Steam and heat recovery system for wine brewing distillation process

Abstract

The invention relates to a steam and heat recovery system for a wine brewing distillation process. Main equipment comprises a heat recovery unit taking pentafluoropropane R245fa as a heating medium, a wine cooler for heat recovery and a directly-heated steam generator for the pentafluoropropane R245fa. The auxiliary equipment and auxiliary materials comprise an air energy hot water unit, an air energy hot water pump, a heat storage water tank, a water source water pump, a water softener, an electromagnetic valve, other valves, pipelines, pipe fittings, heat preservation materials and a PLC control system. The system is reasonable in design, waste heat in a traditional wine brewing process is fully recycled, so that the waste heat is recycled, cooling water is not discharged outwards, water resources are greatly saved, good effects of environmental protection, energy conservation, emission reduction and carbon emission reduction can be achieved, and considerable economic benefits and social benefits are brought.

Description

Technical Field

[0001] The invention relates to a wine distillation process and waste heat recovery and utilization in the wine industry to produce a system for saturated steam at 100-120°C. Background Art

[0002] Energy-saving and emission-reduction transformation and technological innovation for the traditional distillation process in the brewing industry.

[0003] The traditional distillation method of my country's wine industry is: coal-fired boilers, gas-fired boilers, biomass-burning boilers or electric boilers generate steam, and the steam is connected to the bottom of the wine retort through a pipe and then enters the wine retort to heat the mash in the retort and evaporate the wine vapor, which is then led to a traditional wine cooler for condensation, and finally the condensed wine is stored. For different types of wine, such as sauce-flavored, strong-flavored, and light-flavored, although the process is somewhat different, there is basically no waste heat recovery for cooling water, but some wine companies will use some hot water to soak grain, wash the retort or for workers to bathe. During the production season of wine companies, a large amount of cooling water of more than 60-70 degrees will be generated every day, which contains a lot of waste heat. Medium and large wine companies will use cooling towers to cool the cooling water and recycle it. Some small companies may directly discharge it, which not only wastes energy, but also causes environmental pollution, which is not conducive to achieving the goals of energy conservation and emission reduction, carbon peak, and carbon emission reduction. Summary of the invention

[0004] The present invention provides a steam and heat recovery system for a wine-making distillation process, and aims at the traditional wine-making distillation process of the wine industry to carry out energy-saving and emission-reduction transformation, fully utilize the waste heat in the wine-making process to recover the waste heat, and then produce saturated steam of 100°C-120°C for use in the distillation system, so that the waste heat can be recycled, achieving good energy-saving and emission-reduction effects.

[0005] The present invention provides a steam and heat recovery system for a wine distillation process, which achieves waste heat recovery and utilization while reducing the investment in equipment and devices such as cooling towers, eliminating the pollution and volatilization loss of cooling water by the cooling tower, greatly reducing the scaling of wine coolers, improving the cooling effect of the wine coolers, saving water resources, and reducing environmental pollution.

[0006] The present invention provides a steam and heat recovery system for a wine distillation process, which uses green electricity as energy to replace steam boilers that burn coal, gas and biomass, and has no emissions of carbon dioxide and other harmful substances and no pollution to the atmospheric environment.

[0007] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0008] The present invention adopts a heat recovery unit designed for the wine industry with pentafluoropropane R245fa as the heat medium, a wine cooler for heat recovery, and a direct-heated steam generator for pentafluoropropane R245fa as the main equipment, and auxiliary equipment and auxiliary materials include: air-energy hot water unit, air-energy hot water pump, hot water storage tank, water source pump, water softener, solenoid valve and other valves and valve parts, pipelines, pipe fittings and insulation materials, and PLC control system. (The direct-heated steam generator described here refers to the steam generation method of heating water to a certain temperature first and then sending it to a flash tank for flash evaporation. The direct-heated steam generator for pentafluoropropane R245fa adopts the method of passing high-temperature and high-pressure pentafluoropropane R245fa gas into the heat exchange coil of the steam generator, heating the water outside the tube to the saturated evaporation temperature, and directly evaporating it into steam)

