阅读说明：本技术 一种火电厂燃煤锅炉低Nox燃烧器 (Low NOx combustor of coal fired boiler of thermal power plant ) 是由 孟祥玉 宋宏伟 王洪松 闫青 高名一 于喜文 陈志勇 韩极光 陈向崴 王宇 董靖 于 2019-12-24 设计创作，主要内容包括：一种火电厂燃煤锅炉低Nox燃烧器,有风粉混合管道,风粉混合管道内的轴线处有中心风管,中心风管的前端连有燃烧室,中心风管的中段定位套有圆环形离心煤粉浓缩器,中心风管内有微油油枪,风粉混合管道内有可在风粉混合管道内前、后滑动的圆环形向心煤粉浓缩器,向心煤粉浓缩器圆环的一侧均布连有伸出风粉混合管道的拉杆。当向心煤粉浓缩器滑动到离心煤粉浓缩器的前方、燃烧室的后端,本低Nox燃烧器具备对燃煤锅炉的微油点火功能。点火成功后,再让向心煤粉浓缩器滑动到离心煤粉浓缩器的后方,有利于煤粉低Nox燃烧。(The utility model provides a coal fired boiler of thermal power plant hangs down NOx combustor, there is the wind powder mixing tube, there is central tuber pipe axis department in the wind powder mixing tube, the front end of central tuber pipe even has the combustion chamber, the middle section position sleeve of central tuber pipe has ring shape centrifugation buggy concentrator, there is the tiny-oil gun in the central tuber pipe, there is the annular centripetal buggy concentrator that can slide before and after in the wind powder mixing tube, one side equipartition of centripetal buggy concentrator ring even has the pull rod that stretches out the wind powder mixing tube. When the centripetal pulverized coal concentrator slides to the front of the centrifugal pulverized coal concentrator and the rear end of the combustion chamber, the low Nox combustor has the function of igniting the tiny oil of the coal-fired boiler. After ignition is successful, the centripetal pulverized coal concentrator slides to the rear of the centrifugal pulverized coal concentrator, and low Nox combustion of pulverized coal is facilitated.)

1. The utility model provides a low NOx combustor of coal fired boiler of thermal power plant has the wind powder hybrid tube, and there is central tuber pipe axis department in the wind powder hybrid tube, and the front end of central tuber pipe even has the combustion chamber, and the middle section pot head of central tuber pipe has ring shape centrifugation buggy concentrator, its characterized in that:

the central air pipe is internally provided with a tiny oil gun, the air-powder mixing pipeline is internally provided with a circular centripetal pulverized coal concentrator which can slide in the air-powder mixing pipeline forwards and backwards, and one side of the circular ring of the centripetal pulverized coal concentrator is uniformly connected with pull rods extending out of the air-powder mixing pipeline.

2. The thermal power plant coal fired boiler low Nox burner as claimed in claim 1, wherein: and the pull rod extending out of the air-powder mixing pipeline is connected with an air cylinder or a hydraulic cylinder.

Technical Field

The invention relates to a low Nox burner of a coal-fired boiler of a thermal power plant, in particular to a pulverized coal concentrator of the low Nox burner of the coal-fired boiler of the thermal power plant.

Background

Coal-fired boilers of thermal power plants use pulverized coal as fuel.

The combustion system of the coal-fired boiler of the thermal power plant is provided with a plurality of layers of burners for opposed firing, wherein the burner at the lowest layer is a micro-oil ignition burner, and the burners at the upper layers are low Nox burners.

The combustor is provided with a wind-powder mixing pipeline, a central wind pipe is arranged at the axis in the wind-powder mixing pipeline, and the front end of the central wind pipe is connected with a combustion chamber.

The central air pipe of the micro-oil ignition burner is internally provided with a micro-oil gun, and the inner wall of the air-powder mixing pipeline and the rear end of the combustion chamber are positioned and embedded with a circular annular centripetal pulverized coal concentrator.

The middle section of the central air pipe of the low Nox burner is sleeved with a circular centrifugal pulverized coal concentrator in a positioning way.

The micro-oil ignition burner is used for ignition and combustion after ignition of the coal-fired boiler, and the low NOx burner is used for low NOx combustion of the coal-fired boiler under normal operation conditions.

When the coal-fired boiler is ignited, in the micro-oil ignition burner, the centripetal pulverized coal concentrator is used for carrying out centripetal concentration on pulverized coal entering the air-powder mixing pipeline, so that the pulverized coal in the air-powder mixing pipeline is concentrated inside and light outside, the pulverized coal amount in the combustion chamber is large, and the micro-oil ignition of the pulverized coal is facilitated.

