Waste heat utilization system for sintering ring cooling medium and low temperature waste gas

Abstract

The utility model discloses a sintering ring cooling medium and low temperature waste gas waste heat utilization system, the waste heat utilization system comprises a ring cooler and a waste heat double-effect utilization device, the waste heat double-effect utilization device comprises a steam generation chamber and a hot water generation chamber, a steam generation mechanism is arranged in the steam generation chamber, and a hot water generation mechanism is arranged in the hot water generation chamber. A hot water generating mechanism is arranged in the hot water generating chamber. According to the waste heat double-effect utilization device, water vapor and hot water which can be directly utilized in a factory are obtained by utilizing waste heat in the ring cooling waste gas, and the waste gas can be reduced to be below 150 DEG C, so that the waste gas can be directly returned to a sintering process to be used, and finally, high-efficiency utilization and near-zero emission of the ring cooling medium-low temperature waste gas are realized. In addition, the device is simple in overall structure, convenient to operate, low in investment and space occupation, good in waste heat utilization effect, high in practicability and capable of being flexibly adjusted to adapt to different seasons and regions.

Description

Technical Field

[0001] The utility model relates to a sintering ring cooling waste gas utilization technology, in particular to a waste heat utilization system of low-temperature waste gas from sintering ring cooling, belonging to the technical field of sintering ring cooling waste gas utilization. Background Art

[0002] During the sintering process, the temperature of the sinter cake after it is unloaded from the sintering machine can reach 700-800°C. The sensible heat it carries is the most important component of the sintering waste heat resource. During the air cooling process, the sinter temperature drops below 150°C, generating a large amount of hot air. Generally, the temperature of the cooling exhaust gas from different parts of the sintering ring cooler varies, gradually decreasing from the receiving end to the discharge end. It is generally divided into three sections: a high-temperature zone above 250°C, a medium-temperature zone between 150°C and 250°C, and a low-temperature zone below 150°C. In actual production, many companies have installed supporting sintering waste heat recovery systems to utilize the high-temperature cooling exhaust gas from the ring cooler for waste heat power generation. However, the cooling exhaust gas from the medium and low-temperature sections (≤250°C) is not effectively utilized and is sometimes directly discharged into the atmosphere through the chimney, wasting energy and polluting the environment. In addition, the medium and low temperature exhaust gas is directly returned to the sintering process instead of air. Although the waste heat of the exhaust gas can be utilized to a certain extent from an energy perspective, the high temperature of the cooling exhaust gas and the volume expansion lead to a decrease in the oxygen concentration, resulting in a decrease in the amount of oxygen drawn into the sintering material layer, which is not conducive to fuel combustion and affects the quality of sintered minerals. Therefore, when the exhaust gas is returned to the sintering process, it must be cooled to below 150°C by adding cold air, which will increase the amount of low temperature hot exhaust gas and may exceed the actual demand for sintering. Utility Model Content

[0003] In response to the problems in the existing technology of low utilization efficiency or even direct emission of low-temperature exhaust gas from sintering ring cooling, which leads to environmental pollution and waste heat, the utility model provides a waste heat utilization system for low-temperature exhaust gas from sintering ring cooling. By transporting the low-temperature exhaust gas from sintering ring cooling into a waste heat dual-effect utilization device, the waste heat in the exhaust gas is used to produce water vapor and hot water that can be directly used within the factory according to actual needs, and the low-temperature exhaust gas can be reduced to below 150°C, and then directly returned to the sintering process for use, ultimately achieving efficient utilization and near-zero emissions of low-temperature exhaust gas from ring cooling.

[0004] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are specifically described as follows:

[0005] A waste heat recovery system for low-temperature exhaust gas from sintering ring cooling, comprising a ring cooler and a dual-effect waste heat recovery device. The dual-effect waste heat recovery device comprises a housing and an inner chamber, the inner chamber being divided by a central partition into a steam generation chamber and a hot water generation chamber. The steam generation chamber and the hot water generation chamber are arranged side by side and both are connected to the ring cooler's exhaust gas recycling pipeline via an exhaust gas inlet. A steam generating mechanism is located within the steam generation chamber, and a hot water generating mechanism is located within the hot water generation chamber.

