[Q&A Question 242] 2017.08.30
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【Q&A Question 242】August 30, 2017: What is the speed control mechanism of the circulating hydrogen compressor (turbine)? (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The secondary oil pressure is used to control the operation of the hydraulic actuator, thereby opening or closing the intake valve and thus achieving speed increase or decrease. The way answers are displayed for daily activity questions is about to change. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Zone – “Creative Ideas for Energy Saving” campaign (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum Website)
Turbine speed control is achieved by adjusting the opening of the governor in order to control the amount of steam entering the turbine, thereby regulating its speed. In other words, the governor is a control valve that operates in automatic mode; the actual speed of the turbine is adjusted by changing the opening degree of the governor, thereby altering the amount of steam entering the turbine and thus bringing its speed up to the desired level.
The oil control pressure is converted into electrical signals to adjust the opening degree of the quick-shut valve, thereby regulating the steam flow and thus the speed
Adjust the steam feed by regulating the steam valve
Based on the outlet pressure of the compressor, in high-pressure hydrogenation units, the cycle hydrogen compressor is driven by a turbine; the speed of this turbine is adjusted according to the outlet pressure of the cycle hydrogen compressor, so as to accelerate or decelerate it and achieve the desired pressure for carrying out the hydrogenation reaction.
The rotation speed signal is input and transmitted to the electro-hydraulic converter, where it is converted into secondary oil pressure. This secondary oil pressure is used, via a throttle valve, to control the size of the air valve through an actuator. .
The turbine speed control system consists of four components: a speed sensing mechanism, a transmission and amplification mechanism, a steam distribution mechanism, and a feedback mechanism. Among them, the speed sensing mechanism converts the rotor’s speed signal into a primary control signal ； The transmission amplification mechanism performs power amplification on the primary control signal and carries out control calculations according to the desired adjustment, thereby generating the control signal for the hydraulic motor ； The steam distribution mechanism converts the stroke of the oil-driven motor into the opening degrees of various control valves; through its nonlinear transmission characteristics, a nearly linear relationship is established between the steam inflow rate of the turbine and the stroke of the oil-driven motor.
The speed control section generates speed pulse oil through rotational damping, with a disc valve throttling device serving as the first stage of amplification.
Adjusted according to the inlet pressure of the cyclic hydrogen compressor