associated gas combustion power generation unit rich in nitrogen from oil fields

Abstract

This utility model discloses a nitrogen-rich associated gas combustion power generation device for oilfields, comprising a gas generator body, an intake pipe and an exhaust pipe connected to the gas generator body, the outlet of the exhaust pipe connected to the end of a premixing pipe, the inlet of the intake pipe connected to the outlet of a venturi tube, and the inlet of the venturi tube connected to one side of the end of the premixing pipe; an associated gas inlet pipe, an air inlet pipe and a makeup gas inlet pipe are connected to the pipe wall of the premixing pipe away from the end of the exhaust pipe; three exhaust branch pipes arranged in an equilateral triangle are installed inside the premixing pipe, and multiple spirally distributed guide vanes are installed on the inner wall of the premixing pipe. The combustion power generation device provided by this utility model can significantly increase the intake temperature by utilizing its own high-temperature exhaust gas and adapt to fluctuations in fuel composition to compensate for insufficient calorific value, enabling stable combustion power generation of nitrogen-rich, low-calorific-value associated gas from oilfields.

Description

Technical Field

[0001] This utility model relates to a combustion power generation device, specifically, to a combustion power generation device for associated gas from an oil field rich in nitrogen, belonging to the field of associated gas combustion power generation technology. Background Technology

[0002] Associated gas in oil fields is a type of natural gas resource that can be recovered and utilized. It refers to the gas that is carried out and emitted during the oil extraction process, and its main components are hydrocarbons such as methane, ethane, and propane.

[0003] Due to varying geological formation mechanisms, many oilfield associated gas sources contain significant amounts of nitrogen. As an inert gas, nitrogen reduces the calorific value of associated gas. The heat released from the combustion of low-calorific-value associated gas is insufficient to drive stable power generation in generator sets. Furthermore, low-calorific-value associated gas is difficult to ignite or prone to flameout after ignition. Currently, nitrogen-rich associated gas cannot be directly applied to conventional gas turbine generator sets, which are typically designed for high-calorific-value fuels. Therefore, nitrogen-rich associated gas usually requires venting and combustion.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] This invention addresses the shortcomings of the prior art by providing a nitrogen-rich associated gas combustion power generation device for oilfields. It can significantly increase the intake temperature by utilizing its own high-temperature exhaust gas and adapt to fluctuations in fuel composition to compensate for insufficient calorific value, thereby enabling stable combustion and power generation of nitrogen-rich, low-calorific-value associated gas from oilfields.

[0006] To solve the above technical problems, the present invention adopts the following technical solution: A nitrogen-rich associated gas combustion power generation unit for oilfields includes a gas generator body, on which an intake pipe and an exhaust pipe are connected. The outlet of the exhaust pipe is connected to the end of a premixing pipe, and the inlet of the intake pipe is connected to the outlet of a venturi pipe. The inlet of the venturi pipe is connected to one side of the end of the premixing pipe. An associated gas inlet pipe, an air inlet pipe, and a makeup gas inlet pipe are connected to the pipe wall of the premixing pipe away from the end of the exhaust pipe. Three exhaust branch pipes arranged in an equilateral triangle are installed inside the premixing pipe, and multiple guide vanes arranged in a spiral pattern are installed on the inner wall of the premixing pipe.

[0007] Furthermore, the outlet of the exhaust main pipe and the end of the premixing pipe, as well as the inlet of the intake main pipe and the outlet of the venturi pipe, are connected by flanges.

[0008] Furthermore, a sealing cap is fixedly installed on the end of the premixing pipe away from the exhaust main pipe.

[0009] Furthermore, one end of the exhaust branch pipe extends into the exhaust main pipe, and the high-temperature exhaust gas in the exhaust main pipe can be diverted into each exhaust branch pipe.

[0010] Furthermore, the other end of the exhaust manifold passes through the sealing cap.

[0011] Furthermore, the associated petroleum gas inlet pipe, air inlet pipe, and supplementary gas inlet pipe are all connected to the inner cavity of the premixed pipe.

[0012] Furthermore, flow regulating valves are installed on the associated petroleum gas inlet pipe, air inlet pipe, and supplementary gas inlet pipe.

