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Quenching Boiler and Its Application

A technology for quenching boilers and enhancing heat transfer, which is applied in the chemical industry and can solve the problems of mechanical decoking of heat exchange tubes, affecting the working effect and service life of quenching boilers, etc.

Active Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that although the heat transfer enhancement effect of the twisted sheet tube is better, it cannot mechanically decoke the heat exchange tube equipped with the enhanced heat transfer element
However, a large part of the existing quenching boilers must be mechanically decoked, otherwise it will seriously affect the working effect and service life of the quenching boiler

Method used

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  • Quenching Boiler and Its Application
  • Quenching Boiler and Its Application
  • Quenching Boiler and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] The application of the quenching boiler equipped with enhanced heat transfer elements provided by the present invention in the quenching heat exchange system for hydrocarbon cracking process is illustrated.

[0092] Using the hydrogenated tail oil as the cracking raw material, the cracked gas with a temperature of 850°C is obtained after cracking in the cracking furnace by the above method, and the cracked gas obtained is quenched in the quenching boiler, wherein the heat exchange tube 10 in the quenching boiler is set There are 4 enhanced heat transfer elements, one of which is welded at the tube side inlet of the heat exchange tube 10 , and the other 3 enhanced heat transfer elements are uniformly welded in the heat exchange tube 10 . The enhanced heat transfer element is a first enhanced heat transfer element, that is, it includes a first twisted sheet 1 , and the first twisted sheet 1 has The upper side to the lower side run through the vertical hole formed. The in...

Embodiment 2

[0103] The application of the quenching boiler equipped with enhanced heat transfer elements provided by the present invention in the quenching heat exchange system for hydrocarbon cracking process is illustrated.

[0104] Naphtha is used as the cracking raw material to obtain cracked gas at a temperature of 850°C after being cracked in the cracking furnace by the above method, and the resulting cracked gas is quenched in the quenching boiler, wherein the heat exchange tube 10 in the quenching boiler is provided with 5 enhanced heat transfer elements, one of which is welded at the tube side inlet of the heat exchange tube 10 , and the other 4 enhanced heat transfer elements are uniformly welded in the heat exchange tube 10 . The enhanced heat transfer element is a second enhanced heat transfer element, that is, it includes a first twisted sheet 1 and a first sleeve 3 arranged in the first twisted sheet 1, and the inner edge of the first twisted sheet 1 It is connected with the...

Embodiment 3

[0115] The application of the quenching boiler equipped with enhanced heat transfer elements provided by the present invention in the quenching heat exchange system for hydrocarbon cracking process is illustrated.

[0116]Using ethane as the raw material for cracking and cracking in the cracking furnace by the above method to obtain cracked gas with a temperature of 850 ° C, and quenching the obtained cracked gas in a quenching boiler, wherein the heat exchange tube 10 in the quenching boiler is provided with 6 One enhanced heat transfer element is welded at the tube side inlet of the heat exchange tube 10, and the other five enhanced heat transfer elements are uniformly welded in the heat exchange tube 10. The enhanced heat transfer element is a third enhanced heat transfer element, that is, it includes a second twisted sheet 2 , and the second twisted sheet 2 has an edge-closed horizontal hole formed through the surface of the second twisted sheet 2 . The ratio of the area o...

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PUM

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Abstract

The invention provides a quenching boiler, wherein the quenching boiler has a heat exchange tube (10), the diameter of the heat exchange tube (10) is D, and an enhanced heat transfer element is arranged in the heat exchange tube (10) , the enhanced heat transfer element includes a twisted sheet with holes. The invention also provides the application of the quenching boiler in the chemical industry. Through the above technical proposal, twisted sheets with openings are added to the heat exchange tube 10, thereby reducing the diameter of the heat exchange tube of the quenching boiler, improving the heat transfer performance of the quenching boiler, reducing the loss of heat energy, and reducing the The coking rate of the quenching boiler can also enable the quenching boiler to perform on-line coking and mechanical decoking.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a quenching boiler provided with enhanced heat transfer elements, and the application of the quenching boiler in the chemical industry. Background technique [0002] In the ethylene cracking furnace, the cracking raw materials are pyrolyzed in the radiation section of the cracking furnace to produce a series of basic chemical raw materials such as ethylene, propylene, butadiene, benzene and toluene. The high-temperature cracked gas must be cooled in a short time, otherwise the yield of main products such as ethylene will be greatly reduced due to secondary reactions. Therefore, in order to prevent the occurrence of secondary reactions, when the inlet temperature is about 700-950°C, when the cracked gas passes through the partition wall heat exchanger for heat exchange and cooling, it must be cooled to 300-400°C within a short period of time (generally within 0.1s). ℃; at the sam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F13/00
Inventor 刘俊杰王国清张利军周先锋
Owner CHINA PETROLEUM & CHEM CORP