An explosion-proof diesel engine exhaust cooling system

Abstract

The invention relates to the technical field of exhaust gas cooling, and discloses an explosion-proof diesel engine exhaust gas cooling system, wherein one end of a compressor is connected to an intercooler, one end of the intercooler is connected to an air compressor, the air compressor is respectively connected to a turbine and an explosion-proof water tank, one end of the turbine is connected to a post-processor, one end of the post-processor is connected to the explosion-proof water tank, the explosion-proof water tank is connected to a water supply tank through a pipeline, a temperature sensor is installed on the explosion-proof water tank, and an exhaust gas cooling unit is arranged on the explosion-proof water tank; compared with a wet cooling method, the exhaust gas cooling system has low exhaust back pressure of the diesel engine, reduces energy loss of the diesel engine, saves cooling water consumption and prevents back suction of water, avoids water inflow into the diesel engine post-processing system and cylinder, and avoids major failures; and compared with a dry cooling method, the cooling system has a small volume, a simple system structure, no deterioration of the coolant effect due to carbon deposition inside, and a simple structure and easy cleaning.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust gas cooling, in particular to an explosion-proof diesel engine exhaust gas cooling system. Background Art

[0002] At present, the working conditions in domestic coal mines are bad, and the air contains methane and combustible dust, so explosion-proof diesel engines are needed to work underground. They will not ignite gas and methane in explosive environments. Therefore, the exhaust temperature is required to be less than 70°C. The exhaust gas cooling methods currently used are: 1. Wet cooling, cooling the exhaust gas in water; 2. Dry cooling, cooling the exhaust gas in a water-cooled cooler.

[0003] At present, conventional explosion-proof diesel engine exhaust cooling methods are divided into wet cooling and dry cooling. Wet cooling will cause large exhaust back pressure of the diesel engine, large water consumption and exhaust pipe water backflow, and dry cooling will cause large cooler volume and reduced heat exchange efficiency. In order to solve the above problems, an explosion-proof diesel engine exhaust cooling system is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide an explosion-proof diesel engine exhaust cooling system to solve the problems mentioned in the above background technology that the conventional explosion-proof diesel engine exhaust cooling methods are divided into wet cooling and dry cooling, because wet cooling will cause large diesel engine exhaust back pressure, large water consumption and exhaust pipe water backflow, and dry cooling has a large cooler volume and reduced heat exchange efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an explosion-proof diesel engine exhaust cooling system, comprising an air filter, the air filter is connected to a compressor, one end of the compressor is connected to an intercooler, one end of the intercooler is connected to an air compressor, the air compressor is respectively connected to a turbine and an explosion-proof water tank, one end of the turbine is connected to a post-processor, one end of the post-processor is connected to an explosion-proof water tank, the explosion-proof water tank is connected to a water supply tank through a pipeline, a temperature sensor is installed on the explosion-proof water tank, and an exhaust cooling unit is provided on the explosion-proof water tank.

[0006] Preferably, the exhaust gas cooling unit comprises two temperature control valves and two nozzles, the two temperature control valves are installed on one side of the explosion-proof water tank, and the nozzle is installed on the side of the explosion-proof water tank away from the temperature control valves.

[0007] Preferably, a tail gas inlet is provided at one left end of the explosion-proof water tank, and a tail gas outlet is provided at the other right end of the explosion-proof water tank.

[0008] Preferably, a filter is provided between the water supply tank and the explosion-proof water tank, one end of the filter is connected to one end of the water supply tank through a pipe, and the other end of the filter is connected to one end of the explosion-proof water tank through a pipe.

[0009] Preferably, one end of the filter is connected to one of the temperature control valves through a pipeline, and one end of the air compressor is connected to the other temperature control valve through a pipeline.

[0010] Preferably, one of the temperature control valves is connected to the nozzle via a pipeline, and the other temperature control valve is connected to the nozzle via a pipeline.

[0011] Preferably, a pressure relief valve is provided between the air compressor and the two temperature control valves.

[0012] Preferably, one end of the post-processor is connected to the exhaust gas inlet.

[0013] Compared with the prior art, the present invention adopts the above technical scheme and has the following technical effects: compared with the wet cooling method, the present invention has low exhaust back pressure of the diesel engine, reduces the energy loss of the diesel engine, saves cooling water and prevents backwater, avoids water ingress into the diesel engine aftertreatment system and cylinder, and avoids major failures; and compared with the dry cooling method, the cooling system has a small volume, a simple system structure, and will not cause the coolant effect to deteriorate due to carbon deposition inside, and has a simple structure and is easy to clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic diagram of a diesel engine system of the present invention;

[0016] Figure 2 It is a schematic diagram of the exhaust gas cooling system of the present invention;

[0017] Figure 3 It is a schematic diagram of the tail gas cooling unit principle of the present invention.

