I. Introduction
In the early 50's, China imported food series dryers and drying towers (rooms) from the former Soviet Union and carried out the domestic design and manufacture of drying towers. Although there are many forms, the basic structures are basically the same and all adopt high-temperature strong winds. Drying and drying process: grain drying for downstream, countercurrent, and combined hot air. The entire drying process is at atmospheric pressure. There is a large volume of drying equipment, low utilization of thermal energy, high power consumption, and waste heat is not used. , Poor quality after drying, long drying time; drying temperature is not easy to control, corn broken and cracked after drying, resulting in increased loss of circulation and other issues.
The drying of grain is not an independent process. Dehydration and drying are not purposes. The purpose is to regulate the quality and quality of corn. The cis-reverse circulating-flow low-temperature corn drying tower can achieve the three goals of quality, energy saving and environmental protection, and can be low for many corns. Cost, high-quality drying provides a brand-new solution and has a strong market competitiveness. Implementing a resource-saving and environment-friendly green drying strategy is a long-term adherence to the development of drying technology at home and abroad. It is particularly important in China. Practical significance.
II. Research and Development of "Yuanhong Drying" CWC Low-temperature Corn Drying Tower
Science and technology have changed the world, and innovation has made achievements in the industry. The greatest advantage of “Farron Drying†has been the integration of resources for drying equipment and improved cohesiveness of the R&D team. We have adopted a mode of authorized use and formed a win-win community of interests. In the design process, the effects of various factors such as production capacity, stability, reliability, adaptability, drying economy, continuity, etc. of the circulatory reverse flow low temperature corn drying tower are affected. The optimized design of the circulating-flow low-temperature corn drying tower and the supporting equipment, on the other hand, optimization of the drying process parameters, both of which can not be taken lightly.
Third, the system composition of the circulatory reverse flow low temperature corn drying tower
“Yuanhong Drying†overcomes the shortcomings of the hot-air drying towers on the market, and has developed, designed, and filed more than 40 national invention patents for the equipment supporting the CWC low-temperature corn drying tower, and has patent 2013204717194. , 2014204146756, 201320620005.5 and so on; patent applications No., 2013103352065, 2014103301068, 2014103467237 and other patents. The patent layout of the cis-reverse circulating-flow low-temperature corn drying tower is now preliminarily completed, and the equipment has been subjected to sample tests.
FIG. 1 is an appearance diagram of a cis-reverse circulating-flow low-temperature corn drying tower; FIG. 2 is a sectional view of a cis-reverse circulating-flow low-temperature corn drying tower;
The white device in FIG. 2 is a patented product circulating flow ventilation exhaust device and a continuous flow reverse ventilation device; the red device is a patented product vacuum heat exchange heat dissipation device; and the green device is a patented product condensation heat dissipation device.
The cis-reverse circulating-flow low-temperature corn drying tower adopts an overall assembly structure, adopts modular design and standardized production, and is easy to transport and install on site. The cooling tower, the drying bin, and the preheating bin are fixedly connected by a bracket from the bottom to the top, and the heat exchanger is further connected to different heat exchanging and cooling devices of the hot air drying tower; the condensing and heat-dissipating device is added and the drying is increased. Drying in the Drying Tower The moisture in the evaporated hot air is condensed into water and gas by the condensing heat-dissipating device. The heat energy released in the hot air after the moisture condenses can be reused for many times; the assembled circulating flow ventilation exhaust device and the smooth The countercurrent circulation ventilation device, the cycled hot air cycle, heats and convections the corn convection, allowing the thermal energy in the hot air to be reused 3-20 times.
Fourth, the cis-reverse circulation flow drying process of low temperature corn drying tower
1. The heat energy is transferred to the cooling warehouse, drying warehouse, and preheating warehouse of the low-temperature corn drying tower through the heat conduction pipe, and the corn and hot air are directly heated, thermally and heat-dissipated through the heat-exchanging and heat-dissipating device in the tower of the drying tower. The corn and gas are heated so that the temperature of the corn and the gas inside the drying chamber and the preheating chamber reach the required drying temperature.
2. After the corn to be dried is delivered to the feed inlet, the discharge valve enters the preheating position through the operation of the discharge valve; the corn enters the drying position after exhausting, preheating, heating, and ventilating the air in the preheating position.
3, corn in the drying warehouse through the ventilation, heat conduction, heating, drying into the cooling warehouse; corn in the cooling chamber through the pumping, heat exchange, cooling through the discharge valve discharge cooling warehouse, so complete the material circulation flow hot air Dry work.
4. The hot wind moisture generated by heating and drying in the drying chamber is condensed into liquid water through the condensing heat-dissipating device, and the heat energy released by condensation can be used multiple times.
5. The heat energy of the dried corn itself in the cooling chamber is cooled by the gas, and the gas is also warmed to hot air. The corn temperature in the cooling chamber is also cooled and cooled. After the hot air is further heated by the heat exchange heat sink, it enters the drying warehouse to heat and dry the corn.
