A high-concentration CO2 recycling treatment device, application and parboiled rice processing method

Abstract

The present invention relates to the field of food processing technology, specifically to a high-concentration CO2 cyclic processing device, comprising a CO2 storage tank, a first processing system, a second processing system and a recovery system; the CO2 storage tank is connected to the first processing system and the second processing system respectively, and the first processing system and the second processing system both include a processing kettle, a heating device and a cooling device; the recovery system includes a plurality of delivery pipes arranged in parallel, and the two ends of each delivery pipe are respectively connected to the processing kettles in the first processing system and the second processing system, and the delivery pipes include a normal pressure delivery pipe, a boosted delivery pipe and a delivery pipe provided with a vacuum generating device. The present invention can recycle more than 99% of CO2, save energy and reduce emissions, and has a short processing time, so as to realize fast and efficient processing of food materials. The present invention also relates to the application of the device in food processing, and also relates to a processing method of parboiled rice, which can significantly improve the processing efficiency and processing quality of parboiled rice.

Description

Technical Field

[0001] The invention relates to the technical field of grain processing, and in particular to a high-concentration CO2 circulatory treatment device, an application thereof and a parboiled rice processing method. Background Art

[0002] As my country's various industries transform towards a low-carbon and green direction, it is of great significance for the agricultural and food industry to establish a low-carbon management system and operate a new low-carbon management model, innovate food processing equipment and technology, and minimize the production and emissions of CO2 during food processing.

[0003] The main problems in current grain processing and storage are, on the one hand, that during the grain processing process, the high temperature and high concentration of oxygen in the air in an open air environment cause serious loss of heat-sensitive and oxidizable active substances in the grain. For example, "steamed rice" products are popular among consumers all over the world because of their high nutritional value, but during the steaming and cooking process, they suffer serious loss of unsaturated fatty acids, vitamins and active proteins. On the other hand, after the grain is dried, it is not resistant to storage and is very likely to breed grain pests and spoilage microorganisms, causing new losses in subsequent grain storage.

[0004] Using high-density carbon dioxide to treat food materials, especially fresh grain materials, under low temperature conditions can quickly and efficiently achieve the effects of sterilization, insecticide and passivation of lipoxygenase, thereby avoiding the negative impact of traditional thermal processing on food quality. Therefore, high-density carbon dioxide treatment technology has always been the focus of research and attention in various countries. However, the current high-density carbon dioxide treatment equipment and technology have major drawbacks in practical application, such as traditional supercritical carbon dioxide extraction devices, newly developed high-density carbon dioxide sterilizers (ZL200520132590.X), etc., which fail to involve the recovery and repeated use of CO2 after use, and do not consider the impact of CO2 generation and emission on the environment during food processing. Some existing studies use high-concentration carbon dioxide gas to treat red dates to kill insect eggs, but each treatment still loses nearly half of the CO2, and the effect time on red dates is long, taking about four days, and the treatment efficiency is low, which needs to be improved urgently.

[0005] Therefore, in order to improve my country's food security, the country is in urgent need of key technologies to solve the main problems in food processing and storage. The present invention aims to develop a high-concentration CO2 recyclable treatment device and application to better meet the actual needs in food processing and storage. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a high-concentration CO2 circulatory treatment device to improve the reuse rate of CO2 and reduce waste gas emissions during the treatment process.

[0007] The present invention further proposes the application of a high-concentration CO2 recyclable treatment device in grain processing, thereby achieving rapid and efficient treatment of grain materials such as sterilization, pest control, lipoxygenase inactivation and starch gelatinization, improving the reuse rate of CO2 during the treatment process, and reducing waste gas emissions during the treatment process.

[0008] The invention also provides a parboiled rice processing method to improve the parboiled rice processing efficiency and the quality of the parboiled rice.