[0018] Explanation of the reference numerals in the accompanying drawings: 1. Air filter; 2. Compressor; 3. Intercooler; 4. Air compressor; 5. Turbine; 6. Post-processor; 7. Water supply tank; 8. Explosion-proof water tank; 9. Temperature sensor; 10. Exhaust gas inlet; 11. Exhaust gas outlet; 12. Temperature control valve; 13. Nozzle; 14. Filter; 15. Pressure relief valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0021] Example

[0022] See also Figure 1-3 The present invention provides a technical solution: an explosion-proof diesel engine exhaust cooling system, comprising an air filter 1, the air filter 1 is connected to a compressor 2, one end of the compressor 2 is connected to an intercooler 3, one end of the intercooler 3 is connected to an air compressor 4, the air compressor 4 is respectively connected to a turbine 5 and an explosion-proof water tank 8, one end of the turbine 5 is connected to a post-processor 6, one end of the post-processor 6 is connected to the explosion-proof water tank 8, the explosion-proof water tank 8 is connected to a water supply tank 7 through a pipeline, a temperature sensor 9 is installed on the explosion-proof water tank 8, and an exhaust gas Cooling unit; the air filtered by the air filter 1 enters the interior of the compressor 2, the compressor 2 can increase the pressure of the air, the pressurized air enters the interior of the intercooler 3, the intercooler 3 can reduce the temperature of the air, and then the air enters the interior of the air compressor 4, the air compressor 4 can compress the air so that the fuel can be fully burned, the compressed air enters the interior of the turbine 5, the turbine 5 can convert the energy of the high-temperature and high-pressure fuel gas into mechanical work, drive the engine to work, and then the exhaust gas is processed by the post-processor 6.

[0023] By setting up an exhaust gas cooling unit, the exhaust gas temperature can be reduced; the exhaust gas cooling unit includes two temperature control valves 12 and a nozzle 13, the two temperature control valves 12 are installed on one side of the explosion-proof water tank 8, and the nozzle 13 is installed on the side of the explosion-proof water tank 8 away from the temperature control valve 12. The exhaust gas enters the interior of the explosion-proof water tank 8 through the exhaust gas inlet 10, and the temperature of the explosion-proof water tank 8 is detected by the temperature sensor 9. The temperature control valves 12 of the water circuit and the gas circuit start to open at a temperature of 60°C and are fully opened at 70°C. At the same time, the air pressure after being compressed by the air compressor 4 is 0.2-0.8MPa, and the compressed air enters through the air inlet of the nozzle 13. The compressed air generates a high-speed airflow at the outlet of the nozzle 13, and the high-speed airflow causes the air pressure at the outlet of the nozzle 13 to decrease;

[0024] A filter 14 is provided between the water supply tank 7 and the explosion-proof water tank 8. One end of the filter 14 is connected to one end of the water supply tank 7 through a pipe, and the other end of the filter 14 is connected to one end of the explosion-proof water tank 8 through a pipe. One end of the filter 14 is connected to one of the temperature control valves 12 through a pipe, and one end of the air compressor 4 is connected to another temperature control valve 12 through a pipe. One of the temperature control valves 12 is connected to the nozzle 13 through a pipe, and the other temperature control valve 12 is connected to the nozzle 13 through a pipe. Water is sucked from the water supply tank 7 through the filter 14 to the water inlet of the nozzle 13, and sprayed from the outlet of the nozzle 13 to form a spray with a conical shape. The spray direction is opposite to the airflow direction to form convection, and the spray is quickly mixed with the high-temperature exhaust gas to reduce the exhaust temperature.

[0025] like Figure 3 As shown, two temperature control valves 12 and a nozzle 13 are combined into an exhaust gas cooling unit. The required amount of spray water is calculated according to the maximum temperature of the exhaust gas entering the explosion-proof water tank 8 and the maximum exhaust mass flow rate, so as to determine how many levels of spray cooling units are needed. Through the control of the temperature control valve 12, the number of opened nozzles 13 is automatically adjusted under different working conditions, so as to prevent the waste of cooling water. Through a mechanical temperature control valve or a solenoid valve, the water circuit and the air circuit are controlled to be on and off according to the exhaust temperature, so as to achieve the purpose of saving water and energy. The atomizing nozzle adopts the siphon principle, using high-speed compressed air to form a low-pressure area at the nozzle mouth to suck out the water and atomize it. The compressed air pressure is 0.2-0.8MPa, and the water does not need pressure.

