A heating device for an asphalt tank

Abstract

The application discloses a heating device of an asphalt tank, which comprises a burner, a combustion pipe, a first heating pipe and a second heating pipe. The combustion pipe is a straight pipe with high temperature resistance, the inlet of which is located outside the rear side of the asphalt tank, and the pipe body of the combustion pipe extends to the asphalt tank through the rear side of the asphalt tank. The burner is arranged at the inlet of the combustion pipe, and the flame injection port of the burner is opposite to the inlet of the combustion pipe. The first heating pipe covers the combustion pipe, the inlet of the first heating pipe is located between the rear side of the asphalt tank and the burner and is in contact with the outside air. The length of the first heating pipe is greater than that of the combustion pipe. The second heating pipe is a U-shaped pipe, the inlet of which is connected with the outlet of the first heating pipe, and the outlet of the second heating pipe is located outside the rear side of the asphalt tank. The application can improve the uneven heating of the asphalt, thereby reducing the deterioration and aging of the asphalt due to excessive heating and prolonging the service life of the asphalt.

Description

Technical Field

[0001] This invention relates to the field of asphalt tank technology, and more particularly to a heating device for asphalt tanks. Background Technology

[0002] During the transportation of asphalt in existing asphalt tank trucks, the temperature inside the tank drops, causing the asphalt to become viscous, resulting in poor fluidity and even preventing the asphalt from flowing out during unloading. Therefore, in the existing asphalt transportation process, the asphalt inside the tank needs to be heated and softened before unloading to enhance its fluidity.

[0003] Existing tanker trucks have combustion heating pipes installed inside the tank. When the asphalt inside the tank needs to be heated, the flame from the diesel burner directly contacts the inner wall of the heating pipe, raising its temperature. The existing burner flame is approximately 2 meters long, while the heating pipe is typically over 20 meters long, resulting in uneven temperature distribution. Furthermore, due to limitations in the installation and arrangement of heating pipes inside the asphalt tank, not enough pipes can be installed. Therefore, the asphalt inside the tank is heated unevenly during the heating process, requiring prolonged and continuous heating to soften all the asphalt before unloading. This leads to aging of the asphalt around the outer wall of the heating pipe.

[0004] Therefore, it is very important to ensure that the asphalt inside the tank is heated evenly. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a heating device for asphalt tanks, which can improve the uneven heating of existing asphalt, reduce the deterioration and aging of asphalt due to overheating, and improve the service life of asphalt.

[0006] To solve the above-mentioned technical problems, the present invention discloses a heating device for an asphalt tank, including a burner, a combustion tube, a first heating tube, and a second heating tube;

[0007] The combustion pipe is a high-temperature resistant straight pipe, with its inlet located outside the rear side of the asphalt tank, and its body extending through the rear side of the asphalt tank into the asphalt tank.

[0008] The burner is located at the inlet of the combustion tube, and the flame nozzle of the burner is directly facing the inlet of the combustion tube;

[0009] The first heating tube covers the combustion tube, and the inlet of the first heating tube is located between the rear side of the asphalt tank and the burner and is in contact with the outside air; the length of the first heating tube is greater than the length of the combustion tube.

[0010] The second heating pipe is a U-shaped pipe, with its inlet connected to the outlet of the first heating pipe, and the outlet of the second heating pipe is located outside the rear side of the asphalt tank.

[0011] As an optional implementation, it also includes a first air guide plate, a second air guide plate, and an air guide ring;

[0012] The first air guide plate is a circular plate, and the first air guide plate is fixed on the outer wall of the inlet of the first heating tube and closely attached to the outer wall of the first heating tube.

[0013] The second air guide plate is an annular plate, and the second air guide plate is fixed at the inlet of the combustion pipe;

[0014] The air guide ring is a conical ring, with its inner ring tightly attached to and fixed on the outer ring of the first air guide plate, and its inner conical surface pointing towards the second air guide plate; the diameter of the outermost ring of the air guide ring is greater than the outer diameter of the second air guide plate.

[0015] As another optional implementation, the length ratio of the first heating tube to the second heating tube is 13%-17%, and the length ratio of the combustion tube to the first heating tube is 50%-65%.

[0016] As another optional implementation, the diameter of the first heating tube is 0.26m-0.28m, the diameter of the second heating tube is 0.2m-0.22m, and the diameter of the combustion tube is 0.2m-0.22m.

[0017] As another optional implementation, the asphalt tank is provided with a plurality of wave-damping plates for reducing the impact of asphalt rolling. The wave-damping plates are provided with through holes at the intersection with the second heating pipe for the second heating pipe to pass through. The bottom of the inner sidewall of the through hole is fixed with support blocks at least at two points. There is a gap between the top of the second heating pipe and the top of the inner sidewall of the through hole.

