Rotary roller type multiphase heat exchange and reaction system and application thereof

Abstract

The invention relates to the technical field of fluid heat transfer, mechanical manufacturing, mineral processing and solid waste treatment, and discloses a rotary roller type multiphase heat exchange and reaction system and application thereof.The system comprises one or more independent reaction devices, and the devices are arranged in series through feeding and discharging pipelines; gas media and materials reversely run in the system through a feeding pipeline and a discharging pipeline, a horizontal material bed formed by one or more layers of rotating rollers with adjustable inclination angles is arranged in each device, particle materials are arranged on the horizontal material beds, dynamic screening, dynamic exchange of upper and lower layers of materials and efficient heat exchange can be conducted on the particle materials at the same time by means of the device, and therefore the particle materials can be effectively screened. Gaseous media with different properties and temperatures are introduced at the same time, convective heat exchange or chemical reaction between the gaseous media and solid particles is achieved, the speed of a material layer is gradually increased from bottom to top in the operation process, exchange of the upper material layer and the lower material layer is achieved, and the heat exchange efficiency or the reaction speed is improved by increasing contact between the particles and the gaseous media.

Description

Technical Field

[0001] The present invention relates to the technical fields of fluid heat transfer, mechanical manufacturing, mineral processing and solid waste treatment, and in particular to a rotating roller multiphase heat exchange and reaction system and application thereof. Background Art

[0002] The two-phase mass transfer and heat transfer between fluid and solid particles has always been a hot topic in the industrial field. How to improve the waste heat recovery efficiency in the industrial field, develop new heat exchange equipment, and improve the mass-heat transfer method are the restrictive links that need to be overcome urgently. The existing gas-solid two-phase heat exchange or reaction devices mainly include fluidized beds, vertical fixed beds, belt coolers, etc. Among them, fluidized beds are mainly used for heat exchange or chemical reactions of powders with a smaller particle size range, and the parameters need to be strictly controlled during the operation process, otherwise it will cause flow loss; the particles in the vertical fixed bed fall slowly during the operation process, and the distribution parameters need to be strictly controlled, otherwise it will cause uneven airflow distribution during the operation process, and the heat exchange or reaction efficiency will be low. During the operation of the belt cooler, the particle material is in a static state, but the operation process is subject to the problem of material layer height and particle size segregation along the width of the trolley. There are also problems such as low heat exchange efficiency caused by uneven airflow distribution in the vertical fixed bed. Summary of the invention

[0003] The purpose of the present invention is to provide a rotating roller multiphase heat exchange and reaction system and its application. During the operation of the system, the particulate material is spread on a material bed with an adjustable inclination angle formed by multiple rotating rollers, and rolls under the friction between the rotating rollers and the particulate material. In this process, heat exchange or chemical reaction is carried out with the introduced gaseous medium. The outstanding advantage of this system is that the speed of the material layer gradually increases from bottom to top during operation, thereby realizing the exchange of upper and lower material layers. In this process, the thickness of the material layer can be controlled by controlling the material discharge speed, ensuring that the particulate material is always in a rolling state during operation, increasing the contact time and contact area with the gaseous medium, strengthening the mass-heat transmission process, and improving the heat exchange efficiency or reaction speed.

[0004] In order to achieve the above purpose, the technical solutions adopted are as follows:

[0005] In a first aspect, a rotating roller multiphase heat exchange and reaction system is provided, the system comprising one or more independent reaction devices with reaction and heat exchange functions, and when there are multiple reaction devices, the multiple reaction devices are arranged in series;

[0006] One or more rows of parallel material beds with adjustable inclination angles are arranged inside the reaction device, a gas medium inlet and a material outlet are arranged at the bottom of the reaction device, a gas medium outlet and a material discharge inlet are arranged at the top of the reaction device, separate sealing components are arranged corresponding to the material outlet and the material discharge inlet, and the airflow direction and the material running direction are parallel or reverse.

[0007] Preferably, in the above-mentioned rotating roller type multiphase heat exchange and reaction system, the parallel material bed includes a plurality of rotating rollers with adjustable inclination angles; the one or more rows of parallel material beds with adjustable inclination angles are used for screening, upper and lower layer exchange, heat exchange or reaction of particulate materials.

[0008] Preferably, in the above-mentioned rotating roller type multiphase heat exchange and reaction system, when there are multiple reaction devices, the multiple reaction devices are arranged in multiple rows in the vertical direction or in a step-by-step forward manner in the horizontal direction; the rotation speed of the rotating rollers in the same row inside each reaction device is the same, and the rotation speed of the rotating rollers in different rows is the same or different; the gap between two adjacent rotating rollers in the same row of rotating rollers can be dynamically adjusted during operation; the connecting pipe between two adjacent reaction devices and the material unloading inlet of the first reaction device located at the top and the material outlet of the reaction device located at the bottom have a maximum angle of 90° with the horizontal direction.

