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Quenching boiler provided with enhanced heat transfer member

A quenching boiler and enhanced heat transfer technology, applied in heat transfer modification, non-catalytic thermal cracking, cracking, etc., can solve the problems of difficult processing and manufacturing, high cost and other problems, and achieve the extension of online time, improve life, and extend online time Effect

Active Publication Date: 2010-11-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of enhanced heat transfer technologies for tubular heat exchangers and they are widely used, these existing technologies also face some confusion, mainly due to the difficulty in manufacturing and high cost.
[0010] Since the fluid in the quench boiler has the characteristics of high-quality flow rate, high temperature, high pressure, and easy coking, how to apply the existing enhanced heat transfer technology to the quench boiler, so as to effectively improve the heat exchange efficiency, reduce coking, and prolong the online operation cycle, has been No report

Method used

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  • Quenching boiler provided with enhanced heat transfer member
  • Quenching boiler provided with enhanced heat transfer member
  • Quenching boiler provided with enhanced heat transfer member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment is to use the same bathtub type quenching boiler as Comparative Example 1, and a cracking furnace with an ethylene production capacity of 100,000 tons / year is equipped with the quenching boiler of the present invention. Its dimensions and parameters are shown in Table 1, and the process parameters are shown in Table 1. Table 2. The raw material of cracking furnace is HVGO.

[0048] Table 2 Process Parameters of Quenching Boiler

[0049]

[0050] according to Figure 4 The temperature change curve of the bathtub-type quenching boiler shown in , and the tube-side pyrolysis gas flow, pressure and temperature are calculated to obtain the temperature value when the shell-side high-pressure water vaporizes at 5%, and the tube-side cracking gas flow corresponding to this temperature is calculated in the tube of the quenching boiler. According to the cracking gas flow rate, pressure and temperature, the linear velocity of the cracking gas flow can be obtaine...

Embodiment 2

[0059] The present embodiment is a cracking furnace with an ethylene production capacity of 100,000 tons / year, equipped with a bathtub-type quenching boiler of the present invention, its dimensions and parameters are shown in Table 3, and its process parameters are shown in Table 4. The raw material of cracking furnace is NAP.

[0060] according to Figure 4 The temperature change curve shown in , and the tube-side gas flow, pressure and temperature can be calculated to obtain the temperature value when the shell-side high-pressure water is vaporized at 5%, and the residence time of the tube-side cracking gas flow in the tube-side of the quenching boiler is calculated at this temperature, Therefore, it can be calculated according to the linear velocity of the airflow that the vaporization rate of the shell-side high-pressure water is 5% at a distance of about 90D from the tube-side inlet. Considering the reasons of coke cleaning and easy operation, the twisted sheet tube is set...

Embodiment 3

[0066] This embodiment is a cracking furnace with an ethylene production capacity of 100,000 tons / year, and the bath-type quenching boiler it is equipped with is the quenching boiler of the present invention, its dimensions and parameters are shown in Table 5, and its process parameters are shown in Table 6. The raw material of cracking furnace is NAP.

[0067] according to Figure 4 The temperature change curve of the bathtub-type quenching boiler shown in can obtain the residence time of the tube-side airflow in the tube-side of the quenching boiler at 520°C, so that the position can be calculated according to the linear velocity of the tube-side airflow. It can be seen that the fluid temperature in the tube is about 520°C at a distance of about 115D from the entrance of the tube, and the twisted sheet tube is set at a distance of 1600mm from the entrance of the tube in consideration of coke cleaning and convenient operation.

[0068] Compared with Comparative Example 2, the...

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Abstract

The invention discloses a quenching boiler provided with an enhanced heat transfer member. The quenching boiler comprises a heat exchange pipe and a shell layer. The enhanced heat transfer member is arranged in the heat exchange pipe of the quenching boiler and is arranged at a position where a vapor phase in shell-side fluid of the quenching boiler accounts for less than 5 volume percent of the fluid or at a position where the temperature of the shell-side fluid of the quenching boiler is higher than 520 DEG C. The quenching boiler is applied to an ethylene cracking device, can enhance the heat transfer effect of the quenching boiler, and delays the coking of the quenching boiler so as to prolong the online time of the quenching boiler.

Description

technical field [0001] The invention relates to quenching heat exchange equipment matched with petrochemical ethylene cracking furnaces. Background technique [0002] The hydrocarbon cracking raw materials undergo high-temperature cracking reaction in the furnace tube of the radiant section of the tube cracking furnace, and the temperature of the high-temperature cracking gas generated can be as high as 800-900 °C. In order to prevent the occurrence of secondary reactions and reduce the loss of hydrocarbons, the high-temperature cracked gas needs to enter the quenching zone for rapid cooling, and at the same time recover heat energy to generate high-pressure steam. As we all know, the quenching boiler is an important heat exchange equipment used in the quenching area of ​​the ethylene cracking unit. It usually includes a heat exchange tube and a shell. ~900°C high-temperature pyrolysis gas mixture; flowing cooling medium in the shell side, that is, a saturated water mixture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D7/00F28F13/00C10G9/18C07C11/04C07C4/04
Inventor 王国清张利军周先锋张兆斌杜志国周丛刘俊杰
Owner CHINA PETROLEUM & CHEM CORP
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