CN117902785B - Oilfield sewage treatment system and treatment method - Google Patents
Oilfield sewage treatment system and treatment method Download PDFInfo
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- CN117902785B CN117902785B CN202410306712.XA CN202410306712A CN117902785B CN 117902785 B CN117902785 B CN 117902785B CN 202410306712 A CN202410306712 A CN 202410306712A CN 117902785 B CN117902785 B CN 117902785B
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- 239000010865 sewage Substances 0.000 title claims abstract description 147
- 238000011282 treatment Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000007667 floating Methods 0.000 claims abstract description 138
- 239000006260 foam Substances 0.000 claims abstract description 125
- 238000000926 separation method Methods 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000004062 sedimentation Methods 0.000 claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 13
- 230000002572 peristaltic effect Effects 0.000 claims description 34
- 230000006837 decompression Effects 0.000 claims description 21
- 238000004200 deflagration Methods 0.000 claims description 19
- 238000005188 flotation Methods 0.000 claims description 17
- 239000002912 waste gas Substances 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 15
- 238000004880 explosion Methods 0.000 claims description 13
- 238000006386 neutralization reaction Methods 0.000 claims description 11
- 239000000446 fuel Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000007790 scraping Methods 0.000 claims description 5
- 239000002737 fuel gas Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 18
- 238000009300 dissolved air flotation Methods 0.000 description 3
- 239000008394 flocculating agent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012053 oil suspension Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Abstract
The invention discloses an oilfield sewage treatment system and a treatment method, which relate to the technical field of sewage treatment and comprise a three-phase separator, a floating foam separation device, a floating foam collection bin and a combustion air floating bin; the device comprises a sedimentation tank, a solid-liquid separation device and a sedimentation tank, wherein the water outlet end of the solid-liquid separation device is communicated with the water inlet end of the sedimentation tank, the water outlet end of the sedimentation tank is communicated with the water inlet end of a three-phase separator, and the three-phase separator is used for separating oil from water in oilfield sewage. The oilfield sewage treatment system and the oilfield sewage treatment method not only can ensure the treatment effect on suspended oil and slightly soluble suspended particles in sewage, but also can effectively utilize oily dirt floating foam generated in the sewage treatment process, so that the air floatation treatment process of the sewage is more efficient and environment-friendly, and compared with the existing air floatation machine sewage treatment system, the oilfield sewage treatment system can get rid of the dependence on a high-load air compressor, reduce the consumption of electric energy and has great popularization value.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an oilfield sewage treatment system and a treatment method.
Background
In recent years, the exploitation force of the oil field is continuously increased, and the problem is that the oil field sewage is increased increasingly, so that the ecological environment is harmfully developed. The oilfield sewage is often mixed with a large amount of floating oil, suspended oil and slightly soluble suspended particles, which results in complex treatment procedures of the oilfield sewage. The prior oilfield sewage treatment system generally carries out primary treatment on sewage through a solid-liquid separation device and a sedimentation tank, and then carries out oil-water separation through a three-phase separator, however, only floating oil and floating foam in the sewage can be separated through the three-phase separator, and the suspended oil and slightly soluble suspended particles in the sewage are difficult to separate. As sewage is circulated in the water treatment pipeline system for a plurality of times, the degree of oil suspension in the sewage and the treatment difficulty are increased.
Aiming at suspended oil and slightly soluble suspended particles in sewage, two main current treatment methods exist at present, namely a flocculating agent sedimentation method, wherein a large amount of chemical flocculating agents are required to be added in the flocculating agent sedimentation method, so that consumable pollution is easy to cause, and the later treatment process is complicated; and secondly, air floatation, namely, injecting high-pressure gas into sewage to dissolve the high-pressure gas into the sewage, then forming a large number of tiny bubbles in the sewage under normal pressure, and adsorbing the tiny bubbles on sewage impurities, so that the sewage impurities suspended in the water float on a water layer to form a foam layer, and removing the foam layer through a scraping plate or other equipment to achieve the aim of purifying water quality. The air floatation method has good treatment effect on suspended oil and slightly soluble suspended particles, does not cause consumable pollution, and is widely used at present.
When sewage is treated by the dissolved air method, air needs to be compressed, high-pressure air is dissolved in the sewage, and an air compressor is required to do work. In order to increase the air-dissolving amount of sewage and make the bubbles finer to ensure the treatment effect on suspended oil and slightly-dissolved suspended particles in sewage, air is usually required to be compressed to more than 0.4MPa, so that the load of an air compressor is very large. In the current dissolved air flotation machine sewage treatment system, the energy consumption of an air compressor can always occupy 80% of the whole system, and the energy consumption and the energy cost are high. In addition, the greasy dirt floating foam generated by the sewage treatment by the air floatation method can not be effectively utilized, and the greasy dirt floating foam also needs to be subjected to post-treatment, so that additional trouble is caused.
Accordingly, an oilfield sewage treatment system and method is presented herein.
Disclosure of Invention
The invention provides the following technical scheme for solving the technical problems: an oilfield sewage treatment system comprises a three-phase separator, a floating foam separation device, a floating foam collection bin and a combustion air floating bin;
The device comprises a sedimentation tank, a solid-liquid separation device and a sedimentation tank, wherein the water outlet end of the solid-liquid separation device is communicated with the water inlet end of the sedimentation tank, the water outlet end of the sedimentation tank is communicated with the water inlet end of a three-phase separator, and the three-phase separator is used for separating oil from water in oilfield sewage.
