Rotary kiln waste heat recovery refrigeration device and rotary kiln cooling system

Abstract

The utility model provides a rotary kiln waste heat recovery refrigerating device and a rotary kiln cooling system. The rotary kiln waste heat recovery refrigerating device comprises a material calcining kiln, a material cooling kiln, a waste heat exchanger, a flue gas emission heat conduction pipe and a waste heat driving type adsorption refrigerating machine. The material cooling kiln comprises a rotary cylinder and a spray cooling mechanism, and the spray cooling mechanism is arranged on the outer side of the rotary cylinder; the air inlet end of the flue gas emission heat conduction pipe is communicated with the material calcining kiln, and the exhaust end of the flue gas emission heat conduction pipe penetrates through the waste heat exchange cavity and extends out of the waste heat exchanger; a cooling liquid overflowing gap is formed between the outer wall of the flue gas emission heat conduction pipe and the cavity wall of the waste heat exchange cavity; the waste heat driving type adsorption refrigerator is communicated with the spray cooling mechanism and the cooling liquid overflowing gap for heat exchange, refrigeration is more energy-saving and environment-friendly by recycling waste heat of high-temperature flue gas, and meanwhile, cooling of the material calcining kiln is further accelerated by cooled spray water, so that the cooling efficiency of materials is higher.

Description

Technical Field

[0001] The present disclosure relates to the technical field of rotary kiln cooling, and in particular to a rotary kiln waste heat recovery refrigeration device and a rotary kiln cooling system. Background Art

[0002] The rotary kiln is a rotating calcining device that performs mechanical, physical or chemical treatment on solid materials. It is widely used in the production industries of building materials, metallurgy, chemical industry, environmental protection, etc. After the rotary kiln completes the calcination of solid materials, a large amount of high-temperature flue gas will evaporate from the solid materials. The waste heat of the high-temperature flue gas reaches 200℃~300℃, which makes the cooling process of the rotary kiln extremely slow. In order to improve the speed and effect of the rotary kiln cooling, some manufacturers have carried out research and development.

[0003] For example, Chinese patent document CN107238285A discloses a cooling circulation system for the surface of a rotary kiln, including a cooling unit, a hot water recovery unit and a heat exchange unit. The cooling unit includes a water inlet main pipe, a plurality of spray pipes, a plurality of nozzles, a water retaining device and a water receiving device; each spray pipe is an arc-shaped pipe, and a plurality of spray pipes are arranged on the periphery of the kiln body with the opening facing downward and each is connected to the water inlet main pipe through a water inlet branch pipe; a plurality of nozzles are radially installed on a plurality of water spray ports of each spray pipe in a one-to-one correspondence; the water retaining device includes a water retaining cover and a cover plate; the water retaining cover is arranged on the periphery of a plurality of spray pipes; the water receiving device includes a plurality of water receiving tanks; the hot water recovery unit includes a plurality of water outlet branches and a buffer tank; the heat exchange unit includes a hot water delivery pipe, a heat exchanger and a waste heat recovery circulation device.

[0004] However, the design of the cooling circulation system on the surface of the rotary kiln has the following problems:

[0005] The above-mentioned cooling circulation system on the surface of the rotary kiln can spray water on the surface of the rotary kiln through the spray pipe to cool down the surface, but as the cooling continues, the water sprayed by the spray pipe will evaporate to form a large amount of hot steam, which not only easily causes waste of water resources, but also easily deteriorates the operating environment. At the same time, the high-temperature flue gas in the rotary kiln is dissipated to the surrounding environment through heat conduction with the kiln wall of the rotary kiln, which will further deteriorate the operating environment. Utility Model Content

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a rotary kiln waste heat recovery refrigeration device and a rotary kiln cooling system with good cooling effect and low water consumption.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A rotary kiln waste heat recovery refrigeration device comprises a material calcining kiln and a material cooling kiln which are arranged obliquely, wherein the lower end of the material calcining kiln is connected to the higher end of the material cooling kiln; the material cooling kiln comprises a rotary cylinder and a spray cooling mechanism, wherein the spray cooling mechanism is arranged on the outer side of the rotary cylinder and has a plurality of spray holes opened toward the cylinder wall of the rotary cylinder;

[0009] The rotary kiln waste heat recovery refrigeration device also includes a waste heat heat exchanger, a flue gas discharge heat conduction pipe and a waste heat driven adsorption refrigerator;

