Ammonia removal device and process for producing hydrocyanic acid

Abstract

The invention relates to the technical field of chemical production, and specifically discloses an ammonia removal device for hydrocyanic acid production, comprising: a tower body, wherein the bottom of the side wall of the tower body is connected to a hydrocyanic acid synthesis gas feed pipe, the top of the side wall of the tower body is connected to an acid liquid feed pipe, the top of the tower body is connected to a hydrocyanic acid synthesis gas discharge pipe, and the bottom of the tower body is connected to an acid liquid discharge pipe; a packing rack, wherein the packing racks are multiple and vertically and evenly arranged in the tower body; and a demister, wherein the demister comprises a rotating shaft vertically rotatably connected in the tower body, a scraper arranged on the rotating shaft and capable of scraping along the wall surface of the packing rack, and a driving mechanism for driving the rotating shaft to rotate, thereby solving the problem that the packing rack in a traditional ammonia removal tower is prone to accumulate foam, affecting the normal interaction between the acid liquid and the hydrocyanic acid synthesis gas, and causing the acid liquid to reduce the absorption effect of ammonia.

Description

Technical Field

[0001] The present application relates to the technical field of chemical production, and specifically discloses an ammonia removal device and process for producing hydrocyanic acid. Background Art

[0002] Hydrocyanic acid is a colorless liquid with molecular formula HCN, molecular weight 27.03, boiling point 26°C, bitter almond flavor, and is miscible with water. Hydrocyanic acid is a basic chemical raw material with a wide range of uses. Its downstream products include adiponitrile, methionine, sodium cyanide, pesticides, herbicides, etc., and the industry has a large demand for it.

[0003] In the synthesis method of hydrocyanic acid, taking the Anscher process as an example, the synthesis gas of hydrocyanic acid includes unreacted ammonia and product hydrocyanic acid that needs to be absorbed. The presence of ammonia will cause the polymerization of hydrocyanic acid to produce black polymers. In severe cases, it may even cause blockage of equipment pipelines or even explosions. Therefore, before absorbing hydrocyanic acid into liquid phase, an efficient and safe ammonia removal process is required to remove ammonia in hydrocyanic acid.

[0004] At present, the more common ammonia removal process is to pass the hydrocyanic acid synthesis gas into the bottom of the ammonia removal tower, and at the same time, pass acid (such as sulfuric acid) into the top of the ammonia removal tower, and absorb the ammonia in the hydrocyanic acid synthesis gas through the acid. In this process, the hydrocyanic acid synthesis gas flows from bottom to top in the ammonia removal tower, and the acid flows from top to bottom in the ammonia removal tower. The acid and the hydrocyanic acid synthesis gas contact each other and absorb the ammonia in the hydrocyanic acid synthesis gas. The hydrocyanic acid synthesis gas after being absorbed by the acid is discharged from the top of the ammonia removal tower, and the hydrocyanic acid product can be obtained after distillation, and the acid that absorbs ammonia is discharged from the bottom of the ammonia removal tower.

[0005] In the ammonia removal tower, due to the flow of hydrocyanic acid synthesis gas and acid liquid, a large amount of foam is attached to the packing frame in the ammonia removal tower, and the foam attached to the surface of the packing frame will affect the normal conduction of the pores of the packing frame, that is, affect the normal interaction between the acid liquid and the hydrocyanic acid synthesis gas, thereby affecting the absorption of ammonia in the hydrocyanic acid synthesis gas by the acid liquid. Although some ammonia removal towers are equipped with demisters, the main function of the demisters in the existing ammonia removal towers is to reduce the foam content of the hydrocyanic acid synthesis gas flowing out of the top of the ammonia removal tower, and effectively treat the foam on the packing frame. Therefore, in view of this, the inventor provides an ammonia removal device and process for hydrocyanic acid production to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that the packing rack in the traditional ammonia removal tower is easy to accumulate foam, which affects the normal interaction between the acid solution and the hydrocyanic acid synthesis gas, resulting in a reduced absorption effect of the acid solution on the ammonia gas.

