Oilfield heating furnace flue gas comprehensive treatment device

Abstract

The utility model discloses an oil field heating furnace flue gas comprehensive treatment device which comprises a flue gas waste heat recovery unit, a heat energy upgrading unit, a boiler water preheating unit and a flue gas condensate water recovery unit, and all the units are connected through pipelines and pump bodies and are integrated in a skid-mounted structure. According to the comprehensive flue gas treatment device for the oil field heating furnaces, through the synergistic effect of the flue gas waste heat recovery unit, the heat energy upgrading unit and the furnace water preheating unit, high-temperature flue gas waste heat of the multiple heating furnaces is deeply recovered, the flue gas exhaust temperature can be reduced to 30 DEG C or below, and the energy utilization efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of heating furnace technology, specifically to a comprehensive treatment device for flue gas from an oilfield heating furnace. Background Technology

[0002] In crude oil extraction, the crude oil gathering and transportation process requires heating the crude oil and oily wastewater to the required temperature to facilitate subsequent transportation, sedimentation, separation, dehydration, water mixing, hot washing, and initial processing of the crude oil. The heating process mainly uses heating furnaces, which primarily use natural gas as fuel. The combustion of the fuel releases a large amount of heat energy and produces high-temperature flue gas. The high-temperature flue gas heats the liquid medium and is then discharged through a chimney. This type of oilfield heating furnace is widely used in various oilfield production plants.

[0003] The flue gas temperature of oilfield heating furnaces is usually in the range of 100-400℃. The flue gas temperature is high and contains a lot of heat energy. Directly releasing the flue gas into the atmosphere will not only waste heat energy and increase the consumption of natural gas and the cost of oil extraction, but also cause certain thermal pollution to the environment and reduce the quality of the environment.

[0004] This is a common phenomenon in various oilfield sectors. To improve the current situation of energy waste, oilfields typically use the method of adding economizers to recover waste heat from flue gas. This involves installing a flue gas-water heat exchanger on each heater to recover waste heat from the flue gas and use it to preheat the heater's feed water. While this method can recover some waste heat from the flue gas, a large amount of latent heat within the flue gas remains unrecovered, resulting in significant heat energy waste and failing to achieve fundamental energy conservation and emission reduction effects. Furthermore, adding an economizer to each heater involves a large amount of engineering work, a long construction period, and high project costs, making it economically inefficient. Therefore, it is necessary to propose a comprehensive flue gas treatment device for oilfield heaters to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by providing a comprehensive treatment device for flue gas from oilfield heating furnaces, thereby solving the problem of significant heat energy waste that still exists in existing technologies.

[0006] This utility model discloses a comprehensive flue gas treatment device for oilfield heating furnaces, comprising a flue gas waste heat recovery unit, a heat energy upgrading unit, a boiler water preheating unit, and a flue gas condensate recovery unit. Each unit is connected via pipes and pumps and integrated within a skid-mounted structure. The flue gas waste heat recovery unit includes a deep flue gas condensate heat recovery device. Its flue gas inlet is connected to the flue gas outlets of multiple heating furnaces via a flue, and its flue gas outlet is connected to a chimney. The water inlet of the deep flue gas condensate heat recovery device is connected to the outlet of a waste hot water circulation pump via a pipe, and its water outlet is connected to the waste hot water inlet of an intelligent high-efficiency heat pump in the heat energy upgrading unit via a pipe. The flue gas condensate outlet of the deep flue gas condensate heat recovery device is connected to the condensate tank of the flue gas condensate recovery unit via a pipe. The heat energy upgrading unit includes an intelligent high-efficiency heat pump. Its remaining hot water outlet is connected to the inlet of a waste hot water circulation pump via a pipe, its hot water inlet is connected to the outlet of a hot water circulation pump via a pipe, and its hot water outlet is connected to the hot water inlet of an anti-clogging plate heat exchanger in the boiler water preheating unit via a pipe. The boiler water preheating unit includes an anti-clogging plate heat exchanger. Its boiler water inlet is connected to the incoming liquid header via a pipe, its boiler water outlet is connected to the inlet of the heating furnace via a pipe, and its hot water outlet is connected to the inlet of the hot water circulation pump via a pipe. The flue gas condensate recovery unit includes a condensate tank and a condensate pump. The outlet of the condensate tank is connected to the inlet of the condensate pump via a pipe, and the outlet of the condensate pump is connected to the inlet of the heating furnace via a pipe.

