Heavy oil flow control system of internal circulation fuel oil main gun burner

Abstract

The utility model provides a heavy oil flow control system of an internal circulation fuel oil main gun burner, which comprises a heavy oil tank and a fuel oil main gun, an oil inlet of the fuel oil main gun is communicated with the heavy oil tank through an oil inlet pipeline, and an oil return port of the fuel oil main gun is communicated with the heavy oil tank through an oil return pipeline; a purging three-way valve and an oil inlet three-way valve are arranged on the oil inlet pipeline, a first valve port of the purging three-way valve is communicated with the filtering assembly, a second valve port of the purging three-way valve is communicated with an air inlet of the fuel oil main gun through an air compressor, a third valve port of the purging three-way valve is communicated with a first valve port of the oil inlet three-way valve, and a second valve port of the oil inlet three-way valve is communicated with the oil inlet; a third valve port of the three-way valve is communicated with the oil inlet through an oil inlet flowmeter; an oil return three-way valve is arranged on the oil return pipeline, a first valve port of the oil return three-way valve is communicated with the oil return port, a second valve port of the oil return three-way valve is communicated with the heavy oil tank, and a third valve port of the oil return three-way valve is communicated with the heavy oil tank through an oil return flowmeter. The control system provided by the utility model is simple in structure and convenient to clean and blow.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of asphalt mixing, in particular to a heavy oil flow control system of an inner circulating fuel oil main gun burner. BACKGROUND

[0002] The asphalt concrete mixing station is a mechanical equipment for professional production of asphalt concrete, which is widely used in highway, airport and other projects requiring paving of asphalt concrete pavement. The burner is used to dry the dry cylinder aggregate, so as to evaporate the moisture and asphalt mixture. The burner is a heavy oil burner with an inner circulating main gun. The heavy oil has high viscosity and many impurities. When it is atomized and burned, it needs to be heated to a certain temperature to reduce its viscosity.

[0003] When the burner burns heavy oil, the consumption of heavy oil needs to be counted in advance. The traditional heavy oil flow control system directly counts through the oil inlet flowmeter and oil return flowmeter. However, before the heavy oil is burned, the heavy oil needs to be preheated. When the heavy oil flows through the oil inlet flowmeter and oil return flowmeter during preheating, it is easy to cause statistical error, and it is not convenient to clean the oil inlet pipeline and oil return pipeline after burning. CONTENT OF THE INVENTION

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide a heavy oil flow control system of an inner circulating fuel oil main gun burner to solve the above problems.

[0005] The present application provides a heavy oil flow control system of an inner circulating fuel oil main gun burner, comprising:

[0006] A heavy oil tank and a fuel oil main gun, the oil inlet of the fuel oil main gun is communicated with the heavy oil tank through an oil inlet pipeline, the oil return port of the fuel oil main gun is communicated with the heavy oil tank through an oil return pipeline, and the fuel oil main gun is provided with an oil injection port;

[0007] The oil inlet pipeline is provided with a filter assembly, a blow cleaning tee valve and an oil inlet tee valve, the first valve port of the blow cleaning tee valve is communicated with the filter assembly, the second valve port of the blow cleaning tee valve is communicated with the air compressor and the air inlet of the fuel oil main gun, the third valve port of the blow cleaning tee valve is communicated with the first valve port of the oil inlet tee valve, the second valve port of the oil inlet tee valve is communicated with the oil inlet, and the third valve port of the tee valve is communicated with the oil inlet through an oil inlet flowmeter;

[0008] The oil return pipeline is provided with an oil return tee valve, the first valve port of the oil return tee valve is communicated with the oil return port, the second valve port of the oil return tee valve is communicated with the heavy oil tank, and the third valve port of the oil return tee valve is communicated with the heavy oil tank through an oil return flowmeter.

[0009] According to the technical scheme provided in the embodiment of the present application, the filter assembly comprises a first filter and a second filter, the second filter is arranged at one end of the first filter close to the cleaning and blowing three-way valve, and the filtering precision of the second filter is greater than that of the first filter.

