Differential pressure cyclone dust removal sampler

Abstract

The differential pressure cyclone dust removal sampler comprises a positive pressure flow guide pipe, a negative pressure flow guide pipe and a sample gas pipe, grooves are formed in the lower ends of the positive pressure flow guide pipe and the negative pressure flow guide pipe, the negative pressure flow guide pipe is arranged in the positive pressure flow guide pipe in a sealed mode, and an air inlet gap is reserved between the negative pressure flow guide pipe and the positive pressure flow guide pipe; a groove of the negative pressure flow guide pipe downwards extends out of the positive pressure flow guide pipe, the direction of the groove of the negative pressure flow guide pipe is opposite to that of the groove of the positive pressure flow guide pipe, a plurality of outer air inlet holes are formed in the negative pressure flow guide pipe, the sample air pipe is arranged in the negative pressure flow guide pipe in a sealed mode, an exhaust gap is reserved between the sample air pipe and the negative pressure flow guide pipe, and a spiral disc is spirally arranged on the sample air pipe. The spiral disc is located in the exhaust gap, a plurality of inner air inlet holes are formed in the sample gas pipe provided with the spiral disc, and the sample gas pipe is connected with a sampling pump. The sampling device has the advantages that centrifugal dust removal can be carried out while sampling is carried out, so that the frequency that the filter is blocked subsequently is reduced, and the replacement and cleaning frequency of the filter is reduced.

Description

Technical Field

[0001] This utility model relates to the field of flue gas emission monitoring technology, and in particular to a differential pressure cyclone dust collector sampler. Background Technology

[0002] The analytical instruments used in current component analysis systems require clean, dry sample gas at room temperature to enter the analyzer's sensors for measurement. Generally, a sampler is used to extract the sample gas from the process pipeline. However, the sample gas in the metallurgical and coal chemical industries contains a relatively large amount of dust. To remove dust, a pre-filter is usually installed at the front end of the sampler. The pre-filter is located in the process pipeline, and it is prone to clogging. This requires the pre-filter to be removed from the process pipeline for cleaning. The high-temperature gas in the process pipeline is a toxic and flammable gas, which poses a certain danger. When workers remove the pre-filter, they are not only prone to inhaling toxic gases and damaging their health, but they also increase the labor intensity of the workers. Utility Model Content

[0003] The purpose of this invention is to provide a differential pressure cyclone dust collector sampler that can remove large dust particles during the sampling process, thereby reducing the frequency of filter clogging.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a differential pressure cyclone dust collector sampler, comprising: a positive pressure guide pipe, a negative pressure guide pipe, and a sample gas pipe. Both the positive and negative pressure guide pipes have bevels at their lower ends. The negative pressure guide pipe is sealed within the positive pressure guide pipe, with an air inlet gap between them. The bevel of the negative pressure guide pipe extends downwards from the positive pressure guide pipe, and the direction of the bevel of the negative pressure guide pipe is opposite to that of the positive pressure guide pipe. Several external air inlets are provided on the negative pressure guide pipe. The sample gas pipe is sealed within the negative pressure guide pipe, with an exhaust gap between them. A spiral disc is coiled on the sample gas pipe, located within the exhaust gap. Several internal air inlets are provided on the sample gas pipe with the spiral disc. The sample gas pipe is connected to a sampling pump.

[0005] Furthermore, in the aforementioned differential pressure cyclone dust collector sampler, a filter is connected to the upper end of the sample gas pipe, and an air supply pipe and a backflush pipe are installed on the filter. The air supply pipe is connected to the filter element in the filter, and the backflush pipe is connected to the outer shell of the filter.

[0006] Furthermore, in the aforementioned differential pressure cyclone dust collector sampler, the filter is sealed and installed in the heating chamber.

[0007] Furthermore, in the aforementioned differential pressure cyclone dust sampler, a first necked flange is fully welded to the outer wall of the upper end of the positive pressure guide pipe, and a sealing ring is sealed in the first necked flange. The sealing ring abuts against the upper end of the positive pressure guide pipe, and the negative pressure guide pipe is sealed and fitted with the sealing ring.

[0008] Furthermore, in the aforementioned differential pressure cyclone dust collector sampler, a second necked flange is fully welded to the outer wall of the upper end of the negative pressure guide pipe. The second necked flange on the negative pressure guide pipe is sealed and fitted with a sealing ring. The second necked flange abuts against the first necked flange. A first sealing gasket is provided between the second necked flange and the first necked flange. An insulation sleeve is sealed on the sample gas pipe. A flat flange is fully welded to the insulation sleeve. The flat flange abuts against the second necked flange. A second sealing gasket is provided between the second necked flange and the flat flange. An installation hole is opened on the heating box. The flat flange is inserted into the installation hole. The first necked flange and the second necked flange are connected to the heating box by bolts.

