Two-stage heat pump drying system for hydrogen-driven coupling rotary wheel dehumidification

Abstract

The utility model discloses a two-stage heat pump drying system for hydrogen-driven coupling rotary wheel dehumidification. A hydrogen fuel supply system of the two-stage heat pump drying system comprises an upstream hydrogen fuel system and a downstream hydrogen fuel system. The hydrogen engine driving system comprises a hydrogen engine, a belt pulley, a coupler, a gearbox, a water pump and a flue gas heat exchanger. The two-stage compression heat pump system comprises a low-pressure-stage compressor, a high-pressure-stage compressor, an intercooler, a liquid storage device, an auxiliary condenser, a main condenser, an evaporator, a throttling valve, a one-way valve and an electronic expansion valve. The rotating wheel dehumidification system comprises a dehumidification rotating wheel, a total heat exchanger, a regeneration fan, a dehumidification fan and a drying box. The system is stable and efficient in operation, full utilization of waste heat is achieved, the utilization rate of energy is improved, energy is saved, emission is reduced, power consumption is reduced, and the service life is prolonged. Independent temperature and humidity control can be achieved, the heating efficiency and the drying rate in a low-temperature environment are improved, the dew point temperature of dehumidified air is increased, and the drying effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of two-stage heat pump drying system of hydrogen gas drive coupling runner dehumidification, belong to heat pump drying technical field. BACKGROUND

[0002] Drying technology is widely used in industry, agriculture and other fields. As the country with the highest output of fruits and vegetables and aquatic products in the world, drying technology is a necessary processing link, but the drying process consumes a lot of energy. Therefore, in order to meet the requirements of energy-efficient, green and safe, low-carbon and high-quality products, it is urgent to develop new efficient combined drying technology. China's traditional drying technology is relatively backward, with low drying quality and high energy consumption.

[0003] The current commonly used heat pump drying technology has some shortcomings in drying and dehumidifying.

[0004] First, the drying temperature of heat pump is relatively low, generally below 50℃. If a higher drying temperature is provided, the temperature difference between the condensing temperature and the evaporation temperature will be larger, resulting in high compression ratio, rapid decrease in compressor volumetric efficiency, rapid decrease in heating capacity, significant increase in compressor power consumption, and increase in exhaust temperature, which will accelerate the wear of mechanical parts inside the compressor and shorten the service life of the compressor.

[0005] Second, most of the current commonly used heat pump drying is based on single-stage vapor compression refrigeration, which can only achieve a low drying temperature, resulting in a long drying process and easy deterioration of heat-sensitive materials.

[0006] Third, the performance of single-stage compression heat pump is extremely sensitive to environmental temperature, especially in low-temperature environment. The decrease in evaporation temperature leads to a decrease in compressor suction volume, and the system heating efficiency is significantly reduced, affecting the drying effect.

[0007] Fourth, heat pump dehumidifying and drying has obvious energy-saving effect. The air is cooled by the evaporator to remove moisture, but the temperature of the air coming out of the drying chamber is relatively high, and the temperature decreases by a limited amount after passing through the evaporator, resulting in unsatisfactory dehumidifying effect. The dew point temperature after dehumidifying is relatively high, and the water vapor partial pressure of the drying air is relatively high, which makes the drying driving force, the water vapor pressure difference, relatively low, which will further affect the dehumidifying effect of the drying air and further reduce the drying rate of the heat pump drying.

[0008] Fifth, rotary dehumidification is a process in which the adsorbent material in the rotary dehumidifier adsorbs the moisture in the wet air, and the regeneration air is regenerated in the regeneration zone of the rotary dehumidifier. It has good dehumidifying effect, but the temperature of the regeneration air is relatively high, and the required heat is relatively large, resulting in high energy consumption. UTILITY MODEL CONTENTS

[0009] The utility model discloses a hydrogen gas drive coupling runner dehumidification two-stage heat pump drying system.

