System and method for adjusting boiler feed water oxygen adding amount

Abstract

The embodiment of the invention discloses a system and method for adjusting the oxygen adding amount of boiler feed water. Specifically, the system comprises a programmable logic controller which is arranged on a boiler oxygenation pipeline, wherein the programmable logic controller is used for receiving a control signal and generating a programmable logic controller instruction according to the control signal; and a flow controller which is connected with the programmable logic controller and is used for adjusting the oxygenation flow according to an instruction of the programmable logic controller. The embodiment of the invention provides the system for adjusting the oxygen adding amount of boiler feed water. By accurately controlling boiler feed water oxygenation, the problem that in the prior art, feed water dissolved oxygen fluctuates greatly is solved, the risk of pipe explosion caused by growth and falling of oxide skin of a superheater and a reheater is reduced, and the effectsthat the feed water oxygenation amount is accurately regulated and controlled, operation and adjustment are easy and convenient to implement, and control is good are achieved.

Description

technical field [0001] Embodiments of the present invention relate to electric power and power engineering control technology, in particular to a system and method for adjusting the amount of oxygen added to boiler feed water. Background technique [0002] High-parameter, large-capacity coal-fired units generally adopt feedwater oxidation treatment methods with better protection effects, including AVT(O) and OT. Compared with AVT(O), OT oxygenation treatment can effectively control the dissolved oxygen content of feed water, ensure the dense and firm oxide film on the inner wall of the water supply system, and have an excellent protective effect. In the process of adding oxygen to the feed water, if the amount of oxygen added to the boiler feed water cannot be precisely regulated, the dissolved oxygen in the feed water often fluctuates greatly due to factors such as changes in the operating parameters of the unit, hysteresis of the feedback signal, and characteristics of the...

AI Technical Summary

Problems solved by technology

During the peak-shaving operation of the unit, these water supply operation parameters fluctuate frequently and in a large range, making it more difficult to control oxygen addition

(3) The accuracy and reliability of the detection of dissolved oxygen in water supply must be guaranteed

The detection of dissolved oxygen and redox potential in water supply is easily interfered by factors such as the tightness of the sampling system

The oxidation-reduction potential detection does not directly detect the dissolved oxygen content, and the detection value can reflect the change trend of the oxidation-reduction characteristics of the feed water, but it is not suitable for regulating the amount of oxygen added.

(4) The oxygen added to the water has the problem of chemical reaction consumption

Images