[0007] Furthermore, a check valve is installed on the condensate pipeline of the flue gas condensate recovery unit.

[0008] Furthermore, the condensate tank is equipped with a level gauge, which is interlocked with the condensate pump for control.

[0009] Furthermore, a pressure gauge is installed at the flue gas outlet near the heating furnace on the flue.

[0010] Furthermore, the boiler water inlet and outlet pipes of the anti-clogging plate heat exchanger are equipped with an electric shut-off valve.

[0011] Furthermore, an electric shut-off valve 2 is provided on the flue gas outlet duct of the heating furnace.

[0012] Furthermore, the heat exchange element of the flue gas condensation heat deep recovery device is a finned heat exchange tube, with the outer side of the finned heat exchange tube serving as the flue gas passage and the inner side serving as the waste water passage.

[0013] Furthermore, the intelligent high-efficiency heat pump includes an evaporator, a compressor, a condenser, and an expansion valve. The evaporator inlet and outlet are connected to the inlet and outlet of the flue gas condensation heat deep recovery device, respectively, and the condenser inlet and outlet are connected to the hot water inlet and outlet of the anti-clogging plate heat exchanger, respectively.

[0014] The beneficial effects of this utility model are as follows: Through the synergistic effect of the flue gas waste heat recovery unit, the heat energy upgrading unit, and the boiler water preheating unit, the high-temperature flue gas waste heat of multiple heating furnaces is deeply recovered, and the exhaust gas temperature can be reduced to below 30℃, significantly improving energy utilization efficiency; all flue gas condensate is recovered and reused as a boiler water scale inhibitor, effectively alleviating the problem of furnace tube scaling, reducing nitrogen oxide emissions and flue gas moisture content, and reducing environmental pollution; the skid-mounted integrated design facilitates on-site installation and construction, reducing project costs and time; the combination of anti-clogging plate heat exchangers, intelligent heat pumps, flue gas condensate heat deep recovery devices, and interlocking control systems ensures the stability and safety of the device operation, achieving the goal of comprehensive treatment of oilfield heating furnace flue gas. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the comprehensive treatment device for flue gas from an oilfield heating furnace according to this utility model.

[0017] Figure 2 This is a three-dimensional structural schematic diagram of the comprehensive treatment device for flue gas from an oilfield heating furnace according to this utility model.

[0018] Diagram description: 1-Anti-clogging plate heat exchanger; 2-Hot water circulation pump; 3-Intelligent high-efficiency heat pump; 4-Waste hot water circulation pump; 5-Flue gas condensation heat deep recovery device; 6-Check valve; 7-Condensate pump; 8-Condensate tank; 9-Heating furnace; 10-Level gauge; 11-Burner; 12-Electric shut-off valve one; 13-Electric shut-off valve two; 14-Barometer. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0021] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions has been enlarged, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0022] Please see Figure 1 and Figure 2 This utility model provides a comprehensive treatment device for flue gas from an oilfield heating furnace, which mainly consists of a flue gas waste heat recovery unit, a heat energy upgrading unit, a furnace water preheating unit, and a flue gas condensate recovery unit. Each unit is equipped with inlets and outlets for multiple media.

[0023] The main equipment of the flue gas waste heat recovery unit is the flue gas condensation heat recovery device 5. The heat exchange element of the flue gas condensation heat recovery device 5 adopts finned heat exchange tubes. Flue gas flows outside the heat exchange tubes, and waste water flows inside the heat exchange tubes. The flue gas inlet of the flue gas condensation heat recovery device 5 is connected to the flue gas outlet of each heating furnace 9 through a flue. The heating furnace 9 is equipped with a burner 11. The flue gas outlet of the flue gas condensation heat recovery device 5 is connected to the chimney inlet. The water inlet of the flue gas condensation heat recovery device 5 is connected to the outlet of the waste water circulation pump 4 through a pipe. The water outlet of the flue gas condensation heat recovery device 5 is connected to the waste water inlet of the intelligent high-efficiency heat pump 3 through a pipe. The flue gas condensate outlet of the flue gas condensation heat recovery device 5 is connected to the inside of the condensate tank 8 through a pipe.

