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

Start calculation method and system for supercritical boiler

A technology of supercritical boilers and calculation methods, which is applied in calculation, design optimization/simulation, special data processing applications, etc., and can solve problems such as large errors

Active Publication Date: 2017-10-24
XI AN JIAOTONG UNIV +2
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing calculation methods are only suitable for the calculation of the dynamic characteristics of the boiler when there is a small change near the steady-state operating point, and the error is large when used for the calculation of the start-up process

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
  • Start calculation method and system for supercritical boiler
  • Start calculation method and system for supercritical boiler
  • Start calculation method and system for supercritical boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0111] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0112] A start-up calculation method for a supercritical boiler, the steps are as follows:

[0113] 1) Furnace combustion calculation: In order to calculate the flue gas temperature, flow rate, density and specific heat at the furnace outlet under different combustion rates during the start-up process, the furnace is divided into two parts: the radiation heat exchange area and the radiation convection area. The radiation heat transfer zone is the area between the bottom of the furnace and the burner, and the heat transfer method is radiation heat transfer, without considering the convective heat transfer between the flue gas and the furnace wall. The radiation convection area is the part above the radiation heat exchange area to the furnace outlet. The heat transfer between the flame and the water wall in this area is mainly radiation heat exchange, and the convective...

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 start calculation method and system for a supercritical boiler. According to the method, first, furnace combustion calculation is performed, wherein a furnace is divided into two parts, namely a radiation heat exchange area and a radiation convection area, and calculation is performed on the two parts respectively to obtain furnace outlet smoke temperature, furnace heat absorption percentage and smoke specific heat under different combustion rates; and second, boiler heating surface heat exchange calculation is performed, wherein on the basis of analyzing and simplifying flowing heat transfer characteristics of an in-pipe working medium side and an out-pipe smoke side in a heating surface in the boiler starting process, a distributed parameter model considering changes of thermal parameters along with position coordinate changes is adopted, mathematic models of change laws of working medium temperature, pressure, enthalpy values, heating surface metal temperature and smoke temperature in the starting process are established according to a mass conservation equation, a momentum conservation equation, an energy conservation equation, a metal heat reservation equation and a complementary equation, and solving is performed. Through the start calculation method and system, arrangement forms of different boiler starting systems can be calculated and compared, and an optimal boiler starting system can be provided for a user.

Description

technical field [0001] The invention belongs to the field of boiler start-up, and in particular relates to a start-up calculation method and system for a supercritical boiler. Background technique [0002] Boiler start-up system and steam turbine bypass system are installed on the supercritical unit, which can greatly improve the flexibility and economic benefits of the supercritical unit. How to design the best boiler start-up system according to the user's investment situation and power plant operation mode, so as to minimize the heat loss during start-up; The temperature of metal walls such as heaters is within the allowable range. While satisfying the above conditions, the operator also needs to know the matching relationship between the boost curve and the combustion rate curve so that the boiler can boost the pressure according to the predetermined boost curve. The basis for solving the above problems is to research and develop calculation methods that can accurately...

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 Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10
Inventor 刘万宇杨冬叶智张小锋赵广勋李增旺党龙瞿丽莉
Owner XI AN JIAOTONG UNIV
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