Waste heat recovery and reuse system and power generation system

Abstract

The present invention relates to a waste heat recovery and reuse system and a power generation system, and relates to the technical field of waste heat recovery. The waste heat recovery and reuse system includes a heat conversion box, a circulation module, a purification module, a water supply module and a controller; the power generation system includes a blast furnace, a steam generator, a first water supply pipeline and a steam turbine, wherein the steam generator is connected to the blast furnace, one end of the first water supply pipeline is connected to the water softener, the other end of the first water supply pipeline is connected to the steam generator, the air intake end of the steam turbine is connected to the air outlet end of the steam generator, and the end of the first air intake pipe away from the heat conversion box is connected to the blast furnace. The present invention can realize the instantaneous heat conversion between the high-temperature flue gas and the water by alternately circulating and heating the water in the first water tank and the second water tank in the heat conversion box when recovering the heat of the high-temperature flue gas, thereby improving the heat conversion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery, and in particular to a waste heat recovery and reuse system and a power generation system. Background Art

[0002] Waste heat resources refer to the heat energy contained in exhaust gas, drainage liquid and high-temperature materials to be cooled at a certain temperature, or the energy that can be recovered and reused under current conditions but has not yet been recovered.

[0003] The existing waste heat recovery system of a power plant introduces the high-temperature flue gas generated by the boiler into the waste heat recovery system, recovers the waste heat of the high-temperature flue gas in the waste heat recovery system, and uses the recovered waste heat to heat water, which is then supplied to cities or other projects for use.

[0004] However, after the high-temperature flue gas heats the water to a certain temperature, the hot water needs to be discharged. When discharging the hot water, if cold water continues to be added to the circulation pipe, the discharge temperature of the hot water will be lowered. When cold water is added to the circulation pipe of the stop box, the waste heat of the high-temperature flue gas cannot be converted into the water, thereby reducing the heat conversion efficiency. Summary of the invention

[0005] In order to improve the heat conversion efficiency of high-temperature flue gas, the present invention provides a waste heat recovery and reuse system and a power generation system.

[0006] In a first aspect, the present invention provides a waste heat recovery and reuse system, a waste heat recovery and reuse system comprising a heat conversion box, a circulation module, a purification module, a water supply module and a controller, the circulation module comprising a first air inlet pipe, a first air outlet pipe, a first water inlet pipe, a first water outlet pipe and a first water tank, the heat conversion box is provided with a first water inlet hole, a first water outlet, a first air inlet and a first air outlet, the first air inlet pipe is connected to the heat conversion box through the first air inlet, the first air outlet pipe is connected to the heat conversion box through the first air outlet, one end of the first water inlet pipe is connected to the heat conversion box through the first water inlet, and the other end is connected to the first water tank; the first water outlet pipe is connected to the heat conversion box through the first water outlet The first water tank is connected to the heat conversion box, and the other end is connected to the first water tank; the input end of the purification module is connected to the end of the first air outlet pipe away from the heat conversion box, the water supply module is connected to the first water tank, the first water inlet pipe is connected to the first water pump and the first electric-controlled ball valve, the first water outlet pipe is connected to the second electric-controlled ball valve and the second water pump, a first temperature sensor is arranged in the first water tank, a first drain pipe is connected to the first water tank, a third electric-controlled ball valve and a third water pump are connected to the first drain pipe, the first water pump, the first electric-controlled ball valve, the second electric-controlled ball valve, the second water pump, the third electric-controlled ball valve, the third water pump and the first temperature sensor are all connected to the controller electrical signal.

[0007] The above-mentioned technical scheme in the embodiment of the present application has at least the following technical effects: when recovering waste heat, high-temperature flue gas with waste heat is charged into the heat conversion box through the first air inlet pipe, the water supply module injects water into the first water tank, the controller controls the first electrically-controlled ball valve and the first water pump to open, the first water pump injects the water in the first water tank into the heat conversion box through the first water inlet pipe, the water is heated in the heat conversion box, and circulates to the first water tank through the first water outlet pipe and the second water pump. When the first temperature sensor detects that the temperature in the first water tank rises to a preset value, the controller controls the first electrically-controlled ball valve, the second electrically-controlled ball valve, the first water pump and the second water pump to stop running. At the same time, the controller controls the third water pump and the third electrically-controlled ball valve to open, and discharges the heated water in the first water tank for power generation or for residents.