[0009] Furthermore, in the aforementioned differential pressure cyclone dust collector sampler, four external air inlets are evenly distributed around the circumference of the negative pressure guide tube, and the four external air inlets are located above the spiral disc.

[0010] Furthermore, in the aforementioned differential pressure cyclone dust collector sampler, three rows of internal air inlets are provided on the sample gas pipe equipped with a spiral disc, with four internal air inlets in each row. The four internal air inlets in each row are spirally arranged, and the spiral angle of the four internal air inlets in each row is consistent with the spiral angle of the spiral disc.

[0011] The advantages of this invention are as follows: During sampling, high-temperature gas in the process pipeline can be sampled using pressure difference. After sampling, the high-temperature gas can be centrifuged using pressure difference to remove most of the particulate dust, thus obtaining a relatively clean high-temperature sample gas. Then, under the suction of the sampling pump, the centrifuged high-temperature sample gas is sent into a filter for filtration before being delivered to the corresponding analytical instrument for measurement. Since most of the particulate dust is removed during sampling through centrifugation, the frequency of filter clogging is reduced, and the frequency of filter disassembly and maintenance is decreased. The filter is placed in a heating chamber, and an insulation sleeve is installed on the sampling tube. This system prevents condensation of the sample gas during sampling and filtration, thus preventing dust and condensate from caking on the filter. When the filter needs cleaning, simply backflush the filter element with the backflushing pipe. The impurities backflushed off the filter element will fall into the sample gas tube and then into the process pipeline. When the filter needs maintenance, simply turn off the sampling pump. Without the pump's suction, the high-temperature gas entering the exhaust gap under negative pressure will not enter the sample gas tube. Therefore, when removing the filter, toxic gases in the process pipeline will not affect the workers, thus protecting them. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the differential pressure cyclone dust collector sampler described in this utility model.

[0013] Figure 2 This is a schematic diagram of the differential pressure cyclone dust collector sampler described in this utility model when connected to a heater and process pipeline.

[0014] Figure 3 This is a schematic diagram of the structure of two differential pressure cyclone dust collectors as described in this utility model installed on the process pipeline. Detailed Implementation

[0015] The technical solution of this utility model will be further explained in conjunction with the accompanying drawings and preferred embodiments.

[0016] like Figures 1-3As shown, the differential pressure cyclone dust collector sampler of this utility model includes: a positive pressure guide pipe 1, a negative pressure guide pipe 2, and a sample gas pipe 3. A first necked flange 11 is fully welded to the outer wall of the upper end of the positive pressure guide pipe 1. A sealing ring 12 is sealed in the first necked flange 11 and abuts against the upper end of the positive pressure guide pipe 1. A bevel is provided at the lower end of the positive pressure guide pipe 1, and the angle between the bevel surface of the positive pressure guide pipe 1 and the central axis of the positive pressure guide pipe 1 is 30-40°. A negative pressure guide pipe 2 is provided in the positive pressure guide pipe 1, and the lower end of the negative pressure guide pipe 2 extends... Along with the positive pressure guide pipe 1, a bevel is also provided at the lower end of the negative pressure guide pipe 2. The angle between the bevel slope of the negative pressure guide pipe 2 and the central axis of the negative pressure guide pipe 2 is 30-40°. The bevel direction of the negative pressure guide pipe 2 is opposite to that of the positive pressure guide pipe 1. An air inlet gap 4 is left between the negative pressure guide pipe 2 and the positive pressure guide pipe 1. A second neck flange 21 is fully welded to the outer wall of the upper end of the negative pressure guide pipe 2. The second neck flange 21 is sealed and fitted with the sealing ring 12 in the positive pressure guide pipe 1. The sealing ring 12 serves both a sealing function and a centering function, ensuring that the positive pressure guide pipe 1... The pressure guide pipe 1 and the negative pressure guide pipe 2 are coaxial. The second necked flange 21 abuts against the first necked flange 11. A first sealing gasket 13 is provided between the second necked flange 21 and the first necked flange 11. Four external air inlets 22 are evenly distributed around the circumference of the negative pressure guide pipe 2. The sample gas pipe 3 passes through the negative pressure guide pipe 2. An exhaust gap 5 is left between the sample gas pipe 3 and the negative pressure guide pipe 2. A spiral disk 31 is coiled on the lower half of the sample gas pipe 3. The spiral disk 31 is located in the exhaust gap 5. The four external air inlets 22 on the negative pressure guide pipe 2 are located above the spiral disk 31. The sample gas tube 3, equipped with a spiral disc 31, has three rows of internal air inlets 32, with four internal air inlets 32 in each row. The four internal air inlets 32 in each row are spirally arranged, and the spiral angle of the four internal air inlets 32 in each row is the same as the spiral angle of the spiral disc 31. The three rows of internal air inlets 32 are located near the lower end of the sample gas tube 3. An insulation sleeve 33 is sealed on the upper half of the sample gas tube 3. A flat flange 34 is installed on the insulation sleeve 33. The flat flange 34 is abutted against and connected to the second necked flange 21. A second sealing gasket 23 is installed between the flat flange 34 and the second necked flange 21.

