Sodium nitrate granulation tail gas scrubber

Abstract

The utility model discloses a sodium nitrate granulation tail gas scrubber which is characterized in that an expanded section cylinder is arranged on the outer side of a tower body at the top of a granulation tower, a filler box is fixed between the tower body at the top of the granulation tower and the expanded section cylinder, and the filler box and the tower body are obliquely mounted at a certain angle; the spray washing device is fixed in the expansion section cylinder body and is positioned obliquely above the filler box, and a tail gas outlet pipe is arranged on one side of the expansion section cylinder body; the blade backwashing device is welded on the tail gas outlet pipe; and the blade box short section is welded on the blade box and is connected with the tail gas outlet pipe and the fan inlet connecting flange through flanges. According to the utility model, the running resistance of the granulation tower is thoroughly solved, sodium nitrate dust in the tail gas is recovered, the dust removal effect is good, and the tail gas is discharged after reaching the standard.

Description

Technical Field

[0001] The utility model belongs to the field of tail gas purification, and particularly relates to a tail gas purification scrubber for sodium nitrate granulation. Background Art

[0002] The sodium nitrate granulation system consists of a NaNO3 melting and granulation system and a molten salt heating system. NaNO3 is indirectly heated and melted by high-temperature molten salt while removing moisture. At this time, the material humidity in the granulation tower is relatively small. The molten NaNO3 jet formed through the small holes of the granulation nozzle is dispersed into droplets of similar size by the action of the dispersion device. The droplets are cooled and solidified when contacting the countercurrent upward air during the falling process in the granulation tower, and uniform-sized NaNO3 particles are obtained at the bottom of the tower. The NaNO3 particles are cooled by a fluidized bed cooler and then packaged. A stream of granulation tail gas is generated at the top of the tower, and sodium nitrate dust is inevitably entrained in the tail gas.

[0003] Therefore, a simple dust removal and washing device is installed at the top of the granulation tower, but there are problems such as easy blockage and large operating resistance, which affect the normal operation of the granulation tower. In order to reduce production resistance, the production unit removed it, resulting in the sodium nitrate dust in the exhausted tail gas not being recoverable. Most of it floats in the form of white particles on the device and the fan side, not only causing waste of sodium nitrate raw materials, harming the health of inspection and maintenance personnel, but also polluting the environment. Therefore, it is imperative to develop a new type of sodium nitrate granulation tail gas scrubber. Summary of the Invention

[0004] In order to solve the problems of large operating resistance of the granulation tower, poor dust removal effect, and non-recovery of sodium nitrate dust in the tail gas, the utility model provides a sodium nitrate granulation tail gas scrubber, which adopts a spray washing device, high-efficiency packing, a blade backwashing device, and a high-efficiency blade demister to completely solve the operating resistance of the granulation tower, recover the sodium nitrate dust in the tail gas, and make the tail gas meet the discharge standards.

[0005] The technical solution of the utility model is: a sodium nitrate granulation tail gas scrubber, including a granulation tower, characterized in that an enlarged section cylinder body is provided on the outer side of the tower body at the top of the granulation tower, and the packing box is fixed between the tower body at the top of the granulation tower and the enlarged section cylinder body and is installed obliquely; the spray washing device is fixed in the enlarged section cylinder body, located obliquely above the packing box, and a tail gas outlet pipe is provided on one side of the enlarged section cylinder body; the blade backwashing device is welded on the tail gas outlet pipe; blade box short joints are respectively welded at both ends of the blade box and are respectively connected to the flange of the tail gas outlet pipe and the connection flange of the fan inlet, and blades are installed in the blade box.

[0006] Further, the spray washing device is composed of a main spray pipe, spray branch pipes, and spiral nozzles. The spray branch pipes are installed perpendicular to the main spray pipe and connected by flanges. The installation surface of the spray branch pipes is parallel to the packing box surface. The spiral nozzles are installed on the spray branch pipes, and the spray direction is perpendicular to the packing box.

