Scale-inhibiting and anti-blocking type efficient oil field heating furnace and control method thereof

Abstract

The invention discloses a scale-inhibiting and anti-blocking type efficient oil field heating furnace and a control method thereof. The scale-inhibiting and anti-blocking type efficient oil field heating furnace comprises a heating furnace shell, a liquid outlet pipe and a liquid inlet pipe are arranged at one end of the heating furnace shell, a sleeve shell is arranged in the heating furnace shell, a sleeve liquid inlet is formed in the top of the sleeve shell, a sleeve liquid outlet is formed in the bottom of the sleeve shell, and a smoke pipe and a fire pipe are arranged in the sleeve shell. The scale inhibitor has obvious scale inhibition and prevention effects. The running frequency of the circulating pump is controlled through the real-time smoke temperature data acquired by the smoke exhaust temperature instrument, so that the smoke exhaust temperature is in a better range, the heating furnace can be ensured to have higher heat efficiency, and the corrosion damage risk of the smoke box and the chimney caused by the too low smoke exhaust temperature can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield heating furnaces, and particularly relates to a scale and blockage prevention type high-efficiency oilfield heating furnace and a control method thereof. Background Art

[0002] In crude oil extraction, in the process of crude oil gathering and transportation, it is necessary to heat the crude oil and oily sewage to the temperature required by the process, so as to facilitate subsequent transportation, sedimentation, separation, dehydration, water blending, hot washing and primary processing of crude oil, etc. The heating process mainly adopts a heating furnace device. The heating furnace mainly uses natural gas as fuel. The fuel combustion releases a large amount of heat energy and generates high-temperature flue gas. After the high-temperature flue gas heats the liquid medium, it is discharged from the chimney. This kind of oilfield heating furnace is widely used in each oil production plant of oilfields.

[0003] Due to the complex composition of the heated medium - furnace water, and containing a certain proportion of crude oil, and affected by the structure of the traditional heating furnace body, the flow rate of the furnace water outside the smoke and fire tubes is relatively low. Large-particle dirt in the furnace water is very easy to deposit on the tube wall and adhere to the tube wall. At the same time, in a long-term high-temperature environment, hard scale will quickly form. These scale not only increase the heat transfer resistance of the heating furnace, reduce the thermal efficiency of the heating furnace, and increase the production fuel consumption cost, but also, when the dirt volume is large, it will cause the local tube wall temperature to be too high, and thus trigger an accident of the heating furnace burning through and leaking liquid; in addition, these scale cannot be treated online and can only be treated by regular dredging. In many cases, only some relatively loose dirt on the surface can be removed, and the hard dirt inside cannot be cleaned. This not only involves high maintenance costs and the impact of furnace shutdown on oil production, but also cannot solve the problem of the heating furnace operating under high heat resistance and low efficiency in the future. This long-term high-energy-consuming state undoubtedly generates more operating costs and brings serious environmental pollution problems.

[0004] Therefore, it is necessary to propose a scale and blockage prevention type high-efficiency oilfield heating furnace and a control method thereof to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a scale and blockage prevention type high-efficiency oilfield heating furnace and a control method thereof for the deficiencies of the prior art, so as to solve the problem of scale formation on the outer walls of the smoke tubes and fire tubes of the existing heating furnace.

[0006] In the first aspect, the present invention provides a scale and blockage prevention type high-efficiency oilfield heating furnace, including: a heating furnace housing, an outlet pipe and an inlet pipe are arranged at one end of the heating furnace housing, a sleeve housing is arranged inside the heating furnace housing, a sleeve inlet is arranged at the top of the sleeve housing, a sleeve outlet is arranged at the bottom of the sleeve housing, and a smoke tube and a fire tube are arranged inside the sleeve housing;

[0007] A liquid extraction pipe is arranged inside the heating furnace shell. The liquid outlet of the sleeve is communicated with the water space inside the furnace. The water space inside the furnace is communicated with the inlet of the liquid extraction pipe. The outlet of the liquid extraction pipe is communicated with the inlet of the circulation pump. The outlet of the circulation pump is communicated with the inlet of the liquid return pipe. The outlet of the liquid return pipe is communicated with the liquid inlet of the sleeve. The liquid inlet of the sleeve is located in the outlet area of the smoke pipe. The liquid outlet of the sleeve is located in the inlet area of the fire pipe. The outlet of the chemical dosing tank is communicated with the liquid extraction pipe, and the connection point of the two pipes is located in the inlet area of the circulation pump.

