cabinet. The electric heat tracing pipe (11) is connected to an electric three-way ball valve (34). The purging nitrogen interface of the electric three-way ball valve (34) is connected to an electric shut-off valve II (33). The inlet of the electric shut-off valve II (33) is connected to a nitrogen pipe (32).

2. The online analysis, sampling, and pretreatment device for blast furnace top gas according to claim 1, characterized in that: The sampling pretreatment system includes sampling pretreatment system I (41) and sampling pretreatment system II (42). Sampling pretreatment system I (41) and sampling pretreatment system II (42) are two sampling pretreatment systems with the same functions and configurations. Sampling pretreatment system I (41) and sampling pretreatment system II (42) share a nitrogen source.

3. The online analysis, sampling, and pretreatment device for blast furnace top gas according to claim 1, characterized in that: The top of the analyzer cabinet (31) is equipped with an analyzer cabinet interface (12). The sampling gas outlet of the electric three-way ball valve (34) is connected to a gas-liquid separator (13) through the analyzer cabinet interface (12). The sampling gas outlet of the gas-liquid separator (13) is connected to a manual ball valve II (14). The sampling gas outlet of the manual ball valve II (14) is connected to a cyclone cooler (15). The sampling gas outlet of the cyclone cooler (15) is connected to a thermometer (16). The thermometer (16) is connected to an alarm type The filter (17) is connected to a membrane pump (43); the liquid outlet of the gas-liquid separator (13) is connected to a manual ball valve III (28); the outlet of the manual ball valve III (28) is connected to a water pressure stabilizer (29); the second inlet of the water pressure stabilizer (29) is connected to the liquid outlet of the cyclone cooler (15); the third inlet of the water pressure stabilizer (29) is connected to the liquid outlet of the alarm filter (17); and the drain outlet of the water pressure stabilizer (29) is connected to an overflow tank (30).

4. The online analysis, sampling, and pretreatment device for blast furnace top gas according to claim 3, characterized in that: The outlet end of the diaphragm pump (43) is connected to an electric shut-off valve I (18) and an adjustable float flowmeter III (25). The sampling gas outlet of the electric shut-off valve I (18) is connected to a three-way regulating valve I (19). One end of the three-way regulating valve I (19) is connected to an adjustable float flowmeter I (20). The other end of the three-way regulating valve I (19) is connected to a three-way regulating valve II (22), a manual regulating valve I (38), and a manual regulating valve II (39). One end of the three-way regulating valve II (22) is connected to an adjustable float flowmeter II (23). The other end of the three-way regulating valve II (22) is connected to a manual regulating valve III (40). The manual regulating valve I (38) is connected to a CO and CO2 range calibration gas cylinder (35). The manual regulating valve II (39) is connected to a zero-point calibration gas cylinder (36). The manual regulating valve III (40) is connected to an H2 range calibration gas cylinder (37).

5. The online analysis, sampling, and pretreatment device for blast furnace top gas according to claim 4, characterized in that: The sampling gas outlet of the adjustable float flowmeter I (20) is connected to the analyzer I (21); the sampling gas outlet of the adjustable float flowmeter II (23) is connected to the analyzer II (24).

6. The online analysis, sampling, and pretreatment device for blast furnace top gas according to claim 5, characterized in that: The outlets of the water pressure stabilizer (29), the adjustable float flowmeter III (25), the analyzer I (21) and the analyzer II (24) are connected to vent pipes (26), which extend to the outside of the analyzer cabinet (31).

7. The online analysis, sampling, and pretreatment device for blast furnace top gas according to claim 1, characterized in that: The analyzer cabinet (31) is equipped with a PLC controller (27), and the temperature measuring resistance thermometer (5), electric heater (6), electric shut-off valve II (33) and electric three-way ball valve (34) are logically controlled by the PLC controller (27).

8. The online analysis, sampling, and pretreatment device for blast furnace top gas according to claim 3, characterized in that: After the sampling gas outlets of the two sets of electric three-way ball valves (34) converge, they are connected to the gas-liquid separator (13) through the analyzer cabinet interface (12).

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