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Zawartość zarchiwizowana w dniu 2022-12-27

CONTINUOUS AND SELECTIVE RECOVERY OF HYDROCARBON FILMS FROM THE SURFACE OF WATER

Cel

The aim of this project, which in 1981 won for ELF-Aquitaine the Raymond Delaby prize, was to develop a process for the continual selective recovery of hydrocarbons collection on the surface of petrol refinery water/oil gravity separators, in order to limit losses by evaporation and reduce the costs of removing water from the recovered oil prior to recycling.
An oil-recovery drum consists of a cylinder coated with oleophilic material. It is rotated continuously through the surface layer of the water so as to pick up the oil, which is then recovered by a fixed scraper and piped to existing collection systems.
The aim of installing oleophilic dauws on new or existing water/oil separators is to save energy in two ways:
- by recovering water free oil and
- by reducing evaporation due to the reduced residence time of oil on the separator's surface.
Eight water/oil separators were equipped with the new technology for the demonstration project. They are used as a means of primary gravity treatment for the removal of oil from aqueous effluents. Altogether they treat between 700 and 900 m3/hour of oily water.
All eight separators were fitted with oleophilic drums. The capital cost (construction and associated costs) was FF 1 million (1981) prices.
The energy saving was 2200 toe/year, 1500 toe/year from the removal of water from the recovered oil prior to recycling and 700 toe/year due to reduced evaporation.
The resulting capital cost per unit saving, for the entire demonstration project, is FF 450/toe.
The aggregate cost of the demonstration project, including instrumentation and data-logging, was FF 2.8 million.
The project demonstrated a number of benefits additional to energy saving.
- reduced evaporation means that the separators produce less smell.
- regular monitoring showed a considerable improvement in oil content at the outlet from the gravity separators.
- the introduction of automatic oil-film recovery systems brought improvements in the operation of the gravity separators and the working conditions of the operatives who previously had to remove the surface film manually. The estimated labour saving for the entire demonstration project was one person/shift.
- the process can be introduced without modifying the separators themselves.
- operating and maintenance costs recorded during the demonstration project were negligible owing to the simplicity of the technology.
Performance, in terms of oil recovery, depends on the length of the oleophilic drum, the linear speed of its periphery and the oil viscosity.
Drum diameter is between 200 and 700 mm depending on the type of installation and the application.
The ELF ANVAR process can be used the full range of water/hydrocarbon product separators.
The fields of application mentioned below by way of example represent the most profitable markets.
A study carried out recently reveals a market in France, outside the oil sector, for about 200 installations of medium or large size (similar to the refining sector) and for more than 1000 very small or small units (oelophilic drums of 0.5 to 1 m in length).
A market study is currently being carried out in Germany (all sectors), the Netherlands (oil sector), the USA and Canada (all sectors).
In the framework of the demonstration project, installations were built in the Feyzin, Vexin, Grandpuits and Ambes refineries. Each site presented different conditions and hosted equipment of varying design.
FEYZIN.
The first prototype was installed in this refinery and led to the final development of those separators used, subsequently in Fezin and the other refineries.
Characteristic:
Oleophile cylinder length : 2 x 1600 mm
diameter : 400 mm
speed of rotation : 12 - 48 rpm
start up : 1979
Two separators were then used, each treating about 50 m3/hr of process water. The recovered oil was subsequently stored in heated storage tanks in order to assure further dehydration prior to recycling .
The characteristics of the two later installations:
cylinder length : 1200mm
diameter : 750mm
speed of rotation : 6 or 12 rpm
start-up : 1980
AMBES.
This small refinery rejects liquid effluent (100 m3/hr) to water/oil gravity separators. Upstream is a predecantation chamber where almost all the hydrocarbons collect on the surface; it is here that one recovery unit is operated. A second unit operates on the separators and a third is kept in reserve so that each separator may be cleaned without stopping the recovery process. The relatively water-free product is treated as in Feyzin prior to recycling.
Characteristics:
cylinder length : 2 x 700 mm
diameter : 600 mm
rotation speed : 4-24 rpm
VEXIN
This refinery produces oily process water, and other oil waste amounting to a total volume of some 200 m3/hr which is sent to two water/oil separators.
Characteristics:
cylinder length : 1400 mm
diameter : 400 mm
rotation speed : 15-40 rpm
GRANDPUITS
About 100 m3/hr of saline water is treated in the installation sited as above in a water/oil separator. Characteristcs: cylinder length : 2 * 1400 mm diameter : 400 mm rotation speed : 15 or 5

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Koordynator

Elf Aquitaine Production
Wkład UE
Brak danych
Adres
26 avenue des lilas
64018 Pau
Francja

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