CN218653012U - Dilute acid concentration device - Google Patents

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a dilute acid concentration device. Including lower tube box (1), shell (2), tube-sheet heat exchanger (3) and upper tube box (4); lower tube box (1), shell (2) and upper tube box (4) The tube-sheet heat exchanger (3) is vertically fixed in the shell (2); the tube-side of the tube-sheet heat exchanger (3) adopts an acid distributor, and the acid flows down evenly along the inner wall of the heat exchange tube The shell (2) is provided with a plurality of support plates (33), and the shell side is divided into multi-layer heat exchange chambers by the support plates (33). The utility model has the advantages of good heat exchange effect, uniform heating, high concentration efficiency and meeting the requirements for the use of sulfuric acid.

Description

A dilute acid concentration device

technical field

The utility model relates to the technical field of heat exchangers, in particular to a dilute acid concentration device.

Background technique

The wet-feed acid production process characterized by "slurry feed, oxygen-enriched combustion, two-turn and two-suction" is currently the mainstream process for treating by-products of low-purity sulfur and desulfurization waste liquid in the coke oven gas ammonia wet catalytic oxidation desulfurization process , It is also the preferred process for domestic medium and large iron and steel complexes or coking plants. The significant technical advantages of this process are short process flow, simple operation, high level of automation, and good continuous stability; however, the amount of by-product dilute sulfuric acid is relatively large.

In most cases, the by-product dilute sulfuric acid can be sent to the ammonium sulfate unit for recycling; but when the coking scale corresponding to the ammonium sulfate unit is much smaller than the coking scale corresponding to the acid production unit, or when high-sulfur coal is used for coking, resulting in When the hydrogen sulfide content in the gas is too high, dilute sulfuric acid cannot be sent to the ammonium sulfate unit for recycling, and there is a relative surplus.

At present, it is an urgent technical problem to develop dilute acid concentrators to deal with relatively surplus dilute sulfuric acid.

Utility model content

In order to overcome the deficiencies of the prior art, the utility model provides a dilute acid concentration device, which has the advantages of good heat exchange effect, uniform heating, high concentration efficiency and meeting the requirements for the use of sulfuric acid.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

A dilute acid concentration device, comprising a lower tube box (1), a shell (2), a tube-sheet heat exchanger (3) and an upper tube box (4); a lower tube box (1), a shell (2) and The upper tube box (4) is connected sequentially from bottom to top, and the tube-sheet heat exchanger (3) is vertically fixed in the shell (2); the tube-side of the tube-sheet heat exchanger (3) adopts an acid distributor, and the acid The inner wall of the heat exchange tube forms a film and flows down; the casing (2) is provided with a plurality of support plates (33), and the shell side is divided into multi-layer heat exchange chambers by the support plates (33).

As a further improvement of the utility model, the lower pipe box (1) includes the lower pipe box manhole (11), the lower pipe box acid outlet (12), the lower pipe box head (13), the lower pipe box cylinder (14) with downtube flange (15).

The axis of the lower tube box body (14) is vertical, the lower tube box flange (15) is fixed on the top of the lower tube box body (14), and the lower tube box head (13) is fixed on the lower tube box body (14) At the bottom, the lower pipe box manhole (11) is fixedly connected to the side wall of the lower pipe box cylinder (14); the lower pipe box acid outlet (12) is fixedly connected to the bottom of the lower pipe box head (13); the lower pipe box (1) Sprayed PTFE inside.

As a further improvement of the utility model, the housing (2) includes a housing flange (21), a flue gas outlet (22), a housing cylinder (23), a connecting pipe (24), a support (25) and a smoke outlet. Air inlet (26).

The axis of the shell cylinder (23) is vertical, the shell flange (21) is fixedly connected to both ends of the shell cylinder (23), the smoke outlet (22), the connecting pipe (24), the support (25), The flue gas inlet (26) is fixedly connected to the side wall of the shell cylinder (23), and the flue gas outlet (22) is located below the flue gas inlet (26).

