Heat exchange system for sintering waste heat super-carbon power generation

Abstract

The present disclosure provides a heat exchange system for sintering waste heat super-carbon power generation, comprising: an inlet flue, an inlet end of the inlet flue being used for accessing flue gas output by a sintering circular cooler; a heat exchange flue, comprising a first heat exchange section, a mixing section and a second heat exchange section, the first heat exchange section being communicated between a flue gas outlet end of the inlet flue and the mixing section, the mixing section being used for delivering flue gas to the sintering circular cooler through the second heat exchange section; an injection flue, an inlet end of the injection flue being communicated with the inlet flue, and the inlet end of the injection flue being located between the inlet end of the inlet flue and the flue gas outlet end of the inlet flue, a flue gas outlet end of the injection flue being communicated with the mixing section; a first heat exchange pipe being arranged in the first heat exchange section; a second heat exchange pipe being arranged in the second heat exchange section, the first heat exchange pipe and the second heat exchange pipe both being used for circulating sCO2 medium; wherein a flue gas flow rate of the flue gas outlet end of the inlet flue and a flue gas flow rate of the flue gas outlet end of the injection flue can be independently adjusted.

Description

Technical Field

[0001] This disclosure relates to the field of ultracarbon power generation technology, and in particular to a heat exchange system for ultracarbon power generation using sintering waste heat. Background Technology

[0002] Supercritical carbon dioxide (sCO2) power generation technology is a thermal power generation technology based on the Brayton cycle principle, using sCO2 as the energy conversion medium. Sintering waste heat supercritical carbon power generation systems typically employ a cascade heat exchange method, connecting high-temperature and low-temperature heat exchangers in series, utilizing the waste heat from the flue gas output of the sintering ring cooler to heat the sCO2 medium. However, in practical applications, it has been found that the heat exchange efficiency of the aforementioned cascade heat exchange method is relatively low, limiting the improvement of the power generation efficiency of sintering waste heat supercritical carbon power generation systems. Utility Model Content

[0003] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, a heat exchange system for sintering waste heat ultracarbon power generation is proposed according to an embodiment of this disclosure, comprising: The inlet flue is used to receive the flue gas output from the sintering ring cooler. The heat exchange flue includes a first heat exchange section, a mixing section, and a second heat exchange section. The first heat exchange section is connected between the exhaust end of the inlet flue and the mixing section. The mixing section is used to transport flue gas to the sintering ring cooler through the second heat exchange section. The ejector flue has its inlet end connected to the inlet flue, and its inlet end is located between the inlet end and the exhaust end of the inlet flue. The exhaust end of the ejector flue is connected to the mixing section. The first heat exchange tube is installed in the first heat exchange section; The second heat exchange tube is installed in the second heat exchange section. Both the first heat exchange tube and the second heat exchange tube are used to flow CO2 medium. The flue gas flow rate at the exhaust end of the inlet flue and the flue gas flow rate at the exhaust end of the ejector flue can be adjusted independently.

[0005] In one feasible implementation, the heat exchange system for sintering waste heat ultracarbon power generation further includes: The first regulating valve is installed on the inlet flue and is used to regulate the flue gas flow rate at the exhaust end of the inlet flue. The second regulating valve is installed on the ejector flue and is used to regulate the flue gas flow rate at the exhaust end of the ejector flue. The first regulating valve and the second regulating valve can be controlled independently.

[0006] In one feasible implementation, both the first regulating valve and the second regulating valve are electric flow regulating valves.

[0007] In one feasible implementation, the heat exchange system for sintering waste heat ultracarbon power generation further includes: The first conveying pipe has its inlet end connected to the CO2 medium output from the regenerator, and its outlet end connected to the inlet end of the first heat exchanger. The second delivery pipe has an inlet end for receiving the sCO2 medium output from the compressor, and an outlet end for connecting to the inlet end of the second heat exchange pipe. The third delivery pipe is used to connect the outlet end of the first heat exchanger tube to the turbine system; The fourth delivery pipe is connected between the outlet end of the second heat exchanger pipe and the first delivery pipe.

[0008] In one feasible implementation, the heat exchange system for sintering waste heat ultracarbon power generation further includes: A temperature detection device is installed on the fourth delivery pipe to detect the temperature information of the CO2 medium inside the fourth delivery pipe.

[0009] In one feasible implementation, the heat exchange system for sintering waste heat ultracarbon power generation further includes: The second heat exchange section connects the inlet end of the outlet flue and the mixing section, and the exhaust end of the outlet flue is used to supply flue gas to the sintering ring cooler.

