Cooling flame frontal surface device capable of inhibiting generation of NOx in hearth of gas-fired boiler

Abstract

The invention discloses a cooling flame frontal surface device capable of inhibiting generation of NOx in a hearth of a gas-fired boiler. The device mainly comprises an upper pipe plate and a lower pipe plate, and two sets of cooling water pipes mounted between the upper pipe plate and the lower pipe plate and used for passing through cooling water; the two sets of cooling water pipes are adjacently arranged in front and back two rows in a flame combustion direction; the cooling water pipes in two rows are arranged in a staggered manner; gas flame in the hearth of the boiler is horizontal; the front and back two rows of cooling water pipes are arranged front and back in a direction perpendicular to the horizontal flame; the cooling water flowing direction of the cooling water pipes is from bottom to top; and the flow and speed control of the flowing cooling water uses the flame frontal surface temperature of 1450-1550 DEG C as standard. The device has such characteristics as simple and compact structure, convenience for use and control, capability of effectively inhibiting generation of NOx, improvement of combustion efficiency and amelioration of combustion conditions.

Description

technical field [0001] The invention relates to a cooling flame front device capable of suppressing NOx generation, and belongs to the technical field of boiler combustion. Background technique [0002] The composition of natural gas is CH4, and the combustion of natural gas in the vacuum boiler will produce NOx due to thermal type. According to the combustion mechanism of Teridovich, when the temperature of the combustion flame front is higher than 1500 ° C, NOx will start to be generated; the flame front Every time the temperature rises by 100°C, the synthesis rate of NOx increases by 6-7 times. Controlling the temperature of the flame front is the key factor to control the synthesis of NOx. At present, the combination of oxygen-enriched combustion, lean and rich fuel staged combustion, and flue gas recirculation is widely used to suppress the formation of NOx, which also brings many negative effects, such as the decrease of boiler efficiency (increased air-fuel ratio), an...

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Problems solved by technology

At present, the combination of oxygen-enriched combustion, lean and rich fuel staged combustion, and flue gas recirculation is widely used to suppress the formation of NOx, which also brings many negative effects, such as the decrease of boiler efficiency (increased air-fuel ratio), and the change of combustion conditions. Bad (the proportion of oxygen decreases during combustion), the structure is large and complex, and when the load changes, the control becomes more complicated

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