Daily topic in the Quality Section: Special equipment, 12/29. Classified by heat transfer medium, the types of boilers that are not included are ( ).

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This post was last edited by xu*ang309 on 2010-12-29 at 10:22. Classified by the heat transfer medium, the types of boilers do not include (). A. Steam boiler B. Hot water boiler C. Organic heat carrier boiler D. Shell and tube boiler Notes for the daily topics in the Quality Section: 1) All participants will receive a reward: 5–20 points for the topic-related post of each day, with this amount possibly increased as appropriate. For multiple-choice questions, scores are assigned based on the order in which responses are submitted: 2nd floor: 10 points, 3rd floor: 9 points, 4th floor: 8 points, 5th floor: 7 points, 6th floor: 6 points; 5 points or more for responses from the 7th floor onward. No points are given for incorrect answers. Doubling of detailed descriptions and sources is available. No scoring will be given for replies on the second day. 2) Please hide your replies; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html 3) Do not edit your replies after posting them, as replies that are edited will not be scored. 4) Due to the busy work of moderators, they can move posts down on the following day. 5) Please ask the moderators in the Quality Section to post actively and provide ratings promptly, especially for topic posts that were not posted by them themselves; they should give timely and accurate ratings. Moderators are reminded to mark processed posts as read to avoid redundant work. Spam posts should not be encouraged, and moderators need to issue warnings; in cases of malicious spamming, points can be deducted or the posts can be deleted. These are the key measures used by the Quality Section to encourage posting. 6) Members are welcome to propose daily topics; these topics should be rich in content and not be limited to multiple-choice questions only. More discussion-based content and Q&A posts should be included to encourage members’ participation. Boilers can be classified from different perspectives: 1. Based on the flow of flue gas within the boiler: water-tube boilers, fire-tube boilers, and combined water-fire-tube boilers. 2. Based on the placement of the boiler drum: vertical boilers, horizontal boilers. 3. Based on their purpose: domestic boilers, industrial boilers, power station boilers. 4. Based on the working medium: steam boilers, hot water boilers, dual-purpose steam and hot water boilers, organic heat carrier boilers. 5. Based on the method of installation: quick-install boilers, assembled boilers, bulk boilers. 6. Based on the fuel used: coal-fired boilers, oil-fired boilers, gas-fired boilers, waste heat boilers, electrically heated boilers, biomass boilers. 7. Based on the water circulation system: natural circulation, forced circulation, mixed circulation. 8. Based on pressure: atmospheric pressure boilers, low-pressure boilers, medium-pressure boilers, high-pressure boilers, ultra-high-pressure boilers. 9. Based on the number of boiler drums: single-drum boilers, double-drum boilers. 10. Based on whether combustion takes place inside or outside the boiler: internal combustion boilers, external combustion boilers. 11. Based on the flow pattern of the working fluid in the evaporation system: natural circulation boilers, forced circulation boilers, once-through boilers, etc. 12. Classification by manufacturing grade: Grade A, Grade B, Grade C, Grade D, Grade E (classified by the pressure of the boilers manufactured)