Marine fuel exhaust gas combined boiler

Abstract

This utility model discloses a marine fuel oil exhaust gas combined boiler, comprising a steam drum, a flue gas cylinder, and a water tank arranged sequentially from top to bottom. The flue gas cylinder contains a hot water exchange pipe, a combustion gas pipe, and an inner cylinder. The upper and lower ends of the inner cylinder are connected to the steam drum and the water tank, respectively, and are sealed to the top and bottom of the flue gas cylinder, forming a flue gas passage. The hot water exchange pipe is arranged around the flue gas passage, with its upper and lower ends connected to the steam drum and the water tank, respectively. The upper and lower ends of the combustion gas pipe extend into the steam drum and the water tank, respectively, and are connected to the fuel oil exhaust chamber and the furnace, respectively. The furnace is located below the flue gas cylinder and is surrounded by the water tank. A combustion port on one side of the furnace extends outward from the outer wall of the water tank, and a burner is located at the combustion port. The advantages of this utility model are: reduced boiler weight, increased fuel oil evaporation, reduced boiler volume, and effective prevention of corrosion.

Description

Technical Field

[0001] This utility model relates to the field of marine boiler technology. Background Technology

[0002] Marine fuel oil and exhaust gas combined boilers adopt a dual-energy operation mode of fuel oil and exhaust gas, which can make full use of the heat of high-temperature exhaust gas generated during ship operation, and has the advantages of flue gas purification, energy saving and environmental protection.

[0003] Traditional marine fuel oil exhaust gas combined boilers, see Figure 1 , Figure 2 As shown, its structure includes: a shell-side cylinder 1, with a water inlet on one side of the lower end of the shell-side cylinder 1, a steam outlet on the top of the shell-side cylinder 1, a high-temperature exhaust gas pipe 2 installed inside the shell-side cylinder 1, the bottom and top of the high-temperature exhaust gas pipe 2 being connected to the exhaust gas inlet chamber 3 and the exhaust gas outlet chamber 4 respectively, the exhaust gas inlet chamber 3 and the exhaust gas outlet chamber 4 being located at the bottom and top of the shell-side cylinder 1 respectively, and a combustion gas pipe 5 also installed inside the shell-side cylinder 1. The upper and lower ends are connected to the fuel oil flue gas discharge chamber 6 and the furnace 7, respectively. The combustion gas flue 5, the fuel oil flue gas discharge chamber 6, and the furnace 7 are all eccentrically positioned relative to the shell-side cylinder 1. The high-temperature exhaust gas flue 2 is arranged on one side of the combustion gas flue 5 and the furnace 7 within the shell-side cylinder 1. The fuel oil flue gas discharge chamber 6 and the furnace 7 are located at the top and bottom of the shell-side cylinder 1, respectively. A combustion port 71 is provided on the furnace 7, extending outward from the shell-side cylinder 1. A burner 8 is installed at the combustion port 71. When the marine fuel oil exhaust gas combined boiler is working, the water in the shell-side cylinder 1 exchanges heat with the high-temperature exhaust gas flue 2 and the combustion gas flue 5 to generate steam. The steam is discharged through the steam outlet at the top of the shell-side cylinder 1.

