A tobacco leaf curing system based on geothermal energy

Abstract

The present application relates to a kind of tobacco curing system based on geothermal energy, including geothermal water circulation system, organic rankine cycle system, heat pump system, curing system and auxiliary system, organic rankine cycle system is formed by first evaporator, turbine, first condenser and organic medium circulating pump in series, first evaporator is connected in series in geothermal water circulation system;Heat pump system is formed by second evaporator, throttling component, second condenser and compressor in series, turbine and compressor are drivingly connected;Curing system is formed by cooler, evaporator and second condenser in series between the air inlet and outlet of tobacco chamber;Auxiliary system includes the cooling device for cooling cooler and first condenser.This system utilizes geothermal energy, energy saving and environmental protection, low operating cost, wide application area, especially suitable for power supply facilities weak, altitude higher humidity greater tobacco curing area, help to reduce tobacco curing cost, improve curing efficiency and tobacco quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tobacco leaf curing technology, in particular to a tobacco leaf curing system based on geothermal energy. BACKGROUND

[0002] As a traditional high-energy-consuming industry, in order to achieve low-carbon and green development, a series of technological innovations have been introduced in recent years. Among them, the popularization of heat pump curing technology has realized the increase of tobacco leaf curing quantity and quality. However, some problems have been encountered in the popularization process of this technology. For example, air heat pump curing technology consumes a large amount of electricity and has high operating costs. In mountainous areas, the power infrastructure is relatively weak, and the power grid load is low. Large-scale promotion of heat pump technology will impact the power grid load, and in severe cases, it will cause the power grid to stop. In addition, the weather changes rapidly in summer and autumn in mountainous areas, with strong winds and heavy rains, and the power grid often trips or is temporarily powered off, which brings great inconvenience to the tobacco leaf curing industry. Furthermore, the humidity in high-altitude areas is high, which affects the moisture content of tobacco leaves. In a high-humidity environment, the water in the tobacco leaves is difficult to be discharged in time during the curing process, causing the upper shelf tobacco leaves to rot and seriously affecting the quality of the cured tobacco leaves. Moreover, high-moisture tobacco leaves will produce more water vapor during the curing process, which will slow down the curing speed of the tobacco leaves and react with nicotine and other substances in the tobacco leaves to form ash smoke.

[0003] In the existing published patent documents:

[0004] (1) The patent document with the application publication number CN117413954A, named "Intelligent control of tobacco house latent heat recovery heat pump drying system", includes an evaporator, a condenser, a compressor, a hot air chamber indoor unit, a hot air chamber outdoor unit and a controller, etc. This system reduces the dehumidification load and fresh air load of circulating air, and realizes the energy-saving operation of circulating air dehumidification and reheating during the tobacco curing process. It also increases the intelligent control system, realizes the intelligent control operation of the whole tobacco curing process, and the intelligent control system can make intelligent adjustments in real time according to the changes in tobacco curing and the effects of the curing environment. However, this system is based on electricity, and excessive installation will have a greater impact on the power grid in remote areas. In addition, a set of heat pump device needs to be configured for a single drying system, which has a high investment cost and low safety redundancy.

[0005] (2) The patent document with the application publication number CN117322663A, named "Baking device for intelligently adjusting temperature and humidity", uses the main fan to draw external air into the first channel through the humidity adjustment channel for heat exchange, and the air sent by the first channel is heated through the heating channel and then sent into the baking house through the flow equalization channel. The invention not only provides dry hot air in the baking house to dry the tobacco quickly during baking, but also provides humid hot air with a certain humidity during the yellowing stage of tobacco baking. However, in order to achieve humidity adjustment, the device increases many mechanical structures, the overall structure and volume are relatively bulky, the operation complexity of the device is increased, and the specific effect of temperature and humidity adjustment still needs to be considered.

[0006] (3) The patent document with the granted publication number CN114532567B, named "Dense baking house structure and gas-water separation and wet ball temperature control method", in which the upper part of the fan chamber is provided with a gas-water separation device, and the gas-water separation device includes a main machine, an air inlet channel and an air outlet channel arranged on the air inlet and air outlet of the main machine. The air inlet channel is connected with the first opening of the tobacco loading chamber, and the wet ball temperature of the dense baking house is precisely controlled through the wet control of the dense baking house gas-water separation channel and the hot air circulation channel. However, in order to achieve gas-water separation and wet exhaust, the invention increases the equipment of the dense baking house, thereby increasing the operation and use cost. SUMMARY

[0007] The purpose of the present application is to provide a tobacco baking system based on geothermal energy, which has lower operation cost and wider application area, so as to reduce the cost of tobacco baking, improve the baking efficiency and improve the quality of tobacco.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] A tobacco baking system based on geothermal energy, comprising:

[0010] A geothermal water circulation system;

[0011] An organic Rankine cycle system, which comprises a first evaporator, a turbine, a first condenser and an organic medium circulating pump, the first evaporator, the turbine, the first condenser and the organic medium circulating pump are connected in series to form an organic Rankine cycle loop, and the first evaporator is connected in series with the geothermal water circulation system to exchange heat between the organic medium in the organic Rankine cycle loop and the geothermal water in the geothermal water circulation system;

[0012] A heat pump system, which comprises a second evaporator, a throttling component, a second condenser and a compressor, the second evaporator, the throttling component, the second condenser and the compressor are connected in series to form a heat pump circulation loop, and the turbine is drivingly connected with the compressor;

[0013] The baking system comprises a circulating fan, a cooler, and a tobacco chamber, the cooler, the second evaporator, and the second condenser are connected in series through a circulating air duct between an air outlet of the tobacco chamber and an air inlet of the tobacco chamber to form a circulating air loop, and the circulating fan is used to drive the circulating air to flow in the circulating air loop.

