A low-nitrogen swirl pulverized coal burner with fuel-saving/gas ignition and stable combustion

Abstract

A fuel / gas-saving ignition stable-combustion low-nitrogen swirling pulverized coal combustor, comprising a primary air channel (2), a multi-channel secondary air intake pipe and a fuel / gas combustor (1). A circle of straightening vanes (15) are evenly distributed on the inner wall of an entryway of a strengthened combustion chamber (16) in the primary air channel (2). A circle of swirling vanes (14) are evenly distributed on the front outer wall of the fuel / gas combustor (1). The length from the front end of the swirling vane (14) to the front end of the fuel / gas combustor (1) is larger than or equal to the length of the straightening vane (15), and the outer diameter of the swirling vane (14) is smaller than the inner diameter of the straightening vane (15). The fuel / gas combustor (1) is adjustable front and back, causing relative positions of the swirling vanes (14) and the straightening vanes (15) to change. The swirling intensity of secondary air of the combustor can be adjusted online, a proper high-temperature flue gas recirculation zone is formed in the center of a nozzle of the combustor through adjustment of the swirling intensity of the secondary air, and a stable heat source is provided for ignition and stable combustion of pulverized coal.

Description

technical field [0001] The invention relates to a pulverized coal burner, in particular to a pulverized coal burner suitable for power plant boilers which is fuel-saving / gas-ignited, stable-combustible, and low-nitrogen swirling flow. Background technique [0002] At present, pulverized coal boilers in power stations in the world generally use large oil guns to achieve start-up and low-load stable combustion. According to statistics, the domestic power system uses nearly 10 million tons of oil for boiler commissioning, start-up, low-load stable combustion, and shutdown for combustion-supporting fuel, accounting for 15% of the country's total fuel consumption, worth tens of billions of yuan, and consuming a large amount of oil. fuel resources, but also greatly increase the cost of power generation. China's coal resources are much more abundant than oil and gas resources, and the energy consumption structure dominated by coal has not changed in recent decades. The power gene...

AI Technical Summary

Problems solved by technology

However, many low-nitrogen burners currently have problems such as severe wear, slagging at the nozzle and high-temperature corrosion, and are not well adaptable to coal types.

[0004] At present, as far as the swirl burners of wall-fired boilers are concerned, the application method of fuel-saving ignition technology is to remove the primary air part of a row of swirl burners and replace them with fuel-saving ignition pulverized coal burners, and fuel-saving ignition pulverized coal The burner does not have the performance structure of a low-nitrogen burner when the boiler is in normal operation, which often reduces the low-nitrogen and stable combustion performance of the entire row of swirl burners used for fuel-saving ignition technology

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