Self-circulation oil product large-load indirect electric heating equipment and system and application thereof

Abstract

The invention discloses a self-circulation oil product large-load indirect electric heating device and system and application thereof. The device can comprise a heating furnace and at least one electric heater. Wherein at least one electric heater is arranged at the bottom of the heating furnace; a heat exchange coil pipe is arranged in the heating furnace, and a lower feeding pipe opening and an upper discharging pipe opening of the heat exchange coil pipe extend out of the heating furnace; a first temperature control box, a liquid level control box and a valve are arranged on the outer side of the heating furnace, and the first temperature control box and the liquid level control box are communicated with the heating furnace through pipelines; the heating furnace is used for being filled with heat conduction liquid, and the electric heater is used for heating the heat conduction liquid so as to heat an oil product flowing through the upper discharging pipe opening from the lower feeding pipe opening through the heat exchange coil pipe; the first temperature control box is electrically connected with the electric heater to regulate and control the temperature of the heat conduction liquid; the valve is communicated with the liquid level control box and the heating furnace through pipelines, and the liquid level control box is used for detecting the liquid level of heat conduction liquid in the heating furnace so as to adjust the liquid level of the heat conduction liquid.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum refining, and in particular to a self-circulating oil product heavy-load indirect electric heating device, a system and application thereof. Background Art

[0002] With the implementation of the national dual carbon target, the refining industry has launched the goal of increasing the electrification rate. The flame heating furnaces previously used are gradually being replaced by electric heating furnaces. However, the outlet temperature of the flame heating furnace is between 250 and 650°C, the heat load is between 1MW and 100MW, and the heated oil has phase changes. Traditional electric heaters can only heat single-phase (gas or liquid) oil products when directly heated, and the heat load (for a single device) cannot be very large. In order to heat mixed-phase oil products and make the heat load of a single electric heating device very large, the traditional heat transfer liquid heating furnace indirect heating method is adopted; however, this method invisibly adds heat transfer liquid heat exchange equipment, heat transfer liquid circulation pumps and very long high-temperature alloy steel pipelines, which increases project investment. Summary of the invention

[0003] In order to increase the heat load of a single device, while saving equipment such as heat transfer fluid heat exchange equipment, heat transfer fluid circulation pumps, and high-temperature alloy steel pipelines used for connection, and saving project funds, an embodiment of the present invention provides a self-circulating oil high-load indirect electric heating device, system and application thereof.

[0004] In a first aspect, an embodiment of the present invention provides a self-circulating oil product heavy-load indirect electric heating device, which may include: a heating furnace and at least one electric heater;

[0005] Wherein, at least one of the electric heaters is arranged at the bottom of the heating furnace;

[0006] A heat exchange coil is arranged in the heating furnace, and a lower feed pipe opening and an upper discharge pipe opening of the heat exchange coil extend out of the heating furnace; a first temperature control box, a liquid level control box and a valve are arranged on the outside of the heating furnace, and the first temperature control box and the liquid level control box are connected to the heating furnace through pipelines;

[0007] The heating furnace is used to be filled with heat transfer liquid, and the electric heater is used to heat the heat transfer liquid so as to heat the oil flowing from the lower feed pipe to the upper discharge pipe through the heat exchange coil; the first temperature control box is electrically connected to the electric heater so as to regulate the temperature of the heat transfer liquid; the valve is connected to the liquid level control box and the heating furnace through a pipeline, and the liquid level control box is used to detect the liquid level of the heat transfer liquid in the heating furnace so as to adjust the liquid level of the heat transfer liquid.

[0008] Optionally, an air inlet and an air outlet are provided on the top of the heating furnace so that inert gas can be filled into the heating furnace through the air inlet.

[0009] Optionally, the electric heater is used to be connected to an external medium or high voltage power supply, and the voltage of the external medium or high voltage power supply is 4 to 10 kV.

[0010] Optionally, the heat load power of the electric heater is not less than 3 MW.

