Flue gas waste heat recovery device

Abstract

This utility model discloses a flue gas waste heat utilization device, including a flue gas-water heat exchanger. One end of the flue gas-water heat exchanger is connected to a flue gas inlet pipe, and the other end is connected to a flue gas outlet pipe. A condensate drain outlet is provided at the end where the flue gas outlet pipe is located. A water inlet pipe box and a water outlet pipe box are fixed on one side of the flue gas-water heat exchanger. The water inlet pipe box is located on the side close to the flue gas outlet pipe. Multiple rows of tube bundles are spirally and inclinedly fixed inside the flue gas-water heat exchanger. One end of each of the multiple rows of tube bundles passes through the shell of the flue gas-water heat exchanger and is connected to the water inlet pipe box. The other end of each of the multiple rows of tube bundles passes through the shell of the flue gas-water heat exchanger and is connected to the water outlet pipe box. This utility model solves the problem of condensate collection in vertical flue gas-water heat exchangers by using spirally inclined tube bundles. The end where the flue gas outlet pipe is located is designed with an upward concave structure to facilitate condensate collection, and the end where the flue gas outlet pipe is located is designed with an upward convex structure to reduce flue gas resistance. The condensate drain outlet is provided to achieve periodic discharge of condensate and avoid corrosion and perforation.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat exchanger equipment and relates to a device for utilizing waste heat from flue gas. Background Technology

[0002] Currently, common waste heat recovery devices for boiler flue gas utilize a fan to introduce the high-temperature flue gas generated by the boiler through pipes into a separately installed flue gas heat exchanger, which is generally a shell-and-tube type. The shell side is for flue gas and the tube side is for water, providing continuous hot water for process heating or domestic heating. Some waste heat recovery devices install vertical flue gas heat exchangers directly above the boiler exhaust port, using the chimney's draft to allow the flue gas to pass directly through the heat exchanger shell and be further discharged into the atmosphere, while simultaneously heating the water in the tube side. This eliminates the need for an induced draft fan. However, in the operation of this type of vertical waste heat recovery device, the water vapor in the high-temperature flue gas will condense on the tube wall after encountering the low-temperature water in the tube side.

[0003] Current vertical flue gas heat exchangers do not consider the collection and discharge of condensate, which leads to condensate corrosion problems. There is currently no vertical flue gas waste heat utilization device for heating furnaces with condensate collection and discharge functions. Utility Model Content

[0004] The purpose of this invention is to provide a flue gas waste heat utilization device, which solves the problem that existing flue gas waste heat utilization devices are susceptible to corrosion by condensate.

[0005] The technical solution adopted in this utility model is a flue gas waste heat utilization device, including a flue gas water heat exchanger. One end of the flue gas water heat exchanger is connected to a flue gas inlet pipe, and the other end is connected to a flue gas outlet pipe. A condensate outlet is opened at the end where the flue gas outlet pipe is located. A water inlet pipe box and a water outlet pipe box are fixed on one side of the flue gas water heat exchanger. The water inlet pipe box is located on the side close to the flue gas outlet pipe. Multiple rows of tube bundles are spirally and inclinedly fixed inside the flue gas water heat exchanger. One end of each of the multiple rows of tube bundles passes through the shell of the flue gas water heat exchanger and is connected to the water inlet pipe box. The other end of each of the multiple rows of tube bundles passes through the shell of the flue gas water heat exchanger and is connected to the water outlet pipe box.

[0006] The features of this utility model also include: The flue gas inlet pipe of the flue gas heat exchanger has an upward concave structure, and the flue gas outlet pipe has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger, and the annular groove is positioned opposite to the condensate outlet.

[0007] Flanges are installed on both the flue gas inlet pipe and the flue gas outlet pipe.

[0008] The water inlet pipe box is provided with several first through holes. The number of first through holes is the same as the number of pipe bundle rows. One end of the pipe bundle is welded to the first through hole one by one.

[0009] The water outlet pipe box is provided with several second through holes. The number of second through holes is the same as the number of pipe bundle rows. One end of the pipe bundle is welded to the second through hole in a one-to-one correspondence.

[0010] Inside the flue water heat exchanger, there are guide plates fixed on both sides of the tube bundle. Several holes are opened on the guide plates, and each row of tube bundles is spirally arranged through the holes on the two guide plates.

[0011] The condensate drain outlet is connected to a condensate drain pipe, and a shut-off valve is installed on the condensate drain pipe.

[0012] One end of the water inlet pipe box is flanged and connected to the return water inlet pipe of the heating furnace, and a water inlet valve is installed on the return water inlet pipe of the heating furnace.