[0008] In some embodiments, the circulation module also includes a second water inlet pipe, a second water outlet pipe and a second water tank, one end of the second water inlet pipe is connected to the heat conversion box through the second water inlet, and the other end is connected to the second water tank; the second water outlet pipe is connected to the heat conversion box through the second water outlet, and the other end is connected to the second water tank; the second water inlet pipe is connected to a fourth water pump and a fourth electrically-controlled ball valve, the second water outlet pipe is connected to a fifth electrically-controlled ball valve and a fifth water pump, a second temperature sensor is arranged in the second water tank, a second drain pipe is connected to the second water tank, the second drain pipe is connected to a sixth electrically-controlled ball valve and a sixth water pump, the fourth water pump, the fourth electrically-controlled ball valve, the fifth electrically-controlled ball valve, the fifth water pump, the sixth electrically-controlled ball valve, the sixth water pump and the second temperature sensor are all connected to the controller electrical signal.

[0009] When the waste heat is recovered, the high-temperature flue gas with waste heat is charged into the heat conversion box through the first air inlet pipe, and the water supply module injects water into the first water tank and the second water tank. The controller controls the first electrically controlled ball valve and the first water pump to open, and the first water pump injects the water in the first water tank into the heat conversion box through the first water inlet pipe. The water is heated in the heat conversion box and circulates to the first water tank through the first water outlet pipe and the second water pump. When the first temperature sensor detects that the temperature in the first water tank rises to a preset value, the controller controls the first electrically controlled ball valve, the second electrically controlled ball valve, the first water pump and the second water pump to stop running. The controller controls the fourth electrically-controlled ball valve, the fifth electrically-controlled ball valve, the fourth water pump and the fifth water pump to open. At the same time, the controller controls the third water pump and the third electrically-controlled ball valve to open, and the heated water in the first water tank is discharged. The sixth water pump and the sixth electrically-controlled ball valve are closed, and the unheated water in the second water tank enters the heat conversion box for heating. After the water in the first water tank is discharged, water is injected into the first water tank of the water supply module box. When the second temperature sensor detects that the temperature in the second water tank rises to a preset value, the water in the second water tank is discharged. At this time, the water in the first water tank enters the heat conversion box for circulation heating.

[0010] When the heat of the high-temperature flue gas is recovered and utilized, the water in the first water tank and the second water tank is alternately circulated and heated in the heat conversion box, thereby achieving instant heat conversion between the high-temperature flue gas and water, thereby improving the heat conversion efficiency.

[0011] In some embodiments, the purification module includes a purification chamber, a first connecting pipe, an induced draft fan and a chimney, the input end of the purification chamber is connected to the end of the first exhaust pipe away from the heat conversion box, the output end of the purification chamber is connected to the chimney through the first connecting pipe, and the induced draft fan is arranged in the first connecting pipe.

[0012] In some embodiments, the water supply module includes a water softener, a second connecting pipe, a third connecting pipe, a seventh electrically-controlled ball valve and an eighth electrically-controlled ball valve, one end of the second connecting pipe is connected to the first water tank, the other end of the second connecting pipe is connected to the water softener, one end of the third connecting pipe is connected to the second water tank, the other end of the third connecting pipe is connected to the water softener, the seventh electrically-controlled ball valve is arranged on the second connecting pipe, the eighth electrically-controlled ball valve is arranged on the third connecting pipe, and the seventh electrically-controlled ball valve and the eighth electrically-controlled ball valve are both connected to the controller electrical signal.

[0013] In some embodiments, the first water inlet pipe and the second water inlet pipe in the heat conversion box are both spiral-shaped.

