Non-metallic evaporator apparatus for acid recovery concentration

Abstract

This utility model discloses a metal-free evaporator for anode acid recovery and concentration, comprising a fiberglass separation tank, a circulation loop, a vapor-liquid separator, a vacuum pump, a control cabinet, and a monitoring device. The equipment solves the problems of easy corrosion and potential acid contamination associated with traditional metal evaporators by using non-metallic materials and vacuum negative pressure low-temperature evaporation technology. All parts in contact with the acid are made of non-metallic materials, and the evaporation temperature is controlled below 90 degrees Celsius to ensure that the chemical composition of the acid is not damaged. This application achieves efficient acid dilution, uniform stirring, evaporation concentration, and high-concentration acid reuse, featuring corrosion resistance, pollution prevention, and automated operation, and is suitable for acid recovery and reuse in anodizing production.

Description

Technical Field

[0001] This utility model relates to the technical field of acid recovery and treatment in anodizing production, and in particular to a metal-free evaporator for acid recovery and concentration. Background Technology

[0002] In the anodizing process, phosphoric acid and sulfuric acid are indispensable chemical reagents. These acids typically require purification and recycling after use to achieve resource reuse and reduce environmental pollution. However, the acid purification process involves diluting with pure water before filtration, followed by evaporation and concentration to achieve a reuse standard. Traditional acid concentration equipment is often made of metal, but due to the highly corrosive nature of acids, metal equipment is easily corroded, shortening its lifespan and potentially causing metal ion contamination, affecting the quality of the reused acid. Therefore, developing an acid concentration device that avoids metal contamination and is corrosion-resistant is a pressing technical problem.

[0003] In existing technologies, acid evaporation and concentration are typically carried out at high temperatures. High temperatures can damage the chemical composition of the acid, affecting its subsequent performance. Furthermore, traditional equipment lacks effective temperature control during evaporation, resulting in high energy consumption and complex operation. Simultaneously, existing acid treatment systems often suffer from corrosion of equipment materials in contact with the acid during steam condensation, liquid separation, and recovery, further limiting system stability and reliability. To address these issues, there is an urgent need to design a non-metallic evaporator capable of efficiently concentrating acid at low temperatures, ensuring the chemical stability of the acid while avoiding metal ion contamination, thereby meeting the demand for high-quality acid recovery in anodizing production. Utility Model Content

[0004] The purpose of this invention is to provide a metal-free evaporator for acid recovery and concentration, so as to overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A metal-free evaporator for anode recovery acid concentration is disclosed. This equipment overcomes the technical shortcomings of traditional metal evaporators, such as susceptibility to corrosion and potential metal ion contamination during acid treatment, by employing non-metallic materials and vacuum negative pressure low-temperature evaporation technology. Furthermore, the equipment achieves efficient acid dilution, uniform stirring, evaporation concentration, and high-concentration acid reuse.

[0006] This utility model provides a metal-free evaporator for anode recovery acid concentration, including a fiberglass separation tank, a circulation loop, a vapor-water separator, a vacuum pump, a control cabinet, and a monitoring device. Wherein: The fiberglass separation tank, as the core component of the equipment, is used for the dilution, circulation, stirring, and evaporation concentration of the acid solution. The tank body is made of fiberglass and lined with PTFE material, providing excellent corrosion resistance. A non-metallic evaporator, composed of multiple PTFE tubes, is installed inside the tank. The heating medium flows through these tubes to achieve the evaporation and concentration of the acid solution. During the evaporation process, the temperature of the acid solution inside the tank is maintained below 90 degrees Celsius to prevent damage to the chemical composition of the acid solution from high temperatures.

[0007] Furthermore, the circulation loop is connected via pipelines to a fiberglass separation tank, a purified acid tank, and a gas-water separator. A circulation pump is installed in the circulation loop to thoroughly mix and circulate the pure water with the acid to be purified, ensuring uniform dilution and stirring of the acid solution. Specifically, the circulation loop also has a branch line that uses a discharge and recovery pump to discharge the high-concentration acid solution after evaporation and concentration and return it to a recovery tank.