[0017] A filter 6 is connected to the upper end of the sample gas pipe 3. A gas supply pipe 61 and a backflush pipe 62 are installed on the filter 6. The gas supply pipe 61 is connected to the filter element in the filter 6. A sampling pump is installed on the gas supply pipe 61. The sampling pump is existing technology and is not shown in the figure. The backflush pipe 62 is connected to the outer shell of the filter 6. The filter 6 is sealed in the heating box 7. An installation hole 71 is opened on the bottom wall of the heating box 7. The filter 6 is sealed in the installation hole 71. The flat flange 34 is clamped in the installation hole 71 for positioning. The first neck flange 11 and the second neck flange 21 are connected to the heating box 7 by bolts.

[0018] During installation, the first neck flange 11 is bolted and sealed to the connecting flange 81 of the process pipeline 8. The bevel of the positive pressure guide pipe 1 faces the windward direction in the process pipeline 8, and the bevel of the negative pressure guide pipe 2 faces the downwind direction in the process pipeline 8. At the same time, the lower end of the insulation sleeve 33 on the sample gas pipe 3 is close to the process pipeline 8. When the high-temperature gas in the process pipeline 8 flows, it will collide with the front of the bevel facing the windward direction in the positive pressure guide pipe 1. At this time, a positive pressure area will be formed at the bevel facing the windward direction in the positive pressure guide pipe 1. Under the action of positive pressure, the airflow in the process pipeline 8 will move upward along the air inlet gap 4, and then enter the exhaust gap 5 through the four external air inlets 22 on the negative pressure guide pipe 2. Since the bevel of the negative pressure guide pipe 2 faces the downwind direction in the process pipeline 8, the high-temperature gas in the process pipeline 8 is blocked by the back of the bevel of the negative pressure guide pipe 2, causing airflow separation. This reduces the gas pressure on the front of the bevel of the negative pressure guide pipe 2, creating a pressure difference between the bevel of the negative pressure guide pipe 2 and the process pipeline 8. This results in a negative pressure state at the bevel of the negative pressure guide pipe 2. Under the influence of this negative pressure, the high-temperature gas entering the exhaust gap 5 flows downwards. As the high-temperature gas flows downwards, it rotates at high speed under the guidance of the spiral disk 31. The rotation speed increases as the high-temperature gas descends. Larger dust particles in the high-temperature gas, due to their greater weight and centrifugal force, will rotate towards the airflow. The outer ring contains smaller dust particles, while the inner ring remains in the airflow. This creates a distribution of small dust particles in the inner ring and large dust particles in the outer ring within the high-temperature gas. Larger dust particles fall into the gap between the spiral disc 31 and the negative pressure guide pipe 2, and flow downwards with the spiraling airflow until they fall into the process pipe 8. The relatively clean inner ring of high-temperature gas, closer to the sample gas pipe 3, enters the sample gas pipe 3 through the inner air inlet 32 ​​under the suction pressure of the sampling pump, and moves towards the filter 6 as high-temperature sample gas. Since the spiral angle of the four inner air inlets 32 in each row is the same as the spiral angle of the spiral disc 31, the high-temperature gas can be drawn into the sample gas pipe 3 evenly and stably, preventing high temperature... When the sample gas experiences local pressure instability, this ensures that the high-temperature gas descends steadily in a spiral on the spiral disk 31. In this embodiment, the sampling pump's suction pressure is greater than the negative pressure generated by the negative pressure guide pipe 2. This allows the high-temperature gas located at the center of the sample gas pipe 3 to be extracted through the inner air inlet 32. The sampling pump's suction pressure and the negative pressure generated by the negative pressure guide pipe 2 cancel each other out at the bottom of the sample gas pipe 3, thus preventing the negative pressure state in the negative pressure guide pipe 2 from being disrupted. This allows the high-temperature sample gas and large dust particles far from the sample gas pipe 3 to fall into the process pipeline 8 under the action of negative pressure. The sampling pump's suction pressure is greater than the gas pressure in the process pipeline 8. The specific suction pressure of the sampling pump is obtained through multiple adjustments.During the process of the high-temperature sample gas entering the filter 6 from the sample gas pipe 3, the high-temperature sample gas will not condense in the sample gas pipe 3 located between the heating box 7 and the process pipeline 8 due to the insulation effect of the insulation sleeve 33. At the same time, the heating box 7 heats the filter 6, so that the high-temperature sample gas can be filtered in the filter 6 at a high temperature without condensation. Since most of the large dust particles in the high-temperature sample gas have been removed by centrifugation, the filter 6 is not easy to clog. When the filter 6 needs to be cleaned, it is only necessary to open the backflush pipe 62 to backflush the filter element in the filter 6. The impurities backflushed off the filter element will fall into the sample gas pipe 3 and then into the process pipeline 8. If the filter 6 needs to be repaired or replaced, it is only necessary to turn off the sampling pump. After the sample gas pipe 3 is no longer subjected to the suction of the sampling pump, the high-temperature gas entering the exhaust gap 5 will not enter the sample gas pipe 3 under the negative pressure. Therefore, when the filter 6 is removed, the toxic gas in the process pipeline 8 will not affect the workers, thus protecting the workers.

