37results about How to "Increase working fluid temperature" patented technology

The invention discloses a hot air drying system heated by double energy sources, which comprises a heating chamber with a fresh air opening, a drying chamber, a solar heating device, an air source heat pump and a condenser fan of the air source heat pump, wherein the upper part of the heating chamber or the drying chamber is provided with a dehumidifying opening; a condenser and the condenser fan of the air source heat pump are arranged in the heating chamber; a hot water heat exchanger of the solar heating device is arranged at the front end of an air inlet of the condenser in the heating chamber; the condenser fan supplies air in an induced draft way; the ratio of the heat exchange area of the condenser to the input power of a compressor is 5.3 to 11 m<2> / kw; the ratio of the heat exchange area of the hot water heat exchanger to the input power of the compressor is not less than 1.5 m<2> / kw; and the total pressure of the condenser fan is 100 to 400 Pa. The hot air drying system heated by the double energy sources makes full use of solar energy as a hot air heat source for drying, solves the problems of the independent use of the solar energy, achieves high energy efficiency ratio by adopting the air heat pump as the hot air heat source, is energy-saving, environmentally-friendly and low in running cost, and manifests the advantages of the combined use of the air source and the solar energy in oven-drying.

The invention discloses a duplex working medium cooling experimental system used for gas turbine blades. The system comprises an experiment section unit including an intake rectifying device and an experiment section in which the turbine blades to be tested are arranged; a main air-supply unit generating the main air which is required by the experiment section and is rectified in the intake rectifying section and enters the experiment section; a cooling air unit generating the cooling air required by the turbine blades to be tested; an exhausting unit exhausting the main air and cooling air of the experiment section and a data collecting unit collecting both the temperature and pressure parameters of the turbine blades to be tested in the experiment section and the parameters of working medium injected into the experiment section and the turbine blades to be tested and also store and analyze the collected data. The system is characterized in that the system also comprises a cooling steam unit comprising a water disposal device, a water-supply device and a steam generator which are sequentially connected through pipelines; the cooling steam generated by the steam generator firstly passes the turbine blades to be tested in the experiment section and then is exhausted from the experiment section.

The invention discloses a combined cooling heating and power system for thermal energy gradient utilization and belongs to the technical field of energy. The combined cooling heating and power system for thermal energy gradient utilization comprises a steam Rankine cycle loop subsystem, an organic Rankine cycle loop subsystem and an absorption refrigeration circulation loop subsystem, wherein a first generator of a first expander of the steam Rankine cycle loop subsystem is driven to generate; dead steam or extraction steam in an outlet is divided into two paths, respectively working as a heat source for the organic Rankine cycle loop subsystem and the absorption refrigeration circulation loop subsystem; and energy gradient utilization can be achieved, so energy utilization rate can be improved. The steam Rankine cycle loop subsystem can provide power, the organic Rankine cycle loop subsystem can provide power electricity and daily use hot water and the absorption refrigeration circulation loop subsystem can provide cold water for air conditioners in summer and hot water for radiation type tail end air conditioners in winter. The system can achieve combined heat and power generation or combined cold and heat power generation via a valve according to user needs; and the combined cooling heating and power system for thermal energy gradient utilization is flexible, reliable, energy-saving and practical.

The invention provides a self-deoxidization waste heat boiler suitable for sulfur-containing fuel. The self-deoxidization waste heat boiler comprises a waste heat recovery device, a flash evaporator internally provided with a steam and water separator, a deoxidization water tank communicated with the flash evaporator, a steam pocket and an evaporator arranged in a flue. A heat absorption section and a heat release section of the waste heat recovery device are connected through an ascent pipe and a descent pipe, the heat absorption section is arranged in the flue, the steam pocket is connected with the evaporator through a circulation pipeline, a boiler water supply pipe is connected with a water inlet of the flash evaporator after passing through the heat release section, and a water outlet of the deoxidization water tank is connected with the steam pocket. The flash evaporator is adopted for deoxidization, heat energy used for deoxidization is smoke waste heat of the boiler, the temperature of exhausted smoke of the waste heat boiler can be effectively reduced, waste heat of the boiler is fully used, steam does not need to be extracted in the deoxidization process after the flash evaporator is additionally arranged, the steam amount of the boiler is saved, and the efficiency of the boiler is improved.

