Energy-saving vacuum tube bundle drying system for white spirit vinasse

Abstract

The utility model discloses an energy-saving vacuum tube bundle drying system for white spirit vinasse, which comprises a vacuum tube bundle drying device, a waste gas washing device, a waste heat conversion device, a steam compression device and a condensate water tank. Waste gas generated in the drying process is dedusted and washed to serve as a heat source to heat soft water, water vapor is generated again, the water vapor is pressurized and heated and then jetted into the vacuum tube bundle drying machine to dry the white spirit vinasse, recycling of condensate water and recycling of waste heat in the waste gas are achieved, the whole drying process almost does not need live steam, and energy is saved. And almost no wastewater is discharged, so that energy conservation and emission reduction are really achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of distiller's grains treatment equipment generated in the process of Baijiu production, and particularly relates to an energy-saving vacuum tube bundle drying system for Baijiu distiller's grains. Background Art

[0002] In the process of Baijiu production, after the fermented mash is distilled to obtain alcohol, the distiller's grains liquid rich in protein is left. After the distiller's grains liquid undergoes solid-liquid separation, it is divided into filter residue and filtrate. The filter residue is the distiller's grains. Due to the action of fermenting microorganisms, the contents of protein, B vitamins, and amino acids in the distiller's grains are all higher than those in corn, and it contains unknown growth-promoting factors produced during fermentation. Therefore, currently, the treatment of distiller's grains usually involves drying the distiller's grains and using them to produce full distiller's grains dried feed. And the filtrate in the distiller's grains liquid is also dried after evaporation and concentration for producing full distiller's grains dried feed.

[0003] Currently, when Baijiu production enterprises dry Baijiu distiller's grains, they usually use a drum dryer or a fluidized bed dryer. The drum dryer uses air as the heat transfer medium, uses natural gas as the energy source to heat the air, and then sends the hot air into the drum to dry the distiller's grains in the drum. The fluidized bed dryer also uses air as the heat transfer medium, uses natural gas as the energy source to heat the air, the wet distiller's grains flow along the bed surface of the fluidized bed dryer, and the hot air passes through the bed surface from bottom to top. The wet distiller's grains on the bed surface are impacted by the hot air and turn up and down, mixing and colliding with each other. The wet distiller's grains exchange heat with the hot air to achieve the purpose of drying the distiller's grains.

[0004] However, whether it is a drum dryer or a fluidized bed dryer, it is necessary to heat the air through natural gas, resulting in a large consumption of natural gas and high heating costs. Moreover, a large amount of tail gas will be generated after the combustion of natural gas, and the tail gas emissions pollute the environment. Summary of the Utility Model

[0005] In summary, in order to overcome the deficiencies of the prior art problems, the utility model provides an energy-saving vacuum tube bundle drying system for Baijiu distiller's grains. It uses a vacuum tube bundle dryer to dry Baijiu distiller's grains. The waste gas generated during the drying process is used as a heat source to heat soft water after dust removal and washing, and water vapor is generated again. The water vapor is injected into the vacuum tube bundle dryer after pressurization and temperature increase to dry the Baijiu distiller's grains, realizing the recycling of condensed water and the recycling of waste heat in the waste gas. Almost no live steam is used in the whole drying process, and almost no wastewater is discharged, truly achieving energy conservation and emission reduction.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0007] An energy-saving vacuum tube bundle drying system for Baijiu distiller's grains, which includes a vacuum tube bundle drying device, an exhaust gas washing device, a waste heat conversion device, a steam compression device, and a condensate tank.

[0008] A vacuum tube bundle drying device uses live steam or / and compressed steam as a heat exchange medium to heat and dry distillers' grains of white liquor. The steam inlet of the vacuum tube bundle drying device is connected to the air outlet of a steam compression device through a pipeline. The waste gas outlet of the vacuum tube bundle drying device is connected to the air inlet of a waste gas washing device through a pipeline. The condensate outlet of the vacuum tube bundle drying device is connected to the water inlet of a condensate tank through a pipeline. The discharge outlet of the vacuum tube bundle drying device is connected to a pneumatic conveying and packaging device through a pipeline.

[0009] A waste gas washing device dust-removes and washes the waste gas generated by the vacuum tube bundle drying device. The air outlet of the waste gas washing device is connected to the air inlet of a waste heat conversion device through a pipeline.

[0010] A waste heat conversion device uses the waste gas after dust-removing and washing to heat condensate to generate steam. The waste gas outlet of the waste heat conversion device is connected to the air inlet of a vacuum pump through a pipeline, and the air outlet of the vacuum pump is emptied. The water inlet of the waste heat conversion device is connected to the water outlet of a condensate pump through a pipeline. The water inlet of the condensate pump is connected to the water outlet of the condensate tank through a pipeline. The steam outlet of the waste heat conversion device is connected to the air inlet of the steam compression device through a pipeline.

[0011] A steam compression device is used to pressurize and heat up the steam generated by the waste heat conversion device, and includes a steam compressor and a steam jet heat pump connected in series. The steam outlet of the waste heat conversion device is connected to the air inlet of the steam compressor through a pipeline. The air outlet of the steam compressor is connected to the air inlet of the steam jet heat pump through a pipeline. The air outlet of the steam jet heat pump is connected to the steam inlet of the vacuum tube bundle drying device through a pipeline. The air inlet of the steam jet heat pump is connected to a steam source through a pipeline.