[0014] The auxiliary system comprises a cooling device, the cooling device and the cooler and the first condenser are connected in series to form a cooling loop, or the cooler and the first condenser are connected in parallel at both ends of the cooling device to form a cooling loop.

[0015] In a preferred embodiment of the present application, the organic Rankine cycle system further comprises a first regenerator, a high-temperature section of a first regenerative channel of the first regenerator is connected in series between the turbine and the first condenser, and a low-temperature section of the first regenerative channel of the first regenerator is connected in series between the organic medium circulating pump and the first evaporator.

[0016] In a preferred embodiment of the present application, the baking system comprises a second regenerator, a high-temperature section of a second regenerative channel of the second regenerator is connected in series between the air outlet of the tobacco chamber and the cooler, and a low-temperature section of the second regenerative channel of the second regenerator is connected in series between the second evaporator and the second condenser.

[0017] In a preferred embodiment of the present application, the baking system further comprises a heat exchanger for heating the circulating air, the heat exchanger is connected in series in the circulating air loop and located between the second regenerator and the second condenser, the heat exchanger is connected in series in the geothermal water circulation system, and the heat exchanger is connected in parallel or in series with the first evaporator, so that the circulating air passing through the heat exchanger exchanges heat with the geothermal water in the geothermal water circulation system.

[0018] In a preferred embodiment of the present application, the circulating air duct comprises a first circulating air return duct and a second circulating air return duct, an air outlet end of the heat exchanger communicates with the air inlet of the tobacco chamber through the first circulating air return duct, and an air outlet end of the second condenser communicates with the air inlet of the tobacco chamber through the second circulating air return duct, and the first circulating air return duct and the second circulating air return duct are respectively provided with air volume adjusting valves.

[0019] In a preferred embodiment of the present application, the second circulating air return duct communicates with an air inlet end of the second regenerator through an adjusting air duct, and a normally closed valve is arranged on the adjusting air duct.

[0020] In a preferred embodiment of the present application, the circulating fan is arranged between the second regenerator and the heat exchanger.

[0021] In a preferred embodiment of the present application, the compressor is a turbine and motor driven compressor, and the compressor is respectively in driving connection with the turbine and the motor.

[0022] In a preferred embodiment of the present application, the baking system further comprises a heater, which is arranged in the tobacco loading chamber and located at the air inlet of the tobacco loading chamber, and the heater is used for adjusting the temperature of the circulating air sent into the air inlet of the tobacco loading chamber by the circulating air pipeline.

[0023] In a preferred embodiment of the present application, the geothermal water circulation system comprises a geothermal well and a second circulating water pump, the water outlet of the second circulating water pump is in communication with the water inlet of the first evaporator through a geothermal water delivery pipeline, the water outlet of the first evaporator is in communication with the geothermal well through a geothermal water return pipeline, and the second circulating water pump is used for pumping geothermal water from the geothermal well.

[0024] As can be seen from the above technical solutions, the present application discloses a tobacco baking system based on geothermal energy, which comprises a geothermal water circulation system, an organic Rankine cycle system, a heat pump system, a baking system and an auxiliary system, wherein the organic Rankine cycle system comprises a first evaporator, a turbine, a first condenser and an organic medium circulating pump, the first evaporator, the turbine, the first condenser and the organic medium circulating pump are connected in series to form an organic Rankine cycle loop, the first evaporator is connected in series to the geothermal water circulation system to exchange heat between the organic medium in the organic Rankine cycle loop and the geothermal water in the geothermal water circulation system; the heat pump system comprises a second evaporator, a throttling component, a second condenser and a compressor, the second evaporator, the throttling component, the second condenser and the compressor are connected in series to form a heat pump circulation loop, and the turbine is in driving connection with the compressor; the baking system comprises a circulating fan, a cooler and a tobacco loading chamber, the second evaporator and the second condenser are connected in series through a circulating air pipeline between the air outlet of the tobacco loading chamber and the air inlet of the tobacco loading chamber to form a circulating air loop, and the circulating fan is used to drive the circulating air to flow in the circulating air loop; and the auxiliary system comprises a cooling device, the cooling device is connected in series with the cooler and the first condenser to form a cooling loop, or the cooler and the first condenser are connected in parallel at two ends of the cooling device to form the cooling loop.

[0025] During system operation, the geothermal water circulation system sends high-temperature geothermal water into the first evaporator, the organic medium in the organic Rankine cycle system is vaporized after absorbing heat of the geothermal water in the first evaporator and then enters the turbine, the turbine drives the compressor of the heat pump system to work under the action of the vaporized organic medium, the organic medium after work enters the first condenser to return to liquid state, and then returns to the first evaporator through the organic medium circulating pump to complete the circulation of the organic Rankine cycle system. The geothermal water after heat exchange with the first evaporator in the geothermal water circulation system is recharged into the geothermal well.