[0024] The main equipment of the heat energy upgrading unit is the intelligent high-efficiency heat pump 3. The intelligent high-efficiency heat pump 3 is electrically driven. The waste hot water inlet of the intelligent high-efficiency heat pump 3 is connected to the water outlet of the flue gas condensation heat deep recovery device 5 through a pipe. The waste hot water outlet of the intelligent high-efficiency heat pump 3 is connected to the inlet of the waste hot water circulation pump 4 through a pipe. The hot water inlet of the intelligent high-efficiency heat pump 3 is connected to the outlet of the hot water circulation pump 2 through a pipe. The hot water outlet of the intelligent high-efficiency heat pump 3 is connected to the hot water inlet of the anti-clogging plate heat exchanger 1 through a pipe.

[0025] The main equipment of the boiler water preheating unit is an anti-clogging plate heat exchanger 1. The boiler water inlet of the anti-clogging plate heat exchanger 1 is connected to the incoming liquid header through a pipeline. The boiler water outlet of the anti-clogging plate heat exchanger 1 is connected to the inlet of the heating furnace 9 through a pipeline. The hot water inlet of the anti-clogging plate heat exchanger 1 is connected to the hot water outlet of the intelligent high-efficiency heat pump 3 through a pipeline. The hot water outlet of the anti-clogging plate heat exchanger 1 is connected to the inlet of the hot water circulation pump 2 through a pipeline.

[0026] The main equipment of the flue gas condensate recovery unit is a condensate tank 8 and a condensate pump 7. The water space of the condensate tank 8 is connected to the flue gas condensate outlet of the flue gas condensation heat recovery device 5 through a pipeline. The outlet of the condensate tank 8 is connected to the inlet of the condensate pump 7 through a pipeline. The outlet of the condensate pump 7 is connected to the inlet of the heating furnace 9 through a pipeline.

[0027] Preferably, a check valve 6 is provided on the condensate pipeline to prevent boiler water from flowing back into the flue gas condensate recovery unit.

[0028] Preferably, the condensate tank 8 is equipped with a level gauge 10 for controlling the start and stop of the condensate pump 7.

[0029] Preferably, a pressure gauge 14 is provided at the flue gas outlet near the heating furnace 9 on the air intake flue to optimize the operation of the combustion system.

[0030] Preferably, the boiler water inlet, outlet and bypass pipes of the anti-clogging plate heat exchanger 1 are all equipped with electric shut-off valves 12, which are used to switch the operating mode of the boiler water system and ensure the safe operation of the heating furnace 9 production system.

[0031] Preferably, an electric shut-off valve 213 is provided on the flue of the flue gas outlet of the heating furnace 9 to switch the operating mode of the flue gas system and ensure the safe operation of the production system of the heating furnace 9.

