CN202898076U - Crude oil sewage treatment device - Google Patents

Abstract

The utility model discloses a crude oil sewage treatment plant, which is designed for solving the problem of discharging sewage containing 10-30 micron diameter suspended dirty oil particles, and comprises a water distribution cylinder and a water collection cylinder which are arranged in a settling tank, a sewage pipe connected with the water distribution cylinder, a gas dissolving water pipe and an oil collecting tank, a central mud discharge pipe connected with the water collection cylinder, a drain pipe and a drain pipe, a stop valve, a filter, a flowmeter, a clear water stop valve, a gas dissolving pump, a check valve, a bubble separator, a gas dissolving water pressure reducing valve, a gas dissolving water pipe and the like which are sequentially connected with the drain pipe. The dissolved air pump of the crude oil sewage treatment device sucks clean water in the water collecting cylinder and air in the settling tank to form an air-water dissolved mixture, the air-water dissolved mixture is suddenly released by the spring releaser to generate a large amount of micro bubbles, and the micro bubbles are discharged out of the tank after being adhered with suspended matters or crude oil particles in the oily sewage. The utility model discloses can handle the crude oil sewage that contains 10-30 micron diameter suspension sump oil particles, the treatment effect is good, and is efficient, can reduce crude oil extravagant, satisfies the environmental protection requirement.

Description

Crude oil sewage treatment plant

technical field

The utility model relates to a crude oil sewage treatment device, which belongs to the technical field of crude oil sewage treatment in oilfields.

Background technique

In general, crude oil sewage treatment in oilfields is to put oily sewage into the settlement deoiling tank for preliminary settlement and separation, the crude oil above the oil-water interface overflows through the overflow tank, and the sewage below the oil-water interface is re-injected after settlement, and the sludge is Discharged through the mud discharge pipe at the bottom of the tank, the natural sedimentation method of crude oil sewage treatment generally can only deal with large dirty oil particles with a diameter of more than 50 microns. Because small-diameter dirty oil particles are difficult to settle in a short period of time, suspended dirty oil particles with a diameter of 10-30 microns can only be discharged with sewage, which not only wastes crude oil, but also affects environmental protection.

Contents of the invention

The purpose of the utility model is to provide a crude oil sewage treatment device, which can effectively process crude oil containing suspended dirty oil particles with a diameter of 10-30 microns.

The concrete technical scheme of the utility model is as follows:

The top of the water distribution tube is a conical tube with the expansion opening upward, and the top of the water collection tube is a cone tube with the expansion opening downward. The bottom of the water distribution tube is connected to the water collection tube by screws, and the water collection tube is connected to the bottom of the settling tank.

The water distribution cylinder is connected to the sewage pipe, the dissolved air pipe and the oil collection tank; the sewage pipe is connected to the sewage shut-off valve located outside the tank, and the outlet end of the sewage pipe is located in the lower part of the water distribution cylinder; Spring releaser; the oil collection tank is set on the upper part of the settling tank, and connected to the crude oil shut-off valve set outside the tank.

The water collection tube is connected to the central mud discharge pipe, drain pipe and water outlet pipe; the central mud discharge pipe is connected to the mud discharge stop valve outside the tank; the drain pipe is connected to the siphon breaking pipe on the top of the tank and the pressure reducing valve outside the tank; the outlet pipe Connect the cut-off valve, filter, flow meter, clean water cut-off valve, dissolved air pump, check valve, bubble separator with bubble stop valve, dissolved air water pressure reducing valve and dissolved air water pipe in sequence, and the clean water cut-off The pipeline at the rear end of the valve is connected to the air pipe connected to the top of the tank, and the air pipe is provided with an air shut-off valve and an air flow meter.

