Wet rubber mixing closed type hot air circulation heat pump hot blast stove and air mixing type hot air circulation heat pump hot blast stove thereof

Abstract

The invention relates to a closed hot air circulation heat pump hot-blast stove for wet rubber mixing and an air mixing type hot air circulation heat pump hot-blast stove thereof, and belongs to the new technical field of energy conservation, carbon reduction, water conservation and environmental protection. The hot air circulation heat pump hot blast stove is composed of a hot air circulation system and a heat pump circulation system. The sizing material drying hot-blast stove utilizes a heat pump as a heating source and is composed of a hot air circulating system and a heat pump circulating system. The hot air circulation system is composed of a return fan, a coarse filtering section, a gas-gas heat regeneration section, a heat pump evaporation dehydration section, a heat pump condensation heating section and a hot air blower. The heat pump system is provided with two evaporators, one evaporator is a finned tube type evaporator in a heat pump evaporation dehydration section and used for absorbing heat from return air cooled through gas-gas backheating and dehumidifying the return air, the other evaporator is a plate type evaporator and used for absorbing heat from cooling circulating water (or solar hot water), and a heat pump compressor is a compressor with the middle steam supplementing and enthalpy increasing function. The heat pump is adopted to dehumidify hot and wet return air, the situation that the hot and wet return air is discharged outwards in the drying process is thoroughly eliminated, energy is saved to the maximum extent, meanwhile, pollution of exhaust air to the atmospheric environment is eliminated, and waste of water resources is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a wet rubber closed hot air circulation heat pump hot air furnace and its mixed air type hot air circulation heat pump hot air furnace, belonging to the field of new energy-saving, carbon-reducing, water-saving and environment-friendly technologies. BACKGROUND

[0002] China is a big country in rubber planting and consumption. The development of rubber industry directly affects the immediate interests of planting farmers and the raw material security of many manufacturing industries in the national economy. In the production of rubber wet mixing (mainly used for preparing carbon black masterbatch), hot air circulating mesh belt dryers are generally used in each section to dehydrate and dry the rubber on the mesh belt, and finally reduce the moisture content of the rubber to less than 1%. Each hot air circulating mesh belt dryer is equipped with a hot air furnace to heat and warm the incoming fresh air and the circulating air of the dryer, forming dry hot air to be sent into the dryer. The hot air furnace is the core equipment of the wet mixing drying system, and the choice of its heat source directly affects the drying efficiency, product quality, operating cost and environmental compliance. At present, the main heat sources are as follows: (1) natural gas direct combustion type, which is the most popular and recommended heat source. After mixing natural gas and combustion air in proportion, it is fully burned in the burner, producing high-temperature clean flue gas (about 1000-1200℃) which is mixed with a large amount of circulating hot air. The mixed gas is adjusted to the required temperature (usually between 60-120℃) and directly sent into the drying box to dry the rubber. Its advantages: high thermal efficiency, direct use of sensible heat of flue gas, no heat exchange loss, thermal efficiency can reach more than 90%; through adjusting the proportion of gas and air volume, rapid, sensitive and accurate temperature control can be realized to ensure stable product quality; simple equipment, no need for complex heat exchange device, relatively simple system structure; environmentally clean, natural gas is a clean energy, the combustion products are mainly CO2 and H2O, almost no sulfide, dust and other pollutants, no pollution to rubber. Disadvantages: affected by natural gas price fluctuations, cost is relatively high in areas with high gas prices; need to lay natural gas pipeline, application conditions are limited in some areas. (2) Fuel oil (diesel oil / heavy oil) direct combustion type, which has similar principle to natural gas direct combustion. Advantages: high calorific value of fuel oil, can provide sufficient heat; not limited by pipeline gas, can use oil tank for supply, application is more flexible. Disadvantages: pollution risk: especially when burning heavy oil, if combustion is not sufficient or oil quality is poor, it is easy to produce sulfide, unburned carbon particles, etc., which may pollute the rubber and affect the product quality (such as color, purity); high environmental pressure, the exhaust gas contains SO2, NOx, etc., which need to be treated to meet environmental requirements; complex operation and maintenance, need fuel oil delivery, filtration, preheating (heavy oil) system, burner maintenance frequency is higher. Due to environmental and product quality requirements, fuel oil (diesel oil / heavy oil) is rarely used in new production lines, especially not for direct combustion, but more as a backup heat source or used in specific areas. (3) Indirect heating type of coal / biomass particles, coal or biomass particles are burned in a boiler to heat the heat transfer oil (heat transfer oil furnace) or produce steam (steam boiler). High-temperature heat transfer oil or steam passes through a coil or shell heat exchanger to exchange heat with clean air, thereby producing clean dry hot air.Advantages: low fuel cost: the price of coal and biomass particles is much lower than that of natural gas and oil, and the operation cost advantage is obvious in certain areas (biomass particles need to consider the source and stability). Disadvantages: complex system, need boiler, heat exchanger, water pump / oil pump and other systems, large initial investment. Low thermal efficiency, after two heat exchanges, large energy loss, overall thermal efficiency is usually lower than that of direct combustion. Slow response, large thermal inertia of heat conducting oil or steam system, temperature regulation lag, control accuracy is not as good as direct combustion. Environmental protection problem, the environmental protection pressure of coal-fired boiler is huge, which needs to be matched with complex dust removal, desulfurization and denitrification equipment. Even for biomass boiler, there are emission management problems; large floor area. Due to the increasingly strict environmental protection policy, the modernized rubber refining production line basically does not use coal-fired method. Biomass particle furnace is applied in some areas where environmental protection requirements are allowed and fuel supply is stable. (4) Electric heating type, which uses electric energy to heat dry air through resistance wire or electric heating pipe. Advantages: absolutely no pollution, hot air is pure, and has no negative effect on product quality; extremely accurate temperature control can be achieved through silicon controlled elements. Simple equipment, no need for burners, flues, etc., compact structure, high automation. Disadvantages: extremely high operating cost, usually 2-3 times or even higher than that of natural gas; high energy consumption, not in line with the national "double carbon" energy saving policy; high-power drying furnace has high requirements for power grid load. Usually only used for small experimental lines, pilot lines or special occasions with extremely high product cleanliness, and rarely used in large-scale industrial production due to cost problems.

