Power plant tail gas waste heat utilization device

Abstract

The utility model belongs to the technical field of waste heat utilization, and particularly relates to a power plant tail gas waste heat utilization device which comprises a heat exchanger, gas inlet ends are fixedly connected to the two sides of the heat exchanger respectively, gas outlet ends are installed at the two ends of the heat exchanger respectively, and first valves are installed at the gas outlet ends. A three-way air inlet pipe is fixedly connected to the opposite sides of the two air inlet ends, second valves are installed on the two sides of the three-way air inlet pipe correspondingly, and filtering assemblies are installed in the air inlet ends; particulate matters in tail gas are filtered through the filter screen, soot attached to the surface of the heat exchange pipe is reduced, when the tail gas flows, through cooperation with the blades, the supporting column and the filter screen are driven to rotate to generate centrifugal force, and the soot attached to the surface of the filter screen can be greatly reduced; and the filter screen is taken out, and filtered impurities are cleaned.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization, in particular to a device for utilizing waste heat from tail gas of a power plant. Background Art

[0002] A large amount of high-temperature flue gas will be generated when the power plant is heating. If the high-temperature flue gas produced by the power plant is directly discharged, it will cause environmental pollution, and the direct discharge of high-temperature flue gas will cause waste of heat energy. When the power plant discharges high-temperature flue gas, the high-temperature heat inside the flue gas can be recovered and utilized through the waste heat recovery device, thereby increasing the utilization rate of energy. The existing waste heat recovery device for power plant heating still has certain defects when used, such as;

[0003] The existing high-temperature flue gas discharged from power plants for heating will recycle the high-temperature heat of the flue gas through a waste heat recovery device, but a large amount of dust and impurities will remain inside the high-temperature flue gas discharged from power plants for heating. When the flue gas passes through the inside of the collection box, the dust and impurities in the flue gas are adsorbed on the heat pipe. When the dust on the heat pipe gradually increases, the heat absorption efficiency of the heat pipe will be reduced, and it is inconvenient to clean the heat pipe. Improvements are needed; therefore, a power plant tail gas waste heat utilization device is proposed to address the above problems. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the utility model proposes a device for utilizing waste heat from tail gas of a power plant.

[0005] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes a power plant tail gas waste heat utilization device, including a heat exchanger, both sides of the heat exchanger are fixedly connected with air inlet ends, both ends of the heat exchanger are respectively installed with air outlet ends, valve one is installed on the air outlet end, the opposite side of the two air inlet ends is fixedly connected with a three-way air inlet pipe, both sides of the three-way air inlet pipe are respectively installed with valve two, the interior of the air inlet end is installed with a filter assembly, the filter assembly includes a filter screen, the filter screen is installed inside the air inlet end, and the bottom center of the filter screen is fixedly connected with a support column The bottom end of the support column is rotatably connected with a sealing seat, and the sealing seat is threadedly installed at the bottom end of the air intake end. The exhaust pipe is connected to the three-way air intake pipe, so that the exhaust gas enters the interior of the heat exchanger through the three-way air intake pipe and the air intake end, and exchanges heat through the heat exchange pipe. When the exhaust gas passes through the air intake end, the particulate matter in the exhaust gas is filtered by the filter to reduce the adhesion of soot on the surface of the heat exchange pipe. When the surface of the filter needs to be cleaned, the exhaust gas is stopped from flowing from the air intake end by closing the second valve on one side of the filter, and the second valve on the other side is opened, so that the sealing seat is disassembled to take out the filter and the filtered impurities without affecting the flow of the exhaust gas.

[0006] Preferably, a one-way valve is installed on the air inlet end, and the one-way valve controls the one-way flow direction of the exhaust gas to prevent the exhaust gas inside the heat exchanger from flowing back from the air inlet end.

[0007] Preferably, the height of the filter screen is higher than the interface between the air inlet end and the three-way air inlet pipe.

[0008] Preferably, the surface of the support column is fixedly connected with annularly distributed blades at the interface corresponding to the air inlet end and the three-way air inlet pipe. When the exhaust gas flows, it cooperates with the blades to drive the support column and the filter screen to rotate and generate centrifugal force, which can greatly reduce the clogging of the filter screen surface by soot.

