The Theoretical Analysis And Experimental Research Of Heat Pump Dryer For Fireworks Drying

In this paper, the main task is to design a kind of heat pump drying system for fireworks. Must be strictly with reference to the GB11652-89 In the design process. Considering energy-saving, determine the heat pump drying system for the closed loop system. Determine the dehumidification capacity by the desiccant standard required. Calculation and selection of heat pump main parts include compressor, evaporator, condenser, thermal expansion valve. In the condenser and evaporator side is equipped with auxiliary heater to prevent the extreme winter weather insufficient heat pump heat defrosting and evaporator. Selection for air duct and ventilator of explosion-proof by calculate the air output per hour. Filter dust removal device is equipped in air duct. System with sensible heat exchanger to take advantage of the quantity of return air. Temperature sensors is equipped in the drying room. To ensure the safety of the drying process, when the temperature more than 58 ℃, the heat pump stop running. Design of drying room air distribution and using Fluent software for simulation analysis. Floor air supply and orifice plate return air at the top are most reasonable. By the experimental data analysis of heat pump drying dehumidifying performance. The experimental results show, dry basically completed by 24 h SPC of heat pump drying system is 1.13kWh/kg(water), lower than the steam moisture(1.2~1.8kWh/kg(water)). But the advantages are not obvious. Due to the dry to 21 hours, material moisture has basically meet the requirements of drying, less moisture in the material, most of refrigerating capacity used for cooling air, and less to dehumidification, the SPC average is higher. Can stop the operation of heat pump in late and use the heat of return air. Can effectively improve the heat recovery.