On application of the cycle mode of connecting heat batteries in heat supply systems

Abstract

The use of batteries in autonomous heating systems is a well-known method of equalizing heat loads, saving raw materials and energy resources. As a primary source of energy in such systems, they successfully use the heat of steam extracted from intermittently operating utilization plants, mainly converter gas coolers during the purging of the converter bath for steam accumulation using Roots batteries. At current rates and ranges of temperature change at the end of charging and discharging during operation of these systems, fatigue phenomena are possible in the metal case of the battery from the existing deep “jumps” of temperatures with the formation of thermal stresses (overcooling) of its case, which causes a number of technical problems. To prevent this phenomenon, it is proposed to extract thermal energy from several such mass and heat exchangers when they are alternately connected to the evaporation circuit of the consumer. This method of selection of heat allows not only to avoid overcooling of the battery case, but also to improve the performance of the process. Based on the analysis of the formalized equation of the heat supply dynamics to the consumer when the corresponding coolant is heated, it is concluded that the efficiency of the pulsed mode of connecting batteries is effective. The temperature of the coolant varies exponentially. When implementing the proposed method, the heating of the next portion of the coolant is carried out under the conditions of the greatest temperature difference, which makes it possible to markedly intensify the process. It is proved that the efficiency of the pulse mode is possible if there are already two or more batteries. It has been established that the duration of connecting each battery in a pulsed mode should not reach the duration of the transient heating of the coolant with the traditional method of heat extraction.