CN211082029U

CN211082029U - Exhaust waste heat recovery and noise elimination integrated device for diesel engine

Info

Publication number: CN211082029U
Application number: CN201921719323.0U
Authority: CN
Inventors: 丁传安; 王武林
Original assignee: Yangzhou Polytechnic Institute
Current assignee: Yangzhou Polytechnic Institute
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-07-24
Anticipated expiration: 2029-10-10

Abstract

The utility model discloses a diesel engine exhaust waste heat recovery and integrative device of noise elimination belongs to the energy-conserving and exhaust aftertreatment technical field of engine, including exhaust inlet pipe, exhaust outlet pipe, heat pipe heat transfer tube section, cooling water jacket, exhaust side annular channel, porous circular baffle, inflation chamber, resonant cavity, middle cavity, the device encloses into the space by section of thick bamboo wall and the outer pipe wall of exhaust side and constitutes the cooling water jacket, and the heat pipe heat transfer section is arranged on water jacket upper portion, and the heat pipe is vertical to be placed. The exhaust waste heat of the diesel engine can be effectively recovered by utilizing a cooling water jacket and a heat pipe heat exchange section of efficient phase change heat exchange, the ambient inlet water temperature is increased by 25-35 ℃, and meanwhile, low and medium frequency noise can be effectively eliminated by utilizing a perforated pipe noise elimination structure, an expansion cavity, a resonant cavity, a middle cavity, an exhaust side annular channel and other structures of an exhaust inlet pipe; the integrated structure design of the exhaust waste heat recovery and noise elimination of the diesel engine is realized, and the dual functions of energy saving and environment protection are achieved.

Description

Exhaust waste heat recovery and noise elimination integrated device for diesel engine

Technical Field

The utility model relates to a diesel engine exhaust energy recuperation and the set composite that falls the noise, concretely relates to can retrieve diesel engine exhaust waste heat, can effectively reduce the device of exhaust noise again, belong to the energy-conserving and relevant technical field of exhaust aftertreatment of engine.

Background

The exhaust temperature of the engine is high, the energy loss which is usually taken away accounts for 30-40% of the total heat of the fuel, the engine is the part with the largest energy loss, and the engine is also one of the main reasons for causing the low thermal efficiency of the traditional engine. The exhaust heat of the engine is generally not recovered at present, and the reason is that the heat recovery device arranged in the exhaust system of the engine has certain difficulty in structural arrangement, and the waste heat recovery amount also changes along with the load change because the engine usually operates under variable working conditions, so that the difficulty in selecting a heat recovery and utilization method is increased; thirdly, a heat recovery system is arranged in the exhaust system, which may increase the resistance of the exhaust system and bring certain influence on the economy. Meanwhile, the compression ratio of the diesel engine is high, the maximum explosion pressure is large, exhaust noise pollution is generally more serious than that of a gasoline engine, and the noise reduction effect of an exhaust muffler installed in the existing diesel engine exhaust aftertreatment system faces more challenges in meeting increasingly strict national standard noise limits.

Disclosure of Invention

The utility model discloses an overcome current engine exhaust heat and generally can not effectively utilize, cause the engine thermal efficiency all to maintain the defect at a lower level, optimize through inner structure and parameter to diesel engine exhaust aftertreatment system, design one kind can be with exhaust energy recovery and noise control organic combination and structurally comparatively compact integral type device, realize the thermal efficiency and the economic nature that both improve the engine, can effectively reduce diesel engine exhaust noise again in order to satisfy the requirement of national standard to noise control.

