Online Cleaning of Pressurised Units

Clean pressurised units without direct line of sight of fouled areas using Therma-Chem.

Online Cleaning Specialists

Many online cleaning companies require intensive manpower and line of sight of the fouled area within a boiler to ensure that their products can remove the ash deposition.

Therma-Chem do not require this as our chemical is designed to be injected into the furnace and then react with deposits in every area of the unit due to the gasification and immense expansion of the chemical.

Our injection equipment can be set-up on a pressurised system close to the burner area and operated with minimal manpower requirements. The beauty about the chemical is that once injected into the furnace it will react with deposits throughout the unit from the furnace through to the stack. Areas that are ordinarily difficult to reach, such as the mid-bank of the superheaters and economisers, are easily cleaned using our unique technology.

An example of an injection system on a pressurised boiler.

How Does FS12 Work

Therma-Chem’s FS12 is an mildly alkaline solution containing nitrates that is designed specifically to clean boilers online. Using Therma-Chem’s proprietary injection system, the liquid is injected directly into the furnace, vaporises and is carried by the flue gas through the unit, encountering all heat transfer surfaces including the superheaters, economiser, and air pre-heater.

FS12 reacts with existing hard deposits and fouling on tubes by increasing their melting point and reduces them to soft powdery ash.

FS12 also neutralises sulphur deposits on the cold end of the flue gas path preventing cold end corrosion and eases man entry during a maintenance or inspection shutdown.

Therma-Chem have many years of experience in cleaning both CO Boilers and Waste Heat Boilers online and specialise in dealing with catalyst based fouling downstream of FCCs resulting in increased efficiency and availability.

Application Methods

FS12 is traditionally applied to process heaters in one of three ways:

Maintenance Dosing

Applied daily, FS12 keeps units clean and prevents costly drop offs in performance and avoids the possible need for shutdowns during the operating campaign. This is the most common method of application with some customers having used Therma-Chem every day for 15 years across multiple units.

Online Recovery Cleaning

When a unit is load and/or temperature restricted mid-run and there is no window to shut down for maintenance, FS12 is introduced to recover performance. Injected 3-4 times per day over a period of 30-90 days, depending on the severity of the fouling, FS12 can target any part of the unit loosening deposits and restoring performance. We would then recommend switching to Maintenance Dosing to prevent a drop-off in performance recurring.

Pre Shutdown Cleaning

Utilised in the run up to a shutdown to facilitate a more effective and easier clean of a unit, FS12 can be applied 3-4 times per day for a period between 30 – 90 days.This ensures that during the shutdown, cleaning is more effective, easier, quicker and any sulphuric deposits are neutralised, dry, and entry into all areas of the unit is safe and comfortable.