As a further improvement of the utility model, the tube-sheet heat exchanger (3) includes an upper tube sheet (31), a heat exchange tube (32), a support plate (33), a lower tube sheet (34), a tie rod (35), a fixed Distance tube (36), last tube plate fixture (37), lower tube plate fixture (38) and support plate fixture (39).

A plurality of support plates (33) are fixed horizontally in the casing (2), the top ends of the heat exchange tubes (32) are fixed on the upper tube plate (31) through the upper tube plate fixing piece (37), and the heat exchange tubes (32 ) bottom end is affixed to the lower tube plate (34) through the lower tube plate fixing piece (38), and the middle part is fixedly connected to the support plate (33) through the support plate fixing piece (39); ) threaded connection, and the pull rod (35) is affixed on the support plate (33).

As a further improvement of the utility model, the heat exchange tube (32) is made of quartz glass material, and the upper part is provided with a raised part; the upper tube plate (31) and the lower tube plate (34) have stepped holes, sprayed with polytetrafluoroethylene vinyl.

As a further improvement of the utility model, the upper tube sheet fixing part (37) includes a heat exchange tube fixing part (41), a tube sheet filler (42), a fastener (43), an acid distributor (44), a cover board (45).

The heat exchange tube fixing part (41) is provided with an internal thread for fixing the heat exchange tube (32), and is provided with an external thread for connecting the fastener (43); the cover plate (45) is fixed on the acid distributor (44) On, the fastener (43) is threaded with the acid distributor (44).

As a further improvement of the utility model, the lower tube sheet fixing part (38) includes a heat exchange tube fixing part (41), a tube sheet filler (42), and a fastener (43).

The heat exchange tube fixing part (41) is provided with an internal thread for fixing the heat exchange tube (32), and is provided with an external thread for connecting the fastener (43).

As a further improvement of the utility model, the support plate fixing part (39) is an annular clamp structure; the lower part is opened for installation on the support plate (33), the inner diameter is larger than the outer diameter of the heat exchange tube (32), and the outer diameter of the clamp is The diameter is smaller than the opening of the support plate (33).

As a further improvement of the utility model, the heat exchange tube (32) is made of quartz glass material, the upper tube plate fixing part (37) is made of polytetrafluoroethylene material, and the lower tube plate fixing part (38) is made of polytetrafluoroethylene material. It is made of tetrafluoroethylene material, and the support plate fixing part (39) is made of polytetrafluoroethylene material.

As a further improvement of the utility model, the upper pipe box (4) includes the upper pipe box flange (51), the distribution ceramic ring packing and support (52), the upper pipe box manhole (53), the gas outlet (54), the upper Tube box head 55, mist trap ceramic ring filler and support (56), acid inlet and nozzle (57) and upper tube box cylinder (58);

The axis of the upper tube box body (58) is vertical, the upper tube box flange (51) is fixedly connected to the bottom end of the upper tube box body (58), and the upper tube box head (55) is fixedly connected to the upper tube box body (58) top; the upper pipe box manhole (53) is fixedly connected to the side wall of the upper pipe box cylinder (58), and the gas outlet (54) is fixedly connected to the top of the upper pipe box head (55); And support (56), acid inlet and nozzle (57), distribution ceramic ring packing and support (52) are fixed in the upper tube box cylinder (58) from top to bottom in sequence; the upper tube box (4) is sprayed with poly Tetrafluoroethylene.

Compared with the prior art, the beneficial effects of the utility model are:

1) The tube side of the tube-sheet heat exchanger of the utility model adopts an acid distributor, and the sulfuric acid in the upper tube box is distributed to the filler through the nozzle, evenly distributed to the upper tube plate, and then distributed to the inner wall of the heat exchange tube through the acid distributor, and the thin film The state flows down along the heat exchange tube, and the heat exchange effect is good.

2) There are multiple support plates in the shell, and the shell side is divided into multi-layer heat exchange chambers by the support plates. In the first heat exchange chamber, the hot flue gas from the converter passes through the heat exchange tubes horizontally, and after heat exchange, it passes through the outlet Entering the second heat exchange chamber through the connecting pipe, the flue gas at the shell side evenly heats the sulfuric acid in the heat exchange tube, and the flue gas at the shell side uniformly concentrates the sulfuric acid.