According to the utility model provides a pair of integrative device of diesel engine exhaust waste heat recovery and noise elimination for among the diesel engine exhaust system, install before exhaust gas flows through the tail pipe (not shown) that the open-ended exhaust system between exhaust system and the environment corresponds. Preferably, the device is horizontally arranged in an assembled state and comprises an exhaust inlet pipe, an exhaust outlet pipe, a heat pipe heat exchange pipe section, a cooling water jacket, an exhaust side annular channel, an expansion cavity, a resonant cavity, a middle cavity, a porous circular partition plate and a cylinder wall of a recovery noise reducer. The right side of the recovery noise reducer is connected with an exhaust inlet pipe with a circular cross section, the left side of the recovery noise reducer is connected with an exhaust outlet pipe with a circular cross section, and the wall of the recovery noise reducer cylinder, the outer pipe wall of the exhaust side, the wall plate of the recovery noise reducer right side and the wall plate of the recovery noise reducer left side are enclosed into a space to form a cooling water jacket. In order to enhance the heat exchange effect between exhaust and water, the upper part of the cooling water jacket is provided with a heat pipe heat exchange pipe section, and the interior of the heat pipe heat exchange pipe section is divided into a heat exchanger air side and a heat exchanger water side under the separation of the outer pipe wall of the exhaust side. Because the heat exchange coefficients of the two sides are different, the heat exchange intensity of the water side is obviously higher than that of the air side, the length of the heat pipe in the air side of the heat exchanger is obviously longer than that of the heat pipe in the water side of the heat exchanger, the length ratio of the heat pipe in the air side of the heat exchanger to the heat pipe in the water side of the heat exchanger is not limited, and the ratio of the length of the heat pipe in the air side of the heat exchanger. In order to strengthen the heat exchange effect of the air side and expand the heat exchange area, the heat pipe fins are sleeved on the heat pipe in the air side of the heat exchanger. The heat pipe is vertically placed to realize the circulation of working media in the heat pipe by utilizing gravity, the working media in the heat pipe are selected, and water or methylbenzene is used as the working media according to the requirement of waste heat recovery at the working temperature of 20-250 ℃.

The exhaust inlet pipe sequentially penetrates through a right side wall plate of the recovery noise reducer, a right side cavity end baffle plate and a porous circular baffle plate and is communicated with the expansion cavity; the exhaust outlet pipe is connected with the left side wall plate of the recovery noise reducer. The recovery noise reduction device is internally provided with an exhaust side outer layer pipe wall with an elliptical middle section, the left end of the exhaust side outer layer pipe wall is connected to a left side wall plate of the recovery noise reduction device, and the right end of the exhaust side outer layer pipe wall is connected with a right side cavity end baffle. The inner wall of the outer pipe wall at the exhaust side is internally provided with an inner pipe wall at the exhaust side, the section of which is circular, and the left end of the inner pipe wall at the exhaust side is provided with a horn-shaped passage port, so that the resonant cavity is communicated with an exhaust outlet pipe; the right end of the inner pipe wall of the exhaust side is also provided with a contracted trumpet-shaped passage port, so that the middle cavity is communicated with the right cavity. An expansion cavity partition plate and a porous circular partition plate are connected with the inner wall of the exhaust side inner layer pipe, and the expansion cavity partition plate and the porous circular partition plate are in gapless connection with the exhaust side inner layer pipe wall. The exhaust side outer layer pipe wall, the exhaust side inner layer pipe wall, the right side cavity end baffle and the left side wall plate of the recovery noise reducer jointly form an exhaust side annular channel, and the right end part space of the exhaust side annular channel is a right side cavity; the right section part of the inner-layer pipe wall at the exhaust side and the right side of the porous circular partition plate form an internal space which is a middle cavity; the space formed by the right side of the expansion cavity partition plate, the left side of the porous circular partition plate and the middle section of the inner pipe wall of the exhaust side is an expansion cavity; the space formed by the left side of the expansion cavity clapboard and the left section of the inner-layer pipe wall at the exhaust side is a resonant cavity.

The pipe wall of the pipe section part of the exhaust inlet pipe in the middle cavity is provided with inlet pipe wall small holes, the small holes are uniformly distributed, and the hole diameter is 7 mm. The porous circular partition plate is provided with small holes, the small holes are uniformly distributed, and the aperture is 7 mm.

