Heat recovery for energy-efficient waste gas cleaning

The structure of many industrial and power plants was engineered decades ago and often offers only limited space for the installation of waste gas cleaning systems. Therefore, it is not usually possible to apply in-process methods that clean hot raw gas. The alternatives are waste gas cleaning systems at the cold end. These can be installed further away from the actual process, however, they require in most cases an increase in the waste gas temperature so that, for example, the chemical reaction can take its course in a catalytic converter. To generate the heat with a low energy input, Kelvion supplies the Rekugavo recuperative gas preheater.

A recuperative preheater is a gas-gas heat exchanger that extracts heat from a stream of hot waste gas and transfers it to the raw gas that is to be cleaned. During ongoing waste gas cleaning, the raw gas can be heated with the heat of the cleaned waste gas almost to the input temperature required for the catalytic converter. Burners or other systems for reheating therefore only have to effect a low temperature increase amounting to just a few Kelvin (Figure 1).

Recuperative gas preheaters are suitable both for denitrification in low-dust DeNOx-systems, on the basis of a SCR catalytic converter...

Related articles:

Issue 8/2023 CN116499260 (A)

Preheater system of cement clinker production line

(22) 21.04.2023 (43) 28.07.2023 (57) The invention discloses a cement clinker production line preheater system which comprises a plurality of stages of cyclones, connecting pipelines of the cyclones...

Issue 11/2013

Regenerative Thermal Oxidation (RTO) with integrated NOx reduction

1 Introduction Odor emissions had been a problem for the cement plant in Wopfing located in Piestingtal in Lower Austria close to Wiener Neustadt, Austria for several years, due to its location in a...

Issue 06/2013

Latest waste heat utilization trends in ­cement plants

The number of installed systems for generating electrical power from waste heat has increased worldwide from 525 in 2009 to 865 in 2012. The number of non-conventional processes has also risen...

Issue 02/2011

Turning waste heat into clean energy

ABB and Holcim Switzerland have agreed to install ABB’s newly developed heat recovery and electrical power production system at their cement plant in Untervaz/Switzerland (Fig. 1). ABB’s...

Issue 10/2020 CTP TEAM S.R.L.

WHR technology: new horizons and industrial applications

A modern cement kiln is already optimised to get the maximum thermal efficiency and keep specific consumptions under control; this target is reached reusing as much as possible in the process the high...