[0013] One end of the water outlet pipe box is flanged and connected to the return water outlet pipe of the heating furnace, and a water outlet valve is installed on the return water outlet pipe of the heating furnace.

[0014] A bypass pipe is connected between the return water inlet pipe and the return water outlet pipe of the heating furnace. A bypass valve is installed on the bypass pipe, which is located outside the water inlet valve and the water outlet valve.

[0015] A vent line is connected between the water inlet valve and the water inlet pipe box of the heating furnace return water inlet pipe, and a safety valve is installed on the vent line.

[0016] The shell of the flue water heat exchanger is square and made of Q235B material, while the tube bundle is made of bare tube and made of L245N material.

[0017] The deflector is made of Q235B.

[0018] The beneficial effects of this utility model are: 1. This utility model utilizes the design of inclined tube bundles to solve the problem of condensate collection in vertical flue gas heat exchangers. The design of the end where the flue gas outlet pipe is located is a convex structure, which helps to reduce flue gas resistance and improve practicality. 2. The inclined spiral structure of the tube bundle of this utility model allows condensate to fall along the tube wall of the tube bundle to the bottom of the shell, and the guide plate can support the tube bundle and guide the condensate. 3. This utility model uses a concave bottom structure design to collect condensate in an annular groove on the edge, and the condensate drain outlet can periodically discharge condensate from the condensate drain pipe, avoiding corrosion and perforation of the device and improving reliability; 4. The flue-water heat exchanger of this utility model can be directly installed above the flue gas outlet of the heating furnace without the need for other equipment. It is easy to install and implement. By setting up the flue-water heat exchanger, waste heat is utilized. The waste heat of the flue gas of the heating furnace is used to preheat the return water of the heating furnace, thereby improving the efficiency of the heating furnace, saving gas, and reducing carbon dioxide emissions. 5. This utility model can collect and discharge condensate during the flue gas waste heat recovery process, avoiding corrosion and perforation of the flue gas waste heat utilization device and improving the reliability of waste heat utilization. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a top view of the flue water heat exchanger in this utility model; Figure 3 The arrangement of the tube bundle in this utility model Figure 1 ; Figure 4 The arrangement of the tube bundle in this utility model Figure 2 .

[0020] In the diagram, 1. Flue gas heat exchanger, 2. Water inlet pipe box, 21. First through hole, 3. Water outlet pipe box, 31. Second through hole, 4. Flue gas inlet pipe, 5. Flue gas outlet pipe, 6. Condensate outlet, 7. Condensate outlet pipe, 8. Heating furnace return water inlet pipe, 9. Heating furnace return water outlet pipe, 10. Bypass pipe, 11. Shut-off valve, 12. Water inlet valve, 13. Water outlet valve, 14. Bypass valve, 15. Safety valve, 16. Drainage line, 17. Tube bundle, 18. Baffle plate. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] Flue gas waste heat recovery device, refer to Figure 1 The system includes a flue gas heat exchanger 1, with a flue gas inlet pipe 4 connected to one end and a flue gas outlet pipe 5 connected to the other end. A condensate drain outlet 6 is located at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed to one side of the flue gas heat exchanger 1. (Refer to...) Figure 2 The water inlet pipe box 2 is located on the side closest to the flue gas outlet pipe 5, as shown in the reference. Figure 3 The flue water heat exchanger 1 has multiple rows of tube bundles 17 fixed inside in a spiral inclination. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0023] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0024] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0025] The water inlet pipe box 2 has several first through holes 21. The number of first through holes 21 is the same as the number of rows of tube bundle 17. One end of tube bundle 17 is welded to the first through hole 21 in a one-to-one correspondence. The water inlet pipe box 2 is a water storage tank. The box body is fixedly connected to the flue water heat exchanger 1 by bolts.

[0026] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0027] Reference Figure 4 Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0028] Reference Figure 1 A condensate drain outlet 6 is connected to a condensate drain pipe 7, and a shut-off valve 11 is installed on the condensate drain pipe 7. A boiler return water inlet pipe 8 is connected to one end of the water inlet pipe box 2 via a flange, and a water inlet valve 12 is installed on the boiler return water inlet pipe 8. A boiler return water outlet pipe 9 is connected to one end of the water outlet pipe box 3 via a flange, and a water outlet valve 13 is installed on the boiler return water outlet pipe 9. A bypass pipe 10 is connected between the boiler return water inlet pipe 8 and the boiler return water outlet pipe 9, and a bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13, and is used for the flue water heat exchanger 1. In case of malfunction or maintenance, the waste heat utilization process is skipped; a venting line 16 is connected between the water inlet valve 12 of the heating furnace return water inlet pipe 8 and the water inlet pipe box 2. A safety valve 15 is installed on the venting line 16. The safety valve 15 is used for overpressure protection on the inlet side of the flue water heat exchanger 1. When the heating furnace return water inlet pipe 8 is overpressured, the safety valve 15 will open and release the liquid in the venting channel through the venting line 16 to reduce the pressure and protect the safety of the heating furnace return water inlet pipe 8; the shell of the flue water heat exchanger 1 is square and made of Q235B, the tube bundle 17 is a bare tube made of L245N, and the guide plate 18 is made of Q235B.

