High concentration ammonia absorbing adsorption tower

Abstract

The application relates to the technical field of ammonia fluoride production, in particular to a high-concentration ammonia gas absorption tower; the high-concentration ammonia gas absorption tower comprises an absorption tower body, wherein the upper end of the absorption tower body is provided with a sealing cover, the upper end of the sealing cover is provided with a head, the second exhaust pipe, the first exhaust pipe and the gas inlet pipe are simultaneously connected to the head, the lower end of the absorption tower body is sleeved in a refrigeration box, and the high-concentration ammonia gas absorption tower can realize ammonia recovery operation on tail gas in the presence or absence of absorption liquid; in the presence of absorption liquid, the entering tail gas is discharged from the absorption liquid, so that the tail gas can directly and fully contact with the absorption liquid, and the absorption degree of the absorption liquid to the tail gas ammonia is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of ammonia fluoride production technology, specifically a high-concentration ammonia absorption adsorption tower. Background Technology

[0002] Ammonium fluoride has a wide range of uses, such as as a glass etching agent, a chemical polishing agent for metal surfaces, a preservative for wood and winemaking, a disinfectant, a mordant for fibers, and a solvent for extracting rare elements. It can also be used as a masking agent for ion detection in chemical analysis, a disinfectant and preservative for winemaking, and a mordant for fibers.

[0003] The current method for producing ammonium fluoride is the liquid-phase method: a measured amount of hydrofluoric acid is added to a lead or plastic container, the container is cooled with water outside, and ammonia gas is slowly introduced while stirring until the pH value of the reaction solution reaches about 4; the reaction solution is cooled and crystallized, centrifuged, and dried by airflow to obtain the ammonium fluoride product; the tail gas generated during the production of ammonium fluoride contains ammonia gas. If the ammonia gas is directly emitted, it will not only pollute the air environment, but also waste resources. Therefore, it is necessary to recover and reuse the ammonia gas in the tail gas.

[0004] Currently, ammonia recovery from exhaust gas is generally carried out using an ammonia adsorption tower. The ammonia adsorption tower is equipped with a turbulence generator. The exhaust gas is introduced from the lower side of the ammonia adsorption tower, while the absorbent liquid is introduced from the upper side of the ammonia adsorption tower. After being diffused by a distributor, the absorbent liquid enters the turbulence generator. As the absorbent liquid flows inside the turbulence generator, it fully contacts and mixes with the ammonia contained in the rising exhaust gas, thereby realizing the recovery and utilization of ammonia in the exhaust gas.

[0005] This type of ammonia adsorption tower has the following defects. For example, the absorbent and the tail gas are absorbed in contact in the turbulent chamber. The pipe diameter at the location where the turbulent chamber is installed in the ammonia adsorption tower is generally large, so the turbulent chamber is generally large. This results in a long gap between adjacent blades inside the turbulent chamber. If the absorbent is not sufficiently distributed, it is easy for the absorbent to escape in the gap between adjacent blades and not come into contact with the ammonia in the tail gas, which will eventually cause the ammonia in the tail gas to diffuse out, resulting in a waste of tail gas resources.

[0006] In view of the problems mentioned above in the background art, the present invention aims to provide a high-concentration ammonia absorption adsorption tower. Summary of the Invention

[0007] The purpose of this invention is to provide a high-concentration ammonia absorption adsorption tower to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A high-concentration ammonia absorption adsorption tower, the high-concentration ammonia absorption adsorption tower comprising:

[0010] The adsorption tower body has a sealing cover at its upper end, and an end cap is installed at the upper end of the sealing cover. A second exhaust pipe, a first exhaust pipe, and an inlet pipe are connected to the end cap simultaneously. The inlet pipe and the first exhaust pipe are located at the upper and lower ends of the same side of the end cap, and the second exhaust pipe is located on the side opposite to the end cap connected to the first exhaust pipe, forming a horizontal line. Electric valves are installed on the inlet pipe, the first exhaust pipe, and the second exhaust pipe connected to the end cap.

