A flue gas waste heat recovery system for thermal power plants

Abstract

The present application discloses a flue gas waste heat recovery system for a thermal power plant, which relates to the technical field of flue gas waste heat recovery. The system includes a box body. The inner cavity of the box body is sequentially divided into a first inner chamber, a second inner chamber, and a third inner chamber from left to right by two sets of partition plates. A dust filter screen is arranged between the second inner chamber and the third inner chamber, and the dust filter screen is fitted and installed on a set of partition plates. A smoke guiding cylinder is arranged in the inner cavity of the first inner chamber. The input end of the smoke guiding cylinder penetrates through the left side wall of the box body, and the output end of the smoke guiding cylinder extends into the inner cavity of the second inner chamber. A dust cleaning mechanism and a dust collection mechanism are arranged in the inner cavity of the second inner chamber, and the dust collection mechanism is located below the dust cleaning mechanism. A waste heat recovery mechanism is arranged in the inner cavity of the third inner chamber. A single-chip microcomputer is installed at the bottom of the box body, and the single-chip microcomputer is connected to the dust cleaning mechanism in a control manner. The present application facilitates the recovery of waste heat from the flue gas and also facilitates the cleaning of dust in the flue gas, reducing the possibility of blockage of the pipeline caused by the dust in the flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas waste heat recovery, and in particular to a flue gas waste heat recovery system for a thermal power plant. Background Art

[0002] Thermal power plants, also known as thermal power plants, are plants that use combustibles (such as coal) as fuel to produce electricity. They are divided into coal-fired power plants, gas-fired power plants, waste heat power plants, and various power plants that use garbage and industrial waste as fuel.

[0003] At present, in the flue gas waste heat recovery system of thermal power plants, the dust in the flue gas is not filtered when the flue gas waste heat is recovered. In this way, when the flue gas is transported for waste heat recovery, the dust in the flue gas will be adsorbed on the inner wall of the pipeline, which may easily cause the pipeline to be blocked in the long run. Therefore, we propose a flue gas waste heat recovery system for thermal power plants. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned problems existing in the prior art and to provide a flue gas waste heat recovery system for a thermal power plant, which is convenient for recovering waste heat from the flue gas and also convenient for cleaning dust in the flue gas, thereby reducing the possibility of dust in the flue gas clogging the pipeline.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A flue gas waste heat recovery system for a thermal power plant comprises a box body, wherein the inner cavity of the box body is divided into a first inner chamber, a second inner chamber and a third inner chamber from left to right in sequence by two sets of partition plates, a dust filter is arranged between the second inner chamber and the third inner chamber, and the dust filter is mounted on a set of partition plates;

[0007] The inner cavity of the first inner chamber is provided with a smoke exhaust pipe, the input end of the smoke exhaust pipe passes through the left side wall of the box body, and the output end of the smoke exhaust pipe extends into the inner cavity of the second inner chamber. The inner cavity of the second inner chamber is provided with a dust cleaning mechanism and a dust collecting mechanism, and the dust collecting mechanism is located below the dust cleaning mechanism. The inner cavity of the third inner chamber is provided with a waste heat recovery mechanism, and a single-chip microcomputer is installed at the bottom of the box body, and the single-chip microcomputer is controllably connected to the dust cleaning mechanism.

[0008] Preferably, a circulation mechanism is provided on the top of the box body, and a circulating water pipe is provided at the bottom of the rear side wall of the inner cavity of the first inner chamber, the circulation mechanism includes water and a sprinkler, the water pump is electrically connected to the single-chip computer input, the output end of the water pump is connected to the input end of the sprinkler through a conduit, the input end of the water pump is connected to the output end of the circulating water pipe penetrating the outside of the rear side wall of the box body through a conduit, and the output end of the sprinkler extends into the inner cavity of the first inner chamber.

[0009] Based on the above technical features, the water source in the first inner chamber can be circulated therein by the operation of the water pump.

