A blast furnace gas online analysis sample gas processing system

Abstract

This invention provides an online blast furnace gas analysis sample processing system, including an analysis cabinet comprising a sampling module, a pretreatment module, a gas analysis module, and a purging module. The sampling module includes a dust separation hood connected to the inlet of a sampling tube. The sampling tube extends into the blast furnace gas pipeline for sampling. The blast furnace gas pipeline has a welded short pipe connected to a sampling protection box via a mounting flange. The outlet of the sampling tube is connected to the inlet of a through-hole ball valve, and the outlet of the through-hole ball valve is connected to the sample gas inlet at the bottom of the filter chamber. This invention employs an externally mounted microporous ceramic filter for the probe and adds a dust separation hood to the front of the sampling tube, significantly reducing the amount of dust entering the sampling tube and effectively lowering the load on the filtration and dust removal process. This system effectively enables dry sampling under conditions of high temperature, high humidity, multi-component composition, and flammable and explosive blast furnace gas containing large amounts of metallic dust.

Description

Technical Field

[0001] This utility model belongs to the field of instrumentation and measurement technology, and relates to an online analysis sample gas processing system for blast furnace gas. Background Technology

[0002] Blast furnace gas is a byproduct of blast furnace ironmaking, primarily composed of CO, CO2, N2, and H2. It is an important secondary energy source. The chemical composition and thermal characteristics of blast furnace gas are related to factors such as the type of blast furnace fuel, the type of iron being produced, and the characteristics of the blast furnace smelting process. During production, by using a blast furnace gas analyzer to obtain relevant data trends on the gases produced within the blast furnace, operators can intuitively understand and control the gas flow and equipment operation, thereby improving their control over the production process. This is an important technical means that plays a vital role in increasing smelting output, reducing consumption, improving molten iron quality, and ensuring safe production.

[0003] During blast furnace smelting, the furnace gas contains a large amount of impurities such as metal dust and lime. The furnace gas temperature reaches over 200℃, and the gas sampling conditions are often characterized by high temperature, high pressure, high dust, high humidity (water content), multiple components, and flammability and explosiveness. Gas analysis sampling probes are easily clogged by the metal dust contained in the blast furnace gas. In particular, when the gas has a high water content, the condensate and dust particles in the blast furnace gas clump together, making clogging even more likely. If the fault is not handled in a timely manner, it will affect the normal production of the blast furnace.

[0004] Currently, the widely used dry sample gas processing systems for online blast furnace gas analysis fall short of the objective requirements of engineering applications in terms of reliability, stability, and ease of maintenance. External filter-type sampling probes are frequently clogged, heavily reliant on manual cleaning, which has become a bottleneck restricting the stable, coordinated, reliable, and safe operation of online blast furnace gas composition analysis systems. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the prior art by providing an online blast furnace gas analysis sample gas processing system, which solves the problem that the traditional external filter probe is prone to clogging the gas sampling pipeline, thereby interrupting continuous sampling.

[0006] Therefore, the present invention adopts the following technical solution: A blast furnace gas online analysis sample gas processing system includes an analysis cabinet, characterized in that the analysis cabinet comprises a sampling module, a pretreatment module, a gas analysis module, and a purging module; wherein: The sampling module utility model includes a dust separation hood utility model, which is connected to the inlet of a sampling tube utility model. The sampling tube utility model extends into the blast furnace gas pipeline utility model for sampling. The blast furnace gas pipeline utility model is equipped with a welded short pipe utility model, which is connected to the sampling protection box utility model through a mounting flange utility model. The outlet of the sampling tube utility model is connected to the inlet of a through-hole ball valve utility model, and the outlet of the through-hole ball valve utility model is connected to the sample gas inlet at the bottom of the filter chamber utility model. The filter chamber is equipped with a built-in microporous ceramic filter element and is surrounded by an annular electric heater. The microporous ceramic filter element has a hollow fixing rod inside, a baffle at the bottom, and a cyclone disc-type guide plate at the top. The baffle, the microporous ceramic filter element, and the cyclone disc-type guide plate are all connected by the hollow fixing rod and the nut. The top of the filter chamber is connected in sequence to the bracket and the pressure plate. The middle of the pressure plate is provided with a locking handle. The locking handle is connected to the screw. The screw is connected to the clamping cover. The filter cartridge cover is connected to the filter chamber. The sampling module utility model includes a collection end and an output end. The collection end is used to collect sample gas and output it to one side of the sample gas inlet utility model through the output end. The other side of the sample gas inlet utility model is connected to the pretreatment module utility model through a sampling cut-off valve utility model.

