Nitrogen-free atmospheric superconducting heating furnace

Abstract

This invention discloses a nitrogen-free atmospheric pressure superconducting heater, which relates to the field of heaters. The heater includes a heater body, within which an oil-water coil, an oxygen preheating pipe, a natural gas preheating pipe, and a combustion chamber are arranged. A superconducting heat pipe is installed at the top of the combustion chamber. A pure oxygen generator is installed at one end of the oxygen preheating pipe, and a natural gas source is installed at one end of the natural gas preheating pipe. An oxygen-enriched burner is installed on the side of the heater body. This nitrogen-free atmospheric pressure superconducting heater integrates environmental protection, energy saving, and safety. It solves the problems of inaccurate nitrogen control and inability to ensure long-term stable NOx compliance in existing heaters with low-NOx burners; it also solves the problem of existing heaters using conventional low-NOx burners generating large amounts of sulfurized condensate that corrodes the chimney; and it addresses the issues of existing heaters operating under closed pressure, being pressure vessels requiring mandatory annual inspections of the equipment and safety accessories, posing high-pressure risks and complex maintenance requirements.

Description

Technical Field

[0001] This invention relates to the field of heating furnaces, and in particular to a nitrogen-free atmospheric pressure superconducting heating furnace. Background Technology

[0002] Currently, the low-NOx burners used in oilfield production heating furnaces cannot continuously and stably control NOx emissions, resulting in large fluctuations in NOx emissions during operation and failing to meet environmental protection requirements.

[0003] Meanwhile, existing low-NOx burners employ methods such as lowering the furnace flame temperature and using low-temperature combustion to reduce NOx formation. This reduces furnace efficiency by 10% and flue gas temperature by more than 60°C, resulting in the production of large amounts of sulfide condensate, which corrodes the chimney. Furthermore, existing heating furnaces all operate in a closed, pressurized mode, typically designed at a pressure of 0.4 MPa, with water (softened water, superconducting fluid, etc.) as the heat transfer medium. Operating temperatures range from 110 to 130°C, and pressure varies with temperature. Safety valves and over-temperature protection are included as safety measures. Both the equipment itself and its safety accessories are subject to mandatory annual inspections. This presents high-pressure risks and complex maintenance requirements.

[0004] Therefore, it is necessary to propose a nitrogen-free atmospheric pressure superconducting furnace to solve the above problems. Summary of the Invention

[0005] The main objective of this invention is to provide a nitrogen-free, atmospheric pressure superconducting heating furnace, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A nitrogen-free atmospheric pressure superconducting heating furnace includes a heating furnace body, wherein an oil-water coil, an oxygen preheating pipe, a natural gas preheating pipe, and a combustion tube are arranged in the inner cavity of the heating furnace body, and a superconducting heat pipe is arranged at the top of the combustion tube. A pure oxygen generator is installed at one end of the oxygen preheating pipe, a natural gas source is installed at one end of the natural gas preheating pipe, and an oxygen-enriched burner is installed on the side of the heating furnace body.

[0007] Preferably, the oil-water coil is installed in the inner cavity of the heating furnace body, one end of the oil-water coil extends to the outside of the heating furnace body, and the end of the oil-water coil extending to the outside of the heating furnace body has an oil-water inlet and outlet. The pure oxygen unit and the natural gas source are located on the outside of the heating furnace body.

[0008] Preferably, the other end of the oxygen preheating pipe penetrates the outer wall of the furnace body and is connected to the oxygen-enriched burner, and the other end of the natural gas preheating pipe penetrates the outer wall of the furnace body and is connected to the oxygen-enriched burner. The pure oxygen unit inputs oxygen into the oxygen-enriched burner through the oxygen preheating pipe, and the natural gas source transports natural gas to the oxygen-enriched burner through the natural gas preheating pipe.

[0009] Preferably, the inner cavity of the heating furnace body is filled with a high-boiling-point heat transfer medium.

[0010] Preferably, the combustion tube is installed at the bottom of the inner cavity of the heating furnace body, the superconducting heat pipe is installed in the inner cavity of the heating furnace body, and the bottom of the superconducting heat pipe is attached to the top of the combustion tube.

[0011] Preferably, a chimney is installed on the side of the heating furnace body.

[0012] Preferably, the shell of the heating furnace body is open to the atmosphere and the pressure is <0.05MPa. The boiling point of the high-boiling-point heat medium is ≥150℃ at normal pressure. The oil-water coil, oxygen preheating pipe, natural gas preheating pipe, superconducting heat pipe, and combustion tube are all immersed in the high-boiling-point heat medium.

