A high-pressure and high-temperature resistant flue gas spray cooling system

Abstract

A high-pressure, high-temperature resistant flue gas spray cooling system includes a water storage tank, a drainage tank, a variable frequency water pump, and a spraying device. The inlet of the variable frequency water pump is connected to the water storage tank via a pipe. The spraying device includes an inner pipe and an outer pipe. A cavity is formed between the inner pipe, the outer pipe, the inlet flange, and the outlet flange. The inlet flange has multiple first cooling holes communicating with the cavity along its radial direction, and the outlet flange has multiple second cooling holes communicating with the cavity along its radial direction. The spraying device also includes a cooling water inlet pipe, a cooling water outlet pipe, a main spraying assembly, and a secondary spraying assembly. In this application, water enters from the cooling water inlet pipe into the first cooling holes to cool the inlet flange, then enters the cavity, flows along a spiral guide bar in the cavity to cool the inner and outer pipes, and finally enters the second cooling holes to cool the outlet flange, enabling the spraying device to operate in high-temperature flue gas above 2200℃.

Description

Technical Field

[0001] This application relates to the field of high-temperature flue gas spray cooling technology, and in particular to a high-pressure, high-temperature flue gas spray cooling system. Background Technology

[0002] Currently, many industries generate high-temperature and high-pressure flue gas, which requires cooling treatment.

[0003] Existing cooling systems operate in the lower temperature range of 500-1000℃, and rarely involve spray cooling of high-temperature flue gas above 2200℃. In high-temperature flue gas above 2200℃, the flanges of spray devices, in particular, cannot withstand the high temperature of 2200℃, which affects the application range of the cooling system.

[0004] Therefore, we propose a high-pressure and high-temperature resistant flue gas spray cooling system. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a high-pressure and high-temperature resistant flue gas spray cooling system. The first and second cooling holes of the cooling water cool the inlet flange, inner pipe, outer pipe and outlet flange. The water flows along the spiral guide strip in the cavity to cool the inner pipe and outer pipe, so that the spray device can work in high-temperature flue gas above 2200°C.

[0006] The technical solution adopted in this application is as follows:

[0007] A high-pressure, high-temperature resistant flue gas spray cooling system, comprising:

[0008] Water storage tank;

[0009] Drainage tank;

[0010] The variable frequency water pump has its inlet connected to the water storage tank via a pipe.

[0011] The spraying device includes an inner pipe and an outer pipe, one end of which is fixedly connected to the same inlet flange, and the other end of which is fixedly connected to the same outlet flange.

[0012] The system includes an inner pipe, an outer pipe, an inlet flange, and an outlet flange forming a cavity, within which a spiral guide strip is installed. The inlet flange has multiple first cooling holes communicating with the cavity along its radial direction, and the outlet flange has multiple second cooling holes communicating with the cavity along its radial direction. The spraying device also includes a cooling water inlet pipe, a cooling water outlet pipe, a main spraying assembly, and a secondary spraying assembly. The cooling water inlet pipe is connected to multiple first cooling holes via pipes, and the cooling water outlet pipe is connected to multiple second cooling holes via pipes.

[0013] The outlet of the variable frequency water pump is connected to the cooling water inlet pipe, the main spray assembly, and the secondary spray assembly via pipes, and the cooling water outlet pipe is connected to the drain tank via pipes.

[0014] Its further features are:

[0015] The main spray assembly includes a main spray water pipe and multiple main spray nozzles. The main spray nozzles pass through an inner pipe and an outer pipe. One end of the main spray nozzle is located inside the inner pipe, and the other end of the main spray nozzle is connected to the main spray water pipe. The main spray water pipe is connected to the outlet of the variable frequency water pump.

[0016] The secondary spray assembly includes a secondary spray water pipe and multiple secondary spray nozzles. The secondary spray nozzles pass through an inner pipe and an outer pipe. One end of the secondary spray nozzle is located inside the inner pipe, and the other end of the secondary spray nozzle is connected to the secondary spray water pipe. The secondary spray water pipe is connected to the outlet of the variable frequency water pump.

[0017] One side of the spiral guide bar is sealed to the inner tube, and the other side of the spiral guide bar is sealed to the outer tube.

