CN112250212A

CN112250212A - Separation treatment device and separation treatment process

Info

Publication number: CN112250212A
Application number: CN202010976342.2A
Authority: CN
Inventors: 裴巧定; 何承宏; 裴洁
Original assignee: Chongqing Kunquan Environmental Engineering Co ltd
Current assignee: Chongqing Kunquan Environmental Engineering Co ltd
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-01-22

Abstract

The invention discloses a separation treatment device and a separation treatment process, and relates to the technical field of oil stain treatment. This separation processing apparatus includes silt separation component and oil-water separation component, silt separation component is including the prewashing rabbling mechanism and the solid-liquid separation mechanism that connect gradually, oil-water separation component and solid-liquid separation mechanism's liquid phase exit linkage, the prewashing rabbling mechanism is used for simultaneously to oiliness silt and the heating of drilling and production waste water and stirring to form first mixed liquid, solid-liquid separation mechanism is arranged in following the first mixed liquid and separates silt, and forms the second and mixes the liquid, oil-water separation component is arranged in following the second and mixes liquid and separates clear water and greasy dirt. The separation treatment device and the separation treatment process have the characteristics of low separation cost and good separation effect.

Description

Separation treatment device and separation treatment process

Technical Field

The invention relates to the technical field of oil stain treatment, in particular to a separation treatment device and a separation treatment process.

Background

The oil well can produce drilling and production waste water (fracturing fluid containing oil pollution impurities) and pollutants such as ground oil polluted soil in the operation process, most of the prior treatment processes are to separately treat the drilling and production waste water and the oil-containing silt (formed by the ground oil polluted soil), and the treatment cost is expensive.

In view of the above, it is important to develop a separation apparatus and a separation process that can solve the above problems.

Disclosure of Invention

The invention aims to provide a separation treatment device which has the characteristics of low separation cost and good separation effect.

The invention also aims to provide a separation treatment process which has the characteristics of low separation cost and good separation effect.

The invention provides a technical scheme that:

in a first aspect, an embodiment of the present invention provides a separation processing apparatus, which is used for separating oil stain, clean water and silt from oil-containing silt and drilling wastewater, the separation processing apparatus includes a silt separation assembly and an oil-water separation assembly, the silt separation assembly includes a prewashing stirring mechanism and a solid-liquid separation mechanism which are connected in sequence, and the oil-water separation assembly is connected with a liquid phase outlet of the solid-liquid separation mechanism; the prewashing and stirring mechanism is used for heating and stirring the oily sediment and the drilling wastewater simultaneously to form a first mixed solution; the solid-liquid separation mechanism is used for separating silt from the first mixed solution and forming a second mixed solution; the oil-water separation component is used for separating the clean water and the oil stains from the second mixed liquid.

With reference to the first aspect, in a first implementation manner of the first aspect, the separation processing apparatus further includes a heating assembly, the heating assembly includes a heater, a hot water container, and a hot water pump, and a first heat exchanger is disposed in the prewashing and stirring mechanism; the hot water container is used for containing water, the heater is arranged in the hot water container and used for heating water, and the hot water pump is connected with the hot water container and connected with the inlet of the first heat exchanger so as to convey hot water to the first heat exchanger and be used for heating a medium in the prewashing and stirring mechanism.

With reference to the first aspect and the foregoing implementation manner, in a second implementation manner of the first aspect, the silt separation assembly further includes a first chemical adding mechanism, and the first chemical adding mechanism is connected with the prewashing stirring mechanism and is configured to add a dispersant into the prewashing stirring mechanism.

With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, the silt separating assembly further includes a second chemical adding mechanism and a first pipeline mixer, and the solid-liquid separating mechanism is connected to the prewashing stirring mechanism through the first pipeline mixer; and the second dosing mechanism is connected with the first pipeline mixer and is used for adding a demulsifier into the first pipeline mixer.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the oil-water separation assembly includes a first sedimentation tank, a second sedimentation tank, and an oil slick container; the first sedimentation tank and the second sedimentation tank are sequentially connected, and an inlet of the first sedimentation tank is connected with a liquid phase outlet of the solid-liquid separation mechanism; the floating oil container is respectively connected with the top of the first sedimentation tank and the top of the second sedimentation tank and is used for collecting oil stains in the first sedimentation tank and the second sedimentation tank.

With reference to the first aspect and the foregoing implementation manner, in a fifth implementation manner of the first aspect, the first sedimentation tank is a vertical sedimentation tank, and the second sedimentation tank is an inclined tube sedimentation tank.

With reference to the first aspect and the foregoing implementation manner, in a sixth implementation manner of the first aspect, the oil-water separation assembly further includes an air flotation mechanism, and an inlet of the air flotation mechanism is connected to a water outlet of the second sedimentation tank; the floating oil container is further connected with an oil outlet at the top of the air floating mechanism, an oil scraping mechanism is arranged at the top of the air floating mechanism, and the oil scraping mechanism can scrape oil stains in the air floating mechanism to the oil outlet so that the floating oil container can collect the oil stains in the air floating mechanism.

