A heat exchanger for high temperature flue gas

Abstract

The present invention discloses a heat exchanger for high-temperature flue gas, comprising a first heat exchange module, a second heat exchange module, a third heat exchange module and a fourth heat exchange module, wherein an oil circulation pipeline is connected between the first heat exchange module and the fourth heat exchange module, the fourth heat exchange module is connected to a first water circulation pipeline, and a first water delivery module is provided at the output end of the first water circulation pipeline; the second heat exchange module is connected to a second water circulation pipeline, and a second water delivery module is provided at the output end of the second water circulation pipeline; the third heat exchange module is connected to a third water circulation pipeline, and the output end of the third water circulation pipeline is connected to the input end of the second water circulation pipeline, and a third water delivery module is provided at the output end of the third water circulation pipeline. The present invention recycles and utilizes the high-temperature flue gas generated by the boiler in stages, realizes efficient heat transfer, recycles a high amount of flue gas heat, and reduces waste of flue gas waste heat.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler waste heat recovery, and in particular relates to a heat exchanger for high-temperature flue gas. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The original meaning of a pot refers to a water container heated on fire, and a furnace refers to a place where fuel is burned. A boiler consists of two parts: a pot and a furnace. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives. After the water enters the boiler, the boiler heating surface in the steam-water system transfers the absorbed heat to the water, heating the water into hot water of a certain temperature and pressure or generating steam, which is then drawn out for use. At the same time, the fuel combustion continuously releases heat, and the high-temperature flue gas generated by the combustion transfers heat to the boiler heating surface through heat propagation, while its own temperature gradually decreases and is finally discharged from the chimney.

[0003] The exhaust gas temperature of most boilers is relatively high, and a large amount of latent heat in the flue gas is directly discharged into the atmosphere without being utilized, resulting in a large amount of energy waste. Boiler waste heat recovery is to recycle the heat energy of flue gas, which is one of the most direct and economical means to improve energy utilization and reduce production costs. Lower exhaust temperature can reduce the exhaust loss of the boiler, which is conducive to improving the thermal efficiency of the boiler, saving energy and boiler operating costs. In order to recycle the heat contained in the boiler flue gas as much as possible without affecting the normal discharge of the boiler flue gas, a heat exchange device is generally provided on the flue gas discharge pipeline of the boiler. For example, Chinese patent document CN219244342U discloses a boiler flue gas waste heat utilization device, which relates to the field of boiler technology, including: a heat exchange box; a heat exchange tube assembly, which is arranged in the heat exchange box, and the flue gas is heat exchanged through the water in the heat exchange box; a stirring mechanism, which is arranged in the heat exchange box, disturbs the water, and improves the heat exchange efficiency between the water and the hot flue gas in the heat exchange tube assembly. The patent document diverts the smoke from the second connecting pipe through the horizontal pipe and then discharges it through the smoke exhaust hole. As the smoke rises in the water, the dust in the smoke remains in the water, thereby increasing the purification effect of the smoke. The smoke filtered by the water filter box moves upward, and the nozzle is turned on at this time. The water mist contacts and wraps the remaining micro dust particles in the smoke, so that the particles and the smoke are separated again, thereby further improving the purification effect of the smoke. However, the patent document adopts a water circulation heat exchange method. Since water has a low boiling point and is easy to generate steam, the heat utilization rate of the high-temperature smoke is low, and there are greater safety requirements for the working environment. Summary of the invention

[0004] The object of the present invention is to provide a heat exchanger for high-temperature flue gas to solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a heat exchanger for high-temperature flue gas, comprising a first heat exchange module, a second heat exchange module, a third heat exchange module and a fourth heat exchange module, wherein the first heat exchange module, the second heat exchange module and the third heat exchange module are sequentially arranged along the conveying direction of the high-temperature flue gas, the first heat exchange module is connected to a high-temperature flue gas input pipe, and the third heat exchange module is connected to a high-temperature flue gas output pipe; an oil circulation pipeline is connected between the first heat exchange module and the fourth heat exchange module, the fourth heat exchange module is connected to a first water circulation pipeline, and a first water supply module is provided at an output end of the first water circulation pipeline; the second heat exchange module is connected to a second water circulation pipeline, and a second water supply module is provided at an output end of the second water circulation pipeline; the third heat exchange module is connected to a third water circulation pipeline, the output end of the third water circulation pipeline is connected to the input end of the second water circulation pipeline, and a third water supply module is provided at an output end of the third water circulation pipeline.