[0010] A waste heat exchange cavity is provided in the waste heat exchanger, an air inlet end of the flue gas discharge heat conduction pipe is connected to a higher end of the material calcining kiln, an exhaust end of the flue gas discharge heat conduction pipe passes through the waste heat exchange cavity, and extends outside the waste heat exchanger to form an exhaust port; a coolant flow gap is formed between the outer wall of the flue gas discharge heat conduction pipe and the cavity wall of the waste heat exchange cavity;

[0011] The waste heat driven adsorption refrigeration machine is provided with a coolant outlet, a coolant inlet, a spray water inlet and a spray water outlet; the coolant outlet is connected to the liquid inlet end of the coolant flow gap, the liquid outlet end of the coolant flow gap is connected to the coolant inlet, the spray water inlet is used to connect to a water source, and the spray water outlet is connected to the spray cooling mechanism.

[0012] In one of the embodiments, the tube wall of the flue gas discharge heat transfer pipe located in the waste heat exchange cavity protrudes in the radial direction to form a plurality of waste heat transfer convex pockets, and each of the waste heat transfer convex pockets is arranged at intervals along the axial direction of the flue gas discharge heat transfer pipe.

[0013] In one of the embodiments, the waste heat exchanger is coated with a thermal insulation layer.

[0014] In one of the embodiments, the liquid outlet end of the coolant flow gap and the liquid inlet end of the coolant flow gap are both arranged close to the side of the flue gas emission heat conduction pipe, the liquid inlet end of the coolant flow gap is close to the exhaust end of the flue gas emission heat conduction pipe, and the liquid outlet end of the coolant flow gap is close to the air inlet end of the flue gas emission heat conduction pipe.

[0015] In one embodiment, the spray cooling mechanism includes a connecting main pipe and a plurality of spray branch pipes, each of the spray branch pipes is arranged at the top end of the rotating cylinder and is arranged at intervals along the axial direction of the rotating cylinder; the spray water outlet is connected to the connecting main pipe, the connecting main pipe is arranged parallel to the axis of the rotating cylinder, each of the spray branch pipes is respectively connected to and perpendicular to the connecting main pipe, and each of the spray branch pipes has a plurality of spray holes spaced apart along the length direction.

[0016] In one of the embodiments, the material cooling kiln also includes a water collecting sleeve, which is arranged on the outside of the rotating cylinder, and a spray gap is provided between the water collecting sleeve and the rotating cylinder, and the spray cooling mechanism is arranged in the spray gap, and the water collecting sleeve forms an arc-shaped water collecting pool at the bottom end of the rotating cylinder; the two ends of the spray branch pipe extend in an arc shape along the contour of the rotating cylinder, and together with the arc-shaped water collecting pool, surround the outer periphery of the rotating cylinder, and the bottom of the arc-shaped water collecting pool is used to connect to a spray water recovery tank.

[0017] In one of the embodiments, the rotary kiln waste heat recovery refrigeration device also includes a bag dust collector, the air inlet end of the bag dust collector is connected to the higher end of the material calcining kiln, and the air outlet end of the bag dust collector is connected to the air inlet end of the flue gas exhaust heat transfer pipe.

[0018] In one embodiment, the material calcining kiln is vertically higher than the material cooling kiln, and the lower end of the material calcining kiln is connected to the higher end of the material cooling kiln through a vertical pipeline.

[0019] In one of the embodiments, the rotary kiln waste heat recovery refrigeration device further includes a centrifugal fan, and an air inlet of the centrifugal fan is opposite to the exhaust port.

[0020] A rotary kiln cooling system comprises the rotary kiln waste heat recovery refrigeration device of any of the above embodiments.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] 1) Because the air inlet end of the flue gas discharge heat conduction pipe is connected to the higher end of the material calcining kiln, the exhaust end of the flue gas discharge heat conduction pipe runs through the waste heat exchange cavity and extends outside the waste heat exchanger to form an exhaust port, so that the high-temperature flue gas in the material calcining kiln can be discharged through the exhaust port to accelerate heat dissipation, avoiding the temperature accumulation of the kiln wall of the material calcining kiln and improving the operating environment.

[0023] 2) Because there is a coolant flow gap between the outer wall of the flue gas discharge heat conduction pipe and the wall of the coolant heat exchange chamber, the high-temperature flue gas can transfer the waste heat to the coolant in the coolant flow gap through the wall of the flue gas discharge heat conduction pipe, thereby realizing heat exchange. With the discharge of high-temperature flue gas, the cooling of the material calcining kiln can be effectively accelerated, so that the material in the material calcining kiln can be cooled faster. When the material flows to the material cooling kiln, less cooling water is needed for material cooling, which reduces the waste of water resources and the amount of hot steam generated, and improves the operating environment.

