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Halting harmful flue gases - Part 2

Published by
World Cement,

This is part two of a two-part article written by Viv Williamson, FPE Global, for World Cement’s BMHR supplement issue. Subscribers can read more high-quality articles by signing in, and can also catch upon-the-go via our new app for Apple and Android.

To read part one click here

Case study

FPE Global has recently completed and installed permanent lime injection systems for Hanson Cement, part of the Heidelberg Group.

The Hanson cement plant at Ketton, Rutland in the UK is pioneering the concept of sustainable cement production with an increasing use of non-fossil fuels for heating the kilns. The range of combustible products that engineers are using to replace coal includes various alternative fuels that would otherwise end up as landfill. As a result, the company’s carbon footprint is dropping year on year.

FPE Global supplied a suitable lime injection system that included a 40 t capacity mild steel silo to provide the bulk storage of lime on site. To allow for the safe filling of the silo by road tankers, the silo was fitted with a filter/venting unit and pressure relief valve in line with the latest HSE guidelines in the UK. There is also a silo auto shut-off mechanism designed to protect both the environment and the silo from being over pressurised or over filled. Compression type load-cells are fitted to the silo to continuously monitor and measure the inventory within the silo. To assist in product discharge and eliminate bridging at the silo outlet, a rotating mechanical discharger has been fitted to the base of the silo.

As with any pneumatically conveyed delivery system, when handling hydrated lime, a great deal of care is needed at the planning stage to ensure that the system operates as reliably as possible. A possible problem can be caused when hydrated lime enters the pneumatic conveying air stream. If the lime calcines, it will adhere to the surface that the moisture condenses upon. This chemical reaction is unavoidable. However, using its pneumatic conveying experience, FPE Global designed a conveying system that performed to the best of its ability and operated with minimal maintenance. The company supplied a turnkey project to Hanson including the civils, design, project management, supply, manufacture, delivery and installation.

Edited for web by Joseph Green

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