High temperature clay indirect cooling waste heat recovery system

Abstract

The present invention provides a high-temperature clay indirect cooling waste heat recovery system, comprising: a high-temperature section spiral heat exchanger, an oil pump module, and an air heat exchanger; the first heat transfer oil inlet and the first heat transfer oil outlet of the high-temperature section spiral heat exchanger are respectively connected to the oil outlet of the high-temperature section oil pump module and the second heat transfer oil inlet of the high-temperature section air heat exchanger; the second heat transfer oil outlet of the high-temperature section air heat exchanger is connected to the oil inlet of the high-temperature section oil pump module; the second feed inlet of the low-temperature section spiral heat exchanger is connected to the first feed outlet of the high-temperature section spiral heat exchanger; the third heat transfer oil inlet and the third heat transfer oil outlet of the low-temperature section spiral heat exchanger are respectively connected to the oil outlet of the low-temperature section oil pump module and the fourth heat transfer oil inlet of the low-temperature section air heat exchanger; the fourth heat transfer oil outlet and the second air outlet of the low-temperature section air heat exchanger are respectively connected to the oil inlet of the low-temperature section oil pump module and the first air inlet of the high-temperature section air heat exchanger. This application realizes heat recovery and reuse.

Description

Technical Field

[0001] The invention relates to the technical field of clay calcining, and in particular to a high-temperature clay indirect cooling waste heat recovery system. Background Art

[0002] The clay industry, a traditional yet vibrant sector, has demonstrated steady global growth in recent years. Key products include, but are not limited to, handicrafts, decorative items, sculptures, building materials (such as bricks, tiles, and pipes), ceramics, and materials for certain new energy applications (such as fuel cells and solar cell components). These products are widely used in a variety of fields, including construction, ceramics, papermaking, rubber, and coatings, satisfying people's pursuit of beauty and daily needs.

[0003] During the clay calcining stage, the clay can be kept in a gray state under a reducing atmosphere of 600-900°C. In order to prevent the clay from coming into contact with oxygen in the air during the cooling stage and being oxidized to red, and then being mixed into the clinker and affecting the color of the cement and thus affecting sales, the clay cooling process should not only cool the calcined high-temperature clay to below 300°C, but also ensure that the cooled clay does not produce oxidation discoloration.

[0004] While existing clay cooling methods can cool calcined clay, they suffer from poor cooling performance and lack consideration for heat recovery and reuse, resulting in heat waste. Therefore, improving the cooling performance of calcined clay and enabling heat recovery and reuse are pressing technical challenges. Summary of the Invention

[0005] In view of this, an embodiment of the present invention provides a high-temperature clay indirect cooling waste heat recovery system to eliminate or improve one or more defects in the prior art.

[0006] One aspect of the present invention provides a high-temperature clay indirect cooling waste heat recovery system, the system comprising:

[0007] The first-stage waste heat recovery device includes a high-temperature section spiral heat exchanger, a high-temperature section oil pump module, and a high-temperature section air heat exchanger. The high-temperature section spiral heat exchanger has a first feed port, a first feed port, a first heat transfer oil inlet, and a first heat transfer oil outlet. The high-temperature section air heat exchanger has a first air inlet, a first air outlet, a second heat transfer oil inlet, and a second heat transfer oil outlet. The first feed port is used to input high-temperature clay to be cooled. The first heat transfer oil inlet is connected to the oil outlet end of the high-temperature section oil pump module. The first heat transfer oil outlet is connected to the second heat transfer oil inlet of the high-temperature section air heat exchanger. The second heat transfer oil outlet of the high-temperature section air heat exchanger is connected to the oil inlet end of the high-temperature section oil pump module.

[0008] The second-stage waste heat recovery device includes a low-temperature section spiral heat exchanger, a low-temperature section oil pump module and a low-temperature section air heat exchanger. The low-temperature section spiral heat exchanger has a second feed port, a second discharge port, a third heat transfer oil inlet and a third heat transfer oil outlet. The low-temperature section air heat exchanger has a second air inlet, a second air outlet, a fourth heat transfer oil inlet and a fourth heat transfer oil outlet. The second feed port is connected to the first discharge port, the third heat transfer oil inlet is connected to the oil outlet end of the low-temperature section oil pump module, the third heat transfer oil outlet is connected to the fourth heat transfer oil inlet of the low-temperature section air heat exchanger, the fourth heat transfer oil outlet of the low-temperature section air heat exchanger is connected to the oil inlet end of the low-temperature section oil pump module, the second air inlet of the low-temperature section air heat exchanger is used to input room temperature air, and the second air outlet of the low-temperature section air heat exchanger is connected to the first air inlet of the high-temperature section air heat exchanger.

