Boiler close-to-wall air device and method based on burner near-wall atmosphere soft measurement

Abstract

The invention relates to a boiler close-to-wall air device based on burner near-wall atmosphere soft measurement. The boiler close-to-wall air device comprises close-to-wall air nozzles, near-wall atmosphere sampling pipes, a burner and a hearth, 2-5 layers of close-to-wall air nozzles are arranged on the front wall and the rear wall near the burner and at the bottom of the hearth, and the near-wall atmosphere sampling pipes are arranged on the side wall of the hearth; the near-wall atmosphere sampling pipes are installed on the left side wall and the right side wall of the hearth, and the height of the near-wall atmosphere sampling pipes is located on the upper middle portion of a burner area; the near-wall atmosphere sampling pipes are made of heat-resistant stainless steel and are mounted on water cooling wall fins; the pipe diameter of the near-wall atmosphere sampling pipes is 10-20 mm, and 2-4 layers of near-wall atmosphere sampling pipes are arranged in total; and the near-wall atmosphere sampling pipes are connected with a flue gas analyzer. The boiler close-to-wall air device has the beneficial effects that the whole system is simple and reasonable in structure, only the the close-to-wall air nozzles and a small number of wall surface sampling test pipes need to be additionally arranged, transformation implementation is facilitated, and the technical benefit and the economic benefit are remarkable.

Description

technical field [0001] The invention relates to the technical field of boiler combustion, in particular to a boiler wall-attached wind device and method based on the soft measurement of the atmosphere near the wall surface of the burner. Background technique [0002] my country's thermal power generation usually uses coal as the main fuel, but because the sulfur content in power coal is generally too high, high-temperature corrosion often occurs on the heating surface of the boiler in the thermal power plant. With the continuous development of high-parameter, large-capacity, and environmentally-friendly boilers in power plants, the problem of high-temperature corrosion of boiler heating surface tubes has become more prominent, which is an important reason for unplanned outages of thermal power units and has become a key issue affecting the safe operation of thermal power plants. much attention. According to relevant statistics, since the discovery of high-temperature corros...

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Problems solved by technology

However, the above method still has limitations: (1) The near-wall atmosphere real-time monitoring system has complex equipment and large investment. For example, a set of near-wall atmosphere real-time monitoring system with more than ten measuring points costs more than two million yuan

(2) The sampling and measuring point is located in the area where the boiler burns most intensely and has the highest temperature, and the high-temperature flue gas contains sulfur dioxide, high-concentration water vapor, and a large amount of fine ash particles, which can easily cause problems such as pipeline blockage and measurement element damage, and it is difficult to conduct long-term normal operation

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