Anti-scaling equipment for evaporation process of drilling and production wastewater

Abstract

The utility model relates to the technical field of scale prevention, in particular to scale prevention equipment in the evaporation process of drilling and production wastewater, which comprises a first primary hardness removal reaction chamber, a water inlet pipeline is fixedly connected to the left side surface of the first primary hardness removal reaction chamber, and a pipeline mixer is fixedly connected to the outer surface of the water inlet pipeline. The outer surface of the pipeline mixer is fixedly connected with an alkali liquor adding device. The device is reasonable in structure, related processes of deep hardness removal of phosphate and synergistic ammonia nitrogen removal are added on the basis of a dual-alkali process, scaling ions in the drilling and production wastewater can be more efficiently removed, meanwhile, the ammonia nitrogen concentration of produced water is reduced, the total hardness of the drilling and production wastewater treated by the device can be reduced from 1200-1500mg / L to below 20mg / L, and the treatment effect of the drilling and production wastewater is improved. The concentration of strontium ions is reduced from 60-80 mg / L to 30 mg / L or below, and the concentration of ammonia nitrogen is reduced from 30-40 mg / L to 15 mg / L or below, so that the scaling of the evaporator is effectively reduced, and meanwhile, the cooperative treatment of the ammonia nitrogen is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of scale prevention, especially relates to a drilling and production wastewater evaporation process scale prevention equipment. BACKGROUND

[0002] The drilling and production wastewater evaporation process scale prevention equipment is mainly designed based on the traditional double-alkali method process by controlling the concentration of scale-forming ions such as calcium, magnesium and strontium in the drilling and production wastewater through chemical precipitation to reduce the scale formation of the evaporation process equipment.

[0003] However, the existing double-alkali method process has limited effect on the removal of total hardness of wastewater, and after the scale-forming ions are concentrated by a high multiple in the wastewater evaporation treatment process, scale will still be formed in the heat exchanger and process pipeline of the multiple-effect evaporator, and the descaling effect is not good. UTILITY MODEL CONTENT

[0004] The utility model discloses a drilling and production wastewater evaporation process scale prevention equipment to solve the shortcoming in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a drilling and production wastewater evaporation process scale prevention equipment, including first grade hard removal reaction chamber, the left side of first grade hard removal reaction chamber is fixedly connected with inlet pipeline, the outer surface of inlet pipeline is fixedly connected with pipeline mixer, the outer surface of pipeline mixer is fixedly connected with lye adding device, the inside of first grade hard removal reaction chamber is provided with sodium carbonate adding device, the right surface of first grade hard removal reaction chamber is fixedly connected with second grade hard removal reaction chamber, the right side wall of first grade hard removal reaction chamber is set up with overflow hole, the right side of second grade hard removal reaction chamber is fixedly connected with secondary hard removal reaction pool, the right side wall of second grade hard removal reaction chamber is set up with overflow groove, the inside of secondary hard removal reaction pool is provided with phosphate adding device, the right side of secondary hard removal reaction pool is fixedly connected with coagulation tank, the right side wall of secondary hard removal reaction pool is set up with overflow channel, the inside of coagulation tank is provided with PAC adding device, the right side of coagulation tank is fixedly connected with flocculation tank, the bottom of coagulation tank is fixedly connected with overflow pipeline, the other end of overflow pipeline is located in the inside of flocculation tank, the inner bottom of flocculation tank is fixedly connected with supporting leg, the upper surface of supporting leg is fixedly connected with flow guide cylinder, the inside of flow guide cylinder is provided with PAM adding device.

[0006] Further description of the above technical scheme:

[0007] The inside of the first primary hard-removal reaction chamber is provided with a first stirrer, the inside of the second primary hard-removal reaction chamber is provided with a second stirrer, the inside of the secondary hard-removal reaction pool is provided with a third stirrer, the inside of the coagulation pool is provided with a fourth stirrer, and the inside of the flocculation pool is provided with a lifting stirrer which is located in the inside of the draft tube.