[0010] The utility model discloses a hydrogen gas drive coupling runner dehumidification two-stage heat pump drying system, it is characterized in that, it includes hydrogen gas fuel supply system, hydrogen gas engine drive system, two-stage compression heat pump system and runner dehumidification system.

[0011] The hydrogen gas fuel supply system includes upstream hydrogen gas fuel system and downstream hydrogen gas fuel system, and the upstream hydrogen gas fuel system includes a plurality of first hydrogen gas bottles connected in parallel with each other, each first hydrogen gas bottle is connected with a switch valve and a pressure regulator, the pressure regulator is connected with the inlet of a hydrogen gas filter through a first emergency shutdown valve, the outlet of the hydrogen gas filter is connected with the inlet of a mass flow meter through a first pressure sensor, a second hydrogen gas bottle is connected with a first pressure sensor through a second switch valve and a third switch valve, the outlet of the mass flow meter is connected with the hydrogen gas inlet of a hydrogen gas mixer through a second pressure sensor, the hydrogen gas mixer is arranged below the inlet of an arrestor, the outlet of the arrestor is connected with a hydrogen gas engine through a second emergency shutdown valve, and the arrestor is connected with a pressure release valve.

[0012] The hydrogen gas engine drive system includes a hydrogen gas engine, the hydrogen gas engine is connected with a second belt pulley and a third belt pulley through a first belt pulley, the second belt pulley is connected with a high-pressure stage compressor of a two-stage compression heat pump system through a first coupling, a first gearbox and a first outlet of the hydrogen gas engine, the third belt pulley is connected with a low-pressure stage compressor of the two-stage compression heat pump system through a second coupling, a second gearbox and a second outlet of the hydrogen gas engine, the first outlet of the hydrogen gas engine is connected with the first inlet of a second heat exchanger through a first water pump, the first outlet of the second heat exchanger is connected with the inlet of the hydrogen gas engine, the second outlet of the hydrogen gas engine is connected with the first inlet of a flue gas heater, the first outlet of a flue gas heat exchanger outputs flue gas, the second outlet of the flue gas heater is connected with the first inlet of a first heat exchanger through a second water pump, and the first outlet of the first heat exchanger is connected with the second inlet of the flue gas heat exchanger.

[0013] The double-stage compression heat pump system comprises a low-pressure stage compressor, a refrigerant outlet of the low-pressure stage compressor is connected with a refrigerant inlet of a high-pressure stage compressor through a third one-way valve, a refrigerant outlet of the high-pressure stage compressor is connected with an inlet of a main condenser through a second electronic expansion valve in one way and through a first electronic expansion valve in another way, an outlet of the auxiliary condenser is connected with an inlet of the main condenser through a third electronic expansion valve in one way and through a first one-way valve and a fourth electronic expansion valve in another way, an outlet of the main condenser is connected with a liquid inlet of a liquid reservoir through a second one-way valve, a liquid outlet of the liquid reservoir is connected with a first liquid inlet of an intercooler in one way and with a second liquid inlet of the intercooler through a first throttling valve in another way, an air outlet of the intercooler is connected with an air inlet of the high-pressure stage compressor, a liquid outlet of the intercooler is connected with a liquid inlet of an evaporator through a second throttling valve, and an air outlet of the evaporator is connected with an air inlet of the low-pressure stage compressor.