Fifth, the main technical parameters of the reciprocating circulating flow low temperature corn drying tower
Processing capacity (corn): 100-1000t/d;
Precipitation amplitude: 5% to 20%;
Drying unevenness: ≤ 1%;
Unit heat consumption: <3800kJ/kg·H2O;
Out of tower corn crack increase rate: ≤ 3%;
Outbreak of maize shredding increase rate: ≤ 1%;
The color and odor of corn are normal and there are no coke grains and popcorn grains.
Six, performance comparison economic analysis
1, performance comparison
Table 1 Comparison of the product performance of the cis-reverse circulating-flow low-temperature corn drying tower and the hot-air drying tower
work   Process category
Shun Shun reverse circulation drying
Hot and dry air drying
  excellent  point
change   Heat Exchange System
Tower heat transfer heat transfer
tower  External heat transfer heat transfer
 High heat transfer rate
Hot air temperature ( °C )
40-50
8 0-160
 Hot air temperature is low
 Gasification temperature ( °C )
35 — 43
55—1 0 0
 Low-temperature drying
 Precipitation amplitude ( % )
3-28
3-20
   High drying efficiency
 Waste heat utilization ( % )
50 — 7 5
0
   Energy conservation
Electricity Motor energy consumption ( KW )
30-50
120—220
   Saving electricity
heat  Hot air usage
3 — 20 times
One-time use
Heat energy reuse many times
2. Economic Analysis
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 required electricity, coal and labor costs per ton for hot air drying of grain operations are between RMB 40-80.
The unit circulation heat flow drying corn drying tower drying unit heat consumption 3800-3200kJ/kg H2O; daily processing capacity 30-1000 tons, including its ancillary facilities such as: foundation treatment, boiler, warehouse, food transport Such facilities; drying tower internal heating, change the hot air boiler to an ordinary boiler, boiler investment reduced by half; you can also remove the hot air blower, hot air cylinder construction investment. Its sales price can also be located in the range of 30,000 to 3 million yuan, and profits have increased a lot. Drying grain operation costs per ton for electricity, coal, labor and other expenses in the 18-38 yuan.
Calculate the daily processing of 300 tons of corn:
(1) Direct benefits: Saving 15-30 yuan per ton of operating costs, 5,000 yuan per day; 150,000 yuan a 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 can feed, but also can be used for processing starch, food, etc.; can sell 20-60 yuan per ton, every day is 1 Million yuan; 300,000 yuan a month; a drying season can earn 1.2 million yuan more in four months!
Seven, series product development, application
According to the patented technology, it can extend the product chain, introduce multi-variety, multi-standard drying equipment, and expand and add multi-faceted profit growth points:
Low temperature drying equipment for vegetables; Low-temperature drying tower for rice;
Low-temperature drying equipment for mineral products; Low-temperature drying equipment for chemical products;
Chinese medicine low temperature drying equipment; food low temperature drying equipment;
Low-temperature drying equipment for feeds; Low-temperature drying equipment for pharmaceutical products;
VIII. Benefit Prospects
“Cyclic Circulation-flow Cylindrical Low-temperature Corn Drying Tower†overcomes the shortcomings of existing hot-air drying towers for drying and optimizes equipment and process flow. Compared with hot-air drying towers, it not only saves energy and reduces labor costs. , And the economy is considerable, a drying season can save 6-10 million yuan, it is worth promoting.
"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. The “Cyclic Circulation Cooled Low-temperature Corn Drying Tower†has been applied, identified, and filed by the Provincial Agricultural Bureau, and strived to enter the “National Catalogue for Supporting and Promoting Agricultural Machinery Products†so that consumers can enjoy the national agricultural machinery subsidy policy; they will strive to become a “successful circulation flowâ€. "High-temperature corn drying tower" high-tech enterprises, for agriculture, agricultural machinery, science and technology enterprises special funds, patent transformation policy support.
IX. Cooperative development
The products of the circulatory reverse-flow low-temperature corn drying tower are a blank both at home and abroad. The team members of the project development team of the “Reverse Cycling and Flow Cylindrical Corn Drying Tower†are domestic experts or senior engineers. Or first-line technicians; to create low-temperature and dry, improve product quality, save energy, protect the environment is a green action.
For the demonstration of feasibility and further information of the cis-reverse circulating-flow low-temperature corn drying tower, you can ask the drying experts, manufacturers and users to interview, communicate and discuss together.
Cooperation methods: 1. Technology license shares 3-50%;
2, buy out the use of patented technology;
3. Other modes of cooperation and win-win, negotiation and negotiation.
Luoyang Yuanhong Vacuum Drying Equipment Research Institute
Contact: Cheng Changqing
Phone: 13608655650
E-mail @qq.com
Address: No. 10 Mudan Road, Longxi District, Luoyang City
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