[0009] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0010] A high concentration CO2 recycling treatment device,

[0011] It includes CO2 storage tank, first treatment system, second treatment system and recovery system;

[0012] The CO2 storage tank is connected to the first treatment system and the second treatment system respectively through an air intake pipe, and an air valve and a first pressurizing device are arranged on the air intake pipe. The first treatment system and the second treatment system both include a treatment kettle, a heating device and a cooling device. The treatment kettle is provided with a feed inlet and a discharge port, and a heat exchange interlayer is arranged on the outer wall of the treatment kettle, and the heat exchange interlayer is connected to the heating device and the cooling device through a pipeline;

[0013] The recovery system includes a plurality of delivery pipes arranged in parallel, the two ends of each delivery pipe are respectively connected to the treatment kettles in the first treatment system and the second treatment system, and a gas valve is arranged on each delivery pipe; at least one delivery pipe is a normal pressure delivery pipe, at least two delivery pipes are pressurized delivery pipes, a second pressurizing device is arranged on the pressurized delivery pipe, at least one delivery pipe is provided with a vacuum generating device, and the delivery pipe provided with the vacuum generating device is also connected to an exhaust pipe.

[0014] Furthermore, the pipeline and the delivery pipe are both provided with a gas filtering device.

[0015] Furthermore, a stirring device, a pressure detection device and a temperature detection device are provided in the processing kettle.

[0016] Furthermore, the heat exchange interlayer is a hollow cavity, the heating device is a high-temperature constant-temperature water tank, and the cooling device is a low-temperature cooling water tank.

[0017] The application of the high-concentration CO2 recyclable treatment device as described above in grain processing.

[0018] Furthermore, the grain is granular grain.

[0019] Furthermore, food processing includes a high concentration CO2 treatment step with circulation:

[0020] 1) Add the first batch of grain into the processing kettle of the first processing system, and turn on the vacuum generator after the feeding is completed. The vacuum generator exhausts the air in the processing kettle, and then the gas in the CO2 storage tank enters the processing kettle for processing, so that the pressure in the processing kettle is maintained at 7-70MPa, the temperature is maintained at 25-90°C, and the processing time is 15-100min;

[0021] 2) Add the second batch of grain into the processing kettle of the second processing system. After the feeding is completed, turn on the vacuum generator, which discharges the air in the processing kettle of the second processing system. The CO2 in the processing tank of the first processing system enters the processing kettle of the second processing system through the normal pressure conveying pipe. When the pressures in the two processing kettles are similar, turn on the second booster device to allow the remaining CO2 in the processing kettle of the first processing system to further enter the processing kettle of the second processing system for processing, so that the pressure in the processing kettle is maintained at 7-70MPa, the temperature is maintained at 25-90°C, and the processing time is 15-100min. When the pressure in the processing kettle of the second processing system is insufficient, the CO2 storage tank is used to supplement the gas;

[0022] 3) Cool the grain in the processing kettle of the first processing system, discharge it, and then aseptically package it;

[0023] 4) The third batch of grain is placed in the processing kettle of the first processing system. After the second batch of grain is processed, the CO2 in the processing kettle of the second processing system circulates into the processing kettle of the first processing system. After the CO2 in the processing kettle of the second processing system fully enters the processing kettle of the first processing system, the second batch of grain is cooled and discharged, aseptically packaged, and then recycled.

[0024] Furthermore, the amount of grain added in each step does not exceed one half of the volume of the processing kettle.

[0025] The present invention also relates to a method for processing parboiled rice, comprising a high-concentration CO2 treatment step: adding rice and water into a treatment kettle of a first treatment system or a second treatment system, turning on a vacuum generator after the feeding is completed, the vacuum generator exhausts the air in the treatment kettle, and then allows the gas in a CO2 storage tank to enter the treatment kettle for treatment, during which the pressure in the cavity of the treatment kettle is maintained at 7-70 MPa, the temperature is maintained at 25-90°C, the treatment time is 15-100 minutes, and after the treatment is completed, the rice is cooled to room temperature, dried and then aseptically packaged.

[0026] Furthermore, the mass ratio of rice to water is 2 to 4:1.

[0027] Beneficial effects: The high-concentration CO2 recyclable treatment device described in the present invention is cleverly designed. After each food material treatment, more than 99% of CO2 can be recovered, which saves energy and reduces emissions. The treatment time is short, and fast and efficient treatment of food materials can be achieved.