[0024] 3) Because the waste heat driven adsorption refrigerator is connected to the liquid inlet of the coolant flow gap through the coolant outlet, and the liquid outlet of the coolant flow gap is connected to the liquid outlet of the coolant flow gap through the coolant inlet, the coolant can circulate between the coolant flow gap and the waste heat driven adsorption refrigerator to continuously transfer the waste heat to the waste heat driven adsorption refrigerator. The waste heat drives the waste heat driven adsorption refrigerator to perform refrigeration operations, and the spray water of the water source enters the waste heat driven adsorption refrigerator through the spray water inlet to be cooled, and flows to the spray cooling mechanism through the spray water outlet, and finally enables the spray cooling mechanism to spray spray water with a lower temperature to the material cooling kiln. The above-mentioned rotary kiln waste heat recovery refrigeration device is more energy-saving and environmentally friendly by recovering the waste heat of high-temperature flue gas for refrigeration. At the same time, the spray water after cooling further accelerates the cooling of the material calcining kiln, making the cooling efficiency of the material higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic structural diagram of a rotary kiln waste heat recovery refrigeration device according to an embodiment of the present disclosure;

[0027] Figure 2 for Figure 1 A partial schematic structural diagram of the installation state of the waste heat exchanger and the flue gas exhaust heat transfer pipe of the rotary kiln waste heat recovery refrigeration device shown;

[0028] Figure 3 for Figure 2 The sectional view of the waste heat exchanger of the rotary kiln waste heat recovery refrigeration device along A1-A2 shown;

[0029] Figure 4 for Figure 1 A partial top view of a material cooling kiln of a rotary kiln waste heat recovery refrigeration device shown;

[0030] Figure 5 for Figure 4 The cross-sectional view of the material cooling kiln of the rotary kiln waste heat recovery refrigeration device along B1-B2 shown;

[0031] Reference numerals: 10, rotary kiln waste heat recovery refrigeration device; 100, material calcining kiln; 200, material cooling kiln; 210, rotary cylinder; 220, spray cooling mechanism; 230, water collecting cylinder sleeve; 2310, arc-shaped water collecting pool; 2311, spray gap; 2210, connecting main pipe; 2220, spray branch pipe; 2221, spray hole; 300, waste heat exchanger; 310, waste heat exchange cavity; 320, insulation layer; 4 00, flue gas discharge heat conduction pipe; 410, exhaust port; 420, waste heat conduction cam; 500, waste heat driven adsorption refrigerator; 510, coolant outlet; 520, coolant flow gap; 530, coolant inlet; 5310, coolant storage tank; 540, spray water inlet; 550, spray water outlet; 600, spray water recovery tank; 700, bag filter; 800, vertical pipeline; 900, centrifugal fan. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0036] like Figure 1 and Figure 2As shown, a rotary kiln waste heat recovery refrigeration device 10 of an embodiment includes a material calcining kiln 100, a material cooling kiln 200, a waste heat exchanger 300, a flue gas discharge heat conduction pipe 400 and a waste heat driven adsorption refrigerator 500; the material calcining kiln 100 and the material cooling kiln 200 are arranged obliquely, and the lower end of the material calcining kiln 100 is connected to the higher end of the material cooling kiln 200; the material cooling kiln 200 includes a rotary cylinder 210 and a spray cooling mechanism 220, the spray cooling mechanism 220 is arranged on the outer side of the rotary cylinder 210, and a plurality of spray holes 2221 are opened toward the cylinder wall of the rotary cylinder 210; a waste heat exchange cavity 310 is opened in the waste heat exchanger 300, and the air inlet end of the flue gas discharge heat conduction pipe 400 is connected to At the higher end of the material calcining kiln 100, the exhaust end of the flue gas discharge heat conduction pipe 400 passes through the waste heat exchange chamber 310 and extends outside the waste heat exchanger 300 to form an exhaust port 410; a coolant flow gap 520 is formed between the outer wall of the flue gas discharge heat conduction pipe 400 and the cavity wall of the waste heat exchange chamber 310; a coolant outlet 510, a coolant inlet 530, a spray water inlet 540 and a spray water outlet 550 are provided on the waste heat driven adsorption refrigerator 500; the coolant outlet 510 is connected to the liquid inlet end of the coolant flow gap 520, the liquid outlet end of the coolant flow gap 520 is connected to the coolant inlet 530, the spray water inlet 540 is used to connect to the water source, and the spray water outlet 550 is connected to the spray cooling mechanism 220.