[0010] Preferably, a first water inlet pipe is provided at the top of the left side wall of the box body, and a first water outlet pipe is provided at the bottom of the left side wall of the box body, and a first solenoid valve and a second solenoid valve are provided on the first water inlet pipe and the first water outlet pipe respectively, and the first solenoid valve and the second solenoid valve are electrically connected to the single-chip microcomputer input, and a first temperature-controlled switch is provided at the bottom of the box body, and the top sensing end of the first temperature-controlled switch extends into the bottom end of the inner cavity of the first inner chamber, and the first temperature-controlled switch is electrically connected to the single-chip microcomputer output.

[0011] Based on the above technical features, it is convenient to control the input and output of water into the first inner chamber.

[0012] Preferably, a second water inlet pipe is arranged on the right side of the top of the box body, and a second water outlet pipe is arranged on the bottom of the right side wall of the box body, and a third solenoid valve and a fourth solenoid valve are respectively arranged on the second water inlet pipe and the second water outlet pipe, and the third solenoid valve and the fourth solenoid valve are electrically connected to the input of the single-chip computer, and a second temperature-controlled switch is arranged at the bottom of the box body, and the top sensing end of the second temperature-controlled switch extends into the bottom end of the inner cavity of the third inner chamber, and the second temperature-controlled switch is electrically connected to the output of the single-chip computer.

[0013] Based on the above technical features, it is convenient to control the input and output of water into the third inner chamber.

[0014] Preferably, a forward and reverse motor is provided on the rear side wall of the box body, and the dust cleaning mechanism includes a supporting strip, a first pressure sensor and a second pressure sensor, the first pressure sensor is installed on the rear side of the top of the inner cavity of the second inner chamber, and a cleaning brush is fixed to the right side wall of the supporting strip, the second pressure sensor is installed on the rear side of the bottom of the inner cavity of the second inner chamber, and the second pressure sensor is located above the dust collection mechanism, the forward and reverse motor is electrically connected to the single-chip microcomputer, and the first pressure sensor and the second pressure sensor are electrically connected to the single-chip microcomputer output.

[0015] Based on the above technical features, it is convenient to input signals to the single chip microcomputer.

[0016] Preferably, a transmission chain is fixedly connected to the front and rear ends of the left side wall of the support strip, and shafts are provided at the upper and lower ends of the left side of the support strip. The shafts are rotatably connected to the box body, and the power output end of the forward and reverse motor is connected to one end of the upper shaft that passes through the rear wall of the box body. Gears are transmission-connected to the upper and lower sides of the inner cavity of the transmission chain, and the gears are fixed to the corresponding shafts.

[0017] Based on the above technical features, it is easy to drive the gears to rotate when power is provided by the forward and reverse motor.

[0018] Preferably, the dust collection mechanism includes a dust collection base and a bent pipe. A dust guiding groove is formed at the top of the dust collection base. The bent pipe is fixedly connected to the bottom of the box body. The input end of the bent pipe communicates with the bottom of the inner cavity of the dust guiding groove. A dust collection cylinder is screwed to the output end of the bent pipe.

[0019] Based on the above technical features, it is convenient to collect the soot cleaned from the dust filter net.

[0020] Preferably, the waste heat recovery mechanism includes a waste heat recovery pipe group and a smoke guiding hood. The waste heat recovery pipe group is composed of several groups of spiral pipes sleeved on each other from the inside to the outside in sequence. The top output end of the outermost spiral pipe communicates with a smoke outlet pipe. The smoke outlet pipe is installed on the right side wall of the box body. The bottom input end of the innermost spiral pipe communicates with a smoke inlet pipe. The head and tail of adjacent two groups of spiral pipes are connected to each other.

[0021] Based on the above technical features, it is convenient for the flue gas to be conveyed spirally in all the spiral pipes.

[0022] Preferably, the smoke guiding hood is fixedly connected to the left side wall of the inner cavity of the third inner chamber, and the left side of the inner cavity of the smoke guiding hood corresponds to the position of the dust filter net. A smoke guiding groove is formed at the bottom of the inner cavity of the smoke guiding hood. The bottom of the smoke guiding hood is communicated with a smoke guiding pipe through the smoke guiding groove, and the output end of the smoke guiding pipe is connected to the smoke inlet pipe.

