Synthesis gas sample gas cooling device

Abstract

This application provides a syngas sample cooling device, comprising, from bottom to top, an intake pipe, a filter pipe, a cooling pipe, a dewatering pipe, and an exhaust pipe; the intake pipe is connected to a gas supply pipeline; the side of the cooling pipe is also connected to a vortex cooling pipe, which is connected to a compressed air pipeline; a control valve is provided between the intake pipe and the filter pipe; the output end of the exhaust pipe is connected to a pretreatment device via a second control valve. This device, by incorporating a vortex cooling pipe connected to the cooling pipe, processes the compressed air supplied by the compressed air pipeline into low-temperature air, which then exchanges heat with the high-temperature syngas inside the cooling pipe, thereby cooling the high-temperature syngas. This overcomes the drawbacks of using water cooling for high-temperature syngas cooling, such as high water consumption, potential safety hazards, and pipe blockage due to water quality.

Description

Technical Field

[0001] This application relates to the field of gas detection technology, and in particular to a syngas sample cooling device. Background Technology

[0002] In the coal chemical industry, controlling the composition of syngas at the gasifier outlet is a crucial step in ensuring the stable operation of subsequent processes. However, the syngas discharged from the gasifier is at a high temperature, generally exceeding 260°C after initial cooling. Therefore, it is not possible to directly collect such high-temperature samples for testing, as this would damage the testing equipment. Thus, the sample gas temperature must be reduced to a level that is harmless to the testing equipment.

[0003] The existing cooling method is to use water cooling to cool the sample gas. However, water cooling requires a continuous flow of circulating water during operation, which is difficult to use in areas with limited water resources. In addition, if a leak occurs due to pipeline damage, toxic and harmful synthesis gas will enter the circulating water system, posing a huge safety hazard. Furthermore, since the circulating water is mostly supplied in an open manner, its water quality is easily affected by the external environment, causing pipeline blockage. Utility Model Content

[0004] This application provides a syngas sample cooling device to solve the problems caused by using water cooling to cool the syngas sample.

[0005] This application provides a synthesis gas sample cooling device, which includes an intake pipe, a filter pipe, a cooling pipe, a water removal pipe and an exhaust pipe connected in sequence from bottom to top;

[0006] The intake pipe is connected to the gas supply pipeline;

[0007] The side of the cooling pipe is also connected to the vortex cooling pipe, which in turn is connected to the compressed air pipeline.

[0008] A first control valve is installed between the air intake tube and the filter tube;

[0009] The exhaust pipe's output end is connected to the pretreatment device via a second control valve.

[0010] Optionally, the side of the exhaust pipe is connected to a nitrogen purging line via a third control valve.

[0011] Optionally, filter screen layers are provided at both ends of the filter tube.

[0012] A desulfurization layer and a dehydration layer are filled between the filter layers at both ends;

[0013] The desulfurization layer is filled with iron oxide desulfurizing agent.

[0014] Optionally, the cooling pipe includes a casing;

[0015] The two ends of the shell are sealed by tube sheets. Multiple heat exchange tubes are installed inside the shell, passing through the tube sheets at both ends of the shell and connecting the two ends of the shell.

[0016] One side of the upper part of the shell is connected to the vortex cooling tube, and the lower side is provided with an air outlet.

[0017] Optionally, a coalescing separation layer is provided inside the water pipe.

[0018] Optionally, the pretreatment device includes a water-cooled heat exchanger, a separator, a pressure reducing valve, and a detector connected in series.

[0019] The bottom of the separator is connected to the drain pipe and the wastewater treatment section in sequence via the fourth control valve.

[0020] Optionally, an electric heating tape is wrapped around the outside of the drain pipe.

