Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and system for dosing boiler water

A boiler water and dosing pump technology, applied to controllers with specific characteristics, electric controllers, etc., can solve the problems of data acquisition lag and low accuracy of boiler water dosing adjustment, so as to reduce labor intensity and avoid adverse accidents , the effect of improving the accuracy

Active Publication Date: 2020-01-14
INNER MONGOLIA DAIHAI ELECTRIC POWER GENERATION
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a furnace water dosing method and system to solve the problem of low adjustment accuracy of furnace water dosing due to data acquisition lag in the existing dosing method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and system for dosing boiler water
  • Method and system for dosing boiler water
  • Method and system for dosing boiler water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] figure 1 It is the flow chart of Embodiment 1 of the furnace water dosing method of the present invention. Such as figure 1 As shown, the method includes:

[0062] Step 101: Obtain indicator data. Obtain indicator data in the boiler water sample, the indicator data including phosphate concentration, pH, conductivity and feed water. The index data is transmitted to the central controller in the form of phosphate concentration table, conductivity table, pH table, and water supply meter.

[0063] Step 102: Obtain the rate of change of unit load. Real-time monitoring of unit load change rate, that is, the speed of unit load increase or decrease.

[0064] Step 103: Determine whether the rate of change is within a set threshold range. The purpose of judging whether the rate of change is within the range of the set threshold is to judge whether the state in the boiler water at this time is the state of make-up water. The range of the set threshold can be 5MW / min~7MW / min...

Embodiment 2

[0087] The furnace water of a 600MW subcritical wet-cooled coal-fired unit is treated with phosphate, and the continuous dosing method is adopted. The pH value of the furnace water is 9-10. The amount of phosphate added should ensure: when the load is low, maintain PO 4 3- At 0.5-3mg / L; at moderate load, maintain PO 4 3- At 0.5-1.5mg / L; at high load, maintain PO 4 3- At 0.5-1mg / L. When the condenser leaks, the amount of phosphate added should be increased to maintain PO 4 3- In 2 ~ 10mg / L, and strengthen sewage treatment. At the same time, the pH value of the furnace water is required to be 9.0-10.0, and the conductivity is 5-25 μS / cm. Now adopt the multi-parameter collaborative automatic dosing control method of boiler water of the present invention, introduce four parameters of boiler water phosphate concentration, pH, DD, and feed water flow rate, and regulate the phosphate adding system. The method of combining AC frequency conversion technology and computer contr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method and system for feeding a chemical to boiler water. The method comprises the steps of acquiring index data in a boiler water sample, wherein the index data comprises the phosphate concentration, the pH, the conductivity and the water supply amount; acquiring a change rate of the unit load; judging whether the change rate is within a set threshold range or not; when a judgment result shows that the change rate is within the set threshold range, performing PID control on the boiler water by taking the phosphate concentration as a main control parameter and taking the pH and the conductivity as auxiliary control parameters, and generating a chemical feeding pump first openness signal; when the judgment result shows that the change rate is not within the set threshold range, performing PID control on the boiler water by taking the water supply amount as a control parameter, and generating a chemical feeding pump second openness signal; generating a control signal according to the openness signals; and controlling the rotating speed of a motor of a chemical feeding pump according to the control signal. By adopting the method and system disclosed by the invention, the stability and reliability of the control parameters are ensured more comprehensively, the delay of the control process is reduced, the control precision is improved, and fluctuations and errors, which are brought about by one signal sampling error, of the single parameter are avoided.

Description

technical field [0001] The invention relates to the field of automatic control of boiler water, in particular to a method and system for adding medicine to boiler water. Background technique [0002] In order to ensure the safe and economical operation of thermal power plants, reduce the corrosion rate of boiler tubes, reduce the amount of deposits and scaling on the tubes, and improve the quality of steam, the boiler water must be regulated. For medium and low pressure drum boilers, the coordinated phosphate treatment method is generally used to treat the boiler water, and for the high pressure and large capacity units, the low phosphate treatment method is used to treat the boiler water. The pH value, conductivity and phosphate of boiler water are three important indicators of boiler water quality. For the low phosphate treatment process, the pH value is required to be 9-10, the conductivity is about 15 μS / cm, and the phosphate root is between 0.5-3 mg / L. [0003] In fac...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 赵强庞占州刘俊朱志平金绪良李永立王应高
Owner INNER MONGOLIA DAIHAI ELECTRIC POWER GENERATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com