[0037] It can be understood that because the air inlet end of the flue gas emission heat pipe 400 is connected to the higher end of the material calcining kiln 100, the exhaust end of the flue gas emission heat pipe 400 passes through the waste heat exchange chamber 310 and extends outside the waste heat exchanger 300 to form an exhaust port 410, so that the high-temperature flue gas in the material calcining kiln 100 can be discharged through the exhaust port 410 to accelerate heat dissipation, thereby avoiding the temperature accumulation of the kiln wall of the material calcining kiln 100 and improving the operating environment.

[0038] It can be understood that, because a coolant flow gap 520 is formed between the outer wall of the flue gas discharge heat conduction pipe 400 and the cavity wall of the coolant heat exchange cavity, the high-temperature flue gas can transfer the waste heat to the coolant in the coolant flow gap 520 through the tube wall of the flue gas discharge heat conduction pipe 400, thereby realizing heat exchange. With the discharge of high-temperature flue gas, the cooling of the material calcining kiln 100 can be effectively accelerated, so that the material in the material calcining kiln 100 can be cooled faster. When the material flows to the material cooling kiln 200, less cooling water is required for material cooling, which reduces the waste of water resources and the amount of hot steam generated, and improves the operating environment.

[0039] It can be understood that because the waste heat driven adsorption refrigerator 500 is connected to the liquid inlet end of the coolant flow gap 520 through the coolant outlet 510, and the liquid outlet end of the coolant flow gap 520 is connected to the liquid outlet end of the coolant flow gap 520 through the coolant inlet 530, the coolant can circulate between the coolant flow gap 520 and the waste heat driven adsorption refrigerator 500 to continuously transfer the waste heat to the waste heat driven adsorption refrigerator 500, and the waste heat drives the waste heat driven adsorption refrigerator 500 to perform a refrigeration operation, and the spray water of the water source enters the waste heat driven adsorption refrigerator 500 through the spray water inlet 540 to be cooled, and flows to the spray cooling mechanism 220 through the spray water outlet 550, so that the spray cooling mechanism 220 can finally spray spray water with a lower temperature to the material cooling kiln 200. The above-mentioned rotary kiln waste heat recovery refrigeration device 10 is more energy-saving and environmentally friendly by recovering the waste heat of high-temperature flue gas for refrigeration. At the same time, the spray water after refrigeration further accelerates the cooling of the material calcining kiln 100, making the cooling efficiency of the material higher.

[0040] Combination Figure 2 and Figure 3 As shown, in one embodiment, the tube wall of the flue gas discharge heat conduction pipe 400 located in the waste heat exchange cavity 310 protrudes in the radial direction to form a plurality of waste heat conduction convex sacs 420, and each waste heat conduction convex sac 420 is arranged at intervals along the axial direction of the flue gas discharge heat conduction pipe 400. It can be understood that the tube wall of the flue gas discharge heat conduction pipe 400 located in the waste heat exchange cavity 310 protrudes in the radial direction, so that the flue gas discharge heat conduction pipe 400 forms a plurality of waste heat conduction convex sacs 420 in the waste heat exchange cavity 310, and each waste heat conduction convex sac 420 is arranged at intervals along the axial direction of the flue gas discharge heat conduction pipe 400. Because the waste heat conduction convex sac 420 has an olive-shaped inner cavity and a larger inner surface, it can increase the heat conduction area between the high-temperature flue gas and the waste heat conduction convex sac 420, so that the high-temperature flue gas can conduct more waste heat through the waste heat conduction convex sac 420, thereby improving the waste heat recovery efficiency. At the same time, the waste heat conduction sac 420 also has a larger outer surface, which can increase the heat transfer area between the waste heat conduction sac 420 and the coolant in the coolant flow gap 520, so that the coolant can more fully absorb the waste heat and reduce the waste of waste heat. Of course, the tube wall of the flue gas discharge heat transfer pipe 400 in the waste heat exchange cavity 310 can also be spiral, diamond, etc., which is not limited here, and those skilled in the art can also replace it as needed.

