Energy-saving and emission-reducing device suitable for diesel engine

Abstract

The utility model provides an energy conservation and emission reduction device suitable for a diesel engine, which belongs to the technical field of energy conservation and emission reduction, and comprises a tail gas pipe, a heat energy recovery mechanism, a heat energy recovery mechanism, a heat energy recovery mechanism, a heat energy recovery mechanism, a heat energy recovery mechanism and a heat energy recovery mechanism, wherein one end of the tail gas pipe is fixedly connected with an oxidation catalytic converter, and one end of the oxidation catalytic converter is fixedly connected with a particulate filter through a connecting pipe; the heat energy recovery mechanism is fixedly connected with the particle trap through a connecting pipe, and one end of the heat energy recovery mechanism is fixedly connected with a catalytic reduction pipe mechanism through a connecting pipe. Through the arrangement of the heat energy recovery mechanism, heat energy in high-temperature waste gas is transferred to the exchange medium, and the heat energy is recycled through the circulating pipe, so that the heat energy recovery mode not only reduces energy waste, but also provides a heat source for preheating of a urea solution, and further improves the energy utilization efficiency of the whole system; the urea solution is heated by the electric heater at the top of the urea box and is prevented from being crystallized or solidified at low temperature.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy conservation and emission reduction, and particularly relates to an energy conservation and emission reduction device suitable for a diesel engine. Background Art

[0002] As global environmental issues become increasingly prominent, governments around the world have introduced stringent environmental regulations and imposed strict restrictions on diesel engine emissions. Diesel engine energy-saving and emission-reduction devices are a collection of technical equipment designed to reduce diesel engine pollutant emissions and improve energy efficiency. These devices achieve the goal of energy conservation and emission reduction by optimizing the combustion process, improving the emission treatment system, and recycling and utilizing the heat energy in the exhaust gas.

[0003] Currently available energy-saving and emission-reduction devices for diesel engines often ignore the recovery and utilization of heat energy in high-temperature exhaust gases, resulting in a large amount of heat energy being directly discharged into the atmosphere. This not only causes a huge waste of energy but also increases the environmental heat load. In addition, in low-temperature environments, the urea solution in existing devices is prone to crystallization or solidification, which not only affects the normal injection of the urea nozzle but may also significantly reduce the efficiency of the SCR reaction. Due to the lack of effective urea solution heating measures, the operating performance of the device in cold seasons or low-temperature environments is greatly reduced, and it cannot meet strict emission standards. Utility Model Content

[0004] The purpose of the present invention is to provide an energy-saving and emission-reduction device suitable for a diesel engine, aiming to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An energy-saving and emission-reduction device for a diesel engine, comprising an exhaust pipe, one end of which is fixedly connected to an oxidation catalyst, one end of which is fixedly connected to a particulate trap via a connecting pipe, and further comprising:

[0007] A heat recovery mechanism is fixedly connected to the particulate collector via a connecting pipe, one end of the heat recovery mechanism is fixedly connected to a catalytic reduction tube mechanism via the connecting pipe, and one end of the catalytic reduction tube mechanism is fixedly connected to an exhaust pipe.

[0008] As a preferred solution of the present invention, the heat energy recovery mechanism includes a heat exchange box fixedly connected to the particle collector, an extraction pump fixedly connected to one side of the heat exchange box, an exchange medium and a heat exchange plate are provided inside the heat exchange box, and a circulation pipe is fixedly connected to one end of the extraction pump.

[0009] As a preferred solution of the present invention, the catalytic reduction tube mechanism includes a catalytic tube fixedly connected to the heat exchange box through a connecting tube, a urea nozzle is provided inside the catalytic tube, the top of the urea nozzle extends to the outside of the catalytic tube and is fixedly connected to a urea pipeline.

[0010] As a preferred solution of the present invention, one end of the urea pipeline is fixedly connected to a urea pump, and the end of the urea pump is fixedly connected to a urea tank.

[0011] As a preferred solution of the present invention, an electric heater is provided on the top of the urea tank, and an electric heating pipe at the end of the electric heater extends into the interior of the urea tank.

[0012] As a preferred solution of the present invention, the circulation pipe passes through the urea tank and is fixedly connected to the other side of the heat exchange tank.

[0013] As a preferred solution of the present invention, the bottoms of the oxidation catalyst, the particulate trap, the heat exchange box and the urea tank are all fixedly connected to a bracket, and one side of the bracket is fixedly connected to a fixed beam.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This energy-saving and emission-reduction device for diesel engines transfers heat energy from high-temperature exhaust gas to an exchange medium through the setting of a heat recovery mechanism, and realizes heat energy recovery and utilization through a circulation pipe. This heat energy recovery method not only reduces energy waste, but also provides a heat source for preheating the urea solution, further improving the energy utilization efficiency of the entire system.