[0008] The vapor-water separator is connected to a cooling tower and a PPH vapor separator via pipelines to condense the vapor generated during evaporation into liquid. The cooled solution enters the PPH vapor separator, and the outlet of the PPH vapor separator is connected to a condensate pump via pipelines to discharge the condensate to an external transfer tank or wastewater treatment plant. The vapor-water separator includes a condenser, the outer shell of which is made of PPH material, and the interior uses PVDF membrane tubing to ensure that there are no metal materials in contact with the acid solution.

[0009] Furthermore, the vacuum pump is connected to the fiberglass separation tank via a pipeline, providing a negative pressure environment inside the tank to achieve low-temperature evaporation and concentration. This negative pressure environment allows the acid solution to be evaporated and concentrated at temperatures below 90 degrees Celsius, further protecting the chemical properties of the acid solution from the effects of high temperatures. The vacuum pump adjusts the negative pressure value to ensure that the evaporation process takes place within a set temperature range.

[0010] The control cabinet is used to control the start and stop of various pumps (such as circulating pumps, acid recovery pumps, and condensate discharge pumps), heating components, and cooling components in the equipment, achieving automated operation. The control cabinet is connected to monitoring devices such as negative pressure gauges, level gauges, and thermometers to monitor the equipment's operating status in real time. The control cabinet uses preset programs to achieve coordinated control of various components, ensuring the stability and reliability of the equipment's operation.

[0011] Furthermore, the monitoring device includes a negative pressure gauge, a level gauge, and a thermometer. The negative pressure gauge is installed on the fiberglass separation tank to monitor the pressure inside the tank, ensuring that the evaporation process takes place under negative pressure. The level gauge measures the liquid level inside the tank to prevent overflow or under-leveling. The thermometer is installed on the upper side of the tank to monitor the temperature inside, ensuring that the evaporation and concentration process is carried out below 90 degrees Celsius. The probes of all monitoring devices are lined with PTFE to prevent corrosion or contamination upon contact with acid.

[0012] Specifically, all parts of the equipment that come into contact with the acid are made of non-metallic materials. Specifically, all piping is made of PPH material, the heating element uses PTFE tubing for steam transmission, the separation chamber is a fiberglass tank lined with PTFE, the condenser shell is made of PPH material with PVDF membrane tubing inside, other tanks are made of PP material, valves are made of PPH material, and the pump body is stainless steel lined with PTFE. The selection of these non-metallic materials ensures that the acid is not contaminated by metal ions, while also improving the equipment's corrosion resistance.

[0013] The working principle of this utility model is as follows: S1: The acid to be purified is transported from the purified acid tank to the fiberglass separation tank through a pipeline. At the same time, the cooling tower injects pure water into the tank through a pipeline to dilute the acid to be purified.

[0014] S2: After the circulation pump starts, the diluted acid solution will be fully circulated and stirred to ensure even distribution.

[0015] S3: Inside the fiberglass separation tank, a non-metallic evaporator uses a PTFE tube to circulate the heating medium, evaporating the diluted acid solution. Due to the negative pressure environment provided by the vacuum pump, the evaporation process is carried out below 90 degrees Celsius, preventing high temperatures from damaging the chemical composition of the acid solution.

[0016] S4: The steam generated by evaporation enters the steam-water separator through a pipeline, where it is liquefied into water by the condenser and flows into the PPH steam separator tank. The condensate pump discharges the condensate to an external transfer tank or wastewater treatment plant.

