【Daily Question 20090211】Three-element control for boiler drum pressure
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To liven up the atmosphere in the area dedicated to technical exchanges on instruments and meters, enhance everyone’s knowledge, and enable collective learning, we are continuing with the “One Question per Day” activity; participants will receive prizes, with those who answer correctly getting extra rewards! (3 points for participants, 5 points for those who answer correctly! ) Can you answer correctly without looking up any information? You cannot copy the content that has already been answered; otherwise it will not be valid The answer reply is available! 1. The three-transmitter level control system for boiler drum incorporates a ____________ signal on top of the two-transmitter control mechanism. Answer: Water supply flow rate 2. The dual-pulse level control system for the boiler drum introduces ____________ as a feedforward signal based on single-pulse control. Answer: Steam flow rate. 3. In the three-element level control system for the boiler drum, ____________ is the controlled variable and the primary impulse signal. Answer: Drum water level
The 3 quantities are the drum level, steam flow rate, and feedwater flow rate, right? 1. Feedwater flow rate 2. Steam flow rate 3. Drum level
1. The three-transmitter level control system for boiler drum incorporates a ____________ signal on top of the two-transmitter control mechanism. Answer: Water supply flow rate 2. The dual-pulse level control system for the boiler drum introduces ____________ as a feedforward signal based on single-pulse control. Answer: Steam flow rate 3. In the three-element level control system for the boiler drum, ____________ is the controlled variable and serves as the primary impulse signal. Answer: Drum water level
1. Feed water flow rate 2. Steam flow rate 3. Drum water level
I think it’s better to answer in reverse order: 3. Drum liquid level, 2. Steam volume, 1. Saturated water volume
1. The three-transmission level control system for the boiler drum introduces the __feedwater flow rate__ signal on the basis of two-transmission control. 2. The double-pulse level control system for boiler drum incorporates __steam flow___ as a feedforward signal, based on the single-pulse control mechanism. 3. In the three-element level control system for the boiler drum, __drum level__ is the controlled variable and serves as the primary signal.
1. Feed water flow rate 2. Steam flow rate 3. Drum water level
Feedwater flow, steam flow, drum level
1. The three-transmitter level control system for boiler drum incorporates a ____________ signal on top of the two-transmitter control mechanism. Answer: Water supply flow rate 2. The dual-pulse level control system for the boiler drum introduces ____________ as a feedforward signal based on single-pulse control. Answer: Steam flow rate 3. In the three-element level control system for the boiler drum, ____________ is the controlled variable and serves as the primary impulse signal. Answer: Drum water level
1. The three-pulse level control system for boiler drum incorporates the _____feedwater flow rate_____ signal on top of the two-pulse control mechanism. 2. The double-pulse level control system for boiler drum incorporates _____steam flow rate_____ as a feedforward signal, based on the single-pulse control mechanism. 3. In the three-element level control system for the boiler drum, ______the drum level______ is the controlled variable and serves as the primary signal. If a simple single-pulse control system for the boiler drum level is used, once the load changes suddenly and a false level appears, the regulator will mistakenly assume that the level has risen and will close the water supply valve. It affected production and even posed a danger. To this end, dual-pulse control for the boiler drum level was adopted; it adds a steam pulse on top of the single-pulse control in order to overcome the \"false level\" phenomenon. The control valve is a air-operated shut-off valve, the level regulator operates in direct mode, and the output signal from the regulator is subtracted from the steam flow signal within the adder. A double impulse is actually a control system that combines feedforward and feedback regulation. However, if there are fluctuations in the feedwater pressure itself, dual-pulse control cannot overcome the impact of these fluctuations in the water supply volume. In other words, an impulse is added to the feedwater flow rate so that its direction of action is consistent with that of the level signal. Since this control system takes into account three parameters – the liquid level, the feedwater flow rate, and the steam flow rate – it is called a three-impulse control system.
Answer: 1. Water supply flow rate 2. Steam flow rate 3. Drum water level
1. Water supply flow rate 2. Steam flow rate 3. Liquid level
My answer: 1. Water supply flow rate 2. Steam flow rate 3. Drum water level
1. Feed water flow rate 2. Steam flow rate 3. Drum water level
1. Answer: Feedwater flow rate 2. Answer: Steam flow rate 3. Answer: Drum water level
1. Feed water flow rate 2. Steam flow rate 3. Drum water level
1) Based on the two-impulse control system, a feedwater flow rate signal is introduced to form a three-impulse control system. 2) The two-impulse level control system for the boiler drum relies on single-impulse control, with steam flow rate being used as a feedforward signal. 3) In the three-impulse level control system for the boiler drum, the controlled variable is the drum level, which serves as the main impulse signal
The answers are: 1. Feed water flow rate 2. Steam flow rate 3. Drum water level
1. The three-element level control system for boiler drum incorporates a (feedwater flow) signal on top of the two-element control. 2. The double-pulse level control system for boiler drum introduces (steam flow rate) as a feedforward signal based on single-pulse control. 3. In the three-pulse level control system for the boiler drum, (drum level) is the controlled variable and the primary pulse signal.
Answer: 1. Water supply flow rate. 2. Steam flow rate. 3. Drum water level.
1. Feed water flow rate 2. Steam flow rate 3. Drum water level