[0023] Based on the above technical features, it is convenient to guide and convey the flue gas into the smoke inlet pipe.

[0024] In summary, the present invention has at least one of the following beneficial effects:

[0025] First, by using water in the first inner chamber and cooperating with the circulation mechanism and the circulation water pipe to conduct water circulation, the waste heat of the flue gas is recovered for the first time, and then in the third inner chamber, the waste heat is recovered for the second time by cooperating with the water source and the waste heat recovery mechanism, so as to facilitate the recovery of the waste heat of the flue gas.

[0026] Second, through the cooperation of the forward and reverse motor, the dust filter net and the dust cleaning mechanism, it is convenient to filter and clean the dust in the flue gas, and reduce the possibility of the dust in the flue gas blocking the pipeline.

[0027] Third, through the dust collection mechanism, it is convenient to centrally collect and clean the dust cleaned from the flue gas, and reduce the possibility of dust accumulation in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the use state of the present invention;

[0029] Figure 2 is a schematic structural diagram of the circulation mechanism of the present invention;

[0030] Figure 3 is a schematic structural diagram of the dust cleaning mechanism of the present invention;

[0031] Figure 4 of the present invention Figure 1 top view cross-sectional view;

[0032] Figure 5 is a schematic structural diagram of the dust collection mechanism of the present invention;

[0033] Figure 6 is a schematic structural diagram of the waste heat recovery mechanism of the present invention;

[0034] Figure 7 is a schematic structural diagram of the waste heat recovery pipe group of the present invention Figure 1 ;

[0035] Figure 8 is a schematic structural diagram of the waste heat recovery pipe group of the present invention Figure 2 ;

[0036] Figure 9 is a schematic block diagram of the control system of the present invention;

[0037] In the drawings, the list of components represented by each reference numeral is as follows:

[0038] 1 - box body, 2 - circulation mechanism, 201 - water pump, 202 - sprayer, 3 - first inner chamber, 4 - second inner chamber, 5 - third inner chamber, 6 - dust collection mechanism, 601 - dust collection seat, 602 - dust guide groove, 603 - bent pipe, 604 - dust collection cylinder, 7 - dust cleaning mechanism, 701 - first pressure sensor, 702 - cleaning brush, 703 - support strip, 704 - second pressure sensor, 705 - shaft rod, 706 - gear, 707 - drive chain, 8 - waste heat recovery mechanism, 801 - waste heat recovery pipe group, 8011 - smoke inlet pipe, 8012 - spiral pipe, 8013 - smoke outlet pipe, 802 - smoke induction hood, 803 - smoke guide groove, 804 - smoke guide pipe, 9 - smoke induction cylinder, 10 - dust filter screen, 11 - first water inlet pipe, 12 - first water outlet pipe, 13 - first temperature control switch, 14 - single-chip microcomputer, 15 - second water inlet pipe, 16 - second water outlet pipe, 17 - second temperature control switch, 18 - circulating water pipe, 19 - forward and reverse motor. Detailed implementation manners

[0039] The following further describes the present invention in detail with reference to the attached Figure 1-9 drawings.

[0040] An embodiment provided by the present invention: As Figure 1As shown in the figure, a flue gas waste heat recovery system for a thermal power plant includes a box body 1. The inner cavity of the box body 1 is sequentially divided into a first inner chamber 3, a second inner chamber 4, and a third inner chamber 5 from left to right by two groups of partition plates. A dust filter screen 10 is arranged between the second inner chamber 4 and the third inner chamber 5, and the dust filter screen 10 is fitted and installed on a group of partition plates.

