Flue gas condensation heat deep recovery device for oil field heating furnace

Abstract

The utility model relates to the technical field of oil field heating furnaces, in particular to a flue gas condensation heat deep recovery device for an oil field heating furnace, which comprises a heat exchange unit, a cleaning unit, a recovery unit and a control system, the heat exchange unit, the cleaning unit, the recovery unit and the control system are integrated in a skid-mounted mode. The heat exchange unit comprises a U-shaped box with an upward port, the U-shaped box is arranged on the frame support through a support, and a smoke inlet flange and a smoke outlet flange are arranged at the two ends of the U-shaped box respectively. When the flue gas condensation heat deep recovery device for the oil field heating furnace is used, the heat exchange unit adopts a plate heat exchanger and is composed of a series of heat exchange plates arranged in parallel, narrow channels are formed between the plates, flue gas and cooling water flow in the adjacent channels respectively, and heat exchange is achieved through the heat conduction effect of the heat exchange plates.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield heating furnaces, in particular to a flue gas condensation heat depth recovery device for oilfield heating furnaces. Background Art

[0002] In the gathering and transportation process of crude oil extraction, heating crude oil and oily wastewater is a critical step to ensure the smooth operation of subsequent transportation, sedimentation, separation, dehydration, water blending, hot washing, and initial crude oil processing. This heating process primarily relies on heating furnaces, which typically use natural gas associated with the oilfield as fuel. When natural gas is burned, it releases a large amount of chemical heat energy, forming high-temperature flue gases. After heating the liquid medium, these gases cool down and are ultimately discharged into the atmosphere through the chimney. These oilfield heating furnaces are widely used in major oilfield production plants.

[0003] However, the exhaust temperature of traditional heating furnaces generally ranges from 100 to 400 degrees Celsius. Flue gas within this temperature range not only carries a large amount of heat energy, but also contains approximately 17% water vapor, a large amount of carbon dioxide, and small amounts of sulfur oxides and nitrogen oxides. These emissions of heat and harmful substances not only cause thermal pollution and reduce air quality, but also result in significant energy waste and increase oil production costs.

[0004] Even more serious is that as the flue gas is discharged through the chimney, some of it cools and condenses on the chimney's inner wall. This condensed water then flows down the chimney's inner wall and is discharged through the smokebox drain pipe. The condensed water accumulates around the heating furnace, forming a thick layer of ice in winter and turning the ground into muddy ground during the off-season. This not only increases the difficulty for on-site operators but also seriously affects the station's internal environment, causing numerous problems for grassroots oil production stations.

[0005] To address this common problem in the oil production sector, particularly the severe challenge of frozen ground in winter, sites often resort to emergency measures such as increasing gas flow and raising exhaust temperatures to maintain production. However, this approach not only fails to fundamentally address the problem but also further exacerbates production energy consumption, lacking technical and economic viability and sustainability. Furthermore, given the often dirty media in oilfields, traditional waste heat recovery devices are prone to clogging, impacting operational efficiency and effectiveness. Utility Model Content

[0006] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose a deep recovery device for flue gas condensation heat used in oil field heating furnaces.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a device for recovering the condensation heat of flue gas from an oilfield heating furnace is designed, which includes a heat exchange unit, a cleaning unit, a recovery unit, and a control system. The recovery unit, the cleaning unit, and the control system are all installed on the heat exchange unit, and the heat exchange unit, the cleaning unit, the recovery unit, and the control system are integrated in a skid-mounted form;

[0008] The heat exchange unit includes a U-shaped box with the port facing upward. The U-shaped box is supported by a frame through a bracket. A smoke inlet flange and a smoke outlet flange are provided at both ends of the U-shaped box. A plurality of stacked heat exchange plates are provided at each end of the U-shaped box. The heat exchange plates are vertically arranged in the U-shaped box, and the sides of two adjacent heat exchange plates are connected by a connecting plate. A plurality of fins are arranged at intervals on the outside of the heat exchange plates to form channels between the heat exchange plates.

