A pulverized coal low NOx oxygen-enriched combustion device

Abstract

The invention discloses a pulverized coal low-NOx and oxygen-enriched combustion device. The pulverized coal low-NOx and oxygen-enriched combustion device comprises a hearth, an oxygen tank, an oxidizing agent nozzle, a central nozzle, a steam nozzle and a steam generator, wherein the central nozzle is mounted on one side of the hearth; the lateral wall of a primary air pipeline is connected with the outlet of the steam generator through a primary steam inlet pipeline; the oxidizing agent nozzle is mounted on the side, with the central nozzle, of the hearth; the outlet of the oxidizing agent nozzle extends into the hearth, the inlet of the oxidizing agent nozzle is connected with a secondary air pipeline, the secondary air pipeline is connected with the primary steam inlet pipeline through a secondary steam inlet pipeline, and the lateral wall of the secondary air pipeline is connected with the oxygen tank through an oxygen inlet pipe; the steam nozzle is mounted on the side, with the central nozzle, of the hearth. The pulverized coal low-NOx and oxygen-enriched combustion device has the advantages steam is added to lower the temperature peak in a furnace, the temperature field distribution in the hearth is allowed to be even, smoke circulating equipment is reduced, constant nitrogen accumulation in smoke circulation is eliminated, NOx emission is lowered, combustion efficiency is increased, and cost is saved.

Description

technical field [0001] The invention belongs to the field of coal-fired boilers, and more specifically relates to a pulverized coal low-NOx oxygen-enriched combustion device. Background technique [0002] Coal is the main energy source in my country, accounting for 65-70% of primary energy consumption, and generating electricity through coal-fired boilers accounts for 75% of the total power generation. The burning of coal produces a large amount of greenhouse gas CO 2 and nitrogen oxides NOx have brought great environmental problems to our country, so the development of CO 2 Combustion technology with trapping and low NOx emission functions is necessary. [0003] Oxygen-enriched combustion is a promising large-scale CO2 technology in coal-fired boiler power generation technology. 2 One of the emission reduction technologies. This technology uses pure oxygen and circulating flue gas instead of air as the oxidant to enter the furnace for combustion, and the CO in the flue ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a pulverized coal low NOx oxygen-enriched combustion device, which dilutes the oxygen to a lower concentration through the high-speed jet entraining the smoke, and at the same time reduces the temperature in the furnace by adding water vapor The peak value makes the temperature field in the furnace evenly distributed, which solves the problem of complex oxygen-enriched combustion devices in the power industry, low combustion efficiency, high NOx emissions, and CO 2 Problems such as high cost of capture

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