YY(Q)W Series Thermal Oil Fluid Boiler YY(Q)W series thermal oil fluid boiler adopts horizontal chamber combustion three-coil structure, and its body is composed of outer coil, middle coil，inner coil and rear coil. USES: oil chemical industry/chemical fiber industry/wood processing/paper making/building materials/food industry, etc. Core Technology: 1. Oil cover fire structure with three pass 2. Wet back structure 3. Compact coil tube 4. Over oil temperature/over smoke temperature/low flow alarm 5. Liquid level protection and flameout protection 6. Front and rear big open door design 7. Design with air preheater or heat recovery boiler