A whole type asphalt mixing station fuel flowmeter control system

Abstract

The application provides a whole asphalt mixing station fuel flow meter control system for monitoring heavy oil flow of primary burners and regeneration burners, comprising a heavy oil tank, a first oil injection system and a second oil injection system, the heavy oil tank is communicated with an oil inlet pipeline and an oil return pipeline; the first oil injection system comprises a fuel gun body and a spray head, the fuel gun body is arranged outside the regeneration burner, and the spray head is arranged inside the regeneration burner; the fuel gun body is communicated with the heavy oil tank through the oil inlet pipeline, is used for conveying the pressurized heavy oil to the spray head, so that the spray head sprays oil to the regeneration burner; the first oil injection system calculates the heavy oil flow through the oil inlet flow of the fuel gun body; the second oil injection system comprises a fuel main gun, the fuel main gun is arranged inside the primary burner and is communicated with the heavy oil tank through the oil inlet pipeline and the oil return pipeline; the second oil injection system calculates the heavy oil flow through the difference between the oil inlet flow and the oil return flow of the fuel main gun. The control system provided by the application can prevent the high temperature in the drying cylinder from damaging the spray head.

Description

Technical Field

[0001] This disclosure generally relates to the field of asphalt mixing technology, and specifically to an integrated fuel flow meter control system for an asphalt mixing plant. Background Technology

[0002] Asphalt concrete mixing plants are key equipment for the professional production of asphalt concrete, widely used in asphalt pavement projects such as highways and airports. During operation, the material inside the drying drum is dried by a burner. After the moisture is evaporated, it is mixed with asphalt. The burners used are mostly heavy oil burners with internal circulation main nozzles. Heavy oil is injected into the burner through the internal circulation main nozzle, and the internal circulation design reduces manual operation and the frequency of nozzle cleaning.

[0003] Traditional internal circulation main guns are all installed inside the burner housing. Because the drying cylinder is under negative pressure during the drying process, some airflow overflows into the burner when the machine stops, carrying heat. The aggregate processed by the virgin drying cylinder has a weak heat storage capacity and carries out little heat, so it has little impact on the main gun. However, the recycled asphalt material processed by the recycled drying cylinder is prone to sticking to the cylinder wall, has a strong heat storage capacity, and the overflowing airflow carries a lot of heat, which can easily damage the circulation main gun. Moreover, if it is not cleaned in time after shutdown, the heavy oil will dry and solidify inside the internal circulation main gun, directly affecting subsequent use. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an integrated fuel flow meter control system for asphalt mixing plants to solve the above problems.

[0005] This application provides an integrated fuel flow meter control system for an asphalt mixing plant, used to monitor the heavy oil flow of the primary burner and the regenerated burner, including a heavy oil tank, a first fuel injection system and a second fuel injection system, wherein the heavy oil tank is connected to an oil inlet pipe and an oil return pipe; The first fuel injection system includes a fuel nozzle and an injection head. The fuel nozzle is located outside the regenerator, and the injection head is located inside the regenerator. The fuel nozzle is connected to the heavy oil tank through the fuel inlet pipe, and is used to pressurize the heavy oil and deliver it to the injection head so that the injection head can inject fuel into the regenerator. The first fuel injection system calculates the heavy oil flow rate based on the fuel inlet flow rate of the fuel nozzle. The second fuel injection system includes a main fuel nozzle, which is located inside the primary burner and connected to the heavy fuel tank through the fuel inlet pipe and the fuel return pipe, for injecting fuel into the primary burner; the second fuel injection system calculates the heavy fuel flow rate by the difference between the fuel inlet flow rate and the fuel return flow rate of the main fuel nozzle.

[0006] According to the technical solution provided in the embodiments of this application, the fuel nozzle includes a first oil port and a second oil port. The first oil port is connected to the oil inlet pipe through a first oil passage, and the second oil port is connected to the injection head through a second oil passage. A first flow monitoring component for detecting the oil flow rate of the fuel nozzle is provided on the first oil passage.

