Self-adjusting anti-coking organic heat carrier furnace

Abstract

The application discloses a self-adjusting anti-coking organic heat carrier furnace, which comprises a furnace body, an inner ring coil pipe, an outer ring coil pipe, a top coil pipe and a combustion device, characterized in that one end of the inner ring coil pipe and / or one end of the outer ring coil pipe is connected with a medium inlet header, and the medium inlet header is connected with a liquid power source; a plurality of heat measuring points are arranged in the furnace body, a variable resistance assembly is fixed to the outer side of the furnace body, the variable resistance assembly is connected with a power supply and a current sensor in series, the current sensor is electrically connected with a control center, and the control center is electrically connected with the liquid power source; wherein the heat measuring point comprises an annular pipe and a transmission pipe, the diameter of the transmission pipe is smaller than that of the annular pipe, the transmission pipe is used for transmitting the change of the air pressure in the annular pipe to the variable resistance assembly, and the variable resistance assembly is driven to change its own resistance. The flow rate of the heat conducting medium is automatically adjusted to avoid the possibility of coking in the pipe and burning through the pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating furnace, in particular to a self-adjusting anti-coking organic heat carrier furnace. BACKGROUND

[0002] At present, in the organic heat carrier furnace, the heat exchange between the coil and the flue gas is not uniform in each direction, different coils and different parts of the same coil bear different surface heat intensity, at high temperature, the heat conducting medium in the coil is easy to form in-pipe coking, which will cause the coil to be burned through.

[0003] In the application No. 202020571449.4 (ultra-large anti-coking organic heat carrier furnace), the heat conducting medium in the upper end of the inner coil is rapidly convective heat exchanged with the flue gas, and the heat conducting medium in the upper end of the inner coil is also radiative heat exchanged in the radiative heat exchange chamber, which causes the temperature of the upper end of the inner coil to be relatively high, and the heat conducting medium in the pipe is easy to coking, which will cause the inner coil to be burned through, thereby affecting the service life and safety of the inner coil. The upper end of the inner coil is set as a tapered section with a small upper end and a large lower end, so as to increase the flow area of the upper end of the second heat exchange chamber, reduce the convective heat exchange effect on the upper end of the inner coil per unit area, reduce the surface heat intensity of the upper end of the inner coil, thereby reducing the temperature of the upper end of the inner coil, avoiding the coking of the heat conducting medium in the upper end of the inner coil, thereby avoiding the burning through of the inner coil, prolonging the service life of the inner coil and improving the safety of use. However, the effect of the tapered section on reducing the heat exchange is limited, and coking may still occur during use. SUMMARY

[0004] The purpose of the present application is to provide a self-adjusting anti-coking organic heat carrier furnace to solve the problem of coking of the inner coil.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A self-adjusting anti-coking organic heat carrier furnace, comprising a furnace body, an inner coil, an outer coil, a top coil and a combustion device, characterized in that one end of the inner coil and / or one end of the outer coil is connected with a medium inlet header, and the medium inlet header is connected with a liquid power source.

[0007] A plurality of heat measuring points are arranged inside the furnace body, a variable resistance assembly is fixedly arranged on the outside of the furnace body, the variable resistance assembly is connected in series with a power supply and a current sensor, the current sensor is electrically connected with a control center, and the control center is electrically connected with the liquid power source.

[0008] The heat measuring point comprises a ring-shaped tube and a transmission tube, the diameter of the transmission tube is smaller than that of the ring-shaped tube, the transmission tube is used to transmit the change of the air pressure inside the ring-shaped tube to the variable resistance component, and drive the variable resistance component to change its resistance.

[0009] Compared with the prior art, the beneficial effects of the present application are that when the temperature of the flue gas is high, the gas inside the ring-shaped tube expands to cause the air pressure to rise, the rising air pressure is transmitted to the variable resistance component, and then drives the resistance of the variable resistance component to change, the power supply, the current sensor and the variable resistance component form a closed circuit loop, the resistance of the variable resistance component changes, thereby causing the current monitored by the current sensor to change, the current sensor transmits the current signal to the control center, and the control center controls the liquid power source to increase the flow rate of the heat conducting medium, thereby avoiding the temperature of the heat conducting medium in the local area being too high, and avoiding coking in the pipe and burning through the coil. When the temperature of the flue gas is low, the control center controls the liquid power source to reduce the flow rate of the heat conducting medium, thereby saving energy, and the reliability of the electrical components is less than that of the liquid and air pressure system. Due to the high temperature inside the furnace body, the unreliability is further amplified. The combination of the ring-shaped tube and the transmission tube transmits the temperature signal to the outside of the furnace body, and then uses electrical components outside the furnace body 1 to transmit the signal, thereby improving the reliability of the self-regulating system, and further avoiding coking in the pipe and burning through the coil.

