Engine tail gas self-purification device and method

Abstract

The invention relates to the technical field of engine tail gas treatment, and particularly discloses an engine tail gas self-purification device which comprises an ozone generator, a temperature difference power generation piece and an inverter, the hot end of the temperature difference power generation piece is connected to an engine tail gas outlet through a heat conduction pipe, and the cold end of the temperature difference power generation piece is connected to the environment meeting the needed temperature difference. The hot end electrode and the cold end electrode are connected to an input terminal of the inverter through wires, an output terminal of the inverter is connected with an alternating current input end of the ozone generator through a wire, and the input end inputs high-voltage high-frequency alternating current for the ozone generator to generate ozone through a corona discharge method. And the generated ozone is controlled by a throttling device to be input to the air inlet end of the engine. The device can improve the operation efficiency of the engine, reduce the emission of harmful gas, and realize the sustainable tail gas purification for the mobile transportation tool without external energy.

Description

Technical Field

[0001] The invention relates to the technical field of engine exhaust treatment, and in particular to an engine exhaust self-purification device and method. Background Art

[0002] As people's living standards and economic levels improve, the requirements for the speed and efficiency of goods transportation are getting higher and higher, and various types of mobile transportation tools are being developed and applied. However, the exhaust pollution generated by mobile powered transportation tools is a very serious environmental problem we face.

[0003] At present, there are two main types of exhaust gas purification systems: internal purification and external purification. Internal purification improves exhaust emissions by transforming the engine structure. However, internal purification technology has strict requirements on equipment, high costs, and unsatisfactory purification effects, making it difficult to meet increasingly stringent emission standards.

[0004] Off-engine purification refers to installing a purification device on the exhaust pipe to convert harmful substances in the exhaust gas into harmless or low-harm substances through oxidation catalytic technology. The current mainstream off-engine purification technology is the three-way catalytic converter technology. The disadvantage of this exhaust treatment technology is that it has relatively stringent requirements, such as using unleaded gasoline and accurately controlling the air-fuel ratio, sacrificing fuel economy. In addition, the three-way catalytic converter technology catalyst has high cost of precious metals, short life, poor anti-seismic performance, narrow operating range, and high requirements for catalyst manufacturing technology.

[0005] The above two types of exhaust purification technologies cannot effectively treat diesel exhaust particulate matter. The international treatment technology for diesel exhaust particulate matter is mainly diesel particulate aftertreatment technology DFE, which works by filtering out particulates through ceramic honeycomb carriers. However, DFE has regeneration and deactivation problems, which directly affect the power performance and fuel economy of motor vehicles.

[0006] Existing tail gas treatment methods all have disadvantages to varying degrees and cannot meet the increasingly stringent environmental protection requirements. Therefore, there is an urgent need for a new tail gas treatment technology with low cost, good applicability, good purification effect and good sustainability.

[0007] At present, there is no precedent in China for combining thermoelectric power generation sheets with high-voltage electricity ozone production equipment for use in mobile transportation vehicle exhaust purification. Summary of the invention

[0008] The purpose of the present invention is to provide a new exhaust gas treatment device for front-mounted mobile power-type transportation vehicles, which combines the temperature difference power generation technology based on the Seebeck effect with a high-voltage electricity ozone production device, and introduces air containing ozone into the engine air intake to improve the engine operating efficiency, reduce harmful gas emissions, and achieve sustainable exhaust gas purification for mobile transportation vehicles without the need for external energy.

[0009] The purpose of the present invention can be achieved through the following technical solutions:

[0010] An engine exhaust self-purification device comprises an ozone generator, a temperature difference power generation sheet and an inverter, wherein the hot end of the temperature difference power generation sheet is connected to the engine exhaust outlet through a heat conduction pipe, and the cold end is connected to an environment that meets the required temperature difference, the hot end electrode and the cold end electrode are connected to the input terminal of the inverter through a wire, and the output terminal of the inverter is connected to the alternating current input terminal of the ozone generator through a wire, and the input terminal inputs high-voltage and high-frequency alternating current for the ozone generator to generate ozone by corona discharge method, and the generated ozone is controlled to be input to the engine intake end through a throttling device.

[0011] In a further solution, the environment satisfying the required temperature difference includes an engine natural air intake environment or an air conditioning refrigeration environment.

