A realization of no x Flameless combustion heating boiler system with near zero emissions

Abstract

The invention belongs to the field of combustion devices, and particularly discloses a flameless combustion heating boiler system for realizing near-zero emission of NOx. The system is characterized in that an air supply device is connected with a flameless combustor, a first standing vortex combustion chamber and a second standing vortex combustion chamber in the flameless combustor are symmetrically distributed about the central axis of a heat preservation hearth and are used for carrying out flame combustion so as to generate rich fuel flue gas, an outlet of an air direct spraying spray pipe is connected with the heat preservation hearth and is used for providing air for carrying rich fuel flue gas to the heat preservation hearth, the rich fuel flue gas and the air are subjected to flameless combustion in the heat preservation hearth, the generated flue gas enters a flue gas heat exchange device, and the circulating water for heating is heated in a heat transfer mode. According to system, the non-switching flameless combustor is designed, due to the fact that the temperature of the fuel-rich flue gas is higher than an ignition point of the fuel, flameless combustion can be directly carried out without preheating, and meanwhile, flameless combustion is applied to the heating boiler, so that the temperature of the heat preservation hearth can be ensured to reach the temperature condition of flameless combustion quickly.

Description

technical field [0001] The invention belongs to the field of combustion devices, and more specifically relates to a method for realizing NO x Flameless combustion heating boiler system with near zero emissions. Background technique [0002] The increasingly serious problem of air pollution has forced all parts of the country to implement stricter pollutant emission standards, so the realization of clean combustion technology has become particularly important at this stage. Among them, the flameless combustion technology uses high-speed jets to make the flame front disappear, which can reduce the overall temperature in the furnace, and at the same time reduce the oxygen concentration in the furnace, and finally reduce NO x emission. Simultaneously low NO due to flameless combustion x It is a clean combustion technology with great development prospects. [0003] Flameless combustion has been successfully applied to steel and metallurgical industries, but it has not been su...

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Problems solved by technology

[0004] CN101285576B discloses a low-calorific-value fuel high-temperature air combustion system, which can fully burn low-calorific fuel, and can recycle high-temperature air to improve the thermal energy utilization efficiency of industrial furnaces. However, the switching process of the system is complicated, which is not conducive to practical application. to promote

CN104990078B discloses a burner capable of quickly realizing flameless combustion. This burner can be operated at rated power, thereby greatly improving the efficiency of preheating the furnace, reducing the preheating time, and making the process of switching to the flameless combustion mode , the safety performance is improved, but in the process of switching from flaming combustion to flameless combustion, due to the cessation of flaming combustion and the injection of high-speed jets, there is still a danger of flame extinguishing, and this patent is not designed for heating boilers of

CN108506929A discloses a fuel oil flameless combustion device and its system equipment, but in terms of actual operation, before reaching the flameless combustion of fuel oil, the furnace still needs to be heated by an external heat source so that the temperature of the furnace chamber reaches above the ignition point of the fuel oil. In this process, there may still be problems such as flameout and combustion instability caused by the switching process.

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