[0012] A pneumatic conveying and packaging device is used to pneumatically convey, cool, dust-remove, collect and package the dried distillers' grains of white liquor.

[0013] Furthermore, the steam source is respectively connected to the steam inlet of the vacuum tube bundle dryer of the vacuum tube bundle drying device and the inner cavity of the housing of the vacuum tube bundle dryer through a supplementary gas pipeline to supplement steam to the inner cavity of the tube bundle or the inner cavity of the housing.

[0014] Furthermore, the steam compression device includes a plurality of steam compressors connected in series, and after the plurality of steam compressors are connected in series, they are connected in series with the steam jet heat pump.

[0015] Furthermore, a temperature sensor is provided on the pipeline connecting the air outlet of the steam jet heat pump and the steam inlet of the vacuum tube bundle drying device. An intake valve is provided on the pipeline connecting the steam source and the air inlet of the steam jet heat pump. The intake valve is electrically connected to the temperature sensor, and the intake valve is controlled and adjusted through the temperature sensor.

[0016] Further, the vacuum tube bundle drying device includes a feeding auger, a vacuum tube bundle dryer, a discharging auger, and a mixing auger. A feeding port is provided on one side of the vacuum tube bundle dryer, and a discharging port is provided on the other side. A steam inlet is provided on the rotating shaft on the side of the discharging port of the vacuum tube bundle dryer, and a condensate outlet is provided on the rotating shaft on the side of the feeding port of the vacuum tube bundle dryer. The feeding port of the vacuum tube bundle dryer is communicated with the discharging port of the feeding auger, and the discharging port of the vacuum tube bundle dryer is communicated with the feeding port of the discharging auger. An exhaust gas outlet is provided on the housing of the vacuum tube bundle dryer. The exhaust gas outlet is communicated with the air inlet of an exhaust gas washing device through a pipeline. The discharging port of the discharging auger is respectively communicated with the feeding port of the mixing auger and the feeding port of a pneumatic conveying and packaging device through pipelines. The air inlet of the mixing auger is communicated with the discharging port of the discharging auger and a wet white wine distillers' grains material source. The discharging port of the mixing auger is communicated with the feeding port of the feeding auger.

[0017] Further, both the feeding auger and the discharging auger are sealed augers.

[0018] Further, the exhaust gas washing device includes a washing tower and a washing water pump. The air inlet of the washing tower is communicated with the exhaust gas outlet of the vacuum tube bundle drying device through a pipeline. The air outlet of the washing tower is communicated with the air inlet of a waste heat conversion device through a pipeline. The water inlet of the washing tower is communicated with a primary water source through a pipeline. The spray water inlet of the washing tower is communicated with the water outlet of the washing water pump through a pipeline. The water inlet of the washing water pump is communicated with the water outlet of the washing tower through a pipeline.

[0019] Further, the water outlet of the washing water pump is communicated with the water inlet of a flushing water pump through a pipeline. The water outlet of the flushing water pump is communicated with the pipeline between the exhaust gas outlet of the vacuum tube bundle drying device and the air inlet of the exhaust gas washing device through a flushing pipeline.

[0020] Further, the air inlet of the washing tower is communicated with the air outlet of a condensate water tank through a pipeline.

[0021] Further, the waste heat conversion device includes a heat exchanger, a circulation pump, and a gas-liquid separator. The heat exchanger is a shell-and-tube heat exchanger. The air inlet of the heat exchanger is communicated with the air outlet of the exhaust gas washing device through a pipeline. The exhaust gas outlet of the heat exchanger is communicated with the air inlet of a vacuum pump through a pipeline. The exhaust gas after being washed by the exhaust gas washing device enters the shell side of the heat exchanger. The water inlet of the tube side of the heat exchanger is communicated with the water outlet of a condensate water pump through a pipeline. The water outlet of the tube side of the heat exchanger is communicated with the water inlet of the circulation pump through a pipeline. The water outlet of the circulation pump is communicated with the circulating water inlet of the heat exchanger through a pipeline. The tube side of the heat exchanger is communicated with the feeding port of the gas-liquid separator. The air outlet of the gas-liquid separator is communicated with the air inlet of a steam compression device through a pipeline. The liquid outlet of the gas-liquid separator is communicated with the water inlet of the circulation pump.

[0022] Further, the water outlet of the circulation pump is communicated with the water inlet of the scrubbing tower of the waste gas scrubbing device through a water outlet pipeline. An outlet valve is arranged on the water outlet pipeline. A water level gauge for detecting the water level in the tube side is arranged on the heat exchanger. The water level gauge is electrically connected to the outlet valve, and the outlet valve is controlled and adjusted through the water level gauge.

[0023] Further, the condensed water outlet of the shell side of the heat exchanger is communicated with the water inlet of the scrubbing tower of the waste gas scrubbing device through a pipeline.

