China Drying Network China is a large grain country. After harvesting, the grain moisture is high, and the food lost every year due to mildew is as high as several tens of billions of kilograms. In recent years, the use of grain hot air dryers has greatly increased the proportion of dried foods, effectively prevented the mildew of foods, and ensured a good harvest of grain; however, hot air convective drying equipment is a traditional drying equipment in industrial and agricultural production. The problems of high temperature, low utilization of heat energy, long drying time, etc., and crushing and bursting of the grain after drying of the grain are serious, resulting in an increase in losses in circulation.
In the vacuum state, the boiling point of the moisture of the material is reduced and the vaporization process is accelerated. In the process of vaporization of corn moisture, the boiling evaporation temperature is directly proportional to the ambient pressure. The high moisture corn is placed in a closed drying cylinder, and the vacuum drum is used to make the drying cylinder form and maintain a certain degree of vacuum while the drying cylinder is inside. Continuous heating of the corn causes the water inside the corn to spread to the surface through the pressure difference. After being vaporized, it is pumped away by the vacuum pump to achieve continuous dehydration and drying of the high moisture maize under the condition of vacuum and low temperature. Vacuum drying causes the boiling evaporation temperature of the water to decrease from 100°C to about 40°C. Since the evaporation temperature is lower than the gelatinization temperature of the starch, it will not cause damage to the corn kernels; it will reduce the cracking rate and breakage rate of the corn and avoid the high temperature. The destruction of nutrients and vitamins ensures the color, aroma, taste, shape and nutrient content of the material quality, and at the same time it improves the drying speed and can also easily recover useful and harmful substances. In the sense of environmental protection, it is said to be vacuum. Dry to "green dry".
Now many domestic institutes, manufacturers, and companies have been conducting continuous vacuum drying for several years or even more than ten years of research and development. So far, none of them has converted continuous vacuum drying technology into product marketing; this may prove their The drying technology adopted is not perfect, and the selected supporting vacuum equipment is not suitable for vacuum drying.
Science and technology change the world, innovation and achievements in the industry; business yesterday is to win in learning, wins in change; in the rapid development of the Internet of information exchange, knowledge sharing, "Fenghong vacuum drying" biggest advantage is the integration of vacuum drying equipment resources to improve the R & D team cohesion; "Tohiro vacuum dry" vacuum dried to build the country's R & D resource integration platform at one end attached to the user's needs, and the other end connected to hundreds of well-known universities in the country, 1 million each line experts and scholars; Hong vacuum food The research and development team of the low-temperature drying tower project is the human resources department of “Farroy Vacuum Dryingâ€. We adopt the mode of authorized use and commissioned development to form a win-win benefit community.
“Fenghong Vacuum Drying†consulted Xu Chenghai and Zhang Shiwei of “Vacuum and Cryogenics Laboratory†of Northeastern University; Zhao Xiangtao of Zhengzhou Scientific Research Design Institute of the National Grain Reserve Bureau and many other dozens of vacuum drying expert papers. Experts in various directions. The National Institute of Grain Reserves Zhengzhou Scientific Research and Design Institute has conducted research on domestic production of more than a dozen sets of continuous vacuum low-temperature northeastern corn drying technology equipment for manufacturing and production tests conducted from November 2003 to May 2008. Home vacuum drying test implementation cases, draw lessons from the dozens of domestic and foreign manufacturers of different drying process.
The development of continuous vacuum drying technology is inevitably based on the main design methods of adaptability and gradual improvement of the current design process; the design of the vacuum drying tower for the production capacity, stability, reliability, adaptability, drying economy, Continuity and other factors affect the intuitive and clear comprehensive evaluation value, and choose the right solution for the vacuum drying tower design and matching. The main process parameters of the continuous vacuum low temperature corn drying tower include vacuum degree, vaporization temperature, heating temperature, drying rate, drying strength, precipitation amplitude, non-uniformity, on-line moisture measurement and control and energy consumption. In order to ensure these properties, on the one hand optimization design on the vacuum drying tower and supporting equipment, on the other hand optimize the drying process parameters, both can not be taken lightly on either side. According to the thermal stability and breaking sensitivity characteristics of corn, taking into account that corn allowable temperature does not exceed 43 °C (below starch gelatinization temperature), design should increase the effective volume of the vacuum drying chamber to ensure that the material in the drying tower can be pre Heat, continuous feed and discharge requirements and even grain requirements.