[0007] According to the technical solution provided in the embodiments of this application, the first flow monitoring component includes a first three-way valve and a first flow meter. The first valve port of the first three-way valve is connected to the oil inlet pipeline, the second valve port of the first three-way valve is connected to the first oil port through the first flow meter, and the third valve port of the first three-way valve is connected to the first oil passage between the first flow meter and the first oil port.

[0008] According to the technical solution provided in the embodiments of this application, the fuel nozzle further includes a first air port and a second air port; the first fuel injection system further includes a pressure supply assembly, the pressure supply assembly comprising: A first air compressor, a first air passage, and a second air passage, wherein the first air passage connects the first air port and the first air compressor, and the second air passage connects the second air port and the injection head.

[0009] According to the technical solution provided in the embodiments of this application, the fuel nozzle further includes a third oil port, which is connected to the return oil line via a third oil passage, and a first ball valve is provided on the third oil passage; the pressure supply assembly further includes: The second three-way valve is located on the first oil line. The first valve port and the second valve port of the second three-way valve are respectively connected to the oil inlet pipeline and the first valve port of the first three-way valve. The third valve port of the second three-way valve is connected to the first air compressor. The second ball valve is located in the second gas line.

[0010] According to the technical solution provided in the embodiments of this application, the pressure supply assembly further includes a third air passage, which connects the first air compressor and the second oil passage, and a third ball valve is provided on the third air passage.

[0011] According to the technical solution provided in the embodiments of this application, a first booster pump is also provided in the first oil circuit, and the first booster pump is placed between the second valve port of the second three-way valve and the first valve port of the first three-way valve.

[0012] According to the technical solution provided in the embodiments of this application, a fourth ball valve is further provided between the third valve port of the second three-way valve and the first air compressor.

[0013] According to the technical solution provided in the embodiments of this application, the oil inlet pipeline is provided with a primary filter and a secondary filter, and the filtration accuracy of the secondary filter is greater than that of the primary filter.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: By setting up a first oil injection system and a second oil injection system, oil can be supplied to the burners corresponding to the raw material drying drum and the recycled material drying drum of the integrated mixing plant respectively, and the heavy oil flow rate can be detected; by placing the injection head of the first oil injection system inside the recycled burner and the fuel gun body outside the recycled burner, most of the structure of the injection part is placed outside the burner shell, avoiding damage to the injection part caused by the high heat storage capacity of the recycled material drying drum and the overflowing high temperature when the machine is stopped, and at the same time preventing the heavy oil remaining inside the first oil injection system from drying rapidly due to high temperature; the first oil injection system, taking into account its characteristic of first delivering heavy oil from the fuel gun body to the injection head and then injecting it, directly and accurately reflects the heavy oil consumption through the oil inlet flow rate to reduce pressure loss; the second oil injection system, because it adopts direct injection from the fuel main gun, calculates the heavy oil flow rate by the difference between the oil inlet flow rate and the oil return flow rate, and can accurately count the consumption. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic diagram of the integrated fuel flow meter control system for an asphalt mixing plant provided in this application; Figure 2 for Figure 1 Enlarged structural diagram at point A; Figure 3 for Figure 1 A magnified structural diagram at point B in the middle.