[0010] According to the technical scheme provided in the embodiment of the present application, a cleaning and blowing ball valve is further arranged between the second valve port of the cleaning and blowing three-way valve and the air compressor.

[0011] According to the technical scheme provided in the embodiment of the present application, a heavy oil booster pump is further arranged between the third valve port of the cleaning and blowing three-way valve and the first valve port of the oil inlet three-way valve.

[0012] According to the technical scheme provided in the embodiment of the present application, a control module is further arranged, the control module is electrically connected with the fuel main gun, the cleaning and blowing three-way valve, the oil inlet three-way valve, the oil return three-way valve, the cleaning and blowing ball valve, the heavy oil booster pump and the air compressor, and the control module is used for controlling the on-off of the fuel main gun, the heavy oil booster pump and the air compressor and the state switching of each valve.

[0013] According to the technical scheme provided in the embodiment of the present application, the control system comprises a preheating mode, when in the preheating mode, only the first valve port and the third valve port of the cleaning and blowing three-way valve are communicated, only the first valve port and the second valve port of the oil inlet three-way valve are communicated, only the first valve port and the second valve port of the oil return three-way valve are communicated, the cleaning and blowing ball valve is closed, and the air compressor is closed.

[0014] According to the technical scheme provided in the embodiment of the present application, the control system further comprises a working mode, when in the working mode, only the first valve port and the third valve port of the cleaning and blowing three-way valve are communicated, only the first valve port and the third valve port of the oil inlet three-way valve are communicated, only the first valve port and the third valve port of the oil return three-way valve are communicated, the cleaning and blowing ball valve is closed, and the air compressor is opened.

[0015] According to the technical scheme provided in the embodiment of the present application, the control system further comprises a cleaning and blowing mode, when in the cleaning and blowing mode, only the second valve port and the third valve port of the cleaning and blowing three-way valve are communicated, only the first valve port and the second valve port of the oil inlet three-way valve are communicated, only the first valve port and the second valve port of the oil return three-way valve are communicated, the cleaning and blowing ball valve is opened, and the air compressor is opened.

[0016] Compared with the prior art, the beneficial effects of the present application are that: by setting the oil inlet flow meter and the oil return flow meter, the heavy oil consumption can be accurately counted; by setting the filter assembly, the fuel entering the main fuel gun of the heavy oil tank can be filtered, reducing the risk of equipment wear and blockage; by setting the clean blowing three-way valve, the oil inlet three-way valve, the oil return three-way valve and the air compressor, when it is necessary to circulate and preheat the heavy oil through the main fuel gun, the first valve port and the third valve port of the clean blowing three-way valve are connected, the first valve port and the second valve port of the oil inlet three-way valve are connected, and the first valve port and the second valve port of the oil return three-way valve are connected, so as to avoid affecting the statistical error when the heavy oil is preheated through the oil inlet flow meter and the oil return flow meter; when entering the normal working state, the first valve port and the third valve port of the clean blowing three-way valve are connected, the first valve port and the third valve port of the oil inlet three-way valve are connected, the first valve port and the third valve port of the oil return three-way valve are connected, and the air compressor is started to provide air for the main fuel gun, so that the heavy oil can pass through the oil inlet flow meter and the oil return flow meter for consumption statistics; when it is necessary to clean the pipeline, the second valve port and the third valve port of the clean blowing three-way valve are connected, the first valve port and the second valve port of the oil inlet three-way valve are connected, the first valve port and the second valve port of the oil return three-way valve are connected, and the air compressor is started to provide high pressure air, so that the high pressure air enters the oil inlet three-way valve through the clean blowing three-way valve, then enters the main fuel gun through the oil inlet three-way valve, and finally returns to the heavy oil tank through the oil return three-way valve, and the high pressure gas bypasses the oil inlet flow meter and the oil return flow meter, realizing pipeline cleaning without damaging the oil inlet flow meter and the oil return flow meter. BRIEF DESCRIPTION OF DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0018] Figure 1 The structure schematic diagram of the heavy oil flow control system of the internal circulation main fuel gun burner provided by the present application is shown in the figure;

