Improving the Operation of a Scrubber to Purify Emission Gases with Increasing Efficiency Due to Heat Recycling

The article is dedicated to the current problem of increasing energy efficiency by recycling heat emitted during the condensation of spent gaseous steam-water mixtures in various thermal plants. Special attention is paid to the application of contact heat exchangers withdrawing heat and moisture from escaping hot gases to be recycled in the production flow. Industrial facilities and enterprises of production synthetic fiber in particular are significant sources of emissions of anhydride, binary compounds of sulfur and nitrogen, including their solid micro-particles. Such emissions negatively affect the atmosphere, climate, and human health. Various types of gas purifying equipment are considered: i.e., scrubbers, DESP systems, and various types of dust collectors (mechanical, fabric, granular, etc.). A model has been provided to calculate the parameters of a scrubber designed to purify and recycle the heat waste of emission gases from various devices used by chemical fiber production enterprises. The model is based on the cell approach and considers the processes of heat and mass exchange between gaseous and liquid phases. Mathematical dependences describing heat and mass transfer processes in the scrubber are also provided, including recurrent matrix equations to analyze the kinetics of such processes. The author presents the methodology of model parameter calculation, including the determination of temperature, pressure, and moisture content in various locations of the device. The proposed methodology helps to determine both transition processes and the stationary state in the scrubber in question. Notably, the obtained calculations demonstrate the high efficiency of the device operation. The suggested calculation methodology can be implemented in any software designed for operations with matrices, which makes it a useful tool for engineering calculations and the optimization of systems of heat waste purification and recycling at industrial enterprises. The article is of interest to experts in the field of thermal energy.