CN205398327U - Modularization oil -containing sewage treatment system - Google Patents

Abstract

The utility model relates to a modular oily sewage treatment system, an oily sewage treatment system, comprising a pre-greasing module, a sedimentation module and a filtering module connected sequentially through pipelines, and the oily sewage treatment system also includes connecting the pre-oiling module and the The first connecting pipe of the filtration module and the settling module are arranged in parallel, the first connecting pipe is provided with a first valve, and the pipeline connecting the pre-oil removal module and the settling module is provided with a second valve downstream of the inlet of the first connecting pipe . The utility model can select different treatment devices to treat the oily sewage according to the requirements of the water injection quality, saves unnecessary sewage treatment steps, and improves the efficiency of sewage treatment.

Description

A modular oily sewage treatment system

technical field

The utility model relates to the field of oily sewage treatment, in particular to a modular oily sewage treatment system.

Background technique

At present, most domestic oilfields have entered the late stage of development. In order to achieve more effective reuse of oily sewage and increase production of oilfields, rolling development at the edge of oilfields is required. Oilfield water injection refers to injecting water into oil layers to replenish and maintain oil layer pressure. After treatment Oily sewage can be used to meet the needs of oilfield water injection. The average air permeability of the injection layer is tested in the oil well, and the requirements for different injection water quality are obtained according to the average air permeability of the injection layer, and then the oily sewage is treated according to factors such as oil field production and environment, so that the treated oily sewage can be recycled For formation injection, due to the complex water quality components of oily sewage, it is necessary to strictly control multiple indicators such as suspended solids and oil in the water to prevent it from causing damage to the formation.

In order to realize the recycling of water resources and effectively treat oily sewage, the Chinese patent with publication number CN104326596A discloses an oily sewage treatment system, including sequentially connected sewage inlet, dosing device, coagulation and sedimentation device, filtration and oil-water separation device, in which the dosing coagulation settling device is externally connected to the filter press device, the oily sewage reacts with the water treatment agent added by the dosing device through the sewage inlet, and then placed in the buffer settling tank for clarification, and the bottom impurities pass through the buffer The impurity outlet of the settling tank enters the filter press to be squeezed into blocks, and the sewage enters the filter device to filter the suspended particles, and then the oil and water are separated by the oil-water separation device. impurities, but the oily sewage treatment system only includes one treatment process, and the water quality after treatment is single. Since different injection layers have different injection water quality requirements, some unnecessary treatment modules must be passed through when treating oily sewage, making the sewage treatment process more efficient. Reduced efficiency.

Utility model content

The purpose of the utility model is to provide an oily sewage treatment system comprising at least two sewage treatment devices.

In order to solve the above problems, the technical solution of the oily sewage treatment system of the utility model is: an oily sewage treatment system, including a pre-oil removal module, a settling module and a filter module connected in sequence through pipelines, and the oily sewage treatment system also includes connecting The first connecting pipe of the pre-oil removal module and the filter module is arranged in parallel with the sedimentation module, the first connecting pipe is provided with a first valve, and the pipeline connecting the pre-oil removal module and the sedimentation module is on the downstream of the inlet of the first connecting pipe A second valve is provided.

The filter module includes a multi-layer filter material filter device, a modified fiber ball filter device and a sintered filter device connected in order of flow in the oil circuit, and a second filter device is arranged between the multi-layer filter material filter device and the modified fiber ball filter device Three valves.

A dosing module is arranged on the pipeline connecting the pre-oil removal module and the settling module, and the dosing module is located between the inlet of the first connecting pipe and the second valve.

The oily sewage treatment system also includes a second connecting pipe that connects the pre-oil removal module and the sedimentation module in parallel with the dosing module. A fourth valve is arranged on the second connecting pipe. A fifth valve is provided downstream of the inlet of the second connecting pipe.

A sixth valve is arranged between the modified fiber ball filter device and the sintered filter device.

The pre-oil removal module includes a cyclone pre-oiler provided with a liquid-liquid hydrocyclone pipe, and the settling module includes a horizontal high-efficiency coalescence settling tank.

The horizontal high-efficiency coalescing settling tank includes a sloping plate settling chamber and a free settling chamber, and the bottoms of the sloping plate settling chamber and the free settling chamber are each provided with a mud collecting tank for recovering impurities.