3) The heat exchange tube of the utility model is made of quartz glass material, and the contact part is made of polytetrafluoroethylene material to ensure the safety of the glass tube when it is installed and expanded. The tube box and tube sheet are sprayed with polytetrafluoroethylene to meet the requirements of sulfuric acid.

4) The utility model has high concentration efficiency and compact structure.

Description of drawings

Fig. 1 is a schematic front view of the structure of the utility model;

Fig. 2 is a structural schematic diagram of the upper tube plate fixing part of the utility model;

Fig. 3 is a structural schematic diagram of the lower tube plate fixing part of the utility model;

Fig. 4 is a structural schematic diagram of a support plate fixture of the present invention;

Fig. 5 is a schematic top view of the upper tube plate structure of the utility model;

Fig. 6 is a schematic partial front view of the structure of the upper tube plate of the utility model;

Fig. 7 is a schematic top view of the structure of the lower tube plate of the utility model;

Fig. 8 is a schematic partial front view of the structure of the lower tube plate of the utility model;

Fig. 9 is a schematic top view of the structure of the support plate of the present invention;

Fig. 10 is a schematic front view of the structure of the acid distributor of the present invention;

Fig. 11 is A-A sectional view of Fig. 10;

Fig. 12 is a B-B sectional view of Fig. 10;

Fig. 13 is a C-C sectional view of Fig. 10;

Fig. 14 is a D-D sectional view of Fig. 10;

Fig. 15 is a schematic front view of the structure of the heat exchange tube fixture of the present invention;

Fig. 16 is a schematic top view of the structure of the heat exchange tube fixture of the present invention;

Fig. 17 is a schematic front view of the structure of the support plate fixture of the utility model;

Fig. 18 is a schematic top view of the structure of the support plate fixture of the present invention;

Fig. 19 is a schematic front view of the structure of the heat exchange tube of the present invention;

Fig. 20 is a schematic top view of the structure of the heat exchange tube of the present invention.

In the figure: 1-lower tube box 2-shell 3-tube sheet heat exchanger 4-upper tube box 11-lower tube box manhole 12-lower tube box acid outlet 13-lower tube box head 14-lower tube box Cylinder 15-lower tube box flange 21-shell flange 22-flue gas outlet 23-shell cylinder 24-communicating pipe 25-support 26-flue gas inlet 31-upper tube plate 32-heat exchange tube 33 - Support plate 34 - Lower tube plate 35 - Tie rod 36 - Spacer tube 37 - Upper tube plate fixing part 38 - Lower tube plate fixing part 39 - Supporting plate fixing part 41 - Heat exchange tube fixing part 42 - Tube plate packing 43 - Fastener 44-acid distributor 45-cover plate 51-top tube box flange 52-distribution ceramic ring packing and support 53-top tube box manhole 54-gas outlet 55-top tube box head 56-fog trapping porcelain Ring packing and support 57-acid inlet and nozzle 58-upper pipe box cylinder

Detailed ways

The implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

In the description of the present utility model, unless otherwise stated, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer ", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description. It does 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 should not be construed as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integratively connected; it can be mechanically or electrically connected; it can be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

【Example】

As shown in Figure 1-20, a dilute acid concentration device includes a lower tube box (1), a shell (2), a tube-sheet heat exchanger (3) and an upper tube box (4). The lower tube box (1), the shell (2) and the upper tube box (4) are sequentially connected from bottom to top, and the tube-sheet heat exchanger (3) is vertically fixed in the shell (2).

The lower pipe box (1) includes the lower pipe box manhole (11), the lower pipe box acid outlet (12), the lower pipe box head (13), the lower pipe box cylinder (14) and the lower pipe box flange (15 ). The lower pipe box cylindrical body (14) is a circular cylindrical body, and its axis is vertical. The lower tube box flange (15) is affixed to the top of the lower tube box cylinder (14), and the lower tube box head (13) is affixed to the bottom of the lower tube box cylinder (14). The lower tube box manhole (11) is fixedly connected on the lower tube box cylindrical body (14) side wall, and the lower tube box acid outlet (12) is fixedly connected with the lower tube box head (13) bottom. Spray polytetrafluoroethylene in the lower pipe box (1).