The sewage outlet of the three-phase separator is communicated with the water inlet end of the gas-fired air floatation bin, the floating oil outlet of the three-phase separator is communicated with the feed end of the floating foam separating device, and the floating foam separating device is used for separating out floating foam in the floating oil, and the floating foam is stored through the floating foam collecting bin.
The floating foam collecting bin comprises a peristaltic pump a, and the peristaltic pump a is used for pumping the floating foam stored in the floating foam collecting bin into the gas-fired floating bin.
The air in the gas-fired air floatation bin is pressurized by taking the floating foam as fuel, so that high-pressure air is dissolved into sewage in the gas-fired air floatation bin, and suspended oil in the sewage is subjected to air floatation separation in a decompression process.
In a combustion air floatation bin:
the gas-fired air floating bin comprises an explosion-proof bin, the outer surface of the explosion-proof bin is fixedly connected with a floating foam bin, the top of the explosion-proof bin is provided with a deflagration cavity, the middle of the explosion-proof bin is provided with a piston cavity, the inside of the piston cavity is slidably provided with a piston plate, a partition plate is arranged between the piston cavity and the deflagration cavity, the partition plate is fixedly connected with the inner wall of the explosion-proof bin, a tension spring is arranged in the piston cavity, the top and the bottom of the tension spring are respectively fixedly connected with the partition plate and the piston plate, and the piston plate has an upward movement trend through the tension spring. The bottom of the explosion-proof bin is provided with an air floatation cavity.
The top of the air floatation cavity is provided with an air pressure sensor a for detecting the air pressure in the air floatation cavity; the top of the piston cavity is provided with an air pressure sensor b for detecting air pressure in the piston cavity; the inside of the air floatation cavity is provided with a stirrer which is used for stirring oilfield sewage; the bottom of the air floatation cavity is provided with a liquid level sensor for detecting the water level of sewage in the air floatation cavity.
The inside of deflagration chamber is provided with protection frame, box with a net, check valve a and ignition, protection frame and box with a net are all fixed connection in the upper surface of baffle, box with a net and ignition all are located the inside of protection frame, and ignition is corresponding with the position of box with a net, check valve a's output fixed connection is in the top of box with a net, check valve a's input is linked together with peristaltic pump a's output through check valve c.
The inside of deflagration chamber is fixed to be provided with a plurality of check valves e, and a plurality of check valves e encircle setting up in the periphery of protection frame, check valve e's input is provided with the air filter screen, the bottom edge of baffle is fixed to inlay has a plurality of intake pipes, check valve e's output is linked together with the piston chamber through the intake pipe.
The pipeline between the check valve c and the peristaltic pump a is fixedly communicated with a check valve d, and the input end of the check valve d is fixedly communicated with an air pump.
The explosion-proof bin is provided with an electric valve c, an electric valve d and an electric valve b outside, one end of the electric valve c is communicated with the deflagration cavity, one end of the electric valve d is communicated with the piston cavity, and the electric valve b is communicated with the bottom of the air floatation cavity.
Further, the outside of combustion-gas floatation bin is provided with waste gas decompression bin and waste gas neutralization tank, the output in waste gas decompression bin is linked together with the input in waste gas neutralization tank, electric valve c's the other end and electric valve d's the other end all is linked together with the input in waste gas decompression bin through the pipeline.
The outer wall of explosion-proof storehouse is fixed to be linked together and is had the air duct, the one end of air duct is linked together with the top in air supporting chamber, the other end of air duct extends to the outside in explosion-proof storehouse and fixed intercommunication has motorised valve a.
Foam discharging holes are formed in the side walls of the explosion-proof bin, and the top of the air floatation cavity is communicated with the foam floating bin through the foam discharging holes.
The inner wall fixedly connected with baffle in explosion-proof storehouse, and the baffle is located the top in air supporting chamber, the fixed electric putter that inlays of lateral wall in explosion-proof storehouse, the flexible end of electric putter extends to the inside fixedly connected with scraper blade in air supporting chamber, the scraper blade is kept away from the bottom of electric putter a side and is articulated to have the doctor-bar, a side fixedly connected with closing plate that the electric putter was kept away from to the scraper blade, and the closing plate is corresponding with the position in foam hole.
The bottom of the explosion-proof bin is provided with a one-way valve b, the input end of the one-way valve b is communicated with a sewage outlet of the three-phase separator, the output end of the one-way valve b is communicated with the air floatation cavity, and the floating foam bin is communicated with the feeding end of the floating foam collecting bin through a peristaltic pump b.
Further, the oilfield sewage treatment system further comprises a post-stage treatment system and a filtering device, wherein the post-stage treatment system is communicated with the electric valve b through a pipeline, the output end of the filtering device is communicated with the one-way valve b, and the input end of the filtering device is communicated with a sewage outlet of the three-phase separator.