[0019] Figure 2 The structure schematic diagram of the internal circulation main fuel gun burner provided by the present application is shown in the figure; Figure 1 The structure schematic diagram of the amplification of A in the control system shown in the figure is shown in the figure;

[0020] Figure 3 The principle diagram of the control system shown in the figure in the preheating mode is shown in the figure; Figure 1 The principle diagram of the control system shown in the figure in the working mode is shown in the figure;

[0021] Figure 4 The principle diagram of the control system shown in the figure in the cleaning mode is shown in the figure. Figure 1

[0022] Figure 5 The principle diagram of the control system shown in the figure in the cleaning mode is shown in the figure. Figure 1

[0023] ​​Fig. 1 is a heavy oil tank; Fig. 2 is a fuel main gun; Fig. 3 is an oil inlet; Fig. 4 is an oil inlet pipeline; Fig. 5 is an oil return port; Fig. 6 is an oil return pipeline; Fig. 7 is a filter assembly; Fig. 8 is a blow cleaning tee valve; Fig. 9 is an oil inlet tee valve; Fig. 10 is an air compressor; Fig. 11 is an air inlet; Fig. 12 is an oil inlet flowmeter; Fig. 13 is an oil return tee valve; Fig. 14 is an oil return flowmeter; Fig. 15 is a primary filter; Fig. 16 is a secondary filter; Fig. 17 is a blow cleaning ball valve; Fig. 18 is a heavy oil booster pump; Fig. 19 is an air inlet pipeline; Fig. 20 is an oil injection port; Fig. 21 is a cylinder; and Fig. 22 is a ceramic ball. DETAILED DESCRIPTION

[0024] The application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the application and are not limiting of the application. In addition, it should be noted that only parts related to the application are shown in the drawings for the purpose of description.

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] Reference should be made to Figure 1 The present application provides a heavy oil flow control system of an internal circulation fuel main gun burner, comprising:

[0027] A heavy oil tank 1 and a fuel main gun 2, an oil inlet 3 of the fuel main gun 2 is communicated with the heavy oil tank 1 through an oil inlet pipeline 4, an oil return port 5 of the fuel main gun 2 is communicated with the heavy oil tank 1 through an oil return pipeline 6, and the fuel main gun 2 is provided with an oil injection port 20;

[0028] The oil inlet pipeline 4 is provided with a filter assembly 7, a blow cleaning tee valve 8 and an oil inlet tee valve 9, a first valve port of the blow cleaning tee valve 8 is communicated with the filter assembly 7, a second valve port of the blow cleaning tee valve 8 is communicated with an air inlet 11 of the fuel main gun 2 through an air compressor 10, a third valve port of the blow cleaning tee valve 8 is communicated with a first valve port of the oil inlet tee valve 9, a second valve port of the oil inlet tee valve 9 is communicated with the oil inlet 3, and a third valve port of the tee valve is communicated with the oil inlet 3 through an oil inlet flowmeter 12;

[0029] The oil return pipeline 6 is provided with an oil return tee valve 13, a first valve port of the oil return tee valve 13 is communicated with the oil return port 5, a second valve port of the oil return tee valve 13 is communicated with the heavy oil tank 1, and a third valve port of the oil return tee valve 13 is communicated with the heavy oil tank 1 through an oil return flowmeter 14.

[0030] Specifically, the fuel main gun 2 is provided with an oil inlet 3 and an air inlet 11 which can be freely opened and closed, and the fuel main gun 2 is also provided with a return oil port 5 and an oil injection port 20 which communicate with the oil inlet 3 and the air inlet 11, wherein the oil inlet 3, the air inlet 11 and the oil injection port 20 can be independently opened and closed, and the return oil port 5 is used for the fuel main gun 2 to return oil to the heavy oil tank 1; the oil inlet 3 communicates with the heavy oil tank 1 through an oil inlet pipeline 4 to realize oil supply from the heavy oil tank 1 to the fuel main gun 2, the return oil port 5 communicates with the heavy oil tank 1 through a return oil pipeline 6, the air inlet 11 is used for conveniently supplying air to the fuel main gun 2 to make the heavy oil atomized and then sprayed out of the oil injection port 20, and is also used for cleaning and blowing the fuel main gun 2. The oil inlet pipeline 4 and the return oil pipeline 6 are respectively provided with an oil inlet flowmeter 12 and a return oil flowmeter 14, and when the heavy oil in the fuel main gun 2 is burned, the consumption of the heavy oil can be counted according to the oil inlet amount counted by the oil inlet flowmeter 12 and the return oil amount counted by the return oil flowmeter 14.