[0018] The spraying device is installed in the flue gas duct through the inlet flange and the outlet flange. A third pressure sensor and a third temperature sensor are installed on the side of the flue gas duct near the inlet flange, and a fourth pressure sensor and a fourth temperature sensor are installed on the side of the flue gas duct near the outlet flange.

[0019] The inlet of the variable frequency water pump is connected to the first shut-off valve through a pipe. The other end of the first shut-off valve is connected to the water storage tank through a pipe. The outlet of the variable frequency water pump is connected to the inlet of the one-way valve and the first safety valve through pipes. The other end of the first safety valve is connected to the water storage tank through a pipe. The outlet of the one-way valve is connected to the first control valve, the second control valve and the third control valve through pipes. The first control valve is connected to the inlet flow meter through a pipe. The inlet flow meter is connected to the cooling water inlet pipe through a pipe.

[0020] The second control valve is connected to the main spray water pipe through a pipe, the third control valve is connected to the secondary spray water pipe through a pipe, the cooling water outlet pipe is connected to the drainage flow meter through a pipe, the other end of the drainage flow meter is connected to the back pressure valve through a pipe, the other end of the back pressure valve is connected to the drainage tank through a pipe, the drainage tank is connected to the second shut-off valve and the third shut-off valve through pipes respectively, one end of the second safety valve is connected to the pipe between the cooling water outlet pipe and the drainage flow meter through a pipe, and the other end of the second safety valve is connected to the pipe between the back pressure valve and the drainage tank through a pipe.

[0021] The pipeline between the first shut-off valve and the variable frequency water pump is connected to the inlet of the standby variable frequency water pump, and the outlet of the standby variable frequency water pump is connected to the outlet of the variable frequency water pump through a pipeline. The standby frequency converter is electrically connected to the standby variable frequency water pump. One end of the bypass valve is connected to the outlet of the variable frequency water pump and the standby variable frequency water pump through a pipeline, and the other end of the bypass valve is connected to the pipeline between the first shut-off valve and the standby variable frequency water pump through a pipeline.

[0022] A first pressure sensor and a first temperature sensor are installed on the pipe between the inlet flow meter and the cooling water inlet pipe, and a second pressure sensor and a second temperature sensor are installed on the pipe connecting the cooling water outlet pipe and the drain flow meter.

[0023] The frequency converter is electrically connected to the frequency converter water pump. The bypass valve, the first control valve, the inlet flow meter, the frequency converter, the standby frequency converter, the first pressure sensor, the first temperature sensor, the second pressure sensor, the second temperature sensor, the third pressure sensor, the third temperature sensor, the fourth pressure sensor, the fourth temperature sensor, the second control valve, the third control valve, the drain flow meter, and the back pressure valve are all electrically connected to the control system terminal.

[0024] The beneficial effects of this application are as follows:

[0025] This application features a compact and reasonable structure, and is easy to operate. A variable frequency water pump delivers water from the storage tank to the cooling water inlet pipe, main spray pipe, and secondary spray pipe. Water enters the first cooling hole from the cooling water inlet pipe to cool the inlet flange, then enters the cavity from the first cooling hole. Within the cavity, the water flows along the spiral guide strip, cooling the inner and outer pipes. The water then enters the second cooling hole to cool the outlet flange, and then flows from the second cooling hole into the cooling water outlet pipe, from which it flows into the drain tank. By cooling the inlet flange, inner pipe, outer pipe, and outlet flange, the spray device can operate in high-temperature flue gas exceeding 2200℃.

[0026] In addition, this application also has the following advantages:

[0027] (1) Water in the main spray pipe is sprayed out from the main spray nozzle to cool the high-temperature and high-pressure flue gas. Water in the secondary spray pipe is sprayed out from the secondary spray nozzle to cool the high-temperature and high-pressure flue gas. The flue gas is cooled in a range by the cooperation of the main spray nozzle and the secondary spray nozzle.

[0028] (2) One side of the spiral guide bar is sealed to the inner tube, and the other side of the spiral guide bar is sealed to the outer tube. This allows the water in the cavity to flow completely along the spiral guide bar, facilitating continuous cooling of the inner and outer tubes as a whole. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the sprinkler system described in this application. Figure 1 .

[0030] Figure 2 This is a schematic diagram of the spraying device of this application.

[0031] Figure 3 for Figure 2 The main view.

