Ammonia stripping recovery device for metal ion ammonia solution

Abstract

This invention belongs to the field of wastewater treatment technology, specifically relating to an ammonia recovery and utilization device for metal ion ammonia solutions. It includes an input pipeline for conveying the metal ion ammonia solution, connected to the solution inlet of a heat exchanger, and then connected to an ammonia stripping tower, which is also connected to a first sprayer within the tower. The heating medium pipeline of the heat exchanger is connected to a first steam source. The upper outlet of the ammonia stripping tower is connected to the suction inlet of a jet pump. The working medium inlet of the jet pump is connected to a second steam source. The outlet of the jet pump outputs ammonia solution. The bottom outlet of the ammonia stripping tower is connected to a solid-liquid separator. The liquid outlet of the solid-liquid separator is connected to a second sprayer within the tower via a return pipeline. The solid outlet of the solid-liquid separator outputs solid product. This invention can efficiently recover ammonia from metal ion ammonia solutions while simultaneously recovering and utilizing the metal elements.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a device for the recovery and utilization of ammonia from metal ion ammonia solutions. Background Technology

[0002] In industries such as metallurgy, electroplating, and chemicals, the treatment of ammonia solutions containing copper ions, such as copper-ammonia washing solutions and wastewater containing copper-ammonia complexes, is a significant issue. Current methods for treating these solutions include chemical precipitation, adsorption, electrolysis, and evaporation. Evaporation holds the potential to recover both ammonia and metal resources, but existing evaporation technologies suffer from high energy consumption, easy scaling of equipment, low ammonia recovery efficiency, and incomplete metal recovery. For example, traditional evaporation equipment easily forms copper compound scale on the heating surface when treating copper-ammonia solutions, affecting heat transfer efficiency; moreover, the evaporation and separation of ammonia is not thorough enough, leading to a high load on subsequent treatment processes. Therefore, there is an urgent need for a highly efficient, energy-saving device that can simultaneously recover ammonia and metal elements. Utility Model Content

[0003] The purpose of this invention is to provide an ammonia recovery and utilization device for metal ion ammonia solutions, overcoming the technical problems in the prior art where heat transfer efficiency is easily affected and ammonia evaporation and separation are not thorough enough.

[0004] The aforementioned ammonia stripping and recovery device for metal ion ammonia solution includes an input pipeline for conveying the metal ion ammonia solution. The input pipeline is connected to the solution inlet of a heat exchanger and then connected to an ammonia stripping tower via the heat exchanger, and communicates with a first sprayer inside the ammonia stripping tower. The heating medium pipeline of the heat exchanger is connected to a first steam source. The upper outlet of the ammonia stripping tower is connected to the suction inlet of a jet pump. The working medium inlet of the jet pump is connected to a second steam source. The outlet of the jet pump outputs ammonia water product. The bottom outlet of the ammonia stripping tower is connected to a solid-liquid separator. The liquid outlet of the solid-liquid separator is connected to a second sprayer in the ammonia stripping tower via a return pipeline. The solid outlet of the solid-liquid separator outputs solid product.

[0005] Preferably, a second heat exchanger is provided on the return pipeline, the solution inlet of the second heat exchanger is connected to the liquid outlet of the solid-liquid separator, the outlet of the jet pump is connected to the output pipeline, and the output pipeline outputs ammonia water product after passing through the heating medium pipeline of the second heat exchanger.

[0006] Preferably, the first steam source and the second steam source are respectively equipped with a flow meter 1 and a flow meter 2 on the conveying pipelines; the input pipeline is equipped with a temperature sensor 1, which is located between the heat exchanger 1 and the ammonia stripping tower; and the return pipeline is equipped with a temperature sensor 2 downstream of the heat exchanger 2.

[0007] Preferably, the output pipeline has a circulation branch pipe between the outlet and the second heat exchanger. The circulation branch pipe is equipped with a flow meter and connected to the upper part of the ammonia stripping tower. The outlet of the circulation branch pipe is located below the upper outlet of the ammonia stripping tower.