[0009] Preferably, the interior of the heat exchanger is symmetrically and fixedly connected with two partition layers, the two partition layers separate the interior of the heat exchanger into a heat exchange chamber, a temperature sensor is installed inside the heat exchange chamber, and heat exchange tubes distributed in a ring are fixedly connected to opposite sides of the two partition layers.

[0010] Preferably, a liquid inlet is installed above the heat exchanger, and a liquid outlet is installed below the heat exchanger. Control valves are installed on the liquid inlet and the liquid outlet, respectively. Water is added to the interior of the heat exchange chamber through the liquid inlet, and the water temperature is monitored by a temperature sensor. After the water boils, it is discharged from the liquid outlet for utilization.

[0011] Preferably, a pipe cleaning assembly is installed inside the heat exchanger, and the pipe cleaning assembly includes a plurality of guide rods passing through the heat exchange tubes, and both ends of the guide rods are fixedly connected with hollow brackets, and the outer wall of the hollow brackets is fixedly connected to the heat exchanger. When the heat exchanger is in use, valve one and valve two on one side of the heat exchanger are always in opposite working states, and the flow direction of the exhaust gas is controlled by switching valve two on the left and right sides of the heat exchanger to achieve two-way flow. When the flow direction of the exhaust gas inside the heat exchanger is switched, the cleaning block is driven to slide left and right, thereby cleaning the tube wall of the heat exchange tube, removing dirt attached to the inner wall of the heat exchange tube, and improving the heat exchange effect.

[0012] Preferably, a cleaning block is slidably connected to the surface of the guide rod, and the outer wall of the cleaning block fits the inner wall of the heat exchange tube.

[0013] The utility model is beneficial in that:

[0014] 1. The utility model filters particulate matter in the exhaust gas through the filter, thereby reducing the adhesion of soot on the surface of the heat exchange tube. When the exhaust gas flows, it cooperates with the blades to drive the support column filter to rotate and generate centrifugal force, which can greatly reduce the adhesion of soot on the surface of the filter. By switching valve 2, the filter and the filtered impurities can be taken out for cleaning without affecting the flow of exhaust gas.

[0015] 2. The utility model controls valve 1 and valve 2 on one side of the heat exchanger to always be in opposite working states, and controls the flow direction of the exhaust gas by switching valve 2 on the left and right sides of the heat exchanger to achieve two-way flow. When the flow direction of the exhaust gas inside the heat exchanger is switched, the cleaning block is driven to slide left and right, thereby cleaning the tube wall of the heat exchange tube, removing dirt attached to the inner wall of the heat exchange tube, and improving the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a cross-sectional view of the heat exchanger of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the filter assembly of the utility model;

[0020] Figure 4 For this utility model Figure 3 A structural diagram of ;

[0021] Figure 5 This is a schematic diagram of the structure of the pipeline cleaning component of the utility model.

[0022] In the figure: 1. heat exchanger; 2. partition layer; 3. heat exchange chamber; 4. heat exchange tube; 5. air inlet end; 6. air outlet end; 7. three-way air inlet pipe; 8. filter assembly; 81. filter screen; 82. support column; 83. sealing seat; 84. blade; 9. pipeline cleaning assembly; 91. guide rod; 92. hollow bracket; 93. cleaning block; 10. valve one; 11. valve two; 12. one-way valve; 13. liquid inlet end; 14. liquid outlet end. DETAILED DESCRIPTION

[0023] 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 of 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.

