Chemical and Process Engineering
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A S Jessup-Bould: Energy from Waste (Incineration) Experience
Project Background					End Client: Newlincs Development, Stallinborough, Grimsby
This municipal waste incineration facility using Cyclerval technology was project managed by Earth Tech Engineering Limited.
Process Description
Municipal waste is received from waste collection vehicle and transferred in to a rocking combustion cell at an average rate of 7tph. Waste heat is recovered by a combined heat and power system. Electricity and hot water are sold to an adjacent works. Alternatively, when the works power demand is low, power can be sold to the grid. An air cooled steam condenser provides for periods when the alternator is out of service, thus allowing waste processing to continue. Flue gas leaving the boiler is cleaned by dry scrubbing with PAC/Lime and a bag filter. Ash and clinker are removed from the combustion cell through a water quench. Ferrous metals separation is provided prior to storage in bunkers. Boiler ash and spent PAC/Lime are collected and stored in a waste solids silo.
Responsibilities
At the start of 2001 I accepted an invitation from the water engineering contractor Earth Tech to join their staff as a Senior Process Engineer, working on their first and potential future Energy from Waste contracts. The company had offered me the position on the basis of my experience in energy from sludge incineration projects. Their first contract was mainly mechanical engineering focused, based on a Cyclerval incinerator design which meant that the project was given a limited defined scope of in-house Process Engineering work. This meant that major component packages were not submitted to a Process Engineer for techno-economic evaluation and to ensure they could be integrated to form coherent overall process.
The process engineering tasks that I did carry out were:
· Process flow diagrams. · Comprehensive heat and mass balances. · Process hazard statement. · Hazardous area classification. · Functional design specification review.
Unit Operations Cranes. Combustion. Fans. Steam raising system. Cooling Pond. Power generation. (Steam / diesel driven). Bag filtration. Dry flue gas scrubbing. Air cooled condensation & heat exchange. Solids quenching, cooling & mechanical conveying.				Hazards Combustible solids (waste, activated carbon). Fuels (natural gas, gas oil). Gases arising from process (CH4, CO). Corrosive reagents (Conc HCl & NaOH). Dusts containing heavy metals. Hot surfaces and materials. High voltage switch gear. Heavy rotating machinery. Noise. Confined spaces. Standards etc. Institution of Gas Engineers; GM6, SR25, UP10. Institute of Petroleum; IP15.