[0026] After the organic Rankine cycle system is operated, the heat pump system is operated under the driving of the compressor, the refrigerant in the heat pump system is compressed by the compressor to become a high-temperature and high-pressure gas, then enters the second condenser to cool and release heat, becomes a medium-temperature and high-pressure liquid refrigerant, then the medium-temperature and high-pressure liquid refrigerant enters the throttling part to be throttled and decompressed into a low-temperature and low-pressure gas-liquid mixture, and then enters the second evaporator to be vaporized by absorbing heat in the surrounding air.

[0027] The circulating fan of the baking system extracts the humid air generated in the baking process from the smoking chamber and makes it flow along the circulating air circuit, in the process, the humid air passes through the cooler, the second evaporator and the second condenser in turn, in the cooler and the second evaporator, part of the water in the humid air is discharged by cooling and the air temperature is reduced, then the air enters the second condenser to be heated and returns to the smoking chamber.

[0028] It can be seen that the tobacco leaf baking system based on geothermal energy uses geothermal energy for tobacco leaf baking, realizes temperature and humidity control of circulating air, creates air distribution conditions, reduces system complexity, realizes full utilization of geothermal energy, is green, low-carbon and renewable, has low operation cost and wide application area, is especially suitable for tobacco leaf baking areas with weak power supply facilities, high altitude and high humidity, and has important significance for reducing tobacco leaf baking cost, improving baking efficiency and improving tobacco leaf quality. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0030] Figure 1 The structure schematic diagram of the tobacco leaf baking system based on geothermal energy provided by the embodiments of the present application.

[0031] Among them:

[0032] 1 is the first evaporator; 2 is the turbine; 3 is the driving motor; 4 is the first regenerator; 5 is the first condenser; 6 is the organic medium circulating pump; 7 is the second condenser; 8 is the throttling part; 9 is the second evaporator; 10 is the compressor; 11 is the second regenerator; 12 is the circulating fan; 13 is the heat exchanger; 14 is the cooler; 15 is the air cooling tower; 16, 17 and 18 are the heaters; 19, 20, 21, 22, 23 and 24 are the air volume regulating valves; 25 is the normally closed valve; 26 is the second circulating water pump; 27 is the first circulating water pump. DETAILED DESCRIPTION

[0033] The core of the present application is to provide a tobacco leaf curing system based on geothermal energy, which has a lower operating cost and a wider application area, so as to reduce the cost of tobacco leaf curing, improve the curing efficiency and improve the quality of tobacco leaves.

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] Please refer to Figure 1 , Figure 1 The structure diagram of the tobacco leaf curing system based on geothermal energy provided by the embodiments of the present application is shown.

[0036] The tobacco leaf curing system based on geothermal energy disclosed in the embodiments of the present application includes a geothermal water circulation system, an organic Rankine cycle system, a heat pump system, a curing system and an auxiliary system.

[0037] The geothermal water circulation system is used to provide geothermal water for the whole tobacco leaf curing system, the organic Rankine cycle system absorbs the heat in the geothermal water to drive the compressor 10 in the heat pump system to operate, and of course the geothermal water circulation system can also provide geothermal water for temperature adjustment of circulating air.

[0038] As can be easily understood by those skilled in the art, the organic Rankine cycle (Organic Rankine Cycle, ORC for short) is a Rankine cycle with low-boiling-point organic matter as the working medium. In the present case, the organic Rankine cycle system includes a first evaporator 1, a turbine 2, a first condenser 5 and an organic medium circulating pump 6. The turbine 2 is a transliteration of the English word turbine. The compressor 10, steam turbine, turbine, flue gas turbine and expander can all be called turbine 2. In the present case, the turbine 2 is a steam turbine. The first evaporator 1, the turbine 2, the first condenser 5 and the organic medium circulating pump 6 are connected in series to form an organic Rankine cycle loop. Low-boiling-point organic medium circulates in the organic Rankine cycle loop. The first evaporator 1 is connected in series with the geothermal water circulation system, so that the organic medium in the organic Rankine cycle loop exchanges heat with the geothermal water in the geothermal water circulation system.

[0039] The heat pump system comprises a second evaporator 9, a throttling component 8, a second condenser 7 and a compressor 10, which are connected in series to form a heat pump circulation loop, and the turbine 2 is drivingly connected with the compressor 10. In operation, the compressor 10 compresses the refrigerant into a high-temperature and high-pressure gas state, and then the refrigerant is sent to the second condenser 7 to be cooled and release heat, and the cooled and heat-released refrigerant becomes a medium-temperature and high-pressure liquid state. The medium-temperature and high-pressure liquid state refrigerant is throttled and decompressed by the throttling component 8 to become a low-temperature and low-pressure gas-liquid mixture, and then the low-temperature and low-pressure gas-liquid mixture is evaporated and absorbs heat in the air in the second evaporator 9 to become a gaseous state, and then the gaseous state refrigerant returns to the compressor 10 to continue to be compressed and circulate to perform refrigeration.

[0040] The baking system comprises a circulating fan 12, a cooler 14 and a smoking chamber. The cooler 14, the second evaporator 9 and the second condenser 7 are connected in series through a circulating air duct between an air outlet of the smoking chamber and an air inlet of the smoking chamber to form a circulating air loop. The circulating fan 12 is used to drive the circulating air to flow in the circulating air loop. The smoking chamber can be provided with a plurality of chambers, and each chamber is connected in parallel.