[0008] As a further description of the above technical solution:

[0009] The right side of the flocculation pool is provided with an inclined tube sedimentation tank, the front side inner wall of the inclined tube sedimentation tank is fixedly connected with an inclined tube device, the front side inner wall of the inclined tube sedimentation tank is fixedly connected with a water outlet weir, the number of the water outlet weir is multiple, the front side of the inclined tube sedimentation tank is provided with a water outlet groove, the number of the water outlet groove is multiple, and the front side of the inclined tube sedimentation tank is fixedly connected with a water outlet pipeline which is in communication with the water outlet groove.

[0010] As a further description of the above technical solution:

[0011] The inside bottom of the inclined tube sedimentation tank is fixedly connected with a sludge bucket, and the number of the sludge bucket is multiple.

[0012] As a further description of the above technical solution:

[0013] The front side of the inclined tube sedimentation tank is fixedly connected with a first pipeline, the number of the first pipeline is three, and the other end of the first pipeline is fixedly connected with a second pipeline.

[0014] As a further description of the above technical solution:

[0015] The right side of the second pipeline is fixedly connected with a sludge discharge pump, and the right side of the sludge discharge pump is fixedly connected with a sludge discharge pipeline.

[0016] As a further description of the above technical solution:

[0017] The left side of the second pipeline is fixedly connected with a sludge backflow screw pump, the left side of the sludge backflow screw pump is fixedly connected with a sludge backflow pipeline, and the other end of the sludge backflow pipeline is fixedly connected in the inside of the overflow pipeline.

[0018] The utility model has the advantages of the following:

[0019] Compared with the prior art, the drilling wastewater evaporation process anti-scaling equipment, through the water inlet pipeline, the first primary hardness removal reaction chamber, the overflow hole, the second primary hardness removal reaction chamber, the secondary hardness removal reaction tank, the third stirrer, the overflow channel, the coagulation tank, the fourth stirrer, the overflow pipeline, the flocculation tank, the flow guide cylinder and the lifting stirrer, the water inlet pipeline sends water into two primary reaction tanks, the primary reaction tank is provided with a reaction chamber, the water inlet of the equipment is arranged at the upper portion of the first primary hardness removal reaction chamber, a sodium carbonate dosing point is arranged at the water inlet, the two reaction tanks are respectively provided with a stirrer, the rotation speed of the stirrer is 80-100 rpm, the hydraulic retention time of each reaction chamber is 1-2 minutes, the wastewater in the first primary hardness removal reaction chamber enters the second primary hardness removal reaction chamber through the overflow hole at the bottom to continue the reaction, the water after the reaction in the second primary hardness removal reaction chamber enters the secondary hardness removal reaction tank through overflow at the upper portion, a phosphate dosing point is arranged at the liquid surface of the water inlet side of the secondary hardness removal reaction tank, the reaction tank is provided with a third stirrer, the rotation speed of the stirrer is 80-100 rpm, and the hydraulic retention time of the reaction tank is 3 minutes, the overflow channel at the bottom of the secondary hardness removal reaction tank enters the coagulation tank from the upper portion of the coagulation tank, a polyaluminum chloride dosing point is arranged at the liquid surface close to the water inlet side of the coagulation tank, the coagulation tank is provided with a fourth stirrer, the rotation speed of the fourth stirrer is 50-70 rpm, the hydraulic retention time of the reaction tank is 3 minutes, the water after the reaction in the coagulation tank enters the flocculation tank through the overflow pipeline at the bottom of the coagulation tank and is connected with the sludge backflow pipeline of the sedimentation tank, the water after the reaction in the coagulation tank and the backflow sludge enter the flow guide cylinder in the flocculation tank, a polyacrylamide dosing point is arranged in the flow guide cylinder, meanwhile, the flow guide cylinder is provided with a lifting stirrer, the rotation speed of the lifting stirrer is 4-50 rpm, the rotation speed of the lifting stirrer is controlled by a frequency converter, and the rotation speed is adjustable, so that the best flocculation effect is realized, the hydraulic retention time of the reaction tank is 30 minutes, compared with the existing anti-scaling equipment, the total hardness removal effect of the double-alkali process on wastewater is limited, after the scaling ions in the wastewater evaporation treatment process are concentrated by a high multiple, scaling is still formed in the heat exchanger and the process pipeline of the multiple-effect evaporator, and the descaling effect is not good, the drilling wastewater evaporation process anti-scaling equipment increases the phosphate deep hardness removal and the related ammonia-nitrogen removal process on the basis of the double-alkali process, can realize more efficient removal of the scaling ions in the drilling wastewater, reduces the ammonia-nitrogen concentration of the produced water, and after the treatment by the equipment, the total hardness of the drilling wastewater can be reduced from 1200-1500 mg / L to below 20 mg / L, the strontium ion concentration can be reduced from 60-80 mg / L to below 30 mg / L, the ammonia-nitrogen can be reduced from 30-40 mg / L to below 15 mg / L, scaling of the evaporator is effectively reduced, and the ammonia-nitrogen is simultaneously treated. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an overall structure schematic view of the drilling wastewater evaporation process anti-scaling equipment;

