Multi-group tandem type electric heat-conducting oil furnace and heat-conducting oil furnace system

Abstract

The utility model relates to the field of oil field surface engineering, in particular to a multi-group tandem type electric heat-conducting oil furnace and a heat-conducting oil furnace system. The problems that an existing electric heat-conducting oil furnace is prone to heat-conducting oil cracking and uneven in heating are mainly solved. The multi-group tandem type electric heat conduction oil furnace comprises a plurality of heating cylinders (3), baffle plates (2) are arranged on the inner walls of the heating cylinders (3), the end of each heating cylinder (3) is connected with an electric heater (1), every two adjacent heating cylinders (3) are connected through a connecting pipe (4), the first heating cylinder (3) is connected with a medium inlet connecting pipe (7), and the last heating cylinder (3) is connected with a medium outlet connecting pipe (6). According to the multi-group tandem type electric heat-conducting oil furnace and the heat-conducting oil furnace system, uniform heating distribution can be ensured, the flowing speed of a heating medium is increased, and the phenomenon of heat-conducting oil coking caused by local overtemperature is avoided.

Description

Technical Field

[0001] The utility model relates to the field of oil field surface engineering, in particular to a plurality of series-connected electric heat-conducting oil furnaces and a heat-conducting oil furnace system. Background Art

[0002] The commonly used electric thermal oil furnaces have a large surface load on the heating tubes, resulting in local high temperatures and the occurrence of thermal oil cracking. During the operation of the equipment, gas phase phenomena occur at high points in the furnace to varying degrees, accelerating the cracking of the thermal oil. At the same time, the flow rate of the heater in the cylinder connected in parallel with the thermal oil furnace is not good, resulting in a sudden increase in heat at a certain point, unstable flow, and inability to heat evenly. Summary of the invention

[0003] In order to overcome the shortcomings of existing electric thermal oil furnaces that are prone to thermal oil cracking and uneven heating, the utility model provides a plurality of series-connected electric thermal oil furnaces and a thermal oil furnace system, which can ensure uniform heating distribution, increase the flow rate of the heating medium, and avoid local overheating and the occurrence of thermal oil coking.

[0004] The technical solution of the utility model is: a multi-group series electric thermal oil furnace, including a plurality of heating cylinders, a baffle is provided on the inner wall of the heating cylinder, each heating cylinder end is respectively connected to an electric heater, two adjacent heating cylinders are connected by a connecting pipe, wherein the first heating cylinder is connected to a medium inlet pipe, and the last heating cylinder is connected to a medium outlet pipe.

[0005] Furthermore, the baffle includes an upper plate and a lower plate arranged alternately, wherein the top of the upper plate is fixed to the inner wall of the top of the heating tube, and there is a gap between the lower end of the upper plate and the inner wall of the bottom of the heating tube; the bottom of the lower plate is fixed to the inner wall of the bottom of the heating tube, and there is a gap between the upper end of the lower plate and the inner wall of the top of the heating tube.

[0006] Furthermore, the heating tube is a horizontally placed long tube with a feed port and a discharge port respectively located at both ends of the heating tube, and the connecting pipe is connected between the discharge port of the previous heating tube and the feed port of the next heating tube.

[0007] Furthermore, the feed port is located at the bottom of the heating cylinder, and the discharge port is located at the top of the heating cylinder.

[0008] Furthermore, a thermometer and an alarm are provided inside the discharge port of the heating cylinder.

[0009] A thermal oil furnace system using the multiple groups of series-connected electric thermal oil furnaces comprises an electric thermal oil furnace, wherein the feed port of the electric thermal oil furnace is connected to a high-position tank, the outlet of the electric thermal oil furnace is connected to an air-cooled centrifugal pump, and the air-cooled centrifugal pump is connected to the thermal oil tank through a filter; the high-position tank is connected to a low-position tank, and a circulation pump, a radiator and an oil return pump are sequentially connected between the low-position tank and the thermal oil tank.

[0010] Furthermore, a separator is provided between the inlet of the electric thermal oil furnace and the high-position tank.

[0011] Furthermore, an expansion joint is provided between the air-cooled centrifugal pump and the filter.

[0012] Furthermore, the air-cooled centrifugal pumps are connected in parallel in several groups, the filters are connected in parallel in several groups, and each filter inlet is provided with an expansion joint.

[0013] The utility model has the following beneficial effects: due to the adoption of the above scheme, the electric thermal oil furnace adopts multiple heating tubes in series, and the electric heaters on each heating tube are individually controlled according to the needs, so that the heating distribution is uniform, and the phenomenon of thermal oil coking due to local overheating is avoided. At the same time, the electric thermal oil furnace effectively improves the flow state of the heating medium, improves the heat exchange efficiency, increases the internal space of the heating tube, increases the flow speed of the heating medium, enhances the heat exchange performance, and has the characteristics of fast direct heating start-up, high thermal efficiency, easy temperature adjustment, and prevention of coking. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of multiple groups of series-connected electric thermal oil furnaces in the utility model;

[0015] Figure 2 It is a schematic diagram of the thermal oil furnace system.

