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Heating furnace low-NOx combustion control method based on gas fuel

A control method and gas fuel technology, which are applied in lighting and heating equipment, furnaces, furnace types, etc., can solve the problems of high cost of burner modification, increase energy costs, etc., to improve heat absorption efficiency, reduce NOx generation, reduce Effects of incomplete combustion losses

Active Publication Date: 2021-07-23
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalytic reduction of NOx content is similar to post-treatment. At the same time, the transformation cost of the burner is relatively high, which will greatly increase the energy cost

Method used

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  • Heating furnace low-NOx combustion control method based on gas fuel
  • Heating furnace low-NOx combustion control method based on gas fuel
  • Heating furnace low-NOx combustion control method based on gas fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A large factory rail beam heating furnace, the design of 120T / h, the product mainly focuses on large steel, heavy rail, shaped steel, the billet is 380mm × 280mm large square billet, heating the furnace length of 35m, and the hot load is more than 70%. The heating structure is a preheating section, one heating section, two heating section, three heating section, all-heat section, due to the shortness of the heating furnace, long-term inner heat state, two heating section temperature set 1350 ° C or more, hot The temperature is set to 1300 ° C or more, and since the temperature of the heating furnace is high, the smoke NOx exceeds the standard, NOx reaches 350 mg / nm 3 Also above, the fuel consumption reaches 1.25 g of / t (hot 1200 ° C or more).

[0026] Improve the control method of the rail beam heating furnace, set a hot section gas heat load 2500 ~ 2800 nm 3 / H, air-fuel ratio 2: 1, air excess coefficient 1.05, furnace pressure 5Pa, 1 flue gas detection point detect...

Embodiment 2

[0033] A hot rolled plant slab heating furnace, the design of 250T / h, the product is mainly hot-rolled steel, silicon steel, etc., the billet is 10000 mm × 1280 mm × 230 mm large slab, the heating furnace length is 45m, and the heat is more than 30%. The heating structure is a preheating section, a heating section, two heating section, three heating sections, average heat section, due to the low heat load rate of the heating furnace, high heating temperature, hot section temperature set 1320 ° C or more, hot section The temperature is set 1280 ° C or more, due to the high temperature of the heating furnace, causing the smoke NOx to exceed the standard, reaching 320 mg / nm 3 Also above, the fuel consumption reaches 1.42 g of / t (cold).

[0034] Improved slab heating furnace control method, set a single heat section load 6000 ~ 6500nm 3 / H, air-fuel ratio 2: 1, excess coefficient 1.05, furnace pressure 7Pa, 1 flue gas detection point detection of CO.

[0035] Three heating sect...

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Abstract

The invention relates to a heating furnace low-NOx combustion control method based on a gas fuel, which comprises the following steps: 1) controlling the hearth atmosphere of a soaking section to be weak oxidizing atmosphere, so that the fuel is completely combusted in the soaking section, and the flue gas does not contain CO; 2) controlling the hearth atmosphere of each heating section in a high-temperature section to be a reducing atmosphere, so that the CO content in the flue gas entering a low-temperature heating section from the high-temperature section is 3-10%; 3) controlling the hearth atmosphere of the heating section to be a reducing atmosphere, so that the CO content in the flue gas of the low-temperature heating section is not more than 1.5%; and (4) an air nozzle is additionally arranged on a preheating section, when the CO content in the flue gas of the preheating section is larger than 1%, an air nozzle is opened to burn residual CO, the air nozzle is closed until the CO content is zero, and it is guaranteed that an air excess coefficient of the preheating section is larger than 1.2. Generation of flue gas NOx in the high-temperature section is reduced, meanwhile, residual fuel is combusted through the low-temperature section, and the heat absorption efficiency of a steel billet is improved.

Description

Technical field [0001] The present invention relates to the field of thermal energy-saving technologies, and more particularly to a method of low NOx combustion control based on gas fuel based on gas fuel. Background technique [0002] NOx is one of the pollutants of focus control, which causes the main pollution sources of acid rain and photochemical smoke, which has great harm to human health, all kinds of crops and ecological environments. With the implementation of the new environmental law, the requirements for steel enterprises are more strict, according to the ultra-low emission standards of steel enterprises, the metric NOx of the rolling process heating furnace and the heat treatment furnace is as low as 150mg / nm. 3 . [0003] NOx in the steel industry mainly comes from the fuel combustion process, mainly including the combustion of coal, coke combustion, combustion of fuel oil and combustion of industrial secondary gas, and N in high temperature conditions + N 2 , In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B9/40F27B9/04
CPCF27B9/40F27B9/045
Inventor 刘常鹏李先春金丙真孙守斌李卫东张天赋闫东阳赵爱华赵俣王东山
Owner ANGANG STEEL CO LTD
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