Mixing water taking device at lower part of overheat steam-injection boiler separator and use method of mixing water taking device

Abstract

The invention relates to the technical field of overheat steam-injection boiler separator lower part mixing water taking, in particular to an overheat steam-injection boiler separator lower part mixing water taking device and a use method thereof. The overheat steam-injection boiler separator lower part mixing water taking device comprises a separator, a mixer, a superheater, a recovery tank and a three-way pipe fitting; saturated water on the lower portion of the separator enters the blender, saturated steam on the upper portion of the separator enters the superheater, supersaturated steam from the superheater and the saturated water from the lower portion of the separator are blended in the blender, and particles and precipitates on the lower portion and the bottom edge of the separator enter the recovery tank to be stored. And the mixed water at the lower part of the separator enters the recovery tank, and the water flowing out of the mixer enters the recovery tank during backwashing. The problem that an electric liquid level adjusting valve, a mixer and a mixing pipeline are frequently scaled and blocked can be solved, and daily overheating production operation of an oil field overheating steam-injection boiler is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of mixing and taking water from the lower part of a hot steam injection boiler separator, and particularly relates to a mixing and taking water device from the lower part of a superheated steam injection boiler separator and a use method thereof. Background Art

[0002] At present, the exploitation of heavy oil is generally carried out by steam injection thermal recovery, especially for super-heavy oil, superheated steam injection is the basic need for exploiting formation oil reservoirs. In the daily production and operation of the superheated steam injection boiler in the oil field, due to the use of soft sewage with high mineralization to enter the superheated steam injection boiler for heating and vaporization, the separator used by the superheated steam injection boiler has only one liquid outlet at the bottom, and the sewage outlet and the mixed water intake are the same inlet. Considering that there are particles and precipitates precipitated from saturated water in the separation water at the bottom of the separator, resulting in poor quality of mixed water, and the mixed water and particles and precipitates are not separated and discharged, most of the particles and precipitates enter the mixed water, causing large particles to block the liquid level control valve of the separator, and smaller particles and precipitates enter the mixer, causing the mixer and its steam outlet to scale. If the steam outlet of the mixer is cut open, it is found that the internal scaling is very serious, and the scaling almost blocks the steam outlet of the mixer.

[0003] Therefore, it is necessary to promptly discover the situation of rising liquid level in the separator caused by frequent blockage of the liquid level control valve of the separator on site, otherwise it will cause water inflow into the superheating section, resulting in burst of the superheater tube, and finally damage to the superheated steam injection boiler equipment. In addition, the problem of high pressure drop in the mixer is frequently shut down, resulting in the shutdown of the superheated steam injection boiler, which ultimately fails to meet the needs of on-site steam injection. However, the unreasonable structure of the water intake of the mixing water at the bottom of the separator used in the existing superheated steam injection boiler is the main reason why the superheated steam injection boiler cannot achieve overheating operation in daily production, the separator liquid level control valve is often blocked, and the pressure drop of the mixer is large, resulting in low operating efficiency of the superheated steam injection boiler and potential safety hazards. Summary of the invention

[0004] The present invention provides a mixing and water intake device for the lower part of a superheated steam injection boiler separator, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of frequent scaling and low operating efficiency of electric liquid level control valves, mixers, and mixing pipelines in daily production and operation of superheated steam injection boilers.

[0005] One of the technical solutions of the present invention is achieved through the following measures: a mixing and water intake device at the lower part of a superheated steam injection boiler separator, comprising a separator, a mixer, a superheater, a recovery tank, and a three-way pipe fitting, wherein a first saturated steam pipeline is fixedly connected to the upper part of the separator, a second saturated steam pipeline is fixedly connected between the top steam outlet of the separator and the top steam inlet of the superheater, a first supersaturated steam pipeline is fixedly connected between the bottom steam outlet of the superheater and the left steam inlet of the mixer, a second supersaturated steam pipeline is fixedly connected to the right steam outlet of the mixer, a mixing water intake assembly is fixedly connected between the bottom liquid outlet of the separator and the top liquid inlet of the three-way pipe fitting, a first mixing water delivery pipeline is fixedly connected between the right liquid outlet of the three-way pipe fitting and the top liquid inlet of the mixer, and a sewage pipeline is fixedly connected between the left liquid outlet of the three-way pipe fitting and the first liquid inlet of the recovery tank.