[0011] Optionally, the self-circulating oil high-load indirect electric heating equipment may also include: a second temperature control box, which is connected to the upper discharge pipe outlet of the heating coil and is electrically connected to the first temperature control box; the second temperature control box is used to detect the temperature of the upper discharge pipe outlet and send it to the first temperature control box, so that the first temperature control box adjusts the electric heater based on the temperature of the heat transfer liquid detected by it and the temperature of the upper discharge pipe outlet detected by the second temperature control box.

[0012] Optionally, the heat transfer fluid is heat transfer oil or molten salt.

[0013] Optionally, the electric heater is at a preset distance from the bottom of the heating furnace.

[0014] Optionally, the self-circulating oil-based heavy-load indirect electric heating equipment may further include: a circulating pump, which is connected to the heating furnace axially and radially through pipelines, respectively, to circulate the heat transfer liquid filled in the heating furnace so that the axial and radial temperature fields of the heat transfer liquid in the heating furnace are uniform.

[0015] In a second aspect, an embodiment of the present invention provides a petroleum refining system, which may include: a feed pipeline subsystem, a discharge pipeline subsystem, a medium- and high-voltage power supply subsystem, and at least one self-circulating oil product heavy-load indirect electric heating device as described in the first aspect;

[0016] Wherein, the feed pipeline subsystem is connected to the lower feed pipe opening of the self-circulating oil product heavy-load indirect electric heating device through a pipeline, so as to supply the processed oil product through the lower feed pipe opening;

[0017] The discharge pipeline subsystem is connected to the upper discharge pipe opening of the self-circulating oil product heavy-load indirect electric heating device through a pipeline, so as to discharge the heated oil product through the upper discharge pipe opening;

[0018] The medium and high voltage power supply subsystem is connected to the electric heater of the self-circulating oil product high-load indirect electric heating equipment to supply power to the electric heater.

[0019] In a third aspect, an embodiment of the present invention provides an application of the self-circulating oil product high-load indirect electric heating device as described in the first aspect in an oil refining system.

[0020] The beneficial effects of the above technical solution provided in the embodiments of the present invention include at least:

[0021] The embodiment of the present invention provides a self-circulating oil product heavy-load indirect electric heating device, system and application thereof. The self-circulating oil product heavy-load indirect electric heating device has at least the following beneficial effects:

[0022] (1) Since the heat transfer fluid has a density difference at different temperatures, it will realize the internal self-circulation of the heating furnace, and there is no need to equip a circulation pump for the upper and lower circulation, thus saving the cost of the circulation pump;

[0023] (2) Indirect heating of oil products, without considering the state of the oil products, can achieve the treatment of mixed-phase oil products, solving the long-term drawbacks of single-phase (gas or liquid) treatment in the prior art;

[0024] (3) The indirect heating method of the oil product eliminates direct contact between the electric heater and the oil product, and the electric heater is no longer prone to coking, thus protecting the equipment and saving costs;

[0025] (4) The power of a single electric heater is no longer limited, the power can be very large, and one or several high-power devices can meet the needs, saving floor space.

[0026] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0027] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a structural diagram of a self-circulating oil product heavy-load indirect electric heating device provided in an embodiment of the present invention;

[0030] Figure 2 This is an architecture diagram of a petroleum refining system provided in an embodiment of the present invention;

[0031] Among them, 1-self-circulating oil product large-load indirect electric heating equipment; 2-heat transfer fluid; 3-feed pipeline subsystem; 4-discharge pipeline subsystem; 5-medium and high voltage power supply subsystem;

[0032] 11-heating furnace; 12-electric heater; 13-heat exchange coil; 14-lower feed pipe opening; 15-upper discharge pipe opening; 16-first temperature control box; 17-liquid level control box; 18-valve; 19-second temperature control box;