With reference to the first aspect and the foregoing implementation manner, in a seventh implementation manner of the first aspect, the oil-water separation assembly further includes a filtering mechanism, and the filtering mechanism is connected to a water outlet of the air floating mechanism and is configured to filter sewage discharged by the air floating mechanism to form the clean water.

With reference to the first aspect and the foregoing implementation manner, in an eighth implementation manner of the first aspect, the separation processing apparatus further includes a dewatering assembly, where the dewatering assembly includes a dewatering mechanism, and the dewatering mechanism is respectively connected to a solid phase outlet of the solid-liquid separation mechanism, the bottom of the first sedimentation tank, and the bottom of the second sedimentation tank, and is connected to a material inlet of the solid-liquid separation mechanism; dewatering mechanism can be right solid-phase outlet discharge's of solid-liquid separation mechanism silt mud that the bottom of first sedimentation tank is depositd and the mud that the bottom of second sedimentation tank is depositd carries out dehydration to discharge silt and sewage, and can to solid-liquid separation mechanism's pan feeding mouth carries sewage.

With reference to the first aspect and the foregoing implementation manner, in a ninth implementation manner of the first aspect, the dehydration assembly further includes a second pipeline mixer and a third dosing mechanism, and the dehydration mechanism is connected to the solid phase outlet of the solid-liquid separation mechanism, the bottom of the first sedimentation tank, and the bottom of the second sedimentation tank through the second pipeline mixer; and the third dosing mechanism is connected with the second pipeline mixer and is used for adding a flocculating agent to the second pipeline mixer.

In a second aspect, an embodiment of the present invention further provides a separation treatment process for separating oil, clean water, and silt from oil-containing silt and drilling wastewater, where the separation treatment process includes: simultaneously heating and stirring the oily sediment and the drilling wastewater to form a first mixed solution; separating silt from the first mixed solution to form a second mixed solution; separating the clean water and the oil stain from the second mixed solution.

Compared with the prior art, the separation processing device provided by the embodiment of the invention has the beneficial effects that compared with the prior art, the separation processing device provided by the embodiment of the invention comprises the following components:

the prewashing and stirring mechanism simultaneously heats and stirs the oil-containing silt and the drilling wastewater to form a first mixed solution, so as to stir and scrub the oil-containing silt, so that the silt and the oil stain are collided and rubbed and dispersed mutually to separate the silt and the oil stain, and the water consumption is reduced by mixing the prewashing and stirring mechanism with the drilling wastewater to stir and scrub; and the oil-containing silt and the drilling and production wastewater are heated while stirring and scrubbing are carried out, so that the separation degree and efficiency of the silt and the oil dirt are improved. And the solid-liquid separation mechanism is used for separating silt and oil stain from the first mixed liquid so as to realize the separation of the silt, and a second mixed liquid is also formed and is discharged through a liquid phase outlet of the solid-liquid separation mechanism. And the oil-water separation component is connected with a liquid phase outlet of the solid-liquid separation mechanism and is used for receiving the second mixed liquid and separating clear water and oil stains from the second mixed liquid so as to realize the separation of the clear water and the oil stains. In this way, the oily silt and the drilling wastewater are heated and stirred simultaneously through prewashing and stirring to promote the separation of silt and oil dirt and improve the separation effect of silt and oil dirt, then the silt in the first mixed liquid is separated through the solid-liquid separation mechanism, the drilling wastewater is mixed in the stirring and scrubbing process to reduce the water consumption and improve the separation effect, and the silt in the oily silt is separated and simultaneously the silt in the drilling wastewater is separated; in addition, the drilling and production wastewater and the oily sediment are separated simultaneously, so that the separation cost is reduced, and the separation efficiency is improved.

The beneficial effects of the separation treatment process provided by the embodiment of the invention compared with the prior art are the same as the beneficial effects of the separation treatment device compared with the prior art, and are not described again.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

Fig. 1 is a schematic structural diagram of a separation processing apparatus according to a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a silt separation module of a separation treatment apparatus according to a first embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a heating assembly of a separation processing apparatus according to a first embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an oil-water separation assembly of the separation processing apparatus according to the first embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a dewatering unit of a separation processing apparatus according to a first embodiment of the present invention.

Fig. 6 is a schematic flow chart of a separation treatment process according to a second embodiment of the present invention.

