Waste heat recovery device for thermal energy power engineering of power plant

Abstract

The utility model discloses a waste heat recovery device for power plant thermal energy power engineering, which comprises a flue gas conveying pipeline, a heat preservation cover, a PLC (Programmable Logic Controller), a first water pump and a second water pump, a plurality of heating pipes are uniformly and fixedly arranged in the flue gas conveying pipeline, and the heating pipes are connected through pipelines; two fixing supports are symmetrically and fixedly connected to the heating pipe, an input pipe is fixedly installed at the input end, located at the input end of the flue gas conveying pipeline, of the heating pipe, an output pipe is fixedly installed at the output end, located at the output end of the flue gas conveying pipeline, of the heating pipe, and a first electromagnetic valve is fixedly installed on the input pipe. Water is heated through heat of high-temperature flue gas in the flue gas conveying pipeline, effective utilization of energy is achieved, meanwhile, the temperature of the flue gas is reduced by heating the water through heat exchange, and therefore pollution of high-temperature gas to the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery in power plants, in particular to a waste heat recovery device used in thermal power engineering of power plants. Background Art

[0002] A power plant, also called a power plant, is a power plant that converts some form of raw energy into electrical energy for fixed facilities or transportation, such as thermal, hydroelectric, steam, diesel or nuclear power plants. The types of power plants vary according to the energy they use, and can be mainly divided into hydroelectric power plants, thermal power plants, wind power plants, nuclear power plants, solar power plants, etc.

[0003] A thermal power plant is a factory that uses combustibles (such as coal) as fuel to produce electricity. In the process of coal combustion heating the boiler, a large amount of waste heat will be generated and discharged with the flue gas. If this waste heat cannot be effectively recovered and utilized, it will cause energy waste and environmental pollution. Therefore, there is an urgent need for a waste heat recovery device for thermal power engineering of power plants to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a waste heat recovery device for thermal power engineering of a power plant to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a waste heat recovery device for thermal power engineering of a power plant, comprising a flue gas conveying pipeline, a heat preservation cover, a PLC controller, a first water pump and a second water pump, a plurality of heating pipes are evenly and fixedly installed inside the flue gas conveying pipeline, the heating pipes are connected by pipes, two fixed brackets are symmetrically and fixedly connected to the heating pipes, an input pipe is fixedly installed at the input end of the heating pipe located at the input end of the flue gas conveying pipeline, an output pipe is fixedly installed at the output end of the heating pipe located at the output end of the flue gas conveying pipeline, a first solenoid valve is fixedly installed on the input pipe, and a temperature sensor and a third solenoid valve are respectively fixedly installed on the output pipe.

[0006] Preferably, a reflux output pipe is fixedly mounted on the input pipe, a reflux input pipe is fixedly mounted on the output pipe, and a second solenoid valve is fixedly mounted on the reflux input pipe.

[0007] Preferably, the heating pipe is fixedly mounted inside the smoke conveying pipe through the fixing bracket, the heat preservation cover is fixedly mounted on the top of the smoke conveying pipe, and the PLC controller is fixedly mounted on the outside of the smoke conveying pipe.

[0008] Preferably, the input pipe and the output pipe respectively penetrate through a side of the smoke conveying duct close to the PLC controller.

[0009] Preferably, the first solenoid valve is located on a side of the reflux output pipe away from the smoke conveying pipeline.

[0010] Preferably, one end of the output pipe away from the heating pipe is fixedly installed on the input end of the second water pump, one end of the reflux input pipe away from the output pipe is fixedly installed on the input end of the first water pump, and one end of the reflux output pipe away from the input pipe is fixedly installed on the output end of the first water pump.

[0011] Preferably, the temperature sensor is located between the smoke delivery duct and the reflux input pipe, the reflux input pipe is located between the temperature sensor and the third solenoid valve, and the third solenoid valve is located between the reflux input pipe and the second water pump.

[0012] Preferably, the PLC controller is electrically connected to the first water pump, the second water pump, the first solenoid valve, the second solenoid valve, the temperature sensor and the third solenoid valve respectively.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] The utility model heats water through the heat of high-temperature flue gas in the flue gas conveying pipeline, thereby realizing the effective utilization of energy. At the same time, the temperature of flue gas is lowered by heating water through heat exchange, thereby reducing the pollution of high-temperature gas to the environment. Through the cooperation of temperature sensor and PLC controller, the water temperature can be monitored in real time, and precise control can be performed according to the preset temperature threshold to ensure that the output water temperature meets the demand. When the water temperature is lower than the set threshold, the system will automatically return the water flow to the heating pipe for reheating. This design enables the system to flexibly respond to the situation of unstable flue gas temperature and ensure the stable output of water temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the smoke delivery pipeline in the utility model;

[0017] Figure 3 It is a partial structural schematic diagram of the heating tube in the utility model.

