1. 风道布局
1. Air duct layout
除尘系统的排气点不宜过多，以方便各支管之间的阻力平衡
The exhaust points of the dedusting system should not be too many to facilitate the resistance balance between the branches
风道应垂直敷设，或尽量与水平方向夹角大于45度。如果需要水平铺设或倾角小于30度，应采取措施，如增加流量。
The air duct shall be laid vertically or the angle between the air duct and the horizontal direction shall be greater than 45 degrees. If horizontal laying is required or the inclination angle is less than 30 degrees, measures shall be taken, such as increasing the flow.
通风系统的风道应是圆形或长方形的风道，以保证在实用的前提下尽量做到整洁美观。
The air duct of the ventilation system shall be circular or rectangular to ensure that it is clean and beautiful as far as possible under the premise of practical use.
为了消除含有剧毒物质的排气系统，正压管段长度应尽量缩短，正压管段不得通过其他房间。
In order to eliminate the exhaust system containing highly toxic substances, the length of the positive pressure pipe section shall be shortened as far as possible, and the positive pressure pipe section shall not pass through other rooms.
为清除潮湿气体或含有蒸汽的风道，应施加不小于0.005的梯度，并在风道的点和风机的底部采取排水措施。
In order to remove moist gas or air duct containing steam, a gradient of not less than 0.005 shall be applied, and drainage measures shall be taken at the lowest point of air duct and at the bottom of fan.
通风设备、风道及配件等，应根据环境及气体的输送、蒸气或粉尘的腐蚀等，采取相应的防腐措施。
Ventilation equipment, air duct and accessories shall be provided with corresponding anti-corrosion measures according to the environment, gas transmission, steam or dust corrosion, etc.
通风系统风管应按要求设置必要的侧孔，其位置和数量应符合检测要求。
The air duct of ventilation system shall be provided with necessary side holes as required, and its position and quantity shall meet the inspection requirements.
2、除尘管道布置原则
2. Layout principle of dedusting pipeline
除通风管道布置图的一般原则外，还有一些特殊要求:
In addition to the general principles of the ventilation duct layout, there are also some special requirements:
(1)除尘系统的风道应为圆钢风道，其接头及接头应严密。
(1) The air duct of dedusting system shall be round steel air duct, and its joints and joints shall be tight.
(2)风道垂直安装或倾斜安装。倾斜安装与水平面的夹角应大于45°。坡度小或水平敷设的管段应尽量缩短，并采取措施防止积尘。
(2) The air duct shall be installed vertically or obliquely. The angle between inclined installation and horizontal plane shall be greater than 45 °. The pipe section with small gradient or horizontal laying shall be shortened as far as possible, and measures shall be taken to prevent dust accumulation.
(3)支管从主管的顶部或侧面插入，三通管的夹角为15°-45°。
(3) The branch pipe is inserted from the top or side of the main pipe, and the included angle of the tee pipe is 15 ° - 45 °.
(4)在异形管件附近设置封闭的清洗孔，易积尘。
(4) A closed cleaning hole is arranged near the special-shaped pipe fitting, which is easy to accumulate dust.
(5)除尘管道转弯处曲率半径R=1·5-3.0d。如果不允许曲率半径较大，则导叶应安装在弯头内。
(5) The radius of curvature at the turning of dedusting pipeline is r = 1.5-3.0d. If the radius of curvature is not allowed to be large, the guide vane shall be installed in the elbow.
3.空气管的选择
3. Selection of air pipe
(1)普通截面形状:
(1) Common section shape:
长方形:便于施工、装饰配合;零件容易制造。
Rectangle: convenient for construction and decoration; parts are easy to manufacture.
——常用于空调系统
——Commonly used in air conditioning system
圆:低电阻;材料低，强度高;配管很容易做。
Circle: low resistance; low material and high strength; easy to make piping.
——用于通风系统和空调的高速风道
——High speed air duct for ventilation system and air conditioning
其他形状:根据需要。
Other shapes: as needed.
4. 管标准化:
4. Tube Standardization:
(1)在通风管道统一规范中，圆形管道的直径为外径，矩形截面尺寸为外径，即尺寸包括相应的材料厚度。
(1) In the uniform specification for ventilation pipe, the diameter of circular pipe is the outer diameter, and the size of rectangular section is the outer diameter, that is, the size includes the corresponding material thickness.
(2)为了满足阻力平衡的需要，除尘管道和气密管道的管径规格有多种。
(2) In order to meet the demand of resistance balance, there are many pipe diameter specifications of dedusting pipe and airtight pipe.
(3)管道截面尺寸(直径、边长)采用R20系列，即管道截面尺寸按比公比大1.12的倍数编制。
(3) The pipeline section size (diameter, side length) adopts R20 series, that is, the pipeline section size is prepared by a multiple of 1.12 larger than the common ratio.
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