Aluminum ash treatment reaction slurry temperature control system
By shifting the cooling point to the conveying pipeline and using a circulating water pump to cool the aluminum ash during the aluminum ash treatment process, the problem of insufficient temperature caused by external cooling of the reaction tank was solved, achieving more efficient harmless treatment of aluminum ash and increased ammonia production.
Patent Information
- Application Number
- CN202520049742.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-09
AI Technical Summary
In the existing process of harmless treatment of aluminum ash, the external cooling coil of the reaction tank causes the slurry temperature to drop below 85°C, resulting in ammonia dissolving in the slurry, a decrease in ammonia water production, incomplete reaction, large cooling water consumption, and high energy consumption.
The cooling point of the slurry is moved from the reaction tank to the conveying pipeline between the reaction tank and the hose pump. A cooling coil driven by a circulating water pump is used to cool the conveying pipeline, and a temperature sensor is installed at the inlet of the hose pump to control the temperature and meet the feeding requirements of the hose pump.
It improved the harmless treatment effect of aluminum ash, reduced the amount of circulating water used, increased the production of ammonia water, and reduced energy consumption.
Smart Images
Figure CN223819336U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of harmless treatment technology of aluminum ash, specifically relating to a temperature control system for aluminum ash treatment reaction slurry. Background Technology
[0002] Aluminum ash mainly consists of metallic aluminum and its oxides, aluminum nitride (AlN), fluorides (such as NaF, KF, MgF2, Na3AlF6, and LiF), and chlorides (such as KCl, NaCl, and MgCl2), and has high recycling value. The harmless treatment of aluminum ash generally involves processes such as ammonia removal through reaction of aluminum ash with water, ammonia absorption, slurry filtration, concentrated brine precipitation, and pure brine evaporation and crystallization. In the reaction of aluminum ash with water, water and aluminum ash are mixed in a batching tank and then enter the reaction tank. Generally, three reaction tanks are prepared. The high-temperature mixed gas generated by water and aluminum ash in the reaction tank is cooled by a gas-liquid separator and then sent to an ammonia absorption tower. The slurry at the bottom of the reaction tank is conveyed to a vacuum belt filter. Due to the high salt content in aluminum ash, corrosion-resistant flexible hose pumps must be used for material transportation between batching tanks and reaction tanks, between reaction tanks, and between reaction tanks and filters. However, the feed temperature requirements for these flexible hose pumps are very stringent (not exceeding 85℃), and currently, they can only be imported. To meet the requirements of the flexible hose pump and reduce the operating costs of enterprises, a cooling coil is usually wrapped around the outside of the reaction tank, and a temperature sensor is installed inside the reaction tank. When the reaction temperature of the slurry in the reaction tank exceeds 85°C, cooling water enters the cooling coil to cool the reaction tank. The flexible hose pump is started to discharge the slurry after the temperature of the slurry is lower than 85°C. After long-term operation, it was found that this cooling method of wrapping the coil around the outside of the reaction tank has the following disadvantages: (1) When the temperature of the slurry in the reaction tank is lower than 85°C, a large amount of ammonia gas will dissolve in the slurry and cannot reach the concentrated ammonia absorption tower, resulting in a decrease in ammonia water production; (2) When the temperature of the slurry in the reaction tank is lower than 85°C, the aluminum nitride and metallic aluminum in the slurry will not react completely, resulting in poor harmless treatment effect; (3) The cooling water consumption is large and the energy consumption is high. Therefore, it is necessary to improve the cooling method of the reaction tank so as to meet the feeding requirements of the flexible hose pump and ensure the harmless treatment effect of aluminum ash. Summary of the Invention
[0003] This invention addresses the technical problems of poor aluminum ash treatment efficiency, reduced ammonia production, and high cooling water consumption caused by existing cooling methods in reaction tanks. It provides a temperature control system for aluminum ash treatment reaction slurry, which improves the aluminum ash treatment effect, reduces the amount of circulating water used, and increases ammonia production by changing the cooling position of the slurry.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A temperature control system for an aluminum ash treatment reaction slurry includes a batching tank and a first reaction tank, a second reaction tank, and a third reaction tank connected in sequence. A first flexible hose pump is installed on the connecting pipe between the batching tank and the first reaction tank. A second flexible hose pump and a third flexible hose pump are respectively installed on the connecting pipes between the first reaction tank, the second reaction tank, and the third reaction tank. A fourth flexible hose pump is installed on the connecting pipe between the third reaction tank and a vacuum belt filter. A first cooling coil is wound on the pipe between the bottom outlet of the first reaction tank and the inlet of the second flexible hose pump. A second cooling coil is wound on the pipe between the bottom outlet of the second reaction tank and the inlet of the third flexible hose pump. A third cooling coil is wound on the pipe between the bottom outlet of the third reaction tank and the inlet of the fourth flexible hose pump.