[0016] 2. This energy-saving and emission-reduction device for diesel engines heats the urea solution through an electric heater on top of the urea tank to prevent it from crystallizing or solidifying at low temperatures, ensuring the fluidity of the urea solution and enabling the urea nozzle to spray the urea solution evenly and fully, thereby improving the efficiency of the SCR reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a rear view of the overall structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the local structure of the utility model;

[0021] Figure 4 This is a cross-sectional view of the heat exchange box structure of the present utility model;

[0022] Figure 5 This is a schematic diagram of the catalytic reduction tube structure of the utility model.

[0023] In the figure: 1. exhaust pipe; 2. oxidation catalyst; 3. particulate filter; 4. heat recovery mechanism; 401. heat exchanger box; 402. extraction pump; 403. heat exchanger plate; 404. circulation pipe; 5. catalytic reduction pipe mechanism; 501. catalytic tube; 502. urea nozzle; 503. urea pipeline; 504. urea pump; 505. urea tank; 6. exhaust pipe; 7. electric heater; 8. bracket; 9. fixed beam. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it designate a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example

[0028] Refer to the figure Figure 1-5 , which is the first embodiment of the present utility model, provides an energy-saving and emission-reduction device for a diesel engine, comprising an exhaust pipe 1, one end of which is fixedly connected to an oxidation catalyst 2, and one end of the oxidation catalyst 2 is fixedly connected to a particulate trap 3 via a connecting pipe, and further comprising:

[0029] The heat energy recovery mechanism 4 is fixedly connected to the particulate collector 3 through a connecting pipe. One end of the heat energy recovery mechanism 4 is fixedly connected to the catalytic reduction tube mechanism 5 through the connecting pipe. One end of the catalytic reduction tube mechanism 5 is fixedly connected to the exhaust pipe 6.

[0030] Specifically, the heat energy recovery mechanism 4 includes a heat exchange box 401 fixedly connected to the particulate collector 3, an extraction pump 402 is fixedly connected to one side of the heat exchange box 401, an exchange medium and a heat exchange plate 403 are provided inside the heat exchange box 401, and a circulation pipe 404 is fixedly connected to one end of the extraction pump 402.

[0031] Furthermore: the tailpipe 1 is a major component of the diesel engine exhaust system and is responsible for directing the exhaust gas generated after combustion to subsequent treatment devices. The oxidation catalyst 2 uses a catalyst to promote the oxidation reaction of harmful substances such as carbon monoxide and hydrocarbons in the exhaust gas with oxygen in the air, converting them into carbon dioxide and water, reducing harmful emissions in the exhaust gas, improving emission quality, and creating conditions for subsequent particulate capture and heat energy recovery. The particulate filter 3 can effectively remove particulate matter in the exhaust gas and reduce PM emissions. The heat energy recovery mechanism 4 realizes the recovery and utilization of heat energy in the high-temperature exhaust gas. The heat exchange box 401 uses the heat energy in the exhaust gas to heat the exchange medium through the heat exchange principle to achieve heat energy recovery. The extraction pump 402 provides power for the fluid in the circulation pipe 404 to ensure the smooth progress of the heat energy recovery process. The heat exchange plate 403 increases the heat exchange efficiency by increasing the heat exchange area, accelerating the heat transfer between the exhaust gas and the exchange medium. The circulation pipe 404 provides a circulation channel for the fluid, transporting the heated exchange medium to the urea tank 505 and returning it to the heat exchange box 401 for reheating.

[0032] Specifically, the catalytic reduction tube mechanism 5 includes a catalytic tube 501 fixedly connected to the heat exchange box 401 through a connecting tube, a urea nozzle 502 is provided inside the catalytic tube 501, the top of the urea nozzle 502 extends to the outside of the catalytic tube 501 and is fixedly connected to a urea pipeline 503, one end of the urea pipeline 503 is fixedly connected to a urea pump 504, the end of the urea pump 504 is fixedly connected to a urea tank 505, an electric heater 7 is provided on the top of the urea tank 505, and the electric heating pipe at the end of the electric heater 7 extends to the interior of the urea tank 505, the circulation pipe 404 passes through the urea tank 505 and is fixedly connected to the other side of the heat exchange box 401.

[0033] Furthermore, the catalytic tube 501 promotes a chemical reaction between urea and nitrogen oxides in the exhaust gas. The urea solution is sprayed into the catalytic tube 501 to react with the nitrogen oxides in the high-temperature exhaust gas to generate harmless nitrogen and water vapor. The urea nozzle 502 atomizes the urea solution and sprays it into the catalytic tube 501 to ensure that the urea solution can be evenly and fully mixed with the exhaust gas. The urea solution is transported from the urea tank 505 to the urea nozzle 502 through the urea pipeline 503 and the urea pump 504. The electric heater 7 uses electrical energy to generate heat to heat the urea solution in the urea tank 505 to prevent the urea solution from crystallizing or solidifying at low temperatures, thereby ensuring the fluidity of the urea solution.

[0034] Specifically, the bottoms of the oxidation catalyst 2 , the particulate trap 3 , the heat exchange box 401 and the urea tank 505 are all fixedly connected to a bracket 8 , and one side of the bracket 8 is fixedly connected to a fixing beam 9 .