[0006] As an optional implementation of the above technical solution, a first temperature sensor is provided at the output end of the first water circulation pipeline, and a second temperature sensor is provided at the output end of the second water circulation pipeline; a first three-way proportional valve is connected between the output end of the first water circulation pipeline and the output end of the second water circulation pipeline, a fourth water delivery module is provided at the output end of the first three-way proportional valve, the first three-way proportional valve is connected to a controller, the first temperature sensor and the second temperature sensor are both connected to the controller, and the controller is used to dynamically adjust the opening of the first three-way proportional valve based on the outlet water temperature of the first water circulation pipeline and the outlet water temperature of the second water circulation pipeline, so that the fourth water delivery module obtains water at a set temperature.

[0007] As an optional implementation of the above technical solution, a third temperature sensor is provided at the output end of the third water circulation pipeline, a second three-way proportional valve is connected between the output end of the third water circulation pipeline and the output end of the second water circulation pipeline, a fifth water delivery module is provided at the output end of the second three-way proportional valve, the second three-way proportional valve and the third temperature sensor are both connected to a controller, and the controller is used to dynamically adjust the opening of the second three-way proportional valve based on the outlet water temperature of the third water circulation pipeline and the outlet water temperature of the second water circulation pipeline, so that the fifth water delivery module obtains water at a set temperature.

[0008] As an optional implementation of the above technical solution, the first heat exchange module includes a first heat exchange shell and a first heat exchange tube. The first heat exchange shell is provided with a first flue connected to the high-temperature flue gas input pipe, and the first heat exchange shell is provided with an oil inlet and an oil outlet. The first heat exchange tube is arranged in the first flue, and the two ends of the first heat exchange tube are respectively connected to the oil inlet and the oil outlet.

[0009] As an optional implementation of the above technical solution, the fourth heat exchange module includes a fourth heat exchange shell, the fourth heat exchange shell is provided with an oil delivery port, an oil discharge port, a first water inlet and a first water outlet, the fourth heat exchange shell is provided with an oil inlet chamber, a heat exchange chamber and an oil outlet chamber, the oil inlet chamber is connected with the oil delivery port, the oil outlet chamber is connected with the oil discharge port, the first water inlet and the first water outlet are both connected with the heat exchange chamber, a plurality of fourth heat exchange tubes are provided in the heat exchange chamber, and both ends of the fourth heat exchange tubes are respectively connected with the oil inlet chamber and the oil outlet chamber.

[0010] As an optional implementation of the above technical solution, the oil circulation pipeline includes an oil inlet pipe, an oil outlet pipe and a driving oil pump, the two ends of the oil inlet pipe are respectively connected to the oil inlet and the oil discharge port, the two ends of the oil outlet pipe are respectively connected to the oil outlet and the oil delivery port, and the driving oil pump is arranged on the oil inlet pipe or the oil outlet pipe.

[0011] As an optional implementation of the above technical solution, a third three-way proportional valve is provided on the oil inlet pipe, a connecting pipe is provided between one input end of the third three-way proportional valve and the oil outlet pipe, the other input end of the third three-way proportional valve is connected to the oil discharge port, the output end of the third three-way proportional valve is connected to the oil inlet, and the third three-way proportional valve is connected to a controller. The controller is used to dynamically adjust the opening of the third three-way proportional valve based on the oil outlet temperature of the oil discharge port and the oil outlet temperature of the oil outlet, so that the oil inlet obtains the heat transfer oil of the set temperature.

[0012] As an optional implementation of the above technical solution, the first water circulation pipeline includes a first water inlet pipe and a first water outlet pipe, the first water inlet pipe is connected to the first water inlet, one end of the first water outlet pipe is connected to the first water outlet, and the other end of the first water outlet pipe is connected to the first water transfer module.

[0013] As an optional implementation of the above technical solution, the second heat exchange module includes a second heat exchange shell and a second heat exchange tube, a second flue connected to the first flue is provided inside the second heat exchange shell, a second water inlet and a second water outlet are provided on the second heat exchange shell, the second heat exchange tube is arranged in the second flue, and both ends of the second heat exchange tube are respectively connected to the second water inlet and the second water outlet.