The inclined plate settling chamber is provided with an inclined plate, and the inclined plate is made of glass fiber reinforced plastic.

The beneficial effects of the utility model are: the oily sewage treatment system of the utility model includes a pre-greasing module, a sedimentation module and a filtering module, wherein the pre-greasing module is connected with the sedimentation module and the filtering module through pipelines in sequence, and the pre-greasing module and The communication pipeline of the filter module is provided with a first communication pipe in parallel with the sedimentation module, and a first valve is installed on the first communication pipe, and the pipeline in which the pre-oil removal module communicates with the sedimentation module is downstream of the first communication pipe The second valve is installed, so that when treating oily sewage, the first valve can be disconnected and the second valve can be closed, so that the pre-oil removal module can be connected with the sedimentation module and the filter module through the pipeline sequence to process oily sewage to obtain a water quality Water injection; or close the first valve, disconnect the second valve, and directly connect the pre-oil removal module and the filter module to treat oily sewage to obtain another water quality water injection, so that when the second treatment module combination is selected, it can be obtained. The required water quality saves the processing steps of the sedimentation module and improves the efficiency of sewage treatment.

Description of drawings

Fig. 1 is the schematic structural diagram of the swirl pre-oil removal module of Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 2 is a schematic structural diagram of the horizontal high-efficiency coalescence settlement module of Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 3 is the top view of Fig. 2;

Fig. 4 is a schematic structural diagram of a multi-layer filter material filtration module in Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 5 is a structural schematic diagram of the modified fiber ball filter module of Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 6 is a schematic structural diagram of the sintered filter module of Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 7 is a schematic structural diagram of the dosing module of Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 8 is a schematic structural view of the fifth sewage treatment device of Embodiment 1 of the oily sewage treatment system of the present invention;

FIG. 9 is a simplified diagram of the structure of FIG. 8 .

Fig. 10 is the flow chart of the fifth sewage treatment device of Embodiment 1 of the oily sewage treatment system of the present utility model;

Fig. 11 is a flowchart of the fourth sewage treatment device of Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 12 is a flow chart of the third sewage treatment device of Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 13 is a flow chart of the second sewage treatment device in Embodiment 1 of the oily sewage treatment system of the present invention;

Fig. 14 is a flowchart of the first sewage treatment device in Embodiment 1 of the oily sewage treatment system of the present invention;

In the figure: 1-Cyclone lifting pump 2-Cyclone water inlet 3-Liquid-liquid hydrocyclone tube 4-Oil collection chamber 5-Oil outlet 6-Cyclone water distribution chamber 7-Water outlet chamber 8-Swirl flow Outlet of device 9-water inlet of settlement module 10-water distribution chamber of settlement module 12-coalescence rectification chamber 13-slope plate settlement chamber 14-slope plate 15-settlement chamber 16-oil collection chamber 17-connecting pipe 18-water chamber 19- Electric float level transmitter 20-water outlet of sedimentation module 21-oil outlet 22-mud collection tank 24-lift pump of filter material filter tank 25-water inlet of filter material filter tank 26-screen pipe system of filter material filter tank 28 -Block ring 30-Pebble 32-Fiber ball filter tank lifting pump 34-Transmission device 35-Fiber ball filter tank water inlet 36-Screen cylinder 37-Press plate 38-Modified fiber ball 39-Fiber ball filter tank screen system 40-fiber ball filter tank water outlet 41-sintered filter tank lifting pump 43-liquid outlet 44-liquid collection cavity 46-sintered filter tube 47-sintered filter tank water inlet 48-drainage outlet 49-dosing tank 50-water outlet valve 51-water inlet valve 52-metering pump 100-first valve 110-first connecting pipe 120-second valve 130-third valve 140-fourth valve 150-second connecting pipe 160-fifth valve 170-sixth valve.

