Dual-working-medium coupling heating system for natural gas treatment

Abstract

The invention relates to a natural gas treatment double-working-medium coupling heating system which comprises a heating furnace, and a first heating coil and a second heating coil are arranged in the heating furnace. A partition plate is arranged between the first heating coil and the second heating coil; a first flue baffle is arranged at a smoke outlet of the first heating coil, and a second flue baffle is arranged at a smoke outlet of the second heating coil; the first heating coil is used for heating a first working medium, and the second heating coil is used for heating a second working medium. The opening degree of the first flue baffle and the opening degree of the second flue baffle are controlled through the automatic control system, and flue gas efficiency control is achieved. According to the natural gas treatment double-working-medium coupling heating system, a double-working-medium coupling heating mode is adopted, heating of two working media with different temperature requirements is achieved, the maximum utilization of the smoke efficiency of the heating system can be achieved, and the system is simple in structure, convenient to operate and wide in application scene.

Description

Technical Field

[0001] The invention relates to the field of natural gas processing, and in particular to a dual-fluid coupling heating system for natural gas processing. Background Art

[0002] Heating furnaces are commonly used equipment in the process of natural gas extraction and processing. The heating furnaces in the prior art have a single function, and a single heating furnace often cannot meet the heating requirements of different working fluids. In order to heat different working fluids, multiple heating furnaces need to be set up, which leads to complex system structure, difficult maintenance and management, and increased costs. The heating furnaces in the prior art are mostly general commodities with poor adaptability and cannot meet the personalized heating needs in specific scenarios. In addition, the heating furnaces in the prior art often ignore the regulation of flue gas efficiency and cannot perform heat regulation according to the heating requirements of different working fluids. It is difficult to maximize the utilization of flue gas efficiency, resulting in energy waste. Summary of the invention

[0003] The present invention aims to address the technical problems in the field of natural gas processing, such as single function of heating furnaces, poor scene adaptability, low flue gas efficiency utilization and low degree of automation, and to provide a natural gas processing dual-fluid coupled heating system. The dual-fluid coupled heating system can simultaneously meet the heating needs of different working fluids, automatically regulate heat according to the heating needs of different working fluids, and maximize the utilization of flue gas efficiency. It also has a high degree of automation, a simple structure, and easy operation, and has broad application prospects.

[0004] The technical solution provided by the present invention is as follows:

[0005] A dual-medium coupled heating system for natural gas processing, comprising a heating furnace, the heating furnace having a convection section and a radiation section, characterized in that:

[0006] The heating furnace is provided with a first heating coil and a second heating coil.

[0007] The first heating coil is arranged in the convection section and the radiation section of the heating furnace, and is used to heat the working medium 1; the second heating coil is arranged in the convection section of the heating furnace, and is used to heat the working medium 2;

[0008] A partition is provided between the first heating coil and the second heating coil;

[0009] A first flue baffle is provided at the smoke outlet of the first heating coil; a second flue baffle is provided at the smoke outlet of the second heating coil;

[0010] The working medium enters the first heating coil from the convection section of the heating furnace, exchanges heat with the high-temperature flue gas outside the first heating coil, and then exits from the radiation section of the heating furnace;

[0011] The second working medium enters the second heating coil from the convection section of the heating furnace, exchanges heat with the high-temperature flue gas outside the second heating coil, and then exits from the convection section of the heating furnace;

[0012] The high-temperature flue gas in the heating furnace exchanges heat with the working medium 1 in the first heating coil and the working medium 2 in the second heating coil, and then is discharged from the chimney of the heating furnace through the first flue baffle and the second flue baffle.

[0013] The basic working principle of the present invention:

[0014] Two groups of heating coils, namely a first heating coil and a second heating coil, are arranged in the heating furnace to meet the heating requirements of different working fluids.