Icon: 10-a separation treatment device; 11-a silt separation module; 111-a screw conveyor; 112-prewashing stirring mechanism; 113 — a first heat exchanger; 114-a first dosing mechanism; 115-a second dosing mechanism; 116-a first line mixer; 117-solid-liquid separation mechanism; 118-a second heat exchanger; 13-an oil-water separation component; 131-a first sedimentation tank; 132-a second settling tank; 133-oil slick container; 134-vacuum pump; 135-oil drain pump; 136-an air floating mechanism; 137-oil outlet; 138-a scraping mechanism; 139-a filter mechanism; 15-a heating assembly; 151-a heater; 152-a hot water reservoir; 153-hot water pump; 17-a dewatering assembly; 171-a second pipeline mixer; 172-third dosing mechanism; 173-dewatering mechanism.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. The terms "upper", "lower", "inner", "outer", "left", "right", and the like, refer to an orientation or positional relationship as shown in the drawings, or as would be conventionally found in use of the inventive product, or as would be conventionally understood by one skilled in the art, and are used merely to facilitate the description and simplify the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the present invention. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It is also to be understood that, unless expressly stated or limited otherwise, the terms "disposed," "connected," and the like are intended to be open-ended, and mean "connected," i.e., fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following detailed description of embodiments of the invention refers to the accompanying drawings.

The first embodiment:

referring to fig. 1, fig. 1 is a schematic structural diagram of a separation processing apparatus 10 according to a first embodiment of the present invention.

The first embodiment of the present invention provides a separation treatment apparatus 10, and the separation treatment apparatus 10 is used for separating oil, clean water and silt from oil-containing silt and fracturing drilling wastewater, and has the characteristics of low separation cost and good separation effect. The separation treatment apparatus 10 can be applied to a fracturing drilling system or the like, and of course, the separation treatment apparatus 10 can be used independently.

The following will specifically describe the structural composition, the operation principle and the advantageous effects of the separation processing apparatus 10 according to the first embodiment of the present invention.

Referring to fig. 1 and 2, fig. 2 is a schematic structural diagram of a silt separation module 11 of a separation processing apparatus 10 according to a first embodiment of the present invention.

This separation processing apparatus 10 includes silt separation module 11 and oil-water separation module 13 to separate out silt through silt separation module 11, clear water and greasy dirt are separated out to rethread oil-water separation module 13.

The silt separation component 11 comprises a prewashing and stirring mechanism 112 and a solid-liquid separation mechanism 117 which are sequentially connected, wherein the prewashing and stirring mechanism 112 is used for simultaneously heating and stirring oil-containing silt and drilling wastewater to form a first mixed solution, so that the oil-containing silt is stirred and scrubbed, the silt and oil contamination of the oil-containing silt are mutually collided and rubbed and dispersed to separate the silt and oil contamination, and the water consumption is reduced by mixing the drilling wastewater into the mixture to stir and scrub; and the oil-containing silt and the drilling and production wastewater are heated while stirring and scrubbing are carried out, so that the separation degree and efficiency of the silt and the oil dirt are improved. The solid-liquid separation mechanism 117 is used for separating silt and oil dirt from the first mixed liquid to realize the separation of silt, that is, the silt in the drilling and production wastewater is separated at the same time, and a second mixed liquid is formed and is discharged through a liquid phase outlet of the solid-liquid separation mechanism 117.

The oil-water separation component 13 is connected to a liquid phase outlet of the solid-liquid separation mechanism 117, and the oil-water separation component 13 is configured to receive the second mixed liquid and separate clean water and oil stain from the second mixed liquid, so as to separate clean water from oil stain.

In this way, the oily silt and the drilling wastewater are heated and stirred simultaneously through prewashing and stirring to promote the separation of silt and oil dirt and improve the separation effect of silt and oil dirt, then the silt in the first mixed liquid is separated through the solid-liquid separation mechanism 117, the drilling wastewater is mixed in the stirring and scrubbing process to reduce the water consumption and improve the separation effect, and the silt in the oily silt is separated and simultaneously the silt in the drilling wastewater is separated; in addition, the drilling and production wastewater and the oily sediment are separated simultaneously, so that the separation cost is reduced, and the separation efficiency is improved.

In this embodiment, the solid-liquid separation mechanism 117 is a horizontal solid-liquid separation mechanism 117 that separates silt and other liquids by wind power using density difference between solid and liquid phases, and extrudes silt at a solid phase outlet at one end, and oil and water of the liquids overflow from a liquid phase outlet at the other end to the oil-water separation assembly 13, and the solid-liquid separation mechanism 117 can further stir the first mixed liquid to further separate silt and oil in the first mixed liquid, thereby improving the effect of separating silt and oil. In other embodiments, the solid-liquid separation mechanism 117 may be a solid-liquid separation device of another form, and this embodiment is not limited thereto.

Referring to fig. 1, fig. 2 and fig. 3, fig. 3 is a schematic structural diagram of a heating element 15 of a separation processing apparatus 10 according to a first embodiment of the present invention.

