Tail gas waste heat recovery device of fuel oil gas hot blast stove

Abstract

The utility model relates to the field of tail gas waste heat recovery, in particular to a fuel oil gas hot blast stove tail gas waste heat recovery device which comprises a water tank, gas tanks, a U-shaped gas guide pipe, a partition plate, an upper spoiler and a lower spoiler, the partition plate is installed in the middle inside the water tank, the gas tanks of the same specification are installed on the upper side and the lower side of the partition plate, and the gas tanks on the upper portion and the lower portion are communicated through the U-shaped gas guide pipe. The upper spoilers and the lower spoilers are arranged between the side walls of the upper side and the lower side in the water tank and the partition plates in a staggered and equally-spaced mode, and the U-shaped gas guide pipes are compactly arranged side by side, so that the gas guide amount is increased, and the gas guide amount is remarkably increased within the same time; the U-shaped structure is adopted, so that the heat exchange efficiency of hot air flow and cooling water on the outer side in the pipe is improved, the flowing distance is shortened, the flowing resistance is reduced, and the heat conduction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas waste heat recovery, specifically to an exhaust gas waste heat recovery device for an oil-fired hot air furnace. Background Technology

[0002] Waste heat recovery devices for oil and gas hot blast stoves typically use heat exchangers as their core components. Their working principle involves transferring heat from the exhaust gas emitted by the hot blast stove to the medium requiring heating, such as water or air, thereby achieving heat recovery and reuse. This type of device can significantly improve energy efficiency, reduce energy consumption, and lower operating costs. A Chinese patent (authorization announcement number CN 220039211 U) discloses a waste heat recovery device for oil and gas hot blast stove exhaust gas. This patented technology employs a water tank, a first heat exchange tube, and a second heat exchange tube. The first heat exchange tube is a spiral tube located in the water tank, and the second heat exchange tube is a serpentine tube located inside the first heat exchange tube. The high-temperature exhaust gas from the oil and gas hot blast stove enters the gas delivery pipe through an induced draft fan and exits from the outlet. After heat exchange with the water in the water tank, the water is heated, increasing its temperature. The water absorbs the high temperature of the exhaust gas while simultaneously washing away impurities. The heated water is then transferred to the first and second heat exchange tubes for further heating. Domestic hot water is circulated inside the first heat exchange tube. After heating, hot water is supplied to the living area. The second heat exchanger pipe introduces outside air, which, after heating, preheats the outside air entering the oil / gas hot air furnace, reducing heat loss. This device uses a water tank for direct water washing and impurity removal, and indirectly heats the domestic water and preheats the incoming air. It fully utilizes the waste heat from the hot air furnace's exhaust gas, reducing energy consumption and providing multiple functions. Furthermore, its simple structure and convenient implementation make it suitable for widespread use. However, this design connects the inlet and outlet pipes into a single pipeline, resulting in a limited number of pipes, low conversion efficiency, and long processing time. Therefore, those skilled in the art have provided a waste heat recovery device for oil / gas hot air furnace exhaust gas to solve the problems mentioned in the background art. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a waste heat recovery device for fuel gas hot air furnace tail gas, including a water tank, a gas box, a U-shaped air guide pipe, a baffle plate, an upper baffle plate and a lower baffle plate. The baffle plate is installed in the middle of the water tank. Gas boxes of the same specification are installed on both the upper and lower sides of the baffle plate. The upper and lower gas boxes are connected by a U-shaped air guide pipe and multiple U-shaped air guide pipes are installed. The upper and lower baffle plates are installed alternately and at equal intervals on the upper and lower side walls of the water tank and the baffle plate.

[0004] Preferably, the water tank has an inlet pipe on the upper side and an outlet pipe on the lower side, and a heat exchange area is provided between the inside of the water tank and the U-shaped air guide pipe;

[0005] Preferably, the bottom of the lower baffle plate is provided with multiple flow guide ports;

[0006] Preferably, an air inlet pipe is installed on the upper side of the air box, an air outlet pipe is installed on the lower side of the air box, a fixing sleeve is installed on the side wall of the air box, a U-shaped air guide pipe is sealed and fixed inside the fixing sleeve, a fixing protrusion is installed at the bottom of the air box, the fixing protrusion is fixedly installed in the fixing groove, and the fixing groove is located in the upper and lower side walls of the left end of the partition.

[0007] The technical effects and advantages of this utility model are as follows:

[0008] 1. The design incorporates multiple U-shaped air guide pipes installed in parallel and compactly, which increases the air volume and significantly improves the air volume within the same time period. The U-shaped structure improves the efficiency of heat exchange between the hot airflow and the cooling water on the outside of the pipe, shortens the flow distance, reduces flow resistance, and improves heat transfer efficiency.

[0009] 2. During the heat exchange process, the thermodynamic stratification effect caused by the density difference between hot and cold water is utilized. At this time, cold water will form the lower layer and be discharged through the guide port at the bottom of the lower baffle plate. This causes the fluid at the bottom to form turbulence during the flow process, which enhances the heat exchange effect between the fluid and the wall of the U-shaped air guide pipe. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a waste heat recovery device for fuel oil / gas hot blast stove tail gas provided in an embodiment of this application. Figure 1 ;

[0011] Figure 2 This is a cross-sectional structural schematic diagram of a waste heat recovery device for fuel oil and gas hot air furnace tail gas provided in an embodiment of this application;

[0012] Figure 3 This application provides an embodiment of a waste heat recovery device for fuel oil / gas hot blast stove tail gas. Figure 2 A schematic diagram of structure A;

[0013] Figure 4 This is a schematic diagram of the structure of a waste heat recovery device for fuel oil / gas hot blast stove tail gas provided in an embodiment of this application. Figure 2 ;

[0014] Figure 5 This application provides an embodiment of a waste heat recovery device for fuel oil / gas hot blast stove tail gas. Figure 4 A schematic diagram of the B structure;

[0015] Figure 6 This is a partial structural schematic diagram of a waste heat recovery device for fuel oil and gas hot air furnace tail gas provided in an embodiment of this application.