[0006] In the above-described scheme of this utility model, the cooling medium for the first cooling coil, the second cooling coil, and the third cooling coil is circulating water. The inlets of the first cooling coil, the second cooling coil, and the third cooling coil are respectively connected to circulating water pumps, and each circulating water pump supplies water to the corresponding cooling coil.
[0007] In order to better control the feed temperature of each hose pump in the above-mentioned solution of this utility model, temperature sensors are installed at the inlet of the second hose pump, the third hose pump and the fourth hose pump. When the temperature sensor detects that the slurry temperature at the inlet of the corresponding hose pump exceeds 85°C, it sends a signal to the corresponding circulating water pump to start the circulating water pump. The circulating water enters the corresponding cooling coil to cool the slurry pipeline, so that the slurry temperature is lower than 85°C, thus meeting the feed requirements of the hose pump.
[0008] In the above-described scheme of this utility model, the top gas outlets of the first reaction tank, the second reaction tank, and the third reaction tank are connected. The high-temperature mixed gas generated in the reaction tank is cooled down by a gas-liquid separator and then sent to the ammonia absorption tower.
[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0010] This invention moves the cooling of the slurry from the reaction tank to the conveying pipeline between the reaction tank and the hose pump. This cooling of the conveying pipeline not only meets the feed temperature requirements of the hose pump but also greatly reduces the amount of circulating water used. It also increases the temperature inside the reaction tank, allowing for a more complete reaction of aluminum nitride and metallic aluminum, thus improving the harmless treatment effect. In addition, it facilitates the entry of volatile gases such as ammonia into the upper part of the reaction tank, thereby increasing the ammonia production. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of a temperature control system for an aluminum ash treatment reaction slurry according to the present invention.
[0012] In the attached diagram, the following labels are used: 1 is the mixing tank, 2-1 is the first reaction tank, 2-2 is the second reaction tank, 2-3 is the third reaction tank, 3-1 is the first hose pump, 3-2 is the second hose pump, 3-3 is the third hose pump, 3-4 is the fourth hose pump, 4-1 is the first cooling coil, 4-2 is the second cooling coil, and 4-3 is the third cooling coil. Detailed Implementation
[0013] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of protection of the present invention.
[0014] like Figure 1 As shown, a temperature control system for an aluminum ash treatment reaction slurry includes a batching tank 1 and a first reaction tank 2-1, a second reaction tank 2-2, and a third reaction tank 2-3 connected in sequence. A first flexible hose pump 3-1 is installed on the connecting pipe between the batching tank 1 and the first reaction tank 2-1. A second flexible hose pump 3-2 and a third flexible hose pump 3-3 are respectively installed on the connecting pipes between the first reaction tank 2-1, the second reaction tank 2-2, and the third reaction tank 2-3. A fourth flexible hose pump 3-4 is installed on the connecting pipe between the third reaction tank 2-3 and the vacuum belt filter. A first cooling coil 4-1 is wound around the pipe between the bottom outlet of the first reaction tank 2-1 and the inlet of the second flexible hose pump 3-2. A second cooling coil 4-2 is wound around the pipe between the bottom outlet of the second reaction tank 2-2 and the inlet of the third flexible hose pump 3-3. A third cooling coil 4-3 is wound around the pipe between the bottom outlet of the third reaction tank 2-3 and the inlet of the fourth flexible hose pump 3-4.
[0015] In this embodiment, the cooling medium used in the first cooling coil 4-1, the second cooling coil 4-2, and the third cooling coil 4-3 is circulating water. The inlets of the first cooling coil 4-1, the second cooling coil 4-2, and the third cooling coil 4-3 are respectively connected to a circulating water pump (not shown in the figure), and the outlets are connected to the factory's circulating water pool. Each circulating water pump supplies water to the corresponding cooling coil. In this way, only the conveying pipeline with a slurry temperature exceeding 85°C can be cooled, reducing the amount of cooling water used and lowering energy consumption.