[0041] The auxiliary system comprises a cooling device, and the cooling device is connected in series with the cooler 14 and the first condenser 5 to form a cooling loop, or the cooler 14 and the first condenser 5 are connected in parallel at both ends of the cooling device to form a cooling loop, so as to cool the organic medium in the first condenser 5 and the circulating air flowing through the cooler 14.

[0042] In operation, the geothermal water circulation system sends high-temperature geothermal water into the first evaporator 1, and the organic medium in the organic Rankine cycle system is vaporized after absorbing heat of the geothermal water in the first evaporator 1, and then enters the turbine 2. The turbine 2 drives the compressor 10 of the heat pump system to operate under the action of the vaporized organic medium, and the organic medium after work enters the first condenser 5 to return to a liquid state, and then returns to the first evaporator 1 through the organic medium circulation pump 6 to complete the circulation of the organic Rankine cycle system. The geothermal water after heat exchange with the first evaporator 1 in the geothermal water circulation system is recharged into the geothermal well.

[0043] After the organic Rankine cycle system operates, the heat pump system operates under the driving of the compressor 10. The refrigerant in the heat pump system is compressed by the compressor 10 into a high-temperature and high-pressure gas state, and then enters the second condenser 7 to be cooled and release heat, and becomes a medium-temperature and high-pressure liquid state. Then the medium-temperature and high-pressure liquid state refrigerant enters the throttling component 8 to be throttled and decompressed into a low-temperature and low-pressure gas-liquid mixture, and then enters the second evaporator 9 to absorb heat in the surrounding air to be vaporized.

[0044] The circulating fan 12 of the curing system draws the humid air generated in the curing process from the tobacco chamber and makes it flow along the circulating air circuit, in the process, the humid air passes through the cooler 14, the second evaporator 9 and the second condenser 7 in turn, in the cooler 14 and the second evaporator 9, part of the water in the humid air is discharged by cooling and the air temperature is reduced, and then the air enters the second condenser 7 to be heated and returns to the tobacco chamber.

[0045] It can be seen that, compared with the prior art, the tobacco leaf curing system based on geothermal energy provided by the embodiment of the application utilizes geothermal energy for tobacco leaf curing, realizes temperature and humidity control of circulating air, reduces the complexity of the system while creating air distribution conditions, realizes full utilization of geothermal energy, is green, low-carbon and renewable, has lower operation cost and a wider application area, is particularly suitable for tobacco leaf curing areas with weak power supply facilities, high altitude and high humidity, and has important significance for reducing tobacco leaf curing cost, improving curing efficiency and improving tobacco leaf quality.

[0046] The organic Rankine cycle system further comprises a first regenerator 4, a high-temperature section of a first regenerative channel of the first regenerator 4 is connected in series between the turbine 2 and the first condenser 5, and a low-temperature section of the first regenerative channel of the first regenerator 4 is connected in series between the organic medium circulating pump 6 and the first evaporator 1. The first regenerative channel of the first regenerator 4 is composed of the high-temperature section and the low-temperature section, and the high-temperature section and the low-temperature section are in thermal conduction cooperation, that is, heat exchange can occur between the high-temperature section of the first regenerative channel of the first regenerator 4 and the low-temperature section of the first regenerative channel of the first regenerator 4. In the system operation process, after the organic medium is gasified by absorbing the heat of the geothermal water in the first evaporator 1, it flows out from the organic medium outlet of the first evaporator 1 and enters the turbine 2, the turbine 2 drives the compressor 10 of the heat pump system to operate and work under the action of the gasified organic medium, the organic medium after work enters the first condenser 5 through the high-temperature section of the first regenerative channel of the first regenerator 4 to return to the liquid state, and then enters the low-temperature section of the first regenerative channel of the first regenerator 4 through the organic medium circulating pump 6, the organic medium in the high-temperature section of the first regenerative channel of the first regenerator 4 heats the organic medium in the low-temperature section of the first regenerative channel of the first regenerator 4, and finally the organic medium returns to the first evaporator 1.

[0047] The baking system comprises a second heat regenerator 11, a high-temperature section of a second heat regenerative channel of the second heat regenerator 11 is connected in series between an air outlet of the tobacco chamber and the cooler 14, and a low-temperature section of the second heat regenerative channel of the second heat regenerator 11 is connected in series between the second evaporator 9 and the second condenser 7; during operation of the system, the wet air sequentially passes through the high-temperature section of the second heat regenerative channel of the second heat regenerator 11, the cooler 14, the second evaporator 9, the low-temperature section of the second heat regenerative channel of the second heat regenerator 11, and the second condenser 7; the water is removed and the air temperature is reduced in the second heat regenerator 11, the cooler 14 and the second evaporator 9 by means of condensation by temperature reduction; then the air enters the low-temperature section of the second heat regenerative channel of the second heat regenerator 11 to exchange heat with the wet air in the high-temperature section of the second heat regenerative channel of the second heat regenerator 11 to increase the temperature; and finally, the air passes through the second condenser 7 to return to the tobacco chamber.

[0048] The first heat regenerator 4 and the second heat regenerator 11 can fully recover and utilize the heat in the system, reduce heat waste, and improve energy utilization.

