A marine engine exhaust gas waste heat recovery device

Abstract

The utility model relates to a ship related field especially is a kind of ship engine exhaust waste heat recovery device, including water pipe, outer tube, exhaust passage, air inlet pipe, sealing plug, annular orifice plate and partition plate etc.

Description

Technical Field

[0001] This utility model relates to the field of shipbuilding, and in particular to a waste heat recovery device for ship engine exhaust. Background Technology

[0002] Marine engines generate power by burning fuels (such as diesel, heavy oil, LNG, etc.). The combustion process of these fuels inevitably produces exhaust gases. In pursuit of high power and thermal efficiency, marine engines have compression ratios and combustion temperatures much higher than those of automobile engines, resulting in high-temperature exhaust gases. These high-temperature exhaust gases, when directly emitted into the air, can easily pollute the environment and waste resources. Therefore, modern ships are generally equipped with dedicated waste heat recovery devices. These devices recover excess heat from the exhaust gases and convert it into usable energy, turning waste into treasure, improving the ship's energy utilization efficiency, and reducing energy consumption and emissions.

[0003] Existing waste heat recovery devices come in various forms. For example, high-temperature waste gas can be used to heat low-temperature water for use through heat exchange. However, the uniformity of high-temperature waste gas flow is poor, which can reduce the uniformity of heating of low-temperature water and affect the heating effect. In addition, engine exhaust contains water vapor, which will form condensate when it cools down. This condensate can easily accumulate in the exhaust gas delivery pipeline. The condensate combines with sulfur oxides in the exhaust gas to form acidic water, which corrodes the exhaust gas delivery pipeline and reduces the service life of the device. Furthermore, during the combustion process of marine engines, especially diesel engines or dual-fuel engines, fuel cannot be completely burned, which can easily form carbon-containing dust. This dust can easily accumulate in the exhaust gas delivery pipeline, which can not only block the pipeline but also affect the heat exchange efficiency of high-temperature waste gas to low-temperature water, thus reducing the effectiveness of the waste heat recovery device. Summary of the Invention

[0004] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a waste heat recovery device for marine engine exhaust gas to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a waste heat recovery device for marine engine exhaust gas, comprising a water supply pipe, an outer pipe, an exhaust gas passage, an air inlet pipe, an annular perforated plate, and a partition plate; the water supply pipe is fitted with an outer pipe, and a gap is provided between the outer surface of the water supply pipe and the inner ring of the outer pipe to form an exhaust gas passage, the top left end of the outer pipe is connected to the air inlet pipe, and the bottom right end of the outer pipe is provided with a discharge structure for discharging condensate; The exhaust gas passage is equipped with two or more annular perforated plates. The inner and outer rings of the annular perforated plates are respectively connected to the outer surface of the water supply pipe and the inner ring of the outer pipe, and the holes of each annular perforated plate are staggered. Each annular orifice plate is located on one side of the air inlet pipe. Two or more partition plates are provided on the other side of the annular orifice plate away from the air inlet pipe. Each partition plate is installed along the circumference of the water supply pipe. The end of the partition plate away from the water supply pipe is connected to the inner ring of the outer pipe. A cleaning mechanism is provided outside the annular perforated plate, which is used to clean the dust on the annular perforated plate.

[0006] Preferably, a sealing plug is installed in the exhaust gas passage, and the sealing plug and the annular perforated plate are located on both sides of the intake pipe.

[0007] Preferably, the air intake pipe is inclined, with the air intake pipe and the outer pipe axis forming an inclination angle of 20° to 30°.

[0008] Preferably, the partition plates outside the water supply pipe are distributed in a ring with equal spacing.

[0009] Preferably, the discharge structure includes a condensate discharge pipe connected to the bottom of the outer pipe and located away from the end of the air intake pipe, and a one-way valve is installed on the condensate discharge pipe.

[0010] Preferably, the condensate drain pipe is located on the side of the partition plate away from the annular perforated plate.

[0011] Preferably, the cleaning mechanism includes a collection frame embedded in the bottom of the outer tube, a detachable tray installed at the bottom of the collection frame, two or more micro nozzles corresponding to each of the annular perforated plates embedded in the outer tube, the air outlet of the micro nozzles facing the windward side of the annular perforated plates, the collection frame located below all the annular perforated plates, and two or more baffles installed on the tray, each baffle corresponding to the bottom end face of each annular perforated plate.

[0012] Preferably, the top surface of the baffle is a downwardly concave arc-shaped surface, which fits against the bottom of the annular perforated plate.