[0010] In one feasible implementation, the inner diameter of the ejector flue is smaller than the inner diameter of the inlet flue.

[0011] In one feasible implementation, the first heat exchange tube comprises a plurality of S-shaped tube segments connected in sequence.

[0012] In one feasible implementation, the second heat exchange tube comprises a plurality of S-shaped tube segments connected in sequence.

[0013] In one feasible implementation, both the first heat exchange tube and the second heat exchange tube are finned tubes.

[0014] The above description is merely an overview of the technical solution provided in this disclosure. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other features and effects of this disclosure more obvious and understandable, the following are specific examples of the implementation methods of this disclosure. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic structural diagram of a heat exchange system for ultracarbon power generation from sintering waste heat, according to one embodiment of the present disclosure.

[0016] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100. Inlet flue; 200. Heat exchange flue; 210. First heat exchange section; 220. Mixing section; 230. Second heat exchange section; 300. Ejector flue; 400a. First heat exchange tube; 400b. Second heat exchange tube; 500a. First regulating valve; 500b. Second regulating valve; 600a. First conveying pipe; 600b. Second conveying pipe; 600c. Third conveying pipe; 600d. Fourth conveying pipe; 700. Temperature detection device; 800. Outlet flue; 900. Control device. Detailed Implementation

[0017] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0018] It should be noted that supercritical carbon dioxide (SCCO2) power generation technology is a thermal power generation technology based on the Brayton cycle principle, using SCCO2 as the energy conversion working medium. Sintering waste heat supercritical carbon power generation systems typically employ a cascade heat exchange method, connecting high-temperature and low-temperature heat exchangers in series. The waste heat from the flue gas output from the sintering ring cooler is used to heat the SCCO2 medium. This cascade heat exchange means that the flue gas output from the sintering ring cooler flows sequentially through the heat exchange tubes of the high-temperature and low-temperature heat exchangers, with SCCO2 flowing within these tubes, allowing the SCCO2 medium to absorb heat from the flue gas.

[0019] However, in practical applications, it has been found that the heat exchange efficiency of the aforementioned cascade heat exchange is low, which limits the improvement of the power generation efficiency of the sintering waste heat ultracarbon power generation system.

[0020] In view of this, such as Figure 1As shown, a heat exchange system for sintering waste heat ultracarbon power generation is proposed according to a first aspect of the present disclosure, comprising: an inlet flue 100, the inlet end of which is used to receive flue gas output from a sintering ring cooler; a heat exchange flue 200, including a first heat exchange section 210, a mixing section 220, and a second heat exchange section 230, the first heat exchange section 210 being connected between the exhaust end of the inlet flue 100 and the mixing section 220, the mixing section 220 being used to supply flue gas to the sintering ring cooler through the second heat exchange section 230; and an ejector flue 300, the inlet end of which is connected to... The inlet flue 100 is connected to the inlet flue 100, and the inlet end of the ejector flue 300 is located between the inlet end of the inlet flue 100 and the exhaust end of the inlet flue 100. The exhaust end of the ejector flue 300 is connected to the mixing section 220. The first heat exchange tube 400a is disposed in the first heat exchange section 210. The second heat exchange tube 400b is disposed in the second heat exchange section 230. Both the first heat exchange tube 400a and the second heat exchange tube 400b are used to circulate sCO2 medium. The flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300 can be adjusted independently.