Based on the oilfield sewage treatment system, the oilfield sewage treatment system comprises the following treatment methods:
1. The oil field sewage is subjected to solid-liquid separation and sedimentation tank to remove particle impurities and sediments, then oil-water separation is performed through a three-phase separator, the bottom sewage after oil-water separation is filtered through a filtering device and then is conveyed to the inside of a gas-fired air floatation bin for air floatation treatment, the upper layer of floating oil after oil-water separation is separated into oil liquid and floating foam through a floating foam separation device, the oil liquid is conveyed to other systems for treatment, the floating foam is transferred to a floating foam collection bin, and then is conveyed to the gas-fired air floatation bin through a peristaltic pump a to be used as fuel of the gas-fired air floatation bin.
2. And (3) carrying out air floatation treatment on sewage by using a fuel gas air floatation bin:
A. And closing the electric valve b, opening the electric valve a and the electric valve d, enabling the piston plate to be at the highest position of the stroke of the piston plate, enabling sewage to enter the air floatation cavity through the one-way valve b until the liquid level in the air floatation cavity reaches a target value, closing the electric valve a and the electric valve d, and starting the stirrer.
B. And starting the electric push rod to extend the electric push rod, and moving the scraping plate towards the direction of the foam discharging hole until the sealing plate completely seals the foam discharging hole.
C. deflagration pressurization is carried out in the combustion pressure air floatation bin:
opening a one-way valve c (4103), starting an air pump to inject air into the explosion cavity, starting a peristaltic pump a, injecting floating foam into a net cage in the explosion cavity, closing an electric valve c and the peristaltic pump a after the floating foam reaches a target amount, closing the electric valve c, and starting an ignition device to burn the floating foam.
D. Repeating the step C for a plurality of times, so that the air pressure value in the air floatation cavity is maintained in a set air pressure value interval, and keeping the pressure for 3-5 minutes in a floating mode;
setting the air pressure value interval as [ y, z ], wherein y is more than or equal to 0.5MPa, z is less than or equal to 0.7MPa, and z-y is less than or equal to 0.02MPa; namely, the air pressure floating difference of floating pressure maintaining is less than or equal to 0.02MPa.
E. And closing the stirrer, opening the electric valve c and the electric valve d, discharging high-pressure waste gas in the deflagration cavity and the piston cavity into the waste gas decompression bin for decompression, purifying by the waste gas neutralization tank, and opening the electric valve a to balance the air pressure in the air floatation cavity with the air pressure outside the explosion-proof bin.
F. starting an electric push rod to shorten the electric push rod until suspended oil in sewage in the air floatation cavity floats to the upper surface of the sewage, starting the electric push rod again, pushing suspended oil foam into the floating foam bin through the scraping plate, and then starting a peristaltic pump b to convey the floating foam in the floating foam bin into the floating foam collecting bin for storage.
3. After the sewage is subjected to air floatation treatment through the fuel-air floatation bin, the electric valve b is opened, and then the sewage is subjected to post-treatment through the post-treatment system.
Post-treatment of sewage generally includes chemical and biological treatments, and the post-treatment system is implemented in combination with the prior art.
Compared with the prior art, the oilfield sewage treatment system and the oilfield sewage treatment method have the following beneficial effects:
1. In the invention, a three-phase separator separates floating foam in the floating oil from the floating oil after sewage separation through a floating foam separation device, and the floating foam is stored in a floating foam collecting bin; the sewage separated by the three-phase separator is subjected to air floatation treatment by utilizing the gas-fired air floatation bin, the gas-fired air floatation bin takes floating foam as fuel, air in the gas-fired air floatation bin is pressurized, so that high-pressure air is dissolved into the sewage in the gas-fired air floatation bin, then suspended oil in the sewage is subjected to air floatation separation in a decompression process, and the floating foam generated after the air floatation separation is stored in the floating foam collecting bin to be used as fuel of the gas-fired air floatation bin. Not only can ensure the treatment effect of suspended oil and slightly soluble suspended particles in sewage, but also can efficiently utilize the greasy dirt floating foam generated in the sewage treatment process, so that the air floatation treatment process of the sewage is more efficient and environment-friendly.
2. Compared with the existing air flotation machine sewage treatment system, the oilfield sewage treatment system combined with the treatment method can get rid of dependence on a high-load air compressor, reduces consumption of electric energy, has great popularization value, and has breakthrough popularization significance in technical practice of sewage treatment by a dissolved air method.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a system flow diagram of the present invention;
FIG. 2 is a schematic diagram of the internal structure of the combustion air floatation bin;
FIG. 3 is an enlarged schematic view of the structure shown at W in FIG. 2 according to the present invention.
In the figure:
1. A three-phase separator; 2. a froth separation device;
3. A floating foam collection bin; 31. peristaltic pump a;
4. A combustion air floatation bin;
401. A deflagration chamber;
402. a piston chamber;
403. An air floatation cavity;
41. An explosion-proof bin;
4101. a one-way valve b; 4102. a foam discharging hole; 4103. a one-way valve c; 4104. a one-way valve d; 4105. an air pump; 4106. an air duct; 4107. an electric valve a; 4108. an electric valve c; 4109. an electric valve d; 4110. an electric valve b; 4111. a baffle; 4112. an electric push rod; 4113. a scraper; 4114. a wiper blade; 4115. a sealing plate; 4116. a stirrer; 4117. a liquid level sensor; 4118. a barometric pressure sensor a; 4119. a barometric pressure sensor b;
42. A floating foam bin; 421. a peristaltic pump b;
43. a piston plate;
44. A partition plate;
441. a one-way valve e; 442. an air filter screen; 443. an air inlet pipe;
45. a protective frame; 46. a cage; 47. a one-way valve a; 48. an ignition device; 49. a tension spring;
5. a solid-liquid separation device; 6. a sedimentation tank; 7. a waste gas decompression bin; 8. an exhaust gas neutralization tank; 9. a post-processing system; 10. and a filtering device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, the present invention provides the following technical solutions: an oilfield sewage treatment system and a treatment method.