The invention relates to a flat-plate paraboloidal solar light-condensing and heat-collecting device, and belongs to the technical field of solar heat utilization. The flat-plate paraboloidal solar light-condensing and heat-collecting device is particularly suitable for the integration of solar energy and buildings, and provides a multifunctional technology-integration high-efficiency heat-condensing device with more application value for the 'South Wall Plan' and the 'Roof Plan'. The flat-plate paraboloidal solar light-condensing and heat-collecting device comprises a light-transmitting and sealing component and a heat-collecting and light-condensing component two big parts, wherein the light-transmitting and sealing component consists of a box body, a bottom plate, a T-shaped fixed strip, a light-transmitting cover plate, a thermal-insulation and heat-preservation coating, a sealant, a vacuumizing head, a working medium inlet, a working medium outlet, a mounting block and an adsorbent storage strip; the light-transmitting cover plate is combined with the T-shaped fixed strip by using the sealant; the combined light-transmitting cover plate and the T-shaped strip are downwards embedded into a groove on the box body; and the heat-collecting and light-condensing component comprises a working medium passage pipe, a heat-absorbing plate, a heat sink strip, a heat-absorbing coating, a paraboloidal light-condensing reflection plate, a light-condensing plate reinforcing rib, a passage pipe joint, a U-shaped connecting bend, a G-spot groove, a thermal-insulation and heat-preservation coating, a fixing plate and a shockproof block.

The invention provides a sludge drying system and a drying process based on a sewage source heat pump. The drying system comprises a sewage circulating device, an intermediate water circulating deviceand a heat pump circulating device, the sewage circulating device comprises a sewage tank connected with a sewage pump, sewage discharged by the sewage pump returns into the sewage tank through a sewage heat exchanger, the intermediate water circulating device comprises a water pump for conveying intermediate water to the sewage heat exchanger, an intermediate water outlet of the sewage heat exchanger is connected with an evaporator, a water outlet of the evaporator is connected with the water pump, the heat pump circulating device comprises a working medium pump and a condenser, a working medium of the evaporator is conveyed to the condenser through the working medium pump to release heat, a working medium outlet of the condenser is connected with the evaporator, air flows through the condenser and then is conveyed to a belt drier by the aid of a fan, and sludge is dried. According to the system and the process, heat energy of urban sewage serves as a low-level heat source of a heatpump device, hot air is generated and enters the belt drier to dry the sludge, energy is saved, and the sludge is treated.

The invention discloses a spiral type thrust engine, relating to a hot air variable capacity type engine device. The spiral type thrust engine comprises an engine shell and a high pressure refrigerant generating device, and also comprises a spiral type thrust generator fixedly arranged inside the engine shell. The spiral type thrust generator comprises a core shaft and a spiral blade which is fixedly arranged at the lateral side of the core shaft, takes the shaft as a rotating shaft, goes forward along the axis direction spirally and extends from the front end to the back end of the core shaft. The whole spiral blade forms a spiral type variable capacity quality guide groove which extends from the front end surface to the back end surface of the core shaft and communicates the front end surface with the back end surface on the core shaft, wherein the cross-sectional area of the groove is gradually increased from front to back in equivalent ratio difference and the front opening of the groove is communicated with a refrigerant output end thereof. The invention provides a spiral type thrust engine which adopts a new thrust generating mode, can generate thrust directly and has simple structure, long service life, easy manufacture, low material requirements, low cost and smaller energy consumption.

The invention provides a waste heat recovery system for a coal-fired power plant. The waste heat recovery system involves a boiler, an air preheater, a plurality of coolers, a dust remover, a desulfurizing tower, a flue gas condensation heat exchanger, a flue gas reheater and a chimney which are sequentially arranged; the plurality of coolers are sequentially connected in series, the outlet temperatures of heat exchange media of the plurality of coolers are sequentially reduced, and the plurality of coolers correspond to different heat using devices; the system involves an absorption heat pump, a thermocline heat storage tank and a heat supply network, and the hot water output end of the thermocline heat storage tank communicates with the heat supply network; and heat generated by part ofthe coolers is used for driving the absorption heat pump to recover heat released in the flue gas condensation process, part of the heat generated by the heat pump is conveyed to the flue gas reheaterto be used for reheating flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in part of coolers and stored in the thermocline heat storage tankto supply heat loads needed by the heat supply network. Gradient utilization of energy is achieved, energy conservation, water recovery and thermoelectric decoupling can be achieved simultaneously, and the unit waste heat and water recovery capacity and the power station operation flexibility are improved.