[0004] The aforementioned traditional marine fuel oil exhaust gas combined boiler has the following drawbacks: 1. The upper end of the high-temperature exhaust gas pipe 2 is connected to the exhaust gas outlet chamber 3 at the top of the shell-side cylinder 1. This places the upper end of the high-temperature exhaust gas pipe 2 above the water level inside the shell-side cylinder 1. This portion of the high-temperature exhaust gas pipe 2 above the water level cannot effectively exchange heat with the water inside the shell-side cylinder 1. On the one hand, the high-temperature exhaust gas pipe 2 above the water level cannot be cooled and remains at a high temperature for a long time, rendering its length ineffective. On the other hand, the high-temperature exhaust gas pipe 2 near and above the water level is prone to corrosion. All of these factors significantly shorten the service life of the marine fuel oil exhaust gas combined boiler. 2. The high-temperature exhaust gas pipe 2 is arranged on one side of the combustion gas pipe 5 and the furnace 7 inside the shell-side cylinder 1. This increases the space required for the arrangement of the high-temperature exhaust gas pipe 2, thereby increasing the diameter of the entire shell-side cylinder 1. This is very unfavorable for ships with limited installation space. 3. The overall operating weight of the boiler is large, which is not conducive to cargo transportation on ships. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a marine fuel oil exhaust gas combined boiler, which can effectively avoid corrosion, reduce boiler weight, and increase the evaporation of fuel oil.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows: a marine fuel oil exhaust gas combined boiler, comprising a steam drum, a flue gas cylinder, and a water tank arranged sequentially from top to bottom. A hot water exchange pipe, a combustion gas flue pipe, and an inner cylinder are vertically arranged inside the flue gas cylinder. The upper and lower ends of the inner cylinder are connected to the steam drum and the water tank, respectively, and are sealed to the top and bottom of the flue gas cylinder. An annular flue gas channel is formed between the flue gas cylinder and the inner cylinder. The hot water exchange pipe is arranged around the flue gas channel, and its upper and lower ends are connected to the steam drum and the water tank, respectively. The upper and lower ends of the combustion gas flue pipe extend into the steam drum and the water tank, respectively, and are connected to the fuel oil exhaust chamber and the furnace, respectively. The furnace is located below the flue gas cylinder, and its top and side walls are surrounded by the water tank. A combustion port is provided on one side of the furnace, extending outward from the outer wall of the water tank, and a burner is located at the combustion port.

[0007] Furthermore, in the aforementioned marine fuel oil exhaust gas combined boiler, an exhaust gas box is provided on one side of the flue gas cylinder. A baffle is provided inside the exhaust gas box, dividing the exhaust gas box into an independent exhaust gas inlet box and an exhaust gas outlet box. The exhaust gas inlet is located at the top of the exhaust gas inlet box, and the exhaust gas outlet is located at the top of the exhaust gas outlet box. A flue gas baffle mechanism is provided in the flue gas passage inside the exhaust gas box. The exhaust gas inlet box and the exhaust gas outlet box are located on both sides of the flue gas baffle mechanism. The flue gas baffle mechanism causes the high-temperature exhaust gas entering the flue gas passage to flow from the side of the exhaust gas inlet box around the flue gas cylinder towards the exhaust gas outlet box.

[0008] Furthermore, in the aforementioned marine fuel oil exhaust gas combined boiler, the structure of the flue gas baffle mechanism includes: several baffles, all of which are arranged radially along the flue gas cylinder, and the baffles are sequentially welded, fixed, and sealed between the inner wall of the flue gas cylinder and the hot water exchange pipe, between adjacent hot water exchange pipes, and between the hot water exchange pipe and the inner cylinder.

[0009] Furthermore, in the aforementioned marine fuel oil exhaust gas combined boiler, several baffles are fixedly installed in the flue gas passage, each baffle being fixedly installed on the outer wall of the inner cylinder, and the baffles are arranged at intervals around the outer wall of the inner cylinder.

[0010] Furthermore, in the aforementioned marine fuel oil exhaust gas combined boiler, each baffle is made of equilateral angle steel profiles, with the corners of the equilateral angle steel profiles facing the inner wall of the flue gas cylinder.

[0011] Furthermore, in the aforementioned marine fuel oil exhaust gas combined boiler, a fire observation tube is installed on the furnace, which extends outward through the water tank.

[0012] Furthermore, in the aforementioned marine fuel oil exhaust gas combined boiler, a chimney with a gradually decreasing diameter from bottom to top is connected to the fuel oil flue gas outlet extending from the top of the steam drum.

[0013] The advantages of this utility model are as follows: 1. This application provides a marine fuel oil exhaust gas combined boiler, which has the following advantages: 1. The boiler is divided into a steam drum and a water drum. Compared with traditional marine fuel oil exhaust gas combined boilers, the water volume is reduced, greatly reducing the weight of the entire boiler, thereby effectively increasing the weight of cargo transported by the ship. 2. Only the furnace is arranged in the water drum, increasing the furnace capacity and thus effectively increasing the evaporation of the fuel oil portion. 3. The hot water exchange pipes are arranged around the combustion gas flue, increasing the area available for installation, thus effectively shortening the boiler diameter and reducing the boiler size, which is more suitable for ships with limited installation space. 4. The hot water exchange pipes that exchange heat with the high-temperature exhaust gas are all located inside the flue gas stack, avoiding ineffective length. This not only saves equipment costs, but also effectively prevents corrosion, thereby greatly extending the service life of the boiler. 5. The structure is simple and ingenious, and easy to process and manufacture. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a conventional marine fuel oil exhaust gas combined boiler as described in the background art.

[0015] Figure 2 This is a schematic diagram of the arrangement of high-temperature exhaust gas pipes and combustion gas pipes in a conventional marine fuel oil exhaust gas combined boiler as described in the background art.

[0016] Figure 3 This is a three-dimensional structural diagram of a marine fuel oil exhaust gas combined boiler according to the present invention.

[0017] Figure 4 This is a schematic diagram of the internal structure of a marine fuel oil exhaust gas combined boiler as described in this utility model, shown in a cross section.

[0018] Figure 5 This is a longitudinal sectional view of the internal structure of a marine fuel oil exhaust gas combined boiler according to this utility model. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments.

[0020] like Figure 3 , Figure 4 , Figure 5As shown, a marine fuel oil exhaust gas combined boiler includes a steam drum 1, a flue gas cylinder 2, and a water drum 3 arranged sequentially from top to bottom. A hot water exchange pipe 4, a combustion gas flue pipe 5, and an inner cylinder 10 are vertically arranged inside the flue gas cylinder 2. The upper and lower ends of the inner cylinder 10 are connected to the steam drum 1 and the water drum 3, respectively, and are sealed to the top and bottom of the flue gas cylinder. An annular flue gas channel 20 is formed between the flue gas cylinder 2 and the inner cylinder 10, and the hot water exchange pipe 4 is arranged around the flue gas channel 20. The upper and lower ends of the hot water exchange pipe 4 are connected to the steam drum 1 and the water drum 3, respectively. The upper and lower ends of the combustion gas flue pipe 5 extend into the steam drum 1 and the water drum 3, respectively, and are connected to the fuel oil exhaust gas discharge chamber 6 and the furnace 7, respectively. The furnace 7 is located below the flue gas cylinder 2, and its top and side walls are surrounded by the water drum 3. A combustion port 71 is provided on one side of the furnace 7, extending outward from the outer wall of the water tank 3. A burner 72 is located at the combustion port 71. To facilitate observation of the combustion within the furnace 7, an observation tube 73 is provided on the furnace 7 in this embodiment, extending outward through the water tank 3. A steam output pipe is also provided on the steam drum 1, and a water inlet pipe is connected to the water tank 3.

[0021] The fuel oil exhaust chamber 6 is located inside the steam drum 1. A fuel oil exhaust outlet 61 is located at the top of the fuel oil exhaust chamber 6, extending beyond the top of the steam drum 1. A chimney 62, with its diameter gradually decreasing from bottom to top, is connected to the fuel oil exhaust outlet 61 extending beyond the top of the steam drum 1. The exhaust gas cylinder 2 is connected to the exhaust gas inlet 821 and the exhaust gas outlet 831.