[0013] The beneficial effects of this utility model are: This invention utilizes multiple annular perforated plates with staggered perforations, along with multiple partition plates, to forcefully agitate the high-temperature exhaust gas and distribute it more evenly outside the conveying pipe. This results in more uniform heating of the low-temperature water inside the conveying pipe, improving the heat exchange efficiency. Furthermore, a discharge structure at the end of the outer pipe allows for the discharge of condensate, preventing its accumulation and corrosion by sulfur oxides in the exhaust gas, thus extending the device's lifespan. The annular perforated plates also filter the high-temperature exhaust gas, blocking carbonaceous dust. A cleaning device removes this dust from the plates, preventing dust accumulation between the outer and water pipes and thus preventing blockages. This enhances the heat exchange efficiency between the high-temperature exhaust gas and the low-temperature water, improving the overall performance of the waste heat recovery device. Attached Figure Description

[0014] Figure 1 This is a front view cross-sectional structural diagram of the waste heat recovery device of this utility model; Figure 2 This is a schematic diagram of the waste heat recovery device of this utility model; Figure 3 This is a cross-sectional structural diagram of the waste heat recovery device of this utility model; Figure 4 This is the utility model Figure 3 Enlarged schematic diagram of the structure at point A; Figure 5 This is a schematic diagram of the waste heat recovery device of this utility model from the left side.

[0015] Among them: water supply pipe-1, outer pipe-2, exhaust gas passage-3, air inlet pipe-4, sealing plug-5, annular orifice plate-6, partition plate-7, condensate drain pipe-8, one-way valve-9, micro nozzle-10, collection frame-11, tray-12, baffle-13. Detailed Implementation

[0016] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0017] like Figures 1 to 5 As shown, this utility model provides a waste heat recovery device for marine engine exhaust gas, including a water supply pipe 1, an outer pipe 2, an exhaust gas passage 3, an air inlet pipe 4, an annular perforated plate 6, and a partition plate 7; the outer pipe 2 is sleeved on the water supply pipe 1 with the outer pipe 2 at the same center, and a gap is provided between the outer surface of the water supply pipe 1 and the inner circle of the outer pipe 2 to form an exhaust gas passage 3 for conveying high-temperature exhaust gas; the top left end of the outer pipe 2 is connected to the air inlet pipe 4 for introducing high-temperature exhaust gas, and the bottom right end of the outer pipe 2 is provided with a discharge structure for discharging condensate; Three annular perforated plates 6 are installed in the exhaust gas passage 3. The inner and outer rings of the annular perforated plates 6 are respectively connected to the outer surface of the water supply pipe 1 and the inner ring of the outer pipe 2, and the holes of the three annular perforated plates 6 are staggered. All the annular orifice plates 6 are located on the lower right side of the air inlet pipe 4. Eight partition plates 7 are arranged in annular and equally spaced arrangement on the right side of all the annular orifice plates 6. Each partition plate 7 is installed along the circumference of the water supply pipe 1 to guide the high temperature exhaust gas evenly to the outside of the water supply pipe 1. The end of the partition plate 7 away from the water supply pipe 1 is connected to the inner ring of the outer pipe 2. A cleaning mechanism is provided outside the annular orifice plate 6, which is used to clean the dust on the annular orifice plate 6. Among them, the air inlet pipe 4 is inclined, and the air inlet pipe 4 is inclined at a 30° angle to the axis of the outer pipe 2, so as to reduce the impact of the high temperature exhaust gas input by the air inlet pipe 4 on the water supply pipe 1, and facilitate the high temperature exhaust gas to pass through the air inlet pipe 4 and flow quickly in the exhaust gas channel 3. In this embodiment, an annular sealing plug 5 is installed in the exhaust gas passage 3. The sealing plug 5 is located on the underside of the intake pipe 4. The sealing plug 5 prevents the high-temperature exhaust gas input into the exhaust gas passage 3 from flowing back. In this embodiment, the discharge structure includes a condensate discharge pipe 8 connected to the bottom right end of the outer pipe 2. The condensate discharge pipe 8 extends obliquely to the lower right and a one-way valve 9 is installed on the condensate discharge pipe 8. The condensate drain pipe 8 is located on the lower right side of the partition plate 7; Preferably, the cleaning mechanism includes a collection frame 11 fixedly embedded in the bottom of the outer tube 2 and a tray 12 fixed to the bottom of the collection frame 11 by bolts; Three micro nozzles 10 are embedded in the top of the outer tube 2. The three micro nozzles 10 correspond one-to-one with the three annular orifice plates 6. The air outlet of the micro nozzles 10 faces the windward side of the annular orifice plate 6. The collection frame 11 is located below all the annular orifice plates 6. Three baffles 13 are installed on the support plate 12. Each baffle 13 is attached to the bottom end face of each annular orifice plate 6. In order to ensure that the baffle 13 can be stably attached to the bottom surface of the annular perforated plate 6, the top surface of the baffle 13 is a downwardly concave arc surface, and the arc surface is attached to the bottom of the annular perforated plate 6. In the above, the water supply pipe 1, the outer pipe 2, the air inlet pipe 4, the annular orifice plate 6, the partition plate 7, the condensate drain pipe 8, the collection frame 11, the tray 12, and the baffle 13 are all made of stainless steel. Specifically, the end of the air intake pipe 4 is connected to the exhaust end of the ship's engine, one end of the water supply pipe 1 near the air intake pipe 4 is connected to the cold water input end, the other end of the water supply pipe 1 with the condensate drain pipe 8 is connected to the hot water use equipment, or connected to the hot water use location, and the micro nozzle 10 is connected to the marine compressed air system through a pipe. When the ship's engine is in use, the exhaust gas produced enters the exhaust gas passage 3 through the intake pipe 4. The high-temperature exhaust gas passes through each annular perforated plate 6 in sequence. Since the holes on each annular perforated plate 6 are staggered, the high-temperature exhaust gas is disrupted by the annular perforated plate 6. Then, multiple partition plates 7 guide the high-temperature exhaust gas evenly to various areas outside the water supply pipe 1. When the high-temperature exhaust gas flows, it heats the low-temperature water in the water supply pipe 1, and the temperature of the high-temperature exhaust gas decreases. The heated low-temperature water can be used to realize the recovery of waste heat from the ship's engine exhaust gas. The condensate generated during the high-temperature exhaust gas transportation process flows in the exhaust gas passage 3 and flows into the condensate discharge pipe 8. After the one-way valve 9 is opened, the condensate in the condensate discharge pipe 8 is discharged. When the high-temperature exhaust gas passes through the annular perforated plate 6, the annular perforated plate 6 can play a certain role in blocking dust, reducing the large-area accumulation of dust between the water supply pipe 1 and the outer pipe 2. Compressed gas is input into the micro nozzle 10 through the marine compressed air system. The gas is discharged downward through the micro nozzle 10, blowing the dust on the annular perforated plate 6 into the collection frame 11 for collection. The detachable tray 2 can be used to remove and process the dust on the tray 2, reducing the dust on the annular perforated plate 6, which is conducive to the rapid passage of high-temperature exhaust gas and also reduces the subsequent cleaning work.