[0029] When the flue gas waste heat recovery device is in use, the flue gas inlet pipe 4 is connected to the flue gas outlet of the heating furnace via a flange, and the flue gas outlet pipe 5 is connected to the chimney via a flange. Simultaneously, the water inlet valve 12 and the water outlet valve 13 are opened, and the bypass valve 14 is closed. The heating furnace return water sequentially passes through the heating furnace return water inlet pipe 8 and the water inlet pipe box 2 before entering the multi-row tube bundle 17 and exchanging heat with the heating furnace flue gas. After absorbing heat from the flue gas and becoming heated, the heating furnace return water finally enters the heating furnace return water outlet pipe 9 through the water outlet pipe box 3, and then enters the heating furnace for further heating. The heating furnace flue gas enters the flue-water heat exchanger 1 from the flue gas inlet pipe 4, exchanges heat with the hot water in the tube bundle 17, and then exits from the flue gas outlet pipe 5. The water vapor in the flue gas is heated in the tube bundle 17. The condensate on the outer wall of the flue gas heat exchanger 1 condenses upon contact with cold air, collecting along the inclined tube bundle 17 to the lower side of the tube bundle 17, and is then guided by the guide plate 18 to the bottom of the flue gas heat exchanger 1. The condensate collects in the annular groove at the bottom edge of the flue gas heat exchanger 1 and is further discharged through the condensate outlet 6. When the condensate is discharged, the shut-off valve 11 on the condensate outlet pipe 7 is opened to drain the liquid. After the condensate is discharged, the shut-off valve 11 is closed to prevent flue gas leakage. The condensate collection and discharge design effectively prevents corrosion and perforation caused by the accumulation of condensate in the flue gas heat exchanger 1 and the chimney, significantly improving the reliability of the flue gas waste heat utilization device. One 1200kW horizontal heating furnace can provide a waste heat load of 30kW, which can utilize 5m³ of waste heat from the flue gas heat exchanger 1. 3 Raising the water temperature from 60℃ to 65℃ per hour can save approximately 25,000 cubic meters of natural gas per year.

[0030] If the pressure in the return water inlet pipe 8 of the heating furnace exceeds the set pressure of the safety valve 15 due to blockage of the tube bundle 17 in the flue water heat exchanger 1, the safety valve 15 will open and release the liquid in the channel through the venting pipeline 16 to reduce the pressure and protect the safety of the return water inlet pipe 8 of the heating furnace. When the flue water heat exchanger 1 malfunctions or is under maintenance, the water inlet valve 12 and the water outlet valve 13 will be closed and the bypass valve 14 will be opened. The return water of the heating furnace will return to the heating furnace from the bypass pipeline 10 for heating, bypassing the waste heat utilization process in the flue water heat exchanger 1, thus ensuring the normal operation of the heating furnace.

[0031] Example 1: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0032] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0033] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0034] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0035] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0036] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0037] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0038] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0039] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0040] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0041] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0042] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0043] Example 2: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0044] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0045] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0046] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0047] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0048] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0049] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0050] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0051] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0052] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0053] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0054] The deflector plate 18 is made of Q235B material.

[0055] Example 3: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0056] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0057] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0058] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0059] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0060] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0061] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0062] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0063] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0064] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0065] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0066] The deflector plate 18 is made of Q235B material.

[0067] Example 4: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0068] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0069] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0070] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0071] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0072] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0073] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0074] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0075] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0076] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0077] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0078] The deflector plate 18 is made of Q235B material.

[0079] Example 5: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0080] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0081] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0082] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0083] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0084] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0085] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0086] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0087] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0088] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0089] The deflector plate 18 is made of Q235B material.

[0090] Example 6: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0091] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0092] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0093] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0094] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0095] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0096] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0097] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0098] The deflector plate 18 is made of Q235B material.

