Ice blockage preventing automatic liquid injection throttling valve with liquid storage device

Abstract

The invention belongs to the field of pipeline transportation natural gas hydrate prevention and particularly relates to an ice blockage preventing automatic liquid injection throttling valve with a liquid storage device. The ice blockage preventing automatic liquid injection throttling valve comprises a valve body, a valve rod and a valve clack. The valve body is internally provided with a valve cavity. The valve rod stretches into the valve cavity. The valve clack is connected to the bottom end of the valve rod. A hand wheel is connected to the top end of the valve rod. The ice blockage preventing automatic liquid injection throttling valve is characterized in that the valve cavity is internally provided with the liquid storage box which is in an annular column shape; the liquid storage box is internally provided with a Laval nozzle; the lower end of the valve rod is connected with the Laval nozzle; the lower end of the Laval nozzle is connected with the valve clack; a high-pressure hose is led out of an inlet of the throttling valve; a brake valve is connected to an outlet of the high-pressure hose; one end of the tail end of the high-pressure hose is connected with the valve rod through a spherical joint; and the other end of the tail end of the high-pressure hose is connected with a liquid injection opening. According to the ice blockage preventing automatic liquid injection throttling valve with the liquid storage device, the Venturi principle is used, a hydrate inhibitor is injected into an oil and gas pipeline to prevent or delay nucleating, growing and gathering of hydrate under the condition that airflow changes rapidly, thus, ice blockage of the pipeline can be prevented, and safe operation of the pipeline is ensured.

Description

technical field [0001] The invention belongs to the field of prevention and control of natural gas hydrates in pipeline transportation. Here, it specifically refers to using the Venturi principle to inject hydrate inhibitors (including thermodynamic inhibitors and kinetic inhibitors) under conditions of rapid changes in air flow (such as when flowing through valves and turning). and anti-agglomeration agent) into oil and gas pipelines to prevent or delay the nucleation, growth and accumulation of hydrates. In this way, the ice blockage of the pipeline can be prevented and the safe operation of the pipeline can be ensured. Background technique [0002] In the oil and gas industry, natural gas hydrates will not only cause blockage of pipelines and valves, stop production, but even cause rupture of pipelines, leading to serious safety production problems. [0003] Sufficient free water and sufficient subcooling are required for the formation of gas pipeline hydrate ice blockag...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the risk of hydrate blockage of natural gas in the pipeline after it is throttled by a throttle valve. By using the Venturi principle, the compound hydrate inhibitor is automatically injected into the pipeline to develop a hydrate inhibitor that can The hydrate inhibitor is automatically injected into the throttle valve of the pipeline, which can effectively prevent ice blockage in the pipeline without affecting normal production

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