Solar heat collection and metallurgical coupling co-production system

Abstract

The utility model relates to the field of solar heat collection and metallurgical co-production, and provides a solar heat collection and metallurgical coupling co-production system which comprises a free piston Stirling ultra-high-temperature heat pump, a free piston Stirling ultra-high-temperature heat pump, a low-temperature heat exchanger and a high-temperature heat exchanger. The power piston can reciprocate to transfer heat from the low-temperature heat exchanger to the high-temperature heat exchanger; the solar heat collection system is thermally coupled to the low-temperature heat exchanger so as to transfer heat to the low-temperature heat exchanger; and the metallurgical system is thermally coupled to the high-temperature heat exchanger so as to absorb heat from the high-temperature heat exchanger. The whole system is driven by solar energy, carbon emission is greatly reduced, and efficient coupling of the solar heat collection technology and the metallurgy technology can be achieved by introducing the free piston Stirling ultra-high-temperature heat pump.

Description

Technical Field

[0001] The utility model relates to the field of solar energy heat collection and metallurgical co-production, in particular to a solar energy heat collection and metallurgical coupling co-production system. Background Art

[0002] As an important basic raw material industry, the steel industry is a resource-intensive industry with large energy and mineral resource consumption. It is the manufacturing industry with the largest carbon emissions in China. Therefore, it is urgent to accelerate the energy conservation and emission reduction in the steel industry. In traditional metallurgical processes, blast furnace ironmaking is the main process for producing pig iron. The main process is that ore (mainly Fe2O3, Fe3O4), fuel, and flux are loaded into the furnace from the top of the furnace. The cold air from the blower passes through the hot blast furnace to form hot air that is blown into the blast furnace tuyere. As the coke burns, the hot coal gas flows from bottom to top, while the charge moves from top to bottom, contacts each other, exchanges heat, and is gradually reduced. Finally, it reaches the bottom of the furnace and is reduced to pig iron. In the current process, coke and coal powder are mostly used as reducing agents, so a large amount of carbon dioxide and other pollutants are generated during the production process, causing pollution.

[0003] The hydrogen metallurgical process replaces the reducing agent in blast furnace ironmaking with cleaner hydrogen, because the reaction between hydrogen and iron ore during the reduction process only produces water and pig iron, greatly reducing carbon emissions. However, the current hydrogen metallurgical process often uses methods such as burning rich hydrogen to heat hydrogen and iron ore, and creates a high-temperature environment of 600℃ to 800℃ to achieve the normal ironmaking reduction reaction. This method requires the use of excess hydrogen, but the cost of hydrogen manufacturing is expensive, so the overall benefit of this method is low. Solar thermal collection technology is relatively mature, but due to the limitations of the structure itself, its collection temperature is difficult to exceed 400~500℃, so it is difficult to use solar thermal collection technology to directly provide continuous heating for the hydrogen metallurgical system. Utility Model Content

[0004] The utility model provides a solar thermal collection and metallurgical coupling co-production system to solve the defects of the metallurgical system in the prior art, such as large carbon emissions, high energy loss and low system performance, and realizes the coupling of solar thermal collection and metallurgical process, and absorbs the solar thermal heat and heats it up to continuously supply heat to the metallurgical system.

[0005] The utility model provides a solar heat collection and metallurgical coupling co-production system, comprising:

[0006] A free piston Stirling ultra-high temperature heat pump, comprising a power piston, a low temperature heat exchanger and a high temperature heat exchanger, wherein the power piston is capable of reciprocating to transfer heat from the low temperature heat exchanger to the high temperature heat exchanger;

[0007] a solar thermal collection system, thermally coupled to the low-temperature heat exchanger to transfer heat to the low-temperature heat exchanger;

[0008] A metallurgical system is thermally coupled to the high temperature heat exchanger to absorb heat from the high temperature heat exchanger.

[0009] According to the solar thermal collection and metallurgical coupling cogeneration system provided by the utility model, the solar thermal collection system includes a solar thermal collection device and a first pumping device.

[0010] Wherein, the solar energy heat collection device, the low-temperature heat exchanger and the first pumping equipment are connected in sequence to form a solar energy heat exchange circulation loop.

[0011] According to the solar thermal collection and metallurgical coupling cogeneration system provided by the utility model, the metallurgical system includes a second pumping device and a metallurgical reactor.

[0012] Wherein, the second pumping equipment, the high-temperature heat exchanger and the metallurgical reaction furnace are connected in sequence to form a metallurgical heat exchange circulation loop.

[0013] According to the solar energy heat collection and metallurgical coupling cogeneration system provided by the utility model, the metallurgical reactor is provided with an iron ore inlet and a hydrogen inlet, and the second pumping equipment, the high-temperature heat exchanger and the heat exchanger in the metallurgical reactor are sequentially connected to form the metallurgical heat exchange circulation loop.