[0014] In a second aspect, the present invention provides a power generation system, a power generation system, comprising the waste heat recovery and reuse system as described in the first aspect, and also comprising a blast furnace, a steam generator, a first water supply pipe and a steam turbine, the steam generator being connected to the blast furnace, one end of the first water supply pipe being connected to the water softener, the other end of the first water supply pipe being connected to the steam generator, the air inlet end of the steam turbine being connected to the air outlet end of the steam generator, and the end of the first air inlet pipe away from the heat conversion box being connected to the blast furnace.

[0015] In some embodiments, the end of the third electrically-controlled ball valve away from the first water tank and the end of the sixth electrically-controlled ball valve away from the second water tank are connected to a three-way pipe, the three-way pipe is connected to the steam generator, the three-way pipe is connected to a solenoid valve, and the solenoid valve is electrically signal-connected to the controller.

[0016] In some embodiments, the three-way pipe is also connected to a discharge pipe, and the discharge pipe is connected to a discharge valve.

[0017] In summary, the present invention includes at least one of the following beneficial technical effects:

[0018] 1. When the heat of high-temperature flue gas is recovered and utilized, the water in the first water tank and the second water tank is alternately circulated and heated in the heat conversion box, so that the heat conversion between the high-temperature flue gas and water is realized at all times, thereby improving the heat conversion efficiency.

[0019] 2. The flue gas after heat conversion in the heat conversion box is purified in the purification chamber, passes through the first connecting pipe under the action of the induced draft fan, and is discharged into the atmosphere through the chimney. Due to the setting of the purification chamber, harmful substances in the flue gas are filtered, thereby reducing the probability of flue gas polluting the air.

[0020] 3. When the water temperature in the first water tank reaches the preset value, the controller controls the third water pump, the third electrically controlled ball valve and the solenoid valve to open, and the high-temperature water is transported to the steam generator through the three-way pipe. When the water temperature in the second water tank reaches the preset value, the controller controls the sixth water pump, the sixth electrically controlled ball valve and the solenoid valve to open, and the high-temperature water is transported to the steam generator through the three-way pipe. When the water source is provided in the steam generator, the water is heated in advance through waste heat recovery, thereby improving the working efficiency of the steam generator, saving the energy consumed by the blast furnace, and improving the power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is a schematic diagram of the overall system structure of Example 1 of the present application;

[0023] Figure 2 This is a schematic diagram of the overall system structure in Example 2 of the present application;

[0024] Figure 3 This is the control system diagram of the controller.

[0025] Among them, the reference numerals in the figure are:

[0026] 1. Controller; 10. Heat conversion box; 11. First air inlet pipe; 12. First air outlet pipe; 13. First water inlet pipe; 131. First water pump; 132. First electric ball valve; 14. First water outlet pipe; 141. Second water pump; 142. Second electric ball valve; 15. First water tank; 151. First temperature sensor; 152. First drain pipe; 153. Third water pump; 154. Third electric ball valve; 16. Second water inlet pipe; 161. Fourth water pump; 162. Fourth electric ball valve; 17. Second water outlet pipe; 171. Fifth water pump; 1 72. fifth electrically-controlled ball valve; 18. second water tank; 181. second temperature sensor; 182. second drain pipe; 183. sixth electrically-controlled ball valve; 184. sixth water pump; 21. purification chamber; 22. first connecting pipe; 23. induced draft fan; 24. chimney; 31. water softener; 32. second connecting pipe; 33. third connecting pipe; 34. seventh electrically-controlled ball valve; 35. eighth electrically-controlled ball valve; 4. blast furnace; 5. steam generator; 6. first water supply pipeline; 7. steam turbine; 8. three-way pipe; 81. solenoid valve; 82. discharge pipe; 83. discharge valve. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] Waste heat resources refer to the heat energy contained in exhaust gas, drainage liquid and high-temperature materials to be cooled at a certain temperature, or the energy that can be recovered and reused under current conditions but has not yet been recovered.

[0033] The existing waste heat recovery system of a power plant introduces the high-temperature flue gas generated by the boiler into the waste heat recovery system, recovers the waste heat of the high-temperature flue gas in the waste heat recovery system, and uses the recovered waste heat to heat water, which is then supplied to cities or other projects for use.