[0003] In the above-mentioned circulating hot air drying systems, in order to maintain the drying capacity of the hot air, a certain amount of outdoor low-temperature air must be introduced to heat the dry hot air while a certain amount of wet hot exhaust gas is discharged, thereby causing large energy loss and environmental pollution. SUMMARY

[0004] In view of the problems and deficiencies of the prior art, the present application provides a wet rubber refining closed hot air circulating heat pump hot air furnace and a mixed air type hot air circulating heat pump hot air furnace. The rubber drying hot air furnace of the present application uses a heat pump as a heating source and is composed of a hot air circulating system and a heat pump circulating system. The hot air circulating system is composed of a return air fan, a coarse filter section, a gas-air heat recovery section, a heat pump evaporation and dehydration section, a heat pump condensation and heating section, and a hot air blower. The heat pump system is provided with two evaporators, one being a finned tube evaporator in the heat pump evaporation and dehydration section, which is used to absorb heat from the return air after gas-air heat recovery to dehumidify the return air, and the other being a plate evaporator, which absorbs heat from the cooling circulating water (or solar hot water), and the heat pump compressor adopts a compressor with intermediate steam supplement and enthalpy increase. The present application uses a heat pump to dehumidify hot and humid return air, completely eliminating the discharge of hot and humid return air during the drying process, saving energy to the maximum, eliminating air pollution caused by exhaust air, and reducing water resource waste.

[0005] The present application is realized by the following technical solutions.

[0006] A wet rubber refining closed hot air circulation heat pump hot air furnace is composed of a hot air circulation system and a heat pump circulation system. The hot air circulation system includes functional sections: a heat pump condenser 2, a finned tube evaporator 10, a return air fan 12, a supply air fan 13, an air return air section 14, and a coarse filter 15; and the heat pump circulation system includes functional sections: a heat pump compressor 1, the heat pump condenser 2, a liquid storage tank 3, a drying filter 4, an electromagnetic valve I 5, an expansion valve I 6, a plate evaporator 7, an electromagnetic valve II 8, an expansion valve II 9, the finned tube evaporator 10, and a gas-liquid separator 11. The wet hot return air from the rubber web belt dryer return air outlet in the hot air circulation system is pressurized by the return air fan 12 and then filtered by the coarse filter 15, and then flows into the air return air section 14 wet hot return air inlet, the air return air section 14 wet hot return air outlet is connected to the finned tube evaporator 10 pipe outside inlet, the finned tube evaporator 10 pipe outside dehumidified return air outlet is connected to the air return air section 14 cold side inlet, the air return air section 14 preheated return air outlet is connected to the heat pump condenser 2 pipe outside inlet, and the dry hot supply air from the heat pump condenser 2 pipe outside outlet is pressurized by the supply air fan 13 and then sent into the web belt dryer, completing a hot air circulation. In the heat pump circulation system, the high-temperature and high-pressure working medium vapor outlet of the heat pump compressor 1 is connected to the high-temperature inlet of the heat pump condenser 2, the condensing working medium outlet of the heat pump condenser 2 is connected to the liquid storage tank 3, and the liquid storage tank 3 is connected to the drying filter 4. After being filtered, the liquid storage tank 3 is divided into two paths: one path flows into the expansion valve I 6 and the plate evaporator 7 in sequence after passing through the electromagnetic valve I 5, and the low-pressure gaseous working medium outlet of the plate evaporator 7 is connected to the intermediate steam supplement inlet of the heat pump compressor 1; the other path flows into the finned tube evaporator 10 heat absorption inlet in sequence after passing through the electromagnetic valve II 8 and the expansion valve II 9, and the low-pressure gaseous working medium outlet of the finned tube evaporator 10 is connected to the gas-liquid separator 11. After being compressed, the mixed gas is discharged into the high-temperature inlet of the heat pump condenser 2 through the compressed high-temperature and high-pressure working medium vapor outlet, completing a heat pump circulation.

