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Hydrocarbon cracking

a hydrocarbonaceous material and pyrolysis furnace technology, applied in chemical/physical/physical-chemical processes, chemical apparatus and processes, chemical/physical/physical processes, etc., can solve the problem of unavoidable formation of coke in the furna

Inactive Publication Date: 2008-06-12
EQUSR CHEM LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]In accordance with this invention, the foregoing transfer line exchanger problems are minimized by coating the exposed metal upstream side of the upstream tube sheet face with at least one refractory.

Problems solved by technology

In the cracking process coke is unavoidably formed in the furnace, and just as unavoidably, coke fines find their way into the furnace product that passes into the transfer line exchanger.
Thus, the exposed metal upstream side of the upstream tube sheet face of the exchanger and the interior of the exchanger tubes are both constantly impacted with hot furnace product containing coke particulates (fines).

Method used

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example

[0044]A tube-type heat exchanger as shown in FIG. 3 containing 56 carbon steel tubes 12 each having an inside diameter of 1.75 inches and a length of 26 feet is employed downstream of a conventional cracking furnace. The feed to the furnace is ethane to be cracked to ethylene. The mass flow rate of cracked ethane furnace product in transfer line 4 is about 35,000 pounds / hour / square foot of cross section of line 4. The temperature at upstream side 28 of tube sheet face 11 is about 1,550 F. at a pressure of about 12 psig. The mass flow rate of cracked furnace product in interior 26 of tubes 12 is about 6 pounds / second / square foot of tube cross section. Upstream side 28 of tube sheet face 11 is coated with a refractory containing about 80 wt. % alumina, the remainder being a mixture of magnesium oxide, phosphoric acid, and silica, based on the total weight of the refractory. The exposed metal interior surfaces of the carbon steel tubes 12 are left uncoated with refractory.

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Abstract

A method and apparatus for extending the operating life of a tube-type heat exchanger that has an upstream tube sheet face that carries a plurality of hollow tubes wherein the upstream side of the tube sheet face is coated with at least one refractory.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to the thermal cracking of a hydrocarbonaceous material in a pyrolysis furnace. More particularly, this invention relates to the transfer line exchanger (TLE) of a pyrolysis furnace.[0003]2. Description of the Prior Art[0004]Thermal cracking of hydrocarbons is a petrochemical process that is widely used to produce olefins such as ethylene, propylene, butenes, butadiene, and aromatics such as benzene, toluene, and xylenes. In an olefin production plant, a hydrocarbonaceous feedstock such as ethane, naphtha, gas oil, or other fractions of whole crude oil is mixed with steam which serves as a diluent to keep the hydrocarbon molecules separated.[0005]This mixture, after preheating, is subjected to hydrocarbon thermal cracking using elevated temperatures (1,450 to 1,550 degrees Fahrenheit or F.) in a pyrolysis furnace (steam cracker or cracker). This thermal cracking is carried out without the aid of a...

Claims

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Application Information

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IPC IPC(8): C10G9/00
CPCC10G9/002
Inventor BANDALI, ALNOOR
Owner EQUSR CHEM LP