在通风管道工程设计过程中，计算主要包括通风管道内气流阻力、通风管道内压力分布、通风管道水力计算、均匀通风管。
In the process of ventilation duct engineering design, the calculation mainly includes air flow resistance in ventilation duct, pressure distribution in ventilation duct, hydraulic calculation of ventilation duct and uniform ventilation duct.
1.通风系统的划分
1. Division of ventilation system
不同地区的工业通风系统对供、排风有不同的要求。当空间较大时，有多个相应的送排气点。本实用新型可分为多个送排风子系统，一个系统由风机和连接管组成，便于管理。该系统的主要基础是：如果生产过程和运行时间相同，建议将其分为一个系统。如果操作参数和空气处理要求相同，建议将其分为一个系统。不建议排气扇靠近排气点，排气点距离一个小系统，这将增加排气系统的阻力。
Industrial ventilation systems in different regions have different requirements for air supply and exhaust. When the space is large, there are multiple corresponding air supply and exhaust points. The utility model can be divided into a plurality of air supply and exhaust subsystems. One system is composed of a fan and a connecting pipe, which is convenient for management. The main basis of the system is: if the production process and running time are the same, it is recommended to divide it into one system. If the operating parameters and air handling requirements are the same, it is recommended to divide them into one system. It is not recommended that the exhaust fan be close to the exhaust point, which is a small system away, which will increase the resistance of the exhaust system.
2.通风管道材料的选择
2. Selection of ventilation duct materials
通风管道的材料主要有钢板、金属软管、塑料和橡胶软管、纤维板、胶合板、石膏板、UPVC塑料板、砖和混凝土等。钢板是通风管道常用的材料，主要是因为它具有耐腐蚀和耐高温的特性，加工、制造、安装都非常方便。一些通风管道在技术上需要经常移动。此类通风管需要由柔性材料制成，如金属软管、塑料软管和橡胶软管。UPVC塑料板表面光滑，加工方便，但不耐高温。适用于有腐蚀的工业通风和排气系统。
The materials of ventilation pipes mainly include steel plate, metal hose, plastic and rubber hose, fiberboard, plywood, gypsum board, UPVC Plastic board, brick and concrete. Steel plate is a common material for ventilation pipes, mainly because it has the characteristics of corrosion resistance and high temperature resistance, and it is very convenient for processing, manufacturing and installation. Some ventilation ducts technically need to be moved frequently. Such ventilation pipes need to be made of flexible materials, such as metal hose, plastic hose and rubber hose. UPVC Plastic board has smooth surface and convenient processing, but it is not resistant to high temperature. Suitable for corrosive industrial ventilation and exhaust systems.
3.通风管道截面形状的选择
3. Selection of section shape of ventilation duct
通风管的截面形状一般分为矩形和圆形。当横截面积相同时，圆形通风管不仅阻力小、强度高，而且节约管材。圆形通风管，直径小，制造容易，保温更方便。然而，矩形通风管比圆形通风管容易制造，布局也比圆形通风管简单。在正常情况下，当通风管的横截面较小，管内流量较大时，应采用圆形通风管。当风道截面较大时，应采用矩形风道，充分利用建筑空间。矩形风管，高送风比接近1.效果较好，既可节省运行能耗，又可节省投资。
The section shape of ventilation pipe is generally divided into rectangular and circular. When the cross-sectional area is the same, the circular ventilation pipe not only has low resistance and high strength, but also saves pipes. Circular ventilation pipe, small diameter, easy to manufacture and more convenient for heat preservation. However, rectangular ventilation pipes are easier to manufacture than circular ventilation pipes, and the layout is simpler than circular ventilation pipes. Under normal circumstances, when the cross section of the ventilation pipe is small and the flow in the pipe is large, the circular ventilation pipe shall be used. When the section of air duct is large, rectangular air duct shall be adopted to make full use of building space. Rectangular air duct, high air supply ratio close to 1 The effect is good, which can not only save operation energy consumption, but also save investment.
4.通风管道布置图
4. ventilation duct layout
通风管道的布局直接关系到通风系统的总体布局。与其他密切配合，既协调美观，又符合总图的规定。如果排气管上有多个排气点，则可以将支管连接到大段歧管上。通风管道布置应尽可能平坦，以避免局部管道安装的复杂性。如果输气管道中含有液滴，应在通风管道上设置坡道，在通风管道的下端应设置密封水管，以便于排除渗出物。通风管道上应安装调节和测量装置，以便于系统的运行控制。
The layout of ventilation duct is directly related to the overall layout of ventilation system. Closely cooperate with others, which is not only harmonious and beautiful, but also in line with the provisions of the general drawing. If there are multiple exhaust points on the exhaust pipe, the branch pipe can be connected to a large section of manifold. The layout of ventilation ducts shall be as flat as possible to avoid the complexity of local pipeline installation. If the gas transmission pipeline contains droplets, a ramp shall be set on the ventilation pipeline, and a sealed water pipe shall be set at the lower end of the ventilation pipeline to facilitate the removal of exudates. Regulating and measuring devices shall be installed on the ventilation duct to facilitate the operation control of the system.
5.通风管道的保温
5. Insulation of ventilation duct
在通过通风管道输送空气的过程中，热量和冷却能力的损失较大，并且空气温度应保持基本恒定，因此有必要保持通风管道的绝缘。
In the process of conveying air through the ventilation duct, the loss of heat and cooling capacity is large, and the air temperature should be kept basically constant. Therefore, it is necessary to maintain the insulation of the ventilation duct.
The above is the detailed introduction of Jinan ventilation duct. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service http://www.jntfgd.com
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