[0009] The steam and heat recovery system of the present invention, taking a system that generates 115°C steam and has two wine retorts as an example, comprises two heat recovery units (or modules) 31 and 32 using pentafluoropropane R245fa as heat medium, the heat recovery unit (or module) is provided with an economizer (using a stainless steel plate heat exchanger), a compressor with jet enthalpy increase, and the heat recovery unit (or module) is also provided with recoolers 30 and 29 (using a stainless steel sleeve ring heat exchanger). Its heat source comes from the 60°C hot water (called source water) coming out of the hot water storage tank 24, and the source water is respectively transported to the evaporators in the heat recovery units 31 and 32 through the source water pumps 20 and 21, and after the heat energy is transferred to the low-temperature and low-pressure pentafluoropropane R245fa gas in the heat recovery unit in the evaporator, the temperature of the source water is reduced to 55°C, and the source water is respectively transported to the wine vapor latent heat recovery sections 19 and 10 of the wine cooler through pipelines. At the same time, in the heat recovery unit, the pentafluoropropane R245fa gas heated by the source water is compressed and worked by the compressor in the heat recovery unit, and its temperature rises to about 136°C, turning into a high-temperature and high-pressure gas.

[0010] The above-mentioned pentafluoropropane R245fa gas at about 136°C enters the mosquito coil heat exchanger in the direct-heated steam generator 1 through the copper tubes 33 and 34, exchanges heat with the water in the steam generator 1, condenses into a liquid at about 117°C, and returns to the heat recovery units 31 and 32 again, and enters the recoolers 30 and 29 of the heat recovery units respectively. At the same time, the water in the steam generator 1 is heated to 115°C and evaporates into saturated water vapor at 115°C.

[0011] The saturated water vapor of 115°C generated in the steam generator 1 is transported to the bottom of the wine retorts 5 and 6 through the steam pipe 4, enters the wine retort to heat the mash in the wine retort, and after the mash is heated, it evaporates wine vapor of about 78.3-100°C.

[0012] After the above-mentioned mash is heated, wine vapor of about 78.3-100°C is evaporated, which enters the wine vapor latent heat recovery sections 19 and 10 of the wine cooler through the wine vapor pipes 7 and 8, and the wine vapor is condensed into wine liquid at about 55-56°C in the wine vapor latent heat recovery section, and the heat is exchanged with the source water delivered from the heat recovery units 31 and 32, so that the temperature of the source water is increased. The source water with increased temperature returns to the heat storage tank through the pipeline, completing a source water cycle. At the same time, the latent heat brought by the wine vapor and part of the heat of the wine liquid are recovered in the heat storage tank, completing the latent heat recovery of the wine vapor.

[0013] The above-mentioned wine vapor is condensed into wine liquid at about 55-56°C in the wine vapor latent heat recovery sections 19 and 10, and then flows into the wine liquid waste heat recovery sections 16 and 12. The wine liquid waste heat recovery section and the wine vapor latent heat recovery section are connected together through flanges. In the wine liquid waste heat recovery section, the wine liquid is cooled to below 35°C by the low-temperature water delivered from the water softener 9, completes the distillation process and enters the wine liquid storage tank. At the same time, the low-temperature soft water delivered from the water softener 9 absorbs the heat from the wine liquid, and the temperature rises to about 30°C-50°C.

[0014] The soft water heated to about 30°C-50°C in the above-mentioned wine waste heat recovery section completes the waste heat recovery of the wine and is transported to the subcoolers 30 and 29 of the heat recovery units 31 and 32 through pipelines, respectively, where it exchanges heat with the pentafluoropropane R245fa liquid of about 117°C from the direct-heated steam generator 1, so that the soft water temperature is further increased to high-temperature soft water close to 115°C. The high-temperature soft water is transported to the water replenishment port 2 of the direct-heated steam generator 1 through a pipeline, and enters the steam generator to replenish the water consumed in the steam generator due to the generation of steam. At the same time, the waste heat obtained from the wine waste heat recovery sections 16 and 12 can be fully utilized to reproduce saturated steam of 100°C-120°C.