[0024] Further, the pneumatic conveying and packaging device includes an air heat exchanger, a primary pneumatic conveying pipeline, a primary fan, a primary cyclone collector, a primary dust collector, a secondary cyclone collector, a secondary pneumatic conveying pipeline, a secondary dust collector, a secondary fan, a silo and a packaging machine. The air inlet of the air heat exchanger is communicated with the atmosphere. The air outlet of the air heat exchanger is communicated with the air inlet of the primary cyclone collector through the primary pneumatic conveying pipeline. The exchange medium inlet of the air heat exchanger is communicated with the water outlet of the scrubbing water pump of the waste gas scrubbing device through a medium pipeline. The exchange medium outlet of the air heat exchanger is communicated with the sewage treatment device. The air outlet of the primary cyclone collector is communicated with the air inlet of the primary dust collector through a pipeline. The air outlet of the primary dust collector is communicated with the air inlet of the primary fan through a pipeline. The air outlet of the primary fan is emptied. The discharge port of the primary cyclone collector is communicated with the air inlet of the secondary cyclone collector through the secondary pneumatic conveying pipeline. The air outlet of the secondary cyclone collector is communicated with the air inlet of the secondary dust collector through a pipeline. The air outlet of the secondary dust collector is communicated with the air inlet of the secondary fan through a pipeline. The air outlet of the secondary fan is emptied. The dust outlet of the primary dust collector is communicated with the secondary pneumatic conveying pipeline through a pipeline. The dust outlet of the secondary dust collector and the discharge port of the secondary cyclone collector are both communicated with the feed inlet of the silo. The discharge port of the silo is communicated with the packaging machine.

[0025] The beneficial effects of the present utility model are as follows:

[0026] 1. The present utility model adopts vacuum tube bundle drying to dry the white wine distiller's grains. The waste gas generated during the drying process is used as a heat source to heat soft water after dust removal and washing, and water vapor is generated again. The water vapor is injected into the vacuum tube bundle dryer after pressurization and temperature increase to dry the white wine distiller's grains, realizing the recycling of condensed water and the recycling of waste heat in the waste gas. Almost no live steam is used in the whole drying process, and almost no waste water is discharged, truly achieving energy conservation and emission reduction.

[0027] 2. After the waste gas generated by the vacuum tube bundle dryer of the present utility model is washed and dedusted, it enters the heat exchanger of the waste heat conversion device, and the waste gas after washing and dedusting is used to heat the condensed water generated by the vacuum tube bundle dryer. The condensed water is heated and evaporated to generate steam again. Since the temperature of the waste gas generated by the vacuum tube bundle dryer decreases after washing, the steam generated by heating the condensed water with this waste gas as the heat source has a relatively low temperature. Therefore, after the low-temperature steam is compressed, pressurized, and heated up by a series-connected steam compressor, and then pressurized and heated up again by a steam jet heat pump, it enters the vacuum tube bundle dryer. The low-temperature steam is pressurized and heated up multiple times, and the temperature of the heated steam can reach above 130 °C, becoming high-temperature steam. This temperature is sufficient to meet the drying requirements of wet distillers' grains. This steam enters the vacuum tube bundle dryer to evaporate and dry the wet distillers' grains, and the generated waste gas is washed and dedusted again. This cycle repeats. The live steam provided by the steam source in the whole process is only used at the initial operation of the system and as supplementary steam, and the consumption of live steam is very small, which can effectively reduce the energy consumption required for producing live steam. Moreover, the condensed water generated by the vacuum tube bundle dryer is also recycled, reducing energy consumption. The condensed water contains almost no minerals, and almost no scale is generated when heating the condensed water, which forms a protection for the heat exchange tubes of the heat exchanger and the tubes of the vacuum tube bundle dryer, avoiding scale from condensing on the inner wall of the pipeline and protecting the pipeline. Therefore, the present utility model has extremely low energy consumption, stable equipment operation, and low maintenance and repair costs, thus effectively reducing the drying cost of liquor distillers' grains and improving the market competitiveness of the enterprise.

[0028] 3. Multiple waste gas outlets can be provided on the shell of the vacuum tube bundle dryer of the present utility model. The multiple waste gas outlets can be connected to the waste gas washing device through the same pipeline. Then, the waste gas in the shell of the vacuum tube bundle dryer is discharged through the multiple waste gas outlets, thereby reducing the flow rate of the waste gas and preventing the waste gas from carrying the powdery distillers' grains in the vacuum tube bundle dryer, thus improving the recovery rate of the dried distillers' grains and reducing the waste of raw materials.

[0029] 4. The vacuum tube bundle dryer of the present utility model dries wet distillers' grains under vacuum conditions. The temperature of the steam required during drying is relatively low, and there will be no charring phenomenon, ensuring the quality of the dried distillers' grains, not damaging the protein substances in the distillers' grains, and at the same time, no charred waste gas will be generated.

[0030] 5. The temperature of the washing water in the washing tower of the present utility model is used to heat the air entering the air heat exchanger, thereby reducing the humidity and increasing the temperature of the air for pneumatically conveying distillers' grains. Thus, it can effectively avoid the influence of water vapor in the air on the dried distillers' grains, prevent the distillers' grains from getting damp and caking during the pneumatic conveying process, and can further dry the material during the pneumatic conveying process. At the same time, the temperature of the dried distillers' grains is relatively high, and the temperature of the heated air is lower than that of the dried distillers' grains. Therefore, during the pneumatic conveying process, the pneumatically conveyed air cools down the dried distillers' grains.

