VMIVME-7614-133工控处理器模块库存

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VMIVME-7614-133工控处理器模块库存

抽汽和进汽图在将汽轮机的抽汽/进气蒸汽图编程控制，它必须具有交点A、B和C（参见图4-6）。
如果A点和B点已经存在，需要的转换是扩展
LP=0线和零抽汽和进汽流线，直到它们交叉或
相交（这是编程的C点）。如果点A不存在，则扩展
LP=100管线和零抽汽和进汽管线，直到：
交叉或相交是编程的点A。
如果B点和C点不存在，则必须修改地图以包含B点
&C.需要创建LP=0行。要创建LP=0行，必须：
了解通过汽轮机后端所需的小蒸汽流量。在里面
在我们的示例蒸汽图（图4-6）中，小所需流量为8000 lb/h（3629kg/h）。
手动85018V1 505E数字调速器
伍德沃德123
1.延长大提取线。参见图4-6。
2.延长零提取和进线。
3.找到涡轮机的小后端蒸汽流量（这将是C点的HP流动）。
4.标记零提取和进气流线与汽轮机的小后端蒸汽流量。该标记将为C点，用于：编程。
5.通过步骤4中创建的标记，绘制一条平行于LP=100线的线。
这将是您的LP=0管线或LP阀门关闭管线。6.标记大提取线与创建的LP=0的交点线这将是编程的B点。
控制需要A、B和C点来计算涡轮机的内部
压力比和极限。所需的十个值可从转换后的蒸汽图中获取。举例
使用图4-6中的蒸汽图，如下所示。
大功率值是S=100线与S轴交叉的负载
（在我们的示例中约为10496 kW）。
大HP流量值是HP=100线穿过HP轴的流量（约54000 lb/h；24494 kg/h）。
点A是P=0、extr/adm和LP=100线相交的位置（大功率@0EXTR/ADM＝约11625kW；大HP流量@0 EXTR/ADM=约62000磅/小时；28123kg/h）。
大吸入量=约20000磅/小时（9072千克/小时）。
点B是LP=0和P=100线相交的地方（小功率@MAX
提取=约1504kW；大抽汽时的小高压流量=约28000磅/小时；12701kg/h）。
点C是LP=0和零提取和进气流线相交的位置
（零提取/进入时的小功率=约-205 kW；小HP零提取/进入流量=约8000 lb/h；3629kg/h）。
另一个参数，小HP升程（%）也将设置为4000/54000=7.4%.Extraction & Admission Steam Map
Before a turbine’s extraction/admission steam map can be programmed into the
control, it must have the intersection points A, B, & C (refer to Figure 4-6).
If points A & B already exist, the only conversion necessary is the extension of
the LP=0 line and the zero extraction and admission flow line until they cross or
intersect (this is Point C for programming). If point A does not exist, the extension
of the LP=100 line and the zero extraction and admission flow line until they
cross or intersect is Point A for programming.
If points B & C do not exist, your map will have to be modified to include points B
& C. The LP=0 line will need to be created. To create the LP=0 line you must
know the minimum required steam flow through the back-end of the turbine. In
our example steam map (Figure 4-6) the minimum required flow was 8000 lb/h
(3629 kg/h).
Manual 85018V1 505E Digital Governor
Woodward 123
1. Extend the maximum extraction line. Refer to Figure 4-6.
2. Extend the zero extraction & admission line.
3. Find your turbine’s minimum back-end steam flow (this will be point C’s HP
flow).
4. Mark the intersection of the zero extraction & admission flow line and the
turbine’s minimum back-end steam flow. This mark will be Point C for
programming.
5. Draw a line parallel to the LP=100 line, through the mark created in step 4.
This will be your LP=0 line or LP valve closed line.
6. Mark the intersection of the maximum extraction line and the created LP=0
line. This will be Point B for programming.
Points A, B, and C are required by the control to calculate the turbine’s internal
pressure ratios and limits. The ten values needed can be taken from the converted steam map. An example
has been provided below, using the steam map in Figure 4-6.
The MAX POWER value is the load where the S=100 line crosses the s-axis
(about 10 496 kW in our example).
The MAX HP FLOW value is the flow where the HP=100 line crosses the HPaxis (about 54 000 lb/h; 24 494 kg/h).
Point A is where the P=0 extr/adm and LP=100 lines intersect (MAX POWER @
0 EXTR/ADM = about 11 625 kW; MAX HP FLOW @ 0 EXTR/ADM = about
62 000 lb/h; 28 123 kg/h).
MAX ADMISSION = about 20 000 lb/h (9072 kg/h).
Point B is where the LP=0 and P=100 lines intersect (MIN POWER @ MAX
EXTRACTION = about 1504 kW; MIN HP FLOW @ MAX EXTRACTION = about
28 000 lb/h; 12 701 kg/h).
Point C is where the LP=0 and zero extraction & admission flow lines intersect
(MIN POWER @ ZERO EXTRACTION/ADMISSION = about -205 kW; MIN HP
FLOW @ ZERO EXTRACTION/ADMISSION = about 8000 lb/h; 3629 kg/h).
An additional parameter, MIN HP LIFT (%), would also be set to 4000/54000 =
7.4%.