Study on Modeling and Control Simulation of Steam-type High Temperature Solid Heat Storage System
Based on MATLAB/simulink software,a simulation model of a steam-type solid heat storage and heating system was established,which included components such as thermal storage body,waste heat boiler,fan and water pump.The dynamic characteristics of the system were analyzed under constant inlet air volume and constant outlet air temperature modes.Results show that four control methods are formed according to the opening of steam drum outlet valve and the sequence of fan air volume adjustment for the conditions of steam drum pressure rise and user heat load reduction.When the air volume is maintained at 5.5 kg/s,the outlet hot air temperature of the heat storage body and the steam production of the waste heat boiler will continue to decrease.Within 6 000 seconds,the temperature of the heat storage body de-creases from 710 ℃ to 612 ℃,and the steam production of the waste heat boiler reduces from 0.88 kg/s to 0.67 kg/s.Under the working condition of pressure rise,first adjust the opening of the steam drum outlet valve,and then control the air volume at the fan outlet.Compared with the opposite adjustment se-quence,this saves half of the adjustment time of the system's steam supply pressure change,which needs only about 90 seconds.In response to the user's heat load reduction condition,first adjust the opening of the steam drum outlet valve and then adjust the fan outlet air volume.It only takes about 60 seconds to reduce the steam supply heat load from 0.6 kg/s to 0.4 kg/s.However,the steam drum pressure and water level fluctuate greatly,with fluctuation values of 0.08 MPa and 0.03 m,respectively.
NETL
NSTL
万方数据
