Combustion method capable of effectively reducing slagging of boiler hearth

A boiler furnace and combustion method technology, which is applied in the combustion method, combustion type, and combustion using lump fuel and liquid fuel, etc., can solve the deterioration of slagging of the water wall of the boiler furnace, the aggravation of high temperature corrosion of the water wall, and the furnace troubles the operation of the power plant. and other problems, so as to avoid the slagging and high temperature corrosion of the furnace water wall, reduce the flue gas temperature, and prevent the boiler water wall from slagging and high temperature corrosion.

CN109028038AActive Publication Date: 2018-12-18HARBIN BOILER
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-12-18

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Abstract

The invention relates to a combustion method capable of effectively reducing slagging of a boiler hearth. Electrical energy is mainly obtained through thermal power generation of fire coal, power coalin China mostly is inferior coal, and slagging of a hearth during combustion is a problem plaguing the running of a power plant for a long time; and at present, a concentrated arrangement manner is adopted for combustors, the combustion temperature of pulverized coal is high, the slagging condition of a water-cooling wall of the boiler hearth is worsened, and the high-temperature corrosion of thewater-cooling wall is intensified. According to the combustion method, from composition, main combustors are comprised, each main combustor comprises a group of primary air nozzles and secondary airnozzles which are arranged at intervals, horizontal concentrated-dilute nozzles are selected as the primary air nozzles, the spiral directions of the secondary air nozzles are parallel to the centralaxes of the combustors, and the sprayed gas flow is parallel to the central axes of the combustor; and the main combustors are installed at the four corners of the boiler hearth, the central axes of the corner combustors and the water-cooling wall of the hearth form included angles alpha, and a small imaginary tangent circle is formed, so that the slagging and the high-temperature corrosion of thewater-cooling wall are effectively avoided. The invention relates to a combustion method capable of effectively reducing slagging of a boiler hearth.
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Description

Technical field:

[0001] The invention relates to a combustion method capable of effectively reducing boiler furnace slagging. Background technique:

[0002] Power energy is mainly coal-fired thermal power generation. Most of the power coal used in my country is low-grade and inferior coal. Slagging in the furnace during boiler combustion is a long-term problem that has plagued the operation of power plants. Currently, the burners are arranged in a centralized manner, and the pulverized coal combustion temperature If the temperature is higher, the slagging of the water wall of the boiler furnace will deteriorate, and the high temperature corrosion of the water wall will intensify.

[0003] Studies have shown that boiler slagging is caused by the flue gas with a temperature higher than the ash melting point scouring the heating surface of the boiler, and the molten ash in the flue gas adheres to the heating surface. Fly ash in the furnace area exists in a molten or semi-molten...

Examples

Embodiment 1

[0021] A combustion method capable of effectively reducing boiler furnace slagging, which comprises: a main burner, the main burner includes a group of primary air nozzles and secondary air nozzles arranged at intervals, and the primary air nozzles are selected at a level Thick and thin nozzles, the rotation direction of the secondary air nozzle is parallel to the central axis of the burner, and the ejected air flow is parallel to the central axis of the burner;

[0022] The combustion method that can effectively reduce boiler furnace slagging includes the following steps: firstly, the main burner is installed on the four corners of the boiler furnace, and the central axis of the corner burner forms a clamp with the water-cooled wall of the furnace. Angle α, α ranges from 40° to 43°, forming a small imaginary tangential circle, effectively avoiding slagging and high-temperature corrosion on the water wall;

[0023] The horizontal thick and thin coal concentrator divides the pr...