[0014] The heat exchanger exchanges heat with the iron ore introduced into the metallurgical reaction furnace through the iron ore inlet and the hydrogen introduced into the metallurgical reaction furnace through the hydrogen inlet to provide heat for the iron-making reduction reaction.

[0015] According to the solar energy heat collection and metallurgical coupling cogeneration system provided by the utility model, the metallurgical reactor is also provided with a high-temperature pig iron outlet, and the solar energy heat collection and metallurgical coupling cogeneration system further includes a first heat regenerator,

[0016] Wherein, the high-temperature pig iron outlet is connected to the first heat regenerator, and the first heat regenerator is connected to the iron ore inlet, so that the iron ore can exchange heat with the high-temperature pig iron discharged from the high-temperature pig iron outlet in the first heat regenerator before entering the metallurgical reactor from the iron ore inlet.

[0017] According to the solar energy heat collection and metallurgical coupling cogeneration system provided by the utility model, the metallurgical reactor is also provided with a high-temperature steam outlet, and the solar energy heat collection and metallurgical coupling cogeneration system also includes a second heat regenerator.

[0018] The high-temperature steam outlet is connected to the second reheater, and the second reheater is connected to the hydrogen inlet, so that the hydrogen can exchange heat with the high-temperature steam discharged from the high-temperature steam outlet in the second reheater before entering the metallurgical reactor from the hydrogen inlet.

[0019] According to the solar thermal collection and metallurgical coupling cogeneration system provided by the utility model, the heat carrier medium in the solar thermal collection system is molten salt, and / or the heat carrier medium in the metallurgical system is hydrogen.

[0020] According to the solar energy heat collection and metallurgical coupling cogeneration system provided by the utility model, the free piston Stirling ultra-high temperature heat pump comprises a compressor unit and a heat pump unit connected to each other, a compression chamber is formed between the compressor unit and the heat pump unit, and the compression chamber is configured to be an extended compression chamber.

[0021] The compressor unit comprises:

[0022] The power piston is capable of reciprocating to perform work on the gas in the compression chamber;

[0023] The dome cylinder is arranged on a side of the power piston facing the compression chamber.

[0024] According to the solar thermal collection and metallurgical coupling cogeneration system provided by the utility model, the compressor unit also includes:

[0025] The radiation protection screen is arranged in the dome tube.

[0026] According to the solar heat collection and metallurgical coupling cogeneration system provided by the utility model, the heat pump unit includes:

[0027] The low-temperature heat exchanger, the regenerator and the high-temperature heat exchanger are sequentially arranged in a direction away from the compression chamber and close to the compression chamber;

[0028] The displacer is arranged in the accommodation space surrounded by the low-temperature heat exchanger, the regenerator and the high-temperature heat exchanger. The compression chamber is formed between one end of the displacer and the power piston, and the other end of the displacer forms an expansion chamber.

[0029] The utility model also provides a solar energy heat collection and metallurgical coupling co-production method, comprising:

[0030] The solar thermal collection system is used to transfer the heated heat carrier medium to the low temperature heat exchanger of the free piston Stirling ultra-high temperature heat pump;

[0031] electrically driving a power piston of the free piston Stirling ultra-high temperature heat pump to reciprocate to transfer heat from the low temperature heat exchanger to the high temperature heat exchanger;

[0032] The heat carrier medium of the metallurgical system is used to absorb heat from the high-temperature heat exchanger to perform pig iron smelting.

[0033] According to the solar energy heat collection and metallurgical coupling cogeneration method provided by the utility model, the solar energy heat collection system is used to transfer the heated heat carrier medium to the low temperature heat exchanger of the free piston Stirling ultra-high temperature heat pump, including:

[0034] Using a solar thermal collector to collect solar heat to heat the heat-carrying medium;

[0035] The heated heat carrier medium is transferred to the low-temperature heat exchanger by a first pumping device.

[0036] According to the solar energy heat collection and metallurgical coupling co-production method provided by the utility model, the heat carrier medium of the metallurgical system is used to absorb heat from the high-temperature heat exchanger to perform pig iron smelting, including:

[0037] transferring the heat-carrying medium that absorbs heat from the high-temperature heat exchanger to the metallurgical reaction furnace by a second pumping device;

[0038] Iron ore and hydrogen are fed into the metallurgical reaction furnace, and pig iron smelting is performed by utilizing the heat of the heat-carrying medium fed into the metallurgical reaction furnace.