[0007] In order to achieve the above object, the basic scheme of the present invention provides an ammonia removal device for hydrocyanic acid production, comprising:

[0008] A tower body, wherein the bottom of the side wall of the tower body is connected to a hydrocyanic acid synthesis gas feed pipe, the top of the side wall of the tower body is connected to an acid liquid feed pipe, the top of the tower body is connected to a hydrocyanic acid synthesis gas discharge pipe, and the bottom of the tower body is connected to an acid liquid discharge pipe;

[0009] A packing rack, wherein the packing rack is in multiple numbers and is evenly arranged vertically in the tower body;

[0010] The demister comprises a rotating shaft vertically rotatably connected to the tower body, a scraper arranged on the rotating shaft and capable of scraping along the wall surface of the filling frame, and a driving mechanism for driving the rotating shaft to rotate.

[0011] The principles and effects of this basic solution are:

[0012] Compared with the prior art, the present invention provides a rotating shaft, a scraper and a driving mechanism, so that the driving mechanism drives the rotating shaft to rotate, and then the scraper on the rotating shaft scrapes along the wall of the packing frame, thereby preventing foam from accumulating on the packing frame, so as to avoid the foam from affecting the normal conduction of the gap of the packing frame, thereby improving the interaction effect between the acid solution and the hydrocyanic acid synthesis gas, and thereby improving the absorption effect of the acid solution on the ammonia gas.

[0013] Furthermore, the driving mechanism comprises:

[0014] An adjusting rod, wherein the adjusting rod is slidably connected to the side wall of the tower body, one end of the adjusting rod extends into the box body and is provided with an adjusting rack;

[0015] An adjusting gear, the adjusting gear is coaxially connected to the rotating shaft and meshes with the adjusting rack;

[0016] A power unit, the power unit drives the adjusting rod to slide back and forth;

[0017] The tower body is provided with a protective box covering the adjusting rack and the adjusting gear, and a plurality of fixing rods are provided between the protective box and the inner wall of the tower body. The adjusting rod is driven to slide back and forth by a power unit, so that the adjusting rod drives the adjusting rack to slide back and forth, and then the adjusting gear reciprocates to drive the rotating shaft to rotate back and forth, so that the scraper scrapes along the wall of the filling frame. In this process, the protective box protects the adjusting rack and the adjusting gear.

[0018] Furthermore, the level of the connection between the hydrocyanic acid synthesis gas feed pipe and the tower body is lower than the level of the protection box, and the bottom of the rotating shaft extends out of the protection box and is provided with a plurality of blades. By providing the blades, when the rotating shaft rotates, it can drive the hydrocyanic acid synthesis gas introduced into the tower body through the hydrocyanic acid synthesis gas feed pipe to move, so that the hydrocyanic acid synthesis gas is more evenly distributed at the bottom of the tower body, further improving the interaction effect between the acid solution and the hydrocyanic acid synthesis gas, that is, improving the absorption effect of the acid solution on ammonia.

[0019] Further, the demister also includes:

[0020] A support plate, wherein a mounting groove adapted to the top of the rotating shaft is provided on the support plate;

[0021] Connecting rods, which are multiple and respectively arranged between the supporting plate and the inner wall of the tower body. The supporting plate and the connecting rods play a supporting and limiting role on the rotating shaft, which is convenient for the installation and rotation of the rotating shaft.

[0022] Furthermore, a limiting guide rail is provided in the protection box, and the adjusting rack is slidably connected to the limiting guide rail, and the limiting guide rail plays a role of limiting and guiding the sliding of the adjusting rack.

[0023] Furthermore, the power unit comprises:

[0024] A heat-conducting pipe, the heat-conducting pipe is connected to the hydrocyanic acid synthesis gas feed pipe;

[0025] A heat exchange pipe, wherein the heat exchange pipe is wound around the heat conducting pipe;

[0026] A pressure chamber, the pressure chamber is communicated with the heat exchange pipe, and a pressure relief port is provided on one side of the pressure chamber;

[0027] A piston, the piston is slidably and sealingly connected in the pressure chamber, one end of the regulating rod extends into the pressure chamber and is connected to the piston;

[0028] a first restoring member, the first restoring member being arranged between the piston and a side wall of the pressure chamber;

[0029] A water inlet pipe is connected to the heat exchange pipe.