[0041] An exhaust gas pipe 9 is arranged in the inner cavity of the first inner chamber 3. The input end of the exhaust gas pipe 9 penetrates through the left side wall of the box body 1, and the output end of the exhaust gas pipe 9 extends into the inner cavity of the second inner chamber 4. The output end of the exhaust gas pipe 9 is in a horn shape, which is convenient for expanding the contact area between the flue gas and the dust filter screen 10, so that the flue gas is fully filtered by the dust filter screen 10. A dust cleaning mechanism 7 and a dust collection mechanism 6 are arranged in the inner cavity of the second inner chamber 4, and the dust collection mechanism 6 is located below the dust cleaning mechanism 7. A waste heat recovery mechanism 8 is arranged in the inner cavity of the third inner chamber 5. A single-chip microcomputer 14 is installed at the bottom of the box body 1, and the single-chip microcomputer 14 is connected to the dust cleaning mechanism 7 for control.

[0042] As Figure 1 shown, a first water inlet pipe 11 is arranged at the top of the left side wall of the box body 1. The input end of the first water inlet pipe 11 is connected to an external water supply device through a conduit. A first water outlet pipe 12 is arranged at the bottom of the left side wall of the box body 1. The output end of the first water outlet pipe 12 is connected to an external hot water storage device through a conduit. Both the first water inlet pipe 11 and the first water outlet pipe 12 are connected to the inner cavity of the first inner chamber 3. A first electromagnetic valve and a second electromagnetic valve are respectively arranged on the first water inlet pipe 11 and the first water outlet pipe 12. In the state where the second electromagnetic valve is closed and the first electromagnetic valve is opened, first inject some water into the inner cavity of the first inner chamber 3 through the first water inlet pipe 11, and then close the first electromagnetic valve.

[0043] As Figure 1 and Figure 2 shown, a circulation mechanism 2 is arranged at the top of the box body 1. A circulation water pipe 18 is arranged at the bottom of the rear side wall of the inner cavity of the first inner chamber 3. The circulation mechanism 2 includes a water pump 201 and a sprayer 202. The water pump 201 is electrically connected to the input end of the single-chip microcomputer 14. The output end of the water pump 201 is connected to the input end of the sprayer 202 through a conduit. The input end of the water pump 201 is connected to the output end of the circulation water pipe 18 passing through the rear side wall of the box body 1 externally through a conduit. The output end of the sprayer 202 extends into the inner cavity of the first inner chamber 3. When the flue gas is initially conveyed from the input end to the output end of the exhaust gas pipe 9, it passes through the first inner chamber 3. At this time, the temperature of the flue gas is relatively high. The water pump 201 works to pump the water stored at the bottom of the first inner chamber 3 out from the circulation water pipe 18 and convey it to the sprayer 202. The sprayer 202 sprays the water outside the exhaust gas pipe 9, and the sprayed water returns to the bottom of the inner cavity of the first inner chamber 3 again. While the water is in flowing contact with the exhaust gas pipe 9, the water is also recycled, and sufficient heat exchange is carried out, so as to carry out the first waste heat recovery.

[0044] As Figure 1 shown, the first solenoid valve and the second solenoid valve are electrically input-connected to the single-chip microcomputer 14. A first temperature control switch 13 is provided at the bottom of the box body 1. The top sensing end of the first temperature control switch 13 extends into the bottom end of the inner cavity of the first inner chamber 3. The first temperature control switch 13 is electrically output-connected to the single-chip microcomputer 14. When the first waste heat recovery work is carried out in the first inner chamber 3, the temperature of the water source in the first inner chamber 3 is sensed in real time through the first temperature control switch 13. When the temperature of the water source in the first inner chamber 3 reaches the water temperature value of the hot water set by the first temperature control switch 13, a signal is transmitted to the single-chip microcomputer 14. The single-chip microcomputer 14 controls the water pump 201 to stop working, and then controls the second solenoid valve to open, so as to discharge the hot water in the first inner chamber 3 from the first water outlet pipe 12 for recovery by an external hot water storage device. After a period of time, the second solenoid valve is closed, the first solenoid valve is opened, and cold water source is input into the first inner chamber 3 again. Then, the water pump 201 is controlled to work again, and the waste heat recovery work is carried out on the flue gas conveyed in the smoke guide cylinder 9 in the first inner chamber 3 again.