[0008] Further, a first partition board, a second partition board and a third partition board are arranged inside the heating furnace shell, and the first partition board, the second partition board and the third partition board are sequentially arranged along the liquid outlet direction between the liquid outlet pipe and the sleeve shell.

[0009] Further, a pump inlet pressure gauge is arranged on the liquid extraction pipe in the inlet area of the circulation pump.

[0010] Further, a pump outlet pressure gauge and a liquid flowmeter are arranged on the liquid return pipe in the outlet area of the circulation pump.

[0011] Further, an electric cut-off valve is arranged on the outlet pipe of the chemical dosing tank.

[0012] Further, a smoke box is arranged at the end of the heating furnace shell. The smoke box is communicated with the smoke pipe, and a chimney is connected above the smoke box. The smoke box is provided with an explosion-proof door, and a smoke exhaust temperature gauge and a drain outlet are arranged on the smoke box.

[0013] Further, an oil collection port and a maintenance manhole door are arranged on the heating furnace shell.

[0014] Further, a burner is arranged at the end of the heating furnace shell. The burner is communicated with the fire pipe, and the burner is connected with a gas pipe.

[0015] Further, a blowdown port is arranged at the bottom of the heating furnace shell, and a safety valve interface is arranged at the top of the heating furnace shell.

[0016] In a second aspect, the present invention provides a control method for a scale and blockage prevention type high-efficiency oilfield heating furnace, which is applied to the scale and blockage prevention type high-efficiency oilfield heating furnace described above. The method includes:

[0017] Obtain real-time smoke exhaust temperature data;

[0018] Judge whether the actual smoke temperature is equal to the threshold median value;

[0019] If they are equal, keep the current frequency of the circulation pump;

[0020] If not equal, determine the relationship between the actual flue gas temperature and the upper and lower threshold values; if the actual flue gas temperature is greater than the upper threshold value, increase the frequency of the circulation pump, and re-acquire the real-time exhaust gas temperature data after a set delay; if the actual flue gas temperature is less than the lower threshold value, decrease the frequency of the circulation pump, and re-acquire the real-time exhaust gas temperature data after a set delay;

[0021] Obtain the real-time hydraulic pressure difference data of the pump inlet and outlet;

[0022] Determine whether the actual pressure difference is equal to the set pressure difference;

[0023] If they are equal, check whether the system has been operating without chemical addition for 8 consecutive hours; if so, open the electric cut-off valve and close it after a 5-minute delay; if not, maintain the current state and continue monitoring;

[0024] If they are not equal, determine whether the actual pressure difference is lower than the lower limit of the pressure difference; if it is lower than the lower limit, trigger a warning for furnace tube burnout and leakage, and interlock to shut down the combustion system and the circulation pump; if it is not lower than the lower limit, determine whether the actual pressure difference is higher than the upper limit of the pressure difference; if it is higher than the upper limit, trigger a warning for furnace tube scaling and open the electric cut-off valve, and then monitor the actual pressure difference; when the actual pressure difference returns to the set pressure difference, close the electric cut-off valve; if it does not recover, keep the electric cut-off valve open and continue monitoring

[0025] The present invention has the following beneficial effects: The scale and blockage prevention type high-efficiency oilfield heating furnace provided by the present invention significantly improves the flow rate of the furnace water on the surface of the furnace tube, and has a significant scale and fouling prevention effect; there is a higher convective heat transfer coefficient between the furnace water and the furnace tube, which can effectively improve the operating thermal efficiency of the heating furnace and the comprehensive utilization rate of gas; the outside of the furnace tube adopts a sealed sleeve structure, which enables the scale inhibitor to better play the role of scale prevention, and avoids the problem that the scale inhibitor dissolves in the large volume of water in the furnace and its concentration decreases, resulting in the failure of the scale prevention effect; the high heat transfer rate can quickly respond to the requirements of the oil production process parameter changes, making the regulation of the heating furnace better; the online scale prevention method avoids the problem of regular furnace shutdown and sludge cleaning of conventional heating furnaces, reduces the operation and maintenance cost, and avoids the impact of furnace shutdown on oil production; through the parameters of the external circulation system, the operating state of the furnace tube surface is monitored in real time online, providing a favorable guarantee for the safe, stable and efficient operation of the heating furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the scale and blockage prevention type high-efficiency oilfield heating furnace of the present invention;