[0016] In the diagram: 1. Water tank; 2. Air tank; 3. U-shaped air guide pipe; 4. Baffle plate; 101. Air inlet pipe; 102. Water inlet pipe; 103. Air outlet pipe; 104. Water outlet pipe; 105. Upper baffle plate; 106. Lower baffle plate; 107. Flow guide port; 108. Heat exchange area; 201. Fixing sleeve; 202. Fixing protrusion; 401. Fixing groove. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose. Example

[0018] Please see Figures 1-6 In this embodiment, a waste heat recovery device for fuel gas hot air furnace tail gas is provided, including a water tank 1, a gas box 2, a U-shaped air guide pipe 3, a partition 4, an upper baffle 105 and a lower baffle 106. The partition 4 is installed in the middle of the water tank 1. The same specification gas boxes 2 are installed on both the upper and lower sides of the partition 4. The upper and lower gas boxes 2 are connected by the U-shaped air guide pipe 3 and multiple U-shaped air guide pipes 3 are installed. The upper and lower side walls of the water tank 1 are staggered with the partition 4 and the upper baffle 105 and the lower baffle 106 are installed at equal intervals.

[0019] Specifically, the water tank 1 has an upper inlet pipe 102 and an outlet pipe 104 installed on the lower side. A heat exchange area 108 is provided between the inside of the water tank 1 and the U-shaped air guide pipe 3. The bottom of the lower baffle plate 106 has multiple guide ports 107. The air tank 2 has an upper inlet pipe 101 and an outlet pipe 103 installed on the lower side. A fixing sleeve 201 is installed on the side wall of the air tank 2. The U-shaped air guide pipe 3 is sealed and fixed inside the fixing sleeve 201. A fixing protrusion 202 is installed at the bottom of the air tank 2. The fixing protrusion 202 is fixedly installed in the fixing groove 401. The fixing groove 401 is located in the upper and lower side walls of the left end of the partition plate 4.

[0020] The working principle of this utility model is as follows:

[0021] In a waste heat recovery device using the tail gas of an oil / gas hot air furnace, multiple U-shaped air guide pipes 3 are designed and installed in a compact parallel configuration. This increases the air guide volume significantly within a given time. The U-shaped structure improves the efficiency of heat exchange between the hot airflow and the cooling water on the outside of the pipes, shortens the flow distance, reduces flow resistance, and enhances heat transfer efficiency. During heat exchange, the thermodynamic stratification effect caused by the density difference between hot and cold water is utilized. Cold water forms a lower layer and is discharged through the guide port 107 at the bottom of the lower baffle plate 106. This creates turbulence in the fluid at the bottom, enhancing the heat exchange effect between the fluid and the wall of the U-shaped air guide pipes 3.

[0022] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A waste heat recovery device for exhaust gas from an oil / gas-fired hot air furnace, characterized in that, It includes a water tank (1), an air tank (2), a U-shaped air pipe (3), a partition (4), an upper baffle plate (105), and a lower baffle plate (106). The partition plate (4) is installed in the middle of the water tank (1). The air tank (2) of the same specification is installed on both the upper and lower sides of the partition plate (4). The upper and lower air tanks (2) are connected by a U-shaped air pipe (3), and multiple U-shaped air pipes (3) are installed. The upper and lower side walls of the water tank (1) are staggered and equally spaced with the partition plate (4) to install the upper baffle plate (105) and the lower baffle plate (106).

2. The waste heat recovery device for fuel oil / gas hot air furnace tail gas according to claim 1, characterized in that, The water tank (1) has an inlet pipe (102) on the upper side and an outlet pipe (104) on the lower side.

3. The waste heat recovery device for fuel oil / gas hot air furnace tail gas according to claim 2, characterized in that, A heat exchange area (108) is provided between the inside of the water tank (1) and the U-shaped air pipe (3).

4. The waste heat recovery device for fuel oil / gas hot air furnace tail gas according to claim 1, characterized in that, The bottom of the lower baffle plate (106) is provided with multiple flow guide ports (107).

5. The waste heat recovery device for fuel oil / gas hot air furnace tail gas according to claim 1, characterized in that, An air inlet pipe (101) is installed on the upper side of the air box (2), and an air outlet pipe (103) is installed on the lower side of the air box (2).

6. The waste heat recovery device for fuel oil / gas hot air furnace tail gas according to claim 5, characterized in that, A fixing sleeve (201) is installed on the side wall of the air box (2), and a U-shaped air guide pipe (3) is sealed and fixed inside the fixing sleeve (201).

7. The waste heat recovery device for fuel oil / gas hot air furnace tail gas according to claim 6, characterized in that, The bottom of the air box (2) is fitted with a fixing protrusion (202), which is fixedly installed in the fixing groove (401). The fixing groove (401) is located on the upper and lower side walls of the left end of the partition (4).

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