[0013] Preferably, the superconducting heat pipe is used to increase the heat exchange area of ​​the combustion tube, quickly dissipate heat, and prevent local overheating of the combustion tube.

[0014] Preferably, lifting lugs are symmetrically installed on both sides of the top of the heating furnace body, and saddles are symmetrically installed on both sides of the bottom of the heating furnace body.

[0015] Preferably, the top of the heating furnace body is equipped with a vent and a liquid filling port. There are two vents, which are connected to the inner cavity of the heating furnace body. The liquid filling port is also connected to the inner cavity of the heating furnace body. The heating furnace body is connected to the outside atmosphere through the vents.

[0016] Compared with the prior art, the present invention provides a nitrogen-free atmospheric pressure superconducting heating furnace, which has the following beneficial effects: This nitrogen-free atmospheric pressure superconducting heating furnace combines nitrogen-free all-oxygen combustion and atmospheric pressure superconducting heating technologies, which can effectively solve the problems mentioned in the background technology and achieve the effects of environmental protection, energy saving and safety.

[0017] This nitrogen-free atmospheric pressure superconducting heater integrates environmental protection, energy saving, and safety. It can solve the problems of inaccurate nitrogen control by low-NOx burners in existing heaters, which cannot ensure long-term stable NOx compliance; it can also solve the problem of existing heaters producing a large amount of sulfurized condensate and corroding the chimney due to the use of conventional low-NOx burners; and it can also solve the problem of existing heaters operating under closed pressure, which are pressure vessels and require mandatory annual inspections of the equipment body and safety accessories, posing high-pressure risks and complex maintenance needs.

[0018] This nitrogen-free, atmospheric pressure superconducting heater, used in crude oil heating, replaces conventional low-nitrogen combustion (air-assisted combustion) with oxygen-enriched combustion (pure oxygen-assisted combustion). The heater body is an open-top atmospheric pressure furnace, with its shell open to the atmosphere at a pressure <0.05 MPa. It lacks safety accessories and replaces existing pressure vessel furnaces, which operate in a closed system at a pressure of 0.1~0.38 MPa and include mandatory safety accessories.

[0019] This nitrogen-free atmospheric pressure superconducting heater uses a high-boiling-point heat transfer medium with a boiling point of ≥150°C at atmospheric pressure to replace the currently used low-boiling-point heat transfer medium with a boiling point of ≤100°C at atmospheric pressure. Simultaneously, oxygen preheating pipes and natural gas preheating pipes are designed inside the heater body, enabling more stable combustion and improved furnace thermal efficiency even in cold winters.

[0020] This nitrogen-free, atmospheric-pressure superconducting furnace features superconducting heat pipes arranged on the combustion chamber, increasing its heat exchange area for rapid heat dissipation and preventing localized overheating. The furnace body also includes a pure oxygen generator, a natural gas source, and an oxygen-enriched burner. The furnace body is connected to the atmosphere via a top vent. The furnace cavity is filled with a high-boiling-point heat transfer medium, and the combustion chamber, oil-water coils, oxygen preheating pipes, and natural gas preheating pipes are all immersed in this medium.

[0021] This nitrogen-free, atmospheric pressure superconducting heater utilizes nitrogen-free, all-oxygen combustion technology. It separates oxygen from the air using pressure swing adsorption molecular sieves, using pure oxygen to improve the natural gas combustion environment and increase combustion efficiency, thus producing only carbon dioxide and water after combustion. While achieving 100% compliance with nitrogen oxide emissions standards, it can save 30-50% of natural gas. It also increases the furnace temperature by 80-150℃, effectively solving the problem of chimney condensate corrosion. The atmospheric pressure superconducting heating technology used in this invention replaces the low-boiling-point heat transfer medium with a high-boiling-point heat transfer medium—a new type of heat transfer medium with a boiling point ≥150℃ at atmospheric pressure that does not coke or deteriorate during static heating. Based on this, existing high-temperature, high-pressure heaters can be designed and modified into absolutely safe atmospheric pressure heaters while meeting production heating requirements. This also eliminates high-pressure risks and complex maintenance needs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a plan view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the combustion tube of the present invention.