[0011] The lower end of the adsorption tower body is fitted inside the refrigeration box.

[0012] As a further aspect of the present invention: a condenser tube is installed at the center of the adsorption tower body, the upper end of the condenser tube is connected to both the inlet pipe and the first exhaust pipe; the bottom end of the condenser tube is connected to a distribution pipe; the distribution pipe and the condenser tube work together to form an inverted T-shape.

[0013] As a further aspect of the present invention: a groove is provided in the middle of the shunt pipe at the bottom end where the condenser pipe is connected.

[0014] As a further embodiment of the present invention: a water inlet pipe is connected to the upper end of one side of the refrigeration box, and a drain pipe is connected to the lower end of the other side of the refrigeration box.

[0015] As a further embodiment of the present invention: a drain pipe is connected to one side of the lower end of the adsorption tower body, and the end of the drain pipe after passing through the inner wall of the adsorption tower body and the inner wall of the refrigeration box is fixed by a shaft seal. At the same time, a valve is also installed on the drain pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] Compared with existing ammonia adsorption towers, the high-concentration ammonia adsorption tower described above has the following advantages:

[0018] First, it changes the original method of directly introducing tail gas ammonia from the lower end of the adsorption tower and installing a turbulence generator and diffusion absorbent at the upper end of the adsorption tower. Instead, it is designed as a placement and filling adsorption tower structure. The second exhaust pipe, the first exhaust pipe and the inlet pipe are connected to the upper end of the adsorption tower at the same time. At the same time, the lower end of the adsorption tower body is fitted inside the refrigeration box.

[0019] When the adsorption tower body is filled with absorbent liquid, the second exhaust pipe and the inlet pipe are opened simultaneously, while the first exhaust pipe is closed. The waste ammonia gas enters through the inlet pipe and is then transported along the condenser pipe connected to the inlet pipe to the position of the diversion pipe. It then exits from both sides of the diversion pipe and enters the bottom of the adsorption tower body. The ammonia gas then enters the absorbent liquid filling the adsorption tower body and escapes and is discharged. Finally, the waste gas is absorbed by the absorbent liquid and escapes and is discharged through the second exhaust pipe.

[0020] When no absorbent liquid is injected into the adsorption tower body, the inlet pipe and the first exhaust pipe are opened simultaneously, while the second exhaust pipe is closed. In addition, circulating cold water is introduced into the refrigeration box to create a cooling state inside the adsorption tower body. The tail gas ammonia is introduced through the inlet pipe and then flows from top to bottom inside the adsorption tower body. During the downward flow of the tail gas, the cooling state inside the adsorption tower body can accelerate the condensation of the tail gas ammonia into droplets. At the same time, the tail gas ammonia finally enters from both sides of the branch pipe connected to the bottom of the condenser pipe, and then rises along the condenser pipe. During the rising process, it can condense into droplets again.

[0021] This allows the entire high-concentration ammonia absorption tower to recover ammonia from the tail gas regardless of the presence or absence of absorbent liquid. At the same time, when absorbent liquid is present, the incoming tail gas, having escaped from the absorbent liquid, can directly and fully contact the absorbent liquid, greatly improving the absorption rate of ammonia in the tail gas. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0023] Figure 1 This is a schematic diagram of a high-concentration ammonia absorption adsorption tower according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram illustrating the principle of adsorption using an adsorption liquid in a high-concentration ammonia absorption adsorption tower according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram illustrating the principle of direct liquefaction deposition in a high-concentration ammonia absorption adsorption tower according to an embodiment of the present invention.