The invention discloses an operation method and system for a secondary throttle intermediate incomplete cooling refrigeration system, and aims to provide a method and system for defrosting low-temperature evaporators through a low-pressure-stage compressor heat pump cycle. Each low-pressure-stage unit is provided with a medium-temperature evaporator and the corresponding low-temperature evaporator, the medium-temperature evaporators are used for achieving medium-temperature refrigeration, and the low-temperature evaporators are used for achieving low-temperature refrigeration or defrosting. When the certain low-temperature evaporators need to be defrosted, through valve switching, low-pressure-stage compressors for achieving the defrosting function are converted into high-pressure-stage compressors for operation, low-temperature compressors for achieving the defrosting function in the low-pressure-stage units absorb medium-pressure superheated steam from low-pressure-stage compressorsfor achieving the refrigeration function, and after being compressed, the medium-pressure superheated steam conducts condensation heating on the to-be-defrosted low-temperature evaporators to achievedefrosting. The low-temperature evaporators are defrosted through the low-pressure-stage compressor heat pump cycle, temperature fluctuation is small, the defrosting efficiency is high, and the cooling capacity of a refrigeration room and a freezing room can be provided.

The invention discloses a liquid circulation type heat recovery device. The liquid circulation type heat recovery device comprises a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are correspondingly arranged in a fresh air cylinder and a return air cylinder, two ports of the first heat exchanger are correspondingly connected with two portsof the second heat exchanger through pipelines to form a heat recovery circulation loop, a circulation pump is arranged in the heat recovery circulation loop, and the first heat exchanger and the second heat exchanger are both plastic heat exchangers. The liquid circulation type heat recovery device has the advantages of being simple in structure, low in cost, high in corrosion resistance and high in heat exchange efficiency, cannot pollute fresh air due to bacterium breeding, and is particularly suitable for hospitals, kindergartens and other places with high requirements for fresh air quality.

The invention relates to an economizer hot water recirculation system applicable for a subcritical steam drum boiler generator set, and a working method thereof. The hot water recirculation system comprises an economizer, a steam drum, a drop pipe and a water supply pipe, and a water outlet of the economizer, the steam drum and the drop pipe communicate with each other in sequence; the water supply pipe communicates with an inlet of the economizer; the hot water recirculation system further comprises a No.1 electric regulating valve, a No.2 electric regulating valve, a manual shutoff valve, aNo.1 check valve, a No.2 check valve, a circulating pump, a recirculation pipe and a bypass; the recirculation pipe communicates with a lower collection box of the drop pipe, and further communicateswith an inlet collection box of the economizer at the time; the recirculation pipe is provided with the circulating pump of which the both sides are provided with the No.1 electric regulating valve and the manual shutoff valve; the circulating pump is provided with the bypass which is provided with the No.2 electric regulating valve; and the recirculation pipe is provided with the No.1 check valve, and the water supply pipe is provided with the No.2 check valve. The hot water recirculation system can be used for preventing the economizer from being dry-burnt in the start-stop process, and improving the outlet smoke temperature of the economizer under the low load condition, so that the wide load denitrification is achieved.

The invention discloses a new energy coupling thermal power generating unit power generation, energy storage and peak regulation combined system and an operation method. The system comprises a solar power generation device, a wind power generation device, a lithium battery, a power station boiler, a high-pressure turbine, a low-pressure turbine, a generator, a low-temperature heater, a high-temperature heater and a power grid. The solar power generation device is divided into two paths, one path is communicated with the lithium battery, and the other path is communicated with the grid; the wind power generation device is divided into two paths, one path is communicated with the lithium battery, and the other path is communicated with the power grid; an outlet of the power station boiler sequentially communicates with the high-pressure turbine and the low-pressure turbine, and an outlet of the low-pressure turbine is sequentially communicated with the low-temperature heater and the high-temperature heater; the generator is connected with the low-pressure turbine; the output end of the generator is divided into two paths, one path is communicated with a power grid and the other pathis communicated with lithium batteries. Under the condition that wind power generation or solar power generation is sufficient and stable, according to the first scheme, all power generation capacities are directly sent into a power grid to be used by users, and according to the second scheme, part of electric quantity is input into the lithium battery for energy storage through the inverter.