[0028] Figure 2 It is the logic flow chart for regulating the circulating liquid volume of the scale and blockage prevention type high-efficiency oilfield heating furnace control method of the present invention;

[0029] Figure 3 It is the logic flow chart for regulating the scale prevention, blockage prevention and safety warning system of the heating furnace of the scale and blockage prevention type high-efficiency oilfield heating furnace control method of the present invention.

[0030] Illustration: 1 - liquid outlet pipe; 2 - liquid inlet pipe; 3 - heating furnace shell; 5 - oil collection port; 6 - liquid extraction pipe; 7 - chemical dosing tank; 8 - pump inlet pressure gauge; 9 - circulation pump; 10 - pump outlet pressure gauge; 11 - liquid flowmeter; 12 - return liquid pipe; 13 - casing inlet; 14 - casing shell; 15 - flue pipe; 16 - fire tube; 17 - casing outlet; 18 - burner; 19 - gas pipe; 20 - exhaust gas temperature gauge; 21 - chimney; 22 - smoke box; 23 - explosion-proof door; 24 - sewage outlet; 25 - maintenance manhole door; 26 - safety valve interface; 27 - electric cut-off valve; 28 - drain port; 41 - first partition; 42 - second partition; 43 - third partition. Specific embodiments

[0031] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments. It should be pointed out that the following detailed description is illustrative and is intended to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0032] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the figure. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "over other devices or structures" will be positioned "below other devices or structures" or "under other devices or structures" afterwards. Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations will be made to the spatial relative descriptions used here.

[0033] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, the thickness of layers and regions is enlarged for clarity, and the same reference numerals are used to denote the same devices, and thus their description will be omitted.

[0034] The present invention provides a scale and blockage prevention type high-efficiency oilfield heating furnace. The basic optimization design principle is to encapsulate the smoke tube and the fire tube in a sleeve, and use an external circulating pump system to make the furnace water flow at a high speed between the sleeve and the furnace tube, improving the weak convective heat transfer between the original furnace tube and the furnace water to a strong convective heat transfer mode, and expounding the control method of this heating furnace, aiming to fundamentally avoid the scaling phenomenon on the outer walls of the smoke tube and the fire tube of the heating furnace, thereby achieving the goals of optimizing heat transfer, preventing scale formation, and improving the comprehensive performance of the heating furnace, and providing a new solution option for energy conservation, consumption reduction, and green and safe production of oilfield enterprises.

[0035] Please refer to Figure 1 , an embodiment of the present invention provides a scale and blockage prevention type high-efficiency oilfield heating furnace, including: a heating furnace housing 3, a liquid outlet pipe 1 and a liquid inlet pipe 2 are arranged at one end of the heating furnace housing 3, a sleeve housing 14 is arranged inside the heating furnace housing 3, a sleeve liquid inlet 13 is arranged at the top of the sleeve housing 14, a sleeve liquid outlet 17 is arranged at the bottom of the sleeve housing 14, and a smoke tube 15 and a fire tube 16 are arranged inside the sleeve housing 14.

[0036] A liquid extraction pipe 6 is arranged inside the heating furnace housing 3. The sleeve liquid outlet 17 is communicated with the water space inside the furnace, the water space inside the furnace is communicated with the inlet of the liquid extraction pipe 6, the outlet of the liquid extraction pipe 6 is communicated with the inlet of a circulating pump 9, the outlet of the circulating pump 9 is communicated with the inlet of a return liquid pipe 12, and the outlet of the return liquid pipe 12 is communicated with the sleeve liquid inlet 13. The sleeve liquid inlet 13 is located in the outlet area of the smoke tube 15, and the sleeve liquid outlet 17 is located in the inlet area of the fire tube 16; the outlet of a chemical addition tank 7 is communicated with the liquid extraction pipe 6, and the connection point of the two pipes is located in the inlet area of the circulating pump 9.

