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改造前的电厂低氮燃烧器概况

作者: 西安催化燃烧设备 来源: 未知 时间: 2020-06-23 浏览次数:
跟着国内新环保尺度的推出和执行,电厂作为低氮燃烧革新的主要项目,积极响应号召进行低氮整改。电厂低氮燃烧革新举动,在必然水平上对电厂运行效率有很大的提拔,同时对电厂

跟着国内新环保尺度的推出和执行,电厂作为低氮燃烧革新的主要项目,积极响应号召进行低氮整改。电厂低氮燃烧革新举动,在必然水平上对电厂运行效率有很大的提拔,同时对电厂电力生产运动的环保性也有积极感化。电厂低氮燃烧器布局复杂,各部门匹配要求尺度高,对此,我们需精确把握电厂电厂低氮燃烧器的构造,为后续的整改工作打下坚实的根本。

With the introduction and implementation of new domestic environmental protection standards, power plants, as an important project of low nitrogen combustion renovation, have responded positively to calls for low nitrogen rectification. The low nitrogen combustion retrofit activities of the power plant have greatly improved the operation efficiency of the power plant to a certain extent, and also have a positive effect on the environmental protection of the power production activities of the power plant. The structure of low-nitrogen burners in power plants is complex and the matching requirements of various parts are high. therefore, we need to accurately grasp the structure of low-nitrogen burners in power plants and lay a solid foundation for subsequent rectification work.


低氮燃烧器


1、主风箱外部设备状况
1, the main bellows external equipment

风箱外部设备由焚烧器掌握柜、油焚烧器、火检装配首要构成。风箱设备中的所有风喷嘴和燃料喷嘴哄骗风箱外部的毗邻杆毗连到电动倾斜驱动单元上,并可以在垂直标的进行倾斜角度进行调整。风箱中炉膛四个角的倾斜驱动调节是同步的,包管了所有的喷嘴在倾斜角度方面都是沟通的。而炉膛中火球的相对位置经由使所有喷嘴倾斜水平同步来实现上下移动。风门的开合水平是凭据预先设定的法式来掌握的,而所有的风门都是由电动驱动装配驱动的。
The external equipment of bellows is mainly composed of igniter control cabinet, oil igniter and fire detector. All air nozzles and fuel nozzles in the bellows device are connected to the electric tilt drive unit by connecting rods outside the bellows and can adjust the tilt angle in the vertical direction. The tilt drive adjustment of the four corners of the hearth in the bellows is synchronous, ensuring that all nozzles are the same in terms of tilt angle. While the relative position of fireball in the hearth can move up and down by synchronizing the inclination of all nozzles. The degree of opening and closing of the air door is controlled according to a preset program, and all the air doors are driven by an electric drive device.

2、革新前的内部风箱构造
2. inner bellows structure before renovation

在电厂低氮燃烧器革新进行之前,位于炉膛的四个角离别有4个风箱,这些风箱内的设备将燃料和风送到炉膛内,以确保对炉膛内燃料和风量的节制。每个风箱内部都被朋分成9个小风室,这9个小风室内离别安装有二次风喷口或煤粉燃烧器。每个风箱内都有本身自力的动作掌握系统,行使翻板门的形式对进入到炉膛内的风量和燃料量进行掌握,统一层的4个角的翻板门动作是同步的,是以进入这4个小风室的风量是一致的并包管炉膛内的燃料能充裕燃烧。翻板门在分歧层或许被调节到分歧的开合度,如许给风箱输送的燃料量和风量就会分歧。分歧层小风室内发生的二次风风速能够按照一些运行参数来掌握,如给煤量和风箱与炉膛内差压。
Before the reformation of the low nitrogen burners in the power plant, there were four air boxes at each of the four corners of the furnace. the equipment in these air boxes sent fuel and wind to the furnace to ensure the control of the fuel and air volume in the furnace. The inside of each air box is divided into nine small air chambers, which are respectively provided with secondary air nozzles or pulverized coal burners. Each air box has its own independent action control system, which uses flap doors to control the air volume and fuel volume entering the furnace. the flap doors of the four corners on the same floor are synchronized, so the air volume entering the four small air chambers is consistent and the fuel in the furnace can be fully combusted. The flap door can be adjusted to different opening and closing degrees in different layers, so that the amount of fuel and air delivered to the bellows will be different. The wind speed of the secondary air generated in different small wind chambers can be controlled according to some operating parameters, such as the amount of coal supplied and the differential pressure between the bellows and the furnace.

3、风室内部配风状况
3. air distribution inside the air chamber

燃料风又称周界风或3次风,风源来自二次风大风箱引出。位置接近煤粉喷嘴,起到加快和混和煤粉气流以及冷却煤粉喷嘴的感化,每个煤粉喷嘴都配备一个燃料风室,普通由本层的给煤量掌握。辅助风首要是过程两层煤粉燃烧器喷口层之间的小风室进入炉膛的二次风,它是对炉膛内的燃烧效率进行调节的风项。能够经由调整这些“燃烧节制风门”(掌握辅助风的翻板门)的开合水平对炉膛内部的燃烧压力与风量之间的差压进行掌握。经由调节风门开度和炉膛进风量来包管其他燃料和氧气的进入。
The fuel wind is also called perimeter wind or tertiary wind, and the wind source comes from the large secondary wind bellows. It is located close to the pulverized coal nozzles and plays a role in accelerating and mixing the pulverized coal flow and cooling the pulverized coal nozzles. each pulverized coal nozzle is equipped with a fuel plenum, which is generally controlled by the coal supply quantity of this floor. The auxiliary air is mainly the secondary air entering the hearth through the small air chamber between the nozzle layers of the two-layer pulverized coal burner. it is the air term that regulates the combustion efficiency in the hearth. The differential pressure between combustion pressure and air volume in the furnace can be controlled by adjusting the opening and closing degree of these " combustion control dampers" ( flap doors controlling auxiliary air ). Other fuels and oxygen can be ensured to enter through adjusting the opening of the air door and the air inlet quantity of the hearth.


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