Referring to fig. 1, an oilfield sewage treatment system comprises a three-phase separator 1, a froth separation device 2, a froth collection bin 3 and a combustion air flotation bin 4.
The oilfield sewage treatment system also comprises a solid-liquid separation device 5 and a sedimentation tank 6, wherein the water outlet end of the solid-liquid separation device 5 is communicated with the water inlet end of the sedimentation tank 6, and the water outlet end of the sedimentation tank 6 is communicated with the water inlet end of the three-phase separator 1. The oilfield sewage is pretreated by a solid-liquid separation device 5 and a sedimentation tank 6 to remove particle impurities and sediments, and then flows into a three-phase separator 1, and the three-phase separator 1 is used for carrying out oil-water separation on the oilfield sewage.
The above embodiments of the three-phase separator 1, the froth separation device 2, the solid-liquid separation device 5 and the sedimentation tank 6 are all implemented by the prior art.
The sewage outlet of the three-phase separator 1 is communicated with the water inlet end of the combustion-pressure air floatation bin 4, the floating oil outlet of the three-phase separator 1 is communicated with the feed end of the floating foam separating device 2, the floating foam separating device 2 is used for separating out floating foam in the floating oil, and the floating foam is stored through the floating foam collecting bin 3.
The floating foam collecting bin 3 comprises a peristaltic pump a31, and the peristaltic pump a31 is used for pumping the floating foam stored in the floating foam collecting bin 3 into the combustion air floating bin 4.
The gas-fired floatation bin 4 takes the foam as fuel to pressurize the air in the gas-fired floatation bin 4, so that the high-pressure air is dissolved into the sewage in the gas-fired floatation bin 4, and then the suspended oil in the sewage is subjected to air floatation separation in the process of decompression.
Referring to fig. 2, in the combustion air floatation tank 4:
The gas-fired air floating bin 4 comprises an explosion-proof bin 41, a floating foam bin 42 is fixedly connected to the outer surface of the explosion-proof bin 41, a deflagration cavity 401 is arranged at the top of the explosion-proof bin 41, a piston cavity 402 is arranged in the middle of the explosion-proof bin 41, and a piston plate 43 is slidably arranged in the piston cavity 402.
A partition plate 44 is arranged between the piston cavity 402 and the explosion cavity 401, the partition plate 44 is fixedly connected to the inner wall of the explosion-proof bin 41, and the partition plate 44 is in sealing connection with the inner wall of the explosion-proof bin 41.
A tension spring 49 is arranged in the piston cavity 402, the top end and the bottom end of the tension spring 49 are fixedly connected with the partition plate 44 and the piston plate 43 respectively, and the tension spring 49 enables the piston plate 43 to have upward movement trend. The bottom of the explosion-proof bin 41 is provided with an air floatation cavity 403, and oilfield sewage is subjected to air floatation treatment in the air floatation cavity 403.
The top of the air-float cavity 403 is provided with an air pressure sensor a4118 for detecting the air pressure in the air-float cavity 403; the top of the piston cavity 402 is provided with a gas pressure sensor b4119 for detecting the gas pressure in the piston cavity 402; the air floatation cavity 403 is internally provided with a stirrer 4116 for stirring oilfield sewage; the bottom of the air-float cavity 403 is provided with a liquid level sensor 4117 for detecting the water level of the sewage in the air-float cavity 403.
The inside of explosion chamber 401 is provided with a protective frame 45, a net cage 46, a check valve a47 and an ignition device 48. Wherein, the net cage 46 is made of stainless steel net with 15-20 meshes, and the one-way valve a47 is made of refractory and corrosion-resistant metal.
The protective frame 45 and the net cage 46 are fixedly connected to the upper surface of the partition 44, the net cage 46 and the ignition device 48 are both positioned in the protective frame 45, the ignition device 48 corresponds to the net cage 46 in position, the output end of the check valve a47 is fixedly connected to the top of the net cage 46, and the input end of the check valve a47 is communicated with the output end of the peristaltic pump a31 through the check valve c 4103.
In the above-described scheme, the froth in the froth collecting bin 3 is pumped into the net cage 46 by the peristaltic pump a31, and the froth in the net cage 46 is ignited by the ignition device 48.
The inside of the deflagration cavity 401 is fixedly provided with a plurality of one-way valves e441, the one-way valves e441 are arranged around the periphery of the protective frame 45, the input end of each one-way valve e441 is provided with an air filter screen 442, a plurality of air inlet pipes 443 are fixedly inlaid at the bottom edge of the partition plate 44, and the output end of each one-way valve e441 is communicated with the piston cavity 402 through the air inlet pipe 443.
When the foam in the net cage 46 burns, the deflagration happens in the deflagration cavity 401 to increase the internal air pressure, and the internal air flows into the piston cavity 402 through the one-way valve e441 and the air inlet pipe 443, so that the air pressure in the piston cavity 402 is increased to push the piston plate 43 to move downwards, and the air below the piston plate 43 and in the air flotation cavity 403 is compressed, so that the high-pressure air is dissolved in the sewage at the bottom of the air flotation cavity 403.