[0019] In order to ensure normal sampling when backflushing filter 6 and replacing filter 6, another differential pressure cyclone dust collector sampler as described in this utility model needs to be added to the process pipeline 8. In this way, when one differential pressure cyclone dust collector sampler as described in this utility model is backflushed or under maintenance, opening the other differential pressure cyclone dust collector sampler as described in this utility model can ensure normal sampling.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A differential pressure cyclone dust collector sampler, characterized in that: include: The system includes a positive pressure guide tube, a negative pressure guide tube, and a sample gas tube. Both the positive and negative pressure guide tubes have bevels at their lower ends. The negative pressure guide tube is sealed within the positive pressure guide tube, with an air inlet gap between them. The bevel of the negative pressure guide tube extends downwards from the positive pressure guide tube, and the direction of the bevel is opposite to that of the positive pressure guide tube. Several external air inlets are provided on the negative pressure guide tube. The sample gas tube is sealed within the negative pressure guide tube, with an exhaust gap between them. A spiral disc is coiled on the sample gas tube, located within the exhaust gap. Several internal air inlets are provided on the sample gas tube with the spiral disc. The sample gas tube is connected to a sampling pump.

2. The differential pressure cyclone dust collector sampler according to claim 1, characterized in that: A filter is connected to the upper end of the sample gas tube. A gas delivery pipe and a backflush pipe are installed on the filter. The gas delivery pipe is connected to the filter element in the filter, and the backflush pipe is connected to the outer shell of the filter.

3. The differential pressure cyclone dust collector sampler according to claim 2, characterized in that: The filter is sealed inside the heating chamber.

4. The differential pressure cyclone dust collector sampler according to claim 3, characterized in that: A first necked flange is fully welded to the outer wall of the upper end of the positive pressure guide pipe. A sealing ring is sealed in the first necked flange. The sealing ring abuts against the upper end of the positive pressure guide pipe, and the negative pressure guide pipe is sealed and fitted with the sealing ring.

5. The differential pressure cyclone dust collector sampler according to claim 4, characterized in that: A second necked flange is fully welded to the outer wall of the upper end of the negative pressure guide pipe. The second necked flange on the negative pressure guide pipe is sealed and fitted with the sealing ring. The second necked flange abuts against the first necked flange. A first sealing gasket is placed between the second necked flange and the first necked flange. An insulation sleeve is sealed on the sample gas pipe. A flat flange is fully welded to the insulation sleeve. The flat flange abuts against the second necked flange. A second sealing gasket is placed between the second necked flange and the flat flange. An installation hole is opened on the heating box. The flat flange is inserted into the installation hole. The first necked flange and the second necked flange are connected to the heating box by bolts.

6. The differential pressure cyclone dust collector sampler according to claim 5, characterized in that: Four external air inlets are evenly distributed around the circumference of the negative pressure guide tube, and the four external air inlets are located above the spiral disk.

7. The differential pressure cyclone dust collector sampler according to claim 6, characterized in that: The sample gas tube equipped with a spiral disc has three rows of internal air inlets, with four internal air inlets in each row. The four internal air inlets in each row are spirally arranged, and the spiral angle of the four internal air inlets in each row is consistent with the spiral angle of the spiral disc.

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