[0030] Since the hydrocyanic acid synthesis gas introduced into the hydrocyanic acid synthesis gas feed pipe has a pressure slightly lower than the standard atmospheric pressure and a temperature of about 150-250°C, that is, the hydrocyanic acid synthesis gas in the hydrocyanic acid synthesis gas feed pipe has a relatively high heat, the heat of the hydrocyanic acid synthesis gas is transferred to the heat exchange pipe through the heat conduction pipe, thereby heating the medium in the heat exchange pipe, causing the pressure in the pressure chamber to gradually increase, driving the piston and the adjusting rod to move, and when the piston moves to the pressure relief port and is connected to the pressure chamber, the pressure in the pressure chamber leaks out, and the first reset member resets the piston and the adjusting rod, thereby achieving the effect of utilizing the heat energy of the hydrocyanic acid synthesis gas to drive the rotating shaft to rotate reciprocatingly, and in this process, the hydrocyanic acid synthesis gas can also be cooled to reduce the polymerization reaction of the hydrocyanic acid synthesis gas in the tower body.

[0031] Furthermore, the water inlet pipe includes a first pipe, a second pipe and a control valve disposed between the first pipe and the second pipe, wherein a flow guiding cavity is disposed in the control valve, the adjusting shaft is slidably and sealingly connected to the flow guiding cavity, and a through hole for connecting the first pipe with the second pipe is disposed on the adjusting shaft. By disposing the control valve, it is convenient to adjust the connection and disconnection between the first pipe and the second pipe, thereby facilitating the adjustment of water supply and disconnection to the heat exchange pipe.

[0032] Furthermore, one end of the regulating shaft passes through the control valve and is provided with a bump, and a second reset member is provided between the bump and the control valve. The bump can prevent the regulating shaft from being separated from the control valve, and the second reset member is used to assist the first reset member to further improve the reset performance of the piston.

[0033] Based on the same inventive concept, the present invention provides an ammonia removal process for hydrocyanic acid production, comprising using the above-mentioned ammonia removal device to remove ammonia from hydrocyanic acid synthesis gas.

[0034] Further, the steps of removing ammonia from hydrocyanic acid synthesis gas using the above-mentioned ammonia removal device are as follows:

[0035] Step S001, passing hydrocyanic acid synthesis gas into the tower body from the hydrocyanic acid synthesis gas feed pipe, and passing acid liquid into the tower body from the acid liquid feed pipe;

[0036] Step S002, the hydrocyanic acid synthesis gas flows from bottom to top in the tower body, and the acid liquid flows from top to bottom in the tower body, the acid liquid and the hydrocyanic acid synthesis gas contact each other and absorb ammonia in the hydrocyanic acid synthesis gas, the hydrocyanic acid synthesis gas absorbed by the acid liquid is discharged from the hydrocyanic acid synthesis gas discharge pipe, and the acid liquid that absorbs ammonia is discharged from the acid liquid discharge pipe. In this process, the driving mechanism drives the rotating shaft to rotate, so that the scraper on the rotating shaft scrapes along the wall of the filling frame to remove the foam attached to the filling frame.

[0037] Compared with the prior art, the present method utilizes a rotating shaft, a scraper and a driving mechanism, so that the driving mechanism drives the rotating shaft to rotate, and then the scraper on the rotating shaft scrapes along the wall of the packing frame, thereby preventing foam from accumulating on the packing frame, thereby avoiding the foam from affecting the normal conduction of the gap of the packing frame, thereby improving the interaction effect between the acid solution and the hydrocyanic acid synthesis gas, and thereby improving the absorption effect of the acid solution on ammonia. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of an ammonia removal device for hydrocyanic acid production proposed in an embodiment of the present application is shown;

