Method and device for dehydration of glycol by extending coking period of tower-drier reboiler

A dehydration device and drying tower technology, applied in hydrolysis preparation, separation/purification of hydroxyl compounds, organic chemistry, etc., can solve the problem that the reboiler coking period cannot be alleviated, increase the flow rate of high-pressure steam, and accelerate coking on the inner tube wall of the tubes and other problems, to achieve the effect of avoiding the parking loss of coke cleaning, reducing sewage discharge, and saving the cost of coke cleaning

Inactive Publication Date: 2004-12-29
北京东方石油化工有限公司
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AI Technical Summary

Problems solved by technology

This ethylene glycol solution dehydration process in the prior art causes frequent unplanned shutdowns in actual operation and operation, because a layer of coke is formed very quickly on the inner tube wall of the reboiler tube, and the coke not only The heat transfer is extremely poor, and the diameter of the tubes is continuously reduced, and the inner wall of the tubes is also rough
Generally, it takes 3-6 months to stop and clean the coke, which makes it necessary to carry out several unplanned parking and coke cleaning in the planned parking overhaul cycle, which not only directly causes huge parking losses, but also increases a large amount of coke cleaning sewage
In order to ensure the normal operation of the ethylene glycol drying tower, even if the ethylene glycol solution in the tower kettle reaches the water content of 0.01%, it is necessary to increase the flow rate of high-pressure steam to the reboiler, which greatly increases the capacity of the reboiler. The thermal load of the reboiler, that is, the flow rate of high-pressure steam is further increased, so the vicious cycle makes Reboiler Coking Cycle Cannot Be Relieved

Method used

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  • Method and device for dehydration of glycol by extending coking period of tower-drier reboiler
  • Method and device for dehydration of glycol by extending coking period of tower-drier reboiler

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Embodiment 1

[0029] The feed temperature of the ethylene glycol solution into the drying tower is 95°C. The drying tower and the drying tower reboiler have been in normal operation for about 6 months, and they need to be stopped to clean the coke. During this period, the drying tower evaporates or the drying efficiency decreases. By increasing the reboiler The high-pressure steam input to the dryer maintains the normal operation of the drying tower until it is shut down due to coking in the reboiler of the drying tower. In fact, the ethylene glycol solution at 95°C can be directly obtained from the bottom liquid of the vacuum tower of the evaporation system through temperature control, that is to say, there is no need to add an additional ethylene glycol solution preheating device.

Embodiment 2

[0031] The feed temperature of the ethylene glycol solution into the drying tower is 130°C. The drying tower and the reboiler of the drying tower have been in normal operation for more than 6 months. The reboiler of the drying tower has not been coked. The reduction, however, is cumbersome to preheat the glycol solution. It can be seen that the setting of this process parameter is conducive to solving the problem of coking in the reboiler of the drying tower.

Embodiment 3

[0033] Raise the feed temperature, change from cold feed to bubble point feed, that is, heat the 95°C tower kettle liquid through the preheater to 115°C before entering the drying tower. At this time, the feed temperature is basically the same as the feed plate temperature. This reduces the heat load on the reboiler and eases the reboiler coking cycle.

[0034] We officially installed it in 2000. The feed temperature was heated from 95°C to 115°C with medium-pressure steam at 300kg / h. It is basically the same, but the machine cleaning fee saved in two years is considerable, the avoided waste water is amazing, and the benefits to the enterprise are huge.

[0035] The ethylene glycol dehydration device for prolonging the coking cycle of the drying tower reboiler of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] Such as figure 2The shown ethylene glycol dehydration process device of the present invention ...

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Abstract

The glycol dewatering method for delaying the scaling period of reboiler in drying tower includes the control on the material temperature of drying tower, and features that the glycol solution temperature is 95-130 deg.c. The present invention also provides a glycol dewatering apparatus related to the method for delaying the scaling period of reboiler in drying tower. The method of the present invention can decrease the scaling speed of the reboiler obviously to reduce stop loss, lower cost in descaling, reduce drained sewage and protect environment.

Description

technical field [0001] The invention relates to a process technology and equipment for ethylene glycol dehydration in petrochemical production, in particular to an ethylene glycol dehydration method and a dehydration device for prolonging the coking period of a drying tower reboiler. Background technique [0002] Ethylene oxide reacts with water to form ethylene glycol solution (including diethylene glycol and triethylene glycol). The ethylene glycol solution passes through an evaporation system composed of several towers, and after evaporating the water content therein to the ethylene glycol solution with a water content of 15%, it is transported to the ethylene glycol drying tower by a centrifugal pump. The normal value of the temperature design is 89°C, which is the feed temperature of the ethylene glycol drying tower; then, high-pressure steam is used to provide heat source for the thermosiphon reboiler of the drying tower; when the ethylene glycol solution in the tower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/10C07C29/78C07C31/20
Inventor 张振友陈家雄
Owner 北京东方石油化工有限公司
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