Coal-fired power plant flue gas waste heat recovery device

Abstract

This utility model discloses a waste heat recovery device for flue gas from a coal-fired power plant, belonging to the technical field of waste heat recovery in coal-fired power plants. It includes a first waste heat recovery structure, a second waste heat recovery structure, and an inlet pipe. A valve is installed on the outer surface of the inlet pipe. The second waste heat recovery structure includes a water storage tank. A temperature sensor is installed on the inner bottom wall of the water storage tank, and a display screen is installed on the upper surface. The annular heat-conducting fins on the inner wall of the heat-conducting pipe increase the contact area with the flue gas, and the S-shaped air vents inside the water storage tank extend the residence time of the flue gas, thus enhancing the heat exchange effect and fully utilizing the waste heat from the flue gas. The combination of the temperature sensor and the display screen allows for real-time monitoring of the water temperature in the storage tank, facilitating the understanding of the waste heat recovery status. The outlet pipe and control valve facilitate the use of hot water, meeting practical application needs, and the sealing plug ensures the water storage tank's airtightness.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology in coal-fired power plants, specifically a waste heat recovery device for flue gas from coal-fired power plants. Background Technology

[0002] A thermal power plant, or coal-fired power plant for short, is a factory that uses combustible materials as fuel to produce electricity. Its basic production process is as follows: fuel burns to heat water and generate steam, converting the chemical energy of the fuel into heat energy. The steam pressure drives a turbine to rotate, converting the heat energy into mechanical energy. The turbine then drives a generator to rotate, converting the mechanical energy into electrical energy. The prime mover is usually a steam engine or a gas turbine; in some smaller power plants, an internal combustion engine may also be used. They all generate electricity by utilizing the pressure drop during the process of high-temperature, high-pressure steam or gas being converted into low-pressure air or condensate through a turbine. In my country, coal-fired power generation plays a crucial role in the electricity supply.

[0003] However, during the production process of coal-fired power plants, a large amount of heat is wasted with the emission of flue gas, which not only causes energy loss but also causes thermal pollution to the environment. Flue gas loss has become an extremely important heat loss in boiler operation. Therefore, those skilled in the art have provided a waste heat recovery device for flue gas from coal-fired power plants to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery device for flue gas from coal-fired power plants to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A waste heat recovery device for flue gas from a coal-fired power plant includes a first waste heat recovery structure for flue gas from a coal-fired power plant, a second waste heat recovery structure for flue gas from a coal-fired power plant, and an air inlet pipe. A valve is installed on the outer surface of the air inlet pipe. The second waste heat recovery structure for flue gas from a coal-fired power plant includes a water storage tank. A temperature sensor is installed on the inner bottom wall of the water storage tank, and a display screen is installed on the upper surface of the water storage tank.

[0007] As a further embodiment of this utility model: the first thermal coal-fired power plant flue gas waste heat recovery structure includes a heat-conducting pipe, and two connecting rods are connected to the outer surface of the heat-conducting pipe.

[0008] As a further improvement of this utility model: one end of each of the two connecting rods is connected to a connecting plate, and two mounting holes are opened on the back of each of the two connecting plates, and a mounting screw is provided inside each mounting hole.

[0009] As a further improvement of this utility model: the inner wall of the heat pipe is connected with annularly arranged heat-conducting fins, and the side of each group of heat-conducting fins that is close to each other is connected to the air inlet pipe.

[0010] As a further improvement of this utility model: the bottom surface of the water storage tank is connected to a ring of supporting legs, and the outer surface of each supporting leg is connected to a base.

[0011] As a further improvement of this utility model: the upper surface of the water storage tank is provided with a water inlet, and the inside of the water inlet is provided with a sealing plug.

[0012] As a further improvement of this utility model: the inner wall of the water storage tank is provided with an S-shaped air guide hole, one end of the air inlet pipe is connected to the S-shaped air guide hole, and the outer surface of the water storage tank is connected to an air outlet pipe.