[0034] However, after the high-temperature flue gas heats the water to a certain temperature, the hot water needs to be discharged. When discharging the hot water, if cold water continues to be added to the circulation pipe, the discharge temperature of the hot water will be lowered. When cold water is added to the circulation pipe of the stop box, the waste heat of the high-temperature flue gas cannot be converted into the water, thereby reducing the heat conversion efficiency.

[0035] Example 1, please refer to Figure 1 and Figure 3, an embodiment of the present application provides a waste heat recovery and reuse system, a waste heat recovery and reuse system includes a heat conversion box 10, a circulation module, a purification module, a water supply module and a controller 1, the circulation module includes a first air inlet pipe 11, a first air outlet pipe 12, a first water inlet pipe 13, a first water outlet pipe 14 and a first water tank 15, the heat conversion box 10 is provided with a first water inlet hole, a first water outlet, a first air inlet and a first air outlet, the first air inlet pipe 11 is connected to the heat conversion box 10 through the first air inlet, the first air outlet pipe 12 is connected to the heat conversion box 10 through the first air outlet, one end of the first water inlet pipe 13 is connected to the heat conversion box 10 through the first water inlet, and the other end is connected to the first water tank 15; the first water outlet pipe 14 is connected to the heat conversion box 10 through the first water outlet, and the other end is connected to the first water tank 15. a water tank 15; the input end of the purification module is connected to the end of the first air outlet pipe 12 away from the heat conversion box 10, the water supply module is connected to the first water tank 15, the first water inlet pipe 13 is connected to the first water pump 131 and the first electrically controlled ball valve 132, the first water outlet pipe 14 is connected to the second electrically controlled ball valve 142 and the second water pump 141, the first water tank 15 is provided with a first temperature sensor 151, the first water tank 15 is connected to the first drain pipe 152, the first drain pipe 152 is connected to the third electrically controlled ball valve 154 and the third water pump 153, the first water pump 131, the first electrically controlled ball valve 132, the second electrically controlled ball valve 142, the second water pump 141, the third electrically controlled ball valve 154, the third water pump 153 and the first temperature sensor 151 are all connected to the controller 1 in electrical signal connection;

[0036] The circulation module also includes a second water inlet pipe 16, a second water outlet pipe 17 and a second water tank 18. One end of the second water inlet pipe 16 is connected to the heat conversion box 10 through a second water inlet, and the other end is connected to the second water tank 18; the second water outlet pipe 17 is connected to the heat conversion box 10 through a second water outlet, and the other end is connected to the second water tank 18; the second water inlet pipe 16 is connected to a fourth water pump 161 and a fourth electric control ball valve 162, and the second water outlet pipe 17 is connected to a fifth electric control ball valve Valve 172 and the fifth water pump 171, the second water tank 18 is provided with a second temperature sensor 181, the second water tank 18 is connected to a second drain pipe 182, the second drain pipe 182 is connected to a sixth electrically-controlled ball valve 183 and a sixth water pump 184, the fourth water pump 161, the fourth electrically-controlled ball valve 162, the fifth electrically-controlled ball valve 172, the fifth water pump 171, the sixth electrically-controlled ball valve 183, the sixth water pump 184 and the second temperature sensor 181 are all connected to the controller 1 with electrical signals.

