Common applications of metal hoses in thermal power plants
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Author:佚名
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Published time: 2020-10-14
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Metal hose is an important connecting component in engineering technology, which is composed of corrugated flexible pipe, net sleeve and joint. my country has issued the national standard "General Technical Requirements for Corrugated Metal Hoses" (GB/T14525-93) in 1993.The metal hose is made of austenitic stainless steel material or materials according to user requirements. It has excellent flexibility, corrosion resistance, high temperature resistance (-235℃ ~ ＋450℃), high pressure resistance (maximum 32MPa). The pipeline can be connected in any direction to compensate for temperature and absorb vibration, reduce noise, change the direction of medium transportation, eliminate mechanical displacement between pipelines or between pipelines and equipment, etc. The double flange metal corrugated hose has displacement and vibration The flexible joints of various pumps and valves are particularly suitable.
Metal hose is an important connecting component in engineering technology, which is composed of corrugated flexible pipe, net sleeve and joint. my country has issued the national standard "General Technical Requirements for Corrugated Metal Hoses" (GB/T14525-93) in 1993.
The metal hose is made of austenitic stainless steel material or materials according to user requirements. It has excellent flexibility, corrosion resistance, high temperature resistance (-235℃ ~ ＋450℃), high pressure resistance (maximum 32MPa). The pipeline can be connected in any direction to compensate for temperature and absorb vibration, reduce noise, change the direction of medium transportation, eliminate mechanical displacement between pipelines or between pipelines and equipment, etc. The double flange metal corrugated hose has displacement and vibration The flexible joints of various pumps and valves are particularly suitable.
There are two types of corrugated pipes used in metal hoses, one is spiral corrugated pipe; the other is annular corrugated pipe.
Spiral corrugated pipe
Spiral corrugated pipe is a tubular shell with corrugations arranged in a spiral shape. There is a spiral angle between two adjacent corrugations, and all the corrugations can be connected by a spiral line.
Annular corrugated pipe
Annular corrugated pipe is a tube-shaped shell whose corrugations are in a closed circular ring shape. The waves are connected in series by ring corrugations. The metal hose is formed from seamless pipes or welded pipes. Restricted by the processing method, the length of a single tube is usually shorter than that of a spiral corrugated tube. The advantages of the annular bellows are good elasticity and low rigidity.
In thermal power plants, heavy oil or residual oil is often used as fuel. In order to make it burn more fully and exert the thermal effect, it must be heated and atomized. In the past, the pipes connecting the atomized nozzles generally used copper pipes. Because of their high bending stress and low load-bearing capacity, leakage caused by damage often occurred during use. In recent years, people have gradually adopted metal hoses to replace it, and have received good results. Metal hoses are generally used in oil burner nozzle oil pipes and coal-burning furnace ash water pipes.
Such metal hoses are used to be called furnace hoses. During their work, they are mainly affected by pressure pulsation and mechanical vibration. In addition, they are also affected by the temperature of the medium. Therefore, the designer should take corresponding measures. Countermeasures.
In the design of a large number of coal-fired furnaces, a metal hose of a certain length is connected in series to the ash-washing water pipe and its connecting pipeline extending into the furnace, which is a form of habit.
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