[0018] In the figure: 1-smoke conveying pipeline, 2-insulation cover, 3-PLC controller, 4-first water pump, 5-second water pump, 6-heating pipe, 7-fixed bracket, 8-input pipe, 9-first solenoid valve, 10-reflux output pipe, 11-reflux input pipe, 12-second solenoid valve, 13-output pipe, 14-temperature sensor, 15-third solenoid valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-3 The utility model provides an embodiment: a waste heat recovery device for thermal power engineering of a power plant, comprising a flue gas conveying pipeline 1, a heat preservation cover 2, a PLC controller 3, a first water pump 4 and a second water pump 5. A plurality of heating pipes 6 are evenly and fixedly installed inside the flue gas conveying pipeline 1. The heating pipes 6 are connected by pipelines. Two fixed brackets 7 are symmetrically and fixedly connected to the heating pipes 6. An input pipe 8 is fixedly installed at the input end of the heating pipe 6 at the input end of the flue gas conveying pipeline 1. An output pipe 13 is fixedly installed at the output end of the heating pipe 6 at the output end of the flue gas conveying pipeline 1. A first solenoid valve 9 is fixedly installed on the input pipe 8. The output A temperature sensor 14 and a third solenoid valve 15 are fixedly installed on the tube 13, a reflux output tube 10 is fixedly installed on the input tube 8, a reflux input tube 11 is fixedly installed on the output tube 13, and a second solenoid valve 12 is fixedly installed on the reflux input tube 11. The heating tube 6 is fixedly installed inside the smoke conveying pipe 1 through a fixed bracket 7, and the insulation cover 2 is fixedly installed on the top of the smoke conveying pipe 1. The heating tube 6 can be conveniently loaded and unloaded through the insulation cover 2. The PLC controller 3 is fixedly installed on the outside of the smoke conveying pipe 1, and the input tube 8 and the output tube 13 respectively penetrate through the smoke conveying pipe 1 on one side close to the PLC controller 3.

[0021] The first solenoid valve 9 is located on the side of the reflux output pipe 10 away from the smoke conveying pipe 1, the end of the output pipe 13 away from the heating pipe 6 is fixedly installed at the input end of the second water pump 5, the end of the reflux input pipe 11 away from the output pipe 13 is fixedly installed at the input end of the first water pump 4, the end of the reflux output pipe 10 away from the input pipe 8 is fixedly installed at the output end of the first water pump 4, the temperature sensor 14 is located between the smoke conveying pipe 1 and the reflux input pipe 11, the reflux input pipe 11 is located between the temperature sensor 14 and the third solenoid valve 15, and the third solenoid valve 15 is located at the reflux input pipe 11. Between the input pipe 11 and the second water pump 5, when the first water pump 4 and the second solenoid valve 12 are closed and the second water pump 5 is turned on, and the first solenoid valve 9 and the third solenoid valve 15 are turned on, water flows into the heating pipe 6 through the input pipe 8 and flows into the second water pump 5 through the output pipe 13. When the first water pump 4 and the second solenoid valve 12 are turned on and the second water pump 5 is turned on, and the first solenoid valve 9 and the third solenoid valve 15 are turned off, water flows into the reflux input pipe 11 through the output pipe 13, flows into the reflux output pipe 10 through the delivery of the first water pump 4, and flows back to the heating pipe 6 through the input pipe 8 and is heated again.

[0022] The PLC controller 3 is electrically connected to the first water pump 4, the second water pump 5, the first solenoid valve 9, the second solenoid valve 12, the temperature sensor 14 and the third solenoid valve 15 respectively. The heating of the device can be conveniently controlled automatically through a preset program, and reflux heating can be performed through temperature control so that the output water temperature is maintained at the required temperature.