[0028] The application of the high-concentration CO2 recyclable treatment device in grain processing has a very good inactivation effect on rice lipoxygenase and lipase, and the insecticide rate reaches 100%, and the storage effect of the treated grain is significantly improved. At the same time, the CO2 killing and reuse rate is high in the treatment process of the present invention, and the waste gas emission is small.

[0029] The method for processing parboiled rice can significantly improve the processing efficiency of parboiled rice, the processing time is only 35% of the traditional processing time, and the broken rice rate is reduced, thereby further improving the nutritional quality and sensory quality of the parboiled rice, and retaining the active substances in the rice to the maximum extent. At the same time, the storage time of the rice as the raw material of the parboiled rice can be significantly prolonged, which is beneficial to the storage and preservation of the rice. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the high-concentration CO2 recyclable treatment device of the present invention.

[0031] Among them: 1. CO2 storage tank; 2. Gas filtering device; 3. First boosting device; 4. Pressure gauge; 5. Inlet pipe; 6. Air valve; 7. Second boosting device; 8. Normal pressure delivery pipe; 9. Vacuum generating device; 10. Exhaust pipe; 11. Processing kettle; 12. Heat exchange interlayer; 13. Stirring device; 14. Feed inlet; 15. Discharge outlet; 16. Heating device; 17. Cooling device; 18. Booster delivery pipe. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0033] Example 1

[0034] like Figure 1 As shown, the high-concentration CO2 recyclable treatment device includes a CO2 storage tank 1, a first treatment system, a second treatment system and a recovery system.

[0035] The CO2 storage tank 1 is connected to the first treatment system and the second treatment system through an air intake pipe 5. The air intake pipe 5 is provided with an air valve 6, a gas filter device 2 and a first booster device 3. The first booster device 3 is used to make the gas flow to the first treatment system or the second treatment system better. The first booster device 3 is preferably a gas booster pump. In addition, a barometer 4 is provided, and a branch pipe is provided on the air intake pipe 5. The branch pipe is also provided with an air valve 6, so as to facilitate the control of gas supply to the first treatment system or the second treatment system.

[0036] The first treatment system and the second treatment system both include a treatment kettle 11, a heating device 16 and a cooling device 17. The treatment kettle 11 is provided with a feed port 14 and a discharge port 15. The treatment kettle 11 is provided with a stirring device 13, a pressure detection device and a temperature detection device. The stirring device 13 is a stirring paddle connected to an external stirring motor. The pressure detection device includes a pressure sensor and a pressure gauge. The temperature detection device includes a temperature sensor and a temperature gauge, which can accurately monitor the temperature and pressure in the treatment kettle 11 in real time.

[0037] The outer wall of the treatment kettle 11 is provided with a heat exchange interlayer 12, and the heat exchange interlayer 12 is connected to the heating device 16 and the cooling device 17 through a pipeline. Specifically, the heat exchange interlayer 12 is heat exchanged by flowing water, the heating device 16 is a high-temperature constant temperature water tank, and the cooling device 17 is a low-temperature cooling water tank. The temperature in the reactor is adjusted by heat exchange of water.

[0038] The recovery system includes a plurality of delivery pipes arranged in parallel, and the two ends of each delivery pipe are respectively connected to the treatment kettle 11 in the first treatment system and the second treatment system, a gas valve 6 is arranged on each delivery pipe, and a gas filtering device 2 is arranged on both ends of the delivery pipe; at least one delivery pipe is a normal pressure delivery pipe 8, at least two delivery pipes are boosted delivery pipes 18, and a second boosting device 7 is arranged on the boosted delivery pipe 18, and the second boosting device 7 is preferably a gas boosting pump, and a vacuum generating device 9 is arranged on at least one delivery pipe, and the delivery pipe provided with the vacuum generating device 9 is also connected to the exhaust pipe 10.