[0021] Figure 2The utility model provides a kind of overall structure section view of drilling and production wastewater evaporation process scale prevention equipment;

[0022] Figure 3 The utility model provides a kind of overall structure another view section view of drilling and production wastewater evaporation process scale prevention equipment;

[0023] Figure 4 The utility model provides a kind of water outlet pipeline structure section view of drilling and production wastewater evaporation process scale prevention equipment;

[0024] Figure 5 The utility model provides a kind of inclined pipe device structure diagram of drilling and production wastewater evaporation process scale prevention equipment.

[0025] Legend:

[0026] 1, water inlet pipeline;2, pipeline mixer;3, lye adding device;4, sodium carbonate adding device;5, first primary hard removal reaction chamber;6, first mixer;7, overflow hole;8, second primary hard removal reaction chamber;9, second mixer;10, phosphate adding device;11, secondary hard removal reaction pool;12, third mixer;13, overflow passage;14, coagulation tank;15, PAC adding device;16, fourth mixer;17, overflow pipeline;18, flocculation tank;19, flow guide cylinder;20, PAM adding device;21, lifting mixer;22, inclined pipe sedimentation tank;23, inclined pipe device;24, water outlet weir;25, sludge bucket;26, sludge backflow screw pump;27, sludge backflow pipeline;28, sludge discharge pump;29, sludge discharge pipeline;30, water outlet pipeline;31, water outlet tank;32, first pipeline;33, second pipeline;34, overflow tank;35, supporting leg. DETAILED DESCRIPTION