[0024] Embodiment 1

[0025] See also Figure 1-4 As shown, a power plant tail gas waste heat utilization device includes a heat exchanger 1, and the two sides of the heat exchanger 1 are respectively fixedly connected with an air inlet end 5, and the two ends of the heat exchanger 1 are respectively installed with an air outlet end 6, and a valve 10 is installed on the air outlet end 6. The opposite side of the two air inlet ends 5 is fixedly connected with a three-way air inlet pipe 7, and the two sides of the three-way air inlet pipe 7 are respectively installed with a valve 2 11. The interior of the air inlet end 5 is installed with a filter assembly 8, and the filter assembly 8 includes a filter screen 81, and the filter screen 81 is installed inside the air inlet end 5. The center of the bottom of the filter screen 81 is fixedly connected with a support column 82, and the bottom end of the support column 82 is rotatably connected with a sealing seat 83, and the sealing seat 8 3 is threadedly installed at the bottom end of the air inlet end 5, and the exhaust pipe is connected to the three-way air inlet pipe 7, so that the exhaust gas enters the interior of the heat exchanger 1 through the three-way air inlet pipe 7 and the air inlet end 5, and is heat exchanged through the heat exchange tube 4. When the exhaust gas passes through the air inlet end 5, the particulate matter in the exhaust gas is filtered by the filter 81 to reduce the adhesion of soot on the surface of the heat exchange tube 4. When the surface of the filter 81 needs to be cleaned, the exhaust gas is stopped from flowing from the air inlet end 5 by closing the valve 11 on one side of the filter 81, and the valve 11 on the other side is opened, and then the sealing seat 83 is disassembled to take out the filter 81 and the filtered impurities for cleaning without affecting the flow of the exhaust gas.

[0026] A one-way valve 12 is installed on the air inlet end 5 , and the one-way valve 12 controls the one-way flow direction of the exhaust gas to prevent the exhaust gas inside the heat exchanger 1 from flowing back from the air inlet end 5 .

[0027] The height of the filter screen 81 is higher than the interface between the air inlet end 5 and the three-way air inlet pipe 7 .

[0028] The surface of the support column 82 is fixedly connected with annularly distributed blades 84 at the interface corresponding to the air intake end 5 and the three-way air intake pipe 7. When the exhaust gas flows, it cooperates with the blades 84 to drive the support column 82 and the filter screen 81 to rotate and generate centrifugal force, which can greatly reduce the blockage of soot on the surface of the filter screen 81.

[0029] Two partition layers 2 are symmetrically fixedly connected inside the heat exchanger 1. The two partition layers 2 separate the inside of the heat exchanger 1 into a heat exchange chamber 3. A temperature sensor is installed inside the heat exchange chamber 3. Heat exchange tubes 4 distributed in a ring shape are fixedly connected to the opposite side of the two partition layers 2.

[0030] A liquid inlet 13 is installed above the heat exchanger 1, and a liquid outlet 14 is installed below the heat exchanger 1. Control valves are installed on the liquid inlet 13 and the liquid outlet 14 respectively. Water is added to the interior of the heat exchange chamber 3 through the liquid inlet 13. The water temperature is monitored by a temperature sensor and after the water boils, it is discharged from the liquid outlet 14 for utilization.

[0031] Embodiment 2

[0032] For comparison with Example 1, please refer to Figure 5As shown, the utility model provides another embodiment, a pipe cleaning assembly 9 is installed inside the heat exchanger 1, and the pipe cleaning assembly 9 includes a plurality of guide rods 91 that penetrate the heat exchange tube 4, and both ends of the guide rods 91 are fixedly connected with hollow brackets 92, and the outer wall of the hollow bracket 92 is fixedly connected to the heat exchanger 1. When the heat exchanger 1 is in use, the valve 10 and the valve 2 11 on one side of the heat exchanger 1 are always in opposite working states, and the flow direction of the exhaust gas is controlled by switching the valve 2 11 on the left and right sides of the heat exchanger 1 to achieve two-way flow. When the flow direction of the exhaust gas inside the heat exchanger 1 is switched, the cleaning block 93 is driven to slide left and right, thereby cleaning the tube wall of the heat exchange tube 4, removing the dirt attached to the inner wall of the heat exchange tube 4, and improving the heat exchange effect.

[0033] A cleaning block 93 is slidably connected to the surface of the guide rod 91 , and the outer wall of the cleaning block 93 fits the inner wall of the heat exchange tube 4 .

[0034] Through the personnel in this field, all the electrical components in this case are connected to their corresponding power supplies through wires, and according to the actual situation, appropriate controllers and temperature sensors should be selected for electrical connection to meet the control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between the electrical components is completed in the order of working. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principles and processes, and does not explain the electrical control.