[0031] 6. The scrubbing tower of the present utility model is connected to the waste steam pipeline through a flushing water pump, and can, after production is completed, use the scrubbing water in the scrubbing tower to flush the vacuum tube bundle dryer. The air outlet of the condensate tank of the present utility model is connected to the air inlet of the scrubbing tower. There is a small amount of steam in the condensate tank, and this steam is transported into the scrubbing tower and then enters the heat exchanger of the waste heat converter together with the waste gas after scrubbing to participate in heating the condensate. Such an arrangement can recover the small amount of steam generated in the condensate, fully recover the heat, and reduce energy waste. The condensate outlet of the shell side of the heat exchanger of the present utility model enters the scrubbing tower for use as scrubbing water. A water level gauge for detecting the water level in the tube side is provided on the heat exchanger, and the water level gauge is electrically connected to the water outlet valve. The water outlet valve is controlled and adjusted through the water level gauge. When the water level in the tube side of the heat exchanger is too high, the excess water enters the scrubbing tower through the water outlet pipeline for use as scrubbing water. Such equipment can achieve the full utilization of the recovered condensate, reduce the supplement of fresh water, and save water resources.

[0032] 7. The present utility model has a simple structure, is easy to use, has a low cost, and a wide application range. It can realize the recovery and utilization of the waste heat of the waste gas and the condensate generated during the drying of the tube bundle, thereby effectively reducing energy consumption, reducing the emissions of waste gas and water, saving water resources, and achieving the purpose of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0034] The present utility model will be further described in detail below with reference to the drawings.

[0035] As Figure 1 shown, a vacuum tube bundle drying system for energy-saving of liquor distiller's grains includes a vacuum tube bundle drying device, an exhaust gas scrubbing device, a waste heat conversion device, a steam compression device, and a condensate tank 17.

[0036] The described vacuum tube bundle drying device uses live steam or / and compressed steam as the heat exchange medium to heat and dry distiller's grains of Baijiu. The vacuum tube bundle drying device includes a feeding auger 13, a vacuum tube bundle dryer 12, a discharging auger 14, and a mixing auger 15. One side of the vacuum tube bundle dryer 12 is provided with a feeding port, and the other side is provided with a discharging port. A steam inlet is provided on the rotating shaft on the side of the discharging port of the vacuum tube bundle dryer 12, and the steam inlet is connected to the air outlet of the steam compression device through a pipeline. A condensate outlet is provided on the rotating shaft on the side of the feeding port of the vacuum tube bundle dryer 12. The feeding port of the vacuum tube bundle dryer 12 is connected to the discharging port of the feeding auger 13, and the discharging port of the vacuum tube bundle dryer 12 is connected to the feeding port of the discharging auger 14. An exhaust gas outlet is provided on the shell of the vacuum tube bundle dryer 12. The number of the exhaust gas outlets is multiple, and multiple exhaust gas outlets are all connected to an exhaust gas recovery pipeline 16. The exhaust gas outlet is connected to the air inlet of the exhaust gas washing device through a pipeline. The discharging port of the discharging auger 14 is respectively connected to the feeding port of the mixing auger 15 and the feeding port of the pneumatic conveying and packaging device through pipelines. The air inlet of the mixing auger 15 is connected to the discharging port of the discharging auger 14 and the wet distiller's grains of Baijiu material source. The discharging port of the mixing auger 15 is connected to the feeding port of the feeding auger 13. The feeding auger 13 and the discharging auger 14 are both sealed augers.

[0037] The exhaust gas recovery pipeline 16 connects the exhaust gas outlet of the vacuum tube bundle dryer 12 and the air inlet of the exhaust gas washing device. The exhaust gas washing device dusts and washes the exhaust gas generated by the vacuum tube bundle drying device. The exhaust gas washing device includes a washing tower 5 and a washing water pump 6. The exhaust gas recovery pipeline 16 is connected to the air inlet of the washing tower 5. The air outlet of the washing tower 5 is connected to the air inlet of the waste heat conversion device through a pipeline. The water inlet of the washing tower 5 is connected to the primary water source through a pipeline. The spray water inlet of the washing tower 5 is connected to the water outlet of the washing water pump 6 through a pipeline. The water inlet of the washing water pump 6 is connected to the water outlet of the washing tower 5 through a pipeline. The water outlet of the washing water pump 6 is connected to the water inlet of a flushing water pump 7 through a pipeline. The water outlet of the flushing water pump 7 is connected to the pipeline between the exhaust gas outlet of the vacuum tube bundle dryer and the air inlet of the exhaust gas washing device through a flushing pipeline. The air inlet of the washing tower 5 is also connected to the air outlet of a condensate tank 17 through a pipeline. The steam contained in the condensate after the steam in the vacuum tube bundle dryer 12 condenses also enters the washing tower 5.