[0039] In this embodiment, the recovery system includes four delivery pipes arranged in parallel, one of which is a normal pressure delivery pipe 8 and two are pressurized delivery pipes 18. One of the pressurized delivery pipes 18 can deliver the gas in the first processing system to the second processing system, and the other pressurized delivery pipe 18 can deliver the gas in the second processing system to the first processing system. In addition, a vacuum generating device 9 is provided on another pipeline for extracting the gas in the processing kettle 11 to facilitate the intake of gas in the processing kettle 11, further ensuring the purity of the gas in the processing kettle 11 and facilitating rapid intake of gas.

[0040] Example 2

[0041] The application of the high-concentration CO2 recyclable treatment device described in the present invention in grain processing is mainly used in the processing of granular grains, such as beans, barley, rice, etc.

[0042] The grain in this embodiment takes fresh rice as an example.

[0043] The processing includes circulating high concentration CO2 treatment steps:

[0044] 1) First, ensure that the containers and pipes in the first treatment system, the second treatment system, the recovery system, etc. that come into contact with the processed grain materials are clean and sterile. Arrange the first treatment system to process the grain materials, and the second treatment system is in a ready state.

[0045] Add the first batch of fresh rice into the processing kettle of the first processing system from the feed port, the fresh rice material does not exceed 1 / 2 of the total volume of the processing kettle cavity, close the material valve after the feeding is completed, open the stirring device, turn on the vacuum generating device, the vacuum generating device discharges the air in the processing kettle, wait until the pressure displayed on the pressure gauge is lower than -0.1MPa, close the vacuum generating device, slowly open the air valve on the air inlet pipe and the first boosting device, turn on the heating device at the same time, make the water in the heating device enter the heat exchange interlayer, keep the temperature in the processing kettle at 40°C, and the gas in the CO2 storage tank enters the processing kettle, keep the pressure in the processing kettle at 30MPa, and the processing time is 30min;

[0046] 2) Add the second batch of grain into the processing kettle of the second processing system. After the feeding is completed, turn on the vacuum generating device, which discharges the air in the processing kettle of the second processing system. When the pressure gauge in the processing kettle of the second processing system shows that the pressure is lower than -0.1MPa, open the gas valve to allow the CO2 in the processing tank of the first processing system to enter the processing kettle of the second processing system through the normal pressure delivery pipe. When the pressures in the two processing kettles are similar, close the gas valve on the normal pressure delivery pipe, open the gas valve on the booster delivery pipe and the second booster device to allow the remaining CO2 in the processing kettle of the first processing system to further enter the processing kettle of the second processing system, and turn on the heating device in the second processing system to maintain the pressure in the processing kettle at 30MPa and the temperature at 40°C. The processing time is 30min. When the pressure in the processing kettle of the second processing system is insufficient, the CO2 storage tank is used to supplement the gas, and stirring is maintained during the processing;

[0047] 3) After the CO2 gas in the first treatment system completely enters the second treatment system, the grain in the treatment kettle of the first treatment system is cooled to 25°C by a cooling device and then discharged and aseptically packaged;

[0048] 4) The third batch of grain is placed in the processing kettle of the first processing system. After the second batch of grain is processed, the CO2 in the processing kettle of the second processing system circulates into the processing kettle of the first processing system. When all the CO2 in the processing kettle of the second processing system enters the processing kettle of the first processing system, the second batch of grain is cooled by a cooling device and then discharged, aseptically packaged, and recycled.

[0049] The storage quality of the treated rice was compared with that of the traditional untreated rice, mainly testing the changes in the activity of lipoxygenase and lipase during storage, as well as the sensory changes in the quality, insecticide rate and color changes of the two rice during storage. The treatment effects between batches were not much different, and the test results of the last batch of treated rice were taken as an example, as shown in Table 1.

[0050] The results show that the present invention has a very good effect on the inactivation of rice lipoxygenase and lipase, indicating that it has a good effect of deactivating enzymes. The insecticidal rate of the present invention reaches 100%, and the insecticidal effect is remarkable. From the experimental results of its storage for 6 months, the rice treated by the present invention maintains good properties such as elasticity, viscosity, and aroma, and the color change is not large, while the taste of the untreated rice deteriorates, indicating that the present invention can significantly improve the storage quality of rice, ensure the insecticidal rate, and the processing time is short, efficient and fast, CO2 gas can be efficiently recycled during the processing process, the CO2 transfer rate in the processing kettle is more than 99%, and the energy-saving and emission-reduction effect is good.