[0018] As another optional implementation, the inner diameter of the second air guide plate is greater than or equal to the diameter of the flame injection port and less than the diameter of the combustion tube.

[0019] The flame nozzle of the burner passes through the inner ring of the second air guide plate and extends into the depth of the combustion tube. The extension extends radially along the outer surface of the second air guide plate at the outer wall portion outside the second air guide plate. The connection portion is tightly attached to and fixed to the outer surface of the second air guide plate.

[0020] As another optional implementation, the outer diameter of the connecting portion is less than or equal to the outer diameter of the second air guide plate.

[0021] As another optional implementation, the vertical distance between the inlet of the first heating tube and the inlet of the combustion tube is 10-20 mm.

[0022] As another optional implementation, at least two support blocks are provided on the outer wall surface of the combustion tube, the support blocks being used to prevent the combustion tube from contacting the inner wall surface of the first heating tube.

[0023] As another optional implementation, a flue pipe is also included, which includes a bent pipe section and a straight pipe section. The inlet of the bent pipe section is connected to the side wall of the outlet of the second heating pipe, and the straight pipe section is connected to the outlet of the bent pipe section. The straight pipe section extends vertically upward along the rear side of the asphalt tank.

[0024] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0025] This invention employs a sandwich design where a first heating tube surrounds a combustion tube. When the tank is heated, the flame emitted by the burner burns onto the combustion tube. During the continuous heating process of the combustion tube, heat is transferred to the first heating tube to heat the asphalt. Since the combustion tube does not directly contact the asphalt, this design improves the uneven heating of existing asphalt, thereby reducing the deterioration and aging of asphalt due to overheating and extending the service life of the asphalt. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a heating device for an asphalt tank disclosed in an embodiment of the present invention;

[0028] Figure 2 This is a partial structural schematic diagram of a heating device for an asphalt tank disclosed in an embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional structural schematic diagram of a heating device for an asphalt tank disclosed in an embodiment of the present invention;

[0030] Figure 4 This is a cross-sectional structural schematic diagram of another heating device for an asphalt tank disclosed in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the airflow channel of a heating device for an asphalt tank disclosed in an embodiment of the present invention;

[0032] Figure 6 This is a partial structural schematic diagram of another heating device for an asphalt tank disclosed in an embodiment of the present invention. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] See Figure 1-3 The present invention discloses a heating device for an asphalt tank, comprising a burner 4, a combustion tube 3, a first heating tube 1, and a second heating tube 2;

[0035] The combustion pipe 3 is a high-temperature resistant straight pipe, with its inlet located outside the rear side of the asphalt tank, and its body extending through the rear side of the asphalt tank into the asphalt tank.

[0036] The burner 4 is disposed at the inlet of the combustion tube 3, and the flame nozzle of the burner 4 is directly facing the inlet of the combustion tube 3;

[0037] The first heating tube 1 is fitted over the combustion tube 3. The inlet of the first heating tube 1 is located between the rear side of the asphalt tank and the burner 4 and is in contact with the outside air. The length of the first heating tube 1 is greater than the length of the combustion tube 3.

[0038] The second heating pipe 2 is a U-shaped pipe, with its inlet connected to the outlet of the first heating pipe 1, and the outlet of the second heating pipe 2 is located outside the rear side of the asphalt tank.

[0039] In this embodiment, outside air enters the first heating tube 1 through the gap between the first heating tube 1 and the combustion tube 3.

[0040] This embodiment uses a sandwich design where the first heating tube surrounds the combustion tube. When the tank is heated, the flame emitted by the burner burns on the combustion tube. During the continuous heating process of the flame, the combustion tube transfers heat to the first heating tube to heat the asphalt. The combustion tube does not directly contact the asphalt, which can improve the uneven heating of existing asphalt, thereby reducing the deterioration and aging of asphalt due to overheating and improving the service life of asphalt.

[0041] In an optional embodiment, such as Figure 4-5 As shown, it also includes a first air guide plate 11, a second air guide plate 31, and an air guide ring 5;

[0042] The first air guide plate 11 is an annular plate, and the first air guide plate 11 is fixed on the outer wall of the inlet of the first heating tube 1 and closely attached to the outer wall of the first heating tube 1.

[0043] The second air guide plate 31 is an annular plate, and the second air guide plate 31 is fixed at the inlet of the combustion pipe 3;

[0044] The air guide ring 5 is a conical ring. The inner ring of the air guide ring 5 is tightly attached to and fixed on the outer ring of the first air guide plate 11. The inner conical surface of the air guide ring 5 points towards the second air guide plate 31. The diameter of the outermost ring of the air guide ring 5 is larger than the outer diameter of the second air guide plate 31.

