Integrated high-efficiency ammonia recovery device

Abstract

The present invention discloses an integrated high-efficiency ammonia recovery device, including a recovery tower; a multi-stage ammonia washing purification mechanism, wherein the multi-stage ammonia washing purification mechanism is composed of a spray tower, an adsorption tower and a purifier. The present invention can perform deep purification treatment on ammonia-containing gas through the synergistic effect of the multi-stage ammonia washing purification mechanism, including the spray tower, the adsorption tower and the purifier, to ensure that the gas entering the recovery tower meets the requirements. The spiral coil cooler in the cooling mechanism can quickly cool the gas in the recovery tower, and accurately control the cooling effect with the temperature sensor, which is conducive to the crystallization and precipitation of ammonia. The agitator in the continuous crystallizer evenly mixes the solution to promote the formation and growth of ammonia crystals. The centrifugal pump and the flow valve return the crystallized solution to the solution tank for recycling. The seed tank provides seeds, and the screw conveyor conveys seeds to assist crystallization, thereby efficiently recovering ammonia resources, realizing the recycling of resources, reducing the demand for new ammonia resources, and reducing production costs.

Description

Technical Field

[0001] The invention relates to the field of ammonia recovery, and in particular to an integrated high-efficiency ammonia recovery device. Background Art

[0002] Ammonia is widely used in many fields such as industrial production, agriculture and daily life. For example, in the chemical industry, ammonia is an important raw material for the production of fertilizers, synthetic fibers, plastics and other chemical products; in the agricultural field, ammonia is often used to make nitrogen fertilizers, which plays a vital role in increasing crop yields. However, in many production processes, a large amount of waste gas or waste liquid containing ammonia will be generated. If it is not recycled and treated, it will not only cause a waste of resources, but also cause serious pollution to the environment. For example, ammonia emissions into the atmosphere will form acid rain, causing damage to soil, water bodies and ecosystems; emissions into water bodies will cause eutrophication of water bodies and destroy the balance of aquatic ecology.

[0003] The ammonia recovery device of the prior art has a poor ammonia washing purification effect. It is difficult to fully remove the ammonia in the exhaust gas by only using a single purification method, resulting in the exhaust gas still containing a high concentration of ammonia, which cannot meet environmental protection requirements. Due to the lack of effective cooling and crystallization separation mechanism, the ammonia recovery efficiency is low, and ammonia cannot be effectively separated from the solution, affecting the recovery quality and output of ammonia. Summary of the invention

[0004] The object of the present invention is to provide an integrated high-efficiency ammonia recovery device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] Integrated high-efficiency ammonia recovery device, including

[0007] Recovery tower;

[0008] A multi-stage ammonia washing and purification mechanism, the multi-stage ammonia washing and purification mechanism is composed of a spray tower, an adsorption tower and a purifier, the air outlet of the spray tower is connected to the air inlet of the adsorption tower through a pipeline, the air outlet of the adsorption tower is connected to the air inlet of the purifier through a pipeline, and the air inlet of the spray tower is provided with an air inlet pipe;

[0009] A cooling mechanism, the cooling mechanism being arranged above the interior of the recovery tower;

[0010] A crystal separation mechanism is disposed below the interior of the recovery tower and is communicated with the interior of the recovery tower.

[0011] Furthermore, a solution tank is arranged on the left side of the spray tower, and the solution tank is connected to the bottom end of the spray tower through a connecting pipe. A plurality of atomizing sprayers are arranged in sequence from top to bottom at the inner upper end of the spray tower, and a metering pump is arranged on one side of the solution tank. The metering pump is connected to the atomizing sprayer through a pipeline, and the other end of the metering pump is connected to the solution tank through a pipeline.

[0012] Furthermore, an activated carbon adsorbent is arranged in the middle of the inner side of the adsorption tower, and the activated carbon adsorbent has a regular pore structure and a large specific surface area.

[0013] Furthermore, a water curtain nozzle is arranged above the interior of the purifier, and a plurality of mesh filter plates are arranged side by side below the interior of the purifier. The pipeline 1 is connected to the water curtain nozzle through a tee, and is connected to the recovery tower through the pipeline 2 at the gas outlet of the purifier.

[0014] Furthermore, an online monitor, a Roots vacuum pump and a switching valve are sequentially arranged on the second pipeline, and the other end of the switching valve is connected to an exhaust port.

[0015] Furthermore, the cooling mechanism comprises a spiral coil cooler, both ends of the spiral coil cooler penetrate the recovery tower and are respectively connected to a cold water inlet and a cold water outlet, and a temperature sensor is arranged on the cold water inlet.