[0006] Preferably, the steam generating mechanism includes a low-parameter steam superheater, a low-parameter evaporator, and an economizer. The low-parameter steam superheater, low-parameter evaporator, and economizer are arranged sequentially from bottom to top within the steam generating chamber. The front end of the low-parameter steam superheater is connected to a steam drum located outside the shell via a pipeline, and its rear end is connected to the plant's low-parameter steam utilization pipeline network. Both ends of the low-parameter evaporator are connected to the steam drum. The front end of the economizer is connected to the plant's desalted water pipeline network, and its rear end is connected to the steam drum.

[0007] Preferably, a plurality of independent steam generating mechanisms are provided in the steam generating chamber, and the plurality of steam generating mechanisms are independently connected to external steam drums or share the same steam drum.

[0008] Preferably, the hot water generating mechanism is a hot water heater disposed in the hot water generating chamber, the front end of the hot water heater being connected to the industrial water network of the factory area, and the rear end thereof being connected to the hot water utilization network of the factory area.

[0009] Preferably, the hot water generating mechanism includes a plurality of independent hot water heaters, the front ends of the plurality of hot water heaters are independently connected to the industrial water network of the factory, and the rear ends thereof are independently connected to the hot water utilization network of the factory.

[0010] Preferably, a first electric valve is provided at the bottom of the steam generating chamber, and a second electric valve is provided at the top of the steam generating chamber. A third electric valve is provided at the bottom of the hot water generating chamber. The first electric valve regulates the opening of the steam generating chamber's air inlet, the second electric valve regulates the opening of the steam generating chamber's air outlet, and the third electric valve regulates the opening of the hot water generating chamber's air inlet.

[0011] Preferably, the vertical height of the steam generating chamber is lower than that of the hot water generating chamber. The top of the steam generating chamber is connected to the upper chamber of the hot water generating chamber via a second electric valve. The upper chamber of the hot water generating chamber is provided with at least one hot water heater, and the exhaust port at the top of the upper chamber of the hot water generating chamber is connected to an exhaust gas discharge pipe.

[0012] Preferably, the vertical height of the steam generating chamber is 0.5 to 0.7 times the vertical height of the hot water generating chamber. The vertical height of the central partition is consistent with the vertical height of the steam generating chamber.

[0013] Preferably, a gas mixing and diversion chamber is provided at the bottom of the waste heat dual-effect utilization device, the gas mixing and diversion chamber has an air inlet connected to the waste gas inlet, and an exhaust end connected to the gas inlets of the steam generating chamber and the hot water generating chamber.

[0014] Preferably, independent exhaust gas temperature sensors are provided in both the steam generating chamber and the hot water generating chamber.

[0015] Preferably, the exhaust port of the low temperature section of the ring cooler is connected to the cooling air inlet of the medium temperature section of the ring cooler through the waste gas recycling pipeline, and the exhaust port of the medium temperature section of the ring cooler is connected to the waste gas inlet.

[0016] In the present invention, a waste heat dual-effect utilization device is directly connected to the medium and low temperature exhaust gas outlet of the ring cooler. The waste heat dual-effect utilization device selectively diverts the medium and low temperature exhaust gas from the ring cooler and uses it to produce low-parameter water vapor (which can be used as a raw material for other processes in the plant, or further used to produce high-parameter steam for utilization) and industrial hot water (which can be used as a raw material for other processes in the plant or as water for workers to wash). At the same time, the temperature of the medium and low temperature exhaust gas from the ring cooler is reduced to below 150°C. The oxygen concentration of the exhaust gas after cooling is close to the oxygen concentration in air at room temperature, so it can be directly circulated to the sintering process for complete consumption. In other words, while achieving efficient utilization of the waste heat of the medium and low temperature exhaust gas from the ring cooler, the present invention also lays the foundation for near-zero emissions of the medium and low temperature exhaust gas from the ring cooler.

