A system and method for on-line monitoring of high temperature and high pressure steam dryness

Abstract

The invention belongs to the technical field of steam dryness detection. The invention discloses an online monitoring system and method for high temperature and high pressure steam dryness; In the steam generator, most of the water is converted into steam, and the steam and the remaining water enter the gas-liquid separator for gas-liquid separation. The separated steam overflows from the water outlet through the steam passage; part of the separated water passes through the furnace water passage from the outlet The water is discharged from the water outlet, and part of it is cooled by the condensation pipe and flows into the water outlet. The high-temperature and high-pressure measuring electrode detects the temperature of the water outlet and is discharged from the water outlet through the throttle valve and the heating pipe. The throttle valve can control the water flow of the outlet pipeline. The conductivity measuring instrument is connected with the high-temperature and high-pressure measuring electrodes of the water inlet and the water outlet to measure the conductivity of the water inlet and the water outlet respectively. The invention proposes a dryness detection method that is resistant to a high temperature of 450°C and can be measured on-line under a high-pressure environment of 35MPa.

Description

technical field [0001] The invention belongs to the technical field of steam dryness detection, and in particular relates to an online monitoring system and method for high-temperature and high-pressure steam dryness. Background technique [0002] At present, the closest existing technology: high-temperature steam displacement is an important development method in the development process of oil and gas fields, and it is also one of the key research objects of oil and gas field development tests; but the effects of steam with different steam dryness are very different in the development process. At present, the most commonly used high-temperature steam generator in the laboratory is the steam dryness control based on the thermal theory. However, the theoretical control of Rehan is a forward control method, which does not have the function of feedback control, and cannot achieve feedback adjustment of steam dryness. Laboratory steam development research differs from field ste...

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Problems solved by technology

[0005] (1) The heat exchange method is more dangerous, the analysis process is long and inefficient, and cannot be analyzed online

[0006] (2) The electrical conductivity of the capacitance method is affected by the size and distribution of the electrodes, so it is difficult to accurately measure the real dryness of the steam with a small flow rate, and the repeatability is poor

[0008] (4) The resistivity measurement electrodes on the market are all used at a temperature not exceeding 200°C and a pressure not exceeding 10Mpa, which is difficult to meet the needs of steam displacement experiments

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