High-temperature and high-pressure saturated water on-line filtering device and overheating steam-injection boiler

Abstract

The invention relates to the technical field of oil field steam injection boilers, in particular to a high-temperature and high-pressure saturated water on-line filtering device and an overheating steam injection boiler, which comprises a filter, a saturated water inlet pipe, a saturated water outlet pipe, an impurity discharge pipe, a saturated water inlet valve, a saturated water outlet valve and an impurity discharge valve, the shell is a cylindrical shell which is through up and down, the top of the shell is fixedly connected with an upper sealing head, the lower part of the shell is fixedly connected with a lower sealing head, the shell, the upper sealing head and the lower sealing head are enclosed to form a closed filtering cavity, a vertically arranged filtering sieve tube of which the lower end extends into the filtering cavity is arranged on the upper sealing head in a penetrating manner, and the lower end of the filtering sieve tube is closed. The device is reasonable in structure, impurities of saturated water discharged by the steam-water separation device can be filtered, so that a downstream pipeline, a valve and a nozzle are effectively prevented from being blocked, the running time rate of the overheating steam-injection boiler is effectively prolonged, and in addition, online pollution discharge and online cleaning can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil field steam injection boilers, in particular to a high-temperature and high-pressure saturated water online filtering device and a superheated steam injection boiler. Background Art

[0002] The superheated steam injection boiler in the oil field is a special equipment for thermal recovery of heavy oil and extra-heavy oil. In the actual operation of the current superheated steam injection boiler, impurities and salt scale on the saturated water outlet pipeline of the steam-water separation device of the boiler often block the valves and pipelines, causing the steam-water separation device and the flow regulating device to malfunction, thereby causing the entire superheated steam injection boiler system to be unable to operate normally. Once the above situation occurs, the superheated steam injection boiler system needs to be shut down, and the pipelines and valves can be inspected and repaired after the water temperature in the furnace drops below 60°C. Not only is the inspection process time-consuming and labor-intensive, but it also greatly reduces the boiler's operating rate. Summary of the invention

[0003] The present invention provides a high-temperature and high-pressure saturated water online filtration device and a superheated steam injection boiler, which overcome the shortcomings of the above-mentioned prior art and can effectively solve the problem that solid impurities carried in the saturated water discharged from the steam-water separation device of the existing superheated steam injection boiler easily lead to blockage of downstream pipelines, valves and nozzles.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a high-temperature and high-pressure saturated water online filtering device and a superheated steam injection boiler, comprising a filter, a saturated water inlet pipe, a saturated water outlet pipe, an impurity discharge pipe, a saturated water inlet valve, a saturated water outlet valve and an impurity discharge valve, the filter comprising a shell, an upper head, a lower head and a filter screen tube, the shell is a cylindrical shell that passes through from top to bottom, the top of the shell is fixedly connected to the upper head, the lower part of the shell is fixedly connected to the lower head, the shell, the upper head and the lower head are enclosed to form a closed filter cavity, the upper head is penetrated by a vertically arranged filter screen tube whose lower end extends into the filter cavity, and the lower end of the filter screen tube is sealed, the tube wall of the filter screen tube corresponding to the internal position of the filter cavity is densely covered with filtering pores, the upper end of the filter screen tube is fixedly connected to the saturated water outlet pipe, the saturated water outlet pipe is provided with a saturated water outlet valve, the lower head is penetrated by a saturated water inlet pipe and an impurity discharge pipe respectively connected to the filter cavity, the saturated water inlet pipe is provided with a saturated water inlet valve, and the impurity discharge pipe is provided with an impurity discharge valve.

[0005] The following is a further optimization and / or improvement of one of the above invention solutions: The above-mentioned high-temperature and high-pressure saturated water online filtration device and superheated steam injection boiler may also include a controller, a first pressure detection device and a second pressure detection device. The first pressure detection device is provided on the saturated water inlet pipe, and the second pressure detection device is provided on the saturated water outlet pipe. The first pressure detection device, the second pressure detection device, the saturated water inlet valve, the saturated water outlet valve and the impurity discharge valve are all connected to the controller.