[0010] Preferably, the variable resistance component comprises a power chamber, a sliding rail, a contact point and a resistance ring.

[0011] The sliding rail extends into the inside of the power chamber, the tail end of the power chamber is in communication with the transmission tube, the output end of the power chamber abuts against the contact point, the contact point is in contact with the resistance ring to form an electrical connection, and the contact point slides along the sliding rail.

[0012] Preferably, the variable resistance component further comprises a support, a first fastening bolt, the support is detachably mounted on the furnace body, the sliding rail is mounted on the support through the first fastening bolt, and the power chamber is mounted on the support.

[0013] Preferably, an arc segment and a connecting plate are sleeved on the outside of the transmission tube, two ends of the arc segment are connected with plane segments, the connecting plate is provided with annular clamping grooves for clamping the arc segment, the radial circumference of the annular clamping grooves is greater than that of the connecting plate, a second fastening bolt is arranged between the two plane segments, the connecting plate is provided with a plurality of threaded holes, and third fastening bolts are screwed into the threaded holes.

[0014] Preferably, epoxy resin is arranged between the arc segment, the connecting plate and the transmission tube.

[0015] Preferably, the output end of the power chamber comprises a ring-shaped seal and / or a ring-shaped sleeve, which are sleeved with the slide rail.

[0016] Preferably, the liquid power source comprises a centrifugal pump, a liquid output end, and a liquid input end, wherein the liquid output end is in communication with the medium inlet header, and the liquid input end is connected with a heat-conducting medium source.

[0017] Preferably, the furnace body is provided with a furnace cavity and an exhaust port in communication with the furnace cavity.

[0018] The inner coil pipe, the outer coil pipe, and the top coil pipe are all arranged in the furnace cavity, the outer coil pipe is sleeved outside the inner coil pipe, the top coil pipe is connected to the upper end of the outer coil pipe and in communication with the outer coil pipe, one end of the inner coil pipe and one end of the outer coil pipe both extend out of the furnace body for connecting with the heat-conducting medium, and the other end of the inner coil pipe and one end of the top coil pipe both extend out of the furnace body for discharging the heat-conducting medium.

[0019] The first heat exchange chamber is formed between the inner coil pipe and the top coil pipe, the second heat exchange chamber is formed between the inner coil pipe and the outer coil pipe, the third heat exchange chamber is formed between the outer coil pipe and the furnace body, the upper end of the first heat exchange chamber is in communication with the upper end of the second heat exchange chamber, the lower end of the second heat exchange chamber is in communication with the lower end of the third heat exchange chamber, and the third heat exchange chamber is in communication with the exhaust port.

[0020] The upper end of the inner coil pipe is provided with a tapered section with a small diameter at the top and a large diameter at the bottom, so as to increase the flow area of the upper end of the second heat exchange chamber.

[0021] The combustion device is connected to the furnace body and located at the lower end of the first heat exchange chamber, and the flue gas generated by the combustion of the combustion device flows through the first heat exchange chamber, the second heat exchange chamber, and the third heat exchange chamber in sequence and is then discharged from the exhaust port.

[0022] Preferably, one end of the inner coil pipe and / or one end of the outer coil pipe is connected with a medium outlet header, and the inner coil pipe, the outer coil pipe, and the top coil pipe are each formed by coiling at least one furnace pipe.

[0023] Preferably, the furnace body is provided with a heat-insulating wall on the outer wall.

[0024] The exhaust port is connected with an explosion-proof door.

[0025] The furnace body comprises a furnace body and an end cover connected to the top of the furnace body, and the end cover comprises two independent cover bodies.

[0026] The bottom of the furnace body and / or the cover body is provided with an inspection manhole.