[0032] Figure 4 for Figure 3 Schematic diagram of the AA section.

[0033] Figure 5 for Figure 3 Schematic diagram of the cross-section of BB.

[0034] Figure 6 for Figure 5 Enlarged diagram of point C in the middle.

[0035] Figure 7 This is a schematic diagram of the spiral guide bar of this application.

[0036] Figure 8 This is a schematic diagram of the sprinkler system described in this application. Figure 2 .

[0037] The system comprises: 1. Water storage tank; 2. First shut-off valve; 3. Variable frequency water pump; 4. Variable frequency drive; 5. Sprinkler device; 6. Check valve; 7. Drainage tank; 8. First control valve; 9. First safety valve; 10. Inlet flow meter; 11. First pressure sensor; 12. First temperature sensor; 13. Second pressure sensor; 14. Second temperature sensor; 15. Second control valve; 16. Third control valve; 17. Drainage flow meter; 18. Back pressure valve; 19. Second safety valve; 20. Third pressure sensor; 21. Third temperature sensor; 22. Fourth pressure sensor; 23. Fourth temperature sensor; 24. Second shut-off valve; 25. Control system terminal; 26. Backup variable frequency water pump; 27. Backup variable frequency drive; 28. Bypass valve; 29. ​​Third shut-off valve.

[0038] 501. Cooling water inlet pipe; 502. Cooling water outlet pipe; 503. Spiral guide strip; 504. Cavity; 505. Main spray water pipe; 506. Secondary spray water pipe; 507. Main spray nozzle; 508. Secondary spray nozzle; 509. Inner pipe; 510. Outer pipe; 511. Inlet flange; 512. Outlet flange;

[0039] 5111, First cooling hole;

[0040] 5121, Second cooling hole. Detailed Implementation

[0041] The specific embodiments of this application are described below with reference to the accompanying drawings.

[0042] like Figures 1-7 As shown, a high-pressure and high-temperature resistant flue gas spray cooling system includes a water storage tank 1, a variable frequency water pump 3, a spray device 5, and a drainage tank 7.

[0043] The inlet of the variable frequency water pump 3 is connected to the water storage tank 1 via a pipe. The water storage tank 1 stores the cooling water and spray water required by the spray device 5.

[0044] The spray device 5 includes an inner pipe 509 and an outer pipe 510. One end of the inner pipe 509 and the outer pipe 510 are fixedly connected to the same inlet flange 511, and the other end of the inner pipe 509 and the outer pipe 510 are fixedly connected to the same outlet flange 512. A cavity 504 is formed between the inner pipe 509, the outer pipe 510, the inlet flange 511 and the outlet flange 512. A spiral guide strip 503 is provided in the cavity 504.

[0045] The inlet flange 511 is provided with a plurality of first cooling holes 5111 communicating with the cavity 504 in the radial direction, and the outlet flange 512 is provided with a plurality of second cooling holes 5121 communicating with the cavity 504 in the radial direction.

[0046] The spray device 5 also includes a cooling water inlet pipe 501 and a cooling water outlet pipe 502. The cooling water inlet pipe 501 is connected to a plurality of first cooling holes 5111 through pipes, and the cooling water outlet pipe 502 is connected to a plurality of second cooling holes 5121 through pipes.

[0047] The spraying device 5 also includes a main spraying assembly and a secondary spraying assembly. The main spraying assembly includes a main spraying water pipe 505 and a plurality of main spraying nozzles 507. The main spraying nozzles 507 pass through the inner pipe 509 and the outer pipe 510. One end of the main spraying nozzle 507 is located inside the inner pipe 509, and the other end of the main spraying nozzle 507 is connected to the main spraying water pipe 505.

[0048] The secondary spray assembly includes a secondary spray water pipe 506 and multiple secondary spray nozzles 508. The secondary spray nozzles 508 pass through an inner pipe 509 and an outer pipe 510. One end of the secondary spray nozzle 508 is located inside the inner pipe 509, and the other end of the secondary spray nozzle 508 is connected to the secondary spray water pipe 506.

[0049] The outlet of the variable frequency water pump 3 is connected to the cooling water inlet pipe 501, the main spray water pipe 505 and the secondary spray water pipe 506 through pipes respectively, and the cooling water outlet pipe 502 is connected to the drain box 7 through pipes.