[0099] Example 7: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0100] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0101] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0102] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0103] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0104] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0105] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0106] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0107] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0108] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0109] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0110] The deflector plate 18 is made of Q235B material.

[0111] Example 8: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0112] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0113] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0114] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0115] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0116] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0117] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0118] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0119] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0120] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0121] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0122] Example 9: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0123] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0124] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0125] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0126] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0127] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0128] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0129] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0130] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0131] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0132] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0133] The deflector plate 18 is made of Q235B material.

[0134] Example 10: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0135] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0136] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0137] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0138] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0139] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0140] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0141] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0142] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0143] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0144] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0145] The deflector plate 18 is made of Q235B material.

[0146] Example 11: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0147] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0148] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0149] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0150] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0151] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0152] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0153] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0154] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0155] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0156] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0157] The deflector plate 18 is made of Q235B material.

[0158] Example 12: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0159] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0160] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0161] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0162] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0163] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0164] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0165] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0166] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0167] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0168] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0169] The deflector plate 18 is made of Q235B material.

[0170] Example 13: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0171] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0172] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0173] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0174] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0175] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0176] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0177] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0178] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0179] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0180] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0181] The deflector plate 18 is made of Q235B material.

[0182] Example 14: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0183] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0184] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0185] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0186] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0187] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0188] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0189] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0190] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0191] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0192] The deflector plate 18 is made of Q235B material.

[0193] Example 15: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0194] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0195] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0196] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0197] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0198] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0199] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0200] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0201] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0202] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0203] The deflector plate 18 is made of Q235B material.

[0204] Example 16: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0205] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0206] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0207] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0208] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0209] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0210] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0211] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0212] The deflector plate 18 is made of Q235B material.

[0213] Example 17: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0214] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0215] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0216] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0217] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0218] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0219] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0220] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0221] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0222] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0223] Example 18: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0224] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0225] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0226] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0227] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0228] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0229] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0230] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0231] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0232] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0233] Example 19: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0234] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0235] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0236] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0237] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0238] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0239] The deflector plate 18 is made of Q235B material.

[0240] Example 20: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0241] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0242] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0243] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0244] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0245] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0246] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0247] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0248] Example 21: The flue gas waste heat utilization device includes a flue gas water heat exchanger 1. One end of the flue gas water heat exchanger 1 is connected to a flue gas inlet pipe 4, and the other end is connected to a flue gas outlet pipe 5. A condensate outlet 6 is opened at the end of the flue gas outlet pipe 5. A water inlet pipe box 2 and a water outlet pipe box 3 are fixed on one side of the flue gas water heat exchanger 1. The water inlet pipe box 2 is located on the side close to the flue gas outlet pipe 5. Multiple rows of tube bundles 17 are spirally and inclinedly fixed inside the flue gas water heat exchanger 1. One end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water inlet pipe box 2. The other end of each of the multiple rows of tube bundles 17 passes through the shell of the flue gas water heat exchanger 1 and is connected to the water outlet pipe box 3.

[0249] The flue gas inlet pipe 4 of the flue gas heat exchanger 1 has an upward concave structure, and the flue gas outlet pipe 5 has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger 1, and the annular groove is positioned opposite to the condensate outlet 6.

[0250] Flanges are installed on both the flue gas inlet pipe 4 and the flue gas outlet pipe 5.

[0251] The water inlet pipe box 2 is provided with several first through holes 21. The number of first through holes 21 is the same as the number of rows of pipe bundle 17. One end of the pipe bundle 17 is welded to the first through hole 21 in a one-to-one correspondence.

[0252] The water outlet pipe box 3 is provided with several second through holes 31. The number of second through holes 31 is the same as the number of rows of pipe bundle 17. One end of pipe bundle 17 is welded to the second through hole 31 in a one-to-one correspondence.

[0253] Inside the flue water heat exchanger 1, there are guide plates 18 fixed on both sides of the tube bundle 17. Several holes are opened on the guide plates 18, and each row of tube bundles 17 is spirally arranged along the holes on the two guide plates 18.

[0254] The condensate drain outlet 6 is connected to the condensate drain pipe 7, and the condensate drain pipe 7 is equipped with a shut-off valve 11.

[0255] One end of the water inlet pipe box 2 is connected to the heating furnace return water inlet pipe 8 via a flange, and a water inlet valve 12 is installed on the heating furnace return water inlet pipe 8.

[0256] One end of the water outlet pipe box 3 is connected to the heating furnace return water outlet pipe 9 via a flange, and a water outlet valve 13 is installed on the heating furnace return water outlet pipe 9.