[0031] The opening and closing of the oil injection port 20 are controlled by a cylinder 21, as shown in Figure 1 and Figure 2 , the cylinder 21 is installed on the fuel main gun 2, a ceramic ball 22 is installed at the free end of the cylinder 21, and the cylinder 21 has a first state and a second state; when the cylinder 21 is in the first state, the cylinder 21 drives the ceramic ball 22 to move to open the oil injection port 20, at this time, most of the heavy oil entering from the oil inlet 3 is atomized and then sprayed out of the oil injection port 20, and a small part of the heavy oil returns to the heavy oil tank 1 through the return oil port 5; when the cylinder 21 is in the second state, the cylinder 21 drives the ceramic ball 22 to move to close to seal the oil injection port 20, at this time, the heavy oil entering from the oil inlet 3 completely returns to the heavy oil tank 1 through the return oil port 5. No matter the cylinder 21 is in the first state or the second state, the return oil port 5 is always in an open state, the difference is that the return oil amount returning through the return oil port 5 is different with the opening and closing of the oil injection port 20.

[0032] The filter assembly 7 is arranged on the oil inlet pipeline 4 and is used to filter the heavy oil supplied by the heavy oil tank 1 to the fuel main gun 2, so as to reduce the equipment wear and the risk of blockage. The clean blow three-way valve 8 and the oil inlet three-way valve 9 are arranged on the oil inlet pipeline 4. The first valve port, the second valve port and the third valve port of the clean blow three-way valve 8 can be communicated with each other in pairs. The first valve port, the second valve port and the third valve port of the oil inlet three-way valve 9 can be communicated with each other in pairs. The first valve port of the clean blow three-way valve 8 is communicated with the filter assembly 7 through the oil inlet pipeline 4. The second valve port of the clean blow three-way valve 8 is communicated with the air compressor 10 through the air inlet pipeline 19. The air compressor 10 is also communicated with the air inlet 11 through the air inlet pipeline 19. The first valve port of the oil inlet three-way valve 9 is communicated with the third valve port of the clean blow three-way valve 8 through the oil inlet pipeline 4. The second valve port of the oil inlet three-way valve 9 is directly communicated with the oil inlet 3 through the oil inlet pipeline 4. The third valve port of the oil inlet three-way valve 9 is communicated with the inlet of the oil inlet flowmeter 12 through the oil inlet pipeline 4. The outlet of the oil inlet flowmeter 12 is communicated with the oil inlet 3 through the oil inlet pipeline 4. The air compressor 10 provides high-pressure air for the fuel main gun 2 to atomize the auxiliary heavy oil.

[0033] The oil return three-way valve 13 is arranged on the oil return pipeline 6. The first valve port, the second valve port and the third valve port of the oil return three-way valve 13 can be communicated with each other in pairs. The first valve port of the oil return three-way valve 13 is communicated with the oil return port 5 through the oil return pipeline 6. The second valve port of the oil return three-way valve 13 is directly communicated with the heavy oil tank 1 through the oil return pipeline 6. The third valve port of the oil return three-way valve 13 is communicated with the inlet of the oil return flowmeter 14 through the oil return pipeline 6. The outlet of the oil return flowmeter 14 is communicated with the heavy oil tank 1 through the oil return pipeline 6.

[0034] Further, the filter assembly 7 comprises a first filter 15 and a second filter 16. The second filter 16 is arranged at one end of the first filter 15 close to the clean blow three-way valve 8. The filtering precision of the second filter 16 is greater than that of the first filter 15.

