Device for producing ammonium bicarbonate by using melamine and ammonium nitrate co-production tail gas

Abstract

The utility model belongs to the technical field of ammonium bicarbonate production devices, and particularly relates to a device for producing ammonium bicarbonate from melamine co-production ammonium nitrate tail gas. The utility model relates to a device for producing ammonium bicarbonate from tail gas produced by co-production of melamine and ammonium nitrate, which comprises a tail gas treatment unit, a carbon dioxide compression and mixing unit, a carbonization reaction unit, a recycling, cleaning and circulating unit and a product treatment unit, the carbon dioxide compressing and mixing unit is connected with the carbonization reaction unit, the carbonization reaction unit is connected with the recycling, cleaning and circulating unit, and the carbonization reaction unit is connected with the product processing unit. According to the device for producing ammonium bicarbonate by co-producing melamine and ammonium nitrate tail gas, efficient and continuous production of ammonium bicarbonate is achieved, meanwhile, the scabbing phenomenon of the carbonization tower is reduced, and the resource utilization rate is increased.

Description

Technical Field

[0001] This utility model belongs to the technical field of ammonium bicarbonate production equipment, specifically relating to an equipment for producing ammonium bicarbonate from the tail gas of melamine co-production of ammonium nitrate. Background Technology

[0002] In chemical industrial production, the co-production of ammonium nitrate from melamine is an important process, which generates a large amount of neutralization tail gas. The main component of this tail gas is high-concentration carbon dioxide, which can reach approximately 95%, while the remainder is primarily nitrogen. This tail gas resource, due to its abundant carbon dioxide content, has significant potential for utilization. However, using this tail gas to produce ammonium bicarbonate in traditional processes faces numerous challenges.

[0003] In traditional processes, the direct introduction of high-concentration carbon dioxide tail gas into the carbonization tower for ammonium bicarbonate production often leads to severe scaling inside the tower. This scaling not only affects the normal operation of the equipment and reduces production efficiency but also increases maintenance costs. More seriously, scaling reduces the effective reaction area inside the carbonization tower, thereby impacting product quality and yield.

[0004] Furthermore, the carbon dioxide concentration in the exhaust gas emitted from the carbonization tower in traditional processes remains relatively high. This means that a significant amount of carbon dioxide resources are not being fully utilized but are being directly released into the atmosphere, resulting in resource waste and environmental pollution. Clearly, this runs counter to the principles of energy conservation, emission reduction, and green production.

[0005] Therefore, how to effectively utilize the carbon dioxide resources in the tail gas from the co-production of ammonium nitrate with melamine, while avoiding the scaling phenomenon in the carbonization tower, has become an urgent problem to be solved. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the above-mentioned defects in the existing technology and provide a device for producing ammonium bicarbonate from the tail gas of melamine co-production of ammonium nitrate, so as to realize the efficient and continuous production of ammonium bicarbonate, while reducing the scaling phenomenon of carbonation tower and improving resource utilization.

[0007] The apparatus for producing ammonium bicarbonate from melamine co-production ammonium nitrate tail gas according to this utility model includes a tail gas treatment unit, a carbon dioxide compression and mixing unit, a carbonization reaction unit, a recovery, cleaning and recycling unit, and a product processing unit. The tail gas treatment unit is connected to the carbon dioxide compression and mixing unit, the carbon dioxide compression and mixing unit is connected to the carbonization reaction unit, the carbonization reaction unit is connected to the recovery, cleaning and recycling unit, and the carbonization reaction unit is connected to the product processing unit.

[0008] Preferably, the exhaust gas treatment unit includes a cooler and a separator. The cooler is connected to an exhaust gas pipeline, and the cooler is connected to the separator to cool and separate the exhaust gas from the melamine co-production of ammonium nitrate.

[0009] Preferably, the carbon dioxide compression and mixing unit includes a carbon dioxide compressor, a gas mixing device, and a nitrogen circulator. The carbon dioxide compressor is connected to the gas mixing device, and the nitrogen circulator is connected to the gas mixing device. The gas mixing device is equipped with a carbon dioxide concentration detector, and the carbon dioxide mass concentration is controlled at 40-60% after mixing nitrogen and carbon dioxide.

[0010] Preferably, the separator is connected to a carbon dioxide compressor.

[0011] Preferably, the carbonization reaction unit includes a main carbonization tower and a secondary carbonization tower, which are connected together. After passing through the carbonization reaction unit, crude ammonium bicarbonate is obtained.

