Boiler burner arrangement method, lignite boiler and combustion air control method of lignite boiler

A layout method and boiler combustion technology, applied in the boiler field, can solve problems such as the decrease of secondary air momentum, the imbalance of combustion dynamic field organization, and the increase of nitrogen oxide emissions, so as to achieve the effect of eliminating coking and reducing the impact

Pending Publication Date: 2021-11-19
HARBIN BOILER
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The substantial increase in the primary air rate has led to a sharp drop in the momentum of the secondary air for combustion in the furnace, and the organization of the combustion dynamic field in the furnace is out of balance. Problems such as pulverized coal flow brushing the wall, high-temperature corrosion, slagging of the water wall, and increased nitrogen oxide emissions have occurred. , seriously affecting the safe and stable operation of the boiler

Method used

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  • Boiler burner arrangement method, lignite boiler and combustion air control method of lignite boiler
  • Boiler burner arrangement method, lignite boiler and combustion air control method of lignite boiler

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Embodiment 1

[0026] Embodiment 1: the following combination figure 1 and figure 2 To illustrate this embodiment, this embodiment provides a method for arranging boiler burners. The four corners of the furnace 1 of the boiler are respectively arranged with burners 2 on the same horizontal plane. The arrangement method includes:

[0027] Each burner 2 is provided with a thick coal powder nozzle 21, a light coal powder nozzle 22 and a secondary air nozzle 23, and the thick coal powder nozzle 21, the light coal powder nozzle 22 and the secondary air Nozzles 23 eject dense-phase pulverized-coal airflow, light-phase pulverized-coal airflow and secondary air in one-to-one correspondence. The central axis and the central axis of the secondary air nozzle 23 are offset on the same side in the horizontal direction to the diagonals of the respective corners of the furnace 1, so that the dense-phase pulverized-coal airflow and the light-phase pulverized-coal airflow converge on The center O of the f...

Embodiment 2

[0033] This implementation provides a lignite boiler that adopts a boiler burner arrangement method described in Embodiment 1, such as figure 1 and figure 2As shown, the four corners of the furnace 1 of the lignite boiler are respectively equipped with burners 2 on the same horizontal plane, and each of the burners 2 is provided with a thick coal powder nozzle 21, a light coal powder nozzle 22 and a secondary air nozzle 23 , the central axis of the thick coal powder nozzle 21, the central axis of the light coal powder nozzle 22 and the central axis of the secondary air nozzle 23 are offset in the center of the furnace 1 on the same side in the horizontal direction, and the The dense coal powder nozzles 21, light coal powder nozzles 22 and secondary air nozzles 23 on the burners 2 at the four corners of the furnace hearth 1 of the lignite burning boiler are arranged in sequence along the circumference of the furnace hearth 1; the light coal powder nozzles The horizontal offse...

Embodiment 3

[0039] This embodiment provides a method for controlling the combustion air of a lignite boiler, which is applied to the lignite boiler described in Example 2. The primary air pulverized coal in the burner is separated by a pulverized coal concentration separator to form the dense phase pulverized coal airflow and The light-phase pulverized-coal airflow, the air volume of the dense-phase pulverized-coal airflow and the air volume of the light-phase pulverized-coal airflow respectively account for 50% of the pulverized-coal air volume of the primary air.

[0040] Further, the percentage of the pulverized coal mass flow rate in the dense phase pulverized coal airflow to the pulverized coal mass flow rate in the primary air pulverized coal flow is 95%.

[0041] In this embodiment, through the control of the air volume, the concentration of the concentrated coal powder has a relatively high proportion, which is conducive to the formation of a rotating airflow in the center of the f...

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Abstract

The invention relates to a boiler burner arrangement method, a lignite boiler and a combustion air control method of the lignite boiler, belongs to the technical field of boilers, and aims at solving the problems that in the combustion process of an existing lignite boiler, pulverized coal airflow wall painting, high-temperature corrosion, water cooling wall slagging, nitrogen oxide emission rising and the like are likely to occur. According to the boiler burner arrangement method, burners are arranged at the four corners of a hearth of a boiler on the same horizontal plane respectively, and the arrangement method comprises the steps that each burner is provided with a thick pulverized coal nozzle, a thin pulverized coal nozzle and a secondary air nozzle; the thick pulverized coal nozzle, the thin pulverized coal nozzle and the secondary air nozzle are in one-to-one correspondence to spray out thick-phase pulverized coal airflow, thin-phase pulverized coal airflow and secondary air. Concentrated-phase pulverized coal airflow is wrapped inside, so that the pulverized coal airflow is separated from the furnace wall through secondary air, pulverized coal cannot make contact with the furnace wall, and the problems of coking and high-temperature corrosion are fundamentally eradicated.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a boiler burner arrangement method, a lignite boiler and a combustion air control method thereof. Background technique [0002] Lignite has the characteristics of high moisture, high volatile matter, low ash melting point, and low calorific value. Limited by the drying output of the pulverizing system, the four-cornered round lignite boilers that have been put into operation in China are generally prone to flames, coking, and high nitrogen oxide emissions. question. The reason is that the primary air rate is too high, which leads to the reduction of the secondary air volume, especially in low-load operating conditions, this phenomenon is more serious. Coupled with the difference in coal quality in power plants, the primary air rate is further increased, and the primary air rate of some projects even reaches more than 50%, which is much higher than the design value of 30%-35%. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C5/32F23C7/00F23K3/02
CPCF23C5/32F23C7/002F23K3/02
Inventor 王静杰夏良伟顾玮伦于强黄莺王显山徐彦辉张超李艳东朱绘娟沈涛闫燕飞祝令昆
Owner HARBIN BOILER
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