[0009] In some embodiments of the present invention, the high-temperature section spiral heat exchanger and the low-temperature section spiral heat exchanger both include a shell, a spiral blade rotating shaft and a first heat transfer oil pipe. The shell has a hollow portion, the spiral blade rotating shaft is located in the hollow portion, and the first heat transfer oil pipe is laid on the shell.

[0010] In some embodiments of the present invention, the first heat transfer oil pipe is laid on the shell in an "S" structure, and both ends of the first heat transfer oil pipe are respectively connected to the corresponding heat transfer oil inlet and heat transfer oil outlet.

[0011] In some embodiments of the present invention, the shell includes an upper shell and a lower shell, both of the upper shell and the lower shell are double-layer shells, and the first heat-conducting oil pipe is located between the double-layer shells.

[0012] In some embodiments of the present invention, the high-temperature section spiral heat exchanger and the low-temperature section spiral heat exchanger also include a transmission module and a feed module, the transmission module includes a driving component and a transmission mechanism, the input end and output end of the transmission mechanism are respectively connected to the driving component and the spiral blade rotating shaft, and the output end of the feed module is connected to the first feed port or the second feed port.

[0013] In some embodiments of the present invention, a material leveling plate is provided inside the feed module.

[0014] In some embodiments of the present invention, there are multiple spiral blade rotating shafts, and all of the multiple spiral blade rotating shafts are hollow shafts. A second heat transfer oil pipe is provided in the central axis hole of the spiral blade rotating shaft, and the spiral blades of two adjacent spiral blade rotating shafts are arranged in an staggered manner.

[0015] In some embodiments of the present invention, the high-temperature section oil pump module and the low-temperature section oil pump module both include an oil storage tank and a circulation pump, and the oil storage tank and the corresponding oil pipes are both provided with an insulation layer on the outside.

[0016] In some embodiments of the present invention, the oil storage tank includes an oil-gas separator.

[0017] In some embodiments of the present invention, the high-temperature section spiral heat exchanger and the low-temperature section spiral heat exchanger both have an exhaust gas outlet and an oil drain port; and / or, the high-temperature section spiral heat exchanger and the low-temperature section spiral heat exchanger are both horizontal spiral heat exchangers.

[0018] The high-temperature clay indirect cooling waste heat recovery system disclosed in the above embodiment of the present invention includes a first-stage waste heat recovery device and a second-stage waste heat recovery device. The feed port of the second-stage waste heat recovery device is connected to the discharge port of the first-stage waste heat recovery device, and each stage of the waste heat recovery device is equipped with a separate oil pump module and an air heat exchanger. The system allows the calcined clay to pass through the two-stage waste heat recovery device for cooling and cooling, and at the same time as the cooling and cooling at each stage, the heat of the clay carried away by the heat transfer oil is recovered through the air heat exchanger. That is, the system can efficiently cool the calcined clay while also realizing heat recovery and reuse. Therefore, the high-temperature clay indirect cooling waste heat recovery system of the present application improves the cooling efficiency of the calcined clay, avoids the waste of clay heat, and realizes the recovery and reuse of clay heat.

[0019] Additional advantages, objects, and features of the present invention will be set forth in part in the following description and will become apparent to those skilled in the art upon examination of the following or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained by the structures particularly pointed out in the description and drawings.

[0020] Those skilled in the art will understand that the purposes and advantages that can be achieved by the present invention are not limited to the above specific descriptions, and the above and other purposes that can be achieved by the present invention will be more clearly understood based on the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are intended to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are merely for the purpose of illustrating the principles of the present invention. To facilitate the illustration and description of certain portions of the present invention, corresponding portions in the drawings may be exaggerated, that is, may be larger than other components in an exemplary device actually manufactured according to the present invention. In the drawings:

[0022] Figure 1 This is a structural diagram of a high-temperature clay indirect cooling waste heat recovery system according to an embodiment of the present invention.

[0023] Figure 2 This is a front view of a high-temperature section spiral heat exchanger according to an embodiment of the present invention.

[0024] Figure 3 for Figure 2 The top view of the high temperature section spiral heat exchanger is shown.

[0025] Figure 4 for Figure 2 The side view of the high temperature section spiral heat exchanger is shown.

[0026] Figure 5 This is a structural schematic diagram of a transmission module of a spiral heat exchanger according to an embodiment of the present invention.

[0027] Figure 6 Schematic diagram of the structure of the upper shell of a spiral heat exchanger according to an embodiment of the present invention.