[0006] The controller mentioned above may be a PLC controller.

[0007] The outlet end of the saturated water inlet pipe can be vertically extended into the filter cavity for a certain distance, the impurity discharge pipe is arranged horizontally, and the inlet end of the impurity discharge pipe is located at the bottom of the filter cavity.

[0008] The above-mentioned saturated water inlet valve, saturated water outlet valve and impurity discharge valve are all manual-automatic integrated valves.

[0009] The second technical solution of the present invention is achieved through the following measures: a superheated steam injection boiler, including a boiler body, a steam-water separation device, a mixer and a high-temperature and high-pressure saturated water online filtration device, a radiation section, a superheating section and a convection section are arranged in the boiler body, the inlet of the steam-water separation device is connected to the outlet of the radiation section, the exhaust port of the steam-water separation device is connected to the inlet of the superheating section, the outlet of the superheating section is connected to the first inlet of the mixer, the inlet of the saturated water inlet pipe is connected to the drain port of the steam-water separation device, and the outlet of the saturated water outlet pipe is connected to the second inlet of the mixer.

[0010] The following is a further optimization and / or improvement of one of the above invention solutions: A flow regulating valve may be provided on the saturated water outlet pipe corresponding to the position between the saturated water outlet valve and the blender.

[0011] The present invention has a reasonable structure and can filter impurities from saturated water discharged from a steam-water separation device, thereby effectively preventing blockage of downstream pipelines, valves and nozzles, effectively extending the operating rate of the superheated steam injection boiler, and can also perform online sewage discharge and online cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0013] Attached Figure 2 It is a schematic diagram of the front cross-sectional structure of the filter in the first embodiment of the present invention.

[0014] Attached Figure 3 This is a circuit block diagram of Embodiment 1 of the present invention.

[0015] Attached Figure 4 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0016] The codes in the attached drawings are: 1 is a saturated water inlet pipe, 2 is a saturated water outlet pipe, 3 is an impurity discharge pipe, 4 is a saturated water inlet valve, 5 is a saturated water outlet valve, 6 is an impurity discharge valve, 7 is a shell, 8 is an upper head, 9 is a lower head, 10 is a filter screen tube, 11 is a filter pore, 12 is a controller, 13 is a first pressure detection device, 14 is a second pressure detection device, 15 is a boiler body, 16 is a steam-water separation device, 17 is a mixer, 18 is a radiation section, 19 is a superheating section, 20 is a convection section, and 21 is a flow control valve. DETAILED DESCRIPTION

[0017] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0018] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0019] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figure 1-3 As shown, the high-temperature and high-pressure saturated water online filtering device includes a filter, a saturated water inlet pipe 1, a saturated water outlet pipe 2, an impurity discharge pipe 3, a saturated water inlet valve 4, a saturated water outlet valve 5 and an impurity discharge valve 6. The filter includes a shell 7, an upper head 8, a lower head 9 and a filter screen 10. The shell 7 is a cylindrical shell 7 that passes through from top to bottom. The upper head 8 is fixedly connected to the top of the shell 7, and the lower head 9 is fixedly connected to the lower part of the shell 7. The shell 7, the upper head 8 and the lower head 9 are enclosed to form a closed filtering chamber. The upper head 8 passes through A vertically arranged filter screen tube 10 is provided, the lower end of which extends into the filter cavity, and the lower end of the filter screen tube 10 is closed. The tube wall of the filter screen tube 10 corresponding to the internal position of the filter cavity is densely covered with filter pores 11. The upper end of the filter screen tube 10 is fixedly connected with a saturated water outlet pipe 2, and the saturated water outlet pipe 2 is provided with a saturated water outlet valve 5. A saturated water inlet pipe 1 and an impurity discharge pipe 3 respectively connected with the filter cavity are penetrated on the lower head 9, the saturated water inlet pipe 1 is provided with a saturated water inlet valve 4, and the impurity discharge pipe 3 is provided with an impurity discharge valve 6.

