Thermal power plant boiler flue gas waste heat energy-saving device

Abstract

The invention discloses a thermal power plant boiler flue gas waste heat energy-saving device, which belongs to the technical field of flue gas waste heat recycling, and comprises a fixing frame, a plurality of heating tanks, an annular thermal insulation pipe, a plurality of flue pipes and a drainage buffer tank, a water inlet and a water outlet are respectively formed in the upper end and the lower end of each heating tank, the drainage buffer tank is arranged below the plurality of heating tanks, and the drainage buffer tank is communicated with the plurality of water outlets of the plurality of heating tanks; smoke generated by combustion of the boiler enters the annular heat preservation pipe from the smoke inlet and is divided into the multiple flue pipes from the annular heat preservation pipe, the multiple flue pipes heat water in the multiple heating tanks correspondingly, and the heated water is intensively discharged into the drainage buffer tank from the water outlet and then discharged from the drainage outlet. Therefore, hot water is utilized, good recycling of smoke preheating is achieved, and the effects of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas waste heat recovery and utilization, and in particular relates to a flue gas waste heat energy-saving device for a thermal power plant boiler. Background Art

[0002] The main function of a thermal power plant boiler is to transfer the heat energy released by the combustion of fuel to the working fluid, heating the water into high-temperature and high-pressure steam.

[0003] At present, there is still excess heat in the flue gas from boiler combustion, which would cause a waste of heat energy if it is directly discharged into the air. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and to propose a thermal power plant boiler flue gas waste heat energy saving device.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a thermal power plant boiler flue gas waste heat energy-saving device, which includes a fixed frame, a plurality of heating tanks, an annular insulation pipe, a plurality of flue pipes and a drainage buffer tank, the plurality of heating tanks are installed on the fixed frame, the upper end and the lower end of the heating tank are respectively provided with a water inlet and a water outlet, the drainage buffer tank is arranged below the plurality of heating tanks, and the drainage buffer tank is connected to the plurality of water outlets of the plurality of heating tanks, the lower end of the drainage buffer tank is provided with a drain port, the plurality of flue pipes respectively pass through the plurality of heating tanks, the annular insulation pipe is provided with a smoke inlet, and the annular insulation pipe is connected to the ends of the plurality of flue pipes.

[0006] As a further description of the above technical solution:

[0007] The plurality of heating tanks are arranged in a circular array.

[0008] As a further description of the above technical solution:

[0009] The flue pipe is a spiral metal coil.

[0010] As a further description of the above technical solution:

[0011] A first electromagnetic valve is arranged in the water outlet.

[0012] As a further description of the above technical solution:

[0013] A second solenoid valve is provided at the connection between the flue pipe and the annular insulation pipe.

[0014] As a further description of the above technical solution:

[0015] A temperature sensor is arranged in the heating tank, and the temperature sensor is electrically connected to the corresponding first solenoid valve and the second solenoid valve.

[0016] As a further description of the above technical solution:

[0017] The annular thermal insulation pipe is in a ring shape.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0019] 1. In the present invention, the flue gas generated by the combustion of the boiler enters the annular insulation pipe from the smoke inlet, and the flue gas is diverted from the annular insulation pipe to multiple flue pipes. The multiple flue pipes heat the water in the multiple heating tanks respectively. The heated water is discharged from the water outlet into the drainage buffer tank and then discharged from the drainage outlet, so that the hot water is utilized, the good recovery of the flue gas preheating is achieved, and the effect of energy saving and consumption reduction is achieved.

[0020] 2. In the present invention, after the temperature sensor detects that the water in the heating tank has reached a preset temperature, the second solenoid valve is closed to prevent smoke from entering the corresponding flue pipe, and the first solenoid valve is opened to discharge the hot water in the heating tank from the water outlet into the drainage buffer tank, so that the temperature of the water discharged from the drainage buffer tank from the drain outlet can reach the preset value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The overall structure of a thermal power plant boiler flue gas waste heat energy saving device Figure 1 .

[0022] Figure 2 The overall structure of a thermal power plant boiler flue gas waste heat energy saving device Figure 2 .

[0023] Figure 3 It is a cross-sectional view of a flue gas waste heat energy-saving device for a thermal power plant boiler.

[0024] Figure 4 It is a partial cross-sectional view of a flue gas waste heat energy-saving device for a thermal power plant boiler.