[0012] In a further scheme, the ozone generator includes a stainless steel layer, an enamel dielectric layer and a carbon steel layer arranged in sequence, a corona zone for oxygen corona is arranged between the stainless steel layer and the enamel dielectric layer, the stainless steel layer is grounded, the carbon steel layer is connected to the high-voltage and high-frequency alternating current output by the inverter, and the stainless steel layer and the enamel dielectric layer are connected by a connecting block.

[0013] In a further embodiment, the cross-sections of the stainless steel layer, the enamel dielectric layer and the carbon steel layer are in the shape of circular tubes.

[0014] In a further solution, a plurality of the thermoelectric power generation sheets are evenly spaced and arranged on the tube body, the interior of the tube body is used for exhaust gas to pass through, and the p-pole and n-pole of each thermoelectric power generation sheet are connected by a metal conductor to form positive and negative electrodes.

[0015] In a further solution, the heat conduction direction of the thermoelectric power generation sheet is from inside the tube to outside the tube.

[0016] In a further embodiment, the throttling device includes a throttle valve.

[0017] On the other hand, the present invention also provides an engine exhaust self-purification method, using the above-mentioned engine exhaust self-purification device.

[0018] In a further embodiment, the temperature difference of the thermoelectric power generation sheet is maintained within a range of 60°C to 400°C.

[0019] In a further solution, the electric energy generated by the thermoelectric generator is stored in a power supply and rectified by an inverter circuit to form a sinusoidal high-frequency alternating current.

[0020] Beneficial effects of the present invention:

[0021] The present invention can achieve sustainable exhaust gas purification without the need for external energy through structures such as an ozone generator, a temperature difference power generation sheet and an inverter, thereby improving the engine exhaust gas purification effect and reducing the purification cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the principle of an engine exhaust self-purification device in an embodiment of the present invention;

[0024] Figure 2 is a connection diagram of an ozone generator in an embodiment of the present invention;

[0025] Figure 3 This is the original connection diagram of the temperature difference power generation sheet in the embodiment of the present invention;

[0026] Figure 4 Schematic diagram of temperature conduction of a thermoelectric power generation sheet in an embodiment of the present invention;

[0027] In the figure: 1. Thermoelectric generator; 11. Metal conductor; 12. Hot end electrode; 13. Cold end electrode; 2. Inverter; 3. Ozone generator; 31. Stainless steel layer; 32. Enamel dielectric layer; 33. Carbon steel layer; 34. Corona zone; 35. Connecting block; 4. Engine. DETAILED DESCRIPTION

[0028] 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.

[0029] An engine exhaust self-purification device comprises an ozone generator 3, a temperature difference power generation sheet 1 and an inverter 2, wherein the hot end of the temperature difference power generation sheet 1 is connected to the exhaust outlet of an engine 4 through a heat conduction pipe, and the cold end is connected to an environment that satisfies the required temperature difference, the hot end electrode 12 and the cold end electrode 13 are connected to the input terminal of the inverter 2 through a wire, and the output terminal of the inverter 2 is connected to the alternating current input terminal of the ozone generator 3 through a wire, and the input terminal inputs high-voltage and high-frequency alternating current for the ozone generator 3 to generate ozone by corona discharge method, and the generated ozone is input to the intake end of the engine 4 through a throttling device.

[0030] Its working principle is to integrate the Seebeck effect of thermoelectric power generation technology, inverter boost technology, and high-voltage electricity ozone production technology, generate electricity through the temperature difference between exhaust gas and the environment, and achieve sustainable exhaust gas purification without external energy. Specifically, the thermoelectric power generation sheet 1 converts the thermal energy of exhaust gas into electrical energy, and the generated electrical energy is converted into high-voltage and high-frequency alternating current through the inverter boost circuit of the inverter 2 to drive the ozone generator 3 to convert oxygen into the allotrope of oxygen O2, ozone O3. Ozone has a strong oxidizing property, which can improve the combustion efficiency of fuel and reduce the emission of harmful gases in exhaust gas. At the same time, ozone can also release energy when it is decomposed at high temperature. Therefore, by controlling the ozone content introduced through the throttling device, the oxidation and combustion of waste gas in the exhaust gas can be accelerated to a certain extent.

[0031] According to the above working principle, a preferred implementation structure or method is provided, wherein the environment that meets the required temperature difference includes the natural air intake environment of the engine 4 or the air conditioning refrigeration environment. This can increase the power generation efficiency and improve the utilization rate of exhaust gas heat energy.

