Boiler Water Impurities Quiz
30 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are the most often identified impurities or conditions that are important water quality measures in a boiler system?

  • Oxygen, Nitrogen, Carbon Dioxide, Sulfur Dioxide
  • Iron, Aluminum, Calcium, Chlorine
  • Suspended Solids, Dissolved Solids, Dissolved Gases, pH (correct)
  • Copper, Lead, Zinc, Chromium

    • What typical problem results from sludge being carried along by flowing water in a boiler system?

  • Formation of scale from salts
  • Deposition on the boiler heat transfer surfaces (correct)
  • Reduced efficiency
  • Corrosion in the hottest areas of the boiler

    • What is the result of salts that are insoluble under the conditions inside the boiler?

  • Carryover
  • Reduced efficiency
  • Formation of scale (correct)
  • Corrosion

    • What is the potential effect of carryover from impurities downstream from the boiler in a boiler system?

    <p>Negative impact on the purity of the steam contacting susceptible parts of the energy plant</p> Signup and view all the answers

    What is the potential consequence of any impurity in a boiler system?

    <p>Reduced efficiency</p> Signup and view all the answers

    What is the general relationship between the operating pressure of a boiler and the required purity of the feedwater in a boiler system?

    <p>Higher operating pressure requires purer feedwater</p> Signup and view all the answers

    What is the primary concern regarding the presence of oxygen and carbon dioxide in water for Power Engineers?

    <p>Boiler corrosion</p> Signup and view all the answers

    How does the solubility of gases in water change with an increase in temperature?

    <p>Decreases</p> Signup and view all the answers

    What is the purpose of using deaerators in controlling dissolved oxygen in boiler water?

    <p>To reduce the dissolved oxygen level</p> Signup and view all the answers

    How does carbon dioxide affect metal surfaces in condensate return lines?

    <p>It causes grooving</p> Signup and view all the answers

    What does a high pH value in boiler water indicate?

    <p>Basic or alkaline solution</p> Signup and view all the answers

    What is the main reason for adding sodium hydroxide (caustic soda) to boiler water?

    <p>To increase pH</p> Signup and view all the answers

    What effect does high pH boiler water have on ferrous boiler metal?

    <p>Dissolves the metal</p> Signup and view all the answers

    What is the primary concern related to a pH lower than 8.5 in boiler water?

    <p>Increased corrosion</p> Signup and view all the answers

    How does acidity affect the water from lakes and rivers?

    <p>No effect on acidity</p> Signup and view all the answers

    What is the primary purpose of using lime exchangers softeners and anion exchangers for dissolved solids removal?

    <p>To reduce chloride and fluoride concentration</p> Signup and view all the answers

    What happens to dissolved gases like nitrogen and ammonia as the temperature increases?

    <p>Their solubility decreases</p> Signup and view all the answers

    What is one of the major reasons for the treatment of impurities found in water supplies by external systems?

    <p>To remove dissolved solids</p> Signup and view all the answers

    What is the main purpose of external treatment of boiler water?

    <p>To treat the raw water before it enters the boiler/steam cycle</p> Signup and view all the answers

    What are suspended solids in boiler water mainly composed of?

    <p>Insoluble substances held or suspended in the water</p> Signup and view all the answers

    How are Total Suspended Solids (TSS) usually determined?

    <p>By running a given sample of water through a standard 2 µm filter and measuring the amount of solids filtered out</p> Signup and view all the answers

    What is the most common method of reducing the levels of suspended solids in boiler water?

    <p>Pressure filtration</p> Signup and view all the answers

    What is the main problem caused by dissolved solids in boiler water?

    <p>Reduction in heat transfer efficiency</p> Signup and view all the answers

    Which technology can be used to remove silica from boiler water?

    <p>Lime softening</p> Signup and view all the answers

    What is the main problem caused by scale buildup in a boiler?

    <p>Reduced heat transfer efficiency</p> Signup and view all the answers

    How can sludge and scale buildup lead to boiler overheating?

    <p>By making heat transfer surfaces rough</p> Signup and view all the answers

    What is the primary cause of foaming in a boiler?

    <p>Presence of oils in the boiler water</p> Signup and view all the answers

    How can foaming impact the produced steam?

    <p>Make the steam drier</p> Signup and view all the answers

    What technology can be used to remove colloidal silica from boiler water?

    <p>Reverse osmosis</p> Signup and view all the answers

    What is the main purpose of internal treatment within a boiler?

    <p>To add specific chemicals that target problematic impurities</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser