A marine diesel engine exhaust heat recovery device

Abstract

The utility model discloses a kind of ship diesel engine exhaust heat recovery devices, it is related to ship diesel engine technical field, including flue gas pipe, the upper portion of the flue gas pipe is provided with recovery pipe, the inside of the recovery pipe is provided with heat exchange cylinder;Guiding component, the guiding component is set in heat exchange cylinder;Among them, guiding component includes the vane being set in heat exchange cylinder, also includes obliquely inserted into recovery pipe and penetrates into the air inlet pipe in heat exchange cylinder;The guiding component further includes the pipeline being communicated at the outer end of air inlet pipe, the lower end of the pipeline is communicated with flue gas pipe, the flue gas is formed heat exchange operation by pipeline and air inlet pipe side into the heat exchange cylinder of recovery pipe.The utility model has beneficial effect for: by traditional from bottom to top smoke mode is improved as obliquely inserted side into flue gas, can make whether high or low load flue gas can pass from the inner wall of heat exchange cylinder and discharge outward, can effectively improve the contact effect of flue gas and heat exchange cylinder, improve heat conduction efficiency.

Description

Technical Field

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

[0002] Marine diesel engines generate a large amount of high-temperature flue gas during operation, and the waste heat carried by this gas has high recovery value. Utilizing the waste heat from exhaust gas to heat the working medium or generate electricity has become an important way to improve the energy efficiency of ships. Common waste heat recovery devices usually install heat exchangers in the exhaust ducts to transfer the heat energy in the flue gas to the working medium through heat exchange.

[0003] Reference publication number: CN209838507U. This utility model discloses a waste heat recovery device for marine diesel engine exhaust, including a heat exchanger, a connecting pipe disposed at the bottom of the heat exchanger, and a chimney detachably installed at the top of the heat exchanger. The heat exchanger includes a double-layer heat exchange cylinder. The bottom and top of the heat exchange cylinder are respectively provided with a water inlet and a water outlet for cooling water flow. The inner wall of the heat exchange cylinder is provided with several heat exchange grooves with an arc-shaped cross section. A connecting pin is movably installed at the center of the heat exchange cylinder. A drive fan blade is fixedly installed at the bottom of the connecting pin. A cleaning brush is fixedly installed on the circumferential surface of the connecting pin. The cleaning brush slides in contact with the inner wall of the heat exchange cylinder and the inner wall of the heat exchange groove. This utility model has a reasonable structural design, which avoids the adsorption and accumulation of smoke dust in the exhaust gas on the surface of the heat exchange medium, and improves the efficiency of exhaust waste heat recovery.

[0004] Although the above-mentioned device can recover waste heat, its air intake method is vertical air intake from bottom to top. However, its heat exchange efficiency largely depends on the flow rate of the flue gas. When the diesel engine is running at high load, the exhaust volume is large and the flow rate is high. The flue gas can have good turbulent contact with the inner wall of the heat exchange cylinder, thereby achieving effective heat exchange. However, the operating conditions of marine diesel engines are complex and variable, and they are frequently in low-load states such as low-speed cruising or idling. Under such conditions, the exhaust flow rate is significantly reduced, and the contact effect between the flue gas and the heat exchange structure is poor. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A waste heat recovery device for marine diesel engine exhaust includes a flue pipe, a recovery pipe is provided above the flue pipe, and a heat exchange cylinder is provided inside the recovery pipe. A guiding component, wherein the guiding component is disposed inside the heat exchange cylinder; The guiding component includes blades disposed in the heat exchange cylinder, and an air inlet pipe that is obliquely inserted into the recovery pipe and extends through the heat exchange cylinder.

[0007] As a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust according to this utility model, the guiding component further includes a pipe connected to the outer end of the air intake pipe, the lower end of the pipe being connected to the flue gas pipe, and the flue gas entering the heat exchange cylinder of the recovery pipe laterally through the pipe and the air intake pipe to form a heat exchange operation.