[0007] The dehydrated return air with a lower temperature at the finned tube evaporator 10 pipe outside dehumidified return air outlet needs to be connected to the air return air section 14 cold side inlet through an insulating air pipe.

[0008] The steam pressure of the working medium in the finned tube evaporator 10 is lower than that in the plate evaporator 7.

[0009] The working medium adopts HFCS, HFOS, mixed working medium or natural working medium. (1) HFCS, such as R245fa, R134a; (2) HFOS, such as R1233zd(E), R1336mzz(Z), R1234ze(Z); (3) mixed working medium, such as R515B (a mixture of R1234ze(E) / R227ea), R466A (a mixture of R32 / R125 / CF3I); (4) natural working medium, such as R744 (carbon dioxide), R717 (ammonia), R290 (propane) and R1270 (propylene) and the like.

[0010] The hot water inlet of the plate evaporator 7 is connected with cooling circulating water or hot water of a solar heat collector.

[0011] A wet rubber refining closed mixed air type hot air circulating heat pump hot air furnace, which is composed of a hot air circulating system and a heat pump circulating system; The hot air circulating system includes functional sections: a heat pump condenser 2, a finned tube evaporator 10, a return air fan 12, a supply air fan 13, an air return air section 14, a coarse filter 15, a return air regulating valve 16 and a mixed air section 17; the heat pump circulating system includes functional sections: a heat pump compressor 1, the heat pump condenser 2, a liquid storage tank 3, a dry filter 4, an electromagnetic valve I 5, an expansion valve I 6, a plate evaporator 7, an electromagnetic valve II 8, an expansion valve II 9, the finned tube evaporator 10 and an air-liquid separator 11; In the hot air circulating system, the wet hot return air from the rubber material mesh belt dryer return air outlet is pressurized by the return air fan 12 and then enters the coarse filter 15 to be filtered into two paths: one path flows into the air-return air section 14 wet hot return air inlet, the air-return air section 14 wet hot return air outlet is connected with the finned tube evaporator 10 pipe outside inlet, the finned tube evaporator 10 pipe outside dehumidified return air outlet is connected with the air-return air section 14 cold side inlet, and the air-return air section 14 preheated return air outlet is connected to the mixed air section 17; the other path enters the mixed air section 17 through the return air regulating valve 16, the two paths of air are mixed to form supply air, the mixed air section 17 outlet is connected with the heat pump condenser 2 pipe outside inlet, and the dry hot supply air of the heat pump condenser 2 pipe outside outlet is pressurized by the supply air fan 13 and then sent into the mesh belt dryer, to complete one hot air circulation; The high-temperature and high-pressure working medium vapor outlet of the heat pump compressor 1 in the heat pump circulation system is connected to the high-temperature inlet of the heat pump condenser 2, the condensed working medium outlet of the heat pump condenser 2 is connected to the liquid storage tank 3, the liquid storage tank 3 is connected to the dry filter 4, and the filtered working medium is divided into two paths: one path flows into the expansion valve I 6 and the plate evaporator 7 in sequence through the electromagnetic valve I 5, and the low-pressure gaseous working medium outlet of the plate evaporator 7 is connected to the intermediate steam supplement inlet of the heat pump compressor 1; the other path flows into the finned tube evaporator 10 through the electromagnetic valve II 8 and the expansion valve II 9 in sequence, and the low-pressure gaseous working medium outlet of the finned tube evaporator 10 is connected to the gas-liquid separator 11, and the mixed gas is discharged into the high-temperature inlet of the heat pump condenser 2 through the high-temperature and high-pressure working medium vapor outlet after compression, to complete one heat pump circulation.

