Energy efficiency in steam and condensate savings

Panel: 4. Undertaking high impact actions: The role of technology and systems optimisation

This is a peer-reviewed paper.

Authors:
Lauri Suomalainen, Motiva Oy, Finland
Hille Hyytiä, Motiva Oy, Finland

Abstract

Our company has long experience in the field of improving energy efficiency in industry. The purpose of this industrial steam and condensate (pipe line) system project was to learn what can be done in the field to improve energy efficiency and how to spread the results and auditing methods to industrial plants. Neither the production of steam nor the use of steam in processes were studied. The results from the project show that much can be achieved even with simple actions.

A case study was carried out in a paper mill. It revealed several encouraging findings. The results affected not only the stream and condensate pipe lines but the whole steam system. The purpose was not only to stop leakages but also present good maintenance and installation practices. The saving potential found was 1.9 % of the steam consumption with payback time approximately 0.4 a. In energy cost this means saving of ~2.4 % and ~3 % reduction of CO2 gas emission.

The report consists of four parts. 1 Part: The purpose and principles of a steam and condensate audit according to Motiva principles. 2 Part: How to carry out a steam and condensate audit and report findings. 3 Part: Example report. 4 Part: Instructions and advice to maintenance department and designers.

In addition a separate measurement guide was also prepared. This guide has two targets, a) How to measure and avoid pitfalls and b) How monitoring should be done.

There are many basic things described in these reports, but it includes also useful reading material to experts on how to improve energy efficiency in steam and condensate pipe lines.