The separation processing device 10 may further include a heating assembly 15, the heating assembly 15 includes a heater 151, a hot water container 152 and a hot water pump 153, and the first heat exchanger 113 is disposed in the prewash stirring mechanism 112, wherein the hot water container 152 is used for containing water, the heater 151 is disposed in the hot water container 152 and is used for heating water, and the hot water pump 153 is connected to the hot water container 152 and is connected to an inlet of the first heat exchanger 113, so as to deliver hot water to the first heat exchanger 113 through the hot water pump 153, and heat the medium in the prewash stirring mechanism 112 through the first heat exchanger 113.

It should be noted that a second heat exchanger 118 may be further disposed in the solid-liquid separation mechanism 117, and the hot water pump 153 is further connected to an inlet of the second heat exchanger 118 and the prewashing stirring mechanism 112, so as to deliver hot water to the second heat exchanger 118 and the prewashing stirring mechanism 112, so as to heat the medium in the solid-liquid separation mechanism 117 through the second heat exchanger 118, so as to increase the temperature of the second mixed liquid, so as to facilitate the oil-water separation assembly 13 to separate oil contamination and clean water, and further improve the effect of separating oil contamination and silt, and further introduce hot water into the prewashing stirring mechanism 112, so as to further improve the effect of separating oil contamination and silt.

Further, the silt separation assembly 11 may further include a first chemical adding mechanism 114, where the first chemical adding mechanism 114 is connected to the prewashing stirring mechanism 112 and is used for adding a dispersant into the prewashing stirring mechanism 112 to disperse solid and liquid particles that are difficult to dissolve in the liquid by the dispersant, so as to improve the separation effect of the oil and the silt.

It should be noted that the first chemical adding mechanism 114 is further connected to the hot water pump 153 to receive the hot water delivered by the hot water pump 153, so as to add the dispersant, and improve the effect of the dispersant.

Further, the silt separation assembly 11 may further include a second chemical feeding mechanism 115 and a first pipeline mixer 116, and the solid-liquid separation mechanism 117 is connected to the prewashing stirring mechanism 112 through the first pipeline mixer 116, that is, the media in the prewashing stirring mechanism 112 are uniformly mixed by the pipeline of the first pipeline mixer 116 and then enter the solid-liquid separation mechanism 117. And the second dosing mechanism 115 is connected to the first line mixer 116 and is used to add a demulsifier into the first line mixer 116. So as to remove the water in the crude oil and heavy oil and improve the separation effect of oil stain and water and the layering effect of oil stain, water and silt.

It should be noted that the second dosing mechanism 115 is further connected to the hot water pump 153 to receive the hot water delivered by the hot water pump 153, so as to add the demulsifier, thereby improving the effect of the demulsifier.

Referring to fig. 1-4, fig. 4 is a schematic structural diagram of an oil-water separation assembly 13 of a separation processing apparatus 10 according to a first embodiment of the present invention.

The oil-water separation component 13 may include a first sedimentation tank 131, a second sedimentation tank 132 and an oil slick container 133, the first sedimentation tank 131 and the second sedimentation tank 132 are connected in sequence, wherein an inlet of the first sedimentation tank 131 is connected with a liquid phase outlet of the solid-liquid separation mechanism 117; the floating oil container 133 is connected to the top of the first settling tank 131 and the top of the second settling tank 132, respectively, and is used for collecting oil contamination in the first settling tank 131 and the second settling tank 132. To separate the suspended oil contamination in the second mixed solution into the floating oil container 133, and to settle the particles such as silt in the second mixed solution to the bottom.

It should be noted that, in this embodiment, the first sedimentation tank 131 is a vertical sedimentation tank, and the second sedimentation tank 132 is a sloped tube sedimentation tank. So as to carry out three-phase separation on the second mixed liquid.

Further, the oil-water separation assembly 13 may further include an air floating mechanism 136, an inlet of the air floating mechanism 136 is connected to a water outlet of the second sedimentation tank 132, the oil floating container 133 is further connected to an oil outlet 137 at the top of the air floating mechanism 136, an oil scraping mechanism 138 may be further disposed at the top of the air floating mechanism 136, and the oil scraping mechanism 138 may scrape oil contamination in the air floating mechanism 136 to the oil outlet 137, so that the oil floating container 133 receives the oil contamination in the air floating mechanism 136. In other words, the air floating mechanism 136 introduces the micro bubbles into the second mixed liquid, so that the micro bubbles are adhered to the particles suspended in the water to form a water-gas-particle three-phase mixed system, so that the bubbles float to the water surface on the particles, and the oil stain that cannot be separated during the sedimentation process floats to the water surface, and the oil scraping mechanism 138 scrapes the oil stain in the air floating mechanism 136 to the oil outlet 137, so that the oil stain container 133 receives the oil stain in the air floating mechanism 136. So as to further separate the oil stains in the second mixed liquid.

Further, the oil-water separation assembly 13 further comprises a filtering mechanism 139, and the filtering mechanism 139 is connected to the water outlet of the air floating mechanism 136 and is used for filtering the sewage discharged by the air floating mechanism 136 to form clean water.

