Systems and methods for gas supply and usage
A technology for supplying system and gas, applied in the field of gas (for example, it can solve the problems of difficult to automatically start and rise, difficult to adjust and maintain the minimum heating power and temperature, etc., to achieve long heater life, sensitive response, and fast system response. Effect
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example 1
[0108] refer to figure 1 , this example describes a two-stage cascade control system that dynamically adjusts heating power in response to changes in user flow rate. In this two-stage cascade control system, only the pressure indicating controller (PIC) and the temperature indicating controller (TIC) are coupled. At a given time = 0 seconds, the vessel is warmed and the vessel pressure is stabilized at the PIC set point, eg, 120 psig. Steam flow to user site is zero (ie, BSGS is not working). As soon as the user starts drawing steam flow (eg, time = 0 seconds), the vessel pressure is immediately reduced to, eg, 119 psig. The PIC calculates an output signal based on the -1 psig difference between the vessel pressure and the PIC set point at this time. The output signal from the PIC corresponds to a change in the temperature set point of the TIC, in this case eg +10°F (ie, a 10°F increase in the TIC set point). The TIC then increases heating power to meet the new temperature...
example 2
[0110] refer to figure 1 , this example exemplifies a three-stage cascade control system that dynamically adjusts the heating power to the vessel in response to user flow rate changes. In this three-stage cascade control system, a pressure indicating controller (PIC), a temperature indicating controller (TIC) and a flow indicating controller (FIC) are all coupled. At a given time = 0 seconds, the vessel is warmed and the vessel pressure stabilizes at the PIC set point, eg, 120 psig. The steam flow rate stabilized at the FIC set point to the user site, eg 100 standard liters per minute (slpm). As soon as the user starts drawing steam flow (eg, 110 slpm, eg time = 0 seconds), the vessel pressure immediately decreases to eg 119 psig. The PIC calculates an output signal based on the -1 psig difference between the vessel pressure and the PIC set point at this time. The FIC also calculates an output signal based on the difference between the user steam flow rate and the FIC set p...
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