[0026] In the diagram: 1-End, 2-Inlet pipe, 3-First exhaust pipe, 4-Second exhaust pipe, 5-Electric valve, 6-Sealing cover, 7-Adsorption tower body, 8-Refrigeration box, 9-Drain pipe, 10-Drain pipe, 11-Water inlet pipe, 12-Condensing pipe, 13-Diverter pipe, 14-Groove. Detailed Implementation

[0027] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0028] Example

[0029] Please see Figure 1 , Figure 2 and Figure 3 The present invention provides a high-concentration ammonia absorption adsorption tower, the high-concentration ammonia absorption adsorption tower comprising:

[0030] The adsorption tower body 7 is used to absorb the ammonia tail gas generated during the production of ammonia fluoride; wherein, the upper end of the adsorption tower body 7 is provided with a sealing cover 6, and an end cap 1 is installed on the upper end of the sealing cover 6.

[0031] A second exhaust pipe 4, a first exhaust pipe 3, and an inlet pipe 2 are simultaneously connected to end 1. The inlet pipe 2 and the first exhaust pipe 3 are located at the upper and lower ends of the same side of end 1, while the second exhaust pipe 4 is located on the opposite side of end 1, which is horizontally aligned with the first exhaust pipe 3. Electric valves 5 are installed on the inlet pipe 2, the first exhaust pipe 3, and the second exhaust pipe 4 connected to end 1. By changing the different states of the second exhaust pipe 4, the inlet pipe 2, and the first exhaust pipe 3 connected to end 1, efficient recovery of ammonia gas entering the adsorption tower body 7 can be achieved.

[0032] The lower end of the adsorption tower body 7 is fitted inside the refrigeration box 8; the refrigeration box 8 is used to circulate cooling water, thereby cooling the inside of the adsorption tower body 7, so that the ammonia gas entering the adsorption tower body 7 is liquefied into droplets after being cooled, making it easy to collect.

[0033] In an embodiment of the present invention, when the high-concentration ammonia absorption adsorption tower is used, the adsorption tower body 7 is first cooled by circulating cold water into the refrigeration box 8.

[0034] Next, depending on the actual situation, such as whether the adsorption tower body 7 is filled with absorbent liquid, the different states of the second exhaust pipe 4, the inlet pipe 2 and the first exhaust pipe 3 connected to the end 1 are adjusted and controlled respectively to control the flow state of ammonia in the adsorption tower body 7, thereby maximizing the recovery of ammonia entering the adsorption tower body 7.

[0035] Please see Figure 2 and Figure 3 In one embodiment of the present invention, a condenser tube 12 is installed at the center of the adsorption tower body 7. The upper end of the condenser tube 12 is connected to the air inlet pipe 2 and the first exhaust pipe 3 at the same time. The bottom end of the condenser tube 12 is connected to the diversion pipe 13. The diversion pipe 13 and the condenser tube 12 work together to form an inverted T-shape.

[0036] For example, when the adsorption tower body 7 is filled with absorbent liquid, the second exhaust pipe 4 and the inlet pipe 2 are opened simultaneously, and the first exhaust pipe 3 is closed. The waste gas ammonia enters from the inlet pipe 2, and then is transported to the position of the diversion pipe 13 along the condenser pipe 12 connected to the inlet pipe 2. It is discharged from both sides of the diversion pipe 13 into the bottom of the adsorption tower body 7. Then the ammonia enters the absorbent liquid filled inside the adsorption tower body 7 and escapes and is discharged. Finally, the waste gas is absorbed by the absorbent liquid and escapes and is discharged from the position of the second exhaust pipe 4.

[0037] When no absorbent liquid is injected into the adsorption tower body 7, the inlet pipe 2 and the first exhaust pipe 3 are opened simultaneously, while the second exhaust pipe 4 is closed. In addition, circulating cold water is introduced into the refrigeration box 8 to create a cooling state inside the adsorption tower body 7. The tail gas ammonia is introduced through the inlet pipe 2 and then flows from top to bottom inside the adsorption tower body 7. During the downward flow of the tail gas, the cooling state inside the adsorption tower body 7 can accelerate the condensation of the tail gas ammonia into droplets. At the same time, the tail gas ammonia finally enters from both sides of the diversion pipe 13 connected to the bottom of the condenser pipe 12, and then rises along the condenser pipe 12. During the rising process, it can be condensed into droplets again. (The ammonia that has been condensed first accumulates to a certain volume inside the adsorption tower body 7, and then the flowing ammonia escapes and is discharged along the accumulated ammonia liquid).

