電廠低氮燃燒器的具體改造措施

前面的文章我們基本了解了在改造前電廠低氮燃燒器的一些基本情況，接下來呢，我們就來談談電廠低氮燃燒器的具體改造措施。我們將電廠低氮燃燒器的改造分為以下四點：
In the previous article, we had a basic understanding of some basic conditions of the low-nitrogen burner in the power plant before the renovation. Next, we will talk about the specific modification measures of the low-nitrogen burner in the power plant. The transformation of the low-nitrogen burner in the power plant is divided into the following four points:

1、水平方向偏轉調整分離式燃盡風
1. Horizontal deflection adjustment of separated exhaust air

分離式燃盡風每一層都分為3個小風室，每個風室裝有的燃盡風噴嘴都是可調節的，并可以大范圍的在水平方向進行調整，由手動完成。爐膛運行時有一定要求的，為了保證燃盡風噴嘴在傾斜角度調整上能夠符合這些要求，這些噴嘴的水平方向傾斜調節角度要嚴格按照爐膛的轉角形狀進行限制。通常情況下，燃盡風噴嘴應順時針傾斜為確保爐膛內的燃燒效率，因為如果不傾斜的直向燃盡風噴口噴出燃亮氣體后，就會導致三個噴出的燃料風相互影響，直接導致原本配好的煤粉與空氣之間的組織結構被破壞。但是如果將燃盡風的噴口傾斜設置，就能夠確保噴口噴出的燃料風在爐膛內順時針旋轉，這樣就能保證燃料風燃燒的正常運行。也就是說在啟動試驗的開始階段和低NOx同軸燃燒系統調試過程中能夠確定分離式燃盡風噴口水平方向偏轉的最佳角度，一旦確定了這個水平方向偏轉的最佳角度，在以后的運行中就不必重新調整了。以上所說的是順時針傾斜的情況，但在實際情況中也有少數逆時針傾斜的分層分離式燃盡風，電廠一般不會采用這種方式工作，因為這種逆時針傾斜方式會導致燃燒器中的燃料風逆時針旋轉，與地球自轉相反，不能使燃料充分燃燒。
Separated exhaust air each layer is divided into three small air Chambers, each of which is equipped with an adjustable exhaust air nozzle, and can be adjusted in a wide range of horizontal direction by hand. Run at a certain requirements of the hearth, in order to guarantee the burning wind nozzle on the tilt Angle adjustment can meet these requirements, the nozzle to adjust the horizontal tilt Angle in strict accordance with the chamber of a stove or furnace to limit the corner shape. Normally, burning wind nozzle should be clockwise tilted in order to ensure the combustion efficiency inside the furnace, because if not tilt straight to burning wind blast after burning gas, can lead to three jet fuel wind influence each other, as a direct result of originally with good organization structure between the pulverized coal and air are destroyed. However, if the exhaust air nozzle is tilted, it can ensure that the fuel air from the nozzle rotates clockwise in the furnace, thus ensuring the normal operation of fuel air combustion. That is to say, at the beginning of the start experiment and low NOx coaxial combustion system can determine the separate burning wind vents in the process of debugging the best Angle, horizontal deflection once you determine the best Angle of horizontal deflection, in the later in the operation of the don't have to readjust. Said above is clockwise tilted condition, but in reality there are a few counter-clockwise tilted layered separate burning wind and power plants generally do not work in this way, because this way counterclockwise tilt causes of fuel in the burners wind counterclockwise, in contrast to the earth's rotation, can't make the fuel burn adequately.

2、垂直方向偏轉調整分離式燃盡風
2.Vertical deflection adjusts separate exhaust air

要實現對偏轉的調整，得通過調節分離式燃盡風噴口的連接桿并在水平方向調節，連接桿直接連接在每一個分離式燃盡風噴嘴的本體上。每一層分離式燃盡風風室的下面有兩個分離式燃盡風噴嘴，在水平方向調整連接桿，并將它們分別連接到特有的曲柄結構上，這個曲柄結構是以固定在燃盡風風箱旁邊的定位銷為轉軸的結構。每一層分離式燃盡風風箱里的3個噴嘴和3個連接曲柄結構都要連接到這層的分離式燃盡風風箱的這個垂直偏轉驅動結構連接桿上。而每一層分離式燃盡風的風室里最上層的噴嘴曲柄都要連接到一個“穿過風箱一側連接到風箱外部驅動結構的轉軸”上。
To realize the adjustment of deflection, the connecting rod of the separated exhaust air nozzle can be directly connected to the body of each separate exhaust air nozzle by adjusting the connecting rod of the separated exhaust air nozzle and adjusting the horizontal direction. Each layer separate burning wind wind chamber below, there are two separate burning wind nozzle, adjust the connection rod in horizontal direction, and connect them to the characteristic of the crank structures, the crank structure is fixed by the burning wind bellows locating pin for the structure of the shaft. The three nozzles and three connecting crank structures in each separate layer are connected to the vertical deflecting drive structure connecting rod of the separate exhaust fan box in this layer. The upper nozzle crank in each separate layer of exhaust air chamber is connected to a "shaft connecting through the side of the bellows to the external drive structure of the bellows".