The invention discloses an operation method of a two-stage-throttling intermediate complete cooling type refrigeration system and the two-stage-throttling intermediate complete cooling type refrigeration system. The operation method of the two-stage-throttling intermediate complete cooling type refrigeration system and the two-stage-throttling intermediate complete cooling type refrigeration system aim to achieve that a low-pressure-grade compressor heat pump circulation is used for wheel gear defrosting of low-temperature evaporators. An intermediate temperature evaporator and a low-temperature evaporator are arranged in each low-pressure-grade unit, wherein the intermediate temperature evaporator is used for achieving intermediate temperature refrigeration, and the low-temperature evaporator is used for achieving low-temperature refrigeration or defrosting. The operation method comprises the steps that when one low-temperature evaporator needs defrosting, through valve switching, a low-pressure-grade compressor having the defrosting function is converted into a high-pressure-grade compressor to operate, the low-pressure-grade compressor in the low-pressure-grade unit achieving the defrosting function sucks a working medium from the low-pressure-grade compressor achieving the refrigeration function, after the working medium is compressed, the working medium condenses to heat the low-temperature evaporator to be defrosted, and then defrosting is achieved; when multiple low-temperature evaporators need defrosting, wheel gear type defrosting is adopted. According to the two-stage-throttling intermediate complete cooling type refrigeration system and the two-stage-throttling intermediate complete cooling type refrigeration system, the defrosting circulation and the refrigeration circulation are both double-grade compression circulations, the temperature fluctuation of a cold storage is small, the structure is simple, and the efficiency is high.

The invention discloses a supercritical carbon dioxide heat supply system for peak-load shifting of distributed energy resources. The supercritical carbon dioxide heat supply system comprises a heat pump and vortex tube system and a heat storage and supply system. According to the supercritical carbon dioxide heat supply system, surplus electric energy generated by the distributed energy resourcessuch as wind energy and solar energy is balanced out through a heat pump and the heat storage system. By means of a vortex tube, the requirement of the system for the compression ratio of a working medium compressor can be greatly lowered; cost is lowered; and practicability of the system is improved. Compared with a common heat pump heat supply system, the supercritical carbon dioxide heat supply system has the obvious beneficial effects that the actual capacity, namely consumption and absorption of the renewable energy sources, of a power grid can be greatly increased; the peak-load shifting effect is achieved; and the system contributes to pollution reduction and environmental protection.

The invention discloses an output power-increased electric heating device. The device comprises a shell, heating pipes, supports, an outflow port and an inflow port, wherein the two ends of the outercircular surface of the shell are correspondingly provided with the outflow port and the inflow port, the heating pipes are installed in the shell, a gap is formed between the end part of each heatingpipe and the end part of the shell, the heating pipes and the inner wall of the shell are fixed through the supports, and the adjacent heating pipes are also fixed through the supports. As a cross-sectional area increases, a heat exchange coefficient and a heat exchange area gradually increase, and heat generated by the heating pipes are more easily transferred to a fluid. A larger electric poweris loaded on the heating pipes of same quality, a heater structure is more compact, and the heat exchange effect is better. Without changing the type of material or increasing an initial speed of aninput fluid working medium, power distribution is changed by changing wall thicknesses of all sections of the heating pipes, so that the overall power distribution is more reasonable, and the purposeof improving a temperature of the fluid working medium is achieved by increasing an overall average temperature.

The embodiment of the invention provides a supercritical gas turbine or expander adopting a low-temperature working medium and a use method, and belongs to the gas turbine or expander with special purposes. The temperature of gas input by a main steam pipeline of the gas turbine needs to be obviously higher than the critical temperature of the low-temperature working medium; the temperature of dead steam output by an exhaust pipeline of the gas turbine needs to reach or be slightly higher than the critical temperature of the low-temperature working medium; the temperature of the working condition area of the gas turbine is always above the critical temperature of the low-temperature working medium; and the exhaust pipeline of the gas turbine is connected with a dead steam heat regenerator,so that low-temperature liquid output by a low-temperature liquid pump condenses the high-temperature dead steam with critical temperature. In addition, the embodiment of the invention further provides a technical method for shaft end sealing through an outer cylinder body of the gas turbine, so that the problem of leakage of two ends of a rotating shaft of a rotating machine such as the gas turbine or the expansion machine is solved, and particularly, the leakage of the expensive low-temperature working media is avoided. The gas turbine or expander has the advantages of compact structure, small size, low cost, large torque force and the like.