[0015] The first heating coil is arranged in the convection section and the radiation section of the heating furnace; the second heating coil is arranged in the convection section of the heating furnace; the two groups of heating coils are separated by a partition;

[0016] A first flue baffle is provided at the smoke outlet of the first heating coil; a second flue baffle is provided at the smoke outlet of the second heating coil;

[0017] Working medium 1 enters the first heating coil from the convection section of the heating furnace, exchanges heat with the high-temperature flue gas outside the first heating coil, and then exits from the radiation section of the heating furnace; working medium 2 enters the second heating coil from the convection section of the heating furnace, exchanges heat with the high-temperature flue gas outside the second heating coil, and then exits from the convection section of the heating furnace;

[0018] The high-temperature flue gas in the heating furnace exchanges heat with the working medium 1 in the first heating coil and the working medium 2 in the second heating coil, and then is discharged from the chimney of the heating furnace through the first flue baffle and the second flue baffle.

[0019] By setting up two groups of heating coils, the heating requirements of different working fluids are met.

[0020] According to the technical solution of the present invention, the working fluid (medium) entering the first heating coil and the second heating coil are respectively two media with different temperature heating requirements. According to actual needs, the working fluid can be any one of heat transfer oil, natural gas, regenerated gas, water, crude oil, refined oil or water-containing crude oil.

[0021] The present invention has no particular limitation on the furnace body structure of the heating furnace, and the furnace body structure of the heating furnace may be any one of a vertical structure, a horizontal structure, or a horizontal-vertical structure.

[0022] According to the technical solution of the present invention, the coil structure of the first heating coil and the second heating coil can be a serpentine tube or a spiral tube; the first heating coil and the second heating coil can be arranged in a loose ring or a close arrangement.

[0023] Furthermore, the dual-medium coupling heating system also includes a burner and a fuel supply unit;

[0024] The present invention has no particular limitation on the type and structure of the burner, and a commercially available burner commonly used in the art may be used.

[0025] The present invention has no particular limitation on the fuel used by the burner, which can be any one of oil fuel, gas fuel or a mixture of oil and gas.

[0026] The fuel supply unit has a functional module and a fuel delivery pipeline; preferably, the functional module is provided with a filtering device, a pressure regulating device, and a fuel metering device for controlling and regulating the fuel supply;

[0027] The fuel enters the burner through the functional module and the fuel delivery pipeline, and after burning in the burner, generates high-temperature flue gas, which enters the furnace of the heating furnace and is used to heat working medium one and working medium two.

[0028] Further preferably, the dual-fluid coupled heating system also includes a waste heat recovery unit; the waste heat recovery unit includes a fan, a cold air duct, an air preheater, and a hot air duct; the air preheater is arranged on the chimney of the heating furnace, and the fan is used to pressurize the cold air and send it into the air preheater through the cold air duct. The cold air is heated by the waste heat of the flue gas discharged from the chimney and enters the burner through the hot air duct to participate in the combustion of the fuel.

[0029] The present invention has no particular limitation on the structure of the air preheater, and any of a tube-in-tube type, a heat pipe type, a plate-fin type or a plate type structure may be adopted.

[0030] The dual-fluid coupling heating system provided by the present invention also includes an automatic control system for controlling and adjusting the opening of the first flue damper and the second flue damper. The control method can be any one of an electric method and a pneumatic method.

[0031] When the heating furnace is used to heat working medium 1 and working medium 2 at the same time, the first flue damper and the second flue damper are opened, and working medium 1 enters the first heating coil from the convection section of the heating furnace, exchanges heat with the high-temperature flue gas outside the first heating coil, and then exits from the radiation section of the heating furnace; working medium 2 enters the second heating coil from the convection section of the heating furnace, exchanges heat with the high-temperature flue gas outside the second heating coil, and then exits from the convection section of the heating furnace; the high-temperature flue gas in the heating furnace exchanges heat with working medium 1 in the first heating coil and working medium 2 in the second heating coil, and then is discharged from the chimney of the heating furnace through the first flue damper and the second flue damper respectively.

