Measuring device and method of hearth velocity field of combustion boiler by using acoustic method

Abstract

The invention discloses a measuring device and method for a hearth velocity field of a combustion boiler by using an acoustic method. 8 groups of acoustic wave transmitters (2) and acoustic wave receivers (3) are uniformly arranged on four walls of a same cross section of a hearth to form 24 interlaced acoustic wave transmission paths in a plane; a plurality of the acoustic wave transmitters (2) are respectively connected with the output end of a power amplifier (1) through an I / O (Input / Output) card (6) of a computer; the power supply ends of a plurality of the acoustic wave receivers (3) are respectively connected with the output end of a switching power supply (4); the signal output ends of the plurality of the acoustic wave receivers (3) are respectively connected with the computer (5) through an A / D (Analog to Digital) card (7); and the computer (5) is connected with a corresponding voice frequency input port of the power amplifier (1) through a D / A (Digital to Analog) card (8). The invention has the advantages of real-time and strong representation property to continuous fields; meanwhile, the technology has no requirements for measured flow field medium and environments, and the measuring device has the characteristics of small size, convenience for installation, low system cost and the like; and particularly, the invention has more advantages in detecting a hearth temperature field of a large coal-fired boiler in a power station.

Description

technical field [0001] The invention relates to monitoring equipment for the thermal operation of boilers, especially four-corner tangential circle boilers, in particular to a measuring device and a measuring method for the furnace velocity field of an acoustic combustion boiler. Background technique [0002] By 2020, my country's per capita installed capacity is expected to be about 0.6 kilowatts, reaching the current world average. The country's total installed capacity will reach about 950 million kilowatts, and the power generation will reach about 4.2 trillion kilowatt-hours. my country is a country where coal is the main primary energy source, and the dominant position of coal power in power generation is difficult to change in the short term. Calculated by power generation, coal-fired electricity in my country currently accounts for only 80%. In 2003, my country's coal output was 1.67 billion tons, accounting for 50% of the total coal output for power generation and ...

AI Technical Summary

Problems solved by technology

This method is heavy and difficult, and it is difficult to give the aerodynamic characteristics of the furnace without interference

In addition, there are also research attempts to measure the technology, mainly the hot wire anemometer method, using the hot wire anemometer and tracer method to measure the aerodynamic field in a W-shaped furnace under different working conditions; there are also attempts to use the laser Doppler method to measure the turbulent flow of the burner Field research, but there are major limitations

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