Pipeline type steam filter screen with double-funnel structure

Abstract

The invention relates to a pipeline type steam filter screen with a double-funnel structure, which can guarantee the whole flow area and has the characteristics of being convenient to assemble and disassemble, simple in structure and low in cost. According to the technical scheme, the pipeline type steam filter screen is characterized by comprising a funnel-shaped outer net and a funnel-shaped inner net, wherein the diameter of the outer net is gradually reduced from the bottom end to the top; the bottom end of the outer net is provided with a flange ring, and a mouth part on the top of the outer net is connected with the top of the inner net; the inner net extends into the outer net downward; and the diameter of the inner net is gradually reduced from the top to the bottom end.

Description

technical field [0001] The invention relates to a steam filtering device, in particular to a steam turbine steam filter suitable for various low-pressure large pipelines. Background technique [0002] The impurities in steam come from the source of steam generation and the circulation process in the pipeline. Steam filter is a common device used to filter steam impurities. It is currently widely used in the field of steam turbines. It is used to protect steam turbine control valves, rotors, A necessary device for important components such as moving and stationary blades. [0003] The steam turbine is a high-efficiency, high-precision prime mover. Therefore, compared with conventional filters, in addition to considering the normal filtering function, it is relatively important to consider the pressure drop caused by the filter as much as possible. Therefore, a sufficient flow area must be ensured; in addition, when used in industrial steam turbines, due to variable operating...

AI Technical Summary

Problems solved by technology

The characteristic of this kind of winding filter is that when it is used in small pipelines, its structure is relatively compact and its safety is high, and it is suitable for steam turbines above medium pressure; but if the pipeline is large in size, it is difficult to wind the corrugated steel belt. The middle part of the finished filter screen is easy to loose. Second, when the pipe specification is larger than DN350 pipe, the flow area of ​​the filter screen will not meet the standard requirement of more than 2 times the flow area. The inspection and disassembly work is more difficult

[0006] At present, due to cost-effective considerations and the increase of energy-saving and emission-reduction projects, the number of low-quality, large-pipe steam-flow steam turbines is gradually increasing every year. The conventional filter structure in the past cannot meet the requirements, and a new steam filter needs to be designed. network to meet production needs

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