[0032] According to the heat requirements of working fluid 1 and working fluid 2, the opening of the first flue damper and the second flue damper are adjusted through the automatic control system to maximize the utilization of flue gas efficiency. When the heat required by working fluid 1 is large and the heat required by working fluid 2 is small, the opening of the first flue damper is increased and the opening of the second flue damper is reduced through the automatic control system to allow more flue gas to flow through the first heating coil; when the heat required by working fluid 1 is small and the heat required by working fluid 2 is large, the opening of the first flue damper is reduced and the opening of the second flue damper is increased through the automatic control system to allow more flue gas to flow through the second heating coil.

[0033] When the heating furnace is only used to heat working medium one, the first flue damper is opened and the second flue damper is closed; when the flue gas heat supply of the heating furnace exceeds the heating demand of working medium one, or the heated temperature of working medium one exceeds the set temperature, the second flue damper is opened to adjust the flue gas heat supply to avoid overheating of working medium one.

[0034] When the heating furnace is only used to heat working medium 2, the first flue damper is closed and the second flue damper is opened; when the flue gas heat supply of the heating furnace exceeds the heating demand of working medium 2, or the heated temperature of working medium 2 exceeds the set temperature, the first flue damper is opened to adjust the flue gas heat supply to avoid overheating of working medium 2.

[0035] Technical effects of the present invention:

[0036] Two groups of heating coils are arranged in the heating furnace, and a single heating furnace can be used to meet the heating requirements of different working fluids, which greatly simplifies the system structure. According to the heat requirements of different working fluids, the flue gas flow is adjusted and controlled by controlling the opening of the first flue damper and the second flue damper to maximize the flue gas efficiency. The whole system has a simple structure, easy operation, and a high degree of automation. It can meet the special working conditions of natural gas processing and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 : A schematic structural diagram of a dual-fluid coupled heating system for natural gas processing according to a first embodiment of the present invention.

[0038] Figure 2 : A schematic structural diagram of a natural gas processing dual-fluid coupled heating system according to a second embodiment of the present invention.

[0039] Description of reference numerals:

[0040] Heating furnace 1; first heating coil 11; second heating coil 12; partition 13; first flue damper 111; second flue damper 121;

[0041] Burner 2;

[0042] Fuel supply unit 3; functional module 31; fuel delivery pipeline 32;

[0043] Waste heat recovery unit 4; fan 41; cold air duct 42; air preheater 43; hot air duct 44. DETAILED DESCRIPTION

[0044] The present invention will now be further described in conjunction with the accompanying drawings, but the following embodiments do not constitute a limitation of the present invention. Figure 1-2 The schematic diagram of the structure of the inorganic working fluid closed cycle skid-mounted power generation system provided by the present invention is shown.

[0045] Example 1

[0046] Figure 1 The schematic diagram of the structure of a dual-fluid coupled heating system for natural gas processing provided by the present invention is shown.

[0047] like Figure 1 As shown, the natural gas processing dual-medium coupled heating system includes a heating furnace 1, a burner 2, a fuel supply unit 3 and an automatic control system;

[0048] The heating furnace 1 has a convection section and a radiation section;

[0049] A first heating coil 11 and a second heating coil 12 are provided in the heating furnace 1. The first heating coil 11 is provided in the convection section and the radiation section of the heating furnace 1; the second heating coil 12 is provided in the convection section of the heating furnace 1;

[0050] A partition 13 is provided between the first heating coil 11 and the second heating coil 12;

[0051] A first flue baffle 111 is provided at the smoke outlet of the first heating coil 11; a second flue baffle 121 is provided at the smoke outlet of the second heating coil 12;

[0052] The first heating coil 11 is used to heat working medium 1; the second heating coil 12 is used to heat working medium 2;

[0053] The working medium 1 enters the first heating coil 11 from the convection section of the heating furnace 1, exchanges heat with the high-temperature flue gas outside the first heating coil 11, and then exits from the radiation section of the heating furnace 1;

[0054] The working medium 2 enters the second heating coil 12 from the convection section of the heating furnace 1, exchanges heat with the high-temperature flue gas outside the second heating coil 12, and then exits the convection section of the heating furnace 1;

[0055] The high-temperature flue gas in the heating furnace 1 exchanges heat with the working medium 1 in the first heating coil 11 and the working medium 2 in the second heating coil 12 , and then is discharged from the chimney of the heating furnace 1 through the first flue baffle 111 and the second flue baffle 121 .