[0050] Water from the storage tank 1 is pumped by the variable frequency water pump 3 to the cooling water inlet pipe 501, the main spray pipe 505, and the secondary spray pipe 506. Water enters the first cooling hole 5111 from the cooling water inlet pipe 501 to cool the inlet flange 511, and then enters the cavity 504 from the first cooling hole 5111. In the cavity 504, the water flows along the spiral guide bar 503 to cool the inner pipe 509 and the outer pipe 510. Then, the water enters the second cooling hole 5121 to cool the outlet flange 512, and then flows from the second cooling hole 5121 into the cooling water outlet pipe 502, and from the cooling water outlet pipe 502 into the drain tank 7.

[0051] The first cooling hole 5111 and the second cooling hole 5121 cool the inlet flange 511, inner pipe 509, outer pipe 510 and outlet flange 512, enabling the spray device 5 to work in high-temperature flue gas above 2200℃.

[0052] Cooling the inlet flange 511 and outlet flange 512 can effectively prevent them from overheating, allowing the spray device 5 to operate in high-temperature flue gas above 2200℃.

[0053] Water from the main spray pipe 505 is sprayed out from the main spray nozzle 507 to cool the high-temperature and high-pressure flue gas. Water from the secondary spray pipe 506 is sprayed out from the secondary spray nozzle 508 to cool the high-temperature and high-pressure flue gas. The combination of the main spray nozzle 507 and the secondary spray nozzle 508 achieves a range of cooling for the flue gas.

[0054] In one embodiment, one side of the spiral guide bar 503 is sealed to the inner tube 509, and the other side of the spiral guide bar 503 is sealed to the outer tube 510.

[0055] This allows the water in cavity 504 to flow completely along the spiral guide bar 503, facilitating continuous cooling of the inner tube 509 and outer tube 510 as a whole.

[0056] In one embodiment, such as Figure 8 As shown, the inlet of the variable frequency water pump 3 is connected to the first shut-off valve 2 via a pipe, and the other end of the first shut-off valve 2 is connected to the water storage tank 1 via a pipe. The water output is controlled by the first shut-off valve 2 and the water storage tank 1.

[0057] The frequency converter 4 is electrically connected to the frequency converter water pump 3. The frequency converter 4 controls the frequency converter water pump 3. The outlet of the frequency converter water pump 3 is connected to the inlet of the one-way valve 6 and the first safety valve 9 through pipes. The other end of the first safety valve 9 is connected to the water storage tank 1 through a pipe. The first safety valve 9 can prevent water hammer in the cooling water inlet pipe 501, which could cause damage to the system.

[0058] The outlet of the one-way valve 6 is connected to the first control valve 8, the second control valve 15 and the third control valve 16 through pipes respectively. The one-way valve 6 can prevent water backflow.

[0059] The first control valve 8 is connected to the inlet flow meter 10 through a pipeline, and the inlet flow meter 10 measures the amount of water supplied to the spray device 5.

[0060] The inlet flow meter 10 is connected to the cooling water inlet pipe 501 through a pipe. A first pressure sensor 11 and a first temperature sensor 12 are installed on the pipe between the inlet flow meter 10 and the cooling water inlet pipe 501. The inlet pressure and temperature of the cooling water are measured by the first pressure sensor 11 and the first temperature sensor 12.

[0061] The second control valve 15 is connected to the main spray water pipe 505 through a pipe, and the third control valve 16 is connected to the secondary spray water pipe 506 through a pipe.

[0062] The cooling water outlet pipe 502 is connected to the drain flow meter 17 via a pipe, and the drain flow meter 17 measures the cooling water discharge volume. A second pressure sensor 13 and a second temperature sensor 14 are installed on the pipe connecting the cooling water outlet pipe 502 and the drain flow meter 17, and the cooling water outlet pressure and temperature are measured by the second pressure sensor 13 and the second temperature sensor 14.

[0063] The other end of the drainage flow meter 17 is connected to the back pressure valve 18 via a pipe, and the other end of the back pressure valve 18 is connected to the drainage tank 7 via a pipe. The drainage tank 7 is connected to the second shut-off valve 24 and the third shut-off valve 29 via pipes respectively, and the other end of the second shut-off valve 24 is connected to the water storage tank 1 via a pipe.