[0006] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The separator is provided with a liquid level sensor.

[0007] A backwash pipeline is fixedly connected between the first mixed water delivery pipeline and the second liquid inlet of the recovery tank.

[0008] A water baffle is fixedly arranged at the bottom of the separator.

[0009] A mixed water intake pipeline is fixedly installed inside the mixed water intake assembly, and the suction port of the mixed water intake pipeline extends into the separator.

[0010] The suction port of the mixed water intake pipeline is a semi-pointed structure, and the suction port of the mixed water intake pipeline is fixedly arranged at the lower part of the water baffle, and the outer wall of the mixed water intake pipeline outlet is close to the inner wall of the mixed water intake component outlet.

[0011] The outlet of the mixed water intake pipeline is fixedly connected to a mixed water intake elbow pipe fitting, the outer wall of the mixed water intake elbow pipe fitting outlet is fixedly connected to the inner wall of the first mixed water delivery pipeline with a mixed water plugging plate, and the outlet of the mixed water intake elbow pipe fitting is fixedly connected to the second mixed water delivery pipeline.

[0012] A first mixing stop valve is fixedly installed on the first mixing water delivery pipeline between the above-mentioned three-way pipe fitting and the backwash pipeline, an electric liquid level regulating valve and a second mixing stop valve are fixedly installed in sequence on the first mixing water delivery pipeline between the backwash pipeline and the mixer along the medium flow direction, a sewage stop valve and a sewage electric valve are fixedly installed in sequence on the sewage pipeline along the medium flow direction, and a first backwash stop valve and a second backwash stop valve are fixedly installed in sequence on the backwash pipeline along the medium flow direction, wherein the electric liquid level regulating valve and the sewage electric valve are electrically connected to the liquid level sensor.

[0013] The second technical solution of the present invention is achieved through the following measures: a method for using a mixing and water-taking device at the bottom of a superheated steam injection boiler separator, which is carried out according to the following steps: in the first step, after saturated steam enters the separator for gas-liquid separation, saturated water condenses at the bottom of the separator, and most of the particles and precipitates in the saturated water gather at the bottom and bottom edge areas of the separator, while the saturated steam after separation gathers at the upper part of the separator; in the second step, the first mixing stop valve, the electric liquid level regulating valve, the second mixing stop valve, the sewage stop valve, and the sewage electric valve are opened. The saturated water at the bottom of the separator enters the mixed water intake elbow fitting through the mixed water intake pipeline, and is transported to the first mixed water delivery pipeline through the second mixed water delivery pipeline, and then sent to the mixer. The particulate matter and precipitate at the bottom edge of the separator enter the recovery tank for storage through the muddy water intake assembly and the three-way pipe fitting; in the third step, the saturated steam at the top of the separator enters the superheater and is heated into supersaturated steam. The supersaturated steam then enters the mixer and is mixed with the saturated water from the bottom of the separator, and is then sent to the downstream process through the second supersaturated steam pipeline.

[0014] The following is a further optimization and / or improvement of the second technical solution of the above invention: The above also includes regular forward and reverse flushing. During forward flushing, the first blending stop valve, the electric liquid level regulating valve, the first backwashing stop valve, and the second backwashing stop valve are opened, and the second blending stop valve is closed, and the blended water at the bottom of the separator enters the recovery tank at the maximum flow rate. During backwashing, the first blending stop valve is closed, and the second blending stop valve, the electric liquid level regulating valve, the first backwashing stop valve, and the second backwashing stop valve are opened, and the blended water flowing out of the blender enters the recovery tank at the maximum flow rate.

