Measuring method for temperature of supercritical once-through boiler membrane wall

A membrane-type water-cooled wall and once-through boiler technology, which is applied to thermometers, measuring devices, and heat measurement, to achieve the effects of reducing operating costs, prolonging service life, and avoiding pipe bursts

Inactive Publication Date: 2007-09-12
NORTHEAST POWER SCI RES INSTITUTION
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AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: the present invention provides a method for measuring the temperature of the membrane water wall of a supercritical once-through boiler. The coefficient is estimated, which cannot truly and accurately reflect the problems existing in the boiler water wall temperature and other aspects.

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  • Measuring method for temperature of supercritical once-through boiler membrane wall

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Embodiment 1

[0020] As shown in accompanying drawing 1, the present invention is a kind of measuring method of membrane type water wall temperature of supercritical once-through boiler, and this method is as follows: 1. measure and calculate the stress of the water wall tube that will measure temperature, according to the result obtained in water cooling Select the opening point on the wall tube; ② Open a hole with a diameter of φ1.1mm and an outer edge of φ2mm on the water-cooled wall tube that has measured the opening point; ③ Insert a temperature measuring thermocouple with a diameter of φ1mm in the opened hole , Measure the wall temperature of the water-cooled wall tube to the fire side through the temperature measuring thermocouple. In the figure, L=1.1, L1=9.5, a=45.

[0021] The above-mentioned measurement methods are as follows: ①Using the finite element method to compare the stress calculation of the water-cooled wall to be measured with the hole and without opening the hole to se...

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Abstract

This invention relates to a temperature measuring means of hypercritical monotube boiler membrane water-cold wall. The method as follows: (1) measure and count the stress of water-cold wall, according to outcome to select tapping point on water-cold wall;(2)at the tapping point of water-cold wall, at transverse direction open hole of diameter 1.1 mm and external margin 2 mm;(3) Greet thermometric couple in the hole, via it to measure water-cold wall's temperature of fire side. The advantage: (1) thermo couple measuring end directly contact wall of fire side, can measure pipe surface temperature of fire side truly. (2) for the thermocouple lay interior of open pore, avoid directly accept furnace inside high temperature radiation, abrasion and erode and so on badness impact, widely prolong service life generally for several years upwards;(3) if thermocouple deformed, the change will be easy;(4) avoid bursting of a tube, reduce possibility of trouble, cut down operating cost.

Description

technical field [0001] The invention relates to a method for measuring the temperature of a water-cooled wall, in particular to a method for measuring the temperature of a membrane-type water-cooled wall of a once-through boiler. Background technique [0002] For a supercritical once-through boiler, when the pressure of the working fluid exceeds the critical value of 22.2MPa and the temperature is around 375°C, the constant pressure specific heat Cp of water has a maximum value, as shown in Figure 1. At this time, the maximum specific heat ratio is higher than that in other states The specific heat is much larger, so it is called the large specific heat region. The large specific heat area is generally located on the heating surface of the water-cooled wall of the boiler. In the large specific heat area, the specific heat, specific volume, thermal conductivity, and dynamic viscosity of the working fluid at constant pressure change sharply, especially the large change in spec...

Claims

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Application Information

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IPC IPC(8): G01K7/02
Inventor 邹天舒冷杰吴景兴王力蒋翀潘晶韩志华刘学增苏东吴炬张幼明梁明文
Owner NORTHEAST POWER SCI RES INSTITUTION
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