[0012] The above-mentioned method uses only part of the return air to be cooled and dehumidified by the heat pump evaporation and dehydration section 10, and the dry air after dehumidification is mixed with the return air in a certain proportion to achieve the required humidity of the supply air.

[0013] The water evaporated during the drying of the rubber material is recovered by the heat pump evaporation and dehydration section 10, reducing the waste of water resources.

[0014] The working principle of the closed heat pump hot air furnace for wet rubber refining is as follows: The hot air circulation system: the wet and hot return air from the rubber material net belt dryer outlet is pressurized by the return air fan 12 and sent to the coarse efficiency filter 15 for purification, filtering out the solid particles in the return air, and the clean air after filtration flows into the gas-air return air section 14 and exchanges heat with the dehumidified return air with a lower temperature on the cold side, and the temperature of the wet and hot return air decreases after flowing out of the gas-air return air section 14 and entering the outside of the finned tube evaporation section 10. Because the evaporation temperature inside the tube is lower than the dew point of the wet and hot return air, the temperature of the wet and hot return air decreases to below the dew point, and dew forms on the outer wall of the tube and the fin surface, thereby reducing the water vapor content in the wet and hot return air to the supply air state. The return air after dehydration flows out of the finned tube evaporation section 10 and is sent to the cold side of the gas-air return air section 14 through the heat preservation air pipe to exchange heat with the wet and hot return air on the hot side. In the gas-air return air section 14, the wet and hot return air on the hot side transmits heat to the return air after dehydration on the cold side, and the temperature of the wet and hot return air decreases. The gas-air return air section 14 reduces the heat transfer area of the finned tube evaporation section 10, and also preheats the return air after dehydration, reducing the heat transfer area of the heat pump condensing and heating section 2, thereby also reducing the load of the heat pump compressor 1. The return air preheated by the gas-air return air section 14 enters the outside of the heat pump condensing and heating section 2 to absorb the heat of the high-temperature working medium outside the tube, and is heated by the heat pump condensing and heating section 2 to a dry and hot supply air with a required temperature, which is finally pressurized by the supply air fan 13 and sent to the net belt dryer, to complete one hot air circulation.

[0015] The high-temperature and high-pressure working medium vapor from the compressor 1 flows into the heat pump condenser 2, the high-temperature working medium flowing in the pipe transfers heat to the return air with lower temperature outside the pipe, the working medium in the pipe is condensed, the high-pressure liquid heat pump working medium flows into the liquid storage tank 3 for storage, then passes through the dry filter 4 to remove solid impurities and moisture in the liquid working medium, and the liquid working medium flows out of the dry filter 4 and is divided into two paths: one path flows into the expansion valve I 6 through the electromagnetic valve I 5, the low-temperature and low-pressure liquid working medium (with a small amount of flash gas) after being throttled and depressurized to the design pressure by the expansion valve I 6 flows into the plate evaporator 7 to absorb the heat of the factory cooling water or solar hot water, the low-temperature liquid refrigerant evaporates into low-pressure gaseous working medium, and the low-pressure gaseous working medium flows into the middle steam supplement port of the compressor 1; the other path flows into the expansion valve II 9 through the electromagnetic valve II 8, the low-temperature and low-pressure liquid working medium (with a small amount of flash gas) after being throttled and depressurized to the design pressure by the expansion valve II 9 flows into the finned tube evaporator 10 to absorb the heat of the return air outside the pipe, the low-temperature liquid refrigerant evaporates into low-pressure gaseous working medium, and the low-pressure gaseous working medium flows into the low-pressure steam inlet of the compressor 1, is compressed by one stage, is mixed with the middle steam supplement, and is discharged from the high-temperature and high-pressure working medium vapor outlet of the compressor 1, completing one heat pump cycle. Since the humid and hot return air needs to be cooled and dehydrated, the vapor pressure of the working medium in the finned tube evaporator 10 is lower than that in the plate evaporator 7, and in order to improve the heat pump performance system, an intermediate steam supplement type heat pump cycle is adopted. In addition, the electromagnetic valve I 5 and the electromagnetic valve II 8 are set to be closed in sequence when the machine is stopped, so as to avoid the liquid working medium flowing into the evaporator, thereby causing the compressor inlet to carry liquid and affecting the safe operation of the compressor.