[0017] In the present invention, a central partition is provided in the waste heat dual-effect utilization device to separate its inner cavity into a steam generating chamber and a hot water generating chamber which are independent of each other. The steam generating chamber and the hot water generating chamber are independently fed with exhaust gas (the exhaust gas entry ratio is coordinated and adjusted by the first electric valve, the second electric valve and the third electric valve, and is allocated according to actual needs. For example, in summer, the demand for hot water in the factory is relatively low, so as much exhaust gas as possible is used for heat exchange to obtain water vapor. In winter, the demand for hot water in the factory is relatively high, so as much exhaust gas as possible is used for heat exchange to obtain industrial hot water). A steam generating mechanism is provided in the steam generating chamber for exchanging heat with the exhaust gas entering the steam generating chamber to obtain water vapor. A hot water generating mechanism is provided in the hot water generating chamber for exchanging heat with the exhaust gas entering the hot water generating chamber to obtain industrial hot water (the obtained industrial hot water can be recycled as a raw material for the steam generating mechanism for further heat exchange with the exhaust gas to obtain water vapor).

[0018] In this utility model, to further enhance heat exchange with the exhaust gas while ensuring the quality of steam and hot water, multiple steam generating mechanisms are installed within the steam generation chamber, and multiple hot water heaters are installed within the hot water generation chamber. When the temperature and volume of the low-temperature exhaust gas fluctuate, the number of steam generating mechanisms and hot water heaters activated is adjusted accordingly, thereby ensuring the quality of the steam and hot water while ensuring that the temperature of the exhaust gas after heat exchange meets the requirements for return to the sintering process. Furthermore, multiple exhaust gas temperature sensors are independently installed in the steam generation chamber and the hot water generation chamber to monitor the exhaust gas temperature in real time, thereby facilitating precise feedback and adjustment of the number of steam generating mechanisms and hot water heaters activated.

[0019] In the present invention, the vertical height of the steam generating chamber is lower than the vertical height of the hot water generating chamber, and the top of the steam generating chamber is connected to the upper chamber of the hot water generating chamber through a second electric valve. That is to say, the exhaust gas entering the steam generating chamber and the exhaust gas entering the hot water generating chamber are finally mixed and homogenized in the upper chamber of the hot water generating chamber and then discharged from the exhaust port on the top of the upper chamber, and transported to the sintering process for recycling through the exhaust gas exhaust pipe.

[0020] In the present invention, a gas mixing and diversion chamber is also provided at the bottom of the waste heat dual-effect utilization device. The gas mixing and diversion chamber can be used to mix and homogenize the low-temperature exhaust gas from the ring cooling and then transported to the steam generating chamber and the hot water generating chamber for heat exchange, which is beneficial to ensure the stability of heat exchange.

[0021] In the present invention, the low-temperature exhaust gas from the low-temperature section of the ring cooling is used as the cooling medium for the medium-temperature section of the ring cooling, and the material is cooled and heat-exchanged upward to obtain the medium-temperature exhaust gas of the ring cooling; that is, by recycling the low-temperature exhaust gas, on the one hand, the direct discharge of the low-temperature exhaust gas can be completely avoided, and the temperature of the medium-temperature exhaust gas of the ring cooling, which originally has a temperature between 150°C and 250°C, can be increased to 200°C to 300°C, thereby achieving the enrichment of the sensible heat of the material and facilitating the efficient recovery of subsequent heat; on the other hand, by fully or partially replacing the cold air entering the medium-temperature section of the ring cooling, the total amount of cold air used for cooling by the ring cooler is significantly reduced, and thus the output of hot exhaust gas is significantly reduced, and ultimately the heat discharged with the exhaust gas is also significantly reduced.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0023] 1: The utility model uses a waste heat dual-effect utilization device to achieve efficient utilization of the waste heat of the ring-cooled medium and low-temperature exhaust gas, while also reducing the medium and low-temperature exhaust gas to below 150°C, which can then be directly returned to the sintering process for use, ultimately achieving efficient utilization and near-zero emissions of the ring-cooled medium and low-temperature exhaust gas.

[0024] 2: The utility model has a simple overall structure, convenient operation, low investment and space occupancy, good waste heat utilization effect, strong practicality, and can be flexibly adjusted to adapt to different seasons and regions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the system of the present invention.

[0026] Figure 2 It is a structural schematic diagram of the waste heat dual-effect utilization device described in this utility model.