[0017] S5: The high-concentration acid solution after evaporation and concentration is discharged through a branch of the circulation loop, and the acid recovery pump transports it to the recovery tank to meet the reuse standard.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: By employing non-metallic materials in its design, all parts in contact with the acid solution are metal-free, preventing corrosion of the equipment and eliminating the risk of metal ion contamination. Furthermore, the negative pressure environment provided by the vacuum pump enables low-temperature evaporation and concentration of the acid solution, maintaining the evaporation temperature below 90 degrees Celsius, effectively protecting the chemical composition of the acid. In addition, the equipment's circulation loop and branch circuit design achieve thorough dilution, uniform stirring, and efficient concentration of the acid solution, ultimately yielding a high-concentration acid solution that meets reuse standards. The control cabinet integrates automation functions, enabling real-time monitoring of equipment operation and automatically starting and stopping pumps and heating / cooling components as needed, improving operational convenience and equipment efficiency.

[0019] In summary, this utility model provides a high-efficiency, safe, and environmentally friendly metal-free evaporator for anode acid recovery and concentration, which is suitable for acid recovery and reuse in anodizing production and has significant industrial application value. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is the front view of the present utility model; Figure 3 This is a top view of the present invention; Figure 4 This is a flowchart of the present invention.

[0021] Attached diagram labels: 1. Fiberglass separator; 2. PTFE tubing; 3. Circulation pump; 4. Negative pressure gauge; 5. Vacuum pump; 6. Acid discharge pump; 7. Condensate discharge pump; 8. Level gauge; 9. PPH vapor separator; 10. Thermometer; 11. Steam-water separator; 12. Control cabinet; 13. Cooling tower. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings: This utility model provides a metal-free evaporator device for anode recovery acid concentration, combined with attached... Figure 1 To be continued Figure 4 The structure and operating principle of the equipment are described in detail. The equipment includes a fiberglass separation tank 1, a circulation loop, a gas-water separator 11, a vacuum pump 5, a control cabinet 12, and monitoring devices. All components shown in the attached drawings are designed with non-metallic materials to ensure that parts in contact with the acid solution will not introduce metal ion contamination. The following description, in conjunction with the attached drawings and specific embodiments, will describe the operation process and technical details of the equipment.

[0023] The core component of the equipment is the fiberglass separation tank 1, which is made of fiberglass and lined with PTFE, providing excellent corrosion resistance. Inside the fiberglass separation tank 1 is a non-metallic evaporator, composed of multiple PTFE tubing tubes 2. Heating media, such as high-temperature steam or heat transfer oil, circulates within the PTFE tubing tubes 2 to heat and evaporate the acid solution. In practical applications, the PTFE tubing tubes 2 are connected to an external heating system via pipelines, and the temperature and flow rate of the heating medium can be adjusted via control cabinet 12. During the heating process, the acid solution temperature inside the fiberglass separation tank 1 is consistently maintained below 90 degrees Celsius to prevent high temperatures from damaging the chemical composition of the acid. A thermometer 10 is installed on the upper side of the fiberglass separation tank 1 to monitor the internal temperature in real time and feed the data back to control cabinet 12. Control cabinet 12 automatically adjusts the input of the heating medium based on the temperature data to ensure that the evaporation process remains at a low temperature.

[0024] The circulation loop connects the fiberglass separation tank 1, the purified acid tank, and the gas-water separator 11 via pipelines. A circulation pump 3 is installed in the circulation loop to thoroughly mix and circulate pure water with the acid to be purified. The acid to be purified enters the fiberglass separation tank 1 from the purified acid tank through pipelines, while the cooling tower 13 injects pure water into the tank through pipelines to dilute the acid. After the circulation pump 3 starts, the diluted acid solution circulates within the fiberglass separation tank 1, ensuring uniform distribution and thorough mixing. The circulation loop also has a branch line, through which a discharge and recovery pump 6 discharges the high-concentration acid solution after evaporation and concentration and recovers it to a recovery tank. The power source for the discharge and recovery pump 6 is controlled by the control cabinet 12. When the level gauge 8 detects that the acid solution in the fiberglass separation tank 1 has reached the set height, the control cabinet 12 starts the discharge and recovery pump 6 to discharge the high-concentration acid solution.