[0016] The working principle of the closed mixed air type hot air circulating heat pump hot air furnace for wet rubber refining is as follows: The hot air circulation system: the wet hot return air from the rubber material net belt dryer return air outlet is sent into the coarse efficiency filter 15 after being pressurized by the return air fan 12, and the solid particles in the return air are filtered out. The clean air after filtration is divided into two paths: one path of return air flows into the air-return air section 14 to exchange heat with the air of lower temperature on the cold side, and the wet hot return air is cooled and flows out of the air-return air section 14, enters the outside of the finned tube evaporating section 10, and the temperature of the wet hot return air is reduced to below the dew point because the evaporation temperature in the tube is lower than the dew point of the wet hot return air. When the temperature of the wet hot return air is reduced to below the dew point, dew is formed on the outer wall of the tube and the surface of the fin, thereby reducing the water vapor content in the wet hot return air to the design state. The return air after dehydration flows out of the finned tube evaporating section 10, and is sent to the cold side of the air-return air section 14 through the air pipe (which needs to be insulated) to exchange heat with the wet hot return air on the hot side. In the air-return air section 14, the wet hot return air on the hot side exchanges heat with the return air after dehydration (which has a lower temperature), and the temperature of the wet hot return air is reduced. The air-return air section 14 is provided to reduce the heat transfer area of the finned tube evaporating section 10, and also preheats the return air after dehydration, thereby reducing the heat transfer area of the heat pump condensing heating section 2, and thus the load of the heat pump compressor 1. The return air after preheating in the air-return air section 14 is sent into the drying circulation return air inlet of the air mixing section 17 through the pipeline. The other path of return air is adjusted to the required flow rate by the return air adjusting valve 16, and then enters the circulation return air inlet of the air mixing section 17. The return air after dehydration and preheating is mixed with the circulation return air in the air mixing section 17 according to a certain proportion, and the humidity content of the mixed air reaches the requirement of the supply air. The mixed air is then heated by the heat pump condensing heating section 2 to a dry hot supply air with a required temperature, and finally is pressurized by the supply air fan 13 and sent into the net belt dryer, thereby completing a hot air circulation.

[0017] The high-temperature and high-pressure working medium vapor from the compressor 1 flows into the heat pump condenser 2, the high-temperature working medium flowing in the pipe transfers heat to the air with lower temperature outside the pipe, the working medium in the pipe is condensed, the high-pressure liquid heat pump working medium flows into the liquid storage tank 3 for storage, then passes through the dry filter 4 to remove the solid impurities and moisture in the liquid working medium, and then is divided into two ways: one way flows into the expansion valve I 6 through the electromagnetic valve I 5, the low-temperature and low-pressure liquid working medium (with a small amount of flash gas) after being throttled and reduced in pressure by the expansion valve I 6 flows into the plate evaporator 7 to absorb the heat of the cooling water or solar hot water, the low-temperature liquid refrigerant is evaporated into low-pressure gaseous working medium, and then the low-pressure gaseous working medium flows into the middle steam supplement port of the compressor 1; the other way flows into the expansion valve II 9 through the electromagnetic valve II 8, the low-temperature and low-pressure liquid working medium (with a small amount of flash gas) after being throttled and reduced in pressure by the expansion valve II 9 flows into the finned tube evaporator 10 to absorb the heat of the return air, the low-temperature liquid refrigerant is evaporated into low-pressure gaseous working medium, and then the low-pressure gaseous working medium flows into the low-pressure steam inlet of the compressor 1 after removing the liquid by the gas-liquid separator 11, is compressed by the compressor 1, is mixed with the middle steam supplement, and is discharged from the high-temperature and high-pressure working medium vapor outlet of the compressor 1, so as to complete one heat pump cycle. Since the humid and hot return air needs to be cooled and dehydrated, the steam pressure of the working medium in the finned tube evaporator 10 is lower than that in the plate evaporator 7, and the intermediate steam supplement type heat pump cycle is adopted to improve the performance of the heat pump system. In addition, the electromagnetic valve I 5 and the electromagnetic valve II 8 are arranged to be closed in series when the machine is stopped, so as to avoid the liquid working medium flowing into the evaporator, thereby avoiding the liquid in the inlet of the compressor and affecting the safe operation of the compressor.

[0018] The beneficial effects of the present application are: (1) The present application can realize the full-closed operation of the drying hot air system, and eliminates the pollution of the exhaust air to the environment.

[0019] (2) The present application adopts the steam compression type heat pump with intermediate steam supplement, can recover the waste heat of the humid and hot return air of the net belt dryer and the heat of the circulating cooling water or solar hot water of the factory area, can improve the performance of the heat pump system, reduce the power consumption of the heat supply, and reduce the power consumption of the circulating water cooling tower of the factory area.

[0020] (3) The present application can recover the water evaporated in the drying process of the rubber compound, and save the waste of water resources.