[0027] The upper end of the top coil pipe is provided with a heat-insulating sealing inner top cover;

[0028] The combustion device is a gas burner. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a self-adjusting anti-coking organic heat carrier furnace;

[0030] Figure 2 It is a partial enlarged view of the middle A part; Figure 1

[0031] Figure 3 It is a partial enlarged view of the middle B part; Figure 1

[0032] Figure 4 It is a bottom view of a self-adjusting anti-coking organic heat carrier furnace;

[0033] Figure 5 It is a top view of a self-adjusting anti-coking organic heat carrier furnace;

[0034] Figure 6 It is a structural schematic diagram of a ring-shaped pipe;

[0035] Figure 7 It is a partial enlarged view of the middle C part; Figure 6

[0036] It is a structural schematic diagram of the inside of a power room. Figure 8 In the figure: 1, furnace body; 2, inner circle coil pipe; 3, outer circle coil pipe; 4, top coil pipe; 5, combustion device; 6, exhaust port; 7, first heat exchange chamber; 8, second heat exchange chamber; 9, third heat exchange chamber; 10, medium inlet header; 11, medium outlet header; 12, furnace pipe; 14, heat-insulating wall; 15, explosion-proof door; 16, cover body; 17, manhole; 18, top cover; 19, ring-shaped pipe; 20, transmission pipe; 21, third fastening bolt; 22, connecting plate; 23, arc segment; 24, plane segment; 25, contact; 26, power room; 261, ring-shaped sleeve; 262, ring-shaped sealing element; 27, first fastening bolt; 28, slide rail; 29, support; 30, liquid power source; 301, liquid input end; 302, liquid output end.

[0037] EMBODIMENT In order to make the person in the art better understand the present application scheme, the present application is further described in detail below in combination with the drawings and specific embodiments.

[0038]

[0039] ​​​In this article, the terms such as "upper, lower, inner, outer" are established based on the positional relationship shown in the drawings, and according to different drawings, the corresponding positional relationship may also change accordingly, therefore, it cannot be understood as an absolute limitation on the scope of protection; Moreover, relationship terms such as "first" and "second" are only used to distinguish one part from another part with the same name, and do not necessarily require or imply any such actual relationship or order between the parts. Embodiments

[0040] As Figures 1-8 shown, the present embodiment provides a self-adjusting anti-coking organic heat carrier furnace, which comprises a furnace body 1, an inner ring coil pipe 2, an outer ring coil pipe 3, a top coil pipe 4 and a combustion device 5, one end of the inner ring coil pipe 2 and / or one end of the outer ring coil pipe 3 is connected with a medium inlet header 10, the medium inlet header 10 is connected with a liquid power source 30;

[0041] The inside of the furnace body 1 is provided with a plurality of heat measuring points, and the outside of the furnace body 1 is fixedly provided with a variable resistance assembly, the variable resistance assembly is connected in series with a power supply and a current sensor, the current sensor is electrically connected with a control center, and the control center is electrically connected with the liquid power source 30;

[0042] Among them, the heat measuring point comprises an annular pipe 19 and a transmission pipe 20, the diameter of the transmission pipe 20 is smaller than the diameter of the annular pipe 19, the transmission pipe 20 is used to transmit the change of air pressure inside the annular pipe 19 to the variable resistance assembly, and drive the variable resistance assembly to change its resistance.

[0043] Specifically, the annular pipe 19 is arranged at the upper end of the inner coil pipe 2 for monitoring the temperature of the flue gas. Preferably, the inside of the annular pipe 19 is provided with lead. When the temperature of the flue gas is high, the gas in the annular pipe 19 expands to cause the gas pressure to rise, and the lead liquefies and expands to further compress the gas in the annular pipe 19, so that the gas pressure in the annular pipe 19 rises. The increased gas pressure is transmitted to the variable resistance assembly, thereby causing the resistance of the variable resistance assembly to change. The power supply, the current sensor and the variable resistance assembly form a closed circuit loop. The change in the resistance of the variable resistance assembly causes the current monitored by the current sensor to change. The current sensor transmits the current signal to the control center. The control center controls the liquid power source 30 to increase the flow rate of the heat-conducting medium, thereby avoiding excessive temperature of the heat-conducting medium in the local area and preventing coking in the pipe and burning of the coil pipe. When the temperature of the flue gas is low, the control center controls the liquid power source 30 to reduce the flow rate of the heat-conducting medium, thereby saving energy. The reliability of the electrical components is less than that of the liquid and gas pressure system. Due to the high temperature inside the furnace body 1, the unreliability is further amplified. The combination of the annular pipe 19 and the transmission pipe 20 transmits the temperature signal to the outside of the furnace body 1, and the electrical components outside the furnace body 1 are used to transmit the signal, thereby improving the reliability of the self-regulating system and further preventing the burning of the coil pipe caused by coking in the pipe.