[0038] In an embodiment of the present invention, a groove 14 is provided in the middle of the diversion pipe 13 at the bottom end where the condenser pipe 12 is connected; the groove 14 is used to buffer and dampen the ammonia gas introduced from top to bottom through the condenser pipe 12, so as to prevent the flowing ammonia gas from directly impacting the inner wall of the diversion pipe 13 and then spreading inside the diversion pipe 13; instead, the flowing ammonia gas is buffered before spreading.

[0039] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the upper end of one side of the refrigeration box 8 is connected to a water inlet pipe 11, and the lower end of the other side of the refrigeration box 8 is connected to a drain pipe 9; the connected water inlet pipe 11 is used to introduce cooling water into the refrigeration box 8, while the connected drain pipe 9 is used to discharge the hot water after heat exchange with the adsorption tower body 7; through the cooperation of the connected water inlet pipe 11 and drain pipe 9, circulating cooling water can be introduced into the refrigeration box 8 to continuously perform heat exchange and cooling operations on the adsorption tower body 7.

[0040] Please see Figure 1 and Figure 2 In one embodiment of the present invention, a drain pipe 10 is connected to one side of the lower end of the adsorption tower body 7. The end portion of the drain pipe 10 after passing through the inner wall of the adsorption tower body 7 and the inner wall of the refrigeration box 8 is fixed by a shaft seal. At the same time, a valve is also installed on the drain pipe 10.

[0041] After a certain volume of ammonia solution has been collected inside the adsorption tower body 7, the valve installed on the drain pipe 10 can be opened to discharge the ammonia solution temporarily stored inside the adsorption tower body 7.

[0042] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-concentration ammonia absorption adsorption tower, comprising: An adsorption tower body (7), wherein a sealing cap (6) is provided at the upper end of the adsorption tower body (7), and an end cap (1) is installed at the upper end of the sealing cap (6); characterized in that: The second exhaust pipe (4), the first exhaust pipe (3), and the intake pipe (2) are connected to the end (1) at the same time. The intake pipe (2) and the first exhaust pipe (3) are located at the upper and lower ends of the same side of the end (1), and the second exhaust pipe (4) is located on the side opposite to the end (1) connected to the first exhaust pipe (3) and in a horizontal line. Electric valves (5) are installed on the intake pipe (2), the first exhaust pipe (3), and the second exhaust pipe (4) connected to the end (1). The lower end of the adsorption tower body (7) is fitted inside the refrigeration box (8); A condenser tube (12) is installed at the center of the adsorption tower body (7). The upper end of the condenser tube (12) is connected to the inlet pipe (2) and the first exhaust pipe (3) at the same time. The bottom end of the condenser tube (12) is connected to the diversion pipe (13). The diversion pipe (13) and the condenser tube (12) work together to form an inverted T shape.

2. The high-concentration ammonia absorption adsorption tower according to claim 1, characterized in that: The middle position of the shunt pipe (13) is provided with a groove (14) at the bottom end where the condenser pipe (12) is connected.

3. The high-concentration ammonia absorption adsorption tower according to claim 1, characterized in that: The upper end of one side of the refrigeration box (8) is connected to the water inlet pipe (11), and the lower end of the other side of the refrigeration box (8) is connected to the drain pipe (9).

4. The high-concentration ammonia absorption adsorption tower according to claim 1, characterized in that: The lower end of the adsorption tower body (7) is connected to a drain pipe (10). One end of the drain pipe (10) passes through the inner wall of the adsorption tower body (7) and the inner wall of the refrigeration box (8) and is fixed by a shaft seal. A valve is also installed on the drain pipe (10).

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