Multi-stage waste heat recovery and free heat distribution Air source hot air drying system and heat distribution method
A technology of waste heat recovery and hot air drying, which is applied in the direction of drying solid materials, drying gas arrangement, drying, etc., can solve the problems of insufficient recovery and utilization of waste heat, unsatisfactory drying effect, and easy frosting of the evaporator 13, etc., to achieve It is beneficial to balance stability, improve work efficiency and operation stability, and have obvious energy-saving effects
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Embodiment 1
[0044] figure 1 It is a structural schematic diagram of the multi-stage waste heat recovery and free heat distribution air source hot air drying system of this embodiment. Depend on figure 1 It can be seen that the multi-stage waste heat recovery and free heat distribution air source hot air drying system of this embodiment includes a drying unit 3, an air source heat pump unit 1 and a multi-stage heat recovery unit 2; the multi-stage heat recovery unit 2 recovers heat to make its own The heat-carrying fluid is heated, and the heated heat-carrying fluid is used as a heat source to preheat the fresh air of the air source heat pump unit 1 and the drying unit 3;
[0045] The air source heat pump unit 1 and the drying unit 3 form an air energy heat pump drying system, which mainly utilizes the inverse Carnot principle. The gas refrigerant is pressurized by the compressor 11 to become a high-temperature and high-pressure gas, which enters the indoor side (condenser 12), The refri...
Embodiment 2
[0060] The multi-stage heat recovery unit 2 of this embodiment includes a primary heat recovery subunit 21 and a secondary heat recovery subunit 22, wherein the secondary heat recovery subunit 22 is connected in series at the inner chamber fluid output end of the primary heat recovery subunit 21 , the inner cavity fluid output end of the secondary heat recovery subunit 22 is connected to the inner cavity fluid input end of the primary heat recovery subunit 21 through a heat recovery pump 24 to form a waste heat recovery loop.
[0061] The other components and their connections are the same as in Embodiment 1.
[0062] The method of realizing multi-stage waste heat recovery and free heat distribution by using the air source hot air drying system of multi-stage waste heat recovery and free heat distribution in this embodiment is specifically:
[0063] (1) Recover the hot air discharged from the drying unit 3, and exchange heat with the primary heat recovery sub-unit 21, so as to...
Embodiment 3
[0066] The multi-stage heat recovery unit 2 of this embodiment includes a primary heat recovery subunit 21, an intermediate heat recovery subunit, and a final final heat recovery subunit. The intermediate heat recovery subunits are 2 to 3 stages, and the Through pipeline communication, a regulating valve 25 is installed on each connecting pipe, and the flow direction of the heat-carrying fluid in the intermediate heat recovery subunit is changed through the regulating valve 25, thereby adjusting the series connection or connection between each intermediate heat recovery subunit. Parallel connection. The fluid output end of the intermediate-stage heat recovery subunit communicates with the first-stage heat recovery subunit 21 and the final final-stage heat recovery subunit through pipelines, and the final final-stage heat recovery subunit communicates with the first-stage heat recovery subunit through a heat recovery pump 24 21 is connected to the inner chamber fluid input end ...
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