[0035] Specifically, the filter assembly 7 realizes two-stage filtering through the first filter 15 and the second filter 16. The filtering precision of the second filter 16 is set to be greater than that of the first filter 15, so that the purpose of filtering the heavy oil can be achieved, and the required flow of the fuel main gun 2 can also be met. In this embodiment, the filtering precision of the first filter 15 is 20 mesh, and the filtering precision of the second filter 16 is 80 mesh.

[0036] Further, the clean blow ball valve 17 is arranged between the second valve port of the clean blow three-way valve 8 and the air compressor 10.

[0037] Specifically, the clean blowing ball valve 17 can realize free opening and closing. By arranging the clean blowing ball valve 17, the connection and disconnection between the second valve port of the clean blowing three-way valve 8 and the air compressor 10 can be controlled. When the oil inlet pipeline 4 does not need to be cleaned, the clean blowing ball valve 17 is always in a closed state, further avoiding heavy oil entering the air compressor 10.

[0038] Further, the third valve port of the clean blowing three-way valve 8 and the first valve port of the oil inlet three-way valve 9 are further provided with a heavy oil booster pump 18.

[0039] Specifically, by arranging the heavy oil booster pump 18, the heavy oil in the oil inlet pipeline 4 can be boosted, and the flow efficiency of the heavy oil is improved.

[0040] Further, the control module is electrically connected with the fuel main gun 2, the clean blowing three-way valve 8, the oil inlet three-way valve 9, the oil return three-way valve 13, the clean blowing ball valve 17, the heavy oil booster pump 18 and the air compressor 10, and is used for controlling the opening and closing of the fuel main gun 2, the heavy oil booster pump 18 and the air compressor 10 and the state switching of each valve.

[0041] Specifically, the control module is further electrically connected with the cylinder 21. By arranging the control module, the opening and closing of the oil inlet port 3, the air inlet port 11 and the oil injection port 20 on the fuel main gun 2 can be controlled, and the switching of the valve ports on the clean blowing three-way valve 8, the oil inlet three-way valve 9 and the oil return three-way valve 13 can be controlled.

[0042] Further, the control system provided by the embodiment includes a preheating mode, a working mode and a clean blowing mode.

[0043] When the control system is in the preheating mode, only the first valve port and the third valve port of the clean blowing three-way valve 8 are connected, only the first valve port and the second valve port of the oil inlet three-way valve 9 are connected, only the first valve port and the second valve port of the oil return three-way valve 13 are connected, the clean blowing ball valve 17 is closed, and the air compressor 10 is closed.

[0044] Please refer to Figure 3 , Figure 3The direction of the hollow arrow is the flow direction of the high-pressure gas, and the direction of the solid arrow is the flow direction of the heavy oil. Specifically, in the working mode, under the control of the control module, the oil inlet 3, the air inlet 11, the oil injection port 20, and the air compressor 10 are opened, and the blow-off ball valve 17 is closed. On the oil inlet pipeline 4, the first valve port and the third valve port of the blow-off three-way valve 8 are communicated, and the second valve port of the blow-off three-way valve 8 is closed. At this time, the heavy oil flows to the heavy oil booster pump 18 after passing through the blow-off three-way valve 8, is pressurized by the heavy oil booster pump 18, and then flows to the oil inlet three-way valve 9. The first valve port and the third valve port of the oil inlet three-way valve 9 are communicated, and the second valve port of the oil inlet three-way valve 9 is closed. At this time, the heavy oil passes through the oil inlet three-way valve 9 and enters the fuel main gun 2 through the oil flow meter 12, and is sprayed out of the oil injection port 20 after being atomized in the fuel main gun 2. On the return oil pipeline 6, the first valve port and the third valve port of the return oil three-way valve 13 are communicated, and the second valve port of the return oil three-way valve 13 is closed. At this time, the heavy oil passes through the return oil three-way valve 13 and returns to the heavy oil tank 1 through the return oil flow meter 14. During the combustion process in the fuel main gun 2, compressed air is provided by the air compressor 10.

[0045] During the preheating process, the heavy oil bypasses the oil inlet flow meter 12 and the return oil flow meter 14, which avoids the influence of the heavy oil on the statistics of the oil inlet flow meter 12 and the return oil flow meter 14, and improves the accuracy of the heavy oil consumption statistics.

