Flame water cooling method and water cooling boiler system

Abstract

The invention discloses a flame water cooling method and a water cooling boiler system. The system comprises a fuel gas / fuel oil burner, a fire tube heat exchanger, a boiler drum and a boiler, fuel gas / fuel oil and air enter the fuel gas / fuel oil burner to be ignited, generated flames enter the fire tube heat exchanger to be continuously combusted after being ignited, heat exchange is carried out between the flames and circulating water in the fire tube heat exchanger, and part of heat generated by combustion is absorbed, so that the flame temperature in the fire tube heat exchanger is lower than the thermal NOx generation temperature. The flames leave a water-cooling round tube and then enter a hearth for continuous combustion, part of heat is absorbed by the fire tube heat exchanger after the flames leave the water-cooled fire tube heat exchanger, the flame temperature is also lower than the thermal NOx generation temperature, and the generated NOx value is very low. As the temperature difference between the flames and the fire tube heat exchanger is large and the heat transfer efficiency of the flames and the fire tube heat exchanger is high, after water circulation is connected into the boiler system, the heating surface can be reduced, the steel consumption of the boiler is reduced, the cost is reduced, and the using effect is good.

Description

technical field [0001] The invention relates to a water-cooled boiler system and method, in particular to a flame water-cooled method and a water-cooled boiler system suitable for the technical field of heat exchangers and boiler water circulation. Background technique [0002] A large part of the nitrogen oxides produced by oil / gas burners is thermal NOx (nitrogen oxide compounds). Thermal NOx is formed by oxidation of nitrogen in the air under high temperature conditions, and the amount of formation depends mainly on the temperature. and the time the flue gas stays in the high temperature zone. Tests have shown that under the same conditions, the amount of NOx produced increases with the increase of temperature. When the temperature is lower than 1500 ° C, almost no thermal NOx is produced. Proportional to time. Therefore, from the perspective of the formation mechanism of thermal NOx, it is important to rationally organize the combustion of the burner, avoid the high-te...

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Problems solved by technology

[0004] Technical problem: the purpose of the present invention is to overcome the deficiencies in the existing prior art, to provide a flame water cooling method and water-cooled boiler system, to solve the problem of excessive NOx formed by too high temperature in the combustion process, and to solve Complexity of water cycle, reduced boiler cost

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