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Within the Power Generation Industry there are basically three application areas for chemicals.

Power Generation

Within the Power Generation Industry there are basically three application areas for chemicals. These are for the treatment of the boiler feed water, the recirculation of the cooling tower water and the effluent treatment plant. Depending on the power source for the power station it will make a difference to the operating pressure within the boiler drum. Generally coal-fired power stations run at around 200 bar; CCGT plants operate the high pressure drum at 120 bar while in combined heat and power plants these run at lower pressures in the order of 60 bar. The treatment required for demineralised boiler feed is the use of an oxygen scavenger which will either be a commodity product like hydrazine or a speciality product such as carbohydrazide. These will be injected into the outlet of the deaerator. Also added on the discharge side of the deaerator will be an amine or ammonia, although if the latter is required then careful consideration has to be given to the storage tanks as the vapours will require scrubbing. Lastly, phosphates are added to the boiler drum. These can either be blended or trisodium phosphate and this is where the high pressure pumps are required.

For the treatment of the open evaporative cooling towers you will be adding an oxidising biocide like sodium hypochlorite. In order to optimise the use of the sodium hypochlorite acid will be dosed to control the pH.   For smaller cooling circuits the use of sodium hypobromous acid can be used which is a blend of sodium bromite and sodium hypochlorite.

The prevention of Legionnaires disease is paramount in cooling towers and Gee’s System is ideal for this application.  HSE Document HSG274 Part 2 refers to the use of chlorine dioxide and the appropriate levels of treatment. Careful selection of the right equipment is necessary to achieve the results required. Gee & Co can supply and install suitable Chlorine Dioxide preparation and automatic systems.

Lastly a corrosion inhibitor will be introduced into the system which is usually dosed in proportion to the make up water.

Finally, there is the effluent treatment plant which will require pH correction as this will be receiving the blowdown from the boilers plus the regen liquors from the demineralisation plant.

Power Generation Technical Approach & Product Recommendations

Process Stage Problem Chemical Solution Gee’s Solution
Boiler Water Treatment Boiler Corrosion & Scaling Hydrazine Gee Dosing Pumps
  Carbohydrazide Gee Dosing Skids
  Trisodium Sulphate  
  Blended Phosphate  
Cooling Towers Legionella Biocide Treatment Gee Dosing Pumps
  Sodium Hypochlorite Gee Dosing Skids
  Hypobromous Acid Gee Package Units
    Gee Tanks
  Chlorine Dioxide Chlorine Dioxide Generation System
Cooling Towers pH Control Inorganic Acid Gee Dosing Pumps
    Gee Dosing Skids
    Gee Package Units
Effluent Treatment Disposal Ion Exchange Inorganic Acid Gee Dosing Pumps
Regeneration Liquor & Boiler Blowdown Inorganic Alkalies Gee Dosing Skids
    Gee Package Units
Final Discharge Disposal of cooling tower Sodium Bisulphite Gee Dosing Pumps
Purge water   Gee Dosing Skids
    Gee Package Units