[0009] The recovery unit includes a condensate water tank, which is arranged at the bottom of the U-shaped box and connected to the U-shaped box through a conduit. A condensate water pump is provided on one side of the bottom of the condensate water tank. The inlet end of the condensate water pump is connected to the condensate water tank, and a condensate pipeline is installed on the outlet end of the condensate water pump. The other end of the condensate pipeline is connected to the liquid inlet pipe. One end of the liquid inlet pipe is connected to the liquid inlet flange and the other end is connected to the side of the U-shaped box close to the smoke outlet flange. The liquid inlet pipe corresponds to the stacked heat exchange plates.

[0010] The recovery unit also includes a liquid outlet pipe, a liquid outlet flange is installed at one end of the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the side of the U-shaped box close to the smoke inlet flange, and the port of the liquid outlet pipe corresponds to the stacked heat exchange plates.

[0011] Preferably, the control system includes a control cabinet, a controller is provided in the control cabinet, and a display and control buttons are provided on the side of the control cabinet, and the display, control buttons and condensate pump are respectively connected to the controller through wires.

[0012] Preferably, the liquid inlet pipe and the liquid outlet pipe are connected via a bypass pipe, and electric switch valves are installed on the bypass pipe, the liquid inlet pipe and the liquid outlet pipe, and the electric switch valves are connected to the controller via wires.

[0013] Preferably, a liquid level meter is installed on the condensation water tank, and the liquid level meter is connected to the controller via a wire.

[0014] Preferably, pressure gauges and thermometers are installed on the tops of the liquid inlet pipe, the liquid outlet pipe and both sides of the U-shaped box, and the pressure gauges and thermometers are connected to the controller through wires respectively.

[0015] Preferably, an electromagnetic flowmeter is also installed on the liquid outlet pipe.

[0016] Preferably, the cleaning unit comprises a plurality of scrapers arranged on the heat exchange plate, and the scrapers are connected to each other through a transmission shaft and a transmission gear;

[0017] The cleaning unit also includes a driving motor. A driving wheel is coaxially mounted on the driving motor and the transmission gear through a rotating shaft. Belts are mounted on the two transmission wheels. The driving motor is connected to the controller through a wire.

[0018] Preferably, staggered flue gas spoilers are provided in the U-shaped box to change the flow direction and speed of the flue gas and enhance the heat transfer effect.

[0019] The design scheme proposed by the utility model has the following beneficial effects during application:

[0020] 1. The deep recovery device of flue gas condensation heat for oilfield heating furnace removes dirt attached to the heat exchange plates through the reciprocating movement of the scraper between the heat exchange plates, and cleans the oil-water channel, reducing the accumulation of scale and disturbing the water flow, thereby enhancing the heat transfer effect.

[0021] 2. The deep recovery device of flue gas condensation heat for oilfield heating furnace uses condensed water to flow between the heat exchange plates, allowing the condensed water to act as a scale inhibitor between the heat exchange plates to flush the cleaned dirt and effectively prevent scaling problems during the heat exchange process.

[0022] 3. The flue gas condensation heat deep recovery device for the oilfield heating furnace is connected to the condensation water tank through the opening at the lower end of the flue gas side, which can efficiently collect the condensed water in the flue gas and avoid waste of water resources.

[0023] 4. The deep recovery device of flue gas condensation heat for oilfield heating furnace adopts plate heat exchanger through the heat exchange unit. It is composed of a series of parallel arranged heat exchange plates. Narrow channels are formed between the plates, allowing flue gas and cooling water to flow in adjacent channels respectively, and heat exchange is achieved through the heat conduction of the heat exchange plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the main view of the utility model;

[0025] Figure 2 This is the side view of the utility model Figure 1 ;

[0026] Figure 3 This is the side view of the utility model Figure 2 ;

[0027] Figure 4 It is a top view of the utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0029] Figure 6 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0030] Figure 7 This is a schematic diagram of the heat exchange plate structure of the utility model;

[0031] Figure 8 This is a schematic diagram of the scraper structure of the utility model;

[0032] Figure 9 This is a schematic diagram of the transmission gear structure of the utility model;

[0033] Figure 10 This is a schematic diagram of the scraper installation of the present invention.

