Patent ID: 11965695
Assignee: SHUNDE POLYTECHNIC
Field: Chemical engineering (Chemistry)
Classification: CPC F | IPC F

Claim 1:
2. A control method of the closed variable-frequency heat pump drying device with the heat regenerator of claim 1, comprising the following steps:
(I) setting parameters of a drying process in a controller (13), i.e. set air inlet temperature T0 and set air inlet humidity φ0 of medium air of the drying bin (10), and set air humidity difference Δφ′ and set air temperature difference φT′ of the medium air entering and exiting the drying bin (10);
(II) measuring, by the controller (13), the actual air inlet temperature T1 at the inlet of the drying bin (10) through the air inlet temperature sensor (8), and comparing magnitudes of the actual air inlet temperature T1 and set air inlet temperature T0 to regulate the frequency of the variable-frequency compressor (1);
(III) measuring, by the controller (13), the actual air inlet humidity φ1 at the inlet of the drying bin (10) through the air inlet humidity sensor (9), and comparing magnitudes of the actual air inlet humidity φ1 and set air inlet humidity φ2 to regulate a ratio of the straight-through air volume to regenerated air volume of the three-way valve (6); and
(IV) regulating, by the controller (13), the frequency of the variable-frequency fan (7) by comparing the actual air humidity change value Δφ(Δφ=φ1−φ2) of the medium air entering and exiting the drying bin (10) and the set air humidity difference Δφ′ and comparing the actual air temperature change value ΔT(ΔT=T1−T2) and the set air temperature difference ΔT′, wherein in the regulation process, a deviation between ΔT and ΔT′ is used as a limit control parameter, and a deviation between Δφand Δφ′ is used as a process control parameter, that is, in the regulation process: (i) if ΔT<ΔT′, when Δφ<Δφ′, the frequency of the variable-frequency fan (7) is reduced, and when Δφ>Δφ′, the frequency of the variable-frequency fan (7) is increased; and (ii) if ΔT>ΔT′, the frequency of the variable-frequency fan (7) is increased to realize ΔT<ΔT′.