[0015] The invention has a simple and practical structure, strong on-site practicability, simple maintenance operation, low maintenance cost, reduces the frequency of unplanned shutdowns, and ensures superheated operation of the superheated steam injection boiler in daily production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a schematic diagram of the process structure of the present invention.

[0017] Attached Figure 2 For attachment Figure 1 Schematic diagram of the partial cross-sectional structure of the lower mixing water intake of the superheated steam injection boiler separator.

[0018] The codes in the accompanying drawings are: 1 is a separator, 2 is a mixer, 3 is a superheater, 4 is a recovery tank, 5 is a three-way pipe fitting, 6 is a first saturated steam pipeline, 7 is a second saturated steam pipeline, 8 is a first supersaturated steam pipeline, 9 is a second supersaturated steam pipeline, 10 is a mixed water intake assembly, 11 is a first mixed water delivery pipeline, 12 is a sewage pipeline, 13 is a liquid level sensor, 14 is a backwash pipeline, 15 is a water baffle, 16 is a mixed water intake pipeline, 17 is a mixed water intake elbow pipe fitting, 18 is a second mixed water delivery pipeline, 19 is a mixed water blocking plate, 20 is a first mixing stop valve, 21 is an electric liquid level regulating valve, 22 is a second mixing stop valve, 23 is a sewage stop valve, 24 is a sewage electric valve, 25 is a first backwash stop valve, and 26 is a second backwash stop valve. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions. The present invention is further described below in conjunction with the embodiments: Embodiment 1: As attached Figure 1 As shown, the mixing and water-taking device at the lower part of the separator of the superheated steam injection boiler comprises a separator 1, a mixer 2, a superheater 3, a recovery tank 4 and a three-way pipe fitting 5. A first saturated steam pipeline 6 is fixedly connected to the upper part of the separator 1, a second saturated steam pipeline 7 is fixedly connected between the top steam outlet of the separator 1 and the top steam inlet of the superheater 3, a first supersaturated steam pipeline 8 is fixedly connected between the bottom steam outlet of the superheater 3 and the left steam inlet of the mixer 2, a second supersaturated steam pipeline 9 is fixedly connected to the right steam outlet of the mixer 2, a mixing water intake assembly 10 is fixedly connected between the bottom liquid outlet of the separator 1 and the top liquid inlet of the three-way pipe fitting 5, a first mixing water delivery pipeline 11 is fixedly connected between the right liquid outlet of the three-way pipe fitting 5 and the top liquid inlet of the mixer 2, and a sewage pipeline 12 is fixedly connected between the left liquid outlet of the three-way pipe fitting 5 and the first liquid inlet of the recovery tank 4.

[0020] The present invention can realize the corresponding sewage discharge and flushing process flow through the device, realize regular sewage discharge and forward and reverse flushing according to water quality conditions, and timely eliminate precipitated sediment materials in the separator, mixing pipe and sewage pipe to prevent pipeline blockage.

[0021] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a liquid level sensor 13 is provided on the separator 1 .

[0022] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a backwash pipeline 14 is fixedly connected between the first mixed water delivery pipeline 11 and the second liquid inlet of the recovery tank 4 .

[0023] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 2 As shown, a water retaining plate 15 is fixedly arranged at the bottom of the separator 1 .

[0024] The water baffle 15 is fixedly mounted on the bottom of the separator 1 through a bracket.

[0025] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 2 As shown, a mixed water intake pipeline 16 is fixedly installed inside the mixed water intake assembly 10 , and the suction port of the mixed water intake pipeline 16 extends into the separator 1 .

[0026] According to the actual production, the mixed water intake assembly 10 includes a straight pipe and a reducer pipe, which are fixedly connected. The suction port of the mixed water intake pipeline 16 extends into the separator 1, which is convenient for realizing the unique mixed water intake function, separating sewage discharge from mixed water intake, and ensuring the water quality of mixed water intake.