[0025] The steam-water separator 11 is connected to the cooling tower 13 and the PPH steam separator 9 via pipelines, and is used to condense the steam generated by evaporation into liquid. The cooling tower 13 is filled with pure water and supplies water to the steam-water separator 11 through pipelines. The cooling water passes through the condenser inside the steam-water separator 11 to condense the steam into liquid. The condenser shell is made of PPH material, and the interior uses PVDF membrane tubes to ensure that there are no metal materials in contact with the acid solution. The condensed solution enters the PPH steam separator 9. The outlet of the PPH steam separator 9 is connected to the condensate drain pump 7 through a pipeline to discharge the condensate to an external transfer tank or sewage treatment plant. The start and stop of the condensate drain pump 7 are controlled by the control cabinet 12. When the level gauge 8 detects that the liquid in the PPH steam separator 9 has reached the set height, the control cabinet 12 starts the condensate drain pump 7 to discharge the condensate.

[0026] Vacuum pump 5 is connected to fiberglass separation tank 1 via pipeline, providing a negative pressure environment inside the tank to achieve low-temperature evaporation and concentration. The operation of vacuum pump 5 is controlled by control cabinet 12, and negative pressure gauge 4 is installed on fiberglass separation tank 1 to monitor the pressure inside the tank in real time. When the negative pressure value deviates from the set range, control cabinet 12 automatically adjusts the operating status of vacuum pump 5 to ensure that the pressure inside the tank is maintained within the set range. The negative pressure environment allows the acid solution to be evaporated and concentrated at temperatures below 90 degrees Celsius, further protecting the chemical properties of the acid solution from the effects of high temperatures.

[0027] Control cabinet 12 integrates automation functions, enabling real-time monitoring of equipment operation and automatic start / stop of pumps and heating / cooling components as needed. Control cabinet 12 connects to monitoring devices such as negative pressure gauge 4, level gauge 8, and thermometer 10 to collect real-time equipment operation data. For example, when thermometer 10 detects that the temperature inside the fiberglass separation tank 1 exceeds 90 degrees Celsius, control cabinet 12 automatically reduces the input of the heating medium; when level gauge 8 detects that the liquid level in the tank is too low, control cabinet 12 starts circulating pump 3 to replenish acid; when negative pressure gauge 4 detects insufficient pressure inside the tank, control cabinet 12 starts vacuum pump 5 to increase the negative pressure. Control cabinet 12 achieves coordinated control of various components through preset programs, ensuring the stability and reliability of equipment operation.

[0028] The monitoring device includes a negative pressure gauge 4, a level gauge 8, and a thermometer 10, used to monitor the pressure, liquid level, and temperature inside the fiberglass separation tank 1, respectively. The negative pressure gauge 4 is installed on the fiberglass separation tank 1 to monitor the internal pressure in real time, ensuring the evaporation process takes place under negative pressure. The level gauge 8 measures the liquid level inside the tank to prevent overflow or under-leveling. The thermometer 10 is installed on the upper side of the tank to monitor the internal temperature, ensuring the evaporation and concentration process is carried out below 90 degrees Celsius. All probes of the monitoring device are lined with PTFE to prevent corrosion or contamination upon contact with acid.

[0029] All parts of the equipment that come into contact with the acid are made of non-metallic materials. Specifically, all piping is made of PPH material, the heating tubes are PTFE tubing with two steam inlets, the separation chamber is a fiberglass tank lined with PTFE, the condenser shell is made of PPH material with PVDF membrane tubing inside, other tanks are made of PP material, valves are made of PPH material, and the pump body is stainless steel lined with PTFE. The choice of non-metallic materials ensures that the acid is not contaminated by metal ions, while also improving the equipment's corrosion resistance.