[0040] Figure 2 A schematic diagram of a power unit in an ammonia removal device for producing hydrocyanic acid proposed in an embodiment of the present application is shown;

[0041] Figure 3 A cross-sectional view of a power unit in an ammonia removal device for producing hydrocyanic acid proposed in an embodiment of the present application is shown;

[0042] Figure 4 A schematic diagram of the interior of a protective box in an ammonia removal device for hydrocyanic acid production proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0044] The figure marks in the drawings of the specification include: tower body 1, hydrocyanic acid synthesis gas feed pipe 2, acid liquid feed pipe 3, hydrocyanic acid synthesis gas discharge pipe 4, acid liquid discharge pipe 5, spray head 6, filler frame 7, rotating shaft 8, scraper 9, pressure box 10, protection box 11, blade 12, adjusting rod 13, first pipeline 14, second pipeline 15, control valve 16, bump 17, second reset member 18, through hole 18, pressure relief port 20, heat exchange pipeline 21, piston 22, first reset member 23, baffle 24, heat conduction pipeline 25, adjusting rack 26, adjusting gear 27, limiting guide rail 28, support plate 29, connecting rod 30.

[0045] A device for removing ammonia from hydrocyanic acid production, for example Figure 1 As shown, it includes the following parts:

[0046] Tower body 1: The bottom of the side wall of the tower body 1 is connected to a hydrocyanic acid synthesis gas feed pipe 2, the top of the side wall of the tower body 1 is connected to an acid liquid feed pipe 3, the top of the tower body 1 is connected to a hydrocyanic acid synthesis gas discharge pipe 4, and the bottom of the tower body 1 is connected to an acid liquid discharge pipe 5; an acid liquid feed pipe 3 is provided with an acid liquid pump, the acid liquid feed pipe 3 extends into the tower body 1 and is provided with a spray head 6.

[0047] Packing rack 7: There are two packing racks 7 which are vertically arranged in the tower body 1. The packing racks 7 and the inner wall of the tower body 1 are fixed to each other. A plurality of gaps are staggeredly arranged on the packing racks 7 to allow the flow of hydrocyanic acid synthesis gas and acid liquid.

[0048] Defoamer: The defoamer includes a rotating shaft 8 vertically connected to the tower body 1, a scraper 9 arranged on the rotating shaft 8 and capable of scraping along the wall surface of the filling frame 7, and a driving mechanism for driving the rotating shaft 8 to rotate.

[0049] Specifically, the rotating shaft 8 is installed through a support plate 29 and a connecting rod 30. The support plate 29 is provided with a mounting groove adapted to the top of the rotating shaft 8, and there are several connecting rods 30, which are respectively arranged between the support plate 29 and the bottom of the inner wall of the tower body 1. The acid liquid discharge pipe 5 is connected to the bottom of the tower body 1 at a position between each connecting rod 30; there are several scrapers 9 distributed on the side wall of the rotating shaft 8, and a plurality of through grooves are evenly arranged in the filling frame 7. The through grooves do not penetrate the outer wall of the filling frame 7. The outer wall of the filling frame 7 needs to be used as a whole to connect the filling frame 7, and each scraper 9 scrapes along each through groove and the upper and lower walls of the filling frame 7.

[0050] The driving mechanism in the demister includes an adjusting rod 13, an adjusting gear 27 and a power unit. Figure 4 As shown, the adjusting rod 13 is slidably connected to the side wall of the tower body 1, one end of the adjusting rod 13 extends into the box body and is provided with an adjusting rack 26; the adjusting gear 27 is coaxially connected to the rotating shaft 8 and meshes with the adjusting rack 26; a protective box 11 covering the adjusting rack 26 and the adjusting gear 27 is provided in the tower body 1, a limiting guide rail 28 is provided in the protective box 11, the adjusting rack 26 is slidably connected to the limiting guide rail 28, a plurality of fixing rods are provided between the protective box 11 and the inner wall of the tower body 1, thereby fixing the protective box 11 and the tower body 1 to each other; the power unit is used to drive the adjusting rod 13 to slide back and forth.