[0014] The rotary dehumidification system comprises a dehumidification rotary wheel, a dehumidification outlet of the dehumidification rotary wheel is connected with a first air inlet of a total heat exchanger through an air duct, a first air outlet of the total heat exchanger is connected with an air inlet of a main condenser through an air duct, an air outlet of the main condenser is connected with an air inlet of a drying box, an air outlet of the drying box is connected with an air inlet of an evaporator through an air duct, an air outlet of the evaporator is connected with a dehumidification fan through an air duct, the dehumidification fan is connected with a dehumidification inlet of the dehumidification rotary wheel through an air duct, an air outlet of the auxiliary condenser is connected with a second inlet of a second heat exchanger through an air duct, a second outlet of the second heat exchanger is connected with a second inlet of a first heat exchanger through an air duct, a second outlet of the first heat exchanger is connected with a regenerative fan through an air duct, the regenerative fan is connected with a regenerative inlet of the dehumidification rotary wheel through an air duct, and a regenerative outlet of the dehumidification rotary wheel is connected with a second air inlet of the total heat exchanger through an air duct, and a second air outlet of the total heat exchanger is connected with the outside.

[0015] Further, the hydrogen gas mixer is 15.25 cm away from the inlet of the flame arrester.

[0016] The hydrogen energy is a new energy which is independent of fossil fuels and has abundant reserves. Compared with oil fuel, hydrogen has better combustion performance and fast flame propagation speed, which is beneficial to improving combustion efficiency. The hydrogen engine driven heat pump compressor can realize heat pump circulation, and the flue gas and cylinder cooling water discharged by the hydrogen engine contain a large amount of waste heat resources.

[0017] The utility model discloses a hydrogen engine does work drives the belt pulley rotation, and then drives the shaft coupling and gearbox to work, thereby drive low pressure stage compressor and high pressure stage compressor work. Realize two stage compression heat pump circulation, and hydrogen machine waste heat is used for the heating of the air regeneration of runner dehumidification, and the two stage waste heat recovery of total heat exchanger is combined, and the heat pump drying of higher temperature and lower humidity is realized.

[0018] First, the utility model discloses hydrogen engine, belt pulley, shaft coupling, gearbox, flue gas heat exchanger, and through hydrogen engine work to drive low pressure stage compressor and high pressure stage compressor work, thereby drive whole two stage compression heat pump system operation, through shaft coupling, gearbox realizes the collaborative high -efficient operation of high pressure stage and low pressure stage compressor.

[0019] Second, through heat exchanger etc. Component realizes two stage high low grade waste heat recovery, that is, through flue gas heat exchanger, water pump, heat exchanger etc. Component realizes the high grade waste heat recovery of flue gas and cylinder liner cooling water, through total heat exchanger realizes the low grade waste heat recovery of dry air. Through flue gas heat exchanger and heat exchanger etc. Component realizes the heat exchange with regenerative air, improves the regeneration temperature of regenerative air, realizes the full use of waste heat, improves the energy utilization, reaches the effect of energy saving and emission reduction.

[0020] Third, the utility model discloses through low pressure stage compressor, high pressure stage compressor, main condenser, auxiliary condenser, intermediate cooler, liquid accumulator, throttle valve, evaporator and electronic expansion valve realizes two stage compression heat pump circulation, also can realize the series connection and parallel connection of main condenser and auxiliary condenser through electronic expansion valve, main condenser, auxiliary condenser and auxiliary valve, while guaranteeing the stable operation of system, solve the problem of too big temperature difference of condensing temperature and evaporating temperature, reduce the power consumption of compressor, prolong the service life of compressor.

[0021] Fourth, the utility model discloses coupling runner dehumidification drying system and two stage compression heat pump system, can realize temperature and humidity independent control, improve the heating efficiency of system under low temperature environment, improve the dew point temperature of dehumidified air, improve drying effect, improve the drying rate of system under low temperature environment, satisfy the drying demand of system under low temperature environment.

