Reclaim Ash for Cash and Wealth from Waste .pdf
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Reclaim Ash for Cash and Wealth from Waste
The ash is a common residue in thermal energised industries like power generation stations and blast
furnaces of steel plants. Unlike in the past when the polluting ash was deemed as a waste, over the past
four decades, the ash is collected in a systematic manner and processed into the manufacture of bricks,
ceramics, tiles, mineral fibre, synthetic wood, domestic detergent or in reinforcement of the road
surfaces etc. The ash handling systems function in different ways. These are appropriately designed and
fabricated to perform for respective applications such as Bottom ash handling including overflow
Coarse ash also known as economiser ash handling
Fly ash handling
Air pre heater ash handling
Ash slurry disposal
Channel to the ash disposal area
Water recovery system from ash pond
On this score, ash handling system manufacturers in India have proved their expertise by executing
these systems like across the country and abroad too. The Technology Information, Forecasting and
Assessment Council (TIFAC) constituted by the Government of India’s Department of Science and
Technology had conducted a detailed study on Fly Ash Utilisation Programme (FAUP).
Fly ash is one of the residues generated in combustion, and comprises the fine particles that rise with
the chimney gases. Prior to the mass awareness on the adverse effects of ash particles in the air,
factories and power plants used to belch ceaseless smoke into the atmosphere. Stringent anti-pollution
rules resulted in regulating the fly ash. By and large, it is captured by electrostatic precipitators or other
particle filtration equipment.
Since the hydro sluicing removal system needed huge quantity of water and extensive storage area and
also the collected wet ash was of little use, pneumatic conveying systems are in vogue these days. They
function as per the pressure and vacuum techniques and collect both fly and bottom ash. Consequent to
designated agencies conducting periodical Energy Audit and Performance Evaluation of power plant
operations and maintenance in India, the ash-related problems in thermal stations have drastically come
down. One among such agencies, also undertakes Performance Guarantee Tests, Renovation and
Modernisation (R&M) and Life Extension of these plants. Results of these exercises have shown that
reduction in emission level of SPM below 50 mg/NM3 as per the Pollution Control Board’s prescribed
As for using a pneumatic vacuum conveying system, the fly ash from various hoppers is evacuated in
lean phases to an intermediate hopper or silo. Hydraulic exhausters or vacuum pump creates vacuum.
Studies have revealed that Indian coal has high ash content which also tends to be inconsistent. As such
the design of the handling system has to adequately cover anticipated variations and be capable of
handling odd situations. The system has to be environmentally friendly, energy efficient and also
reliable with least maintenance problems.
The FAUP has documented its findings with wide ranging information on the fly ash, both as a resource
material and raw material for numerous products and services. With infrastructure projects gaining top
priority, the reclaimed ash would be of immense help for brick cement plants, land and mine filling as
well as highway construction.
For more information please contact us:
:249-C, Udyog Vihar, Phase IV,Gurgaon (Haryana), 122016 India