[0038] The waste heat conversion device uses the waste gas after dust removal and washing to heat the condensed water to generate steam. The waste heat conversion device includes a heat exchanger 1, a circulation pump 2 and a gas-liquid separator 3. The heat exchanger 1 is a shell-and-tube heat exchanger. The air inlet of the heat exchanger 1 is connected to the air outlet of the waste gas washing device through a pipeline. The waste gas outlet of the heat exchanger 1 is connected to the air inlet of a vacuum pump 4 through a pipeline. The air outlet of the vacuum pump 4 is emptied. The waste gas after being washed by the waste gas washing device enters the shell side of the heat exchanger 1. The water inlet of the tube side of the heat exchanger 1 is connected to the water outlet of a condensate pump 18 through a pipeline. The water inlet of the condensate pump 18 is connected to the water outlet of a condensate tank 17 through a pipeline. The water outlet of the tube side of the heat exchanger 1 is connected to the water inlet of the circulation pump 2 through a pipeline. The water outlet of the circulation pump 2 is connected to the circulating water inlet of the heat exchanger 1 through a pipeline. The tube side of the heat exchanger 1 is connected to the feed inlet of the gas-liquid separator 3. The air outlet of the gas-liquid separator 3 is connected to the air inlet of the steam compression device through a pipeline. The liquid outlet of the gas-liquid separator 3 is connected to the water inlet of the circulation pump 2. The water outlet of the circulation pump 2 is connected to the water inlet of a scrubbing tower 5 of the waste gas washing device through a water outlet pipeline 33. A water outlet valve 35 is provided on the water outlet pipeline 33. A water level gauge 34 for detecting the water level of the tube side is provided on the heat exchanger 1. The water level gauge 34 is electrically connected to the water outlet valve 35, and the water outlet valve 35 is controlled and adjusted through the water level gauge 34. The condensate outlet of the shell side of the heat exchanger 1 is connected to the water inlet of the scrubbing tower 5 of the waste gas washing device through a pipeline.

[0039] The described steam compression device is used to boost the pressure and increase the temperature of the water vapor generated by the waste heat conversion device. It includes two steam compressors and a steam jet heat pump 10. The two steam compressors are the first steam compressor 8 and the second steam compressor 9 respectively. The first steam compressor 8, the second steam compressor 9 and the steam jet heat pump 10 are connected in series in sequence. The air outlet of the gas-liquid separator 3 of the waste heat conversion device is connected to the air inlet of the first steam compressor 8 through a pipeline. The air outlet of the first steam compressor 8 is connected to the air inlet of the second steam compressor 9 through a pipeline. The air outlet of the second steam compressor 9 is connected to the air inlet of the steam jet heat pump 10 through a pipeline. The air outlet of the steam jet heat pump 10 is connected to the steam inlet of the vacuum tube bundle dryer 12 of the vacuum tube bundle drying device through a pipeline. The air inlet of the steam jet heat pump 10 is also connected to the air outlet of the steam source 11 through a pipeline. The steam source 11 is respectively connected to the steam inlet of the vacuum tube bundle dryer 12 of the vacuum tube bundle drying device and the inner cavity of the housing of the vacuum tube bundle dryer 12 through a supplementary gas pipeline 19 to supplement steam to the inner cavity of the tube bundle or the inner cavity of the housing. A temperature sensor 20 is provided on the pipeline connecting the air outlet of the steam jet heat pump 10 and the steam inlet of the vacuum tube bundle dryer 12 of the vacuum tube bundle drying device. An intake valve 21 is provided on the pipeline connecting the steam source 11 and the air inlet of the steam jet heat pump 10. The intake valve 21 is electrically connected to the temperature sensor 20, and the intake valve 21 is controlled and adjusted by the temperature sensor 20.

[0040] The discharge opening of the discharge auger 14 of the vacuum tube bundle dryer 12 of the described vacuum tube bundle drying device is connected to the feed opening of the pneumatic conveying and packaging device through a pipeline. The pneumatic conveying and packaging device is used for pneumatically conveying, cooling, dust removing, collecting and packaging the dried distillers grains. The pneumatic conveying and packaging device includes an air heat exchanger 22, a primary pneumatic conveying pipeline 23, a primary fan 24, a primary cyclone collector 25, a primary dust collector 26, a secondary cyclone collector 28, a secondary pneumatic conveying pipeline 27, a secondary dust collector 29, a secondary fan 30, a silo 31 and a packaging machine 32. The air inlet of the air heat exchanger 22 is connected to the atmosphere, and the air outlet of the air heat exchanger 22 is connected to the air inlet of the primary cyclone collector 25 through the primary pneumatic conveying pipeline 23. The exchange medium inlet of the air heat exchanger 22 is connected to the water outlet of the washing water pump 6 of the waste gas washing device through a medium pipeline, and the exchange medium outlet of the air heat exchanger 22 is connected to the sewage treatment device. The air outlet of the primary cyclone collector 25 is connected to the air inlet of the primary dust collector 26 through a pipeline, the air outlet of the primary dust collector 26 is connected to the air inlet of the primary fan 24 through a pipeline, and the air outlet of the primary fan 24 is emptied. The discharge outlet of the primary cyclone collector 25 is connected to the air inlet of the secondary cyclone collector 28 through the secondary pneumatic conveying pipeline 27. The air outlet of the secondary cyclone collector 28 is connected to the air inlet of the secondary dust collector 29 through a pipeline, the air outlet of the secondary dust collector 29 is connected to the air inlet of the secondary fan 30 through a pipeline, and the air outlet of the secondary fan 30 is emptied. The dust outlet of the primary dust collector 26 is connected to the secondary pneumatic conveying pipeline 27 through a pipeline. The dust outlet of the secondary dust collector 29 and the discharge outlet of the secondary cyclone collector 28 are both connected to the feed inlet of the silo 31, and the discharge outlet of the silo 31 is connected to the packaging machine 32.