[0044] Further, the variable resistance assembly comprises a power chamber 26, a sliding rail 28, a contact 25 and a resistance ring. The sliding rail 28 extends into the inside of the power chamber 26. The tail end of the power chamber 26 is in communication with the transmission pipe 20. The output end of the power chamber 26 abuts against the contact 25. The contact 25 is in contact with the resistance ring to form an electrical connection. The contact 25 slides along the sliding rail 28. The contact 25 is electrically connected with a power supply. The power supply is electrically connected with a current sensor. The current sensor is electrically connected with one end of the resistance ring. The contact 25 is electrically connected with the resistance ring to form a current loop. The gas pressure is transmitted to the power chamber 26, thereby driving the contact 25 to slide on the sliding rail 28 to change the access resistance of the resistance ring, thereby changing the current size in the current loop. The current sensor transmits the signal to the control center, thereby controlling the flow rate. The variable resistance assembly further comprises a bracket 29 and a first fastening bolt 27. The bracket 29 is detachably mounted to the furnace body 1. The sliding rail 28 is mounted to the bracket 29 through the first fastening bolt 27. The power chamber 26 is mounted to the bracket 29.

[0045] Further, the outer side of the transmission pipe 20 is sleeved with the arc segment 23 and the connecting plate 22, two ends of the arc segment 23 are connected with the plane segment 24, the connecting plate 22 is provided with the annular clamping groove clamping the arc segment 23, the radial circumference of the annular clamping groove is greater than the radial circumference of the connecting plate 22, the second fastening bolt is arranged between the two plane segments 24, the connecting plate 22 is provided with a plurality of threaded holes, the third fastening bolt 21 is screwed in the threaded holes, the radial width of the annular clamping groove is greater than the radial width of the arc segment 23, the arc segment 23 can be radially retracted in the internal space of the annular clamping groove and can make the two ends of the arc segment 23 close together. By screwing the second fastening bolt to drive the two plane segments 24 to close to each other, preferably, the second fastening bolt is provided with the locking nut, the end surface of the locking nut abuts against the plane segment 24 to avoid loosening of the second fastening bolt. The two plane segments 24 close to each other drive the two ends of the arc segment 23 to close to each other and radially retract, tightly hold the transmission pipe 20, fix the connecting plate 22 to the transmission pipe 20, and then the transmission pipe 20 can be fixed to the furnace body through the connecting plate 22 and the third fastening bolt 21.

[0046] The arc segment 23 and / or the connecting plate 22 and the transmission pipe 20 are provided with the epoxy resin. The epoxy resin plays a sealing and heat preservation role.

[0047] The output end of the power chamber 26 includes the annular sealing element 262 and the annular sleeve 261, the annular sealing element 262 and / or the annular sleeve 261 sleeve the sliding rail 28. The internal gas pressure of the power chamber 26 changes, thereby driving the annular sealing element 262 to move along the sliding rail 28 and drive the annular sleeve 261 to push the contact point 25. The liquid power source 30 includes the centrifugal pump, the liquid output end 302 and the liquid input end 301, the liquid output end 302 communicates with the medium inlet header 10, and the liquid input end 301 is pipeline connected with the heat conduction medium source.

[0048] The furnace body 1 is provided with a furnace cavity and an exhaust port 6 communicating with the furnace cavity;

[0049] The inner coil pipe 2, the outer coil pipe 3 and the top coil pipe 4 are all arranged in the furnace cavity, the outer coil pipe 3 is sleeved on the outer side of the inner coil pipe 2, the top coil pipe 4 is connected to the upper end of the outer coil pipe 3 and communicates with the outer coil pipe 3, one end of the inner coil pipe 2 and one end of the outer coil pipe 3 both extend out of the furnace body 1 so as to be connected with the heat conduction medium, the other end of the inner coil pipe 2 and one end of the top coil pipe 4 both extend out of the furnace body 1 so as to discharge the heat conduction medium; the heat conduction medium flows into the inner coil pipe 2 from the lower end of the inner coil pipe 2, then flows out from the upper end of the inner coil pipe 2, and simultaneously, the heat conduction medium also flows into the outer coil pipe 3 from the lower end of the outer coil pipe 3, then flows into the top coil pipe 4, and then flows out from the top coil pipe 4;