[0032] The working principle of this utility model's oilfield heater flue gas comprehensive treatment device is as follows: The exhaust gases from several heaters 9 are collected together through the intake flue and introduced into the flue gas inlet of the flue gas condensation heat recovery device 5. High-temperature flue gas washes over the outer wall of the heat exchange tubes. Low-temperature waste water from the waste water circulation pump 4 enters the heat exchange tubes through the inlet of the flue gas condensation heat recovery device 5. The low-temperature waste water inside the tubes exchanges heat with the high-temperature flue gas outside the tubes through the tube walls. After absorbing heat and heating up, the low-temperature waste water is discharged from the outlet of the flue gas condensation heat recovery device 5 and enters the waste water inlet of the intelligent high-efficiency heat pump 3 through a pipeline. After the high-temperature flue gas releases heat and cools down, it passes through the flue gas condensation heat recovery device... The flue gas from outlet 5 is discharged into the chimney and eventually vented through the chimney. During the flue gas cooling process, some flue gas condensate is released. This condensate flows downwards through a pipe into condensate tank 8 under the influence of gravity. Condensate tank 8 is equipped with a level gauge 10. When the tank level reaches the upper limit, the condensate pump 7 is interlocked to discharge the water in condensate tank 8 into the boiler water at the inlet of heating furnace 9. When the tank level reaches the lower limit, the condensate pump 7 is interlocked to shut off until the level reaches the upper limit again, thus initiating the next drainage process. This cycle repeats continuously. The high-temperature waste water from the flue gas condensation heat recovery device 5 is discharged through the waste water inlet of the intelligent high-efficiency heat pump 3. The hot water enters the intelligent high-efficiency heat pump 3 and transfers heat to the liquid working fluid inside the heat pump through the evaporator. After the high-temperature waste water releases heat and cools down, it enters the waste water circulation pump 4 through a pipe via the waste water outlet of the intelligent high-efficiency heat pump 3. The liquid working fluid inside the heat pump absorbs heat, heats up, and vaporizes. Driven by the compressor inside the heat pump, the gaseous working fluid heats up and pressurizes before entering the condenser of the heat pump. The low-temperature hot water from the hot water circulation pump 2 enters the intelligent high-efficiency heat pump 3 through the hot water inlet. The high-temperature, high-pressure gaseous working fluid from the compressor transfers heat to the low-temperature hot water through the condenser. After the low-temperature hot water absorbs heat and heats up, it enters the anti-clogging plate heat exchanger through a pipe via the hot water outlet of the intelligent high-efficiency heat pump 3. At the hot water inlet of plate heat exchanger 1, the high-temperature and high-pressure gaseous working fluid releases heat, cools down, and liquefies. The liquid working fluid enters the evaporator through the expansion valve, starting the next cycle of heat exchange. Hot water from intelligent high-efficiency heat pump 3 enters the hot water side of anti-clogging plate heat exchanger 1 through the hot water inlet of anti-clogging plate heat exchanger 1. Boiler water from the inlet header enters the boiler water side of anti-clogging plate heat exchanger 1 through the boiler water inlet of anti-clogging plate heat exchanger 1. Hot water and boiler water complete the heat exchange process through the plates. After the hot water releases heat and cools down, it enters the inlet of hot water circulation pump 2 through the hot water outlet of anti-clogging plate heat exchanger 1 through the pipeline. After the boiler water absorbs heat and heats up, it enters the inlet of heating furnace 9 through the boiler water outlet of anti-clogging plate heat exchanger 1 through the pipeline.This achieves the goal of recovering waste heat from the flue gas of the heating furnace 9 for preheating the inlet water of the heating furnace 9. Simultaneously, since the inlet water temperature of the heating furnace 9 is generally between 35 and 40°C, and the hot water produced by the heat pump only needs to be above 50°C, the waste hot water temperature can be as low as 15°C. This 15°C waste hot water can cool the flue gas temperature of the heating furnace 9 to below 30°C, achieving deep reuse of flue gas waste heat. Furthermore, reusing the acidic flue gas condensate as a scale inhibitor can effectively alleviate the scaling problem of the furnace tubes of the heating furnace 9. This not only improves the operational safety of the heating furnace 9 and related equipment, but the flue gas condensate can also absorb some nitrogen oxides, reducing nitrogen oxide emissions. At the same time, it significantly reduces the water content of the flue gas, which is of great significance for environmental protection.