In the embodiment, the filtering mechanism 139 is a walnut shell filter and a multi-media filter which are sequentially arranged, and the water outlet of the filtering mechanism 139 can be further connected with the hot water container 152 to supply water to the hot water container 152 so as to recycle the water, thereby further reducing the water consumption. The sewage discharged from the air flotation mechanism 136 may be discharged to the solid-liquid separation mechanism 117, so that the sewage discharged from the air flotation mechanism 136 may be treated several times in the case of a large amount of oil and impurities.

Referring to fig. 1-5, fig. 5 is a schematic structural diagram of a dewatering element 17 of a separation processing apparatus 10 according to a first embodiment of the present invention.

The separation processing device 10 further comprises a dewatering component 17, the dewatering component 17 comprises a dewatering mechanism 173, the dewatering mechanism 173 is respectively connected with the solid phase outlet of the solid-liquid separation mechanism 117, the bottom of the first sedimentation tank 131 and the bottom of the second sedimentation tank 132, and the dewatering mechanism 173 is further connected with the feeding port of the solid-liquid separation mechanism 117. The dewatering mechanism 173 can dewater silt discharged from the solid phase outlet of the solid-liquid separation mechanism 117, sludge settled at the bottom of the first sedimentation tank 131, and sludge settled at the bottom of the second sedimentation tank 132 to discharge silt and sewage, and the dewatering mechanism 173 can convey sewage to the feed inlet of the solid-liquid separation mechanism 117 to separate sewage again.

It should be noted that the dewatering mechanism 173 is also connected to the hot water pump 153 to receive the hot water delivered by the hot water pump 153, so as to wash the filter screen of the dewatering mechanism 173 and further separate the silt and the residual oil in the sludge. In addition, the silt separated by the dewatering mechanism 173 can be transported to a brick making plant, and after high-temperature pyrolysis (drying treatment) is carried out, harmful substances in the silt are thoroughly removed, so that the silt can be used as a brick making auxiliary material or a roadbed cushion material, the purposes of changing waste into valuable, saving energy and reducing emission are achieved, and the potential safety hazard and environmental protection are thoroughly eliminated.

Further, the dewatering assembly 17 may further include a second pipeline mixer 171 and a third dosing mechanism 172, and the dewatering mechanism 173 is connected to the solid phase outlet of the solid-liquid separation mechanism 117, the bottom of the first sedimentation tank 131 and the bottom of the second sedimentation tank 132 through the second pipeline mixer 171, so as to uniformly mix the silt and sludge conveyed thereto through the second pipeline mixer 171. And third medicine mechanism 172 is connected with second pipeline mixer 171 to be used for adding the flocculating agent to second pipeline mixer 171, in order to concentrate the granule in silt and the mud, so that dewatering mechanism 173 carries out dehydration to silt and mud, improves the dehydration effect.

Referring to fig. 1-5, the specific process of the separation processing apparatus 10 is as follows:

the drilling wastewater is introduced into a prewashing and stirring mechanism 112, and the oily sediment is conveyed to the prewashing and stirring mechanism 112 through a screw conveyor 111; the prewashing stirring mechanism 112 is used for stirring oil-containing silt and drilling wastewater, a medium in the prewashing stirring mechanism 112 is heated through the first heat exchanger 113, the first chemical adding mechanism 114 can be used for adding a dispersing agent into the prewashing stirring mechanism 112, and the hot water pump 153 can also be used for conveying hot water to the prewashing stirring mechanism 112;

the medium heated and stirred by the prewashing stirring mechanism 112 passes through the first pipeline mixer 116 and is then conveyed to the solid-liquid separation mechanism 117, wherein the second dosing mechanism 115 adds a demulsifier into the first pipeline mixer 116.

The solid-liquid separation mechanism 117 further stirs the first mixed liquid, and heats the medium in the solid-liquid separation mechanism 117 through the second heat exchanger 118, the solid-liquid separation mechanism 117 separates silt from the first mixed liquid, and forms a second mixed liquid, and the second mixed liquid overflows to the oil-water separation assembly 13;

the hot water pump 153 may also be connected to the first chemical adding mechanism 114, the second chemical adding mechanism 115, and the third chemical adding mechanism 172 to provide hot water thereto, so as to facilitate the mixing of the dispersant, the demulsifier, and the flocculant, thereby improving the effect of the corresponding chemical.

