Ammonia-oxygen mixing system and working method thereof

Abstract

The invention discloses an ammonia-oxygen mixing system and a working method thereof, an outlet of an ammonia source system is communicated with an inlet of an ammonia dissolver through a primary pressure reducer, an automatic pressure regulator and a second pressure transmitter, and an industrial pure oxygen or compressed air pipeline and a demineralized water pipeline are communicated with an inlet of an oxygen-enriched water generator through an automatic control system; an outlet of the oxygen-enriched water generator is communicated with an inlet of an ammonia dissolver through a delivery pump, and an outlet of the ammonia dissolver is communicated with a dosing point of a water supply, condensation water or high-pressure heater drainage system in a thermal power plant through a first pressure transmitter and an automatic pressure stabilizer; the automatic control system is connected with the conveying pump, the automatic pressure regulator, the first pressure transmitter, the second pressure transmitter and the automatic pressure stabilizer, the system and the working method thereof can meet the requirements of all-working-condition and full-automatic operation of the thermal power generating unit, and have the advantages of being low in cost, high in maintenance convenience and high in space utilization rate.

Description

technical field [0001] The invention belongs to the technical field of feedwater treatment in thermal power plants, and relates to an ammonia-oxygen mixing system and a working method thereof. Background technique [0002] For large thermal power units, the furnace water treatment system [0003] It is usually designed as follows: at the initial stage of unit start-up, a certain amount of ammonia is added to the water vapor system by using the ammonia addition equipment in the furnace, and the pH of the feed water is adjusted to 9.2-9.6 for anti-corrosion treatment in the furnace (AVT(O)); While adding a certain amount of ammonia to the water vapor system by the ammonia addition equipment in the furnace, it is also necessary to add a small amount of oxygen to the water vapor system by using the oxygen addition equipment to adjust the pH of the feed water to 8.5-9.3 and the oxygen content of the feed water to 10-150ug / L , jointly carry out anti-corrosion treatment in the fur...

AI Technical Summary

Problems solved by technology

[0008] At the same time, the traditional oxygenation device designed and produced according to DL 5000-2000 "Technical Regulations for Thermal Power Plant Design" cannot effectively track unit load changes during deep peak regulation, and the control accuracy of water dissolved oxygen is poor

[0009] Therefore, the existing ammonia and oxygen addition devices have been unable to realize automatic control of feed water pH and dissolved oxygen in all working conditions, let alone coordinated control

[0010] 2. The transformation cost of the coordinated control of the existing ammonia and oxygen addition systems is relatively high

On the premise of realizing the automatic control of the ammonia addition and oxygen addition devices respectively, it is necessary to add corresponding upper computer coordination control software and hardware to realize the coordination control of feed water pH and dissolved oxygen under all working conditions, and the overall transformation cost is relatively high

[0012] 3. The operation and maintenance cost of the ammonia addition and oxygen addition devices is high, the maintenance convenience is poor, the floor area is large, and the space utilization rate is low

There are many manufacturers of the two sets of equipment, the quality of the equipment is uneven, the function settings are uneven, and the types of parts are complicated, resulting in high operation and maintenance costs and poor maintenance convenience

Moreover, the number of equipment and pipelines is large, the floor area is large, and the space utilization rate is low.

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