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On-line measurement method for pressure drop ratio of adjusting valve

A technology for regulating valves and test points, which is applied in the direction of measuring fluid pressure, measuring devices, and pressure difference measurement between multiple valves, etc. It can solve the problems that the control effect cannot reach the design goal, etc.

Inactive Publication Date: 2010-10-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Naturally, the resulting control effect cannot reach the design goal

Method used

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  • On-line measurement method for pressure drop ratio of adjusting valve
  • On-line measurement method for pressure drop ratio of adjusting valve
  • On-line measurement method for pressure drop ratio of adjusting valve

Examples

Experimental program
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Embodiment

[0035] Figure 5 It is a schematic diagram of the process flow of the catalytic cracking stable absorption system of a refinery. The stable absorption system mainly includes a container 1 , a cooler 2 , a stabilization tower 3 , a reboiler 4 , a regulating valve 5 , an absorption tower 6 , a desorption tower 7 , a separation tower 8 and a pump 9 . Among them, the regulating valve 5 of the absorbent flow control system is a caliber D n 65 linear regulator valve. There are pressure indicators between the outlet of the pump 9 and the tower system; the flow path between the absorbent from the outlet of the pump 9 to the absorption tower 6 has resistance components such as pipelines, check valves, stop valves, and elbows; and the front of the regulating valve 5 , There is no indication of the rear pressure, and there is an indication record of the flow rate, so the pressure drop ratio ΔP of the regulating valve 5 is determined R The value cannot be calibrated by measuring the pr...

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PUM

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Abstract

The invention discloses an on-line measurement method for the pressure drop ratio of an adjusting valve. The method comprises the following steps of: (1) obtaining a new standard working flow characteristic relation of the adjusting valve at different pressure drop ratios by taking a point with opening of h0 as a datum point according to the working flow characteristic functional expression of the adjusting valve, wherein h0 meets the requirement that h0 is more than 0 and less than 1.0; (2) selecting a measurement point h from a relative travel of the adjusting valve when the adjusting valve runs, wherein the measurement point h meets the requirement that h is more than 0 and less than 1.0 and is not equal to h0; obtaining the flow corresponding to the datum point and the flow corresponding to the measurement point; and further obtaining the working flow characteristic function value of the measurement point; and (3) in the new standard working flow characteristic relation, taking the working flow characteristic relation closest to the crossing point of the relative travel of the measurement point and the working flow characteristic function value of the measurement point as the target working flow characteristic relation, wherein the pressure drop ratio corresponding to the target working flow characteristic relation is the actual pressure drop ratio of the adjusting valve.

Description

technical field [0001] The present invention relates to regulating valve pressure drop ratio ΔP R A method by which the value is obtained online. Background technique [0002] According to the relevant professional knowledge of the regulating valve, at different pressure drop ratios ΔP R , the flow characteristics of the regulating valve are different. figure 1 , figure 2 Respectively show the two kinds of regulating valves in several common ΔP R The conventional flow characteristic curve (that is, the working flow characteristic curve) operated under the following formula (1): [0003] F ( h ) = Q h Q 1.0 = f ( h ) 1 ( 1 - Δ P ...

Claims

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Application Information

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IPC IPC(8): G01L13/00
Inventor 张玉润
Owner ZHEJIANG UNIV
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