[0012] Preferably, the gas mixing device is connected to the carbonization main tower.

[0013] Preferably, the recovery, cleaning, and circulation unit includes a carbonization recovery tower and a carbonization recovery tower separator. The carbonization recovery tower and the carbonization recovery tower separator are connected, and the gas outlet of the carbonization recovery tower separator is connected to a nitrogen circulation machine. After passing through the recovery, cleaning, and circulation unit, the recovered nitrogen continues to enter the nitrogen circulation machine for recycling.

[0014] Preferably, the carbonization auxiliary tower is connected to the carbonization return tower.

[0015] Preferably, the product processing unit includes a thickener, a centrifuge, and an automated packaging machine. The thickener is connected to the centrifuge, the centrifuge is connected to the automated packaging machine, and the material inlet of the thickener is connected to the carbonization return tower.

[0016] The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas, as described in this invention, involves the following steps: During operation, the melamine co-production of ammonium nitrate tail gas first enters a cooler for cooling, then enters a separator for separation, yielding a gas primarily composed of carbon dioxide. The separated carbon dioxide gas is then compressed by a carbon dioxide compressor, while a nitrogen circulation system provides nitrogen. The two gases are mixed in a gas mixing device, controlling the carbon dioxide concentration within the range of 40-60%. The mixed gas then enters the main carbonization tower for a carbonization reaction with ammonia water. The reacted gas enters a secondary carbonization tower for further carbonization. The gas exiting the secondary carbonization tower enters a carbonization recovery tower for cleaning and recovery. The recovered gas is then recycled back into the nitrogen circulation system. The crude product processed by the carbonization recovery tower enters a thickener for concentration, and then is sent to a centrifuge for solid-liquid separation to obtain the ammonium bicarbonate product. Finally, it is packaged by an automated packaging machine.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This utility model relates to an apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas. By precisely controlling the concentration of carbon dioxide entering the carbonization tower, it effectively reduces the scaling rate of the carbonization tower, extends the service life of the equipment, realizes continuous production of the carbonization reaction, improves production efficiency and product quality, makes full use of the carbon dioxide resources in the tail gas, reduces resource waste and environmental pollution, and features a compact structure, simple operation, easy automation control, and reduced production costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the apparatus for producing ammonium bicarbonate from the tail gas of melamine co-production of ammonium nitrate according to this utility model.

[0020] In the diagram: 1. Cooler; 2. Separator; 3. Carbon dioxide compressor; 4. Gas mixing device; 5. Main carbonization tower; 6. Secondary carbonization tower; 7. Carbonization return tower; 8. Carbonization return tower separator; 9. Thickener; 10. Centrifuge; 11. Automated packaging machine; 12. Nitrogen circulator; 13. Carbon dioxide concentration detector; 14. Tail gas pipeline. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments.

[0022] like Figure 1As shown, the apparatus for producing ammonium bicarbonate from the tail gas of melamine co-production of ammonium nitrate includes a tail gas treatment unit, a carbon dioxide compression and mixing unit, a carbonization reaction unit, a recovery, cleaning and recycling unit, and a product processing unit. The tail gas treatment unit is connected to the carbon dioxide compression and mixing unit, the carbon dioxide compression and mixing unit is connected to the carbonization reaction unit, the carbonization reaction unit is connected to the recovery, cleaning and recycling unit, and the carbonization reaction unit is connected to the product processing unit.

[0023] The exhaust gas treatment unit includes a cooler 1 and a separator 2. The cooler 1 is connected to an exhaust gas pipeline 14. The cooler 1 is connected to the separator 2 to cool and separate the exhaust gas from the melamine co-production of ammonium nitrate.

[0024] The carbon dioxide compression and mixing unit includes a carbon dioxide compressor 3, a gas mixing device 4, and a nitrogen circulator 12. The carbon dioxide compressor 3 is connected to the gas mixing device 4, and the nitrogen circulator 12 is connected to the gas mixing device 4. The gas mixing device 4 is equipped with a carbon dioxide concentration detector 13, which controls the carbon dioxide mass concentration to be 40-60% after mixing nitrogen and carbon dioxide.

[0025] The separator 2 is connected to the carbon dioxide compressor 3.

[0026] The carbonization reaction unit includes a main carbonization tower 5 and a secondary carbonization tower 6, which are connected together. After passing through the carbonization reaction unit, crude ammonium bicarbonate is obtained.