[0021] The heat exchange system for sintering waste heat ultracarbon power generation provided in this embodiment includes the aforementioned inlet flue 100, heat exchange flue 200, ejector flue 300, first heat exchange tube 400a, and second heat exchange tube 400b. The heat exchange flue 200 includes a first heat exchange section 210, a mixing section 220, and a second heat exchange section 230 connected in sequence. The mixing section 220 is connected between the first heat exchange section 210 and the second heat exchange section 230. The first heat exchange section 210 is connected between the mixing section 220 and the inlet flue 100. In practical applications, the inlet end of the inlet flue 100 can be connected to the flue gas output end of the sintering ring cooler, thereby allowing the intake of flue gas output from the sintering ring cooler. Correspondingly, the inlet flue 100 can guide at least a portion of the intake flue gas into the aforementioned heat exchange flue 200. The exhaust end of the second heat exchange section 230 can be connected to the flue gas input end of the sintering ring cooler, thereby allowing the flue gas flowing through the heat exchange flue 200 to pass through the heat exchange flue 200. The gas can be further returned to the sintering ring cooler for flue gas recycling. The first heat exchange tube 400a and the second heat exchange tube 400b are respectively arranged in the first heat exchange section 210 and the second heat exchange section 230. In practical applications, both the first heat exchange tube 400a and the second heat exchange tube 400b are used to flow sCO2 medium. Thus, the flue gas flowing in the heat exchange flue 200 can flow sequentially through the first heat exchange tube 400a in the first heat exchange section 210, the mixing section 220, and then through the second heat exchange tube 400b in the second heat exchange section 230, and exchange heat with the sCO2 medium in the first heat exchange tube 400a and the second heat exchange tube 400b, thereby achieving the heating of the sCO2 medium.The inlet and outlet ends of the ejector flue 300 are respectively connected to the mixing section 220 of the inlet flue 100 and the heat exchange flue 200. Along the extension direction of the inlet flue 100, the inlet end of the ejector flue 300 is located between the inlet end and the outlet end of the inlet flue 100. Therefore, the flue gas entering the inlet flue 100 can be divided into two paths when it reaches the inlet end of the ejector flue 300. The first path of flue gas can continue to flow along the inlet flue 100 to the first heat exchange section 210 of the heat exchange flue 200, and undergo heat exchange... The flue gas flows sequentially through the first heat exchange section 210, the mixing section 220, and the second heat exchange section 230 within the flue duct 200. The second flue gas can flow directly to the mixing section 220 through the ejector flue 300, where it mixes with the first flue gas before flowing into the second heat exchange section 230. Furthermore, the flue gas flow rates at the exhaust ends of the inlet flue duct 100 and the ejector flue 300 are independently adjustable. This is because the first flue gas has already reacted with the first heat exchange tube before flowing into the mixing section 220. The sCO2 medium in 400a exchanges heat, so the temperature of the first flue gas flowing into the mixing section 220 will be lower than the temperature of the second flue gas flowing into the mixing section 220. Based on this, the aforementioned heat exchange system can adjust the temperature of the mixed flue gas in the mixing section 220 by adjusting the flue gas flow rate at the exhaust end of the inlet flue 100 and the exhaust end of the ejector flue 300, thereby changing the temperature of the flue gas exchanging heat with the sCO2 medium in the second heat exchange tube 400b, and adjusting the temperature of the flue gas in the second heat exchange tube 400b. The heat absorbed by the sCO2 medium during the heat exchange process helps to prevent overheating or insufficient heat absorption of the sCO2 medium in the second heat exchange tube 400b, thereby improving the heat exchange efficiency of the aforementioned heat exchange system, enhancing the heating effect of the sCO2 medium, ensuring the power generation efficiency of the sintering waste heat ultracarbon power generation system, and improving the operational flexibility of the aforementioned heat exchange system, as well as its ability to distribute waste heat from the flue gas, thus improving the utilization efficiency of the waste heat from the flue gas.

[0022] It should be noted that the heat exchange system for sintering waste heat supercarbon power generation provided in this embodiment can be used as a subsystem of the sintering waste heat supercarbon power generation system in practical applications. For example, the outlet end of the first heat exchange tube 400a and the outlet end of the second heat exchange tube 400b can be connected to the turbine system of the sintering waste heat supercarbon power generation system. The turbine system can convert the thermal energy of the aforementioned sCO2 medium into mechanical energy, thereby using the aforementioned mechanical energy to drive the generator to generate electricity. The aforementioned inlet flue 100 and the aforementioned second heat exchange section 230 can be connected to the flue gas circulation loop of the aforementioned sintering ring cooler, thereby allowing the flue gas output from the sintering ring cooler to be connected and the heat-exchanged flue gas to be circulated back to the sintering ring cooler for the purpose of flue gas recycling.