[0016] Furthermore, the crystallization separation mechanism includes a continuous crystallizer, which is connected to the bottom end of the recovery tower, an agitator is arranged inside the continuous crystallizer, a centrifugal pump is connected to the upper end of the continuous crystallizer through a pipeline, the other end of the centrifugal pump is connected to a solution tank through a pipeline, a flow valve is arranged between the centrifugal pump and the continuous crystallizer, and a belt conveyor is also arranged at the discharge port of the continuous crystallizer.

[0017] Furthermore, the crystallization separation mechanism also includes a seed tank, which is arranged on one side of the recovery tower, and a screw conveyor is arranged between the seed tank and the continuous crystallizer.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention can deeply purify the ammonia-containing gas through the synergistic effect of a multi-stage ammonia washing purification mechanism, including a spray tower, an adsorption tower and a purifier, to ensure that the gas entering the recovery tower meets the requirements. The spiral coil cooler in the cooling mechanism can quickly cool the gas in the recovery tower, and the temperature sensor can accurately control the cooling effect, which is conducive to the crystallization of ammonia. The agitator in the continuous crystallizer makes the solution evenly mixed to promote the formation and growth of ammonia crystals. The centrifugal pump and the flow valve return the crystallized solution to the solution tank for recycling. The seed tank provides seeds and the screw conveyor conveys seeds to assist crystallization, thereby efficiently recovering ammonia resources, realizing the recycling of resources, reducing the demand for new ammonia resources, and reducing production costs.

[0020] 2. During the operation of the present invention, the online monitor monitors the ammonia content, temperature, pressure and other parameters of the gas in the pipeline in real time. The Roots vacuum pump and the switching valve are adjusted accordingly according to the monitoring results. For example, when the ammonia content exceeds the standard, the operating parameters of the ammonia washing purification mechanism can be adjusted. When the device fails, the switching valve switches the airflow direction to avoid pollution. The various mechanisms cooperate with each other and operate in coordination to form a complete ammonia recovery system, thereby reducing the risks of production interruptions and environmental pollution caused by equipment failure or unstable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the integrated high-efficiency ammonia recovery device of the present invention.

[0022] In the figure: 1. Recovery tower; 101. Online monitor; 102. Roots vacuum pump; 103. Switching valve; 104. Exhaust port; 2. Spray tower; 201. Solution tank; 202. Connecting pipe; 203. Atomizing sprayer; 204. Measuring pump; 205. Pipeline one; 3. Adsorption tower; 301. Activated carbon adsorbent; 4. Purifier; 401. Water curtain nozzle; 402. Mesh filter plate; 403. Pipeline two; 5. Spiral coil cooler; 501. Cold water inlet; 502. Cold water outlet; 503. Temperature sensor; 6. Continuous crystallizer; 601. Agitator; 602. Centrifugal pump; 603. Pipeline three; 604. Flow valve; 605. Belt conveyor; 7. Seed tank; 8. Screw conveyor; 9. Inlet pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, the present invention provides a technical solution:

[0025] The integrated high-efficiency ammonia recovery device comprises a recovery tower 1; a multi-stage ammonia washing and purification mechanism, which is composed of a spray tower 2, an adsorption tower 3 and a purifier 4, wherein the gas outlet of the spray tower 2 is connected to the gas inlet of the adsorption tower 3 through a pipeline, the gas outlet of the adsorption tower 3 is connected to the gas inlet of the purifier 4 through a pipeline, and the gas inlet of the spray tower 2 is provided with an air inlet pipe 9; a cooling mechanism, which is arranged above the inside of the recovery tower 1; a crystallization separation mechanism, which is arranged below the inside of the recovery tower 1 and is connected to the inside of the recovery tower 1; a solution tank 201 is arranged on the left side of the spray tower 2, and a gap is formed between the solution tank 201 and the inside of the recovery tower 1; a cooling mechanism is arranged above the inside of the recovery tower 1; a crystallization separation mechanism ... crystallization separation mechanism is arranged below the inside of the recovery tower 1 and The bottom ends of the spray towers 2 are connected through a connecting pipe 202. A plurality of atomizing sprayers 203 are sequentially arranged at the upper end of the spray tower 2 from top to bottom. A metering pump 204 is arranged on one side of the solution tank 201. The metering pump 204 is connected to the atomizing sprayer 203 through a pipe 205. The other end of the metering pump 204 is connected to the solution tank 201 through a pipe. An activated carbon adsorbent 301 is arranged in the middle of the inner side of the adsorption tower 3. The activated carbon adsorbent 301 has a regular pore structure and a large specific surface area. A water curtain nozzle 401 is arranged above the inside of the purifier 4. A plurality of mesh filter plates 402 are provided, and the pipe 1 205 is connected to the water curtain nozzle 401 through a tee, and is connected to the recovery tower 1 through the pipe 2 403 at the gas outlet of the purifier 4; an online monitor 101, a Roots vacuum pump 102 and a switching valve 103 are arranged in sequence on the pipe 2 403, and an exhaust port 104 is connected to the other end of the switching valve 103; the cooling mechanism includes a spiral coil cooler 5, and both ends of the spiral coil cooler 5 penetrate the recovery tower 1 and are respectively connected to a cold water inlet 501 and a cold water outlet 502, and a temperature sensor 503 is arranged on the cold water inlet 501; a crystallization separation mechanism It includes a continuous crystallizer 6, which is connected to the bottom end of the recovery tower 1, an agitator 601 is arranged inside the continuous crystallizer 6, a centrifugal pump 602 is connected to the upper end of the continuous crystallizer 6 through a pipeline, the other end of the centrifugal pump 602 is connected to the solution tank 201 through a pipeline 603, a flow valve 604 is arranged between the centrifugal pump 602 and the continuous crystallizer 6, and a belt conveyor 605 is also arranged at the discharge port of the continuous crystallizer 6; the crystallization separation mechanism also includes a seed tank 7, the seed tank 7 is arranged on one side of the recovery tower 1, and a screw conveyor 8 is arranged between the seed tank 7 and the continuous crystallizer 6;