[0022] Fifth, the utility model recycles engine tail gas waste heat, according to the different operating conditions, hydrogen engine tail gas temperature can reach 200~500 DEG C, through the part of tail gas heating to 450 DEG C above and directly for reaction system heat supply, both guarantee the heat source stability, and make full use of the heat in engine tail gas, improve the overall energy utilization of system. DRAWINGS

[0023] Figure 1 It is the structural schematic diagram of the utility model discloses;

[0024] Figure 2The area chart of the dehumidification rotary wheel of the utility model;

[0025] In the figure: 1, low-pressure stage compressor, 2, high-pressure stage compressor, 3, intermediate cooler, 4, liquid accumulator, 5, first check valve, 6, auxiliary condenser, 7, main condenser, 8, second check valve, 9, first throttle valve, 10, regenerative fan, 11, evaporator, 12, dehumidification fan, 13, dehumidification rotary wheel, 14, total heat exchanger, 15, drying box, 16, first electronic expansion valve, 17, second electronic expansion valve, 18, third electronic expansion valve, 19, second throttle valve, 20, fourth electronic expansion valve, 21, third check valve, 22, hydrogen engine, 23, first belt pulley, 24, second belt pulley, 25, first coupling, 26, first gearbox, 27, third belt pulley, 28, second gearbox, 29, second coupling, 30, first water pump, 31, second water pump, 32, flue gas heat exchanger, 33, first heat exchanger, 34, second heat exchanger, 35, second emergency shutdown valve, 36, pressure release valve, 37, flame arrestor, 38, hydrogen mixer, 39, first pressure sensor, 40, second pressure sensor, 41, first on-off valve, 42, hydrogen filter, 43, second on-off valve, 44, first hydrogen cylinder, 45, third on-off valve, 46, pressure regulator, 47, first emergency shutdown valve, 48, second hydrogen cylinder, 49, mass flow meter. DETAILED DESCRIPTION

[0026] The specific embodiments of the utility model will be described in detail below in combination with the drawings:

[0027] As Figure 1 shown, a dual-stage heat pump drying system driven by hydrogen coupling rotary wheel dehumidification includes a hydrogen fuel supply system, a hydrogen engine drive system, a dual-stage compression heat pump system and a rotary wheel dehumidification system.

[0028] The hydrogen fuel supply system comprises two subsystems, namely an upstream hydrogen fuel system and a downstream hydrogen fuel system. The upstream hydrogen fuel system comprises a hydrogen mixer 38, a first pressure sensor 39, a second pressure sensor 40, a first switch valve 41, a hydrogen filter 42, a second switch valve 43, a first hydrogen cylinder 44, a third switch valve 45, a pressure regulator 46, a first emergency shut-off valve 47, and a mass flow meter 49; the downstream hydrogen fuel system comprises a second emergency shut-off valve 35, a pressure release valve 36, and a flame arrester 37. The first hydrogen cylinder 44 is used to store hydrogen and provide sufficient hydrogen for the hydrogen fuel supply system. A plurality of (5 in this embodiment) first hydrogen cylinders 44 are connected in parallel with each other, each first hydrogen cylinder 44 is connected to the switch valve 41 and the pressure regulator 46, the pressure regulator 46 is connected to the inlet of the hydrogen filter 42 through the first emergency shut-off valve 47, and the outlet of the hydrogen filter 42 is connected to the inlet of the mass flow meter 49 through the first pressure sensor 39. The second hydrogen cylinder 48 is connected to the first pressure sensor 39 through the second switch valve 43 and the third switch valve 45, the outlet of the mass flow meter 49 is connected to the hydrogen inlet of the hydrogen mixer 38 through the second pressure sensor 40, the hydrogen mixer 38 is installed 15.25 cm below the inlet of the flame arrester 37, the outlet of the flame arrester 37 is connected to the hydrogen engine 22 through the second emergency shut-off valve 35, and the flame arrester 37 is connected to the pressure release valve 36.

