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

Method for alleviating corrosion of boiler preheater

A preheater and boiler technology, applied in the field of corrosion, can solve the problems of reducing boiler combustion efficiency, boiler service life, boiler preheater prone to corrosion, etc.

Active Publication Date: 2015-06-03
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the boiler preheater is extremely prone to corrosion, so that the combustion air in the preheater leaks into the flue gas channel, further reducing the efficiency of boiler combustion and the service life of the boiler

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 for alleviating corrosion of boiler preheater
  • Method for alleviating corrosion of boiler preheater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0022] According to the method of the present invention, wherein, the fuel of the boiler can be conventionally used various fuels, such as at least one of pulverized coal, coal powder, coal-water slurry and coal gas, the method of the present invention is particularly suitable for using metallurgical gas The fuel is a boiler system, so according to a preferred embodiment of the present invention, the fuel of the boiler is a fuel containing metallurgical gas.

[0023] The metallurgical gas refers to combustible gas containing carbon monoxide produced in the metallurgical process, especially iron and steel metallurgical process, such as blast furnace gas, converter gas, coke oven gas and producer gas. The calorific value of metallurgical gas is generally 2-20MJ / m 3 .

[0024] According to a particularly preferred preferred embodiment of the present invention, the method of the present invention is as follows: figure 1 The system implementation shown. Wherein, the water fed in...

Embodiment 1

[0031] use figure 1 In the system shown, the water (about 215°C) passed into the boiler 2 by the pipeline 1 is heated in the boiler 2 to steam (9.8MPa, 535°C) and is exported through the pipeline 3 and used for the steam turbine 18 to generate electricity, and the steam turbine 18 is used to generate electricity. After the steam (0.9MPa, 310 ℃).

[0032] The waste steam used for power generation by the steam turbine 18 enters the heat exchanger 11 after passing through the valve 9, and the blower 13 sends the combustion-supporting air (about 15° C.) at 110,000 Nm 3 The flow rate of / h is sent to the heat exchanger 11, which is used for heat exchange between the waste steam and the combustion air after the steam turbine 18 generates electricity, and then exported through the pipeline 12; In the boiler preheater 5 in the flue 4. The heat-exchanged combustion-supporting air in the boiler preheater 5 forms a countercurrent heat conduction contact with the flue gas in the flue 4,...

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 for alleviating corrosion of a boiler preheater. The boiler preheater is arranged in a smoke passage of a boiler, and combustion-assistant air which is fed into the boiler is preheated by utilizing the heat of the smoke of the boiler. The method is characterized by comprising the following steps of controlling the temperature of the combustion-assistant air which is fed into the boiler preheater according to the temperature at a coldest point on the wall of a heated surface of the boiler preheater so as to enable the temperature at the coldest point on the wall of the heated surface of the boiler preheater to be higher than a dew point of sulfur oxide and / or nitrogen oxide in the smoke, wherein the dew point of the sulfur oxide and / or the nitrogen oxide in the smoke refers to the temperature that the sulfur oxide and / or the nitrogen oxide is changed from a gas phase to liquid drops after encountering the water. Through the technical scheme, the corrosion of the boiler preheater is effectively alleviated, so that the service life of the entire boiler device can be prolonged.

Description

technical field [0001] The invention relates to the field of thermal energy, in particular to a method for alleviating corrosion of a boiler preheater. Background technique [0002] A boiler refers to a device that uses the chemical energy of various fuels to heat the liquid contained in it to a certain parameter and outputs heat energy to the outside. Widely used boiler fuels include pulverized coal, gas (such as metallurgical gas) and crude oil. Metallurgical gas refers to combustible gases containing carbon monoxide produced in metallurgical processes, especially iron and steel metallurgical processes, such as blast furnace gas, converter gas, coke oven gas and producer gas. The calorific value of metallurgical gas is generally 2-20MJ / m 3 , can be used to burn steam to drive steam turbines to generate electricity. The combustion of boiler fuel inevitably produces a large amount of flue gas, which still has a relatively high temperature. A boiler preheater can be instal...

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): F23L15/00
CPCY02E20/34
Inventor 童伟肖志军
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com