Liquid filtration device for heat exchange of sulphuric acid in complex flue gas

Abstract

The utility model relates to the technical field of heat exchange for acid production from sulfur-containing flue gas, and in particular to a liquid filtering device for heat exchange for acid production from complex sulfur-containing flue gas. Its technical scheme includes: a solution dispersion mechanism for stirring and breaking up a solution and selectively separating the solution, the solution dispersion mechanism includes a solution dispersion cylinder, a solution dispersion shaft that rotates horizontally in the solution dispersion cylinder, and a dispersion leaf assembly that can adjust the position up and down along the solution dispersion shaft; a filtering mechanism for filtering different liquid layer solutions at different levels, the filtering mechanism includes a filter cylinder, a partition plate that is arranged inside the filter cylinder to divide the internal space into multiple parts, and a coarse filter screen and a fine filter screen that are respectively located on the upper and lower sides of the partition plate. The utility model can pre-disperse the solution drawn out of the heat exchanger through the solution dispersion mechanism, and can filter the dispersed solution through the filtering mechanism. The treated solution is then returned to the heat exchanger for secondary heat exchange to reduce or avoid blockage, thereby increasing the service life of the heat exchanger.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange for acid production from sulfur-containing flue gas, and in particular to a liquid filtering device for heat exchange of acid production from complex sulfur-containing flue gas. Background Art

[0002] When sulfur-containing flue gas is used to make acid, heat exchange needs to be performed using heat exchange devices such as plate heat exchangers. For acid production with complex sulfur-containing flue gas, the impurities are relatively high, and the heat exchanger is easily blocked when the solution refluxes after heat exchange, resulting in a reduction in the service life of the exchanger. To this end, the utility model proposes a liquid filtration device for heat exchange of acid production with complex sulfur-containing flue gas. Utility Model Content

[0003] The purpose of the utility model is to address the problems existing in the background technology and to propose a liquid filtering device for heat exchange of acid production from complex sulfur-containing flue gas.

[0004] The technical solution of the utility model: a liquid filtering device for heat exchange of acid production from complex sulfur-containing flue gas, comprising: a solution dispersion mechanism for stirring and breaking up a solution and selectively separating the solution, the solution dispersion mechanism comprising a solution dispersion cylinder, a solution dispersion shaft rotating horizontally in the solution dispersion cylinder, and a dispersion leaf assembly whose position can be adjusted up and down along the solution dispersion shaft; a filtering mechanism for performing different levels of filtering treatment on solutions of different liquid layers, the filtering mechanism comprising a filter cylinder, a partition plate arranged inside the filter cylinder for dividing the internal space into a plurality of partitions, and a coarse filter screen and a fine filter screen respectively located on the upper and lower sides of the partition plate.

[0005] Optionally, the dispersion blade assembly includes a blade tube that is slidably engaged with the solution dispersion shaft and a plurality of blades installed on the outer wall of the blade tube.

[0006] Optionally, a guide slider is fixedly connected to the inner wall of the impeller, and a guide groove for vertical sliding of the guide slider is provided on the outer wall of the solution dispersion shaft.

[0007] Optionally, a threaded ring is rotatably connected to the top of the impeller, and the threaded ring is threadably engaged with the top of the solution dispersion shaft.

[0008] Optionally, the solution dispersing mechanism includes a motor fixedly connected to the top of the solution dispersing cylinder, and the bottom end of the motor output shaft is coaxially fixedly connected to the top end of the solution dispersing shaft.

[0009] Optionally, the solution dispersion mechanism includes a turbid liquid tube, one end of which is connected to the solution dispersion cylinder and extends to the lower turbid liquid of the solution dispersion cylinder, and the other end of which is connected to the filter cylinder and extends above the coarse filter.

[0010] Optionally, the solution dispersion mechanism includes a clear liquid pipe, one end of which is connected to the solution dispersion cylinder and extends to the upper clear liquid of the solution dispersion cylinder, and the other end of which is connected to the filter cylinder and extends above the fine filter.

[0011] Optionally, the filtering mechanism includes a coarse slag discharge pipe and a fine slag discharge pipe, the coarse slag discharge pipe is connected to the filter cylinder and is located on the upper side of the coarse filter screen, and the fine slag discharge pipe is connected to the filter cylinder and is located on the upper side of the fine filter screen.

