System and method for adjusting boiler feed water oxygen adding amount

A technology for boiler feed water and oxygen addition, which is applied in the control/regulation system, flow control, non-electric variable control, etc., and can solve the problems of tight interference of sampling system, frequent fluctuation of water supply operating parameters, and unsuitable oxygen addition.

Pending Publication Date: 2020-08-18
润电能源科学技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 t

Method used

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  • System and method for adjusting boiler feed water oxygen adding amount
  • System and method for adjusting boiler feed water oxygen adding amount
  • System and method for adjusting boiler feed water oxygen adding amount

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 It is a block diagram of a system for adjusting the amount of oxygen added to boiler feed water provided by Embodiment 1 of the present invention. The system for adjusting the amount of oxygen added to boiler feed water provided by this implementation can be applied to the situation of precisely controlling the amount of oxygen added to boiler feed water. places, including:

[0029] A programmable logic controller 1, the programmable logic controller 1 is arranged on the boiler oxygenation pipeline 3, the programmable logic controller 1 is used to receive the control signal and generate a programmable logic controller according to the control signal 1 instruction.

[0030] In this embodiment, the programmable logic controller 1 is a digital operation electronic system specially designed for application in industrial environments. It uses a programmable memory to store instructions for performing logic operations, sequence control, timing, counting, and arithm...

Embodiment 2

[0035] figure 2 A block diagram of a system for adjusting the amount of oxygen added to boiler feed water provided by Embodiment 2 of the present invention. This embodiment adds other functional modules on the basis of Embodiment 1 and makes a detailed description. The embodiment provides a A system for adjusting the amount of oxygen added to boiler feed water can be applied to the situation of precisely controlling the amount of oxygen added to boiler feed water, specifically, including:

[0036]A programmable logic controller 1, the programmable logic controller 1 is arranged on the boiler oxygenation pipeline 3, the programmable logic controller 1 is used to receive the control signal and generate a programmable logic controller according to the control signal 1 instruction.

[0037] A flow controller 2, the flow controller 2 is connected with the programmable logic controller 1, and is used to adjust the flow rate of oxygenation according to the instructions of the progr...

Embodiment 3

[0053] Figure 4 It is a schematic flow chart of a method for adjusting the amount of oxygen added to boiler feed water provided by Embodiment 3 of the present invention. The method for adjusting the amount of oxygen added to boiler feed water provided in this implementation can be applied to the situation of precisely controlling the amount of oxygen added to boiler feed water. places, including:

[0054] Step 310, acquiring various real-time data in the boiler and generating control signals according to the real-time data.

[0055] In this embodiment, a plurality of internal real-time data of the boiler are obtained, and the various real-time data include: feed water flow rate, feed water dissolved oxygen and feed water hydrogen conductivity.

[0056] Step 320, receiving a control signal and generating a PLC instruction according to the control signal.

[0057] In this embodiment, the following control parameters are set and adjusted: Feed water dissolved oxygen set value ...

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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...

Claims

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Application Information

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IPC IPC(8): G05B19/05G05D7/06
CPCG05B19/05G05D7/0617
Inventor 李海荣常亮张小霓王锋涛薛昌刚
Owner 润电能源科学技术有限公司
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