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Scaling control method for debutanizer bottom reboiler of light hydrocarbon recovery device

A technology for recovery of debutanizer and light hydrocarbons, which is applied in chemical instruments and methods, separation methods, distillation adjustment/control, etc. Reduced reboiler heat transfer efficiency, limited reboiler steam flow, etc., to reduce reboiler scaling, slow down scaling rate, and improve scaling effects

Inactive Publication Date: 2021-02-05
恒力石化(大连)炼化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the light hydrocarbon recovery unit has been in operation for a period of time, the heat transfer efficiency of the debutanizer bottom reboiler decreases
The temperature and pressure at the condensate outlet rise slowly, which in turn leads to the restriction of the steam flow rate of the reboiler and the difficulty in raising the temperature at the bottom of the tower, which will eventually affect the separation of naphtha and liquid hydrocarbons in the debutanizer
The cause of the decrease in the heat transfer efficiency of the reboiler is the fouling on the outer wall of the tube side

Method used

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  • Scaling control method for debutanizer bottom reboiler of light hydrocarbon recovery device
  • Scaling control method for debutanizer bottom reboiler of light hydrocarbon recovery device
  • Scaling control method for debutanizer bottom reboiler of light hydrocarbon recovery device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] During the operation of the light hydrocarbon recovery unit, the antiscalant is injected into the feed section of the debutanizer, specifically before the feed pump, to facilitate the mixing of the antiscalant and naphtha. The injection amount of the antiscalant is 25-35mg / kg (based on the amount of feed to the debutanizer), that is, inject 25-35 mg of scale inhibitor per kg of feed, and the scale inhibitor used is Baker Hughes scale inhibitor BPR372133. Antiscalants are stored in buffer tanks under nitrogen blanketing.

[0034] According to the above method, two sets of identical light hydrocarbon recovery devices were tested.

[0035] The following are two sets of equipment 1# device and 2# device used by the applicant himself, using the experimental data after the application method.

[0036] Data selection based on:

[0037] (1) The debutanizer of the 2# unit has been overhauled twice, and the comparison is obvious;

[0038] (2) During the maintenance of 1# unit...

Embodiment 2

[0083] Use the method of Example 1 to inject the scale inhibitor. At the same time, inject the corrosion inhibitor at the top of the debutanizer. The minimum flow rate needs to be mixed evenly with the liquefied gas first, and then injected into the debutanization gas phase volatilization line. The amount of corrosion inhibitor used is 3-8mg / kg (based on the top liquefied gas flow rate of the debutanizer). Corrosion inhibitors are stored in buffer tanks under nitrogen blanketing.

[0084] On December 23, 2019, the corrosion inhibitor was injected into the top of the 2# debutanizer tower. By tracking and observing the feed buffer tank V0101 of the debutanizer tower and the iron ion content of the debutanizer reflux tank V0102, it was found that the injection of the corrosion inhibitor The content of iron ions in the water bag (as shown in the figure below) has dropped significantly (such as Figure 12 , Figure 13 shown).

[0085] By injecting the corrosion inhibitor and obs...

Embodiment 3

[0092] Generally, in order to reduce steam transmission loss in public workshops, supersaturated steam is usually used for transmission. However, due to the high degree of superheat of the steam entering the device at 3.6MPa, the steam needs to be cooled to the saturation temperature after entering the reboiler. During this period of time, the energy released by the steam is small and the temperature is relatively high. The rate is slower than that of the phase transition, so that the upper tube bundle of the reboiler maintains a high temperature for a period of time, forming a high temperature section. Increase the probability of high temperature polymerization of olefins at the tube bundle. Add a temperature and pressure reducer to the 3.6MPa heat source steam pipeline at the bottom of the debutanizer, and inject medium-pressure deoxygenated water to reduce the temperature of the steam at the bottom of the tower from 360°C to 280°C, and reduce the temperature of the steam in...

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Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a scaling control method for a debutanizer bottom reboiler of a light hydrocarbon recovery device. Themethod comprises the steps that a scale inhibitor is injected in the feeding stage of a debutanizer, and based on the feeding amount of the debutanizer, the injection amount of the scale inhibitor is25-35 mg / kg; a corrosion inhibitor can be injected into a gas-phase volatilization section at the top of the debutanizer, and the injection amount of the corrosion inhibitor is 3-8 mg / kg based on theflow of liquefied gas at the top of the debutanizer; and a temperature and pressure reducer can also be used on a heat source steam pipeline, and deoxygenated water is injected into the temperature and pressure reducer. The method effectively improves the scaling problem of the debutanizer bottom reboiler, reduces the scaling rate of the debutanizer bottom reboiler, reduces the overhaul frequencyof the debutanizer, and prolongs the operation period of the debutanizer.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a scaling control method for a reboiler at the bottom of a debutanizer of a light hydrocarbon recovery unit. Background technique [0002] After the light hydrocarbon recovery unit has been in operation for a period of time, the heat transfer efficiency of the debutanizer bottom reboiler decreases. The temperature and pressure at the condensate outlet rise slowly, which in turn leads to the restriction of the steam flow rate of the reboiler and the difficulty in raising the temperature of the bottom of the tower, which will eventually affect the separation of naphtha and liquid hydrocarbons in the debutanizer. The cause of the decrease in the heat transfer efficiency of the reboiler is fouling on the outer wall of the tube side. [0003] One of the causes of reboiler fouling is corrosion at the top of the debutanizer tower. There is no report of a light hydrocarbon rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/32B01D3/42
CPCB01D3/322B01D3/42
Inventor 胡海明苏其州赵志强杨书显汪文强张海峰马富祥程学浩崔晶洋
Owner 恒力石化(大连)炼化有限公司
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