[0007] Furthermore, the pretreatment module utility model includes a self-regulating electric heat tracing cable utility model, which is connected to a shut-off valve utility model via a sample gas inlet utility model. The outlet of the shut-off valve utility model is connected to the sample gas inlet of a filter utility model. The sample gas outlet of the filter utility model is connected to the inlet of a solenoid valve utility model. The sample gas outlet of the solenoid valve utility model is connected to the inlets of an electric contact pressure gauge utility model and a needle-type regulating valve utility model, respectively. The sample gas outlet of the needle-type regulating valve utility model is connected to the inlet of a cooling coil utility model. The sample gas outlet of the cooling coil utility model is connected to the inlet of a demisting filter separator utility model.

[0008] Furthermore, the sample gas outlet of the demisting filter separator is connected to the inlet of the first-stage cooling coil of the compressor cooler. The outlet of the first-stage cooling coil of the compressor cooler is connected to the inlet of the suction pump and the needle valve. The outlet of the suction pump is connected to the inlet of the second-stage cooling coil of the compressor cooler, the outlet of the needle valve, and the inlet of the vent flow meter. The outlet of the second-stage cooling coil of the compressor cooler is connected to the inlet of the three-way solenoid valve. The sample gas from the outlet of the three-way solenoid valve enters the sample flow meter through the check valve. The sample gas from the outlet of the sample flow meter is sent to the input interface of the gas analysis module through the humidity alarm membrane filter. The vent ports of the three-way solenoid valve and the vent flow meter are connected to the vent pipe.

[0009] Furthermore, the purge module utility model includes a programmable controller utility model and a nitrogen pipe utility model; the nitrogen pipe is connected to the inlet of the air filter pressure reducing valve, the outlet of the air filter pressure reducing valve is connected to the pressure switch, the gas storage tank, and the inlet of the oil mist filter, the sample gas outlet of the oil mist filter is connected to the inlet of the fourth solenoid valve, the outlet of the fourth solenoid valve utility model is connected to the inlets of the first solenoid valve, the second solenoid valve, and the third solenoid valve, the outlet of the first solenoid valve is connected to the sample gas output interface of the sampling module, and the second solenoid valve is connected to the purge gas interface of the microporous ceramic filter element sampling module.

[0010] Furthermore, the gas analysis module of the present invention employs a laser gas analyzer.

[0011] Furthermore, the sampling module utility model also includes an automatic temperature limiting switch utility model, which is electrically connected to the annular electric heater utility model.

[0012] Furthermore, the hollow fixing rod utility model is provided with a purge air hole on the inner surface of the filter element utility model.

[0013] Furthermore, the condensate of the compressor refrigeration unit is discharged through the first peristaltic pump and the second peristaltic pump respectively.

[0014] The beneficial effects of this utility model are as follows: 1. This utility model uses an external microporous ceramic filter element for the probe and a dust separation cover installed at the front of the sampling tube to greatly reduce the amount of dust entering the sampling tube, effectively reducing the load on filtration and dust removal. 2. This utility model uses a fully heated sampling probe, which not only has a heating element in the external filter but also the sampling tube is in a heated state. This allows the stainless steel filter chamber and the sample temperature to be maintained at a certain set value, which is higher than the dew point temperature of the moisture in the blast furnace gas. This prevents the condensate from mixing with dust particles and clogging the filter, while also preventing acidic soluble gases from dissolving in the condensate and corroding system components, thus ensuring the representativeness of the collected samples. 3. By combining the sampling probe with the platform-mounted backflush box and pulse backflush program, this utility model can achieve low-maintenance or even maintenance-free sampling probe, saving a lot of maintenance costs. 4. In this invention, after the sample gas enters the pretreatment system, the compressor rapidly cools the sample. The water removed by condensation is discharged by a peristaltic pump. Rapid cooling can prevent sample distortion, and precise control of the cooling temperature facilitates the calculation of sample loss, making the analysis results more accurate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the logic diagram for the external backflushing of the filter in this utility model.