[0008] Preferably, the ammonia stripping tower has a rectification section between the circulation branch pipe and the first sprayer, and the rectification section is equipped with packing or trays.

[0009] Preferably, a transfer pump 1 and a transfer pump 2 are respectively installed on the pipelines connected to the solution inlets of the two heat exchangers, heat exchanger 1 and heat exchanger 2.

[0010] Preferably, the ammonia stripping tower is equipped with a pressure sensor one and a pressure sensor two. The pressure sensor one is located at the upper part of the ammonia stripping tower above the rectification section, and the pressure sensor two is located in the middle and lower part of the ammonia stripping tower below the rectification section.

[0011] Preferably, the ammonia stripping tower is equipped with an agitator, and the second sprayer is located between the first sprayer and the agitator.

[0012] The advantages of this invention are as follows: the ammonia stripping process occurs entirely within the stripping tower, not in the heat exchanger, thus preventing scaling and clogging and ensuring heat exchange efficiency. The latent heat of the evaporated ammonia and water vapor, as well as the heat of solution of ammonia in water, are repeatedly recovered and utilized, significantly reducing system energy consumption. It efficiently recovers ammonia from metal ion ammonia solutions while simultaneously recovering and utilizing metal elements, and boasts advantages such as low energy consumption, strong anti-scaling ability, and simple operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the ammonia recovery and utilization device for metal ion ammonia solution according to the present invention.

[0014] The labels in the attached diagram include: 1 transfer pump one, 2 heat exchanger one, 3 ammonia stripping tower, 301 rectification section, 302 first sprayer, 303 second sprayer, 304 agitator, 4 jet pump, 5 solid-liquid separator, 6 transfer pump two, 7 heat exchanger two, 8 flow meter three, 9 flow meter one, 10 flow meter two, 11 pressure sensor one, 12 temperature sensor one, 13 pressure sensor two, 14 temperature sensor two. Detailed Implementation

[0015] The following detailed description of the embodiments, with reference to the accompanying drawings, will further illustrate the specific implementation of this utility model, in order to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of this utility model.

[0016] like Figure 1As shown, this utility model provides an ammonia stripping and recovery device for ammonia solution containing metal ions. It includes an input pipeline for conveying the ammonia solution containing metal ions, connected to the solution inlet of heat exchanger 2 and then to ammonia stripping tower 3, which is connected to a first sprayer 302 within the tower. The heating medium pipeline of heat exchanger 2 is connected to a first steam source. The upper outlet of the ammonia stripping tower 3 is connected to the suction inlet of a jet pump 4. The working medium inlet of the jet pump 4 is connected to a second steam source. The outlet of the jet pump 4 outputs ammonia solution. The bottom outlet of the ammonia stripping tower 3 is connected to a solid-liquid separator 5. The liquid outlet of the solid-liquid separator 5 is connected to a second sprayer 303 within the tower 3 via a return pipeline. The solid outlet of the solid-liquid separator 5 outputs solid product. The ammonia stripping process occurs entirely within the ammonia stripping tower 3, not within the heat exchanger, preventing scaling and clogging and ensuring heat exchange efficiency. The upper outlet of the ammonia stripping tower 3 is equipped with a jet pump 4. The input of water vapor can create a negative pressure at the top of the tower, which accelerates the evaporation of ammonia in the ammonia stripping tower 3 and achieves low-temperature ammonia stripping.

[0017] A second heat exchanger 7 is installed on the return pipeline. The solution inlet of the second heat exchanger 7 is connected to the liquid outlet of the solid-liquid separator 5. The outlet of the jet pump 4 is connected to the output pipeline. The output pipeline outputs ammonia water product after passing through the heating medium pipeline of the second heat exchanger 7. The return pipeline transports the solution after separating the solid product, and the output pipeline transports a mixture of ammonia gas and vapor output by the jet pump 4. After the solution is heated by the second heat exchanger 7, it is output from the outlet of the output pipeline. The mixed gas can be condensed into ammonia water for output in the second heat exchanger 7.