A check valve d4104 is fixedly communicated with a pipeline between the check valve c4103 and the peristaltic pump a31, and an air pump 4105 is fixedly communicated with an input end of the check valve d 4104. Air can be injected into explosion chamber 401 by air pump 4105, and air is supplied to the combustion reaction.
The explosion-proof chamber 41 is provided with an electric valve c4108, an electric valve d4109, and an electric valve b4110 at the outside.
One end of the electric valve c4108 communicates with the explosion chamber 401, and one end of the electric valve d4109 communicates with the piston chamber 402. By opening the electric valve c4108 and the electric valve d4109, high-pressure gas in the deflagration cavity 401 and the piston cavity 402 can be discharged, so that the sewage in the air floatation cavity 403 is depressurized, a large number of tiny bubbles are generated in the sewage, the tiny bubbles are combined with suspended oil particles in the sewage, so that suspended oil in the sewage floats upwards to form a floating foam layer, and air floatation treatment of the sewage in the air floatation cavity 403 is realized.
The electric valve b4110 communicates with the bottom of the air-floating chamber 403. The sewage after the air-floating treatment in the air-floating chamber 403 is discharged through the electric valve b 4110.
Further, an exhaust gas decompression bin 7 and an exhaust gas neutralization tank 8 are arranged outside the combustion gas floatation bin 4, the output end of the exhaust gas decompression bin 7 is communicated with the input end of the exhaust gas neutralization tank 8, and the other end of the electric valve c4108 and the other end of the electric valve d4109 are both communicated with the input end of the exhaust gas decompression bin 7 through pipelines.
The above-described specific constructions of the exhaust gas decompression chamber 7 and the exhaust gas neutralization tank 8 for treating the exhaust gas after the internal combustion of the explosion-proof chamber 41 are implemented in combination with the prior art.
The outer wall of the explosion-proof bin 41 is fixedly communicated with an air guide pipe 4106, one end of the air guide pipe 4106 is communicated with the top of the air floatation cavity 403, and the other end of the air guide pipe 4106 extends to the outside of the explosion-proof bin 41 and is fixedly communicated with an electric valve a4107. Opening the electric valve a4107 can balance the air pressure in the air-floating chamber 403 with the air pressure outside the explosion-proof chamber 41.
The side wall of the explosion-proof bin 41 is provided with a foam discharging hole 4102, and the top of the air flotation cavity 403 is communicated with the foam floating bin 42 through the foam discharging hole 4102.
Referring to fig. 2 and 3, a baffle 4111 is fixedly connected to an inner wall of the explosion-proof chamber 41, the baffle 4111 is located at the top of the air-float chamber 403, an electric push rod 4112 is fixedly embedded in a side wall of the explosion-proof chamber 41, a scraper 4113 is fixedly connected to an inner portion of the air-float chamber 403, which extends from a telescopic end of the electric push rod 4112, and a scraper 4114 is hinged to a bottom of a side surface of the scraper 4113, which is far away from the electric push rod 4112. By controlling the extension or shortening of the electric push rod 4112, the floating foam on the air-floating treated sewage in the air-floating chamber 403 can be pushed into the floating foam bin 42.
A sealing plate 4115 is fixedly connected to a side surface of the scraper 4113 away from the electric push rod 4112, and the sealing plate 4115 corresponds to the position of the foam discharging hole 4102. When sewage is subjected to air floatation treatment in the air floatation cavity 403, the electric push rod 4112 is controlled to extend, so that the sealing plate 4115 can seal the foam discharging hole 4102.
The bottom of the explosion-proof bin 41 is provided with a one-way valve b4101, the input end of the one-way valve b4101 is communicated with the sewage outlet of the three-phase separator 1, and the sewage of the three-phase separator 1 flows unidirectionally into the explosion-proof bin 41 through the one-way valve b 4101. The output end of the check valve b4101 is communicated with the air floatation cavity 403, and the floating foam bin 42 is communicated with the feeding end of the floating foam collecting bin 3 through a peristaltic pump b 421. When the peristaltic pump b421 works, the froth in the peristaltic pump b421 can be conveyed into the froth collection bin 3 for storage.
Further, the oilfield sewage treatment system also comprises a post-treatment system 9 and a filtering device 10.
The post-treatment system 9 is communicated with the electric valve b4110 through a pipeline, and the post-treatment system 9 is used for performing post-treatment on the sewage after the air flotation treatment, wherein the post-treatment of the sewage generally comprises chemical treatment and biological treatment, and is implemented in combination with the prior art.
The output end of the filtering device 10 is communicated with the one-way valve b4101, and the input end of the filtering device 10 is communicated with the sewage outlet of the three-phase separator 1. Wherein, the filtering device 10 is implemented in combination with the prior art, and the sewage treated by the three-phase separator 1 is filtered by the filtering device 10 and then enters the combustion air floatation bin 4 through the one-way valve b4101 for air floatation treatment, so that the sewage treatment effect can be further improved.
