How to measure dry gas flow with a flow meter?

If the upper limit of the differential pressure of the instrument is 201^3, when the flow rate is 70^73, the flow indication error caused by this transmission distortion is about 1^8. The three-valve group may cause transmission distortion. The diameter of the three-valve group is very small. Generally, there will be no major problems when measuring dry gas, steam and liquid. However, when measuring low-pressure gas that may precipitate condensate, it will often Because a drop of condensate is blocked in the flow path of the three-valve group placed horizontally, a large error is caused. The simple way to solve this problem is to change the installation direction of the differential pressure transmitter, change the flow path of the three-valve group from horizontal to vertical, and install the differential pressure transmitter at a high place, as shown in the diagram in Section 3.2.1 3, 15 and Fig. 3, 23 in Sections 3, 2, 3. The transmission distortion caused by the uncertain medium type in the pressure guiding pipe is shown in Figure 9.19 as a design of an integrated differential pressure flowmeter. The flowmeter of this design has no problem at all when it is used to measure the flow of dry gas, but it may have the problem of uncertain medium type in the pressure guiding tube when it is used to measure the flow of steam. If the pressure guiding tube can be filled with steam, there will be no transmission distortion of the differential pressure signal. If the medium in the pressure guiding tube is a mixture of steam, water, and air, since the density of the medium in the positive and negative pressures cannot be completely symmetrical, it may cause distortion in the transmission of the differential pressure signal. For the differential pressure flowmeter with the differential pressure transmitter placed above the throttling device, when it is used to measure the steam flow, from the analysis of the working principle, the vertical (or inclined) pressure guiding pipe must be filled with steam so that the transmitter can receive The differential pressure is equal to the differential pressure generated by the throttling parts, which requires that the inner diameter of the pressure guiding pipe is large enough, and the positive and negative pressure end cut-off valves use gate valves or ball valves. ' in the tube. If this section of pipe is not filled with steam, the specific performance is that the temperature of the pipe above the cut-off valve is lower than 100°C. At this time, condensed water occupies the space in the pipe, and there should be some air at the highest point of the pressure guiding pipe. Due to the positive and negative pressure The gas-liquid medium in the pipe cannot guarantee complete symmetry, which leads to the transmission distortion of the differential pressure signal. In Figure 9.19, the type of medium in the pressure guiding pipe below the cut-off Min is also often uncertain, because condensed water is also likely to be 'hanged' in the pipe because the inner diameter of the pipe is too small. When the flow rate of the flowmeter with this structure is large, the above-mentioned transmission distortion is often not noticed by people, because the residual differential pressure at zero flow caused by transmission distortion is small compared with the differential pressure at high flow, but in the relative This distortion is highlighted at low or zero flow rates. When the flowmeter of this structure is used to measure the steam flow, if the installation position is rotated 90 and the vertical pressure guiding pipe is turned to the horizontal direction, the above-mentioned transmission distortion will be greatly reduced, but attention should be paid to the high and low chambers of the differential pressure transmitter full exhaust.

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