[0016] Reference numerals: 1. Heavy oil tank; 2. Oil inlet pipe; 3. Oil return pipe; 4. Fuel nozzle body; 5. Injector head; 6. Main fuel nozzle; 7. First fuel port; 8. Second fuel port; 9. First fuel line; 10. Second fuel line; 11. First three-way valve; 12. First flow meter; 13. First air port; 14. Second air port; 15. First air compressor; 16. First air line; 17. Second air line; 18. Third fuel port; 19. Third fuel line; 20. First ball valve; 21. Second three-way valve; 22. Second ball valve; 23. Third air line; 24. Third ball valve; 25. First booster pump; 26. 27. Fourth ball valve; 28. First-stage filter; 29. ​​Second-stage filter; 30. First check valve; 31. First ceramic ball; 32. First cylinder; 33. Fourth oil port; 34. Fifth oil port; 35. Fourth oil passage; 36. Fifth oil passage; 37. Third air port; 38. Fourth air passage; 39. Third three-way valve; 40. Fourth three-way valve; 41. Fifth three-way valve; 42. Second flow meter; 43. Third flow meter; 44. Second air compressor; 45. Second booster pump; 46. Fifth ball valve; 47. Second check valve; 48. Injection port; 49. Second ceramic ball; 40. Second cylinder. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Please refer to Figures 1-3 This application provides an integrated fuel flow meter control system for an asphalt mixing plant, used to monitor the heavy oil flow of the primary burner and the regenerated burner, including a heavy oil tank 1, a first oil injection system and a second oil injection system, wherein the heavy oil tank 1 is connected to an oil inlet pipe 2 and an oil return pipe 3. The first fuel injection system includes a fuel nozzle 4 and an injection head 5. The fuel nozzle 4 is located outside the regenerator, and the injection head 5 is located inside the regenerator. The fuel nozzle 4 is connected to the heavy oil tank 1 through the fuel inlet pipe 2, and is used to pressurize the heavy oil and deliver it to the injection head 5 so that the injection head 5 injects fuel into the regenerator. The first fuel injection system calculates the heavy oil flow rate based on the fuel inlet flow rate of the fuel nozzle 4. The second fuel injection system includes a main fuel nozzle 6, which is located inside the primary burner and connected to the heavy fuel tank 1 through the fuel inlet pipe 2 and the fuel return pipe 3, for injecting fuel into the primary burner; the second fuel injection system calculates the heavy fuel flow rate by the difference between the fuel inlet flow rate and the fuel return flow rate of the main fuel nozzle 6.

[0020] Specifically, the recycled burner is located at the inlet of the recycled material drying cylinder. The first oil injection system assists the recycled burner in drying the recycled asphalt material in the drying cylinder and monitors the heavy oil flow rate during operation. The virgin burner is located at the outlet of the virgin material drying cylinder. The second oil injection system assists the virgin burner in drying the aggregate in the virgin material drying cylinder and monitors the heavy oil flow rate during operation. The heavy oil tank 1 serves as a storage component for heavy oil, and it is connected to an inlet pipe 2 and a return pipe 3. The inlet pipe 2 is used to transport the heavy oil in the heavy oil tank 1 to each oil injection system, while the return pipe 3 is used to return the heavy oil that has not participated in combustion to the heavy oil tank 1, forming a circulation path for the heavy oil.

[0021] The first fuel injection system mainly includes a fuel nozzle 4 and an injector head 5. The fuel nozzle 4 and the injector head 5 together form a traditional circulating main nozzle. The fuel nozzle 4 is located outside the regenerator and can transport heavy fuel oil pressurized from the heavy fuel oil tank 1 through the fuel inlet pipe 2. The injector head 5 is located inside the regenerator. The heavy fuel oil pressurized by the fuel nozzle 4 is transported to the injector head 5 and injected into the regenerator. Since the heavy fuel oil is not directly injected from the fuel nozzle 4 outside the regenerator, but needs to be transported to the injector head 5 inside the regenerator for injection, in order to reduce the pressure loss from the fuel nozzle 4 to the injector head 5, the fuel nozzle 4 does not return fuel to the heavy fuel oil tank 1 during normal operation. Therefore, the heavy fuel oil flow rate can be obtained by directly monitoring the fuel inlet flow rate of the fuel nozzle 4. Since only the injector head 5 is located inside the regenerator, while most of the components of the injection structure are located outside the regenerator, the risk of the first injection system being damaged by the heat-carrying air overflowing into the burner during shutdown is reduced. Furthermore, the heavy oil remaining inside the injector head 5 will not dry out immediately, allowing operators sufficient time to clean it.

[0022] The second fuel injection system mainly includes a main fuel nozzle 6, which is located inside the primary burner and connected to the heavy fuel tank 1 via an inlet pipe 2 and a return pipe 3. Heavy fuel enters the main fuel nozzle 6 through the inlet pipe 2 and is directly injected into the primary burner. Since there is no pressure loss issue with the injection from the main fuel nozzle 6, the injected heavy fuel flows back to the heavy fuel tank through the return pipe 3. The heavy fuel flow rate is calculated by subtracting the difference between the inlet flow rate and the return flow rate of the main fuel nozzle 6; this difference represents the actual heavy fuel flow rate injected into the primary burner.