[0064] One end of the second safety valve 19 is connected to the pipe between the cooling water outlet pipe 502 and the drain flow meter 17 via a pipe, and the other end of the second safety valve 19 is connected to the pipe between the back pressure valve 18 and the drain tank 7 via a pipe. The pressure of the cooling water is adjusted to the required range by the back pressure valve 18.

[0065] The pipe between the first shut-off valve 2 and the variable frequency water pump 3 is connected to the inlet of the standby variable frequency water pump 26. The outlet of the standby variable frequency water pump 26 is connected to the outlet of the variable frequency water pump 3 through the pipe. The standby frequency converter 27 is electrically connected to the standby variable frequency water pump 26 and controls the standby variable frequency water pump 26 through the standby frequency converter 27.

[0066] One end of the bypass valve 28 is connected to the outlet of the variable frequency water pump 3 and the standby variable frequency water pump 26 through a pipe, and the other end of the bypass valve 28 is connected to the pipe between the first shut-off valve 2 and the standby variable frequency water pump 26 through a pipe.

[0067] The spray device 5 is installed in the flue gas duct through the inlet flange 511 and the outlet flange 512. The flue gas enters from the inlet flange 511 side. A third pressure sensor 20 and a third temperature sensor 21 are installed on the side of the flue gas duct near the inlet flange 511. The third pressure sensor 20 and the third temperature sensor 21 measure the flue gas pressure and temperature at the inlet of the spray device 5. A fourth pressure sensor 22 and a fourth temperature sensor 23 are installed on the side of the flue gas duct near the outlet flange 512. The fourth pressure sensor 22 and the fourth temperature sensor 23 measure the flue gas pressure and temperature at the outlet of the spray device 5.

[0068] Bypass valve 28, first control valve 8, inlet flow meter 10, frequency converter 4, standby frequency converter 27, first pressure sensor 11, first temperature sensor 12, second pressure sensor 13, second temperature sensor 14, third pressure sensor 20, third temperature sensor 21, fourth pressure sensor 22, fourth temperature sensor 23, second control valve 15, third control valve 16, drain flow meter 17, and back pressure valve 18 are all electrically connected to the control system terminal 25. The control system terminal 25 collects the measured values ​​and can remotely control the spray cooling system to achieve the set cooling effect for the high-temperature flue gas.

[0069] The above description is an explanation of this application and not a limitation thereof. The scope of this application is defined by the claims. Any modifications may be made within the scope of protection of this application.

Claims

1. A high-pressure, high-temperature resistant flue gas spray cooling system, characterized in that, include: Water storage tank (1); Drainage tank (7); The variable frequency water pump (3) has its inlet connected to the water storage tank (1) via a pipe. The spraying device (5) includes an inner pipe (509) and an outer pipe (510). One end of the inner pipe (509) and the outer pipe (510) are fixedly connected to the same inlet flange (511), and the other end of the inner pipe (509) and the outer pipe (510) are fixedly connected to the same outlet flange (512). Among them, an inner pipe (509), an outer pipe (510), an inlet flange (511), and an outlet flange (512) form a cavity (504), and a spiral guide strip (503) is provided in the cavity (504); the inlet flange (511) is provided with a plurality of first cooling holes (5111) communicating with the cavity (504) in the radial direction, and the outlet flange (512) is provided with a plurality of second cooling holes (5121) communicating with the cavity (504) in the radial direction; the spray device (5) also includes a cooling water inlet pipe (501), a cooling water outlet pipe (502), a main spray assembly, and a secondary spray assembly; the cooling water inlet pipe (501) is connected to a plurality of first cooling holes (5111) through pipes respectively, and the cooling water outlet pipe (502) is connected to a plurality of second cooling holes (5121) through pipes respectively; The outlet of the variable frequency water pump (3) is connected to the cooling water inlet pipe (501), the main spray assembly and the secondary spray assembly through pipes respectively, and the cooling water outlet pipe (502) is connected to the drain tank (7) through pipes.

2. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 1, characterized in that: The main spray assembly includes a main spray water pipe (505) and multiple main spray nozzles (507). The main spray nozzles (507) pass through the inner pipe (509) and the outer pipe (510). One end of the main spray nozzle (507) is located inside the inner pipe (509), and the other end of the main spray nozzle (507) is connected to the main spray water pipe (505). The main spray water pipe (505) is connected to the outlet of the variable frequency water pump (3).

3. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 1, characterized in that: The secondary spray assembly includes a secondary spray water pipe (506) and multiple secondary spray nozzles (508). The secondary spray nozzles (508) pass through the inner pipe (509) and the outer pipe (510). One end of the secondary spray nozzle (508) is located inside the inner pipe (509), and the other end of the secondary spray nozzle (508) is connected to the secondary spray water pipe (506). The secondary spray water pipe (506) is connected to the outlet of the variable frequency water pump (3).

4. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 1, characterized in that: One side of the spiral guide bar (503) is sealed to the inner tube (509), and the other side of the spiral guide bar (503) is sealed to the outer tube (510).

5. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 1, characterized in that: The spray device (5) is installed in the flue gas duct through the inlet flange (511) and the outlet flange (512). A third pressure sensor (20) and a third temperature sensor (21) are provided on the side of the flue gas duct near the inlet flange (511), and a fourth pressure sensor (22) and a fourth temperature sensor (23) are provided on the side of the flue gas duct near the outlet flange (512).

6. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 5, characterized in that: The inlet of the variable frequency water pump (3) is connected to the first shut-off valve (2) through a pipe. The other end of the first shut-off valve (2) is connected to the water storage tank (1) through a pipe. The outlet of the variable frequency water pump (3) is connected to the inlet of the one-way valve (6) and the first safety valve (9) through pipes respectively. The other end of the first safety valve (9) is connected to the water storage tank (1) through a pipe. The outlet of the one-way valve (6) is connected to the first control valve (8), the second control valve (15) and the third control valve (16) through pipes respectively. The first control valve (8) is connected to the inlet flow meter (10) through a pipe. The inlet flow meter (10) is connected to the cooling water inlet pipe (501) through a pipe.

7. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 6, characterized in that: The second control valve (15) is connected to the main spray water pipe (505) through a pipe, the third control valve (16) is connected to the secondary spray water pipe (506) through a pipe, the cooling water outlet pipe (502) is connected to the drainage flow meter (17) through a pipe, the other end of the drainage flow meter (17) is connected to the back pressure valve (18) through a pipe, the other end of the back pressure valve (18) is connected to the drainage tank (7) through a pipe, the drainage tank (7) is connected to the second shut-off valve (24) and the third shut-off valve (29) through pipes respectively, one end of the second safety valve (19) is connected to the pipe between the cooling water outlet pipe (502) and the drainage flow meter (17) through a pipe, and the other end of the second safety valve (19) is connected to the pipe between the back pressure valve (18) and the drainage tank (7) through a pipe.

8. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 7, characterized in that: The pipe between the first shut-off valve (2) and the variable frequency water pump (3) is connected to the inlet of the standby variable frequency water pump (26), and the outlet of the standby variable frequency water pump (26) is connected to the outlet of the variable frequency water pump (3) through a pipe. The standby inverter (27) is electrically connected to the standby variable frequency water pump (26). One end of the bypass valve (28) is connected to the outlet of the variable frequency water pump (3) and the standby variable frequency water pump (26) through a pipe, and the other end of the bypass valve (28) is connected to the pipe between the first shut-off valve (2) and the standby variable frequency water pump (26) through a pipe.

9. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 8, characterized in that: A first pressure sensor (11) and a first temperature sensor (12) are installed on the pipe between the inlet flow meter (10) and the cooling water inlet pipe (501), and a second pressure sensor (13) and a second temperature sensor (14) are installed on the pipe connecting the cooling water outlet pipe (502) and the drain flow meter (17).

10. The high-pressure and high-temperature resistant flue gas spray cooling system as described in claim 9, characterized in that: The frequency converter (4) is electrically connected to the frequency converter water pump (3). The bypass valve (28), the first control valve (8), the inlet flow meter (10), the frequency converter (4), the standby frequency converter (27), the first pressure sensor (11), the first temperature sensor (12), the second pressure sensor (13), the second temperature sensor (14), the third pressure sensor (20), the third temperature sensor (21), the fourth pressure sensor (22), the fourth temperature sensor (23), the second control valve (15), the third control valve (16), the drain flow meter (17), and the back pressure valve (18) are all electrically connected to the control system terminal (25).

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