Ethylene cracking furnace

Abstract

The invention discloses an ethylene cracking furnace. The ethylene cracking furnace comprises a radiation section, a convection section, a quenching boiler, a high-pressure steam pocket, a draught fanand the like, wherein a radiation furnace pipe comprises a plurality of radiation furnace pipe groups; an outlet pipe and an inlet pipe of each radiation furnace pipe group are intensively arranged respectively; the radiation section of the ethylene cracking furnace adopts double-section type heat supply; combustors at the upper part are distributed at two sides of each inlet pipe or the load ofthe combustors arranged at two sides of each outlet pipe is low. According to the ethylene cracking furnace disclosed by the invention, the hidden danger of secondary reaction and coking can be greatly reduced, and the problem that an outer wall of the radiation furnace pipe is overheated is further alleviated; the interval time of cleaning coke can be remarkably prolonged, and the service life ofthe radiation furnace pipe is prolonged.

Description

technical field [0001] The invention relates to the field of ethylene cracking, in particular to an ethylene cracking furnace. Background technique [0002] The ethylene cracking furnace, which adopts the steam cracking method of petroleum hydrocarbons to produce ethylene, usually includes a radiation section, a convection section, a quenching boiler, a high-pressure steam drum, and an induced draft fan. In the ethylene cracking furnace, a strong endothermic cracking reaction is carried out in the radiant furnace tube of the radiant section, and the heat required for the reaction is supplied by the fuel consumed by the heating equipment (ie, the burner) in the furnace. According to the different installation positions in the furnace of the cracking furnace, the burner can be divided into two types: bottom burner and side wall burner, so the heating mode of the cracking furnace can be divided into three types: full bottom burner heating, full side burner Wall burner heating ...

AI Technical Summary

Problems solved by technology

The combination of heating at the bottom and side walls takes into account the advantages and disadvantages of the first two heating methods, but when it is applied to a large-scale cracking furnace, it still has the possibility of overheating of the outer wall of the furnace near the side wall burner and the overheating of the bottom burner and flames. Flip and other issues

Its NO x The emission is between all bottom heating and all side wall heating, and it is difficult to meet the emission standards under the circumstances that environmental protection requirements are getting higher and higher

[0006] In addition to the above-mentioned problems, the traditional heating method also faces other new challenges with the development trend of large-scale cracking furnaces and the increase in the requirements for operation automation: the load of a single burner is too large, and the probability of the flame turning over and licking the furnace tube is greatly increased. Partial overheating of the furnace tube and shortening of the operating cycle occurred, which seriously affected the long-term stable and safe operation of the device; in addition, the increase in the height of the furnace continued to increase the number of side wall burners, which increased the risk of overheating of the outer wall of the furnace and aggravated the on-site The intensity of daily inspection and maintenance work by operators is also not conducive to meeting the increasingly stringent requirements for energy saving, emission reduction and operation automation

[0007] In the Chinese patent application CN 104560114A, an ethylene cracking furnace with a double-stage heating structure is disclosed, which can alleviate the problems of complex design of the combustion system and excessive load of a single burner to a certain extent. The ethylene cracking furnace has the hidden danger of secondary reaction and coking. In addition, it also has problems such as the high temperature of the outer wall of the radiant furnace tube, which shortens the service life of the radiant furnace tube.

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