[0032] like Figure 2 As shown, the ozone generator 3 includes a stainless steel layer 31, an enamel dielectric layer 32 and a carbon steel layer 33 which are arranged in sequence, a corona zone 34 for oxygen corona is arranged between the stainless steel layer 31 and the enamel dielectric layer 32, the stainless steel layer 31 is grounded, the carbon steel layer is connected to the high-voltage and high-frequency alternating current output by the inverter 2, and the stainless steel layer 31 and the enamel dielectric layer 32 are connected by a connecting block 35. This can facilitate the entry of oxygen and the collection of ozone, and at the same time facilitate the connection of the ozone generator 3 with the pipeline of the throttling device, and then with the intake pipeline of the engine 4. The material of the connecting block 35 can be selected from high-temperature resistant polytetrafluoroethylene material.

[0033] The cross-sections of the stainless steel layer 31, the enamel dielectric layer 32 and the carbon steel layer 33 are in the shape of a circular tube, which facilitates threaded connection.

[0034] like Figure 3 As shown, a plurality of the thermoelectric power generation sheets 1 are evenly spaced and arranged on the tube body 10, the interior of the tube body 10 is used for exhaust gas to pass through, and the p-pole and n-pole of each thermoelectric power generation sheet 1 are connected to form positive and negative electrodes through a metal conductor 11. This facilitates connection with the exhaust pipe of the engine 4, and the metal conductor 11 facilitates the installation of the p-pole and n-pole of each thermoelectric power generation sheet 1.

[0035] like Figure 4 As shown, the heat conduction direction of the thermoelectric power generation sheet 1 is from inside the tube to outside the tube, which facilitates heat transfer in the exhaust gas.

[0036] The throttle device comprises a throttle valve. The throttle valve is a common throttle tool, which is easy to obtain and install on the engine 4.

[0037] The temperature difference of the thermoelectric power generation sheet 1 is maintained within a range of 60°C to 400°C. Figure 4 As shown, the direction indicated by the arrow is the temperature transfer direction. This temperature difference range is suitable for the exhaust temperature of the engine 4, and the power generation effect is good, especially in the range of 90°C to 300°C, a higher power output can be obtained. Those skilled in the art should be able to think that in order to achieve the most suitable temperature difference range of the thermoelectric power generation sheet, it can be achieved through multi-layer cooling, such as stacking the thermoelectric power generation sheet in multiple layers, and controlling the input gas temperature between each layer to achieve temperature difference control, or it can be achieved through the cooling device provided at the exhaust at the tail of the engine, which will not be described in detail.

[0038] The electric energy generated by the thermoelectric power generation sheet 1 is stored in the power supply and rectified by the inverter circuit to form a sinusoidal high-frequency alternating current.

[0039] When used specifically, Figure 1 As shown, 1 is a temperature difference power generation sheet 1, which converts the heat energy of exhaust gas into electrical energy; 2 is an inverter device, which converts low-voltage DC electricity into high-frequency high-voltage electricity; 3 is an ozone generator 3 single-tube enamel dielectric ozone generator 3, which converts oxygen into ozone through a corona method; 4 is a mobile power transport vehicle engine 4, which improves fuel combustion efficiency and reduces the emission of harmful gases in exhaust gas by introducing part of ozone at the inlet of the engine 4.

[0040] There are a certain number of carriers such as electrons or holes, such as bismuth telluride, inside the semiconductor of the thermoelectric power generation sheet 1. The density of these carriers will change with the change of temperature. If the temperature at one end of the object is high and the temperature at the other end is low, different carrier densities will appear in the middle of the same object. As long as the temperature difference between the two ends of the object can be maintained, the carriers can continue to diffuse, thereby forming a stable voltage. Therefore, when the exhaust temperature of the engine 4 circulates through the cooling device and reaches the appropriate input temperature of the power generation sheet, the power generation sheet will use the ambient temperature difference to form an electric energy supply. The operation of the entire purification device is controlled by the control circuit of the inverter 2. The inverter circuit completes the function of converting direct current into alternating current, and the filter circuit is used to filter out unnecessary signals.

[0041] The operation of the inverter circuit can be further broken down into the following: first, the oscillation circuit converts direct current into alternating current; second, the coil boost converts irregular alternating current into square wave alternating current; finally, rectification converts alternating current into sinusoidal alternating current via square wave.