[0039] The solar thermal collection and metallurgical coupling cogeneration system provided by the utility model first collects heat by the solar thermal collection system, and uses the low-temperature heat exchanger of the free piston Stirling ultra-high temperature heat pump to absorb the solar thermal heat. At the same time, the power piston of the free piston Stirling ultra-high temperature heat pump continues to reciprocate, transferring heat to the high-temperature heat exchanger, and the metallurgical system further absorbs heat from the high-temperature heat exchanger to increase the temperature to heat the heat-carrying medium and provide heat for the metallurgical process, forming a complete clean metallurgical process and system. Therefore, in the utility model, the entire system is driven by solar energy, which greatly reduces carbon emissions, and by introducing the free piston Stirling ultra-high temperature heat pump, efficient coupling of solar thermal collection technology and metallurgical technology can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present invention or the prior art, 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a structural schematic diagram of a free piston Stirling ultra-high temperature heat pump in a solar heat collection and metallurgical coupling cogeneration system provided by the utility model;

[0042] Figure 2 This is one of the structural schematic diagrams of the solar heat collection and metallurgical coupling co-production system provided by the utility model;

[0043] Figure 3 This is the second structural schematic diagram of the solar energy heat collection and metallurgical coupling co-production system provided by the utility model;

[0044] Figure 4 This is a flow chart of the solar energy heat collection and metallurgical coupling co-production method provided by the utility model;

[0045] Reference numerals:

[0046] 100: Solar thermal collection and metallurgical coupling cogeneration system;

[0047] 200: solar thermal collection system; 202: solar thermal collection device; 204: first pumping equipment;

[0048] 300: free piston Stirling ultra-high temperature heat pump; 302: power piston; 304: low temperature heat exchanger; 306: high temperature heat exchanger; 308: compressor unit; 310: heat pump unit; 312: compression chamber; 314: dome cylinder; 316: radiation shield; 318: linear oscillation motor; 320: main body; 322: plug-in part; 324: first plane supporting elastic member; 326: shell; 328: back cavity; 330: ejector; 332: regenerator; 334: expansion chamber; 336: base; 338:

[0049] The second plane supports the elastic member; 340: a raised portion;

[0050] 400: Metallurgical system; 402: Second pumping equipment; 404: Metallurgical reactor; 406: Iron ore inlet; 408: Hydrogen inlet; 410: Heat exchanger; 412: High-temperature pig iron outlet; 414:

[0051] High temperature steam outlet;

[0052] 500: first regenerator; 600: second regenerator;

[0053] 700: Solar thermal collection and metallurgical coupling co-production method; 702-706: various steps. DETAILED DESCRIPTION

[0054] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0055] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0056] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0057] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] See now Figures 1 to 4The embodiments of the present invention are described. It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute any special limitation to the present invention.

[0060] First, Figures 1 to 3 As shown, an embodiment of the utility model provides a solar thermal collection and metallurgical coupling cogeneration system 100, which generally includes a solar thermal collection system 200, a free piston Stirling ultra-high temperature heat pump 300 and a metallurgical system 400.

[0061] Specifically, first refer to Figure 1 , shows a schematic diagram of the structure of a free piston Stirling ultra-high temperature heat pump 300 used in an embodiment of the utility model. The free piston Stirling ultra-high temperature heat pump 300 includes a compressor unit 308 and a heat pump unit 310 connected to each other, and a compression chamber 312 is formed between the compressor unit 308 and the heat pump unit 310. The compression chamber 312 is configured to be a lengthened compression chamber, that is, the cavity of the compression chamber 312 is further increased on the basis of the length of the compression chamber of a traditional heat pump, and its specific value needs to be determined according to actual design requirements, thereby increasing the distance between the high temperature area of ​​the heat pump and the compressor motor side, and also increasing the space of the compression chamber 312, which is more convenient for adding a dome cylinder 314. The compressor unit 308 includes a power piston 302 and a dome cylinder 314, and the power piston 302 can reciprocate to do work on the gas in the compression chamber 312, thereby transmitting sound work and pressure fluctuations into the compression chamber 312. The dome cylinder 314 is disposed on the side of the power piston 302 facing the compression chamber 312, and can be fixedly installed on the power piston 302 by welding, threaded connection, etc., so as to avoid direct contact between the power piston 302 and the gas in the compression chamber 312 and reduce heat exchange.

[0062] In this arrangement, by increasing the cavity of the compression chamber 312, the space of the compression chamber 312 is increased, the distance between the high temperature area of ​​the heat pump unit 310 and the motor side of the compressor unit 308 is increased, the heat conduction resistance between the heat pump unit 310 and the compressor unit 308 is increased, and it is also convenient to install the dome cylinder 314. At the same time, adding the dome cylinder 314 to the power piston 302 can further effectively reduce the conduction of the gas heat in the compression chamber 312 to the compressor motor side, effectively reduce the working environment temperature of the compressor motor side, extend the service life of the heat pump structure when pumping heat at ultra-high temperature, and finally significantly improve the performance and reliability of the free piston Stirling heat pump working in the ultra-high temperature zone.