[0035] Working principle: when the heat exchanger 1 is in use, the valve 1 10 and the valve 2 11 on one side of the heat exchanger 1 are always in opposite working states, and the flow direction of the exhaust gas is controlled by switching the valve 2 11 on the left and right sides of the heat exchanger 1 to achieve two-way flow. When the flow direction of the exhaust gas inside the heat exchanger 1 is switched, the cleaning block 93 is driven to slide left and right, thereby cleaning the tube wall of the heat exchange tube 4, removing the dirt attached to the inner wall of the heat exchange tube 4, and improving the heat exchange effect.

[0036] The exhaust gas discharge pipe is connected to the three-way intake pipe 7, so that the exhaust gas enters the interior of the heat exchanger 1 through the three-way intake pipe 7 and the intake end 5, and is heat exchanged through the heat exchange tube 4. When the exhaust gas passes through the intake end 5, the particulate matter in the exhaust gas is filtered by the filter 81 to reduce the adhesion of soot on the surface of the heat exchange tube 4. When the surface of the filter 81 needs to be cleaned, the exhaust gas is controlled to stop flowing from the intake end 5 by closing the valve 2 11 on one side of the filter 81, and the valve 2 11 on the other side is opened, and then the sealing seat 83 is disassembled without affecting the flow of the exhaust gas, and the filter 81 and the filtered impurities are taken out for cleaning.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A device for utilizing waste heat from tail gas of a power plant, comprising a heat exchanger (1), characterized in that: The heat exchanger (1) is fixedly connected to two sides of the heat exchanger (1) with air inlet ends (5), and the two ends of the heat exchanger (1) are respectively installed with air outlet ends (6). The air outlet ends (6) are installed with valve one (10). The opposite sides of the two air inlet ends (5) are fixedly connected with three-way air inlet pipes (7). The two sides of the three-way air inlet pipes (7) are respectively installed with valve two (11). The air inlet ends (5) are installed with a filter assembly (8). The filter assembly (8) comprises a filter screen (81). The filter screen (81) is installed inside the air inlet end (5). The center of the bottom of the filter screen (81) is fixedly connected with a support column (82). The bottom end of the support column (82) is rotatably connected with a sealing seat (83), and the sealing seat (83) is threadedly installed on the bottom end of the air inlet end (5).

2. The power plant tail gas waste heat utilization device according to claim 1, characterized in that: A one-way valve (12) is installed on the air inlet end (5).

3. The power plant tail gas waste heat utilization device according to claim 1, characterized in that: The height of the filter screen (81) is higher than the interface between the air inlet end (5) and the three-way air inlet pipe (7).

4. The power plant tail gas waste heat utilization device according to claim 1, characterized in that: The surface of the support column (82) is fixedly connected with blades (84) distributed in an annular shape at the interface between the air inlet end (5) and the three-way air inlet pipe (7).

5. The power plant tail gas waste heat utilization device according to claim 1, characterized in that: Two partition layers (2) are symmetrically and fixedly connected inside the heat exchanger (1); the two partition layers (2) separate the inside of the heat exchanger (1) into a heat exchange chamber (3); and heat exchange tubes (4) distributed in an annular shape are fixedly connected to opposite sides of the two partition layers (2).

6. The power plant tail gas waste heat utilization device according to claim 1, characterized in that: A liquid inlet (13) is installed above the heat exchanger (1), and a liquid outlet (14) is installed below the heat exchanger (1). Control valves are installed on the liquid inlet (13) and the liquid outlet (14), respectively.

7. The power plant tail gas waste heat utilization device according to claim 5, characterized in that: A pipe cleaning assembly (9) is installed inside the heat exchanger (1), and the pipe cleaning assembly (9) comprises a plurality of guide rods (91) penetrating the heat exchange tube (4), and both ends of the guide rods (91) are respectively fixedly connected to hollow brackets (92), and the outer wall of the hollow bracket (92) is fixedly connected to the heat exchanger (1).

8. The power plant tail gas waste heat utilization device according to claim 7, characterized in that: A cleaning block (93) is slidably connected to the surface of the guide rod (91), and the outer wall of the cleaning block (93) fits the inner wall of the heat exchange tube (4).

Images