[0008] As a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust according to this utility model, the exhaust port of the air inlet pipe is designed to be flat and narrow to increase the exhaust gas rate.

[0009] As a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust of the present invention, the inner wall of the heat exchange cylinder is provided with a plurality of heat exchange grooves in a linear array, and the guide component further includes a scraper disposed in the heat exchange groove and integrally connected to the edge of the blade, wherein the scraper is in a close fit with the inner arc of the heat exchange groove.

[0010] As a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust of the present invention, wherein: an air port is provided in the middle of the scraper, and the air port is used to allow a small amount of exhaust gas to pass through.

[0011] As a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust according to this utility model, the air inlet is opened at an angle, and the flue gas of the air inlet is guided towards the inner wall of the heat exchange cylinder.

[0012] As a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust of this utility model, the blade is provided with six swing blades, and the thickness of each swing blade increases sequentially from the center to the outside.

[0013] As a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust of this utility model, the interior of the heat exchange cylinder is hollow, and the inner side of the heat exchange cylinder near the blades is made of stainless steel.

[0014] In a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust described in this utility model, the hollow part of the heat exchange cylinder is a liquid retention chamber.

[0015] As a preferred embodiment of the waste heat recovery device for marine diesel engine exhaust of this utility model, wherein: the upper and lower parts on both sides of the recovery pipe are connected to liquid pipes that penetrate into the heat exchange cylinder, and the two liquid pipes are an inlet pipe and an outlet pipe, respectively.

[0016] The beneficial effects of this utility model are as follows: by improving the traditional bottom-up flue gas inlet method to a slanted side-entry flue gas, the flue gas, regardless of high or low load, can pass through the inner wall of the heat exchange cylinder and be discharged outward, which can effectively improve the contact effect between the flue gas and the heat exchange cylinder and enhance the heat transfer efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is an overall structural diagram of a waste heat recovery device for marine diesel engine exhaust.

[0018] Figure 2 This is a breakdown diagram of the internal structure of the recovery pipe in a marine diesel engine exhaust waste heat recovery device.

[0019] Figure 3 A partial structural diagram of the heat exchanger cylinder for a waste heat recovery device for marine diesel engine exhaust.

[0020] Figure 4 This is a disassembled structural diagram of the heat exchanger and blades of a waste heat recovery device for marine diesel engine exhaust.

[0021] The following numbers are labeled in the diagram: 100, flue gas pipe; 110, recovery pipe; 120, heat exchange cylinder; 121, hollow section; 122, heat exchange tank; 130, liquid pipe; 200, guide assembly; 210, pipe; 211, air inlet pipe; 220, blade; 221, scraper; 222, air outlet. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide 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 can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "an embodiment" or "embodiment" as used 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 different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0025] Example 1: Reference Figures 1-4 This is the first embodiment of the present utility model. This embodiment provides a waste heat recovery device for marine diesel engine exhaust, including a flue pipe 100, a recovery pipe 110 above the flue pipe 100, and a heat exchange cylinder 120 inside the recovery pipe 110. The aforementioned flue pipe 100 is the main connecting component to the exhaust port of the marine diesel engine. When the diesel engine is running, the high-temperature flue gas generated will first enter the flue pipe 100 and then enter the recovery pipe 110 for heat recovery. Guide component 200, which is disposed inside heat exchange cylinder 120; The guide assembly 200 includes blades 220 disposed in the heat exchange cylinder 120, and an air inlet pipe 211 that is obliquely inserted into the recovery pipe 110 and extends through the heat exchange cylinder 120.

[0026] To address the problem of poor heat transfer when flue gas rises from the bottom up and is located in the middle of the heat exchange cylinder 120, this embodiment designs an air inlet pipe 211 with side air intake, and combines it with a gas-driven blade 220 that creates turbulence in the air field and improves the contact effect between the gas and the heat exchange cylinder 120, which can significantly improve the heat recovery effect in the flue gas. Example 2: Reference Figures 2-4 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0027] Specifically, the guide assembly 200 also includes a pipe 210 connected to the outer end of the air inlet pipe 211. The lower end of the pipe 210 is connected to the flue gas pipe 100. The flue gas enters the heat exchange cylinder 120 of the recovery pipe 110 laterally through the pipe 210 and the air inlet pipe 211 to form a heat exchange operation.