The casing (2) includes a casing flange (21), a flue gas outlet (22), a casing cylinder (23), a connecting pipe (24), a support (25) and a flue gas inlet (26). The shell cylinder (23) is a circular cylinder with a vertical axis. The two support plates (33) are parallel to each other and are horizontally fixed in the shell cylinder (23), dividing the interior of the shell (2) into three layers, and the shell side is divided into multi-layer heat exchange chambers by the support plates (33) . The two shell flanges (21) are fixedly connected to the top and bottom of the shell body (23) respectively, the smoke outlet (22), the connecting pipe (24), the support (25), the smoke inlet (26) It is fixedly connected to the side wall of the shell cylinder (23), and the smoke outlet (22) is located below the smoke inlet (26). The flue gas enters from the upper flue gas inlet (26), flows laterally, enters the lower layer through the communication pipe (24), flows laterally, and finally flows out from the flue gas outlet (22). The flue gas outlet (22) and the flue gas inlet (26) are also used as the installation port and the inspection port simultaneously.

The tube-sheet heat exchanger (3) includes an upper tube sheet (31), heat exchange tubes (32), support plate (33), lower tube sheet (34), tie rods (35), spacer tubes (36), upper tube Plate fixture (37), lower tube plate fixture (38) and support plate fixture (39). The top ends of the heat exchange tubes (32) are affixed to the upper tube sheet (31) through the upper tube sheet fixture (37), and the bottom ends of the heat exchange tubes (32) are fixed to the lower tube sheet (38) through the lower tube sheet fixture (38). 34), the middle part is affixed on the support plate (33) by the support plate fixture (39). Pull bar (35) is threadedly connected with distance tube (36), and pull bar (35) is affixed on the support plate (33), and distance tube (36) top is affixed in upper tube plate (31) bottom surface. The heat exchange tube (32) is made of quartz glass material, and the upper part is provided with a raised part. Upper tube plate (31), lower tube plate (34) perforate is stepped, and sprays polytetrafluoroethylene.

The upper tube sheet fixing part (37) includes a heat exchange tube fixing part (41), a tube sheet filler (42), a fastener (43), an acid distributor (44), and a cover plate (45). The inner diameter of the heat exchange tube fixture (41) is slightly larger than the outer diameter of the heat exchange tube (32), and is provided with an internal thread for fixing the heat exchange tube (32), and an external thread for connecting the fastener (43). The cover plate (45) is welded on the top of the acid distributor (44), and the fastener (43) is threadedly connected with the acid distributor 44. Through the acid distributor (44), the sulfuric acid is distributed to the inner wall of the heat exchange tube (32) in a falling film state. The material of the upper tube sheet fixture (37) is polytetrafluoroethylene. The upper tube sheet (31) is provided with a groove, and the tube sheet filler (42) is placed in the groove, and is fixed with the heat exchange tube fixture (41) by a fastener (43).

The lower tube sheet fixing part (38) includes a heat exchange tube fixing part (41), a tube sheet packing (42), and a fastener (43). The inner diameter of the heat exchange tube fixture (41) is slightly larger than the outer diameter of the heat exchange tube 32, and is provided with an internal thread for fixing the heat exchange tube (32), and an external thread for connecting the fastener (43). The lower tube plate fixing part (38) is made of polytetrafluoroethylene.

The support plate fixing part (39) is an annular clamp structure with a gap at the bottom for installation on the support plate (33), the inner diameter is slightly larger than the outer diameter of the heat exchange tube (32), and the outer diameter of the clamp is slightly smaller than that of the support plate (33). ) hole. Support plate fixture (39) material polytetrafluoroethylene.

The lower tube plate (34) and the shell flange (21) at the bottom are fixedly connected on the lower tube box flange (15) by bolts.

The upper pipe box (4) includes the upper pipe box flange (51), the distribution ceramic ring packing and support (52), the upper pipe box manhole (53), the gas outlet (54), the upper pipe box head (55), Fog-trap ceramic ring filler and support (56), acid inlet and nozzle (57) and upper pipe box cylinder (58).

