A gas-electric linkage emergency cut-off control device for liquefied petroleum gas storage tanks

Abstract

The invention discloses a pneumoelectric-linked emergency switching-off control device of a liquefied petroleum gas storage tank. The pneumoelectric-linked emergency switching-off control device is characterized by comprising a circuit control system electrically connected with a hydrocarbon pump and a liquefied gas compressor, and a pneumatic control system controlled by an electromagnetic valve, wherein the pneumatic control system is connected with a pneumatic valve through a pipeline; and the electromagnetic valve is electrically connected with the circuit control system. The pneumoelectric-linked emergency switching-off control device has advantages in three aspects as follows: I, the emergency switching-off time is greatly shortened; II, compared with an oil pipeline, a gas pipeline has the advantages that the safety is improved to a relatively large extent, and the situations of unsmooth flow or blocking are avoided; and III, the cost is low, only with a bottle of 40 L of nitrogen, the pipeline pressure of the gas pipeline can be maintained for a quite long time, nitrogen does not corrode the pipeline, and the maintenance cost is relatively low.

Description

technical field [0001] The invention relates to an emergency cut-off system for a valve of a petroleum gas storage tank, in particular to a gas-electric linkage emergency cut-off control device. Background technique [0002] In order to deal with emergencies, traditional liquefied petroleum gas stations generally use hydraulic emergency shut-off valves to cut off the source of gas and liquid phases. The hydraulic emergency shut-off valve is used in conjunction with a long-distance hand-operated oil pump. It uses hydraulic control to open and close the valve, so that the valve cylinder is automatically depressurized to achieve the purpose of closing. [0003] However, the use of hydraulic emergency shut-off valves has certain defects, and there are the following safety hazards: First, the valve core, valve sleeve, valve body and other parts are easy to wear and deform, the spring is easy to fatigue, and the parts are easily corroded by acidic substances in the hydraulic oil. ...

AI Technical Summary

Problems solved by technology

[0003] However, the use of hydraulic emergency shut-off valves has certain defects, and there are the following safety hazards: First, the valve core, valve sleeve, valve body and other parts are easy to wear and deform, the spring is easy to fatigue, and the parts are easily corroded by acidic substances in the hydraulic oil. ; Second, the closing time of the valve is relatively long, and the general response time is nearly 10s, which is too long for a sudden leakage event; Third, the hydraulic oil in the oil pipeline is greatly affected by the environment, especially in winter, which is easy to freeze. Changes, once the viscosity of the oil is too high to cause poor flow or even block the pipeline, the hydraulic emergency shut-off valve will take longer to close or even fail to close when an emergency occurs

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