[0045] As Figure 3 and Figure 4 shown, a forward and reverse motor 19 is provided on the rear side wall of the box body 1. The dust cleaning mechanism 7 includes a support strip plate 703, a first pressure sensor 701 and a second pressure sensor 704. The first pressure sensor 701 is installed at the rear side of the top of the inner cavity of the second inner chamber 4. A cleaning brush 702 is fixedly connected to the right side wall of the support strip plate 703. The second pressure sensor 704 is installed at the rear side of the bottom of the inner cavity of the second inner chamber 4, and the second pressure sensor 704 is located above the dust collection mechanism 6. The forward and reverse motor 19 is electrically input-connected to the single-chip microcomputer 14. The first pressure sensor 701 and the second pressure sensor 704 are electrically output-connected to the single-chip microcomputer 14.

[0046] As Figure 3 and Figure 4As shown in the figure, drive chains 707 are fixedly connected to both the front and rear ends of the left side wall of the support strip plate 703. Shaft rods 705 are arranged at both the upper and lower ends on the left side of the support strip plate 703. The shaft rods 705 are rotatably connected to the box body 1. The power output end of the forward and reverse motor 19 is connected to one end of the upper shaft rod 705 that penetrates the rear side wall of the box body 1. Both the upper and lower sides inside the cavity of the drive chain 707 are drivingly connected with gears 706, and the gears 706 are fixedly connected to the corresponding shaft rods 705. After the flue gas undergoes primary waste heat recovery, it is conveyed from the smoke guiding cylinder 9 to the dust filter net 10. The dust in the flue gas is removed by the dust filter net 10 through virtual filtration. Then, the shaft rod 705 connected to the controller of the forward and reverse motor 19 rotates. Through the driving connection between the gear 706 and the drive chain 707, the two drive chains 707 are driven to convey synchronously, thereby driving the support strip plate 703 to move up and down. When the support strip plate 703 moves up and down, the surface of the dust filter net 10 is scraped by the cleaning brush 702 thereon, and the dust filtered out by the dust filter net 10 is cleaned off from it. At the same time, when the support strip plate 703 moves downward and contacts and presses the second pressure sensor 704, the second pressure sensor 704 transmits a signal to the single-chip microcomputer 14. The single-chip microcomputer 14 controls the forward and reverse motor 19 to rotate in the reverse direction, driving the support strip plate 703 to move upward. When the support strip plate 703 moves upward and contacts and presses the first pressure sensor 701, the first pressure sensor 701 transmits a signal to the single-chip microcomputer 14. The single-chip microcomputer 14 then controls the forward and reverse motor 19 to rotate in the reverse direction again, thereby controlling the forward and reverse motor 19 to rotate back and forth in the forward and reverse directions, driving the support strip plate 703 to continuously move up and down, enabling the cleaning brush 702 thereon to clean the surface dust of the dust filter net 10 in a timely manner, reducing the situation where the dust filter net 10 is blocked.

[0047] As Figure 1 and Figure 5 shown, the dust collection mechanism 6 includes a dust collection base 601 and a bent pipe 603. The dust collection base 601 is installed at the bottom of the inner cavity of the first inner chamber 3. The second pressure sensor 704 is located at the rear side of the top of the dust collection base 601. A dust guiding groove 602 is opened at the top of the dust collection base 601, which is convenient for receiving the cleaned dust. The bent pipe 603 is fixedly connected to the bottom of the box body 1. The input end of the bent pipe 603 is communicated with the bottom of the inner cavity of the dust guiding groove 602. The dust guiding groove 602 is in a funnel shape, which is convenient for conveying the received dust to the input end of the bent pipe 603. The output end of the bent pipe 603 is screwed with a dust collection cylinder 604, which is convenient for finally collecting the soot cleaned from the dust filter net 10. And due to the screwing connection between the dust collection cylinder 604 and the bent pipe 603, it is convenient to disassemble the dust collection cylinder 604, facilitating the cleaning of the collected dust. At the same time, due to the bending property of the bent pipe 603 itself, the dust collection cylinder 604 deviates from the vertical direction, facilitating disassembly and installation.