[0034] In the figure: 1. Heat exchange plate; 2. Fin; 3. Liquid inlet flange; 4. Liquid outlet flange; 5. Smoke inlet flange; 6. Smoke outlet flange; 7. Liquid inlet pipe; 8. Liquid outlet pipe; 9. Bypass pipe; 10. Frame support; 11. Control cabinet; 12. Condensate tank; 13. Liquid level meter; 14. Condensate pump; 15. Condensate pipeline; 16. Drive motor; 17. Belt; 18. Drive pulley; 19. Drive gear; 20. Drive shaft; 21. Scraper; 22. Pressure gauge; 23. Thermometer; 24. Electric on / off valve; 25. Connecting plate; 26. Electromagnetic flowmeter. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Reference Figures 1-10 A deep recovery device for flue gas condensation heat used in oilfield heating furnaces includes a heat exchange unit, a cleaning unit, a recovery unit, and a control system. The recovery unit, cleaning unit, and control system are all installed on the heat exchange unit, and the heat exchange unit, cleaning unit, recovery unit, and control system are integrated in a skid-mounted form. During the production and processing of the device, the heat exchange unit, cleaning unit, recovery unit, control system and other components are integrated in a skid-mounted form in the factory. During on-site installation, only the pipeline system needs to be connected, which greatly shortens the on-site installation period.

[0037] The heat exchange unit includes a U-shaped box with the port upwardly arranged, and the U-shaped box is arranged on a frame support 10 through a bracket. A smoke inlet flange 5 and a smoke outlet flange 6 are respectively provided at both ends of the U-shaped box. A plurality of stacked heat exchange plates 1 are provided in the ends of the U-shaped box. The heat exchange plates 1 are vertically arranged in the U-shaped box, and the sides of the adjacent two heat exchange plates 1 are connected by a connecting plate 25. A plurality of spaced fins 2 are provided on the outside of the heat exchange plates 1. The fins 2 increase the distance between the flue gas and the heat exchange plates 1. heat exchange area, and multiple narrow channels are formed between the heat exchange plates 1; when in use, the smoke inlet flange 5 is connected to the external chimney, and the smoke outlet flange 6 is connected to the exhaust chimney, so that the smoke enters the U-shaped box from the smoke inlet flange 5, and then flows in the channel of the heat exchange plate 1. After the heat is dissipated by the heat exchange plate 1 and the fin 2, it is discharged from the smoke outlet flange 6; and in the process of heat exchange, staggered smoke spoilers are provided in the U-shaped box to change the flow direction and speed of the smoke and enhance the heat transfer effect.

[0038] The recovery unit includes a condensate tank 12, which is arranged at the bottom of the U-shaped box and is connected to the U-shaped box through a conduit. The condensate can flow naturally from the U-shaped box into the condensate tank 12 by gravity, which can efficiently collect the condensate in the flue gas and avoid wasting water resources. A liquid level meter 13 is installed on the condensate tank 12. When the liquid level meter 13 detects that the water level reaches a preset upper limit, a condensate pump 14 is provided on one side of the bottom of the condensate tank 12. The inlet end of the condensate pump 14 is connected to the condensate tank 12, and the outlet end of the condensate pump 14 is connected to the condensate tank 12. A condensation pipe 15 is installed, and the other end of the condensation pipe 15 is connected to the liquid inlet pipe 7. One end of the liquid inlet pipe 7 is connected to the liquid inlet flange 3 and the other end is connected to the side of the U-shaped box near the smoke outlet flange 6. The liquid inlet pipe 7 corresponds to the stacked heat exchange plates 1. The condensate pump 14 will be triggered and started immediately to send the condensate in the condensate tank 12 from the condensation pipe 15 into the liquid inlet pipe 7, and finally flow into the heat exchange plate 1 of the U-shaped box, thereby acting as a scale inhibitor on the heat exchange plate 1, effectively preventing scaling problems during the heat exchange process;