[0041] Combination Figure 3 As shown, further, the waste heat exchanger 300 is coated with a thermal insulation layer 320. It can be understood that by coating the waste heat exchanger 300 with the thermal insulation layer 320, the thermal insulation layer 320 can reduce the waste heat loss through the surface of the waste heat exchanger 300, so that the waste heat can be more absorbed by the coolant in the coolant flow gap 520, thereby improving the recovery rate of the waste heat.

[0042] Combination Figure 2 As shown, in one embodiment, the liquid outlet end of the coolant flow gap 520 and the liquid inlet end of the coolant flow gap 520 are both arranged close to the side of the flue gas discharge heat conduction pipe 400, the liquid inlet end of the coolant flow gap 520 is close to the exhaust end of the flue gas discharge heat conduction pipe 400, and the liquid outlet end of the coolant flow gap 520 is close to the air inlet end of the flue gas discharge heat conduction pipe 400. It can be understood that by setting the liquid inlet end of the coolant flow gap 520 close to the exhaust end of the flue gas discharge heat pipe 400, and setting the liquid outlet end of the coolant flow gap 520 close to the air inlet end of the flue gas discharge heat pipe 400, when the high-temperature flue gas flows to the exhaust end of the flue gas discharge heat pipe 400 through the air inlet end of the flue gas discharge heat pipe 400, the coolant simultaneously flows from the liquid inlet end of the coolant flow gap 520 to the liquid outlet end of the coolant flow gap 520, so that the flow direction of the high-temperature flue gas is opposite to the flow direction of the coolant, so that the coolant can always exchange heat with the higher temperature flue gas to increase its temperature during the flow process, and finally the coolant can be heated to a higher temperature. The higher temperature of the coolant can better drive the waste heat driven adsorption refrigerator 500 to refrigerate.

[0043] Combination Figure 4 and Figure 5As shown, in one embodiment, the spray cooling mechanism 220 includes a connecting main pipe 2210 and a plurality of spray branch pipes 2220, each spray branch pipe 2220 is arranged at the top end of the rotating cylinder 210 and is arranged at intervals along the axial direction of the rotating cylinder 210; the spray water outlet 550 is connected to the connecting main pipe 2210, the connecting main pipe 2210 is arranged parallel to the axis of the rotating cylinder 210, each spray branch pipe 2220 is respectively connected and perpendicular to the connecting main pipe 2210, and each spray branch pipe 2220 has a plurality of spray holes 2221 spaced apart along the length direction. It can be understood that each spray branch pipe 2220 is arranged at the top end of the rotating cylinder 210 and is arranged at intervals along the axial direction of the rotating cylinder 210, so that the spray branch pipes 2220 are evenly dispersed in the axial direction of the rotating cylinder 210, the spray branch pipes 2220 are perpendicular to the connecting main pipe 2210, and each spray branch pipe 2220 has a plurality of spray holes 2221 spaced apart along the length direction, so that the spray holes 2221 are dispersed in the radial direction of the rotating cylinder 210. The refrigerated spray water can be distributed to each spray branch pipe 2220 through the connecting main pipe 2210, and sprayed downward from the top part of the rotating cylinder 210 through the spray hole 2221 to cool the rotating cylinder 210. The spray water can be dispersed and sprayed on the entire top part of the rotating cylinder 210 through the spray cooling mechanism 220. The spray water will flow from the top to the bottom along the wall of the rotating cylinder 210 under the action of gravity, so that all parts of the rotating cylinder 210 can be sprayed with the spray water, further improving the spray cooling effect of the spray cooling mechanism 220, thereby accelerating the cooling of the material in the rotating cylinder 210.

[0044] Combination Figure 1 and Figure 5 As shown, in one embodiment, the material cooling kiln 200 also includes a water collecting sleeve 230, which is sleeved on the outside of the rotating cylinder 210, and a spray gap 2311 is provided between the water collecting sleeve 230 and the rotating cylinder 210, and the spray cooling mechanism 220 is arranged in the spray gap 2311, and the water collecting sleeve 230 forms an arc-shaped water collecting pool 2310 at the bottom end of the rotating cylinder 210; both ends of the spray branch pipe 2220 extend in an arc shape along the contour of the rotating cylinder 210, and together with the arc-shaped water collecting pool 2310 surround the outer periphery of the rotating cylinder 210, and the bottom of the arc-shaped water collecting pool 2310 is used to connect to the spray water recovery tank 600.