[0045] In this embodiment, outside air enters the heating channel between the first heating tube and the combustion tube through the channel between the first air guide plate and the second air guide plate. When the flame jet of the burner sprays flame, the air in the heating channel between the first heating tube and the combustion tube is heated and its temperature rises, causing the gas density to decrease and the gas pressure to drop. The outside gas with higher pressure (lower temperature) is therefore drawn into the heating channel, and the gas originally in the heating channel is pushed into the depth of the first heating tube by the drawn gas, and then heats the asphalt along the way through the wall of the heating tube via the second heating tube, thereby forming an airflow heat transfer channel, so that the asphalt is heated evenly.

[0046] In another optional embodiment, the length ratio of the first heating tube to the second heating tube is 13%-17%, and the length ratio of the combustion tube to the first heating tube is 50%-65%. Since the length ratio of the first heating tube used to generate hot gas to the second heating tube used to heat the asphalt in this embodiment is 13%-17%, a faster hot gas flow rate and sufficient flow are required to help the hot air release enough heat in the longer second heating tube to maintain a higher temperature. Because outside air becomes hot gas through contact with and absorption of heat from the combustion tube in the heating channel between the first heating tube and the combustion tube, the length of the combustion tube determines the amount of hot gas generated. However, the longer the combustion tube, the more gas needs to be added, resulting in a decrease in the gas flow rate into the second heating tube. Through multiple experiments, it was found that a length ratio of 50%-65% for the combustion tube to the first heating tube achieves a faster hot gas flow rate and a sufficient hot gas flow rate.

[0047] Optionally, the length of the first heating tube can be 2.8m-3.2m.

[0048] In another optional embodiment, the diameter of the first heating tube is 0.26m-0.28m, and the diameter of the second heating tube is 0.2m-0.22m. In this embodiment, the diameter of the second heating tube is smaller than that of the first heating tube. This is to increase the flow velocity of the hot gas inside the second heating tube, which helps the hot air to release enough heat to maintain a high temperature in the longer second heating tube.

[0049] Optionally, the diameter of the combustion tube can be 0.2m-0.22m.

[0050] In yet another alternative embodiment, such as Figure 6 As shown, the asphalt tank is equipped with multiple baffles 6 to reduce the impact of asphalt rolling. Each baffle 6 has a through hole at its intersection with the second heating pipe 2, allowing the second heating pipe 2 to pass through. Support blocks 7 are fixed at least at two points on the bottom of the inner wall of each through hole. There is a gap between the top of the second heating pipe 2 and the top of the inner wall of the through hole. Existing heating pipes are fixed to the baffles in the tank by welding, which easily leads to cracking at the weld points during thermal expansion and contraction, causing the baffles to tear and the heating pipe to become unstable. In this embodiment, by setting support blocks on the through holes of the baffles 6 to support and fix the second heating pipe 2, changes in the size of the second heating pipe 2 during heating or cooling will not affect the support and fixation function of the support blocks for the second heating pipe 2, nor will it tear the baffles 6.

[0051] In yet another alternative embodiment, such as Figure 1 , 6 As shown, the asphalt tank is provided with a plurality of wave-damping plates 6 for reducing the impact of asphalt rolling. The wave-damping plate 6 has a through hole at the intersection with the first heating pipe 1 for the first heating pipe 1 to pass through, and the bottom of the inner sidewall of the through hole is fixed with support blocks at least at two places. There is a gap between the top of the first heating pipe 1 and the top of the inner sidewall of the through hole.

[0052] In another alternative embodiment, the inner diameter of the second air guide plate 31 is greater than or equal to the diameter of the flame nozzle and less than the diameter of the combustion tube 3; the flame nozzle of the burner 4 extends through the inner ring of the second air guide plate 31 and extends into the depth of the combustion tube 3 to form an extension 41, the extension 41 extending radially along the outer plate surface of the second air guide plate 31 at the outer wall portion outside the second air guide plate 31 to form a connecting portion 42, the connecting portion 42 being tightly attached to and fixed to the outer plate surface of the second air guide plate 31.

[0053] In this embodiment, the flame nozzle is located at the top of the extension 41. In this embodiment, the connecting part 42 is used to fix the burner 4 on the second air guide plate 31 and to enclose the flame nozzle inside the combustion tube 3.

[0054] In another alternative embodiment, the outer diameter of the connecting portion is less than or equal to the outer diameter of the second air guide plate 31 to avoid blocking the air inlet.