[0021] (4) The present application can realize the modularization of each functional section of the hot blast furnace, realize the standardized production, reduce the equipment cost, and facilitate the on-site installation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the closed heat pump hot blast furnace diagram of the wet rubber refining of the present application; Figure 2This is a diagram of the wet rubber refining closed-loop mixed-air hot air circulation heat pump hot air furnace of the present invention.

[0023] In the diagram: 1-Heat pump compressor, 2-Heat pump condenser, 3-Liquid receiver, 4-Dryer filter, 5-Solenoid valve I, 6-Expansion valve I, 7-Plate evaporator, 8-Solenoid valve II, 9-Expansion valve II, 10-Finned tube evaporator, 11-Gas-liquid separator, 12-Return air fan, 13-Supply air fan, 14-Gas-to-gas return air section, 15-Coarse filter, 16-Return air regulating valve, 17-Mixing section. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1 like Figure 1 As shown, the wet rubber compounding closed-loop hot air circulation heat pump hot air furnace consists of a hot air circulation system and a heat pump circulation system. The hot air circulation system includes the following functional sections: heat pump condenser 2, finned tube evaporator 10, return air fan 12, supply air fan 13, gas-to-gas return air section 14, and coarse filter 15; the heat pump circulation system includes the following functional sections: heat pump compressor 1, heat pump condenser 2, liquid receiver 3, dryer filter 4, solenoid valve I 5, expansion valve I 6, plate evaporator 7, solenoid valve II 8, expansion valve II 9, finned tube evaporator 10, and gas-liquid separator 11; In the hot air circulation system, the hot and humid return air from the return air outlet of the rubber mesh belt dryer is pressurized by the return air fan 12 and then filtered by the coarse filter 15. It then flows into the hot and humid return air inlet of the air-to-air return air section 14. The hot and humid return air outlet of the air-to-air return air section 14 is connected to the outer inlet of the finned tube evaporator 10. The outer dehumidified return air outlet of the finned tube evaporator 10 is connected to the cold side inlet of the air-to-air return air section 14. The preheated return air outlet of the air-to-air return air section 14 is connected to the outer inlet of the heat pump condenser 2. The dry and hot air from the outer outlet of the heat pump condenser 2 is pressurized by the blower 13 and sent into the mesh belt dryer to complete one hot air cycle. In the heat pump cycle system, the high-temperature and high-pressure working fluid vapor outlet of the heat pump compressor 1 is connected to the high-temperature inlet of the heat pump condenser 2. The condensing working fluid outlet of the heat pump condenser 2 is connected to the liquid storage tank 3. The liquid storage tank 3 is connected to the dryer filter 4, and after filtration, it is divided into two paths: one path flows through the solenoid valve I5 and then sequentially into the expansion valve I6 and the plate evaporator 7. The low-pressure gaseous working fluid outlet of the plate evaporator 7 is connected to the intermediate steam injection port of the heat pump compressor 1. The other path flows through the solenoid valve II8 and the expansion valve II9 sequentially into the heat absorption inlet of the finned tube evaporator 10. The low-pressure gaseous working fluid outlet of the finned tube evaporator 10 is connected to the gas-liquid separator 11, where it is compressed and mixed with the intermediate steam injection. The mixed gas is then compressed again through the high-temperature and high-pressure working fluid vapor outlet and discharged into the high-temperature inlet of the heat pump condenser 2, completing one heat pump cycle.

[0026] Wherein the dehydrated temperature of the return air from the outside of the finned tube evaporator 10 is lower, and the return air needs to be connected to the air-gas return air section 14 cold side inlet through the heat preservation air pipe.

[0027] Wherein the steam pressure of the working medium in the finned tube evaporator 10 is lower than that in the plate evaporator 7.

[0028] Wherein the working medium is R1233zd(E).

[0029] Wherein the hot water inlet of the plate evaporator 7 is connected to the cooling circulating water or the hot water of the solar collector.

[0030] The above-mentioned hot air circulation system box adopts a sandwich steel plate, and the sandwich material is a thermal insulation material such as polystyrene board, polyvinyl chloride foam board, and polyurethane board. The hot air circulation system air pipe and the working medium circulation pipeline of the heat pump circulation system are well insulated.