The dissolved air pump of this crude oil sewage treatment device sucks the clear water in the water collection tank and the air on the top of the settling tank into the pump to form a dissolved mixture of air and water. After being released suddenly by the spring releaser, a large number of tiny air bubbles are generated to absorb and adhere to the oil. Suspended matter or crude oil in the sewage forms an oil slick layer, which is discharged out of the tank through the oil collection tank. Part of the obtained clean water is used as dissolved air water and part of it is discharged out of the tank. The sludge produced by sewage treatment settles to the bottom of the tank and is regularly discharged out of the tank through the central sludge discharge pipe. The utility model can treat crude oil sewage containing suspended dirty oil particles with a diameter of 10-30 microns, has good treatment effect and high efficiency, can reduce waste of crude oil, and meets environmental protection requirements.

Description of drawings

Figure 1 is a schematic diagram of a crude oil sewage treatment device.

Detailed ways

The embodiment of the utility model is further described with reference to Fig. 1:

Example:

The crude oil sewage treatment device consists of a water distribution cylinder 1, a dissolved air pipe 2, a screw 3, a water collection cylinder 4, a drain pipe 5, a water outlet pipe 6, a central mud discharge pipe 7, a siphon breaking pipe 8, a sewage pipe 9, a spring releaser 10, Oil collection tank 11, crude oil stop valve 12, sewage stop valve 13, sludge discharge stop valve 14, stop valve 15, filter 16, flow meter 17, clean water stop valve 18, dissolved air pump 19, pressure reducing valve 20, check valve 21 , bubble separator 22, bubble stop valve 23, air stop valve 24, air flow meter 25, dissolved air water pressure reducing valve 26, air pipe 27 and settling tank 28 are composed of:

The top of the water distribution cylinder 1 is a cone with an upwardly enlarged diameter, and the top of the water collection cylinder 4 is a cone with an enlarged diameter downward. The bottom of the water distribution cylinder 1 is connected to the water collection cylinder 4 through a screw 3, and the water collection cylinder 4 is arranged on the bottom of the settling tank 28 .

The water distribution cylinder 1 is connected to the sewage pipe 9, the dissolved air water pipe 2 and the oil collection tank 11; the inlet end of the sewage pipe 9 is connected to the sewage stop valve 13 arranged outside the settling tank 28, and the outlet end of the sewage pipe 9 is arranged at the lower part of the water distribution cylinder 1; The water pipe 2 is arranged at the inner bottom of the water distribution cylinder 1, and its outlet end is connected with the spring releaser 10;

The water collecting tube 4 is connected with the central mud discharge pipe 7, the drain pipe 5 and the water outlet pipe 6; the outlet end of the central mud discharge pipe 7 is connected with the mud discharge stop valve 14 arranged outside the settling tank 28; the outlet end of the drain pipe 5 is connected with the settling tank 28 The siphon breaker pipe 8 on the top of the tank and the pressure reducing valve 20 located outside the settling tank 28; the outlet end of the outlet pipe 6 is sequentially connected to the stop valve 15, the filter 16, the flow meter 17, and the clear water stop valve located outside the settling tank 28 18. Dissolved air pump 19, check valve 21, bubble separator 22 with bubble cut-off valve 23, dissolved air water pressure reducing valve 26, dissolved air water pipe 2, clear water cut-off valve 18, the back end pipeline is connected to the air on the top of the tank Pipe 27, the air pipe 27 is connected with the air stop valve 24 and the air flow meter 25.

The working principle of this crude oil sewage treatment device is as follows:

The oily sewage enters the water distribution cylinder 1 through the sewage stop valve 13 and the sewage pipe 9, fully contacts with the microbubble dissolved water released from the spring releaser 10, and the crude oil particles in the sewage are continuously absorbed by the bubbles. The air bubbles adhering to the dirty oil float up to the cone at the top of the water distribution cylinder 1, where the air bubbles are distributed more evenly and the oil-water separation is further strengthened. Then, floating oil enters the oil sump 11, overflows the settling tank 28 by gravity, and is discharged into the crude oil tank through the crude oil shut-off valve 12.