[0028] Figure 7 Schematic diagram of the arrangement of the rotating shafts of the spiral blades of a spiral heat exchanger according to an embodiment of the present invention.

[0029] Figure 8 The figure is a schematic diagram of the rotary seal structure at the shaft end of the spiral blade rotary shaft according to an embodiment of the present invention.

[0030] Figure 9 This is a schematic structural diagram of a feed module of a spiral heat exchanger according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] High-temperature section spiral heat exchanger 100 High-temperature section air heat exchanger 200 First feed inlet 110 First discharge port 120 First thermal oil inlet 130 First thermal oil outlet 140 First air inlet 210 First air outlet 220 Second thermal oil inlet 230 Second thermal oil outlet 240 Low-temperature section spiral heat exchanger 300 Low-temperature section air heat exchanger 400 Second feed inlet 310 Second discharge port 320 Third thermal oil inlet 330 Third thermal oil outlet 340 Second air inlet 410 Second air outlet 420 Fourth thermal oil inlet 430 Fourth thermal oil outlet 440 Upper housing 510 Lower housing 520 Spiral blade rotating shaft 530 First thermal oil pipe 540 Transmission module 550 Feed module 560 Drive component 551 Transmission mechanism 552 Oil storage tank 571 Circulation pump 572 Exhaust gas outlet 581 Oil drain port 582 Shaft heat transfer oil inlet 591 Shaft heat transfer oil outlet 592 DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0034] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, the accompanying drawings only show structures and / or processing steps closely related to the solutions according to the present invention, while other details that are not closely related to the present invention are omitted.

[0035] It should be emphasized that the term "include / comprises" when used herein refers to the existence of features, elements, steps or components, but does not exclude the existence or addition of one or more other features, elements, steps or components.

[0036] It should also be noted that, unless otherwise specified, the terms "mounted," "connected," "connected," and "fixed" should be understood broadly. For example, "connected" can mean fixed or removable connection; mechanical or electrical connection; direct connection or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0037] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0038] Figure 1 FIG. 1 is a structural diagram of a high-temperature clay indirect cooling waste heat recovery system according to an embodiment of the present invention. Figure 1 As shown, the high-temperature clay indirect cooling waste heat recovery system includes at least a first-stage waste heat recovery device and a second-stage waste heat recovery device. The first-stage waste heat recovery device includes a high-temperature section spiral heat exchanger 100, a high-temperature section oil pump module and a high-temperature section air heat exchanger 200. The second-stage waste heat recovery device includes a low-temperature section spiral heat exchanger 300, a low-temperature section oil pump module and a low-temperature section air heat exchanger 400.

[0039] The high-temperature section spiral heat exchanger 100 has a first feed port 110, a first discharge port 120, a first thermal oil inlet 130 and a first thermal oil outlet 140. The high-temperature section air heat exchanger 200 has a first air inlet 210, a first air outlet 220, a second thermal oil inlet 230 and a second thermal oil outlet 240. The first feed port 110 is used to input high-temperature clay to be cooled, the first thermal oil inlet 130 is connected to the oil outlet end of the high-temperature section oil pump module, the first thermal oil outlet 140 is connected to the second thermal oil inlet 230 of the high-temperature section air heat exchanger 200, and the second thermal oil outlet 240 of the high-temperature section air heat exchanger 200 is connected to the oil inlet end of the high-temperature section oil pump module. The low-temperature section spiral heat exchanger 300 has a second feed port 310, a second discharge port 320, a third thermal oil inlet 330 and a third thermal oil outlet 340. The low-temperature section air heat exchanger 400 has a second air inlet 410, a second air outlet 420, a fourth thermal oil inlet 430 and a fourth thermal oil outlet 440. The second feed port 310 is connected to the first discharge port 120, the third thermal oil inlet 330 is connected to the oil outlet end of the low-temperature section oil pump module, the third thermal oil outlet 340 is connected to the fourth thermal oil inlet 430 of the low-temperature section air heat exchanger 400, and the fourth thermal oil outlet 440 of the low-temperature section air heat exchanger 400 is connected to the oil inlet end of the low-temperature section oil pump module. The second air inlet 410 of the low-temperature section air heat exchanger 400 is used to input room temperature air, and the second air outlet 420 of the low-temperature section air heat exchanger 400 is connected to the first air inlet 210 of the high-temperature section air heat exchanger 200.