By applying the technical scheme of the invention, after exhaust of the diesel engine flows into the exhaust inlet pipe at a high speed, part of the exhaust flows into the expansion cavity, part of the exhaust flows into the middle cavity through the small holes on the pipe wall of the inlet pipe, the exhaust flowing into the expansion cavity is blocked by the partition plate of the expansion cavity, and the exhaust is deflected and returns to flow into the middle cavity through the small holes on the porous circular partition plate; the exhaust gas flows back and forth in the expansion cavity and the middle cavity, and the energy is attenuated, so that the aims of noise elimination and noise reduction are fulfilled. The two parts of exhaust gas flow rightwards after being collected in the middle cavity and enter the right cavity, are blocked by an end plate baffle of the right cavity, turn around to flow leftwards and enter an exhaust side annular channel between the inner layer pipe wall and the outer layer pipe wall of the exhaust side, and the energy is further attenuated when the exhaust gas flows through the annular channel; the process is accompanied with the heat exchange and cooling process of the exhaust gas and the cooling water, namely, the exhaust gas directly exchanges heat with the cooling water in the water jacket through the outer layer pipe wall at the exhaust side in a partition wall heat exchange mode in the process that the exhaust gas flows leftwards at the middle part and the lower part of the annular channel; meanwhile, the other part of the exhaust gas at the upper part of the annular channel flows through the heat pipe heat exchanger, and high-efficiency heat exchange can be realized, namely the exhaust gas exchanges heat with the working medium in the pipe of the heat pipe evaporation section arranged in the gas side of the heat exchanger, and the working medium in the pipe absorbs heat, is heated and gasified, and flows upwards along the inside of the heat pipe to enter the heat pipe condensation section; the exhaust gas is discharged to the atmosphere through the exhaust outlet pipe and the tail pipe after high-efficiency heat exchange and temperature reduction in the flowing process. After entering a cooling water jacket, a part of the inlet water from the cooling water inlet flows through the water side of the heat pipe heat exchanger to perform high-efficiency heat exchange with the working medium in the heat pipe condensation section, the working medium in the heat pipe releases heat, cools and condenses, and flows downwards to the heat pipe evaporation section along the inner wall of the heat pipe to form repeated circulation of the working medium in the heat pipe, and meanwhile, the inlet water on the water side of the heat exchanger is heated and heated; and the other part of the inlet water is heated by the exhaust gas in the annular channel at the exhaust side in a partition wall heat exchange mode, and the two parts of the heated inlet water flow out from the cooling water outlet after being converged in the water jacket.

The exhaust waste heat recovery and noise elimination integrated device for the diesel engine has the following beneficial effects:

1. the utility model discloses can effectively retrieve diesel engine exhaust waste heat. The device utilizes a cooling water jacket, particularly a heat pipe heat exchanger with the characteristic of efficient phase change heat exchange is configured, the water-gas heat exchange effect is enhanced, the waste heat of engine exhaust can be effectively recovered, the amount and proportion of the recovered heat and the improvement degree of economy are mainly related to the displacement of an engine and the current working load, and under the conditions of stable working condition, over medium load and the condition that the flow control of cooling water is matched with the displacement of the engine, cooling inlet water in an environmental state can be heated by exhaust, the temperature is increased by 25-35 ℃, and the heat efficiency of the engine is increased by 2-3%. It should be particularly noted that the device and the heat recovery method are particularly suitable for recovering exhaust waste heat of a marine diesel engine or a diesel generating set with large discharge capacity, because the operation working condition of the equipment is stable, and hot water provided by the recovery device can conveniently meet the living purposes of showering, heating and the like of passengers on a ship or people around fixed power generation equipment.

