Determination of dependencies of dehydration of thermal power plants’ ash and slag waste from equipment parameters

Valentyna Cholyshkina,Serhii Kostyria,A Bulat,O Voloshyn,B Liu,V Heyets,Y Kryzhanivskyi

doi:10.1051/e3sconf/201910900015

Abstract

Complex processing of ash and slag from coal-fired thermal power plants attracts a lot of attention. Waste processing will reduce the load on existing storage facilities, to return unburned coal to the boilers of power plants, to obtain a valuable raw material resource for construction, ferrous and non-ferrous metallurgy. At all thermal power plants of Ukraine utilization and storage of ash and slag is carried out by hydraulic method. Therefore, for all processing technologies relevant the dehydration of fine-disperse raw material. The article presents the results of laboratory tests of a new device for dehydration of ash and slag waste. It uses a set of influences on raw material: the overlay of vibration oscillations, the electric field and vacuumizing. By the method of pair linear correlations it is obtained that the dependence of moisture on each of the variable parameters has a weak nonlinear character. The exact and approximate multiple regression equations for the practical assessment of moisture under the combined action of all variable factors are obtained. With the size of the raw material + 0.63 – 0.05 mm, it allows to reduce the moisture from 30 to 9 %.

Highlights

In the modern world, the process of electricity production at thermal power plants (TPP) is carried out by burning fine coal, while a huge amount of ash and slag is formed
Processing of ash and slag waste from thermal power plants is constrained by the need for dehydration of microfine products of ash storage facilities
The analysis of the experiments showed that the partial pair correlations of moisture with any of the device parameters are of a weak nonlinear character

Summary

Introduction

The process of electricity production at thermal power plants (TPP) is carried out by burning fine coal, while a huge amount of ash and slag is formed. The most relevant is work on the creation of a comprehensive waste-free technology for the extraction of silicate fraction, metal (in the form of iron splices) and unburned coal Each of these products has industrial interest. One of the reasons for the profitability of the technology for the extraction of waste components-coal, metal fraction and silicate part, is that all components are finely dispersed This eliminates the expensive operations of additional grinding of raw materials in preparation for magnetic or electrical separation and is convenient for the direct use of coal and silicates. This article describes the results of the tests of this device in the dehydration of wastes Novo-Kramatorsk thermal power plant (Table 1, 2) and theoretical analysis of experimental data

Experimental studies

Theoretical studies

Findings

Summary