[0050] A first heat exchange chamber 7 is formed between the inner coil pipe 2 and the top coil pipe 4, a second heat exchange chamber 8 is formed between the inner coil pipe 2 and the outer coil pipe 3, a third heat exchange chamber 9 is formed between the outer coil pipe 3 and the furnace body 1, the upper end of the first heat exchange chamber 7 is communicated with the upper end of the second heat exchange chamber 8, the lower end of the second heat exchange chamber 8 is communicated with the lower end of the third heat exchange chamber 9, and the third heat exchange chamber 9 is communicated with the exhaust port 6;

[0051] The upper end of the inner coil pipe 2 is provided with a tapered section which is small at the top and large at the bottom, so as to increase the flow area of the upper end of the second heat exchange chamber 8, reduce the convective heat exchange effect on the unit area of the upper end of the inner coil pipe 2, reduce the surface heat intensity of the upper end of the inner coil pipe 2, further reduce the temperature of the upper end of the inner coil pipe 2, avoid coking of the heat conducting medium at the upper end of the inner coil pipe 2, further avoid burning of the inner coil pipe 2, prolong the service life of the inner coil pipe 2, and improve the safety of use.

[0052] The combustion device 5 is connected to the furnace body 1 and located at the lower end of the first heat exchange chamber 7, the flue gas generated by the combustion of the combustion device 5 flows through the first heat exchange chamber 7, the second heat exchange chamber 8 and the third heat exchange chamber 9 in turn and is discharged from the exhaust port 6, the combustion device 5 is combusted in the first heat exchange chamber 7 to perform radiation heat exchange on the heat conducting medium in the inner coil pipe 2, the high-temperature flue gas generated by the combustion of the combustion device 5 flows into the second heat exchange chamber 8 and the third heat exchange chamber 9 to perform convective heat exchange on the heat conducting medium in the inner coil pipe 2 and the outer coil pipe 3, and the utilization rate of heat energy is improved.

[0053] One end of the inner coil pipe 2 and / or one end of the outer coil pipe 3 is connected with a medium outlet header 11, and the inner coil pipe 2, the outer coil pipe 3 and the top coil pipe 4 are respectively formed by winding at least one furnace pipe 12.

[0054] The outer wall of the furnace body 1 is provided with a heat preservation wall 14;

[0055] An explosion-proof door 15 is connected at the exhaust port 6;

[0056] The furnace body 1 comprises a furnace body and an end cover connected to the top of the furnace body, and the end cover comprises two independent cover bodies 16;

[0057] The bottom of the furnace body 1 and / or the cover body 16 is provided with an inspection manhole 17;

[0058] The upper end of the top coil pipe 4 is provided with a heat preservation sealing inner top cover 18;

[0059] The combustion device 5 is a gas burner;

[0060] The heat conducting medium flows from the medium inlet header 10 into the inner coil 2 and the outer coil 3, the heat conducting medium in the outer coil 3 flows into the top coil 4, and then the heat conducting medium flows from the inner coil 2 and the top coil 4 into the medium outlet header 11. The combustion device 5 burns in the first heat exchange chamber 7 to radiate heat to the heat conducting medium in the inner coil 2, the high-temperature flue gas generated by the combustion device 5 flows into the second heat exchange chamber 8 and the third heat exchange chamber 9 to conduct heat to the heat conducting medium in the inner coil 2 and the outer coil 3, and finally the flue gas is discharged from the exhaust port 6. Moreover, the organic heat carrier furnace adopts a cylindrical overall structure, which is convenient for overall transportation and easy for daily maintenance.

[0061] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present disclosure.