[0015] The steam and heat recovery system design of a wine distillation process of the present invention also solves the following problems:

[0016] When the heat recovery units 31 and 32 just start to operate and until the steam generator 1 produces 115°C steam and causes the wine retorts 5 and 6 to begin to evaporate wine vapor, there is no waste heat or residual heat that can be recovered in the system. At this time, the water temperature in the water storage tank 24 is relatively low and cannot meet the system's operating requirement of a source water temperature of 50°C-60°C.

[0017] When the heat recovery units 31 and 32 start to operate, even if the source water temperature in the hot water storage tank 24 can meet the operating requirement of 50°C-60°C, if the initial temperature of the water in the steam generator 1 is low, the heat recovery units 31 and 32 cannot operate normally.

[0018] In order to solve the above two problems, the present invention designs an air source hot water unit 25, an air source hot water pump 26 and corresponding valves and pipe connections, and adopts the air source hot water unit 25 as the initial heat source. The purpose of this is to utilize the high energy efficiency ratio characteristics of the air source hot water unit, which can greatly save energy, save more than two-thirds of energy compared to using electric heating pipes or other heat sources, and there is no carbon dioxide emission, so that the system truly achieves all-round energy saving and environmental protection effects.

[0019] The present invention solves the initial heat source problem through the following specific method: before starting the heat recovery units 31 and 32, first close the valves of the water supply port 2 and the sewage outlet 35 at the bottom of the steam generator 1, and cut off the pipeline connection with the air source hot water unit 25 and the air source hot water pump 26; open the valve connecting the hot water storage tank 24 with the air source hot water unit 25 and the air source hot water pump 26 pipeline; set the hot water temperature of the air source hot water unit to 60°C, start the air source hot water unit, and automatically start the air source hot water pump 26 to circulate and heat the water in the hot water storage tank until the water temperature in the hot water storage tank 24 reaches 60°C, then stop the air source hot water unit 25 and the air source hot water pump 26.

[0020] After the above-mentioned air source hot water unit 25 and air source hot water pump 26 are shut down, close the valve connecting the heat storage tank 24 with the air source hot water unit 25 and the air source hot water pump 26; open the valves of the water inlet 2 and the sewage outlet 35 at the bottom of the steam generator 1 to connect them with the pipelines of the air source hot water unit 25 and the air source hot water pump 26; set the hot water temperature of the air source hot water unit to 75°C, and then start the air source hot water unit, which will automatically start the air source hot water pump 26 to circulate and heat the water in the steam generator 1 until the water temperature in the steam generator 1 reaches 75°C, and then stop the air source hot water unit 25 and the air source hot water pump 26.

[0021] After the air source hot water unit 25 and the air source hot water pump 26 are shut down, the valves of the water supply port 2 and the sewage outlet 35 at the bottom of the steam generator 1 are closed again, and the pipe connections with the air source hot water unit 25 and the air source hot water pump 26 are cut off. The valves connecting the hot water storage tank 24 and the air source hot water unit 25 and the air source hot water pump 26 are opened again, the control temperature of the air source hot water unit is set to 60°C, and the air source hot water unit is restarted.

[0022] After that, the air source hot water unit will automatically start when the water temperature in the hot water storage tank 24 is lower than 57°C, to supplement the system in the early stage of operation when there is not enough waste heat to be recovered, and to ensure that the steam generator 1 can produce enough steam for the wine steamer to heat the mash until enough wine vapor is produced. When the heat recovery of the latent heat of wine vapor and the waste heat of the wine reaches a system balance, the air source hot water unit 25 will be in standby mode.