[0014] As an optional implementation of the above technical solution, the second water circulation pipeline includes a second water inlet pipe and a second water outlet pipe, one end of the second water inlet pipe is connected to the second water inlet, the other end of the second water inlet pipe is connected to the third water circulation pipeline, one end of the second water outlet pipe is connected to the second water outlet, and the other end of the second water outlet pipe is connected to the second water transfer module.

[0015] As an optional implementation of the above technical solution, the third heat exchange module includes a third heat exchange shell and a third heat exchange tube. The third heat exchange shell is provided with a third flue connected to the second flue. The third heat exchange shell is provided with a third water inlet and a third water outlet. The third heat exchange tube is arranged in the third flue, and both ends of the third heat exchange tube are respectively connected to the third water inlet and the third water outlet. A water supply pipe is connected between the third water outlet and the second water inlet.

[0016] As an optional implementation of the above technical solution, the third water circulation pipeline includes a third water inlet pipe and a third water outlet pipe, the third water inlet pipe is connected to the third water inlet, one end of the third water outlet pipe is connected to the third water outlet, and the other end of the third water outlet pipe is respectively connected to the second water circulation pipeline and the third water transfer module.

[0017] As an optional implementation of the above technical solution, the high-temperature flue gas inlet pipe is connected to a first bypass pipe, a second bypass pipe is provided between the output end of the first bypass pipe and the second heat exchange module, and a third bypass pipe is provided between the output end of the first bypass pipe and the third heat exchange module.

[0018] The beneficial effects of the present invention are:

[0019] The present invention utilizes the first heat exchange module, the second heat exchange module, the third heat exchange module and the fourth heat exchange module to grade and recycle the high-temperature flue gas generated by the boiler, thereby realizing efficient heat transfer, recovering a high amount of flue gas heat, and reducing the waste of flue gas waste heat; in addition, the present invention utilizes heat transfer oil to exchange heat with the high-temperature flue gas in the first heat exchange module, thereby avoiding the problem of water directly exchanging heat with the high-temperature flue gas and easily generating steam, thereby reducing the safety requirements of the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a heat exchanger for high-temperature flue gas in one embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of a first heat exchange module in one embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a fourth heat exchange module in one embodiment of the present invention;

[0023] Figure 4 It is a schematic structural diagram of an oil circulation pipeline and a first water circulation pipeline in one embodiment of the present invention.

[0024] In the figure: 1-first heat exchange module; 2-second heat exchange module; 3-third heat exchange module; 4-fourth heat exchange module; 5-high-temperature flue gas input pipe; 6-high-temperature flue gas output pipe; 7-oil circulation pipeline; 8-first water circulation pipeline; 9-first water delivery module; 10-second water circulation pipeline; 11-second water delivery module; 12-third water circulation pipeline; 13-third water delivery module; 14-first three-way proportional valve; 15-fourth water delivery module; 16-second three-way proportional valve; 17-fifth water delivery module; 18-first heat exchange shell; 19-first heat exchange tube; 20-oil inlet; 21-oil outlet; 22-fourth heat exchange shell; 23-oil delivery port; 24-oil discharge port; 25-first water inlet; 26-first water outlet; 27-oil inlet chamber; 28-heat exchange chamber; 29-oil outlet chamber; 30-fourth heat exchange tube; 31-oil inlet pipe; 32-oil outlet pipe; 33-driving oil pump; 34-third three-way proportional valve; 35-connecting pipe; 36-first water inlet pipe; 37-first water outlet pipe; 38-first bypass pipe; 39-second bypass pipe; 40-third bypass pipe. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 4 As shown, this embodiment provides a heat exchanger for high-temperature flue gas, including a first heat exchange module 1, a second heat exchange module 2, a third heat exchange module 3 and a fourth heat exchange module 4. The first heat exchange module 1, the second heat exchange module 2 and the third heat exchange module 3 are sequentially arranged along the conveying direction of the high-temperature flue gas, the first heat exchange module 1 is connected to a high-temperature flue gas input pipe 5, and the third heat exchange module 3 is connected to a high-temperature flue gas output pipe 6. The first heat exchange module 1 first recovers the waste heat of the high-temperature flue gas, then recovers the waste heat of the medium-temperature flue gas through the second heat exchange module 2, and then recovers the waste heat of the low-temperature flue gas through the third heat exchange module 3. Through three-stage waste heat recovery, efficient heat recovery and transfer are achieved, which is particularly suitable for high-temperature flue gas heat energy recovery of boilers.