[0033] 111-air inlet; 112-air outlet. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "far", "near", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In order to reduce the engineering investment cost, enrich the process route and increase the selection space, a self-circulating oil product large-load indirect electric heating device is proposed in the embodiment of the present invention. Figure 1As shown, the self-circulating oil product heavy-load indirect electric heating device 1 may include: a heating furnace 11 and at least one electric heater 12; wherein, at least one electric heater 12 is arranged at the bottom of the heating furnace 11; a heat exchange coil 13 is arranged in the heating furnace 11, and a lower feed pipe opening 14 and an upper discharge pipe opening 15 of the heat exchange coil 13 extend out of the heating furnace; a first temperature control box 16, a liquid level control box 17 and a valve 18 are arranged on the outside of the heating furnace 11, and the first temperature control box 16 and the liquid level control box 17 are connected to the heating furnace 11 through pipelines. The heating furnace 11 is used to be filled with heat transfer liquid 2, and the electric heater 11 is used to heat the heat transfer liquid 2, so as to heat the oil product flowing from the lower feed pipe port 14 to the upper discharge pipe port 15 through the heat exchange coil 13; the first temperature control box 16 is electrically connected to the electric heater 12 to adjust the temperature of the heat transfer liquid 2; the valve 18 is connected to the liquid level control box 17 and the heating furnace 11 through a pipeline, and the liquid level control box 17 is used to detect the liquid level of the heat transfer liquid 2 in the heating furnace to adjust the liquid level of the heat transfer liquid 2.

[0038] It should be noted that the valve in this embodiment may be a pneumatic solenoid valve, which is used to receive control instructions from a liquid level control box to discharge the heat transfer liquid in the heating furnace to a preset liquid level.

[0039] The working principle of the above-mentioned self-circulating oil product heavy-load indirect electric heating equipment provided in the embodiment of the present invention is as follows: the heat transfer liquid is filled in the heating furnace, and the heat transfer liquid is heated by the electric heater. Since the density of the heat transfer liquid decreases after heating, the heat transfer liquid will produce a density difference at different temperatures to realize the internal self-circulation of the heating furnace; in the process of the processed oil product flowing from the lower feed pipe opening of the heat exchange coil to the upper discharge pipe opening, the oil product in the pipe is indirectly heated by the heat exchange coil. During the operation, the temperature of the heat transfer liquid can be adjusted by the first temperature control box, the liquid level of the heat transfer liquid in the heating furnace can be adjusted by the liquid level control box, and the liquid level flow rate can be adjusted by the valve, so that the heating furnace operates under negative pressure conditions.

[0040] The above-mentioned self-circulating oil product heavy-load indirect electric heating device provided in the embodiment of the present invention has at least the following beneficial effects:

[0041] (1) Since the heat transfer fluid has a density difference at different temperatures, it will realize the internal self-circulation of the heating furnace, and there is no need to equip a circulation pump for the upper and lower circulation, which saves the cost of the circulation pump;

[0042] (2) Indirect heating of oil products, without considering the state of the oil products, can achieve the treatment of mixed-phase oil products, solving the long-term drawbacks of single-phase (gas or liquid) treatment in the prior art;

[0043] (3) The indirect heating method of the oil product eliminates direct contact between the electric heater and the oil product, and the electric heater is no longer prone to coking, thus protecting the equipment and saving costs;

[0044] (4) The power of a single electric heater is no longer limited, the power can be very large, and one or several high-power devices can meet the needs, saving floor space.

[0045] The effects of the indirect heating method of the self-circulating oil heavy-load indirect electric heating equipment in this embodiment compared with the radiation heating and direct contact heating in the prior art are as follows:

[0046]

[0047] In an alternative embodiment, referring to Figure 1 As shown, the top of the heating furnace is provided with an air inlet 111 and an air outlet 112, so that inert gas can be filled into the heating furnace through the air inlet. The inert gas in the embodiment of the present invention can be nitrogen, which is used to protect the heat transfer fluid from being oxidized and destroyed by oxygen in the air.

[0048] In another optional embodiment, the electric heater is used to connect to an external medium-high voltage power supply, and the voltage of the external medium-high voltage power supply is 4-10 kV. The external power supply in the embodiment of the present invention adopts a medium-high voltage power supply, so that the diameter of the power line can use a small diameter power line, saving the space occupied by the equipment.

