CN101050051A - Hot chemical treatment method for oil sludge falling to the ground - Google Patents

Abstract

This invention relates to a method for thermal and chemical treatment of the mixture crude oil and soil in oilfield. The method comprises: screening the mixture crude oil and soil primarily, performing cyclone hot washing on the mixture crude oil and soil with hot wastewater solution from oilfield wastewater treatment plant in a washing tank at certain temperature and liquid/solid ratio, performing solid/liquid separation on hot-washed oil-containing slurry with a centrifugal separator, and processing waste oil, wastewater mud and sand. The method has such advantages as simple process, low apparatus investment, and high oil recovery rate. The method can realize large-scale reduction of contaminants in the mixture crude oil and soil, and is environmentally friendly.

Description

A kind of hot chemical treatment method for oil sludge that lands

Technical field:

The present invention relates to a kind of processing method that is used for oil field oil-containing sludge treatment, environment protection, belong to the environment protection waste and administer technical field.

Background technology:

Land oily sludge as a kind of important pollutent and source of pollution, and more and more big to the harm of environment, its innoxious governance problem is extremely urgent.Particularly the oily sludge that brought in the oil recovery production process of viscous crude field is more and more, burden is bigger, comprising the scum silica frost of sewage treatment process, jar end mud etc., these mud that contain viscous crude are mobile poor, the viscosity height, contain a large amount of organic and inorganic chemistry medicaments, to the environment structure severe contamination.At present, both at home and abroad greasy filth is handled the theoretical investigation carried out to a certain degree and useful technology is attempted, set up preliminary technology mode and corresponding processing unit.Usually oily sludge is handled the method that is adopted and mainly be divided into four classes, be that physical method (burns, hot melt glassization, thermosol is centrifugal), physico-chemical process (solvent extraction, stripping, the leaching flushing, solvent-sonic treatment), chemical process (oxygenant oxidation, supercritical oxidation), biological method (bio-oxidation, microorganism breakdown of emulsion), by above-mentioned technological method, utilize dedicated treatment facility that oily sludge is carried out crude separation and Pollution abatement.Above-mentioned treatment process respectively has characteristics, and can obtain certain effect, but exists deficiencies such as facility investment is big, complex process, running cost is higher, the Oil Recovery rate is low respectively, especially viscous crude, super viscous crude is landed greasy filth and does not still have complete feasible method.

Summary of the invention:

The object of the invention is to provide a kind of can effectively the processing to land greasy filth and reclaim the hot chemical treatment method for oil sludge that lands that wherein mineral oil is realized oily sludge minimizing, innoxious, resource utilization.

Technical scheme of the present invention is as follows:

It is earlier to landing the preliminary sorting of greasy filth that this kind lands hot chemical treatment method for oil sludge, adopting the hot sewage solution of oil extraction-generated waste water treatment plant under certain temperature, liquid-solid ratio condition greasy filth to be carried out eddy flow heat then in purge tank washes, oil-cut mud after by centrifugal separation equipment heat being washed again carries out solid-liquid separation, and sump oil, sewage, silt particle are handled respectively.The implementation step of this method is as follows:

1, letter sorting pre-treatment: tentatively sort to landing greasy filth, remove the impurity that is unfavorable for follow-up cleaning or burning in the greasy filth, the direct landfill of bulk inanimate matter, place mat road well site or make material of construction, organic through airing oven dry back burning, decrement is more than 20% after the pre-treatment;

2, eddy flow heat is washed: the greasy filth that lands after the letter sorting enters in the purge tank heat and washes processing, heat is washed to adopt and is stirred cage eddy flow elutriation decrement method, utilizes the oil extraction-generated waste water treatment plant hot sewage of oil trap to clean, and cleaning temperature is controlled at 50-70 ℃, the solid-liquid ratio was at 3: 1～5: 1, and scavenging period is 20-40min.The clean-out system add-on is 100～300mg/L; The oleaginousness of separating after the cleaning is higher than 10% oil-containing mud sand to be sent into clearly a jar greasy filth treatment system and handles, and oleaginousness is lower than 10% dries burning;

3, mud centrifuge dehydration:

Wash the oil-cut mud of equipment discharge from heat and send into centrifugal separation equipment, carry out solid-liquid separation, centrifugation adopts horizontal spiral centrifuge to separate, and mainly is the separation between solid and the liquid, and it is settlement separate voluntarily to enter Chu Chi after the profit;

4, the heat aftertreatment of washing, dewater:

1. oil-containing mud sand is sent into the preliminary mummification in airing field, after sending into drying plant again and handling, delivers to the incinerator burning disposal;

2. send into sewage work behind the sewage collecting and focus on qualified discharge;

3. send storage tank to store after sump oil is collected, handle outside the back and sell.