[0013] As a further improvement of this utility model: the bottom surface of the water storage tank is connected to a water outlet pipe, and a control valve is installed on the outer surface of the water outlet pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This waste heat recovery device for coal-fired power plants expands the contact area with flue gas through annular heat-conducting fins on the inner wall of the heat-conducting pipe, and extends the residence time of flue gas with S-shaped air guide holes in the water storage tank. This dual effect enhances the heat exchange efficiency and makes full use of the waste heat of the flue gas. The combination of temperature sensors and display screens allows for real-time monitoring of the water temperature in the storage tank, facilitating the understanding of the waste heat recovery status. The installation of water outlet pipes and control valves facilitates the use of hot water to meet actual needs. Sealing plugs ensure the water tank's airtightness, and valves control the flue gas flow rate, improving the controllability and safety of the device's operation. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of a waste heat recovery device for flue gas from a coal-fired power plant;

[0017] Figure 2 A side view of a waste heat recovery device for flue gas from a coal-fired power plant;

[0018] Figure 3 A side sectional view of a waste heat recovery device for flue gas from a coal-fired power plant;

[0019] Figure 4 A front sectional view of a waste heat recovery device for flue gas from a coal-fired power plant;

[0020] Figure 5 In a waste heat recovery device for flue gas from a coal-fired power plant Figure 3 A magnified structural diagram of part A in the middle.

[0021] In the diagram: 1. Waste heat recovery structure of flue gas from the first coal-fired power plant; 101. Heat pipe; 102. Heat-conducting fins; 103. Connecting rod; 104. Connecting plate; 105. Mounting hole; 106. Mounting screw; 2. Waste heat recovery structure of flue gas from the second coal-fired power plant; 201. Water storage tank; 202. Water inlet; 203. Sealing plug; 204. S-shaped air vent; 205. Temperature sensor; 206. Display screen; 207. Water outlet pipe; 208. Control valve; 209. Air outlet pipe; 3. Air inlet pipe; 4. Valve; 5. Support leg; 6. Base. Detailed Implementation

[0022] Please see Figures 1-5 In this embodiment of the utility model, a waste heat recovery device for flue gas from a coal-fired power plant includes a first waste heat recovery structure 1, a second waste heat recovery structure 2, and an air inlet pipe 3. A valve 4 is installed on the outer surface of the air inlet pipe 3. The second waste heat recovery structure 2 includes a water storage tank 201. A temperature sensor 205 is installed on the inner bottom wall of the water storage tank 201, and a display screen 206 is installed on the upper surface of the water storage tank 201. The contact area with the flue gas is expanded by the annular heat-conducting fins 102 on the inner wall of the heat-conducting pipe 101, and the residence time of the flue gas is extended by the S-shaped air guide hole 204 in the water storage tank 201. The dual effect improves the heat exchange effect and makes full use of the waste heat of the flue gas.

[0023] The first thermal coal-fired power plant flue gas waste heat recovery structure 1 includes a heat-conducting pipe 101. Two connecting rods 103 are connected to the outer surface of the heat-conducting pipe 101. One end of each connecting rod 103 is connected to a connecting plate 104. Two mounting holes 105 are opened on the back of each connecting plate 104. Each mounting hole 105 is equipped with a mounting screw 106. The inner wall of the heat-conducting pipe 101 is connected to annularly arranged heat-conducting fins 102. The side of each group of heat-conducting fins 102 that is close to each other is connected to the air inlet pipe 3. This not only makes the heat conduction effect of the heat-conducting pipe 101 better, but also makes the waste heat recovery effect of the equipment better.

