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Device and method for purifying butane by tower pressure stable type debutanizer

A debutanizer and fixed-type technology, applied in the field of natural gas processing, can solve the problems of unqualified product quality and easy fluctuation of tower operating pressure, and achieve the effect of rapid control and stabilization of light hydrocarbon quality indicators

Pending Publication Date: 2020-10-09
XIAN CHANGQING TECH ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The basic condition for the stable operation of the debutanizer is that the operating pressure of the tower should be stable. However, due to the influence of the installation size or the change of the amount of raw materials, the biggest problem encountered in the actual production of the debutanizer is that the operating pressure of the tower is easy to fluctuate. resulting in substandard product quality

Method used

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  • Device and method for purifying butane by tower pressure stable type debutanizer

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Experimental program
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Effect test

no. 1 approach

[0048] The first embodiment of the present invention relates to a method for purifying butane in a pressure-stabilized debutanizer, referring to figure 1 , including the following steps:

[0049] S1, transfer C from outside the boundary area 4 + After the mixed hydrocarbon 1 is metered and adjusted, it is introduced into the middle and upper part of the debutanizer 2;

[0050] S2, introducing step S1 into C of debutanizer 2 4 + The mixed hydrocarbon 1 is divided into two phases of gas and liquid in the tower, and its liquid phase descends and contacts with the rising gas phase for mass transfer and heat transfer, the top of the debutanizer 2 discharges the gas phase stream, and the tower bottom discharges the liquid phase stream;

[0051] S3, the temperature of the gas phase stream discharged from the top of the debutanizer 2 is detected, and divided into two streams, the main stream and the secondary stream. ~48°C, all the gas phase is condensed into liquefied gas;

[0...

no. 2 approach

[0061] This embodiment relates to a device for purifying butane in a pressure-stabilized debutanizer, such as figure 1 As shown, it includes at least a debutanizer 2, a slanted top air cooler 7, a reflux tank 10, a reflux pump 16, a reboiler 3 and a bottom cooler 24, and the upper side wall of the debutanizer 2 is provided with The raw material inlet, the top of the debutanizer 2 is provided with a gas phase outlet, and the bottom of the tower is provided with a liquid phase inlet and a liquid phase outlet;

[0062] C 4 + The mixed hydrocarbon 1 enters the debutanizer 2 through the raw material inlet in the upper part of the debutanizer 2, and the gas phase outlet at the top of the debutanizer 2 is connected to the inlet of the inclined-top air cooler 7 through pipeline 1, and the inclined-top air cooler 7 The outlet communicates with the liquid inlet of the reflux tank 10 through pipeline two, and the gas phase outlet on the top of the reflux tank 10 discharges the product ...

no. 3 approach

[0065] On the basis of the second embodiment, further, the reboiler 3 is provided with a reboiler liquid inlet 18, a reboiler liquid outlet 19, a heat transfer oil inlet and a heat transfer oil outlet, and the heat transfer oil of the reboiler 3 The inlet is connected to the high-temperature heat transfer oil 22 through the oil inlet pipeline, and the heat transfer oil outlet of the reboiler 3 is connected to the low-temperature heat transfer oil 23 through the oil outlet pipeline. The towers 2 are connected, and the reboiled liquid inlet 18 is located above the reboiled liquid outlet 19 . The oil inlet pipeline is equipped with a heat transfer oil temperature regulating valve 27 and a tower kettle temperature detector 17. Specifically, one end of the tower kettle temperature detector 17 is connected to the debutanizer 2, and the tower kettle temperature detector 17 The other end is connected with the heat transfer oil temperature regulating valve 27. The tower kettle tempera...

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Abstract

The invention provides a device and method for purifying butane by a tower pressure stable type debutanizer. The device at least comprises a debutanizer, an inclined top air cooler, a reflux tank, a reflux pump, a reboiler and a tower bottom cooler, the method is based on a hot bypass mode, a regulating valve is added from an air cooler to a liquefied gas inlet in the bottom of a return tank to control the liquid level of the liquid level air cooler, the effect of the regulating valve can counteract the influence of the pressure difference of the hot bypass regulating valve so as to reduce thestrict requirement for the installation height difference of the tower top air cooler and a return tank, and the limitation of too small hot bypass gas amount is reduced. According to the invention,the mounting height of the tower top air cooler and the mounting height of the return tank can be randomly determined according to self mounting conditions without limitation, in the operation process, the liquid level submerging height of the air cooler is controlled by manually adjusting the opening degree of the liquid level adjusting valve according to the installation positions of the tower top air cooler and the return tank and the actual pressure difference of the bypass adjusting valve in combination with the cooling load of the air cooler so as to meet the tower pressure adjusting requirement.

Description

technical field [0001] The invention belongs to the field of natural gas processing, and in particular relates to a device and method for purifying butane in a column-pressure-stabilized debutanizer. Background technique [0002] Ethane is a high-quality raw material for ethylene. The production cost of cracking ethane to ethylene is two-thirds of naphtha. In the world, ethylene raw materials C2-C4 account for about 48%. However, due to the constraints of raw materials in my country, naphtha Mainly. Recovering ethane products from natural gas and using them as raw materials for ethylene production by steam thermal cracking has positive significance for increasing the output of ethylene products, reducing energy consumption of ethylene plants, and improving quality and efficiency. [0003] Debutanizer is one of the key equipment in natural gas ethane recovery project, its main function is to complete the separation of liquefied gas and stable light hydrocarbon components, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C07C7/00C07C9/10
CPCC07C7/005C10L3/08C07C9/10
Inventor 刘子兵常志波粱璇玑邱鹏范君来张璞韩万龙韦玮薛政赵东升
Owner XIAN CHANGQING TECH ENG
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