[0040] In the above embodiment, the discharge port of the high-temperature spiral heat exchanger 100 is connected to the feed port of the low-temperature spiral heat exchanger 300, that is, the calcined clay is further transported to the low-temperature spiral heat exchanger 300 for secondary cooling after being cooled by the high-temperature spiral heat exchanger 100. In addition, both the first-stage waste heat recovery device and the second-stage waste heat recovery device include independent oil pump modules and air heat exchangers. That is, when the calcined clay is cooled based on the high-temperature spiral heat exchanger 100, the heat transfer oil output by the high-temperature oil pump module circulates, and the heat inside the high-temperature spiral heat exchanger 100 is transferred to the high-temperature air heat exchanger 200. In the high-temperature air heat exchanger 200, high-temperature heat exchange is realized between the heat transfer oil and the air, thereby realizing heat recovery during the high-temperature cooling process of the calcined clay; in addition, when the calcined clay that has been cooled at high temperature is cooled for the second time based on the low-temperature spiral heat exchanger 300, the heat transfer oil output by the low-temperature oil pump module circulates, and the heat of the calcined clay is transferred to the low-temperature air heat exchanger 400, and low-temperature heat exchange is realized between the heat transfer oil and the air in the low-temperature air heat exchanger 400. In the high-temperature clay indirect cooling waste heat recovery system of the present application, the calcined clay passes through the high-temperature section spiral heat exchanger 100 and the low-temperature section spiral heat exchanger 300 in sequence for two-stage cooling, while the indoor air passes through the low-temperature section air heat exchanger 400 and the high-temperature section air heat exchanger 200 in sequence for two-stage heating. This system not only improves the cooling efficiency of the calcined clay, but also realizes the heat recovery and reuse of the calcined clay.

[0041] In some embodiments of the present invention, the high-temperature section spiral heat exchanger 100 and the low-temperature section spiral heat exchanger 300 each include a shell, a spiral blade rotating shaft 530, and a first heat transfer oil pipe 540. The shell has a hollow portion, the spiral blade rotating shaft 530 is located in the hollow portion, and the first heat transfer oil pipe 540 is laid on the shell. For ease of description, the high-temperature section spiral heat exchanger 100 and the low-temperature section spiral heat exchanger 300 are collectively referred to as spiral heat exchangers. Figure 2As shown, the spiral heat exchanger is a horizontal structure, that is, the high-temperature section spiral heat exchanger 100 and the low-temperature section spiral heat exchanger 300 are both horizontal spiral heat exchangers; in this embodiment, the feed inlet (the first feed inlet 110 and the second feed inlet 310) are located at the upper left end of the shell, the discharge outlet (the first discharge outlet 120 and the second discharge outlet 320) are located at the lower right end of the shell, the first heat transfer oil inlet 130 and the third heat transfer oil inlet 330 are located at the left end of the shell, and the first heat transfer oil outlet 110 and the second heat transfer oil outlet 310 are located at the lower right end of the shell. The inlet 140 and the third thermal oil outlet 340 are located at the right end of the shell. The first thermal oil pipe 540 is used to connect the thermal oil inlet and the thermal oil outlet, so that the thermal oil output by the oil pump module can flow in the first thermal oil pipe 540. As a result, the calcined clay entering the hollow part of the spiral heat exchanger through the feed port is further transported to the air heat exchanger based on the thermal oil flowing in the first thermal oil pipe 540 under the rotation of the spiral blade rotating shaft 530.

[0042] Furthermore, the first heat transfer oil pipe 540 is laid on the shell in an "S" structure, and the two ends of the first heat transfer oil pipe 540 are respectively connected to the corresponding heat transfer oil inlet and heat transfer oil outlet. In this embodiment, the two ends of the first heat transfer oil pipe 540 on the high-temperature section spiral heat exchanger 100 are respectively connected to the first heat transfer oil inlet 130 and the first heat transfer oil outlet 140, while the two ends of the first heat transfer oil pipe 540 on the low-temperature section spiral heat exchanger 300 are respectively connected to the third heat transfer oil inlet 330 and the third heat transfer oil outlet 340. Figure 3 The first heat transfer oil pipe 540 is arranged in an S-shape on the housing of the spiral heat exchanger. In this embodiment, the S-shaped arrangement of the heat transfer oil pipe allows for more efficient heat exchange between the heat transfer oil and the calcined clay. It will be appreciated that the arrangement of the heat transfer oil pipes defined in this embodiment is merely an example. In other embodiments, the heat transfer oil pipes may be arranged in other shapes besides the S-shape, as long as effective heat exchange between the heat transfer oil and the calcined clay is achieved.