[0023] In the diagram: 1. Furnace body; 2. Lifting lug; 3. Breather port; 4. Liquid filling port; 5. Pure oxygen unit; 6. Natural gas source; 7. Oil and water inlet / outlet; 8. High boiling point heat transfer medium; 9. Oxygen preheating pipe; 10. Natural gas preheating pipe; 11. Oil and water coil; 12. Combustion tube; 13. Saddle; 14. Oxygen-enriched burner; 15. Chimney; 16. Superconducting heat pipe. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0025] Example 1: like Figures 1-4 As shown, a nitrogen-free atmospheric pressure superconducting heating furnace includes a heating furnace body 1. The inner cavity of the heating furnace body 1 is provided with an oil-water coil 11, an oxygen preheating pipe 9, a natural gas preheating pipe 10, and a combustion tube 12. A superconducting heat pipe 16 is provided on the top of the combustion tube 12. The other end of the oxygen preheating pipe 9 passes through the outer wall of the heating furnace body 1 and is connected to the oxygen-enriched burner 14. The other end of the natural gas preheating pipe 10 passes through the outer wall of the heating furnace body 1 and is connected to the oxygen-enriched burner 14. The pure oxygen unit 5 inputs oxygen into the oxygen-enriched burner 14 through the oxygen preheating pipe 9. The natural gas source 6 transports natural gas to the oxygen-enriched burner 14 through the natural gas preheating pipe 10. The inner cavity of the heating furnace body 1 is filled with a high-boiling-point heat transfer medium 8; The shell of the heating furnace body 1 is open to the atmosphere and the pressure is <0.05MPa. The boiling point of the high boiling point heat medium 8 is ≥150℃ at normal pressure. The oil-water coil 11, oxygen preheating pipe 9, natural gas preheating pipe 10, superconducting heat pipe 16, and combustion tube 12 are all immersed in the high boiling point heat medium 8. The combustion tube 12 is installed at the bottom of the inner cavity of the heating furnace body 1, and the superconducting heat pipe 16 is installed in the inner cavity of the heating furnace body 1, with the bottom of the superconducting heat pipe 16 attached to the top of the combustion tube 12. The superconducting heat pipe 16 is used to increase the heat exchange area of ​​the combustion tube 12, quickly dissipate heat, and prevent local overheating of the combustion tube 12.

[0026] Example 2: like Figures 1-4As shown, a nitrogen-free atmospheric pressure superconducting heating furnace has a pure oxygen unit 5 installed at one end of the oxygen preheating pipe 9, a natural gas source 6 installed at one end of the natural gas preheating pipe 10, and an oxygen-enriched burner 14 installed on the side of the heating furnace body 1. The oil-water coil 11 is installed in the inner cavity of the heating furnace body 1. One end of the oil-water coil 11 extends to the outside of the heating furnace body 1. The oil-water coil 11 extending to the outside of the heating furnace body 1 has an oil-water inlet and outlet 7. The pure oxygen unit 5 and the natural gas source 6 are located on the outside of the heating furnace body 1. A chimney 15 is installed on the side of the heating furnace body 1.

[0027] The top of the heating furnace body 1 is symmetrically equipped with lifting lugs 2 on both sides, and the bottom of the heating furnace body 1 is symmetrically equipped with saddles 13 on both sides. The top of the heating furnace body 1 is equipped with a breather 3 and a liquid inlet 4. There are two breather 3s. The breather 3s are connected to the inner cavity of the heating furnace body 1, and the liquid inlet 4 is connected to the inner cavity of the heating furnace body 1. The heating furnace body 1 is connected to the outside atmosphere through the breather 3s.

[0028] This invention combines nitrogen-free oxy-fuel combustion and atmospheric pressure superconducting heating technologies, effectively solving the problems mentioned in the background technology and achieving the following results: Environmental protection: 100% compliance with standards, with 24-hour environmental monitoring; Energy saving: 30-50% energy saving; Safety: atmospheric pressure operation, eliminating high-pressure risks. Compared with existing low-NOx burners, it increases the furnace temperature by 80-150℃ and solves the problem of chimney condensate corrosion.