[0007] Further, the packing box is welded by angle steel and covered with a stainless steel mesh around. The stainless steel mesh is welded and fixed to the angle steel. Packing is filled in the packing box, and a packing loading and unloading port is opened on the upper side of the packing box.

[0008] Further, the blade backwashing device is composed of a main washing pipe, washing branch pipes, and nozzles. The spray direction of the nozzles is consistent with the air flow direction.

[0009] The utility model has the following beneficial effects

[0010] (1) By reforming the top of the granulation tower and the tail gas outlet part, the height of the granulation tower is not increased, the equipment transformation cost is low, and inspection and maintenance are convenient.

[0011] (2) The packing 6 is installed in the packing box 5 between the tower body 1 at the top of the granulation tower and the enlarged section cylinder 2, which can prevent the packing washing liquid from flowing into the inner cylinder of the granulation tower. The packing box 5 is installed obliquely at a certain angle with the tower body 1, which can increase the stacking area of the packing and the contact area of gas-liquid.

[0012] (3) The spray washing device 3 is installed between the tower body 1 at the top of the granulation tower and the enlarged section cylinder 2, which can prevent the washing liquid from flowing into the inner cylinder of the granulation tower. It is located obliquely above the packing box 5 and is composed of a main spray pipe 17, spray branch pipes 18, and spiral nozzles 19. The spray direction of the spiral nozzles 19 is perpendicular to the packing box 5, which can evenly spray the washing liquid onto the entire surface of the packing and avoid uneven spraying in local areas.

[0013] (4) The blade backwashing device 7 is installed on the tail gas outlet pipe 8, which can make full use of the existing distance and increase the buffer space of the gas in the blade box 11. The spray direction of the nozzles is consistent with the air flow direction, which can increase the forward kinetic energy of the air flow, make the tiny liquid droplets in the tail gas grow up, facilitate the separation of the liquid droplets, and prevent the blades 12 from being blocked. Description of the Drawings

[0014] Figure 1 is the structural schematic diagram of the utility model;

[0015] Figure 2 is the structural schematic diagram of the packing box 5;

[0016] Figure 3 is Figure 2 the top view of

[0017] Figure 4 is the structural schematic diagram of the spray washing device 3;

[0018] Figure 5 It is a schematic structural diagram of the blade backwashing device 7;

[0019] Explanation of the reference numerals in the attached drawings: tower body 1, enlarged section cylinder 2, spray washing device 3, maintenance manhole 4, stuffing box 5, packing 6, blade backwashing device 7, tail gas outlet pipe 8, blade box short section 9, blade maintenance opening 10, blade box 11, blade 12, fan inlet connection flange 13, angle steel 14, stainless steel mesh 15, packing loading and unloading opening 16, spray main pipe 17, spray branch pipe 18, spiral nozzle 19, flushing main pipe 20, flushing branch pipe 21, nozzle 22. Specific implementation mode

[0020] A sodium nitrate granulation tail gas scrubber of the present utility model realizes the purpose of the present utility model by reforming the existing granulation tower top and tail gas outlet.

[0021] As Figure 1 shown, an enlarged section cylinder 2 is provided on one side of the tower body 1 at the top of the granulation tower. The stuffing box 5 is fixed between the tower body 1 at the top of the granulation tower and the enlarged section cylinder 2, and the stuffing box 5 is installed obliquely at a certain angle with the tower body 1; as Figure 2 、 Figure 3 shown, the stuffing box 5 is welded by angle steel 14, and the periphery is covered with a stainless steel mesh 15. The stainless steel mesh 15 is welded and fixed with the angle steel 14. Packing 6 is filled in the stuffing box 5, and a packing loading and unloading opening 16 is provided on the upper side of the stuffing box.

[0022] As Figure 3 shown, the spray washing device 3 is fixed in the enlarged section cylinder 2, located obliquely above the stuffing box 5, and a tail gas outlet pipe 8 is provided on one side of the enlarged section cylinder 2; the spray washing device 3 is composed of a spray main pipe 17, a spray branch pipe 18, and a spiral nozzle 19. The spray branch pipe 18 is vertically installed and flange-connected with the spray main pipe 17. The installation surface of the spray branch pipe 18 is parallel to the stuffing box surface. The spiral nozzle 19 is installed on the spray branch pipe 18, and some spiral nozzles 19 can be installed on the spray main pipe 17 according to the coverage range, and the spray direction is perpendicular to the stuffing box 5.