[0029] The hydrogen engine driving system comprises a hydrogen engine 22, a first pulley 23, a second pulley 24, a first coupling 25, a first gearbox 26, a third pulley 27, a second gearbox 28, a second coupling 29, a first water pump 30, a second water pump 31, a flue gas heat exchanger 32, a first heat exchanger 33, and a second heat exchanger 34. The output end of the hydrogen engine 22 is connected to the first pulley 23, the first pulley 23 is connected to the second pulley 24 and the third pulley 27 through shafts, the other end of the second pulley 24 is connected to the first coupling 25 through a shaft, the first coupling 25 is connected to the first gearbox 26 through a shaft, and the first gearbox 26 is connected to the high-pressure stage compressor 2; the other end of the third pulley 27 is connected to the second coupling 29 through a shaft, the second coupling 29 is connected to the second gearbox 28 through a shaft, and the other end of the second gearbox 28 is connected to the low-pressure stage compressor 1 through a shaft. The first outlet of the hydrogen engine 22 is connected to the first inlet of the second heat exchanger 34 through the first water pump 30, and the first outlet of the second heat exchanger 34 is connected to the inlet of the hydrogen engine 22. The second outlet of the hydrogen engine 22 is connected to the first inlet of the flue gas heater 32, the first outlet of the flue gas heat exchanger 32 outputs flue gas, the second outlet of the flue gas heater 32 is connected to the first inlet of the first heat exchanger 33 through the second water pump 31, and the first outlet of the first heat exchanger 33 is connected to the second inlet of the flue gas heat exchanger 32.

[0030] The double-stage compression heat pump system comprises a low-pressure stage compressor 1, a high-pressure stage compressor 2, an intermediate cooler 3, a liquid accumulator 4, a first one-way valve 5, an auxiliary condenser 6, a main condenser 7, a second one-way valve 8, a first throttling valve 9, an evaporator 11, a first electronic expansion valve 16, a second electronic expansion valve 17, a third electronic expansion valve 18, a second throttling valve 19, a fourth electronic expansion valve 20 and a third one-way valve 21. The refrigerant outlet of the low-pressure stage compressor 1 is connected with the refrigerant inlet of the high-pressure stage compressor 2 through the third one-way valve 21, the refrigerant outlet of the high-pressure stage compressor 2 is connected with the inlet of the main condenser 7 through one of the second electronic expansion valve 17, and the inlet of the auxiliary condenser 6 through the other of the first electronic expansion valve 16, the outlet of the auxiliary condenser 6 is connected with the inlet of the main condenser 7 through one of the third electronic expansion valve 18 and the other of the first one-way valve 5 and the fourth electronic expansion valve 20 and the liquid inlet of the liquid accumulator 4, the outlet of the main condenser 7 is connected with the liquid inlet of the liquid accumulator 4 through the second one-way valve 8, the liquid outlet of the liquid accumulator 4 is connected with the first liquid inlet of the intermediate cooler 3 through one of the pipelines and the second liquid inlet of the intermediate cooler 3 through the other of the first throttling valve 9, the gas outlet of the intermediate cooler 3 is connected with the gas inlet of the high-pressure stage compressor 2, the liquid outlet of the intermediate cooler 3 is connected with the liquid inlet of the evaporator 11 through the second throttling valve 19, and the gas outlet of the evaporator 11 is connected with the gas inlet of the low-pressure stage compressor 1.

[0031] The rotary dehumidification system comprises a dehumidification rotary wheel 13, a total heat exchanger 14, a regeneration fan 10, a dehumidification fan 12 and a drying box 15. The dehumidification outlet of the dehumidification rotary wheel 13 is connected with the first air inlet of the total heat exchanger 14 through an air duct, the first air outlet of the total heat exchanger 14 is connected with the air inlet of the main condenser 7 through an air duct, the air outlet of the main condenser 7 is connected with the air inlet of the drying box 15, the air outlet of the drying box 15 is connected with the air inlet of the evaporator 11 through an air duct, the air outlet of the evaporator 11 is connected with the dehumidification fan 12 through an air duct, the dehumidification fan is connected with the dehumidification inlet of the dehumidification rotary wheel 13 through an air duct, the air outlet of the auxiliary condenser 6 is connected with the second inlet of the second heat exchanger 34 through an air duct, the second outlet of the second heat exchanger 34 is connected with the second inlet of the first heat exchanger 33 through an air duct, the second outlet of the first heat exchanger 33 is connected with the regeneration fan 10 through an air duct, the regeneration fan 10 is connected with the regeneration inlet of the dehumidification rotary wheel 13 through an air duct, the regeneration outlet of the dehumidification rotary wheel 13 is connected with the second air inlet of the total heat exchanger 14 through an air duct, and the second air outlet of the total heat exchanger 14 is connected with the outside.

