Boiler water quality is of prime concern to all boiler operators. The process of water treatment in boilers is not limited to producing high quality DM water. The stringent water chemistry requirements of Supercritical power plants makes water treatment in boilers a very critical aspect of power plant operation. This necessitates the use of a high quality water treatment system.
Boiler contaminants: jeopardising power plant operation. 05 August 2014. Optimum positioning of analytical instruments at key points throughout the water and steam cycle and water treatment plant on modern power stations can provide operators with a valuable insight for improving plant efficiency and cost effectiveness.
Excellent steam purity is essential for a turbine operation It is essential to monitor the steam purity of the steam going to a high pressure turbine. This includes: 1) Monitoring the steam purity of the silica, sodium and cation conductivity where possible 2)Maintaining very good control of the boiler chemistry
The only way to control silica buildup is through an effective monitoring regime. Like sodium, silica should be measured at multiple points around the steam system, including the demineralization
Despite advances in conventional deposit control technologies, high-silica boiler water (>150 mg/L as SiO2) continues to have a major impact on the operation and efficiency of boilers.
quickly achieve and control boiler feedwater and steam chemistry. Although increasing blowdown and makeup demineralized water to the cycle is effective for cleaning drum boilers, these simple Controlling silica levels in the steam is important as silicate scaling may contribute to turbine capacity and efficiency losses. Monitoring
Steam cycle Begins at the boiler where thermal energy in superheated steam is converted to mechanical energy in the propulsion turbine Steam is then converted into condensate in the main condenser Condensate is combined with distilled makeup water and is pumped as feedwater through heaters to a
Silica in steam - SlideShare. Aug 04, 2014· Silica in steam. SILICA CARRYOVER Investigation of the problem of silica carryover in a laboratory experimental boiler revealed two important facts: With constant pressure and boiler water pH, silica carryover is directly propor- tional to the amount of silica in the boiler water.
On the left: Maximum boiler water silica allowable to mantain less than 0.02 ppm silica in the steam. The most significant factor is to maintain low silica concentrations in the boiler water. This can be gained through external treatment equipment for make up water or monitorning and controlling the condensate contmination.
Effects of Carryover Boiler water carryover can cause deposits to form in valves, heat exchangers, turbines, and superheaters. If deposits are significant, heat transfer and/or turbine efficiency may be reduced. Additionally, carryover can strip away the protective magnetic layer on steam lines, remove the film formed by filming amine programs, cause erosion-induced corrosion, and result in
Silica from CW is another damaging factor as it deposits on turbine. Silica needs to be controlled at DM plant also. The percentage of impurity allowed in boiler water/steam is function of boiler operating pressure, so, more critical for high pressure boilers.
For example, in a 900 psi boiler the recommended maximum drum water silica concentration is 2.8 ppm to keep silica below 10 ppb in the steam. In a 2,400 psi boiler the recommended maximum is 0.2 ppm!
Impurity in Steam Affect: - High silica in steam - Phosphate carry over - High level of water in drum Affect: - Solids carry over in steam will lead to deposits on turbine blades, increase of first stage pressure and increase of axial shift of turbine rotor Corrective Action: - Monitor boiler water chemistry and operate CBD as per chemist's
hydroxide (plus carbon dioxide which goes off with the steam). Sodium hydroxide and/or sodium carbonate may be present as excess treating chemicals in the effluent from a lime-soda softener; the use of such pre-treating equipment automatically provides the alkali required for alkalinity control in the boiler water. Most raw waters contain
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