Purification Daily Question Series 4
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I. Fill-in-the-blank questions (5 questions, 1 point each, totaling 5 points) 16. Before starting a centrifugal pump, the inlet valve must be ( ), and the outlet valve must be ( ). 17. Before starting a positive-displacement pump (such as a gear pump), the inlet valve must be ( ), and the outlet valve must be ( ). 18. Catalyst poisoning is divided into （ ） poisoning and （ ） poisoning. 19. The factors that affect the heat exchange efficiency of heat exchangers include （ ）（ ）（ ）。 20. Gaseous ammonia dissolves very easily in (), releasing a large amount of () during dissolution. Its aqueous solution is called (), is () in nature, and is volatile. Answer: 16. Answer: Fully open (on), Closed. 17. Answer: Fully open (on), On. 18. Answer: Temporary poisoning, Permanent poisoning. 19. Answer: Heat transfer temperature difference, heat transfer area, heat transfer coefficient (material). 20. Answer: Water, heat, ammonia water, weakly alkaline. It should be noted that respondents are required to keep their answers hidden. If the answerer’s score is not hidden, it is halved. For methods to hide posts, see: http://bbs.hcbbs.com/thread-1551107-1-1.html
16. Turn off/Turn on 17. Turn on/Turn on 18. Temporary/Permanent 19. Heat transfer coefficient, Heat transfer coefficient, Average temperature difference 20. Water, Heat, Ammonia water, Slightly alkaline
16. Turn on, turn off 17. Fully open (turned on), turned on 18. Temporary, permanent 19. Heat transfer coefficient K, heat transfer area S, and average temperature difference △t 20. Water, heat, ammonia water, weakly alkaline
16. Before starting the centrifugal pump, the inlet valve must be (open), and the outlet valve must be (closed). 17. Before starting a positive-displacement pump (such as a gear pump), the inlet valve must be (closed), and the outlet valve must be (open). 18. Catalyst poisoning is divided into (temporary) poisoning and (permanent) poisoning. 19. Factors that affect the heat exchange efficiency of heat exchangers include (improper structure), (incorrect selection of heat exchange surface material), and (poor operation and maintenance). 20. Gaseous ammonia dissolves very easily in (water); a large amount of (heat) is released during this dissolution process. Its aqueous solution is called (ammonia water), which is (alkaline) in nature and volatile.
The last edit to this post was made by 654262293 on 2016-3-15 at 11:41: Before starting the centrifugal pump, the inlet valve must be (fully open), and the outlet valve must be (closed). 17. Before starting a positive-displacement pump (such as a gear pump), the inlet valve must be (fully open), and the outlet valve must also be (fully open). 18. Catalyst poisoning is divided into (temporary) poisoning and (permanent) poisoning. 19. The factors that affect the heat exchange efficiency of a heat exchanger include (heat exchange temperature difference), (heat exchange area), and (heat transfer coefficient). 20. Gaseous ammonia dissolves very easily in (water); a large amount of (heat) is released during this dissolution process. Its aqueous solution is called (ammonia water), which has (weakly alkaline) properties and is volatile
Before starting the 1616 centrifugal pump, the inlet valve must be (fully open), and the outlet valve must be (closed). 17. Before starting a positive-displacement pump (such as a gear pump), the inlet valve must be (fully open), and the outlet valve must also be (fully open). 18. Catalyst poisoning is divided into (temporary) poisoning and (permanent) poisoning. 19. The factors that affect the heat exchange efficiency of a heat exchanger include (heat exchange temperature difference) and (heat exchange area). Before starting a centrifugal pump, the inlet valve must be (fully open), while the outlet valve must be (closed). 17. Before starting a positive-displacement pump (such as a gear pump), the inlet valve must be (fully open), and the outlet valve must also be (fully open). 18. Catalyst poisoning is divided into (temporary) poisoning and (permanent) poisoning. 19. Factors that affect the heat exchange efficiency of a heat exchanger include (heat exchange temperature difference) and (heat exchange area)
16. Before starting the centrifugal pump, the inlet valve must be (fully open), and the outlet valve must be (closed). 17. Before starting a positive displacement pump (such as a gear pump), the inlet valve must be (fully open), and the outlet valve must be (open). 18. Catalyst poisoning is divided into (temporary poisoning) and (permanent poisoning). 19. The factors that affect the heat exchange efficiency of a heat exchanger include (heat exchange temperature), (heat exchange area), and (heat transfer coefficient). 20. Gaseous ammonia dissolves very easily in (water); a large amount of (heat) is released during this dissolution process. Its aqueous solution is called (ammonia water), which has (weakly alkaline) properties and is volatile.
1. Turn on Turn off 2. Turn on Turn on 3. Temporary Permanent 4. Heat transfer coefficient K, heat transfer area S, and average temperature difference △t 5. Water Heat Ammonia Weakly alkaline
16. Before starting the centrifugal pump, the inlet valve must be (fully open), and the outlet valve must be (fully closed). 17. Before starting a positive-displacement pump (such as a gear pump), the inlet valve must be (fully open), and the outlet valve must also be (fully open). 18. Catalyst poisoning is divided into (temporary) poisoning and (permanent) poisoning. 19. The factors that affect the heat exchange efficiency of a heat exchanger include (heat transfer coefficient), (heat transfer area), and (average temperature difference). 20. Gaseous ammonia dissolves very easily in (water); a large amount of (heat) is released during this dissolution process. Its aqueous solution is called (ammonia water), which has a (slightly alkaline) nature and is volatile.
This post was last edited by 654262293 on 2016-3-15 20:45. Before starting the centrifugal pump, the inlet valve must be (fully open), and the outlet valve must be (closed). 17. Before starting a positive-displacement pump (such as a gear pump), the inlet valve must be (fully open), and the outlet valve must also be (fully open). 18. Catalyst poisoning is divided into (temporary) poisoning and (permanent) poisoning. 19. The factors that affect the heat exchange efficiency of a heat exchanger include (area), (temperature difference), and (flow rate). 20. Gaseous ammonia dissolves very easily in (water); a large amount of (heat) is released during this dissolution process. Its aqueous solution is called (ammonia water), which is (alkaline) in nature and volatile.
This post was last edited by 654262293 on 2016-3-15 20:45. 16. Fully open, closed. 17. Fully open, fully open. 18. Temporary, permanent. 19. Area, temperature difference, flow rate. 20. Water, heat, ammonia, alkali