The second mixed liquid is subjected to three-phase separation by a first sedimentation tank 131 and a second sedimentation tank 132 of the oil-water separation component 13, wherein sludge precipitated at the bottom and oil stains at the top enter an oil slick container 133, and water in the middle enters an air floatation mechanism 136;

the silt separated by the solid-liquid separation mechanism 117, the sludge settled at the bottom of the first sedimentation tank 131, and the sludge settled at the bottom of the second sedimentation tank 132 may be further conveyed to the dehydration mechanism 173 for dehydration, and the hot water pump 153 may also convey hot water to the dehydration mechanism 173 to wash the filter screen of the dehydration mechanism 173 or further separate the silt and the residual oil in the sludge. The sewage separated by the dewatering mechanism 173 can also be returned to the material inlet of the solid-liquid separation mechanism 117 for oil-water separation again. In addition, silt and sludge can enter the dewatering mechanism 173 through the second pipeline mixer 171, and the third dosing mechanism 172 can also add a flocculating agent into the second pipeline mixer 171 to improve the effect of separating silt of the dewatering mechanism 173.

After the water in the air floating mechanism 136 is treated by the air floating method, the oil stain which can not be separated in the sedimentation process floats out of the water surface, moves to the oil outlet 137 under the action of the oil scraping mechanism 138 and enters the oil floating container 133; the water passing through the air floating mechanism 136 can also be returned to the material inlet of the solid-liquid separation mechanism 117 for oil-water separation again.

The floating oil container 133 may further include a vacuum pump 134 and an oil discharge pump 135, the vacuum pump 134 may make the floating oil container 133 in a negative pressure state to suck oil stains from the first sedimentation tank 131, the second sedimentation tank 132, and the air flotation mechanism 136, and the oil discharge pump 135 may be connected to the bottom of the floating oil container 133 to discharge oil outward, and may further convey part of water separated from the oil stains after standing to the solid-liquid separation mechanism 117 to perform oil-water separation treatment on the water again. In addition, in order to prevent the oil stain from crystallizing in the pipeline for conveying the oil stain, the corresponding pipeline can be also designed with electric tracing so as to keep the temperature of the oil stain conveying pipeline.

The water passing through the air floating mechanism 136 can be filtered by the filtering mechanism 139 to form clear water, part of the clear water can be transported to a sewage treatment plant for treatment, and part of the clear water can flow back to the hot water container 152 for recycling.

The operation principle of the separation processing apparatus 10 according to the first embodiment of the present invention is as follows:

the prewashing stirring mechanism 112 simultaneously heats and stirs the oil-containing silt and the drilling wastewater to form a first mixed solution, so as to stir and scrub the oil-containing silt, so that the silt and the oil stain are collided and rubbed and dispersed with each other to separate the silt and the oil stain, and the water consumption is reduced by mixing the drilling wastewater into the mixed solution to stir and scrub; and the oil-containing silt and the drilling and production wastewater are heated while stirring and scrubbing are carried out, so that the separation degree and efficiency of the silt and the oil dirt are improved. The solid-liquid separation mechanism 117 is used for separating silt and oil dirt from the first mixed liquid to realize the separation of silt, that is, the silt in the drilling wastewater is separated at the same time, and a second mixed liquid is formed and discharged through a liquid phase outlet of the solid-liquid separation mechanism 117. The oil-water separation component 13 is connected to a liquid phase outlet of the solid-liquid separation mechanism 117, and the oil-water separation component 13 is configured to receive the second mixed liquid and separate clean water and oil stain from the second mixed liquid, so as to separate clean water from oil stain. In this way, the oily silt and the drilling wastewater are heated and stirred simultaneously through prewashing and stirring to promote the separation of silt and oil dirt and improve the separation effect of silt and oil dirt, then the silt in the first mixed liquid is separated through the solid-liquid separation mechanism 117, the drilling wastewater is mixed in the stirring and scrubbing process to reduce the water consumption and improve the separation effect, and the silt in the oily silt is separated and simultaneously the silt in the drilling wastewater is separated; in addition, the drilling and production wastewater and the oily sediment are separated simultaneously, so that the separation cost is reduced, and the separation efficiency is improved.

In summary, the following steps:

the first embodiment of the present invention provides a separation processing apparatus 10, which has the characteristics of low separation cost and good separation effect.

Second embodiment:

referring to fig. 6, fig. 6 is a schematic flow chart of a separation process according to a second embodiment of the invention.

The embodiment provides a separation treatment process for oil-containing silt and drilling wastewater, which is used for separating oil stain, clear water and silt from the oil-containing silt and fracturing drilling wastewater. It should be noted that the separation processing process provided in the present embodiment can be applied to the separation processing apparatus 10 of the above embodiment, the basic principle and the generated technical effect are the same as those of the above embodiment, and for the sake of brief description, the corresponding contents in the above embodiment can be referred to for the parts that are not mentioned in the present embodiment.

The separation treatment process comprises the following steps:

step S100: simultaneously heating and stirring the oil-containing silt and the drilling wastewater to form a first mixed solution; this step is performed by the prewash agitation mechanism 112 in the first embodiment, and in addition, the prewash agitation mechanism 112 can heat the medium in the prewash agitation mechanism 112 through the first heat exchanger 113, the first chemical adding mechanism 114 can add the dispersant to the prewash agitation mechanism 112, and the hot water pump 153 can also deliver the hot water to the prewash agitation mechanism 112, so as to improve the effect of separating the oil stain and the silt.