"Yuanhong Vacuum Drying" overcomes the shortcomings of the existing continuous vacuum vacuum drying, developed a "continuous vacuum low temperature corn drying tower" (patent application number, 2013204363842, 2013103352065, 2013204717194); vacuum low temperature continuous drying tower used The overall assembly structure adopts modular design and standardized production, which is easy to transport and install on site.
"Continuous low-temperature vacuum corn drying tower" drying process is: first of all to start working heat boiler means, means for generating thermal energy via the heat pipe is connected to a vacuum tower corn drying column vacuum thermal cooling means, the heat exchanger heat vacuo In the device , the internal temperature of the drying tower reaches the required temperature; the food to be dried is passed through the vacuum discharge valve inlet, and then transferred to the preheating chamber, drying chamber, cooling chamber , heat energy and wet food. The heat and moisture exchange is performed. The moisture in the grain particles is discharged by the vacuum exhaust fan through the vacuum exhaust system . The moisture is condensed by the vacuum condenser and then discharged by the vacuum unit . The grain is preheated, dried, slowed, dried and slowed. Drying, slowing Su and cooling to complete the drying process, after reaching the required moisture content, exit the drying tower after the discharge port; effectively improve the vacuum thermal conductivity and heat efficiency, save energy, shorten drying time, reduce processing costs, low temperature drying Dry guarantees that the plant's activity in food is not broken.
1. The conveyor cleaning system mainly consists of a conveyor belt conveyor, a bucket elevator, a cylinder cleaning screen, a magnetic separator, an inlet and outlet device, and a slide pipe. The entire logistics process is to remove large amounts of impurities, dust, powder, dust, cotton and hemp preparations, and ferromagnetic materials in the food, and avoid drying unevenly.
2. The control system consists of control cabinets, control instruments, measuring instruments, regulating instruments, security alarm devices, PLC programmable controllers, touch screen displays, on-line moisture sensors, temperature sensors, and various switch circuits to effectively monitor and control drying. The operation of the process and the guarantee of product quality.
3. The vacuum drying system consists of a vacuum preheating chamber, a vacuum drying chamber, a vacuum cooling chamber, a vacuum discharge valve, a vacuum exhaust device, a vacuum unit, a vacuum condenser, a pipeline, a vacuum gauge, etc., due to the material temperature in the vacuum drying tower. The controllability and consistency are not affected by the temperature of the heating medium and are only determined by the degree of vacuum. The overall requirements for the ability to extract gas and pressure stability are good. In order to reduce the vaporization evaporation temperature, the vacuum degree of the system is mainly achieved.
4. The on- line moisture testing and grain-feeding automation technology being researched and developed, because wet grain and moisture grains have different moisture content and require different drying time. Therefore, after the design food reaches a certain amount of drying moisture, it can automatically control the grain rations. Reduce energy consumption and improve grain drying quality.
"Continuous vacuum low temperature corn drying tower" main technical parameters
Processing capacity (corn): 300-1000t/d;
Precipitation amplitude: 5%~20%;
Drying unevenness: ≤ 1%;
Unit heat consumption: <3800kJ/kg·H2O;
Out of tower corn crack increase rate: ≤ 5%;
The breaking rate of corn broken out in the tower: ≤ 1%;
The color and odor of corn are normal and there are no coke grains and popcorn grains.
The grain drying towers on the market now have different specifications. The heat drying unit for corn drying towers consumes 7500-5800 kJ/kg.H2O of heat; the daily processing volume ranges from 30 to 1,000 tons, including its ancillary facilities such as: foundation treatment, The price of boilers, warehouses, and grain transportation facilities is priced between RMB 3,000 and RMB 3 million. The cost of hot air drying of grain operating costs for each ton of electricity, coal and labor costs is RMB 40-60.
