Rotary kiln equipment and waste heat recovery device thereof

Abstract

The utility model discloses rotary kiln equipment and a waste heat recovery device thereof. The waste heat recovery device of the rotary kiln equipment comprises a heat absorption assembly, a reflection mechanism and a fixing mechanism. The heat absorption assembly comprises a heat absorption assembly body, a first main conveying pipeline and a second main conveying pipeline. The heat absorption assembly body comprises a plurality of heat absorption pipelines which are arranged in a bent mode. The heat absorption assembly body is arranged close to the outer wall of a rotary kiln body of rotary kiln equipment and can absorb heat of the outer wall of the rotary kiln body. The first end of each heat absorption pipeline is connected with the first main conveying pipeline, and the second end of each heat absorption pipeline is connected with the second main conveying pipeline. The first main conveying pipeline serves as a medium input pipeline, and the second main conveying pipeline serves as a medium output pipeline. According to the rotary kiln equipment and the waste heat recovery device thereof, heat energy of the rotary kiln can be recovered; the recycled energy is reused, the energy utilization benefit is remarkably improved, the production cost is saved, the energy consumption is reduced, and the carbon emission is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary kilns and relates to rotary kiln equipment, in particular to rotary kiln equipment and a residual heat recovery device. Background Art

[0002] The rotary kiln is a common equipment used in cement calcination, mineral roasting, garbage or hazardous waste incineration and other fields. The rotary kiln usually has a kiln head entrance and a kiln tail outlet. The materials usually enter through the kiln head entrance and are discharged through the kiln tail outlet. As the rotary kiln slowly rotates, various materials are subjected to high-temperature calcination and incineration processes in the kiln.

[0003] The layout of the rotary kiln usually has a certain slope, so that the internal materials will spontaneously move from the kiln head to the kiln tail and be discharged from the outlet as the kiln body rotates; in this process, the materials undergo various set process steps through the high temperature in the kiln. The rotary kiln body is divided by cross section and is usually composed of a carbon steel shell, insulation bricks, refractory bricks, etc. Due to the high temperature in the internal operation, the heat will pass through these structures and be transferred to the outermost layer of the rotary kiln; usually the operating temperature of the outermost carbon steel surface is around 200-300℃. According to relevant theories, it can be calculated that this part of unrecovered heat is quite objective, and directly discharging it into the atmosphere is a huge waste of energy, which is not in line with the dual carbon strategy encouraged by the country.

[0004] During the operation of the rotary kiln, if the working condition is not well controlled or the internal refractory bricks are severely worn, it is easy to cause high temperature of the outer wall, causing potential damage to the steel structure equipment body.

[0005] Some manufacturers usually use water spraying to cool down and recycle part of the hot water. However, this design has a large latent heat of water evaporation, and the recovered heat only accounts for a small part of the kiln body's heat release, so the efficiency is low.

[0006] Some other solutions use the solution of pre-embedded or welded heat exchange device on the outer wall of rotary kiln. This solution requires major modification of kiln body, increases the operating load of rotary kiln, and easily causes adverse effects on driving motor and kiln tail seal.

[0007] In view of this, there is an urgent need to design a heat recovery method for rotary kiln equipment so as to overcome at least part of the above-mentioned defects of the existing heat recovery method. Utility Model Content

[0008] The utility model provides a rotary kiln device and a waste heat recovery device, which can recover the heat energy of the rotary kiln, improve the energy utilization efficiency, save production costs, save energy consumption, and reduce carbon emissions.

[0009] In order to solve the above technical problems, according to one aspect of the utility model, the following technical solution is adopted:

[0010] A waste heat recovery device for rotary kiln equipment, the waste heat recovery device for rotary kiln equipment comprising: a heat absorption component, a reflection mechanism and a fixing mechanism;

[0011] The heat absorption component includes a heat absorption component body, a first main delivery pipeline and a second main delivery pipeline; the heat absorption component body includes a plurality of heat absorption pipelines, each of which is bent;

[0012] The heat absorbing component body is arranged close to the outer wall of the rotary kiln body of the rotary kiln equipment, and can absorb the heat of the outer wall of the rotary kiln body; the heat absorbing component body is arranged between the outer wall of the rotary kiln body of the rotary kiln equipment and the reflection mechanism, and the fixing mechanism fixes the heat absorbing component and the reflection mechanism;

[0013] The first end of each heat absorption pipeline is connected to the first main delivery pipeline, and the second end of each heat absorption pipeline is connected to the second main delivery pipeline;

[0014] The first main delivery pipeline is used as a medium input pipeline, and the second main delivery pipeline is used as a medium output pipeline; the medium is input through the first main delivery pipeline, flows through the corresponding heat absorption pipeline to absorb heat, and is output to the second main delivery pipeline.