[0037] A first partition 41, a second partition 42 and a third partition 43 are arranged inside the heating furnace housing 3, and the first partition 41, the second partition 42 and the third partition 43 are sequentially arranged along the liquid outlet direction between the liquid outlet pipe 1 and the sleeve housing 14.

[0038] A pump inlet pressure gauge 8 is provided on the liquid extraction pipe 6 in the inlet area of the circulation pump 9 for real-time monitoring of the inlet pressure of the pump. The circulation pump 9 is configured as a variable-frequency pump to adjust the flow rate of the circulating liquid in the system to optimize and adapt to different operating conditions of the heating furnace. A pump outlet pressure gauge 10 and a liquid flowmeter 11 are provided on the return pipe 12 in the outlet area of the circulation pump 9 for real-time monitoring of the outlet pressure of the pump and the flow rate of the circulating liquid. An electric cut-off valve 27 is provided on the outlet pipe of the chemical dosing tank 7 to control the dosing frequency and dosing amount to optimize and ensure the safety of the furnace tubes.

[0039] A smoke box 22 is provided at the end of the heating furnace housing 3. The smoke box 22 is connected to the smoke pipe 15, and a chimney 21 is connected above the smoke box 22. An explosion-proof door 23 is provided on the smoke box 22, and a smoke exhaust temperature gauge 20 and a drain port 28 are provided on the smoke box 22. The smoke exhaust temperature gauge 20 is used for real-time monitoring of the smoke exhaust temperature to monitor the real-time operating efficiency of the heating furnace.

[0040] The heating furnace housing 3 is provided with an oil collection port 5 and a maintenance manhole door 25. A burner 18 is provided at the end of the heating furnace housing 3. The burner 18 is connected to the fire tube 16, and the burner 18 is connected to a gas pipe 19. A blowdown port 24 is provided at the bottom of the heating furnace housing 3, and a safety valve interface 26 is provided at the top of the heating furnace housing 3.

[0041] In this embodiment, the casing shell 14 encapsulates the flue pipe 15 and the fire pipe 16 inside, and forms a sealed sandwich layer between the outer walls of the flue pipe 15 and the fire pipe 16 and the inner wall of the casing shell 14 as the flow space for the circulating boiler water; the casing liquid outlet 17 communicates with the water space inside the furnace; the inlet of the liquid extraction pipe 6 communicates with the water space inside the furnace. Driven by the circulating pump 9, the boiler water stored in the furnace enters the inlet of the circulating pump 9 through the liquid extraction pipe 6, and exits from the outlet of the circulating pump 9 and enters the casing liquid inlet 13 through the return liquid pipe 12. The boiler water flows rapidly between the casing shell 14 and the outer wall of the furnace pipe, and exchanges heat with the flame and high-temperature flue gas inside the furnace pipe through the furnace pipe wall. After the boiler water absorbs heat and rises in temperature, it is discharged from the casing liquid outlet 17 to the water space in the heating section of the heating furnace, and is mixed with the water in the heating section and the low-temperature boiler water from the inlet pipe 2, and transfers the heat to the boiler water in the form of strong convective heat transfer. After the boiler water absorbs heat, it overflows from the water space in the heating section through the first partition 41 and enters the oil collection section of the heating furnace through the second partition 42. The oil and water in the boiler water are initially separated under the action of gravity. The water with a larger density enters the buffer section of the heating furnace through the lower part of the third partition 43 and enters the subsequent process system through the liquid outlet pipe; the crude oil has a smaller density and floats in the upper space of the oil collection section and enters the subsequent process through the oil collection port 5; the high-temperature flue gas is discharged to the atmosphere through the smoke box 22 and the chimney 21 after releasing heat and cooling down; thus, by significantly increasing the flow rate of the boiler water on the surface of the furnace pipe wall, the deposition rate of dirt in the boiler water on the furnace pipe wall is significantly reduced, achieving the effect of reducing furnace pipe scaling and reducing the overall heat transfer resistance; due to the increase in the flow rate of the boiler water, the heat transfer intensity between the furnace pipe wall and the boiler water is effectively improved, increasing the heat transfer efficiency of the heating furnace; in order to fundamentally avoid the problem of furnace pipe scaling, a chemical dosing device is provided on the external circulation system. The scale inhibitor is stored in the chemical dosing tank 7, and the electric cut-off valve 27 is opened and closed in the way of the pump inlet and outlet hydraulic pressure difference threshold corresponding to the same circulating liquid volume or at a fixed period to optimize the control of the frequency and quantity of adding the scale inhibitor to ensure the operation safety of the heating furnace; at the same time, through the corresponding relationship between the circulating liquid volume and the pump inlet and outlet hydraulic pressure difference, in addition to judging whether there is a problem of furnace pipe scaling, it can also intuitively reflect whether there are problems such as bulging or burning through and leakage of the furnace pipe, thereby further improving the safety warning management level of the heating furnace.