[0026] like Figure 1 As shown, an oil circulation pipeline 7 is connected between the first heat exchange module 1 and the fourth heat exchange module 4, and the fourth heat exchange module 4 is connected to a first water circulation pipeline 8, and a first water transfer module 9 is provided at the output end of the first water circulation pipeline 8. The oil circulation pipeline 7 contains heat transfer oil, which circulates between the first heat exchange module 1 and the fourth heat exchange module 4. The heat transfer oil exchanges heat with high-temperature flue gas in the first heat exchange module 1 to obtain high-temperature oil, and the high-temperature oil exchanges heat with water in the fourth heat exchange module 4 to obtain high-temperature water. The water temperature of the high-temperature water is usually 80°C-100°C, and the high-temperature water is output through the first water transfer module 9 as production or living water.

[0027] The second heat exchange module 2 is connected to a second water circulation pipeline 10, and a second water delivery module 11 is provided at the output end of the second water circulation pipeline 10. The medium-temperature flue gas exchanges heat with the second heat exchange module 2 to obtain medium-temperature water, the water temperature of which is usually 40°C-60°C, and the medium-temperature water is output through the second water delivery module 11 as production or domestic water. The third heat exchange module 3 is connected to a third water circulation pipeline 12, and the output end of the third water circulation pipeline 12 is connected to the input end of the second water circulation pipeline 10, and a third water delivery module 13 is provided at the output end of the third water circulation pipeline 12. The low-temperature flue gas exchanges heat with the third heat exchange module 3 to obtain low-temperature water, the water temperature of which is usually 0°C-30°C, and the low-temperature water is output through the third water delivery module 13 as production or domestic water. Since the output end of the third water circulation pipeline 12 is connected to the input end of the second water circulation pipeline 10, the low-temperature water can enter the second water circulation pipeline 10 to increase the water temperature of the medium-temperature water.

[0028] The present invention utilizes the first heat exchange module 1, the second heat exchange module 2, the third heat exchange module 3 and the fourth heat exchange module 4 to grade and recycle the high-temperature flue gas generated by the boiler, thereby realizing efficient heat transfer, recovering a high amount of flue gas heat, and reducing the waste of flue gas waste heat; in addition, the present invention utilizes heat transfer oil to exchange heat with the high-temperature flue gas in the first heat exchange module 1, thereby avoiding the problem of water directly exchanging heat with the high-temperature flue gas and easily generating steam, thereby reducing the safety requirements of the working environment.

[0029] Specifically, a first temperature sensor is provided at the output end of the first water circulation pipeline 8, and a second temperature sensor is provided at the output end of the second water circulation pipeline 10; a first three-way proportional valve 14 is connected between the output end of the first water circulation pipeline 8 and the output end of the second water circulation pipeline 10, and a fourth water transfer module 15 is provided at the output end of the first three-way proportional valve 14. The first three-way proportional valve 14 is connected to a controller, and the first temperature sensor and the second temperature sensor are both connected to the controller. The controller is used to dynamically adjust the opening of the first three-way proportional valve 14 based on the outlet water temperature of the first water circulation pipeline 8 and the outlet water temperature of the second water circulation pipeline 10, so that the fourth water transfer module 15 obtains medium and high temperature water of a set temperature. The water temperature of the medium and high temperature water is usually higher than 60°C and lower than 80°C to meet different production or domestic water needs.

[0030] A third temperature sensor is provided at the output end of the third water circulation pipeline 12, a second three-way proportional valve 16 is connected between the output end of the third water circulation pipeline 12 and the output end of the second water circulation pipeline 10, a fifth water delivery module 17 is provided at the output end of the second three-way proportional valve 16, the second three-way proportional valve 16 and the third temperature sensor are both connected to a controller, and the controller is used to dynamically adjust the opening of the second three-way proportional valve 16 based on the outlet water temperature of the third water circulation pipeline 12 and the outlet water temperature of the second water circulation pipeline 10, so that the fifth water delivery module 17 obtains medium and low temperature water of a set temperature, and the water temperature of the medium and low temperature water is usually higher than 30°C and lower than 40°C to meet different production or domestic water needs.