[0026] In this embodiment, through the synergistic effect of a multi-stage ammonia washing purification mechanism, including a spray tower 2, an adsorption tower 3 and a purifier 4, the ammonia-containing gas can be deeply purified to ensure that the gas entering the recovery tower 1 meets the requirements. The spiral coil cooler 5 in the cooling mechanism can quickly cool the gas in the recovery tower 1, and cooperate with the temperature sensor 503 to accurately control the cooling effect, which is conducive to the crystallization and precipitation of ammonia. The agitator 601 in the continuous crystallizer 6 makes the solution evenly mixed to promote the formation and growth of ammonia crystals. The centrifugal pump 602 and the flow valve 604 return the crystallized solution to the solution tank 201 for recycling. The seed tank 7 provides seeds and the screw conveyor 8 transports seeds to assist crystallization, thereby efficiently recovering ammonia resources, realizing the recycling of resources, reducing the demand for new ammonia resources, and reducing production costs.

[0027] During operation, the online monitor 101 monitors the ammonia content, temperature, pressure and other parameters of the gas in the pipeline in real time. The Roots vacuum pump 102 and the switching valve 103 are adjusted accordingly according to the monitoring results. For example, when the ammonia content exceeds the standard, the operating parameters of the ammonia washing purification mechanism can be adjusted. When the device fails, the switching valve 103 switches the airflow direction to avoid pollution. The various mechanisms cooperate with each other and operate in coordination to form a complete ammonia recovery system, reducing the risk of production interruption and environmental pollution caused by equipment failure or unstable operation.

[0028] Working principle: the waste gas containing ammonia enters the spray tower 2 through the air inlet pipe 9. In the spray tower 2, the washing ammonia solution in the solution tank 201 is transported to the atomizing sprayer 203 through the metering pump 204 and the pipeline 205. The atomizing sprayer 203 sprays the washing ammonia solution in atomized form, which fully contacts with the waste gas, so that the ammonia in the waste gas is absorbed by the washing ammonia solution, and the ammonia concentration is initially reduced. The waste gas treated by the spray tower 2 enters the adsorption tower 3 through the pipeline. The activated carbon adsorbent 301 in the adsorption tower 3 uses its regular pore structure and large specific surface area to further adsorb the residual ammonia molecules and other impurities, thereby achieving secondary purification. The purified waste gas The exhaust gas enters the purifier 4 again. Inside the purifier 4, the water curtain sprayed by the water curtain nozzle 401 purifies the exhaust gas again. The mesh filter plate 402 further filters the tiny particles and impurities in the exhaust gas to ensure that the exhaust gas is fully purified and automatically flushed and cleaned by the water curtain sprayed by the water curtain nozzle 401 to ensure that it can be reused. The gas purified by multi-stage ammonia washing enters the recovery tower 1 through the pipeline 2 403. The spiral coil cooler 5 arranged above the inside of the recovery tower 1 starts to work. The cooling medium enters the spiral coil cooler 5 from the cold water inlet 501, circulates in the coil and flows out from the cold water outlet 502. Through the heat exchange The temperature of the gas and solution in the recovery tower 1 is reduced, and the solubility of ammonia in the solution is increased, creating conditions for subsequent crystallization and separation. The temperature sensor 503 monitors the temperature of the cooling medium in real time so as to adjust the cooling parameters as needed; the cooled solution flows into the continuous crystallizer 6 at the bottom of the recovery tower 1. In the continuous crystallizer 6, the agitator 601 stirs the solution to make the solution evenly mixed, which is conducive to the growth and separation of crystals. The seeds in the seed tank 7 are transported to the continuous crystallizer 6 through the screw conveyor 8 to provide crystal nuclei for the formation of ammonium sulfate crystals and promote the growth of crystals. As the crystals continue to grow and aggregate, The larger crystals are precipitated to the bottom of the continuous crystallizer 6 and discharged through the belt conveyor 605, thereby realizing the crystallization separation and recovery of ammonia. At the same time, the supernatant at the upper end of the continuous crystallizer 6 is refluxed to the solution tank 201 through the centrifugal pump 602 and the pipeline three 603, and continues to participate in the ammonia washing process to realize the recycling of the solution. The online monitor 101 arranged on the pipeline two 403 is used for real-time monitoring of parameters such as the ammonia concentration in the purified gas. The Roots vacuum pump 102 provides power for the transportation of the gas. The switching valve 103 can control the flow direction of the gas as needed. When the gas meets the standard, the passage is switched and discharged into the atmosphere through the exhaust port 104.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Integrated high-efficiency ammonia recovery device, characterized by: include Recovery tower (1); A multi-stage ammonia washing and purification mechanism, the multi-stage ammonia washing and purification mechanism is composed of a spray tower (2), an adsorption tower (3) and a purifier (4), the air outlet of the spray tower (2) is connected to the air inlet of the adsorption tower (3) through a pipeline, the air outlet of the adsorption tower (3) is connected to the air inlet of the purifier (4) through a pipeline, and the air inlet of the spray tower (2) is provided with an air inlet pipe (9); A cooling mechanism, the cooling mechanism being arranged above the interior of the recovery tower (1); A crystallization separation mechanism, wherein the crystallization separation mechanism is arranged at the lower part of the recovery tower (1) and is communicated with the interior of the recovery tower (1).