[0016] In the figure, 1-electric heater, 2-baffle, 3-heating cylinder, 4-connecting pipe, 5-bracket, 6-medium outlet pipe, 7-medium inlet pipe, 10-circulation pump, 11-radiator, 12-return oil pump, 13-electric thermal oil furnace, 14-separator, 15-high-level tank, 16-low-level tank, 17-air-cooled centrifugal pump, 18-expansion joint, 19-filter, 20-thermal oil tank. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by "up", "down", "left", "right", "inside", "outside", "top" and "bottom" are all based on the directions or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0019] Depend on Figure 1 As shown, a multi-group series electric thermal oil furnace includes several heating tubes 3, each end of each heating tube 3 is connected to an electric heater 1, the heating tube 3 is made of 20G steel plate, and has excellent corrosion resistance and thermal conductivity; the electric heater 1 is arranged in the heating tube 3, and is composed of multiple groups of winding electric heating elements and a junction box. The heating element is composed of materials such as resistance wire, silicon carbon rod, ceramic tube, etc., and has the characteristics of good heating effect, high thermal energy utilization rate, and long service life. The bottom of each heating tube 3 is fixed by a bracket 5. Under the condition of ensuring strength, the bracket 5 can be fixed on the outer surface of the previous heating tube 3. Several heating tubes 3 are connected in series, and two adjacent heating tubes 3 are connected by a connecting pipe 4, that is, the discharge port of the first heating tube is connected to the feed port of the second heating tube, and the discharge port of the second heating tube is connected to the feed port of the third heating tube. By analogy, the feed port of the first heating tube is connected to the medium inlet pipe 7, and the discharge port of the last heating tube is connected to the medium outlet pipe 6. The heating cylinder 3 is a horizontally placed long cylinder, with the feed port and the discharge port located at both ends of the heating cylinder 3, and the heating cylinder adopts the form of bottom-in and top-out, that is, the feed port is located at the bottom of the heating cylinder 3, and the discharge port is located at the top of the heating cylinder 3. The connecting pipe 4 is connected between the discharge port of the previous heating cylinder and the feed port of the next heating cylinder. A thermometer and an alarm are provided inside the discharge port of the heating cylinder 3, which can accurately control the surface heat load of the electric heating core.

[0020] The inner wall of the heating cylinder 3 is provided with a baffle 2, and the baffle 2 comprises a plurality of upper plates and lower plates, which are arranged alternately, wherein the top of the upper plate is fixed to the inner wall of the top of the heating cylinder 3, and there is a gap between the lower end of the upper plate and the inner wall of the bottom of the heating cylinder 3; the bottom of the lower plate is fixed to the inner wall of the bottom of the heating cylinder 3, and there is a gap between the upper end of the lower plate and the inner wall of the top of the heating cylinder 3. The baffle 2 is made of corrosion-resistant and high-temperature resistant materials, providing reliable baffle support for the heating cylinder, effectively improving the flow state of the heating medium, improving the heat exchange efficiency, and can also increase the internal space of the heating cylinder, increase the flow speed of the heating medium, enhance the heat exchange performance, and avoid local over-temperature and the coking of the heat transfer oil.

[0021] The multi-group series electric thermal oil furnace adopts a structure in which multiple heating cylinders are connected in series. A thermometer and an alarm are provided inside the discharge port of each heating cylinder 3. Each electric heater can be controlled individually. The final outlet temperature is used as the control point. The deviation between the final outlet temperature value and the set value is detected. The temperature controller adjusts the output power of the thermal oil furnace heater according to the deviation value. When controlling the output power of the thermal oil furnace, the heating cores of multiple heating cylinders are staggered to prevent the situation in which all the heating cores of one cylinder are started while the heating cores of other heating cylinders are not started. This ensures that the heating distribution of the entire thermal oil furnace is uniform and avoids local over-temperature and the coking of the thermal oil. The temperature inside the heating cylinder can be monitored by the control system, and an over-temperature alarm is issued when the temperature is too high, so that the surface heat load of the electric heating core can be accurately controlled.