[0023] As Figure 4 shown, the blade backwashing device 7 is welded on the tail gas outlet pipe 8 and is composed of a flushing main pipe 20, a flushing branch pipe 21, and a nozzle 22. The spray direction of the nozzle is consistent with the air flow direction.

[0024] Blade box short sections 9 are respectively welded at both ends of the blade box 11 and are respectively connected to the tail gas outlet pipe 8 flange and the fan inlet connection flange 13.

[0025] Blades 12 are installed in the blade box 11. The blades 12 (not limited to single-capsule or double-capsule) are fixed to the blade box 11 by angle steel or tie rods, and the blades are detachable.

[0026] An inspection opening 10 for the convenient disassembly of the blade 12 is installed at the upper part of the blade box 11.

[0027] An inspection manhole 4 is provided on the tower top plate between the tower body 1 and the enlarged section cylinder body 2 at the top of the granulation tower.

[0028] The working process is as follows: The sodium nitrate granulation tail gas reaching the top of the granulation tower enters the enlarged section cylinder body 2 from the annular gap part at the top of the tower body 1. First, it passes through the mist droplets sprayed by the spiral nozzle 19 of the spray washing device 3, so that the tail gas dust particles are wetted, collided and adhered. The large dust particles finally settle under the action of gravity. The gas continues to enter the packing 6, and continues to collide and adhere on the surface of the packing. The mist droplets continue to coalesce and grow to form large droplets, which settle under the action of gravity. The washed tail gas is sprayed by the nozzle 22 of the blade backwashing device 7, and the flow kinetic energy of the air flow increases. After entering the blade box 11 and colliding with the blade 12, it is more conducive to the growth and separation of tiny droplets. At the same time, it can prevent the attachment of granular substances on the blade surface and prevent the blade from being blocked. Finally, the tail gas meets the discharge standards.

Claims

1. A sodium nitrate granulation tail gas scrubber, comprising a granulation tower, characterized in that, An enlarged section cylinder body (2) is arranged outside the tower body (1) at the top of the granulation tower. The packing box (5) is fixed between the tower body (1) at the top of the granulation tower and the enlarged section cylinder body (2) and is installed obliquely. The spray washing device (3) is fixed inside the enlarged section cylinder body (2), located diagonally above the packing box (5). An exhaust gas outlet pipe (8) is arranged on one side of the enlarged section cylinder body (2). The blade backwashing device (7) is welded on the exhaust gas outlet pipe (8). Blade box nipples (9) are welded to both ends of the blade box (11) respectively and are connected to the flange of the exhaust gas outlet pipe (8) and the connection flange (13) of the fan inlet. Blades (12) are installed in the blade box (11).

2. The sodium nitrate granulation tail gas scrubber according to claim 1, characterized in that, The spray washing device (3) consists of a spray main pipe (17), spray branch pipes (18), and spiral nozzles (19). The spray branch pipes (18) are installed perpendicular to the spray main pipe (17) and are connected by flanges. The installation surface of the spray branch pipes (18) is parallel to the surface of the packing box. The spiral nozzles (19) are installed on the spray branch pipes (18), and the spray direction is perpendicular to the packing box (5).

3. The sodium nitrate granulation tail gas scrubber according to claim 1, characterized in that, The packing box (5) is welded by angle steels (14), and stainless steel meshes (15) cover the periphery. The stainless steel meshes (15) are welded and fixed to the angle steels (14). Packing (6) is filled in the packing box (5), and a packing loading and unloading opening (16) is opened on the upper side of the packing box.

4. The sodium nitrate granulation tail gas scrubber according to claim 1, characterized in that, The blade backwashing device (7) consists of a washing main pipe (20), washing branch pipes (21), and nozzles (22). The spray direction of the nozzles is the same as the air flow direction.

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