THE CHEMIX SYSTEM

For open and closed cooling water systems

INTRODUCTION

Cooling water systems have as object to disperse some heat quantity.

Because of its characteristics (liquid, high specific heat, availability) water is the most used fluid for cooling equipments or other fluids.

Increase of water cost, decrease of quality and drawing resources, regulations on disposals (thermal pollution) lead to the use of cooling water systems with recycling on atmospheric coolers.

It is generally estimated that, less than 4% of the water needed for a straight flow cooling is used into a recycled system.

Water undergoes a temperature increase at exchanger level, and loses its calories during contact with air.

Water-air heat transfers are trivial, the cooling effect its principally due to water evaporation. The vapor formed will be carried away by external aird and replaced with water.

The application of evaporation as cooling principle will require a special monitoring of the system in order to avoid the different problems inherent to such type of circuit.

During the fierce aeration-taking place into the air-cooled exchanger, some water is transformed into vapor and carried out by natural or forced air draft.

The water eliminated by this way is very pure and dose not contains the varied salts previously dissolved. Evaporated water is make-up with mineralized water, which will quickly increase the salinity of the system, and a limitation will become necessary to prevent from sludge and deposits.

Circulating water during recycling will wash ambient air. Upon the quality of the latest, it is possible to notice biological proliferations or fouling caused by atmospheric dust.

These troubles complete those induced by water itself, i.e. corrosion and scaling due to oxygen for the former and calcium bicarbonate decomposition for the latest.

The problems encountered in cooling systems are in relation with the operating conditions of such systems:

Corrosion

Scale

Biological proliferation

Fouling

For all these reasons, it is necessary to adopt an effective treatment procedure focused on the following two points:

Use or treatment products suitable with expected problems.

Keeping of a concentration ratio economically acceptable taking in account environment and quality of the water used.

TREATMENT OF COOLING WATER SYSTEMS

Make-up water preparation

In the regions where water is hard (300 ppm CaCO3 hardness and 200 ppm as CaCO3 alkalinity it will be favorable to decrease its scaling potential.

Alkalinity reduction: -

It is a de-alkalization with acid.

The addition of a strong acid, generally H2 SO4, displaces a part of hydrgenocrbonates, which are transformed into CaSO4.

The result is an increase of sulfates in circulating water, which can limit the concentration level and develop corrosion phenomena.

CHEMIX PRODUCTS AND APPLCATIONS

CHEMIX 600 S: - Corrosion inhibitor for cooling water systems

CHEMIX SUPPER GUARD: - Scale inhibitor for cooling water systems

CHEMIX ALGEACIDES: Prevent the growth of Green brown, red algae, Fouling by bacteria, fungi