[0016] In the diagram: 1-Dust separation hood, 2-Sampling tube, 3-Welded short tube, 4-Mounting flange, 5-Through-hole ball valve, 6-Filter chamber, 7-Annular electric heater, 8-Microporous ceramic filter element, 9-Hollow core fixing rod, 10-Nut, 11-Cyclone disc baffle, 12-Baffle, 13-Air guide hole, 14-Purge air hole on the inner surface of the filter element, 15-Filter cartridge cover, 16-Bracket, 17-Screw, 18-Pressure plate, 19-Locking handle, 20-Clamp 21-Automatic temperature limiting switch; 22-Gathering box; 23-Sampling module sample gas output interface; 24-Sampling module purge gas interface; 25-Probe protective housing; 26-Self-regulating electric heat tracing cable; 27-Sampling shut-off valve; 28-Filter; 29-Solenoid valve; 30-Electrical contact pressure gauge; 31-First needle type regulating valve; 32-Cooling coil; 33-Demisting filter separator; 34-Compressor cooler; 35-Air pump; 36- Second needle-type regulating valve, 37-three-way solenoid valve, 38-one-way valve, 39-sample flow meter, 40-humidity alarm membrane filter, 41-vent flow meter, 42-vent pipe, 43-electric heater, 44-solenoid valve SV2, 45-insulation box unit, 46-third peristaltic pump, 47-first peristaltic pump, 48-second peristaltic pump, 49-vent pipe interface, 50-drain outlet, 51-laser analyzer vent port, 52-sample gas inlet. 53 - Vent pipe interface, 54 - Programmable controller, 55 - Nitrogen pipe, 56 - Air filter pressure reducing valve, 57 - Gas storage tank, 58 - Pressure switch, 59 - Oil mist filter, 60 - First solenoid valve, 61 - Second solenoid valve, 62 - Third solenoid valve, 63 - Fourth solenoid valve, 64 - Sampling module, 65 - Pretreatment module, 66 - Gas analysis module, 67 - Purge module, 68 - Analysis cabinet, 69 - Blast furnace gas pipeline. Detailed Implementation

[0017] The technical solution of this utility model will be described below with reference to the accompanying drawings and implementation methods.

[0018] like Figure 1 As shown, an online blast furnace gas analysis sample gas processing system includes an analysis cabinet 68, which includes a sampling module 64, a pretreatment module 65, a gas analysis module 66, and a purging module 67.

[0019] The sampling module 64 includes a dust separation hood 1, which is connected to the inlet of the sampling tube 2. The sampling tube 2 extends into the blast furnace gas pipeline 69 for sampling. Specifically, the sampling tube 2 is a 25mm straight 316 stainless steel tube. The dust separation hood 1, which is fitted outside the sampling tube opening, has a diameter of 50mm and is straight at both ends. The sample gas pressure is equal, and the zero pressure difference buffer provided ensures that the flow velocity of the sample gas before entering the probe sampling tube opening is only 4cm / s at most, which is much lower than the sample gas flow velocity (10~15m / s). According to Stokes' law, larger particles of dust, droplets and other pollutants in the sample gas will naturally settle under gravity under the condition of rapid velocity reduction and will no longer be suspended. This greatly reduces the proportion of dust, droplets and other pollutants entering the probe sampling tube 2, thereby reducing the load on the filter dust removal and extending the maintenance cycle.

[0020] The blast furnace gas pipeline 69 is equipped with a welded short pipe 3, which is connected to the sampling protection box 25 through the installation flange 4. The outlet of the sampling pipe 2 is connected to the inlet of the through-hole ball valve 5, and the outlet of the through-hole ball valve 5 is connected to the sample gas inlet at the bottom of the filter chamber 6. Specifically, the bottom of the filter chamber 6 is conical, which facilitates the discharge of dust during backflushing. In addition, the filter chamber 6 has a built-in microporous ceramic filter element 8, which is surrounded by an annular electric heater 7. The microporous ceramic filter element 8 has a hollow fixing rod 9 inside, a baffle 12 at the bottom, and a cyclone disc type guide plate 11 at the top.

[0021] Specifically, the hollow fixing rod 9 is provided with a purge air hole 14 on the inner surface of the filter element, which facilitates the uniform distribution of airflow when the microporous ceramic filter element 8 is backflushed; the cyclone disc type guide plate 11 can make the airflow rotate, and during backflushing, centrifugal force is used to separate the dust particles adsorbed on the surface of the microporous ceramic filter element 8 and settle to the bottom of the filter chamber 6 and return to the process pipeline.

[0022] In addition, the baffle 12, the microporous ceramic filter element 8, and the cyclone disc guide plate 11 are all connected by the hollow fixing rod 9 and the nut 10; the top of the filter chamber 6 is connected to the bracket 16 and the pressure plate 18 in sequence, the middle of the pressure plate 18 is provided with a locking handle 19, the locking handle 19 is connected to the screw 17, the screw 17 is connected to the clamping cover 20, and the filter cartridge cover 15 is connected to the filter chamber 6.