Based on the oilfield sewage treatment system, the oilfield sewage treatment system comprises the following treatment methods:
1. The oil field sewage is subjected to oil-water separation through a solid-liquid separation device 5 and a sedimentation tank 6, then is subjected to oil-water separation through a three-phase separator 1, the bottom sewage after oil-water separation is filtered through a filtering device 10 and then is conveyed into a gas-fired air floatation bin 4 for air floatation treatment, the upper-layer floating oil after oil-water separation is separated into oil liquid and floating foam through a floating foam separation device 2, the oil liquid is conveyed to other systems for treatment, the floating foam is transferred into a floating foam collecting bin 3 and is conveyed into the gas-fired air floatation bin 4 through a peristaltic pump a31 to be used as fuel of the gas-fired air floatation bin 4.
2. And (3) carrying out air floatation treatment on sewage by using a fuel gas air floatation bin 4:
A. Closing the electric valve b4110, opening the electric valve a4107 and the electric valve d4109, enabling the piston plate 43 to be at the highest position of the stroke, enabling sewage to enter the air floatation chamber 403 through the one-way valve b4101 until the liquid level in the air floatation chamber 403 reaches the target value, then closing the electric valve a4107 and the electric valve d4109, and starting the stirrer 4116.
B. The electric pushrod 4112 is activated to extend the electric pushrod 4112 and the scraper 4113 moves in the direction of the drain hole 4102 until the sealing plate 4115 completely seals the drain hole 4102.
C. deflagration pressurization is carried out in the combustion pressure air floatation bin 4:
Opening the check valve c (4103), starting the air pump 4105 to inject air into the explosion cavity 401, starting the peristaltic pump a31, injecting foam into the net cage 46 in the explosion cavity 401, closing the electric valve c4108 and the peristaltic pump a31 after the foam amount reaches the target amount, closing the electric valve c4108, and starting the ignition device 48 to burn the foam.
In step C, by froth combustion, knocking occurs in the knocking chamber 401 to raise the internal air pressure, and the internal air flows into the piston chamber 402 through the check valve e441 and the air inlet pipe 443, so that the air pressure in the piston chamber 402 is raised to push the piston plate 43 to move downward, and the air under the piston plate 43 and in the air floating chamber 403 is compressed.
D. repeating the step C for a plurality of times, so that the air pressure value in the air floatation cavity 403 is maintained in a set air pressure value interval, and floating and maintaining the pressure for 3-5 minutes, so that high-pressure air is dissolved into the sewage in the air floatation cavity 403;
setting the air pressure value interval as [ y, z ], wherein y is more than or equal to 0.5MPa, z is less than or equal to 0.7MPa, and z-y is less than or equal to 0.02MPa; namely, the air pressure floating difference of floating pressure maintaining is less than or equal to 0.02MPa.
E. The stirrer 4116 is closed, the electric valve c4108 and the electric valve d4109 are opened, the high-pressure exhaust gas in the explosion chamber 401 and the piston chamber 402 is discharged into the exhaust gas decompression chamber 7 to be decompressed, and then the exhaust gas is purified by the exhaust gas neutralization tank 8, and then the electric valve a4107 is opened to balance the air pressure in the air floating chamber 403 with the air pressure outside the explosion-proof chamber 41.
At this time, the sewage in the air floating cavity 403 is depressurized, so that a large number of tiny bubbles are generated in the sewage, and the tiny bubbles are combined with suspended oil particles in the sewage, so that suspended oil in the sewage floats upwards, and a floating foam layer is formed.
F. the electric push rod 4112 is started, so that the electric push rod 4112 is shortened until the suspended oil in the sewage in the air flotation cavity 403 floats to the upper surface of the sewage, the electric push rod 4112 is started again, the suspended oil foam is pushed into the floating foam bin 42 through the scraping plate 4113, and then the peristaltic pump b421 is started to convey the floating foam in the floating foam bin 42 into the floating foam collecting bin 3 for storage.
3. After the sewage is subjected to air floatation treatment through the air floatation bin 4, the electric valve b4110 is opened, and then the sewage is subjected to post-treatment through the post-treatment system 9.
In summary, in the invention, the three-phase separator 1 separates the floating foam in the floating oil from the floating oil after the sewage is separated by the floating foam separating device 2, and the floating foam is stored in the floating foam collecting bin 3; the sewage separated by the three-phase separator 1 is subjected to air floatation treatment by utilizing the air floatation bin 4, the air floatation bin 4 takes floating foam as fuel, air in the air floatation bin 4 is pressurized so that high-pressure air is dissolved into the sewage in the air floatation bin 4, then suspended oil in the sewage is subjected to air floatation separation through a decompression process, and the floating foam generated after the air floatation separation is stored in the floating foam collecting bin 3 to be used as fuel of the air floatation bin 4. Not only can ensure the treatment effect of suspended oil and slightly soluble suspended particles in sewage, but also can efficiently utilize the greasy dirt floating foam generated in the sewage treatment process, so that the air floatation treatment process of the sewage is more efficient and environment-friendly. In addition, compared with the current sewage treatment system of the dissolved air flotation machine, the invention realizes the air flotation treatment of sewage by utilizing the gas-fired air flotation bin 4, can get rid of the dependence on a high-load air compressor, reduces the consumption of electric energy, has great popularization value, and has breakthrough popularization significance in the technical practice of treating sewage by the dissolved air flotation method.
