固定喷嘴

减温减压装置系列                                                                                                                        Temperature and pressure reducing device series

DCF固定喷嘴  DCF fixed nozzle

DCF型喷嘴常用于减温水流量低于DCA型最小可调值（CV值大约低于0.7）的场合。

DCF型喷嘴结构简单、经济，当用在喷水流量与蒸汽减温

调节范围要求不高（大约5：1）的场合时，可以替代DCA

型弹簧可调雾化喷嘴。

 

The DCF nozzle is often used in the occasion where the

temperature of the cooling water is lower than the minimum

adjustable value of the DCA type (the CV value is less than 0.7).

The DCF nozzle has a simple structure and is economical. When

 it is used in situations where the spray flow rate and steam

temperature adjustment range are not high (about 5: 1), it can

 replace the DCA spring adjustable nozzle.

技术特点：

尺寸 ：

DCFP型：－ 减温水连接端：1/2" -  1"（DN15 - DN25）

                － 蒸汽连接端：2" -  6"（DN50 - DN150）

DCFW型：－ 减温水连接端：1/2" -  1"（DN15 - DN25）

                 － 蒸汽连接端：1.1/2" -  4"（DN40 - DN100）

连接方式 ：

DCFP & DCFW 型：GB, HG, JB, ANSI, UNI, DIN法兰（DCFP型也可提供BW对焊式）

混合管道－BW对焊，同管道尺寸

压力等级 ：

减温水连接端：ANSI 150 - 1500, (PN16-250)

蒸汽连接端：ANSI 150 - 1500, (PN16-250)也可提供更高的压力等级。

流量 ： 可以利用DCF选型手册所列的Cv值按照通用公式计算。

            水的最大质量流量在任何情况下都不能超过蒸汽流量的25%.

设计型式 ： 减温水入口端与管道垂直（标准）：锻造一体式，由螺纹连接、止退垫片固定的DCF喷嘴。减温水入口端与管道平行（按需）：组焊结构，由锻件或卷制管焊接构成。

材质 ：

        本体：碳钢或Cr-Mo钢

        混合管道：同管道材质

 

Technical characteristics:

Size:

DCFP type:-Cooling water connection end: 1/2 "-1" (DN15-DN25)

-Steam connection: 2 "-6" (DN50-DN150)

DCFW type:-Cooling water connection end: 1/2 "-1" (DN15-DN25)

-Steam connection: 1.1 / 2 "-4" (DN40-DN100)

Connection method:

DCFP & DCFW type: GB, HG, JB, ANSI, UNI, DIN flange

(DCFP type can also provide BW butt welding type)

Mixed pipe-BW butt welding, same pipe size

Pressure Level :

Cooling water connection: ANSI 150-1500, (PN16-250)

Steam connection: ANSI 150-1500, (PN16-250)

Higher pressure levels are also available.

Flow: The Cv value listed in the DCF selection manual can be calculated according to the general formula.

The maximum mass flow of water must not exceed 25% of the steam flow under any circumstances.

Design type: The inlet end of the desuperheating water is vertical to the pipe (standard): a forged one-piece DCF nozzle that is fixed by a threaded connection and a backstop gasket.

The inlet end of the desuperheating water is parallel to the pipe (as required): a group welding structure, which is composed of forgings or rolled pipes.

Material:

Body: Carbon steel or Cr-Mo steel

Mixed pipe: same pipe material

该系列减温器使用DCF固定截面型雾化喷嘴，共有三种型号：

DCFP 型插入式，安装于法兰型管座上。

DCFC 型插入式，带喷水复合腔。

DCFW型对夹式。

 

This series of desuperheaters use DCF fixed section atomizing nozzles,

which are available in three models:

DCFP type plug-in type, mounted on flange type socket.

DCFC plug-in type with water spray compound cavity.

DCFW Wafer type.

 

DCF固定截面型喷嘴

DCF型喷嘴能提供非常精良的雾化度，类似于发动机雾化喷嘴（见图3）。喷嘴的截面积是固定的，当减温水流

量变小时，水流速和喷射流也减小。在喷嘴（2）上游装有一个螺旋装置（1）（特殊设计的喷嘴孔板），使水呈螺旋雾化状喷出，能部分补偿以上原因引起的雾化性能的降低，以保证某些场合可以接受的系统可调比。

DCF fixed section nozzle

DCF nozzles provide very fine atomization, similar to engine atomization nozzles (see Figure 3). The cross-sectional area of the nozzle is fixed.

When the amount becomes smaller, the water flow velocity and the jet flow also decrease. A spiral device (1) (specially designed nozzle orifice plate) is installed upstream of the nozzle (2), so that the water is sprayed in a spiral atomization manner, which can partially compensate for the decrease in atomization performance caused by the above reasons, in order to ensure some Occasionally acceptable system adjustable ratio.