[0024] The bottom surface of the water storage tank 201 is connected to a ring of supporting legs 5. Each supporting leg 5 has a base 6 connected to its outer surface to support the equipment. The upper surface of the water storage tank 201 has a water inlet 202. The inside of the water inlet 202 is equipped with a sealing plug 203 to prevent external impurities from entering the interior of the water storage tank 201. The inner wall of the water storage tank 201 has an S-shaped air guide hole 204. One end of the air inlet pipe 3 is connected to the S-shaped air guide hole 204. The outer surface of the water storage tank 201 is connected to an air outlet pipe 209. The bottom surface of the water storage tank 201 is connected to a water outlet pipe 207. A control valve 208 is installed on the outer surface of the water outlet pipe 207 to allow the flue gas to remain in the water storage tank 201 for a longer time, thereby increasing the waste heat recovery efficiency of the equipment.

[0025] The working principle of this invention is as follows: First, flue gas is introduced through the air inlet pipe 3, and the air intake is controlled by the valve 4. As the flue gas flows within the air inlet pipe 3, heat is transferred to the outer heat-conducting fins 102, and then conducted through the heat-conducting pipe 101, achieving initial waste heat recovery. Simultaneously, the flue gas enters the water storage tank 201 through the S-shaped air guide hole 204, where it fully exchanges heat with the water inside, further recovering waste heat. The temperature sensor 205 monitors the water temperature in real time and displays the temperature on the display screen 206. The heat-exchanged flue gas is discharged through the air outlet pipe 209, and hot water can be discharged through the water outlet pipe 207, regulated by the control valve 208.

[0026] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalent elements of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A waste heat recovery device for flue gas from a coal-fired power plant, characterized in that, The structure includes a first thermal coal-fired power plant flue gas waste heat recovery structure (1), a second thermal coal-fired power plant flue gas waste heat recovery structure (2), and an air inlet pipe (3). A valve (4) is installed on the outer surface of the air inlet pipe (3). The second thermal coal-fired power plant flue gas waste heat recovery structure (2) includes a water storage tank (201). A temperature sensor (205) is installed on the inner bottom wall of the water storage tank (201), and a display screen (206) is installed on the upper surface of the water storage tank (201).

2. The waste heat recovery device for flue gas from a coal-fired power plant according to claim 1, characterized in that, The first thermal coal-fired power plant flue gas waste heat recovery structure (1) includes a heat-conducting pipe (101), and two connecting rods (103) are connected to the outer surface of the heat-conducting pipe (101).

3. The waste heat recovery device for flue gas from a coal-fired power plant according to claim 2, characterized in that, One end of each of the two connecting rods (103) is connected to a connecting plate (104), and two mounting holes (105) are opened on the back of each of the two connecting plates (104), and each mounting hole (105) is provided with a mounting screw (106).

4. The waste heat recovery device for flue gas from a coal-fired power plant according to claim 2, characterized in that, The inner wall of the heat pipe (101) is connected to annularly arranged heat-conducting fins (102), and the side of each group of heat-conducting fins (102) that is close to each other is connected to the air inlet pipe (3).

5. The waste heat recovery device for flue gas from a coal-fired power plant according to claim 1, characterized in that, The bottom surface of the water storage tank (201) is connected to a ring of supporting legs (5), and the outer surface of each supporting leg (5) is connected to a base (6).

6. The waste heat recovery device for flue gas from a coal-fired power plant according to claim 1, characterized in that, The water storage tank (201) has an inlet (202) on its upper surface, and a sealing plug (203) is provided inside the inlet (202).

7. The waste heat recovery device for flue gas from a coal-fired power plant according to claim 1, characterized in that, The inner wall of the water storage tank (201) is provided with an S-shaped air guide hole (204), one end of the air inlet pipe (3) is connected to the S-shaped air guide hole (204), and the outer surface of the water storage tank (201) is connected to an air outlet pipe (209).

8. A waste heat recovery device for flue gas from a coal-fired power plant according to claim 1, characterized in that, The bottom surface of the water storage tank (201) is connected to a water outlet pipe (207), and a control valve (208) is installed on the outer surface of the water outlet pipe (207).

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