Ethylene cracking furnace combustion system taking water-coal-slurry as fuel

Abstract

The invention relates to a water-coal-slurry alternative technology, aiming to provide an ethylene cracking furnace combustion system taking water-coal-slurry as fuel. The system has the technical scheme that slap tapping vertical cyclone furnaces are used as extended furnaces of an ethylene cracking furnace; each slap tapping vertical cyclone furnace is provided with a columnar furnace body, the top of the furnace body is provided with a combustor, and the combustor is provided with a methane hydrogen burner nozzle and a water-coal-slurry atomizing nozzle; primary air outlets are arranged at the combustors, tangential secondary air nozzles are arranged at the upper parts of the furnace chambers, and tangential combustion secondary air nozzles are arranged at the lower parts of the furnace chambers; horizontal transition gas ducts are arranged between the bottoms of the furnace chambers and the bottom of an ethylene cracking furnace radiation section, and vertical slag capture pipe bundles are arranged at the inlets of the horizontal transition gas ducts in a staggered way; the bottom of each slap tapping vertical cyclone furnace is provided with a slag fence, and a slag well is arranged under the slag fence. According to the ethylene cracking furnace combustion system taking the water-coal-slurry as the fuel, disclosed by the invention, the water-coal-slurry is used for replacing methane hydrogen, so that the utilization efficiency and the value of the methane hydrogen are greatly enhanced; the slag capture efficiency of the vertical cyclone furnaces is improved to over 90%, and liquid ashes can be comprehensively utilized, therefore the application value and the economic benefit are wide.

Description

technical field [0001] The invention relates to an alternative process for coal-water slurry to replace methane hydrogen as fuel, in particular to a combustion system for an ethylene cracking furnace using coal-water slurry as fuel. Background technique [0002] my country is rich in coal resources, but lacks oil and natural gas resources, and the energy structure dominated by coal will exist for a long time. Therefore, it is of great strategic significance to develop a technology that uses coal as fuel to replace oil and natural gas; from the perspective of resource utilization, It is more direct and efficient to turn coal into oil products through complex processes and then use oil products as fuels than to use new technologies and new processes to directly use coal as industrial fuels. [0003] Coal water slurry is a coal-based liquid fuel, which generally refers to a mixture composed of 65%~70% coal powder, 30%~35% water and a small amount of chemical additives. It repla...

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Problems solved by technology

[0002] my country is rich in coal resources, but lacks oil and natural gas resources, and the energy structure dominated by coal will exist for a long time. Therefore, it is of great strategic significance to develop a technology that uses coal as fuel to replace oil and natural gas; from the perspective of resource utilization, It is more direct and efficient to turn coal into oil products through complex processes and then use oil products as fuels than to use new technologies and new processes to directly use coal as industrial fuels

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