System and method for sectional pH (potential of hydrogen) value adjusting of thermal system of thermal power plant

Abstract

The invention relates to a system and a method for sectional pH (potential of hydrogen) value adjusting of a thermal system of a thermal power plant, which are used for controlling the sectional pH value adjusting of the thermal system and enabling a water supply system and a water drain system of a low pressure heater to avoid corrosion accelerating caused by flowing. The system comprises an ammonia solution preparation system and a dosage automatic control system. The adjusting method comprises the following steps of enabling the ammonia solution preparation system to prepare a low-concentration ammonia water solution, using the low-concentration ammonia water solution as a pH value adjuster, enabling a directional dosage pipeline to adjust the pH value of the thermal system by sections, and enabling the water supply system and the water drain system of the low pressure heater to avoid corrosion accelerating caused by flowing. The system and the method have the advantages that the problem of easiness in corrosion accelerating caused by flowing in the water supply system and the water drain system of the low pressure heater in front of the furnace are solved; the content of iron in the drained water is greatly reduced, and the influence to the thermal system is avoided.

Description

technical field [0001] The invention relates to the field of water chemical working conditions in thermal power plants, in particular to a novel thermal power plant thermodynamic system segmented pH adjustment system and a treatment method. Background technique [0002] Increasing the pH value of water is recognized as an advanced water treatment process to inhibit flow-accelerated corrosion in thermal systems and reduce the fouling rate in the middle and low temperature sections of the boiler heating surface. The pH adjustment system of the thermal system of the traditional thermal power plant is to add ammonia solution to the outlet main pipe of the condensate polishing treatment mixed bed, the downcomer of the deaerator, and the starting dosing point of the closed cold water to control its pH value to maintain a weak alkaline, so that the water vapor in the thermal system The process is alkalized step by step to inhibit the dissolution of iron ions in the thermal system. ...

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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a thermal power plant thermodynamic system segmented pH adjustment system and method, which not only solves the problem that the water supply system in front of the furnace and the low-pressure drainage system are prone to flow-accelerated corrosion, and the heating surface of the boiler The problem of high scale rate can be solved, and the adverse effect of iron content in the hydrophobic water on the thermal system can be greatly reduced

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