[0042] Please refer to Figure 2 and Figure 3 , the embodiment of the present invention also provides a control method for a scale and blockage prevention type high-efficiency oilfield heating furnace, which is applied to the above-mentioned scale and blockage prevention type high-efficiency oilfield heating furnace. The method includes:

[0043] Obtain real-time flue gas temperature data;

[0044] Judge whether the actual flue gas temperature is equal to the threshold median;

[0045] If it is equal, keep the current frequency of the circulating pump;

[0046] If not equal, determine the relationship between the actual flue gas temperature and the upper and lower threshold values; if the actual flue gas temperature is greater than the upper threshold value, increase the frequency of the circulation pump, and re-acquire the real-time flue gas temperature data after a set delay; if the actual flue gas temperature is less than the lower threshold value, decrease the frequency of the circulation pump, and re-acquire the real-time flue gas temperature data after a set delay;

[0047] Obtain the real-time hydraulic pressure difference data of the pump inlet and outlet;

[0048] Determine whether the actual pressure difference is equal to the set pressure difference;

[0049] If they are equal, check whether the system has been operating without chemical addition for 8 consecutive hours; if so, open the electric cut-off valve and close the valve after a 5-minute delay; if not, maintain the current state and continue monitoring;

[0050] If they are not equal, determine whether the actual pressure difference is lower than the lower limit of the pressure difference; if it is lower than the lower limit, trigger the warning of furnace tube burn-through and leakage, and interlock to shut down the combustion system and the circulation pump; if it is not lower than the lower limit, determine whether the actual pressure difference is higher than the upper limit of the pressure difference; if it is higher than the upper limit, trigger the warning of furnace tube scaling and open the electric cut-off valve, and then monitor the actual pressure difference; when the actual pressure difference returns to the set pressure difference, close the electric cut-off valve; if it does not recover, keep the electric cut-off valve open and continue monitoring.

[0051] In order to optimize the operation state of the heating furnace, the present invention controls the operation frequency of the circulation pump 9 through the real-time flue gas temperature data obtained by the flue gas temperature meter 20, so that the flue gas temperature is in a better range, thereby not only ensuring that the heating furnace has a higher thermal efficiency, but also avoiding the risk of corrosion and damage to the smoke box 22 and the chimney 21 caused by too low flue gas temperature.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A scale-proof and anti-clogging high-efficiency oilfield heating furnace, characterized in that: include: A heating furnace shell (3), wherein one end of the heating furnace shell (3) is provided with a liquid outlet pipe (1) and a liquid inlet pipe (2), a sleeve shell (14) is provided inside the heating furnace shell (3), a sleeve shell (14) is provided at the top of the sleeve shell (14) with a sleeve liquid inlet (13), a sleeve liquid outlet (17) is provided at the bottom of the sleeve shell (14), and a smoke pipe (15) and a fire pipe (16) are provided inside the sleeve shell (14); A liquid taking pipe (6) is arranged in the shell (3) of the heating furnace, the sleeve liquid outlet (17) is connected to the water space in the furnace, the water space in the furnace is connected to the inlet of the liquid taking pipe (6), the outlet of the liquid taking pipe (6) is connected to the inlet of the circulation pump (9), the outlet of the circulation pump (9) is connected to the inlet of the return liquid pipe (12), the outlet of the return liquid pipe (12) is connected to the sleeve liquid inlet (13), the sleeve liquid inlet (13) is located in the outlet area of ​​the smoke pipe (15), and the sleeve liquid outlet (17) is located in the inlet area of ​​the fire pipe (16); the outlet of the dosing tank (7) is connected to the liquid taking pipe (6), and the connection point of the two pipes is located in the inlet area of ​​the circulation pump (9).