[0031] Example 2 As shown in Figure 2 A wet rubber refining closed mixed air type hot air circulation heat pump hot air furnace, which is composed of a hot air circulation system and a heat pump circulation system; The hot air circulation system includes functional sections: heat pump condenser 2, finned tube evaporator 10, return air fan 12, air supply fan 13, air-gas return air section 14, coarse filter 15, return air regulating valve 16, and mixed air section 17. The heat pump circulation system includes functional sections: heat pump compressor 1, heat pump condenser 2, liquid storage tank 3, dry filter 4, electromagnetic valve I 5, expansion valve I 6, plate evaporator 7, electromagnetic valve II 8, expansion valve II 9, finned tube evaporator 10, and gas-liquid separator 11. The wet hot return air from the rubber material mesh belt dryer return air outlet in the hot air circulation system is pressurized by the return air fan 12 and then enters the coarse filter 15 to be filtered into two paths: one path flows into the air-gas return air section 14 wet hot return air inlet, the air-gas return air section 14 wet hot return air outlet is connected to the finned tube evaporator 10 outside inlet, the finned tube evaporator 10 outside dehumidified return air outlet is connected to the air-gas return air section 14 cold side inlet, and the air-gas return air section 14 preheated return air outlet is connected to the mixed air section 17; the other path enters the mixed air section 17 through the return air regulating valve 16, the two paths of air are mixed to form the air supply, and the mixed air section 17 outlet is connected to the heat pump condenser 2 outside inlet. The dry hot air supply from the heat pump condenser 2 outside outlet is pressurized by the air supply fan 13 and sent into the mesh belt dryer, completing a hot air circulation. The high-temperature and high-pressure working medium vapor outlet of the heat pump compressor 1 in the heat pump circulation system is connected to the high-temperature inlet of the heat pump condenser 2, the condensing working medium outlet of the heat pump condenser 2 is connected to the liquid storage tank 3, the liquid storage tank 3 is connected to the dry filter 4, and after being filtered, the dry filter 4 is divided into two paths: one path flows into the expansion valve I 6 and the plate evaporator 7 in sequence through the electromagnetic valve I 5, and the low-pressure gaseous working medium outlet of the plate evaporator 7 is connected to the intermediate steam supplement inlet of the heat pump compressor 1; the other path flows into the finned tube evaporator 10 heat absorption inlet in sequence through the electromagnetic valve II 8 and the expansion valve II 9, and the low-pressure gaseous working medium outlet of the finned tube evaporator 10 is connected to the gas-liquid separator 11, and after being compressed, the mixed gas is discharged into the high-temperature inlet of the heat pump condenser 2 through the high-temperature and high-pressure working medium vapor outlet, to complete one heat pump cycle.

[0032] The dehydrated and low-temperature return air at the dehumidification return air outlet of the outer side of the finned tube evaporator 10 is connected to the cold side inlet of the gas-liquid return air section 14 through the heat preservation air pipe.

[0033] The steam pressure of the working medium in the finned tube evaporator 10 is lower than that in the plate evaporator 7.

[0034] The working medium adopts R515B (a mixture of R1234ze(E) and R227ea).

[0035] The hot water inlet in the plate evaporator 7 is connected to the cooling circulating water or the hot water of the solar heat collector.

[0036] The box body of the above-mentioned hot air circulation system adopts a sandwich steel plate, and the sandwich material is a thermal insulation material such as a polystyrene board, a polyvinyl chloride foam board, a polyurethane board, etc. The air pipe of the hot air circulation system and the working medium circulation pipeline of the heat pump circulation system are well insulated.

[0037] The specific embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A closed-loop hot air circulation heat pump furnace for wet rubber mixing, characterized in that: It consists of a hot air circulation system and a heat pump circulation system; The hot air circulation system includes the following functional sections: heat pump condenser (2), finned tube evaporator (10), return air fan (12), supply air fan (13), gas-to-gas return air section (14), and coarse filter (15); the heat pump circulation system includes the following functional sections: heat pump compressor (1), heat pump condenser (2), liquid storage tank (3), dryer filter (4), solenoid valve I (5), expansion valve I (6), plate evaporator (7), solenoid valve II (8), expansion valve II (9), finned tube evaporator (10), and gas-liquid separator (11); The hot air circulation system is described above. The hot and humid return air from the return air outlet of the rubber mesh belt dryer is pressurized by the return air fan (12) and then enters the coarse filter (15) for filtration. It then flows into the hot and humid return air inlet of the air-to-air return air section (14). The hot and humid return air outlet of the air-to-air return air section (14) is connected to the outer inlet of the finned tube evaporator (10). The dehumidified return air outlet of the finned tube evaporator (10) is connected to the cold side inlet of the air-to-air return air section (14). The preheated return air outlet of the air-to-air return air section (14) is connected to the outer inlet of the heat pump condenser (2). The dry and hot air from the outer outlet of the heat pump condenser (2) is pressurized by the blower (13) and sent into the mesh belt dryer to complete one hot air cycle. In the heat pump cycle system, the high-temperature and high-pressure working fluid vapor outlet of the heat pump compressor (1) is connected to the high-temperature inlet of the heat pump condenser (2), and the condensing working fluid outlet of the heat pump condenser (2) is connected to the liquid storage tank (3). The liquid storage tank (3) is connected to the dryer filter (4) and filtered into two paths: one path flows through the solenoid valve I (5) and then into the expansion valve I (6) and the plate evaporator (7). The low-pressure gaseous working fluid outlet of the plate evaporator (7) is connected to the intermediate steam injection port of the heat pump compressor (1); the other path flows through the solenoid valve II (8) and the expansion valve II (9) and then into the heat absorption inlet of the finned tube evaporator (10). The low-pressure gaseous working fluid outlet of the finned tube evaporator (10) is connected to the gas-liquid separator (11), compressed and mixed with the intermediate steam injection. The mixed gas is then compressed through the high-temperature and high-pressure working fluid vapor outlet and discharged into the high-temperature inlet of the heat pump condenser (2) to complete one heat pump cycle.