[0039] The recovery unit also includes a liquid outlet pipe 8, at one end of which a liquid outlet flange 4 is installed, and the other end of the liquid outlet pipe 8 is connected to the side of the U-shaped box close to the smoke inlet flange 5, and the port of the liquid outlet pipe 8 corresponds to the stacked heat exchange plate 1. During actual use, the liquid outlet flange 4 and the liquid inlet flange 3 are both connected to the external pipe, which can transport the liquid into the liquid inlet pipe 7 to reach the channel inside the heat exchange plate 1 for flow, and finally flow out from the liquid outlet pipe 8.

[0040] It should be noted that pressure gauges 22 and thermometers 23 are installed on the top of the liquid inlet pipe 7, the liquid outlet pipe 8 and both sides of the U-shaped box to monitor the temperature and pressure of the inlet and outlet liquids, as well as the temperature and pressure of the flue gas in the U-shaped box.

[0041] Furthermore, the liquid inlet pipe 7 and the liquid outlet pipe 8 are connected by a bypass pipe 9. When the equipment fails, the liquid inlet pipe 7 and the flue gas inlet are closed, and the bypass pipe 9 is opened, so that the operating state of the entire equipment is switched to the original non-energy-saving state without affecting production.

[0042] During heat exchange, a cleaning unit is also used to clean the heat exchange plate 1. The cleaning unit includes several scrapers 21 arranged on the heat exchange plate 1. The scrapers 21 are interconnected through a drive shaft 20 and a drive gear 19; the cleaning unit also includes a drive motor 16. A drive wheel 18 is coaxially installed on the drive motor 16 and the drive gear 19 through a rotating shaft. Belts 17 are installed on the two drive wheels 18. The drive motor 16 is connected to the controller through a wire. Driven by the drive motor 16, the scrapers 21 move back and forth in the channel between the heat exchange plates 1, thereby cleaning the dirt on the heat exchange plate 1, reducing scale accumulation and disturbing the water flow, thereby enhancing the heat transfer effect.

[0043] Specifically, the control system includes a control cabinet 11, in which a controller is installed. A display and control buttons are provided on the side of the control cabinet 11. The display, control buttons, condensate pump 14, liquid level meter 13, electric switch valve 24, pressure gauge 22, and thermometer 23 are connected to the controller via wires. In actual use, the controller is one of a PLC logic controller, a control host, and a control mainboard. The controller adopts advanced control algorithms and strategies, such as PID control and fuzzy control, to improve control accuracy and response speed.

[0044] Under the condition of real-time monitoring of key parameters such as flue gas temperature, condensate recovery volume, heat exchange inlet and outlet temperatures, the working status of the heat exchange process can be intelligently and automatically adjusted according to the real-time monitoring data, such as adjusting the flue gas flow rate, condensate flow rate, etc., to ensure that the device is always in the best operating state.

[0045] It should be noted that a wireless signal receiver is also provided in the control cabinet 11. The wireless signal receiver is connected to the controller through a wire and can be connected to mobile phones, tablet computers and other devices through wireless signals, thereby realizing remote monitoring of the device. Users can view the operating status and data of the device in real time through mobile phones, computers and other terminal devices; among them, the remote monitoring platform adopts cloud computing, big data and other technologies to realize real-time transmission, storage and analysis of data.

[0046] It should be further explained that the heat exchange plates 1, condensate tank 12, pipes, etc. in the device are all made of corrosion-resistant and high-temperature resistant materials, such as ND steel; these materials have excellent corrosion resistance and high-temperature resistance, and can ensure long-term and stable operation of the device in harsh environments.

