排烟罩是装在烟气出口处的装置，用于减少倒风对燃烧器燃烧性能影响;有利于排烟及烟道阻塞时方便烟气逸出。
The smoke exhaust hood is a device installed at the flue gas outlet to reduce the influence of downdraft on the combustion performance of the burner; It is conducive to smoke exhaust and smoke escape when the flue is blocked.
二、排烟罩的分类:
2、 Classification of smoke hoods:
排烟罩分为商用排烟罩和家用排烟罩。商用排烟罩分普通烟罩和运水烟置，家用的分顶吸烟罩和侧吸烟置。小编在这里先带领大家认识一下商用烟置中的普通排烟置。
The smoke exhaust hood is divided into commercial smoke exhaust hood and household smoke exhaust hood. Commercial smoke hoods are divided into ordinary smoke hoods and water carrying smoke hoods, and household smoke hoods are divided into top smoke hoods and side smoke hoods. Xiao Bian will first introduce you to the common smoke exhaust devices in commercial smoke exhaust devices.
这种排烟罩是由罩体和罩盖上下两部分构成，罩体由三个平面组成，罩盖由前、后、左、右四个平面(或称挡板)构成一个锥体。该排烟罟是饭店酒店学核食堂等后同更堂用的一种集油烟罩，苦体水平投影面为长方形的。横载面似半边的椭圆形。长度根据灶具的数量和摆放长度决定，高度为550mm，宽度一般在1250mm，前沿带送风装置的总宽为1500mm左右。置体内一侧以60°的斜度装有迷宫式过滤油网，有一定的油烟过滤能力。该排烟罩大小可根据现场情况量身定制，材质不锈钢和白铁皮居多。
The smoke exhaust hood is composed of the hood and the upper and lower parts of the hood. The hood is composed of three planes, and the hood is composed of four planes (front, rear, left and right, or baffle) to form a cone. The smoke exhaust hood is a kind of oil collecting hood used in the same hall as Xuehe Canteen in hotels, etc. The horizontal projection surface of the bitter body is rectangular. The transverse load surface is like an ellipse on half side. The length is determined according to the number and placement length of the cooker, the height is 550mm, the width is generally 1250mm, and the total width of the front air supply device is about 1500mm. Labyrinth oil filter screen is installed on one side of the housing with a 60 ° slope, which has a certain oil smoke filtering capacity. The size of the hood can be customized according to the site conditions, and the materials are mostly stainless steel and white iron sheet.
三、厨房油烟排风量的确定
3、 Determination of exhaust air volume of kitchen lampblack
(1)按换气次数确定排风量。各家厨房差别较大，厨房面积与厨具、炉灶的数量不成正比，同样灶的产生的污染物和热量也差别很大。实际上厨房通风并非是通风，按换气次数设计风量会有很大的误差
(1) Determine the exhaust air volume according to the number of air changes. Different kitchens are quite different. The kitchen area is not proportional to the number of kitchenware and stoves, and the pollutants and heat generated by the same stoves are also very different. In fact, the kitchen ventilation is not comprehensive ventilation, and there will be a large error in the design of air volume according to the number of air changes
(2)按污染物散发量的多少设计。排风量GB18483-2001饮食业油烟排放标准规定每个灶头需风量2000m3/h。
(2) It is designed according to the amount of pollutant emission. The environmental protection GB18483-2001 cooking fume emission standard stipulates that each stove needs 2000m3/h.
(3)以烟罩的大小来确定风量。以烟罩下沿和灶台之间的进风面积和进风速度的乘积来计算风量较为合适。排风量可按下式计算:G=3600L(h2-h1)Vx.m3/hL
(3) The air volume is determined by the size of the hood. It is appropriate to calculate the air volume by the product of the air inlet area and air inlet velocity between the lower edge of the hood and the hearth. The exhaust air volume can be calculated as follows: G=3600L (h2-h1) Vx.m3/hL
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