[0022] Specifically, an exhaust gas chamber 8 is provided on one side of the flue gas cylinder 2. A partition 81 is installed inside the exhaust gas chamber 8, dividing it into an independent exhaust gas inlet chamber 82 and an exhaust gas outlet chamber 83. An exhaust gas inlet 821 is located at the top of the exhaust gas inlet chamber 82, and an exhaust gas outlet 831 is located at the top of the exhaust gas outlet chamber 83. A flue gas baffle mechanism 9 is installed within the flue gas passage 20 inside the exhaust gas chamber 8. The exhaust gas inlet chamber 82 and the exhaust gas outlet chamber 83 are located on opposite sides of the baffle mechanism 9. The baffle mechanism 9 causes the high-temperature exhaust gas entering the flue gas cylinder 2 to flow from the exhaust gas inlet chamber 82, around the flue gas passage 20, towards the exhaust gas outlet chamber 83.

[0023] In this embodiment, the flue gas baffle mechanism 9 includes several baffles 91. All baffles 91 are arranged radially along the flue gas cylinder 2. The baffles 91 are sequentially welded and fixedly sealed between the inner wall of the flue gas cylinder 2 and the hot water exchange pipe 4, between adjacent hot water exchange pipes 4, and between the hot water exchange pipe 4 and the outer wall of the inner cylinder 10. The flue gas baffle mechanism 9 effectively prevents the high-temperature flue gas entering the flue gas cylinder 2 from directly entering the exhaust gas outlet smoke box 83 and forming a short circuit, ensuring sufficient heat exchange between the high-temperature exhaust gas and the hot water exchange pipe 4.

[0024] In addition, several baffles 21 are fixedly installed inside the flue gas passage 20. Each baffle 21 is fixedly installed on the outer wall of the inner cylinder 10, and the baffles 21 are arranged at intervals around the outer wall of the inner cylinder 10. Each baffle 21 is made of equilateral angle steel profile, with the angle of the equilateral angle steel profile facing the inner wall of the flue gas cylinder 2. The baffles 21 can increase the flow velocity of the high-temperature exhaust gas in the flue gas passage 20 and prevent the flow velocity of the high-temperature exhaust gas from slowing down during the process of circulating.

[0025] The working principle is as follows: High-temperature exhaust gas enters the flue gas passage 20 sequentially through exhaust gas inlet 821 and exhaust gas inlet smoke box 82. Then, in the flue gas passage 20, it runs from the side of exhaust gas inlet smoke box 82 to the side of exhaust gas outlet smoke box 83 and enters the exhaust gas outlet smoke box 83, and then is discharged from exhaust gas outlet 831. During the operation of the high-temperature exhaust gas, it fully exchanges heat with the hot water exchange pipe 4.

[0026] Fuel oil is injected into the furnace 7 through burner 72 and burned. The high-temperature gas generated by combustion moves upward and enters the combustion gas flue pipe 5. The gas that has released heat in the combustion gas flue pipe 5 is discharged into the fuel oil flue gas discharge chamber 6, and then discharged through the fuel oil flue gas discharge outlet 61 and the chimney 62.

[0027] The water in water tank 3 exchanges heat with the furnace 7 and the combustion gas flue 5, causing its temperature to rise. The heated water then enters the heat exchanger pipe 4 and the inner cylinder 10. The water in heat exchanger pipe 4 exchanges heat with the high-temperature exhaust gas to form a steam-water mixture, and the water in inner cylinder 10 exchanges heat with the combustion gas flue 5 to form another steam-water mixture. The steam-water mixture from heat exchanger pipe 4 and inner cylinder 10 then enters the steam drum 1. Steam is generated in the steam drum 1 and output externally.