[0027] Reference Figures 1-5The utility model provides a kind of anti-fouling equipment in drilling wastewater evaporation process: a kind of anti-fouling equipment in drilling wastewater evaporation process, including first primary hard removal reaction chamber 5, the left side surface of first primary hard removal reaction chamber 5 is fixedly connected with water inlet pipeline 1, the outer surface of water inlet pipeline 1 is fixedly connected with pipeline mixer 2, pipeline mixer is as pH value adjusting mixing device, mixer rear end is equipped with on-line pH meter, dosing pump adjusts dosing amount in time according to pH feedback data, outlet water pH value meets set requirement, the outer surface of pipeline mixer 2 is fixedly connected with lye adding device 3, sodium carbonate adding device 4 is provided in the inside of first primary hard removal reaction chamber 5, the right surface of first primary hard removal reaction chamber 5 is fixedly connected with second primary hard removal reaction chamber 8, water inlet pipeline 1 sends water to two primary reaction pools, primary reaction pool is provided 2 reaction chambers, equipment water inlet is arranged in the upper portion of first primary hard removal reaction chamber 5, sodium carbonate dosing point is equipped at water inlet, two reaction pools are equipped with agitator respectively, agitator speed 80~100rpm, the hydraulic retention time of each reaction chamber is 15 minutes, first primary hard removal reaction chamber 5 wastewater passes through bottom overflow hole 7 and enters second primary hard removal reaction chamber 8 and continues to react, overflow hole 7 is opened in the right side wall of first primary hard removal reaction chamber 5, the right side surface of second primary hard removal reaction chamber 8 is fixedly connected with secondary hard removal reaction pool 11, overflow groove 34 is opened in the right side wall of second primary hard removal reaction chamber 8, the water after the reaction of second primary hard removal reaction chamber 8 passes through upper overflow and enters secondary hard removal reaction pool 11, phosphate dosing point is equipped at liquid level at the water inlet side of secondary hard removal reaction pool 11, reaction pool is equipped with third agitator 12, agitator speed 80~100rpm, reaction pool hydraulic retention time 15 minutes, phosphate adding device 10 is provided in the inside of secondary hard removal reaction pool 11, the right side surface of secondary hard removal reaction pool 11 is fixedly connected with coagulation tank 14, secondary hard removal reaction pool bottom passes through flow channel 13 and enters from the upper portion of coagulation tank 14, polyaluminium chloride dosing point is equipped at the liquid level close to water inlet side in coagulation tank 14, fourth agitator 16 is equipped in coagulation tank 14, fourth agitator 16 speed 50~70rpm, reaction pool hydraulic retention time 3 minutes, overflow channel 13 is opened in the right side wall of secondary hard removal reaction pool 11, PAC adding device 15 is provided in the inside of coagulation tank 14, PAC is aluminium chloride, coagulation tank 14 is fixedly connected with flocculation tank 18 on the right side, the water after the reaction of coagulation tank 14 passes through overflow pipeline in coagulation tank 14 bottom and enters flocculation tank, and with sludge backflow pipeline connection of sedimentation tank, the water after the reaction of coagulation tank 14 and backflow sludge are mixed and enter guide cylinder 19 in flocculation tank 18, polyacrylamide dosing point is equipped in guide cylinder 19, and meanwhile guide cylinder interior is matched with lifting agitator 21, lifting agitator 21 speed 4-50rpm, lifting agitator 21 speed is controlled by frequency converter, speed is adjustable, to realize the best flocculation effect, reaction pool hydraulic retention time 30 minutes, the bottom of coagulation tank 14 is fixedly connected with overflow pipeline 17, the other end of overflow pipeline 17 is located in the inside of flocculation tank 18,The inner bottom of the flocculation tank 18 is fixedly connected with a supporting leg 35, the upper surface of the supporting leg 35 is fixedly connected with a flow guide cylinder 19, the inside of the flow guide cylinder 19 is provided with a PAM dosing device 20, and PAM is polyacrylamide.

[0028] The inside of the first primary hardness removal reaction chamber 5 is provided with a first stirrer 6, the inside of the second primary hardness removal reaction chamber 8 is provided with a second stirrer 9, the inside of the secondary hardness removal tank 11 is provided with a third stirrer 12, the inside of the coagulation tank 14 is provided with a fourth stirrer 16, the inside of the flocculation tank 18 is provided with a lifting stirrer 21, the lifting stirrer 21 is located in the inside of the flow guide cylinder 19, the right side of the flocculation tank 18 is provided with an inclined tube sedimentation tank 22, the water after the reaction of the flocculation tank 18 enters the inclined tube sedimentation tank 22, the inclined tube adopts a stainless steel hexagonal inclined tube, the inclined tube sedimentation tank 22 is provided with a hopper 25, and a sludge backflow screw pump 26 and a sludge discharge pump 28 are arranged, the sludge backflow screw pump 26 is selected to be a variable frequency pump to realize adjustable flow rate, the sludge discharge pump 28 is matched with a time controller to realize periodic sludge discharge, the supernatant of the inclined tube sedimentation tank 22 is discharged through a water outlet weir, the front side inner wall of the inclined tube sedimentation tank 22 is fixedly connected with an inclined tube device 23, the front side inner wall of the inclined tube sedimentation tank 22 is fixedly connected with the water outlet weir 24, the number of the water outlet weirs 24 is multiple, the front side of the inclined tube sedimentation tank 22 is provided with water outlet grooves 31, the number of the water outlet grooves 31 is multiple, the front side of the inclined tube sedimentation tank 22 is fixedly connected with water outlet pipelines 30, the water outlet pipelines 30 are in communication with the water outlet grooves 31, the inner bottom of the inclined tube sedimentation tank 22 is fixedly connected with the hopper 25, the number of the hoppers 25 is multiple, the front side of the inclined tube sedimentation tank 22 is fixedly connected with first pipelines 32, the number of the first pipelines 32 is three, the other end of the first pipelines 32 is fixedly connected with second pipelines 33, the right side of the second pipelines 33 is fixedly connected with the sludge discharge pump 28, the right side of the sludge discharge pump 28 is fixedly connected with a sludge discharge pipeline 29, the left side of the second pipelines 33 is fixedly connected with the sludge backflow screw pump 26, the left side of the sludge backflow screw pump 26 is fixedly connected with a sludge backflow pipeline 27, and the other end of the sludge backflow pipeline 27 is fixedly connected in the inside of the overflow pipe 17.