111-swirl pre-oil removal module 112-dosing module 113-horizontal high-efficiency coalescence sedimentation module 114-multi-layer filter material filtration module 115-modified fiber ball filter module 116-sintered filter module.

detailed description

Embodiment 1 of an oily sewage treatment system, as shown in Figure 1 is a structural diagram of a swirl pre-greaser, the swirl pre-greaser includes a cyclone lift pump 1, a water distribution chamber 6, an oil collection chamber 4, a water outlet Cavity 7 and liquid-liquid hydrocyclone pipe 3, the oily sewage enters the cyclone pre-greaser through the cyclone lifting pump 1 through the water inlet 2, and the water distribution chamber 6 is used to distribute water to the liquid-liquid hydrocyclone pipe 3 and enter The oily sewage of the cyclone pre-degreaser rotates under the centrifugal force of the centrifugal force field formed in the liquid-liquid hydrocyclone tube 3, and the oil with a lighter specific gravity enters the oil collection chamber 4 through the center of the cyclone tube, and the water with a larger specific gravity is The oil in the oil collecting chamber 4 is discharged through the oil outlet 5, and the water in the water collecting chamber 6 is discharged through the water outlet 8 at the same time. The residence time of the liquid in the cyclone separator is extremely short, which can remove oil efficiently and has a good energy-saving effect.

As shown in Figure 2 and Figure 3, the embodiment of the oily sewage treatment system is a schematic diagram of the structure of the horizontal high-efficiency coalescence sedimentation module. The horizontal high-efficiency coalescence sedimentation module is designed according to the principle of shallow sedimentation and is used to separate the particle size in the sewage larger than 50 μm. Oil droplets and impurities with a particle size greater than 15 μm, including water distribution chamber 10, coalescing rectification chamber 12, inclined plate settling chamber 13, free sedimentation chamber 15, and water chamber 18. Oily sewage enters the water distribution chamber 10 through the water inlet 9 of the settlement module. After the water distribution through the water distribution chamber 10, it enters the coalescing and rectifying chamber 12, and the coalescing and rectifying chamber 12 is filled with pebble fillers with a diameter of 20mm~25mm for coarse-graining impurities, and the oily sewage after passing through the coalescing and rectifying chamber 12 enters the installation The sloping plate settling chamber 13 with small spacing sloping plates is used for settling. The sloping plate settling chamber 13 is equipped with a sloping plate 14 made of glass fiber reinforced plastic, and then the sewage is further settled through the cavity structure of the free settling chamber 15. The free settling chamber 15 It is used to ensure the water quality of the water entering the water chamber 18 after sedimentation, and an oil collection chamber 16 for collecting the oil that floats up is arranged between the free sedimentation chamber 15 and the water chamber 18, and at the bottom of the oil collection chamber 16 An oil discharge port 21 for discharging the oil in the oil collection chamber is provided, and a conical mud collection groove 22 is respectively provided at the bottom of the slant plate settling chamber 13 and the free settling chamber 15 to collect the impurities settled in the two chambers, and An outlet for discharging impurities is provided at the bottom of the conical mud collecting tank 22; the treated water in the free settling chamber 15 enters the water chamber 18 through the connecting pipe 17, and an electric floating ball for controlling the liquid level in the water chamber 18 is arranged in the water chamber 18 The liquid level transmitter 19, and then the water in the water chamber 18 is discharged through the water outlet 20 of the settling module. The sewage settling tank can efficiently treat oily sewage without secondary mixing and overcomes the secondary pollution caused by the remixing of sewage in the conventional coagulation or separation process of inclined plate settling tanks.

As shown in Figure 4, it is a structural diagram of the multi-layer filter material filter tank of the first embodiment of the oily sewage treatment system. The multi-layer filter material filter tank adopts a vertical installation method, including high-frequency welding stainless steel filter tubes, and the pore size of the filter tubes is 0.2mm ~ 0.3mm, the sewage to be treated is lifted by the lift pump 24 and enters the multi-layer filter material filter tank through the water inlet 25, and then evenly distributes water through the screen system 26 and then enters the filter material layer, wherein the filter material layer is filled with walnut shells , magnetite, pebble 30, and other filter materials, and a choke ring 28 is provided on the tank wall to prevent the water flow from forming a short flow along the tank wall, and a filter material filter tank for the filtered clear water to discharge is provided at the bottom of the filter tank Outlet. When the multi-layer filter material filter tank needs to be reused, water or air is input from the water outlet of the filter material filter tank and the filter tube is reversed for backwashing, and then the impurities are discharged through the water inlet 25 of the filter material filter tank.