[0051] like Figure 2 and Figure 3As shown, the power unit in the driving mechanism includes: a heat conducting pipe 25, a heat exchange pipe 21, a pressure box 10 body, a piston 22, a first reset member 23 and a water inlet pipe, etc. The heat conducting pipe 25 is connected to the hydrocyanic acid synthesis gas feed pipe 2; and the heat exchange pipe 21 is wound around the heat conducting pipe 25; a pressure chamber is provided in the pressure box 10 body, and the piston 22 is slidably and sealedly connected in the pressure chamber. The piston 22 divides the pressure chamber into a first chamber and a second chamber. The second chamber is connected to the end of the heat exchange pipe 21. A plurality of air guide holes are provided in the first chamber. A pressure relief port 20 connected to the pressure chamber is provided on the top of the pressure box 10 body. It is worth noting that the size of the first chamber and the second chamber will change with the movement of the piston 22, so that the pressure relief port 20 can be connected to the first chamber or the second chamber; the adjusting rod 13 passes through the pressure box 10 body and moves synchronously with the piston 22, and the first reset member 23 adopts a spring and is sleeved on the adjusting rod 13 and is located at the piston 22 and the first chamber; a baffle 24 that can block the pressure relief port 20 is also provided on the piston 22 to prevent the pressure relief port 20 from being connected to the first chamber and the second chamber at the same time, causing high-temperature steam to enter the first chamber and affect the service life of the first reset member 23; the water inlet pipe includes a first pipe 14, a second pipe 15 and a control valve 16 arranged between the first pipe 14 and the second pipe 15, the first pipe 14 is connected to a water tank, the height of the water tank is higher than the control valve 16, so that water can flow into the control valve 16 under the action of gravity, the second pipe 15 extends into the pressure box 10 and is connected to the heat exchange pipe 21, a guide cavity is provided in the control valve 16, the adjusting shaft is slidably and sealedly connected to the guide cavity and a through hole 18 that can connect the first pipe 14 with the second pipe 15 is provided on the adjusting shaft, the left end of the adjusting shaft passes through the control valve 16 and is provided with a protrusion 17, and a second reset member 18 is provided between the protrusion 17 and the control valve 16.

[0052] In this embodiment, the level of the connection between the hydrocyanic acid synthesis gas feed pipe 2 and the tower body 1 is lower than the level of the protection box 11, and the lower end of the rotating shaft 8 extends out of the protection box 11 and is provided with a plurality of blades 12. When the rotating shaft 8 rotates, the hydrocyanic acid synthesis gas introduced into the tower body 1 by the hydrocyanic acid synthesis gas feed pipe 2 can be driven to move, so that the hydrocyanic acid synthesis gas is more evenly distributed at the bottom of the tower body 1, further improving the interaction effect between the acid solution and the hydrocyanic acid synthesis gas, that is, improving the absorption effect of the acid solution on ammonia.

[0053] When the adjusting rod 13 is located at the rightmost end, the through hole 18 does not connect the first pipe 14 and the second pipe 15, resulting in that the water in the heat exchange pipe 21 can only flow to the second chamber after being heated, resulting in an increase in the air pressure in the second chamber, thereby causing the piston 22 to move left and drive the adjusting rod 13 to move left, the first reset member 23 is compressed and the second reset member 18 is stretched until the piston 22 reaches the pressure relief port 20, so that the pressure relief port 20 is connected to the second chamber. At this time, the through hole 18 is also located in the control valve 16 and connects the first pipe 14 and the second pipe 15, and the high-pressure gas in the second chamber is discharged from the pressure relief port 20, and the water flow in the first pipe 14 enters the second pipe 15 and the heat exchange pipe 21 under the action of gravity and water pressure, so that the air pressure in the second chamber is reduced, and at the same time, the elastic potential energy of the first reset member 23 and the second reset member 18 drives the piston 22 and the adjusting rod 13 to reset.