[0049] In order to fully utilize the heat of the geothermal water, in the embodiment of the present application, as shown in Figure 1 the baking system further comprises a heat exchanger 13 for heating the circulating air, the heat exchanger 13 is connected in series in the circulating air circuit and is located between the second heat regenerator 11 and the second condenser 7, the heat exchanger 13 is connected in series in the geothermal water circulation system and the heat exchanger 13 is connected in parallel or in series with the first evaporator 1, the circulating air passing through the heat exchanger 13 exchanges heat with the geothermal water in the geothermal water circulation system, the geothermal water circulation system sends the geothermal water into the heat exchanger 13, and the circulating air exchanges heat with the geothermal water in the heat exchanger 13 when passing through the heat exchanger 13 to increase the temperature of the circulating air, so that the heat exchanger 13 and the second condenser 7 can constitute two-stage heating of the circulating air, effective temperature control of the circulating air can be achieved, and the heat of the geothermal water can be fully utilized.

[0050] Further optimization of the above technical solution, as shown in Figure 1 the circulating air pipeline comprises a first circulating air return pipeline and a second circulating air return pipeline, an air outlet end of the heat exchanger 13 is communicated with an air inlet of the tobacco chamber through the first circulating air return pipeline, and an air outlet end of the second condenser 7 is communicated with the air inlet of the tobacco chamber through the second circulating air return pipeline, the first circulating air return pipeline and the second circulating air return pipeline are respectively provided with air volume adjusting valves, by providing the first circulating air return pipeline and the second circulating air return pipeline, the circulating air can pass through one or both of the heat exchanger 13 and the second condenser 7 by adjusting the air volume adjusting valves during operation, the air volume of the air outlet of the first circulating air return pipeline and the second circulating air return pipeline can be adjusted by the air volume adjusting valves, at least two kinds of return air temperature can be realized, effective temperature control of the return air of the tobacco chamber can be realized, and high-quality baking of the tobacco leaves can be realized.

[0051] As Figure 1 shown in the embodiment of the present application, the second circulating air return duct is communicated with the air inlet end of the second regenerator 11 through an adjusting air duct, and a normally closed valve 25 is arranged on the adjusting air duct. When the normally closed valve 25 is opened, the circulating air duct can be quickly started and preheated and debugged. In order to avoid the adverse effects of wet air on the circulating fan 12, in the embodiment of the present application, the circulating fan 12 is arranged between the second regenerator 11 and the heat exchanger 13. In this way, the circulating air first enters the second regenerator 11, the cooler 14 and the second evaporator 9 to be dehumidified, and then enters the circulating fan 12.

[0052] In a preferred embodiment of the present application, the compressor 10 is a turbo-electric dual-drive compressor 10, which is drivingly connected with the turbine 2 and the driving motor 3. That is, the compressor 10 can be driven by the turbine 2 or the driving motor 3. The power consumption of the driving motor 3 comes from the power grid. In this way, according to the working condition requirements, the turbine 2 or the driving motor 3 can be selected to drive the compressor 10, so that the tobacco leaf curing system based on geothermal energy can be applied to various working conditions and is more flexible. The specific working modes of the tobacco leaf curing system under different working conditions will be described in detail later.

[0053] Further optimization of the above technical solution, in the embodiment of the present application, the driving motor 3 is a motor-generator integrated machine. In this way, when the compressor 10 is driven by the turbine 2, the driving motor 3 can act as a generator to generate electric energy which can be used for other electric equipment of the tobacco leaf curing system based on geothermal energy. When the power generation load is greater than the power consumption load of the electric equipment of the tobacco leaf curing system, the remaining electric energy can be transmitted to the power grid for external transmission. The compressor 10 can also be driven by the turbine 2 and the driving motor 3 at the same time. At this time, the electric energy of the driving motor 3 and the electric equipment of the tobacco leaf curing system comes from the power grid. Of course, the compressor 10 can also be driven by the driving motor 3 alone. It should be noted that a one-way clutch should be installed between the compressor 10 and the turbine 2. That is, only the turbine 2 can drive the compressor 10 to operate, and the compressor 10 cannot drive the turbine 2.

[0054] It can be predicted that due to the influence of pipe length and environment, the circulating air temperature delivered to the tobacco loading chamber will have a small fluctuation. Therefore, in the embodiment of the present application, a heater is arranged at the air inlet of the tobacco loading chamber. When the circulating air temperature delivered to the tobacco loading chamber is unstable, the heater can be used to accurately adjust the circulating air temperature, thereby realizing high-quality curing of tobacco leaves. Further, in the embodiment of the present application, the heater is an electric heater. The electric energy generated by the driving motor 3 when acting as a generator can be used for the electric heater, so as to reduce energy consumption.

[0055] As Figure 1As shown, in the embodiment of the present application, the cooling device comprises an air cooling tower 15 and a first circulating water pump 27, the first circulating water pump 27 sends the cooling water cooled by the air cooling tower 15 to the cooler 14 and the first condenser 5, the cooling water is heated by exchanging heat with the wet air in the cooler 14 and is heated by exchanging heat with the organic medium of the organic Rankine cycle system in the first condenser 5, and then returns to the air cooling tower 15.

