Measuring method and system for of hearth radiation hot flow distribution

Abstract

The invention relates to a measuring method and system for hearth radiation hot flow distribution. The measuring system and method can detect the radiation hot flows on multiple heights along the hearth, and are especially applicable to measure the distribution of the radiation hot flow along the height of the hearth. The measuring system comprises a water cooling wall pipe used as a measurement sensing pipe; a three-way valve is arranged at the bottom part of the water cooling wall pipe to connect with a water feeding pipeline of a self-inspective coal device at an inlet and a pipeline of a lower header of the water cooling wall respectively; meanwhile, a certain quantity of thermoelectric couples are arranged on the water cooling wall pipe for measuring the temperature of mediums in thepipe; the sensing pipe is separated into several pipe sections by the thermoelectric couples; the radiation hot flow on each pipe section is obtained according to the changes of the medium enthalpy of the pipe section; under the normal running state, the cooling medium in the measurement sensing pipe comes from the lower leader of the water cold wall; under the measuring state, the cooling mediumcomes from the inlet of the self-inspective coal device. Any form of heat flow meter is needed to install; the measuring process has less impact on the water cold wall pipe, the structure is simple, and the measurement is easy to realize; furthermore, the labor force and the material resources are saved.

Description

technical field [0001] The invention belongs to the field of thermal power engineering of power plants, and relates to a method and system for measuring the distribution of radiant heat flow in a furnace, and is particularly suitable for measuring the radiant heat flow at multiple positions at different heights of the furnace, so as to obtain the distribution of the radiant heat flow along the height of the furnace. Background technique [0002] Due to the large furnace volume of power plant boilers, the uneven distribution of fuel combustion and the drastic temperature changes of the flue gas along the process, the local heat flow in certain areas in the furnace sometimes reaches several times the average heat flow. The evaporation tubes in these high heat flow areas are Weaknesses in safe operation. When designing a boiler furnace, the maximum tube wall temperature of the evaporation tube is usually checked based on the empirical distribution of radiant heat flow, and the ...

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Problems solved by technology

[0003] At present, when studying the distribution law of radiant heat flow in the furnace, it is necessary to arrange a large number of heat flow measuring points at different heights in the furnace; due to the large volume of the boiler furnace, the number of radiant heat flow meters required is sometimes as many as dozens, and more ones are used. This radiant heat flow meter is usually equipped with a water cooling system, which obtains the value of the radiant heat flow by measuring the temperature change of the metal on the heat flow direction. The disadvantage of this method is that the thermocouple is in a high-temperature and dusty environment, and the system reliability is poor. heavy workload

Chinese patent 200910085715.0 discloses the above-mentioned radiant heat flow meter equipped with a cooling system; other types of radiant heat flow meters also include: a detector based on the change of resistance of materials under the condition of radiant heat flow announced by Chinese patent 98814340.2; and China Patent No. 200410091166.5 discloses a thermal diffusion heat flowmeter based on fluid temperature and flow measurement suitable for residential heat flow measurement. When measuring the distribution of furnace radiation heat flow, no matter what type of heat flow meter is used, it needs to be different in the furnace. A large number of heat flow measurement points are arranged on the height, the measurement cost is high, and a lot of manpower is consumed

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