I have a liquid that needs to evaporate; which type of evaporation equipment should I choose?
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I have a liquid that needs to evaporate; which type of evaporation equipment should I choose? The liquid is cleaning water for stainless steel parts treated with concentrated sulfuric acid, with a concentration of around 10%-1%. An alkaline treatment is not desired at the later stage due to the presence of other substances, as it would increase the processing costs. Now, an approach to consider is to collect this wastewater from the initial processing stage, concentrate it by evaporating the water contained within, thereby turning it back into concentrated sulfuric acid solution (a concentration of 50% is sufficient), which can then be reused in the initial processing process. By doing so, the costs associated with wastewater treatment are reduced, and energy savings are also achieved. The question now is: for such cleaning wastewater based on sulfuric acid (10%-1%, basically just water, like tap water), if the water is to be evaporated, what type of evaporation equipment would be suitable?
Considering the volume to be processed, if it’s less than 1 cubic meter per day, a glass container with a few heating elements will suffice. For large processing volumes, multi-effect evaporation or MVR can be used, and acid-resistant equipment should be selected
Heat is generated using electricity or natural gas; there is no steam source available at the moment. The material can be chosen by the supplier, as there are both concentrated sulfuric acid and dilute sulfuric acid available.
Honestly, it’s not economical to make it such a low concentration; if concentration is really necessary, an 8-meter column can be used on the reactor along with vacuum distillation at -0.05 MPa and electric heating
The air circulation-enhanced evaporation process is a completely new evaporation technology. It utilizes the principle that as the temperature rises, water molecules gain more kinetic energy, which increases their rate of diffusion into the moist air as well as the moisture-carrying capacity of the hot air. In this process, high-temperature waste liquid comes into direct contact with air inside the evaporation chamber; the air heats up and absorbs moisture, carrying away a large amount of water vapor to achieve evaporation. The system utilizes a dehumidification regenerator to recover the substantial amount of waste heat present in the hot, humid air, thereby reducing the system’s energy consumption. At the same time, it condenses the large amount of moisture in the air; the resulting condensed water is recovered and reused as water for washing or in boilers, which helps to significantly reduce water consumption. (1) The operation of this device is based on the process of absorbing and humidifying air; its system design is simple and easy to operate. There is only one evaporation chamber inside the system, resulting in low floor space requirements. (2) The system can operate under normal temperature and pressure, and since it contains no critical moving components, its operation is more stable with a longer lifespan. The requirements for equipment manufacturing are low, the initial investment cost is relatively low, and the equipment is easy to install and maintain. (3) The large amount of waste heat in humid air is recovered through a condensation regenerator, reducing the system’s energy consumption; at the same time, the large volume of condensate water generated is recovered, thereby decreasing the consumption of condensate water. Comparison with other evaporation technologies (1) Comparison with the multi-effect evaporation process: Since the multi-effect evaporation technology requires multiple evaporators, as well as corresponding steam generation and condensation equipment, it results in a complex system, large equipment size, significant floor space requirements, and high initial investment costs. This evaporation process requires only an evaporation chamber and a condensation chamber; it has a simple process flow, occupies less space for equipment, and results in low initial investment costs. The system can operate at normal temperature and pressure; it does not require any additional pressure reduction equipment, has relatively low requirements for manufacturing, and is easy to maintain over time.
You're on the right track. The question is whether this concentrated version can be reused; it would be best if it could, as that would give it the highest value
The issue is that I only provide ideas; whether you can use them depends on you. I don’t know what your metrics are.
Currently, in the market, materials resistant to corrosion include graphite and plastic evaporators; other materials such as tantalum, titanium, and glass are not only expensive but also not particularly effective