Based on the above embodiment and implementation method, the peristaltic pump a31, the peristaltic pump b421, the air pump 4105, the electric valve a4107, the electric valve c4108, the electric valve d4109, the electric valve b4110, the electric push rod 4112, the stirrer 4116, the ignition device 48, the liquid level sensor 4117, the air pressure sensor a4118 and the air pressure sensor b4119 are all electrically connected with an intelligent controller, and the intelligent controller performs intelligent control on the above electric components to complete the intelligent treatment process of the oilfield sewage and realize the high-quality and high-efficiency treatment effect by combining the implementation purpose of the invention with the existing electric technology.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects 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 (9)
1. The utility model provides an oil field sewage treatment system, includes three-phase separator (1), foam separator (2), foam collection storehouse (3) and fires compressed air floating storehouse (4), its characterized in that:
The three-phase separator (1) is used for carrying out oil-water separation on oilfield sewage, a sewage outlet of the three-phase separator (1) is communicated with a water inlet end of the combustion air floating bin (4), a floating oil outlet of the three-phase separator (1) is communicated with a feed end of the floating foam separating device (2), the floating foam separating device (2) is used for separating out floating foam in the floating oil, and the floating foam is stored through the floating foam collecting bin (3);
The floating foam collecting bin (3) comprises a peristaltic pump a (31), and the peristaltic pump a (31) is used for pumping the floating foam stored in the floating foam collecting bin (3) into the gas-fired floating foam bin (4);
the gas-fired floatation bin (4) takes floating foam as fuel to pressurize air in the gas-fired floatation bin (4) so that high-pressure air is dissolved into sewage in the gas-fired floatation bin (4), and then suspended oil in the sewage is subjected to gas-flotation separation in a decompression process;
The gas-fired air flotation bin (4) comprises an explosion-proof bin (41), the outer surface of the explosion-proof bin (41) is fixedly connected with a flotation bin (42), the top of the explosion-proof bin (41) is provided with a deflagration cavity (401), the middle of the explosion-proof bin (41) is provided with a piston cavity (402), the inside of the piston cavity (402) is slidably provided with a piston plate (43), a partition plate (44) is arranged between the piston cavity (402) and the deflagration cavity (401), the partition plate (44) is fixedly connected to the inner wall of the explosion-proof bin (41), a tension spring (49) is arranged in the piston cavity (402), the top end and the bottom end of the tension spring (49) are fixedly connected with the partition plate (44) and the piston plate (43) respectively, and the bottom of the explosion-proof bin (41) is provided with an air flotation cavity (403);
a plurality of one-way valves e (441) are fixedly arranged in the deflagration cavity (401), and the output ends of the one-way valves e (441) are communicated with the piston cavity (402);
The explosion cavity (401) is internally provided with a protective frame (45), a net cage (46), a one-way valve a (47) and an ignition device (48), wherein the input end of the one-way valve a (47) is communicated with the output end of the peristaltic pump a (31) through a one-way valve c (4103);
an electric valve c (4108), an electric valve d (4109) and an electric valve b (4110) are arranged outside the explosion-proof bin (41), one end of the electric valve c (4108) is communicated with the explosion cavity (401), one end of the electric valve d (4109) is communicated with the piston cavity (402), and the electric valve b (4110) is communicated with the bottom of the air floatation cavity (403);
An air duct (4106) is fixedly communicated with the outer wall of the explosion-proof bin (41), one end of the air duct (4106) is communicated with the top of the air floatation cavity (403), and the other end of the air duct (4106) extends to the outside of the explosion-proof bin (41) and is fixedly communicated with an electric valve a (4107);
a foam discharging hole (4102) is formed in the side wall of the explosion-proof bin (41), and the top of the air flotation cavity (403) is communicated with the foam floating bin (42) through the foam discharging hole (4102);
The inner wall fixedly connected with baffle (4111) of explosion-proof storehouse (41), and baffle (4111) are located the top of air supporting chamber (403), the fixed electric putter (4112) that inlays of lateral wall of explosion-proof storehouse (41), the inside fixedly connected with scraper blade (4113) that stretches out and draws back of electric putter (4112) to air supporting chamber (403), the bottom that electric putter (4112) a side was kept away from to scraper blade (4113) articulates there is doctor blade (4114), a side fixedly connected with closing plate (4115) that electric putter (4112) was kept away from to scraper blade (4113), and closing plate (4115) are corresponding with the position of foam hole (4102).
2. An oilfield sewage treatment system according to claim 1, wherein: the protection frame (45) and the net cage (46) are fixedly connected to the upper surface of the partition plate (44), the net cage (46) and the ignition device (48) are both positioned in the protection frame (45), the ignition device (48) corresponds to the net cage (46), and the output end of the one-way valve a (47) is fixedly connected to the top of the net cage (46);
A one-way valve d (4104) is fixedly communicated with a pipeline between the one-way valve c (4103) and the peristaltic pump a (31), and an air pump (4105) is fixedly communicated with the input end of the one-way valve d (4104).
3. An oilfield sewage treatment system according to claim 1, wherein: the plurality of check valves e (441) are arranged around the periphery of the protection frame (45), an air filter screen (442) is arranged at the input end of each check valve e (441), a plurality of air inlet pipes (443) are fixedly inlaid at the edge of the bottom end of each partition plate (44), and the output end of each check valve e (441) is communicated with the piston cavity (402) through each air inlet pipe (443).