[0021] This application provides a syngas sample cooling device. By incorporating a vortex cooling pipe connected to a cooling tube, compressed air supplied from a compressed air pipeline is processed into low-temperature air and supplied to the cooling tube. This air exchanges heat with the high-temperature syngas inside the cooling tube, thus cooling the high-temperature syngas. This cooling process uses low-temperature compressed air processed by the vortex cooling pipe to cool the cooling tube, overcoming the drawbacks of water cooling methods, such as high water consumption, potential safety hazards, and pipe blockage due to water quality issues. Furthermore, this application also includes a filter pipe for filtering the syngas and a dewatering pipe to remove droplets generated during the syngas cooling process, resulting in a cleaner sample gas and reducing its impact on test results. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a syngas sample cooling device is provided for one embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a filter tube provided in one embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a cooling pipe provided in one embodiment of this application;

[0026] Figure 4This is a schematic diagram of the structure of a water removal pipe provided in one embodiment of this application;

[0027] Figure 5 A schematic diagram of a preprocessing apparatus provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the structure of a drainage pipe provided in one embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Air intake pipe; 2. Filter pipe; 3. Cooling pipe; 4. Water removal pipe; 5. Exhaust pipe; 6. Gas transmission pipeline; 7. Vortex cooling pipe; 8. Pretreatment device; 9. Controller; 10. Compressed air pipeline; 20. Nitrogen purging pipeline; 21. Filter screen layer; 22. Desulfurization layer; 31. Tube shell; 32. Tube sheet; 33. Heat exchanger tube; 41. Coalescing separation layer; 81. Water-cooled heat exchanger; 82. Separator; 83. Pressure reducing valve; 84. Detector; 85. Drainage pipeline; 86. Wastewater treatment section; 100. First control valve; 200. Second control valve; 300. Third control valve; 301. Air outlet; 400. Fourth control valve; 851. Electric heating tape. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0032] like Figure 1 As shown, this application provides a syngas sample cooling device, which includes an intake pipe 1, a filter pipe 2, a cooling pipe 3, a water removal pipe 4 and an exhaust pipe 5 connected sequentially from bottom to top;

[0033] The intake pipe 1 is connected to the gas supply pipe 6;

[0034] The side of the cooling pipe 3 is also connected to the vortex cooling pipe 7, and the vortex cooling pipe 7 is connected to the compressed air pipeline 10.

[0035] A first control valve 100 is provided between the air intake tube 1 and the filter tube 2;

[0036] The output end of the exhaust pipe 5 is connected to the pretreatment device 8 via the second control valve 200.

[0037] In this application, the air intake pipe 1, filter pipe 2, cooling pipe 3, water removal pipe 4 and exhaust pipe 5 are connected by flanges, which facilitates the maintenance, repair and replacement of each section of the pipeline.

[0038] During normal use, the first control valve 100 and the second control valve 200 are opened. At this time, a portion of the high-temperature syngas in the gas delivery pipeline 6 will pass through the gas inlet pipe 1 and the first control valve 100 before entering the filter pipe 2. In the filter pipe 2, particulate matter is initially filtered and desulfurized. The filtered and desulfurized syngas then enters the cooling pipe 3 through the filter pipe 2.

[0039] After desulfurization, the flue gas enters the cooling pipe 3. Simultaneously, compressed air is introduced into the vortex cooling pipe 7 through the compressed air pipeline 10. The compressed air undergoes high-speed rotation and separation in the vortex cooling pipe 7 to obtain low-temperature air with a lower temperature and high-temperature air with a higher temperature. The low-temperature air enters from one side of the pipe shell 31 of the cooling pipe 3 to exchange heat and cool the high-temperature syngas. The low-temperature air after heat exchange is discharged from the cooling pipe 3, while the high-temperature air is discharged from the other end of the vortex cooling pipe 7. After the syngas is cooled in the cooling pipe 3 (temperature of about 70°C), some of the water vapor in it will condense into fine droplets. The cooled syngas is then input into the dehydration pipe 4. Under the selective permeability interception effect of the coalescing separation layer filled in the dehydration pipe 4, the fine droplets in the syngas are intercepted, and the syngas passes through, achieving the initial dehydration of the syngas. The dehydrated syngas is discharged from the top of the exhaust pipe 5 into the pretreatment device 8.

