Abstract
Counterflow cooling is extensively used in many industries to recover the heat from hot materials coming out of kiln. The method for calculating a counterflow step-type bulk material cooler is proposed. It is based on a matrix model of heat balance for individual cooling stages. The proposed equation system allows calculating the required number of steps and airing flow rate. The method was used to design a cyclone heat exchanger for an alumina calcination furnace and a counterflow louvered proppant cooler. It allows taking into account the degree of heat transfer incompleteness at individual stages and minimizing air flow for cooling. Examples of industrial introduction are given. The applicability of the method for counterflow heaters calculating is noted. On the basis of the offered method, step counterflow coolers with louvers were developed and introduced. Such devices and calculation methods can be used to heat the material before being fed into the furnace. The use of step-type counterflow heat exchanger makes it possible to utilize the heat of bulk material leaving the furnace and the heat of exhaust gases.
Highlights
In many industries, the task of cooling or heating bulk material is important
This task is achieved through the installation of appropriate heat exchangers – heaters and coolers of bulk material
They suggested using the exhaust gas leaving from kiln system for drying the raw material
Summary
To obtain the maximum economic effect, it is advisable to use the heat of the exhaust gases and the thermal energy of the material leaving the furnace This task is achieved through the installation of appropriate heat exchangers – heaters and coolers of bulk material. Rasul et al [2] studied the thermal performance of a cement plant They suggested using the exhaust gas leaving from kiln system for drying the raw material. Their study allows predicting the temperatures of exhaust air and estimate of waste heat recovery from the clinker cooler system. Another example is the cyclone calcination furnace for alumina production [6].
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