Step S200: separating silt from the first mixed solution to form a second mixed solution; this step is completed by the solid-liquid separation mechanism 117 in the first embodiment, and the solid-liquid separation mechanism 117 may further stir the first mixed liquid, and heat the medium in the solid-liquid separation mechanism 117 by the second heat exchanger 118, thereby further improving the separation effect of the silt and the oil stain.

In addition, the medium heated and stirred by the prewashing and stirring mechanism 112 can also be conveyed to the solid-liquid separation mechanism 117 after passing through the first pipeline mixer 116, and the second dosing mechanism 115 can add the demulsifier into the first pipeline mixer 116. So as to improve the separation effect of the oil stain and the water and the layering effect of the oil stain, the water and the silt.

Step S300: separating clear water and oil stain from the second mixed solution; this step is performed by the oil-water separation assembly 13 in the first embodiment to separate the second mixed liquid into clean water and oil stains.

The second mixed solution can be sequentially subjected to three-phase separation, air floatation treatment and filtration to separate clear water, and floating oil dirt is collected in the three-phase separation and air floatation treatment processes to separate the oil dirt; the process can be completed by a first sedimentation tank 131, a second sedimentation tank 132, an air flotation mechanism 136, a filtering mechanism 139 and an oil slick container 133 in the first embodiment, the second mixed solution is subjected to three-phase separation by the first sedimentation tank 131 and the second sedimentation tank 132 of the oil-water separation assembly 13, wherein sludge settled at the bottom and oil stains at the top enter the oil slick container 133, water at the middle enters the air flotation mechanism 136, and air bubbles are introduced into the second mixed solution by the air flotation mechanism 136, so that the oil stains which cannot be separated in the sedimentation process float out of the water surface, move to an oil outlet 137 under the action of an oil scraping mechanism 138 and enter the oil slick container 133; the floating oil container 133 may further be provided with a vacuum pump 134 and an oil discharge pump 135, the vacuum pump 134 makes the floating oil container 133 in a negative pressure state, so that oil stains are sucked from the first sedimentation tank 131, the second sedimentation tank 132 and the floating mechanism 136, and the sewage passing through the floating mechanism 136 may also return to the feed port of the solid-liquid separation mechanism 117 for oil-water separation again. The drain pump 135 is connected to the bottom of the floating oil container 133, and can drain oil to the outside and also can convey part of the sewage separated from the oil stain after standing to the solid-liquid separation mechanism 117 to perform the oil-water separation treatment again on the sewage. The water passing through the air floating mechanism 136 can be filtered by the filtering mechanism 139 to form clear water, a part of the clear water can be transported to a sewage treatment plant for treatment, and a part of the clear water can be heated into hot water to flow back to the position of the pre-washing stirring mechanism 112 and the like, so as to realize recycling.

The silt separated by the solid-liquid separation mechanism 117, the sludge settled at the bottom of the first sedimentation tank 131, and the sludge settled at the bottom of the second sedimentation tank 132 may be further conveyed to the dewatering mechanism 173 for dewatering, and the hot water pump 153 may also convey hot water to the dewatering mechanism 173 to wash the filter screen of the dewatering mechanism 173 or further separate the silt and the residual oil in the sludge. The sewage separated by the dewatering mechanism 173 can also be returned to the feed inlet of the solid-liquid separation mechanism 117 for oil-water separation again. In addition, silt and sludge can enter the dewatering mechanism 173 through the second pipeline mixer 171, and the third dosing mechanism 172 can also add a flocculating agent into the second pipeline mixer 171 to improve the effect of separating silt of the dewatering mechanism 173.

The second embodiment of the present invention provides a separation processing apparatus 10 having the following operation principle:

the oil-containing silt and the drilling and production wastewater are heated and stirred simultaneously to promote the separation of silt and oil dirt and improve the separation effect of silt and oil dirt, and then the silt in the first mixed liquid is separated; and then the second mixed liquid is subjected to oil-water separation to separate clear water and oil stains, and the drilling and production wastewater and oil-containing silt are simultaneously subjected to separation treatment to reduce the separation cost and improve the separation efficiency.

In summary, the following steps:

the second embodiment of the present invention provides a separation process, which has the characteristics of low separation cost and good separation effect.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that the features in the above embodiments may be combined with each other and the present invention may be variously modified and changed without conflict. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The present embodiments are to be considered as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A separation treatment device is characterized by being used for separating oil stain, clean water and silt from oil-containing silt and drilling wastewater, wherein the separation treatment device (10) comprises a silt separation component (11) and an oil-water separation component (13), the silt separation component (11) comprises a prewashing stirring mechanism (112) and a solid-liquid separation mechanism (117) which are sequentially connected, and the oil-water separation component (13) is connected with a liquid phase outlet of the solid-liquid separation mechanism (117);

the prewashing and stirring mechanism (112) is used for heating and stirring the oily sediment and the drilling wastewater simultaneously to form a first mixed solution;

the solid-liquid separation mechanism (117) is used for separating silt from the first mixed solution and forming a second mixed solution;

the oil-water separation component (13) is used for separating the clean water and the oil stains from the second mixed liquid.

