Automatic flushing system of safety valve of fluid transportation pipe

Abstract

The invention discloses an automatic flushing system of a safety valve of a fluid transportation pipe, which is characterized in that the safety valve is connected on a transportation main pipe and connected with an accumulator through a flushing pipe; an automatic control valve is arranged on the flushing pipe; a displacement sensor is arranged on the safety valve and connected with the automatic control valve through a signal wire; the safety valve is also connected with a rear outlet pipe; the lower part of the accumulator is connected with a liquid inlet pipe and a flushing liquid discharging pipe in parallel; the liquid inlet pipe is communicated with a flushing liquid tank; a liquid supply pump and a liquid supply valve are arranged on the liquid inlet pipe; a flushing liquid discharging valve is arranged on the flushing liquid discharging pipe; a liquid level meter is arranged at the upper part of the accumulator and a pressure gauge is arranged at the top; the top of the accumulator is connected with a high-pressure gas supply pipe and a vent pipe in parallel; a gas supply valve is arranged on the high-pressure gas supply pipe; and a vent valve is arranged on the vent pipe.

Description

technical field [0001] The invention relates to a pipeline cleaning technology, in particular to an automatic flushing system for a fluid delivery pipeline safety valve, which is mainly suitable for high-pressure pipeline transportation of fluid containing solid particles. Background technique [0002] Leakage is a common failure in safety valve applications. There are many reasons for leakage, and when solid particles, crystals or coking accumulate on the sealing surface, it will often cause internal leakage of the valve. For example, in the direct coal liquefaction process, due to the presence of coal particles in the coal slurry, after the pressure relief of the spring safety valve, the remaining coal particles on the sealing surface will prevent the valve from closing, resulting in internal leakage. Effectively removing solid particles or particles on the sealing surface of the safety valve in the pipeline is the key to solving the problem of internal leakage of the saf...

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Problems solved by technology

[0005] However, the switching cleaning systems reported in the above literatures all have the following defects: that is, it is impossible to avoid the effective closing of the safety valve when the fluid contains solid particles, and it is impossible to avoid the extrusion of solid particles between the disc and the valve seat, which will still cause the safety valve valve to be closed. The wear of the disc and the valve seat will affect the inner seal of the safety valve, and eventually lead to the internal leakage of the delivery safety valve, which will affect the normal process operation

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