[0027] Figure markings: 1: Annular cooler; 101: Waste gas recycling pipeline; 2: Waste heat dual-effect utilization device; 201: Central partition; 202: Steam generating chamber; 203: Hot water generating chamber; 204: Waste gas inlet; 205: Low-parameter steam superheater; 206: Low-parameter evaporator; 207: Economizer; 208: Steam drum; 209: Plant area low-parameter steam utilization pipeline network; 210: Hot water heater; 211: Plant area industrial water pipeline network; 212: Plant area hot water utilization pipeline network; 213: First electric valve; 214: Second electric valve; 215: Third electric valve; 216: Waste gas exhaust pipeline; 217: Mixed gas diversion chamber; 218: Waste gas temperature sensor; 219: Plant area desalted water pipeline network. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0029] A waste heat recovery system for low-temperature waste gas from sintering ring cooling is disclosed. The system comprises a ring cooler 1 and a waste heat dual-effect recovery device 2. The device 2 comprises a housing and an inner chamber, which is divided by a central partition 201 into a steam generation chamber 202 and a hot water generation chamber 203. The steam generation chamber 202 and the hot water generation chamber 203 are arranged side by side and are both connected to the waste gas recycling pipeline of the ring cooler 1 via a waste gas inlet 204. The steam generation chamber 202 houses a steam generator, while the hot water generation chamber 203 houses a hot water generator.

[0030] Preferably, the steam generating mechanism includes a low-parameter steam superheater 205, a low-parameter evaporator 206 and an economizer 207. The low-parameter steam superheater 205, the low-parameter evaporator 206 and the economizer 207 are arranged in sequence from bottom to top in the steam generating chamber 202. The front end of the low-parameter steam superheater 205 is connected to the steam drum 208 located outside the shell through a pipeline, and the rear end thereof is connected to the low-parameter steam utilization pipeline network 209 in the plant area. Both ends of the low-parameter evaporator 206 are connected to the steam drum 208. The front end of the economizer 207 is connected to the desalted water pipeline network 219 in the plant area, and the rear end thereof is connected to the steam drum 208.

[0031] Preferably, a plurality of independent steam generating mechanisms are provided in the steam generating chamber 202 , and the plurality of steam generating mechanisms are independently connected to the steam drum 208 or share the same steam drum 208 .

[0032] Preferably, the hot water generating mechanism is a hot water heater 210 disposed in the hot water generating chamber 203. The front end of the hot water heater 210 is connected to the industrial water network 211 of the factory area, and the rear end is connected to the hot water utilization network 212 of the factory area.

[0033] Preferably, the hot water generating mechanism includes multiple independent hot water heaters 210, the front ends of the multiple hot water heaters 210 are independently connected to the factory industrial water network 211, and their rear ends are independently connected to the factory hot water utilization network 212.

[0034] Preferably, a first electric valve 213 is provided at the bottom of the steam generating chamber 202, and a second electric valve 214 is provided at the top of the steam generating chamber 202. A third electric valve 215 is provided at the bottom of the hot water generating chamber 203. The opening of the air inlet of the steam generating chamber 202 is adjusted by the first electric valve 213, the opening of the air outlet of the steam generating chamber 202 is adjusted by the second electric valve 214, and the opening of the air inlet of the hot water generating chamber 203 is adjusted by the third electric valve 215.

[0035] Preferably, the vertical height of the steam generating chamber 202 is lower than that of the hot water generating chamber 203. The top of the steam generating chamber 202 is connected to the upper chamber of the hot water generating chamber 203 via a second electric valve 214. The upper chamber of the hot water generating chamber 203 is equipped with at least one hot water heater 210, and the exhaust port at the top of the upper chamber of the hot water generating chamber 203 is connected to an exhaust gas discharge pipe 216.

[0036] Preferably, the vertical height of the steam generating chamber 202 is 0.5 to 0.7 times the vertical height of the hot water generating chamber 203. The vertical height of the central partition 201 is consistent with the vertical height of the steam generating chamber 202.

[0037] Preferably, a gas mixing and diversion chamber 217 is further provided at the bottom of the waste heat dual-effect utilization device 2. The air inlet end of the gas mixing and diversion chamber 217 is connected to the exhaust gas inlet 204, and the exhaust end of the gas mixing and diversion chamber 217 is connected to the air inlet ends of the steam generating chamber 202 and the hot water generating chamber 203.