[0051] Table 1 Comparison of storage quality between rice treated by the present invention and conventional untreated rice

[0052]

[0053] Example 3

[0054] The present embodiment provides a method for processing parboiled rice, including a high-concentration CO2 treatment step: firstly, ensuring that the first treatment system or the second treatment system, the recovery system and all containers and pipes in contact with the rice are clean and sterile;

[0055] Paddy rice and water are added into the treatment kettle of the first treatment system from the feed port at a mass ratio of 3:1. The total amount of paddy rice and water shall not exceed 1 / 2 of the total volume of the treatment kettle cavity. After the feeding is completed, the material valve is closed, the stirring device is opened, and the vacuum generating device is opened. The vacuum generating device will exhaust the air in the treatment kettle. When the pressure gauge shows that the pressure is lower than -0.1MPa, the vacuum generating device is closed, and the air valve and the first boosting device on the air inlet pipe are slowly opened. At the same time, the heating device is opened to allow the water in the heating device to enter the heat exchange interlayer to maintain the temperature in the treatment kettle at 65°C, and the gas in the CO2 storage tank enters the treatment kettle to maintain the pressure in the treatment kettle at 50MPa. The treatment time is 90min. After the treatment is completed, the cooling device is opened to reduce the temperature in the treatment kettle to room temperature, and the kettle is dried and then aseptically packaged.

[0056] The traditional processing method of parboiled rice is to soak the rice at 30-55℃ for 3-5 hours, then place it in a high-pressure steamer at 115-125℃ for 3-6 minutes and then dry it.

[0057] The parboiled rice processed by the present invention and the traditional process were compared, and the broken rice rate, soaking and cooking time, flavonoid content, hydroxyl radical scavenging rate in antioxidant activity and resistant starch content (beneficial starch) were specifically compared between the two processes, and the results are shown in Table 2. It can be seen that the present invention can significantly improve the processing efficiency of parboiled rice, the processing time is only 35% of the traditional processing time, and the broken rice rate is significantly reduced, and the nutrition and biological activity are significantly improved.

[0058] Table 2 Comparison of the quality of traditional parboiled rice and the quality of parboiled rice processed by the present invention

[0059]

[0060] Further explanation, the parboiled rice can also be circulated and treated by a high-concentration CO2 recyclable treatment device, and the effect of the parboiled rice treated in each batch is not much different, and the CO2 gas can be efficiently recycled during the treatment process, and the CO2 transfer rate in the treatment kettle is more than 99%, which has good energy-saving and emission reduction effects. The operation process is similar to that in Example 2, except that the raw materials include rice and water, and after the operation is completed, they need to be dried and aseptically packaged, which will not be described in detail here. The above shows and describes the basic principles, main features and advantages of the present invention. The technicians in this industry should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected. The scope of protection claimed in the present invention is defined by the attached claims and their equivalents.

