Used grain dryers use characteristics

Grain drying is a very complex process, many factors, dry conditions varied, which factors are medium parameters (such as temperature of hot air, hot air and hot air flow, humidity), food parameters (such as grain type, grain moisture, grain temperature and grain traffic), environmental conditions (such as atmospheric temperature and atmospheric humidity), drying processes (eg downstream drying, countercurrent drying, cross-flow drying, mixed dried structural parameters) and dryer. A grain dryer is possible (minus 20 ℃) ??work at very low ambient temperatures, it may operate at up to 30 ℃ ambient conditions, the working conditions are completely different, and even a far cry from two so necessary to the measured performance Indicators for conversion, converted into a unified recognized dry conditions. The standard of research to develop, the need for different environmental conditions, food condition, F [I atmospheric temperature, atmospheric relative humidity, the initial grain moisture, the end of the moisture, precipitation rate, food category, quality, heating, hot air temperature, relative humidity of hot air , amount of hot air, drying mode and a series of parameters a lot of experimental verification, to form a formal national standard difficult. The most likely way is to complete the study outcome, given the conversion coefficient is not entirely accurate, as the technical guidance document published trial, and then compare and evaluate. Therefore, the heat consumption of the dryer production capacity and conversion unit is a very important criterion. Unit Energy Consumption and drying capacity are key indicators of grain drying equipment. For a different type or the same type of grain drying equipment, when there is a difference in the working conditions of its acceptance, through the relevant conversion factor must be converted to a lower standard of working conditions, in order to carry out the determination unit heat consumption and drying capacity, Compare. At present, there is no uniform drying unit heat consumption and drying capacity conversion coefficient specification. This paper will study the conversion coefficient, study and develop a unified national standard conversion factor. Grain drying heat consumption and drying capacity has been a major problem plagued converted to grain dryer performance evaluation, appraisal; workload over the years due to lack of research and research funding, this issue has not been resolved. Heilongjiang Academy of Agricultural Reclamation proposed a solution, but because it is not applicable to a variety of drying techniques and models as well as standard conditions and model selected is not reasonable and not become the national standard. The author in-depth analysis and study of existing drying technology on the basis of research results, through experimental and theoretical analysis to determine the standard drying conditions commuted, given a variety of drying models and different conversion coefficients of grain drying The calculation method and conditions of use.