[0015] As an implementation mode of the utility model, the reflection mechanism includes a plurality of reflection units, each of which is connected in sequence; the cross-section of each reflection unit is arc-shaped, and each reflection unit faces the corresponding heat absorption pipeline; the heat absorption pipeline uses the radiation principle to heat the medium in the pipe.

[0016] As an embodiment of the present utility model, the reflecting mechanism includes a reflecting metal layer and a heat insulating layer; the reflecting metal layer is arranged in the inner layer, close to the heat absorbing component body; the heat insulating layer is arranged in the outer layer, away from the heat absorbing component body.

[0017] As an implementation mode of the utility model, the fixing mechanism includes a bracket, a support member, a first elastic limiting mechanism, and a second elastic limiting mechanism; the support member is arranged based on the bracket, and the support member is used to fix the reflection mechanism;

[0018] One end of the first elastic limiting mechanism is connected to the bracket, and the other end is connected to the first main conveying pipeline; one end of the second elastic limiting mechanism is connected to the bracket, and the other end is connected to the second main conveying pipeline.

[0019] As an implementation mode of the utility model, each heat absorption pipeline is arranged at intervals.

[0020] As an implementation mode of the utility model, the heat absorption pipeline includes a metal tube and a full-band heat absorption material; the full-band heat absorption material is coated on the outside of the metal tube.

[0021] As an embodiment of the utility model, the full-band heat-absorbing material is a wide-area infrared band heat-absorbing material based on the principle of localized surface plasma resonance, which can produce a high-efficiency thermal effect with the main infrared band radiated by the rotary kiln, thereby effectively absorbing the radiated heat.

[0022] As an implementation mode of the utility model, each heat absorption pipeline is provided with a valve body and a sensing mechanism.

[0023] As an implementation manner of the present utility model, the first main delivery pipeline and / or the second main delivery pipeline is provided with a pump body.

[0024] According to another aspect of the utility model, the following technical solution is adopted: a rotary kiln equipment, the rotary kiln equipment includes the above-mentioned rotary kiln equipment waste heat recovery device.

[0025] The beneficial effects of the utility model are as follows: the rotary kiln equipment and the waste heat recovery device proposed by the utility model can recover the heat energy of the rotary kiln; the recovered energy is reused, which significantly improves the energy utilization efficiency, saves production costs, saves energy consumption, and reduces carbon emissions.

[0026] The waste heat recovery device of the utility model has no direct contact with the rotary kiln and has no mechanical performance influence on the normal operation of the rotary kiln; it is convenient to quickly transform the existing rotary kiln equipment, has low cost, and is very convenient to operate and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a waste heat recovery device for a rotary kiln equipment in one embodiment of the utility model.

[0028] Figure 2 It is a schematic structural diagram of a waste heat recovery device for a rotary kiln equipment in one embodiment of the utility model.

[0029] Figure 3 It is a schematic structural diagram of a heat absorption component in one embodiment of the utility model.

[0030] Figure 4 It is a structural schematic diagram of a reflection mechanism in one embodiment of the utility model.

[0031] Figure 5 It is a schematic diagram of the composition of the waste heat recovery system of the rotary kiln equipment in one embodiment of the utility model.

[0032] Figure 6 Schematic diagram of the relationship between the outer wall temperature of the rotary kiln and the infrared radiation wavelength in one embodiment of the utility model. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0034] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0035] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced and are also within the scope of the present invention.

[0036] The term “connection” in the specification includes both direct connection and indirect connection.

[0037] The utility model discloses a waste heat recovery device for rotary kiln equipment. Figure 1 , Figure 2 This is a schematic diagram of the structure of the waste heat recovery device of the rotary kiln equipment in one embodiment of the utility model; please refer to Figure 1 , Figure 2 The waste heat recovery device of the rotary kiln equipment includes: a heat absorption component, a reflection mechanism and a fixing mechanism. The heat absorption component includes a heat absorption component body 1, a first main delivery pipeline 2 and a second main delivery pipeline 3; the heat absorption component body 1 includes a plurality of heat absorption pipelines 4, each of which is bent. In one embodiment, the heat absorption pipelines 4 are arranged together to form the heat absorption component body 1.

[0038] The heat absorption component body 1 is arranged close to the outer wall of the rotary kiln body 5 of the rotary kiln equipment, and can absorb the heat of the outer wall of the rotary kiln body 5; the heat absorption component body 1 is arranged between the outer wall of the rotary kiln body 5 of the rotary kiln equipment and the reflection mechanism 6, and the fixing mechanism fixes the heat absorption component and the reflection mechanism 6.

