Saturated steam catalytic burner used for cement decomposition furnace

Abstract

The invention discloses a saturated steam catalytic burner used for a cement decomposition furnace. The burner comprises an inner sleeve, a saturated steam channel, a catalyst tank, a conical chamfer and cyclone wind wings; the catalyst tank is connected with the saturated steam channel which is connected with the inner sleeve; and the outlet end of the inner sleeve is provided with the conical chamfer and the cyclone wind wings; saturated steam enters the saturated steam channel through the catalyst tank; coal air enters the inner sleeve from the inlet end of the inner sleeve, after the coal air is mixed with the saturated steam coming from the saturated steam channel at the variable-diameter position of the inner sleeve, the diffusion degree of coal powder is increased through the conical chamfer; meanwhile, by means of the cyclone wind wings, the coal powder and the saturated steam rotationally enter the decomposition furnace; and a backflow area is formed at the end portion of a coal pipe, and the purpose of generating CO and H2 is achieved. The saturated steam catalytic burner reduces the generation amount of fuel type nitrogen oxides, reduction components generated after the saturated steam is added can reduce more generated NOx, and the sewage charge and the running cost of a whole cement factory are reduced.

Description

technical field [0001] The invention relates to the field of environmental protection engineering, in particular to a saturated steam catalytic burner, in particular to a saturated steam catalytic burner used in a cement decomposition furnace. Background technique [0002] At present, the design volume of early calciners in cement plants is generally small, and in order to control production costs, enterprises have to use cheaper low-quality bituminous coal or anthracite, resulting in incomplete combustion of coal powder; and the burners currently used are all in When the excess air coefficient (that is, the ratio of the actual air supplied to the theoretical air during fuel combustion) is greater than 1, the combustion of pulverized coal and the heating and decomposition of raw materials are carried out. What's more, the kiln tail still uses the traditional three channel burner (using the primary fan at the kiln tail for air supply), and the CaCO in the calciner 3 The deco...

AI Technical Summary

Problems solved by technology

[0002] At present, the design volume of early calciners in cement plants is generally small, and in order to control production costs, enterprises have to use cheaper low-quality bituminous coal or anthracite, resulting in incomplete combustion of coal powder; and the burners currently used are all in When the excess air coefficient (that is, the ratio of the actual air supplied to the theoretical air during fuel combustion) is greater than 1, the combustion of pulverized coal and the heating and decomposition of raw materials are carried out. What’s more, the kiln tail still uses the traditional three channel burner (using the primary fan at the kiln tail for air supply), and the CaCO in the calciner 3 The decomposition temperature ranges from 825 to 900°C. It does not need to generate local high temperature like kiln head burners. Once local high temperature is generated, it will cause skinning in the system and waste heat, increase coal consumption, and generate a large amount of NOx, increasing Increased the sewage charges of the cement plant, but also increased the operating cost of the entire cement plant

[0003] At present, some domestic cement plant calciner burners have removed the primary fan at the kiln tail, but only use swirling air fins at the outlet of the burner nozzle to forcibly change the swirling direction of the coal air to achieve the purpose of more fully mixing the coal air. There are the following problems: First, adding "swirl air fins" in the front section of the burner will increase the resistance of the coal air outlet, so that the coal air volume cannot be continuously and stably injected into the calciner, and the service life of the swirl air fins is short and wears out quickly. When worn out or worn seriously, the swirling effect will be worse, and the coal mixing effect will drop significantly

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