High-temperature, high-pressure and high-flow-rate moisture environment corrosion simulation loop system

Abstract

The invention discloses a high-temperature, high-pressure and high-flow-velocity H2S / CO2 moisture environment corrosion simulation loop system. The loop system comprises a high-temperature and high-pressure kettle and a loop pipeline; an inlet and an outlet of the loop pipeline are communicated with the high-temperature and high-pressure kettle to form a loop system; the loop pipeline comprises ahigh-flow-velocity test section and a low-flow-velocity test section, and the high-flow-velocity test section is close to the gas phase outlet end of the high-pressure and high-temperature kettle; andaxial flow fans, Laval tubes with heating coils, gas flowmeters, corrosion probes, thermocouples, thermoelectric refrigeration devices, corrosion monitoring sections and sample mounting sections arearranged in the high-flow-rate test section and the low-flow-rate test section. The simulation loop system can accurately simulate the real corrosion environment in the submarine natural gas pipeline,such as temperature, pressure, flow velocity, pipeline top condensation and the like, and has the functions of corrosion electrochemical monitoring and physical coupon mounting; and the method has important significance for researching the corrosion law and mechanism of the submarine pipeline material and evaluating the applicability of the anti-corrosion agent.

Description

technical field [0001] The invention relates to a corrosion simulation test device, in particular to a high temperature, high pressure, high flow rate H 2 S / CO 2 The wet gas environment corrosion simulation loop system belongs to the field of research on the law and mechanism of material corrosion in high-acid gas fields, and the applicability evaluation of anti-corrosion agents. Background technique [0002] With the development of the energy industry and the continuous improvement of environmental protection requirements, natural gas has become the main energy supply in my country. However, according to the geological structure, my country's natural gas resources are mainly formed by marine deposits. Therefore, natural gas not only contains corrosive CO 2 Gas, also contains highly corrosive and biologically toxic H 2 S gas makes the gathering and transportation pipelines of natural gas fields face a serious risk of corrosion failure. Among them, due to the particulari...

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Problems solved by technology

At the same time, the loop is an equal-diameter loop, so when simulating a high flow rate, the gas resistance increases sharply, which not only greatly increases the power consumption of the air pump, but also causes the temperature of the gas in the loop to rise (frictional resistance generates heat).

And the gas directly enters the test section after passing through the elbow, the gas flow state is chaotic, and it is difficult to ensure that different batches of tests have the same flow state

In addition, there is no local refrigeration device in the test section, so the simulation of corrosion on the top of the submarine pipeline cannot be realized

[0005] Therefore, in view of the characteristics of internal corrosion conditions of submarine natural gas pipelines and the limitations of the test capabilities of existing loop corrosion simulation equipment, it is urgent to provide a H 2 S / CO 2 Corrosion loop experimental device in wet environment, in order to provide equipment support for the research on the corrosion law and mechanism of sea pipe materials and the applicability evaluation of anti-corrosion agents

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