[0039] The first end of each heat absorption pipeline 4 is connected to the first main delivery pipeline 2, and the second end of each heat absorption pipeline 4 is connected to the second main delivery pipeline 3; the first main delivery pipeline 2 is used as a medium input pipeline, and the second main delivery pipeline 3 is used as a medium output pipeline; the medium is input through the first main delivery pipeline 2 (which can be called an upper header), flows through the corresponding heat absorption pipeline 4 to absorb heat, and is output to the second main delivery pipeline 3 (which can be called a lower header). Each heat absorption pipeline 4 can also be provided with a valve body and a sensing mechanism; in addition, the first main delivery pipeline or / and the second main delivery pipeline are provided with a pump body.

[0040] Each heat absorption pipeline 4 can be arranged at intervals; in one embodiment, a plurality of metal pipes form a row of tube bundles, which are bent into an arc shape that conforms to the outer wall of the rotary kiln and arranged in parallel outside the rotary kiln. The structure of the above-mentioned heat absorption pipeline and the upper and lower headers can ensure the stability and uniformity of the medium flow; the total inlet and outlet of the header are equipped with pressure, temperature, flow and other instruments to monitor the efficiency of the entire heat absorption system. The medium circulates in the tube bundle through a circulation system, which is usually driven by a pump. The heated medium can be used directly for process purposes, or it can be heated by a heat exchanger.

[0041] In one embodiment of the present utility model, the fixing mechanism includes a bracket 7, a support member 8, a first elastic limiting mechanism 9, and a second elastic limiting mechanism 10; the support member 8 is arranged based on the bracket 7, and the support member 8 is used to fix the reflection mechanism 6;

[0042] One end of the first elastic limiting mechanism 9 is connected to the bracket 7 , and the other end is connected to the first main conveying pipeline 2 ; one end of the second elastic limiting mechanism 10 is connected to the bracket 7 , and the other end is connected to the second main conveying pipeline 3 .

[0043] Figure 3 This is a schematic diagram of the structure of the heat absorption component in one embodiment of the utility model; please refer to Figure 3 In one embodiment of the utility model, the heat absorption pipeline 4 includes a metal tube 41 and a full-band heat absorption material 42; the full-band heat absorption material 42 is coated on the outside of the metal tube 41.

[0044] Figure 6 FIG. 1 is a schematic diagram showing the relationship between the outer wall temperature of the rotary kiln and the infrared radiation wavelength in one embodiment of the present invention; Figure 6 It can be seen that the main energy wavelength of the outer wall of the rotary kiln is about 3-35um; in one embodiment of the utility model, the full-band heat-absorbing material is a wide-area infrared band heat-absorbing material based on the principle of localized surface plasmon resonance, which can produce a high-efficiency thermal effect with the main infrared band radiated by the rotary kiln, thereby effectively absorbing the radiated heat. In one embodiment, the radiation heat-absorbing material used in the utility model is manufactured based on the principle of localized surface plasmon resonance, and the heat absorption coefficient in the range of the rotary kiln radiation band is close to 1.0, which can maximize the use of radiation energy.

[0045] Figure 4 This is a schematic diagram of the structure of the reflection mechanism in one embodiment of the utility model; please refer to Figure 4In one embodiment of the utility model, the reflection mechanism 6 includes a plurality of reflection units 60, and each reflection unit 60 is connected in sequence; the cross-section of each reflection unit 60 is arc-shaped, and each reflection unit 60 faces the corresponding heat absorption pipeline 4; the heat absorption pipeline 4 uses the radiation principle to heat the medium in the pipe. The reflection mechanism 60 includes a reflection metal layer 61 and a heat insulation layer 62; the reflection metal layer 61 is arranged in the inner layer, close to the heat absorption component body 1; the heat insulation layer 62 is arranged in the outer layer, away from the heat absorption component body 1. In one embodiment, the surface of the reflection metal layer 61 is made of aluminum foil; according to the physical properties of the material, aluminum foil has a reflection efficiency of more than 95% for infrared rays in the 3-35um band, so the use of this material is very consistent with the required conditions of the utility model.

[0046] The reflection mechanism 6 may be a reflection cover, which may be a curved surface with an arc section (e.g., a part of the side surface of a cylinder). The reflection cover may be composed of aluminum foil and heat insulation cotton; the aluminum foil reflects the heat radiation leaking through the gap of the metal tube to the side of the metal tube facing away from the rotary kiln, thereby improving the heat absorption efficiency and making full use of the surface area of ​​the metal heat absorbing tube; the heat insulation cotton on the outside of the aluminum foil of the reflection cover prevents the heat in the system from escaping.