[0063] In the embodiment of the present invention, the compressor unit 308 further includes a radiation shield 316, which is disposed in the dome tube 314. By adding the radiation shield 316, the heat conduction and radiation from the high temperature area of ​​the heat pump and the gas in the compression chamber 312 to the compressor motor side can be effectively reduced.

[0064] In a specific embodiment of the present invention, the radiation shield 316 can be set as a multi-stage radiation shield. It is understandable that multiple layers of radiation shields can be arranged in sequence in the dome tube 314, so that heat conduction and heat radiation can be reduced step by step, effectively reducing the working environment temperature of the compressor motor side.

[0065] like Figure 1 As shown, the extension direction of the power piston 302 and the heat pump unit 310 is located on the same straight line. With such an arrangement, a single compressor type ultra-high temperature free piston Stirling heat pump structure is formed, which has a more compact structure, and by lengthening the compression chamber 312, the distance between the high temperature area of ​​the heat pump and the compressor motor is increased. At the same time, adding a dome cylinder 314 to the compressor power piston 302 greatly reduces the transfer of heat to the motor side, which is conducive to the compressor working in a more suitable temperature range, thereby improving the system efficiency.

[0066] In a specific embodiment of the present invention, the compressor unit 308 further includes a linear oscillation motor 318, and the linear oscillation motor 318 includes a mover part and a stator part. Figure 1 As shown, the power piston 302 includes a main body 320 and a plug-in part 322 connected to form a fork-shaped structure. The dome cylinder 314 is fixedly arranged on the main body 320, and the plug-in part 322 can be made of a high-temperature resistant permanent magnet material and inserted into the copper coil of the linear oscillation motor 318. Thus, the copper coil with alternating current generates a constantly changing magnetic field, and the electromagnetic force drives the power piston 302 to achieve reciprocating motion, thereby transmitting acoustic power and pressure fluctuations to the compression chamber 312.

[0067] As an optional embodiment of the present invention, the compressor unit 308 further includes a first plane support elastic member 324, and the first plane support elastic member 324 is arranged on the side of the power piston 302 away from the compression chamber 312. Specifically, the first plane support elastic member 324 can be a leaf spring. Generally, the free piston ultra-high temperature Stirling heat pump 300 further includes a housing 326, and a back cavity 328 is formed between the side of the power piston 302 away from the compression chamber 312 and the inner wall of the housing 326. The leaf spring is installed in the back cavity 328 to provide a supporting elastic force for the reciprocating motion of the power piston 302.

[0068] In an optional embodiment of the present invention, the heat pump unit 310 includes an ejector 330, a low-temperature heat exchanger 304, a regenerator 332, and a high-temperature heat exchanger 306. Specifically, Figure 1 As shown, the low-temperature heat exchanger 304, the regenerator 332 and the high-temperature heat exchanger 306 are sequentially arranged on the inner wall of the shell 326, and the ejector 330 is arranged in the accommodation space surrounded by the low-temperature heat exchanger 304, the regenerator 332 and the high-temperature heat exchanger 306. A compression chamber 312 is formed between one end of the ejector 330 and the power piston 302, and an expansion chamber 334 is formed between the other end of the ejector 330 and the inner wall of the shell 326. In this way, the acoustic work transmitted by the power piston 302 passes through the ejector 330, the low-temperature heat exchanger 304, the regenerator 332 and the high-temperature heat exchanger 306 in sequence, is used in the regenerator 332 and produces a pump heat effect, and finally the heat is transferred from the low-temperature heat exchanger 304 to the high-temperature heat exchanger 306 and output to an external device.

[0069] Furthermore, in the embodiment of the present utility model, the heat pump unit 310 further includes a base 336 and a second planar supporting elastic member 338. Specifically, as Figure 1 As shown, the base 336 is fixedly disposed in the accommodating space, for example, it can be fixedly connected to the inner wall of the housing 326 to support the ejector 330. The second plane supporting elastic member 338 can be a leaf spring, one end of which is connected to the base 336 and the other end is connected to the ejector 330. Figure 1 As shown, the base 336 is provided with a protrusion 340 , and a leaf spring is sleeved on the protrusion 340 . One end of the leaf spring is connected to the protrusion 340 , and the other end is connected to the ejector 330 , thereby providing supporting elastic force for the reciprocating motion of the ejector 330 .