Claims

1. A self-regulating anti-coking organic heat carrier furnace comprising a furnace body (1), an inner ring coil (2), an outer ring coil (3), a top coil (4) and a combustion device (5), characterized in that, One end of the inner ring coil pipe (2) and / or one end of the outer ring coil pipe (3) is connected with a medium inlet header (10), and the medium inlet header (10) is connected with a liquid power source (30); The inside of the furnace body (1) is provided with a plurality of heat measuring points, and the outside of the furnace body (1) is fixedly provided with a variable resistance assembly, the variable resistance assembly is connected in series with a power supply and a current sensor, the current sensor is electrically connected with a control center, and the control center is electrically connected with the liquid power source (30); The heat measuring point comprises an annular pipe (19) and a transmission pipe (20), the diameter of the transmission pipe (20) is smaller than the diameter of the annular pipe (19), the transmission pipe (20) is used to transmit the change of the air pressure in the annular pipe (19) to the variable resistance assembly, and drive the variable resistance assembly to change its own resistance; The variable resistance assembly comprises a power chamber (26), a sliding rail (28), a contact (25) and a resistance ring; The sliding rail (28) extends into the inside of the power chamber (26), the tail end of the power chamber (26) is communicated with the transmission pipe (20), the output end of the power chamber (26) abuts against the contact (25), the contact (25) is in contact with the resistance ring to form an electrical connection, and the contact (25) slides along the sliding rail (28); The variable resistance assembly further comprises a support (29) and a first fastening bolt (27), the support (29) is detachably mounted on the furnace body (1), the sliding rail (28) is mounted on the support (29) through the first fastening bolt (27), and the power chamber (26) is mounted on the support (29); The outside of the transmission pipe (20) is sleeved with an arc segment (23) and a connecting plate (22), both ends of the arc segment (23) are connected with a plane segment (24), the connecting plate (22) is provided with an annular clamping groove for clamping the arc segment (23), the radial circumference of the annular clamping groove is greater than the radial circumference of the connecting plate (22), a second fastening bolt is arranged between the two plane segments (24), the connecting plate (22) is provided with a plurality of threaded holes, and the threaded holes are screwed with third fastening bolts (21); Epoxy resin is arranged between the arc segment (23), the connecting plate (22) and the transmission pipe (20).

2. A self-adjusting anticoking organic heat transfer heater as claimed in claim 1 wherein, The output end of the power chamber (26) comprises an annular sealing element (262) and an annular sleeve (261), and the annular sealing element (262) and / or the annular sleeve (261) sleeve the sliding rail (28).

3. A self-adjusting anti-coking heat transfer furnace according to claim 1, wherein The liquid power source (30) comprises a centrifugal pump, a liquid output end (302) and a liquid input end (301), the liquid output end (302) is communicated with the medium inlet header (10), and the liquid input end (301) is pipeline connected with a heat conduction medium source.

4. A self-adjusting anti-coking heat transfer furnace according to any one of claims 1-3, characterized in that, The furnace body (1) is provided with a furnace cavity and an exhaust port (6) communicated with the furnace cavity; The inner coil pipe (2), the outer coil pipe (3) and the top coil pipe (4) are arranged in the furnace cavity, the outer coil pipe (3) is sleeved outside the inner coil pipe (2), the top coil pipe (4) is connected to the upper end of the outer coil pipe (3) and communicates with the outer coil pipe (3), one end of the inner coil pipe (2) and one end of the outer coil pipe (3) extend out of the furnace body (1) to access the heat conducting medium, the other end of the inner coil pipe (2) and one end of the top coil pipe (4) extend out of the furnace body (1) to discharge the heat conducting medium; The first heat exchange chamber (7) is formed between the inner coil pipe (2) and the top coil pipe (4), the second heat exchange chamber (8) is formed between the inner coil pipe (2) and the outer coil pipe (3), the third heat exchange chamber (9) is formed between the outer coil pipe (3) and the furnace body (1), the upper end of the first heat exchange chamber (7) communicates with the upper end of the second heat exchange chamber (8), the lower end of the second heat exchange chamber (8) communicates with the lower end of the third heat exchange chamber (9), and the third heat exchange chamber (9) communicates with the exhaust port (6); The upper end of the inner coil pipe (2) is provided with a tapered section with a small lower end and a large upper end, so as to increase the flow area of the upper end of the second heat exchange chamber (8); The combustion device (5) is connected to the furnace body (1) and located at the lower end of the first heat exchange chamber (7), the flue gas generated by the combustion of the combustion device (5) flows through the first heat exchange chamber (7), the second heat exchange chamber (8) and the third heat exchange chamber (9) in sequence and is discharged from the exhaust port (6).

5. A self-adjusting anticoking heat-transfer furnace according to claim 4, characterized in that One end of the inner coil pipe (2) and / or one end of the outer coil pipe (3) is connected with a medium outlet header (11), and the inner coil pipe (2), the outer coil pipe (3) and the top coil pipe (4) are respectively coiled by at least one furnace pipe (12).

6. A self-adjusting anticoking heat-transfer furnace according to claim 5, characterized in that, The outer wall of the furnace body (1) is provided with a heat preservation wall (14); An explosion-proof door (15) is connected at the exhaust port (6); The furnace body (1) comprises a furnace body and an end cover connected to the top of the furnace body, and the end cover comprises two independent cover bodies (16); The bottom of the furnace body (1) and / or the cover body (16) is provided with an inspection manhole (17); The upper end of the top coil pipe (4) is provided with a heat preservation sealing inner top cover (18); The combustion device (5) is a gas burner.

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