[0037] As can be seen from the above, in a waste heat recovery and reuse system provided by an embodiment of the present application, when the waste heat is recovered, the high-temperature flue gas with waste heat is charged into the heat conversion box 10 through the first air inlet pipe 11, and the water supply module injects water into the first water tank 15 and the second water tank 18. The controller 1 controls the first electrically-controlled ball valve 132 and the first water pump 131 to be opened, and the first water pump 131 injects the water in the first water tank 15 into the heat conversion box 10 through the first water inlet pipe 13. The water is heated in the heat conversion box 10 and circulated to the first water tank 15 through the first water outlet pipe 14 and the second water pump 141. When the first temperature sensor 151 detects that the temperature in the first water tank 15 rises to a preset value, the controller 1 controls the first electrically-controlled ball valve 132, the second electrically-controlled ball valve 142, the first water pump 131 to and the second water pump 141 stops running, at this time, the controller 1 controls the fourth electrically-controlled ball valve 162, the fifth electrically-controlled ball valve 172, the fourth water pump 161 and the fifth water pump 171 to open, and at the same time, the controller 1 controls the third water pump 153 and the third electrically-controlled ball valve 154 to open, the heated water in the first water tank 15 is discharged, the sixth water pump 184 and the sixth electrically-controlled ball valve 183 are closed, and the unheated water in the second water tank 18 enters the heat conversion box 10 for heating; when the water in the first water tank 15 is discharged, water is injected into the first water tank 15 of the water supply module box, and when the second temperature sensor 181 detects that the temperature in the second water tank 18 rises to a preset value, the water in the second water tank 18 is discharged, and at this time, the water in the first water tank 15 enters the heat conversion box 10 for circulating heating.

[0038] When the heat of the high-temperature flue gas is recovered and utilized, the water in the first water tank 15 and the second water tank 18 is alternately circulated and heated in the heat conversion box 10, so that the instantaneous heat conversion between the high-temperature flue gas and water is achieved, thereby improving the heat conversion efficiency.

[0039] Optionally, in some embodiments, please refer to Figure 1 and Figure 3 The purification module includes a purification chamber 21, a first connecting pipe 22, an induced draft fan 23 and a chimney 24. The input end of the purification chamber 21 is connected to the end of the first exhaust pipe 12 away from the heat conversion box 10, and the output end of the purification chamber 21 is connected to the chimney 24 through the first connecting pipe 22. The induced draft fan 23 is arranged in the first connecting pipe 22.

[0040] With such arrangement, the flue gas after heat conversion in the heat conversion box 10 is purified through the purification chamber 21, passes through the first connecting pipe 22 under the action of the induced draft fan 23, and is discharged into the atmosphere through the chimney 24. Due to the arrangement of the purification chamber 21, harmful substances in the flue gas are filtered, thereby reducing the probability of air pollution by the flue gas.

[0041] Optionally, refer to Figure 1 and Figure 3The water supply module includes a water softener 31, a second connecting pipe 32, a third connecting pipe 33, a seventh electrically-controlled ball valve 34 and an eighth electrically-controlled ball valve 35, one end of the second connecting pipe 32 is connected to the first water tank 15, the other end of the second connecting pipe 32 is connected to the water softener 31, one end of the third connecting pipe 33 is connected to the second water tank 18, the other end of the third connecting pipe 33 is connected to the water softener 31, the seventh electrically-controlled ball valve 34 is arranged on the second connecting pipe 32, the eighth electrically-controlled ball valve 35 is arranged on the third connecting pipe 33, and the seventh electrically-controlled ball valve 34 and the eighth electrically-controlled ball valve 35 are both connected to the controller 1 with electrical signals.

[0042] With such arrangement, the water softener 31 softens the water entering the first water tank 15 and the second water tank 18 and filters out impurities in the water. When the water in the first water tank 15 is heated to a certain temperature, the hot water is discharged through the first drain pipe 152, and the water in the second water tank 18 enters the heat conversion tank 10 for circulating heating. When the water in the first water tank 15 is drained, the controller 1 controls the seventh electrically-controlled ball valve 34 to open and add water to the first water tank 15. When the water in the second water tank 18 is heated, it is discharged through the second drain pipe 182. When the water in the second water tank 18 is drained, the controller 1 controls the eighth electrically-controlled ball valve 35 to add water to the second water tank.

[0043] Optionally, see Figure 1 The first water inlet pipe 13 and the second water inlet pipe 16 in the heat conversion box 10 are both spiral.

[0044] In this way, the spiral first water inlet pipe 13 and the second water inlet pipe 16 are arranged in the heat conversion box 10, so that the water in the water pipes can stay in the heat conversion box 10 for a longer time, thereby improving the heating rate of the water.