[0045] It can be understood that by arranging a water collecting sleeve on the outside of the rotating cylinder 210 and by setting the spray cooling mechanism 220 in the spray gap 2311 between the water collecting sleeve 230 and the rotating cylinder 210, the spray water sprayed by the spray mechanism can be collected to avoid leakage and waste of the spray water.

[0046] It can be understood that because the water collecting sleeve 230 forms an arc-shaped water collecting pool 2310 at the bottom end of the rotating cylinder 210, the spray branch pipe 2220 is located at the top end of the rotating cylinder 210, and the spray branch pipe 2220 and the arc-shaped water collecting pool 2310 together surround the outer periphery of the rotating cylinder 210, the spray water sprayed by the spray branch pipe 2220 will be gathered at the bottom of the arc-shaped water collecting pool 2310 and recovered to the spray water recovery tank 600. The recovered spray water can be used for a second time, further improving the utilization rate of the spray water and saving water resources.

[0047] Combination Figure 1 As shown, in one embodiment, the rotary kiln waste heat recovery refrigeration device 10 further includes a bag filter 700, the air inlet end of the bag filter 700 is connected to the higher end of the material calcining kiln 100, and the air outlet end of the bag filter 700 is connected to the air inlet end of the flue gas discharge heat conduction pipe 400. It can be understood that the high-temperature flue gas first passes through the bag filter 700 and is discharged through the flue gas discharge heat conduction pipe 400. The bag filter 700 can adsorb particulate matter carried in the high-temperature flue gas to prevent the particulate matter from diffusing into the atmosphere to pollute the environment.

[0048] Combination Figure 1 As shown, in one embodiment, the material calcining kiln 100 is higher than the material cooling kiln 200 in the vertical direction, and the lower end of the material calcining kiln 100 is connected to the higher end of the material cooling kiln 200 through a vertical pipe 800. It can be understood that because the material calcining kiln 100 is higher than the material cooling kiln 200 in the vertical direction, the material calcining kiln 100 and the material cooling kiln 200 are separated by a certain distance in the vertical direction, which reduces the influence of the temperature of the material calcining kiln 100 on the material cooling kiln 200. At the same time, the lower end of the material calcining kiln 100 is connected to the higher end of the material cooling kiln 200 through the vertical pipe 800, so that the material in the material calcining kiln 100 will be moved to the material cooling kiln 200 through the vertical pipe 800 along the inclined direction under the action of gravity during the rotation of the material calcining kiln 100, which can make the material calcining operation and the material cooling operation more connected, saving production time.

[0049] Combination Figure 1 As shown, in one embodiment, the rotary kiln waste heat recovery refrigeration device 10 further includes a centrifugal fan 900, and the air inlet of the centrifugal fan 900 is opposite to the exhaust port 410. It can be understood that by arranging the air inlet of the centrifugal fan 900 and the exhaust port 410 of the flue gas discharge heat conduction pipe 400 opposite to each other, the high-temperature flue gas can be discharged from the exhaust port 410 at an accelerated speed under the action of the centrifugal fan 900, thereby accelerating the exhaust efficiency of the high-temperature flue gas, and thus making the temperature of the material in the material calcining kiln 100 drop faster.

[0050] Combination Figure 1As shown, in one embodiment, the rotary kiln waste heat recovery refrigeration device 10 further includes a coolant storage tank 5310, which is respectively connected to the liquid outlet of the coolant flow gap 520 and the coolant inlet 530 of the waste heat driven adsorption refrigerator 500. It can be understood that a large amount of additional coolant can be stored in the coolant storage tank 5310, and the coolant between the waste heat driven adsorption refrigerator 500 and the coolant flow gap 520 can be replenished in time to ensure that the heat exchange process proceeds smoothly.

[0051] The present disclosure also provides a rotary kiln cooling system, including the rotary kiln waste heat recovery refrigeration device 10 of any of the above embodiments. It can be understood that by applying the rotary kiln waste heat recovery refrigeration device 10 of the present disclosure to the rotary kiln cooling system, the refrigeration of the spray water by recovering the waste heat of the high-temperature flue gas can be more energy-saving and environmentally friendly, and the refrigerated spray water further accelerates the cooling of the material calcining kiln 100, so that the cooling efficiency of the material is higher.

