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Soft measurement method of main steam flow in unit power plant boiler

A technology for main steam flow and power station boilers, applied in the field of measurement, can solve problems such as application scope limitation, achieve the effects of convenient implementation, increased throttling loss, and fast dynamic response speed

Inactive Publication Date: 2015-08-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The disadvantage of this method is that it is only applicable to the situation where the steam turbine has a speed regulating stage, and its application range is greatly limited

Method used

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  • Soft measurement method of main steam flow in unit power plant boiler

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Embodiment Construction

[0036] The structure of the main steam pipeline connecting the boiler and the steam turbine of the thermal power generation unit includes two types, one is that the pipelines on the A and B sides of the boiler outlet are not merged, and the two pipelines are directly connected to the steam turbine; the other is that the boiler outlet is on the A and B sides The two pipes are merged into one pipe on the boiler side and connected to the steam turbine side, and then divided into two pipes on the A and B sides to connect to the steam turbine. In order to improve the reliability, the thermal power generation unit is equipped with multiple redundant main steam temperature and pressure measuring points. The temperature and pressure measuring points are respectively installed in the boiler outlet A and B side pipelines to measure the boiler outlet steam temperature and pressure. Temperature and pressure measuring points are respectively installed in the pipelines on the A and B sides t...

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Abstract

The invention discloses a soft measuring method for main steam flow of a unit system utility boiler. The soft measuring method comprises the following steps of: detecting a pressure and a temperature of steam at a boiler outlet, and the pressure and the temperature of the steam at a steam turbine inlet in real time, and utilizing a formula to calculate flow mass qms (kg / s) of the steam, wherein K denotes an area flow coefficient (m<2>); rho denotes density of the steam in the pipeline (Kg / m<3>); pB denotes the pressure of the steam of the boiler outlet (Pa); pT denotes the pressure of the steam of the steam turbine inlet (Pa); H denotes a height difference (m) between a steam pressure measuring point at the boiler outlet and a steam pressure measuring point at the steam turbine inlet; and g denotes an acceleration of gravity (m / s<2>). The soft measuring method disclosed by the invention has a simple calculation process, has high static accuracy, has a rapid dynamic response speed, achieves a reliable calculation result, does not increase throttling loss, and is applicable to measuring of the main steam flow of various unit system utility boilers.

Description

technical field [0001] The invention relates to a method for conveniently, quickly and accurately measuring the main steam flow rate of a power plant boiler, which belongs to the field of measurement technology. Background technique [0002] The main steam flow rate is an important parameter to measure the load of the power plant boiler, and it plays an important role in the monitoring of the boiler operating status and the control of process parameters. At present, all large-scale thermal power generation units are unit units, that is, one boiler corresponds to one steam turbine and one generator. The known methods for measuring the main steam flow of power plant boilers mainly include the following: [0003] 1. Measure the main steam flow through the standard throttling device installed on the main steam pipeline of the boiler. The measurement accuracy is very high, but it will cause a relatively large throttling loss. [0004] 2. By measuring the pressure and temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/86
Inventor 刘鑫屏田亮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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