Ammonia gas absorption device and ammonium phosphate production system

Abstract

The utility model provides an ammonia gas absorption device and an ammonium phosphate production system. According to the ammonia gas absorption device, ammonia gas can be fully captured and absorbed in an ammonia gas escape height space through the spray headers which are arranged at the upper part of the absorption tower and are distributed along the height direction, and in addition, the gas outlet holes which are distributed along the height direction and are formed in the tail end of the gas inlet pipe in the absorption tower can fully bubble and absorb stored absorption liquid; the ammonia gas absorption efficiency is improved, the ammonia gas escape is reduced, and the environmental pollution is avoided.

Description

Technical Field

[0001] The utility model relates to the field of ammonia absorption, in particular to an ammonia absorption device and an ammonium phosphate production system. Background Art

[0002] Ammonia gas has a low boiling point and is highly irritating, which can easily cause environmental pollution. In the chemical industry, for example, in the liquid ammonia tank area, liquid ammonia unloading, and liquid ammonia vaporization, there will be a certain amount of ammonia leakage after the safety valve is activated, and a small amount of liquid ammonia will remain in the crane tank of the liquid ammonia unloading truck. The tail gas in the traditional liquid ammonia tank area is directly discharged or absorbed with water. Due to the low absorption pressure and incomplete absorption, the ammonia content in the tail gas is often as high as 6% to 7%, which can easily cause environmental pollution, the tail gas after water absorption does not meet the standard, and the generated ammonia water cannot be disposed of. It not only wastes resources but also causes environmental pollution.

[0003] How to efficiently absorb ammonia and reduce environmental pollution has become an urgent problem to be solved. Utility Model Content

[0004] The utility model provides an ammonia absorption system, which solves the defect of low ammonia absorption efficiency in the prior art.

[0005] The technical solution of the utility model is achieved in this way:

[0006] The ammonia absorption device comprises an absorption tower and a phosphoric acid tank which are connected. The absorption tower is provided with an air inlet pipe, the end of which extends to the bottom of the absorption tower and is provided with a plurality of air outlets distributed up and down. The upper part of the absorption tower is provided with spray heads distributed up and down, and the spray heads are connected with the phosphoric acid tank through an absorption liquid feed pipe.

[0007] Furthermore, the absorption tower is provided with a discharge pipe connected to the phosphoric acid tank, and the discharge pipe is arranged at a height higher than the uppermost air outlet.

[0008] Preferably, a delivery pump and a valve are provided on the absorption liquid feed pipe; the absorption tower is provided with an acidity meter 1, which is located below the discharge pipe; and the acidity meter 1 is interlocked with the valve.

[0009] Preferably, the absorption tower is also provided with a thermometer 1, which is located below the discharge pipe.

[0010] Furthermore, the shower heads are axially distributed at different heights.

[0011] Furthermore, the air inlet pipe is provided with a pressure gauge; and / or, the top of the absorption tower is provided with an ammonia detector.

[0012] The utility model also provides an ammonium phosphate production system, comprising the above-mentioned ammonia absorption device, wherein the absorption tower is provided with a discharge pipe connected with a phosphoric acid tank; the phosphoric acid tank is provided with a phosphoric acid feed pipe and two acidity meters.

[0013] Further, the installation height of the discharge pipe is higher than the uppermost air outlet hole in the absorption tower.

[0014] Further, the phosphoric acid tank is provided with a second thermometer; and / or, a stirring paddle is provided in the phosphoric acid tank.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] By arranging the spray heads distributed in the height direction of the upper part of the absorption tower, the present utility model can fully capture and absorb ammonia in the ammonia escape height space. In addition, the end of the inlet pipe in the absorption tower is provided with air outlet holes distributed in the height direction, which can fully bubble and absorb in the accumulated absorption liquid, improve the absorption efficiency of ammonia, reduce ammonia escape, and avoid environmental pollution. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the ammonia absorption device of the present utility model.

[0019] The reference numerals in the drawings are:

[0020] 1. Absorption tower; 11. Inlet pipe; 12. Discharge pipe; 100. Spray head; 110. Air outlet hole; 2. Phosphoric acid tank; 21. Absorption liquid feed pipe; 22. Phosphoric acid feed pipe; 23. Stirring paddle; F1. Delivery pump; H1. First pH meter; H2. Second pH meter; H3. Ammonia detector; K1. Valve; P1. Pressure gauge; T1. First thermometer; T2. Second thermometer. Detailed Embodiments

[0021] The following will clearly and completely describe the technical solutions of the present utility model in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Refer to Figure 1, in the first embodiment, an ammonia absorption device is proposed, which includes a connected absorption tower 1 and a phosphoric acid tank 2; the absorption tower 1 is provided with an inlet pipe 11, and the end of the inlet pipe 11 extends towards the bottom of the absorption tower 1 and is provided with a number of air outlet holes 110 distributed vertically; the upper part of the absorption tower 1 is provided with spray nozzles 100 distributed vertically, and the spray nozzles 100 are communicated with the phosphoric acid tank 2 through an absorption liquid feed pipe 21.

[0023] In the above embodiment, the ammonia absorption device can fully capture and absorb ammonia in the ammonia escape height space by setting spray nozzles distributed in the height direction of the upper part of the absorption tower. In addition, the end of the inlet pipe in the absorption tower is provided with air outlet holes distributed in the height direction, which can fully bubble and absorb in the accumulated absorption liquid, improve the ammonia absorption efficiency, reduce ammonia escape, and avoid environmental pollution.