2. The separation processing device according to claim 1, wherein the separation processing device (10) further comprises a heating assembly (15), the heating assembly (15) comprises a heater (151), a hot water container (152) and a hot water pump (153), and a first heat exchanger (113) is arranged in the prewash stirring mechanism (112);

the hot water container (152) is used for containing water, the heater (151) is arranged in the hot water container (152) and is used for heating water, and the hot water pump (153) is connected with the hot water container (152) and is connected with the inlet of the first heat exchanger (113) so as to convey hot water to the first heat exchanger (113) and be used for heating media in the prewashing and stirring mechanism (112).

3. The separation treatment device according to claim 1, wherein the silt separation assembly (11) further comprises a first dosing mechanism (114), and the first dosing mechanism (114) is connected with the prewashing stirring mechanism (112) and is used for adding a dispersing agent into the prewashing stirring mechanism (112).

4. The separation treatment device according to claim 1, wherein the silt separation assembly (11) further comprises a second dosing mechanism (115) and a first pipeline mixer (116), and the solid-liquid separation mechanism (117) is connected with the prewashing stirring mechanism (112) through the first pipeline mixer (116);

the second dosing mechanism (115) is connected with the first pipeline mixer (116) and is used for adding a demulsifier into the first pipeline mixer (116).

5. The separation processing apparatus according to any one of claims 1 to 4, wherein the oil-water separation module (13) includes a first settling tank (131), a second settling tank (132), and an oil slick container (133);

the first sedimentation tank (131) and the second sedimentation tank (132) are sequentially connected, and an inlet of the first sedimentation tank (131) is connected with a liquid phase outlet of the solid-liquid separation mechanism (117); the floating oil container (133) is respectively connected with the top of the first sedimentation tank (131) and the top of the second sedimentation tank (132) and is used for collecting oil stains in the first sedimentation tank (131) and the second sedimentation tank (132).

6. The separation treatment device according to claim 5, characterized in that the oil-water separation assembly (13) further comprises an air flotation mechanism (136), wherein an inlet of the air flotation mechanism (136) is connected with an outlet of the second sedimentation tank (132);

the floating oil container (133) is further connected with an oil outlet (137) at the top of the air floating mechanism (136), an oil scraping mechanism (138) is arranged at the top of the air floating mechanism (136), and the oil scraping mechanism (138) can scrape oil stains in the air floating mechanism (136) to the oil outlet (137) so that the floating oil container (133) can collect the oil stains in the air floating mechanism (136).

7. The separation treatment device according to claim 6, wherein the oil-water separation assembly (13) further comprises a filtering mechanism (139), and the filtering mechanism (139) is connected with the water outlet of the air flotation mechanism (136) and is used for filtering the sewage discharged by the air flotation mechanism (136) to form the clean water.

8. The separation processing apparatus according to claim 5, wherein the separation processing apparatus (10) further comprises a dewatering assembly (17), the dewatering assembly (17) comprises a dewatering mechanism (173), the dewatering mechanism (173) is connected with the solid phase outlet of the solid-liquid separation mechanism (117), the bottom of the first sedimentation tank (131) and the bottom of the second sedimentation tank (132), respectively, and is connected with the feed inlet of the solid-liquid separation mechanism (117);

dewatering mechanism (173) can be right the solid phase outlet discharged silt of solid-liquid separation mechanism (117), the mud of the bottom sediment of first sedimentation tank (131) and the mud of the bottom sediment of second sedimentation tank (132) carry out dehydration to discharge silt and sewage, and can to the pan feeding mouth of solid-liquid separation mechanism (117) carries sewage.

9. The separation treatment device according to claim 8, wherein the dewatering assembly (17) further comprises a second pipeline mixer (171) and a third dosing mechanism (172), and the dewatering mechanism (173) is connected with the solid phase outlet of the solid-liquid separation mechanism (117), the bottom of the first sedimentation tank (131) and the bottom of the second sedimentation tank (132) through the second pipeline mixer (171);

the third dosing mechanism (172) is connected with the second pipeline mixer (171) and is used for adding a flocculating agent to the second pipeline mixer (171).

10. A separation treatment process is used for separating oil stain, clear water and silt from oil-containing silt and drilling wastewater, and is characterized by comprising the following steps:

simultaneously heating and stirring the oily sediment and the drilling wastewater to form a first mixed solution;

separating silt from the first mixed solution to form a second mixed solution;

separating the clean water and the oil stain from the second mixed solution.