[0012] Optionally, the filtering mechanism includes a circulation pipe with both ends connected to the filter cartridge, one end of the circulation pipe is located at the lower side of the coarse filter screen, and the other end of the circulation pipe is located at the upper side of the fine filter screen.

[0013] Optionally, the filtering mechanism includes a filtrate discharge pipe, which is connected to the filter cartridge and is located at the lower side of the fine filter screen.

[0014] Compared with the prior art, the utility model has the following beneficial technical effects:

[0015] The present application can pre-disperse the solution drawn out of the heat exchanger through the solution dispersion mechanism, and can filter the dispersed solution through the filtering mechanism. The treated solution is then returned to the heat exchanger for secondary heat exchange to reduce or avoid blockage, thereby increasing the service life of the heat exchanger.

[0016] Furthermore, as the vertical position of the dispersion leaf assembly is adjusted, the solution in the solution dispersion cylinder can be divided into two layers, turbid and clear, and the two layers of solution can be filtered and processed respectively using a coarse filter and a fine filter, thereby achieving a better filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a liquid filtration device used for heat exchange of acid production from complex sulfur-containing flue gas;

[0018] Figure 2 for Figure 1 A cross-sectional view of

[0019] Figure 3 for Figure 2 A magnified schematic diagram of center A.

[0020] Reference numerals: 1. support frame;

[0021] 2. Solution dispersing mechanism; 21. Solution dispersing cylinder; 22. Solution dispersing shaft; 221. Guide slide; 23. Dispersing blade assembly; 231. Blade cylinder; 2311. Guide slide block; 232. Blade; 24. Threaded ring; 25. Motor; 26. Turbid liquid pipe; 27. Clear liquid pipe;

[0022] 3. Filter mechanism; 31. Filter cartridge; 32. Partition plate; 33. Coarse filter screen; 34. Fine filter screen; 35. Coarse residue discharge pipe; 36. Fine residue discharge pipe; 37. Circulation pipe; 38. Filtrate discharge pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1-Figure 3 As shown, the utility model proposes a liquid filtering device for heat exchange of acid production from complex sulfur-containing flue gas.

[0027] It includes a solution dispersing mechanism 2 for stirring and breaking up the solution and selectively separating the solution, and a filtering mechanism 3 for filtering different liquid layers at different levels;

[0028] The solution dispersion mechanism 2 includes a solution dispersion cylinder 21, and the solution dispersion cylinder 21 is fixedly supported by a support frame 1. A motor 25 is fixedly connected to the top of the solution dispersion cylinder 21, and the bottom end of the output shaft of the motor 25 is coaxially fixedly connected to the top of the solution dispersion shaft 22, and the bottom end of the solution dispersion shaft 22 is rotationally connected to the bottom of the solution dispersion cylinder 21 through a bearing. The dispersion leaf assembly 23 includes a blade cylinder 231 that is slidably engaged with the solution dispersion shaft 22 and a plurality of blades 232 installed on the outer wall of the blade cylinder 231, a guide slider 2311 is fixedly connected to the inner wall of the blade cylinder 231, and a guide groove 221 for the guide slider 2311 to slide vertically is provided on the outer wall of the solution dispersion shaft 22. When the solution dispersion shaft 22 rotates horizontally, the dispersion leaf assembly 23 can be driven to rotate by the engagement of the guide groove 221 and the guide slider 2311, so as to disperse the solution containing residues in the solution dispersion cylinder 21 through the blades 232;

[0029] The top of the blade tube 231 is rotatably connected with a threaded ring 24, and the threaded ring 24 is threadedly engaged with the top of the solution dispersion shaft 22. When the threaded ring 24 is rotated, the threaded rotation between it and the solution dispersion shaft 22 can drive the dispersion blade assembly 23 to move up and down to adjust the position. When the dispersion blade assembly 23 is located at the top of the solution dispersion tube 21 shown in the figure, the stirring effect on the lower layer of the solution dispersion tube 21 is the lowest, and the large particle residues are therefore settled to form a turbid layer liquid, and the upper layer is a clear layer liquid with only small particle residues suspended; one end of the turbid liquid pipe 26 is connected to the solution dispersion tube 21 and extends to the lower turbid layer liquid of the solution dispersion tube 21, and the other end of the turbid liquid pipe 26 is connected to the filter tube 31 and extends to the top of the coarse filter 33, and the turbid liquid of the turbid layer liquid is transported to the filter tube 31 through the turbid liquid pipe 26 for coarse filtration. One end of the clear liquid pipe 27 is connected to the solution dispersion cylinder 21 and extends to the upper clear layer liquid of the solution dispersion cylinder 21, and the other end of the clear liquid pipe 27 is connected to the filter cylinder 31 and extends to the top of the fine filter 34. The clear liquid of the clear layer liquid is transported to the filter cylinder 31 through the clear liquid pipe 27 for fine filtration treatment.