Claims

1. Application of a high-concentration CO2 recycling treatment device in grain processing, characterized in that: The high-concentration CO2 recyclable treatment device includes a CO2 storage tank, a first treatment system, a second treatment system and a recovery system; The CO2 storage tank is connected to the first treatment system and the second treatment system respectively through an air intake pipe, and an air valve and a first pressurizing device are arranged on the air intake pipe. The first treatment system and the second treatment system both include a treatment kettle, a heating device and a cooling device. The treatment kettle is provided with a feed inlet and a discharge port, and a heat exchange interlayer is arranged on the outer wall of the treatment kettle, and the heat exchange interlayer is connected to the heating device and the cooling device through a pipeline; The recovery system comprises a plurality of delivery pipes arranged in parallel, the two ends of each delivery pipe are respectively connected to the treatment kettles in the first treatment system and the second treatment system, and a gas valve is arranged on each delivery pipe; at least one delivery pipe is a normal pressure delivery pipe, at least two delivery pipes are pressurized delivery pipes, a second pressurizing device is arranged on the pressurized delivery pipe, at least one delivery pipe is provided with a vacuum generating device, and the delivery pipe provided with the vacuum generating device is also connected to an exhaust pipe; The processing device comprises the following steps when applied to food processing: 1) Add the first batch of grain into the processing kettle of the first processing system. After the feeding is completed, turn on the vacuum generator, which will exhaust the air in the processing kettle. Then, the gas in the CO2 storage tank will enter the processing kettle of the first processing system for processing. The pressure in the processing kettle is maintained at 30-50MPa, the temperature is maintained at 40-65℃, and the processing time is 30-90min. 2) Add the second batch of grain into the processing kettle of the second processing system. After the feeding is completed, turn on the vacuum generator, which will exhaust the air in the processing kettle of the second processing system. The CO2 in the processing kettle of the first processing system will enter the processing kettle of the second processing system through the normal pressure conveying pipe. When the pressures in the two processing kettles are similar, turn on the second booster device to allow the remaining CO2 in the processing kettle of the first processing system to further enter the processing kettle of the second processing system for processing. The pressure in the processing kettle of the second processing system is maintained at 30-50MPa, the temperature is maintained at 40-65℃, and the processing time is 30-90min. When the pressure in the processing kettle of the second processing system is insufficient, the CO2 storage tank will be used to supplement the gas. 3) Cooling the grain in the processing kettle of the first processing system, discharging the grain and aseptically packaging it; 4) After the second batch of grain is processed, the third batch of grain is placed in the processing kettle of the first processing system. The CO2 in the processing kettle of the second processing system circulates into the processing kettle of the first processing system. When the third batch of grain is processed, the second batch of grain is cooled and discharged, aseptically packaged, and then recycled.

2. The use according to claim 1, characterized in that: The pipeline and the delivery pipe are both provided with gas filtering devices.

3. The use according to claim 1, characterized in that: The processing kettle is provided with a stirring device, a pressure detection device and a temperature detection device.

4. The use according to claim 1, characterized in that: The heat exchange interlayer is a hollow cavity, the heating device is a high-temperature constant-temperature water tank, and the cooling device is a low-temperature cooling water tank.

5. The use according to claim 1, characterized in that: The food is granular food.

6. The use according to claim 1, characterized in that: The amount of grain added in each step shall not exceed one half of the volume of the processing kettle.

7. A method for processing parboiled rice, characterized in that: The parboiled rice processing adopts a high-concentration CO2 recyclable treatment device, which includes a CO2 storage tank, a first treatment system, a second treatment system and a recovery system; The CO2 storage tank is connected to the first treatment system and the second treatment system respectively through an air intake pipe, and an air valve and a first pressurizing device are arranged on the air intake pipe. The first treatment system and the second treatment system both include a treatment kettle, a heating device and a cooling device. The treatment kettle is provided with a feed inlet and a discharge port, and a heat exchange interlayer is arranged on the outer wall of the treatment kettle, and the heat exchange interlayer is connected to the heating device and the cooling device through a pipeline; The recovery system comprises a plurality of delivery pipes arranged in parallel, the two ends of each delivery pipe are respectively connected to the treatment kettles in the first treatment system and the second treatment system, and a gas valve is arranged on each delivery pipe; at least one delivery pipe is a normal pressure delivery pipe, at least two delivery pipes are pressurized delivery pipes, a second pressurizing device is arranged on the pressurized delivery pipe, at least one delivery pipe is provided with a vacuum generating device, and the delivery pipe provided with the vacuum generating device is also connected to an exhaust pipe; The processing method of parboiled rice includes a high-concentration CO2 treatment step: adding rice and water into a processing kettle of a first processing system or a second processing system, turning on a vacuum generator after the feeding is completed, the vacuum generator exhausts the air in the processing kettle, and then allows the gas in the CO2 storage tank to enter the processing kettle for treatment. During the treatment, the pressure in the cavity of the processing kettle is maintained at 30~50MPa, the temperature is maintained at 40~65℃, the processing time is 30~90min, and after the treatment is completed, the rice is cooled to room temperature, dried and then aseptically packaged.

8. The method for processing parboiled rice according to claim 7, characterized in that: The mass ratio of rice to water is 2~4:1.

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