Multi row radiant coil arrangement of a cracking heater for olefin production
A system for cracking hydrocarbons including a fired heater having a radiant section and a convective section. The radiant coil is disposed within the radiant section of the heater, the radiant coil having three to seven rows of tubes, wherein each row comprises two multi-pass tubes, and wherein the multi-pass tubes of the three to seven rows of tubes are collectively disposed symmetrically or pseudo symmetrically within the radiant section of the heater. The system further including a transfer line exchanger fluidly connected to an outlet tube of each of the three to seven rows of tubes.
1 . A system for cracking hydrocarbons, comprising:
a fired heater having a radiant section and a convective section;
one or more radiant coils disposed within the radiant section of the heater, each of the one or more radiant coils comprising three to seven rows of multi-pass tubes, and wherein each of the three to seven rows of multi-pass tubes is collectively disposed symmetrically or pseudo symmetrically within the radiant section of the heater;
a single transfer line exchanger fluidly connected to an outlet tube of each of the three to seven rows of multi-pass tubes for each respective radiant coil of the one or more radiant coils.
2 . The system of claim 1 , wherein, for each respective radiant coil of the one or more radiant coils, the three to seven rows of multi-pass tubes each comprise inlet tubes fluidly connected to a respective one or more outlet tubes, each row of tubes having from 3 to 16 inlet tubes, and wherein at least three of the inlet tubes are fluidly connected to each respective outlet tube.
3 . A system for cracking hydrocarbons, comprising:
a fired heater having a radiant section and a convective section;
a radiant coil, disposed within the radiant section of the heater, comprising three to seven rows of multi-pass tubes, wherein each row comprises two multi-pass tubes, and wherein the multi-pass tubes of the three to seven rows of multi-pass tubes are collectively disposed symmetrically or pseudo symmetrically within the radiant section of the heater;
a single transfer line exchanger fluidly connected to an outlet tube of each of the three to seven rows of multi-pass tubes.
4 . The system of claim 3 , wherein the three to seven rows of multi-pass tubes each comprise inlet tubes fluidly connected to a respective one or more outlet tubes, each row of tubes having from 3 to 16 inlet tubes, and wherein at least three of the inlet tubes are fluidly connected to each respective outlet tube.
5 . The system of claim 3 , wherein the three to seven rows of multi-pass tubes are two-pass tubes, four-pass tubes, six-pass tubes, or 8-pass tubes.
6 . The system of claim 3 , wherein a tube spacing between each adjacent row of inlet tubes is a length W, and wherein a tube spacing of each adjacent outlet tube is no greater than 2W.
7 . The system of claim 3 , wherein a tube spacing between each adjacent row of inlet tubes is a length W, and wherein a tube spacing of each adjacent outlet tube is no greater than 1.5W.
8 . The system of claim 3 , wherein a tube spacing between each adjacent row of inlet tubes is a length W, and wherein a tube spacing of each adjacent outlet tube is no greater than 1.1W.
9 . The system of claim 3 , further comprising a heating coil disposed in the convective section of the heater, the heating coil being fluidly connected to a feed distributor configured for distributing a flow of hydrocarbons to each of the inlet tubes of the radiant coil.
10 . The system of claim 3 , wherein a manifold fluidly connects a first set of inlet tubes to an outlet tube, and wherein an outlet tube is provided for every 3 to 14 inlet tubes.
11 . The system of claim 10 , wherein the inlet tubes and the outlet tubes of each row are respectively arranged linearly.
12 . The system of claim 10 , wherein the inlet tubes of the three to seven rows of multi-pass tubes are arranged non-linear with respect to the outlet tubes.
13 . The system of claim 12 , wherein the outlet tubes are arranged linearly with respect to a middle of the three to seven rows of multi-pass tubes.
14 . The system of claim 1 ,
wherein, for each respective radiant coil of the one or more radiant coils, the three to seven rows of multi-pass tubes each comprise inlet tubes fluidly connected to a respective one or more outlet tubes, each row of tubes having from 3 to 16 inlet tubes;
wherein, for each respective radiant coil of the one or more radiant coils, a first row of the three to seven rows of multi-pass tubes is disposed linearly along a line, and wherein a second row of the three to seven rows of multi-pass tubes is disposed linearly on a first side of the line, and a third row of the three to seven rows of multi-pass tubes is disposed linearly on another side of the line.
15 . The system of claim 1 , wherein the radiant coil comprising three to seven rows of multi-pass tubes comprises three to seven rows of inlet tubes.