"Continuous vacuum low temperature corn drying tower" drying units of food heat consumption 3500-2800kJ/kg.
H2O; operating costs per ton of electricity, coal, labor costs and other costs in 25-35 yuan; daily processing volume of 30-1000 tons, including its ancillary facilities such as: foundation treatment, boilers, warehouses, food transportation and other facilities, Its price can also be located in the 35-380 million yuan, dry food operations per ton of electricity, coal, labor and other costs in the 18-38 yuan.
Continuous vacuum low temperature corn drying tower and hot air drying tower product performance comparison:
Process Category Vacuum Drying Hot Air Drying
Heated media superconducting heat sink
Heating temperature °C80-90120-160
Gasification temperature °C38-4355-100
Precipitation amplitude %3-183-18
Heat utilization %45-650
Motor energy consumption KW40—80120—220
Calculate the daily processing of 300 tons of corn:
1. Direct benefits: Saving operating costs of 15-20 yuan per ton, 5,000 yuan per day; 150,000 yuan per month; a drying season can save 600,000 yuan in four months!
2, indirect benefits: good quality of low temperature and dry corn, a variety of nutrients are preserved, so not only do feed, you can also do starch, food processing, etc.; can sell 20-50 yuan per ton, every day is 10,000 Yuan; 300,000 yuan a month; a drying season can earn 1.2 million yuan more in four months!
Continuous vacuum low temperature corn drying tower production management:
1. Formulate the production enterprise standard of “continuous vacuum low-temperature corn drying tower†product, standardize the production of the product, and verify the ex-factory price of the product.
2. According to the pressure design requirements, the vacuum tank of the vacuum grain drying tower is welded with a steel plate of 10-12 mm. The reinforcement ribs can be added outside the tower to improve the resistance to pressure; the vacuum tower body, vacuum heat-dissipation and heat dissipation device, vacuum exhaust system, Can have their own procurement of steel, processing, welding production; or modular order production.
3. Vacuum exhaust fans, boilers, vacuum units, heat pipes, thermal fluids, and vacuum discharge valves shall be responsible for production and procurement in the form of external packaging by the contractor; in accordance with the production characteristics of the products and the need to reduce production costs and investment risks, The production process will be designed on a just-in-time basis.
4, do a good job in the design of the vacuum drying tower: according to the length of the drying time of different materials, the development of the height of the drying tower, the size of 50-1000 tons of products processed daily.
"The "12th Five-Year Plan" high-end equipment manufacturing industry development plan" "high-efficiency, energy saving, green, environmental protection" and "localization of large-scale drying equipment," the specific requirements of the state to increase macro-control and market regulation mechanism, fully integrated drying companies Enhance the market competitiveness of enterprises.
1. To strive to become a “continuous vacuum low-temperature corn drying tower†high-tech enterprise, strive for the special funds for agricultural, agricultural machinery, and technology companies, and policy support for patent transformation.
2. “Continuous Vacuum Low-temperature Corn Drying Tower†must be applied, identified, and filed by the Provincial Agricultural Machinery Bureau; strive to enter the “National Catalogue of Support and Promotion of Agricultural Machinery Products†so that consumers can enjoy the national agricultural machinery subsidies policy;
The vacuum supporting equipment developed by “Continuous Vacuum Low Temperature Corn Drying Tower†has been tested in small samples and can achieve the desired results.
This patented technology can also develop the following products:
Corn vacuum low-temperature drying tower vegetable vacuum low-temperature drying equipment
Rice vacuum low temperature drying tower mineral vacuum low temperature drying equipment
Feed vacuum cryogenic drying equipment Medical vacuum cryogenic drying equipment
Chinese medicine vacuum low temperature drying equipment wood vacuum low temperature drying equipment
Food vacuum low temperature drying equipment Chemical vacuum low temperature drying equipment
Now we are looking for powerful partners across the country to carry out technological transformation and expand the market .
cooperation method:
1. Technology license shares, 10-30%;
2, buy out the right to use the patented technology;
3. Other modes of cooperation and win-win can negotiate and negotiate.
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