[0032] The hydrogen engine drives the double-stage compression heat pump system to run, and the rotary dehumidification system is used for drying and dehumidification.

[0033] In the hydrogen fuel supply system, the supply of hydrogen fuel from the first hydrogen cylinder 44 is controlled by adjusting the opening of the first on-off valve 41. The high pressure hydrogen stored in the first hydrogen cylinder 44 is regulated to a suitable working pressure by the pressure regulator 46, and then enters the hydrogen filter 42, which filters out other impurities in the hydrogen. The filtered hydrogen enters the mass flow meter 49, and then enters the hydrogen mixer 38, where it is mixed with air. The mixed gas then enters the hydrogen engine 22 through the flame arrester 37. When an emergency situation occurs, the first emergency shut-off valve 47 is closed, stopping the supply of high pressure hydrogen. The pressure of the high pressure hydrogen entering the system is regulated by the pressure regulator 46 to maintain stability. The hydrogen entering the hydrogen engine 22 is metered by the mass flow meter 49.

[0034] In the hydrogen fuel supply system, when the system needs to be maintained, repaired, or has a fault, etc., in order to safely handle the residual hydrogen in the system, the second hydrogen cylinder 48 is used to collect the residual hydrogen and prevent hydrogen leakage. At this time, the second on-off valve 43 and the third on-off valve 45 are opened, and the first on-off valve 41 is closed, stopping the supply of hydrogen from the first hydrogen cylinder 44. The residual hydrogen in the system slowly flows into the second hydrogen cylinder 48 under the action of the pressure difference through the second on-off valve 43 and the third on-off valve 45. The hydrogen pressure and flow rate flowing into the second hydrogen cylinder 48 are monitored by the first pressure sensor 39 and the mass flow meter 49 during the collection process. The collected hydrogen is stored in the second hydrogen cylinder 48, at which time the second on-off valve 43 and the third on-off valve 45 are opened, and the first on-off valve 41 is opened. The hydrogen in the second hydrogen cylinder 48 is mixed with the filtered hydrogen from the hydrogen filter 42, and then enters the mass flow meter 49 to continue to provide hydrogen for the hydrogen fuel supply system.

[0035] The upstream hydrogen fuel system continuously provides hydrogen under constant pressure conditions, and cuts off the supply of hydrogen in emergency situations. The main function of the downstream hydrogen fuel supply system is to meter and ensure that hydrogen is delivered to the hydrogen engine drive system in the right way, and to prevent backfiring. The flame arrester 37 has a large volume, which can satisfy the smooth passage of hydrogen and air mixture. The flame arrester 37 can block the spread of hydrogen flame caused by backfiring, and at the same time, the pressure relief valve 36 can reduce the pressure of the intake system caused by backfiring.

[0036] The hydrogen engine 22 drives the first pulley 23 to rotate by doing work, thereby driving the second pulley 24 and the third pulley 27 to rotate, driving the first coupling 25 and the second coupling 29 to operate through the rotation of the pulleys, and further driving the first gearbox 26 and the second gearbox 28 to operate, thereby driving the low-pressure stage compressor 1 and the high-pressure stage compressor 2 to operate. The flue gas discharged by the hydrogen engine 22 is recovered by the flue gas heat exchanger 32 to recover the heat of the flue gas, exchanges heat with cooling water to heat the cooling water, and the flue gas after heat release is discharged to the outside, realizing the waste heat recovery of the flue gas. The cooling water after heat exchange with the flue gas exchanges heat with the regeneration air through the second water pump 31 and the first heat exchanger 33 to heat the regeneration air and improve the temperature of the regeneration air. In addition, the waste heat generated by the hydrogen engine 22 exchanges heat with the cooling water, and the cooling water exchanges heat with the regeneration air through the first water pump 30 and the second heat exchanger 34, and the regeneration air is heated by the first heat exchanger 33 and the second heat exchanger 34, further improving the temperature of the regeneration air.

