Alkalizer compounding device and method for inhibiting air cooling island vapor-liquid two-phase flow FAC

Abstract

The invention discloses an alkalizer compounding device and method for inhibiting air cooling island vapor-liquid two-phase flow FAC. The device comprises a medicine dissolving box, a medicine feedingpump, a heating device, a vapor-liquid separation device, a vapor exhaust pipe, a vapor phase collection device, an insoluble gas exhaust pipe and a vacuum pump which are sequentially communicated. The vapor-liquid separation device is composed of an alkalizer compound liquid spraying device, a liquid phase cooler and a liquid phase sampling device; the liquid phase cooler is provided with a cooling water inlet pipe, a cooling pipe and a cooling water outlet pipe; the vapor phase collecting device is composed of an alkalizer compound liquid vapor phase hole homogenizing device, a vapor phasecondenser, a demister and a vapor phase condensate sampling device; the vapor phase condenser is provided with a cooling water inlet pipe, a condensation pipe and a cooling water outlet pipe; the invention further discloses an alkalizer compounding method of the device. The types and dosages of the compound basifying agent can be adjusted at will according to actual needs so that vapor and liquidphases of the basifying agent are uniformly distributed, and flow accelerated corrosion caused by non-uniform distribution of the basifying agent in the vapor and liquid phases is prevented.

Description

technical field [0001] The invention belongs to the technical field of corrosion control, in particular to an alkalizing agent compounding device and method for suppressing air-cooled island vapor-liquid two-phase flow FAC. Background technique [0002] The air-cooled condenser (air-cooled island) of a large direct air-cooled unit has a huge area. Due to the unbalanced vapor-liquid distribution of the alkalizing agent entering the air-cooled island with the exhaust steam, the vapor-liquid two-phase flow inside the air-cooled island will flow during operation. The phenomenon of accelerated corrosion (FAC) is serious. According to statistics, the air-cooled units that have been in operation for 1 to 2 years have more than 10% thinning of the severely corroded parts of the air-cooled island. At present, the water vapor system of the direct air-cooled unit uses a single alkalizing agent (ammonia) to control the pH value of the water quality to prevent corrosion of the water vapo...

AI Technical Summary

Problems solved by technology

The distribution of ammonia water in the vapor-liquid two-phase varies greatly with the change of temperature. The distribution ratio of ammonia water vapor to liquid is about 22.4 to 14.1 at 50 °C to 100 °C, and the distribution ratio of the vapor phase in the vapor-liquid two-phase flow is relatively high. As a result, the pH value of the initial condensation water in the air-cooled island is low, resulting in serious liquid phase corrosion

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