The clean water in the water distribution cylinder 1 flows into the water collection cylinder 4 evenly along the cone at the top of the water collection cylinder 4, and enters the flow meter 17 for measurement through the outlet pipe 6, the shut-off valve 15 and the filter 16, and the clean water shut-off valve 18 is used to control flow and flow Meter overhaul. The tank top air enters the dissolved air pump 19 after the clear water proportioning from the clear water stop valve 18 through the air pipe 27, the air flow meter 25 and the air stop valve 24. Then, the dissolved air water from the dissolved air pump 19 enters the bubble separator 22 through the check valve 21. Here, the bubbles with larger diameters are discharged from the bubble stop valve 23, and the remaining micro-bubble dissolved water passes through the dissolved air water pressure reducing valve 26. , the dissolved air water pipe 2 and the spring releaser 10 enter the water collecting tube 4, and fully contact, mix and absorb with the sewage again.

Simultaneously, the superfluous clear water in the water collection tube 4 is discharged outside the tank by the drain pipe 5 and the clear water shut-off valve 20, and the siphon breaking pipe 8 is used to prevent the clear water siphon from pouring back.

The separated and deposited sludge is discharged from the settling tank 28 through the central sludge discharge pipe 7 and the sludge discharge stop valve 14 .

The technical principle of this crude oil sewage treatment device is as follows:

In natural water bodies, solid suspended particles above 50 microns can sink or surface naturally after standing still for several hours, while suspended particles that are difficult to settle in a short time are mostly between 10 and 30 microns in diameter. Studies have shown that air bubbles smaller in diameter than suspended particles (oil or suspended solids) can effectively adsorb them. The particle diameter of the emulsion is between 0.25 and 2.5 microns, and the microbubbles of about 1 micron have a good adsorption effect on most of the particles. The diameter of the air bubbles coming out of the dissolved air pump of this treatment device is about 30 microns. After the bubble separator removes the larger bubbles, a large number of tiny bubbles of about 1 micron can be generated through the spring releaser, which can meet the requirements for absorbing dirty oil particles.

Claims (1)

1. A crude oil sewage treatment plant, characterized in that: The top of the water distribution cylinder (1) is a conical cylinder with an enlarged diameter opening upward, the top of the water collection cylinder (4) is a cone cylinder with an enlarged diameter opening downward, and the bottom end of the water distribution cylinder (1) is connected to the water collection cylinder (4) by screws (3). The water collection tube (4) is connected to the bottom surface of the settling tank (28); The water distribution cylinder (1) is connected to the sewage pipe (9), the dissolved air water pipe (2) and the oil sump (11); the sewage pipe (9) is connected to the sewage shut-off valve (13) located outside the tank, and the sewage pipe (9) outlet is set In the lower part of the water distribution cylinder (1); the dissolved air pipe (2) is arranged at the inner bottom of the water distribution cylinder (1), and its outlet is connected to the spring releaser (10); the oil collection tank (11) is arranged in the upper part of the settling tank (28), And connect the crude oil shut-off valve (12) that is located outside the tank; The water collection tube (4) connects the central mud discharge pipe (7), drain pipe (5) and outlet pipe (6); the central mud discharge pipe (7) connects with the mud discharge stop valve (14) located outside the tank; the drain pipe ( 5) Connect the siphon breaker pipe (8) located on the top of the tank and the pressure reducing valve (20) outside the tank; the outlet pipe (6) is sequentially connected to the shut-off valve (15), filter (16) and flow rate valve located outside the tank. Meter (17), clear water stop valve (18), dissolved air pump (19), check valve (21), bubble separator (22) with bubble stop valve (23), dissolved air water pressure reducing valve (26) With the dissolved air water pipe (2), the clear water cut-off valve (18) rear end pipeline is connected with the air pipe (27) on the top of the tank, and the air pipe (27) is connected with the air cut-off valve (24) and the air flow meter (25).

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