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Accurate steam flow metering compensating method

A technology of steam flow and compensation method, which is applied in the direction of volume change compensation/correction device, etc., which can solve the problems of error and random conversion of steam state without consideration, and achieve the effect of improving accuracy and eliminating compensation error

Inactive Publication Date: 2015-04-08
CHONGQING TUOZHAN AUTOMATION INSTR
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Problems solved by technology

[0012] In order to solve the problem that the steam flow metering compensation method in the prior art does not consider the random conversion of the steam state, and there may still be errors after compensation, the present invention proposes an accurate compensation method for steam flow metering

Method used

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  • Accurate steam flow metering compensating method

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Embodiment Construction

[0028] attached figure 1 It is a schematic diagram of the accurate compensation method for steam flow measurement of the present invention. It can be seen from the figure that the accurate compensation method for steam flow measurement of the present invention is provided with a temperature sensor and a pressure sensor at the metering point to measure the temperature and pressure of the steam at the metering point in real time; according to the measurement results Real-time judgment of steam temperature and pressure whether there is a corresponding relationship between temperature and pressure of saturated steam, if so, use saturated steam compensation method to determine real-time steam density ρ 2 , otherwise, use the superheated steam compensation method to determine the real-time steam density ρ 2 ;

[0029] The saturated steam compensation method adopts the following formula to determine the real-time steam density ρ 2 ,which is:

[0030] When the pressure P is 0.10~0....

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Abstract

The invention provides an accurate steam flow metering compensating method. By the accurate steam flow metering compensating method, the problems that random switching of states of steam is not considered in a steam flow metering compensating method in the prior art, and errors still exist possibly after compensation are solved. The accurate steam flow metering compensating method comprises the following steps of arranging a temperature sensor and a pressure sensor at a metering point; measuring the temperature and the pressure of steam at the metering point in real time; judging whether the temperature of the steam and the pressure of the steam have a corresponding relation or not in real time according to a measurement result; determining real-time steam density (rho2) by using a saturation steam compensating method if the temperature of the steam and the pressure of the steam have the corresponding relation; determining the real-time steam density (rho2) by using an over-hot steam compensating method if the temperature of the steam and the pressure of the steam do not have the corresponding relation; and calculating a steam flow metering value. The accurate steam flow metering compensating method has the advantages that the state of the steam can be judged in real time, compensation on the metering value is performed according to the state of the steam, compensation accuracy is improved, and compensation errors are eliminated.

Description

technical field [0001] The invention relates to a steam flow measurement compensation technology, in particular to an accurate compensation method for steam flow measurement. Background technique [0002] In the prior art, in the process of measuring saturated steam or superheated steam, the measurement value must be compensated, and the following formula (1) is used for calculation: [0003] M = M max × I - 4 16 × ρ 2 ρ 1 - - - ( 1 ) [0004] In the formula: M is the flow rate after compensation, unit kg / h; M max It is the engineering value of full-scale flow, unit: kg / h; It is the percentage of the flow rate before c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F15/02
Inventor 项家从
Owner CHONGQING TUOZHAN AUTOMATION INSTR
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