[0056] Further optimization of the above technical solutions, such as Figure 1 As shown, the condensate outlet of the second evaporator 9 is connected to the cooling circuit through a condensate pipeline, and a trap valve is arranged on the condensate pipeline, so that the condensate of the second evaporator 9 can be released into the cooling circuit as make-up water.

[0057] The above-mentioned geothermal water circulation system comprises a geothermal well and a second circulating water pump 26, the water outlet of the second circulating water pump 26 is communicated with the water inlet of the first evaporator 1 through a geothermal water supply pipeline, and the water outlet of the first evaporator 1 is communicated with the geothermal well through a geothermal water return pipeline, the second circulating water pump 26 is used to extract geothermal water from the geothermal well, and then send it to the first evaporator 1, and the geothermal water after passing through the first evaporator 1 is recharged into the geothermal well.

[0058] As Figure 1 As shown in one embodiment of the present application, three smoke loading chambers are arranged, which are a first smoke loading chamber, a second smoke loading chamber and a third smoke loading chamber, the first end of the first circulating air return pipeline is communicated with the air outlet end of the heat exchanger 13, the second end of the first circulating air return pipeline is provided with three first circulating air return branch pipelines, the three first circulating air return branch pipelines are connected with the first smoke loading chamber, the second smoke loading chamber and the third smoke loading chamber respectively, correspondingly, the first end of the second circulating air return pipeline is communicated with the air outlet end of the second condenser 7, the second end of the second circulating air return pipeline is provided with three second circulating air return branch pipelines, the three second circulating air return branch pipelines are connected with the first smoke loading chamber, the second smoke loading chamber and the third smoke loading chamber respectively, and air volume regulating valves (19-24) are arranged on the three first circulating air return branch pipelines and the three second circulating air return branch pipelines respectively, a heater 16 is arranged in the first smoke loading chamber, a heater 17 is arranged in the second smoke loading chamber, and a heater 18 is arranged in the third smoke loading chamber.

[0059] The first smoke loading chamber, the second smoke loading chamber and the third smoke loading chamber are respectively provided with electric heaters.

[0060] The working process of the tobacco leaf curing system based on geothermal energy will be further described below in combination with specific working conditions.

[0061] When the system is running, high-temperature geothermal water enters the first evaporator 1 and the heat exchanger 13, respectively. The organic medium in the organic Rankine cycle system absorbs heat in the first evaporator 1 and then enters the turbine 2. The turbine 2 drives the turbo-electric dual-drive compressor 10 to rotate at high speed. The organic medium after work enters the first condenser 5 through the first regenerator 4. The organic medium is cooled to liquid state in the first condenser 5, and then enters the first regenerator 4 through the organic medium circulating pump 6. The heated organic medium returns to the first evaporator 1 to complete the cycle of the organic Rankine cycle system.

[0062] In the heat exchanger 13, the geothermal water exchanges heat with the circulating air, and the circulating air is heated to a set temperature t1℃. The geothermal water after exchanging heat with the heat exchanger 13 and the first evaporator 1 is recharged to the underground.

[0063] After the organic Rankine cycle system is running, the heat pump system is driven by the turbo-electric dual-drive compressor 10 to operate. The refrigerant in the heat pump system enters the second condenser 7 after passing through the turbo-electric dual-drive compressor 10. The circulating air after being heated by the heat exchanger 13 exchanges heat with the second condenser 7. The temperature of the circulating air is raised to t2℃. Then the refrigerant is throttled by the throttling part 8 and enters the second evaporator 9. The heat pump cycle is realized after passing through the turbo-electric dual-drive compressor 10.

[0064] The circulating air with temperatures of t1℃ and t2℃ is connected to the smoking chamber through the air distribution pipe, and the air volume is adjusted through the respective pipe valves to realize the air distribution of t1℃-t2℃, so as to meet the needs of the circulating air temperature at different baking stages in multiple smoking chambers. Further, in order to accurately control the baking temperature, an electric heater is installed at the circulating air inlet of the smoking chamber, and the real-time accurate control of the baking temperature is completed through servo control. The high-temperature and low-humidity circulating air enters the smoking chamber to bake tobacco leaves. The low-temperature and high-humidity circulating air after baking exits the smoking chamber and enters the high-temperature section of the second regenerator 11. After passing through the second regenerator 11, the circulating air enters the cooler 14 to be cooled and dehumidified. By controlling the heat exchange amount of the cooler 14, the circulating air humidity control can be realized to meet the needs of the smoking chamber baking. Then the circulating air with part of the condensed water enters the condenser 9, and the circulating air is further cooled and dehumidified. The condensed water is discharged through the drain valve. The low-temperature and low-humidity circulating air after exiting the second evaporator 9 enters the low-temperature section of the second regenerator 11 to absorb heat and increase temperature. Then the circulating air is driven by the circulating air fan 12 and exchanges heat with the heat exchanger 13 and the second condenser 7 to complete the circulating air cycle. In order to realize the above functions, the system is configured with an air cooling tower 15 to meet the heat exchange needs of the first condenser 5, the cooler 14 and the second evaporator 9.

[0065] At the same time, in order to optimally utilize geothermal resources, the driving motor 3 is coupled with the turbo-electric dual-drive compressor 10. The system expands the "baking +" capacity and realizes the low-carbon and green sustainable operation of the system.

