Research On Heating Technology Of Flue Gas Absorption Heat Pump Based On Biomass Combustion

With the depletion of fossil fuels,countries are actively seeking new ways to clean heating and vigorously promote heating methods using renewable energy as fuel.Biomass energy has rapidly entered the public's field of vision due to its rich resources,low pollution and renewable advantages,and has become an important heating option for many countries.Based on biomass fuel combustion,a clean heating method with rational utilization of biomass energy is proposed.The main research contents are as follows:First,the current status and existing policies of the three methods of using biomass energy for heating(biomass pellet fuel direct-fired heating,biogas heating,and domestic waste incineration heating)are analyzed,and the theoretical applicability is derived.It is concluded that Biomass briquettes combustion heating has more advantages in resource conditions,heating stability and environmental protection in northern areas,and there is a large amount of recoverable waste heat in the flue gas after fuel combustion,the dust in the flue gas and the exhaust temperature are the main factors that affect the recovery efficiency of waste heat.A spray waste heat recovery system suitable for biomass flue gas was established to provide heat source for the flue gas absorption heat pump heating system.Secondly,the process parameter analysis method is used to perform thermal calculations on the 20 MW absorption heat pump in the actual engineering background while deriving the mathematical relationship between the working fluid and the equipment,and the mathematical calculation model of the energy consumption of the absorption heat pump is written.The calculation program proposes a new method suitable for the thermal calculation of the heat pump.The thermal results calculated by the two methods are compared to verify the feasibility of the mathematical model of energy consumption.By establishing the communication interface between Matlab modeling software and Trnsys energy consumption simulation software,the problem of lack of absorption heat pump module in Trnsys was solved,and a simulation platform for the heating system of flue gas absorption heat pump was set up for instantaneous simulation calculation and analysis.According to the simulation results,it is concluded that the simulation system can meet the heating demand of residents for room temperature,and the hourly heat supply can also meet the hourly heat load of the entire building,which illustrates the reliability of the heating system.Finally,in order to improve the efficiency and heating area of the heating system the operating data of the system under different operating conditions was analyzed again.It is found that in the absorption heat pump system,the performance coefficient of the heat pump increases when the inlet temperature of the low-temperature heat source increases,the inlet temperature of the heating network decreases,and the driving heat source temperature increases.On the contrary,the performance coefficient decreases.The optimal operating conditions of the flue gas absorption heat pump heat pump heating system are summarized and can be used to guide the actual operation.By analyzing the economics of the heating system through the dynamic investment payback period method and annual cost method,the heat pump system can increase the heating heat by 3.59 million yuan per year and save 520,000 yuan in coal.The dynamic recovery is 4.47 years.Compared with other traditional heating methods(gas boilers,electric boilers,coal-fired boilers,etc.)and calculated the system pollutant emission reduction.The practice has proved that the flue gas absorption heat pump heating system can achieve better economic benefits.And environmental benefits,providing a new way of thinking for energy conservation and emission reduction and sustainable development.