[0023] It should be noted that the first and second fuel injection systems are connected in parallel to the fuel inlet line 2 and the fuel return line 3. They are relatively independent and do not affect each other, allowing the primary burner and the regenerator to work independently or simultaneously.

[0024] Furthermore, the fuel nozzle body includes a first oil port 7 and a second oil port 8. The first oil port 7 is connected to the oil inlet pipe 2 through a first oil passage 9, and the second oil port 8 is connected to the injection head 5 through a second oil passage 10. The first oil passage 9 is provided with a first flow monitoring component for detecting the oil flow rate of the fuel nozzle body 4.

[0025] Specifically, the first oil port 7 serves as the inlet of the fuel nozzle 4, and the second oil port 8 serves as the outlet of the fuel nozzle 4. The first oil port 7 is connected to the inlet pipe 2 via the first oil passage 9, providing a channel for heavy fuel oil to enter the fuel nozzle 4. The second oil port 8 is connected to the injector head 5 via the second oil passage 10, allowing the heavy fuel oil processed by the fuel nozzle 4 to be delivered to the injector head 5, thus completing the injection action into the burner. To achieve accurate monitoring of the fuel flow rate into the fuel nozzle 4, a first flow monitoring component is installed on the first oil passage. This component can detect the flow rate of heavy fuel oil entering the fuel nozzle 4 through the first oil passage 9 in real time, providing data support for accurate calculation of heavy fuel oil consumption and ensuring effective monitoring of the fuel inlet process of the fuel nozzle 4.

[0026] The opening and closing of the second oil port 8 is achieved by the movement of the first ceramic ball 30, which is controlled by the first cylinder 31. When the first ceramic ball 30 closes the second oil port 8, the first oil passage 9 and the third oil passage 19 are connected; when the first ceramic ball 30 opens the second oil port 8, the first oil passage 9 and the third oil passage 19 are closed.

[0027] Furthermore, the first flow monitoring component includes a first three-way valve 11 and a first flow meter 12. The first valve port of the first three-way valve 11 is connected to the oil inlet pipeline 2, the second valve port of the first three-way valve 11 is connected to the first oil port 7 through the first flow meter 12, and the third valve port of the first three-way valve 11 is connected to the first oil passage 9 between the first flow meter 12 and the first oil port 7.

[0028] Specifically, the first three-way valve 11 is located on the first oil passage 9. The first three-way valve 11 has three valve ports. The first valve port is directly connected to the oil inlet pipe 2, serving as the inlet for heavy oil to enter the component. The second valve port is connected to the fuel nozzle body 4 through the first flow meter 12, allowing heavy oil to flow through the first flow meter 12 and enter the first oil port 7. The third valve port is connected to the first oil passage between the first flow meter 12 and the first oil port 7, forming a bypass path.

[0029] When the first injection system is working normally, the first and second valve ports of the first three-way valve 11 are open while the third valve port is closed. Heavy oil in the heavy oil tank 1 enters the fuel nozzle 4 through the inlet pipe 2, the first three-way valve 11, and the first flow meter 12 via the first oil port 7. At the same time, the flow rate of the heavy oil is measured by the first flow meter 12. Because the heavy oil needs to be preheated before combustion to meet the viscosity requirements, the preheating of the heavy oil needs to be carried out in the circulation path. Since the state of the heavy oil is unstable during the preheating process, the flow through the first flow meter 12 can easily lead to inaccurate measurement data.

[0030] Subsequent monitoring errors occurred; therefore, when in the preheating state, the first and third valve ports of the first three-way valve 11 are connected and the second valve port is closed. The heavy oil in the heavy oil tank 1 passes through the oil inlet pipe 2 and the first three-way valve 11 and enters the first oil port 7 through the bypass path, bypassing the first flow meter 12 to avoid detection errors.

[0031] Furthermore, the fuel nozzle 4 also includes a first air port 13 and a second air port 14; the first fuel injection system also includes a pressure supply assembly, which includes: A first air compressor 15, a first air passage 16, and a second air passage 17, wherein the first air passage 16 connects the first air port 13 and the first air compressor 15, and the second air passage 17 connects the second air port 14 and the injection head 5.

