阅读说明：本技术 一种贫油冷却工艺 (Lean oil cooling process ) 是由 梁广兰 郝立兵 邱增近 李永 于 2021-09-08 设计创作，主要内容包括：本发明涉及一种贫油冷却工艺,包括：S1、将粗苯工序中的贫油和富油通入第一贫富油换热器对贫油进行第一次降温处理；S2、将经过第一次降温处理后的贫油和经过第一次换热后的富油通入第二贫富油换热对贫油进行第二次降温处理；S3、将经过第二次降温处理后的贫油通入第一冷却器进行第三次降温处理；S4、将经过第三次降温处理后的贫油通入第二冷却器进行第四次降温处理,使贫油温度降低至预设温度再送至吸收塔。本发明的贫油冷却工艺,对贫油进行四次冷却处理,冷却效果好。并且在前两次利用富油与贫油进行热交换,可以对化工生产中的能量进行合理分配使用,不需要再额外增加冷凝器,从而节省能耗。(The invention relates to a lean oil cooling process, which comprises the following steps: s1, introducing the lean oil and the rich oil in the crude benzene process into a first lean-rich oil heat exchanger to carry out first temperature reduction treatment on the lean oil; s2, introducing the lean oil subjected to the first temperature reduction treatment and the rich oil subjected to the first heat exchange into a second lean rich oil for heat exchange to carry out second temperature reduction treatment on the lean oil; s3, introducing the lean oil subjected to the second temperature reduction treatment into a first cooler for a third temperature reduction treatment; and S4, introducing the lean oil subjected to the third temperature reduction treatment into a second cooler for fourth temperature reduction treatment, reducing the temperature of the lean oil to the preset temperature, and sending the lean oil to the absorption tower. The lean oil cooling process has the advantages that the lean oil is cooled for four times, and the cooling effect is good. And the rich oil and the lean oil are utilized for heat exchange in the first two times, so that the energy in the chemical production can be reasonably distributed and used, and a condenser is not required to be additionally arranged, thereby saving the energy consumption.)

1. A lean oil cooling process comprising:

s1, introducing the lean oil and the rich oil in the crude benzene process into a first lean-rich oil heat exchanger to carry out first temperature reduction treatment on the lean oil;

s2, introducing the lean oil subjected to the first temperature reduction treatment and the rich oil subjected to the first heat exchange into a second lean rich oil for heat exchange to carry out second temperature reduction treatment on the lean oil;

s3, introducing the lean oil subjected to the second temperature reduction treatment into a first cooler for a third temperature reduction treatment;

and S4, introducing the lean oil subjected to the third temperature reduction treatment into a second cooler for fourth temperature reduction treatment, reducing the temperature of the lean oil to the preset temperature, and sending the lean oil to the absorption tower.

2. The lean oil cooling process of claim 1 wherein the temperature of the lean oil prior to entering the first lean-rich heat exchanger is 165 ℃ to 200 ℃.

3. The lean oil cooling process of claim 1, wherein the lean oil is cooled to 65 ℃ to 80 ℃ after the second temperature reduction treatment.

4. The lean oil cooling process of claim 1 wherein the first cooler is a circulating water heat exchanger.

5. The lean oil cooling process of claim 4, wherein the temperature of the circulating water heat exchanger is 30 ℃ to 35 ℃.

6. The lean oil cooling process of claim 1 wherein the second cooler is a chilled water heat exchanger.

7. The lean oil cooling process of claim 6, wherein the chilled water temperature of the chilled water heat exchanger is 10 ℃ to 16 ℃.

8. The lean oil cooling process of claim 1 wherein the temperature of the lean oil after passing through the second cooler is between 25 ℃ and 30 ℃.

Technical Field

The invention belongs to the technical field of lean oil cooling, and relates to a lean oil cooling process.