[0047] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for recovering the condensed heat of flue gas from an oilfield heating furnace, characterized by: It includes a heat exchange unit, a cleaning unit, a recovery unit, and a control system. The recovery unit, the cleaning unit, and the control system are all installed on the heat exchange unit, and the heat exchange unit, the cleaning unit, the recovery unit, and the control system are integrated in a skid-mounted form; The heat exchange unit comprises a U-shaped box with an upwardly disposed port, the U-shaped box being disposed on a frame support (10) through a bracket, a smoke inlet flange (5) and a smoke outlet flange (6) being disposed at both ends of the U-shaped box, a plurality of stacked heat exchange plates (1) being disposed in the ends of the U-shaped box, the heat exchange plates (1) being vertically disposed in the U-shaped box, and the sides of two adjacent heat exchange plates (1) being connected by a connecting plate (25), and a plurality of spaced fins (2) being disposed on the outer sides of the heat exchange plates (1) so as to form channels between the heat exchange plates (1); The recovery unit includes a condensate tank (12), which is arranged at the bottom of the U-shaped box and connected to the U-shaped box through a conduit. A condensate pump (14) is provided on one side of the bottom of the condensate tank (12). The inlet end of the condensate pump (14) is connected to the condensate tank (12), and a condensate pipeline (15) is installed on the outlet end of the condensate pump (14). The other end of the condensate pipeline (15) is connected to the liquid inlet pipeline (7). One end of the liquid inlet pipeline (7) is connected to the liquid inlet flange (3) and the other end is connected to the side of the U-shaped box close to the smoke outlet flange (6), and the liquid inlet pipeline (7) corresponds to the stacked heat exchange plates (1). It also includes a liquid outlet pipe (8), a liquid outlet flange (4) is installed at one end of the liquid outlet pipe (8), and the other end of the liquid outlet pipe (8) is connected to the side of the U-shaped box close to the smoke inlet flange (5), and the port of the liquid outlet pipe (8) corresponds to the stacked heat exchange plates (1).

2. The device for recovering the flue gas condensation heat from an oilfield heating furnace according to claim 1, characterized in that: The control system comprises a control cabinet (11), a controller is arranged in the control cabinet (11), and a display and control buttons are arranged on the side of the control cabinet (11), and the display, control buttons and condensate pump (14) are respectively connected to the controller through wires.

3. The device for recovering the condensed heat of flue gas from an oilfield heating furnace according to claim 2, characterized in that: The liquid inlet pipe (7) and the liquid outlet pipe (8) are connected via a bypass pipe (9), and electric switch valves (24) are installed on the bypass pipe (9), the liquid inlet pipe (7), and the liquid outlet pipe (8). The electric switch valves (24) are connected to a controller via a wire.

4. The device for recovering the condensed heat of flue gas from an oilfield heating furnace according to claim 2, characterized in that: A liquid level meter (13) is installed on the condensation water tank (12), and the liquid level meter (13) is connected to the controller via a wire.

5. The device for recovering the condensed heat of flue gas from an oilfield heating furnace according to claim 2, characterized in that: Pressure gauges (22) and thermometers (23) are installed on the tops of the liquid inlet pipe (7), the liquid outlet pipe (8) and both sides of the U-shaped box. The pressure gauges (22) and the thermometers (23) are connected to the controller via wires.

6. The device for recovering the deep heat of flue gas condensation from an oilfield heating furnace according to claim 2, characterized in that: An electromagnetic flow meter (26) is also installed on the liquid outlet pipe (8).

7. The device for recovering deep heat from flue gas condensation of an oilfield heating furnace according to claim 2, characterized in that: The cleaning unit comprises a plurality of scrapers (21) arranged on the heat exchange plate (1), and the scrapers (21) are connected to each other through a transmission shaft (20) and a transmission gear (19); The invention also comprises a driving motor (16), a driving wheel (18) being coaxially mounted on the driving motor (16) and the transmission gear (19) via a rotating shaft, a belt (17) being mounted on the two transmission wheels (18), and the driving motor (16) being connected to the controller via a wire.

8. The device for recovering deep flue gas condensation heat from an oilfield heating furnace according to claim 1, characterized in that: Staggered flue gas spoilers are arranged in the U-shaped box to change the flow direction and speed of the flue gas and enhance the heat transfer effect.

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