Power station boiler and water-supply oxygen supplementing device and method thereof

Abstract

The invention discloses a power station boiler and water-supply oxygen supplementing device and method thereof. The water-supply oxygen supplementing device comprises an oxygen content measuring module, an oxygen source and an oxygen flow regulating module, wherein the oxygen content measuring module is used for measuring the dissolved oxygen content of condensation water positioned on an outlet of a condensation water pump set of the power station boiler; the oxygen source is used for supplying oxygen needed by oxygen supplementation; and the oxygen flow regulating module is connected with the oxygen source, can be connected with an inlet of the condensation water pump set, and is used for controlling the oxygen supplementing flow of the condensation water according to the dissolved oxygen content output by the oxygen content measuring module. The condensation water constant-pressure oxygen supplementing device and method of the power station boiler are used for a water-supply weak oxidation treatment mode of a high-parameter set of a power plant and supplementing, regulating and controlling the dissolved oxygen of the condensation water and economizer supplying water and accords with the requirements for weak oxidation treatment (WOT). The invention simplifies a system and enhances the safety and the reliability of the system through oxygen supplementing point and flow regulation design, stabilizes the oxygen supplementing pressure difference, and simplifies the control.

Description

[0001] Application for cross-reference [0002] This application claims the priority of the utility model application with the application number 200820180272.4 and the name "a power station boiler and its water supply oxygen supply device" submitted to the China Patent Office on December 1, 2008, and the entire content of which is incorporated herein Reference. technical field [0003] The invention relates to a power plant boiler feed water treatment technology, in particular to a power plant boiler and its feed water oxygenation device and method. Background technique [0004] Dissolved oxygen is considered to be an important chemical indicator in the monitoring of water vapor cycle in power plants. Chemical methods for boiler feed water treatment include Reducing All-Volatile Treatment (AVT(R)), Oxidizing All-Volatile Treatment (AVT(O)) and Oxygenated Treatment (OT) . The system using OT and AVT(O) is currently the most reliable and well-operated feedwater treatment s...

AI Technical Summary

Problems solved by technology

However, the OT method in the prior art is not applicable or cannot be used in the AVT (O) method in many aspects. For example, 1) the pressure of the oxygen addition point is relatively high, the system design and installation requirements are correspondingly increased, and the safety factor is reduced; 2) the oxygen addition point is relatively high, and the safety factor is reduced; After the point pressure is increased, the volume flow rate decreases by an order of magnitude for the trace amount of oxygen required by the AVT(O) method, which brings obvious difficulties to the selection, calibration and flow adjustment control of the oxygenation system components; 3) for accurate detection and control For two-point oxygenation, it is necessary to add an oxygen meter and its sampling points between the first and second oxygenation points; 4) The operating pressure of the oxygenation point changes significantly with the load, and the trend of the pressure difference between it and the oxygenation system is the same as that of the oxygenation system. The change in the required direction is just the opposite, which is unfavorable for adjustment; 5) To adjust the oxygen addition in time and accurately with the load, it is necessary to design a more complex linkage measurement and control system

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