2. The scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 1, characterized in that: A first partition plate (41), a second partition plate (42) and a third partition plate (43) are arranged inside the heating furnace shell (3); the first partition plate (41), the second partition plate (42) and the third partition plate (43) are arranged in sequence along the liquid outlet direction between the liquid outlet pipe (1) and the sleeve shell (14).

3. The scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 2, characterized in that: A pump liquid inlet pressure gauge (8) is provided on the liquid extraction pipe (6) at the inlet area of ​​the circulation pump (9).

4. The scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 3, characterized in that: A pump outlet liquid pressure gauge (10) and a liquid flow meter (11) are provided on the liquid return pipe (12) at the outlet area of ​​the circulation pump (9).

5. The scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 4, characterized in that: An electric shut-off valve (27) is provided on the outlet pipe of the dosing tank (7).

6. The scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 5, characterized in that: A smoke box (22) is provided at the end of the heating furnace shell (3), the smoke box (22) is connected to the smoke pipe (15), and a chimney (21) is connected above the smoke box (22); the smoke box (22) is provided with an explosion-proof door (23), and the smoke box (22) is provided with a smoke exhaust temperature meter (20) and a water outlet (28).

7. The scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 6, characterized in that: The heating furnace shell (3) is provided with an oil receiving port (5) and a maintenance manhole door (25).

8. The scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 7, characterized in that: A burner (18) is provided at the end of the heating furnace shell (3); the burner (18) is communicated with the fire tube (16); and the burner (18) is connected to a gas pipe (19).

9. The scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 8, characterized in that: The bottom of the heating furnace shell (3) is provided with a sewage outlet (24), and the top of the heating furnace shell (3) is provided with a safety valve interface (26).

10. A control method for a scale-proof and anti-clogging high-efficiency oilfield heating furnace, applied to the scale-proof and anti-clogging high-efficiency oilfield heating furnace according to claim 9, characterized in that: The method comprises: Obtain real-time exhaust temperature data; Determine whether the actual smoke temperature is equal to the median threshold value; If they are equal, keep the current frequency of the circulation pump; If not equal, determine the relationship between the actual smoke temperature and the upper and lower limits of the threshold; if the actual smoke temperature is greater than the upper limit of the threshold, increase the frequency of the circulation pump, and re-acquire the real-time exhaust temperature data after a delay of a set time; if the actual smoke temperature is less than the lower limit of the threshold, reduce the frequency of the circulation pump, and re-acquire the real-time exhaust temperature data after a delay of a set time; Get real-time pump inlet and outlet hydraulic pressure differential data; Determine whether the actual pressure difference is equal to the set pressure difference; If they are equal, check whether the system has been running for 8 consecutive hours without adding chemicals; if so, open the electric shut-off valve and close the valve after a delay of 5 minutes; if not, maintain the current state and continue monitoring; If they are not equal, determine whether the actual pressure difference is lower than the lower limit of the pressure difference; if it is lower than the lower limit, trigger the furnace tube burn-through leakage warning, and interlock and shut down the combustion system and circulation pump; if it is not lower than the lower limit, determine whether the actual pressure difference is higher than the upper limit of the pressure difference; if it is higher than the upper limit, trigger the furnace tube scaling warning and open the electric shut-off valve, and then monitor the actual pressure difference; when the actual pressure difference returns to the set pressure difference, close the electric shut-off valve; if it has not recovered, keep the electric shut-off valve open and continue monitoring.

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