[0031] like Figure 2 As shown, in a specific embodiment, the first heat exchange module 1 includes a first heat exchange shell 18 and a first heat exchange tube 19. The first heat exchange shell 18 is provided with a first flue in communication with the high-temperature flue gas input pipe 5. The first heat exchange shell 18 is provided with an oil inlet 20 and an oil outlet 21. The first heat exchange tube 19 is arranged in the first flue, and the two ends of the first heat exchange tube 19 are respectively connected with the oil inlet 20 and the oil outlet 21. The oil inlet 20 and the oil outlet 21 are both connected with the oil circulation pipeline 7, so that the heat transfer oil and the high-temperature flue gas can exchange heat.

[0032] like Figure 3 As shown, the fourth heat exchange module 4 includes a fourth heat exchange shell 22, on which an oil delivery port 23, an oil discharge port 24, a first water inlet 25 and a first water outlet 26 are provided. An oil inlet chamber 27, a heat exchange chamber 28 and an oil outlet chamber 29 are provided inside the fourth heat exchange shell 22. The oil inlet chamber 27 is communicated with the oil delivery port 23, the oil outlet chamber 29 is communicated with the oil discharge port 24, the first water inlet 25 and the first water outlet 26 are both communicated with the heat exchange chamber 28, and a plurality of fourth heat exchange tubes 30 are provided in the heat exchange chamber 28, and both ends of the fourth heat exchange tubes 30 are respectively communicated with the oil inlet chamber 27 and the oil outlet chamber 29.

[0033] The oil circulation pipeline 7 is connected to the first heat exchange pipe 19 and the fourth heat exchange pipe 30 to realize the circulation of the heat transfer oil. Figure 4As shown, specifically, the oil circulation pipeline 7 includes an oil inlet pipe 31, an oil outlet pipe 32 and a driving oil pump 33. The two ends of the oil inlet pipe 31 are respectively connected to the oil inlet 20 and the oil outlet 24, the two ends of the oil outlet pipe 32 are respectively connected to the oil outlet 21 and the oil delivery port 23, and the driving oil pump 33 is arranged on the oil inlet pipe 31 or the oil outlet pipe 32. Among them, a third three-way proportional valve 34 is arranged on the oil inlet pipe 31, a connecting pipe 35 is arranged between one input end of the third three-way proportional valve 34 and the oil outlet pipe 32, the other input end of the third three-way proportional valve 34 is connected to the oil outlet 24, the output end of the third three-way proportional valve 34 is connected to the oil inlet 20, and the third three-way proportional valve 34 is connected to a controller, and the controller is used to dynamically adjust the opening of the third three-way proportional valve 34 based on the oil outlet temperature of the oil outlet 24 and the oil outlet temperature of the oil outlet 21, so that the oil inlet 20 obtains the heat transfer oil of the set temperature. The first water circulation pipeline 8 includes a first water inlet pipe 36 and a first water outlet pipe 37. The first water inlet pipe 36 is connected to the first water inlet 25. One end of the first water outlet pipe 37 is connected to the first water outlet 26. The other end of the first water outlet pipe 37 is connected to the first water delivery module 9 to achieve the output of high-temperature water.

[0034] In a specific embodiment, the second heat exchange module 2 adopts the same structure as the first heat exchange module 1. Specifically, the second heat exchange module 2 includes a second heat exchange shell and a second heat exchange tube. The second heat exchange shell is provided with a second flue connected to the first flue. The second heat exchange shell is provided with a second water inlet and a second water outlet. The second heat exchange tube is arranged in the second flue, and the two ends of the second heat exchange tube are respectively connected to the second water inlet and the second water outlet. Among them, the second water circulation pipeline 10 includes a second water inlet pipe and a second water outlet pipe, one end of the second water inlet pipe is connected to the second water inlet, the other end of the second water inlet pipe is connected to the third water circulation pipeline 12, one end of the second water outlet pipe is connected to the second water outlet, and the other end of the second water outlet pipe is connected to the second water delivery module 11.