2. The integrated high-efficiency ammonia recovery device according to claim 1, characterized in that: A solution tank (201) is arranged on the left side of the spray tower (2), and the solution tank (201) is connected to the bottom end of the spray tower (2) via a connecting pipe (202). A plurality of atomizing sprayers (203) are arranged in sequence from top to bottom at the inner upper end of the spray tower (2). A metering pump (204) is arranged on one side of the solution tank (201), and the metering pump (204) is connected to the atomizing sprayer (203) via a pipeline 1 (205). The other end of the metering pump (204) is connected to the solution tank (201) via a pipeline.

3. The integrated high-efficiency ammonia recovery device according to claim 1 is characterized in that: An activated carbon adsorbent (301) is arranged in the middle of the inner side of the adsorption tower (3), and the activated carbon adsorbent (301) has a regular pore structure and a large specific surface area.

4. The integrated high-efficiency ammonia recovery device according to claim 2 is characterized in that: A water curtain nozzle (401) is arranged above the interior of the purifier (4), and a plurality of mesh filter plates (402) are arranged side by side below the interior of the purifier (4). The pipeline 1 (205) is connected to the water curtain nozzle (401) through a tee, and is connected to the recovery tower (1) through a pipeline 2 (403) at the gas outlet end of the purifier (4).

5. The integrated high-efficiency ammonia recovery device according to claim 4 is characterized in that: An online monitor (101), a Roots vacuum pump (102) and a switching valve (103) are sequentially arranged on the second pipeline (403), and an exhaust port (104) is connected to the other end of the switching valve (103).

6. The integrated high-efficiency ammonia recovery device according to claim 1, characterized in that: The cooling mechanism comprises a spiral coil cooler (5), and both ends of the spiral coil cooler (5) penetrate the recovery tower (1) and are respectively connected to a cold water inlet (501) and a cold water outlet (502), and a temperature sensor (503) is arranged on the cold water inlet (501).

7. The integrated high-efficiency ammonia recovery device according to claim 1 is characterized in that: The crystallization separation mechanism comprises a continuous crystallizer (6), the bottom end of the recovery tower (1) is connected to the continuous crystallizer (6), an agitator (601) is arranged inside the continuous crystallizer (6), the upper end of the continuous crystallizer (6) is connected to a centrifugal pump (602) through a pipeline, the other end of the centrifugal pump (602) is connected to a solution tank (201) through a pipeline three (603), a flow valve (604) is arranged between the centrifugal pump (602) and the continuous crystallizer (6), and a belt conveyor (605) is also arranged at the discharge port of the continuous crystallizer (6).

8. The integrated high-efficiency ammonia recovery device according to claim 7, characterized in that: The crystallization separation mechanism also includes a seed tank (7), which is arranged on one side of the recovery tower (1), and a screw conveyor (8) is arranged between the seed tank (7) and the continuous crystallizer (6).

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