[0023] Working principle: During use, first set the control program and temperature threshold for the PLC controller 3, then connect the end of the input pipe 8 away from the heating pipe 6 to the external water source, and connect the output end of the second water pump 5 to the input end of the water tank. When the preheating recovery program is started by the PLC controller 3, the PLC controller 3 controls the second water pump 5, the first solenoid valve 9 and the third solenoid valve 15 to open, and controls the second solenoid valve 12 to close. At this time, water flows into the interior of the heating pipe 6 through the input pipe 8. Since the heating pipe 6 is located inside the flue gas conveying pipe 1, the high-temperature flue gas conveyed in the flue gas conveying pipe 1 heats the heating pipe 6, thereby heating the water inside the heating pipe 6. The water flows into the second water pump 5 through the output pipe 13 and passes through the second water pump 5. The output end flows into the water tank. Since the temperature of the smoke inside the smoke conveying pipe 1 is unstable, when the water temperature detected by the temperature sensor 14 is lower than the threshold value, the PLC controller 3 controls the second water pump 5, the first solenoid valve 9 and the third solenoid valve 15 to close, and at the same time opens the first water pump 4 and the second solenoid valve 12. The first water pump 4 conveys the water in the output pipe 13 to the reflux output pipe 10 through the reflux input pipe 11, and refluxes to the heating pipe 6 through the input pipe 8 for reheating. When the water temperature detected by the temperature sensor 14 reaches the threshold value, the PLC controller 3 controls the second water pump 5, the first solenoid valve 9 and the third solenoid valve 15 to open, and at the same time controls the first water pump 4 and the second solenoid valve 12 to close, and continues to heat the water and convey it to the water tank for standby.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for thermal power engineering of a power plant, comprising a flue gas conveying pipeline (1), a heat preservation cover (2), a PLC controller (3), a first water pump (4) and a second water pump (5), characterized in that: A plurality of heating tubes (6) are evenly and fixedly installed inside the smoke conveying pipe (1), the heating tubes (6) are connected by pipes, two fixing brackets (7) are symmetrically and fixedly connected to the heating tube (6), an input tube (8) is fixedly installed at the input end of the heating tube (6) located at the input end of the smoke conveying pipe (1), and an output tube (13) is fixedly installed at the output end of the heating tube (6) located at the output end of the smoke conveying pipe (1), a first solenoid valve (9) is fixedly installed on the input tube (8), and a temperature sensor (14) and a third solenoid valve (15) are respectively fixedly installed on the output tube (13); A reflux output pipe (10) is fixedly mounted on the input pipe (8), a reflux input pipe (11) is fixedly mounted on the output pipe (13), and a second solenoid valve (12) is fixedly mounted on the reflux input pipe (11).

2. The waste heat recovery device for thermal power engineering of a power plant according to claim 1, characterized in that: The heating pipe (6) is fixedly mounted inside the smoke conveying pipe (1) via the fixing bracket (7), the heat-insulating cover (2) is fixedly mounted on the top of the smoke conveying pipe (1), and the PLC controller (3) is fixedly mounted on the outside of the smoke conveying pipe (1).

3. The waste heat recovery device for thermal power engineering of a power plant according to claim 2 is characterized in that: The input pipe (8) and the output pipe (13) respectively penetrate through a side of the smoke conveying pipeline (1) close to the PLC controller (3).

4. The waste heat recovery device for thermal power engineering of a power plant according to claim 1, characterized in that: The first solenoid valve (9) is located on a side of the reflux output pipe (10) away from the smoke conveying pipe (1).

5. The waste heat recovery device for thermal power engineering of a power plant according to claim 3 is characterized by: The end of the output pipe (13) away from the heating pipe (6) is fixedly mounted on the input end of the second water pump (5), the end of the reflux input pipe (11) away from the output pipe (13) is fixedly mounted on the input end of the first water pump (4), and the end of the reflux output pipe (10) away from the input pipe (8) is fixedly mounted on the output end of the first water pump (4).

6. The waste heat recovery device for thermal power engineering of a power plant according to claim 5, characterized in that: The temperature sensor (14) is located between the smoke conveying pipe (1) and the reflux input pipe (11), the reflux input pipe (11) is located between the temperature sensor (14) and the third solenoid valve (15), and the third solenoid valve (15) is located between the reflux input pipe (11) and the second water pump (5).

7. The waste heat recovery device for thermal power engineering of a power plant according to claim 1, characterized in that: The PLC controller (3) is respectively electrically connected to the first water pump (4), the second water pump (5), the first solenoid valve (9), the second solenoid valve (12), the temperature sensor (14) and the third solenoid valve (15).

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