The company has been engaged in the chemical and plastic equipment industry for many years. It boasts 3 to 5 engineering and technical personnel and more than 30 production technicians. The company specializes in the fabrication and processing of plastic components and sheet materials, with an annual output reaching 800 to 1,000 tons. It enjoys a solid reputation within China’s environmental protection and chemical-plastic manufacturing and processing sectors. The company has established long-term, friendly cooperative relationships with numerous large-scale chemical and metallurgical enterprises. Cooperation models include contract processing with supplied materials, turnkey contracts covering both labor and materials, and on-site fabrication and processing services.

I. Equipment Overview

　　The SJT-type acid mist purification device is a highly efficient, energy-saving, and practical environmental protection equipment that our factory has developed over many years through continuous improvement and innovation. It is suitable for pickling processes involving various materials and can effectively remove water-soluble gases generated during these processes, including acid mist (H2SO4), hydrogen chloride (HCl) gas, hydrogen fluoride (HF) gas, chromic acid mist (CrO3), hydrogen cyanide (HCN) gas, hydrogen sulfide (H2S), ammonia (NH3), and alkaline vapor—achieving a purification efficiency of over 95%.

　　According to your company, the main components of the exhaust gas generated from the sintering of coated sand are dust particles. However, these dust particles also contain gases such as carbon monoxide, carbon dioxide, small amounts of sulfur dioxide, hydrogen, nitrogen oxides, and some formaldehyde. Our company employs a three-stage water-membrane dust removal system, followed by neutralization treatment using an industrial eco-friendly plant additive sprayed with water. Finally, the exhaust gas is further treated through an activated carbon adsorption unit. The entire casing is made of polypropylene. The main unit is equipped with pressure distribution pipes, perforated disc-type sprayers, and a packing layer, ensuring thorough gas-liquid contact. As a result, the purified exhaust gas significantly meets national emission standards. Moreover, the equipment is easy to operate, convenient for installation and maintenance, highly durable, long-lasting, and occupies a small footprint. It is currently an ideal device for the purification and neutralization of exhaust gases containing dust particles along with carbon monoxide, carbon dioxide, sulfur dioxide, hydrogen, nitrogen oxides, and formaldehyde. The treated exhaust gas complies with the "Comprehensive Emission Standard for Air Pollutants (GB16297-1996)."

II. Structure

　　The complete purification system consists of a square water-membrane tower, a circular neutralization tower, and a square activated carbon unit, all connected in a continuous, cyclic process. The equipment is entirely made of polypropylene material and is fabricated in sections with flanged connections. The specific structure comprises an air-inlet section, a water-membrane liquid storage tank, a primary spray section, a swirl plate, an activated carbon unit, and a chimney. This equipment boasts advantages such as high efficiency, strong corrosion resistance, high strength, low noise, energy savings, compact size, easy disassembly, maintenance, and repair, as well as being lightweight, durable, and aesthetically pleasing.

III. Working Principle and Process Flow

　　The front end of the equipment employs a three-stage water film system to progressively remove dust particles. The water film washes away the dust as it comes into contact with the exhaust gas. The exhaust gas is then forced by a fan into the inner cylinder of the neutralization tower, creating a pressure chamber. From this pressure chamber, the neutralizing liquid is evenly distributed through each spray nozzle, allowing the exhaust gas to come into full contact with the liquid. The gas then flows upward, passing through the filter media layer where it reacts with the neutralizing liquid sprayed from the nozzles. After absorption, the exhaust gas continues to flow backward toward the activated carbon unit, where it undergoes another adsorption process before being discharged into the atmosphere via the exhaust stack.

IV. Installation and Usage Precautions

1. This equipment should be installed on a concrete foundation that is at least 100 mm above the ground level; the pump and fan, respectively, should have their own concrete foundations as required.

2. During lifting, transportation, and installation, care must be taken to protect the equipment; do not allow any damage to the equipment’s outer casing or components.

3. Before starting the equipment, check the rotation direction of the fan, the (condenser cooling water), the spray system, and the sealing condition of each component. Only after confirming that all conditions are normal can you start the equipment.

4. Other accessories, such as plastic pipe fittings, valves, fixed supports, inspection ladders, etc., can be customized by the user when placing an order.

5. The water in the water film tower and the solution in the neutralization tower must be treated regularly (approximately every 15 working days). The aqueous solutions must be properly treated before being discharged to prevent secondary contamination.

6. The activated carbon in the activated carbon unit must have its moisture content checked periodically. Depending on the situation, it should be replaced approximately every 90 working days. The used, old activated carbon after replacement must be stored separately to prevent secondary contamination. Whenever possible, assign a dedicated person to manage it exclusively.

7. Before starting the circulating water pump and the fan each day, check whether they are operating normally. First, turn on the circulating water pump, and only after confirming it’s working properly should you then start the fan.