As shown in Figure 5, it is a structural diagram of the modified fiber ball filter tank of Embodiment 1 of the oily sewage treatment system. The modified fiber ball filter tank adopts a vertical installation mode, and the clear water to be filtered is lifted by the fiber ball filter tank lifting pump 32. Enter the screen cylinder 36 through the water inlet 35 of the fiber ball filter tank, and evenly enter the space of the modified fiber ball 38 through the screen hole of the pressure plate 37 after the screen cylinder 36 distributes water, and use the modified fiber ball 38 to filter, and then the transmission device 34 Drive the pressure plate 37 to compress the modified fiber ball 38 so that the filtered clear water is discharged through the water outlet 40 of the fiber ball filter tank. When the modified fiber ball filter tank needs to be backwashed and regenerated, water or air enters the screen pipe system 39 through the water outlet 40 of the fiber ball filter tank to distribute water evenly, and then enters the space of the modified fiber ball 38 and the screen cylinder 36 in turn, and finally impurities It is discharged through the water inlet 35 of the fiber ball filter tank. In the modified fiber ball filter tank, the modified fiber ball is flexible, the pores are variable, and the diameter of the modified fiber filament is small, the specific surface area is large, and the pores of the filter layer are gradually reduced along the direction of water flow, which forms an ideal filter. The upper and lower pores are distributed, and the interception ability gradually becomes stronger from top to bottom, which is beneficial to the removal of oil and suspended solids; the filter material removes oil and mechanical impurities in water by mechanisms such as direct interception, inertial interception and surface adsorption. The oil content of the water filtered by the modified fiber ball filter tank can be reduced from below 20mg/L to below 6mg/L, and the content of suspended matter can be reduced from below 20mg/L to below 2mg/L.

As shown in Figure 6, it is the structural diagram of the sintered filter tank of the first embodiment of the oily sewage treatment system. The sintered filter tank is installed vertically, and the clean water to be filtered enters the sintered filter tank through the sintered filter tank lifting pump 41 through the sintered filter tank water inlet 47. The space of the filter tube 46, and then the water penetrates into the inner wall through the micro-pores of the outer wall of the sintered filter tube 46, while most of the suspended solids and oil droplets are intercepted and sintered on the outer wall of the filter tube to form a filter cake, and the clear water entering the sintered filter tube 46 along the The tube core can enter the liquid collection chamber 44 upwards, and then be discharged through the liquid outlet 43 at the top of the liquid collection chamber 44 . The sintered filter tank has high filtration accuracy and can be regenerated and reused through backwashing.

As shown in Figure 7, it is a structural diagram of the dosing tank module of Embodiment 1 of the oily sewage treatment system, including a dosing tank 49, a metering pump 52, a water inlet valve 51 and a water outlet valve 50, and the sewage that needs to be added with medicine passes through the water inlet valve 51 is mixed with the medicament in the dosing tank 49, and then is output through the water outlet valve 50 by the lifting of the metering pump 52. When it is necessary to add chemicals to mix sewage and chemicals, the oily sewage treatment system is equipped with a static mixer for mixing sewage and chemicals, and the sewage and chemicals can be fully mixed through the mixing of the static mixer.

When using each module for oily sewage treatment, as shown in the connection diagram in Figure 9, the cyclone pre-greaser is connected to the dosing tank module, horizontal high-efficiency coalescence and sedimentation module, multi-layer filter material filtration module, modified fiber A ball filter module and a sintered filter module, and a fifth valve 160 is set between the cyclone pre-oil removal module and the dosing tank module, a second valve 120 is set between the dosing tank module and the horizontal high-efficiency coalescing and settling module, The third valve 130 is set between the multi-layer filter material filter module and the modified fiber ball filter module, and the sixth valve 170 is set between the modified fiber ball filter module and the sintered filter module. The second communication pipe 150 directly connected and the fourth valve 140 used to control the on-off of the second communication pipe are arranged between the high-efficiency coalescence and sedimentation modules, and the cyclone pre-degreaser and the multi-layer filter material filtration module are arranged at the same time The directly connected first connecting pipe 110 and the first valve 100 used to control the opening and closing of the first connecting pipe, through the opening and closing of the valve, the index requirements for different injection water quality of the oil layer can be proposed according to the air permeability of the injection layer, so it is suitable for different The air permeability of the injection layer, each module of the oily sewage treatment system can form five different sewage treatment devices.