[0030] The filter mechanism 3 includes a filter cartridge 31, and a partition plate 32 is fixedly connected to the interior of the filter cartridge 31, and the interior of the filter cartridge 31 is divided into an upper and lower double layer by the partition plate 32. A fine filter screen 34 is installed in the upper layer, and a coarse filter screen 33 is installed in the lower layer. A coarse residue discharge pipe 35 is connected to the filter cartridge 31 and is located on the upper side of the coarse filter screen 33, and a fine residue discharge pipe 36 is connected to the filter cartridge 31 and is located on the upper side of the fine filter screen 34. One end of the circulation pipe 37 is located on the lower side of the coarse filter screen 33 and the other end is located on the upper side of the fine filter screen 34, and a filtrate discharge pipe 38 is connected to the filter cartridge 31 and is located on the lower side of the fine filter screen 34. The above-mentioned pipelines can be installed with control valves accordingly, which are not described here because they are existing technologies.

[0031] The working principle of this embodiment is as follows: the heat exchange solution of the acid-making process of complex sulfur-containing flue gas is discharged from the heat exchanger and sent to the solution dispersion cylinder 21, the output shaft of the motor 25 drives the solution dispersion shaft 22 to rotate, and the engagement of the guide slide groove 221 and the guide slider 2311 drives the dispersion leaf assembly 23 to rotate, so as to disperse the solution containing residues in the solution dispersion cylinder 21, and the dispersed solution is then sent to the filtering mechanism 3 for filtering and treatment, and finally returns to the heat exchanger for secondary heat exchange;

[0032] Based on the above, this embodiment has two filtering modes for the solution, which can be changed and switched by adjusting the position of the dispersion leaf assembly 23, as follows:

[0033] When the dispersion blade assembly 23 is located at a high position of the solution dispersion cylinder 21 as shown in the figure, the stirring effect on the lower layer of the solution dispersion cylinder 21 is the lowest, and the large particle residues are therefore settled to form a turbid layer liquid, which enters the filter cylinder 31 through the turbid liquid pipe 26 and is filtered through the coarse filter 33. The filtered large particle residues are discharged through the coarse residue discharge pipe 35, and the clear liquid formed by the filtration is sent to the top side of the filter cylinder 31 through the circulation pipe 37 and finely filtered by the fine filter 34. The filtered small particle residues are discharged through the fine residue discharge pipe 36, and the solution is refluxed to the heat exchanger through the filtrate discharge pipe 38 for secondary heat exchange;

[0034] When the dispersion blade assembly 23 is adjusted downward, the stirring effect in the solution dispersion cylinder 21 is approximately the same, and the solution is not stratified. The valve on the clear liquid pipe 27 is closed, and the solution enters the bottom side of the filter cylinder 31 through the turbid liquid pipe 26 and is first roughly filtered through the coarse filter 33, and large particles of impurities are discharged through the coarse residue discharge pipe 35. The solution after coarse filtration flows back to the top side of the filter cylinder 31 through the circulation pipe 37 and is finely filtered through the fine filter 34. Small particles of residue are discharged through the fine residue discharge pipe 36, and the solution flows back to the heat exchanger through the filtrate discharge pipe 38 for secondary heat exchange.

[0035] In summary, the solution drawn out from the heat exchanger can be pre-dispersed by the solution dispersion mechanism 2, and the dispersed solution can be filtered by the filtering mechanism 3. The treated solution is then returned to the heat exchanger for secondary heat exchange to reduce or avoid blockage and increase the service life of the heat exchanger. In addition, with the adjustment of the vertical position of the dispersion leaf assembly 23, the solution in the solution dispersion cylinder 21 can be divided into two layers of turbid and clear, and the two layers of solution can be filtered respectively by the coarse filter mesh 33 and the fine filter mesh 34, so that the filtering effect is better.

