Suction-condensing steam turbine
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Could everyone help me analyze this? For a extraction-condensing steam turbine, I’m interested in the impact of extraction steam on the turbine’s load; it can also be understood as the effect of using extraction steam on the turbine. What would happen if extraction steam were not used? Our steam intake is 130 tons per hour, while the steam extraction volume is 60 tons per hour. Once, steam extraction was not used; when operating at full load afterward, the turbine blades were damaged. However, we saw that other plants continued to operate at full load without using steam extraction. So let’s share our opinions on the relationship between these two factors.
It’s not professional, but some machines do have a full condensation mode. Does your machine support this mode? It’s also possible to operate mine without pumping out air. It seems to depend on the design of the machine. As a supplementary note, the machine I have here is from Hangqi.
I also have a Hangqi machine; can it be analyzed in terms of speed and load? Upstairs?
I have constant-speed control here; the load on the turbine is determined by the opening degree of the high-pressure valve. Compare this with the designed load of your turbine under full condensation conditions – did it exceed that designed load at that time? The turbine load is determined by the power of the compressor; by appropriately controlling the exhaust pressure and volume of the compressor, the turbine will automatically adjust the opening degree of the high and low pressure valves based on the control system. Furthermore, from a process perspective, whether the steam turbine is vented or not should have little impact; the main causes of bearing damage are still overload and design flaws. Due to my limited experience with steam turbines, the above remarks are for reference only; I hope they will be helpful to you.
This post was last edited by sft1974 on 2010-8-27 at 19:56. It depends on the criteria used in the design of the steam turbine; generally, for a extraction-condensing steam turbine, it is not allowed to operate at full load under pure condensing conditions – it can only reach around 80% of full load. When extraction is employed and the turbine operates according to the designed conditions, it can then reach full load, that is, the designed load. However, there are also special cases: in some areas, in order to enable connection to the power grid, the power generation companies may not allow the use of condensing turbines, and instead require turbines to be designed as extraction-condensing types, meaning that extraction is generally not utilized during operation; this allows the turbines to operate at full capacity. The main difference lies in the blades and partitions. Specifically, it is necessary to consult the turbine manufacturer.
Our unit is also from Hangzhou Motor, but it hasn’t been put into operation yet. I would be extremely grateful if that person could send me a commissioning plan and operating procedures. 445852649@qq.com
Clay firing should have no relation to whether exhaust steam is used. The use of extraction steam can affect axial displacement and differential expansion, and may have an impact on the load on the shaft bearings.
Agree with the person above. If your machine isn’t designed for full-condensation conditions, it won’t get damaged if you don’t use it in that mode. Does no one in your factory know? It’s too wasteful. Your machines must be quite large as well.
Reply to 8# zhangzsh: I agree; the analysis makes sense. The power of that small turbine is only 2.5W, haha