[0038] Preferably, independent exhaust gas temperature sensors 218 are provided in both the steam generating chamber 202 and the hot water generating chamber 203 .

[0039] Preferably, the exhaust port of the low temperature section of the ring cooler 1 is connected to the cooling air inlet of the medium temperature section of the ring cooler 1 through the waste gas recycling pipe 101, and the exhaust port of the medium temperature section of the ring cooler 1 is connected to the waste gas inlet 204.

[0040] Example 1

[0041] like Figure 1-2 The figure shows a waste heat utilization system for low-temperature waste gas from sintering ring cooling. The waste heat utilization system includes a ring cooler 1 and a waste heat dual-effect utilization device 2. The waste heat dual-effect utilization device 2 includes a housing and an inner cavity, which is divided into a steam generation chamber 202 and a hot water generation chamber 203 by a central partition 201. The steam generation chamber 202 and the hot water generation chamber 203 are arranged side by side and are both connected to the waste gas recycling pipeline of the ring cooler 1 through the waste gas inlet 204. The steam generation chamber 202 is equipped with a steam generator, and the hot water generation chamber 203 is equipped with a hot water generator.

[0042] Example 2

[0043] Example 1 is repeated, except that the steam generating mechanism includes a low-parameter steam superheater 205, a low-parameter evaporator 206 and an economizer 207. The low-parameter steam superheater 205, the low-parameter evaporator 206 and the economizer 207 are arranged in sequence from bottom to top in the steam generating chamber 202. The front end of the low-parameter steam superheater 205 is connected to the steam drum 208 located outside the shell through a pipeline, and the rear end thereof is connected to the low-parameter steam utilization pipeline network 209 in the plant area. Both ends of the low-parameter evaporator 206 are connected to the steam drum 208. The front end of the economizer 207 is connected to the desalted water pipeline network 219 in the plant area, and the rear end thereof is connected to the steam drum 208.

[0044] Example 3

[0045] Example 2 is repeated, except that a plurality of independent steam generating mechanisms are provided in the steam generating chamber 202 , and each of the plurality of steam generating mechanisms is independently connected to a steam drum 208 .

[0046] Example 4

[0047] Repeat Example 3, except that multiple groups of steam generating mechanisms share the same steam drum 208.

[0048] Example 5

[0049] Repeat Example 4, except that the hot water generating mechanism is a hot water heater 210 disposed in the hot water generating chamber 203. The front end of the hot water heater 210 is connected to the industrial water network 211 of the factory area, and the rear end is connected to the hot water utilization network 212 of the factory area.

[0050] Example 6

[0051] Repeat Example 5, except that the hot water generating mechanism includes multiple independent hot water heaters 210, the front ends of the multiple hot water heaters 210 are independently connected to the factory industrial water network 211, and their rear ends are independently connected to the factory hot water utilization network 212.

[0052] Example 7

[0053] Example 6 is repeated, except that a first electric valve 213 is provided at the bottom of the steam generating chamber 202, and a second electric valve 214 is provided at the top of the steam generating chamber 202. A third electric valve 215 is provided at the bottom of the hot water generating chamber 203. The opening of the air inlet of the steam generating chamber 202 is adjusted by the first electric valve 213, the opening of the air outlet of the steam generating chamber 202 is adjusted by the second electric valve 214, and the opening of the air inlet of the hot water generating chamber 203 is adjusted by the third electric valve 215.

[0054] Example 8

[0055] Example 7 was repeated, except that the vertical height of the steam generating chamber 202 was lower than that of the hot water generating chamber 203. The top of the steam generating chamber 202 was connected to the upper chamber of the hot water generating chamber 203 via a second electric valve 214. The upper chamber of the hot water generating chamber 203 was equipped with at least one hot water heater 210, and the exhaust port at the top of the upper chamber of the hot water generating chamber 203 was connected to an exhaust gas discharge pipe 216.

[0056] Example 9

[0057] The embodiment 8 is repeated except that the vertical height of the steam generating chamber 202 is 0.5 to 0.7 times the vertical height of the hot water generating chamber 203. The vertical height of the central partition 201 is consistent with the vertical height of the steam generating chamber 202.