[0027] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 2 As shown, the suction port of the mixed water intake pipeline 16 is a semi-pointed structure, and the suction port of the mixed water intake pipeline 16 is fixedly arranged at the lower part of the water baffle 15, and the outer wall of the outlet of the mixed water intake pipeline 16 is close to the inner wall of the outlet of the mixed water intake assembly 10.

[0028] As required, the suction port of the mixed water intake pipeline 16 is a semi-pointed structure, which can, on the one hand, enable saturated water to enter the mixed water intake pipeline 16 through the suction port of the mixed water intake pipeline 16, and on the other hand, prevent particulate matter and precipitates in the saturated water from entering the intake port and clogging it. The suction port of the mixed water intake pipeline 16 is arranged at the lower part of the water baffle 15, in order to ensure that the water intake position is in a safe and stable area for separating water, which can greatly improve the quality of the mixed water. The outer wall of the outlet of the mixed water intake pipeline 16 is close to the inner wall of the outlet of the mixed water intake assembly 10, so that the cross-section of the sewage outlet in the mixed water intake assembly 10 can be enlarged to facilitate the smooth discharge of large particulate matter and precipitates.

[0029] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 2 As shown, the outlet of the mixed water intake pipeline 16 is fixedly connected to a mixed water intake elbow pipe fitting 17, the outer wall of the outlet of the mixed water intake elbow pipe fitting 17 and the inner wall of the first mixed water delivery pipeline 11 are fixedly connected with a mixed water plugging plate 19, and the outlet of the mixed water intake elbow pipe fitting 17 is fixedly connected to a second mixed water delivery pipeline 18.

[0030] As needed, the mixed water plugging plate 19 is used to install a short section of the mixed water intake elbow pipe 17 to prevent sewage from entering the first mixed water delivery pipeline 11.

[0031] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, a first mixing stop valve 20 is fixedly installed on the first mixing water delivery pipeline 11 between the three-way pipe fitting 5 and the backwash pipeline 14, an electric liquid level regulating valve 21 and a second mixing stop valve 22 are fixedly installed in sequence along the medium flow direction on the first mixing water delivery pipeline 11 between the backwash pipeline 14 and the mixer 2, a sewage stop valve 23 and a sewage electric valve 24 are fixedly installed in sequence along the medium flow direction on the sewage pipeline 12, and a first backwash stop valve 25 and a second backwash stop valve 26 are fixedly installed in sequence along the medium flow direction on the backwash pipeline 14, wherein the electric liquid level regulating valve 21 and the sewage electric valve 24 are both electrically connected to the liquid level sensor 13.

[0032] Embodiment 9: As attached Figure 1 As shown, the method for using the mixing and water-taking device at the lower part of the separator of the superheated steam injection boiler is carried out according to the following steps: in the first step, after the saturated steam enters the separator 1 for gas-liquid separation, the saturated water condenses at the lower part of the separator 1, and most of the particles and precipitates in the saturated water gather at the lower part and the bottom edge area of ​​the separator 1, while the saturated steam after separation gathers at the upper part of the separator 1; in the second step, the first mixing stop valve 20, the electric liquid level regulating valve 21, the second mixing stop valve 22, the sewage stop valve 23, and the sewage electric valve 24 are opened, and the saturated water at the lower part of the separator 1 is passed through the first mixing stop valve 20, the electric liquid level regulating valve 21, the second mixing stop valve 22, the sewage stop valve 23, and the sewage electric valve 24. The mixed water intake pipeline 16 enters the mixed water intake elbow pipe fitting 17, and is transported to the first mixed water delivery pipeline 11 through the second mixed water delivery pipeline 18, and then sent to the mixer 2. The particulate matter and precipitate at the lower part and the bottom edge of the separator 1 enter the recovery tank 4 for storage through the muddy water intake assembly 10 and the three-way pipe fitting 5; in the third step, the saturated steam at the top of the separator 1 enters the superheater 3 and is heated into supersaturated steam. The supersaturated steam then enters the mixer 2 and is mixed with the saturated water from the lower part of the separator 1, and is then sent to the downstream process through the second supersaturated steam pipeline 9.

