Study On The Technology Of Ethylene Cracking Furnace

As production of ethylene cracking furnace important tool, in the construction of the country’s production and play an important role, so the efficiency of cracking furnace is higher, larger production capacity, technology to keep up with the advanced technology both at home and abroad, so the ethylene plant of ethylene cracking furnace.The ethylene plant in revamping/expansion of cracking furnace, energy saving transformation, raw material optimization, cracking deep and running control system, greatly reduce the comprehensive energy consumption of the device, ethylene and three olefine yields increased.Transform the KTI technology, and the original LSCC1-1 type furnace replacement for GK- 6 type furnace tube, and to modify the bottom of the burner. After modification, single ethylene cracking furnace with production capacity of 60000 tons/year up to 84000 tons/year, at the same time also to the convection section of cracking furnace and quenching boiler, add a layer of convection section, change the high heat transfer capacity of quench boiler, the exhaust temperature cracking furnace since putting into operation up to 140 ℃, 130 ℃, the average ratio reduced about 30 ℃ before modification, and the thermal efficiency up to 93.36% from 90.5% before modification, high pressure steam production rate from 1 ton/tons of raw materials before modification to 1.43 ton/tons of raw materials, transform the desired purpose. Convection section of cracking furnace waste heat recovery rate is greatly increased, at the same time, its high pressure steam rising, introduction of high pressure steam content is reduced, effectively reducing the comprehensive energy consumption, marked the ethylene cracking furnace will further develop its energy saving effect, reduce the energy consumption of unit.In this paper, the cracking furnace effect is analyzed and it is concluded that the optimal operation data. According to the test results show that:1.Cracking furnace, according to TECHNIP transformation and new construction experience, cracking furnace transformation, fully meet the requirements of factory: increased production, materials with good elasticity of operation, long operation cycle and satisfy all operating conditions of the factory. With high selectivity of ethylene and propylene; For all the materials, ethylene cracking furnace each output exceeded 84000 tons/year; Simple and practical GK6 furnace tube structure has a short residence time; The less changes to the cracking furnace, achieve the least amount of investment;2.in order to meet the design requirements, adopt advanced SPYRO simulation and field data for evaluation. Modification of the cracking furnace can be used in FCC naphtha, a line, HCTO and circulating gas raw materials. Optimization design of GK6 straight furnace tube can meet the above characteristics.3.to the convection section of cracking furnace and the ethylene quench boiler system renovation, reduce the cracking furnace smoke exhaust temperature and outlet temperature of the cold cracking in the boiler, improve thermal efficiency of cracking furnace, achieved the purpose of saving energy and reducing consumption.4.advanced cracking depth control system after reforming putting-in-service proactively, increased 0.004 c b, dienes yield increased by 0.120%. System since putting-in-service proactively, cracking furnace operation condition was optimized, the stability of the crack depth and overcome to some extent because the oil properties and fuel gas composition fluctuations caused by cracking depth, improve the stability and efficiency of the ethylene plant operation. Cracking furnace outlet online estimation error is less than 3%, cracking depth cracking depth control within +/- 0.02, putting-in-service proactively rate above 95%.