[0066] The first tobacco chamber is set to the roasting yellowing stage (roasting temperature 40℃), the second tobacco chamber is set to the color fixing stage (roasting temperature 50℃), and the third tobacco chamber is set to the dry muscle stage (roasting temperature 65℃). When the system is running, according to the circulating air volume and the outlet temperature of the heat exchanger 13, the flow of geothermal water is adjusted so that the outlet circulating air temperature of the heat exchanger 13 is 40℃, at this time the air volume adjusting valve 20 on the second circulating return air branch pipe connected with the first tobacco chamber is opened, the air volume adjusting valve 19 on the first circulating return air branch pipe connected with the first tobacco chamber is closed, and part of the 40℃ circulating air is sent to the first tobacco chamber to roast the yellowing stage tobacco leaves; while the other part of the 40℃ circulating air is heat exchanged with the second condenser 7, and the circulating air is heated to 65℃ by adjusting the power of the steam-electric dual-drive compressor 10, at this time the air volume adjusting valve 24 on the second circulating return air branch pipe connected with the third tobacco chamber is opened, the air volume adjusting valve 23 on the first circulating return air branch pipe connected with the third tobacco chamber is closed, and the 65℃ circulating air is sent to the third tobacco chamber to roast the dry muscle stage tobacco leaves; and for the roasting temperature in the second tobacco chamber, the air volume adjusting valve 21 on the first circulating return air branch pipe connected with the second tobacco chamber and the air volume adjusting valve 22 on the second circulating return air branch pipe connected with the second tobacco chamber are adjusted to realize air distribution of 50℃, and then realize the setting of the temperature in the range of 40℃-65℃.

[0067] Due to the influence of pipe length and environment, the circulating air temperature delivered to the tobacco chamber will have a small fluctuation, at this time the circulating air temperature can be accurately adjusted by the electric heater in each tobacco chamber, and then high-quality tobacco roasting is realized.

[0068] When the system is running normally, the output power of the turbine 2 is controlled by adjusting the flow of geothermal water entering the first evaporator 1, and then matched with the circulating air heating power, according to the operating conditions, the following optional working conditions are available.

[0069] When the output power of the turbine 2 matches the circulating air heating power:

[0070] Working condition 1: At this time, the output power of the turbine 2, the running power of the steam-electric dual-drive compressor 10 and the circulating air heating power (t1℃-t2℃ temperature rise power) are matched, and the flow of geothermal water to the heat exchanger 13 and the first evaporator 1 remains unchanged.

[0071] When the output power of the turbine 2 does not match the circulating air heating power:

[0072] Working condition 2: when the turbine 2 output power is larger, and the circulating air heating power (t1℃ to t2℃ temperature rise power) is smaller, the steam-electric dual drive compressor 10 does not need larger output load, at this time the driving motor 3 is coupled with the steam-electric dual drive compressor 10, the turbine 2 drives the steam-electric dual drive compressor 10 at the same time, and the driving motor 3 generates electricity, the generated electricity can be used for electric heater, valve switch and the like, when the power generation load is greater than the auxiliary power load, the remaining electricity is transmitted to the power grid for transmission.

[0073] Working condition 3: when the turbine 2 output power is smaller, and the circulating air heating power (t1℃ to t2℃ temperature rise power) is larger, the steam-electric dual drive compressor 10 needs larger output load, at this time the driving motor 3 is coupled with the steam-electric dual drive compressor 10, the turbine 2 and the driving motor 3 jointly drive the steam-electric dual drive compressor 10 to work, at this time the auxiliary power and the driving motor 3 electricity come from the power grid.

[0074] Working condition 4: when the turbine 2 fails to drive the steam-electric dual drive compressor 10, at this time the driving motor 3 is coupled with the steam-electric dual drive compressor 10, the turbine 2 stops running, and the driving motor 3 drives the steam-electric dual drive compressor 10 to work alone, at this time the auxiliary power and the driving motor 3 electricity come from the power grid.

[0075] Working condition 5: when the smoke loading chamber only needs specific parameter circulating air parameters, only the heat exchanger 13 can realize the temperature rise control of the circulating air, at this time the baking system can be operated by cooperating with the cooler 14, the heat pump system does not work, and the organic Rankine cycle system can continue to work, the driving motor 3 is driven by the turbine 2, and the generated electricity can be used for power generation or sent to the power grid for transmission.

[0076] In summary, the tobacco baking system based on geothermal energy provided by the embodiment of the application exchanges heat by using widely distributed geothermal energy and an organic Rankine cycle system, the organic medium in the organic Rankine cycle system is heated in the first evaporator 1, then expands in the turbine 2 to drive the compressor 10 of the heat pump system to work, and then the organic medium returns to the first evaporator 1 through the first condenser 5, the first regenerator 4 and the organic medium circulating pump 6, to complete the work cycle of the organic Rankine cycle system; the heat pump system with the organic Rankine cycle system as the compression power heats the circulating air through the second condenser 7, dehumidifies and cools the circulating air through the cooler 14 and the second evaporator 9, to realize the circulation of the circulating air; further, to improve the economic efficiency of the system, the heat exchanger 13 is arranged, the geothermal water exchanges heat with the circulating air through the heat exchanger 13, to further improve the temperature of the circulating air, and the system complexity is reduced while the air distribution conditions are created. Through the air distribution pipeline and the valve, any air temperature in the high-temperature and low-temperature interval can be realized, and the temperature can be accurately controlled through the electric heater. During operation, the compressor 10 is connected with the turbine 2 and the driving motor 3 at both ends, and four coupling operation modes of “driving motor 3+compressor 10+ turbine 2”, “driving motor 3+compressor 10”, “compressor 10+turbine 2” and “driving motor 3+turbine 2” can be realized, according to the system load characteristics, the “baking +” capacity can be expanded, and the optimal configuration scheme of energy utilization is realized.