[0023] The above method also solves the problem when waste heat recovery cannot fully meet the heat required by the system. When waste heat recovery cannot fully meet the heat required by the system, the air source hot water unit 25 and the air source hot water pump 26 will automatically start to supplement the heat source.

[0024] The steam and heat recovery system design of a wine distillation process of the present invention also solves the following problems:

[0025] In the wine waste heat recovery sections 16 and 12, the soft water flow rate for cooling the wine is normally mainly used to replenish the steam generator 1. In winter, the water temperature from the water softener 9 is relatively low, and the water flow rate can meet the requirement of cooling the wine to below 35°C. However, in the hot summer season, when the soft water temperature from the water softener 9 is high, the water flow rate cannot meet the requirement of cooling the wine to below 35°C. The present invention also provides a solenoid valve 22 and a self-acting pressure control valve 23 to solve this problem.

[0026] The present invention solves the problem of cooling the wine to below 35°C through the following specific method: when the PLC detects that the temperature of the wine outlets 15 and 12 in the wine waste heat recovery sections 16 and 12 is higher than 35°C, the solenoid valve 22 is automatically opened to allow part of the soft water to flow into the heat storage tank, thereby increasing the soft water flow entering the wine waste heat recovery sections 16 and 12 and cooling the wine to below 35°C.

[0027] The purpose of the self-operated pressure control valve 23 provided in the present invention is that when the solenoid valve 22 is opened, the self-operated pressure control valve 23 can automatically adjust the pressure before the valve to ensure that the pressure before the valve is always higher than the minimum pressure required to replenish water to the steam generator 1, while effectively cooling the wine, it can continue to replenish water to the steam generator 1.

[0028] The steam and heat recovery system for a wine distillation process of the present invention also solves the following problems:

[0029] When the heat recovered in the wine vapor latent heat recovery sections 19 and 10 exceeds the system requirement, the water temperature in the heat storage tank 24 will continue to rise. When the temperature exceeds 63°C, the PLC will also open the solenoid valve 22 to inject low-temperature water into the heat storage tank to lower the temperature in the heat storage tank.

[0030] The hot water in the hot water storage tank 24 can also be supplied to the wine workers for bathing or other purposes. When the water level in the hot water storage tank is lower than the set value, the solenoid valve 22 will automatically open to replenish the hot water storage tank.

[0031] In a steam and heat recovery system of a wine distillation process of the present invention, temperature sensors are installed at the wine vapor inlets of the wine vapor latent heat recovery sections 19 and 10, and the PLC can automatically determine whether the wine vapor latent heat recovery sections 19 and 10 are in operation. If the wine vapor latent heat recovery sections 19 or 10 are not in operation, the PLC will automatically close the solenoid valve 18 or the solenoid valve 14 to cut off the low-temperature soft water of the corresponding wine waste heat recovery section to ensure that the water temperature for replenishing the steam generator 1 will not be affected.

[0032] In a steam and heat recovery system for a wine distillation process of the present invention, the PLC can control the opening or closing of the solenoid valves 28 and 27 by detecting whether the heat recovery unit (or module) is running, so that the soft water from the wine waste heat recovery sections 16 and 12 only enters the recooler of the running heat recovery unit (or module), thereby ensuring that the make-up water temperature entering the steam generator 1 is always at a high value.

[0033] The present invention is specially designed for a direct-heated steam generator for pentafluoropropane R245fa used in a wine distillation process, which is characterized in that a heat exchanger coiled in the form of mosquito coils is used, which can correspond to multiple independent heat recovery systems using pentafluoropropane R245fa as a heat medium. A high-temperature resistant capacitive level gauge, a temperature probe blind pipe, a pressure transmitter and a safety valve are installed on the top of the steam generator. The capacitive level gauge has high accuracy, is not affected by bubbles on the water level when water evaporates, has its own water level display and can output a 4-20mA signal to the PLC for water level control. A PT100 temperature sensor is installed in the temperature probe blind pipe for target temperature control of the heat recovery unit. The pressure transmitter is used for pressure monitoring, has its own pressure display and can output a 4-20mA signal to the PLC for pressure monitoring and alarm. The safety valve is the last safety protection device to ensure that the equipment will not operate beyond the safety pressure and protect the safety of the equipment and personnel. The water supply port of the steam generator is also equipped with a check valve 3 to prevent high-temperature water from flowing back into the water supply pipe when the water supply pressure is lower than the pressure in the steam generator.