3、利用火焰附著式煤粉燃燒器噴嘴
3. Use flame attached coal burner nozzle

附著式火焰煤粉燃燒器噴嘴利用減少煤粉流著火點離噴嘴的距離，對于控制氮化氣體的產生起到一定的輔助作用。而這個流程的實現需要空氣偏導器的幫助，在噴嘴出口位置安裝空氣偏導器起到增大噴口區域的氣流阻力作用，并能夠有效的簡短煤粉流著火點離噴嘴的距離。通過調節風室風門的開合度來拉進著火點被噴嘴的距離，二次風就可以吹向煤粉流的周圍和后面，這樣對燃料風的內部組成結構也形成控制，從而確定噴嘴噴出的燃料風火焰的形狀。對爐膛內火焰形狀的準確控制是滿足爐膛內燃料燃燒需求的基礎，把整個低NOx同軸燃燒系統當作一個整體，這個整體被控制時，火焰附著式煤粉燃燒器噴嘴的操作就與調節到適當的煤粉燃燒器噴嘴出口的一次風風速和風量以及適當的煤粉細度密切相關。利用燃料風翻板門的開度在燃燒調節試驗中調整并維持適當的著火點位置來實現優化。
By reducing the distance between the ignition point of coal powder flow and the nozzle, the attached flame coal burner nozzle plays an auxiliary role in controlling the generation of nitriding gas. And the process of implementation needs the help of air deflector, in nozzle exit location to install the air deflector increasing the vent area of turbulence effect, and can effectively brief pulverized coal stream ignition of the distance from the nozzle. By adjusting the opening degree of wind chamber damper to pull into the ignition distance of the nozzle, secondary air can blow to the pulverized coal flow around and behind, so that the wind of the internal structure and control of fuel, so as to determine the fuel nozzle wind of the shape of the flame. Accurate control of the shape of the flame in the hearth is the basis of meet the demand of the fuel burning in the hearth, the whole low NOx coaxial combustion system as a whole, the overall control, the operation of the attached type pulverized coal flame burner nozzle and adjust to the appropriate pulverized coal burner nozzle exit of a wind wind speed and air volume and proper pulverized coal fineness is closely related. The optimization is realized by using the opening degree of the fuel air flap door to adjust and maintain the proper ignition point position in the combustion regulation test.

通過對4個風箱的統一控制，每一個噴嘴的火焰形狀都會受到嚴格精確的控制，從而確保對爐膛內火焰的燃燒溫度、接觸面積以及形狀進行準確控制，滿足了電廠需求。
Through the unified control of the four bellows, every the flame shape of nozzle is strictly accurate control, to ensure that the combustion temperature of the flame in the hearth and the contact area and shape for precise control, meet the demand of the power plant.

4、水平分級配風技術的應用
4. Application of horizontal grading ventilation technology

技術不斷在改造，電廠中推廣了應用水平分級配風技術。水平分級配風技術是將在爐膛中的一部分二次風從主燃燒區抽離出來，減少了煤粉與風也就是煤粉流之間的接觸，從而降低了煤粉流揮發出的階段燃燒化學當量比，使煤粉流在自然揮發中生成高富燃料的火焰，維持爐膛水冷壁周圍的氧化性氛圍。這種方法不但能通過維持爐膛水冷壁周圍的氧化性氣氛，使爐膛內腐蝕和結渣的幾率降低，從而使水冷壁保持相對干凈，而且這種方法會使二次風與煤粉流不再接觸，間接的對NOx的產生進行有效的控制，這樣燃燒結束后就不會產生過多的有害污染物，契合了當下社會提倡的環保生產綠色經濟發展的觀念。

The technology is being improved continuously, and the technology of horizontal grading air distribution has been popularized in power plants. Horizontal classification air distribution technology is part of the secondary air in furnace from the main combustion zone, reduce the coal and wind, that is, the contact between the pulverized coal flow, which reduces the volatilization pulverized coal flow out of the stage combustion chemical equivalent ratio, Grosvenor LTD is generated in the pulverized coal flow in the natural volatile fuel flame, and maintain the furnace water wall surrounding the oxidizing atmosphere. This method can not only by maintaining the furnace water wall surrounding the oxidizing atmosphere, reduce the probability of corrosion and slagging in the hearth, keeping water wall relatively clean, and this method can make the secondary air and pulverized coal flow no longer contact, indirect for effective control of NOx, so after the burning will not have too much harmful pollutants, to fit the current social advocate environmental protection in the production of green economy development concept.