[0023] It should be noted that in the cascade heat exchange method of the relevant technology, the low-temperature heat exchanger is located downstream of the high-temperature heat exchanger along the flue gas flow path. After the flue gas exchanges heat with the high-temperature heat exchanger, the temperature is sometimes low. As a result, the sCO2 medium in the heat exchange tube of the low-temperature heat exchanger often has insufficient heat absorption, resulting in a small temperature rise of the sCO2 medium after flowing through the low-temperature heat exchanger, which limits the heat exchange efficiency of the aforementioned cascade heat exchange. Compared to the aforementioned cascade heat exchange method, the heat exchange system provided in this embodiment can adjust the temperature of the mixed flue gas in the mixing section 220 by regulating the flue gas flow rate at the exhaust end of the inlet flue 100 and the exhaust end of the ejector flue 300. This changes the temperature of the flue gas exchanging heat with the sCO2 medium in the second heat exchange tube 400b. Furthermore, when the temperature of the sCO2 medium output from the second heat exchange tube 400b is detected to be low, the temperature of the mixed flue gas in the mixing section 220 can be increased by increasing the flue gas flow rate at the exhaust end of the ejector flue 300 and decreasing the flue gas flow rate at the exhaust end of the inlet flue 100. This enhances the temperature of the mixed flue gas in the mixing section 220. The heating effect of the sCO2 medium in the second heat exchange tube 400b when it flows through the second heat exchange tube 400b is improved, avoiding insufficient heat absorption of the sCO2 medium in the second heat exchange tube 400b during the heat exchange process, which is beneficial to improving the heat exchange efficiency of the aforementioned heat exchange system. Correspondingly, when the temperature of the sCO2 medium output from the second heat exchange tube 400b is detected to be high, the aforementioned heat exchange system can also reduce the flue gas temperature in the mixing section 220 by adjusting the flue gas flow rate at the exhaust end of the ejector flue 300 and increasing the flue gas flow rate at the exhaust end of the inlet flue 100, thereby avoiding overheating of the sCO2 medium in the second heat exchange tube 400b after the heat exchange process, which is beneficial to improving the utilization efficiency of flue gas waste heat.

[0024] It is understood that the inlet end of the first heat exchange tube 400a and the inlet end of the second heat exchange tube 400b can be used to connect to the sCO2 medium in practical applications. The source of the sCO2 medium corresponding to the first heat exchange tube 400a and the source of the sCO2 medium corresponding to the second heat exchange tube 400b can be the same or different, and no further restrictions are imposed here.

[0025] It is understood that the outlet end of the first heat exchange tube 400a and the outlet end of the second heat exchange tube 400b can be used to deliver sCO2 medium to the turbine system in practical applications. The turbine system corresponding to the first heat exchange tube 400a and the turbine system corresponding to the second heat exchange tube 400b can be the same or different, and no further restrictions are imposed here.

[0026] Understandably, in practical applications, the temperature information of the sCO2 medium output from the second heat exchange tube 400b can be detected, and the flue gas flow rate at the exhaust end of the inlet flue 100 and the exhaust end of the ejector flue 300 can be adjusted according to the aforementioned temperature information. This changes the temperature of the flue gas exchanging heat with the sCO2 medium in the second heat exchange tube 400b, and adjusts the heat absorbed by the sCO2 medium in the second heat exchange tube 400b during the heat exchange process. This helps to avoid overheating or insufficient heat absorption of the sCO2 medium in the second heat exchange tube 400b during the heat exchange process, thereby improving the heat exchange efficiency of the aforementioned heat exchange system.

[0027] For example, in practical applications, the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300 can be adjusted based on the comparison between the temperature information of the sCO2 medium output from the second heat exchange tube 400b and the preset temperature threshold. For instance, if the temperature information is less than the preset temperature threshold, the flue gas flow rate at the exhaust end of the inlet flue 100 can be reduced, and the flue gas flow rate at the exhaust end of the ejector flue 300 can be increased to raise the temperature of the mixed flue gas in the mixing section 220. This enhances the heating effect of the mixed flue gas in the mixing section 220 on the sCO2 medium in the second heat exchange tube 400b when it subsequently flows through the second heat exchange tube 400b. If the temperature information is greater than the preset temperature threshold, the flue gas flow rate at the exhaust end of the inlet flue 100 can be increased, and the flow rate at the ejector flue 300 can be reduced. The flue gas flow rate at the exhaust end of flue 300 is adjusted to reduce the flue gas temperature within the mixing section 220, thereby preventing overheating of the sCO2 medium in the second heat exchange tube 400b after the heat exchange process. When the temperature information equals a preset temperature threshold, the flue gas flow rates at the exhaust ends of the inlet flue 100 and the ejector flue 300 are controlled to maintain their current states, ensuring stable operation of the aforementioned heat exchange system and guaranteeing its heating effect on the sCO2 medium. This provides favorable conditions for the stable power generation of the sintering waste heat supercarbon power generation system. The aforementioned flow rate adjustment can be performed manually by operators based on the aforementioned temperature information, or a control device can be configured for the aforementioned heat exchange system, and the control device can automatically adjust the flow rate based on the comparison between the aforementioned temperature information and the aforementioned preset temperature threshold. It is understood that the aforementioned preset temperature threshold can be set according to actual needs, and no further restrictions are imposed here.

[0028] It is understood that the aforementioned inlet flue 100, heat exchange flue 200, ejector flue 300, first heat exchange tube 400a, and second heat exchange tube 400b can all be pipe fittings. For example, the inner diameter of the ejector flue 300 is smaller than the inner diameter of the inlet flue 100, which helps to increase the flue gas velocity output from the exhaust end of the ejector flue 300 and improves the uniformity of flue gas mixing within the mixing section 220.

