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Recovery tower reboiler heat source control system

A technology of control system and reboiler, which is applied in the direction of distillation adjustment/control, chemical instruments and methods, distillation separation, etc., can solve the problems of low adjustment accuracy, rising production cost, and large flow change, and achieve the effect of improving adjustment accuracy

Inactive Publication Date: 2021-03-05
中石油吉林化工工程有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In the existing technology, the caliber of the on-off valve can be made very large, for example, more than 1 meter; the regulating valve is affected by the flow characteristics, and it is difficult to make a large-caliber valve, resulting in a substantial increase in production costs
In addition, the large-diameter control valve can only use butterfly valves with approximately equal percentages, and the small changes in the valve opening will cause large flow changes and low adjustment accuracy, which will affect the product indicators of the tower, and even cause the entire device to run unstable.

Method used

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  • Recovery tower reboiler heat source control system

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Embodiment Construction

[0022] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that are used in the embodiments. Apparently, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without creative efforts.

[0023] When describing the embodiments of the present invention, the terms "vertical", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", " The orientation or positional relationship expressed by "horizontal", "top", "bottom", "inner" and "outer" is based on the orientation or positional relationship shown in the relevant drawings, which are only for the convenience of describing the present invention and simplifying the description, and It is not to indicate or imply that the device or element referred to must have a particu...

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Abstract

The invention relates to a recovery tower reboiler heat source control system which comprises a reboiler heat source main pipe (1) connected with a recovery tower reboiler; and a reboiler heat sourcebranch pipe (2) connected to the reboiler heat source main pipe (1) in parallel. A flow regulating valve (201) is arranged on the reboiler heat source branch pipe (2). The system further comprises a recovery tower temperature controller (3) used for monitoring the temperature in the recovery tower, comparing the measured temperature with a threshold and outputting the temperature to the flow regulating valve (201). The flow regulating valve (201) and the recovery tower temperature controller (3) carry out cascade regulation. The requirement for small-range flow control of the system can be met, and high-precision adjustment of the heat source flow can be achieved.

Description

technical field [0001] The invention relates to the field of acrylonitrile production, in particular to a recovery tower reboiler heat source control system. Background technique [0002] The production technology of acrylonitrile in the world is mainly based on propylene and ammoxidation. In recent decades, with the continuous upgrading of catalysts and continuous improvement of process flow, the technological route of producing acrylonitrile by propylene and ammoxidation still maintains a leading position. [0003] The process flow of the main unit of acrylonitrile includes: reaction part, recovery part, refining part and four-effect evaporation part. The recovery tower in the refining part is an extractive distillation tower with water as a solvent. The function of this tower is to recover and resolve acrylonitrile, hydrocyanic acid and acetonitrile from the absorption liquid (water-rich). Acrylonitrile and hydrocyanic acid are distilled from the top of the tower, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/32B01D3/42
CPCB01D3/322B01D3/42Y02P70/10
Inventor 陆玲李大伟王帅霍宝胜刘俊凯金娜吴楠王振兴杨忠祥
Owner 中石油吉林化工工程有限公司
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