[0049] In another optional embodiment, the heat load power of the electric heater is not less than 3MW. In this embodiment, a high-power electric heater is used to reduce the number of low-power electric heaters. If a 100MW electric heater is used, the number of electric heaters can be controlled within the single digit, which greatly saves engineering space.

[0050] In another optional embodiment, also refer to Figure 1 As shown, the above-mentioned self-circulating oil high-load indirect electric heating equipment 1 can also include: a second temperature control box 19, which is connected to the upper discharge pipe 15 of the heating coil 13 and is electrically connected to the first temperature control box 16; the second temperature control box 19 is used to detect the temperature of the upper discharge pipe 15 and send it to the first temperature control box 16, so that the first temperature control box 16 adjusts the electric heater 12 based on the temperature of the heat transfer liquid 2 detected by it and the temperature of the upper discharge pipe 15 detected by the second temperature control box 19.

[0051] In another optional embodiment, the heat transfer fluid is heat transfer oil or molten salt. In this embodiment, the heat transfer fluid such as molten salt, which is difficult to transport at low temperature, does not need to be transported over a long distance and only needs to be kept in the heating furnace.

[0052] In another optional embodiment, the electric heater is at a preset distance from the bottom of the heating furnace.

[0053] In another optional embodiment, the above-mentioned self-circulating oil product heavy-load indirect electric heating equipment may also include: a circulation pump (not shown in the figure), which is connected to the axial and radial directions of the heating furnace through pipelines to circulate the heat transfer liquid filled in the heating furnace so that the axial and radial temperature fields of the heat transfer liquid in the heating furnace are uniform. The circulation pump in this embodiment can make the axial and radial temperature fields of the heating furnace more uniform. Since the heat transfer liquid in the upper and lower directions of the heating furnace will self-circulate due to the density difference, there is no need to set a vertical circulation pump, which saves costs.

[0054] In a specific example, a heating furnace in a certain oil refinery has a furnace heat load of 75.80MW, the inlet temperature of the heated heavy oil furnace is 352.6℃, the outlet is 427.1℃, the gasification rate out of the furnace is 15.60% (wt), the heated heavy oil contains colloids, asphaltene, and polycyclic aromatic hydrocarbons, which are very easy to coke at high temperature. The inlet pressure of the furnace tube is 694.9mbara, and the outlet is 748.5mbara, which is a negative pressure operation. Combined with the characteristics that the heated heavy oil in the furnace tube is very easy to coke, the outlet temperature is 427.1℃, which is too high, and the furnace heat load is 75.80MW, which is too large, the method of using electric heaters to directly heat the pure liquid phase heat transfer liquid and indirectly heat the oil (mixed phase) can solve the above problems well. 8 10MW electric heaters are installed in the heating furnace, and the heated heavy oil can be installed in parallel with 288 DN200 heat exchange tubes according to the mass flow rate of the tube.

[0055] Based on the same inventive concept, an oil refining system is also provided in the embodiment of the present invention. Figure 2 As shown, the system may include: a feed pipeline subsystem 3, a discharge pipeline subsystem 4, a medium and high voltage power supply subsystem 5 and at least one of the above-mentioned self-circulating oil product heavy load indirect electric heating devices 1; wherein, in combination with Figure 1 As shown, the feed pipeline subsystem 3 is connected with the lower feed pipe opening 14 of the self-circulating oil product large-load indirect electric heating equipment 1 through a pipeline, so as to supply the processed oil product through the lower feed pipe opening 14; the discharge pipeline subsystem 4 is connected with the upper discharge pipe opening 15 of the self-circulating oil product large-load indirect electric heating equipment 1 through a pipeline, so as to discharge the heated oil product through the upper discharge pipe opening 15; the medium and high voltage power supply subsystem 5 is connected with the electric heater 12 of the self-circulating oil product large-load indirect electric heating equipment 1, so as to supply power to the electric heater 12.

[0056] Based on the same inventive concept, an embodiment of the present invention also provides an application of the above-mentioned self-circulating oil product high-load indirect electric heating equipment in a petroleum refining system.