[0018] The first steam source and the second steam source are connected by a flow meter 9 and a flow meter 10, respectively, which are used to control the steam delivery volume of the two steam sources. A temperature sensor 12 is installed on the input pipeline between heat exchanger 2 and ammonia stripping tower 3. A temperature sensor 14 is installed downstream of heat exchanger 7 on the return pipeline. By detecting the solution temperature output from the two heat exchangers and controlling the steam delivery volume, the solution temperature output from the heat exchangers can be adjusted while keeping the corresponding solution delivery volume constant.

[0019] The output pipeline has a circulation branch pipe between the outlet and heat exchanger 7. The circulation branch pipe is equipped with a flow meter 8 and connected to the upper part of the ammonia stripping tower 3. The outlet of the circulation branch pipe is located below the upper outlet of the ammonia stripping tower 3. This allows the flow rate of ammonia water output from the output pipeline to be controlled through the circulation branch pipe, and excess ammonia water is returned to the upper part of the ammonia stripping tower 3 for circulation, ensuring the stability of the output of the recovered ammonia water.

[0020] The ammonia stripping tower 3 has a rectification section 301 between the circulation branch pipe and the first sprayer 302 to achieve the rectification of ammonia. The rectification section 301 is equipped with packing or trays, where the evaporated ammonia and water vapor are redistributed to increase the proportion of ammonia in the gas phase.

[0021] Pipelines connected to the solution inlets of heat exchangers 1 (2) and 2 (7) are respectively equipped with transfer pump 1 and transfer pump 2 (6). With stable steam supply from both steam sources, two temperature sensors detect the temperature of their corresponding solutions. Combined with the control of the transfer pumps' solution delivery rate, the temperature of the solutions output from the two heat exchangers can also be controlled, thereby controlling the spraying effect of the first sprayer 302 and the second sprayer 303. This solution can achieve the desired spraying effect for both the first sprayer 302 and the second sprayer 303.

[0022] The ammonia stripping tower 3 is equipped with pressure sensor 11 and pressure sensor 13. Pressure sensor 11 is located at the top of the ammonia stripping tower 3, above the rectification section 301, while pressure sensor 13 is located in the lower middle part of the ammonia stripping tower 3, below the rectification section 301. The former is used to detect the pressure at the top of the ammonia stripping tower 3 after the ejector pump 4 draws in the output gas, and the latter is used to detect the pressure in the lower middle part of the ammonia stripping tower 3 after the solution is sprayed. Due to the pressure reduction effect of the ejector pump 4, the lower middle part of the ammonia stripping tower 3 can perform depressurized spraying of the solution sprayed by the two atomizers, thereby improving the atomization effect of the solution.

[0023] The solid-liquid separator 5 can be a filter, centrifuge, hydrocyclone, or other equipment capable of solid-liquid separation. The appropriate equipment should be selected based on the physical properties of the solid product.

[0024] The ammonia stripping tower 3 is equipped with a stirrer 304, which can disperse the solid product and prevent large solid lumps from forming and clogging the tower. The second sprayer 303 is located between the first sprayer 302 and the stirrer 304.