[0029] The total hardness of the produced water of the gas field is 1200±50mg / L, the alkalinity is 1000±100mg / L, the ammonia nitrogen is 30±5mg / L, and the strontium ion concentration is 75±5mg / L, after the treatment of the equipment, the total hardness and the suspended concentration of the effluent are lower than 20mg / L, the strontium ion concentration is lower than 30mg / L, and the ammonia nitrogen concentration is lower than 12mg / L.

[0030] Working principle: The water inlet pipeline 1 transports water to two primary reaction tanks. The primary reaction tank is provided with two reaction chambers. The water inlet of the equipment is provided at the upper part of the first-level hardness removal reaction chamber 5. A sodium carbonate dosing point is provided at the water inlet. A stirrer is provided in each reaction tank. The stirrer speed is 80-100 rpm. The hydraulic retention time of each reaction chamber is 15 minutes. The wastewater from the first-level hardness removal reaction chamber 5 enters the second-level hardness removal reaction chamber 8 through the bottom flow hole 7 to continue the reaction. After the reaction of the second-level hardness removal reaction chamber 8 is completed, the water overflows from the upper part and enters the secondary hardness removal reaction tank 11. A phosphate dosing point is provided at the liquid level on the water inlet side of the secondary hardness removal reaction tank 11. The reaction tank is provided with a third stirrer 12. The stirrer speed is 80-100 rpm. The hydraulic retention time of the reaction tank is 15 minutes. The water enters the coagulation tank 14 from the top through the flow channel 13 at the bottom, and a polyaluminum chloride dosing point is set at the liquid surface near the water inlet side of the coagulation tank 14. A fourth mixer 16 is set in the coagulation tank 14, and the rotation speed of the fourth mixer 16 is 50-70rpm. The hydraulic retention time of the reaction tank is 3 minutes. The water after the reaction in the coagulation tank 14 enters the flocculation tank through the overflow pipe at the bottom of the coagulation tank 14 and is connected with the sludge return line of the sedimentation tank. The water after the reaction in the coagulation tank 14 is mixed with the returned sludge and enters the guide tube 19 in the flocculation tank 18. A polyacrylamide dosing point is set in the guide tube 19. At the same time, a lifting mixer 21 is installed inside the guide tube. The rotation speed of the lifting mixer 21 is 4-50rpm. The rotation speed of the lifting mixer 21 is controlled by the frequency converter and the speed is adjustable to achieve the best flocculation effect. The hydraulic retention time of the reaction tank is 30 minutes.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A scale prevention device for a produced water evaporation process, comprising a first primary hardness removal reaction chamber (5), characterized in that: The left side of the first primary hardening reaction chamber (5) is fixedly connected with a water inlet pipeline (1), the outer surface of the water inlet pipeline (1) is fixedly connected with a pipeline mixer (2), the outer surface of the pipeline mixer (2) is fixedly connected with an alkali liquid adding device (3), the inside of the first primary hardening reaction chamber (5) is provided with a sodium carbonate adding device (4), the right surface of the first primary hardening reaction chamber (5) is fixedly connected with a second primary hardening reaction chamber (8), the right side wall of the first primary hardening reaction chamber (5) is provided with an overflow hole (7), the right side of the second primary hardening reaction chamber (8) is fixedly connected with a secondary hardening reaction tank (11), the right side wall of the second primary hardening reaction chamber (8) is provided with an overflow groove (34), the inside of the secondary hardening reaction tank (11) is provided with a phosphate adding device (10), the right side of the secondary hardening reaction tank (11) is fixedly connected with a coagulation tank (14), the right side wall of the secondary hardening reaction tank (11) is provided with an overflow channel (13), the inside of the coagulation tank (14) is provided with a PAC adding device (15), the right side of the coagulation tank (14) is fixedly connected with a flocculation tank (18), the bottom of the coagulation tank (14) is fixedly connected with an overflow pipeline (17), the other end of the overflow pipeline (17) is located in the inside of the flocculation tank (18), the inner bottom of the flocculation tank (18) is fixedly connected with a supporting leg (35), the upper surface of the supporting leg (35) is fixedly connected with a flow guide cylinder (19), and the inside of the flow guide cylinder (19) is provided with a PAM adding device (20).