[0026] An exhaust gas inlet 10 is provided at one end of the left side of the explosion-proof water tank 8, and one end of the post-processor 6 is connected to the exhaust gas inlet 10. The exhaust gas treated by the post-processor 6 enters the interior of the explosion-proof water tank 8 through the exhaust gas inlet 10. An exhaust gas outlet 11 is provided at the other end of the right side of the explosion-proof water tank 8, and the cooled exhaust gas is discharged from the interior of the explosion-proof water tank 8 through the exhaust gas outlet 11.

[0027] A pressure relief valve 15 is provided between the air compressor 4 and the two temperature control valves 12. The outlet pipeline of the air compressor 4 is provided with a pressure relief valve 15 to discharge excess air.

[0028] Working principle or structural principle, the air filtered by the air filter 1 enters the interior of the compressor 2, the compressor 2 can increase the pressure of the air, the pressurized air enters the interior of the intercooler 3, the intercooler 3 can reduce the temperature of the air, and then the air enters the interior of the air compressor 4, the air compressor 4 can compress the air so that the fuel can be fully burned, the compressed air enters the interior of the turbine 5, the turbine 5 can convert the energy of the high-temperature and high-pressure fuel gas into mechanical work, drive the engine to work, and then the exhaust gas is processed by the post-processor 6;

[0029] The exhaust gas enters the interior of the explosion-proof water tank 8 through the tail gas inlet 10, and the temperature of the explosion-proof water tank 8 is detected by the temperature sensor 9. The temperature control valve 12 of the water circuit and the gas circuit begins to open at a temperature of 60°C and is fully opened at 70°C. At the same time, the air pressure after being compressed by the air compressor 4 is 0.2-0.8MPa. The compressed air enters through the air inlet of the nozzle 13, and the compressed air generates a high-speed airflow at the outlet of the nozzle 13. The high-speed airflow causes the air pressure at the outlet of the nozzle 13 to decrease, and the water is sucked from the water supply tank 7 and then through the filter 14 to the water inlet of the nozzle 13, and sprayed from the outlet of the nozzle 13 to form a spray, and the spray shape is conical. The spray direction is opposite to the air flow direction, forming convection, and the spray is quickly mixed with the high-temperature exhaust gas to reduce the exhaust temperature. A pressure relief valve 15 is installed on the outlet pipeline of the air compressor 4 to remove excess air.

[0030] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

Claims

1. An explosion-proof diesel engine exhaust cooling system, comprising an air filter (1), characterized in that: The air filter (1) is connected to a compressor (2), one end of the compressor (2) is connected to an intercooler (3), one end of the intercooler (3) is connected to an air compressor (4), the air compressor (4) is respectively connected to a turbine (5) and an explosion-proof water tank (8), one end of the turbine (5) is connected to a post-processor (6), one end of the post-processor (6) is connected to the explosion-proof water tank (8), the explosion-proof water tank (8) is connected to a water supply tank (7) via a pipeline, a temperature sensor (9) is installed on the explosion-proof water tank (8), and an exhaust gas cooling unit is provided on the explosion-proof water tank (8).

2. The explosion-proof diesel engine exhaust cooling system according to claim 1, characterized in that: The exhaust gas cooling unit comprises two temperature control valves (12) and a nozzle (13), wherein the two temperature control valves (12) are installed on one side of the explosion-proof water tank (8), and the nozzle (13) is installed on a side of the explosion-proof water tank (8) away from the temperature control valve (12).

3. The explosion-proof diesel engine exhaust cooling system according to claim 1, characterized in that: A tail gas inlet (10) is provided at one left end of the explosion-proof water tank (8), and a tail gas outlet (11) is provided at the other right end of the explosion-proof water tank (8).

4. The explosion-proof diesel engine exhaust cooling system according to claim 2, characterized in that: A filter (14) is provided between the water supply tank (7) and the explosion-proof water tank (8); one end of the filter (14) is connected to one end of the water supply tank (7) through a pipeline, and the other end of the filter (14) is connected to one end of the explosion-proof water tank (8) through a pipeline.

5. The explosion-proof diesel engine exhaust cooling system according to claim 4, characterized in that: One end of the filter (14) is connected to one of the temperature control valves (12) through a pipeline, and one end of the air compressor (4) is connected to the other temperature control valve (12) through a pipeline.

6. The explosion-proof diesel engine exhaust cooling system according to claim 2, characterized in that: One of the temperature control valves (12) is connected to the nozzle (13) via a pipeline, and the other temperature control valve (12) is connected to the nozzle (13) via a pipeline.

7. The explosion-proof diesel engine exhaust cooling system according to claim 2, characterized in that: A pressure relief valve (15) is provided between the air compressor (4) and the two temperature control valves (12).

8. The explosion-proof diesel engine exhaust cooling system according to claim 3, characterized in that: One end of the post-processor (6) is connected to the exhaust gas inlet (10).

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