The “POWER CHEMISTRY” sector is an independent unit within the structure of “TECHENERGO” EAD. It participates in the performance of engineering in the field of economical usage of the power and fuels in the power facilities of TPPs, NPPs, and HPs (heating plants).
1. Technological Activities:
• Commissioning and shake-down of water preparation and softening plants in TPPs, HPs, and industrial enterprises;
• Rehabilitation of water preparation and softening plants, restoration of waste ion-exchange resins;
• Development of processes and schemes for the chemical cleaning of power and industrial boilers, turbine generators, capacitors, and their performance;
• Conservation of power, heating and industrial boilers (short and long term);
• Examination and adjustment of water chemical operation modes in power, heat-and-power, heating, and industrial steam boiler plants;
• Development, jointly with the “Heat and Nuclear Power Industry” chair at the Technical University, Sofia, of expert systems for technical diagnostics of facilities in TPPs, operating as a consultant of the operator on duty in real time;
• Chemical cleaning of heating surfaces of water heating boilers from acid soot, when black oil operated;
• Follow-up of the behavior of colloid silicon acid in the condense-and-feeder section; evaluation and recommendations;
• Identification of oxygen soak-up occurrences into the scheme of the condense-and-feeder section, combined with heat-and-technical trials; evaluation and recommendation;
• Investigation as to necessity of condense removal plants (CRPs); participation in start-up and shake-down of the CRP process mode;
• Participation in establishing the start-up and shake-down process mode of newly constructed FGD plants;
• Correction of the system water mode from the heat-and-power plants;
• Introduction of a correction reagent in case of necessity with the conducted water chemical process mode.
2. Laboratory Activities
• Analyses of water, steam, and condensate from TPPs and HPs;
• Determination of the quantitative and qualitative composition of deposits on heating surfaces of the facilities (boilers, turbines, capacitors), assessment of their corrosion condition, and performance of a water chemical process mode (WChM) at TPPs in case of repair;
• Determination of the quantitative and qualitative composition of deposits on heating surfaces at HPs & industrial steam boiler plants in case of repair;
• Determination of the operational characteristics of ion-exchange resins from desalination and softening plants, and evaluation of their fitness;
• Analyses of solid fuels.
The “POWER CHEMISTRY” sector offers also:
CHEMICAL CLEANING OF HEATING CONVECTIVE SURFACES OF GAS-AND-BLACK OIL BOILERS FROM ASH DEPOSITS ON THE FLUE GAS SIDE
The proposed process is effective, non-labour consuming, quick-action, and economically beneficial.
The removal of these acid ash deposits necessitates due to the following main reasons:
• Lowering the resistance of the gas section;
• increasing the temperature of the exhaust gases;
• provision of normal work conditions for the personnel during repair works;
• considerable reduction of corrosion wear of the boiler steel.
The process is developed based on selected samples of ash deposits (soot) which are tested under laboratory conditions. This information is used as a methodology for calculating the quantity of reagent needed for the cleaning.
Method Advantages:
The average corrosion speed during the performed water flushes constitutes 50 – 70 h /m2 .h/; during the period of sewage water flushes and during cleaning with alkaline solutions in the presence of inhibitors it is reduced 3 – 5 h /m2 .h/. Besides the considerable loss of metal, a modification of the nature of corrosion is observed. Local corrosion under the impact of the solutions becomes uniform.
Another advantage of the given method of cleaning is the opportunity to separate the hardly soluble deposits strongly cohesive to the surface of the pipes of the convective bundles. This is achieved by the combination of loosening and partial separation of the deposits as a result of a thermal flux determined by the different temperature of the washing solution and the chemical impact of the reagent, whereby the solubility of the deposits is increased.
The method has been successfully used for cleaning outside heating surfaces with energy values of 50/100 Gcal and a water volume of 30 м3.
1. Technological Activities:
• Commissioning and shake-down of water preparation and softening plants in TPPs, HPs, and industrial enterprises;
• Rehabilitation of water preparation and softening plants, restoration of waste ion-exchange resins;
• Development of processes and schemes for the chemical cleaning of power and industrial boilers, turbine generators, capacitors, and their performance;
• Conservation of power, heating and industrial boilers (short and long term);
• Examination and adjustment of water chemical operation modes in power, heat-and-power, heating, and industrial steam boiler plants;
• Development, jointly with the “Heat and Nuclear Power Industry” chair at the Technical University, Sofia, of expert systems for technical diagnostics of facilities in TPPs, operating as a consultant of the operator on duty in real time;
• Chemical cleaning of heating surfaces of water heating boilers from acid soot, when black oil operated;
• Follow-up of the behavior of colloid silicon acid in the condense-and-feeder section; evaluation and recommendations;
• Identification of oxygen soak-up occurrences into the scheme of the condense-and-feeder section, combined with heat-and-technical trials; evaluation and recommendation;
• Investigation as to necessity of condense removal plants (CRPs); participation in start-up and shake-down of the CRP process mode;
• Participation in establishing the start-up and shake-down process mode of newly constructed FGD plants;
• Correction of the system water mode from the heat-and-power plants;
• Introduction of a correction reagent in case of necessity with the conducted water chemical process mode.
2. Laboratory Activities
• Analyses of water, steam, and condensate from TPPs and HPs;
• Determination of the quantitative and qualitative composition of deposits on heating surfaces of the facilities (boilers, turbines, capacitors), assessment of their corrosion condition, and performance of a water chemical process mode (WChM) at TPPs in case of repair;
• Determination of the quantitative and qualitative composition of deposits on heating surfaces at HPs & industrial steam boiler plants in case of repair;
• Determination of the operational characteristics of ion-exchange resins from desalination and softening plants, and evaluation of their fitness;
• Analyses of solid fuels.
The “POWER CHEMISTRY” sector offers also:
CHEMICAL CLEANING OF HEATING CONVECTIVE SURFACES OF GAS-AND-BLACK OIL BOILERS FROM ASH DEPOSITS ON THE FLUE GAS SIDE
The proposed process is effective, non-labour consuming, quick-action, and economically beneficial.
The removal of these acid ash deposits necessitates due to the following main reasons:
• Lowering the resistance of the gas section;
• increasing the temperature of the exhaust gases;
• provision of normal work conditions for the personnel during repair works;
• considerable reduction of corrosion wear of the boiler steel.
The process is developed based on selected samples of ash deposits (soot) which are tested under laboratory conditions. This information is used as a methodology for calculating the quantity of reagent needed for the cleaning.
Method Advantages:
The average corrosion speed during the performed water flushes constitutes 50 – 70 h /m2 .h/; during the period of sewage water flushes and during cleaning with alkaline solutions in the presence of inhibitors it is reduced 3 – 5 h /m2 .h/. Besides the considerable loss of metal, a modification of the nature of corrosion is observed. Local corrosion under the impact of the solutions becomes uniform.
Another advantage of the given method of cleaning is the opportunity to separate the hardly soluble deposits strongly cohesive to the surface of the pipes of the convective bundles. This is achieved by the combination of loosening and partial separation of the deposits as a result of a thermal flux determined by the different temperature of the washing solution and the chemical impact of the reagent, whereby the solubility of the deposits is increased.
The method has been successfully used for cleaning outside heating surfaces with energy values of 50/100 Gcal and a water volume of 30 м3.