[0013] Furthermore, the guide vane has a semi-circular structure.

[0014] Furthermore, the semi-circular structure has mounting holes for the exhaust branch pipe to pass through.

[0015] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages: It uses its own high-temperature exhaust gas to preheat the air-fuel mixture that is about to enter the engine. The preheated air-fuel mixture has a higher temperature and increased molecular activity, which allows it to burn faster and more completely after entering the combustion chamber. This stabilizes the combustion process and makes up for some of the calorific value reduction caused by the presence of nitrogen. When the calorific value of the associated gas is too low, supplementary gas can be added appropriately to compensate for some of the calorific value, so as to operate at the lowest cost and adapt to the fluctuation of fuel composition. By incorporating an exhaust branch pipe and guide vanes into the premixing pipe, efficient premixing and preheating of the gas mixture can be achieved.

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural cross-sectional view of the present invention; Figure 3 yes Figure 2 Enlarged view of a local structure.

[0018] In the diagram, 1-gas generator body, 2-intake main pipe, 3-exhaust main pipe, 4-premix pipe, 5-flange, 6-sealing cover, 7-exhaust branch pipe, 8-guide vane, 9-petroleum associated gas inlet pipe, 10-makeup gas inlet pipe, 11-air inlet pipe, 12-flow regulating valve, 13-venturi tube. Detailed Implementation

[0019] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0020] like Figures 1-3 As shown in the figure, this utility model provides a nitrogen-rich associated gas combustion power generation device for oil fields, including a gas generator body 1. The gas generator body 1 is connected to an intake pipe 2 and an exhaust pipe 3. The outlet of the exhaust pipe 3 is connected to the end of a premixed pipe 4 through a flange 5. The inlet of the intake pipe 2 is connected to the outlet of a venturi pipe 13 through a flange 5. The inlet of the venturi pipe 13 is connected to one side of the end of the premixed pipe 4.

[0021] A sealing cap 6 is fixedly installed on the end of the premixing pipe 4 furthest from the exhaust main pipe 3. Three exhaust branch pipes 7 arranged in an equilateral triangle are installed inside the premixing pipe 4. One end of each exhaust branch pipe 7 extends into the exhaust main pipe 3, allowing the high-temperature exhaust gas in the exhaust main pipe 3 to be diverted into each exhaust branch pipe 7. The other end of each exhaust branch pipe 7 passes through the sealing cap 6 for exhaust. The exhaust branch pipes 7 are not connected to the premixing pipe 4. Multiple exhaust branch pipes 7 are used to increase the heat exchange area.

[0022] The premixed pipe 4 is connected to the end of the pipe away from the exhaust pipe 3 by a petroleum associated gas inlet pipe 9, an air inlet pipe 11 and a supplementary gas inlet pipe 10. The petroleum associated gas inlet pipe 9, the air inlet pipe 11 and the supplementary gas inlet pipe 10 are all connected to the inner cavity of the premixed pipe 4.

[0023] Flow regulating valves 12 are installed on the associated petroleum gas inlet pipe 9, the air inlet pipe 11, and the supplementary gas inlet pipe 10.

[0024] The associated petroleum gas inlet pipe 9 is used to input associated petroleum gas, which serves as the primary fuel for combustion power generation. The air inlet pipe 11 provides the oxygen required for combustion. The supplementary gas inlet pipe 10 is used for inputting standby or auxiliary fuel, supplementing or replacing the primary fuel when its calorific value is insufficient.

[0025] By adjusting the opening of the flow regulating valve 12 on each pipeline, the flow rate of various gases can be precisely controlled, thereby controlling the ratio and total flow rate of the mixture to ensure stable and efficient combustion.

[0026] The inner wall of the premixed pipe 4 is equipped with multiple spirally distributed guide vanes 8. The guide vanes 8 have a semi-circular structure. The spirally distributed guide vanes 8 cause the intake air to flow around the cavity between the outer wall of the exhaust branch pipe 7 and the inner wall of the premixed pipe 4. During the flow, the heat of the exhaust gas in the exhaust branch pipe 7 is fully absorbed to achieve temperature rise.