[0033] Embodiment 10: As attached Figure 1 As shown, the method for using the mixing and water taking device at the lower part of the separator of the superheated steam injection boiler also includes regular forward and reverse flushing. During forward flushing, the first mixing stop valve 20, the electric liquid level regulating valve 21, the first backwashing stop valve 25, and the second backwashing stop valve 26 are opened, and the second mixing stop valve 22 is closed, and the mixed water at the lower part of the separator 1 enters the recovery tank 4 at the maximum flow rate. During backwashing, the first mixing stop valve 20 is closed, and the second mixing stop valve 22, the electric liquid level regulating valve 21, the first backwashing stop valve 25, and the second backwashing stop valve 26 are opened, and the mixed water flowing out of the mixer 2 enters the recovery tank 4 at the maximum flow rate.

[0034] As needed, the superheated steam injection boiler needs to be discharged during normal shutdown or operation, or the discharge frequency can be adjusted according to the daily water mineralization. First open the discharge stop valve 23, then start the discharge electric valve 24 and keep it for 1 minute, or when the minimum liquid level of the separator 1 is reached, immediately close the discharge electric valve 24, and then close the discharge stop valve 23. After closing the discharge stop valve 23, start closing the discharge electric valve 24 to release the pressure of the discharge pipeline 12. During the start-up and shutdown of the discharge process, it is not allowed to cause the liquid level of the separator 1 to be lower than the minimum liquid level, causing the temperature of the blender 2 to rise.

[0035] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0036] As required, the pipelines and equipment of the mixing and water taking device at the lower part of the superheated steam injection boiler separator may be provided with conventional valves, thermometers and pressure gauges known and used in the art according to production needs.

[0037] In summary, the present invention solves the problem of frequent scaling and clogging of electric liquid level control valves, mixers, and mixing pipes, significantly improves the daily production and operation capacity of superheated steam injection boilers, and adapts to the water quality of oil fields to a great extent, thereby realizing safe and efficient operation of superheated steam injection boilers. It also meets the development needs of ultra-heavy oil, has low maintenance costs, reduces the frequency of unplanned shutdowns, and ensures that superheated operation is achieved in daily production of superheated steam injection boilers.

[0038] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A mixing and water taking device for the lower part of the separator of a superheated steam injection boiler, characterized in that It includes a separator, a mixer, a superheater, a recovery tank, and a three-way pipe fitting. The upper part of the separator is fixedly connected with a first saturated steam pipeline, the top steam outlet of the separator and the top steam inlet of the superheater are fixedly connected with a second saturated steam pipeline, the bottom steam outlet of the superheater and the left steam inlet of the mixer are fixedly connected with a first supersaturated steam pipeline, the right steam outlet of the mixer is fixedly connected with a second supersaturated steam pipeline, the bottom liquid outlet of the separator and the top liquid inlet of the three-way pipe fitting are fixedly connected with a mixed water intake component, the right liquid outlet of the three-way pipe fitting and the top liquid inlet of the mixer are fixedly connected with a first mixed water delivery pipeline, and the left liquid outlet of the three-way pipe fitting and the first liquid inlet of the recovery tank are fixedly connected with a sewage pipeline.

2. The lower mixing and water taking device for superheated steam injection boiler separator according to claim 1 is characterized in that A liquid level sensor is provided on the separator.

3. The lower mixing and water taking device for superheated steam injection boiler separator according to claim 1 or 2, characterized in that A backwash pipeline is fixedly connected between the first mixed water delivery pipeline and the second liquid inlet of the recovery tank.