The invention discloses a lignite pre-drying supercritical CO2 power generation system and method integrated with a compression heat pump. The lignite pre-drying supercritical CO2 power generation system comprises a supercritical CO2 coal-fired power generation system and a lignite pre-drying system, and the supercritical CO2 coal-fired power generation system comprises a boiler, a main compressor, a re-compressor, a turbine, a low-temperature heat regenerator, a high-temperature heat regenerator and a pre-cooler; the lignite pre-drying system comprises a flow regulating valve, a condenser anda compression type heat pump system; the compression type heat pump system absorbs system cold end waste heat with high temperature, so that the evaporation temperature is improved, power consumptionof the compressor is reduced, and then the performance coefficient of the heat pump is improved; and the condenser in the compression type heat pump system releases heat to achieve the purpose of lignite pre-drying. According to the lignite pre-drying supercritical CO2 power generation system, the compression heat pump is used for converting the system cold end waste heat with higher temperatureto dry lignite, so that on one hand, the cold source loss of the system can be reduced; and on the other hand, moisture in lignite can be reduced, the heat value of the lignite is increased, the boiler efficiency can be improved, the station service power is reduced, and thus the system energy utilization efficiency is greatly improved.

The invention discloses a supercritical carbon dioxide cogeneration system and an operation method. A supercritical carbon dioxide cycle is adopted as a cogeneration power cycle, and an air exhaust-heat supply system is coupled, so that heat energy and electric energy are provided for a user at the same time; and through coupling optimization of a hot end-regeneration-heat supply process, the energy utilization rate of a supercritical carbon dioxide power system can be greatly increased. According to the system, reasonable energy level matching is conducted on air exhaust, and heat supply-airexhaust and a heat regenerative system are coupled, so that heat exchange irreversible losses in the system are reduced, different heat supply load requirements can be met by adjusting the carbon dioxide split ratio of the heat regenerative system, and the operation flexibility of a unit is improved; and the system can increase the temperature of a working medium entering a boiler, reduce the heatexchange temperature difference of a hot end, reduce the irreversible losses and improve the power generation efficiency of the unit while meeting the heat supply temperature.

The invention discloses a supercritical carbon dioxide system achieving thermoelectric decoupling. The supercritical carbon dioxide system mainly comprises a compressor, a first heat supply heat exchanger, a vortex tube, a second heat supply heat exchanger, a heater and a third heat supply heat exchanger. According to the supercritical carbon dioxide system, a thermoelectric unit is combined witha heat pump and vortex tube system, therefore, on one hand, the surplus electric quantity generated by the thermoelectric unit is consumed by the compressor, and on the other hand, by means of the cooling effect of the vortex tube, waste heat of circulating cooling water is absorbed; and efficient heat supply is achieved. By means of the supercritical carbon dioxide system, the energy utilizationrate is increased through the heat pump technology, and meanwhile, the requirement of the system for the compression ratio of the compressor is lowered through the vortex tube technology; practicability of the system is improved; and cost is lowered.

The invention discloses a control method for an air conditioner. The method comprises the steps as follows: after a refrigerant is subjected to heat exchange through an indoor heat exchanger, the refrigerant after heat exchange is controlled to be throttled by a throttling valve to be changed into a gas-liquid mixture; the gas-liquid mixture is controlled through the flow direction of an electromagnetic three-way valve to enter a flash tank; one part of the gas-liquid mixture subjected to flashing by the flash tank is controlled to be throttled by the throttling valve and then subjected to heat exchange through an outdoor heat exchanger to be changed into a gaseous mixture, the gaseous mixture is mixed with the other part of the gas-liquid mixture, and the mixture flows into a compressor. The invention further discloses a control device for the air conditioner and the air conditioner. With the method, the device and the air conditioner, the working medium flowing through the outdoor heat exchanger can be reduced, so that the loss of environmental heat is reduced, the frost quantity is reduced, little heat is lost due to the small frost quantity, then the working medium temperature at the inlet of the compressor is increased, and the indoor heating quantity is increased.