[0058] Example 10

[0059] Example 9 is repeated, except that a gas mixing and diversion chamber 217 is further provided at the bottom of the waste heat dual-effect utilization device 2. The gas inlet end of the gas mixing and diversion chamber 217 is connected to the exhaust gas inlet 204, and the gas outlet end of the gas mixing and diversion chamber 217 is connected to the gas inlet ends of the steam generating chamber 202 and the hot water generating chamber 203.

[0060] Example 11

[0061] Example 10 is repeated, except that independent exhaust gas temperature sensors 218 are provided in both the steam generating chamber 202 and the hot water generating chamber 203 .

[0062] Example 12

[0063] Example 11 is repeated, except that the exhaust port of the low temperature section of the ring cooler 1 is connected to the cooling air inlet of the medium temperature section of the ring cooler 1 through the exhaust gas recycling pipe 101, and the exhaust port of the medium temperature section of the ring cooler 1 is connected to the exhaust gas inlet 204.

Claims

1. A waste heat utilization system for low-temperature exhaust gas from sintering ring cooling, characterized by: The waste heat utilization system comprises a ring cooler (1) and a waste heat double-effect utilization device (2); the waste heat double-effect utilization device (2) comprises a shell and an inner cavity, wherein the inner cavity is divided into a steam generating chamber (202) and a hot water generating chamber (203) by a central partition (201); the steam generating chamber (202) and the hot water generating chamber (203) are arranged in parallel and are both connected to the waste gas recycling pipe (101) of the ring cooler (1) through a waste gas inlet (204); a steam generating mechanism is arranged in the steam generating chamber (202), and a hot water generating mechanism is arranged in the hot water generating chamber (203).

2. The waste heat utilization system according to claim 1, characterized in that: The steam generating mechanism comprises a low-parameter steam superheater (205), a low-parameter evaporator (206) and an economizer (207); the low-parameter steam superheater (205), the low-parameter evaporator (206) and the economizer (207) are arranged in sequence from bottom to top in the steam generating chamber (202); the front end of the low-parameter steam superheater (205) is connected to a steam drum (208) located outside the shell through a pipeline, and the rear end thereof is connected to a low-parameter steam utilization pipeline network (209) in the plant area; both ends of the low-parameter evaporator (206) are connected to the steam drum (208); the front end of the economizer (207) is connected to a desalted water pipeline network (219) in the plant area, and the rear end thereof is connected to the steam drum (208).

3. The waste heat utilization system according to claim 2, characterized in that: A plurality of independent steam generating mechanisms are arranged in the steam generating chamber (202), and the plurality of steam generating mechanisms are independently connected to a steam drum (208) or share the same steam drum (208).

4. The waste heat utilization system according to any one of claims 1 to 3, characterized in that: The hot water generating mechanism is a hot water heater (210) arranged in the hot water generating chamber (203); the front end of the hot water heater (210) is connected to the industrial water pipe network (211) of the factory area, and the rear end is connected to the hot water utilization pipe network (212) of the factory area.

5. The waste heat utilization system according to claim 4, characterized in that: The hot water generating mechanism comprises a plurality of independent hot water heaters (210), the front ends of the plurality of hot water heaters (210) being independently connected to the industrial water network (211) of the plant area, and the rear ends thereof being independently connected to the hot water utilization network (212) of the plant area.

6. The waste heat utilization system according to any one of claims 1 to 3 and 5, characterized in that: A first electric valve (213) is provided at the bottom of the steam generating chamber (202), and a second electric valve (214) is provided at the top of the steam generating chamber (202); a third electric valve (215) is provided at the bottom of the hot water generating chamber (203); the opening of the air inlet of the steam generating chamber (202) is adjusted by the first electric valve (213), the opening of the air outlet of the steam generating chamber (202) is adjusted by the second electric valve (214), and the opening of the air inlet of the hot water generating chamber (203) is adjusted by the third electric valve (215).

7. The waste heat utilization system according to claim 4, characterized in that: A first electric valve (213) is provided at the bottom of the steam generating chamber (202), and a second electric valve (214) is provided at the top of the steam generating chamber (202); a third electric valve (215) is provided at the bottom of the hot water generating chamber (203); the opening of the air inlet of the steam generating chamber (202) is adjusted by the first electric valve (213), the opening of the air outlet of the steam generating chamber (202) is adjusted by the second electric valve (214), and the opening of the air inlet of the hot water generating chamber (203) is adjusted by the third electric valve (215).