[0029] It is understood that flow regulating valves can be installed on both the aforementioned inlet pipe and the aforementioned ejector pipe, and the flow regulating valves on the aforementioned inlet pipe and the aforementioned ejector pipe can operate independently, thereby allowing independent adjustment of the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300 through the aforementioned flow regulating valves.

[0030] like Figure 1 As shown, in some examples, the heat exchange system for sintering waste heat ultracarbon power generation further includes: a first regulating valve 500a, disposed on the inlet flue 100, the first regulating valve 500a being used to regulate the flue gas flow rate at the exhaust end of the inlet flue 100; and a second regulating valve 500b, disposed on the ejector flue 300, the second regulating valve 500b being used to regulate the flue gas flow rate at the exhaust end of the ejector flue 300; wherein the first regulating valve 500a and the second regulating valve 500b can be controlled independently.

[0031] In this technical solution, the aforementioned heat exchange system may further include the aforementioned first regulating valve 500a and the aforementioned second regulating valve 500b. Based on the aforementioned configuration, the aforementioned heat exchange system can adjust the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300 through the first regulating valve 500a and the second regulating valve 500b, respectively, thereby changing the temperature of the mixed flue gas in the aforementioned mixing section 220, and thus achieving the control of the heat exchange effect of the sCO2 medium in the second heat exchange tube 400b. This is beneficial to improving the heating efficiency of the aforementioned heat exchange system for the sCO2 medium and enhancing the utilization efficiency of the aforementioned heat exchange system for waste heat from the flue gas.

[0032] It is understood that the aforementioned first regulating valve 500a and the aforementioned second regulating valve 500b can both be flow regulating valves. Accordingly, the opening degree of the first regulating valve 500a and the second regulating valve 500b is adjustable, so that the flue gas flow rate at the exhaust end of the inlet flue 100 and / or the flue gas flow rate at the exhaust end of the ejector flue 300 can be changed accordingly by adjusting the aforementioned opening degree. For example, the aforementioned first regulating valve 500a and the aforementioned second regulating valve 500b can both be electric flow regulating valves, thereby improving the convenience of controlling the opening degree of the first regulating valve 500a and the second regulating valve 500b.

[0033] For example, the aforementioned inlet flue 100 may include a first pipe section and a second pipe section that are connected to each other. The inlet end of the aforementioned ejector flue 300 is arranged at the connection between the first pipe section and the second pipe section. The end of the aforementioned first pipe section away from the second pipe section is configured as the inlet end of the inlet flue 100, and the end of the aforementioned second pipe section away from the first pipe section is configured as the exhaust end of the inlet flue 100. The aforementioned first regulating valve 500a may be provided on the aforementioned second pipe section and used to regulate the flue gas flow rate in the second pipe section, thereby realizing the regulation of the flue gas flow rate at the exhaust end of the inlet flue 100. Alternatively, the aforementioned first regulating valve 500a may be provided at the exhaust end of the aforementioned inlet flue 100.

[0034] For example, the aforementioned second regulating valve 500b may be disposed in the ejector flue 300 and located between the smoke inlet end and the smoke outlet end of the ejector flue 300, or the aforementioned second regulating valve 500b may be disposed at the smoke outlet end of the ejector flue 300.

[0035] like Figure 1 As shown, in some examples, the heat exchange system for sintering waste heat ultracarbon power generation further includes: a first conveying pipe 600a, the inlet end of which is connected to the sCO2 medium output by the regenerator, and the outlet end of which is connected to the inlet end of the first heat exchange tube 400a; a second conveying pipe 600b, the inlet end of which is connected to the sCO2 medium output by the compressor, and the outlet end of which is connected to the inlet end of the second heat exchange tube 400b; a third conveying pipe 600c, which is connected between the outlet end of the first heat exchange tube 400a and the turbine system; and a fourth conveying pipe 600d, which is connected between the outlet end of the second heat exchange tube 400b and the first conveying pipe 600a.