[0042] Take the 2021 2.5L Navara manual two-wheel drive premium QR25 in operation of a certain oil unit as an example:

[0043] This model runs 16,000 kilometers throughout the year, with an average fuel consumption of 12.5 liters per 100 kilometers. The calorific value of 92# gasoline is 33580KJ / L. The density of 92# gasoline is 0.72-0.74g / ml, and 0.73g / ml is taken as a compromise. When each kg of gasoline burns, it releases about 46000KJ of heat. Therefore, burning one liter of gasoline releases 0.73*46000=33580KJ=8022 kcal. The energy conversion rate of the engine 4 is about 35%, and the remaining 65% of the energy is mainly discharged to the environment in the form of heat energy. The energy conversion efficiency of the thermoelectric generator 1 is 3%-10%.

[0044] The calorific value of exhaust gas generated by the vehicle in one year is:

[0045] 1.6*104*12.5÷100*33580*65%=4365.4*104KJ

[0046] Calculated based on the energy conversion rate of the thermoelectric power generation sheet 1 being 5%, the electrical energy that can be generated is 1KJ=0.0002778KW·h:

[0047] 4365.4*104*5%=218.27*104KJ=606.35KW·h. Based on the calculation that 90W·h of electricity is required for every 20g of ozone produced by high-voltage electric ozone, 606.35*1000÷90*20=134744.4g≈134.7Kg of ozone can be produced.

[0048] It should be noted that the terms "first", "second" etc. in the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the orientation or positional relationship shown in the accompanying drawings.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An engine exhaust self-purification device, characterized in that: The invention comprises an ozone generator (3), a temperature difference power generation sheet (1) and an inverter (2); the hot end of the temperature difference power generation sheet (1) is connected to the exhaust outlet of an engine (4) through a heat conduction pipe, and the cold end is connected to an environment that satisfies the required temperature difference; the hot end electrode (12) and the cold end electrode (13) are connected to the input terminal of the inverter (2) through a wire; the output terminal of the inverter (2) is connected to the alternating current input terminal of the ozone generator (3) through a wire; the input terminal inputs high-voltage and high-frequency alternating current for the ozone generator (3) to generate ozone by a corona discharge method; the generated ozone is input to the intake end of the engine (4) through a throttling device.

2. The engine exhaust self-purification device according to claim 1, characterized in that: The environment satisfying the required temperature difference includes the natural air intake environment of the engine (4) or the air conditioning refrigeration environment.

3. The engine exhaust self-purification device according to claim 1, characterized in that: The ozone generator (3) comprises a stainless steel layer (31), an enamel dielectric layer (32) and a carbon steel layer (33) which are arranged in sequence; a corona zone (34) for oxygen corona is arranged between the stainless steel layer (31) and the enamel dielectric layer (32); the stainless steel layer (31) is grounded; the carbon steel layer is connected to the high-voltage and high-frequency alternating current output by the inverter (2); and the stainless steel layer (31) and the enamel dielectric layer (32) are connected via a connecting block (35).

4. The engine exhaust self-purification device according to claim 3, characterized in that: The cross sections of the stainless steel layer (31), the enamel dielectric layer (32) and the carbon steel layer (33) are in the shape of circular tubes.

5. The engine exhaust self-purification device according to claim 1, characterized in that: A plurality of the thermoelectric power generation sheets (1) are evenly spaced and arranged on a tube body (10); the interior of the tube body (10) is used for exhaust gas to pass through; and the p-pole and n-pole of each thermoelectric power generation sheet (1) are connected via a metal conductor (11) to form positive and negative electrodes.

6. The engine exhaust self-purification device according to claim 5, characterized in that: The heat conduction direction of the temperature difference power generation sheet (1) is from inside the tube to outside the tube.

7. The engine exhaust self-purification device according to claim 1, characterized in that: The throttling device comprises a throttle valve.

8. A method for self-purification of engine exhaust, characterized in that: Use the engine exhaust self-purification device described in any one of claims 1-7.

9. The engine exhaust self-purification method according to claim 8, characterized in that: The temperature difference of the thermoelectric power generation sheet (1) is maintained within a range of 60°C to 400°C.

10. The engine exhaust self-purification method according to claim 9, characterized in that: The electric energy generated by the temperature difference power generation sheet (1) is stored in a power source and rectified by an inverter circuit to form a sinusoidal high-frequency alternating current.

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