[0054] During the implementation of this embodiment, hydrocyanic acid synthesis gas with a pressure of 0.01-0.1 MPaG and a temperature of 150-250° C. from a reactor is introduced into the tower body 1 from a hydrocyanic acid synthesis gas feed pipe 2, and an acid solution (sulfuric acid) is introduced into the tower body 1 from an acid solution feed pipe 3 under the action of an acid solution pump, and is sprinkled out from a spray head 6; the hydrocyanic acid synthesis gas flows from bottom to top in the tower body 1, and the acid solution flows from top to bottom in the tower body 1, the acid solution and the hydrocyanic acid synthesis gas contact each other and absorb ammonia in the hydrocyanic acid synthesis gas, and the hydrocyanic acid synthesis gas absorbed by the acid solution is discharged from the hydrocyanic acid synthesis gas outlet. The material pipe 4, the acid liquid that has absorbed ammonia is discharged from the acid liquid discharge pipe 5. During this process, the hydrocyanic acid synthesis gas flows through the heat conduction pipe 25 and exchanges heat with the water in the heat exchange pipe 21, so that the piston 22 drives the adjusting rod 13 to reciprocate, thereby driving the rotating shaft 8 to reciprocate, that is, the scraper 9 on the rotating shaft 8 is scraped along the wall surface of the packing frame 7 and the through groove of the packing frame 7 to prevent the accumulation of foam on the packing frame 7 and prevent the foam from affecting the normal conduction of the gap of the packing frame 7, thereby improving the interaction effect between the acid liquid and the hydrocyanic acid synthesis gas, and thereby improving the absorption effect of the acid liquid on ammonia.

[0055] Based on the same inventive concept, the present invention provides an ammonia removal process for hydrocyanic acid production, comprising using the above-mentioned ammonia removal device to remove ammonia from hydrocyanic acid synthesis gas, the steps are as follows:

[0056] Step S001, the hydrocyanic acid synthesis gas with a pressure of 0.01-0.1 MPaG and a temperature of 150-250° C. from the reactor is introduced into the tower body 1 from the hydrocyanic acid synthesis gas feed pipe 2, and the acid liquid (sulfuric acid) is introduced into the tower body 1 from the acid liquid feed pipe 3 under the action of the acid liquid pump and is sprayed out from the spray head 6;

[0057] In step S002, the hydrocyanic acid synthesis gas flows from bottom to top in the tower body 1, and the acid liquid flows from top to bottom in the tower body 1. The acid liquid contacts the hydrocyanic acid synthesis gas and absorbs ammonia in the hydrocyanic acid synthesis gas. The hydrocyanic acid synthesis gas absorbed by the acid liquid is discharged from the hydrocyanic acid synthesis gas discharge pipe 4, and the acid liquid that absorbs ammonia is discharged from the acid liquid discharge pipe 5. In this process, the hydrocyanic acid synthesis gas flows through the heat conduction pipe 25 and exchanges heat with the water in the heat exchange pipe 21, so that the piston 22 drives the adjusting rod 13 to reciprocate, so as to drive the rotating shaft 8 to rotate reciprocatingly, that is, the scraper 9 on the rotating shaft 8 is scraped along the wall of the filling frame 7 and the through groove of the filling frame 7 to prevent the accumulation of foam on the filling frame 7 and prevent the foam from affecting the normal conduction of the gap of the filling frame 7, thereby improving the interaction effect between the acid liquid and the hydrocyanic acid synthesis gas, and thereby improving the absorption effect of the acid liquid on ammonia.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An ammonia removal device for the production of hydrocyanic acid, characterized in that: include: A tower body, wherein the bottom of the side wall of the tower body is connected to a hydrocyanic acid synthesis gas feed pipe, the top of the side wall of the tower body is connected to an acid liquid feed pipe, the top of the tower body is connected to a hydrocyanic acid synthesis gas discharge pipe, and the bottom of the tower body is connected to an acid liquid discharge pipe; A packing rack, wherein the packing rack is in multiple numbers and is evenly arranged vertically in the tower body; The demister comprises a rotating shaft vertically rotatably connected to the tower body, a scraper disposed on the rotating shaft and capable of scraping along the wall surface of the packing frame, and a driving mechanism for driving the rotating shaft to rotate, the driving mechanism comprising: An adjusting rod, wherein the adjusting rod is slidably connected to the side wall of the tower body, one end of the adjusting rod extends into the box body and is provided with an adjusting rack; An adjusting gear, the adjusting gear is coaxially connected to the rotating shaft and meshes with the adjusting rack; A power unit, the power unit drives the adjusting rod to slide back and forth, the power unit comprising: A heat-conducting pipe, the heat-conducting pipe is connected to the hydrocyanic acid synthesis gas feed pipe; A heat exchange pipe, wherein the heat exchange pipe is wound around the heat conducting pipe; A pressure chamber, the pressure chamber is communicated with the heat exchange pipe, and a pressure relief port is provided on one side of the pressure chamber; A piston, the piston is slidably and sealingly connected in the pressure chamber, one end of the regulating rod extends into the pressure chamber and is connected to the piston; a first restoring member, the first restoring member being arranged between the piston and a side wall of the pressure chamber; a water inlet pipe, the water inlet pipe being in communication with the heat exchange pipe; A protection box covering the adjusting rack and the adjusting gear is arranged in the tower body, and a plurality of fixing rods are arranged between the protection box and the inner wall of the tower body.