[0055] In another optional embodiment, the vertical distance between the inlet of the first heating tube 1 and the inlet of the combustion tube 3 is 10-20 mm. In this embodiment, through multiple experiments, the vertical distance between the inlet of the first heating tube 1 and the inlet of the combustion tube 3 is limited to 10-20 mm, that is, the channel thickness between the first air guide plate 11 and the second air guide plate 31 is limited to 10-20 mm. At this thickness, air can be continuously introduced, and the heated air is also difficult to escape to the outside through the narrow channel.

[0056] In another optional embodiment, at least two support blocks 32 are provided on the outer wall surface of the combustion tube 3, the support blocks being used to prevent the combustion tube 3 from contacting the inner wall surface of the first heating tube 1.

[0057] In another optional embodiment, a flue pipe 8 is also included, which includes a bent pipe portion 81 and a straight pipe portion 82. The inlet of the bent pipe portion is connected to the side wall of the outlet of the second heating pipe 2, and the straight pipe portion is connected to the outlet of the bent pipe portion, and the straight pipe portion is vertically upward along the rear side of the asphalt tank.

[0058] In another alternative embodiment, a downwardly extending drain pipe 9 is provided at the bottom of the outlet of the second heating tube 2.

[0059] In another optional embodiment, a waterproof cover 10 is provided at the top of the exhaust pipe. When heating is required inside the tank, the waterproof cover 12 must be opened first to allow the heating pipe to be ventilated.

[0060] The content disclosed in the embodiments of this invention is only a preferred embodiment of the invention and is used only to illustrate the technical solutions of the invention, not to limit it. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this invention.

Claims

1. A heating device for an asphalt tank comprising a burner, characterized in that The combustion pipe, the first heating pipe and the second heating pipe are also included. The combustion pipe is a straight pipe with high temperature resistance, and its inlet is located outside the rear side of the asphalt tank, and its pipe body extends into the asphalt tank through the rear side of the asphalt tank. The burner is arranged at the inlet of the combustion pipe, and the flame injection port of the burner is opposite to the inlet of the combustion pipe. The first heating pipe surrounds the combustion pipe, and the inlet of the first heating pipe is located between the rear side of the asphalt tank and the burner and contacts with the outside air. The length of the first heating pipe is greater than the length of the combustion pipe. The second heating pipe is a U-shaped pipe, and its inlet is connected with the outlet of the first heating pipe, and its outlet is located outside the rear side of the asphalt tank. The first air guide plate is a circular ring plate, and the first air guide plate is fixed on the outer side wall at the inlet of the first heating pipe and closely adheres to the outer side wall of the first heating pipe. The second air guide plate is a circular ring plate, and the second air guide plate is fixed at the inlet of the combustion pipe.

2. The heating device of claim 1, wherein The air guide ring is a conical ring, and the inner ring of the air guide ring closely adheres to and is fixed on the outer ring of the first air guide plate, and the inner conical surface of the air guide ring points to the second air guide plate.

3. The heating device of claim 2, wherein, The outermost ring of the air guide ring has a diameter greater than the outer diameter of the second air guide plate.

4. The heating device of claim 1, wherein The asphalt tank is provided with a plurality of wave resistance plates for reducing the rolling impact of asphalt, and the wave resistance plates are provided with through holes for the second heating pipe to pass through at the intersection with the second heating pipe, and the inner side wall bottom of the through hole is fixed with support blocks at least at two positions. The outer wall surface of the combustion pipe is provided with at least two support blocks for avoiding the combustion pipe from contacting the inner wall surface of the first heating pipe.

5. The heating device of claim 4, wherein, The length ratio of the first heating pipe to the second heating pipe is 13%-17%, and the length ratio of the combustion pipe to the first heating pipe is 50%-65%.

6. The heating device of claim 1, wherein The pipe diameter of the first heating pipe is 0.26m-0.28m, the pipe diameter of the second heating pipe is 0.2m-0.22m, and the pipe diameter of the combustion pipe is 0.2m-0.22m. The inner diameter of the second air guide plate is greater than or equal to the diameter of the flame injection port and less than the pipe diameter of the combustion pipe. The flame injection port of the burner extends out an extension part towards the deep part of the combustion pipe through the inner ring of the second air guide plate, and the extension part extends out a connecting part along the outer surface of the second air guide plate in the radial direction at the outer wall part outside the second air guide plate, and the connecting part closely adheres to and is fixed on the outer surface of the second air guide plate. The outer diameter of the connecting part is less than or equal to the outer diameter of the second air guide plate. The vertical distance between the inlet of the first heating pipe and the inlet of the combustion pipe is 10-20mm.

7. The heating device of claim 1, wherein Also included is a smoke evacuation tube including a bent tube portion having an inlet in communication with the sidewall surface at the outlet of the second heating tube and a straight tube portion in communication with an outlet of the bent tube portion and extending vertically upward along a rear side surface of the asphalt tank.

Images