2. The utility model discloses compact structure, spatial arrangement are reasonable. The design of combining the dividing wall heat exchange of the water jacket with the phase change heat exchange of the heat pipe exchanger obviously improves the heat exchange efficiency of exhaust waste heat recovery and has the characteristic of compact structure; the heat pipe is vertically arranged, working medium circulation is realized by using gravity, a pipe core is not required to be arranged in the heat pipe, and the structure of the heat pipe exchanger is simplified.

3. The utility model discloses can realize waste heat recovery and the effective combination of function of making an uproar falls in the noise elimination. The device utilizes the perforated pipe silencing structure and the structures of the expansion cavity, the resonant cavity, the middle cavity, the exhaust side annular channel and the like of the exhaust inlet pipe, and can effectively eliminate low and medium frequency noise. The integrated design of the device utilizes the combination of the exhaust side annular channel, the water jacket and the heat exchange pipe section of the heat pipe, optimizes the whole exhaust aftertreatment system, and ensures that the device has double functions of saving energy and protecting the environment.

Drawings

Fig. 1 shows a schematic structural diagram of an exhaust waste heat recovery and noise elimination integrated device for a diesel engine provided by an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a diesel engine exhaust gas waste heat recovery and noise elimination integrated device obtained by cutting at the position A-A in FIG. 1.

The reference numerals in the figures denote:

1 retrieve 2 exhaust outlet pipe 3 expansion chamber baffle 4 expansion chamber 5 heat pipe condensation segment of device of making an uproar 2

6 heat exchanger water side 7 heat exchanger air side 8 heat pipe heat exchange pipe section 9 heat pipe evaporation section 10 heat pipe fin

11 cooling water inlet 12 right side cavity 13 exhaust inlet pipe 14 recovery noise reducer right side wallboard

15 right side cavity end baffle 16, inlet pipe wall small hole 17, exhaust side annular channel 18, exhaust side outer layer pipe wall

19 middle cavity 20 exhaust side inner layer pipe wall 21 recovery noise reducer cylinder wall 22 porous circular partition plate

23 cooling water outlet 24 resonant cavity 25 recovery noise reducer left side wall plate 26 cooling water jacket

Detailed Description

The technical scheme of the utility model is further explained in detail with the attached drawings as follows:

an integrated device for recovering waste heat and silencing exhaust gas of a diesel engine, as shown in fig. 1 and 2, is used in an exhaust system of a diesel engine (not shown), and is installed before exhaust gas flows through a tail pipe (not shown) corresponding to the exhaust system including the exhaust system and the environment. Preferably, the recovery noise reduction device is horizontally arranged in an assembled state and comprises an exhaust inlet pipe 13, an exhaust outlet pipe 2, a heat pipe heat exchange pipe section 8, a cooling water jacket 26, an exhaust side annular channel 17, an expansion cavity 4, a resonant cavity 24, an intermediate cavity 19, a porous circular partition plate 22 and a recovery noise reducer cylinder wall 21. The right side of the recovery noise reducer is connected with an exhaust inlet pipe 13 with a circular cross section, the left side of the recovery noise reducer is connected with an exhaust outlet pipe 2 with a circular cross section, and a cooling water jacket 26 is formed by a space surrounded by the recovery noise reducer cylinder wall 21, the exhaust side outer layer pipe wall 18, the recovery noise reducer right side wall plate 14 and the recovery noise reducer left side wall plate 25. The upper part of the cooling water jacket is provided with a heat pipe heat exchange pipe section 8, the interior of the heat pipe heat exchange pipe section is divided into a heat exchanger air side 7 and a heat exchanger water side 6 under the separation of an exhaust side outer layer pipe wall 18, the length of the heat pipe in the heat exchanger air side is larger than that of the heat pipe in the heat exchanger water side, the length ratio of the heat pipe in the heat exchanger air side to that of the heat pipe in the water side is not limited, the ratio of the heat pipe in the heat exchanger air side to that of the heat pipe in the water side is 2: 1, and the heat. The heat pipe is vertically placed to realize the circulation of working media in the heat pipe by utilizing gravity, the working media in the heat pipe are selected, and water or methylbenzene is used as the working media according to the requirement of waste heat recovery at the working temperature of 20-250 ℃.