2. The ammonia removal device for hydrocyanic acid production according to claim 1, characterized in that: The level of the connection point between the hydrocyanic acid synthesis gas feed pipe and the tower body is lower than the level of the protection box, and the bottom of the rotating shaft extends out of the protection box and is provided with a plurality of blades.

3. The ammonia removal device for hydrocyanic acid production according to claim 2, characterized in that: The demister also includes: A support plate, wherein a mounting groove adapted to the top of the rotating shaft is provided on the support plate; Connecting rods, which are multiple and respectively arranged between the supporting plate and the inner wall of the tower body.

4. The ammonia removal device for hydrocyanic acid production according to claim 3, characterized in that: A limiting guide rail is arranged in the protection box, and the adjusting rack is slidably connected to the limiting guide rail.

5. An ammonia removal device for hydrocyanic acid production according to any one of claims 1 to 4, characterized in that: The water inlet pipe includes a first pipeline, a second pipeline and a control valve arranged between the first pipeline and the second pipeline. A guide cavity is arranged in the control valve. The adjustment rod is slidingly and sealingly connected to the guide cavity. The adjustment rod is provided with a through hole that can connect the first pipeline with the second pipeline.

6. The ammonia removal device for hydrocyanic acid production according to claim 5, characterized in that: One end of the regulating rod passes through the control valve and is provided with a convex block, and a second reset member is provided between the convex block and the control valve.

7. A process for removing ammonia for producing hydrocyanic acid, characterized in that: The method comprises using the ammonia removal device described in any one of claims 1 to 6 to remove ammonia from hydrocyanic acid synthesis gas.

8. The ammonia removal process for producing hydrocyanic acid according to claim 7, characterized in that: The steps of removing ammonia from hydrocyanic acid synthesis gas using the ammonia removal device described in any one of claims 1 to 6 are as follows: Step S001, passing hydrocyanic acid synthesis gas into the tower body from the hydrocyanic acid synthesis gas feed pipe, and passing acid liquid into the tower body from the acid liquid feed pipe; Step S002, the hydrocyanic acid synthesis gas flows from bottom to top in the tower body, and the acid liquid flows from top to bottom in the tower body, the acid liquid and the hydrocyanic acid synthesis gas contact each other and absorb ammonia in the hydrocyanic acid synthesis gas, the hydrocyanic acid synthesis gas absorbed by the acid liquid is discharged from the hydrocyanic acid synthesis gas discharge pipe, and the acid liquid that absorbs ammonia is discharged from the acid liquid discharge pipe. In this process, the driving mechanism drives the rotating shaft to rotate, so that the scraper on the rotating shaft scrapes along the wall of the filling frame to remove the foam attached to the filling frame.

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