[0077] The system is based on geothermal energy, green, low-carbon and renewable, has relatively low operation cost and relatively wide application area, and is particularly suitable for tobacco baking areas with weak power supply facilities, high altitude and high humidity. The system further realizes full use of geothermal energy by expanding the “baking +” capacity, and has important significance for reducing the tobacco baking cost, improving the baking efficiency and improving the quality of tobacco.

[0078] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0079] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A geothermal energy based tobacco curing system, characterized in that, The system comprises: a geothermal water circulation system; an organic Rankine cycle system, which comprises a first evaporator, a turbine, a first condenser and an organic medium circulation pump, the first evaporator, the turbine, the first condenser and the organic medium circulation pump are connected in series to form an organic Rankine cycle loop, the first evaporator is connected in series to the geothermal water circulation system, so that the organic medium in the organic Rankine cycle loop exchanges heat with the geothermal water in the geothermal water circulation system; a heat pump system, which comprises a second evaporator, a throttling component, a second condenser and a compressor, the second evaporator, the throttling component, the second condenser and the compressor are connected in series to form a heat pump circulation loop, the turbine is drivingly connected to the compressor; a baking system, which comprises a circulating fan, a cooler and a smoking chamber, the cooler, the second evaporator and the second condenser are connected in series through a circulating air duct between an air outlet of the smoking chamber and an air inlet of the smoking chamber to form a circulating air loop, and the circulating fan is used to drive the circulating air to flow in the circulating air loop; an auxiliary system, which comprises a cooling device, the cooling device is connected in series with the cooler and the first condenser to form a cooling loop, or the cooler and the first condenser are connected in parallel to both ends of the cooling device to form a cooling loop, so as to cool the organic medium in the first condenser and the circulating air flowing through the cooler; the organic Rankine cycle system further comprises a first regenerator, a high-temperature section of a first regenerative channel of the first regenerator is connected in series between the turbine and the first condenser, and a low-temperature section of the first regenerative channel of the first regenerator is connected in series between the organic medium circulation pump and the first evaporator.

2. The geothermal energy based tobacco leaf curing system as claimed in claim 1 wherein, the baking system comprises a second regenerator, a high-temperature section of a second regenerative channel of the second regenerator is connected in series between the air outlet of the smoking chamber and the cooler, and a low-temperature section of the second regenerative channel of the second regenerator is connected in series between the second evaporator and the second condenser.

3. The geothermal energy based tobacco leaf curing system as claimed in claim 2, wherein, the baking system further comprises a heat exchanger for heating the circulating air, the heat exchanger is connected in series in the circulating air loop and located between the second regenerator and the second condenser, the heat exchanger is connected in series to the geothermal water circulation system, and the heat exchanger is connected in parallel or in series to the first evaporator, so that the circulating air passing through the heat exchanger exchanges heat with the geothermal water in the geothermal water circulation system.

4. The geothermal energy based tobacco leaf curing system as claimed in claim 3, wherein, the circulating air duct comprises a first circulating air return duct and a second circulating air return duct, an air outlet end of the heat exchanger is communicated with the air inlet of the smoking chamber through the first circulating air return duct, and an air outlet end of the second condenser is communicated with the air inlet of the smoking chamber through the second circulating air return duct, the first circulating air return duct and the second circulating air return duct are respectively provided with air volume adjusting valves.

5. The geothermal energy based tobacco leaf curing system as claimed in claim 4, wherein, the second circulating air return duct is communicated with an air inlet end of the second regenerator through an adjusting air duct, and a normally closed valve is arranged on the adjusting air duct.

6. A geothermal energy based tobacco curing system according to any one of claims 3 to 5, wherein, the circulating fan is arranged between the second regenerator and the heat exchanger.

7. The geothermal energy based tobacco leaf curing system according to claim 1, wherein, The compressor is a turbine and motor driven compressor, and is respectively in transmission connection with the turbine and the driving motor.

8. The geothermal energy based tobacco leaf curing system according to any one of claims 1-5 and 7, wherein, The roasting system further comprises a heater arranged in the tobacco loading chamber and located at an air inlet of the tobacco loading chamber, and the heater is used for adjusting the temperature of the circulating air sent into the air inlet of the tobacco loading chamber by the circulating air pipeline.

9. The geothermal energy based tobacco leaf curing system according to any one of claims 1-5 and 7, wherein, The geothermal water circulation system comprises a geothermal well and a second circulating water pump, a water outlet of the second circulating water pump is communicated with a water inlet of the first evaporator through a geothermal water delivery pipeline, a water outlet of the first evaporator is communicated with the geothermal well through a geothermal water return pipeline, and the second circulating water pump is used for pumping geothermal water from the geothermal well.

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