[0043] In one embodiment, the shell of the spiral heat exchanger may specifically include an upper shell 510 and a lower shell 520. The upper shell 510 and the lower shell 520 may be connected by screws or the like. In this case, the cross-sections of the upper shell 510 and the lower shell 520 may each be C-shaped or U-shaped. When the cross-sections of the upper shell 510 and the lower shell 520 are U-shaped, the lower shell 520 may be considered to be formed from a U-shaped steel plate. Furthermore, to facilitate the arrangement of the first thermal oil pipe 540, both the upper shell 510 and the lower shell 520 are double-layered shells, with the first thermal oil pipe 540 located between the two layers. In this embodiment, the double-layered shells are both steel plates, and the first thermal oil pipe 540 is located between the two layers of steel plates. This allows for better heat transfer between the steel plates between the thermal oil pipe and the calcined clay, thereby ensuring efficient heat exchange between the thermal oil and the calcined clay. When the first heat conducting oil pipe 540 is arranged in an S shape, a grooved partition plate may be provided between the double-layer shells, and the multiple grooves on the partition plate are arranged in parallel, that is, the first heat conducting oil pipe 540 may be arranged in the grooves.

[0044] Figure 6 FIG. 5 is a structural diagram of the upper shell 510 of the spiral heat exchanger according to an embodiment of the present invention. Figure 6 As described above, the S-shaped first heat transfer oil pipe 540 is distributed throughout the upper shell 510 , that is, the heat transfer oil flowing through the first heat transfer oil pipe 540 takes away the heat transferred from the calcined clay to the upper shell 510 .

[0045] In addition, the spiral blade rotating shaft 530 located in the hollow part of the spiral heat exchanger can push the calcined clay from the feed port of the shell toward the discharge port while rotating. The spiral blade rotating shaft 530 includes a shaft body and a plurality of spiral blades arranged outside the shaft body. In this embodiment, the spiral blade rotating shaft 530 can also be made of steel, and the spiral blade rotating shaft 530 is a hollow shaft, and a second heat transfer oil pipe is provided in the central shaft hole of the shaft body. The second heat transfer oil pipe is similar to the first heat transfer oil pipe, and the two ends of the second heat transfer oil pipe are respectively connected to the oil outlet and oil inlet of the oil pump module. Figure 3As shown, the right end of the spiral heat exchanger's housing is provided with a shaft heat transfer oil inlet 591 and a shaft heat transfer oil outlet 592. A second heat transfer oil pipe is located within the central axial hole of the shaft body, with its ends connected to the shaft heat transfer oil inlet 591 and the shaft heat transfer oil outlet 592, respectively. In this embodiment, the shaft heat transfer oil inlet 591 and the shaft heat transfer oil outlet 592 are connected to the oil outlet and oil inlet of the oil pump module, respectively. As the heat transfer oil in the second heat transfer oil pipe flows, it removes heat transferred from the calcined clay to the spiral blade rotating shaft 530. Furthermore, to recover the heat from the heat transfer oil in the second heat transfer oil pipe, the shaft heat transfer oil outlet 592 is further connected to the heat transfer oil inlet of the air heat exchanger. This heat transfer oil is then transported to the air heat exchanger, where it heats the air in the air heat exchanger, thereby achieving heat exchange between the heat transfer oil and the air, thereby achieving heat recovery and reuse.

[0046] Furthermore, there are multiple spiral blade rotating shafts 530 in the hollow portion of the spiral heat exchanger, the shafts of the multiple spiral blade rotating shafts 530 are parallel to each other, and the spiral blades of two adjacent spiral blade rotating shafts 530 are arranged in a staggered manner. Figure 7 As shown, in this embodiment, the shaft bodies of the multiple spiral blade rotating shafts 530 are all hollow shaft structures, and a second heat transfer oil pipe is provided in the central shaft hole of the shaft body; for example, the number of spiral blade rotating shafts 530 can be four, in which case four sets of shaft heat transfer oil inlets and outlets can be provided at the right end of the shell of the spiral heat exchanger, and the four shaft heat transfer oil outlets 592 are all connected to the heat transfer oil inlet of the air heat exchanger at the rear end, so as to more efficiently achieve indirect heat exchange between calcined clay and air. In addition, in order to ensure the sealing performance of the spiral blade rotating shaft 530, the end of each spiral blade rotating shaft 530 can be provided with a shaft end rotating sealing structure. The schematic diagram of the shaft end rotating sealing structure of the spiral blade rotating shaft 530 is shown in FIG. Figure 8 shown.