[0048] As shown Figure 1 In the figure, a second water inlet pipe 15 is provided on the right side of the top of the box body 1. The input end of the second water inlet pipe 15 is also connected to an external water supply device through a conduit. A second water outlet pipe 16 is provided at the bottom of the right side wall of the box body 1. The output end of the second water outlet pipe 16 is connected to an external warm water storage device through a conduit. Both the second water inlet pipe 15 and the second water outlet pipe 16 are connected to the inner cavity of the third inner chamber 5. A third solenoid valve and a fourth solenoid valve are respectively provided on the second water inlet pipe 15 and the second water outlet pipe 16. The third solenoid valve and the fourth solenoid valve are electrically connected to the input of the single-chip microcomputer 14. First, close the fourth solenoid valve and open the third solenoid valve. Fill the third inner chamber 5 with water through the second water inlet pipe 15 first, and then close the third solenoid valve.

[0049] As shown Figure 6 , Figure 7 and Figure 8 In the figure, the waste heat recovery mechanism 8 includes a waste heat recovery pipe group 801 and a smoke guiding hood 802. The smoke guiding hood 802 is fixedly connected to the left side wall of the inner cavity of the third inner chamber 5, and the left side of the inner cavity of the smoke guiding hood 802 corresponds to the position of the dust filter net 10. A smoke guiding groove 803 is opened at the bottom of the inner cavity of the smoke guiding hood 802. The bottom of the smoke guiding hood 802 is connected to a smoke guiding pipe 804 through the smoke guiding groove 803. After the flue gas is filtered, it enters the smoke guiding hood 802. The smoke guiding groove 803 has the same structure as the dust guiding groove 602, which is convenient for guiding the filtered flue gas in the smoke guiding hood 802 to the smoke guiding pipe 804 for flow and transportation.

[0050] As shown Figure 6 , Figure 7 and Figure 8 In the figure, the waste heat recovery pipe group 801 is composed of several groups of spiral pipes 8012 sleeved on each other from the inside to the outside in sequence. The top output end of the outermost spiral pipe 8012 is connected to a smoke outlet pipe 8013. The smoke outlet pipe 8013 is installed on the right side wall of the box body 1. The bottom input end of the innermost spiral pipe 8012 is connected to a smoke inlet pipe 8011. The heads and tails of adjacent two groups of spiral pipes 8012 are connected to each other. The output end of the smoke guiding pipe 804 is connected to the smoke inlet pipe 8011, which is convenient for guiding the flue gas from the smoke guiding pipe 804 to the smoke inlet pipe 8011 for flow and transportation. When the heads and tails of adjacent two groups of spiral pipes 8012 are connected to each other, finally, the flue gas flows and transports in a spiral manner in several groups of spiral pipes 8012, so that the flue gas fully recovers the secondary waste heat with the water source in the third inner chamber 5 in the third inner chamber 5, and finally discharges from the smoke outlet pipe 8013. Through the primary waste heat recovery and secondary waste heat recovery work, it is convenient to obtain water sources with different water temperatures and meet the needs of using water sources with different water temperatures.

[0051] As shown Figure 1As shown in the figure, a second temperature control switch 17 is provided at the bottom of the box body 1. The top sensing end of the second temperature control switch 17 extends into the bottom end of the inner cavity of the third inner chamber 5. The second temperature control switch 17 is electrically connected to the single-chip microcomputer 14. When the secondary waste heat recovery of the flue gas is carried out in the third inner chamber 5, the temperature of the water source in the third inner chamber 5 is sensed in real time through the second temperature control switch 17. When the temperature of the water source in the third inner chamber 5 reaches the warm water temperature value set by the second temperature control switch 17, a signal is sent to the single-chip microcomputer 14. The fourth solenoid valve is controlled to open through the single-chip microcomputer 14, and the warm water that has absorbed heat in the third inner chamber 5 is discharged through the second water outlet pipe 16 and collected by an external warm water storage device. Then the fourth solenoid valve is closed, the third solenoid valve is opened, the water source is filled into the third inner chamber 5 again through the second water inlet pipe 15, and then the third solenoid valve is closed, and the secondary waste heat recovery work of the flue gas is repeated.