[0029] It should be noted that the present invention is a nitrogen-free atmospheric pressure superconducting heating furnace. In use, the pure oxygen in the pure oxygen unit 5 is separated from the oxygen in the air through pressure swing adsorption molecular sieve. The pure oxygen unit 5 and the natural gas source 6 input pure oxygen and natural gas into the oxygen-enriched burner 14 through the oxygen preheating pipe 9 and the natural gas preheating pipe 10. The oxygen-enriched burner 14 uses air-assisted combustion. After the oxygen-enriched burner 14 is started, it can heat and burn the combustion tube 12. When the combustion tube 12 is heated, the superconducting heat pipe 16 attached to its surface assists the combustion tube 12 in heat dissipation. When the heating furnace body 1 is working, it is connected to the atmosphere through the breather 3. The oil and water inlet and outlet 7 and the oil and water coil 11 are used to input oil and water for feeding, heating and discharging. Chimney 15 is used to exhaust the generated flue gas; When used in cold seasons, the oxygen preheating pipe 9 and the natural gas preheating pipe 10, which are immersed in the high-boiling-point heat medium 8, can achieve a preheating effect, thereby making the combustion of the furnace body 1 more stable.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A nitrogen-free atmospheric pressure superconducting heating furnace, comprising a heating furnace body (1), characterized in that: The inner cavity of the heating furnace body (1) is provided with an oil-water coil (11), an oxygen preheating pipe (9), a natural gas preheating pipe (10), and a combustion tube (12). A superconducting heat pipe (16) is provided on the top of the combustion tube (12). One end of the oxygen preheating pipe (9) is equipped with a pure oxygen unit (5), one end of the natural gas preheating pipe (10) is equipped with a natural gas source (6), and an oxygen-enriched burner (14) is installed on the side of the heating furnace body (1).

2. The nitrogen-free atmospheric pressure superconducting heating furnace according to claim 1, characterized in that: The oil-water coil (11) is installed in the inner cavity of the heating furnace body (1). One end of the oil-water coil (11) extends to the outside of the heating furnace body (1). The oil-water coil (11) extending to the outside of the heating furnace body (1) has an oil-water inlet and outlet (7). The pure oxygen unit (5) and the natural gas source (6) are located on the outside of the heating furnace body (1).

3. The nitrogen-free atmospheric pressure superconducting heating furnace according to claim 1, characterized in that: The other end of the oxygen preheating pipe (9) penetrates the outer wall of the heating furnace body (1) and is connected to the oxygen-enriched burner (14). The other end of the natural gas preheating pipe (10) penetrates the outer wall of the heating furnace body (1) and is connected to the oxygen-enriched burner (14). The pure oxygen unit (5) inputs oxygen into the oxygen-enriched burner (14) through the oxygen preheating pipe (9). The natural gas source (6) transports natural gas into the oxygen-enriched burner (14) through the natural gas preheating pipe (10).

4. The nitrogen-free atmospheric pressure superconducting heating furnace according to claim 1, characterized in that: The inner cavity of the heating furnace body (1) is filled with a high-boiling-point heat transfer medium (8).

5. A nitrogen-free atmospheric pressure superconducting heating furnace according to claim 1, characterized in that: The combustion tube (12) is installed at the bottom of the inner cavity of the heating furnace body (1), and the superconducting heat pipe (16) is installed in the inner cavity of the heating furnace body (1), with the bottom of the superconducting heat pipe (16) attached to the top of the combustion tube (12).

6. A nitrogen-free atmospheric pressure superconducting heating furnace according to claim 5, characterized in that: A chimney (15) is installed on the side of the heating furnace body (1).

7. A nitrogen-free atmospheric pressure superconducting heating furnace according to claim 4, characterized in that: The shell of the heating furnace body (1) is connected to the atmosphere and the pressure is <0.05MPa. The boiling point of the high boiling point heat medium (8) is ≥150℃ under normal pressure. The oil-water coil (11), oxygen preheating pipe (9), natural gas preheating pipe (10), superconducting heat pipe (16), and combustion tube (12) are all immersed in the high boiling point heat medium (8).

8. The nitrogen-free atmospheric pressure superconducting heating furnace according to claim 1, characterized in that: The superconducting heat pipe (16) is used to increase the heat exchange area of ​​the combustion tube (12), quickly dissipate heat, and prevent local overheating of the combustion tube (12).

9. A nitrogen-free atmospheric pressure superconducting heating furnace according to claim 1, characterized in that: The heating furnace body (1) is symmetrically equipped with lifting lugs (2) on both sides of the top, and saddles (13) are symmetrically installed on both sides of the bottom.

10. A nitrogen-free atmospheric pressure superconducting heating furnace according to claim 1, characterized in that: The top of the heating furnace body (1) is equipped with a vent (3) and a liquid filling port (4). There are two vents (3). The vents (3) are connected to the inner cavity of the heating furnace body (1). The liquid filling port (4) is connected to the inner cavity of the heating furnace body (1). The heating furnace body (1) is connected to the outside atmosphere through the vents (3).

Images