Selection of Solvent Recovery Equipment for the Enamel Gold Jewelry Industry
I. Key Components of the Device
A complete solvent recovery device typically includes:
Exhaust gas collection system: exhaust hood, air duct, regulating valve.
Pre-treatment system: paint mist filter, dust filter.
Adsorption system: activated carbon adsorption box (usually double or multiple boxes are adopted, one for adsorption and the other for desorption to ensure continuous operation), fan, valve.
Desorption system: Steam generator, steam pipeline, heat exchanger.
Condensation recovery system: Condenser (tubular, spiral plate type), condensate water tank, refrigeration unit (if low-temperature condensation is required).
Separation storage system: oil-water separator, solvent storage tank, metering pump.
Automatic control system: PLC control cabinet, touch screen, temperature/concentration sensors, pneumatic valves, to achieve fully automatic operation.
II. Selection and Implementation Suggestions (for Enamel Gold Jewelry Enterprises)
Preliminary assessment:
Determine air volume and concentration: Measure or estimate the total air volume (m³/h) of the waste gas to be treated and the initial concentration of the solvent (mg/m³). This is the core basis for equipment selection.
Clarify the solvent composition: Understand the type and properties of the solvent used (boiling point, whether it is miscible with water), as this determines the details of the recovery process and the separation method.
Equipment selection considerations:
Scale matching: Select small, medium or large-scale equipment based on usage. Small businesses can start with single-unit devices.
Material requirements: As the key components may come into contact with corrosive solvents or vapors, they should be made of corrosion-resistant materials such as stainless steel (e.g. 304, 316L).
Safety design: The device must comply with explosion-proof standards (Ex d), with explosion-proof electrical components, and be equipped with explosion relief ports, flame arrestors, concentration alarm devices, etc.
Energy efficiency and automation: Choose systems with waste heat recovery and automatic switching functions to reduce operational energy consumption and labor costs.
Manufacturer selection:
Look for environmental protection equipment companies that have successful cases in treating waste gas from the painting, spraying and chemical industries.
Detailed process plans, equipment lists, layout diagrams and after-sales service commitments are required to be provided.
Installation and Operation:
Rational layout: The equipment should be placed close to the gas production point, and the pipeline design should minimize resistance.
Professional operation and maintenance: Train dedicated personnel to be responsible for daily inspections (checking pressure, temperature, and liquid level), regular replacement of filters, and detection of the adsorption efficiency of activated carbon.
Waste treatment: The wastewater and waste activated carbon generated during the process should be separated and handed over to qualified units for treatment in accordance with the regulations on the management of hazardous waste.