2. The scale prevention apparatus for a produced water evaporation process according to claim 1, wherein: The inside of the first primary hardening reaction chamber (5) is provided with a first stirrer (6), the inside of the second primary hardening reaction chamber (8) is provided with a second stirrer (9), the inside of the secondary hardening reaction tank (11) is provided with a third stirrer (12), the inside of the coagulation tank (14) is provided with a fourth stirrer (16), the inside of the flocculation tank (18) is provided with a lifting stirrer (21), and the lifting stirrer (21) is located in the inside of the flow guide cylinder (19).

3. A scale prevention apparatus for a produced water evaporation process according to claim 2, characterized in that: The right side of the flocculation tank (18) is provided with an inclined tube sedimentation tank (22), the front side inner wall of the inclined tube sedimentation tank (22) is fixedly connected with an inclined tube device (23), the front side inner wall of the inclined tube sedimentation tank (22) is fixedly connected with a water outlet weir (24), the number of the water outlet weir (24) is multiple, the front side of the inclined tube sedimentation tank (22) is provided with a water outlet groove (31), the number of the water outlet groove (31) is multiple, the front side of the inclined tube sedimentation tank (22) is fixedly connected with a water outlet pipeline (30), and the water outlet pipeline (30) is communicated with the water outlet groove (31).

4. The scale prevention apparatus for a produced water evaporation process according to claim 3, wherein: The inner bottom of the inclined tube sedimentation tank (22) is fixedly connected with a hopper (25), and the number of the hopper (25) is multiple.

5. The anti-scaling equipment for the evaporation process of drilling wastewater according to claim 4, characterized in that: The front side of the inclined tube sedimentation tank (22) is fixedly connected with a first pipeline (32), the number of the first pipeline (32) is three, and the other end of the first pipeline (32) is fixedly connected with a second pipeline (33).

6. A scale prevention apparatus for a produced water evaporation process according to claim 5, characterized in that: The right side of the second pipeline (33) is fixedly connected with a sludge pump (28), and the right side surface of the sludge pump (28) is fixedly connected with a sludge pipeline (29).

7. A scale prevention apparatus for a produced water evaporation process according to claim 6, characterized in that: The left side surface of the second pipeline (33) is fixedly connected with a sludge backflow screw pump (26), the left side surface of the sludge backflow screw pump (26) is fixedly connected with a sludge backflow pipeline (27), and the other end of the sludge backflow pipeline (27) is fixedly connected in the inside of the overflow pipeline (17).

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