The exhaust inlet pipe 13 sequentially penetrates through a right side wall plate 14 of the recovery noise reducer, a right side cavity end baffle plate 15 and a porous circular baffle plate 22 and is communicated with the expansion cavity 4; the exhaust gas outlet pipe 2 is connected to the left side wall plate 25 of the noise reducer. An exhaust side outer layer pipe wall 18 with an elliptical middle section is arranged in the recycling noise reduction device, the left end of the exhaust side outer layer pipe wall 18 is connected to a left side wall plate 25 of the recycling noise reducer, and the right end of the exhaust side outer layer pipe wall is connected with a right side cavity end baffle 15. The inner wall of the outer pipe wall at the exhaust side is internally provided with an inner pipe wall 20 at the exhaust side, the left end of the inner pipe wall at the exhaust side is provided with a horn-shaped passage port, so that the resonant cavity 24 is communicated with the exhaust outlet pipe 2; the right end of the inner pipe wall of the exhaust side is also provided with a contracted trumpet-shaped passage port, so that the middle cavity 19 is communicated with the right cavity 12. An expansion cavity partition plate 3 and a porous circular partition plate 22 are connected inside the exhaust side inner layer pipe wall, and the expansion cavity partition plate 3 and the porous circular partition plate 22 are in gapless connection with the exhaust side inner layer pipe wall. The exhaust side outer layer pipe wall 18, the exhaust side inner layer pipe wall 20, the right side cavity end baffle 15 and the recovery noise reducer left side wall plate 25 jointly form an exhaust side annular channel 17, and the right end part space of the exhaust side annular channel is a right side cavity 12; the inner space formed by the right section part of the inner-layer pipe wall at the exhaust side and the right side of the porous circular partition plate 22 is a middle cavity 19; the space formed by the right side of the expansion cavity partition plate 3, the left side of the porous circular partition plate 22 and the middle section of the exhaust side inner-layer pipe wall 20 is an expansion cavity 4; the space formed by the left side of the expansion cavity partition plate 3 and the left section of the inner-layer pipe wall on the exhaust side is a resonant cavity 24.

The exhaust inlet pipe 13 is provided with inlet pipe wall pores 16 on the pipe wall of the pipe section part in the middle cavity 19, the pores are uniformly distributed in the embodiment, and the pore diameter is 7 mm. The porous circular partition 22 is provided with small holes, the small holes are uniformly distributed in the embodiment, and the aperture is 7 mm.

After the exhaust of the diesel engine flows into the exhaust inlet pipe 13 at high speed, the exhaust flows into the expansion cavity 4 or flows into the middle cavity 19 through the small holes 16 on the pipe wall of the inlet pipe respectively, and the exhaust flowing into the expansion cavity 4 is deflected and flows into the middle cavity 19 through the porous circular partition plate 22; the two parts of exhaust gas are converged and then enter the right cavity 12, turn around and flow into the exhaust side annular channel 17 leftwards, the energy is further attenuated in the process and the heat exchange and cooling process are carried out, namely, the exhaust gas and the water in the water jacket exchange heat in a partition wall heat exchange mode in the process of flowing leftwards in the middle and the lower part of the annular channel; exhaust gas at the upper part of the annular channel flows through a heat pipe heat exchange pipe section 8 to exchange heat with an in-pipe working medium of a heat pipe evaporation section 9 arranged in the air side 7 of the heat exchanger, the in-pipe working medium absorbs heat, is heated and gasified, and flows upwards into a heat pipe condensation section 5 along the inside of the pipe; and after the exhaust gas is subjected to high-efficiency heat exchange and temperature reduction in the process, the exhaust gas is discharged through a tail pipe through an exhaust outlet pipe. After the inlet water from the cooling water inlet 11 enters the cooling water jacket, a part of the inlet water flows through the water side 6 of the heat pipe heat exchanger to be heated and heated; and the other part of the inlet water is heated and heated in a partition wall heat exchange mode, and the two parts of the inlet water are heated, merged and then flow out from the cooling water outlet 23.