The upper pipe box body (58) is a cylindrical structure with a vertical axis. The upper tube box flange (51) is fixedly connected to the bottom of the upper tube box cylinder (58), and the upper tube plate (31) and the upper tube box flange (51) are fixedly connected to the top shell flange (21 )superior.

The upper pipe box head (55) is fixedly connected to the top of the upper pipe box cylinder (58), the gas outlet (54) is fixedly connected to the top of the upper pipe box head (55), and the two upper pipe box manholes (53) one Up and down are affixed to the side wall of the upper tube box cylinder (58).

The mist trapping ceramic ring filler and support (56), the acid inlet and nozzle (57), the distribution ceramic ring filler and support (52) are fixedly connected in the upper pipe box cylinder (58) in sequence from top to bottom. The inside of the upper pipe box (4) is sprayed with polytetrafluoroethylene.

The flue gas inlet temperature should be lower than the use temperature of PTFE.

The sulfuric acid in the upper tube box (4) is distributed to the filler through the acid inlet and the nozzle (57), evenly distributed to the upper tube sheet (31), and then distributed to the inner wall of the heat exchange tube (32) through the acid distributor (44), and the thin film The state flows down the heat exchange tubes. Due to the support plate (33), the shell side is divided into several heat exchange chambers. In the first heat exchange chamber, the hot flue gas from the converter passes through the heat exchange tube (32) horizontally, and passes through the connecting pipe at the outlet after heat exchange. (24) Entering the second heat exchange chamber, the flue gas at the shell side evenly heats the sulfuric acid in the heat exchange tube, and the flue gas is sent back to the converter after heat exchange. The concentrated sulfuric acid enters the sulfuric acid tank. If the acid concentration does not meet the requirements, the concentrated sulfuric acid that does not meet the requirements is sent back to the acid inlet for concentration. The gas concentrated by dilute sulfuric acid is sent to the tail gas treatment device after demisting.

The heat exchange tube (32) of the utility model is made of quartz glass material, and the contact part is made of polytetrafluoroethylene material, so as to ensure that the glass tube is installed and expanded safely. The tube box and tube sheet are sprayed with polytetrafluoroethylene to meet the requirements of sulfuric acid. The utility model has high concentration efficiency and compact structure.

The utility model has the advantages of good heat exchange effect, uniform heating, high concentration efficiency and meeting the requirements for the use of sulfuric acid.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. The equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (10)

1. A dilute acid concentration device is characterized in that: comprises a lower tube box (1), a shell (2), a tube-plate heat exchanger (3) and an upper tube box (4); the lower tube box (1), the shell (2) and the upper tube box (4) are sequentially connected from bottom to top, and the tube plate heat exchanger (3) is vertically fixed in the shell (2); the tube side of the tube plate heat exchanger (3) adopts an acid distributor, and acid uniformly flows down along the inner wall of the heat exchange tube; a plurality of supporting plates (33) are arranged in the shell (2), and the shell pass is divided into a plurality of layers of heat exchange cavities through the supporting plates (33).

2. The dilute acid concentration device according to claim 1, wherein: the lower tube box (1) comprises a lower tube box manhole (11), a lower tube box acid outlet (12), a lower tube box sealing head (13), a lower tube box cylinder body (14) and a lower tube box flange (15);

the axis of a lower tube box cylinder (14) is vertical, a lower tube box flange (15) is fixedly connected to the top end of the lower tube box cylinder (14), a lower tube box end socket (13) is fixedly connected to the bottom of the lower tube box cylinder (14), and a lower tube box manhole (11) is fixedly connected to the side wall of the lower tube box cylinder (14); the acid outlet (12) of the lower tube box is fixedly connected to the bottom of the seal head (13) of the lower tube box; the lower tube box (1) is internally sprayed with polytetrafluoroethylene.

3. The dilute acid concentration device according to claim 1, wherein: the shell (2) comprises a shell flange (21), a smoke outlet (22), a shell cylinder (23), a communicating pipe (24), a support (25) and a smoke inlet (26);

the axis of the shell cylinder (23) is vertical, the shell flange (21) is fixedly connected to two ends of the shell cylinder (23), the flue gas outlet (22), the communicating pipe (24), the support (25) and the flue gas inlet (26) are fixedly connected to the side wall of the shell cylinder (23), and the flue gas outlet (22) is located below the flue gas inlet (26).