[0052] Working principle:

[0053] The flue gas is drained and conveyed to the dust filter screen 10 through the smoke guide cylinder 9. When it is conveyed in the smoke guide cylinder 9, first, in the first inner chamber 3, a circulating water source is generated by the circulating mechanism 2 in cooperation with the circulating water pipe 18 for heat exchange with the heat of the flue gas in the smoke guide cylinder 9, so as to carry out the primary waste heat recovery of the flue gas. When the flue gas is conveyed to the dust filter screen 10, the flue gas is adsorbed and filtered by the dust filter screen 10. Then, the reciprocating movement of the forward and reverse rotation motor 19 drives the cleaning brush 702 in the dust cleaning mechanism 7 to move up and down to clean the surface of the dust filter screen 10 to remove dust. The fallen dust is collected and cleaned by the dust collection mechanism 6. After the flue gas is filtered, it enters the smoke guide cover 802 in the third inner chamber 5, and then enters the waste heat recovery pipe group 801, and is spirally conveyed through the respective communicating spiral pipes 8012 therein, extending the conveying time of the flue gas in the third inner chamber 5, so that the flue gas undergoes a long-time secondary waste heat recovery in the third inner chamber 5. Finally, the flue gas is discharged from the smoke outlet pipe 8013, which is convenient for waste heat recovery of the flue gas and also convenient for cleaning the dust in the flue gas, reducing the possibility of the dust in the flue gas blocking the pipeline.

[0054] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A flue gas waste heat recovery system for a thermal power plant, comprising a box body (1), characterized in that: The inner cavity of the box body (1) is successively partitioned from left to right into a first inner chamber (3), a second inner chamber (4) and a third inner chamber (5) by two groups of partition plates. A dust filter screen (10) is arranged between the second inner chamber (4) and the third inner chamber (5), and the dust filter screen (10) is fitted and installed on a group of partition plates; An exhaust pipe (9) is arranged in the inner cavity of the first inner chamber (3). The input end of the exhaust pipe (9) penetrates through the left side wall of the box body (1), and the output end of the exhaust pipe (9) extends into the inner cavity of the second inner chamber (4). A dust cleaning mechanism (7) and a dust collection mechanism (6) are arranged in the inner cavity of the second inner chamber (4), and the dust collection mechanism (6) is located below the dust cleaning mechanism (7). A waste heat recovery mechanism (8) is arranged in the inner cavity of the third inner chamber (5). A single-chip microcomputer (14) is installed at the bottom of the box body (1), and the single-chip microcomputer (14) is connected to the dust cleaning mechanism (7) in a control manner; A forward and reverse motor (19) is arranged on the rear side wall of the box body (1). The dust cleaning mechanism (7) includes a support strip plate (703), a first pressure sensor (701) and a second pressure sensor (704). The first pressure sensor (701) is installed at the rear side of the top of the inner cavity of the second inner chamber (4). A cleaning brush (702) is fixedly connected to the right side wall of the support strip plate (703). The second pressure sensor (704) is installed at the rear side of the bottom of the inner cavity of the second inner chamber (4), and the second pressure sensor (704) is located above the dust collection mechanism (6). The forward and reverse motor (19) is electrically connected to the single-chip microcomputer (14) in an input manner, and the first pressure sensor (701) and the second pressure sensor (704) are electrically connected to the single-chip microcomputer (14) in an output manner; Drive chains (707) are fixedly connected to both the front and rear ends of the left side wall of the support strip plate (703). Shaft rods (705) are arranged at both the upper and lower ends of the left side of the support strip plate (703). The shaft rods (705) are rotatably connected to the box body (1). The power output end of the forward and reverse motor (19) is connected to one end of the upper shaft rod (705) penetrating through the rear side wall of the box body (1). Both the upper and lower sides of the inner cavity of the drive chain (707) are drivingly connected with gears (706), and the gears (706) are fixedly connected to the corresponding shaft rods (705); The waste heat recovery mechanism (8) includes a waste heat recovery pipe group (801) and a smoke guide cover (802). The waste heat recovery pipe group (801) is composed of several groups of spiral pipes (8012) sleeved successively from inside to outside. The top output end of the outermost spiral pipe (8012) is communicated with a smoke outlet pipe (8013), and the smoke outlet pipe (8013) is installed on the right side wall of the box body (1). The bottom input end of the innermost spiral pipe (8012) is communicated with a smoke inlet pipe (8011), and the adjacent two groups of spiral pipes (8012) are connected end to end.