[0022] Depend on Figure 2 As shown, a thermal oil furnace system using the multiple groups of series-connected electric thermal oil furnaces includes an electric thermal oil furnace 13, the feed port of the electric thermal oil furnace 13 is connected to a high-level tank 15, and a separator 14 is provided between the electric thermal oil furnace 13 and the high-level tank 15. The outlet of the electric thermal oil furnace 13 is connected to an air-cooled centrifugal pump 17, and the air-cooled centrifugal pump 17 is connected to a thermal oil tank 20 through a filter 19. The air-cooled centrifugal pump 17 can be connected in parallel in several groups, and the filters 19 can also be connected in parallel in several groups. An expansion joint 18 is provided between the filter 19 and the air-cooled centrifugal pump 19, and the expansion joint 18 can be provided at the inlet of the filter 19. The high-position tank 15 is connected to the low-position tank 16. The high-position tank 15 and the low-position tank 16 are containers for storing thermal oil. The high-position tank 15 is usually located upstream of the system, and the low-position tank 16 is usually located downstream of the system. The air-cooled centrifugal pump 17 transports the thermal oil from the low-position tank 16 to the high-position tank 15, and then from the high-position tank 15 to the low-position tank 16 to realize oil circulation. The circulation pump 10, the radiator 11 and the return oil pump 12 are connected in sequence between the low-position tank 16 and the thermal oil tank 20. The circulation pump 10, the radiator 11 and the return oil pump 12 together constitute a cooling system to discharge the heat generated by the thermal oil from the heating element to keep the oil temperature stable.

[0023] The separator 14 can separate the gas and moisture, impurities or harmful substances in the oil, so as to make the oil purer and keep the system clean and safe. The air-cooled centrifugal pump 17 uses air-cooling technology to dissipate heat, which is suitable for high temperature and high humidity environments. The filter 19 is used to filter impurities and particles in the thermal oil to maintain the cleanliness of the thermal oil, extend the service life of the thermal oil and ensure the normal operation of the system; the expansion joint 18 is used to absorb the thermal expansion and vibration in the pipeline to protect the pipeline from damage.

[0024] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A multi-group series-connected electric thermal oil furnace, comprising a plurality of heating cylinders (3), characterized in that: A baffle (2) is provided on the inner wall of the heating cylinder (3), and each end of the heating cylinder (3) is connected to an electric heater (1). Two adjacent heating cylinders (3) are connected via a connecting pipe (4), wherein the first heating cylinder (3) is connected to a medium inlet pipe (7), and the last heating cylinder (3) is connected to a medium outlet pipe (6).

2. The multiple series-connected electric thermal oil furnaces according to claim 1 are characterized in that: The baffle plate (2) comprises an upper plate and a lower plate which are arranged alternately, wherein the top of the upper plate is fixed to the top inner wall of the heating cylinder (3), and a gap is provided between the lower end of the upper plate and the bottom inner wall of the heating cylinder (3); and the bottom of the lower plate is fixed to the bottom inner wall of the heating cylinder (3), and a gap is provided between the upper end of the lower plate and the top inner wall of the heating cylinder (3).

3. The multiple series-connected electric thermal oil furnaces according to claim 1 are characterized in that: The heating cylinder (3) is in the shape of a long cylinder placed horizontally, and is provided with a feed port and a discharge port, and the feed port and the discharge port are respectively located at two ends of the heating cylinder (3), and the connecting pipe (4) is connected between the discharge port of the preceding heating cylinder and the feed port of the following heating cylinder.

4. The multiple series-connected electric thermal oil furnaces according to claim 3 are characterized in that: The feed inlet is located at the bottom of the heating cylinder (3), and the discharge outlet is located at the top of the heating cylinder (3).

5. The multiple series-connected electric thermal oil furnaces according to claim 4 are characterized in that: A thermometer and an alarm are provided inside the discharge port of the heating cylinder (3).

6. A thermal oil furnace system using a plurality of series-connected electric thermal oil furnaces according to any one of claims 1 to 5, comprising an electric thermal oil furnace (13), characterized in that: The feed inlet of the electric thermal oil furnace (13) is connected to a high-position tank (15), the outlet of the electric thermal oil furnace (13) is connected to an air-cooled centrifugal pump (17), and the air-cooled centrifugal pump (17) is connected to a thermal oil tank (20) via a filter (19); the high-position tank (15) is connected to a low-position tank (16), and a circulation pump (10), a radiator (11) and an oil return pump (12) are sequentially connected between the low-position tank (16) and the thermal oil tank (20).

7. The thermal oil furnace system according to claim 6, characterized in that: A separator (14) is provided between the inlet of the electric thermal oil furnace (13) and the high-level tank (15).

8. The thermal oil furnace system according to claim 7, characterized in that: An expansion joint (18) is provided between the air-cooled centrifugal pump (17) and the filter (19).

9. The thermal oil furnace system according to claim 8, characterized in that: The air-cooled centrifugal pumps (17) are connected in parallel in a plurality of groups, the filters (19) are connected in parallel in a plurality of groups, and an expansion joint (18) is provided at the inlet of each filter (19).

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