An automatic liquid injection throttle valve with anti-icing blockage provided with a liquid reservoir

Abstract

The invention belongs to the field of prevention and control of natural gas hydrate in pipeline transportation, in particular an automatic liquid injection throttling valve provided with a liquid reservoir to prevent ice blockage. Including valve body, valve stem and valve disc, there is a valve cavity in the valve body, the valve stem extends into the valve cavity, the valve disc is connected to the bottom end of the valve stem, and the handwheel is connected to the top end of the valve stem. It is characterized in that: There is a liquid storage tank, the shape of the liquid storage tank is an annular column, there is a Laval nozzle in the liquid storage tank, the lower end of the valve stem is connected with the Laval nozzle, and the lower end of the Laval nozzle is connected with the valve disc; the throttle valve The inlet leads to a high-pressure hose, and the outlet of the high-pressure hose is connected with a gate valve; one end of the high-pressure hose is connected to the valve stem through a ball joint; the other end is connected to the liquid injection port. The invention utilizes the Venturi principle to inject hydrate inhibitors into oil and gas pipelines to prevent or delay the nucleation, growth and accumulation of hydrates under the condition of rapid airflow changes, so as to prevent ice blockage in pipelines and ensure pipeline safe operation.

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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