[0041] During use, start the vacuum tube bundle dryer 12, start the feed auger 13, the mixing auger 15 and the discharge auger 14, and turn on the steam source 11. The high-temperature live steam of the steam source 11 is injected into the inner cavity of the tube bundle of the vacuum tube bundle dryer 12 under the action of the steam jet heat pump 10. The wet distillers grains are fed into the mixing auger 15, conveyed by the mixing auger 15 to the feed auger 13, and then conveyed by the feed auger 13 to enter the inner cavity of the housing of the vacuum tube bundle dryer 12 from the feed opening of the vacuum tube bundle dryer 12. In the vacuum tube bundle dryer 12, the wet distillers grains exchange heat with the live steam. The live steam dissipates heat, cools down and condenses, and the wet distillers grains absorb heat. The moisture in the wet distillers grains evaporates into waste gas, and the wet distillers grains are dried. The live steam cools down and condenses into condensed water, and then enters the condensate tank 17 for collection. The waste gas enters the waste gas recovery pipeline 16 through the waste gas outlet.

[0042] Start the condensate pump 18. The condensate water in the condensate water tank 17 enters the tube side of the heat exchanger 1 under the action of the condensate pump 18. Start the vacuum pump 4. Under the action of the vacuum pump 4, in the shell of the vacuum tube bundle dryer 12, the waste gas evaporated during the drying process of the wet distillers grains enters the waste gas recovery pipeline from the waste gas outlet, and enters the scrubbing tower 5 along the waste gas recovery pipeline 16. Under the action of the circulating washing water in the scrubbing tower 5, part of the dust materials carried in the waste gas are washed, the temperature of the washing water rises, and the temperature of the waste gas drops. The washed waste gas enters the shell side of the heat exchanger 1. In the heat exchanger 1, the waste gas exchanges heat with the condensate water. The condensate water is heated again to generate water vapor, the waste gas cools and condenses into waste gas condensate water, and the waste gas condensate water enters the scrubbing tower 5 and is collected as the washing water for washing the waste gas. The non-condensable gas flows out from the waste gas outlet of the heat exchanger 1 and is discharged under the action of the vacuum pump 4. The water vapor generated by heating the condensate water in the heat exchanger 1 by the waste gas enters the gas-liquid separator 3 for gas-liquid separation. The separated water vapor enters the first steam compressor 8 and the second steam compressor 9 in sequence along the pipeline, is compressed and heated twice, and then enters the steam jet heat pump 10. Under the action of the steam jet heat pump 10, it is sprayed into the tube bundle of the vacuum tube bundle dryer 12 to dry the wet distillers grains. In this way, the waste gas and condensate water generated during the tube bundle drying process of the wet distillers grains are recycled and reused.

[0043] The wet distillers grains dried by the vacuum tube bundle dryer 12 are discharged from the discharge port and enter the discharge auger 14. Part of the dried distillers grains enters the mixing auger 15. In the mixing auger 15, the dried distillers grains and the wet distillers grains are evenly mixed during the conveying process to realize the preheating of the wet distillers grains. Another part of the dried distillers grains enters the primary pneumatic conveying pipeline 23. The washing water pump 6 sends part of the washing water with temperature into the air heat exchanger 1. In the air heat exchanger 1, the washing water exchanges heat with the air, the air temperature rises, and the humidity drops. Under the action of the primary fan 24, the dried distillers grains and the heated and dried air entering the primary pneumatic conveying pipeline 23 enter the primary cyclone collector 25 along the primary pneumatic conveying pipeline 23. In the primary cyclone collector 25, the dried distillers grains are collected, and then enter the secondary pneumatic conveying pipeline under the action of the airtight discharging device at the lower discharge port of the primary cyclone collector 25. The air flow flowing out of the primary cyclone collector 25 enters the primary dust collector 26 to remove the dust materials in the air flow. The dust-free air is discharged by the primary fan 24, and the dust materials recovered by the primary dust collector 26 also enter the secondary pneumatic conveying pipeline.

[0044] Under the action of the secondary fan 30, the dried distillers grains entering the secondary air conveying pipeline enter the secondary cyclone collector 28 along the secondary air conveying pipeline. The dried distillers grains are collected in the secondary cyclone collector 28 and then enter the silo 31 for collection under the action of the airtight discharger at the lower discharge port of the secondary cyclone collector 28. The air flow flowing out of the secondary cyclone collector 28 enters the secondary dust collector 29 to remove the dust materials in the air flow. The air after dust removal is discharged into the air by the secondary fan 30. The dust materials recovered by the secondary dust collector 29 also enter the silo 31 for collection. The dried distillers grains collected in the silo 31 can enter the packaging machine 32 for packaging from the discharge port at the lower end of the silo 31.