[0040] This application provides a syngas sample cooling device. By installing a vortex cooling pipe 7 connected to a cooling pipe 3, compressed air supplied from the compressed air pipeline 10 is processed into low-temperature air and supplied to the cooling pipe 3. This air exchanges heat with the high-temperature syngas inside the cooling pipe 3, achieving cooling of the high-temperature syngas. The cooling process uses low-temperature compressed air processed by the vortex cooling pipe 7 to cool the cooling pipe 3, overcoming the disadvantages of water cooling methods, such as high water consumption, potential safety hazards, and pipe blockage due to water quality issues. Furthermore, this application also includes a filter pipe 2 for filtering the syngas and a water removal pipe 4 to remove droplets generated during the syngas cooling process, resulting in a cleaner sample gas and reducing its impact on test results.

[0041] like Figure 1 As shown, optionally, the side of the exhaust pipe 5 is connected to the nitrogen purging line 20 via a third control valve 300.

[0042] During use, filter tube 2 may become clogged. In this case, open the third control valve 300 (the third control valve 300 is closed during normal operation) and supply nitrogen (room temperature nitrogen or high temperature nitrogen depending on the degree of clog) through the nitrogen purging line 20 to backflush filter tube 2, thereby cleaning the filter tube. Alternatively, the third control valve 300, the second control valve 200, and the first control valve 100 can be electrically connected to the controller, allowing remote control of the backflushing process.

[0043] like Figure 2 As shown, optionally, filter screen layers 21 are respectively provided at both ends of the filter tube 2, and a desulfurization layer 22 is filled between the filter screen layers 21 at both ends.

[0044] The desulfurization layer 22 is filled with iron oxide desulfurizing agent.

[0045] In this application, the filter layer 21 not only serves to filter the syngas, but also supports the desulfurization layer 22 inside the filter tube 2 and prevents leakage.

[0046] In use, a portion of the high-temperature syngas (approximately 263°C) in the gas supply pipeline 6 passes through the gas inlet pipe 1 and the first control valve 100 before entering the filter pipe 2. The filter screen in the filter layer 21 of the filter pipe 2 preliminarily filters out particulate matter. The filtered syngas then enters the desulfurization layer 22. Under the action of the iron oxide packing material filled in the desulfurization layer 22, the syngas reacts with the iron oxide to generate ferric sulfate, thereby removing sulfur dioxide from the syngas and achieving the purpose of desulfurization of the syngas.

[0047] like Figure 3 As shown, optionally, the cooling pipe 3 includes a pipe shell 31;

[0048] In use, the two ends of the shell 31 are sealed by the tube sheet 32. Multiple heat exchange tubes 33 are installed inside the shell 31. The heat exchange tubes 33 pass through the tube sheet 32 ​​at both ends of the shell 31 and connect the two ends of the shell 31.

[0049] One side of the upper part of the shell 31 is connected to the vortex cooling pipe 7, and the lower side is provided with an air outlet 301.

[0050] In this application, the flue gas after desulfurization enters multiple heat exchange tubes 33 of the cooling pipe 3. At the same time, compressed air is introduced into the vortex cooling pipe 7 through the compressed air pipeline 10. The compressed air is separated into low-temperature air and high-temperature air by high-speed rotation in the vortex cooling pipe 7. The low-temperature air enters from one side of the cooling pipe 3 shell and cools the high-temperature synthesis gas in the heat exchange tubes 33 in the shell 31. The low-temperature air after heat exchange is discharged from the air outlet 301 at the lower part of one side of the shell 31, while the high-temperature air is discharged from the other end of the vortex cooling pipe 7.

[0051] like Figure 4 As shown, optionally, a coalescing separation layer 41 is provided inside the water pipe 4.