4. The dilute acid concentration device according to claim 1, wherein: the tube-plate heat exchanger (3) comprises an upper tube plate (31), a heat exchange tube (32), a supporting plate (33), a lower tube plate (34), a pull rod (35), a distance tube (36), an upper tube plate fixing piece (37), a lower tube plate fixing piece (38) and a supporting plate fixing piece (39);

a plurality of supporting plates (33) are horizontally and fixedly connected in the shell (2), the top end of the heat exchange tube (32) is fixedly connected on the upper tube plate (31) through an upper tube plate fixing piece (37), the bottom end of the heat exchange tube (32) is fixedly connected on the lower tube plate (34) through a lower tube plate fixing piece (38), and the middle part of the heat exchange tube is fixedly connected on the supporting plates (33) through supporting plate fixing pieces (39); the pull rod (35) is in threaded connection with the distance tube (36), and the pull rod (35) is fixedly connected to the supporting plate (33).

5. The dilute acid concentration device according to claim 4, wherein: the heat exchange tube (32) is made of quartz glass materials, and a convex part is arranged at the upper part of the heat exchange tube (32); the holes of the upper tube plate (31) and the lower tube plate (34) are in a step shape, and polytetrafluoroethylene is sprayed.

6. The dilute acid concentration device according to claim 4, wherein: the upper tube plate fixing part (37) comprises a heat exchange tube fixing part (41), a tube plate filler (42), a fastener (43), an acid distributor (44) and a cover plate (45);

the heat exchange tube fixing part (41) is provided with an internal thread for fixing the heat exchange tube (32) and an external thread for connecting a fastening piece (43); the cover plate (45) is fixedly connected to the acid distributor (44), and the fastener (43) is in threaded connection with the acid distributor (44).

7. The dilute acid concentration device according to claim 4, wherein: the lower tube plate fixing part (38) comprises a heat exchange tube fixing part (41), tube plate fillers (42) and fasteners (43);

the heat exchange tube fixing part (41) is provided with an internal thread for fixing the heat exchange tube (32) and an external thread for connecting a fastening piece (43).

8. The dilute acid concentration device according to claim 4, wherein: the supporting plate fixing piece (39) is of an annular hoop structure; the lower part is provided with a notch for being arranged on the supporting plate (33), the inner diameter of the notch is larger than the outer diameter of the heat exchange tube (32), and the outer diameter of the hoop is smaller than the opening of the supporting plate (33).

9. The dilute acid concentration device according to claim 4, wherein: the heat exchange tube (32) is made of quartz glass materials, the upper tube plate fixing piece (37) is made of polytetrafluoroethylene materials, the lower tube plate fixing piece (38) is made of polytetrafluoroethylene materials, and the supporting plate fixing piece (39) is made of polytetrafluoroethylene materials.

10. The dilute acid concentration device according to claim 4, wherein: the upper pipe box (4) comprises an upper pipe box flange (51), a distribution ceramic ring packing and support (52), an upper pipe box manhole (53), a gas outlet (54), an upper pipe box sealing head (55), a mist catching ceramic ring packing and support (56), an acid inlet and spray head (57) and an upper pipe box barrel body (58);

the axis of the upper tube box cylinder body (58) is vertical, an upper tube box flange (51) is fixedly connected to the bottom end of the upper tube box cylinder body (58), and an upper tube box end socket (55) is fixedly connected to the top of the upper tube box cylinder body (58); the manhole (53) of the upper pipe box is fixedly connected with the side wall of the cylinder body (58) of the upper pipe box, and the gas outlet (54) is fixedly connected with the top of the end enclosure (55) of the upper pipe box; the mist catching ceramic ring packing and support (56), the acid inlet and spray head (57) and the distributed ceramic ring packing and support (52) are fixedly connected in the upper tube box cylinder (58) from top to bottom in sequence; and polytetrafluoroethylene is sprayed inside the upper pipe box (4).

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