[0025] Legend:

[0026] 1. Fixed frame; 2. Heating tank; 3. Annular insulation pipe; 4. Flue pipe; 5. Drainage buffer tank; 6. Water inlet; 7. Water outlet; 8. Drain outlet; 9. Smoke inlet; 10. First solenoid valve; 11. Second solenoid valve; 12. Temperature sensor. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, rather than all the embodiments. The components of the embodiment of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but only represents the selected embodiment of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the embodiments of the present invention, it should be noted that the terms "upper", "inside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1-4 The present invention provides a technical solution: a thermal power plant boiler flue gas waste heat energy-saving device, comprising a fixed frame 1, a plurality of heating tanks 2, an annular insulation pipe 3, a plurality of flue pipes 4 and a drainage buffer tank 5, wherein the plurality of heating tanks 2 are mounted on the fixed frame 1, and the upper and lower ends of the heating tanks 2 are respectively provided with a water inlet 6 and a water outlet 7, the drainage buffer tank 5 is arranged below the plurality of heating tanks 2, and the drainage buffer tank 5 is connected to the plurality of water outlets 7 of the plurality of heating tanks 2, and a drainage port 8 is arranged at the lower end of the drainage buffer tank 5, the plurality of flue pipes 4 respectively pass through the plurality of heating tanks 2, a smoke inlet 9 is provided on the annular insulation pipe 3, and the annular insulation pipe 3 is connected to the ends of the plurality of flue pipes 4;

[0029] The plurality of heating tanks 2 are arranged in a circular array to ensure strong support stability of the fixing frame 1;

[0030] The flue pipe 4 is a spiral metal coil, which increases the contact time between the flue gas and the water in the heating tank 2, so that the heat is fully transferred to the water;

[0031] A first solenoid valve 10 is provided in the water outlet 7 to facilitate control of water discharge from the heating tank 2;

[0032] A second solenoid valve 11 is provided at the connection between the flue pipe 4 and the annular insulation pipe 3 to facilitate the control of smoke intake into the flue pipe 4;

[0033] The heating tank 2 is provided with a temperature sensor 12, and the temperature sensor 12 is electrically connected to the corresponding first solenoid valve 10 and the second solenoid valve 11. After the temperature sensor 12 detects that the water in the heating tank 2 reaches a preset temperature, the second solenoid valve 11 is closed to prevent smoke from entering the corresponding flue pipe 4, and the first solenoid valve 10 is opened to discharge the hot water in the heating tank 2 from the water outlet 7 into the drainage buffer tank 5, so that the temperature of the water discharged from the drainage outlet 8 in the drainage buffer tank 5 can reach a preset value;

[0034] The annular thermal insulation pipe 3 is in a circular ring shape.

[0035] Working principle: First, cold water is injected into the heating tank 2, the first solenoid valve 10 is in a closed state, and the second solenoid valve 11 is in an open state. Secondly, the flue gas generated by the boiler combustion enters the annular insulation pipe 3 from the smoke inlet 9, and the flue gas is diverted from the annular insulation pipe 3 to multiple flue pipes 4. The multiple flue pipes 4 heat the water in the multiple heating tanks 2 respectively. Then, after the temperature sensor 12 detects that the water in the heating tank 2 reaches the preset temperature, the second solenoid valve 11 is closed to prevent the flue gas from entering the corresponding flue pipe 4, and the first solenoid valve 10 is opened to discharge the hot water in the heating tank 2 from the water outlet 7 into the drainage buffer tank 5, so that the temperature of the water discharged from the drain port 8 in the drainage buffer tank 5 can reach the preset value. Finally, the hot water is discharged from the drain port 8, so that the hot water is utilized, and a good recovery of the flue gas preheating is achieved, which has the effect of energy saving and consumption reduction.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thermal power plant boiler flue gas waste heat energy saving device, characterized in that: The invention comprises a fixing frame (1), a plurality of heating tanks (2), an annular heat-insulating pipe (3), a plurality of flue pipes (4) and a drainage buffer tank (5). The plurality of heating tanks (2) are mounted on the fixing frame (1). The upper end and the lower end of the heating tank (2) are respectively provided with a water inlet (6) and a water outlet (7). The drainage buffer tank (5) is arranged below the plurality of heating tanks (2), and the drainage buffer tank (5) is connected to the plurality of water outlets (7) of the plurality of heating tanks (2). The lower end of the drainage buffer tank (5) is provided with a drainage port (8). The plurality of flue pipes (4) respectively pass through the plurality of heating tanks (2). The annular heat-insulating pipe (3) is provided with a smoke inlet (9), and the annular heat-insulating pipe (3) is connected to the ends of the plurality of flue pipes (4).

2. A thermal power plant boiler flue gas waste heat energy saving device according to claim 1, characterized in that: The plurality of heating tanks (2) are arranged in a circular array.

3. The thermal power plant boiler flue gas waste heat energy saving device according to claim 1, characterized in that: The flue pipe (4) is a spiral metal coil.

4. A thermal power plant boiler flue gas waste heat energy saving device according to claim 1, characterized in that: A first solenoid valve (10) is arranged in the water outlet (7).

5. A thermal power plant boiler flue gas waste heat energy saving device according to claim 4, characterized in that: A second solenoid valve (11) is provided at the connection between the flue pipe (4) and the annular thermal insulation pipe (3).

6. A thermal power plant boiler flue gas waste heat energy saving device according to claim 5, characterized in that: A temperature sensor (12) is arranged in the heating tank (2), and the temperature sensor (12) is electrically connected to the corresponding first solenoid valve (10) and the second solenoid valve (11).

7. The thermal power plant boiler flue gas waste heat energy saving device according to claim 1, characterized in that: The annular thermal insulation pipe (3) is in the shape of a circular ring.

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