2. The flue gas waste heat recovery system of a thermal power plant according to claim 1, characterized in that: A circulation mechanism (2) is provided at the top of the box body (1). A circulation water pipe (18) is provided at the bottom of the rear side wall of the inner cavity of the first inner chamber (3). The circulation mechanism (2) includes a water pump (201) and a sprayer (202). The water pump (201) is electrically connected to the input of the single-chip microcomputer (14). The output end of the water pump (201) is connected to the input end of the sprayer (202) through a conduit. The input end of the water pump (201) is connected to the output end of the circulation water pipe (18) passing through the outer part of the rear side wall of the box body (1) through a conduit. The output end of the sprayer (202) extends into the inner cavity of the first inner chamber (3).

3. A flue gas waste heat recovery system for a thermal power plant according to claim 1, characterized in that: A first water inlet pipe (11) is provided at the top of the left side wall of the box body (1). A first water outlet pipe (12) is provided at the bottom of the left side wall of the box body (1). A first electromagnetic valve and a second electromagnetic valve are respectively provided on the first water inlet pipe (11) and the first water outlet pipe (12). The first electromagnetic valve and the second electromagnetic valve are electrically connected to the input of the single-chip microcomputer (14). A first temperature control switch (13) is provided at the bottom of the box body (1). The top sensing end of the first temperature control switch (13) extends into the bottom end of the inner cavity of the first inner chamber (3). The first temperature control switch (13) is electrically connected to the output of the single-chip microcomputer (14).

4. A flue gas waste heat recovery system for a thermal power plant according to claim 1, characterized in that: A second water inlet pipe (15) is provided at the top right side of the box body (1). A second water outlet pipe (16) is provided at the bottom of the right side wall of the box body (1). A third electromagnetic valve and a fourth electromagnetic valve are respectively provided on the second water inlet pipe (15) and the second water outlet pipe (16). The third electromagnetic valve and the fourth electromagnetic valve are electrically connected to the input of the single-chip microcomputer (14). A second temperature control switch (17) is provided at the bottom of the box body (1). The top sensing end of the second temperature control switch (17) extends into the bottom end of the inner cavity of the third inner chamber (5). The second temperature control switch (17) is electrically connected to the output of the single-chip microcomputer (14).

5. A flue gas waste heat recovery system for a thermal power plant according to claim 1, characterized in that: The dust collection mechanism (6) includes a dust collection seat (601) and a bent pipe (603). A dust guide groove (602) is formed at the top of the dust collection seat (601). The bent pipe (603) is fixedly connected to the bottom of the box body (1). The input end of the bent pipe (603) is connected to the bottom of the inner cavity of the dust guide groove (602). A dust collection cylinder (604) is screwed to the output end of the bent pipe (603).

6. The flue gas waste heat recovery system of a thermal power plant according to claim 1, characterized in that: The smoke guiding hood (802) is fixedly connected to the left side wall of the inner cavity of the third inner chamber (5), and the left side of the inner cavity of the smoke guiding hood (802) corresponds to the position of the dust filter net (10). A smoke guide groove (803) is formed at the bottom of the inner cavity of the smoke guiding hood (802). A smoke guide pipe (804) is connected to the bottom of the smoke guiding hood (802) through the smoke guide groove (803), and the output end of the smoke guide pipe (804) is connected to the smoke inlet pipe (8011).

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