[0047] In some embodiments of the present invention, the high-temperature section spiral heat exchanger 100 and the low-temperature section spiral heat exchanger 300 further include a transmission module 550 and a feed module 560. The transmission module 550 includes a driving component 551 and a transmission mechanism 552. The input end and output end of the transmission mechanism 552 are respectively connected to the driving component 551 and the spiral blade rotating shaft 530. The output end of the feed module 560 is connected to the first feed port 110 or the second feed port 310. In this embodiment, the spiral blade rotating shaft 530 of the spiral heat exchanger is driven to rotate by the transmission module 550, so that the spiral blade rotating shaft 530 pushes the calcined clay inside the spiral heat exchanger to the discharge port while rotating, so as to output or transport the calcined clay from the spiral heat exchanger to the next-level waste heat recovery device. Exemplarily, the driving component 551 can be a variable frequency speed regulating motor, and the transmission mechanism 552 includes a gear mechanism; Figure 5 FIG. 1 is a schematic structural diagram of a transmission module of a spiral heat exchanger according to an embodiment of the present invention. Figure 5 As shown, the transmission module 550 specifically includes a variable frequency speed-regulating motor, a speed reducer, transmission gears, and supporting components. The variable frequency speed-regulating motor is used to adjust the speed and direction of the spiral blade rotating shaft 530 to meet the varying requirements of different projects for calcined clay production, material temperature, and air temperature. In this embodiment, the output end of the variable frequency speed-regulating motor is connected to the input end of the speed reducer, which is in turn connected to the driving gear of a gear transmission mechanism 552. The driven gear of the gear transmission mechanism 552 drives the spiral blade rotating shaft 530 to rotate. It will be appreciated that the use of gear transmission in this embodiment is merely an example; in other embodiments, other transmission mechanisms 552 besides gear transmission may also be used.

[0048] In addition, the feed module 560 is used to transport the clay to be cooled into the interior of the spiral heat exchanger, that is, the feed inlet of the high-temperature section spiral heat exchanger 100 and the low-temperature section spiral heat exchanger 300 are both provided with a feed module 560, Figure 1 and Figure 4 The feed module 560 is located above the left end of the high-temperature spiral heat exchanger 100 and the low-temperature spiral heat exchanger 300. In this embodiment, the first discharge port 120 on the high-temperature spiral heat exchanger 100 is connected to the feed module 560 above the low-temperature spiral heat exchanger 300, that is, the clay output from the high-temperature spiral heat exchanger 100 is transported to the feed module 560 above the low-temperature spiral heat exchanger 300. Further, as Figure 9 As shown, the feed module 560 has a material distribution plate inside, which can evenly distribute the clay transported to the feed module 560 on multiple spiral blade rotating shafts 530, so that the clay inside the spiral heat exchanger can be evenly transported from the feed port to the discharge port through the spiral blades on the spiral blade rotating shaft 530.

[0049] In the above embodiment, high-temperature clay enters the high-temperature section spiral heat exchanger 100 from the feed module 560 and the first feed port 110 on the high-temperature section spiral heat exchanger 100, and the transmission module 550 drives the spiral blade rotating shaft 530 to rotate, that is, the spiral blade slowly and uniformly pushes the clay to move to the other end of the high-temperature section spiral heat exchanger 100 and is discharged from the first discharge port 120 of the high-temperature section spiral heat exchanger 100; at the same time, the heat transfer oil in the first heat transfer oil pipe 540 located on the shell and the second heat transfer oil pipe located inside the shaft body of the spiral blade rotating shaft 530 exchanges heat with the clay, thereby achieving the first cooling of the calcined clay. Furthermore, the clay output from the first discharge port 120 is further transported to the feed module 560 of the low-temperature spiral heat exchanger 300. The feed module 560 further transports the clay to the interior of the low-temperature spiral heat exchanger 300 through the second feed port 310. The transmission module 550 of the low-temperature spiral heat exchanger 300 drives the spiral blade rotating shaft 530 to rotate, that is, the rotation of the spiral blade rotating shaft 530 pushes the clay entering from the second feed port 310 to the second discharge port 320 for discharge; at the same time, the heat transfer oil in the first heat transfer oil pipe 540 located on the shell of the low-temperature spiral heat exchanger 300 and the second heat transfer oil pipe located inside the shaft body of the spiral blade rotating shaft 530 performs secondary heat exchange with the clay, thereby realizing the second cooling of the calcined clay, that is, reducing the temperature of the high-temperature clay to below 150°C. In addition, the heat transfer oil with the heat of the clay absorbed by the second stage waste heat recovery device is transported to the low temperature section air heat exchanger 400, and the heat transfer oil with the heat of the clay absorbed by the first stage waste heat recovery device is transported to the high temperature section air heat exchanger 200, that is, the room temperature air is transported to the low temperature section air heat exchanger 400 through the second air inlet 410 of the low temperature section air heat exchanger 400, and the room temperature air is heated to about 180°C by the heat transfer oil transported to the low temperature section air heat exchanger 400. The first heated air is further discharged from the second air outlet of the low temperature section air heat exchanger 400. 420 is transported to the first air inlet 210 of the high-temperature section air heat exchanger 200, and the air is secondary heated in the high-temperature section air heat exchanger 200 using the heat transfer oil transported to the high-temperature section air heat exchanger 200. The temperature of the secondary heated air is approximately above 320°C, and the secondary heated air in the high-temperature section air heat exchanger 200 can be further used for drying and other processes. It can be seen that the high-temperature clay indirect cooling waste heat recovery system of the present application can not only efficiently cool the calcined clay, but also further realize the recovery and reuse of the clay heat.

