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Coke oven heating system and method adopting oxygen-enriched combustion

An oxygen-enriched combustion and heating method technology, applied in the direction of combustion method, burner, combustion type, etc., can solve the problems of unusable producer gas, low-quality gas, high combustion temperature, heat loss, etc., and save construction and operation costs , strong radiation ability and low construction cost

Pending Publication Date: 2022-06-28
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existence of a large amount of nitrogen in the combustion-supporting gas has caused heat loss and waste during the coke oven heating process
[0003] Due to the limitation of oxygen content in the air, in order to ensure stable combustion in the coke oven combustion chamber, most of the existing coke ovens use high-quality gas such as coke oven gas or blast furnace gas mixed with coke oven gas for heating, and cannot use producer gas, galloping furnace gas, etc. Low-quality gas such as deflated gas
In addition, in the existing coke oven heating method, the flow rate of air and gas into the combustion chamber is basically the same, and the high-temperature area after the mixed combustion of air and gas is concentrated, and the combustion temperature is high, resulting in the formation of a large amount of nitrogen oxides in the high-temperature area

Method used

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  • Coke oven heating system and method adopting oxygen-enriched combustion
  • Coke oven heating system and method adopting oxygen-enriched combustion
  • Coke oven heating system and method adopting oxygen-enriched combustion

Examples

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Effect test

Embodiment 1

[0052] A single-heat coke oven is heated by coke oven gas, and the calorific value of coke oven gas is 17500kJ / Nm 3 , The combustion-supporting gas used in the original heating system is air. Due to the high heat consumption of coking, the presence of coke in the upper part of the coke cake, and the emission of nitrogen oxides exceeding the standard, the existing heating system is modified.

[0053] like figure 2 As shown, oxygen-enriched gas pipeline and exhaust gas return pipeline 17 are added to the reformed coke oven heating system, and a return exhaust gas regulating valve 14 and a return exhaust gas fan 15 are equipped.

[0054] When the modified coke oven heating system works, the oxygen delivered from the oxygen pipe network 7 is mixed with the returned combustion exhaust gas to form an oxygen-rich gas with an oxygen content of 50%, and the oxygen-rich gas enters the heat storage through the oxygen-rich gas pipe 1. Chamber 5, after being preheated by regenerator 5, t...

Embodiment 2

[0059] In a new coking plant, it is planned to use the purge gas from the methanol synthesis in the plant as the heating gas source for the coke oven, and use the coke oven gas with high calorific value for other purposes. The calorific value of the purge gas is 9800kJ / Nm 3 . Due to the high hydrogen content and low methane and carbon monoxide content in the purge gas, its calorific value is lower than that of coke oven gas. At the same time, due to the high hydrogen content in the purge gas, there may be a risk of explosion after preheating in the regenerator. Therefore, the purge gas needs to enter the combustion chamber directly through the rich gas pipeline. When air with an oxygen concentration of 21% meets, it is easy to defire in the combustion chamber and cannot be stably burned. That is, using the existing coke oven heating system may cause the purge gas to fail to achieve stable combustion in the combustion chamber.

[0060] The heating system of the new coke oven ...

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Abstract

The invention relates to a coke oven heating system and method adopting oxygen-enriched combustion. The system comprises a gas-enriched pipeline and / or a lean gas pipeline, an oxygen-enriched gas pipeline and a waste gas return pipeline, a rich gas regulating valve is arranged on the rich gas pipeline, a lean gas regulating valve is arranged on the lean gas pipeline, an oxygen regulating valve, a return distribution waste gas inlet, an oxygen concentration analyzer and an oxygen-enriched fan are arranged on the oxygen-enriched gas pipeline, and the return distribution waste gas inlet is connected with a waste gas pipeline led out of the regenerative chamber through a waste gas return distribution pipeline. And the waste gas return pipeline is provided with a return waste gas regulating valve and a return waste gas fan. The invention can improve the radiation heat transfer efficiency in the furnace, reduce the waste gas amount, reduce the coking energy consumption of the coke oven, shorten the coking time, save high-quality gas resources and reduce the generation of nitrogen oxides in the combustion process.

Description

technical field [0001] The invention relates to the technical field of energy saving and environmental protection, in particular to a coke oven heating system and method using oxygen-enriched combustion. Background technique [0002] In the heating system of the existing coke oven, coke oven gas or blast furnace gas is used as the gas, and air is used for the combustion-supporting gas, and the air and the gas are mixed and burned in the combustion chamber. In order to ensure complete combustion, the air excess coefficient is usually above 1.2 during operation. Since about 78% of the air is non-combustible nitrogen, the nitrogen content in the exhaust gas after combustion is above 75% or even higher. Although the combustion exhaust gas is discharged after being cooled to 300 ℃ by heat exchange in the regenerator, it still takes away a large amount of heat; at the same time, nitrogen, as a non-polar diatomic molecule, has no radiation ability, which reduces the radiation inten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/02F23D14/46F23D14/60F23D14/62F23D14/66F27D7/02F27D17/00F27D19/00
CPCF27D7/02F27D19/00F27D17/00F23D14/02F23D14/62F23D14/60F23D14/66F23D14/46Y02E20/34
Inventor 康婷景殿策王明登
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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