[0045] After the water steam in the tube bundle of the vacuum tube bundle dryer 12 exchanges heat with the wet distillers grains, the water steam condenses into condensed water, and the condensed water enters the condensed water tank 17 for collection. The non-condensable water steam in the tube bundle also enters the condensed water tank 17 and flows out from the air outlet of the condensed water tank 17, and then enters the washing tower 5. After being washed in the washing tower 5, it enters the heat exchanger 1 together with the washed waste gas for waste heat recovery.

[0046] When a production is completed, the flushing water pump 7 can be turned on, and flushing water is introduced into the shell of the vacuum tube bundle dryer 12 through the flushing pipeline and the waste steam recovery pipeline, so as to flush and clean the vacuum tube bundle dryer 12.

[0047] It should be noted that the above-described embodiments are illustrative rather than restrictive of the technical solutions of the present invention. Any equivalent replacement by those of ordinary skill in the art or other modifications made according to the prior art, as long as they do not exceed the scope and concept of the technical solutions of the present invention, shall be included within the scope of the claims required by the present invention.

Claims

1. An energy-saving vacuum tube bundle drying system for liquor distiller's grains, characterized in that: It includes a vacuum tube bundle drying device, an exhaust gas washing device, a waste heat conversion device, a steam compression device and a condensate water tank (17). The vacuum tube bundle drying device uses live steam or / and compressed steam as a heat exchange medium to heat and dry the distiller's grains of white liquor. The steam inlet of the vacuum tube bundle drying device is connected to the air outlet of the steam compression device through a pipeline. The exhaust gas outlet of the vacuum tube bundle drying device is connected to the air inlet of the exhaust gas washing device through a pipeline. The condensate water outlet of the vacuum tube bundle drying device is connected to the water inlet of the condensate water tank (17) through a pipeline. The discharge outlet of the vacuum tube bundle drying device is connected to the pneumatic conveying and packaging device through a pipeline. The exhaust gas washing device dust-removes and washes the exhaust gas generated by the vacuum tube bundle drying device. The air outlet of the exhaust gas washing device is connected to the air inlet of the waste heat conversion device through a pipeline. The waste heat conversion device uses the exhaust gas after dust-removing and washing to heat the condensate water to generate steam. The exhaust gas outlet of the waste heat conversion device is connected to the air inlet of the vacuum pump (4) through a pipeline. The air outlet of the vacuum pump (4) is emptied. The water inlet of the waste heat conversion device is connected to the water outlet of the condensate water pump (18) through a pipeline. The water inlet of the condensate water pump (18) is connected to the water outlet of the condensate water tank (17) through a pipeline. The steam outlet of the waste heat conversion device is connected to the air inlet of the steam compression device through a pipeline. The steam compression device is used to pressurize and heat up the steam generated by the waste heat conversion device. It includes a steam compressor and a steam jet heat pump (10) connected in series. The steam outlet of the waste heat conversion device is connected to the air inlet of the steam compressor through a pipeline. The air outlet of the steam compressor is connected to the air inlet of the steam jet heat pump (10) through a pipeline. The air outlet of the steam jet heat pump (10) is connected to the steam inlet of the vacuum tube bundle drying device through a pipeline. The air inlet of the steam jet heat pump (10) is connected to a steam source (11) through a pipeline. The pneumatic conveying and packaging device is used to pneumatically convey, cool, dust-remove and collect and package the dried distiller's grains of white liquor.

2. The energy-saving vacuum tube bundle drying system for liquor lees according to claim 1, wherein: The steam source (11) is respectively connected to the steam inlet of the vacuum tube bundle dryer (12) of the vacuum tube bundle drying device and the inner cavity of the housing of the vacuum tube bundle dryer (12) through a supplementary gas pipeline (19) to supplement steam to the inner cavity of the tube bundle or the inner cavity of the housing.

3. The energy-saving vacuum tube bundle drying system for liquor lees according to claim 1, characterized in that: The steam compression device includes a plurality of steam compressors connected in series, and after the plurality of steam compressors are connected in series, they are connected in series with the steam jet heat pump (10).

4. The energy-saving vacuum tube bundle drying system for white liquor distiller's grains according to claim 1, wherein: A temperature sensor (20) is provided on the pipeline connecting the air outlet of the steam jet heat pump (10) to the steam inlet of the vacuum tube bundle drying device. An intake valve (21) is provided on the pipeline connecting the steam source (11) to the air inlet of the steam jet heat pump (10). The intake valve (21) is electrically connected to the temperature sensor (20), and the intake valve (21) is controlled and adjusted by the temperature sensor (20).