[0036] In this technical solution, the aforementioned heat exchange system may further include the aforementioned first delivery pipe 600a, second delivery pipe 600b, third delivery pipe 600c, and fourth delivery pipe 600d. Based on the aforementioned configuration, the first heat exchange pipe 400a and the second heat exchange pipe 400b can be connected to the sCO2 medium via the first delivery pipe 600a and the second delivery pipe 600b, respectively. The first heat exchange pipe 400a can be connected to the sCO2 medium output from the regenerator, and the second heat exchange pipe 400b can be connected to the sCO2 medium output from the compressor, so that the aforementioned heat exchange system can heat sCO2 media from different sources. Furthermore, the first heat exchange pipe 400a can be connected to the turbine system via the third delivery pipe 600c to send the heated sCO2 medium into the turbine system for further processing. In the heat exchange process, the second heat exchange tube 400b can be connected to the first heat exchange tube 400a through the fourth conveying tube 600d and the first conveying tube 600a. Thus, after the sCO2 medium in the second heat exchange tube 400b has undergone the heating process in the second heat exchange section 230, it can also mix with the sCO2 medium in the first conveying tube 60a and enter the first heat exchange tube 400a. It can then be further heated by flue gas in the first heat exchange section 210, which helps to further improve the heating effect of the aforementioned heat exchange system on the sCO2 medium and improve the heat exchange efficiency of the aforementioned heat exchange system.

[0037] like Figure 1 As shown, in some examples, the heat exchange system for sintering waste heat supercarbon power generation also includes: a temperature detection device 700, which is installed on the fourth conveying pipe 600d, for detecting the temperature information of the sCO2 medium in the fourth conveying pipe 600d.

[0038] In this technical solution, the aforementioned heat exchange system may further include the aforementioned temperature detection device 700. Based on the aforementioned configuration, the aforementioned heat exchange system can use the temperature detection device 700 to obtain the temperature information of the sCO2 medium output by the second heat exchange tube 400b, thereby providing reference information for adjusting the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300, which is beneficial to improving the ease of use and controllability of the aforementioned flue gas system.

[0039] For example, the aforementioned temperature detection device 700 may include a temperature sensor.

[0040] like Figure 1 As shown, in some examples, the heat exchange system for sintering waste heat ultracarbon power generation also includes: an outlet flue 800, a second heat exchange section 230 connected between the inlet end of the outlet flue 800 and the mixing section 220, and the exhaust end of the outlet flue 800 for conveying flue gas to the sintering ring cooler.

[0041] In this technical solution, the aforementioned heat exchange system may further include the aforementioned outlet flue 800. Based on the aforementioned configuration, the second heat exchange section 230 can be connected to the flue gas inlet of the sintering ring cooler through the aforementioned outlet flue 800. This allows the flue gas to be stabilized after passing through the second heat exchange section 230 using the outlet flue 800, thereby improving the flow stability of the flue gas before it flows into the sintering ring cooler. This, in turn, helps to improve the operational stability of the aforementioned heat exchange system and the sintering ring cooler.

[0042] like Figure 1 As shown, in some feasible examples, the first heat exchange tube 400a may include multiple S-shaped tube segments connected in sequence. This allows for a reduction in the space occupied by the first heat exchange tube 400a while increasing its extension length, given the limited volume of the first heat exchange section 210. This, in turn, helps to increase the heat exchange area of ​​the first heat exchange tube 400a, improve its thermal conductivity, and further enhance the heat exchange efficiency of the aforementioned heat exchange system. Similarly, the second heat exchange tube 400b may include multiple S-shaped tube segments connected in sequence.

[0043] In some feasible examples, the first heat exchange tube 400a and the second heat exchange tube 400b can both be finned tubes, thereby increasing the heat exchange area of ​​the first heat exchange tube 400a and the second heat exchange tube 400b, increasing the thermal conductivity of the first heat exchange tube 400a and the second heat exchange tube 400b, and further improving the heat exchange efficiency of the aforementioned heat exchange system.

[0044] According to a second aspect of the present disclosure, a control method for a heat exchange system for sintering waste heat ultracarbon power generation is provided, for the heat exchange system as described in any of the first aspects above, the control method comprising: Step S101: Obtain the temperature information of the sCO2 medium output by the second heat exchange tube 400b.

[0045] Specifically, the aforementioned temperature information can reflect the heat absorption of the sCO2 medium in the second heat exchange tube 400b during the heat exchange process. In practical applications, the temperature detection device 700 can be used to detect the temperature of the sCO2 medium output by the second heat exchange tube 400b in order to obtain the aforementioned temperature information. The aforementioned temperature detection device 700 can be, but is not limited to, a temperature sensor or a thermometer.

[0046] Step S102: Adjust the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300 according to the temperature information.