[0030] The equipment operates as follows: First, the acid to be purified is transported from the purification tank to the fiberglass separation tank 1 via pipeline. Simultaneously, the cooling tower 13 injects pure water into the tank through pipeline to dilute the acid. Second, after the circulation pump 3 starts, the diluted acid solution is thoroughly circulated and stirred to ensure uniform distribution. Next, inside the fiberglass separation tank 1, a non-metallic evaporator uses a PTFE tube 2 to circulate the heating medium, heating and evaporating the diluted acid solution. Due to the negative pressure environment provided by the vacuum pump 5, the evaporation process is carried out below 90 degrees Celsius, avoiding damage to the chemical composition of the acid solution from high temperatures. Subsequently, the steam generated by evaporation enters the steam-water separator 11 through pipeline, liquefies into water under the action of the condenser, and flows into the PPH steam separation tank 9. The condensate discharge pump 7 discharges the condensate to an external transfer tank or wastewater treatment plant. Finally, the high-concentration acid solution after evaporation and concentration is discharged through a branch of the circulation loop, and the acid recovery pump 6 transports it to the recovery tank, meeting the reuse standard.

[0031] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A metal-free evaporator for acid recovery and concentration, characterized in that: The system includes a fiberglass separation tank (1), a circulation loop, a steam-water separator (11), a vacuum pump (5), a control cabinet (12), and a monitoring device. The fiberglass separation tank (1) is equipped with a non-metallic evaporator, which is composed of multiple PTFE wool tubes (2). The circulation loop is connected to the fiberglass separation tank (1), the purified acid tank, and the steam-water separator (11) through a pipeline. The steam-water separator (11) is connected to the cooling tower (13) and the PPH steam separator (9) through a pipeline. The vacuum pump (5) is connected to the fiberglass separation tank (1) through a pipeline.

2. The metal-free evaporator equipment for acid recovery and concentration as described in claim 1, characterized in that: The fiberglass separation tank (1) is made of fiberglass and lined with PTFE material. The PTFE woolen tube (2) inside the fiberglass separation tank is used to circulate the heating medium to ensure that the temperature of the acid solution is maintained below 90 degrees Celsius during the evaporation process.

3. The metal-free evaporator equipment for acid recovery and concentration as described in claim 2, characterized in that: The circulation loop is equipped with a circulation pump (3), which is used to fully mix pure water with the acid to be purified and circulate it. The circulation loop is also equipped with a branch, through which the high-concentration acid solution after evaporation and concentration is discharged by the acid discharge pump (6).

4. The metal-free evaporator equipment for acid recovery and concentration as described in claim 1, characterized in that: The steam-water separator (11) includes a condenser. The outer shell of the condenser is made of PPH material, and the inside is made of PVDF membrane tube. The condenser condenses the steam generated by evaporation into liquid through a pipeline and then flows into the PPH steam separator (9).

5. The metal-free evaporator equipment for acid recovery and concentration as described in claim 4, characterized in that: The outlet of the PPH vapor separator (9) is connected to a condensate drain pump (7) via a pipeline. The condensate drain pump (7) is used to discharge the condensate to an external transfer tank or sewage station.

6. The metal-free evaporator equipment for acid recovery and concentration as described in claim 1, characterized in that: The vacuum pump (5) provides a negative pressure environment for the fiberglass separation tank (1) and monitors the pressure inside the tank in real time through the negative pressure gauge (4), which is installed on the fiberglass separation tank (1).

7. The metal-free evaporator equipment for acid recovery and concentration as described in claim 1, characterized in that: The monitoring device includes a level gauge (8) and a thermometer (10). The level gauge (8) is used to measure the liquid level in the fiberglass separation tank (1), and the thermometer (10) is installed on the upper side of the tank to monitor the temperature inside the tank.

8. The metal-free evaporator equipment for acid recovery and concentration as described in claim 1, characterized in that: All parts in contact with the acid are made of non-metallic materials, including PPH pipes, a fiberglass tank lined with PTFE for the separation chamber, PPH valves, and a stainless steel pump body lined with PTFE.

Images