Desalination and dehydration method and device for oily waste

A dehydration device and waste technology, which are applied in separation methods, grease/oily substance/float removal devices, mining wastewater treatment, etc., can solve the problems of desalination and dehydration that are easily affected by the properties of raw materials, poor desalination effect, and short settling time. , to achieve good desalination effect, good effect and strong safety effect

Active Publication Date: 2021-12-17
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a short settling time, good desalination and dehydration effect and desalination and dehydration method for the defects of low efficiency, poor desalination effect and easily affected by raw material properties of the existing waste oil / sludge desalination and dehydration method. Method and device for desalination and dehydration of oily waste with stable effect

Method used

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  • Desalination and dehydration method and device for oily waste

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Comparison scheme
Effect test

Embodiment 1

[0072] This example is used to illustrate the method for desalting and dehydrating oily waste of the present invention.

[0073] use figure 1 The shown device pumps dirty oil (water content is 37% by weight, salt content is 453mg NaCl / L, mechanical impurity is 3.3% by weight, and the balance is oil content) from inlet 9 to dehydration tank 1, through The U-shaped flow channel provided at the inlet 9 enters the main body of the dehydration tank 1, and then the pressure reducing valve 8 is closed to keep the dehydration tank 1 in a closed state, and the microwave reactor 2 is opened to carry out microwave heating to the dirty oil in the dehydration tank 1 ( The radiation frequency is 2450MHz, the power is 1200W), and when the temperature of the dirty oil is stabilized to 130°C, stop heating, and after the pressure in the dehydration tank is stabilized, the pressure relief valve 8 is opened to reduce the pressure in the dehydration tank 1 to normal pressure (approximately 101.3k...

Embodiment 2

[0076] This example is used to illustrate the method for desalting and dehydrating oily waste of the present invention.

[0077] According to the method described in embodiment 1, the difference is:

[0078] The treated oily waste is oil tank bottom sludge with a water content of 40.17% by weight, a salt content of 714mg NaCl / L, and mechanical impurities of 14.8% by weight;

[0079] The conditions of microwave heating include: the radiation frequency is 2450MHz, and the power is 1500W;

[0080] Microwave heating until the temperature of the oil sludge is 120°C, the condensed water collected in the light component reflux tank 6 after pressure relief accounts for 6% by weight of the water in the waste oil;

[0081] The moment the pressure is released, the temperature of the residual material in the dehydration tank 1 reaches 70° C., and it is kept at 70° C. for 30 minutes.

[0082] Wherein, the water content of the obtained purified oil was 0.9% by weight, and the dehydration ra...

Embodiment 3

[0084] This example is used to illustrate the method for desalting and dehydrating oily waste of the present invention.

[0085] According to the method described in embodiment 1, the difference is that the temperature of the waste oil heated by microwaves is 100° C., and the condensed water collected in the light component reflux tank 6 after pressure relief accounts for 2% by weight of the water in the waste oil.

[0086] Thus, the water content of the obtained purified oil was 13.1% by weight, and the dehydration rate was 64.6%; the salt content was 194 mg NaCl / L, and the desalination rate was 57.2%.

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Abstract

The invention relates to the field of waste oil or sludge treatment, in particular to a method and device for desalting and dehydrating oily waste. The desalination and dehydration method of the oil-containing waste includes: (1) microwave heating the oil-containing waste in a closed system to obtain superheated material; (2) decompressing the overheated material so that the oil-containing waste The water below 60% by weight is vaporized to obtain vaporized steam and residual material; (3) the residual material is subjected to static stratification to obtain the purified oil of the upper layer and the saline sewage of the lower layer. The method for desalting and dehydrating oily waste of the present invention has short settling time, good and stable desalting and dehydrating effect.

Description

technical field [0001] The invention relates to the field of waste oil or sludge treatment, in particular to a method and device for desalting and dehydrating oily waste. Background technique [0002] Crude oil extraction, gathering and refining processes usually produce a certain amount of dirty oil and sludge with different properties. In oil field operations, dirty oil and sludge are mainly produced in various links such as drilling operations, oil recovery, gathering and transportation, and sewage treatment. huge environmental pressure and economic pressure. In the crude oil refining process, dirty oil and sludge are mainly produced in oil tank farms, crude oil electric desalination, sewage grease traps and other units. The basic components of sewage oil and oil sludge are similar, mainly composed of oil, sediment, organic sludge, surfactant and a large amount of water, while the content of mechanical impurities such as sediment in sewage oil is relatively low. They a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/40C10G53/02C02F103/10
CPCC10G53/02C02F1/40C02F2103/10C10G2300/208C10G2300/1033
Inventor 赵锐李本高沈明欢袁清马欣曹晓磊杨宇宁
Owner CHINA PETROLEUM & CHEM CORP
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