Segmental oxidation treatment system and treatment method of thermodynamic system of novel coal-fired power plant

Abstract

The invention discloses a segmental oxidation treatment system and a segmental oxidation treatment method of a thermodynamic system of a novel coal-fired power plant. The system comprises an oxygen-enriched water preparing system and an automatic reagent-adding control system. The treatment method comprises the following steps: preparing oxygen-enriched water by using the oxygen-enriched water preparing system; and carrying out segmental oxidation treatment on the thermodynamic system in an oriented reagent-adding manner by taking the oxygen-enriched water as an oxidizing agent, thereby promoting a water supply system and a high-pressure heater drainage system to be in an aerobic working condition and a steam system to be in an anaerobic working condition. According to the system and the method which are disclosed by the invention, the problem of flow accelerated corrosion of the water supply system and the high-pressure heater drainage system which are arranged at the front of a furnace is solved; and meanwhile, the surplus oxygen is prevented from entering the steam system to possibly perform adverse effects on a superheater and a reheater.

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 thermal system staged oxidation treatment system and treatment method. Background technique [0002] Oxygenation of boiler feed water is recognized as an advanced treatment process to inhibit flow-accelerated corrosion of the thermal system and reduce the fouling rate in the middle and low temperature sections of the boiler heating surface. The traditional oxygenation treatment process is to add oxygen to the condensate polishing outlet and the downcomer of the deaerator to control the higher dissolved oxygen in the feed water, so that the thermal system is oxidized step by step according to the water vapor flow, so that the entire thermal system is in an aerobic working condition. In recent years, with the frequent occurrence of scale problems in the high temperature section (superheater, reheater) of the super ...

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Problems solved by technology

In recent years, with the frequent occurrence of scale problems in the high temperature section (superheater, reheater) of the super (super) critical boiler heating surface, the impact of the traditional oxygen addition treatment on the high temperature oxidation of steam has aroused people's doubts and concerns. It also limits the popularization and application of oxygenation technology

In order to avoid the possible adverse effects of the oxygen in the steam on the high-temperature oxidation of the steam system, many units have changed to the low-oxygen treatment method of the feed water. This method can reduce the dissolved oxygen content in the steam, but it cannot solve the flow-accelerated corrosion problem of the high-addition hydrophobic system , and cannot reduce the pH of water vapor to prolong the operation period of the condensate polishing mixed bed

On the other hand, due to the use of oxygen as the oxidant, it is difficult to accurately control the injection of trace gases, and the actual operation is more difficult, and it is difficult to meet the control requirements of low content of oxygen in the feed water

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