Power station boiler tail flue rectangular section flue gas measuring device

Abstract

A power station boiler tail flue rectangular section flues gas measuring device comprises multi-pipe type multifunctional sampling guns, a float flowmeter and a flue gas analyzer. The output ends of the multifunctional sampling guns are connected with the float flowmeter through a flue gas pipeline and then connected with the flue gas analyzer through a flow control switch of the float flowmeter. The multi-pipe type multifunctional sampling guns of the same size are mounted at all testing points according to the rectangular section size before tests, and each sampling steel pipe is connected with a corresponding float flowmeter through a hose. Each float flowmeter outlet is connected to the flue gas analyzer through a tee joint and a hose, and single-channel multi-unit synchronous equal-flow instantaneous measurement is achieved. The measuring device is mounted in advance, therefore, the work intensity during measurement can be greatly reduced, multi-point equal-flow synchronous measurement is achieved, and measurement precision is improved. Especially, inlet and outlet total-section synchronous measurement of air preheater air leakage measurement is really achieved, and reference bases are provided for energy saving and emission reducing of a power plant.

Description

technical field [0001] The invention relates to a flue gas measuring device with a rectangular cross-section of a tail flue of a power plant boiler, which belongs to the technical field of boiler flue gas sampling and measurement. Background technique [0002] In the combustion process of power plant boilers, combustion in the furnace is an important indicator of boiler control. Oxygen, carbon monoxide, carbon dioxide, nitrogen oxides, and sulfur dioxide produced in the flue gas during the combustion process are important monitoring data, especially for boiler efficiency calculations, air Accurate flue gas composition is required for the calculation of preheater air leakage rate and emission value. In addition to environmental protection requirements, how to accurately measure and control the composition of flue gas is an important basis for energy saving and emission reduction in thermal power plants. [0003] At present, my country's national standard GB-10184-88 and indu...

AI Technical Summary

Problems solved by technology

This method requires manual sampling of multiple measuring points at different depths in sequence. The flue of a large unit is large and there are many measuring points. It takes a long time to use a grid method, and the data must be weighted and averaged. It requires a long time for the unit to stabilize, and the collected data is completed within a Δt time rather than an instantaneous value, which is less representative

This measurement method is labor-intensive and time-consuming for the measurement personnel, and the measured data is obtained by sequentially sampling each point on the grid within Δt, and it cannot realize instantaneous sampling of all network points at the same time. Large volume, inconvenient operation, etc., seriously affect the measurement accuracy, and the representativeness is poor

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