MTG Process Hazard Consequence Model Improvement And Foam Fire Resistance Adaptability Study

Methanol gasoline (MTG) technology has received extensive attention because of its advantages such as good product quality, high economic benefit and environmental protection, but its inherent risk characteristics limit its development.The paper studies the leakage, fire and explosion and other hazards of MTG process and device, simulates the consequences of the accidents. Process simulations theoretically improve leakage, liquid pool, evaporation and diffusion models, jet fire model, vapor cloud explosion shock wave overpressure and thermal radiation model, storage tank chemical explosion and physical explosion model, model of pool fire; BLEVE (boiling liquid expanding vapor cloud explosion) model and debris impact model. Through the simulations, the improved models are of great significance to assess the consequences of the accidents and guide the designs of fire protection.On the basis of simulating the damages of the accidents, this paper discusses the defects of air foam fire, puts forward the process of using nitrogen gas foam in large storage tanks and plant area and preliminary designs nitrogen foam fire extinguishing system and nitrogen foam spray fire extinguishing system. Then, a combination design of fire protection system in MTG factory is started, including air separation nitrogen, nitrogen flow in the tube, the MTG nitrogen bubble foam fire extinguishing system design, LPG spherical tank nitrogen foam spray fire extinguishing device, cooling water system of fire fighting in whole plant. Then, the detailed designs and hydraulic calculations of the foam fire system, fire cooling water system design and hydraulic calculation are all carried out. Finally, the accident drainage system and fire alarm system are designed.The fire designs are informed that the nitrogen foam extinguishing system and the nitrogen foam spraying extinguishing system have the theoretical feasibility and safety on large storage tanks. For the entire plant, the use of air separation for nitrogen could provide nitrogen continuously. The nitrogen can meet the needs of fire. This paper designs different combinations of fire, offers a variety of design choices for factory fire, ensuring economic and safe simultaneously.