Reasonable-structure type gas boiler efficient low-NOx combustion system

Abstract

The invention relates to a reasonable-structure type gas boiler efficient low-NOx combustion system. The system comprises a hearth, multiple gas combustors which can be arranged as needed, and secondary air spraying openings which are limited and fixed with the set deflection angle and are arranged at the positions, on the downstream parts of the set positions of the gas combustors, of a furnace wall in a layered manner with several secondary air spraying openings forming a set. By means of the secondary air spraying openings which are arranged in the layered manner, secondary air can be sentin in a layered classified manner; and due to all the layers of secondary air spraying openings which are fixedly arranged with the set deflection angle, combustion supporting air can automatically steer after being emitted into the hearth and being hindered to form disturbance rotational flow air fleeing and rotating in combustion flue gas flow around the center of the hearth. The acting processof the secondary air is prolonged, the burnout degree of fuel, the fullness of flames in the hearth and the overall combustion efficiency of a boiler are ensured, the overall dense-lean combustion atmosphere capable of effectively inhibiting the generation amount of NOx, reducing the generated NOx and better sufficiently achieving the secondary air low-nitrogen combustion technical effect is constructed, the initial discharging condensation of NOx of the gas boiler is obviously reduced, and the increasingly strict environmental protection standard requirement is met.

Description

technical field [0001] The invention relates to the technical field of ultra-low-nitrogen combustion of gas-fired boilers, in particular to a highly efficient and low-NOx combustion system of a gas-fired boiler with reasonable structure, which has the functions of enhancing the overall rich-lean combustion effect and significantly suppressing the amount of NOx generated. Background technique [0002] With the enhancement of people's awareness of environmental protection, more and more attention has been paid to the pollution of the social environment caused by the flue gas emitted by industrial boilers. The NOx contained in the gas-fired boiler exhaust gas has a greenhouse effect 200 times that of carbon dioxide, and is currently recognized as one of the main causes of air pollution. Therefore, how to reduce and control the NOx content in the gas-fired boiler exhaust gas has become an important issue. Issues of common concern to the industry and environmental protection depa...

AI Technical Summary

Problems solved by technology

However, it has been found in practice that the structural form in which the secondary air nozzles are arranged on the three side walls of the furnace and the work in which the secondary air enters the furnace directly and directly impacts and mixes with the bottom-up flue gas flow Generally, the range of the secondary air is short, the airflow generated by the interaction in the furnace is relatively chaotic, and the effective working stroke is also short, so the atmosphere constructed by this to realize the thick and thin combustion is not ideal, resulting in the current use of this structure and work Although the form of gas boiler can basically meet the current 30mg / Nm 3 Environmental protection emission standard requirements, but its margin of compliance is not ideal, so it is difficult to meet the further tightened higher low nitrogen emission index requirements, so it is necessary to make the layout of the secondary air nozzle reasonable and the working method scientific Conduct in-depth discussions, innovations and breakthroughs, so that the theoretically feasible overfire air technology can play its due role more fully in the practice of gas-fired boilers with significant nitrogen-reducing combustion, and meet the increasingly stringent requirements for various types of gas-fired boilers. Higher and lower nitrogen emission targets require basic guarantees

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