Low-nitrogen condensation wall-mounted furnace and application method thereof

Abstract

The invention discloses a low-nitrogen condensation wall-mounted furnace and an application method thereof. The low-nitrogen condensation wall-mounted furnace comprises a draught fan, a fume collecting hood, a gas valve and a water-cooling combustor. An inner cavity of a gas distributing pipe of the water-cooling combustor is divided into two independent sections through a block plate, and each section is connected with a gas inlet joint. The gas valve is composed of a main on-off valve, a proportion regulating valve and two on-off valves, the main on-off valve is connected with a main gas inlet pipe, and outlets of the two on-off valves communicate with the two sections of the gas distributing pipe separately. The gas distributing pipe is sectioned, all fire rows or a part of fire rows on the gas distributing pipe are controlled to combust, small duty ratio is reduced, and the problems of flameout and too hot water temperature in summer can be solved. In addition, the constant-speed draught fan is adopted for the wall-mounted furnace, so the problem of corrosion of condensate water to a main heat exchanger can be solved. A ventilation baffle is further arranged at the bottom of the fume collecting hood to solve the problem of excessive CO emission under limit gas test conditions. Through experimental verification, when the small load regulation ratio of the wall-mounted furnace is between 0.35-0.5, the problems of flameout and too hot water temperature in summer can be solved.

Description

technical field [0001] The invention relates to a condensing wall-hung boiler, in particular to a low-nitrogen condensing wall-hung boiler and an application method thereof. Background technique [0002] Commonly used wall-hung boilers include gas heating water heaters and condensing gas heating bath dual-purpose furnaces. At present, there are mainly three kinds of burners: fully premixed burner, rich-lean burner and water-cooled coil burner. The rich-thin burner is rarely used in wall-hung furnaces, and it borrows the harmonica structural burner of the wall-hung furnace, which is only suitable for positive pressure combustion environments. The fully premixed burner has high technical content and has high requirements on the composition content and cleanliness of the gas, so its combustion adaptability is weak. At present, water-cooled burners are better used in wall-hung boilers. Using this burner, the content of nitrogen oxides can be effectively reduced after combustio...

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Problems solved by technology

However, the application of this burner also has the following defects: condensed water corrodes the main heat exchanger; the adjustment ratio of the combustion load is too small to cause the water temperature to be too hot in summer; under the limit gas test conditions, the CO gas in the flue gas exceeds the standard

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