[0046] When the control system is in the working mode, the first valve port and the third valve port of the blow-off three-way valve 8 are communicated, the first valve port and the third valve port of the oil inlet three-way valve 9 are communicated, the first valve port and the third valve port of the return oil three-way valve 13 are communicated, the blow-off ball valve 17 is closed, and the air compressor 10 is opened.

[0047] Please refer to Figure 4 , Figure 4 The direction of the hollow arrow is the flow direction of the high-pressure gas, and the direction of the solid arrow is the flow direction of the heavy oil. Specifically, in the working mode, under the control of the control module, the oil inlet 3, the air inlet 11, the oil injection port 20, and the air compressor 10 are opened, and the blow-off ball valve 17 is closed. On the oil inlet pipeline 4, the first valve port and the third valve port of the blow-off three-way valve 8 are communicated, and the second valve port of the blow-off three-way valve 8 is closed. At this time, the heavy oil flows to the heavy oil booster pump 18 after passing through the blow-off three-way valve 8, is pressurized by the heavy oil booster pump 18, and then flows to the oil inlet three-way valve 9. The first valve port and the third valve port of the oil inlet three-way valve 9 are communicated, and the second valve port of the oil inlet three-way valve 9 is closed. At this time, the heavy oil passes through the oil inlet three-way valve 9 and enters the fuel main gun 2 through the oil flow meter 12, and is sprayed out of the oil injection port 20 after being atomized in the fuel main gun 2. On the return oil pipeline 6, the first valve port and the third valve port of the return oil three-way valve 13 are communicated, and the second valve port of the return oil three-way valve 13 is closed. At this time, the heavy oil passes through the return oil three-way valve 13 and returns to the heavy oil tank 1 through the return oil flow meter 14. During the combustion process in the fuel main gun 2, compressed air is provided by the air compressor 10.

[0048] Due to the heavy oil passing through the oil inlet flow meter 12 and the oil return flow meter 14 during the working process, the oil inlet amount and the oil return amount in the working mode can be counted, and the heavy oil consumption can be calculated according to the oil inlet amount and the oil return amount.

[0049] When the control system is in the cleaning mode, the second valve port of the cleaning three-way valve 8 is only communicated with the third valve port, the first valve port of the oil inlet three-way valve 9 is only communicated with the second valve port, the first valve port of the oil return three-way valve 13 is only communicated with the second valve port, the cleaning ball valve 17 is opened, and the air compressor 10 is opened.

[0050] Please refer to Figure 5 , Figure 5 The hollow arrow points to the flow direction of the high-pressure gas. Specifically, to clean the oil inlet pipeline 4 and the oil return pipeline 6, the system needs to be cleaned. In the cleaning mode, under the control of the control module, the oil inlet port 3, the cleaning ball valve 17 and the air compressor 10 are opened, and the air inlet port 11 and the oil injection port 20 are closed. On the oil inlet pipeline 4, the second valve port of the cleaning three-way valve 8 is communicated with the third valve port, and the first valve port of the cleaning three-way valve 8 is closed. At this time, the compressed air provided by the air compressor 10 enters the fuel main gun 2 in sequence through the cleaning ball valve 17, the cleaning three-way valve 8 and the oil inlet three-way valve 9. On the oil return pipeline 6, the first valve port of the oil return three-way valve 13 is communicated with the second valve port, and the third valve port of the oil return three-way valve 13 is closed. The high-pressure air passing through the fuel main gun 2 returns to the heavy oil tank 1 through the oil return three-way valve 13.

[0051] Since the cleaning process is realized by the air compressor 10, the structure related to cleaning is simplified, and the high-pressure gas bypasses the oil inlet flow meter 12 and the oil return flow meter 14 during the cleaning process, so that damage to the inside of the oil inlet flow meter 12 and the oil return flow meter 14 by the high-pressure gas is avoided.