When the air permeability of the injection layer of the oil layer is less than or equal to 0.01μm ² , the first valve and the fourth valve are closed, and the other valves are opened, and the cyclone pre-degreaser is sequentially connected to the dosing tank module, horizontal high-efficiency coalescing and settlement module, multi-layer The filter material filter module, the modified fiber ball filter module and the sintered filter module form the fifth oily sewage treatment device, as shown in Figure 10, and Figure 8 is the structural connection diagram of the fifth oily sewage treatment device, the lifting pump of the oily sewage cyclone 1 After lifting, it enters the cyclone pre-degreasing module for degreasing, and the sewage after degreasing by the cyclone pre-degreasing module is fully mixed and flocculated by the flocculant, water purifier, etc. added by the dosing module through the static mixer, and then input The horizontal high-efficiency coalescence sedimentation module settles, and the settled sewage enters the multi-layer filter material filter module and the modified fiber ball filter module respectively, and finally filters through the sintered filter module, and discharges the purified sewage from the liquid outlet on the top of the sintered filter tank , to meet the water quality control index required when the air permeability of the injection layer is less than or equal to 0.01μm ² .

When the air permeability of the injection layer of the oil layer is between (0.01~0.05) ^μm2 , the first valve, the fourth valve and the sixth valve are closed, and the other valves are opened, and the swirl pre-oiler is connected to the dosing tank module, horizontal A high-efficiency coalescence sedimentation module, a multi-layer filter material filter module and a modified fiber ball filter module form the fourth oily sewage treatment device, as shown in Figure 11. After the lifting pump 1 is lifted, it enters the swirl pre-degreasing module for degreasing, and the sewage after degreasing by the swirling pre-greasing module is fully mixed and flocculated by the flocculant, water purifier, etc. added by the dosing module through the static mixer Finally, it is input into the horizontal high-efficiency coalescence sedimentation module for sedimentation, and then the settled sewage enters the multi-layer filter material filter module and the modified fiber ball filter module for filtration, and finally the treated clean water comes from the outlet of the modified fiber ball filter tank 40, the treated sewage can be used to meet the injection water quality requirements of the injection layer with an air permeability between 0.01μm ² and 0.05μm ² , which saves the process of sintering the filter module and makes the oily sewage treatment system according to different injection water quality Process selection is required, saving operation steps.

When the air permeability of the injection layer of the oil layer is between (0.05-0.5) ^μm2 , the first valve, the fourth valve, the third valve and the sixth valve are all closed, and the other valves are opened, and the swirl pre-oiler is sequentially connected to add The medicine tank module, the horizontal high-efficiency coalescing and sedimentation module and the multi-layer filter material filtration module form the third oily sewage treatment device. The treatment process module shown in Figure 12 is used for sewage treatment, and the oily sewage cyclone lifter pump 1 is lifted and enters The swirl pre-greasing module is used for degreasing, and the sewage after degreasing by the swirling pre-greasing module is fully mixed and flocculated by the flocculant and water purifying agent added by the dosing module, and then input into the horizontal high-efficiency aggregate Combined with the settlement module for settlement, the settled sewage enters the multi-layer filter material filter module for filtration, and finally the treated sewage is discharged from the outlet of the multi-layer filter material filter tank. The treated sewage can be used to meet the requirements of the injection layer. Water injection quality requirements with a permeability between 0.05 μm ² and 0.5 μm ² save the operation of the modified fiber ball filter module and the sintered filter module.