[0032] Specifically, the first air port 13 serves as the air inlet of the fuel nozzle 4, and the second air port 14 serves as the air outlet of the fuel nozzle 4. The first air port 13 is connected to the first air compressor 15 through the first air passage 16, forming an airflow channel from the first air compressor 15 to the interior of the fuel nozzle 4; the first air compressor 15 serves as an air source device, capable of continuously outputting high-pressure air; the second air port 14 is connected to the injector head 5 through the second air passage 17, forming an airflow passage between the fuel nozzle 4 and the injector head 5.

[0033] When the first injection system is working normally, the high-pressure air generated by the first air compressor 15 enters the fuel gun body 4 through the first air passage 16 and the first air port 13. Then, the high-pressure air enters the second air passage 17 through the second air port 14 and finally reaches the injection head 5, where it mixes with the heavy oil delivered to the injection head 5 through the second oil passage 10 to assist the injection head 5 in injecting heavy oil into the regenerator. The air pressure helps the heavy oil achieve a better atomization effect, so that the heavy oil injected into the regenerator burns more completely.

[0034] Furthermore, the fuel nozzle 4 also includes a third fuel port 18, which is connected to the return fuel line 3 via a third fuel line 19, and a first ball valve 20 is provided on the third fuel line 19; the pressure supply assembly also includes: The second three-way valve 21 is located on the first oil passage 9. The first valve port and the second valve port of the second three-way valve 21 are respectively connected to the oil inlet pipe 2 and the first valve port of the first three-way valve 11. The second ball valve 22 is located on the second air passage 17.

[0035] Specifically, the third oil port 18 serves as the return oil port of the fuel nozzle 4. It is connected to the return oil pipeline 3 via the third oil passage 19, forming a heavy oil return channel. A first ball valve 20 is installed at the end of the third oil passage 19 near the third oil port 18. By opening or closing the first ball valve 20, the on / off state of the third oil passage 19 can be controlled, so that the heavy oil remaining in the fuel nozzle 4 can be guided back to the heavy oil tank 1 via the return oil pipeline 3 when needed, thus preventing the heavy oil from drying out in the fuel nozzle 4. A first check valve 29 is installed at the end of the third oil passage 19 near the return oil pipeline 3. The first check valve 29 can control the third oil passage 19 to flow unidirectionally from the third oil port 18 to the return oil pipeline 3, thus preventing heavy oil from entering the third oil passage 19 when the second injection system returns oil.

[0036] The second three-way valve 21 is installed on the first oil circuit 9. Its first valve port is connected to the oil inlet pipe 2, its second valve port is connected to the first valve port of the first three-way valve 11, and its third valve port is connected to the first air compressor 15. By switching the valve port conduction state of the second three-way valve 21, the first injection system can be switched between normal working mode and cleaning mode.

[0037] When the first injection system is in normal operating mode, the first and second valve ports of the second three-way valve 21 are connected, the third valve port is closed, and the first air port 13 is in the open state. The high-pressure air provided by the first air compressor 15 enters the combustion gun body 4 through the first air port 13, and then enters the injection head 5 through the second air port 14. When the first injection system is in purge mode, the second and third valve ports of the second three-way valve 21 are connected, the first valve port is closed, and the first air port 13 is closed. The high-pressure air provided by the first air compressor 15 enters the first three-way valve 11 after passing through the second three-way valve 21. The first and third valve ports of the first three-way valve 11 are connected, the second valve port of the first three-way valve 11 is closed, and the high-pressure air enters the fuel gun body 4 through the bypass path after passing through the first three-way valve 11, so as to return the heavy oil remaining in the first oil passage 9 and the fuel gun body 4 to the heavy oil tank 1 through the third oil passage 19 and the return oil line 3, which plays a role in cleaning the residual heavy oil and preventing the heavy oil from drying out and affecting subsequent use.

[0038] The second ball valve 22 is installed on the second air passage 17 and is used to control the opening and closing of the second air passage 17. When the first injection system is in normal operating mode, the second ball valve 22 is open; when the first injection system is in purge mode, the second ball valve 22 is closed.