[0020] When in use, the inlet of the saturated water inlet pipe 1 is connected to the drain port of the steam-water separation device 16 of the superheated steam injection boiler, and the outlet of the saturated water outlet pipe 2 is connected to the second inlet of the mixer 17 of the superheated steam injection boiler. The high-temperature and high-pressure saturated water containing impurities is discharged from the drain port of the steam-water separation device 16 and enters the filter through the saturated water inlet pipe 1. The solid impurities in the high-temperature and high-pressure saturated water are separated by the filter screen 10, and the solid impurities are settled at the bottom of the filter. The filtered saturated water enters the boiler mixing system pipeline through the saturated water outlet pipe 2, thereby realizing the saturated water discharged from the steam-water separation device 16 during the operation of the superheated steam injection boiler. and water to filter impurities, thereby effectively preventing the blockage of downstream pipelines, valves and nozzles, and effectively extending the operating rate of the superheated steam injection boiler; when impurities need to be discharged, the saturated water outlet valve 5 can be closed, and the impurity discharge valve 6 can be opened. The saturated water discharged from the steam-water separation device 16 will discharge the impurities settled in the filter. In addition, the saturated water inlet valve 4 can be closed, the saturated water outlet valve 5 and the impurity discharge valve 6 can be opened, and the high-pressure saturated water in the boiler mixing system pipeline can be used to reversely flush the filter screen tube 10 through the saturated water outlet pipe 2 to clean out the impurities attached to the filter screen tube 10. This not only realizes the discharge of impurities, but also realizes the online cleaning of the filter.

[0021] The above embodiment 1 may be further optimized and / or improved according to actual needs: As attached Figure 1 , 3 As shown, the high-temperature and high-pressure saturated water online filtering device also includes a controller 12, a first pressure detection device 13 and a second pressure detection device 14. The saturated water inlet pipe 1 is provided with a first pressure detection device 13, and the saturated water outlet pipe 2 is provided with a second pressure detection device 14. The first pressure detection device 13, the second pressure detection device 14, the saturated water inlet valve 4, the saturated water outlet valve 5 and the impurity discharge valve 6 are all connected to the controller 12. The pressure at the inlet and outlet ends of the filter is detected by the first pressure detection device 13 and the second pressure detection device 14. When the pressure difference between the two exceeds the set value, the controller 12 controls the saturated water inlet valve 4 to close, and controls the saturated water outlet valve 5 and the impurity discharge valve 6 to open, so as to clean the filter online and ensure the safety of the boiler system operation. Specifically, the controller 12 is a PLC controller.

[0022] As attached Figure 2As shown, the outlet end of the saturated water inlet pipe 1 vertically extends into the filter cavity for a certain distance, the impurity discharge pipe 3 is horizontally arranged, and the inlet end of the impurity discharge pipe 3 is located at the bottom of the filter cavity. The outlet end of the saturated water inlet pipe 1 vertically extends into the filter cavity for a certain distance, so that when the filter is cleaned by high-pressure saturated water in the boiler blending system pipeline, the impurities will not enter the saturated water inlet pipe 1 due to the high position of the outlet end of the saturated water inlet pipe 1, thereby facilitating the complete discharge of the impurities. The certain distance is greater than or equal to 5 cm. Specifically, in this embodiment, the certain distance is 10 cm.

[0023] Specifically, the saturated water inlet valve 4, the saturated water outlet valve 5 and the impurity discharge valve 6 are all manual and automatic integrated valves. Therefore, the saturated water inlet valve 4, the saturated water outlet valve 5 and the impurity discharge valve 6 can be controlled manually and automatically, so that both manual sewage discharge and cleaning can be realized, and automatic sewage discharge and cleaning can be realized.

[0024] Embodiment 2: As shown in the attached Figure 4 As shown, a superheated steam injection boiler includes a boiler body 15, a steam-water separation device 16, a blender 17 and a high-temperature and high-pressure saturated water online filtering device. A radiation section 18, a superheating section 19 and a convection section 20 are arranged in the boiler body 15. The inlet of the steam-water separation device 16 is connected to the outlet of the radiation section 18, the exhaust port of the steam-water separation device 16 is connected to the inlet of the superheating section 19, the outlet of the superheating section 19 is connected to the first inlet of the blender 17, the inlet of the saturated water inlet pipe 1 is connected to the drain port of the steam-water separation device 16, the outlet of the saturated water outlet pipe 2 is connected to the second inlet of the blender 17, and a flow regulating valve 21 is arranged on the saturated water outlet pipe 2 at a position between the saturated water outlet valve 5 and the blender 17.

