A flammable and explosive gas refrigerated dryer is a specialized gas treatment device designed for hazardous gases such as biogas, natural gas, and hydrogen. It employs explosion-proof electrical structures and the principle of refrigeration dehumidification to remove moisture from the gas by cooling and condensing it.

Materials, Process, and Adaptability

Corrosion?resistant materials: The evaporator, condenser, and piping shall preferentially adopt 316L stainless steel or be lined with anti?corrosion coatings to resist attack from corrosive components such as hydrogen sulfide (H?S) and methane.

Anti?icing design: For low?dew?point requirements, an ethylene glycol antifreeze injection system may be configured, or a minimum outlet temperature threshold may be set, to prevent condensate from freezing and blocking the flow passages.

Refrigerant selection: Preference shall be given to non?flammable or low?toxicity, environmentally friendly refrigerants (e.g., R404A, R134a). The use of flammable refrigerants (e.g., R290) shall be avoided unless the system is a fully sealed explosion?proof circuit.

Core Applicable Scenarios

Industry sectors: Petroleum refining, natural gas transmission, biogas power generation/purification, coal chemical industry (coke oven gas, blast furnace gas, converter gas), chemical synthesis gas processing, and explosion?proof painting and coating workshops.

Gas types: Flammable and explosive media such as methane (biogas/natural gas), hydrogen, coalbed methane, coke oven gas, and compressed air containing organic solvent vapors.

Process requirements: Preventing pipeline condensation corrosion or ice blockage, protecting downstream membrane separation / PSA purification units, and meeting the drying needs of pneumatic tools in hazardous areas (non?deep drying).

Critical prerequisites: The equipment must hold a complete?machine explosion?proof certificate; all electrical components (motors, control cabinets, junction boxes) must comply with GB 3836 standards; the evaporator material must be corrosion?resistant (e.g., 316L stainless steel); and the refrigeration system must be designed to prevent leaks.