[0034] The present invention is a wine cooler specially designed for heat recovery in the wine distillation process. The wine cooler is characterized by comprising a wine vapor latent heat recovery section and a wine liquid waste heat recovery section. Both the wine vapor latent heat recovery section and the wine liquid waste heat recovery section use 316L stainless steel pipes as heat exchange pipes. The pipes are wound in a slanted downward winding manner and can be wound in a clockwise or counterclockwise direction to ensure that the wine can flow out of the wine cooler completely and smoothly without causing wine accumulation.

[0035] The steam and heat recovery system for the wine distillation process provided by the present invention has good actual operation effect, fully recycles and utilizes the waste heat in the traditional wine making process, so that the waste heat can be recycled, and does not discharge cooling water, carbon dioxide and harmful gases produced by combustion, which greatly saves non-renewable energy and water resources, and achieves good energy conservation, emission reduction and environmental protection effects. The system saves more than 50% energy compared with electric boilers. In places where there is waste heat, it can partially or completely replace electric boilers or coal-fired, gas-fired and biomass-fired steam boilers, which can play a good role in environmental protection, energy conservation, emission reduction and carbon emission reduction, and bring considerable economic and social benefits. FIG. 1 is a schematic diagram of a steam and heat recovery system for a wine distillation process of the present invention.

Claims

1. A steam and heat recovery system for a wine distillation process, characterized in that: The system includes: a heat recovery unit using pentafluoropropane R245fa as heat medium, a wine cooler for heat recovery, a direct-heated steam generator for pentafluoropropane R245fa, an air-energy water heater unit, an air-energy water heater pump, a heat storage tank, a water source pump, a water softener, solenoid valves and other valves and valve parts, pipes, pipe fittings and insulation materials, and a PLC control system.

2. A steam and heat recovery system for a wine distillation process according to claim 1, characterized in that: The heat recovery units (or modules) 31 and 32 using pentafluoropropane R245fa as heat medium are provided with economizers, which use stainless steel plate heat exchangers; the compressors of the heat recovery units (or modules) are provided with jet enthalpy increase; the heat recovery units (or modules) are also provided with subcoolers 30 and 29, which use stainless steel sleeve heat exchangers.

3. A steam and heat recovery system for wine distillation process according to claim 2, characterized in that: The wine cooler for heat recovery is composed of a wine vapor latent heat recovery section and a wine liquid waste heat recovery section. Both the wine vapor latent heat recovery section and the wine liquid waste heat recovery section use 316L stainless steel pipes as heat exchange pipes, and adopt a downward inclined winding winding method. It can be wound in a clockwise or counterclockwise direction to ensure that the wine can flow out of the wine cooler completely and smoothly without any wine accumulation.

4. A steam and heat recovery system for a wine distillation process according to claim 3, characterized in that: The direct-heated steam generator 1 for pentafluoropropane R245fa is characterized in that a heat exchanger coiled in the form of mosquito coils is used, which can correspond to multiple independent heat recovery systems using pentafluoropropane R245fa as heat medium. A high-temperature resistant capacitive level gauge, a temperature probe blind pipe, a pressure transmitter and a safety valve are installed on the top of the steam generator. The capacitive level gauge has high accuracy, is not affected by bubbles on the water level when water evaporates, has its own water level display and can output a 4-20mA signal to the PLC for water level control. A PT100 temperature sensor is installed in the temperature probe blind pipe for target temperature control of the heat recovery unit. The pressure transmitter is used for pressure monitoring, has its own pressure display and can output a 4-20mA signal to the PLC for pressure monitoring and alarm. The water supply port of the steam generator is also equipped with a check valve 3 to prevent high-temperature water from flowing back into the water supply pipe when the water supply pressure is lower than the pressure in the steam generator.

