System and method for preventing overpressure of inlet of piston type compressor

Abstract

The invention discloses a system and a method for preventing overpressure of an inlet of a piston type compressor. The system comprises a branch tee, a connecting pipeline, a pressure adjusting valve, a check valve and a pressure control loop, wherein the branch tee is arranged on a pipeline between an air inlet ball valve of the compressor or a one-inlet air cooler and the inlet of the compressor or a first-stage air inlet buffer of the compressor, the connecting pipeline is connected to the branch tee, and the pressure adjusting valve and the check valve are sequentially arranged on the connecting pipeline; the check valve is further connected to an emptying, torch or recovery system; the pressure control loop comprises a pressure sensor, a transmitter and a hard wire, wherein the pressure sensor is arranged on a pipeline between the one-inlet air cooler at the inlet of the compressor and the first-stage air inlet buffer and is used for detecting the pressure of the inlet of the compressor, the transmitter is connected to the pressure sensor, and the hard wire is connected to the pressure adjusting valve and a PLC; and the pressure of each stage of the compressor is connected to the emptying, torch or recovery system through a newly-added pressure release valve instead of being released to a one-way switch vale and / or a three-way switch valve of the inlet of the compressor through corresponding outlet pipelines of rows of air coolers.

Description

technical field [0001] The patent of the present invention relates to all technical fields where piston compressors are used to boost pressure, and the inlet does not have enough buffer space to prevent overpressure at the inlet, and specifically relates to a system and method for preventing overpressure at the inlet of a piston compressor. Background technique [0002] In engineering, fluid transportation is an important operating unit, especially in the energy, power and chemical industries. For the delivery of compressible fluids, piston compressors are widely used because of their low loss, high efficiency and wide pressure range. [0003] In engineering design, the piston compressor is generally used as a complete package, and the compressor manufacturer completes the design of the import and export and interstage systems, the compressor body, the control interlock system and logic, and all auxiliary equipment. As far as the import and export, interstage system and par...

AI Technical Summary

Problems solved by technology

[0007] 2. When the compressor is in the shutdown state, the internal leakage of the cylinder unloading valve and the failure or internal leakage of the return air load regulating valve will cause the inlet to overpressure

[0008] 3. Emergency shutdown requires manual work to release pressure on site, which increases labor intensity. In addition, in emergency shutdown caused by fire, leakage, etc., operators cannot go to the site to open valves to release pressure, or greatly increase the risk of operation.

[0009] 4. The overpressure at the inlet causes the safety valve to jump frequently, which leads to internal leakage of the safety valve, and even causes safety accidents resulting in property loss and casualties

Manual monitoring and regular pressure relief will also greatly increase the labor intensity of on-site operators

[0010] 5. If the compressor inlet is designed to have the same pressure level as the outlet, although the problem of inlet overpressure is solved, the cost of inlet pipelines, valves, fittings, buffer tanks, and air coolers will increase. If the pressure difference between inlet and outlet is too large , such as 150 pounds to 600 pounds, then the cylinder will change from casting to forging, and the cost of the entire compressor will increase by at least 20%

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