[0037] The high-pressure liquid from the main condenser 7 first enters the liquid accumulator 4 for storage, and then is divided into two paths. One path passes through the intermediate cooler 3 and the first throttling valve 9 to reduce the pressure to the intermediate pressure and evaporate in the intermediate cooler 3. The other part flows through the intermediate cooler 3 in the coil, exchanges heat with the evaporated refrigerant vapor outside the coil at the intermediate pressure, achieves the purpose of supercooling, and then evaporates in the evaporator 11. The saturated vapor from the evaporator 11 is sucked into the low-pressure stage compressor 1 and compressed to the intermediate pressure, and then discharged into the high-pressure stage compressor 2. After mixing with the saturated vapor from the intermediate cooler 3, it enters the high-pressure stage compressor 2 to be compressed to the condensing pressure, and then condenses into high-pressure liquid in the main condenser 7, and then circulates again.

[0038] As shown in Figure 2 The dehumidification wheel is divided into two areas, a regeneration area and a dehumidification area. The operation mechanism of the wheel dehumidifier includes two processes of dehumidification and regeneration. In the dehumidification process, humid air enters the dehumidification area of the wheel, and the water vapor in the humid air is adsorbed by the hygroscopic agent, and the air becomes dry. With the rotation of the wheel into the regeneration area, the hygroscopic agent is desorbed by heating the regeneration air to restore its moisture absorption capacity. The regeneration air loses sensible heat in the desorption process and becomes wet air, which is discharged to the outside, completing the moisture transfer.

[0039] In the system, after the dry air dries the material in the drying chamber 15, it is heat-exchanged in the evaporator 11, releases heat and lowers the temperature, the air with lowered temperature is dehumidified in the dehumidification area of the dehumidification runner 13 under the action of the dehumidification fan 12, the dry air after dehumidification is heat-exchanged in the total heat exchanger 14 and the main condenser 7, the temperature of the air is raised, the high-temperature dry air enters the drying chamber 15 again to dry the material. The regeneration air is heat-exchanged in the auxiliary condenser 6 under the action of the regeneration fan 10 to raise the regeneration temperature, then is heat-exchanged in the first heat exchanger 33 and the second heat exchanger 34 in turn to further raise the regeneration temperature, then enters the regeneration area of the dehumidification runner 13, the air after regeneration can enter the total heat exchanger 14 to be heat-exchanged with the dehumidified air to recycle the heat. In addition, the opening of the first electronic expansion valve 16 can be adjusted to control the flow of the refrigerant entering the auxiliary condenser 6, the temperature of the regeneration air can be controlled by heat-exchanging with the regeneration air, the main condenser 7 and the auxiliary condenser 6 can be realized in series or parallel by adjusting the opening of the third electronic expansion valve 18 and the fourth electronic expansion valve 20.

