Questions about pipeline pressure
Thread Content
An issue was discussed in class today: There are two regulating valves on the pipeline from coking to hydrogen production dry gas compressor, one * The one entering the compressor has a setting value of 2 kg, and the other one returning to coking has a setting value of 4.6 kg. The dilemma is, what is the main line pressure in front of the two regulating valves? ? Some of them said it was 4.6 kilograms, but I think it should be higher than 4.6 kilograms. Also, does the regulating valve regulate the pressure in front of the valve or the pressure behind the valve? ? What does it have to do with being suppressed? ?
Question 1: I don't understand your process. Are there two regulating valves in a row on one pipeline? Is the flow two-way? is that so? For question 2, the answer is as follows: 1. The regulating valve can adjust the valve opening according to the variables in front of the regulating valve (temperature, pressure, flow, etc.). 2. The regulating valve can adjust the valve opening according to the variables behind the regulating valve (temperature, pressure, flow, etc.). 3. For regulating valves, the opening of the valve can also be adjusted based on variables (temperature, pressure, flow, etc.) in other locations (such as equipment, other pipelines). 4. For pressure adjustment: Set the pressure point in front of the regulating valve, which is the pressure in front of the control valve. You give a pressure value on the computer or instrument panel, turn on automatic, and the pressure in front of the control valve is controlled at this value. For a positive-acting system, when the pressure in front of the valve is high, the valve channel will automatically open, regardless of the conditions behind the valve. 5. For pressure adjustment: Set the pressure point behind the regulating valve, give a pressure value on the computer or instrument panel, and turn on automatic, and the pressure behind the control valve will be controlled at this value. For reaction systems, when the pressure behind the valve is low, the valve channel will automatically open, regardless of the conditions in front of the valve. 6. Positive effect and reaction are the relationship between the size of the pressure point signal and the driving force (signal) of the control valve opening. High pressure - strong signal - increased driving force - large valve opening, this is the positive effect. ； The pressure is high - the signal is strong - the driving force is reduced - the valve opening becomes smaller, this is the reaction.