[0023] The sampling module 64 also includes a probe protective housing 25, which is provided with a sampling module sample gas output interface 23 and a sampling module purge gas interface 24. The sampling module 64 includes a collection end and an output end. The sampling module sample gas output interface 23 serves as the collection end, used to collect sample gas and output it to one side of the sample gas inlet 52 through the output end. The other side of the sample gas inlet 52 is connected to the pretreatment module 65 through a sampling cut-off valve 27.

[0024] The sampling module 64 also includes an automatic temperature limiting switch 21, which is electrically connected to the annular electric heater 7. The automatic temperature limiting switch 21 controls the operation of the annular electric heater 7, which can keep the temperature of the microporous ceramic filter element 8 and the sample gas at a certain set value (generally 180℃), which is higher than the dew point temperature of the moisture in the gas. This prevents the condensate from mixing with dust particles and clogging the microporous ceramic filter element 8, while also preventing acidic soluble gases from dissolving in the condensate and corroding system components, thus ensuring the representativeness of the collected samples.

[0025] The pretreatment module 65 includes a self-regulating electric heat tracing cable 26, which is connected to a shut-off valve 27 via a sample gas inlet 52. The outlet of the shut-off valve 27 is connected to the sample gas inlet of a filter 28, and the sample gas outlet of the filter 28 is connected to the inlet of a solenoid valve 29. The sample gas outlet of the solenoid valve 29 is connected to an electric contact pressure gauge 30 and the inlet of a first needle-type regulating valve 31, respectively. The sample gas outlet of the first needle-type regulating valve 31 is connected to the inlet of a cooling coil 32, and the sample gas outlet of the cooling coil 32 is connected to the inlet of a demister filter separator 33. The demister filter separator 33 can reduce the workload of the compressor cooler 34, play a role in protecting the system, and ensure that SO2 loss is ≤2.1%, thus solving the technical problem of SO2 loss.

[0026] The sample gas outlet of the demister filter separator 33 is connected to the inlet of the first-stage cooling coil of the compressor cooler 34. The demister filter separator 33 discharges the filtrate through the third peristaltic pump 46. The condensate of the compressor cooler 34 is discharged through the first peristaltic pump 47 and the second peristaltic pump 48 respectively. Specifically, the compressor cooler 34 adopts a compressor-type dual-path sample gas condenser, and the temperature is maintained at about 4℃. Under the premise of reasonable matching, the sample gas dew point is 3.8℃ when in use.

[0027] The outlet of the first-stage cooling coil of the compressor 34 is connected to the air pump 35 and the inlet of the second needle valve 36, respectively. The outlet of the air pump 35 is connected to the inlet of the second-stage cooling coil of the compressor 34, the outlet of the second needle valve 36, and the inlet of the vent flow meter 41, respectively. Appropriate adjustment of the vent flow meter 41 can speed up the response and reduce the measurement lag time.

[0028] The outlet of the second-stage cooling coil of the compressor refrigeration unit 34 is connected to the inlet of the three-way solenoid valve 37. The sample gas from the outlet of the three-way solenoid valve 37 enters the sample flow meter 39 through the one-way valve 38. The sample gas from the outlet of the sample flow meter 39 is sent to the input interface of the gas analysis module 66 through the humidity alarm membrane filter 40.

[0029] The humidity alarm membrane filter 40 has a built-in humidity sensor. When there is supersaturated condensate or liquid water in the sample gas, the interlocking three-way solenoid valve 37 will vent to prevent water from entering the gas analysis module 66 and damaging the instrument. The three-way solenoid valve 37 and the vent flow meter 41 are connected to the vent pipe 42 respectively. After the first stage of condensation and dehumidification of the compressor cooler 34, the vacuum pump 35 has no risk of contact with condensate, which improves the working reliability of the vacuum pump 35.

[0030] The purging module 67 includes a programmable controller 54 and a nitrogen pipe 55. The nitrogen pipe 55 is connected to the inlet of an air filter pressure reducing valve 56. The outlet of the air filter pressure reducing valve 56 is connected to a pressure switch 58, a gas storage tank 57, and the inlet of an oil mist filter 59. The outlet of the oil mist filter 59 is connected to the inlet of a fourth solenoid valve 63. The outlet of the fourth solenoid valve 63 is connected to the inlets of a first solenoid valve 60, a second solenoid valve 61, and a third solenoid valve 62. The outlet of the first solenoid valve 60 is connected to the sample gas output interface 23 of the sampling module. The second solenoid valve 61 is connected to the purge gas interface 24 of the microporous ceramic filter element 8 sampling module.