[0052] In this application, the coalescence separation layer 41 includes a coalescence packing filter element and a separation packing filter element along the gas travel direction. The porous media material inside the coalescence filter element enables the collisional coalescence of dispersed phase droplets, coalescing μm-sized tiny droplets into millimeter-sized large particles. The separation filter element uses oleophilic-hydrophobic or hydrophilic-oleophilic materials, utilizing surface wetting properties to selectively intercept target droplets, thereby achieving coalescence and interception of fine droplets formed in the syngas after cooling by the cooling pipe 3. It should be noted that after cooling by the cooling pipe 3, the temperature of the syngas is still around 70°C, and a considerable portion of water still exists in the syngas in gaseous form. This portion of water is difficult to separate and remove by the coalescence separation layer 41 and requires further cooling removal by subsequent equipment.

[0053] The material of the coalescing separation layer 41 mentioned above can be referenced to the corresponding filter material used in gas-liquid coalescers or coalescers.

[0054] like Figure 5 As shown, optionally, the pretreatment device 8 includes a water-cooled heat exchanger 81, a separator 82, a pressure reducing valve 83 and a detector 84 connected in series.

[0055] The bottom of separator 82 is connected in sequence to drain pipe 85 and wastewater treatment section 86 via fourth control valve 400.

[0056] During operation, the pre-treated, desulfurized, and dehydrated syngas is further cooled to room temperature in a water-cooled heat exchanger 81. At this temperature, the moisture in the syngas will further condense (because the temperature is now below the dew point of water), forming droplets that mix with the syngas. The syngas mixed with droplets enters the separator 82 for gas-liquid separation. The separated syngas enters the detector 84 through the pressure reducing valve 83 for detection. The separated droplets collect at the bottom of the separator 82, i.e., the waste liquid. When this waste liquid accumulates to a certain level, it is discharged into the drain pipe 85 through the fourth control valve 400, and then discharged into the wastewater treatment section 86 for centralized treatment.

[0057] like Figure 6 As shown, optionally, an electric heating tape 851 is wrapped around the outside of the drain pipe 85.

[0058] In this application, during the cold season, the low temperature may cause the waste liquid entering the drain pipe 85 to freeze. At this time, the drain pipe 85 can be heated by energizing the electric heating tape 851, thereby maintaining the wastewater in the pipe at a non-freezing temperature to prevent the pipe from freezing and blocking.

[0059] A syngas sample cooling device, the working process of which is as follows:

[0060] During normal operation, the first control valve 100 and the second control valve 200 are opened, and the third control valve 300 is closed. At this time, a portion of the high-temperature syngas in the syngas delivery pipeline 6 passes through the inlet pipe 1 and the first control valve 100 before entering the filter pipe 2. The filter screen in the filter layer 21 of the filter pipe 2 preliminarily filters out particulate matter. The filtered syngas then enters the desulfurization layer 22. Under the action of the iron oxide packing material filled in the desulfurization layer 22, the syngas reacts with the iron oxide to generate ferric sulfate, thereby removing sulfur dioxide from the syngas and achieving the purpose of desulfurization. The desulfurized syngas then passes through the filter screen layer 21 at the top of the filter pipe 2 (mainly intercepting the iron oxide packing material in the desulfurization layer 22) before entering the cooling pipe 3.

[0061] After desulfurization, the flue gas enters multiple heat exchange tubes 33 of the cooling tube 3. Simultaneously, compressed air is introduced into the vortex cooling tube 7 through the compressed air pipeline 10. The compressed air undergoes high-speed rotation and separation in the vortex cooling tube 7 to obtain low-temperature air and high-temperature air. The low-temperature air enters from one side of the tube shell of the cooling tube 3 and cools the high-temperature synthesis gas in the heat exchange tube 33 of the tube shell 31. The low-temperature air after heat exchange is discharged from the air outlet 301 at the lower part of one side of the tube shell 31, while the high-temperature air is discharged from the other end of the vortex cooling tube 7. After the synthesis gas is cooled (to about 70°C) in the heat exchange tube 33, some of the water vapor in it will condense into fine droplets. The cooled synthesis gas is then fed into the dehydration tube 4. Under the selective permeability interception effect of the coalescing separation layer filled in the dehydration tube 4, the fine droplets in the synthesis gas are intercepted. The synthesis gas is then partially dehydrated. The dehydrated synthesis gas is discharged from the top of the exhaust pipe 5 into the pretreatment device 8.

