KELVION GERMANY GMBH

Heat recovery for energy-efficient waste gas cleaning

All Kelvion

1 A high heat recovery degree, that means an efficient transfer of the heat from cleaned gas to the raw gas keeps the operating costs for the reheater low

2 In waste gas cleaning with Kelvion-Rekugavo, the catalytic converter can be mounted on the heat exchanger, which reduces the footprint of the system (here: catalytic converter on the heat exchanger)

3 The heat exchanger packs with 760 mm depth and 1060 mm width are often positioned in rows of two next to each other in the containers

4 The plate corrugation optimizes the heat transfer to the raw gas

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 DeNO_x-systems, on the basis of a SCR catalytic converter...