[0027] By preheating the intake air to a certain temperature, heat loss during combustion can be reduced, allowing fuel to burn at a higher and more stable temperature, thereby improving the engine's thermal efficiency and ultimately resulting in increased power generation.

[0028] The specific working principle of this utility model is as follows: Exhaust gas flow: The high-temperature exhaust gas generated by the main body 1 of the gas generator flows sequentially into the exhaust main pipe 3 and the three exhaust branch pipes 7. During the flow in the exhaust branch pipes 7, the heat is transferred to the cold mixed gas outside the pipe through the pipe wall, so as to preheat the cold mixed gas.

[0029] Fuel / Air Flow: Associated petroleum gas and air enter the premixing pipe 4 through their respective pipelines. They begin to mix at the front end of the premixing pipe 4, and are guided by the guide vanes 8 during mixing, flowing in a spiral pattern. During this flow, heat is continuously absorbed from the outer wall of the exhaust branch pipe 7, causing the temperature to rise significantly and forming a high-temperature premixed combustible gas. If necessary, supplementary gas will also be added in proportion.

[0030] High-efficiency combustion and power generation: The preheated premixed gas is drawn into the intake manifold 2 by the suction of the venturi tube 13, and then enters the combustion chamber of the gas generator body 1 to generate electricity. Preheating makes the fuel vaporization more complete, mixes more evenly with the air, and burns more quickly and completely, thus improving the thermal efficiency of the engine.

[0031] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A nitrogen-rich associated gas combustion power generation device for oilfields, comprising a gas generator body (1), wherein an intake pipe (2) and an exhaust pipe (3) are connected to the gas generator body (1), characterized in that: The outlet of the exhaust pipe (3) is connected to the end of the premix pipe (4), the inlet of the intake pipe (2) is connected to the outlet of the venturi pipe (13), and the inlet of the venturi pipe (13) is connected to one side of the end of the premix pipe (4). The premix pipe (4) is connected to the oil-associated gas inlet pipe (9), the air inlet pipe (11) and the supplementary gas inlet pipe (10) on the pipe wall away from the end of the exhaust pipe (3). Three exhaust branch pipes (7) arranged in an equilateral triangle are installed inside the premix pipe (4), and multiple guide vanes (8) arranged in a spiral shape are installed on the inner wall of the premix pipe (4).

2. The nitrogen-rich associated gas combustion power generation device for oil fields as described in claim 1, characterized in that: The outlet of the exhaust pipe (3) and the end of the premix pipe (4), and the inlet of the intake pipe (2) and the outlet of the venturi pipe (13) are connected by flanges (5).

3. The nitrogen-rich associated gas combustion power generation device for oil fields as described in claim 1, characterized in that: A sealing cap (6) is fixedly installed on the end of the premix pipe (4) away from the exhaust pipe (3).

4. The nitrogen-rich associated gas combustion power generation device for oil fields as described in claim 3, characterized in that: One end of the exhaust branch pipe (7) extends into the exhaust main pipe (3), and the high-temperature exhaust gas in the exhaust main pipe (3) can be diverted to each exhaust branch pipe (7).

5. The nitrogen-rich associated gas combustion power generation device for oil fields as described in claim 4, characterized in that: The other end of the exhaust manifold (7) passes through the sealing cap (6).

6. The nitrogen-rich associated gas combustion power generation device for oil fields as described in claim 1, characterized in that: The associated petroleum gas inlet pipe (9), air inlet pipe (11), and supplementary gas inlet pipe (10) are all connected to the inner cavity of the premixed pipe (4).

7. The nitrogen-rich associated gas combustion power generation device for oil fields as described in claim 1, characterized in that: The associated petroleum gas inlet pipe (9), air inlet pipe (11) and supplementary gas inlet pipe (10) are all equipped with flow regulating valves (12).

8. The nitrogen-rich associated gas combustion power generation device for oil fields as described in claim 1, characterized in that: The guide vane (8) has a semi-circular structure.

9. The nitrogen-rich associated gas combustion power generation device for oil fields as described in claim 8, characterized in that: The semi-circular structure has mounting holes for the exhaust branch pipe (7) to pass through.

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