[0070] Continue to see Figure 1 In the embodiment of the present invention, the compressor unit 308 includes a group of power pistons 302, a linear oscillation motor 318 and a leaf spring, and the extension direction of the power piston 302 and the heat pump unit 310 is located on the same straight line. Figure 1 As shown, the housing 326 is designed as a vertical long cylindrical structure, the heat pump unit 310 is arranged on the upper part of the inner wall of the housing 326, and the compressor unit 308 is arranged on the lower part of the inner wall of the housing 326. Figure 1 For the placement of the free piston Stirling ultra-high temperature heat pump shown in the figure, the up and down directions in the figure refer to the up and down positions and vertical directions.

[0071] In this way, a single-compressor ultra-high temperature free piston Stirling heat pump structure is constructed. The structure is more compact, and by lengthening the compression chamber 312, the distance between the high-temperature heat exchanger 306 and the compressor motor is increased. At the same time, by adding a dome cylinder 314 to the compressor power piston 302, the transfer of heat from the high-temperature area to the motor side is greatly reduced, which is conducive to the compressor working in a more suitable temperature range, thereby effectively improving the system efficiency.

[0072] Furthermore, if Figure 2 and Figure 3 As shown, in the solar thermal collection and metallurgical coupling cogeneration system 100 of the present invention, the free piston Stirling ultra-high temperature heat pump 300 as described above is used in conjunction with the solar thermal collection system 200 and the metallurgical system 400, thereby realizing efficient coupling of solar thermal collection technology and metallurgical technology.

[0073] Specifically, in the embodiment of the present invention, the power piston 302 of the free piston Stirling ultra-high temperature heat pump 300 can reciprocate during actual operation, thereby transferring heat from the low temperature heat exchanger 304 to the high temperature heat exchanger 306. For the solar thermal collection system 200, it can be thermally coupled to the low temperature heat exchanger 304 of the free piston Stirling ultra-high temperature heat pump 300, thereby transferring heat to the low temperature heat exchanger 304; and for the metallurgical system 400, it can be thermally coupled to the high temperature heat exchanger 306 of the free piston Stirling ultra-high temperature heat pump 300, thereby absorbing heat from the high temperature heat exchanger 306.

[0074] In other words, in the solar thermal collection and metallurgical coupling cogeneration system 100 provided in the embodiment of the utility model, the solar thermal collection system 200 first collects heat, and uses the low-temperature heat exchanger 304 of the free piston Stirling ultra-high temperature heat pump 300 to absorb the solar thermal heat. At the same time, the power piston 302 of the free piston Stirling ultra-high temperature heat pump 300 continues to reciprocate, transferring heat from the low-temperature heat exchanger 304 to the high-temperature heat exchanger 306. Then, the metallurgical system 400 further absorbs heat from the high-temperature heat exchanger 306 to increase the temperature to heat the heat carrier and provide heat for the metallurgical process, forming a complete clean metallurgical process and system.

[0075] Therefore, in the present invention, the entire system is driven by solar energy, which greatly reduces carbon emissions, and by introducing a free piston Stirling ultra-high temperature heat pump, efficient coupling of solar thermal collection technology and metallurgical technology can be achieved.

[0076] In an optional embodiment, the heat carrier used in the solar thermal collection system 200 may be molten salt. In another optional embodiment, the heat carrier used in the metallurgical system 400 may be hydrogen. The structure and specific application process of the utility model will be described below using molten salt and hydrogen as examples. However, it should be understood that the heat carrier used in the solar thermal collection system 200 and the heat carrier used in the metallurgical system 400 can be selected according to actual conditions, and the utility model is not limited to a certain or certain specific embodiments. It should also be emphasized that the molten salt and hydrogen involved in the system are only used as heat carriers and do not participate in the reaction.

[0077] See also Figure 2 and Figure 3In one embodiment of the utility model, for the solar thermal collection system 200, it may include a solar thermal collection device 202 and a first pumping device 204. In actual application, the solar thermal collection device 202, the low-temperature heat exchanger 304 and the first pumping device 204 may be connected in sequence to form a solar heat exchange circulation loop. Correspondingly, for the metallurgical system 400, it may include a second pumping device 402 and a metallurgical reactor 404. In actual application, the second pumping device 402, the high-temperature heat exchanger 306 and the metallurgical reactor 404 may be connected in sequence to form a metallurgical heat exchange circulation loop. Thus, the solar heat exchange circulation loop formed by the solar heat collection device 202, the low-temperature heat exchanger 304 and the first pumping equipment 204 in the solar heat collection system 200, together with the metallurgical heat exchange circulation loop formed by the second pumping equipment 402, the high-temperature heat exchanger 306 and the metallurgical reactor 404 in the metallurgical system 400, are linked together with the free piston Stirling ultra-high temperature heat pump 300, so that the entire system can be driven by solar energy, greatly reducing carbon emissions, and by introducing the free piston Stirling ultra-high temperature heat pump, efficient coupling of solar heat collection technology and metallurgical technology can be achieved.