[0039] Furthermore, the pressure supply assembly also includes a third air passage 23, which connects the first air compressor 15 and the second oil passage 10, and a third ball valve 24 is provided on the third air passage 23.

[0040] Specifically, the third air passage 23 connects the first air compressor 15 and the second oil passage 10, forming an independent airflow channel from the first air compressor 15 to the heavy oil delivery pipeline. A third ball valve 24 is installed on the third air passage 23, and the on / off state of the third air passage 23 can be controlled by operating the opening or closing of the third ball valve 24.

[0041] In addition to cleaning the fuel nozzle 4, the injection head 5 also needs to be cleaned in a timely manner. Therefore, when the first injection system is in the purging mode, the third ball valve 24 is opened, and the high-pressure air provided by the first air compressor 15 enters the injection head 5 through the third air passage 23 and the second oil passage 10, so as to directly spray the heavy oil remaining inside the injection head 5 outward through the injection head 5.

[0042] Furthermore, the first oil circuit 9 is also equipped with a first booster pump 25, which is located between the second valve port of the second three-way valve 21 and the first valve port of the first three-way valve 11.

[0043] Specifically, the first booster pump 25 is connected in series in the path of heavy oil flowing from the second three-way valve 21 to the first three-way valve 11, and is used to pressurize the heavy oil passing through this section of the first oil circuit 9 to meet the specific injection pressure requirements.

[0044] Furthermore, a fourth ball valve 26 is provided between the third valve port of the second three-way valve 21 and the first air compressor 15.

[0045] Specifically, the fourth ball valve 26 is connected in series in the air passage between the second three-way valve 21 and the first air compressor 15. The opening and closing of the fourth ball valve 26 controls the flow of this section of the air passage. The fourth ball valve 26 is closed when the first injection system is in non-purge mode, further preventing heavy oil from entering the first air compressor 15 through this section of the air passage.

[0046] Furthermore, the oil inlet pipeline 2 is equipped with a primary filter 27 and a secondary filter 28, wherein the filtration accuracy of the secondary filter 28 is greater than that of the primary filter 27.

[0047] Specifically, the primary filter 27 and the secondary filter 28 are connected in series on the oil inlet pipe 2 to ensure that the heavy oil undergoes two stages of filtration between the first injection system and the second injection system, thus preventing impurities in the heavy oil from causing pipe blockage or equipment wear.

[0048] Furthermore, the main fuel nozzle 6 is equipped with a fourth fuel port 32, a fifth fuel port 33, a third air port 36, and an injection port 47. The fourth fuel port 32 is connected to the fuel inlet pipe 2 via the fourth oil passage 34, the fifth fuel port 33 is connected to the return oil passage 3 via the fifth oil passage 35, and the injection port 47 is used to inject heavy fuel oil from the main fuel nozzle 6. Along the direction from the fuel inlet pipe 2 to the fourth fuel port 32, the fourth oil passage 35 is connected in series with a third three-way valve 38, a second booster pump 44, a fourth three-way valve 39, and a second flow meter 41. The first valve port of the third three-way valve is connected to the fuel inlet pipe 2, the second valve port is connected to the second booster pump 44, and the third valve port is connected to the second air compressor 43. The first valve port of the fourth three-way valve 39 is connected to the second booster pump 44, the second valve port is connected to the second flow meter 41, and the third valve port is connected via a bypass path to the fourth oil passage 34 between the second flow meter 41 and the fourth fuel port 32. The second air compressor 43 is connected to the third air port 36 via the fourth air passage 37. The fourth air passage 37 serves as a high-pressure air path between the second air compressor 43 and the main fuel nozzle 6, allowing high-pressure air to enter the main fuel nozzle 6 to assist heavy fuel injection. A fifth three-way valve 40 and a third flow meter 42 are connected in series along the fifth oil passage 35 from the fifth oil port 33 to the return oil line 3. The first valve port of the fifth three-way valve 40 is connected to the fifth oil port 33, the second valve port is connected to the third flow meter 42, and the third valve port is connected to the fifth oil passage 35 between the third flow meter 42 and the return oil line 3 via a bypass path. A fifth ball valve 45 is installed on the air passage between the third three-way valve 38 and the second air compressor 43. A second check valve 46 is installed at the end of the fifth oil passage 35 near the return oil line 3, controlling the unidirectional flow of the fifth oil passage 35 from the fifth oil port 33 to the return oil line 3. A second ceramic ball 48 is installed at the position of the injection port 47. The movement of the second ceramic ball 48 is controlled by the second cylinder 49. When the second ceramic ball 48 closes the injection port 47, all the heavy oil entering the main fuel gun 6 from the fourth oil port 32 flows back from the fifth oil port 33. When the second ceramic ball 48 opens the injection port 47, most of the heavy oil entering the main fuel gun 6 from the fourth oil port 32 is injected from the injection port 47, and a small portion of the heavy oil flows back from the fifth oil port 33.