Background

Benzene in the wash oil escapes at high temperature and is taken away by water vapor, water is removed through condensation and layering, finally benzene liquid can be obtained, the benzene liquid is removed, the wash oil with the solute removed is called lean oil, and the lean oil can be used as an absorption solvent to be sent into an absorption tower again for recycling after being cooled. The existing lean oil cooling mode has high energy consumption and poor cooling effect.

Disclosure of Invention

The invention aims to provide a lean oil cooling process, which solves the problems of high energy consumption and poor cooling effect in the conventional lean oil cooling mode.

To achieve the above object of the present invention, the present invention provides a lean oil cooling process comprising:

s1, introducing the lean oil and the rich oil in the crude benzene process into a first lean-rich oil heat exchanger to carry out first temperature reduction treatment on the lean oil;

s2, introducing the lean oil subjected to the first temperature reduction treatment and the rich oil subjected to the first heat exchange into a second lean rich oil for heat exchange to carry out second temperature reduction treatment on the lean oil;

s3, introducing the lean oil subjected to the second temperature reduction treatment into a first cooler for a third temperature reduction treatment;

and S4, introducing the lean oil subjected to the third temperature reduction treatment into a second cooler for fourth temperature reduction treatment, reducing the temperature of the lean oil to the preset temperature, and sending the lean oil to the absorption tower.

According to one aspect of the invention the temperature of the lean oil before entering the first lean-rich heat exchanger is 165-200 ℃.

According to one aspect of the invention, the lean oil is cooled to 65-80 ℃ after the second cooling treatment.

According to one aspect of the invention, the first cooler is a circulating water heat exchanger.

According to one aspect of the invention, the temperature of the circulating water heat exchanger is 30-35 ℃.

According to one aspect of the invention, the second cooler is a chilled water heat exchanger.

According to one aspect of the invention, the chilled water of the chilled water heat exchanger is at a temperature of 10 ℃ to 16 ℃.

According to one aspect of the invention, the temperature of the lean oil after passing through the second cooler is in the range of 25 ℃ to 30 ℃.

The lean oil cooling process has the advantages that the lean oil is cooled for four times, and the cooling effect is good. And the rich oil and the lean oil are utilized for heat exchange in the first two times, so that the energy in the chemical production can be reasonably distributed and used, and a condenser is not required to be additionally arranged, thereby saving the energy consumption.

Drawings

FIG. 1 schematically shows a flow diagram of a lean oil cooling process according to one embodiment of the invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.

The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.

Referring to fig. 1, the present invention provides a lean oil cooling process comprising: s1, introducing the lean oil and the rich oil in the crude benzene process into a first lean-rich oil heat exchanger to carry out first temperature reduction treatment on the lean oil; s2, introducing the lean oil subjected to the first temperature reduction treatment and the rich oil subjected to the first heat exchange into a second lean rich oil for heat exchange to carry out second temperature reduction treatment on the lean oil; s3, introducing the lean oil subjected to the second temperature reduction treatment into a first cooler for a third temperature reduction treatment; and S4, introducing the lean oil subjected to the third temperature reduction treatment into a second cooler for fourth temperature reduction treatment, reducing the temperature of the lean oil to the preset temperature, and sending the lean oil to the absorption tower.

Specifically, in the invention, the temperature of the lean oil before entering the first lean-rich oil heat exchanger is 165-200 ℃, and the temperature of the lean oil after the second temperature reduction treatment is 65-80 ℃. The first cooler is a circulating water heat exchanger. The temperature of the circulating water heat exchanger is 30-35 ℃. The second cooler is a refrigerating water heat exchanger. The temperature of the refrigerating water heat exchanger is 10-16 ℃. The temperature of the lean oil after passing through the second cooler is 25-30 ℃.

The lean oil cooling process has the advantages that the lean oil is cooled for four times, and the cooling effect is good. And the rich oil and the lean oil are utilized for heat exchange in the first two times, so that the energy in the chemical production can be reasonably distributed and used, and a condenser is not required to be additionally arranged, thereby saving the energy consumption.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.