4. The lower mixing and water taking device for superheated steam injection boiler separator according to claim 1, 2 or 3, characterized in that A water baffle is fixedly arranged at the bottom of the separator.

5. The lower mixing and water taking device for superheated steam injection boiler separator according to claim 1, 2, 3 or 4, characterized in that A mixed water intake pipeline is fixedly installed inside the mixed water intake component, and the suction port of the mixed water intake pipeline extends into the interior of the separator.

6. The lower mixing and water taking device for superheated steam injection boiler separator according to claim 5, characterized in that The suction port of the mixed water intake pipeline is a semi-pointed structure, and the suction port of the mixed water intake pipeline is fixedly arranged at the lower part of the water baffle, and the outer wall of the mixed water intake pipeline outlet is close to the inner wall of the mixed water intake component outlet.

7. The lower mixing and water taking device for superheated steam injection boiler separator according to claim 5 or 6, characterized in that The outlet of the mixed water intake pipeline is fixedly connected to a mixed water intake elbow pipe fitting, the outer wall of the mixed water intake elbow pipe fitting outlet is fixedly connected to the inner wall of the first mixed water delivery pipeline with a mixed water plugging plate, and the outlet of the mixed water intake elbow pipe fitting is fixedly connected to the second mixed water delivery pipeline.

8. The mixing and water taking device for the lower part of the separator of the superheated steam injection boiler according to any one of claims 3 to 7, characterized in that the three-way A first mixing stop valve is fixedly installed on the first mixing water delivery pipeline between the pipe fitting and the backwash pipeline, an electric liquid level regulating valve and a second mixing stop valve are fixedly installed in sequence along the medium flow direction on the first mixing water delivery pipeline between the backwash pipeline and the mixer, a sewage stop valve and a sewage electric valve are fixedly installed in sequence along the medium flow direction on the sewage pipeline, and a first backwash stop valve and a second backwash stop valve are fixedly installed in sequence on the backwash pipeline along the medium flow direction, wherein the electric liquid level regulating valve and the sewage electric valve are electrically connected to the liquid level sensor.

9. A method for using the lower mixing and water taking device for a superheated steam injection boiler separator according to any one of claims 1 to 8, characterized in that The following steps are followed: in the first step, after the saturated steam enters the separator for gas-liquid separation, the saturated water condenses at the bottom of the separator, and most of the particulate matter and precipitates in the saturated water gather in the lower and bottom edge areas of the separator, while the saturated steam after separation gathers in the upper part of the separator; in the second step, the first mixing stop valve, the electric liquid level regulating valve, the second mixing stop valve, the sewage stop valve, and the sewage electric valve are opened, and the saturated water at the bottom of the separator enters the mixing water intake elbow pipe fitting through the mixing water intake pipeline, and is transported to the first mixing water delivery pipeline through the second mixing water delivery pipeline, and then sent to the mixer, and the particulate matter and precipitates at the lower and bottom edges of the separator enter the recovery tank for storage through the muddy water intake assembly and the three-way pipe fitting; in the third step, the saturated steam at the upper part of the separator enters the superheater to be heated into supersaturated steam, and the supersaturated steam then enters the mixer to be mixed with the saturated water from the lower part of the separator, and is then sent to the downstream process through the second supersaturated steam pipeline.

10. The method for using the lower mixing and water taking device of the superheated steam injection boiler separator according to claim 9, characterized in that It also includes regular forward and reverse flushing. During forward flushing, the first mixing stop valve, the electric liquid level regulating valve, the first backwash stop valve, and the second backwash stop valve are opened, and the second mixing stop valve is closed, and the mixed water at the bottom of the separator enters the recovery tank at the maximum flow rate. During backwashing, the first mixing stop valve is closed, and the second mixing stop valve, the electric liquid level regulating valve, the first backwash stop valve, and the second backwash stop valve are opened, and the mixed water flowing out of the mixer enters the recovery tank at the maximum flow rate.

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