[0028] As can be seen from the above, this application provides a marine fuel oil exhaust gas combined boiler, which has the following advantages: 1. Compared with traditional marine fuel oil exhaust gas combined boilers, the boiler is divided into a steam drum 1 and a water drum 3, reducing the water volume and significantly reducing the overall weight of the boiler, thereby effectively increasing the weight of cargo transported by the ship. 2. Only the furnace 7 is arranged in the water drum, increasing the capacity of the furnace 7 and thus effectively increasing the evaporation rate of the fuel oil portion. 3. The heat exchanger pipes 4 are arranged around the combustion gas flue pipes 5, increasing the area available for installation and thus effectively shortening the boiler diameter, thereby reducing the boiler size, which is more suitable for ships with limited installation space. 4. The heat exchanger pipes 4, which exchange heat with the high-temperature exhaust gas, are all located inside the flue gas cylinder 2, avoiding ineffective length. This not only saves equipment costs but, more importantly, effectively prevents corrosion, thereby greatly extending the service life of the boiler. 5. The structure is simple, ingenious, and easy to process and manufacture.

Claims

1. A marine fuel oil exhaust gas combined boiler, characterized in that: The system comprises, from top to bottom, a steam drum, a flue gas cylinder, and a water tank. The flue gas cylinder contains a vertically arranged hot water exchange pipe, a combustion gas flue pipe, and an inner cylinder. The upper and lower ends of the inner cylinder are connected to the steam drum and the water tank, respectively, and are sealed to the top and bottom of the flue gas cylinder. An annular flue gas channel is formed between the flue gas cylinder and the inner cylinder. The hot water exchange pipe is arranged around the flue gas channel, with its upper and lower ends connected to the steam drum and the water tank, respectively. The upper and lower ends of the combustion gas flue pipe extend into the steam drum and the water tank, respectively, and are connected to the fuel oil flue gas discharge chamber and the furnace, respectively. The furnace is located below the flue gas cylinder, and its top and side walls are surrounded by the water tank. A combustion port is located on one side of the furnace, extending outwards from the outer wall of the water tank, and a burner is located at the combustion port.

2. A marine fuel oil exhaust gas combined boiler according to claim 1, characterized in that: An exhaust gas box is installed on one side of the flue gas cylinder. Inside the exhaust gas box, a partition is installed, which divides the exhaust gas box into an independent exhaust gas inlet box and an exhaust gas outlet box. The exhaust gas inlet is located at the top of the exhaust gas inlet box, and the exhaust gas outlet is located at the top of the exhaust gas outlet box. A flue gas baffle mechanism is installed in the flue gas passage inside the exhaust gas box. The exhaust gas inlet box and the exhaust gas outlet box are located on both sides of the flue gas baffle mechanism. The flue gas baffle mechanism causes the high-temperature exhaust gas entering the flue gas passage to flow from the side of the exhaust gas inlet box around the flue gas cylinder towards the exhaust gas outlet box.

3. A marine fuel oil exhaust gas combined boiler according to claim 2, characterized in that: The structure of the flue gas baffle mechanism includes: several baffles, all of which are arranged radially along the flue gas cylinder. The baffles are sequentially welded, fixed, and sealed between the inner wall of the flue gas cylinder and the hot water exchange pipe, between adjacent hot water exchange pipes, and between the hot water exchange pipe and the inner cylinder.

4. A marine fuel oil exhaust gas combined boiler according to claim 2, characterized in that: Several baffles are fixedly installed inside the flue gas passage. Each baffle is fixedly installed on the outer wall of the inner cylinder, and the baffles are arranged at intervals around the outer wall of the inner cylinder.

5. A marine fuel oil exhaust gas combined boiler according to claim 4, characterized in that: Each spoiler is made of equilateral angle steel profiles, with the corners of the equilateral angle steel profiles facing the inner wall of the flue gas cylinder.

6. A marine fuel oil exhaust gas combined boiler according to claim 1, characterized in that: A fire observation tube is installed on the furnace, which extends outward through the water tank.

7. A marine fuel oil exhaust gas combined boiler according to claim 1, characterized in that: A chimney with a gradually decreasing diameter from bottom to top is connected to the fuel gas exhaust outlet extending from the top of the steam drum.

Images