Solar Drying Technology And Its Application

Since the 21st century,China's modernization has entered a completely new stage of development.One of the contradictions facing the process of water resources disposal is very prominent.Sewage production has risen year after year,and sludge as a "by-product" of sewage treatment,the effective treatment rate is always at a low level,causing great harm to the ecological environment.The problem of high moisture content is the root cause of these problems.Sludge drying process requires a lot of energy consumption input,resulting in high operating costs,so that sewage treatment plant overwhelmed.Reducing the economic cost of sludge disposal becomes a top priority.Solar energy drying technology relies on solar energy,which meets the requirements of the new development concept.For sludge drying treatment,this paper analyzes the different regional characteristics of rural suburban areas and urban township centers,and puts forward two kinds of drying methods.One is developing the traditional solar greenhouse for the rural suburbs and another is developing a new type of solar energy fluidized bed for urban township centers.Solar greenhouse is characterized by its greenhouse effect,which has the value of low cost,small energy consumption and good effect of bacteria removal.Solar fluidized bed combined with high-temperature solar energy heat collection technology and fluidized bed high heat transfer area characteristics,with fast drying potential.The full text combines the computer simulation technology,uses the CFD software package FLUENT to model,separately carries on the discussion to the traditional solar energy greenhouse and the new solar energy fluidized bed.The former has a heat collection temperature of over 64? and has the ability to dry.The structural design of the vents and vents designed in the same side wall in the diagonal position,the lowest energy dissipation.Drying operations need to be combined with ventilation strategy.It is recommended that the wind speed be 3m/s,and the humidity should be controlled by the humidity cycle.The latter uses trough technology to collect temperatures above 227 ?,with the potential for rapid drying,starting at 80 ?.Outlet volume of fluidized bed blower system should be greater than 0.5m3/min.The optimal addition ratio of biomass and sludge that is best for drying is 1:2.The final integrated economic cost and drying efficiency established a new type of pilot-scale experimental drying system for solar fluidized bed,followed by heat collection and drying experiments.The result of the heat collection showed that the effective power per unit area of the trough collector was 0.49 kW on sunny days and 0.25 kW on cloudy days.The drying experiment showed that the sludge with 60%moisture content can be reduced to about 40%in 40 minutes,and the sludge can be reduced to 30%in 50%moisture content at the same time.Experiments have shown that the solar fluidized bed has the properties of rapid drying and has great potential for solving the problem of urban sludge accumulation.The full text finally carried on a preliminary exploration of the application of solar energy drying technology.The calculation and analysis of the application of solar energy for latex drying were carried out.