[0025] In operation, the metal ion ammonia solution is pressurized by a transfer pump 1 and transported to a heat exchanger 2. In the heat exchanger 2, it is heated by steam from a first steam source, with the temperature monitored by a steam flow meter and a temperature sensor. The transfer pump controls the solution flow rate and outlet temperature simultaneously. The heated solution is then transported to the first sprayer 302 in the ammonia stripping tower 3 for depressurized spraying. During this process, some of the ammonia and water in the solution vaporize into gas and rise in the tower, while the remaining solution moves downwards with solid precipitation. The remaining solution is then transported to the solid-liquid separator 5 at the bottom of the tower. After the solid product is separated, the liquid outlet solution is pressurized by a transfer pump 6 and transported to a heat exchanger 7 for heating. It is then transported back to the second sprayer 303 in the ammonia stripping tower 3 for depressurized spraying, achieving the same effect as the depressurized spraying process described above. This process achieves both material evaporation and the recycling of unevaporated materials. Water vapor from the second steam source is input into the ejector pump 4, which serves as the working medium to create a negative pressure within the pump 4. This negative pressure, in turn, creates a negative pressure at the top of the connected ammonia stripping tower 3, accelerating the evaporation of ammonia in the tower and achieving low-temperature ammonia stripping. Under the action of the ejector pump 4, the pressure and temperature of the ammonia gas and water vapor exiting the tower are increased, which is then used to heat the heat exchanger 7 and condensed into ammonia water. Part of the ammonia water is returned to the top of the tower for reflux via a flow meter, while the remainder is output as product. This controls the flow rate of the output ammonia water, ensuring a stable product output speed.

[0026] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A device for recovering and utilizing ammonia from metal ion ammonia solutions, characterized in that: The system includes an input pipeline for conveying ammonia solution containing metal ions. The input pipeline is connected to the solution inlet of a heat exchanger and then to an ammonia stripping tower, which is connected to a first sprayer within the ammonia stripping tower. The heating medium pipeline of the heat exchanger is connected to a first steam source. The upper outlet of the ammonia stripping tower is connected to the suction inlet of a jet pump. The working medium inlet of the jet pump is connected to a second steam source. The outlet of the jet pump outputs ammonia solution. The bottom outlet of the ammonia stripping tower is connected to a solid-liquid separator. The liquid outlet of the solid-liquid separator is connected to a second sprayer within the ammonia stripping tower via a return pipeline. The solid outlet of the solid-liquid separator outputs solid solution.

2. The ammonia recovery and utilization device for metal ion ammonia solution according to claim 1, characterized in that: A second heat exchanger is installed on the return pipeline. The solution inlet of the second heat exchanger is connected to the liquid outlet of the solid-liquid separator. The outlet of the jet pump is connected to the output pipeline. The output pipeline outputs ammonia water product after passing through the heating medium pipeline of the second heat exchanger.

3. The ammonia recovery and utilization device for metal ion ammonia solution according to claim 2, characterized in that: The first steam source and the second steam source are respectively equipped with a flow meter 1 and a flow meter 2 on the conveying pipelines; the input pipeline is equipped with a temperature sensor 1, which is located between the heat exchanger 1 and the ammonia stripping tower; the return pipeline is equipped with a temperature sensor 2 downstream of the heat exchanger 2.

4. The ammonia recovery and utilization device for metal ion ammonia solution according to claim 3, characterized in that: The output pipeline has a circulation branch pipe between the outlet and the second heat exchanger. The circulation branch pipe is equipped with a flow meter and connected to the upper part of the ammonia stripping tower. The outlet of the circulation branch pipe is located below the upper outlet of the ammonia stripping tower.

5. The ammonia recovery and utilization device for metal ion ammonia solution according to claim 4, characterized in that: The ammonia stripping tower has a rectification section between the circulating branch pipe and the first sprayer, and the rectification section is equipped with packing or trays.

6. The ammonia recovery and utilization device for metal ion ammonia solution according to claim 5, characterized in that: Transfer pump 1 and transfer pump 2 are respectively installed on the pipelines connected to the solution inlets of heat exchanger 1 and heat exchanger 2.

7. The ammonia recovery and utilization device for metal ion ammonia solution according to claim 6, characterized in that: The ammonia stripping tower is equipped with pressure sensor one and pressure sensor two. Pressure sensor one is located at the top of the ammonia stripping tower, above the rectification section, while pressure sensor two is located in the middle and lower part of the ammonia stripping tower, below the rectification section.

8. The ammonia recovery and utilization device for metal ion ammonia solution according to claim 7, characterized in that: The ammonia stripping tower is equipped with an agitator, and the second sprayer is located between the first sprayer and the agitator.

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