[0056] The present invention has no particular limitation on the furnace body structure of the heating furnace 1 , and the furnace body structure of the heating furnace 1 may be any one of a vertical structure, a horizontal structure, or a horizontal-vertical structure.

[0057] The present invention has no particular limitation on the specific form of the heating coil, which may be a serpentine tube or a spiral tube.

[0058] The present invention has no particular restrictions on the type and structure of the burner 2, and a commercially available burner commonly used in the art is used. The present invention has no particular restrictions on the fuel used by the burner 2, and it can be any one of oil, gas, or a mixture of oil and gas.

[0059] The fuel supply unit 3 includes a functional module 31 and a fuel delivery pipeline 32. The functional module 31 is provided with a filtering device, a pressure regulating device, and a fuel metering device for controlling and regulating the fuel supply. The fuel enters the burner 2 through the functional module 31 and the fuel delivery pipeline 32, and after combustion in the burner 2, generates high-temperature flue gas, which enters the furnace of the heating furnace 1 and is used to heat working medium one and working medium two.

[0060] An automatic control system is used to control and adjust the opening of the first flue damper 111 and the second flue damper 121 .

[0061] When the heating furnace 1 is used to heat working medium 1 and working medium 2 at the same time, the first flue damper 111 and the second flue damper 121 are opened, and working medium 1 enters the first heating coil 11 from the convection section of the heating furnace 1, exchanges heat with the high-temperature flue gas outside the first heating coil 11, and then exits from the radiation section of the heating furnace 1; working medium 2 enters the second heating coil 12 from the convection section of the heating furnace 1, exchanges heat with the high-temperature flue gas outside the second heating coil 12, and then exits from the convection section of the heating furnace 1; the high-temperature flue gas in the heating furnace 1 exchanges heat with working medium 1 in the first heating coil 11 and working medium 2 in the second heating coil 12, and then passes through the first flue damper 111 and the second flue damper 121 respectively, and is discharged from the chimney of the heating furnace 1.

[0062] When the heat required by working fluid one is large and the heat required by working fluid two is small, the opening of the first flue damper 111 is increased and the opening of the second flue damper 121 is reduced through the automatic control system to allow more flue gas to flow through the first heating coil 11; when the heat required by working fluid one is small and the heat required by working fluid two is large, the opening of the first flue damper 111 is reduced and the opening of the second flue damper 121 is increased through the automatic control system to allow more flue gas to flow through the second heating coil 11.

[0063] When the heating furnace 1 is only used to heat working medium 1, the first flue damper 111 is opened and the second flue damper 121 is closed; when the flue gas heat supply of the heating furnace 1 exceeds the heating demand of working medium 1, or the heated temperature of working medium 1 exceeds the set temperature, the second flue damper 121 is opened to adjust the flue gas heat supply to avoid overheating of working medium 1.

[0064] When the heating furnace is only used to heat working medium 2, the first flue damper 111 is closed and the second flue damper 121 is opened; when the flue gas heat supply of the heating furnace 1 exceeds the heating demand of working medium 2, or the heated temperature of working medium 2 exceeds the set temperature, the first flue damper 111 is opened to adjust the flue gas heat supply to avoid overheating of working medium 2.

[0065] Example 2

[0066] Figure 2 It is a structural schematic diagram of another natural gas processing dual-fluid coupled heating system provided by the present invention.

[0067] Compared with Example 1, the difference between the two is that Example 2 further provides a waste heat recovery unit 4.

[0068] The waste heat recovery unit 4 includes a fan 41, a cold air duct 42, an air preheater 43, and a hot air duct 44;

[0069] The air preheater 43 is arranged on the chimney of the heating furnace 1. The fan 41 is used to pressurize the cold air and send it to the air preheater 43 through the cold air duct 42. The cold air is heated by the waste heat discharged from the chimney and enters the burner 2 through the hot air duct 44 to participate in the fuel combustion.