[0057] The principles of the problems solved by the application of the above-mentioned system and the self-circulating oil product heavy-load indirect electric heating equipment in the oil refining system in the embodiments of the present invention are similar to those of the aforementioned self-circulating oil product heavy-load indirect electric heating equipment. Therefore, its implementation can refer to the implementation of the aforementioned equipment, and the repeated parts will not be repeated.

[0058] Obviously, various changes and modifications may be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. The present disclosure is not limited to the precise structure described above and shown in the accompanying drawings, and various changes and modifications may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims. Thus, if these changes and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A self-circulating oil product heavy load indirect electric heating device, characterized in that: include: a heating furnace and at least one electric heater; Wherein, at least one of the electric heaters is arranged at the bottom of the heating furnace; A heat exchange coil is arranged in the heating furnace, and a lower feed pipe opening and an upper discharge pipe opening of the heat exchange coil extend out of the heating furnace; a first temperature control box, a liquid level control box and a valve are arranged on the outside of the heating furnace, and the first temperature control box and the liquid level control box are connected to the heating furnace through pipelines; The heating furnace is used to be filled with heat transfer liquid, and the electric heater is used to heat the heat transfer liquid so as to heat the oil flowing from the lower feed pipe to the upper discharge pipe through the heat exchange coil; the first temperature control box is electrically connected to the electric heater so as to regulate the temperature of the heat transfer liquid; the valve is connected to the liquid level control box and the heating furnace through a pipeline, and the liquid level control box is used to detect the liquid level of the heat transfer liquid in the heating furnace so as to adjust the liquid level of the heat transfer liquid.

2. The device according to claim 1, characterized in that The top of the heating furnace is provided with an air inlet and an air outlet, so that inert gas can be filled into the heating furnace through the air inlet.

3. The device according to claim 1, characterized in that The electric heater is used to be connected to an external medium or high voltage power supply, and the voltage of the external medium or high voltage power supply is 4-10 kV.

4. The device according to claim 3, characterized in that The heat load power of the electric heater is not less than 3MW.

5. The device according to claim 1, characterized in that Also includes: A second temperature control box is connected to the upper discharge pipe outlet of the heating coil and is electrically connected to the first temperature control box; the second temperature control box is used to detect the temperature of the upper discharge pipe outlet and send it to the first temperature control box, so that the first temperature control box adjusts the electric heater based on the temperature of the heat transfer liquid detected by it and the temperature of the upper discharge pipe outlet detected by the second temperature control box.

6. The device according to any one of claims 1 to 5, characterized in that: The heat transfer fluid is heat transfer oil or molten salt.

7. The device according to any one of claims 1 to 5, characterized in that The electric heater is at a preset distance from the furnace bottom of the heating furnace.

8. The device according to any one of claims 1 to 5, characterized in that Also includes: A circulation pump is connected to the heating furnace in the axial direction and the radial direction through pipelines to circulate the heat transfer liquid filled in the heating furnace so that the axial and radial temperature fields of the heat transfer liquid in the heating furnace are uniform.

9. A petroleum refining system, characterized in that: include: A feed pipeline subsystem, a discharge pipeline subsystem, a medium- and high-voltage power supply subsystem, and at least one self-circulating oil product heavy-load indirect electric heating device as claimed in any one of claims 1 to 8; Wherein, the feed pipeline subsystem is connected to the lower feed pipe opening of the self-circulating oil product heavy-load indirect electric heating device through a pipeline, so as to supply the processed oil product through the lower feed pipe opening; The discharge pipeline subsystem is connected to the upper discharge pipe opening of the self-circulating oil product heavy-load indirect electric heating device through a pipeline, so as to discharge the heated oil product through the upper discharge pipe opening; The medium and high voltage power supply subsystem is connected to the electric heater of the self-circulating oil product high-load indirect electric heating equipment to supply power to the electric heater.

10. Use of the self-circulating oil product heavy-load indirect electric heating device according to any one of claims 1 to 8 in an oil refining system.

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