[0078] See now Figure 2 In one of the optional embodiments of the present invention, for the metallurgical system 400, an iron ore inlet 406 and a hydrogen inlet 408 may be provided on the metallurgical reactor 404. Specifically, in actual application, the second pumping device 402, the high-temperature heat exchanger 306 and the heat exchanger 410 in the metallurgical reactor 404 may be connected in sequence to form a metallurgical heat exchange circulation loop as described above. Correspondingly, the heat exchanger 410 in the metallurgical reactor 404 may perform heat exchange with the iron ore introduced into the metallurgical reactor 404 through the iron ore inlet 406 and the hydrogen introduced into the metallurgical reactor 404 through the hydrogen inlet 408, so as to utilize the heat exchanger 410 to provide sufficient heat for the ironmaking reduction reaction, thereby achieving full utilization of the heat.

[0079] Furthermore, in order to make fuller use of the heat, in another embodiment of the present invention, Figure 3 As shown, the metallurgical reactor 404 may also be provided with a high-temperature pig iron outlet 412, and the solar thermal collection and metallurgical coupling cogeneration system 100 may also include a first regenerator 500. Specifically, the high-temperature pig iron outlet 412 may be connected to the first regenerator 500, and the first regenerator 500 may also be connected to the iron ore inlet 406 as described above. With this arrangement, the iron ore may be heat-exchanged with the high-temperature pig iron discharged from the high-temperature pig iron outlet 412 in the first regenerator 500 before entering the metallurgical reactor 404 from the iron ore inlet 406, thereby preheating the iron ore to be reacted.

[0080] Similarly, in one embodiment of the present invention, Figure 3 As shown, the metallurgical reactor 404 may be further provided with a high-temperature steam outlet 414, and the solar thermal collection and metallurgical coupling cogeneration system 100 may further include a second regenerator 600. Specifically, the high-temperature steam outlet 414 may be connected to the second regenerator 600, and the second regenerator 600 may also be connected to the hydrogen inlet 408 as described above. Through this arrangement, the hydrogen may be heat-exchanged with the high-temperature steam discharged from the high-temperature steam outlet 414 in the second regenerator 600 before entering the metallurgical reactor 404 from the hydrogen inlet 408, thereby preheating the hydrogen to be reacted.

[0081] In addition, based on the above-mentioned embodiments, another embodiment of the present invention further provides a solar thermal collection and metallurgical coupling co-production method 700, such as Figure 4 The solar thermal collection and metallurgical coupling co-production method 700 may generally include the following steps:

[0082] First, in step 702, the solar thermal collection system 200 is used to transfer the heated heat carrier medium to the low temperature heat exchanger 304 of the free piston Stirling ultra-high temperature heat pump 300;

[0083] Then, in step 704, the power piston 302 of the free piston Stirling ultra-high temperature heat pump 300 is electrically driven to reciprocate, thereby transferring heat from the low temperature heat exchanger 304 to the high temperature heat exchanger 306;

[0084] Next, in step 706, the heat carrier medium of the metallurgical system 400 may be used to absorb heat from the high-temperature heat exchanger 306 to perform pig iron smelting.

[0085] Furthermore, in the embodiment of the present utility model, the step of transferring the heated heat medium to the low temperature heat exchanger 304 of the free piston Stirling ultra-high temperature heat pump 300 by using the solar thermal collection system 200 may specifically include:

[0086] First, the solar energy heat is collected by the solar energy heat collection device 202 to heat the heat carrier medium;

[0087] Secondly, the heated heat carrier medium is transferred to the low-temperature heat exchanger 304 through the first pumping device 204 .

[0088] Furthermore, the step of utilizing the heat carrier medium of the metallurgical system 400 to absorb heat from the high temperature heat exchanger 306 to perform pig iron smelting may specifically include:

[0089] First, the heat medium absorbing heat from the high temperature heat exchanger 306 is transferred to the metallurgical reaction furnace 404 through the second pumping device 402;

[0090] Then, iron ore and hydrogen are fed into the metallurgical reaction furnace 404, and pig iron smelting is performed using the heat of the heat carrier medium fed into the metallurgical reaction furnace 404.

[0091] The following combination Figures 1 to 4 It should be understood that the following is only an illustrative embodiment of the present invention and does not constitute any special limitation to the present invention.