[0024] In the above embodiment, the ammonia can be from any source such as production units, storage tanks, transport tanks, etc., including but not limited to ammonia by-products, tail gas remaining from liquid ammonia, etc.

[0025] In a preferred embodiment, the absorption tower 1 is provided with a discharge pipe 12 communicated with the phosphoric acid tank 2, and the installation height of the discharge pipe 12 is higher than the uppermost air outlet hole 110. When the dilute phosphoric acid from the phosphoric acid tank enters the absorption tower 1 and the liquid level is higher than the air outlet hole 110, it will overflow into the phosphoric acid tank 2. Ammonia from all the air outlet holes 110 enters the accumulated phosphoric acid absorption liquid for absorption, further improving the absorption efficiency, and the ammonia absorption efficiency can reach more than 99.9%.

[0026] In a preferred embodiment, a delivery pump F1 and a valve K1 are provided on the absorption liquid feed pipe 21; the absorption tower 1 is provided with a pH meter H1, which is located below the discharge pipe 12; the pH meter H1 is interlocked with the valve K1. The opening and closing degree of the valve K1 is automatically controlled by monitoring the pH value of the accumulated absorption liquid through the pH meter H1, so as to realize the automatic replenishment of the absorption liquid and the automatic overflow of the discharge pipe 12.

[0027] In a preferred embodiment, the absorption tower 1 is further provided with a thermometer T1, which is located below the discharge pipe 12 and is used to monitor the temperature of the absorption process.

[0028] In a preferred embodiment, the spray nozzles 100 are axially distributed at different heights, and the spray nozzles distributed in the height direction and the horizontal direction reduce the possible escape of ammonia and improve the absorption rate.

[0029] In a preferred embodiment, the tail gas after being absorbed by dilute phosphoric acid in the above absorption device meets the environmental protection standard of NH3≤50 Nm 3 / h, the inlet pipe 11 is provided with a pressure gauge P1 for monitoring the pressure; the top of the absorption tower 1 is provided with an ammonia detector H3 for detecting the ammonia concentration at the top of the tower.

[0030] In another embodiment, as Figure 1 shown, a ammonium phosphate production system is proposed, which includes the ammonia absorption device described in the above embodiment. The absorption tower 1 is provided with a discharge pipe 12 communicating with the phosphoric acid tank 2; the phosphoric acid tank 2 is provided with a phosphoric acid feed pipe 22 for supplementing dilute phosphoric acid, and a second pH meter H2 for monitoring whether the phosphoric acid is completely neutralized by the ammonia reaction; the phosphoric acid tank 2 is provided with a second thermometer T2 for monitoring the temperature, and a stirring paddle 23 is arranged in the phosphoric acid tank 2.

[0031] In the above embodiment, during the cyclic absorption process, the stirring paddle 23 is turned on for stirring, and by monitoring the pH value of the second pH meter H2, it is judged whether the dilute phosphoric acid in the phosphoric acid tank 2 is completely reacted with ammonia to obtain relatively pure ammonium phosphate.

[0032] In the above embodiment, the first pH meter H1 and the second pH meter H2 are common pH meters for monitoring pH. The ammonia detector H3 selects a common electronic instrument for detecting the ammonia concentration in the environment, and a concentration threshold for up-to-standard discharge can be set. When the detected concentration is higher than the threshold concentration, an alarm is generated, which can remind to reduce the ammonia feed amount or increase the amount of dilute phosphoric acid absorption liquid to achieve up-to-standard discharge.

[0033] In the above embodiment, through the setting of the ammonia absorption device in combination with the phosphoric acid tank 2, the efficient absorption of ammonia and the production of ammonium phosphate are realized. The ammonium phosphate compound fertilizer is obtained through drying, or can be directly utilized through the compound fertilizer production device.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An ammonia absorption device, characterized in that, It includes a connected absorption tower (1) and a phosphoric acid tank (2); the absorption tower (1) is provided with an inlet pipe (11), the end of the inlet pipe (11) extends towards the bottom of the absorption tower (1) and is provided with a number of air outlet holes (110) distributed vertically; the upper part of the absorption tower (1) is provided with spray heads (100) distributed vertically, and the spray heads (100) are connected to the phosphoric acid tank (2) through an absorption liquid feed pipe (21); the absorption tower (1) is provided with a discharge pipe (12) connected to the phosphoric acid tank (2), and the installation height of the discharge pipe (12) is higher than the uppermost air outlet hole (110).

2. The ammonia absorption device according to claim 1, wherein, A delivery pump (F1) and a valve (K1) are provided on the absorption liquid feed pipe (21); the absorption tower (1) is provided with a first acidity meter (H1), which is located below the discharge pipe (12); the first acidity meter (H1) is interlocked with the valve (K1).

3. The ammonia absorption device according to claim 1, characterized in that, The absorption tower (1) is further provided with a first thermometer (T1), which is located below the discharge pipe (12).

4. The ammonia absorption device according to claim 1, wherein, The spray heads (100) are arranged axially at different heights.

5. The ammonia absorption device according to claim 1, wherein The inlet pipe (11) is provided with a pressure gauge (P1); and / or, an ammonia detector (H3) is provided at the top of the absorption tower (1).

6. Ammonium phosphate production system, characterized in that, It includes the ammonia absorption device described in claim 1; the phosphoric acid tank (2) is provided with a phosphoric acid feed pipe (22) and a second acidity meter (H2).

7. The ammonium phosphate production system according to claim 6, characterized in that, The phosphoric acid tank (2) is provided with a second thermometer (T2); and / or, a stirring paddle (23) is provided inside the phosphoric acid tank (2).

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