[0035] In a specific embodiment, the third heat exchange module 3 adopts the same structure as the first heat exchange module 1. Specifically, the third heat exchange module 3 includes a third heat exchange shell and a third heat exchange tube. The third heat exchange shell is provided with a third flue connected to the second flue. The third heat exchange shell is provided with a third water inlet and a third water outlet. The third heat exchange tube is arranged in the third flue. The two ends of the third heat exchange tube are respectively connected to the third water inlet and the third water outlet. A water supply pipe is connected between the third water outlet and the second water inlet. The third water circulation pipeline 12 includes a third water inlet pipe and a third water outlet pipe. The third water inlet pipe is connected to the third water inlet. One end of the third water outlet pipe is connected to the third water outlet. The other end of the third water outlet pipe is respectively connected to the second water circulation pipeline 10 and the third water delivery module 13.

[0036] As an optional implementation of this embodiment, the high-temperature flue gas input pipe 5 is connected to a first bypass pipe 38, a second bypass pipe 39 is provided between the output end of the first bypass pipe 38 and the second heat exchange module 2, and a third bypass pipe 40 is provided between the output end of the first bypass pipe 38 and the third heat exchange module 3. In some emergency situations, such as when the oil temperature at the output end of the oil circulation pipeline 7 is too high, the high-temperature flue gas can be transported to the second heat exchange module 2 and the third heat exchange module 3 through the first bypass pipe 38 to improve the waste heat recovery efficiency of the high-temperature flue gas, but the water temperature of the second water delivery module 11 and the third water delivery module 13 needs to be monitored in time to prevent the water temperature from being too high and affecting normal production or life.

[0037] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A heat exchanger for high-temperature flue gas, characterized in that: The invention comprises a first heat exchange module (1), a second heat exchange module (2), a third heat exchange module (3) and a fourth heat exchange module (4); the first heat exchange module (1), the second heat exchange module (2) and the third heat exchange module (3) are arranged in sequence along the conveying direction of the high-temperature flue gas; the first heat exchange module (1) is connected to a high-temperature flue gas input pipe (5); the third heat exchange module (3) is connected to a high-temperature flue gas output pipe (6); an oil circulation pipeline (7) is connected between the first heat exchange module (1) and the fourth heat exchange module (4); the fourth heat exchange module (4) is connected to There is a first water circulation pipeline (8), and a first water transfer module (9) is provided at the output end of the first water circulation pipeline (8); the second heat exchange module (2) is connected to the second water circulation pipeline (10), and a second water transfer module (11) is provided at the output end of the second water circulation pipeline (10); the third heat exchange module (3) is connected to the third water circulation pipeline (12), the output end of the third water circulation pipeline (12) is in communication with the input end of the second water circulation pipeline (10), and a third water transfer module (13) is provided at the output end of the third water circulation pipeline (12); The output end of the first water circulation pipeline (8) is provided with a first temperature sensor, and the output end of the second water circulation pipeline (10) is provided with a second temperature sensor; a first three-way proportional valve (14) is connected between the output end of the first water circulation pipeline (8) and the output end of the second water circulation pipeline (10); a fourth water delivery module (15) is provided at the output end of the first three-way proportional valve (14); the first three-way proportional valve (14) is connected to a controller, the first temperature sensor and the second temperature sensor are both connected to the controller, and the controller is used to dynamically adjust the opening of the first three-way proportional valve (14) based on the outlet water temperature of the first water circulation pipeline (8) and the outlet water temperature of the second water circulation pipeline (10), so that the fourth water delivery module (15) obtains water of a set temperature; The first heat exchange module (1) comprises a first heat exchange shell (18) and a first heat exchange tube (19); a first flue in communication with a high-temperature flue gas input pipe (5) is provided inside the first heat exchange shell (18); an oil inlet (20) and an oil outlet (21) are provided on the first heat exchange shell (18); the first heat exchange tube (19) is arranged in the first flue; and two ends of the first heat exchange tube (19) are respectively connected with the oil inlet (20) and the oil outlet (21); The fourth heat exchange module (4) comprises a fourth heat exchange shell (22), the fourth heat exchange shell (22) being provided with an oil delivery port (23), an oil discharge port (24), a first water inlet port (25) and a first water outlet port (26), the fourth heat exchange shell (22) being provided with an oil inlet chamber (27), a heat exchange chamber (28) and an oil outlet chamber (29), the oil inlet chamber (27) being in communication with the oil delivery port (23), the oil outlet chamber (29) being in communication with the oil discharge port (24), the first water inlet port (25) and the first water outlet port (26) both being in communication with the heat exchange chamber (28), a plurality of fourth heat exchange tubes (30) being provided in the heat exchange chamber (28), the two ends of the fourth heat exchange tubes (30) being respectively in communication with the oil inlet chamber (27) and the oil outlet chamber (29); The oil circulation pipeline (7) comprises an oil inlet pipe (31), an oil outlet pipe (32) and a driving oil pump (33); the two ends of the oil inlet pipe (31) are respectively connected to the oil inlet port (20) and the oil outlet port (24); the two ends of the oil outlet pipe (32) are respectively connected to the oil outlet port (21) and the oil delivery port (23); the driving oil pump (33) is arranged on the oil inlet pipe (31) or the oil outlet pipe (32); the oil inlet pipe (31) is provided with a third three-way proportional valve (34); the third three-way proportional valve (34) A connecting pipe (35) is provided between one input end of the third three-way proportional valve (34) and the oil outlet pipe (32); the other input end of the third three-way proportional valve (34) is in communication with the oil discharge port (24); the output end of the third three-way proportional valve (34) is in communication with the oil inlet (20); the third three-way proportional valve (34) is connected to a controller; the controller is used to dynamically adjust the opening of the third three-way proportional valve (34) based on the oil outlet temperature of the oil discharge port (24) and the oil outlet temperature of the oil outlet (21), so that the oil inlet (20) obtains heat transfer oil at a set temperature.