[0092] First of all, according to the embodiments of the present invention, the solar thermal collection and metallurgical coupling cogeneration system 100 provided by the present invention can generally include three sub-parts, namely, a solar thermal collection system 200, an ultra-high temperature heat pump system (i.e., a free piston Stirling ultra-high temperature heat pump 300) and a metallurgical system 400.

[0093] Specifically, the solar thermal system 200 absorbs solar energy through the solar thermal collector 202, heats the molten salt or other heat carrier to about 430°C, and provides heat energy for the free piston Stirling ultra-high temperature heat pump 300. The free piston Stirling ultra-high temperature heat pump 300 is a coupling device for the solar thermal system 200 and the metallurgical system 400, and is the core component of the entire co-production system. It uses its own pump heat function to absorb heat from the solar thermal collector 202, and then continuously provides heat energy for the metallurgical system 400. The metallurgical system 400 is the heat consumption end of the entire system, and the key device involved is the metallurgical reactor 404, which smelts pig iron by introducing iron ore and hydrogen into the furnace for reduction reaction. The reaction is an endothermic reaction, and pig iron is produced by absorbing heat from the free piston Stirling ultra-high temperature heat pump 300.

[0094] for Figure 2As for the cogeneration process shown, first, the high-temperature molten salt at about 430°C after being heated by the solar thermal collector 202 is passed into the low-temperature heat exchanger 304 of the free piston Stirling ultra-high temperature heat pump 300 through the solar heat exchange circulation loop, and as the heat source at the low temperature end of the heat pump, heat is transferred to the free piston Stirling ultra-high temperature heat pump 300 and the temperature is reduced to about 420°C. Then, the free piston Stirling ultra-high temperature heat pump 300 absorbs the heat of the high-temperature molten salt in the low-temperature heat exchanger 304, and uses its own pumping heat function to further increase the temperature and heat the hydrogen flowing through the high-temperature heat exchanger 306 through the metallurgical heat exchange circulation loop. The low-temperature molten salt after absorbing heat in the low-temperature heat exchanger 304 flows into the first pumping device 204, and then flows back to the solar thermal collector 202 through the pipeline for the next heating. The hydrogen pumped out from the second pumping device 402 has a lower temperature and is passed into the high-temperature heat exchanger 306 through the metallurgical heat exchange circulation loop to be heated to about 640°C. The high-temperature hydrogen heated by the high-temperature heat exchanger 306 is introduced into the metallurgical reactor 404, and exchanges heat with the metallurgical reactor 404 through the heat exchanger 410, continuously providing heat for the raw materials of the ironmaking reduction reaction. The low-temperature hydrogen after completing the heat exchange with the metallurgical reactor 404 is introduced into the second pumping equipment 402 for heating again. In this way, a complete solar energy-heat pump-hydrogen metallurgical coupling cogeneration system is formed.

[0095] Furthermore, for Figure 3 For the embodiment shown in FIG. 1 , the implementation idea of ​​this embodiment is similar to Figure 2 The embodiment shown is similar to Figure 2 A further extension of the embodiment shown. The difference is that Figure 3 The embodiment shown adds a first regenerator 500 and a second regenerator 600 after the metallurgical reactor 404, the purpose of which is to use the produced high-temperature pig iron and high-temperature steam to preheat the iron ore and hydrogen, and then introduce the preheated iron ore and hydrogen into the metallurgical reactor 404 to further improve the system efficiency. Since the reaction temperature of the metallurgical reactor 404 is about 600-800°C, the reaction products pig iron and steam are both about 600-800°C, and the waste heat is very large. Therefore, the high-temperature pig iron and high-temperature steam produced by the metallurgical reactor 404 are respectively introduced into the first regenerator 500 and the second regenerator 600 to preheat the raw materials iron ore and hydrogen required for metallurgy, respectively, and the pig iron and steam after absorbing heat can be collected later, thereby improving the system efficiency and making more adequate use of the waste heat. It should be emphasized here that the first regenerator 500 and the second regenerator 600 can be any suitable form of heat exchanger, which can be determined according to the specific situation, and the utility model is not limited to this.