[0028] The duct 210 serves as a diversion channel for flue gas, and its core function is to guide the mainstream flue gas uninterruptedly to the lateral intake path. It ensures that the intake mode of the entire device is completely transformed from the traditional bottom axial flow to a more optimized lateral tangential flow, providing a structural basis for generating a strong rotating vortex inside the heat exchanger 120, which is a prerequisite for achieving efficient heat exchange under all operating conditions.

[0029] Specifically, the air outlet 222 of the air inlet pipe 211 is designed to be flat and narrow to increase the exhaust rate of the flue gas.

[0030] The flat and narrow nozzle type air outlet 222 is designed to increase the injection speed of flue gas by reducing the flow cross-sectional area.

[0031] Specifically, the inner wall of the heat exchange cylinder 120 is provided with a plurality of heat exchange grooves 122 in a linear array. The guide assembly 200 also includes a scraper 221 disposed in the heat exchange groove 122 and integrally connected to the edge of the blade 220. The scraper 221 is in a close fit with the inner arc of the heat exchange groove 122.

[0032] The linear array of heat exchange slots 122 greatly increases the inner surface area of ​​the heat exchange cylinder 120, thereby directly increasing the heat exchange per unit time. The scraper 221, which is integrally connected with the blade 220, is built into the heat exchange tank 122. When the blade 220 rotates, the scraper 221 follows closely behind. Its outline is precisely fitted with the inner arc surface of the heat exchange tank 122, which can accurately scrape away the smoke and dust accumulated in the tank. This solves the problem of dead corners that are difficult to clean with traditional smooth wall cylinders or convex fins, and achieves a combination of efficient heat exchange and deep cleaning. Specifically, the scraper 221 has an air inlet 222 in the middle, which is used to allow a small amount of flue gas to pass through. The air inlet 222 is opened at an angle, and the flue gas in the air inlet 222 is guided towards the inner wall of the heat exchange cylinder 120.

[0033] The air inlet 222 designed above allows low-velocity flue gas to pass through and be guided to the inner wall of the heat exchange cylinder 120 under low load, achieving the effect of maximizing heat utilization. Specifically, the blade 220 is equipped with six oscillating blades, and the thickness of each oscillating blade increases from the center outwards.

[0034] With the above design, after the scraper 221 scrapes off the impurities on the inner wall of the heat exchange cylinder 120, the scraped impurities can be guided by the inclined surface of the vane. Specifically, the upper and lower parts on both sides of the recovery pipe 110 are connected to liquid pipes 130 that penetrate into the heat exchange cylinder 120. The two liquid pipes 130 are the inlet pipe and the outlet pipe, respectively.

[0035] When personnel need to utilize the thermal energy in the heat exchange cylinder 120, the liquid medium is first placed in the hollow part 121 of the heat exchange cylinder 120 through the liquid inlet pipe. Specifically, the interior of the heat exchange cylinder 120 is a hollow section 121, which is a liquid storage chamber; the inner side of the heat exchange cylinder 120 near the blades 220 is made of stainless steel.

[0036] After the liquid medium enters and fills the hollow part 121, the liquid will come into contact with the stainless steel lining of the heat exchange cylinder 120. The stainless steel lining is mainly used to absorb and conduct heat in the flue gas. Therefore, the heat will be transferred to the liquid, and the liquid can absorb the heat energy in the heat exchange cylinder 120 to achieve the effect of waste heat recovery and utilization.

[0037] The stainless steel liner designed above can effectively improve heat transfer efficiency. At the same time, stainless steel has good high-temperature oxidation resistance and corrosion resistance, which ensures that the heat exchange cylinder 120 can work stably for a long time under harsh working conditions and resist the chemical corrosion of flue gas and the physical wear of the scraper 221.