When the air permeability of the injection layer of the oil layer is at (0.5-1.5) ^μm2 , the first valve, the third valve, the fifth valve and the sixth valve are all closed, and the other valves are opened, and the swirl pre-oiler is sequentially connected to the horizontal high-efficiency The coalescence sedimentation module and the multi-layer filter material filtration module form the second oily sewage treatment device. The process module shown in Figure 13 is used for sewage treatment. After the oily sewage cyclone lift pump 1 is lifted, it enters the cyclone pre-oil removal module. Degreasing, the sewage after degreasing is lifted by the sedimentation lift pump and then enters the horizontal high-efficiency coalescence sedimentation module from the water inlet of the sedimentation module for sedimentation, and the oily sewage after sedimentation enters the multi-layer filter material filter module for filtration and final treatment The treated sewage is discharged from the water outlet of the multi-layer filter material filter tank, and the treated sewage can be used to meet the injection water quality requirements of the air permeability of the injection layer between 0.5μm ² and 1.5μm ² .

When the air permeability of the injection layer of the oil layer is greater than or equal to 1.5 μm ² , the second, third, fourth, fifth, and sixth valves are all closed, and the other valves are opened, and the swirl pre-greaser is connected to the multi-layer filter material filter module to form the first oily sewage The treatment device adopts the process module shown in Figure 14 for sewage treatment. For the water quality requirements of this kind of water injection, only two processes are required: degreasing the oily sewage through the swirl pre-oil removal module and filtering the multi-layer filter material filtration module, and finally The treated sewage is discharged from the outlet of the multi-layer filter material filter tank, and the treated sewage can be used to meet the injection water quality requirements when the air permeability of the injection layer is greater than or equal to 1.5 μm ² .

The above content is a further description of the utility model in conjunction with specific embodiments, and in other embodiments of the utility model, the emphases of each treatment module in the oily sewage treatment system are different, and the selection can be made according to the different requirements of the injection water quality The required oily sewage treatment system is formed through process pipeline valves, and is not limited to the five process modules in the embodiment; among them, the pre-oil removal cyclone module can be replaced by a common cyclone, and the sintered filter tank can also be used. The filter device extrudes the impurities into blocks and discharges them; these replacements do not depart from the concept of the utility model, and some other deduction replacements should be regarded as the protection scope of the utility model.

Claims (8)

1. an oil-containing sewage treatment system, including the pre-oil removing module, settling module and the filtering module that are linked in sequence by pipeline, it is characterized in that: the first connecting tube being arranged in parallel with settling module that oil-containing sewage treatment system also includes connecting pre-oil removing module and filtering module, first connecting tube is provided with the first valve, the pipeline that pre-oil removing module is connected with settling module is provided with the second valve in the downstream of the import of the first connecting tube.

2. a kind of oil-containing sewage treatment system according to claim 1, it is characterized in that: described filtering module includes circulate by pipeline the multilamellar media filtration device, modified fibre ball filtering device and the sintering defecator that are linked in sequence, is provided with the 3rd valve between described multilamellar media filtration device and modified fibre ball filtering device.

3. a kind of oil-containing sewage treatment system according to claim 1 and 2, it is characterised in that: being provided with medicated module on the pipeline that described pre-oil removing module is connected with settling module, described medicated module is between the import and the second valve of the first connecting tube.

4. a kind of oil-containing sewage treatment system according to claim 3, it is characterized in that: oil-containing sewage treatment system also includes connecting pre-oil removing module and settling module second connecting tube in parallel with medicated module, being provided with the 4th valve on second connecting tube, the downstream of the import that the pipeline that pre-oil removing module connects with medicated module is positioned at the second connecting tube is provided with the 5th valve.

5. a kind of oil-containing sewage treatment system according to claim 3, it is characterised in that: it is provided with the 6th valve between described modified fibre ball filtering device and sintering defecator.

6. a kind of oil-containing sewage treatment system according to claim 1, it is characterised in that: described pre-oil removing module includes the pre-grease trap of eddy flow being provided with liquid-liquid hydraulic cyclone pipe, and described settling module includes horizontal efficient coalescence settling tank.

7. a kind of oil-containing sewage treatment system according to claim 6, it is characterized in that: described horizontal efficient coalescence settling tank includes inclined plate sedimentation chamber and free settling chamber, is each provided with the receipts mud groove for reclaiming impurity bottom described inclined plate sedimentation chamber and free settling chamber.

8. a kind of oil-containing sewage treatment system according to claim 7, it is characterised in that: described inclined plate sedimentation chamber is provided with swash plate, and described swash plate is glass steel material.