[0045] Embodiment 2, the present application embodiment also provides a power generation system, referring to Figure 2 and Figure 3 , a power generation system, applying the waste heat recovery and reuse system as described in Example 1, also includes a blast furnace 4, a steam generator 5, a first water supply pipe 6 and a steam turbine 7, the steam generator 5 is connected to the blast furnace 4, one end of the first water supply pipe 6 is connected to the water softener 31, the other end of the first water supply pipe 6 is connected to the steam generator 5, the air inlet end of the steam turbine 7 is connected to the air outlet end of the steam generator 5, and the end of the first air inlet pipe 11 away from the heat conversion box 10 is connected to the blast furnace 4.

[0046] With such arrangement, the water softener 31 transports water to the steam generator 5 through the first water supply pipe 6, the blast furnace 4 provides a heat source to the steam generator 5, the steam generator 5 produces steam to provide power to the steam turbine, the steam turbine 7 drives the generator to generate electricity, and the high-temperature flue gas generated by the blast furnace 4 is recycled and utilized through the waste heat recovery and reuse system, thereby improving the utilization efficiency of energy.

[0047] In some embodiments, reference Figure 2 and Figure 3 One end of the third electrically-controlled ball valve 154 away from the first water tank 15 and one end of the sixth electrically-controlled ball valve 183 away from the second water tank 18 are connected to a three-way pipe 8, the three-way pipe 8 is connected to the steam generator 5, and the three-way pipe 8 is connected to a solenoid valve 81, and the solenoid valve 81 is electrically signal-connected to the controller 1.

[0048] In this way, when the water temperature in the first water tank 15 reaches a preset value, the controller 1 controls the third water pump 153, the third electrically controlled ball valve 154 and the solenoid valve 81 to open, and the high-temperature water is delivered to the steam generator 5 through the three-way pipe 8; when the water temperature in the second water tank 18 reaches a preset value, the controller 1 controls the sixth water pump 184, the sixth electrically controlled ball valve 183 and the solenoid valve 81 to open, and the high-temperature water is delivered to the steam generator 5 through the three-way pipe 8; when the water source is provided in the steam generator 5, the water is heated in advance by recovering waste heat, thereby improving the working efficiency of the steam generator 5, saving the energy consumed by the blast furnace 4, and improving the power generation efficiency.

[0049] In some embodiments, reference Figure 2 and Figure 3 The three-way pipe 8 is also connected to a discharge pipe 82 , and the discharge pipe 82 is connected to a discharge valve 83 .

[0050] With such arrangement, when more hot water is provided in the first water tank 15 or the second water tank 18, the controller 1 controls the third water pump 153, the third electrically-controlled ball valve 154, the sixth water pump 184, the sixth electrically-controlled ball valve 183 and the solenoid valve 81 to be closed, and manually opens the discharge valve 83 to transport the hot water to the urban area or other areas for people to use.