[0036] The above-mentioned specific embodiments are only several optional embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. Liquid filtration device for heat exchange of sulfuric acid from complex sulfur-containing flue gas, characterized in that: include: A solution dispersing mechanism (2) for stirring and breaking up a solution and selectively separating the solution, the solution dispersing mechanism (2) comprising a solution dispersing cylinder (21), a solution dispersing shaft (22) that rotates horizontally in the solution dispersing cylinder (21), and a dispersing blade assembly (23) that can be adjusted up and down along the solution dispersing shaft (22); A filtering mechanism (3) for performing filtering treatments of different levels on solutions of different liquid layers, the filtering mechanism (3) comprising a filtering cartridge (31), a partition plate (32) disposed inside the filtering cartridge (31) for dividing the internal space into a plurality of parts, and a coarse filter screen (33) and a fine filter screen (34) respectively located on the upper and lower sides of the partition plate (32).

2. The liquid filtration device for heat exchange of sulfuric acid from complex sulfur-containing flue gas according to claim 1 is characterized in that: The dispersion blade assembly (23) comprises a blade cylinder (231) which is slidably engaged with the solution dispersion shaft (22) and a plurality of blades (232) mounted on the outer wall of the blade cylinder (231).

3. The liquid filtration device for heat exchange of sulphuric acid from complex sulfur-containing flue gas according to claim 2 is characterized in that: The inner wall of the impeller (231) is fixedly connected with a guide slider (2311), and the outer wall of the solution dispersion shaft (22) is provided with a guide groove (221) for the guide slider (2311) to slide vertically.

4. The liquid filtration device for heat exchange of sulphur-containing flue gas in acid production according to claim 3 is characterized in that: The top end of the impeller (231) is rotatably connected to a threaded ring (24), and the threaded ring (24) is threadably screwed and sleeved with the top end of the solution dispersion shaft (22).

5. The liquid filtration device for heat exchange of sulfuric acid from complex sulfur-containing flue gas according to claim 4 is characterized in that: The solution dispersing mechanism (2) comprises a motor (25) fixedly connected to the top of the solution dispersing cylinder (21), and the bottom end of the output shaft of the motor (25) is coaxially fixedly connected to the top end of the solution dispersing shaft (22).

6. The liquid filtration device for heat exchange of sulphur-containing flue gas in acid production according to claim 5 is characterized in that: The solution dispersion mechanism (2) comprises a turbid liquid tube (26), one end of which is connected to the solution dispersion cylinder (21) and extends to the lower turbid liquid of the solution dispersion cylinder (21), and the other end of which is connected to the filter cylinder (31) and extends to the top of the coarse filter screen (33).

7. The liquid filtering device for heat exchange of complex sulfur-containing flue gas acid production according to claim 6 is characterized in that: The solution dispersion mechanism (2) comprises a clear liquid pipe (27), one end of which is connected to the solution dispersion cylinder (21) and extends to the upper clear liquid of the solution dispersion cylinder (21), and the other end of which is connected to the filter cylinder (31) and extends to the top of the fine filter screen (34).

8. The liquid filtration device for heat exchange of sulphuric acid from complex sulfur-containing flue gas according to claim 7, characterized in that: The filtering mechanism (3) comprises a coarse slag discharge pipe (35) and a fine slag discharge pipe (36); the coarse slag discharge pipe (35) is connected to the filter cylinder (31) and is located on the upper side of the coarse filter screen (33); and the fine slag discharge pipe (36) is connected to the filter cylinder (31) and is located on the upper side of the fine filter screen (34).

9. The liquid filtering device for heat exchange of sulfuric acid from complex sulfur-containing flue gas according to claim 8, characterized in that: The filtering mechanism (3) comprises a circulation pipe (37) with both ends connected to the filter cartridge (31); one end of the circulation pipe (37) is located at the lower side of the coarse filter screen (33) and the other end is located at the upper side of the fine filter screen (34).

10. The liquid filtration device for heat exchange of sulphur-containing flue gas in acid production according to claim 9, characterized in that: The filtering mechanism (3) comprises a filtrate discharge pipe (38), wherein the filtrate discharge pipe (38) is connected to the filter cartridge (31) and is located at the lower side of the fine filter screen (34).

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