[0031] The purging module 67 provides 0.6MPa (>0.45MPa) nitrogen gas for purging, which is heated before use to prevent the sampling probe from clogging. In addition, the 6L volume gas storage tank 57 and the solenoid valve group with an internal diameter ≥10mm switch the gas path, which can realize the internal and external back-purging of the microporous ceramic filter element 8. The external purging is designed as a spiral pulse airflow back-purging.

[0032] like Figure 2 As shown, the backflush logic control is completed by the programmable controller 54 with pulse programmable backflush. The backflush cycle is 4 hours, the total purging time is 35 seconds, the backflush time is 1.5 seconds, the stop time is 2 seconds, and the backflush control is continuously turned on and off 6 times. The above purging process can achieve no residual dust in the 6 chambers of the filter cavity, and can enable the sampling probe to operate with little or no maintenance for a long time.

[0033] The gas analysis module 66 uses a laser gas analyzer, specifically an RGAL-Raman laser gas analyzer. The inner wall of the Raman laser gas analyzer-RLGA detection chamber is equipped with 8 optical filters and photoelectric sensors to absorb and detect specific spectral frequencies of different molecules, thereby obtaining the content of 8 different analyte gas components (CO, CO2, H2, O2, CH4, H2O, N2, H2S). It can detect industrial process gases online with a fast response speed, a sampling interval of 50ms, and a response time of less than 1s.

[0034] During the use of this utility model, when the system is running normally, the three-way solenoid valve 37 is energized, and normal analysis can be performed at this time: According to the Stokes effect, at the dust separation hood 1 and the sampling tube 2 inlet with open ends, the flow rate of blast furnace gas containing suspended particles slows down, and the gravity of the suspended particles will cause the dust to fall downwards at an accelerated speed, thereby reducing the amount of suspended dust entering the sampling tube. The sample gas enters the filter chamber 6 through the through-hole ball valve 5 and passes through the microporous ceramic filter element 8 to achieve efficient dust removal of the high-coal sample gas. The microporous ceramic filter element 8 is made of microporous ceramic with a filtration accuracy of 0.3 μm and an airflow resistance of 80 Pa. After filtration, the high-coal sample gas is sent to the pretreatment module 65 through the sample gas output interface 23 of the sampling module via the self-regulating electric heating cable 26 and then connected to the inlet of the filter 28 via the sampling cut-off valve 27. After filtration, the sample gas is sent to the electric contact pressure gauge 30 and the first needle-type regulating valve 31 via the solenoid valve 29. The sample gas outlet of the first needle-type regulating valve 31 is connected to the inlet of the cooling coil 32. The sample gas outlet of the cooling coil 32 is connected to the inlet of the demister filter separator 33. The sample gas outlet of the demister filter separator 33 is connected to the compressor. The compressor cooler 34 is connected to the inlet of the first-stage cooling coil. The outlet of the first-stage cooling coil of the compressor cooler 34 is connected to the inlet of the vacuum pump 35 and the second needle valve 36. The outlet of the vacuum pump 35 is connected to the inlet of the second-stage cooling coil of the compressor cooler 34, the outlet of the second needle valve 36, and the inlet of the vent flow meter 41. The outlet of the second-stage cooling coil of the compressor cooler 34 is connected to the inlet of the three-way solenoid valve 37. The sample gas from the outlet of the three-way solenoid valve 37 enters the sample flow meter 39 through the check valve 38. The sample flow meter 39 is adjusted to maintain its flow rate at 30 L / h. The sample gas from the outlet of the sample flow meter 39 is sent to the input interface of the gas analysis module 66 through the humidity alarm membrane filter 40 for online analysis of the sampled gas.