This method has following technical characterstic:

This technology is utilized the hot sewage of sewage work, but adopts circular treatment conserve water resource, and core system has temperature control unit and steam tracing, and temperature can be stablized and is controlled at 70 ℃; Cylinder in the core processing system adopts speed control by frequency variation, regulates drum speed according to the content of greasy filth PetroChina Company Limited. class, reaches treatment effect; Nucleus equipment adopts the rotating intermittent type to handle, and avoids the impurity in the domestic refuse to be wound on the cylinder, makes that simultaneously the silt particle in the greasy filth has enough residence time to be deposited to device bottom; Because temperature about 70 ℃, under acid breakdown of emulsion air supporting effect, can reach the purpose of greasy filth PetroChina Company Limited. class flotation by the intermittent type rotation; This process treatment time is short, and the automation degree of equipment height is so treatment capacity is big.

Technology of the present invention is simple, and facility investment is few, and running cost is low, and Oil Recovery rate height utilizes this method can obtain good treatment effect, realizes landing significantly decrement of greasy filth pollutent, helps environment protection.

Description of drawings:

Accompanying drawing lands greasy filth thermochemistry clean main part process flow diagram for what the present invention adopted.

Embodiment:

The present invention is provided by following examples, is illustrated below in conjunction with accompanying drawing.

As shown in the figure, will land greasy filth according to the diagram flow process during the invention process and handle, and can reach and reclaim oil product and effectively dispose of sewage, the silt particle pollutent, protect the purpose of environment by aforementioned implementation step.

Claims (1)

1, a kind of hot chemical treatment method for oil sludge that lands, it is characterized in that: this method is earlier to landing the preliminary sorting of greasy filth, adopting the hot sewage solution of oil extraction-generated waste water treatment plant under certain temperature, liquid-solid ratio condition greasy filth to be carried out eddy flow heat then in purge tank washes, oil-cut mud after by centrifugal separation equipment heat being washed again carries out solid-liquid separation, and sump oil, sewage, silt particle are handled respectively; The implementation step of this method is as follows:

(1), letter sorting pre-treatment: tentatively sort to landing greasy filth, remove the impurity that is unfavorable for follow-up cleaning or burning in the greasy filth, the direct landfill of bulk inanimate matter, place mat road well site or make material of construction, organic through airing oven dry back burning, decrement is more than 20% after the pre-treatment;

(2), eddy flow heat is washed: the greasy filth that lands after the letter sorting enters in the purge tank heat and washes processing, heat is washed the cage eddy flow elutriation decrement method of stirring that adopts, utilize the oil extraction-generated waste water treatment plant hot sewage of oil trap to clean, cleaning temperature is controlled at 50-70 ℃, the solid-liquid ratio was at 3: 1～5: 1, scavenging period is 20-40min, and the clean-out system add-on is 100～300mg/L; The oleaginousness of separating after the cleaning is higher than 10% oil-containing mud sand to be sent into clearly a jar greasy filth treatment system and handles, and oleaginousness is lower than 10% dries burning;

(3), mud centrifuge dehydration:

Wash the oil-cut mud of equipment discharge from heat and send into centrifugal separation equipment, carry out solid-liquid separation, centrifugation adopts horizontal spiral centrifuge to separate, and mainly is the separation between solid and the liquid, and it is settlement separate voluntarily to enter Chu Chi after the profit;

(4), the heat aftertreatment of washing, dewater:

1. oil-containing mud sand is sent into the preliminary mummification in airing field, after sending into drying plant again and handling, delivers to the incinerator burning disposal;

2. send into sewage work behind the sewage collecting and focus on qualified discharge;

3. send storage tank to store after sump oil is collected, handle outside the back and sell.

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