[0096] In summary, in the solar thermal collection and metallurgical coupling cogeneration system 100 and the solar thermal collection and metallurgical coupling cogeneration method 700 provided by the present invention, by adding a free piston Stirling ultra-high temperature heat pump 300 between the solar thermal collection system 200 and the metallurgical system 400, efficient temperature increase and heat pumping between the solar thermal collection system 200 and the metallurgical system 400 is achieved. First, the solar thermal collection system 200 collects heat, and uses the free piston Stirling ultra-high temperature heat pump 300 to absorb solar thermal heat, and further increases the temperature to heat the heat-carrying fluid and provide heat for the metallurgical system 400, thereby forming a complete clean metallurgical process and system. In the present utility model, the entire system is driven by solar energy, which greatly reduces carbon emissions, and by introducing the free piston Stirling ultra-high temperature heat pump 300, efficient coupling of solar thermal collection technology with hydrogen metallurgical technology and other technologies can be achieved.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A solar thermal collection and metallurgical coupling cogeneration system, characterized in that: include: A free piston Stirling ultra-high temperature heat pump, comprising a power piston, a low temperature heat exchanger and a high temperature heat exchanger, wherein the power piston is capable of reciprocating to transfer heat from the low temperature heat exchanger to the high temperature heat exchanger; a solar thermal collection system, thermally coupled to the low-temperature heat exchanger to transfer heat to the low-temperature heat exchanger; A metallurgical system is thermally coupled to the high temperature heat exchanger to absorb heat from the high temperature heat exchanger.

2. The solar thermal collection and metallurgical coupling cogeneration system according to claim 1 is characterized in that: The solar thermal collection system comprises a solar thermal collection device and a first pumping device. Wherein, the solar energy heat collection device, the low-temperature heat exchanger and the first pumping equipment are connected in sequence to form a solar energy heat exchange circulation loop.

3. The solar thermal collection and metallurgical coupling cogeneration system according to claim 1 is characterized in that: The metallurgical system includes a second pumping device and a metallurgical reaction furnace, Wherein, the second pumping equipment, the high-temperature heat exchanger and the metallurgical reaction furnace are connected in sequence to form a metallurgical heat exchange circulation loop.

4. The solar thermal collection and metallurgical coupling cogeneration system according to claim 3 is characterized in that: The metallurgical reactor is provided with an iron ore inlet and a hydrogen inlet, and the second pumping equipment, the high-temperature heat exchanger and the heat exchanger in the metallurgical reactor are sequentially connected to form the metallurgical heat exchange circulation loop. The heat exchanger exchanges heat with the iron ore introduced into the metallurgical reaction furnace through the iron ore inlet and the hydrogen introduced into the metallurgical reaction furnace through the hydrogen inlet to provide heat for the iron-making reduction reaction.

5. The solar thermal collection and metallurgical coupling cogeneration system according to claim 4 is characterized in that: The metallurgical reactor is also provided with a high-temperature pig iron outlet, and the solar thermal collection and metallurgical coupling cogeneration system also includes a first heat regenerator, Wherein, the high-temperature pig iron outlet is connected to the first heat regenerator, and the first heat regenerator is connected to the iron ore inlet, so that the iron ore can exchange heat with the high-temperature pig iron discharged from the high-temperature pig iron outlet in the first heat regenerator before entering the metallurgical reactor from the iron ore inlet.

6. The solar thermal collection and metallurgical coupling cogeneration system according to claim 4 is characterized in that: The metallurgical reactor is also provided with a high-temperature steam outlet, and the solar thermal collection and metallurgical coupling cogeneration system also includes a second heat regenerator. The high-temperature steam outlet is connected to the second reheater, and the second reheater is connected to the hydrogen inlet, so that the hydrogen can exchange heat with the high-temperature steam discharged from the high-temperature steam outlet in the second reheater before entering the metallurgical reactor from the hydrogen inlet.

7. The solar thermal collection and metallurgical coupling cogeneration system according to any one of claims 1 to 6, characterized in that: The heat carrier medium in the solar thermal collection system is molten salt, and / or the heat carrier medium in the metallurgical system is hydrogen.

8. The solar thermal collection and metallurgical coupling cogeneration system according to any one of claims 1 to 6, characterized in that: The free piston Stirling ultra-high temperature heat pump comprises a compressor unit and a heat pump unit connected to each other, a compression chamber is formed between the compressor unit and the heat pump unit, and the compression chamber is configured to be an extended compression chamber. The compressor unit comprises: The power piston is capable of reciprocating to perform work on the gas in the compression chamber; The dome cylinder is arranged on a side of the power piston facing the compression chamber.

9. The solar thermal collection and metallurgical coupling cogeneration system according to claim 8, characterized in that: The compressor unit further comprises: The radiation protection screen is arranged in the dome tube.

10. The solar thermal collection and metallurgical coupling cogeneration system according to claim 8, characterized in that: The heat pump unit comprises: The low-temperature heat exchanger, the regenerator and the high-temperature heat exchanger are sequentially arranged in a direction away from the compression chamber and close to the compression chamber; The displacer is arranged in the accommodation space surrounded by the low-temperature heat exchanger, the regenerator and the high-temperature heat exchanger. The compression chamber is formed between one end of the displacer and the power piston, and the other end of the displacer forms an expansion chamber.

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