[0051] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste heat recovery and reuse system, characterized in that: The invention comprises a heat conversion box (10), a circulation module, a purification module, a water supply module and a controller (1); the circulation module comprises a first air inlet pipe (11), a first air outlet pipe (12), a first water inlet pipe (13), a first water outlet pipe (14), a first water tank (15), a second water inlet pipe (16), a second water outlet pipe (17) and a second water tank (18); the heat conversion box (10) is provided with a first water inlet hole, a first water outlet, a first air inlet and a first air outlet; the first air inlet pipe (11) ) is connected to the heat conversion box (10) through the first air inlet, the first air outlet pipe (12) is connected to the heat conversion box (10) through the first air outlet, one end of the first water inlet pipe (13) is connected to the heat conversion box (10) through the first water inlet, and the other end is connected to the first water tank (15); the first water outlet pipe (14) is connected to the heat conversion box (10) through the first water outlet, and the other end is connected to the first water tank (15); one end of the second water inlet pipe (16) is connected to the heat conversion box (10) through the second water inlet The second water inlet pipe (16) is connected to the heat conversion box (10), and the other end is connected to the second water tank (18); the second water outlet pipe (17) is connected to the heat conversion box (10) through the second water outlet, and the other end is connected to the second water tank (18); the second water inlet pipe (16) is connected to a fourth water pump (161) and a fourth electrically controlled ball valve (162); the second water outlet pipe (17) is connected to a fifth electrically controlled ball valve (172) and a fifth water pump (171); the second water tank (18) is provided with a second a temperature sensor (181); the second water tank (18) is connected to a second drain pipe (182); the second drain pipe (182) is connected to a sixth electrically controlled ball valve (183) and a sixth water pump (184); the fourth water pump (161), the fourth electrically controlled ball valve (162), the fifth electrically controlled ball valve (172), the fifth water pump (171), the sixth electrically controlled ball valve (183), the sixth water pump (184) and the second temperature sensor (181) are all electrically signal-connected to the controller (1); The purification module comprises a purification chamber (21), a first connecting pipe (22), an induced draft fan (23) and a chimney (24); the input end of the purification chamber (21) is connected to an end of the first air outlet pipe (12) away from the heat conversion box (10); the output end of the purification chamber (21) is connected to the chimney (24) via the first connecting pipe (22); and the induced draft fan (23) is arranged in the first connecting pipe (22); The water supply module is in communication with the first water tank (15); the first water inlet pipe (13) is connected to a first water pump (131) and a first electrically controlled ball valve (132); the first water outlet pipe (14) is connected to a second electrically controlled ball valve (142) and a second water pump (141); a first temperature sensor (151) is arranged in the first water tank (15); the first water tank (15) is connected to a first drain pipe (152); the first drain pipe (152) is connected to a third electrically controlled ball valve (154) and a third water pump (153); the first water pump (131), the first electrically controlled ball valve (132), the second electrically controlled ball valve (142), the second water pump (141), the third electrically controlled ball valve (154), the third water pump (153) and the first temperature sensor (151) are all electrically signal-connected to a controller (1).

2. The waste heat recovery and reuse system according to claim 1, characterized in that: The water supply module comprises a water softener (31), a second connecting pipe (32), a third connecting pipe (33), a seventh electrically controlled ball valve (34) and an eighth electrically controlled ball valve (35); one end of the second connecting pipe (32) is in communication with the first water tank (15), the other end of the second connecting pipe (32) is connected to the water softener (31); one end of the third connecting pipe (33) is in communication with the second water tank (18), the other end of the third connecting pipe (33) is connected to the water softener (31); the seventh electrically controlled ball valve (34) is arranged on the second connecting pipe (32), the eighth electrically controlled ball valve (35) is arranged on the third connecting pipe (33); the seventh electrically controlled ball valve (34) and the eighth electrically controlled ball valve (35) are both electrically connected to the controller (1) via signals.

3. A waste heat recovery and reuse system according to claim 2, characterized in that: The first water inlet pipe (13) and the second water inlet pipe (16) in the heat conversion box (10) are both spiral-shaped.

4. A power generation system, using the waste heat recovery and reuse system according to any one of claims 2 to 3, characterized in that: It also comprises a blast furnace (4), a steam generator (5), a first water supply pipe (6) and a steam turbine (7), wherein the steam generator (5) is connected to the blast furnace (4), one end of the first water supply pipe (6) is connected to the water softener (31), the other end of the first water supply pipe (6) is connected to the steam generator (5), the air inlet end of the steam turbine (7) is connected to the air outlet end of the steam generator (5), and the end of the first air inlet pipe (11) away from the heat conversion box (10) is connected to the blast furnace (4).

5. A power generation system according to claim 4, characterized in that: One end of the third electrically controlled ball valve (154) away from the first water tank (15) and one end of the sixth electrically controlled ball valve (183) away from the second water tank (18) are connected to a three-way pipe (8), the three-way pipe (8) is connected to the steam generator (5), the three-way pipe (8) is connected to a solenoid valve (81), and the solenoid valve (81) is connected to the controller (1) via an electrical signal.

6. A power generation system according to claim 5, characterized in that: The three-way pipe (8) is also connected to a discharge pipe (82), and the discharge pipe (82) is connected to a discharge valve (83).

Images