When the coal-fired boiler normally burns, in the low Nox combustor, the centrifugal pulverized coal concentrator centrifugally concentrates the pulverized coal entering the air-powder mixing pipeline, so that the pulverized coal in the air-powder mixing pipeline realizes 'thick outside and thin inside', the pulverized coal amount in the combustion chamber is small, and the low Nox combustion of the pulverized coal is facilitated.

Disclosure of Invention

The invention aims to overcome the defects and provides a low Nox burner of a coal-fired boiler of a thermal power plant, which has an ignition function for the coal-fired boiler.

The present invention is realized by the following method.

This coal fired boiler hangs down NOx combustor of thermal power plant has the wind powder hybrid tube, there is central tuber pipe axis department in the wind powder hybrid tube, the front end of central tuber pipe even has the combustion chamber, the middle section position sleeve of central tuber pipe has ring shape centrifugal pulverized coal concentrator, there is the tiny-oil gun in the central tuber pipe, there is the annular centripetal pulverized coal concentrator that can be preceding in the wind powder hybrid tube, gliding ring shape after, in the centripetal pulverized coal concentrator ring, one side equipartition of centripetal pulverized coal concentrator ring even has the pull rod that stretches out the wind powder hybrid tube.

The central air pipe of the invention is internally provided with a tiny oil gun, the air-powder mixing pipeline is internally provided with a circular centripetal pulverized coal concentrator which can slide in the air-powder mixing pipeline forwards and backwards, and one side of the circular ring of the centripetal pulverized coal concentrator is uniformly connected with pull rods which extend out of the air-powder mixing pipeline. The pulling of the pull rod can lead the circular centripetal pulverized coal concentrator to slide forwards and backwards in the air-powder mixing pipeline.

When the centripetal pulverized coal concentrator slides to the front of the centrifugal pulverized coal concentrator and the rear end of the combustion chamber, the centripetal pulverized coal concentrator performs centripetal concentration on pulverized coal entering the air-powder mixing pipeline, the pulverized coal in the air-powder mixing pipeline achieves 'inside concentration and outside dilution', the pulverized coal amount in the combustion chamber is large, and then the low Nox combustor is matched with micro oil entering a micro oil gun to achieve ignition of the coal-fired boiler, so that the low Nox combustor has a micro oil ignition function of the coal-fired boiler. After ignition is successful, the centripetal pulverized coal concentrator slides to the rear of the centrifugal pulverized coal concentrator, so that the centrifugal pulverized coal concentrator can perform centrifugal concentration on pulverized coal entering the air-powder mixing pipeline, the pulverized coal in the air-powder mixing pipeline is enabled to realize 'thick outside and thin inside', and low Nox combustion of the pulverized coal is facilitated.

The invention will be further described with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic main sectional view of a thermal power plant coal fired boiler low NOx burner as it is used for ignition in accordance with the inventive aspects of the present invention;

FIG. 2 is a schematic main sectional view of the low NOx burner of the coal fired boiler of the thermal power plant of FIG. 1 when used for normal combustion.

Detailed Description

In fig. 1 and fig. 2, a coal-fired boiler low Nox burner of a thermal power plant has a wind-powder mixing pipeline 1, a central air pipe 2 is arranged at the axis in the wind-powder mixing pipeline, the front end of the central air pipe is connected with a combustion chamber 3, a ring-shaped centrifugal pulverized coal concentrator 4 is sleeved at the middle section of the central air pipe, a micro-oil gun 5 is arranged in the central air pipe, a ring-shaped centripetal pulverized coal concentrator 6 which can slide in the wind-powder mixing pipeline forwards and backwards is arranged in the wind-powder mixing pipeline, and a pull rod 7 extending out of the wind-powder mixing pipeline is uniformly distributed on one side of the ring of the centripetal pulverized coal concentrator.

The pull rod extending out of the air-powder mixing pipeline can be connected with a driving device, and the driving device can be an air cylinder or a hydraulic cylinder. The centripetal pulverized coal concentrator is driven by a cylinder or a hydraulic cylinder to slide back and forth in the air-powder mixing pipeline.

In fig. 1 and 2, the pull rod extending out of the air-powder mixing pipeline is connected with an air cylinder or a hydraulic cylinder 8.