[0052] In one embodiment, for better understanding, the working process of the rotary kiln waste heat recovery refrigeration device 10 of the above embodiment is described as follows:

[0053] After the material is calcined in the material calcining kiln 100, the material rotates and rolls with the material calcining kiln 100, and at the same time, it moves to the material cooling kiln 200 in an inclined direction under the action of gravity, and the high-temperature flue gas in the material calcining kiln 100 is discharged through the exhaust port 410. When the high-temperature flue gas passes through the waste heat exchanger 300, the waste heat of the high-temperature flue gas will be transferred to the coolant in the coolant flow gap 520, and the coolant will carry the waste heat to the waste heat driven adsorption refrigerator 500. The waste heat drives the waste heat driven adsorption refrigerator 500 to cool the spray liquid. The cooled spray liquid is sprayed onto the surface of the rotating cylinder 210 through the spray cooling mechanism 220 to cool the rotating cylinder 210, thereby accelerating the cooling of the material in the rotating cylinder 210.

[0054] Compared with the prior art, the present invention has at least the following advantages:

[0055] 1) Because the air inlet end of the flue gas discharge heat conduction pipe 400 is connected to the higher end of the material calcining kiln 100, the exhaust end of the flue gas discharge heat conduction pipe 400 passes through the waste heat exchange chamber 310 and extends to the outside of the waste heat exchanger 300 to form an exhaust port 410, so that the high-temperature flue gas in the material calcining kiln 100 can be discharged through the exhaust port 410 to accelerate heat dissipation, thereby avoiding the temperature accumulation of the kiln wall of the material calcining kiln 100 and improving the operating environment.

[0056] 2) Because a coolant flow gap 520 is formed between the outer wall of the flue gas discharge heat conduction pipe 400 and the wall of the coolant heat exchange chamber, the high-temperature flue gas can transfer the waste heat to the coolant in the coolant flow gap 520 through the wall of the flue gas discharge heat conduction pipe 400, thereby realizing heat exchange. With the discharge of high-temperature flue gas, the cooling of the material calcining kiln 100 can be effectively accelerated, so that the material in the material calcining kiln 100 can be cooled faster. When the material flows to the material cooling kiln 200, less cooling water is needed for material cooling, which reduces the waste of water resources and the amount of hot steam generated, and improves the operating environment.

[0057] 3) Because the waste heat driven adsorption refrigerator 500 is connected to the liquid inlet end of the coolant flow gap 520 through the coolant outlet 510, and the liquid outlet end of the coolant flow gap 520 is connected to the liquid outlet end of the coolant flow gap 520 through the coolant inlet 530, the coolant can circulate between the coolant flow gap 520 and the waste heat driven adsorption refrigerator 500 to continuously transfer the waste heat to the waste heat driven adsorption refrigerator 500, and the waste heat drives the waste heat driven adsorption refrigerator 500 to perform a refrigeration operation, and the spray water of the water source enters the waste heat driven adsorption refrigerator 500 through the spray water inlet 540 to be cooled, and flows to the spray cooling mechanism 220 through the spray water outlet 550, so that the spray cooling mechanism 220 can finally spray spray water with a lower temperature to the material cooling kiln 200. The above-mentioned rotary kiln waste heat recovery refrigeration device 10 is more energy-saving and environmentally friendly by recovering the waste heat of high-temperature flue gas for refrigeration. At the same time, the spray water after refrigeration further accelerates the cooling of the material calcining kiln 100, making the cooling efficiency of the material higher.

[0058] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be based on the attached claims.

Claims

1. A rotary kiln waste heat recovery refrigeration device (10), comprising a material calcining kiln (100) and a material cooling kiln (200) arranged at an angle, wherein the lower end of the material calcining kiln (100) is connected to the higher end of the material cooling kiln (200); the material cooling kiln (200) comprises a rotary cylinder (210) and a spray cooling mechanism (220), wherein the spray cooling mechanism (220) is arranged on the outer side of the rotary cylinder (210), and a plurality of spray holes (2221) are opened toward the cylinder wall of the rotary cylinder (210); It is characterized in that The rotary kiln waste heat recovery refrigeration device (10) further comprises a waste heat heat exchanger (300), a flue gas discharge heat conducting pipe (400) and a waste heat driven adsorption refrigerator (500); A waste heat exchange cavity (310) is provided in the waste heat exchanger (300); an air inlet end of the flue gas discharge heat conduction pipe (400) is connected to a higher end of the material calcining kiln (100); an exhaust end of the flue gas discharge heat conduction pipe (400) passes through the waste heat exchange cavity (310) and extends outside the waste heat exchanger (300) to form an exhaust port (410); a coolant flow gap (520) is formed between the outer wall of the flue gas discharge heat conduction pipe (400) and the cavity wall of the waste heat exchange cavity (310); The waste heat driven adsorption refrigeration machine (500) is provided with a cooling liquid outlet (510), a cooling liquid inlet (530), a spray water inlet (540) and a spray water outlet (550); the cooling liquid outlet (510) is connected to the liquid inlet end of the cooling liquid flow gap (520), the liquid outlet end of the cooling liquid flow gap (520) is connected to the cooling liquid inlet (530), the spray water inlet (540) is used to connect to a water source, and the spray water outlet (550) is connected to the spray cooling mechanism (220).

