Energy-saving and environment-friendly combustion system using flue gas for supporting combustion for industrial furnace

Abstract

The invention discloses an energy-saving and environment-friendly combustion system using flue gas for supporting combustion for an industrial furnace. The energy-saving and environment-friendly combustion system comprises a furnace body, a combustor and a heat exchanger, wherein the furnace body is provided with a first flue and a second flue; the combustor is provided with a first inlet and a second inlet; the heat exchanger is provided with a high-temperature flue gas inlet, a cold air inlet, a low-temperature flue gas inlet and a hot air inlet, the high-temperature flue gas inlet is connected with the first flue, the low-temperature flue gas inlet is connected with a chimney, the cold air inlet is connected with a first fan, the hot air inlet is connected with the first inlet of the combustor, and the second flue is connected with the second inlet; and the combustor comprises a central pipe, an inner barrel arranged outside the central pipe in a sleeving manner, an outer barrel arranged outside the inner barrel in a sleeving manner, and a circular-table-shaped mixing cavity connected between the outer barrel and the furnace body, the first inlet communicates with a first annular space formed between the outer wall of the central pipe and the inner wall of the inner barrel, and the second inlet communicates with a second annular space formed between the outer wall of the inner barrel and the inner wall of the outer barrel.

Description

technical field [0001] The invention relates to the technical field of energy conservation and environmental protection, in particular to an energy conservation and environmental protection combustion system capable of improving combustion efficiency and reducing nitrogen oxide emissions. Background technique [0002] At present, with the development of industry, energy prices continue to rise, and environmental pollution continues to intensify. The environmental protection departments of various countries in the world have strict requirements on the emission standards of industrial boilers / kilns. Existing boilers and kilns are an important part of modern industry, which can provide good combustion conditions in order to maximize the release of the chemical energy of the fuel and convert it into heat energy. Boilers and kilns emit a large amount of flue gas when they are working, and these flue gases with high heat energy are directly discharged into the atmosphere, which no...

AI Technical Summary

Problems solved by technology

Although reducing the oxygen concentration in the combustion zone is beneficial to reduce NO x emissions, but often also affects combustion efficiency

The existing flue gas recirculation combustion technology (such as Chinese patent publications CN1844817A and CN1360192A, etc.) can reduce the oxygen concentration in the combustion area due to the recycling of part of the flue gas, but the circulating flue gas of this technology is taken from the exhaust flue, and its temperature is higher than The temperature of the combustion flue gas in the furnace is much lower. Sending the low-temperature circulating flue gas into the combustion area will reduce the temperature in this area, thereby affecting the combustion efficiency of the burner

[0006] In addition, the industry mainly uses reducing agents (ammonia, urea, alkanes, etc.) to react with nitrogen oxides to neutralize nitrogen oxides. The main processes are selective catalytic reduction (SCR) and selective non-catalytic reduction ( SNCR), etc., ammonia and nitrogen oxides react to generate nitrogen and water, so as to achieve pollution-free discharge, but the treatment process is complicated to operate and the operating cost is too high

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