The invention provides a combined drying system based on solar energy. The combined drying system comprises a first circuit, a second circuit and a third circuit. A solar thermal collector, a heat exchanger and a heat pump unit are connected sequentially to form the first circuit, and the first circuit is used for absorbing thermal energy through the solar thermal collector and for providing thermal energy of first temperature and second temperature for the heat exchanger and the heat pump unit correspondingly. The heat exchanger is connected with a high temperature storage tank, a drying subsystem and a low temperature storage tank sequentially correspondingly to form the second circuit, and the second circuit is used for operation that after subjected to heat exchange by the heat exchanger, heat conduction circulation water from the low temperature storage tank is stored in the high temperature storage tank. The heat pump unit is connected with the high temperature storage tank, the drying subsystem and the low temperature storage tank sequentially correspondingly to form the third circuit, and the third circuit is used for operation that after subjected to heat exchange by the heat pump unit, heat conduction circulation water from the low temperature storage tank is stored in the high temperature storage tank. Through the combined drying system, energy utilization efficiency can be improved, and stable operation of the drying process under different solar irradiation conditions is achieved.

A thermal control device adapted to a space nuclear thermal propulsion system, comprising a low-temperature thermal insulation protection structure, a low-temperature hydrogen storage tank, a first heat exchanger, a space power generation module, a radiation radiator and a low-temperature refrigerator. The low-temperature thermal insulation protection structure is wrapped around the cryogenic hydrogen storage tank; the working medium hydrogen in the low-temperature hydrogen storage tank directly enters the nuclear thermal reactor one way, and the other way cools the nuclear thermal engine nozzle before entering the nuclear thermal reactor; the nuclear thermal reactor core The heat in the core is transferred to the first heat exchanger; the first heat exchanger transmits the waste heat of the core to the space power generation module; the space power generation module uses part of the heat to generate electricity, and the remaining heat is transmitted to the radiation radiator for space radiation heat dissipation; the space power generation module The generated electric energy controls the refrigeration of the low-temperature refrigerator to ensure that the working medium in the low-temperature hydrogen storage tank maintains a low-temperature storage state. The invention not only has the advantages of high reliability (no moving parts), good heat transfer and heat dissipation effect, but also has the characteristics of simple structure and comprehensive heat management, and has great application prospects.

The invention discloses a condensing glass evacuated medium-temperature collector tube, which comprises a glass shielding tube, an internal glass tube, a holder and degasifier, selective absorbing coating is coated on the outer wall of the internal glass tube, the internal glass tube is arranged in the glass shielding tube, the bottoms of the internal glass tube and the glass shielding tube are supported by the holder, the open ends of the internal glass tube and the glass shielding tube are welded to be sealed, the interlayer between the internal glass tube and the glass shielding tube is a vacuum layer, the degasifier is arranged on the holder, and a metal reflective condenser is arranged in the vacuum interlayer, and is fixed on the holder. The invention realizes the structural integration of the metal reflective condenser and the a solar evacuated tube, accomplishes the innovation of the a full-glass solar medium-temperature evacuated tube product, and can be applied to solar medium temperature. The condensing glass evacuated medium-temperature collector tube has the advantages of high cost performance and good economic benefit, and is suitable for mass production.

The invention relates to a vane of a stirring type wind power heating start device. The vane of the stirring type wind power heating start device is provided with a turbo type flat vane composed of four blades, wherein holes are punched in the four blades in the turbo type flat vane in staggered mode, and used for decreasing the sweeping area of the vane, enable the stirring type wind power heating start device to normally start under low wind speed, and prevent a wind curtailment phenomenon from occurring. The two holes respectively in each two adjacent blades of the four blades are staggered, wherein one hole is located in the tail of one blade, the other hole is located in the head of the other blade. The sweeping area of the novel vane is decreased, and therefore torque needed for starting a heater of the novel vane is reduced in a starting moment, the problem that large torque is needed in the starting process of the stirring type wind power heating start device is solved, and thestirring type wind power heating start device can normally start under the low wind speed. By punching the holes in the four blades in staggered mode, a heating working medium can be completely stirred, collision and friction frequency between the heating work medium and each stirring blade is increased, and therefore temperature of the working medium is increased, and heating effects are guaranteed.