[0016] To better control the feed temperature of each hose pump, temperature sensors (model: WZP-440, Zhejiang Zhongkong Automation Instrument Co., Ltd.) are installed at the inlet of the second hose pump 3-2, the third hose pump 3-3, and the fourth hose pump 3-4. When the temperature sensor detects that the slurry temperature at the inlet of the corresponding hose pump exceeds 85℃, it sends a signal to the corresponding circulating water pump, starts the circulating water pump, and the circulating water enters the corresponding cooling coil to cool the slurry pipeline, so that the slurry temperature is lower than 85℃, which meets the feed requirements of the hose pump.
[0017] During the harmless treatment of aluminum ash, water and aluminum ash are batched in batching tank 1 and then enter the first reaction tank 2-1, the second reaction tank 2-2, and the third reaction tank 2-3. The high-temperature mixed gas and slurry generated by the water and aluminum ash in the reaction tanks contain ammonia, methane, hydrogen, hydrogen sulfide, and a large amount of water vapor. Since the top gas outlets of the first reaction tank 2-1, the second reaction tank 2-2, and the third reaction tank 2-3 are connected, the high-temperature mixed gas generated in the reaction tanks is cooled by a gas-liquid separator and then sent to an ammonia absorption tower for ammonia recovery. The liquid outlet at the bottom of the gas-liquid separator is connected to a brine tank to provide batching water for batching tank 1.
[0018] Because a higher temperature inside the reaction tank leads to a more complete reaction and facilitates the escape of volatile gases such as ammonia, this invention shifts the cooling position of the slurry from the reaction tank to the conveying pipeline between the reaction tank and the hose pump. This cooling of the conveying pipeline not only meets the feed temperature requirements of the hose pump but also significantly reduces the amount of circulating water used. Furthermore, it raises the temperature inside the reaction tank, allowing for a more complete reaction of aluminum nitride and metallic aluminum, thus improving the harmless treatment effect. It also helps volatile gases such as ammonia to enter the upper part of the reaction tank, thereby increasing the ammonia water production.
[0019] The embodiments described above are merely preferred embodiments of this utility model and are only used to explain this utility model. They are not intended to limit the scope of implementation of this utility model. For those skilled in the art, other implementation methods can be easily made by substitution or modification based on the technical content disclosed in this specification. Therefore, all changes and improvements made on the principle of this utility model should be included within the scope of the patent application of this utility model.
Claims
1. A temperature control system for an aluminum ash treatment reaction slurry, comprising a batching tank (1) and a first reaction tank (2-1), a second reaction tank (2-2), and a third reaction tank (2-3) connected in sequence, characterized in that, A first flexible hose pump (3-1) is installed on the connecting pipe between the mixing tank (1) and the first reaction tank (2-1). A second flexible hose pump (3-2) and a third flexible hose pump (3-3) are respectively installed on the connecting pipe between the first reaction tank (2-1), the second reaction tank (2-2), and the third reaction tank (2-3). A fourth flexible hose pump (3-4) is installed on the connecting pipe between the third reaction tank (2-3) and the vacuum belt filter. A first cooling coil (4-1) is wound on the pipe between the bottom outlet of the first reaction tank (2-1) and the inlet of the second flexible hose pump (3-2). A second cooling coil (4-2) is wound on the pipe between the bottom outlet of the second reaction tank (2-2) and the inlet of the third flexible hose pump (3-3). A third cooling coil (4-3) is wound on the pipe between the bottom outlet of the third reaction tank (2-3) and the inlet of the fourth flexible hose pump (3-4).
2. The temperature control system for the aluminum ash treatment reaction slurry according to claim 1, characterized in that, The cooling medium for the first cooling coil (4-1), the second cooling coil (4-2), and the third cooling coil (4-3) is circulating water.
3. The temperature control system for the reaction slurry in aluminum ash treatment according to claim 1, characterized in that, The inlets of the first cooling coil (4-1), the second cooling coil (4-2), and the third cooling coil (4-3) are respectively connected to the circulating water pump.
4. The temperature control system for the reaction slurry in aluminum ash treatment according to claim 1, characterized in that, Temperature sensors are installed at the inlets of the second hose pump (3-2), the third hose pump (3-3), and the fourth hose pump (3-4).
5. The temperature control system for the aluminum ash treatment reaction slurry according to claim 1, characterized in that, The top gas outlets of the first reaction vessel (2-1), the second reaction vessel (2-2), and the third reaction vessel (2-3) are connected.