Efficient counter-distributary self-preheating low-NOx combustion device

Abstract

The invention discloses an efficient counter-distributary self-preheating low-NOx combustion device. The combustion device comprises a gas core tube and a combustion chamber arranged at the front end of the gas core tube. A gas sprayer head of the gas core tube is located in the combustion chamber, and an air outlet air chamber is further arranged outside the combustion chamber in a sleeved mode. The gas core tube is sleeved with an air inner sleeve used for delivering combustion air into the combustion chamber, the air inner sleeve is sleeved with an annular smoke channel, and a plurality of special tubes used for increasing the heat exchange area are arranged in the smoke channel at equal intervals in the axial direction. A plurality of secondary air holes are formed in the air outlet air chamber, secondary air and a mixture after combustion are both sprayed into a hearth at high speed, a large amount of smoke can be induced to flow back, the concentration of fuel and O2 is reduced, the temperature of flames is lowered, and formation of heating power NOx is reduced. Meanwhile, air is distributed to the secondary air holes through the air outlet air chamber and sprayed into the hearth at high speed, and thus the ignition time can be effectively prolonged. The running cost of the combustion device and NOx emission can be reduced, and the combustion device can contribute to energy conservation and environment protection.

Description

technical field [0001] The invention belongs to the technical field of thermal energy and power engineering, and relates to a low NO x Combustion self-preheating combustion device, specifically related to a high-efficiency reverse cross-flow self-preheating low NO x Burning device. Background technique [0002] The self-preheating combustion device is a compact combustion device that combines a heat exchanger and a burner. It has a compact structure and flexible control, and is especially suitable for radiant tube heating and ON-OFF pulse combustion. Therefore, the self-heating preheating combustion device is widely used in furnaces with high temperature control accuracy and high-end protective atmosphere furnaces. [0003] The traditional self-preheating combustion device mostly adopts a sleeve-type finned tube structure. Due to the limited heat transfer area of ​​the heat exchanger, the exhaust gas temperature is relatively high and the thermal efficiency is low. The tr...

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Problems solved by technology

[0005] Due to the reverse cross-flow tubular heat exchange method, the combustion air can be preheated to a very high temperature, which is usually only 100-200°C lower than the flue gas, and can reach 800-950°C. If the traditional combustion method is adopted, the flame temperature will be very high , resulting in thermal NO x The sharp rise must rationally organize the combustion, reduce the flame temperature, and reduce the thermal NO x Formation

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