[0047] Specifically, upon obtaining the aforementioned temperature information, the flue gas flow rates at the exhaust ends of the inlet flue 100 and the ejector flue 300 can be adjusted accordingly. This adjusts the temperature of the mixed flue gas within the mixing section 220, altering the flue gas temperature that exchanges heat with the sCO2 medium in the second heat exchange tube 400b. Adjusting the heat absorption of the sCO2 medium in the second heat exchange tube 400b during the heat exchange process helps prevent overheating or insufficient heat absorption by the sCO2 medium in the second heat exchange tube 400b. This, in turn, improves the heat exchange efficiency of the aforementioned heat exchange system, enhances the heating effect of the aforementioned heat exchange system on the sCO2 medium, provides a guarantee for the power generation efficiency of the sintering waste heat ultracarbon power generation system, and improves the operational flexibility of the aforementioned heat exchange system. It also enhances the aforementioned heat exchange system's ability to distribute waste heat from the flue gas, thus improving the utilization efficiency of the aforementioned heat exchange system for waste heat from the flue gas.

[0048] It is understood that, in the case of the aforementioned heat exchange system including the aforementioned first regulating valve 500a and second regulating valve 500b, the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300 can be adjusted by adjusting the opening degree of the first regulating valve 500a and the second regulating valve 500b.

[0049] In some examples, the aforementioned step S102 includes: If the temperature information is less than the preset temperature threshold, reduce the flue gas flow rate at the exhaust end of the inlet flue 100 and increase the flue gas flow rate at the exhaust end of the ejector flue 300. If the temperature exceeds the preset temperature threshold, increase the flue gas flow rate at the exhaust end of the inlet flue 100 and decrease the flue gas flow rate at the exhaust end of the ejector flue 300.

[0050] Specifically, when the aforementioned temperature information is less than a preset temperature threshold, it indicates that the sCO2 medium in the second heat exchange tube 400b absorbs less heat during the heat exchange process. This reduces the flue gas flow rate at the exhaust end of the inlet flue 100 and increases the flue gas flow rate at the exhaust end of the ejector flue 300, thereby increasing the temperature of the mixed flue gas in the mixing section 220. This enhances the heating effect of the mixed flue gas in the mixing section 220 on the sCO2 medium in the second heat exchange tube 400b when it subsequently flows through the tube, which is beneficial. To improve the heat exchange efficiency of the aforementioned heat exchange system; correspondingly, when the aforementioned temperature information is greater than the preset temperature threshold, it indicates that the sCO2 medium in the second heat exchange tube 400b has absorbed a large amount of heat during the heat exchange process, thereby increasing the flue gas flow rate at the exhaust end of the inlet flue 100 and reducing the flue gas flow rate at the exhaust end of the ejector flue 300, so as to reduce the flue gas temperature in the mixing section 220, thereby avoiding overheating of the sCO2 medium in the second heat exchange tube 400b after the heat exchange process, which is beneficial to improving the utilization efficiency of flue gas waste heat.

[0051] It is understandable that the aforementioned preset temperature threshold can be set according to actual needs, and no further restrictions will be imposed here.

[0052] In some examples, the aforementioned step S102 further includes: When the temperature information is equal to the preset temperature threshold, the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300 are controlled to maintain the current state.

[0053] Specifically, when the aforementioned temperature information is equal to the preset temperature threshold, it indicates that the heat absorption of the sCO2 medium in the second heat exchange tube 400b during the heat exchange process is relatively moderate. This allows the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300 to remain at their current state, thereby ensuring the stable operation of the aforementioned heat exchange system, guaranteeing the heating effect of the aforementioned heat exchange system on the sCO2 medium, and providing favorable conditions for the stable power generation of the sintering waste heat supercarbon power generation system.

[0054] According to a third aspect of the present disclosure, a computer-readable storage medium is provided, which stores a computer program that, when executed, implements the control method as described in any of the second aspects above.

[0055] Since the computer-readable storage medium provided in this disclosure is used to implement the control method as proposed in any of the second aspects above, it possesses all the beneficial effects of the control method, which will not be elaborated here.

[0056] A control device 900 is provided according to a fourth aspect of the present disclosure, comprising: a memory storing a computer program; and a processor for executing the computer program; wherein, when executing the computer program, the processor implements the control method as described in any of the second aspects above.

[0057] Since the control device 900 provided in this embodiment is used to implement the control method as proposed in any of the second aspects above, it possesses all the beneficial effects of the control method, which will not be elaborated here.

[0058] It is understood that in practical applications, the aforementioned control device 900 may be, but is not limited to, a PLC (Programmable Logic Controller) or a DCS (Distributed Control System). When the aforementioned heat exchange system includes the aforementioned first regulating valve 500a, second regulating valve 500b, and temperature detection device 700, the control device 900 may be signal-connected to the aforementioned first regulating valve 500a, second regulating valve 500b, and temperature detection device 700, so that the control device 900 can receive the aforementioned temperature information and control the opening degree of the first regulating valve 500a and second regulating valve 500b according to the aforementioned temperature information, thereby achieving the regulation of the flue gas flow rate at the exhaust end of the inlet flue 100 and the flue gas flow rate at the exhaust end of the ejector flue 300.