5. A steam and heat recovery system for wine distillation process according to claim 4, characterized in that: The water replenishment method of the direct-heated steam generator 1 is to use soft water from the water softener 9, which first enters the wine waste heat recovery sections 16 and 12 to exchange heat with the wine, and then enters the recoolers 30 and 29 of the heat recovery units (or modules) 31 and 32 to exchange heat with the high-temperature pentafluoropropane R245fa liquid from the direct-heated steam generator 1, and enters the steam generator at a temperature close to the water temperature in the steam generator, which not only improves the efficiency of the heat recovery unit, but also greatly reduces the impact of the replenishment water on the temperature in the steam generator.

6. A steam and heat recovery system for wine distillation process according to claim 5, characterized in that: The air energy water heater unit 25 is used as the initial heat source. By utilizing the high energy efficiency ratio of the air energy water heater unit, before the initial start-up of the heat recovery units (or modules) 31 and 32, the water temperature in the direct-heated steam generator 1 and the water storage tank 24 is heated to 75°C and 60°C respectively, to ensure the normal and efficient operation of the heat recovery units (or modules) 31 and 32.

7. A steam and heat recovery system for wine distillation process according to claim 6, characterized in that: The air source water heater unit 25 also solves the problem when waste heat recovery cannot fully meet the heat required by the system. When waste heat recovery cannot fully meet the heat required by the system, the air source water heater unit 25 and the air source water heater pump 26 will automatically start to supplement the heat source.

8. A steam and heat recovery system for wine distillation process according to claim 7, characterized in that: The solenoid valve 22 and the self-operated pressure control valve 23 are under the control of the PLC. When the PLC detects that the temperature of the wine outlets 15 and 12 in the wine waste heat recovery sections 16 and 12 is higher than 35°C, the solenoid valve 22 is automatically opened to allow part of the soft water to flow into the hot water storage tank, thereby increasing the soft water flow entering the wine waste heat recovery sections 16 and 12 and cooling the wine to below 35°C. At the same time, it is ensured that the water replenishment to the steam generator is not affected.

9. A steam and heat recovery system for wine distillation process according to claim 8, characterized in that: The solenoid valve 22 and the self-operated pressure control valve 23 are also used to replenish water to the hot water storage tank 24 .

10. A steam and heat recovery system for wine distillation process according to claim 9, characterized in that: The solenoid valve 22 and the self-operated pressure control valve 23, when the heat recovered in the wine vapor latent heat recovery sections 19 and 10 exceeds the system requirements, the water temperature in the heat storage tank 24 will continue to rise. When the temperature exceeds 63°C, the PLC will also open the solenoid valve 22 to inject low-temperature water into the heat storage tank to lower the temperature in the heat storage tank.

11. A steam and heat recovery system for wine distillation process according to claim 10, characterized in that: The wine vapor inlet of the wine vapor latent heat recovery sections 19 and 10 is equipped with a temperature sensor, and the PLC can automatically determine whether the wine vapor latent heat recovery sections 19 and 10 are in operation. If the wine vapor latent heat recovery sections 19 or 10 are not working, the PLC will automatically close the solenoid valve 18 or the solenoid valve 14 to cut off the low-temperature soft water of the corresponding wine waste heat recovery section.

12. A steam and heat recovery system for wine distillation process according to claim 11, characterized in that: The PLC can control the opening or closing of the solenoid valves 28 and 27 by detecting whether the heat recovery unit (or module) is running, so that the soft water from the wine waste heat recovery sections 16 and 12 only enters the recooler of the running heat recovery unit (or module), thereby ensuring that the make-up water temperature entering the steam generator 1 is always at a high value.

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