[0049] Specifically, the second injection system also includes a preheating mode, a working mode, and a cleaning mode.

[0050] When the second injection system is in preheating mode, the fuel injector 47, the third air port 36, the fifth ball valve 45, and the second air compressor 43 are all closed. On the fourth oil circuit 34, the first and second valve ports of the third three-way valve 38 are connected, and the third valve port of the third three-way valve 38 is closed. At this time, the heavy oil flows to the second booster pump 44 after passing through the third three-way valve 38. After being boosted by the second booster pump 44, the heavy oil flows to the fourth three-way valve 39. The first and third valve ports of the fourth three-way valve 39 are connected, and the second valve port of the fourth three-way valve 39 is closed. The heavy oil enters the main fuel nozzle 6 through the bypass path of the fourth three-way valve 39. On the fifth oil circuit 35, the first and third valve ports of the fifth three-way valve 40 are connected, and the second valve port of the fifth three-way valve 40 is closed. The heavy oil flows back to the heavy oil tank 1 through the bypass path after passing through the fifth three-way valve 40.

[0051] When the second injection system is in working mode, the fuel injector 47, the third air port 36, and the second air compressor 43 are all open, and the fifth ball valve 45 is closed. On the fourth oil circuit 34, the first and second valve ports of the third three-way valve 38 are connected, and the third valve port of the third three-way valve 38 is closed. At this time, the heavy oil flows to the second booster pump 44 after passing through the third three-way valve 38. After being boosted by the second booster pump 44, the heavy oil flows to the fourth three-way valve 39. The first and second valve ports of the fourth three-way valve 39 are connected, and the third valve port of the fourth three-way valve 39 is closed. The heavy oil enters the main fuel nozzle 6 through the second flow meter 41. On the fifth oil circuit 35, the first and second valve ports of the fifth three-way valve 40 are connected, and the third valve port of the fifth three-way valve 40 is closed. The heavy oil flows back to the heavy oil tank 1 after passing through the third flow meter 42. When in working mode, the inlet oil flow and return oil flow are monitored by the second flow meter 41 and the third flow meter 42 respectively, and the actual heavy oil flow is calculated based on the inlet oil flow and return oil flow.

[0052] When the second injection system is in purge mode, the fuel injector 47 and the third air port 36 are closed, while the fifth ball valve 45 and the second air compressor 43 are open. On the fourth oil circuit 34, the second and third ports of the third three-way valve 38 are connected, and the first port of the third three-way valve 38 is closed. The high-pressure air supplied by the second air compressor 43 passes sequentially through the fifth ball valve 45, the third three-way valve 38, and the second booster pump 44 into the fourth three-way valve 39. The first and third ports of the fourth three-way valve 39 are connected, and the second port of the fourth three-way valve 39 is closed. The high-pressure air enters the main fuel nozzle 6 through the bypass path of the third three-way valve 39. On the fifth oil circuit 35, the first and third ports of the fifth three-way valve 40 are connected, and the second port of the fifth three-way valve 40 is closed. The high-pressure air from the main fuel nozzle 6 flows back to the heavy oil tank 1 through the bypass path of the fifth three-way valve 40. The high-pressure air cleans the residual heavy oil.

