Alar low pressure gas pressure regulator right angle moistening parameter complete decompression level selection is usually used for pressure sled in the transmission station to use first class decompression, but when the pressure drop is large, such as self used gas sled, generally from 8~9MPa to 0.2~0.4MPa, then multilevel decompression is required.
The two - stage decompression of the self - used gas sled is also a configuration optimization scheme for the gas equipment technicians for many years. At present, China has taken the lead in changing the previous first class decompression. The first level decompression of self used gas sled has been used in the past, which has proved that there are many problems, such as easy ice blocking, easy surge, large noise and so on, which causes the self used gas sled to work steadily from the trial operation. The main disadvantages of the single step pressure reduction when the pressure difference is large is that the pressure drop is too large, the opening of the valve mouth is very small and the small flow is especially severe, which causes the valve mouth circulation area to be too small, sometimes even to 1%, the large pressure drop causes the temperature drop too large, if the heat exchanger is not heated, such as the heat exchanger scaling, then the temperature drop is in the temperature drop. Under the condition of large opening and small opening, the valve mouth is easy to send cattle ice blockage.
After the ice jam occurred, the downstream pressure dropped rapidly because the flow channel was blocked. The AQ type pressure regulator will automatically open, the high speed gas flows through and the ice block is blown away, which makes the circulation area rise abruptly, the downstream will be overpressure, and the regulator closes quickly... So repeated, the formation of a surge. Mengzhou RTZ natural gas regulator, Ruifeng factory, provides decompression type selection.
At the same time, because of the small opening of the valve opening, and when there are particles in the flow channel, it is easy to cause the damage of the valve mouth, so that the AQ type voltage regulator of the Runfeng production is invalid and the overpressure is cut off. The solution is to use the two level decompression, for example, in the self - used gas sled, the inlet pressure can be reduced from 8~9MPa to 4~6MPa, how much to be reduced, and an optimal intermediate force is obtained by calculation. Then the exit pressure is reduced to 0.2-0.4MPa by two levels. This can not only make the depressurization task evenly distributed to the two stage decompression, but also reduce the load of each stage heater. More importantly, it is still possible to get a good valve opening in the case of small flow, avoiding the surge and high noise. Mengzhou RTZ natural gas regulator, Ruifeng factory, provides decompression type selection.
The selection of the pressure reduction level is not mandatory, but when the pressure drop is more than 5~6MPa, the pressure reduction level should be considered by calculating the opening of the valve under the maximum pressure difference and the minimum flow condition. This will make the AQ type pressure regulator working in the suitable opening range and allow the AQ type voltage regulator to be the most productive. The optimum characteristic curve is worked in the interval, thus obtaining the optimum working quality of the whole voltage regulating skid. Mengzhou RTZ natural gas regulator, Ruifeng factory, provides decompression type selection.
On the basis of following the relevant standards as the basic principles, the system configuration of the pressure regulating skid still needs to be analyzed and configured according to the actual situation of the project implementation. Because of the particularity of each item, it is difficult to generalize the technical scheme and the selection method. It is necessary to study and analyze the technical water parameters in the practice, and take full consideration of the user characteristics, such as the character of the user, the management level, the operation experience and so on, to determine the most suitable configuration scheme.
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