[0040] It should be understood that the parts not elaborated in the specification are all prior art. The above examples only describe the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical solutions of the present application made by ordinary engineering technicians in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A dual-stage heat pump drying system driven by hydrogen coupling with a rotary dehumidifier, characterized in that, It includes hydrogen fuel supply system, hydrogen engine drive system, two-stage compression heat pump system and rotary dehumidification system; The hydrogen fuel supply system comprises an upstream hydrogen fuel system and a downstream hydrogen fuel system; the upstream hydrogen fuel system comprises a plurality of first hydrogen cylinders connected in parallel, each first hydrogen cylinder being connected with a switch valve and a pressure regulator, the pressure regulator being connected with the inlet of a hydrogen filter through a first emergency shut-off valve, the outlet of the hydrogen filter being connected with the inlet of a mass flow meter through a first pressure sensor, a second hydrogen cylinder being connected with the first pressure sensor through a second switch valve and a third switch valve, the outlet of the mass flow meter being connected with the hydrogen inlet of a hydrogen mixer through a second pressure sensor, the hydrogen mixer being arranged below the inlet of an arrestor, the outlet of the arrestor being connected with a hydrogen engine through a second emergency shut-off valve, the arrestor being connected with a pressure relief valve; The hydrogen engine drive system comprises a hydrogen engine, the hydrogen engine being connected with a second pulley and a third pulley through a first pulley, the second pulley being connected with a high-pressure stage compressor of the two-stage compression heat pump system through a first coupling, a first gearbox, the third pulley being connected with a low-pressure stage compressor of the two-stage compression heat pump system through a second coupling, a second gearbox, a first outlet of the hydrogen engine being connected with a first inlet of a second heat exchanger through a first water pump, a first outlet of the second heat exchanger being connected with the inlet of the hydrogen engine, a second outlet of the hydrogen engine being connected with a first inlet of a flue gas heater, a first outlet of the flue gas heater outputting flue gas, a second outlet of the flue gas heater being connected with a first inlet of a first heat exchanger through a second water pump, a first outlet of the first heat exchanger being connected with a second inlet of the flue gas heater; The two-stage compression heat pump system comprises a low-pressure stage compressor, a refrigerant outlet of the low-pressure stage compressor being connected with a refrigerant inlet of a high-pressure stage compressor through a third check valve, a refrigerant outlet of the high-pressure stage compressor being connected with the inlet of a main condenser through a second electronic expansion valve in one way, and being connected with the inlet of an auxiliary condenser through a first electronic expansion valve in another way, an outlet of the auxiliary condenser being connected with the inlet of the main condenser through a third electronic expansion valve in one way, and being connected with the liquid inlet of a liquid accumulator through a first check valve and a fourth electronic expansion valve in another way, an outlet of the main condenser being connected with the liquid inlet of the liquid accumulator through a second check valve, a gas outlet of an intermediate cooler being connected with the gas inlet of the high-pressure stage compressor, a liquid outlet of the intermediate cooler being connected with the liquid inlet of an evaporator through a second throttling valve, a gas outlet of the evaporator being connected with the gas inlet of the low-pressure stage compressor. The rotary dehumidification system comprises a dehumidification rotary wheel, a dehumidification outlet of the dehumidification rotary wheel is connected with a first air inlet of a total heat exchanger through an air duct, a first air outlet of the total heat exchanger is connected with an air inlet of a main condenser through an air duct, an air outlet of the main condenser is connected with an air inlet of a drying box, an air outlet of the drying box is connected with an air inlet of an evaporator through an air duct, an air outlet of the evaporator is connected with a dehumidification fan through an air duct, the dehumidification fan is connected with a dehumidification inlet of the dehumidification rotary wheel through an air duct; an air outlet of an auxiliary condenser is connected with a second inlet of a second heat exchanger through an air duct, a second outlet of the second heat exchanger is connected with a second inlet of a first heat exchanger through an air duct, a second outlet of the first heat exchanger is connected with a regenerative fan through an air duct, the regenerative fan is connected with a regenerative inlet of the dehumidification rotary wheel through an air duct, a regenerative outlet of the dehumidification rotary wheel is connected with a second air inlet of the total heat exchanger through an air duct, and a second air outlet of the total heat exchanger is connected with the outside.

2. The dual-stage heat pump drying system of claim 1, wherein The hydrogen gas mixer is 15.25 cm from the inlet of the flame arrester.

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