Smoke waste heat recovery and re-circulating temperature adjusting method and system of natural gas oxygen-rich combustion furnace

Abstract

The invention discloses a smoke waste heat recovery and re-circulating temperature adjusting method and system of a natural gas oxygen-rich combustion furnace. The method comprises the following steps: enabling one part of smoke discharged from a hearth of the natural gas oxygen-rich combustion furnace to enter a re-circulating flue, treating the smoke by utilizing a circulating fan and an electric dust collector arranged in the re-circulating flue, then returning the smoke to the hearth, cooling the hearth, repeating the process, and completing the temperature adjustment in the hearth; and enabling the remaining smoke discharged from the hearth of the natural gas oxygen-rich combustion furnace to enter a metal radiation heat exchanger to exchange heat with a combustion-supporting oxygen-rich gas, recycling the waste heat of the smoke, and discharging the heat-exchanged smoke from a chimney. By means of re-circulating way of the smoke and heat exchanging by the metal radiation heat exchanger, the temperature in the hearth of an industrial kiln and a boiler when in oxygen-rich combustion can be effectively controlled, the excessive oxidation or burning of furnace burden and overheating and damage of a furnace body can be avoided, and the recycling of the waste heat of the discharged smoke can be realized.

Description

technical field [0001] The invention relates to the field of natural gas oxygen-enriched combustion furnaces, in particular to a method and system for recovering waste heat and recirculating temperature regulation of oxygen-enriched combustion flue gas of natural gas industrial kilns and boilers. Background technique [0002] Oxygen-enriched combustion refers to the combustion of oxygen-enriched air with a higher oxygen concentration than air (21% oxygen content). It is a highly efficient and energy-saving combustion technology, and has applications in the glass industry, metallurgical industry and thermal engineering fields. Oxygen-enriched combustion technology can improve the combustion efficiency of natural gas and reduce the cost of natural gas relatively. As the price of natural gas continues to increase, saving gas is a key way to reduce production costs, and the development of natural gas oxygen-enriched combustion technology is one of the key technologies for natura...

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Problems solved by technology

[0006] Based on the problems existing in the above-mentioned prior art, the present invention provides a flue gas waste heat recovery and recirculation temperature adjustment system of a natural gas oxygen-enriched combustion furnace, which can control the temperature in the furnace of industrial kilns and boilers through flue gas recirculation and Recover the heat in the flue gas, solve the problems of industrial kilns and boilers that are difficult to control due to the high temperature of the natural gas oxygen-enriched combustion, resulting in the oxidation or burnout of the furnace material, damage to the furnace body and energy waste caused by excessive exhaust gas temperature

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