[0050] In some embodiments of the present invention, both the high-temperature and low-temperature oil pump modules include an oil tank 571 and a circulating pump 572. The oil tank 571 is provided with an insulating layer. Furthermore, the oil tank 571 may include an oil-gas separator, through which air is expelled during oil circulation. In addition to the oil tank 571 and circulating pump 572, the oil pump module may also include piping and valve components. To facilitate more efficient heat exchange between the thermal oil and the calcined clay, both the oil tank 571 and the piping may be provided with an insulating layer. Specifically, the insulating layer may be a thermally insulating material wrapped around the oil tank 571 and the piping.

[0051] In addition, in order to discharge the waste gas and residual oil in the spiral heat exchanger, the high temperature section spiral heat exchanger 100 and the low temperature section spiral heat exchanger 300 both have a waste gas outlet 581 and an oil drain port 582. Figure 2 The exhaust gas outlet 581 may be specifically located at the right end of the upper shell 510 , and the oil drain port 582 may be specifically located at the right end of the lower shell 520 .

[0052] The high-temperature clay indirect cooling waste heat recovery system described in the above embodiment is divided into two heat exchange sections: high-temperature and low-temperature. Specifically, the high-temperature clay is cooled stepwise to below 150°C by two spiral heat exchangers connected in series, while the room-temperature air is heated stepwise to above 320°C by two air heaters connected in series. Clay cooling occurs from the high-temperature section to the low-temperature section, while air heating occurs from the low-temperature section to the high-temperature section, creating a countercurrent heat exchange mechanism. The circulating oil systems for the high-temperature and low-temperature sections are independent, improving insulation and heat exchange efficiency.

[0053] After calcination, the clay reaches a temperature of 600-900°C before entering the high-temperature spiral heat exchanger 100. The spiral heat exchanger comprises a double-layered lower shell 520, an upper shell 510 with an S-shaped heat transfer oil pipe, and a hollow spiral blade rotating shaft 530. After entering the spiral conveyor, the high-temperature clay is evenly distributed in the grooves formed by the multiple spiral blades and is evenly and slowly pushed to the discharge port. During this process, the clay is cooled by heat exchange with the heat exchange oil flowing in the first and second heat transfer oil pipes 540 and 541. After two stages of heat exchange, the high-temperature clay is cooled to below 150°C. The high-temperature heat-resistant oil is discharged from the oil storage tank 571 by a circulation pump 572 and transported to the heat transfer oil pipes of the upper and lower shells 510 and 520 of the spiral heat exchanger, where it exchanges heat with the high-temperature clay. The oil then enters the air heat exchanger to heat the air before returning to the oil storage tank 571 for the next heat exchange cycle. Room temperature air first enters the low-temperature air heat exchanger 400 for primary heating, and then enters the high-temperature air heat exchanger 200 for secondary heating, that is, the room temperature air is heated to above 320°C in two stages. Through the above embodiments, it can be found that the high-temperature clay indirect cooling waste heat recovery system of the present application uses thermal oil as the conduction medium, and at the same time combines an air heat exchanger as a heat recovery component, which not only achieves efficient heat exchange of the high-temperature clay, but also realizes heat recovery and reuse. In addition, the cooling of the clay is divided into high-temperature cooling and low-temperature cooling. The thermal oil used in the two-stage cooling process circulates independently, further improving the heat exchange efficiency and heat recovery efficiency.

[0054] In the present invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or replace features of other embodiments.

