Skip to main content

Posts

Showing posts with the label Boiler

Why does vacuum in steam condenser reduce or drop??

  1-High exhaust temperature: Vacuum drops or maintains at lower side due to high exhaust steam temperature flow into steam condenser. This high exhaust temperature is mainly due to 1-Operation of Turbine at lower loads 2-More clearance in labyrinth seals 3-Not operating exhaust hood sprays 4-More load on condenser 5-Breaking of ejector U loop 2-Low circulating cooling water flow Vacuum in condenser reduces due to inadequate cooling water flow through steam condenser. This is mainly due to; 1-Problems associated with pumps 2-Air pockets in pipe line 3-Leakages in cooling water line 4-Stuck of discharge valve of pump 3-High cooling water temperature at condenser inlet Higher cooling water temperature at condenser inlet results into reduction of vacuum due to poor heat transfer from steam to water 4-Poor heat transfer in condenser Very less or poor heat transfer in steam condenser reduces vacuum to very low level resulting into high exhaust temperature &am

On line water & steam leakage arrester and sealants

  Lucifer Waterproof Rubberized Adhesive Sealant Tape Stop Leaks Seal Sealant Repair Tape 2-Buyyart Polyimide Heat Resistant/High Temperature Adhesive Tape (10mm)                                                 3-RUDRA Waterproof Adhesive Sealant Tape Stop Leaks Seal Repair Tape                                                 ` 4-Online Transformer Oil Leak Sealant                                                           5-THEMISTO - built with passion RT1 Royal Tools Silicon Sealant Gun                                          6-J-B Weld 8281 Professional Size Steel Reinforced Epoxy                                                       7-Blue Magic 16002TRI QuikSteel Steel Reinforced Epoxy Putty Repair                                               

Challenging situations & troubleshooting during Boiler light up & start up

  1-Unavailability of start-up equipments/Competent Man power etc: As we aware after long shutdown or after maintenance activities, we face following common problems Not closing of work permits, Not normalizing equipment like Boiler fans, Fuel feeding system equipments from electrical department No trial of equipments prior to Boiler light up. Solution: Preparation of check lists for pre light up of Boiler Equipments trial & interlock testing Ensuring competent persons for light up activities Factors considered for Boiler design Boiler calculations for Boiler operation engineer (BOE) exam 2-Boiler light up failure: The main reasons for Boiler light up failure are; Improper selection of fuel (coal, bagasse) : High moisture content fuel may lead to late light up or complete failure Foreign materials in fuel may lead to clinker Improper fuel: air mixture can lead to clinker formation Following wrong SOP of light up Not achieving 3T’s of combustion (Temperature. T

Factors considered for Boiler Engineering & Design

Factors considered for Boiler engineering/Boiler Design 1-Boiler Design code: IBR 1950 with latest all amendments 2. Ambient air temperature : Depends on the location of the plant, in India Generally 30 to 45 Degree C is considered. 3. Relative humidity for performance: (Normal: 60% to 70%, Maximum: 80% & Minimum: 20%).Generally it depends on site condition 4. Wind Velocity & direction for structure design: as per IS 875 (39 m/sec) 5. Seismic coefficient As per Is 1893 Zone-I 6. Wind velocity for insulation: generally 1 m/sec Why & How these in Boilers?? 7 - Maximum Continuous Rating (MCR) required for particular process or use: It is the capacity of the Boiler in TPH or Kg/hour required. 8-Operating pressure & temperature: Operating pressure & temperature of the Boilers depends on the requirement of process of prime mover. Higher the operating parameters higher will be the Boiler efficiency & lower will be the fuel consumption. For high press

25-Questions & Answers on AFBC Boilers

  1-What do you mean by AFBC Boiler? Atmospheric Fluidized Bed Combustion (AFBC) boilers are those, which have the potential to use alternative fuel sources such as coal, wood, or waste or any other low grade fuel, and are able to reduce and control nitrogen oxide (NOx) and sulphur dioxide (SO 2 ) emissions. 2-List down the advantages of FBC boilers over other boilers?           FBC boilers have higher combustion efficiency.           Any low grade fuel can be burnt in FBC Boilers           Boiler size is compact as compared to travelling grate & pulverized boilers.           Different variety of fuels can be burnt           Very high ash content fuel can be burnt           Over & under feed fuel feeding system availability           Higher turn down ratio 3-Briefly explain the process of fluidisation? When an evenly distributed air or gas is passed upward through a finely divided bed of solid particles such as sand supported on a fine mesh, the particles
close