2. The rotary kiln waste heat recovery refrigeration device (10) according to claim 1, characterized in that: The tube wall of the flue gas discharge heat conduction pipe (400) located in the waste heat exchange cavity (310) protrudes in the radial direction to form a plurality of waste heat conduction convex pockets (420), and each of the waste heat conduction convex pockets (420) is arranged at intervals along the axial direction of the flue gas discharge heat conduction pipe (400).

3. The rotary kiln waste heat recovery refrigeration device (10) according to claim 2, characterized in that: The waste heat exchanger (300) is coated with a thermal insulation layer (320).

4. The rotary kiln waste heat recovery refrigeration device (10) according to claim 1, characterized in that: The liquid outlet end of the coolant flow gap (520) and the liquid inlet end of the coolant flow gap (520) are both arranged close to the side of the flue gas discharge heat conduction pipe (400), the liquid inlet end of the coolant flow gap (520) is close to the exhaust end of the flue gas discharge heat conduction pipe (400), and the liquid outlet end of the coolant flow gap (520) is close to the air inlet end of the flue gas discharge heat conduction pipe (400).

5. The rotary kiln waste heat recovery refrigeration device (10) according to claim 1, characterized in that: The spray cooling mechanism (220) comprises a connecting main pipe (2210) and a plurality of spray branch pipes (2220), each of the spray branch pipes (2220) being arranged at the top end of the rotating cylinder (210) and being arranged at intervals along the axial direction of the rotating cylinder (210); the spray water outlet (550) is connected to the connecting main pipe (2210), the connecting main pipe (2210) is arranged parallel to the axis of the rotating cylinder (210), each of the spray branch pipes (2220) is respectively connected to and perpendicular to the connecting main pipe (2210), and each of the spray branch pipes (2220) is provided with a plurality of spray holes (2221) spaced apart along the length direction.

6. The rotary kiln waste heat recovery refrigeration device (10) according to claim 5, characterized in that: The material cooling kiln (200) further comprises a water collecting sleeve (230), wherein the water collecting sleeve (230) is sleeved on the outside of the rotating cylinder (210), a spray gap (2311) is provided between the water collecting sleeve (230) and the rotating cylinder (210), the spray cooling mechanism (220) is arranged in the spray gap (2311), and the water collecting sleeve (230) forms an arc-shaped water collecting pool (2310) at the bottom end of the rotating cylinder (210); the two ends of the spray branch pipe (2220) extend in an arc shape along the contour of the rotating cylinder (210), and together with the arc-shaped water collecting pool (2310), surround the outer periphery of the rotating cylinder (210), and the bottom of the arc-shaped water collecting pool (2310) is used to connect to a spray water recovery tank (600).

7. The rotary kiln waste heat recovery refrigeration device (10) according to claim 1, characterized in that: The rotary kiln waste heat recovery refrigeration device (10) further comprises a bag filter (700), wherein an air inlet end of the bag filter (700) is connected to a higher end of the material calcining kiln (100), and an air outlet end of the bag filter (700) is connected to an air inlet end of the flue gas exhaust heat transfer pipe (400).

8. The rotary kiln waste heat recovery refrigeration device (10) according to claim 1, characterized in that: The material calcining kiln (100) is vertically higher than the material cooling kiln (200), and the lower end of the material calcining kiln (100) is connected to the higher end of the material cooling kiln (200) via a vertical pipe (800).

9. The rotary kiln waste heat recovery refrigeration device (10) according to claim 1, characterized in that: The rotary kiln waste heat recovery refrigeration device (10) further comprises a centrifugal fan (900), wherein an air inlet of the centrifugal fan (900) is opposite to the air outlet (410).

10. A rotary kiln cooling system, characterized in that: It comprises the rotary kiln waste heat recovery refrigeration device (10) according to any one of claims 1 to 9.

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