2. The wet rubber compounding closed-loop hot air circulation heat pump furnace according to claim 1, characterized in that: The dehydrated return air at the outer dehumidification return air outlet of the finned tube evaporator (10) with a lower temperature needs to be connected to the cold side inlet of the gas-to-gas return air section (14) by an insulated air duct.

3. The closed-loop hot air circulation heat pump furnace for wet rubber compounding according to claim 1, characterized in that: The working fluid has a lower vapor pressure in the finned tube evaporator (10) than in the plate evaporator (7).

4. The wet rubber compounding closed-loop hot air circulation heat pump hot air furnace according to claim 3, characterized in that: The working medium can be of the HFCS type, HFOS type, mixed working medium, or natural working medium.

5. The closed-loop hot air circulation heat pump furnace for wet rubber compounding according to claim 1, characterized in that: The hot water inlet of the plate evaporator (7) is connected to cooling circulating water or hot water from a solar collector.

6. A closed-loop mixed-air type hot air circulation heat pump furnace for wet rubber mixing, characterized in that: It consists of a hot air circulation system and a heat pump circulation system; The hot air circulation system includes the following functional sections: heat pump condenser (2), finned tube evaporator (10), return air fan (12), supply air fan (13), gas-to-gas return air section (14), coarse filter (15), return air regulating valve (16) and mixing air section (17); the heat pump circulation system includes the following functional sections: heat pump compressor (1), heat pump condenser (2), liquid storage tank (3), dryer filter (4), solenoid valve I (5), expansion valve I (6), plate evaporator (7), solenoid valve II (8), expansion valve II (9), finned tube evaporator (10) and gas-liquid separator (11); The hot air circulation system is described above. The hot and humid return air from the return air outlet of the rubber mesh belt dryer is pressurized by the return air fan (12) and then enters the coarse filter (15) for filtration and is divided into two paths: one path flows into the hot and humid return air inlet of the air-to-air return air section (14), the hot and humid return air outlet of the air-to-air return air section (14) is connected to the outer inlet of the finned tube evaporator (10), the outer dehumidified return air outlet of the finned tube evaporator (10) is connected to the cold side inlet of the air-to-air return air section (14), and the preheated return air outlet of the air-to-air return air section (14) is connected to the mixing section (17); the other path enters the mixing section (17) through the return air regulating valve (16), and the two paths of air are mixed to form the supply air. The outlet of the mixing section (17) is connected to the outer inlet of the heat pump condenser (2), and the dry and hot supply air from the outer outlet of the heat pump condenser (2) is pressurized by the blower (13) and sent into the mesh belt dryer to complete one hot air cycle. In the heat pump cycle system, the high-temperature and high-pressure working fluid vapor outlet of the heat pump compressor (1) is connected to the high-temperature inlet of the heat pump condenser (2), and the condensing working fluid outlet of the heat pump condenser (2) is connected to the liquid storage tank (3). The liquid storage tank (3) is connected to the dryer filter (4) and filtered into two paths: one path flows through the solenoid valve I (5) and then into the expansion valve I (6) and the plate evaporator (7). The low-pressure gaseous working fluid outlet of the plate evaporator (7) is connected to the intermediate steam injection port of the heat pump compressor (1); the other path flows through the solenoid valve II (8) and the expansion valve II (9) and then into the heat absorption inlet of the finned tube evaporator (10). The low-pressure gaseous working fluid outlet of the finned tube evaporator (10) is connected to the gas-liquid separator (11), compressed and mixed with the intermediate steam injection. The mixed gas is then compressed through the high-temperature and high-pressure working fluid vapor outlet and discharged into the high-temperature inlet of the heat pump condenser (2) to complete one heat pump cycle.

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