[0027] The gas mixing device 4 is connected to the carbonization main tower 5.

[0028] The recovery, cleaning, and circulation unit includes a carbonization recovery tower 7 and a carbonization recovery tower separator 8. The carbonization recovery tower 7 and the carbonization recovery tower separator 8 are connected, and the gas outlet of the carbonization recovery tower separator 8 is connected to a nitrogen circulation machine 12. After passing through the recovery, cleaning, and circulation unit, the recovered nitrogen continues to enter the nitrogen circulation machine for recycling.

[0029] The carbonization auxiliary tower 6 is connected to the carbonization return tower 7.

[0030] The product processing unit includes a thickener 9, a centrifuge 10, and an automated packaging machine 11. The thickener 9 is connected to the centrifuge 10, the centrifuge 10 is connected to the automated packaging machine 11, and the material inlet of the thickener 9 is connected to the carbonization return tower 7.

[0031] The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas, as described in this invention, involves the following steps: During operation, the melamine co-production of ammonium nitrate tail gas first enters a cooler 1 for cooling, then enters a separator 2 for separation, yielding a gas primarily composed of carbon dioxide. The separated carbon dioxide gas then enters a carbon dioxide compressor 3 for compression, while a nitrogen circulator provides nitrogen. The two gases are mixed in a gas mixing device 4, controlling the carbon dioxide concentration within the range of 40-60%. The mixed gas then enters a carbonization main tower 5 for carbonization reaction with ammonia water. The reacted gas enters a carbonization auxiliary tower 6 for further carbonization reaction. The gas exiting the auxiliary tower 6 enters a carbonization recovery tower 7 for cleaning and recovery. The recovered gas enters a nitrogen circulator 12 for reuse. The crude product processed by the carbonization recovery tower 7 enters a thickener 9 for concentration, then is sent to a centrifuge 10 for solid-liquid separation to obtain the ammonium bicarbonate product. Finally, it is packaged by an automated packaging machine 11.

Claims

1. A device for producing ammonium bicarbonate from melamine co-production of ammonium nitrate off-gas, characterized by: The application relates to a carbonization device, which comprises a tail gas treatment unit, a carbon dioxide compression and mixing unit, a carbonization reaction unit, a recovery cleaning and circulation unit and a product treatment unit.

2. The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas according to claim 1, characterized in that: The tail gas treatment unit comprises a cooler (1) and a separator (2), the cooler (1) is connected with a tail gas pipeline (14), and the cooler (1) is connected with the separator (2).

3. The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas according to claim 2, characterized in that: The carbon dioxide compression and mixing unit comprises a carbon dioxide compressor (3), a gas mixing device (4) and a nitrogen circulating machine (12), the carbon dioxide compressor (3) is connected with the gas mixing device (4), the nitrogen circulating machine (12) is connected with the gas mixing device (4), and the gas mixing device (4) is provided with a carbon dioxide concentration detector (13).

4. The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas according to claim 3, characterized in that: The separator (2) is connected with the carbon dioxide compressor (3).

5. The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas according to claim 3, characterized in that: The carbonization reaction unit comprises a carbonization main tower (5) and a carbonization auxiliary tower (6), and the carbonization main tower (5) is connected with the carbonization auxiliary tower (6).

6. The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas according to claim 5, characterized in that: The gas mixing device (4) is connected with the carbonization main tower (5).

7. The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas according to claim 5, characterized in that: The recovery cleaning and circulation unit comprises a carbonization recovery cleaning tower (7) and a carbonization recovery cleaning tower separator (8), the carbonization recovery cleaning tower (7) is connected with the carbonization recovery cleaning tower separator (8), and the gas outlet of the carbonization recovery cleaning tower separator (8) is connected with the nitrogen circulating machine (12).

8. The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas according to claim 7, characterized in that: The carbonization auxiliary tower (6) is connected with the carbonization recovery cleaning tower (7).

9. The apparatus for producing ammonium bicarbonate from melamine co-production of ammonium nitrate tail gas according to claim 7, characterized in that: The product treatment unit comprises a thickener (9), a centrifugal machine (10) and an automatic packaging machine (11), the thickener (9) is connected with the centrifugal machine (10), the centrifugal machine (10) is connected with the automatic packaging machine (11), and the material inlet of the thickener (9) is connected with the carbonization recovery cleaning tower (7).

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