[0055] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will appreciate that various modifications and variations are possible with the present invention. For example, the system disclosed herein is a two-stage series waste heat recovery device. In other embodiments, the system may be a three-stage or more series waste heat recovery device. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A high-temperature clay indirect cooling waste heat recovery system, characterized in that: The system comprises: The first-stage waste heat recovery device includes a high-temperature section spiral heat exchanger, a high-temperature section oil pump module, and a high-temperature section air heat exchanger. The high-temperature section spiral heat exchanger has a first feed port, a first feed port, a first heat transfer oil inlet, and a first heat transfer oil outlet. The high-temperature section air heat exchanger has a first air inlet, a first air outlet, a second heat transfer oil inlet, and a second heat transfer oil outlet. The first feed port is used to input high-temperature clay to be cooled. The first heat transfer oil inlet is connected to the oil outlet end of the high-temperature section oil pump module. The first heat transfer oil outlet is connected to the second heat transfer oil inlet of the high-temperature section air heat exchanger. The second heat transfer oil outlet of the high-temperature section air heat exchanger is connected to the oil inlet end of the high-temperature section oil pump module. The second-stage waste heat recovery device includes a low-temperature section spiral heat exchanger, a low-temperature section oil pump module and a low-temperature section air heat exchanger. The low-temperature section spiral heat exchanger has a second feed port, a second discharge port, a third heat transfer oil inlet and a third heat transfer oil outlet. The low-temperature section air heat exchanger has a second air inlet, a second air outlet, a fourth heat transfer oil inlet and a fourth heat transfer oil outlet. The second feed port is connected to the first discharge port, the third heat transfer oil inlet is connected to the oil outlet end of the low-temperature section oil pump module, the third heat transfer oil outlet is connected to the fourth heat transfer oil inlet of the low-temperature section air heat exchanger, the fourth heat transfer oil outlet of the low-temperature section air heat exchanger is connected to the oil inlet end of the low-temperature section oil pump module, the second air inlet of the low-temperature section air heat exchanger is used to input room temperature air, and the second air outlet of the low-temperature section air heat exchanger is connected to the first air inlet of the high-temperature section air heat exchanger.

2. The high-temperature clay indirect cooling waste heat recovery system according to claim 1 is characterized in that: The high-temperature section spiral heat exchanger and the low-temperature section spiral heat exchanger both include a shell, a spiral blade rotating shaft and a first heat transfer oil pipe. The shell has a hollow portion, the spiral blade rotating shaft is located in the hollow portion, and the first heat transfer oil pipe is laid on the shell.

3. The high-temperature clay indirect cooling waste heat recovery system according to claim 2, characterized in that: The first heat transfer oil pipe is laid on the shell in an "S" structure, and both ends of the first heat transfer oil pipe are respectively connected to the corresponding heat transfer oil inlet and heat transfer oil outlet.

4. The high-temperature clay indirect cooling waste heat recovery system according to claim 2, characterized in that: The shell includes an upper shell and a lower shell, both of which are double-layer shells, and the first heat-conducting oil pipe is located between the double-layer shells.

5. The high-temperature clay indirect cooling waste heat recovery system according to claim 2, characterized in that: The high-temperature section spiral heat exchanger and the low-temperature section spiral heat exchanger also include a transmission module and a feed module. The transmission module includes a driving component and a transmission mechanism. The input end and output end of the transmission mechanism are respectively connected to the driving component and the spiral blade rotating shaft. The output end of the feed module is connected to the first feed port or the second feed port.

6. The high-temperature clay indirect cooling waste heat recovery system according to claim 5, characterized in that: The feed module is provided with a material balancing plate inside.

7. The high-temperature clay indirect cooling waste heat recovery system according to claim 2, characterized in that: There are multiple spiral blade rotating shafts, and all of them are hollow shafts. A second heat transfer oil pipe is provided in the central shaft hole of each spiral blade rotating shaft, and the spiral blades of two adjacent spiral blade rotating shafts are arranged in an alternating manner.

8. The high-temperature clay indirect cooling waste heat recovery system according to claim 1, characterized in that: The high-temperature section oil pump module and the low-temperature section oil pump module both include an oil storage tank and a circulation pump. The oil storage tank and the corresponding oil pipes are both provided with an insulation layer on the outside.

9. The high-temperature clay indirect cooling waste heat recovery system according to claim 8, characterized in that: The oil storage tank includes an oil-gas separator.

10. The high-temperature clay indirect cooling waste heat recovery system according to any one of claims 1 to 9, characterized in that: The high-temperature section spiral heat exchanger and the low-temperature section spiral heat exchanger both have an exhaust gas outlet and an oil drain port; and / or, The high-temperature section spiral heat exchanger and the low-temperature section spiral heat exchanger are both horizontal spiral heat exchangers.

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