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Multi-dimensional air staged low NOx combustion system and layout method

An air classification and combustion system technology, applied in the field of boilers, can solve the problems of boiler water wall slagging, boiler combustion deterioration, boiler tangential reversal and other problems, to strengthen mixing, reduce carbon content in bottom slag, and reduce NOx emissions Effect

Active Publication Date: 2019-11-05
HARBIN BOILER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that the existing NOx combustion method is easy to cause boiler combustion to turn round and reverse, resulting in deterioration of boiler combustion, slagging of boiler water wall, and aggravated high-temperature corrosion, and to provide a method that can effectively prevent boiler water wall slagging and high-temperature corrosion. , multi-dimensional air staged low NOx combustion system and arrangement method for reducing NOx emissions

Method used

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  • Multi-dimensional air staged low NOx combustion system and layout method
  • Multi-dimensional air staged low NOx combustion system and layout method
  • Multi-dimensional air staged low NOx combustion system and layout method

Examples

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Effect test

Embodiment 1

[0023] A multi-dimensional air staged low NOx combustion system, which consists of: a main burner and a two-stage burn-off air burner, the main burners are respectively arranged at the four corners of the boiler furnace 25, and the center of the main burner The axis 22 forms an included angle with the boiler furnace water wall α，α 40-43°, the main burner is arranged with a group of secondary air nozzles and primary air nozzles arranged at intervals to form a small imaginary tangent circle, which can effectively avoid slagging and high temperature corrosion on the water wall.

Embodiment 2

[0025] According to the multidimensional air staged low NOx combustion system described in Embodiment 1, the secondary air nozzles include a set of auxiliary secondary air nozzles, a set of oil secondary air nozzles and OFA air nozzles 1, and a set of auxiliary air nozzles 1 The secondary air nozzles are AA layer auxiliary secondary air nozzle 11, AB layer auxiliary secondary air nozzle 10, BC layer auxiliary secondary air nozzle 15, CD layer auxiliary secondary air nozzle 6, DE layer auxiliary secondary air nozzle 4 , EF layer auxiliary secondary air nozzle 20 and FF layer auxiliary air secondary air nozzle 21, one group of oil secondary air nozzles are respectively BC layer oil secondary air nozzle 8, CD layer oil secondary air nozzle 16, DE layer oil secondary air nozzle 18 and EF layer oil secondary air nozzle 3, the OFA air forms a tangential circle in the boiler in the opposite direction to the auxiliary air secondary air, which is conducive to strengthening the mixing of...

Embodiment 3

[0027] According to the multi-dimensional air staged low NOx combustion system described in embodiment 1 or 2, the primary air nozzles include A layer primary air nozzles 12, B layer primary air nozzles 9, two lower layer primary air nozzles, C layer primary air nozzles 7 1, D layer primary air nozzle 17 two middle layer primary air nozzles and E layer primary air nozzle 19, F layer primary air nozzle 2 two upper layer primary air nozzles.

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Abstract

The invention provides a multi-dimensional air staging low-NOx combustion system and an arrangement method. The stable combustion capability and the pulverized coal combustion efficiency of a boiler during the unit low-load operation stage are not taken into consideration in an existing staging NOx combustion method. During the unit low-load operation stage, if concentrated phase pulverized coal air flow deflects towards the fire-side water-cooled wall at wide angle, the problems that boiler combustion gets worse, slag is agglomerated on the water-cooled wall of the boiler and high-temperaturecorrosion becomes more severe due to reverse rotation of the boiler combustion tangential circle occur very easily. The multi-dimensional air staging low-NOx combustion system comprises main combustors and two-stage over- fire air combustors. The main combustors are arranged at the four corners of a boiler furnace (25) correspondingly. An included angle alpha formed between the central axis (22)of each main combustor and the water-cooled wall of the boiler furnace is 40-43 degrees. A set of secondary air nozzles and primary air nozzles arranged in a spaced mode are arranged on each main combustor.

Description

Technical field: [0001] The invention relates to a multi-dimensional air staged low NOx combustion system and an arrangement method, belonging to the technical field of boilers. Background technique: [0002] At present, my country's electric energy is dominated by coal-fired thermal power generation. Nitrogen oxides are one of the important pollutants produced in the process of coal combustion. The emission problem has been increasingly valued by the environmental protection department. The latest standards require coal-fired thermal power boilers NOx Emissions below 50mg / Nm 3 . At present, the final emission of NOx is mainly reduced by controlling the amount of NOx generated during the combustion process in the boiler furnace and the tail flue gas denitrification technology. Controlling the amount of NOx generated during the combustion process in the furnace is low NOx combustion technology, and its core is staged combustion. At present, the most common method is to carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23L9/00F23D1/00
CPCF23D1/00F23L9/00
Inventor 于强孙浩郑晓军周顺文陈琪李江浩郭森董亮
Owner HARBIN BOILER CO LTD
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