[0070] The present invention has no particular limitation on the structure of the air preheater 43, and any of a tube-in-tube type, a heat pipe type, a plate-fin type or a plate type structure may be adopted.

[0071] By providing the waste heat recovery unit 4, the waste heat of the flue gas can be utilized to the maximum extent, thereby improving the utilization rate of the flue gas efficiency.

[0072] The above are only preferred embodiments of the present invention and should not be construed as being limited to the technical solutions of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual-medium coupled heating system for natural gas processing, comprising a heating furnace, the heating furnace having a convection section and a radiation section, characterized in that: A first heating coil and a second heating coil are arranged in the heating furnace; The first heating coil is arranged in the convection section and the radiation section of the heating furnace; the second heating coil is arranged in the convection section of the heating furnace; A partition is provided between the first heating coil and the second heating coil; A first flue baffle is provided at the smoke outlet of the first heating coil; a second flue baffle is provided at the smoke outlet of the second heating coil; The first heating coil is used to heat working medium 1, and the second heating coil is used to heat working medium 2; The working medium 1 enters the first heating coil from the convection section of the heating furnace 1, exchanges heat with the high-temperature flue gas outside the first heating coil, and then exits from the radiation section of the heating furnace; The second working medium enters the second heating coil from the convection section of the heating furnace, exchanges heat with the high-temperature flue gas outside the second heating coil, and then exits from the convection section of the heating furnace; The high-temperature flue gas in the heating furnace exchanges heat with the working medium 1 in the first heating coil and the working medium 2 in the second heating coil, and then is discharged from the chimney of the heating furnace through the first flue baffle and the second flue baffle.

2. The natural gas processing dual-fluid coupling heating system according to claim 1, characterized in that: The natural gas processing dual-medium coupled heating system also includes an automatic control system for controlling and adjusting the openings of the first flue damper and the second flue damper.

3. The natural gas processing dual-fluid coupling heating system according to claim 2, characterized in that: The automatic control system adopts electric or pneumatic control mode.

4. The dual-medium coupled heating system for natural gas processing according to claim 1, characterized in that: The first heating coil and the second heating coil are any one of a serpentine tube and a spiral tube.

5. The dual-fluid coupled heating system for natural gas processing according to claim 1, characterized in that: The furnace body of the heating furnace is a vertical structure, a horizontal structure or a horizontal-vertical structure.

6. The system according to claim 1, characterized in that The natural gas processing dual-fluid coupled heating system also includes a fuel supply unit, which has a functional module and a fuel delivery pipeline; the functional module is provided with a filtering device, a pressure regulating device, and a fuel metering device for controlling and regulating the fuel supply; the fuel enters the burner through the functional module and the fuel delivery pipeline, and after combustion in the burner, generates high-temperature flue gas, which enters the furnace of the heating furnace and is used to heat working fluid one and working fluid two.

7. The dual-fluid coupled heating system for natural gas processing according to claim 1, characterized in that: The natural gas processing dual-fluid coupled heating system also includes a waste heat recovery unit; the waste heat recovery unit includes a fan, a cold air duct, an air preheater and a hot air duct; the air preheater is arranged on the chimney of the heating furnace, and the fan is used to pressurize the cold air and send it into the air preheater through the cold air duct. The cold air is heated by the waste heat of the flue gas discharged from the chimney and then enters the burner through the hot air duct to participate in the fuel combustion.

8. The natural gas processing dual-fluid coupling heating system according to claim 7, characterized in that: The air preheater is of tube-in-tube type, heat pipe type, plate-fin type or plate type structure.

9. The dual-fluid coupled heating system for natural gas processing according to claim 1, characterized in that: The first heating coil and the second heating coil are respectively used for working fluids with different temperature heating requirements, and the working fluids are heat transfer oil, natural gas, regenerated gas, water, crude oil, refined oil or water-containing crude oil.

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