Low-emission cold flame multistage premixed combustor

Abstract

The invention provides a low-emission cold flame multistage premixed combustor. The low-emission cold flame multistage premixed combustor comprises an ignition gun and a gas injection pipe. The gas injection pipe is provided with three gas injection outlets, and staged combustion is conducted through combustion areas. A premixed flame is injected at a high speed from the gas injection outlets and rapidly makes contact with a heat transfer pipe, the temperature of the flame is rapidly lowered, and the flame making contact with a refrigerant is reflected back to form a combustion gas curtain, so that combusted waste gas participates in secondary combustion and serves as flue gas to be recycled, and generation of nitrogen oxides is effectively reduced. Through a unique Venturi premixed structure, air and fuel are mixed more sufficiently. By means of the ignition gun which is high in adjusting ratio and wide in air excess coefficient range, the effect that the flame can be successfully built is ensured.

Description

technical field [0001] The invention relates to a burner, in particular to a low-emission cold-flame multi-stage premix burner for a boiler. Background technique [0002] With the rapid development of industry, environmental pollution has become increasingly serious, and the development and research of high-efficiency and low-pollution combustion technology and products have become increasingly important. [0003] Low-pollution combustion is the control of nitrogen oxides (NO X ) emissions, NO X The formation of the gas is mainly related to the temperature of the combustion flame, the concentration of oxygen in the combustion gas, the residence time of the combustion gas at high temperature and the oxygen content in the fuel. [0004] Existing boiler burners use metal fibers as combustion tubes to burn premixed gas on the metal surface. In order to achieve low emissions, the excess air usually needs to be controlled at about 40%, and the efficiency of surface combustion is...

AI Technical Summary

Problems solved by technology

However, the use of flue gas recirculation requires additional pipelines, and the space is insufficient. If the distance between the flue gas and the inlet of the combustion-supporting fan is long, the temperature of the exhaust gas is too high, which is not practical. The temperature is low in winter, and condensed water will be generated, which increases the difficulty of maintenance.

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