[0059] In some examples, the control device may also include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, and so on. The user interface may include a display screen, input units such as a keyboard, and optional user interfaces may include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a Wi-Fi interface), etc.

[0060] In an exemplary embodiment, the control device may further include an input / output interface and a display device, wherein the various functional units can communicate with each other via a bus. The memory stores a computer program, and a processor is used to execute the program stored in the memory, performing the methods described in the above embodiments.

[0061] The aforementioned storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the physical device described above, supporting the operation of information processing programs and other software and / or programs. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0062] Through the above description of the embodiments, those skilled in the art can clearly understand that this disclosure can be implemented by means of software plus necessary general-purpose hardware platform, or it can be implemented by hardware.

[0063] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0064] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0065] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A heat exchange system for ultracarbon power generation using waste heat from sintering, characterized in that, include: The inlet flue is used to connect the flue gas output from the sintering ring cooler. The heat exchange flue includes a first heat exchange section, a mixing section, and a second heat exchange section. The first heat exchange section is connected between the exhaust end of the inlet flue and the mixing section. The mixing section is used to deliver flue gas to the sintering ring cooler through the second heat exchange section. An ejector flue, wherein the inlet end of the ejector flue is connected to the inlet flue, and the inlet end of the ejector flue is located between the inlet end of the inlet flue and the exhaust end of the inlet flue, and the exhaust end of the ejector flue is connected to the mixing section; The first heat exchange tube is disposed within the first heat exchange section; The second heat exchange tube is disposed in the second heat exchange section. Both the first heat exchange tube and the second heat exchange tube are used to flow CO2 medium. The flue gas flow rate at the exhaust end of the inlet flue and the flue gas flow rate at the exhaust end of the ejector flue can be adjusted independently.

2. The heat exchange system for sintering waste heat ultracarbon power generation according to claim 1, characterized in that, Also includes: A first regulating valve is provided on the inlet flue, and the first regulating valve is used to regulate the flue gas flow rate at the exhaust end of the inlet flue; A second regulating valve is provided on the ejector flue, and the second regulating valve is used to regulate the flue gas flow rate at the exhaust end of the ejector flue; The first regulating valve and the second regulating valve can be controlled independently.

3. The heat exchange system for sintering waste heat ultracarbon power generation according to claim 2, characterized in that, Both the first regulating valve and the second regulating valve are electric flow regulating valves.

4. The heat exchange system for sintering waste heat ultracarbon power generation according to claim 1, characterized in that, Also includes: The first conveying pipe has an inlet end for connecting to the CO2 medium output by the regenerator, and an outlet end for connecting to the inlet end of the first heat exchange pipe. The second conveying pipe has an inlet end for receiving the sCO2 medium output from the compressor, and an outlet end connected to the inlet end of the second heat exchanger pipe. The third delivery pipe is used to connect the outlet end of the first heat exchanger tube and the turbine system; The fourth delivery pipe is connected between the outlet end of the second heat exchange pipe and the first delivery pipe.

5. The heat exchange system for sintering waste heat ultracarbon power generation according to claim 4, characterized in that, Also includes: A temperature detection device is installed on the fourth delivery pipe to detect the temperature information of the CO2 medium inside the fourth delivery pipe.

6. The heat exchange system for sintering waste heat ultracarbon power generation according to any one of claims 1 to 5, characterized in that, Also includes: The outlet flue, the second heat exchange section is connected between the inlet end of the outlet flue and the mixing section, and the exhaust end of the outlet flue is used to supply flue gas to the sintering ring cooler.

7. The heat exchange system for sintering waste heat ultracarbon power generation according to any one of claims 1 to 5, characterized in that, The inner diameter of the ejector flue is smaller than the inner diameter of the inlet flue.

8. The heat exchange system for sintering waste heat ultracarbon power generation according to any one of claims 1 to 5, characterized in that, The first heat exchange tube comprises multiple S-shaped tube segments connected in sequence.

9. The heat exchange system for sintering waste heat ultracarbon power generation according to any one of claims 1 to 5, characterized in that, The second heat exchange tube comprises multiple S-shaped tube segments connected in sequence.

10. The heat exchange system for sintering waste heat ultracarbon power generation according to any one of claims 1 to 5, characterized in that, Both the first heat exchange tube and the second heat exchange tube are finned tubes.

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