【Question 100】Boiler Basic Questions (April 11)

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This post was last edited by zgj2405 on 2010-4-11 at 13:38. Please hide your replies; think carefully before posting, as edits are invalid! Those with different views on the provided answer keys can post discussions the next day. For multiple accounts under the same IP responding to participate, only the first response is considered valid. All participants receive 2 points as a reward. This round consists of multiple-choice questions, with 2 points for each question; an additional 5 points are given for getting all answers correct. In principle, answers are graded within 48 hours. For the specific method of hiding it, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2% 1. The most fundamental way to prevent low-temperature corrosion in air preheaters is ( ). A. Desulfurization before the furnace B. Operation at low oxygen levels C. Use of glass tubes in the final stage of the tubular air preheater D. Activation of the warm air heater to ensure that (flue gas temperature + air preheater inlet temperature) is greater than the flue gas dew point temperature. 2. The driving force for the natural circulation of water in a water-tube boiler is generated by the ( ) between the rising tubes and the descending tubes. A. Height difference　　　　　　　　　B. Difference in specific gravity of the working fluid C. Temperature difference of the working fluid　　　　　D. Difference in flow resistance 3. The most common fault that occurs in pressure-type or return-oil-type boiler injectors is ( ). A. Filter damage　　　　　　　　B. Atomization tablets broken C. Carbon deposition in the nozzles　　　　　　　　D. Backflow valve stuck 4. The function of the air preheater in a fuel boiler is ( ). A. Increase the supply air temperature　　　　　B. Ensure good mixing of air and oil C. Lower the exhaust gas temperature　　　　　D. A and C 5. Which of the following factors can easily cause a cold explosion in a boiler? A. Carbon deposition in the flue　　　　　　　B. Excessive air supply C. Carbon deposition on the spool of the oil supply solenoid valve　　　D. Ignition using the residual heat in the furnace