8. The waste heat utilization system according to claim 6, characterized in that: The vertical height of the steam generating chamber (202) is lower than the vertical height of the hot water generating chamber (203); the top of the steam generating chamber (202) is connected to the upper chamber of the hot water generating chamber (203) via a second electric valve (214); the upper chamber of the hot water generating chamber (203) is provided with at least one hot water heater (210), and the exhaust port at the top of the upper chamber of the hot water generating chamber (203) is connected to an exhaust gas exhaust pipe (216).

9. The waste heat utilization system according to claim 7, characterized in that: The vertical height of the steam generating chamber (202) is lower than the vertical height of the hot water generating chamber (203); the top of the steam generating chamber (202) is connected to the upper chamber of the hot water generating chamber (203) via a second electric valve (214); the upper chamber of the hot water generating chamber (203) is provided with at least one hot water heater (210), and the exhaust port at the top of the upper chamber of the hot water generating chamber (203) is connected to an exhaust gas exhaust pipe (216).

10. The waste heat utilization system according to claim 8 or 9, characterized in that: The vertical height of the steam generating chamber (202) is 0.5 to 0.7 times the vertical height of the hot water generating chamber (203); and the vertical height of the central partition (201) is consistent with the vertical height of the steam generating chamber (202).

11. The waste heat utilization system according to claim 6, characterized in that: A gas mixing and diversion chamber (217) is also provided at the bottom of the waste heat dual-effect utilization device (2); the gas inlet end of the gas mixing and diversion chamber (217) is connected to the waste gas inlet (204), and the gas exhaust end of the gas mixing and diversion chamber (217) is connected to the gas inlet ends of the steam generation chamber (202) and the hot water generation chamber (203).

12. The waste heat utilization system according to any one of claims 7 to 9, characterized in that: A gas mixing and diversion chamber (217) is also provided at the bottom of the waste heat dual-effect utilization device (2); the gas inlet end of the gas mixing and diversion chamber (217) is connected to the waste gas inlet (204), and the gas exhaust end of the gas mixing and diversion chamber (217) is connected to the gas inlet ends of the steam generation chamber (202) and the hot water generation chamber (203).

13. The waste heat utilization system according to claim 10, characterized in that: A gas mixing and diversion chamber (217) is also provided at the bottom of the waste heat dual-effect utilization device (2); the gas inlet end of the gas mixing and diversion chamber (217) is connected to the waste gas inlet (204), and the gas exhaust end of the gas mixing and diversion chamber (217) is connected to the gas inlet ends of the steam generation chamber (202) and the hot water generation chamber (203).

14. The waste heat utilization system according to claim 6, characterized in that: Independent exhaust gas temperature sensors (218) are provided in the steam generation chamber (202) and the hot water generation chamber (203); and / or The exhaust port of the low-temperature section of the ring cooler (1) is connected to the cooling air inlet of the medium-temperature section of the ring cooler (1) through the waste gas recycling pipeline (101), and the exhaust port of the medium-temperature section of the ring cooler (1) is connected to the waste gas inlet (204).

15. The waste heat utilization system according to any one of claims 7 to 9, 11 and 13, characterized in that: Independent exhaust gas temperature sensors (218) are provided in the steam generation chamber (202) and the hot water generation chamber (203); and / or The exhaust port of the low-temperature section of the ring cooler (1) is connected to the cooling air inlet of the medium-temperature section of the ring cooler (1) through the waste gas recycling pipeline (101), and the exhaust port of the medium-temperature section of the ring cooler (1) is connected to the waste gas inlet (204).

16. The waste heat utilization system according to claim 10, characterized in that: Independent exhaust gas temperature sensors (218) are provided in the steam generation chamber (202) and the hot water generation chamber (203); and / or The exhaust port of the low-temperature section of the ring cooler (1) is connected to the cooling air inlet of the medium-temperature section of the ring cooler (1) through the waste gas recycling pipeline (101), and the exhaust port of the medium-temperature section of the ring cooler (1) is connected to the waste gas inlet (204).

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