[0047] like Figure 1 , Figure 2 As shown, the rotary kiln body 5 can be arranged by a driving mechanism and a supporting mechanism; a driving wheel 21 is arranged outside the rotary kiln body 5, which can drive the rotary kiln body 5 to rotate. At least one supporting wheel retaining ring 22 can also be arranged outside the rotary kiln body 5, and each supporting wheel retaining ring 22 can cooperate with a corresponding supporting wheel 23; the supporting wheel 23 can be arranged based on a supporting base 24. One end of the rotary kiln body 5 is a feeding port 51, and the other end is a discharging port 52.

[0048] Figure 5 This is a schematic diagram of the composition of the waste heat recovery system of the rotary kiln equipment in one embodiment of the utility model; please refer to Figure 5 In one embodiment of the utility model, the waste heat recovery device of the rotary kiln equipment of the utility model is applied to the waste heat recovery system of the rotary kiln equipment; the waste heat recovery system of the rotary kiln equipment includes: a second-stage heat absorption device assembly 11, a first-stage heat absorption device assembly 12, a system water supply tank 13, a gas-liquid separation container 14, a booster pump 15, a heat exchanger 16, a gas-liquid separation container level control circuit 17, a second-stage heating flow 18, a system pressure control circuit 19 and a water supply control circuit 20.

[0049] The system water replenishment tank 13 is respectively connected to the water replenishment control circuit 20, the booster pump 15 and the heat exchanger 16; the booster pump 15 is respectively connected to the heat exchanger 16 and the gas-liquid separation container 14. The first end of the heat exchanger 16 is connected to the gas-liquid separation container 14 through the first stage heat absorption device assembly 12; the second end of the heat exchanger 16 is connected to the gas-liquid separation container 14 through the first pipeline, and the second end of the heat exchanger 16 is also connected to the gas-liquid separation container 14 through the gas-liquid separation container liquid level control circuit 17. The gas-liquid separation container 14 is connected to the second stage heat absorption device assembly 11 through the second stage heating flow 18.

[0050] In this embodiment, the heating system adopts a two-stage design; the first stage heat absorption device assembly 12 heats saturated water into saturated water or a steam-water mixture, and the second stage heat absorption device assembly 11 heats saturated steam into superheated steam; the system pressure is automatically controlled by the booster pump 15. The heated superheated steam is used as a medium carrier for waste heat recovery and is transported to the equipment that needs to use heat.

[0051] In one embodiment of the present invention, the product preparation process is as follows:

[0052] The metal heat-absorbing tubes are pre-bent into corresponding arcs and welded into parallel tube bundles with the assistance of brackets; each tube is then welded to the header; after the corresponding welding work is completed, each tube is coated with special heat-absorbing materials.

[0053] Stick the reflective aluminum foil on the insulation cotton (or directly use a complete set of products), bond the reflective material / insulation material to the prefabricated curved plate, and bend the local surface into a certain arc to match the installation size of the heat-absorbing tube bundle; the reflective aluminum foil, insulation material, supporting prefabricated plate and other components together constitute the reflective insulation component.

[0054] The heat absorption pipe assembly and the reflective insulation assembly are fixed together on a special bracket, and the fixing position and angle are matched with the rotary kiln. The stress points of the heat absorption pipe assembly are set on the upper and lower headers, and elastic supports are set to allow the structure to move horizontally and vertically after thermal expansion. Due to different expansion rates, the reflective insulation assembly is not directly connected to the heat absorption pipe assembly.

[0055] Install inlet and outlet manifolds on the header, and install valves, instruments (pressure / temperature / flow) and other equipment on the manifolds. If the medium is internally circulated, a heat exchanger should be configured in the pipeline system; if necessary, a gas-liquid separator should also be configured to separate the media in different heating sections to optimize the heating effect.

[0056] The system is equipped with an emergency shut-off valve to perform emergency release in the event of partial or overall control component failure or ineffectiveness to ensure system safety. All equipment in the entire system does not contain materials with a flash point below 300°C, so after the heat exchange medium is completely discharged, it will not spontaneously combust due to heating by the rotary kiln.

[0057] This system can also be equipped with infrared monitoring equipment to ensure that the rotary kiln body and related equipment do not have the risk of overheating. The original infrared monitoring and alarm device of the rotary kiln can be used in conjunction with this system.