[0257] A bypass pipe 10 is connected between the return water inlet pipe 8 and the return water outlet pipe 9 of the heating furnace. A bypass valve 14 is installed on the bypass pipe 10. The bypass pipe 10 is located outside the water inlet valve 12 and the water outlet valve 13.

[0258] A venting line 16 is connected between the water inlet valve 12 and the water inlet pipe box 2 of the heating furnace return water inlet pipe 8, and a safety valve 15 is installed on the venting line 16.

[0259] The shell of the flue water heat exchanger 1 is square and made of Q235B material, and the tube bundle 17 is a bare tube made of L245N material.

[0260] The deflector plate 18 is made of Q235B material.

Claims

1. A flue gas waste heat utilization device, characterized by, The device includes a flue gas heat exchanger (1), one end of which is connected to a flue gas inlet pipe (4) and the other end is connected to a flue gas outlet pipe (5). A condensate outlet (6) is provided at the end of the flue gas outlet pipe (5). A water inlet pipe box (2) and a water outlet pipe box (3) are fixed on one side of the flue gas heat exchanger (1). The water inlet pipe box (2) is located on the side close to the flue gas outlet pipe (5). Multiple rows of tube bundles (17) are spirally and inclinedly fixed inside the flue gas heat exchanger (1). One end of each of the multiple rows of tube bundles (17) passes through the shell of the flue gas heat exchanger (1) and is connected to the water inlet pipe box (2). The other end of each of the multiple rows of tube bundles (17) passes through the shell of the flue gas heat exchanger (1) and is connected to the water outlet pipe box (3).

2. The flue gas waste heat utilization device according to claim 1, characterized in that, The flue gas inlet pipe (4) of the flue gas heat exchanger (1) has an upward concave structure, and the flue gas outlet pipe (5) has an upward convex structure. An annular groove is provided along the edge of the bottom inner side of the flue gas heat exchanger (1), and the annular groove is positioned opposite to the condensate outlet (6).

3. The flue gas waste heat utilization device according to claim 1, characterized in that, Flanges are installed on both the flue gas inlet pipe (4) and the flue gas outlet pipe (5).

4. The flue gas waste heat utilization device according to claim 1, characterized in that, The water inlet pipe box (2) has several first through holes (21) on its body. The number of first through holes (21) is the same as the number of rows of pipe bundles (17). One end of the pipe bundle (17) is welded to the first through hole (21) one by one.

5. The flue gas waste heat utilization device according to claim 1, characterized in that, The water outlet pipe box (3) is provided with several second through holes (31). The number of second through holes (31) is the same as the number of rows of pipe bundles (17). One end of the pipe bundle (17) is welded to the second through hole (31) one by one.

6. The flue gas waste heat utilization device according to claim 1, characterized in that, The flue water heat exchanger (1) has guide plates (18) fixed on both sides of the tube bundle (17) inside. The guide plates (18) have several holes, and each row of tube bundles (17) is spirally arranged through the holes on the two guide plates (18).

7. The flue gas waste heat utilization device according to claim 1, characterized in that, The condensate outlet (6) is connected to a condensate drain pipe (7), and a shut-off valve (11) is installed on the condensate drain pipe (7).

8. The flue gas waste heat utilization device according to claim 1, characterized in that, The water inlet pipe box (2) is connected to the heating furnace return water inlet pipe (8) by a flange at one end, and a water inlet valve (12) is provided on the heating furnace return water inlet pipe (8).

9. The flue gas waste heat utilization device according to claim 8, characterized in that, The water outlet pipe box (3) is connected to a heating furnace return water outlet pipe (9) by a flange at one end, and a water outlet valve (13) is installed on the heating furnace return water outlet pipe (9).

10. The flue gas waste heat utilization device according to claim 9, characterized in that, A bypass pipe (10) is connected between the return water inlet pipe (8) and the return water outlet pipe (9) of the heating furnace. A bypass valve (14) is installed on the bypass pipe (10). The bypass pipe (10) is located outside the water inlet valve (12) and the water outlet valve (13).

11. The flue gas waste heat utilization device according to claim 8, characterized in that, A drain line (16) is connected between the water inlet valve (12) of the return water inlet pipe (8) of the heating furnace and the water inlet pipe box (2), and a safety valve (15) is installed on the drain line (16).

12. The flue gas waste heat utilization device according to claim 1, characterized in that, The shell of the flue water heat exchanger (1) is square and made of Q235B material, and the tube bundle (17) is a bare tube made of L245N material.

13. The flue gas waste heat utilization device according to claim 6, characterized in that, The guide plate (18) is made of Q235B.

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