5. The energy-saving vacuum tube bundle drying system for liquor distillers' grains according to claim 1, wherein: The described vacuum tube bundle drying device includes a feeding auger (13), a vacuum tube bundle dryer (12), a discharging auger (14), and a mixing auger (15). The vacuum tube bundle dryer (12) has a feeding port on one side and a discharging port on the other side. A steam inlet is provided on the rotating shaft on the side of the discharging port of the vacuum tube bundle dryer (12), and a condensate outlet is provided on the rotating shaft on the side of the feeding port of the vacuum tube bundle dryer (12). The feeding port of the vacuum tube bundle dryer (12) is communicated with the discharging port of the feeding auger (13), the discharging port of the vacuum tube bundle dryer (12) is communicated with the feeding port of the discharging auger (14), and an exhaust gas outlet is provided on the shell of the vacuum tube bundle dryer (12). The exhaust gas outlet is communicated with the intake port of the exhaust gas washing device through a pipeline. The discharging port of the discharging auger (14) is respectively communicated with the feeding port of the mixing auger (15) and the feeding port of the pneumatic conveying and packaging device through pipelines. The intake port of the mixing auger (15) is communicated with the discharging port of the discharging auger (14) and the wet white wine distiller's grains material source, and the discharging port of the mixing auger (15) is communicated with the feeding port of the feeding auger (13).

6. The energy-saving vacuum tube bundle drying system for liquor distiller's grains according to claim 1, wherein: The described exhaust gas washing device includes a washing tower (5) and a washing water pump (6). The intake port of the washing tower (5) is communicated with the exhaust gas outlet of the vacuum tube bundle drying device through a pipeline. The outlet of the washing tower (5) is communicated with the intake port of the waste heat conversion device through a pipeline. The water inlet of the washing tower (5) is communicated with a primary water source through a pipeline. The spray water inlet of the washing tower (5) is communicated with the outlet of the washing water pump (6) through a pipeline. The inlet of the washing water pump (6) is communicated with the outlet of the washing tower (5) through a pipeline.

7. The energy-saving vacuum tube bundle drying system for white liquor distiller's grains according to claim 1, wherein: The described waste heat conversion device includes a heat exchanger (1), a circulation pump (2), and a gas-liquid separator (3). The heat exchanger (1) is a shell-and-tube heat exchanger. The intake port of the heat exchanger (1) is communicated with the outlet of the exhaust gas washing device through a pipeline. The exhaust gas outlet of the heat exchanger (1) is communicated with the intake port of a vacuum pump (4) through a pipeline. The exhaust gas after being washed by the exhaust gas washing device enters the shell side of the heat exchanger (1). The water inlet of the tube side of the heat exchanger (1) is communicated with the outlet of a condensate pump (18) through a pipeline. The water outlet of the tube side of the heat exchanger (1) is communicated with the inlet of the circulation pump (2) through a pipeline. The outlet of the circulation pump (2) is communicated with the circulating water inlet of the heat exchanger (1) through a pipeline. The tube side of the heat exchanger (1) is communicated with the feeding port of the gas-liquid separator (3). The outlet of the gas-liquid separator (3) is communicated with the intake port of the steam compression device through a pipeline. The liquid outlet of the gas-liquid separator (3) is communicated with the inlet of the circulation pump (2).

8. The energy-saving vacuum tube bundle drying system for white liquor distiller's grains according to claim 7, wherein: The outlet of the circulation pump (2) is communicated with the water inlet of the washing tower (5) of the exhaust gas washing device through a water outlet pipeline (33). A water outlet valve (35) is provided on the water outlet pipeline (33). A water level gauge (34) for detecting the water level of the tube side is provided on the heat exchanger (1). The water level gauge (34) is electrically connected to the water outlet valve (35), and the water outlet valve (35) is controlled and adjusted through the water level gauge (34).

9. The energy-saving vacuum tube bundle drying system for white liquor distiller's grains according to claim 1, characterized in that: The described air-supply packaging device includes an air heat exchanger (22), a primary air-supply pipeline (23), a primary fan (24), a primary cyclone dust collector (25), a primary dust remover (26), a secondary cyclone dust collector (28), a secondary air-supply pipeline (27), a secondary dust remover (29), a secondary fan (30), a silo (31) and a packaging machine (32). The air inlet of the air heat exchanger (22) is connected to the atmosphere, and the air outlet of the air heat exchanger (22) is connected to the air inlet of the primary cyclone dust collector (25) through the primary air-supply pipeline (23). The exchange medium inlet of the air heat exchanger (22) is connected to the water outlet of the washing water pump (6) of the waste gas washing device through a medium pipeline, and the exchange medium outlet of the air heat exchanger (22) is connected to the sewage treatment device. The air outlet of the primary cyclone dust collector (25) is connected to the air inlet of the primary dust remover (26) through a pipeline. The air outlet of the primary dust remover (26) is connected to the air inlet of the primary fan (24) through a pipeline. The air outlet of the primary fan (24) is emptied. The discharge port of the primary cyclone dust collector (25) is connected to the air inlet of the secondary cyclone dust collector (28) through the secondary air-supply pipeline (27). The air outlet of the secondary cyclone dust collector (28) is connected to the air inlet of the secondary dust remover (29) through a pipeline. The air outlet of the secondary dust remover (29) is connected to the air inlet of the secondary fan (30) through a pipeline. The air outlet of the secondary fan (30) is emptied. The dust outlet of the primary dust remover (26) is connected to the secondary air-supply pipeline (27) through a pipeline. The dust outlet of the secondary dust remover (29) and the discharge port of the secondary cyclone dust collector (28) are both connected to the feed inlet of the silo (31). The discharge port of the silo (31) is connected to the packaging machine (32).

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