[0018] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery device for marine engine exhaust gas, comprising a water supply pipe; Its features are, An outer pipe is fitted onto the water supply pipe, and a gap is provided between the outer surface of the water supply pipe and the inner ring of the outer pipe to form an exhaust gas channel. An air inlet pipe is connected to the top of one end of the outer pipe, and an exhaust structure for discharging condensate is provided at the bottom of the other end of the outer pipe. The exhaust gas passage is equipped with two or more annular perforated plates. The inner and outer rings of the annular perforated plates are respectively connected to the outer surface of the water supply pipe and the inner ring of the outer pipe, and the holes of each annular perforated plate are staggered. Each annular orifice plate is located on one side of the air inlet pipe. Two or more partition plates are provided on the other side of the annular orifice plate away from the air inlet pipe. Each partition plate is installed along the circumference of the water supply pipe. The end of the partition plate away from the water supply pipe is connected to the inner ring of the outer pipe. A cleaning mechanism is provided outside the annular perforated plate, which is used to clean the dust on the annular perforated plate.

2. The waste heat recovery device for marine engine exhaust gas according to claim 1, characterized in that: A sealing plug is installed inside the exhaust gas passage, and the sealing plug and the annular orifice plate are located on both sides of the intake pipe, respectively.

3. The waste heat recovery device for marine engine exhaust gas according to claim 1, characterized in that: The intake pipe is inclined, with the intake pipe and the outer pipe axis inclined at an angle of 20° to 30°.

4. The waste heat recovery device for marine engine exhaust gas according to claim 1, characterized in that: The partition plates outside the water supply pipe are distributed in a ring at equal intervals.

5. The waste heat recovery device for marine engine exhaust gas according to claim 1, characterized in that: The discharge structure includes a condensate discharge pipe connected to the bottom of the outer pipe and located away from the end of the air intake pipe, and a one-way valve is installed on the condensate discharge pipe.

6. The waste heat recovery device for marine engine exhaust gas according to claim 5, characterized in that: The condensate drain pipe is located on the side of the partition plate away from the annular orifice plate.

7. The waste heat recovery device for marine engine exhaust gas according to claim 1, characterized in that: The cleaning mechanism includes a collection frame embedded in the bottom of the outer tube, a detachable tray installed at the bottom of the collection frame, and two or more micro nozzles embedded in the outer tube corresponding to each of the annular perforated plates. The air outlet of the micro nozzles faces the windward side of the annular perforated plates. The collection frame is located below all the annular perforated plates. Two or more baffles are installed on the tray, and each baffle is attached to the bottom end face of each annular perforated plate.

8. The waste heat recovery device for marine engine exhaust gas according to claim 7, characterized in that: The top surface of the baffle is a downwardly concave arc-shaped surface, which fits into the bottom of the annular perforated plate.

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