[0052] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features can be replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A heavy oil flow control system for an internally-circulating fuel oil main gun burner, characterized by, The application relates to a heavy oil tank (1) and a fuel main gun (2), an oil inlet (3) of the fuel main gun (2) is communicated with the heavy oil tank (1) through an oil inlet pipeline (4), an oil return port (5) of the fuel main gun (2) is communicated with the heavy oil tank (1) through an oil return pipeline (6), and the fuel main gun (2) is provided with an oil injection port (20). The oil inlet pipeline (4) is provided with a filter assembly (7), a cleaning and blowing three-way valve (8) and an oil inlet three-way valve (9), a first valve port of the cleaning and blowing three-way valve (8) is communicated with the filter assembly (7), a second valve port of the cleaning and blowing three-way valve (8) is communicated with an air inlet (11) of the fuel main gun (2) through an air compressor (10), a third valve port of the cleaning and blowing three-way valve (8) is communicated with a first valve port of the oil inlet three-way valve (9), a second valve port of the oil inlet three-way valve (9) is communicated with the oil inlet (3), and a third valve port of the three-way valve is communicated with the oil inlet (3) through an oil inlet flowmeter (12). The oil return pipeline (6) is provided with an oil return three-way valve (13), a first valve port of the oil return three-way valve (13) is communicated with the oil return port (5), a second valve port of the oil return three-way valve (13) is communicated with the heavy oil tank (1), and a third valve port of the oil return three-way valve (13) is communicated with the heavy oil tank (1) through an oil return flowmeter (14). The filter assembly (7) comprises a primary filter (15) and a secondary filter (16), the secondary filter (16) is arranged at one end of the primary filter (15) close to the cleaning and blowing three-way valve (8), and the filtering precision of the secondary filter (16) is higher than that of the primary filter (15).

2. The heavy oil flow control system of an inner-circulation fuel main gun combustor according to claim 1, characterized by, A cleaning and blowing ball valve (17) is further arranged between the second valve port of the cleaning and blowing three-way valve (8) and the air compressor (10).

3. The heavy fuel flow control system for an internally-circulating fuel main gun combustor of claim 2, wherein, A heavy oil booster pump (18) is further arranged between the third valve port of the cleaning and blowing three-way valve (8) and the first valve port of the oil inlet three-way valve (9).

4. The heavy fuel flow control system for an internally-circulating fuel main gun combustor of claim 3, wherein, The application further comprises a control module, the control module is electrically connected with the fuel main gun (2), the cleaning and blowing three-way valve (8), the oil inlet three-way valve (9), the oil return three-way valve (13), the cleaning and blowing ball valve (17), the heavy oil booster pump (18) and the air compressor (10), and the control module is used for controlling the on-off of the fuel main gun (2), the heavy oil booster pump (18) and the air compressor (10) and the state switching of various valves.

5. The heavy fuel flow control system for an internally-circulating fuel main gun combustor of claim 4, wherein, The control system comprises a preheating mode, when in the preheating mode, only the first valve port and the third valve port of the cleaning and blowing three-way valve (8) are in conduction, only the first valve port and the second valve port of the oil inlet three-way valve (9) are in conduction, only the first valve port and the second valve port of the oil return three-way valve (13) are in conduction, the cleaning and blowing ball valve (17) is closed, and the air compressor (10) is closed.

6. The heavy fuel flow control system for an internally-circulating fuel main gun combustor of claim 5, wherein, The control system further comprises a working mode, when in the working mode, only the first valve port and the third valve port of the cleaning and blowing three-way valve (8) are in conduction, only the first valve port and the third valve port of the oil inlet three-way valve (9) are in conduction, only the first valve port and the third valve port of the oil return three-way valve (13) are in conduction, the cleaning and blowing ball valve (17) is closed, and the air compressor (10) is opened.

7. The heavy fuel flow control system for an internally-circulating fuel main gun combustor of claim 6, wherein, ​ 8. The heavy fuel flow control system for an internally-circulating fuel main gun combustor of claim 7, wherein, The control system further comprises a purging mode, in which the second valve port and the third valve port of the purging three-way valve (8) are communicated, the first valve port and the second valve port of the oil inlet three-way valve (9) are communicated, the first valve port and the second valve port of the oil return three-way valve (13) are communicated, the purging ball valve (17) is opened, and the air compressor (10) is started.

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