Research On The Performance Of Open-Close Integrated Fire Hose Drying Device Based On Air Source Heat Pump

Firefighting work is directly related to the safety of people’s lives and property,and also related to the situation of economic development and social stability.According to the relevant regulations,fire officers and soldiers need to dry the fire hose after completing the firefighting work,but the existing method of drying have a poor quality,slow drying rate,bringing a long fire equipment maintenance cycle,high frequency of replacement,adding additional work pressure for fire officers and soldiers.At the same time,in view of the long preheating time of closed heat pump and the high defects of drying energy consumption of open heat pump,and taking into account the variability of drying methods,the uncertainty of ambient temperature and humidity,and the requirements of energy saving and emission reduction,this dissertation designs an open-closed integrated fire hose drying device based on air source heat pump,and the main work is as follows:（1）Design the open-closed integrated air source heat pump drying system with good environmental adaptability.The work including compressor selection,evaporator and condenser design and selection,fan selection,drying unit design and control system design is completed;this heat pump drying system can realize three working modes of auxiliary preheating,closed heat pump drying and open heat pump drying to meet different drying requirements.At the same time,the heat pump performance test is carried out,and the test results show that:when 40℃is the drying temperature,the test bench can reach the set value of air supply temperature under the open and closed heat pump drying mode,and keep the operation fluctuating in the range of（35℃,40℃）,which basically meets the drying demand.（2）Conduct experiments on the drying performance of fire hose based on heat pump device.The experimental results show that:in the closed heat pump drying mode,when the outdoor ambient temperature is within 15～35℃,the energy consumption of the closed-loop heat pump drying system decreases by 9.4%on average for every 5℃increase,and the SMER（specific moisture extraction rate）increases by 10.7%on average;in the open heat pump drying mode,when the outdoor ambient temperature is within 15～35℃,the energy consumption decreases by 23.5%on average and SMER increases by 44.1%on average for every 5℃increase;the relative humidity of outdoor air increases from 10%to 50%and SMER decreases by 6.5%.（3）Established the mathematical model of dry fire hose,and the heat pump preheating experiment is conducted at the same time.The experimental results show that:the preheating time and power consumption of the preheating stage system are inversely proportional to the external ambient temperature,and the preheating energy consumption and time decrease when the ambient temperature increases;using the auxiliary preheating mode can save75%～82%of preheating time and 60%～76%of preheating energy consumption compared with the closed preheating mode.Therefore,using auxiliary preheating mode will greatly improve the problem of long preheating time and large preheating energy consumption when the temperature of closed heat pump is low,and the lower the external ambient temperature,the better the improvement effect.（4）The simulation model of open-closed air source heat pump drying system was established by TRNSYS,and the simulation model established was applied to analyze and study the heat pump drying system,and the temperature demarcation zone of energy-saving operation under different ambient temperature and humidity conditions was obtained,and its accuracy was verified through experiments;in the year-round simulation,the energy-saving operation mode can save 2490 k Wh of electricity consumption per year compared with the closed heat pump drying mode,and 3938 k Wh of electricity consumption per year compared with the open heat pump drying mode.The results show that compared with electric drying,air source heat pump drying can save 1202.47 kg of standard coal,1286.64 kg of CO₂emission reduction,11.94 kg of SO₂emission reduction,7.77 kg of NO_X emission reduction,and 7.77 kg of soot emission reduction.7.77 kg,and 24.29 kg of soot emission reduction,with outstanding energy saving and carbon reduction benefits,achieving the purpose of environmental protection and green development.