4. An oilfield sewage treatment system according to claim 1, wherein: the bottom of the explosion-proof bin (41) is provided with a one-way valve b (4101), the input end of the one-way valve b (4101) is communicated with the sewage outlet of the three-phase separator (1), the output end of the one-way valve b (4101) is communicated with the air floatation cavity (403), and the floating foam bin (42) is communicated with the feeding end of the floating foam collecting bin (3) through a peristaltic pump b (421).
5. An oilfield sewage treatment system according to claim 1, wherein: the top of the air floatation cavity (403) is provided with an air pressure sensor a (4118), and the top of the piston cavity (402) is provided with an air pressure sensor b (4119);
An agitator (4116) is arranged in the air flotation cavity (403), and a liquid level sensor (4117) is arranged at the bottom of the air flotation cavity (403).
6. An oilfield sewage treatment system according to claim 1, wherein: the outside of combustion pressure air floating bin (4) is provided with waste gas decompression storehouse (7) and waste gas neutralization jar (8), the output of waste gas decompression storehouse (7) is linked together with the input of waste gas neutralization jar (8), the other end of motorised valve c (4108) and the other end of motorised valve d (4109) are all linked together with the input of waste gas decompression storehouse (7) through the pipeline.
7. An oilfield sewage treatment system according to claim 1, wherein: the three-phase separator also comprises a post-treatment system (9) and a filtering device (10), wherein the post-treatment system (9) is communicated with the electric valve b (4110) through a pipeline, the output end of the filtering device (10) is communicated with the one-way valve b (4101), and the input end of the filtering device (10) is communicated with the sewage outlet of the three-phase separator (1).
8. An oilfield sewage treatment system according to claim 1, wherein: the three-phase separator is characterized by further comprising a solid-liquid separation device (5) and a sedimentation tank (6), wherein the water outlet end of the solid-liquid separation device (5) is communicated with the water inlet end of the sedimentation tank (6), and the water outlet end of the sedimentation tank (6) is communicated with the water inlet end of the three-phase separator (1).
9. A method of treating an oilfield sewage treatment system according to any one of claims 1 to 8, wherein the oilfield sewage treatment system is configured as follows:
1. The oil field sewage is subjected to solid-liquid separation (5) and a sedimentation tank (6) to remove particle impurities and sediments, then oil-water separation is carried out through a three-phase separator (1), the bottom sewage after oil-water separation is filtered through a filtering device (10) and then is conveyed into a gas-fired floatation bin (4) to be subjected to air floatation treatment, the upper layer of floating oil after oil-water separation is separated into oil liquid and floating foam through a floating foam separation device (2), the oil liquid is conveyed to other systems to be treated, the floating foam is transferred into a floating foam collecting bin (3), and then is conveyed into the gas-fired floatation bin (4) through a peristaltic pump a (31) to be used as fuel of the gas-fired floatation bin (4);
2. The sewage is subjected to air floatation treatment by utilizing a fuel gas air floatation bin (4):
A. Closing the electric valve b (4110), opening the electric valve a (4107) and the electric valve d (4109), enabling the piston plate (43) to be at the highest position of the stroke of the electric valve a (4109), enabling sewage to enter the air floatation cavity (403) through the one-way valve b (4101) until the liquid level in the air floatation cavity (403) reaches a target value, then closing the electric valve a (4107) and the electric valve d (4109), and starting the stirrer (4116);
B. starting the electric push rod (4112) to extend the electric push rod (4112), and moving the scraping plate (4113) towards the direction of the foam discharging hole (4102) until the sealing plate (4115) completely seals the foam discharging hole (4102);
C. deflagration pressurization is carried out in the combustion pressure air floatation bin (4):
Opening a one-way valve c (4103), starting an air pump (4105) to inject air into the explosion cavity (401), starting a peristaltic pump a (31), injecting floating foam into a net cage (46) in the explosion cavity (401), closing the one-way valve c (4103) and the peristaltic pump a (31) after the floating foam reaches a target amount, closing the one-way valve c (4103), and starting an ignition device (48) to burn the floating foam;
D. Repeating the step C for a plurality of times, so that the air pressure value in the air floatation cavity (403) is maintained in a set air pressure value interval, and floating and maintaining the pressure for 3-5 minutes;
setting the air pressure value interval as [ y, z ], wherein y is more than or equal to 0.5MPa, z is less than or equal to 0.7MPa, and z-y is less than or equal to 0.02MPa;
E. Closing the stirrer (4116), opening the electric valve c (4108) and the electric valve d (4109), discharging the high-pressure waste gas in the deflagration cavity (401) and the piston cavity (402) into the waste gas decompression bin (7) for decompression, and purifying by the waste gas neutralization tank (8);
F. Starting an electric push rod (4112) to shorten the electric push rod (4112) until suspended oil in sewage in the air flotation cavity (403) floats to the upper surface of the sewage, starting the electric push rod (4112) again, pushing suspended oil foam into the floating foam bin (42) through the scraper blade (4113), and then starting the peristaltic pump b (421) to convey the floating foam in the floating foam bin (42) into the floating foam collecting bin (3) for storage;
3. After the sewage is subjected to air floatation treatment through the fuel-air floatation bin (4), the electric valve b (4110) is opened, and then the sewage is subjected to post-treatment through the post-treatment system (9).
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