Flow augmenting method of saturated and superheated steam

A technology of superheated steam and steam flow, applied in the field of saturated and superheated steam flow correction, can solve the problems of no unified standard for saturated and superheated steam flow calculation, no application of industrial steam flow correction, cumbersome calculation process, etc., to reduce data Store volume, scale up or down, apply simple effects

Active Publication Date: 2015-07-08
鞍钢集团工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As an actual gas, the flow calculation of steam is completely different from that of general gas and ideal gas. It is a very cumbersome and complicated calculation process to correct the steam flow measured by the flow monitoring device. Due to the huge amount of calculation data, in general control hard to implement
Generally, enterprises use the ideal gas equation to correct the superheated steam flow rate, but superheated steam is not an ideal gas, so it is obviously unreasonable to use the existing correction method
Especially for saturated and superheated steam with high temperature and pressure, the flow rate calculated by the current correction method has a large error
[0004] The density standard of IFC1967 superheated steam has been issued internationally, but it is limited to the level of industrial computers and has not been applied to the flow correction of industrial steam. At present, domestic enterprises do not have a unified standard for the calculation of saturated and superheated steam flow

Method used

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  • Flow augmenting method of saturated and superheated steam
  • Flow augmenting method of saturated and superheated steam
  • Flow augmenting method of saturated and superheated steam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The steam pressure is 0.15MPa, and the temperatures are 145°C, 162°C, 174°C, 185°C, 200°C, and 300°C. Look up Table 2 to get the pressure correction coefficient is 0.405, similarly you can get the temperature correction coefficient, see the table below:

[0071]

Embodiment 2

[0073] The steam pressure is 0.5MPa, and the temperatures are 145°C, 162°C, 174°C, 185°C, 200°C, and 300°C. Look up Table 2 to get the pressure correction coefficient is 1.00, similarly you can get the temperature correction coefficient, see the table below:

[0074]

Embodiment 3

[0076] The steam pressure is 0.75MPa, and the temperatures are 145°C, 162°C, 174°C, 185°C, 200°C, and 300°C. Look up Table 2 to get the pressure correction coefficient is 1.432, similarly you can get the temperature correction coefficient, see the table below:

[0077]

[0078] The error analysis of the above three sets of data can be obtained: the error Er=Ea / T×100%≈0.43% relative to the actual actual density value of the steam; the temperature and pressure correction accuracy of the steam flow is relatively high.

[0079] Note: The actual density value of steam is obtained by formulating IFC97 properties of water and water vapor from the International Association.

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Abstract

The invention relates to a flow augmenting method of saturated and superheated steam. The method comprises the following steps: 1) dividing the steam into a plurality of temperature intervals according to a common temperature range, wherein each temperature interval corresponds to a temperature augmenting factor r (T, P[0]) / r (T[0], P[0]); dividing the steam into a plurality of pressure intervals according to a common pressure range, wherein each pressure interval corresponds to a pressure augmenting factor r (T[0], P) / r (T[0], P[0]); 2) determining the temperature interval of the steam according to the temperature value of the practical steam, selecting the corresponding temperature augmenting factor, determining the pressure interval of the steam according to the pressure value of the practical steam, and selecting a corresponding pressure augmenting factor; calculating the augmented steam flow by using a formula: FORMULA. Compared with the prior art, the method provided by the invention has the beneficial effects: 1) an ideal gas equation density augmenting formula generally adopted by an existing steel enterprise can be completely replaced to greatly reduce the data storage amount and calculation amount, and is likely to be simply implemented to an industrial PLC (Programmable Logic Controller) or a DCS (Data Communication System) controller; 2) the steam measurement error can be reduced, and the steam metering precision can be improved.

Description

technical field [0001] The invention relates to the technical field of steam flow measurement and calculation, in particular to a method for correcting the flow of saturated and superheated steam. Background technique [0002] Energy measurement is an important indicator of national economic accounting and industrial production measurement. In the process of industrial production, steam is often used as a medium to realize technological processes such as power generation, heat preservation and heating, and heating. The accuracy of steam measurement is of great significance to the energy settlement, energy quality and industrial production process indicators at the factory level and between enterprises; on the one hand, in some process control processes, such as power plant boiler equipment, steam Flow is an important parameter directly involved in the control; on the other hand, users and energy production units often need to correct and check the amount of steam used or pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F15/04
Inventor 张英飞赵楠
Owner 鞍钢集团工程技术有限公司
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