[0025] Therefore, by setting up a high-temperature and high-pressure saturated water online filtration device, impurities in the saturated water discharged from the steam-water separation device 16 can be filtered and discharged to avoid blockage of downstream pipelines, valves, and nozzles. The filter can also be cleaned online with the saturated water in the mixer 17.

[0026] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best 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 high temperature and high pressure saturated water online filtration device, characterized in that The utility model comprises a filter, a saturated water inlet pipe, a saturated water outlet pipe, an impurity discharge pipe, a saturated water inlet valve, a saturated water outlet valve and an impurity discharge valve. The filter comprises a shell, an upper end cap, a lower end cap and a filter screen tube. The shell is a cylindrical shell which is passed through from top to bottom. The upper end cap is fixedly connected to the top of the shell, and the lower end cap is fixedly connected to the lower part of the shell. A closed filter chamber is formed between the shell, the upper end cap and the lower end cap. A vertically arranged filter screen tube with the lower end extending into the filter chamber is penetrated through the upper end cap, and the lower end of the filter screen tube is sealed. The tube wall of the filter screen tube corresponding to the internal position of the filter chamber is densely covered with filter pores. The upper end of the filter screen tube is fixedly connected to the saturated water outlet pipe, and the saturated water outlet pipe is provided with a saturated water outlet valve. The lower end cap is penetrated with a saturated water inlet pipe and an impurity discharge pipe which are respectively connected to the filter chamber. The saturated water inlet pipe is provided with a saturated water inlet valve, and the impurity discharge pipe is provided with an impurity discharge valve.

2. The high-temperature and high-pressure saturated water online filtration device according to claim 1, characterized in that It also includes a controller, a first pressure detection device and a second pressure detection device. The first pressure detection device is provided on the saturated water inlet pipe, and the second pressure detection device is provided on the saturated water outlet pipe. The first pressure detection device, the second pressure detection device, the saturated water inlet valve, the saturated water outlet valve and the impurity discharge valve are all connected to the controller.

3. The high-temperature and high-pressure saturated water online filtration device according to claim 2, characterized in that The controller is a PLC controller.

4. The high-temperature and high-pressure saturated water online filtration device according to claim 1, 2 or 3, characterized in that The outlet end of the saturated water inlet pipe vertically extends into the filter cavity for a certain distance, the impurity discharge pipe is horizontally arranged, and the inlet end of the impurity discharge pipe is located at the bottom of the filter cavity.

5. The high-temperature and high-pressure saturated water online filtration device according to claim 1, 2 or 3, characterized in that The saturated water inlet valve, saturated water outlet valve and impurity discharge valve are all manual-automatic integrated valves.

6. The high-temperature and high-pressure saturated water online filtration device according to claim 4, characterized in that The saturated water inlet valve, saturated water outlet valve and impurity discharge valve are all manual-automatic integrated valves.

7. A superheated steam injection boiler using the high-temperature and high-pressure saturated water online filtration device according to any one of claims 1 to 6, characterized in that The utility model comprises a boiler body, a steam-water separation device, a mixer and a high-temperature and high-pressure saturated water online filtering device. A radiation section, a superheating section and a convection section are arranged in the boiler body. The inlet of the steam-water separation device is connected to the outlet of the radiation section, the exhaust port of the steam-water separation device is connected to the inlet of the superheating section, the outlet of the superheating section is connected to the first inlet of the mixer, the inlet of the saturated water inlet pipe is connected to the drain port of the steam-water separation device, and the outlet of the saturated water outlet pipe is connected to the second inlet of the mixer.

8. The superheated steam injection boiler according to claim 7, characterized in that A flow regulating valve is provided on the saturated water outlet pipe corresponding to the position between the saturated water outlet valve and the mixer.

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