Measuring method and device for steam flow of boiler

Abstract

The invention provides a measuring device for a steam flow of a boiler. The measuring device comprises a water supply quantity measuring module, a water storage increment measuring module, a sewage water quantity measuring module and a steam flow measuring module, wherein the water supply quantity measuring module is used for measuring water supply quantity W of the boiler; the water storage increment measuring module is used for measuring water storage increment of a steam drum of the boiler, wherein a formula of the water storage increment is shown in the specification, k1=rho water*S steam drum water level, and dH / dt is water level increment of the steam drum in a unit time; the sewage water quantity measuring module is used for measuring sewage water quantity k2*Fn of the boiler, wherein k2 is a sewage water conversion coefficient of the boiler and Fn is opening of a boiler blow down valve; the steam flow measuring module is connected with the water supply quantity measuring module, the water storage increment measuring module and the sewage water quantity measuring module for calculating steam flow of the steam drum of the boiler. According to the measuring device, the evaporation capacity of water is acquired through flow of liquid-state supplied water, a pure hysteresis phenomenon does not exist, temperature compensation and pressure compensation are not required, the accuracy for measurement of the steam flow is high, and high-efficiency and energy-saving control of the boiler is realized by accurately measuring the evaporation capacity of water in the boiler.

Description

technical field [0001] The invention relates to the technical field of flow measurement, in particular to a method and device for measuring boiler steam flow. Background technique [0002] At present, there are hundreds of thousands of steam boilers in our country, whose automation level is generally very low and consumes a lot of coal. [0003] Such as figure 1 As shown, it is a schematic diagram of the working principle of the steam boiler in the prior art. During the working process, the boiler is generally controlled by the feed water flow meter W, the steam drum liquid level meter H, and the main steam flow meter D to achieve safety, stable production, The purpose of high production and low consumption. [0004] There are at least the following technical defects in the control process of steam boilers in the prior art: (1) Various existing instruments cannot measure the evaporation of water inside the bubble bag (that is, the evaporation of water inside the boiler), b...

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Problems solved by technology

[0004] There are at least the following technical defects in the control process of steam boilers in the prior art: (1) Various existing instruments cannot measure the evaporation of water inside the bubble bag (that is, the evaporation of water inside the boiler), but can only measure the steam in the bubble bag The steam flow behind the outlet also needs to be compensated for temperature and pressure, and its pure lag time is long and the accuracy is low; (2) the use of special steam flow measurement instruments requires high equipment investment and maintenance costs; (3) due to the inability to quickly Measure the water evaporation accurately, so the optimal control system cannot achieve the goal of optimal combustion

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