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Method for alleviating corrosion of boiler preheater

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

Active Publication Date: 2013-06-12
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • 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

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  • Method for alleviating corrosion of boiler preheater

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Embodiment approach

[0022] According to the method of the present invention, the fuel of the boiler can be various conventionally used fuels, such as at least one of crushed coal, pulverized coal, coal water slurry, and coal gas. The method of the present invention is particularly suitable for metallurgical gas It is a fuel boiler system. Therefore, 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 the combustible gas containing carbon monoxide produced in the metallurgical process, especially the 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 achieved by figure 1 The system shown is implemented. Among them, the water passing...

Embodiment 1

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

[0032] The waste steam used for the power generation of the steam turbine 18 passes through the valve 9 and then enters the heat exchanger 11. The blower 13 reduces the combustion air (about 15°C) to 110000Nm 3 The flow rate of / h is sent to the heat exchanger 11, which is used for heat exchange between the waste steam generated by the steam turbine 18 and the combustion-supporting air, and then is exported through the pipe 12; the heat-exchanged combustion-supporting air (90-100°C) enters the installation through the pipe 10 In the boiler preheater 5 in the flue 4. The heat-exchanged combustion-supporting air in the boiler preheater 5 and the flue gas in the flue 4 form a countercurrent heat conduction contact, t...

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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 reducing corrosion of a boiler preheater. Background technique [0002] Boiler refers to the equipment that uses the chemical energy of various fuels to heat the contained liquid to certain parameters and output heat energy to the outside. Widely used boiler fuels include pulverized coal, coal gas (such as metallurgical gas) and crude oil. Metallurgical gas refers to the combustible gas containing carbon monoxide produced in the metallurgical process, especially the 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 , Can be used for combustion to produce steam to drive steam turbines for power generation. The combustion of boiler fuel inevitably produces a large amount of flue gas. The flue gas still has a relatively high temperature. A boiler preh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 童伟肖志军
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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