[0033] In summary, this utility model's comprehensive oilfield heater flue gas treatment device integrates an intelligent high-efficiency heat pump, a deep recovery device for flue gas condensation heat, and an anti-clogging plate heat exchanger, achieving the goal of reducing the heater exhaust temperature to below 30℃, deeply recovering the waste heat from the heater exhaust, and effectively improving the energy utilization efficiency of the entire system. This utility model's comprehensive oilfield heater flue gas treatment device comprehensively treats the collected flue gas from multiple heaters, reducing project investment costs and improving overall economic efficiency. This utility model's comprehensive oilfield heater flue gas treatment device adopts an intelligent automatic operation mode, improving the plant's production operation and management efficiency. This utility model's comprehensive oilfield heater flue gas treatment device recovers all flue gas condensate, reusing it as a scale inhibitor for boiler water, effectively improving the problem of scale formation on the outer wall of the boiler tubes. This utility model's comprehensive oilfield heater flue gas treatment device adopts a skid-mounted integrated design, facilitating production, transportation, and installation. This utility model's comprehensive treatment device for oilfield heating furnace flue gas not only maximizes the reduction of flue gas temperature, but also deeply removes water and nitrogen oxides from the flue gas, effectively purifying the heating furnace flue gas and protecting the natural environment.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in sequences other than those illustrated or described herein.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A comprehensive treatment device for flue gas from an oilfield heating furnace, characterized in that, include: The flue gas waste heat recovery unit, the heat energy upgrading unit, the boiler water preheating unit, and the flue gas condensate recovery unit are all connected and integrated into the skid-mounted structure via pipes and pumps. The flue gas waste heat recovery unit includes a flue gas condensation heat deep recovery device (5). The flue gas inlet of the flue gas condensation heat deep recovery device (5) is connected to the flue gas outlet of multiple heating furnaces (9) through a flue, and its flue gas outlet is connected to a chimney. The water inlet of the flue gas condensation heat deep recovery device (5) is connected to the outlet of the waste hot water circulation pump (4) through a pipe, and its water outlet is connected to the waste hot water inlet of the intelligent high-efficiency heat pump (3) of the heat energy upgrading unit through a pipe. The flue gas condensate outlet of the flue gas condensation heat deep recovery device (5) is connected to the condensate tank (8) of the flue gas condensate recovery unit through a pipe. The heat energy upgrading unit includes an intelligent high-efficiency heat pump (3). The waste hot water outlet of the intelligent high-efficiency heat pump (3) is connected to the inlet of the waste hot water circulation pump (4) through a pipe. Its hot water inlet is connected to the outlet of the hot water circulation pump (2) through a pipe. Its hot water outlet is connected to the hot water inlet of the anti-clogging plate heat exchanger (1) of the boiler water preheating unit through a pipe. The boiler water preheating unit includes an anti-clogging plate heat exchanger (1). The boiler water inlet of the anti-clogging plate heat exchanger (1) is connected to the incoming liquid header through a pipe, the boiler water outlet is connected to the water inlet of the heating furnace (9) through a pipe, and the hot water outlet is connected to the inlet of the hot water circulation pump (2) through a pipe. The flue gas condensate recovery unit includes a condensate tank (8) and a condensate pump (7). The outlet of the condensate tank (8) is connected to the inlet of the condensate pump (7) through a pipe, and the outlet of the condensate pump (7) is connected to the inlet of the heating furnace (9) through a pipe.

2. The comprehensive treatment device for oilfield heating furnace flue gas as described in claim 1, characterized in that, A check valve (6) is installed on the condensate pipeline of the flue gas condensate recovery unit.

3. The comprehensive treatment device for flue gas from an oilfield heating furnace as described in claim 1, characterized in that, The condensate tank (8) is equipped with a level gauge (10), which is interlocked with the condensate pump (7).

4. The comprehensive treatment device for oilfield heating furnace flue gas as described in claim 1, characterized in that, A pressure gauge (14) is provided at the flue gas outlet near the heating furnace (9) on the flue.

5. The comprehensive treatment device for flue gas from an oilfield heating furnace as described in claim 1, characterized in that, The anti-clogging plate heat exchanger (1) is equipped with an electric shut-off valve (12) on the boiler water inlet and outlet pipes.

6. The comprehensive treatment device for oilfield heating furnace flue gas as described in claim 1, characterized in that, The heating furnace (9) is equipped with an electric shut-off valve 2 (13) on the flue gas outlet duct.

7. The comprehensive treatment device for flue gas from an oilfield heating furnace as described in claim 1, characterized in that, The heat exchange element of the flue gas condensation heat recovery device (5) is a finned heat exchange tube. The outer side of the finned heat exchange tube is the flue gas channel, and the inner side is the waste water channel.

8. The comprehensive treatment device for flue gas from an oilfield heating furnace as described in claim 1, characterized in that, The intelligent high-efficiency heat pump (3) includes an evaporator, a compressor, a condenser and an expansion valve. The inlet and outlet of the evaporator are connected to the inlet and outlet of the flue gas condensation heat recovery device (5) respectively. The inlet and outlet of the condenser are connected to the hot water outlet and inlet of the anti-clogging plate heat exchanger (1) respectively.

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