Low-calorific-value combustible gas rotational flow low-nitrogen combustor

Abstract

The invention provides a low-calorific-value combustible gas rotational flow low-nitrogen combustor. The low-calorific-value combustible gas rotational flow low-nitrogen combustor comprises a shell and a center ignition gun; a rotational flow disc and a plurality of center flame stabilizing guns are arranged in the shell; the center flame stabilizing guns are arranged around the center ignition gun and are parallel to the center ignition gun; the rotational flow disc is provided with an inner hole; the center flame stabilizing guns are located in the inner hole; the rotational flow disc is located on the front portions of the center ignition gun and the center flame stabilizing guns in the axial direction; a plurality of transition flame stabilizing guns are arranged in the shell and located in front of the front end face of the rotational flow disc; a plurality of peripheral main gas guns are arranged around the outer portion of the rotational flow disc; the center flame stabilizing guns, the transition flame stabilizing guns and the peripheral main gas guns communicate with low-calorific-value combustible gas; and combustion-supporting air is led into the shell, rotational flow combustion-supporting air is formed at the positions of the transition flame stabilizing guns, and direct flow combustion-supporting air is formed at the positions of the peripheral main gas guns. According to the low-calorific-value combustible gas rotational flow low-nitrogen combustor, the area temperature field of the combustor is uniform, and NOx emission is reduced while stable combustion is achieved; and through gas and air flow speed control, the combustor is free of tempering at the low load and free of flame lifting at the high load.

Description

technical field [0001] The invention belongs to the technical field of gas burners, and relates to a low calorific value gas burner, in particular to a low calorific value combustible gas swirl low nitrogen burner. Background technique [0002] At present, the utilization of low calorific value combustible gas with huge total energy has received great attention, and various forms of low calorific value gas burners have appeared in the market. The combustion characteristics of low calorific value gas mainly include the following aspects: [0003] (1) There are few combustible components in the gas, low calorific value, high ignition temperature, slow flame propagation speed, difficult to ignite and stable combustion; [0004] (2) The gas pressure is low and the fluctuation range is large, and it is easy to temper when the pressure is too low and the speed is too slow; [0005] (3) Most of the gas with low calorific value is the tail gas of the chemical production line, and ...

AI Technical Summary

Problems solved by technology

[0003] (1) There are few combustible components in the gas, low calorific value, high ignition temperature, slow flame propagation speed, difficult to ignite and stable combustion;

[0004] (2) The gas pressure is low and the fluctuation range is large, and it is easy to temper when the pressure is too low and the speed is too slow;

[0005] (3) Most of the gas with low calorific value is the tail gas of the chemical production line, and multiple production lines need to be aggregated and comprehensively utilized, and the flow rate of the gas varies greatly;

[0008] 1. It is difficult to ignite, and there are often misfires

[0009] 2. Tempering phenomenon often occurs at low load, which endangers the safety of boiler operation

[0010] 3. When the gas flow rate is slow, it is easy to extinguish the flame, and if the gas flow rate is too fast, it is easy to go off fire and cannot burn stably

[0011] 4. In order to ensure stable combustion, high temperature is maintained in the burner area, resulting in high NOx emissions

Images