2. The high-temperature flue gas heat exchanger according to claim 1, characterized in that: The output end of the third water circulation pipeline (12) is provided with a third temperature sensor, a second three-way proportional valve (16) is connected between the output end of the third water circulation pipeline (12) and the output end of the second water circulation pipeline (10), a fifth water delivery module (17) is provided at the output end of the second three-way proportional valve (16), and the second three-way proportional valve (16) and the third temperature sensor are both connected to a controller, the controller being used to dynamically adjust the opening of the second three-way proportional valve (16) based on the outlet water temperature of the third water circulation pipeline (12) and the outlet water temperature of the second water circulation pipeline (10), so that the fifth water delivery module (17) obtains water of a set temperature.

3. The high-temperature flue gas heat exchanger according to claim 1, characterized in that: The first water circulation pipeline (8) comprises a first water inlet pipe (36) and a first water outlet pipe (37); the first water inlet pipe (36) is in communication with the first water inlet (25); one end of the first water outlet pipe (37) is in communication with the first water outlet (26); and the other end of the first water outlet pipe (37) is in communication with the first water transfer module (9).

4. The high-temperature flue gas heat exchanger according to claim 1, characterized in that: The second heat exchange module (2) comprises a second heat exchange shell and a second heat exchange tube, the second heat exchange shell is provided with a second flue in the interior thereof and connected to the first flue, the second heat exchange shell is provided with a second water inlet and a second water outlet, the second heat exchange tube is arranged in the second flue, and the two ends of the second heat exchange tube are respectively connected to the second water inlet and the second water outlet; the second water circulation pipeline (10) comprises a second water inlet pipe and a second water outlet pipe, one end of the second water inlet pipe is connected to the second water inlet, the other end of the second water inlet pipe is connected to the third water circulation pipeline (12), one end of the second water outlet pipe is connected to the second water outlet, and the other end of the second water outlet pipe is connected to the second water transfer module (11).

5. The high-temperature flue gas heat exchanger according to claim 1, characterized in that: The third heat exchange module (3) comprises a third heat exchange shell and a third heat exchange pipe. A third flue connected to the second flue is provided inside the third heat exchange shell. A third water inlet and a third water outlet are provided on the third heat exchange shell. The third heat exchange pipe is arranged in the third flue. Two ends of the third heat exchange pipe are respectively connected to the third water inlet and the third water outlet. A water supply pipe is connected between the third water outlet and the second water inlet. The third water circulation pipeline (12) comprises a third water inlet pipe and a third water outlet pipe. The third water inlet pipe is connected to the third water inlet. One end of the third water outlet pipe is connected to the third water outlet. The other end of the third water outlet pipe is respectively connected to the second water circulation pipeline (10) and the third water transfer module (13).

6. The high-temperature flue gas heat exchanger according to claim 1, characterized in that: The high-temperature flue gas input pipe (5) is connected to a first bypass pipe (38), a second bypass pipe (39) is provided between an output end of the first bypass pipe (38) and the second heat exchange module (2), and a third bypass pipe (40) is provided between the output end of the first bypass pipe (38) and the third heat exchange module (3).

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