The Abrasive Properties of Coal Power Plants Ash and Slag Materials

Abstract

Ash and slag materials (ASM), formed during the combustion of coal in thermal power plants, have abrasive properties, which are manifested during the operation of boiler units, ash collection, ash and slag removal. These properties must be considered to ensure durable trouble-free operation of thermal power plants. On the other hand, these properties can be used when planning measures for ash and slag material disposal. The results of experimental-industrial tests of ash and slag materials abrasive properties are presented in this paper. It was shown that, when cleaning metal surfaces of various shapes from old paint coatings, the consumption of crushed coal slag per 1 m2 of the surface being treated is on average 4.8 times less than the consumption of sand, the time of surface treatment with slag is on average 2.45 times less than with the use of sand in similar conditions. The empirical formulas to evaluate the technical and economic efficiency of using ash and slag materials as an abrasive in industrial applications are given.

The Coal Quality CICS that Increases the Wear Resistance of Heat Exchanger Tubes

“…It would be possible to abandon low-quality fuel in advance and switch to reserve fuel to prevent these risks from approaching, but the task is signi icantly complicated by the fact that it is impossible to be sure of the quality of the imported steam coal or to measure the change in abrasive damage of the heat exchanger surface during combustion to analyze the actual wear resistance [13,14]. Even if there was such an opportunity to learn in real-time about the damage to the heat exchange surface during the combustion of steam coal, TPPs are traditionally not equipped with a laboratory to study the quality of coal composition.…”

“…For further construction of the technological model, the schematic drawing of ash and slag removal from the principle of [8,14], Figure 3 is considered 1 -boiler furnace chamber; 2 -ash collector; 3 -bath with a scraper conveyor for continuous ash removal; 4ash flushing apparatus of the ash collector; 5 -slag crusher; 6 -flushing pump; 7 -ash channel; 8 -sluice nozzle; 9 -receiving hopper of slurry with metal catcher; 10 -baghouse pump; 11 -drainage pump; 12slurry pipelines; 13 -ash dump to investigate other places of ash accumulation during fuel combustion.…”

“…According to the technological procedure of ash removal [14], the ly ash from the ash collectors mixes with ash and slag that lows out of the furnace through the ash channel and, together with the process luid, creates ash and slag slurry, which goes to the ash disposal area through the slurry pipeline. It would be possible to measure the slurry low rate in the slurry pipeline and, when deducting the technical luid, to understand the ash low, its relation to the fuel low, and the difference between the actual and the declared ash content.…”

Study and comparison of wear behaviour of Ni-Al2O3 coatings deposited by hot and cold spray

“…The erosive and abrasive wear can also lead to serious breakdowns and material failures apart from corrosion degradation [4][5][6]. The protective coatings of cermet due to their high-temperature structural rigidity and resistance to wear are preferred [7][8][9]. These coatings are made of hard ceramics blended with metallic spray powders.…”