[0062] After pretreatment, cooling, desulfurization, and water removal, the syngas is further cooled to room temperature (approximately 25°C) in a water-cooled heat exchanger 81. At this temperature, the moisture in the syngas will further condense (because the temperature is now below the dew point of the moisture) to form droplets mixed in the syngas. The syngas mixed with droplets enters the separator 82 for gas-liquid separation. The separated syngas enters the detector 84 through the pressure reducing valve 83 for detection. The separated droplets collect at the bottom of the separator 82, i.e., the waste liquid. When this waste liquid accumulates to a certain level, it is discharged into the drain pipe 85 through the fourth control valve 400, and then discharged into the wastewater treatment section 86 for centralized treatment.

[0063] In the cold season, the low temperature may cause the waste liquid entering the drain pipe 85 to freeze. At this time, the drain pipe 85 can be heated by energizing the electric heating tape 851, thereby maintaining the wastewater in the pipe at a non-freezing temperature to prevent the pipe from freezing and blocking.

[0064] During use, filter tube 2 may become clogged. At this time, open the third control valve 300 and close the fourth control valve 400. Supply nitrogen (room temperature nitrogen or high temperature nitrogen depending on the blockage) through nitrogen purging line 20 to backflush filter tube 2 and clean the filter tube.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A syngas sample cooling device, characterized in that, It includes an air intake pipe (1), a filter pipe (2), a cooling pipe (3), a water removal pipe (4), and an exhaust pipe (5) connected sequentially from bottom to top. The gas inlet pipe (1) is connected to the gas delivery pipe (6); The side of the cooling pipe (3) is also connected to the vortex cooling pipe (7), which is connected to the compressed air pipeline (10). A first control valve (100) is provided between the air intake tube (1) and the filter tube (2). The output end of the exhaust pipe (5) is connected to the pretreatment device (8) via a second control valve (200).

2. The syngas sample cooling device according to claim 1, characterized in that, The side of the exhaust pipe (5) is connected to the nitrogen purging line (20) via a third control valve (300).

3. The syngas sample cooling device according to claim 1, characterized in that, The filter tube (2) has filter screen layers (21) at both ends. A desulfurization layer (22) is filled between the filter layers (21) at both ends; The desulfurization layer (22) is filled with iron oxide desulfurizing agent.

4. The syngas sample cooling device according to claim 1, characterized in that, The cooling pipe (3) includes a casing (31); The two ends of the shell (31) are sealed by tube sheets (32). Multiple heat exchange tubes (33) are provided inside the shell (31). The heat exchange tubes (33) pass through the tube sheets (32) at both ends of the shell (31) and connect the two ends of the shell (31). The upper side of the shell (31) is connected to the vortex cooling pipe (7), and the lower side is provided with an air outlet (301).

5. The syngas sample cooling device according to claim 1, characterized in that, The water removal pipe (4) is provided with a coalescing separation layer (41).

6. The syngas sample cooling device according to claim 1, characterized in that, The pretreatment device (8) includes a water-cooled heat exchanger (81), a separator (82), a pressure reducing valve (83), and a detector (84) connected in series. The bottom of the separator (82) is connected in sequence to the drain pipe (85) and the wastewater treatment section (86) via the fourth control valve (400).

7. The syngas sample cooling device according to claim 6, characterized in that, The drain pipe (85) is wrapped with an electric heat tracing tape (851).

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