The above embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, other embodiments obtained by a person of ordinary skill in the art without creative work all belong to the protection scope of the present invention.

Claims

1. A diesel engine exhaust waste heat recovery and noise elimination integrated device comprises an exhaust inlet pipe (13), an exhaust outlet pipe (2), a heat pipe heat exchange pipe section (8), a cooling water jacket (26), an exhaust side annular channel (17), an expansion cavity (4), a resonant cavity (24), a middle cavity (19), a porous circular partition plate (22) and a recovery noise reducer cylinder wall (21), and is characterized in that the right side of the device is connected with the exhaust inlet pipe (13) with a circular cross section, and the left side of the device is connected with the exhaust outlet pipe (2) with a circular cross section; the recovery noise reducer cylinder wall (21), the exhaust side outer layer pipe wall (18), the recovery noise reducer right side wall plate (14) and the recovery noise reducer left side wall plate (25) enclose a space to form a cooling water jacket (26), a heat pipe heat exchange pipe section (8) is arranged on the upper portion of the cooling water jacket (26), the interior of the heat pipe heat exchange pipe section is divided into a heat exchanger air side (7) and a heat exchanger water side (6) under the separation of the exhaust side outer layer pipe wall (18), the length of an inner heat pipe in the heat exchanger air side (7) is larger than that of an inner heat pipe in the heat exchanger water side (6), the length ratio of the inner heat pipe is not limited, and the ratio of the heat pipe length in the heat exchanger air side to that in the; a heat pipe fin (10) is sleeved on the heat pipe in the air side of the heat exchanger; the heat pipe is vertically placed, working media in the heat pipe are selected, and water or methylbenzene is used as the working media according to the requirement of waste heat recovery at the working temperature of 20-250 ℃; the exhaust inlet pipe sequentially penetrates through a right side wall plate (14) of the recovery noise reducer, a right side cavity end baffle plate (15) and a porous circular partition plate (22) and is communicated with the expansion cavity (4); the exhaust outlet pipe (2) is connected with a left side wall plate (25) of the recovery noise reducer; an exhaust side outer layer pipe wall (18) with an elliptical middle section is arranged in the device, the left end of the exhaust side outer layer pipe wall (18) is connected to a left side wall plate (25) of the recovery noise reducer, and the right end of the exhaust side outer layer pipe wall is connected with a right side cavity end baffle (15); the inner wall of the outer pipe wall at the exhaust side is internally provided with an inner pipe wall (20) at the exhaust side, the left end of the inner pipe wall at the exhaust side is provided with a horn-shaped passage port, so that the resonant cavity (24) is communicated with the exhaust outlet pipe (2); the right end of the inner-layer pipe wall of the exhaust side is also provided with a contracted trumpet-shaped passage port, so that the middle cavity (19) is communicated with the right cavity (12); an expansion cavity partition plate (3) and a porous circular partition plate (22) are connected inside the exhaust side inner layer pipe wall, and an exhaust side annular channel (17) is formed by the exhaust side outer layer pipe wall (18), the exhaust side inner layer pipe wall (20), a right side cavity end baffle plate (15) and a left side wall plate (25) of the recovery noise reducer.

2. The exhaust waste heat recovery and noise elimination integrated device of the diesel engine as claimed in claim 1, wherein the exhaust inlet pipe (13) is provided with inlet pipe wall pores (16) on the pipe wall of the pipe section part in the middle cavity (19), and the pores are uniformly distributed; the porous circular partition plate (22) is provided with small holes which are uniformly distributed.