Claims

1. A blast furnace gas online analysis sample gas processing system, comprising an analysis cabinet (68), characterized in that, The analysis cabinet (68) includes a sampling module (64), a pretreatment module (65), a gas analysis module (66), and a purging module (67); wherein: The sampling module (64) includes a dust separation hood (1), which is connected to the inlet of the sampling tube (2). The sampling tube (2) extends into the blast furnace gas pipeline (69) for sampling. The blast furnace gas pipeline (69) is equipped with a welded short pipe (3), which is connected to the sampling protection box (25) through the mounting flange (4). The outlet of the sampling tube (2) is connected to the inlet of the through-hole ball valve (5), and the outlet of the through-hole ball valve (5) is connected to the sample gas inlet at the bottom of the filter chamber (6). The filter chamber (6) has a built-in microporous ceramic filter element (8) and is surrounded by an annular electric heater (7). The microporous ceramic filter element (8) has a hollow fixing rod (9) inside, a baffle (12) at the bottom, and a cyclone disc type guide plate (11) at the top. The baffle (12), the microporous ceramic filter element (8), and the cyclone disc type guide plate (11) are all connected by the hollow fixing rod (9) and the nut (10). The top of the filter chamber (6) is connected to the bracket (16) and the pressure plate (18) in sequence. The pressure plate (18) is provided with a locking handle (19) in the middle. The locking handle (19) is connected to the screw (17). The screw (17) is connected to the clamping cover (20). The filter cylinder cover (15) is connected to the filter chamber (6). The sampling module (64) includes a collection end and an output end. The collection end is used to collect sample gas and output it to one side of the sample gas inlet (52) through the output end. The other side of the sample gas inlet (52) is connected to the pretreatment module (65) through the sampling cut-off valve (27).

2. The blast furnace gas online analysis sample gas processing system according to claim 1, characterized in that, The pretreatment module (65) includes a self-regulating electric heat tracing cable (26), which is connected to a shut-off valve (27) through a sample gas inlet (52). The outlet of the shut-off valve (27) is connected to the sample gas inlet of the filter (28), and the sample gas outlet of the filter (28) is connected to the inlet of the solenoid valve (29). The sample gas outlet of the solenoid valve (29) is connected to the electric contact pressure gauge (30) and the inlet of the first needle regulating valve (31), respectively. The sample gas outlet of the first needle regulating valve (31) is connected to the inlet of the cooling coil (32), and the sample gas outlet of the cooling coil (32) is connected to the inlet of the demisting filter separator (33).

3. The blast furnace gas online analysis sample gas processing system according to claim 2, characterized in that, The sample gas outlet of the demisting filter separator (33) is connected to the inlet of the first-stage cooling coil of the compressor cooler (34). The outlet of the first-stage cooling coil of the compressor cooler (34) is connected to the inlet of the suction pump (35) and the second needle valve (36). The outlet of the suction pump (35) is connected to the inlet of the second-stage cooling coil of the compressor cooler (34), the outlet of the second needle valve (36), and the inlet of the vent flow meter (41). The outlet of the second-stage cooling coil of the compressor cooler (34) is connected to the inlet of the three-way solenoid valve (37). The sample gas from the outlet of the three-way solenoid valve (37) enters the sample flow meter (39) through the check valve (38). The sample gas from the outlet of the sample flow meter (39) is sent to the input interface of the gas analysis module (66) through the humidity alarm membrane filter (40). The vent ports of the three-way solenoid valve (37) and the vent flow meter (41) are connected to the vent pipe (42).

4. The blast furnace gas online analysis sample gas processing system according to claim 1, characterized in that, The purging module (67) includes a programmable controller (54) and a nitrogen pipe (55); the nitrogen pipe (55) is connected to the inlet of the air filter pressure reducing valve (56), the outlet of the air filter pressure reducing valve (56) is connected to the pressure switch (58), the gas storage tank (57), and the inlet of the oil mist filter (59), respectively, the outlet of the oil mist filter (59) is connected to the inlet of the fourth solenoid valve (63), the outlet of the fourth solenoid valve (63) is connected to the inlet of the first solenoid valve (60), the second solenoid valve (61), and the third solenoid valve (62), respectively, the outlet of the first solenoid valve (60) is connected to the sample gas output interface (23) of the sampling module, and the second solenoid valve (61) is connected to the purge gas interface (24) of the microporous ceramic filter element (8) sampling module.

5. The blast furnace gas online analysis sample gas processing system according to claim 1, characterized in that, The gas analysis module (66) uses a laser gas analyzer.

6. The blast furnace gas online analysis sample gas processing system according to claim 1, characterized in that, The sampling module (64) also includes an automatic temperature limiting switch (21), which is electrically connected to the annular electric heater (7).

7. The blast furnace gas online analysis sample gas processing system according to claim 1, characterized in that, The hollow fixing rod (9) is provided with a purge air hole (14) on the inner surface of the filter element.

8. The blast furnace gas online analysis sample gas processing system according to claim 3, characterized in that, The condensate of the compressor cooler (34) is discharged through the first peristaltic pump (47) and the second peristaltic pump (48).

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