[0035] Furthermore, by providing the bracket 8 and the fixing beam 9, not only can the oxidation catalyst 2, the particulate filter 3, the heat exchanger box 401 and the urea tank 505 be fixed, but the weight of these components can also be effectively dispersed and borne, preventing them from being damaged or displaced due to excessive weight or vibration.

[0036] Working principle:

[0037] During use, the exhaust gas generated after the combustion of the diesel engine is first guided to the oxidation catalyst 2 through the tailpipe 1. In the oxidation catalyst 2, harmful substances such as carbon monoxide and hydrocarbons in the exhaust gas undergo oxidation reaction with oxygen in the air under the action of the catalyst and are converted into carbon dioxide and water, thereby reducing harmful emissions. The exhaust gas after preliminary purification then enters the particulate filter 3. The particulate filter 3 captures particulate matter in the exhaust gas and reduces PM emissions. After the exhaust gas passes through the particulate filter 3, its temperature is still relatively high. At this time, it enters the heat exchange box 401 of the heat energy recovery mechanism 4. In the heat exchange box 401, the exhaust gas and the exchange medium exchange heat through the heat exchange plate 403, and the heat energy in the exhaust gas is transferred to the exchange medium. The extraction pump 402 The fluid in the circulation pipe 404 is powered to circulate the exchange medium between the heat exchanger box 401 and the urea tank 505, thereby recycling heat energy. The heated exchange medium enters the urea tank 505 through the circulation pipe 404 to preheat the urea solution to prevent it from crystallizing or solidifying at low temperatures. The urea pump 504 transports the urea solution from the urea tank 505 through the urea pipeline 503 to the urea nozzle 502 in the catalytic tube 501. The urea nozzle 502 atomizes the urea solution and sprays it into the catalytic tube 501. The urea solution reacts chemically with the nitrogen oxides in the high-temperature exhaust gas under the action of the catalyst to generate harmless nitrogen and water vapor, thereby reducing the emission of nitrogen oxides. The treated exhaust gas is finally discharged into the atmosphere through the exhaust pipe 6.

[0038] In summary, the heat recovery mechanism 4 transfers the heat energy in the high-temperature exhaust gas to the exchange medium through the heat exchange process in the heat exchange box 401, and recovers the heat energy through the circulation pipe 404. This heat recovery method not only reduces energy waste, but also provides a heat source for preheating the urea solution, further improving the energy utilization efficiency of the entire system. The electric heater 7 on the top of the urea tank 505 heats the urea solution to prevent it from crystallizing or solidifying at low temperatures, thereby ensuring the fluidity of the urea solution and enabling the urea nozzle 502 to spray the urea solution evenly and fully, thereby improving the efficiency of the SCR reaction.

Claims

1. An energy-saving and emission-reduction device for a diesel engine, characterized by: The invention comprises an exhaust pipe (1), one end of which is fixedly connected to an oxidation catalyst (2), and one end of which is fixedly connected to a particle trap (3) via a connecting pipe, and further comprises: A heat recovery mechanism (4) is fixedly connected to the particle collector (3) via a connecting pipe, one end of the heat recovery mechanism (4) is fixedly connected to a catalytic reduction tube mechanism (5) via the connecting pipe, and one end of the catalytic reduction tube mechanism (5) is fixedly connected to an exhaust pipe (6).

2. The energy-saving and emission-reduction device for a diesel engine according to claim 1, characterized in that: The heat energy recovery mechanism (4) comprises a heat exchange box (401) fixedly connected to the particle collector (3) via a connecting pipe, an extraction pump (402) fixedly connected to one side of the heat exchange box (401), an exchange medium and a heat exchange plate (403) are provided inside the heat exchange box (401), and a circulation pipe (404) is fixedly connected to one end of the extraction pump (402).

3. The energy-saving and emission-reduction device for a diesel engine according to claim 2, characterized in that: The catalytic reduction tube mechanism (5) comprises a catalytic tube (501) fixedly connected to a heat exchange box (401) via a connecting tube, a urea nozzle (502) being provided inside the catalytic tube (501), and a top of the urea nozzle (502) extending to the outside of the catalytic tube (501) and fixedly connected to a urea pipeline (503).

4. The energy-saving and emission-reduction device for a diesel engine according to claim 3, characterized in that: One end of the urea pipeline (503) is fixedly connected to a urea pump (504), and the end of the urea pump (504) is fixedly connected to a urea tank (505).

5. The energy-saving and emission-reduction device for a diesel engine according to claim 4, characterized in that: An electric heater (7) is provided on the top of the urea tank (505), and an electric heating pipe at the end of the electric heater (7) extends into the interior of the urea tank (505).

6. The energy-saving and emission-reduction device for a diesel engine according to claim 2, characterized in that: The circulation pipe (404) passes through the urea tank (505) and is fixedly connected to the other side of the heat exchange tank (401).

7. The energy-saving and emission-reduction device for a diesel engine according to claim 1, 2 or 4, characterized in that: The bottoms of the oxidation catalyst (2), the particle trap (3), the heat exchange box (401) and the urea tank (505) are all fixedly connected to a bracket (8), and one side of the bracket (8) is fixedly connected to a fixed beam (9).

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