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High-efficiency recovery system for low-temperature waste heat of xylene heating furnace

A low-temperature waste heat recovery system technology, applied in the field of petrochemical industry, can solve the problems of low recovery efficiency of low-temperature waste heat and limited flue gas discharge temperature, and achieve the effects of reducing operating energy consumption, avoiding dew point corrosion, and large surface area

Active Publication Date: 2021-11-16
NINGBO ZHONGJIN PETROCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to overcome the low-temperature waste heat recovery system of the xylene heating furnace in the prior art. High flue gas discharge temperature can avoid the equipment from being corroded, causing the flue gas to carry a large amount of heat to be discharged through the chimney, and the recovery efficiency of low-temperature waste heat is low. A high-efficiency recovery system for low-temperature waste heat of xylene heating furnace is provided. The anti-corrosion unit removes the acid gas in the fuel gas through the anti-corrosion reactor in the anti-corrosion reactor, so as to avoid the dew point corrosion of the equipment at low flue gas discharge temperature, and can efficiently recover the heat of the flue gas discharged from the heating furnace, significantly improving The thermal efficiency of the heating furnace reduces the energy consumption of the device operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The intake rate of the fuel gas in Example 1 is 10t / h; the loading amount of the corrosion inhibitor in the first corrosion inhibition reactor is 22.5t, and the loading volume of the corrosion inhibitor in the second and the third corrosion inhibition reactor is 30t .

[0046] The preparation method of corrosion inhibitor is:

[0047] (1) Mix zeolite powder, KOH powder and pseudo-boehmite powder uniformly in a mass ratio of 50:7:12 to obtain powder;

[0048] (2) Turn on the granulator, adjust the rotating speed to 25rpm, add the powder into the granulator, and gradually add 25wt% nitric acid solution as a binding agent at the same time, and carry out rotational molding to obtain balls with a particle size of 4mm. The mass ratio of the addition of agent and the zeolite powder in the powder is 26:50;

[0049] (3) Place the pellets in an airtight container and age them for 36 hours;

[0050] (4) The corrosion inhibitor is obtained by activating the aged pellets at a hig...

Embodiment 2

[0052] The intake rate of fuel gas in Example 2 is 10t / h; the loading amount of corrosion inhibitor in the first corrosion inhibitor reactor is 22.5t, and the loading amount of corrosion inhibitor in the second and third corrosion inhibitor reactors is 30t .

[0053] The preparation method of corrosion inhibitor is:

[0054] (1) Mix zeolite powder, KOH powder and pseudo-boehmite powder uniformly in a mass ratio of 50:6:10 to obtain powder;

[0055] (2) Turn on the granulator, adjust the rotating speed to 25rpm, add the powder into the granulator, and gradually add 20wt% nitric acid solution as a binding agent at the same time, carry out rotational molding, and obtain a material ball with a particle diameter of 3mm, bonded The mass ratio of the addition of agent and the zeolite powder in the powder is 25:50;

[0056] (3) Place the pellets in an airtight container and age them for 24 hours;

[0057] (4) The corrosion inhibitor is obtained by activating the aged pellets at a h...

Embodiment 3

[0059] The intake rate of fuel gas in Example 3 is 10t / h; the loading amount of corrosion inhibitor in the first corrosion inhibitor reactor is 22.5t, and the loading amount of corrosion inhibitor in the second and third corrosion inhibitor reactors is 30t .

[0060] The preparation method of corrosion inhibitor is:

[0061] (1) Mix zeolite powder, KOH powder and pseudo-boehmite powder uniformly in a mass ratio of 50:8:15 to obtain powder;

[0062] (2) Turn on the granulator, adjust the rotating speed to 25rpm, add the powder into the granulator, and gradually add 30wt% nitric acid solution as a binding agent at the same time, carry out rotational molding, and obtain a material ball with a particle diameter of 5mm, bonded The mass ratio of the addition of agent and the zeolite powder in the powder is 27:50;

[0063] (3) Place the pellets in an airtight container and age them for 48 hours;

[0064] (4) The corrosion inhibitor was obtained by activating the aged pellets at a ...

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Abstract

The invention discloses a high-efficiency recovery system for the low-temperature waste heat of a xylene heating furnace. The high-efficiency recovery system for the low-temperature waste heat of the xylene heating furnace comprises a heat exchange unit and a corrosion inhibition unit. The heat exchange unit comprises a heating furnace, a fuel gas-flue gas heat exchanger, an air preheater, a chimney and an exhaust inlet; the exhaust inlet is connected with the air preheater and a combustion chamber of the heating furnace through air pipelines; a flue gas outlet of the heating furnace is connected with inlets of the fuel gas-flue gas heat exchanger and the air preheater through flue gas pipelines; outlets of the fuel gas-flue gas heat exchanger and the air preheater are connected with the chimney through flue gas pipelines; a corrosion inhibition reactor is arranged in the corrosion inhibition unit; an inlet of the corrosion inhibition reactor is connected with the fuel gas-flue gas heat exchanger through a fuel gas pipeline; and an outlet of the corrosion inhibition reactor is connected with the combustion chamber of the heating furnace through a fuel gas pipeline. According to the high-efficiency recovery system for the low-temperature waste heat of the xylene heating furnace provided by the invention, the corrosion inhibition unit is arranged in the system, and acid gas in fuel gas is removed through a corrosion inhibitor, so that dew point corrosion at the low flue gas emission temperature is avoided, heat of flue gas can be efficiently recycled, and the heat efficiency of the heating furnace is remarkably improved.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a high-efficiency recovery system for low-temperature waste heat of a xylene heating furnace. Background technique [0002] Aromatic hydrocarbons are one of the most basic raw materials in organic chemistry, among which benzene, toluene and xylene are the basic raw materials of petrochemical industry, and are widely used in the fields of medicine, building materials, military and pesticide manufacturing. Xylene heating furnace is an important heat source of aromatics plant, and there is a large amount of low-temperature waste heat in the operation process. Fully recycling these low-temperature waste heat is one of the important ways to save energy and reduce consumption of aromatics plant, and it is also an important research for petrochemical enterprises in my country. content. [0003] At present, the most widely used low-temperature waste heat recovery method in the petro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00F23J15/06F23L15/00B01D53/02B01J20/04
CPCF27D17/004F23J15/06F23L15/00B01D53/02B01J20/04Y02E20/34Y02P10/25
Inventor 汪海洋倪永生宋杰
Owner NINGBO ZHONGJIN PETROCHEM CO LTD
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