AKORRIT

Additives for Steam Boiler Systems

The fundament for the assessment of boiler water in Austria is the so called „Dampfkesselbetriebsgesetz“ (Law for Operating Steam Boilers, BGBl. No. 212/1992 i.d.g.F.) and the ABV (BGBl. No. 352/1992 i.d.g.F.), which has been passed subsequently to BGBl. No. 212/1992.

An essential part of the corrosion prevention in steam boiler systems is the fight against oxygen: Oxygen in feed water, which can lead to very heavy corrosion in the boiler, is firstly removed largely by thermal degassing; afterwards still existing oxygen has to be fixed with specialised oxygen scavengers like sulfite, DEHA or hydrazine.

For this special corrosion protection purpose in steam boiler systems we are able to offer five basic product types:

Combination products with O2 protection based on sulfite

These products are delivered as combined protection agents, so that by addition of one single product an optimum of corrosion protection is achieved, However sulfite is not steam volatile, hence steam and condensate sections of the system are not protected by these products; on the other hand an unlimited application in the food industry is possible.

  • Protection via phosphatization of the metal surface, fixing of residual oxygen and reduction of alkalinity in the boiler water.

  • Protection via phosphatization of the metal surface, higher oxygen fixing ability and reduction of alkalinity in the boiler water.

  • Protection via phosphatization of the metal surface by a much higher phosphate content, fixing of lower quantities of residual oxygen and reduction of alkalinity in the boiler water.

  • Protection enhencement via phosphatization of the metal surface, fixing of residual oxygen and reduction of alkalinity in the boiler water – primarily suitable for top-up dosage.

  • All-around protection for steam boilers and heating systems, especially for softened, but also for demineralized feed and boiler water, by means of oxygen fixing, phosphatization, stabilization of residual hardness and alkalization.

  • Protection via fixing of dissolved oxygen, especially designed for steam boilers without thermal degassing.

Corrosion protection based on steam volatile amines

These products are partly a matter of steam volatile ingredients, by the help of which steam and condensate sections of a heating system are protected as well. Since e.g. Diethylhydroxylamine (DEHA) shows an exceptional high volatility, the steam and condensate part of the heating system is protected to a peculiar extent.

  • Protection against O2 corrosion by means of the nontoxic, steam volatile DEHA (Diethylhydroxylamine), inside the boiler as well as in the condensate system.

  • Protection for iron and copper, at pH values of 8.0 to 9.0, even for the line system, based on its steam volatile vapor phase inhibitors.

  • Protection by means of a combination of different steam volatile amines, especially within the condensate system, via alkalization and a therewith connected increased oxygen fixing ability.

  • Protection by means of a combination of different steam volatile amines with dispersing agents, for fighting residual hardness in feed water.

Corrosion protection based on hydrazine for high-pressure boilers

These products too comprise steam volatile ingredients, by the help of which steam and condensate sections of a heating system are protected; but the big disadvantage of hydrazine is its toxicity, for which reason hydrazine products are rarely used nowadays, and only in the field of high pressure and operating of turbines.

  • Protection by oxygen fixing and promotion of a magnetite layer as well as by alkalization, which is decisively intensified by the presence of morpholine, especially within the condensate system.

  • Protection by phosphatization of the metal surface, fixing of residual oxygen and increasing the alkalinity in the boiler water, especially in demineralized water or feed water predominantly containing condensate.

  • Combined protection via protection of the boiler by phosphatization of its metal surface, fixing of residual oxygen and increasing alkalinity of the boiler water, and simultaneously protection of the condensate system by release of morpholine and ammonia to the steam, for neutralising the unleashed carbonic acid.

Corrosion inhibition based on film formers

This kind of products forms a greasy protective film on the metal surface which blocks corrosion.

  • Multi-component product for protection of the boiler as well as the steam and condensate system, including fixation of residual hardness.

  • Multi-component product for protection of the boiler as well as the steam and condensate system, for softened as well as partly and thoroughly demineralized waters.

  • Specialised acid amine, for protection of the boiler as well as the steam and condensate system, without obnoxious deposits in case of overdosage.

Protection by Dispersing Agents

To support the effects of corrosion protection agents, so called dispersing agents are used; they produce effects like dissolution, slurrying and stabilizing in solution of corrosion products already existing in a water system, whereby these corrosion products can then be filtered easily with an appropriate filtering device and in this way are removed from the system.

  • Protection against calcium carbonate (limescale), calcium phosphate, gypsum and iron oxides – prevention of boiler scale deposits.

  • Protection against calcium carbonate (limescale), calcium phosphate, gypsum and iron oxides – prevention of boiler scale deposits, even at high salt concentrations.

  • Protection against silica deposits.