水霧噴頭是在一定壓力的作用下，利用離心或撞擊原理將水流分解成細小水霧滴的噴頭，分類離心霧化較高壓力，良好的電絕緣性，通道小易堵塞，一般是高速噴頭，撞擊較低壓力，水霧粒徑比較大，一般是低速噴頭，設備整體冷卻保護，火災區附近的建、構筑物連續噴水進行冷卻。下面川消小編來講講水霧噴頭主要性能參數以及布置要求。

Water mist nozzle is a nozzle that uses the principle of centrifugation or impact to decompose water flow into small water mist droplets under a certain pressure. It is classified as centrifugal atomization with high pressure, good electrical insulation, small channels and easy blockage. It is generally a high-speed nozzle, with lower impact pressure and larger water mist particle size ratio. It is generally a low-speed nozzle, and the equipment is cooled and protected as a whole. Buildings and structures near the fire area are continuously sprayed with water for cooling. Next, let's talk about the main performance parameters and layout requirements of the water mist nozzle.

水霧噴頭主要性能參數

Main performance parameters of water mist nozzle

工作壓力：通常噴頭的工作壓力越高，其水霧滴粒徑愈小，霧化效果越好，滅火和冷卻的效率也就越高用于滅火的水霧噴頭，其工作壓力應為0.35Mpa—0.8Mpa ，用于防護冷卻的水霧噴頭，其工作壓力應為0.2Mpa—0.6Mpa.

Working pressure: The higher the working pressure of the nozzle, the smaller the droplet size of the water mist, the better the atomization effect, and the higher the efficiency of fire extinguishing and cooling. The working pressure of the water mist nozzle used for fire extinguishing should be 0.35Mpa -0.8Mpa. The working pressure of the water mist nozzle used for protective cooling should be 0.2Mpa -0.6Mpa

霧化角：水霧噴頭常見的霧化角有45°、60°、90°、120°、150°等五個規格

Atomization angle: There are five common specifications of atomization angles for water mist nozzles, including 45 °, 60 °, 90 °, 120 °, and 150 °

流量系數：水霧噴頭的流量系數K為16102，水霧噴頭K系數由水霧噴頭生產廠家自己確定

Flow coefficient: The flow coefficient K of the water mist nozzle is 16 to 102, and the K coefficient of the water mist nozzle is determined by the manufacturer of the water mist nozzle

有效射程：指噴頭水平噴射時，水霧達到的高點與噴口之間的距離，水霧錐是指在水霧有效射程內水霧形成的圓錐體。同一水霧噴頭，霧化角小，射程則遠，反之則近。在有效射程范圍內的水霧強度能夠達到設計要求。可保證滅火或防護冷卻要求，因此，水霧噴頭與保護對象的有效距離不應大于水霧噴頭的有效射程

Field of fire: refers to the distance between the high point of the water mist and the nozzle when the nozzle sprays horizontally. The water mist cone refers to the cone formed by the water mist within the Field of fire. The same water mist nozzle has a small atomization angle and a long range, while the opposite is true. The water mist intensity within the Field of fire can meet the design requirements. It can meet the requirements of fire extinguishing or protective cooling. Therefore, the effective distance between the spray nozzle and the protected object should not be greater than the Field of fire of the spray nozzle

水霧滴平均直徑：壓力越大，霧滴平均直徑越小。水霧滴大小直接影響滅火效果 。不應太小：小于300時，達不到保護對象的表面。不應太大：太大會影響水霧的氣化效果，使水噴霧的冷卻和窒息作用降低粒徑合理的范圍

Average diameter of water droplets: The greater the pressure, the smaller the average diameter of droplets. The size of water mist droplets directly affects the fire extinguishing effect. It should not be too small: when it is less than 300, the surface of the protected object cannot be reached. Not too big: too big will affect the gasification effect of water mist, so that the cooling and suffocation effect of water spray can reduce the reasonable range of particle size

水霧噴頭布置要求

Layout requirements for water mist nozzles

水霧噴頭

spray nozzle 

01

01

保護對象的水霧噴頭數量應根據公式（1）和公式（2）計算確定

The number of water mist nozzles for protecting objects should be calculated and determined according to formulas (1) and (2)

02

02

噴頭的布置應使水霧直接噴射和完全覆蓋保護對象

The arrangement of the nozzle should ensure that the water mist is directly sprayed and completely covers the protected object

03

03

噴頭與保護對象之間的距離不得大于水霧噴頭的有效射程

The distance between the sprinkler and the protected object shall not be greater than the Field of fire of the spray nozzle

04

04

噴頭、管道與電氣設備帶電（裸露）部分的凈距應符合現行有關標準的規定

The safety clearance between nozzles, pipelines, and live (exposed) parts of electrical equipment should comply with the current national standards

保護儲罐、球罐

Protecting storage tanks and spherical tanks

01

01

當保護對象為甲、乙、丙類液體和可燃氣體儲罐時，水霧噴頭與保護儲罐外壁之間的距離不應大于0.7M

When the protected object is Class A, B, C liquid and combustible gas storage tanks, the distance between the water mist nozzle and the outer wall of the protected storage tank should not exceed 0.7M

02

02

當保護對象為球罐時，水霧噴頭的布置尚應符合下列規定：

When the protected object is a spherical tank, the arrangement of the water mist nozzle should also comply with the following regulations:

（1）水霧噴頭的噴口應朝向球心

(1) The nozzle of the water mist nozzle should face the center of the ball

（2）水霧錐沿緯線方向應相交，沿經線方向應相接

(2) The water mist cone should intersect along the latitude direction and connect along the longitude direction