[0038] During operation, the high-temperature flue gas generated by the diesel engine is injected into the recovery pipe 110 through the flue gas pipe 100 and the pipe 210. Since the exhaust end of the pipe 210 is connected to the inclined intake pipe 211, the flue gas can directly enter the heat exchange cylinder 120 from the side at a certain angle. The high-speed flue gas will compress the blades 220 to rotate when it enters the heat exchange cylinder 120. The blades 220 can drive the scraper 221 to rotate in the heat exchange groove 122 of the heat exchange cylinder 120 to scrape off impurities in the heat exchange groove 122 and improve the heat conduction effect of the heat exchange cylinder 120. At the same time, the flue gas can naturally form a rotating vortex field along the inner wall of the heat exchange cylinder 120, which enhances the contact between the flue gas and the heat exchange cylinder 120. When the diesel engine is running at low load and the exhaust gas velocity is low, although the flue gas cannot drive the blades 220 to rotate, it can pass through the air port 222 and have full and uniform contact and collision with the heat exchange surface, thereby significantly improving the heat exchange efficiency under low operating conditions.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A waste heat recovery device for marine diesel engine exhaust, comprising a flue gas pipe (100), characterized in that: A recovery pipe (110) is provided above the flue gas pipe (100), and a heat exchange cylinder (120) is provided inside the recovery pipe (110). A guide assembly (200) is disposed within a heat exchange cylinder (120); The guide assembly (200) includes blades (220) disposed in the heat exchange cylinder (120) and an air inlet pipe (211) that is obliquely inserted into the recovery pipe (110) and extends through the heat exchange cylinder (120).

2. The waste heat recovery device for marine diesel engine exhaust as described in claim 1, characterized in that: The guiding component (200) also includes a pipe (210) connected to the outer end of the air inlet pipe (211). The lower end of the pipe (210) is connected to the flue gas pipe (100). The flue gas enters the heat exchange cylinder (120) of the recovery pipe (110) laterally through the pipe (210) and the air inlet pipe (211) to form a heat exchange operation.

3. The waste heat recovery device for marine diesel engine exhaust as described in claim 1, characterized in that: The outlet (222) of the air inlet pipe (211) is designed to be flat and narrow to increase the exhaust rate of flue gas.

4. The waste heat recovery device for marine diesel engine exhaust as described in claim 1, characterized in that: The inner wall of the heat exchange cylinder (120) is provided with a plurality of heat exchange grooves (122) in a linear array. The guide assembly (200) also includes a scraper (221) disposed in the heat exchange groove (122) and integrally connected to the edge of the blade (220). The scraper (221) is in a close fit with the inner arc of the heat exchange groove (122).

5. The waste heat recovery device for marine diesel engine exhaust as described in claim 4, characterized in that: The scraper (221) has an air inlet (222) in the middle, which is used to allow a small amount of flue gas to pass through.

6. The waste heat recovery device for marine diesel engine exhaust as described in claim 5, characterized in that: The air inlet (222) is opened at an angle, and the flue gas of the air inlet (222) is guided towards the inner wall of the heat exchange cylinder (120).

7. The waste heat recovery device for marine diesel engine exhaust as described in claim 1, characterized in that: The blade (220) is provided with six swing blades, and the thickness of each swing blade increases from the center to the outside.

8. The waste heat recovery device for marine diesel engine exhaust as described in claim 1, characterized in that: The interior of the heat exchange cylinder (120) is a hollow part (121), and the inner side of the heat exchange cylinder (120) near the blade (220) is made of stainless steel.

9. The waste heat recovery device for marine diesel engine exhaust as described in claim 1, characterized in that: The hollow part (121) of the heat exchange cylinder (120) is a liquid storage chamber.

10. The waste heat recovery device for marine diesel engine exhaust as described in claim 1, characterized in that: The upper and lower parts on both sides of the recovery pipe (110) are connected to liquid pipes (130) that penetrate into the heat exchange cylinder (120). The two liquid pipes (130) are the inlet pipe and the outlet pipe, respectively.

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