[0053] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An integrated fuel flow meter control system for an asphalt mixing plant, used to monitor the heavy oil flow rate of the primary burner and the regenerated burner, characterized in that, It includes a heavy oil tank (1), a first oil injection system and a second oil injection system, wherein the heavy oil tank (1) is connected to an oil inlet pipe (2) and an oil return pipe (3). The first fuel injection system includes a fuel gun body (4) and an injection head (5). The fuel gun body (4) is located outside the regenerator, and the injection head (5) is located inside the regenerator. The fuel gun body (4) is connected to the heavy oil tank (1) through the fuel inlet pipe (2) to pressurize the heavy oil and deliver it to the injection head (5) so that the injection head (5) injects oil into the regenerator. The first fuel injection system calculates the heavy oil flow rate based on the fuel inlet flow rate of the fuel gun body (4). The second fuel injection system includes a fuel main gun (6), which is located inside the primary burner and connected to the heavy oil tank (1) through the oil inlet pipe (2) and the oil return pipe (3) for injecting fuel into the primary burner; the second fuel injection system calculates the heavy oil flow rate by the difference between the oil inlet flow rate and the oil return flow rate of the fuel main gun (6).

2. The integrated asphalt mixing plant fuel flow meter control system according to claim 1, characterized in that, The fuel nozzle (4) includes a first oil port (7) and a second oil port (8). The first oil port (7) is connected to the oil inlet pipe (2) through a first oil passage (9), and the second oil port (8) is connected to the injection head (5) through a second oil passage (10). A first flow monitoring component for detecting the oil flow rate of the fuel nozzle (4) is provided on the first oil passage (9).

3. The integrated asphalt mixing plant fuel flow meter control system according to claim 2, characterized in that, The first flow monitoring component includes a first three-way valve (11) and a first flow meter (12). The first valve port of the first three-way valve (11) is connected to the oil inlet pipeline (2). The second valve port of the first three-way valve (11) is connected to the first oil port (7) through the first flow meter (12). The third valve port of the first three-way valve (11) is connected to the first oil passage (9) between the first flow meter (12) and the first oil port (7).

4. The integrated asphalt mixing plant fuel flow meter control system according to claim 3, characterized in that, The fuel nozzle (4) further includes a first air port (13) and a second air port (14); the first fuel injection system further includes a pressure supply assembly, which includes: A first air compressor (15), a first air passage (16), and a second air passage (17), wherein the first air passage (16) is connected to the first air port (13) and the first air compressor (15), and the second air passage (17) is connected to the second air port (14) and the injector (5).

5. The integrated asphalt mixing plant fuel flow meter control system according to claim 4, characterized in that, The fuel nozzle (4) also includes a third oil port (18), which is connected to the return oil line (3) via a third oil passage (19). A first ball valve (20) is provided on the third oil passage (19). The pressure supply assembly also includes: The second three-way valve (21) is located on the first oil circuit (9). The first valve port and the second valve port of the second three-way valve (21) are respectively connected to the oil inlet pipeline (2) and the first valve port of the first three-way valve (11). The third valve port of the second three-way valve (21) is connected to the first air compressor (15). The second ball valve (22) is located on the second air passage (17).

6. The integrated asphalt mixing plant fuel flow meter control system according to claim 5, characterized in that, The pressure supply assembly also includes a third air passage (23), which connects the first air compressor (15) and the second oil passage (10), and a third ball valve (24) is provided on the third air passage (23).

7. The integrated asphalt mixing plant fuel flow meter control system according to claim 6, characterized in that, The first oil circuit (9) is also equipped with a first booster pump (25), which is located between the second valve port of the second three-way valve (21) and the first valve port of the first three-way valve (11).

8. The integrated asphalt mixing plant fuel flow meter control system according to claim 7, characterized in that, A fourth ball valve (26) is also provided between the third valve port of the second three-way valve (21) and the first air compressor (15).

9. The integrated asphalt mixing plant fuel flow meter control system according to claim 8, characterized in that, The oil inlet pipeline (2) is equipped with a primary filter (27) and a secondary filter (28), and the filtration accuracy of the secondary filter (28) is greater than that of the primary filter (27).

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