DC7000排污阀 DC7000 blowdown valve
高温高压锅炉排污阀广泛用于连续节流控制或者锅炉水的间断排放，是专门针对锅炉水排放工况的高压差、高流速、冲刷严重等特点特殊设计的产品，分为直通式、角式、串联式和Y型4种结构。套筒导向多级降压结构以及阀座出口文丘里管的设计能够有效控制出口流速，表面硬化处理能有效延长使用寿命。
高温高压锅炉排污阀标准结构为手动控制，也可以根据要求选用 气动和电动控制，气动控制配以电磁阀、气控阀、快速排放阀等附件可实现快速切断，切断时间为1S、2S、3S、4S等。
标准产品
形式：直通式、角式、串联式和Y型
规格：DN20 DN25 DN40 DN50 DN65 DN80
公称压力：ANSI 150 – ANSI 2500
额定行程：25 40 50 60mm
流体温度：-20℃-566℃
连接形式：承压焊SW、对焊BW、法兰式Flanged
流量特性：线性LINEAR、ON – OFF
执行机构：手动、气动、电动
漏等级：0泄漏
High temperature and high pressure boiler blowdown valve is widely used for continuous throttling control or intermittent discharge of boiler water. It is a product specially designed for the characteristics of high pressure difference, high flow rate and severe erosion of boiler water discharge conditions. It is divided into straight-through and angle-type. , Tandem and Y-type 4 structures. The sleeve-oriented multi-stage pressure reducing structure and the design of the valve outlet venturi tube can effectively control the outlet flow rate, and the surface hardening treatment can effectively extend the service life.
The standard structure of the high-temperature and high-pressure boiler blowdown valve is manual control. Pneumatic and electric control can also be selected according to requirements. Pneumatic control is equipped with accessories such as solenoid valve, air control valve, quick discharge valve, etc. to achieve fast cut-off. The cut-off time is 1S, 2S, 3S. , 4S, etc.
Y型
standard product
Form: straight-through, angle, tandem, and Y
Specification: DN20 DN25 DN40 DN50 DN65 DN80
Nominal pressure: ANSI 150 – ANSI 2500
Rated stroke: 25 40 50 60mm
Fluid temperature: -20 ℃ -566 ℃
Connection form: SW, BW, flanged
Flow characteristics: linear LINEAR, ON-OFF
Executive: manual, pneumatic, electric
Leakage level: 0 leaks
高压锅炉排污阀分类 Classification of high pressure boiler blowdown valve
连续排污阀
主要用于锅炉水的连续排放，目的是为了控制高压锅炉水中的溶解化学物的含量，防止锅炉水饱和后产生溶解盐，为了再循环利用，排出的高压锅炉水通常会排放到闪蒸罐中用于其他低压蒸汽的利用，连续排出的锅炉水也可直接用于检测水中的化学成分含量。
Continuous blowdown valve
It is mainly used for the continuous discharge of boiler water. The purpose is to control the content of dissolved chemicals in high-pressure boiler water and prevent the generation of dissolved salts after the boiler water is saturated. For recycling, the discharged high-pressure boiler water is usually discharged into the flash tank. For the use of other low-pressure steam, the continuously discharged boiler water can also be directly used to detect the chemical content of the water.
间断排污阀
间断排污阀分为底部排污阀和吹扫排污阀，底部排污阀通常直接安装于锅炉的底部，主要利用锅炉自身的压力来定期排放锅炉底部的颗粒、污垢等沉积物，防止造成管道的堵塞等；吹扫排污阀主要用于锅炉管线上堆积固体颗粒等快速吹扫排放以及锅炉冷凝水的排放等。通常使用Y型结构，流通性好，不易堆积固体颗粒。
Intermittent blowdown valve
Intermittent blowdown valve is divided into bottom blowdown valve and purge blowdown valve. Bottom blowdown valve is usually installed directly on the bottom of the boiler. It mainly uses the pressure of the boiler to regularly discharge particles, dirt and other deposits on the bottom of the boiler to prevent blockage of pipes ; Purge blowdown valve is mainly used for quick purge and discharge of solid particles accumulated on the boiler pipeline and discharge of boiler condensate. The Y-type structure is usually used, which has good fluidity and is not easy to accumulate solid particles.
高压锅炉排污阀优点
在石油石化以及电力锅炉中水排污与排放的重要性往往被忽视了，而不正确的排放会造成能源的浪费、热量损失以及增加额外的化学处理费用等，另外排出去的锅炉水与锅炉内的水具有相同的温度和压力，可以再循环应用于其它锅炉的工况中。锅炉排污阀的优点如下：
大大缩小维修与维护的费用
自动控制可以大大缩小人力成本
可以得到更洁净和高效的蒸汽
避免资源浪费，缩小操作成本
能源损失最小化，每年可以节省至少2%的能量损耗
Advantages of high pressure boiler blowdown valve
The importance of water drainage and emissions in petroleum and petrochemical and power boilers is often overlooked. Incorrect emissions will cause waste of energy, heat loss, and increase in additional chemical treatment costs. In addition, the discharged boiler water and The water has the same temperature and pressure and can be recycled and used in other boilers. The advantages of boiler blowdown valve are as follows:
Significantly reduce repair and maintenance costs
Automatic control can greatly reduce labor costs
Get cleaner and more efficient steam
Avoid waste of resources and reduce operating costs
Minimized energy loss, saving at least 2% of energy loss per year
角式 直通
高压锅炉排污阀实例分析
压力温度参数
压力等级在ANSI600以下 一般P1=47bar.g P2=4~5bar.g T=285℃
压力等级在ANSI1500以下 一般P1=140bar.g P2=4~5bar.g T=285℃
工况危害
由于高压降，产生闪蒸现象，流量会膨胀（出口流速增加），
流体冲刷十分严重。
由于可能产生的高流速震动，阀杆容易折断。
高压差情况下容易产生气蚀，造成内件冲刷十分严重。
高温情况下材料容易失效，使用寿命短。
采用传统截止阀阀内件现场维护不方便。
传统截止阀阀内件冲刷严重，使用寿命短。
阀门操作需要快速关闭。
结构特点
采用角式阀体结构，阀座采用文丘里结构，在出口处增加阀门的流通截面积，降低流速，增加能量损耗，阀座表面硬化处理，延长使用寿命
阀杆阀芯采用整体型设计，阀芯导向改成套筒导向，能承受更高压差
阀芯采用cascade多级降压式结构，有效避免气蚀
285℃以上阀门材料采用F11/F22或者F91来有效防止高温情况下阀门的材料失效情况
阀内件采用快拆式可维护性设计，现场维护十分方便。
阀内件采用套筒导向型结构，套筒硬化处理，阀芯堆焊STL合金，阀座堆焊硬质合金，大大延长使用寿命。
将手动改为自动控制，可以快速启闭。
阀芯采用cascade多级降压结构