[0058] The utility model further discloses a rotary kiln equipment, and the rotary kiln equipment comprises the above-mentioned rotary kiln equipment waste heat recovery device.

[0059] In summary, the rotary kiln equipment and the waste heat recovery device proposed in the utility model can recover the heat energy of the rotary kiln; the recovered energy is reused, which significantly improves the energy utilization efficiency, saves production costs, saves energy consumption, and reduces carbon emissions.

[0060] The waste heat recovery device of the utility model has no direct contact with the rotary kiln and has no mechanical performance influence on the normal operation of the rotary kiln; it is convenient to quickly transform the existing rotary kiln equipment, has low cost, and is very convenient to operate and maintain.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The description and application of the utility model here are illustrative, and it is not intended to limit the scope of the utility model to the above-mentioned embodiments. The effects or advantages involved in the embodiments may not be embodied in the embodiments due to interference from various factors, and the description of the effects or advantages is not used to limit the embodiments. The deformation and changes of the embodiments disclosed here are possible, and the replacement of the embodiments and the various equivalent components are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the utility model can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential features of the utility model. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the utility model.

Claims

1. A waste heat recovery device for rotary kiln equipment, characterized in that: The waste heat recovery device of the rotary kiln equipment comprises: a heat absorption component, a reflection mechanism and a fixing mechanism; The heat absorption component includes a heat absorption component body, a first main delivery pipeline and a second main delivery pipeline; the heat absorption component body includes a plurality of heat absorption pipelines, each of which is bent; The heat absorbing component body is arranged close to the outer wall of the rotary kiln body of the rotary kiln equipment, and can absorb the heat of the outer wall of the rotary kiln body; the heat absorbing component body is arranged between the outer wall of the rotary kiln body of the rotary kiln equipment and the reflection mechanism, and the fixing mechanism fixes the heat absorbing component and the reflection mechanism; The first end of each heat absorption pipeline is connected to the first main delivery pipeline, and the second end of each heat absorption pipeline is connected to the second main delivery pipeline; The first main delivery pipeline is used as a medium input pipeline, and the second main delivery pipeline is used as a medium output pipeline; the medium is input through the first main delivery pipeline, flows through the corresponding heat absorption pipeline to absorb heat, and is output to the second main delivery pipeline.

2. The waste heat recovery device for rotary kiln equipment according to claim 1, characterized in that: The reflection mechanism comprises a plurality of reflection units, each of which is connected in sequence; the cross section of each reflection unit is arc-shaped, and each reflection unit faces a corresponding heat absorption pipeline; the heat absorption pipeline heats the medium in the pipeline by adopting the radiation principle.

3. The waste heat recovery device for rotary kiln equipment according to claim 1, characterized in that: The reflective mechanism includes a reflective metal layer and a heat-insulating layer; the reflective metal layer is arranged in the inner layer, close to the heat-absorbing component body; the heat-insulating layer is arranged in the outer layer, away from the heat-absorbing component body.

4. The waste heat recovery device for rotary kiln equipment according to claim 1, characterized in that: The fixing mechanism comprises a bracket, a support member, a first elastic limiting mechanism, and a second elastic limiting mechanism; the support member is arranged based on the bracket, and the support member is used to fix the reflecting mechanism; One end of the first elastic limiting mechanism is connected to the bracket, and the other end is connected to the first main conveying pipeline; one end of the second elastic limiting mechanism is connected to the bracket, and the other end is connected to the second main conveying pipeline.

5. The waste heat recovery device for rotary kiln equipment according to claim 1, characterized in that: Each heat absorption pipeline is arranged at intervals.

6. The waste heat recovery device for rotary kiln equipment according to claim 1, characterized in that: The heat absorption pipeline includes a metal pipe and a full-band heat absorption material; the full-band heat absorption material is coated on the outside of the metal pipe.

7. The waste heat recovery device for rotary kiln equipment according to claim 6, characterized in that: The full-band heat-absorbing material is a wide-area infrared band heat-absorbing material based on the principle of localized surface plasma resonance, and can produce a high-efficiency thermal effect with the main infrared band radiated by the rotary kiln, thereby effectively absorbing the radiated heat.

8. The waste heat recovery device for rotary kiln equipment according to claim 1, characterized in that: Each heat absorption pipeline is provided with a valve body and a sensing mechanism.

9. The waste heat recovery device for rotary kiln equipment according to claim 1, characterized in that: The first main delivery pipeline and / or the second main delivery pipeline is provided with a pump body.

10. A rotary kiln device, characterized in that: The rotary kiln equipment comprises the rotary kiln equipment waste heat recovery device as described in any one of claims 1 to 9.

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