[0009] Preferably, in the above-mentioned rotating roller multiphase heat exchange and reaction system, the substances introduced into the material outlet and the gas medium inlet are cold granular material and hot gaseous medium, or hot granular material and cold gaseous medium; wherein, the cold granular material and the hot granular material can be bulk particles prepared from iron-containing materials, non-ferrous metal ores, non-metallic minerals or other substances, and the force range of the bulk particles is 0.2mm-100mm, and the hot gaseous medium and the cold gaseous medium are reducing, inert or oxidizing gases, and the temperature range is 25-1500°C.

[0010] Preferably, in the above-mentioned rotating roller multiphase heat exchange and reaction system, the gas medium passing through the gas medium inlet includes but is not limited to one or more of H2, CO, CO2, N2, Ar, O2; the atmosphere in the reaction device is slightly negative pressure or slightly positive pressure, and when a reduction reaction is carried out, the atmosphere in the reaction device is slightly negative pressure, and when an oxidation reaction is carried out, the atmosphere in the reaction device is slightly positive pressure.

[0011] Preferably, in the above-mentioned rotating roller type multiphase heat exchange and reaction system, the rotating roller is a solid roller or a hollow through-hole roller, air holes are arranged on the surface of the hollow through-hole roller, and through holes are provided at both ends of the hollow through-hole roller for passing gaseous medium.

[0012] Preferably, in the above-mentioned rotating roller multiphase heat exchange and reaction system, an insulation structure is arranged on the outside of the reaction device, and the insulation structure includes a steel shell, an insulation plate, a permanent layer, and a working layer connected in sequence from the outside to the inside; a continuous temperature measurement component is arranged in the working layer and the permanent layer.

[0013] In a second aspect, there is provided an application of the rotating roller multiphase heat exchange and reaction system as described above in a drying device for wet materials.

[0014] In a third aspect, there is provided an application of the rotating roller multiphase heat exchange and reaction system as described above in a gas-solid heat exchange device for high-temperature bulk materials.

[0015] In a fourth aspect, there is provided an application of the rotating roller multiphase heat exchange and reaction system as described above as a reaction device between reducing, inert or oxidizing gas and solid bulk material.

[0016] The beneficial effects of the present invention are:

[0017] The rotating roller multiphase heat exchange and reaction system provided by the present invention can be provided with a material bed with an adjustable inclination angle formed by one or more layers of rotating rollers as needed, and the granular material is arranged on the horizontal material bed. The device can be used to dynamically screen the granular material and efficiently exchange heat at the same time, and gaseous media of different properties can be introduced at the same time to realize convection heat exchange or chemical reaction between the gaseous medium and the solid granular material. The outstanding advantage of the device is that the speed of the material layer from bottom to top gradually increases during operation, thereby realizing the exchange of the upper and lower material layers, and improving the heat exchange efficiency or reaction speed by increasing the contact between the granular material and the gaseous medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural diagram showing a rotating roller multiphase heat exchange and reaction system according to an embodiment of the present invention when multiple reaction devices are arranged vertically.

[0019] Figure 2 A structural diagram showing a rotating roller multiphase heat exchange and reaction system according to an embodiment of the present invention when multiple reaction devices are arranged obliquely.

[0020] Figure 3 Shows Figure 1 A local enlarged schematic diagram of point I in the middle.

[0021] Reference numerals:

[0022] 100. Reaction device; 101. Gas medium inlet; 102. Gas medium outlet; 103. Material discharge inlet; 104. Material outlet; 105. Sealing assembly; 106. Feeder; 107. Receiver for bulk material under screen; 108. Parallel material bed; 1081. Rotating roller; 109. Weighing sensor; 110. Three-layer insulation structure; 111. Steel shell; 112. Insulation board; 113. Permanent layer; 114. Working layer. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] The specific implementation of the present invention is further described in detail below in conjunction with the drawings and examples.

[0025] The embodiment of the present invention provides a rotating roller multiphase heat exchange and reaction system such as Figure 1 As shown, the system includes one or more independent reaction devices 100 with reaction and heat exchange functions. Different reaction devices 100 are arranged in series, and one or more rows of parallel material beds 108 with adjustable inclination angles are arranged inside. A gas medium inlet 101 is arranged at the bottom of the reaction device 100, a gas medium outlet 102 and a material unloading inlet 103 are arranged at the top of the reaction device 100, and a material outlet 104 is arranged at the bottom of the reaction device 100. In addition, separate sealing components 105 are provided for the material unloading inlet 103 and the material outlet 104 to prevent the escape of gaseous media during the unloading and discharging processes, and the airflow direction and the material running direction can be parallel or reverse.

[0026] In this embodiment, when multiple reaction devices are provided, when multiple reaction devices 100 are arranged in series, their relative arrangement positions can be various. For example, Figure 1 The structure diagram shown is when multiple reaction devices are arranged vertically. Figure 2 The structure diagram shown is when multiple reaction devices are arranged obliquely. Figure 1 and Figure 2 As shown, the material feed inlet 103 of the top reaction device 100 is provided with a feeder 106, and a weighing sensor 109 is configured in the feeder 106 to ensure the material height in the feeder 106. The feeder 106 can be a hopper, and the material in the hopper enters the top reaction device 100 by gravity. The gas medium inlet 101 is connected to a gas source for gas intake, and the gas medium outlet 102 is used for gas outlet. Figure 1 and Figure 2In the illustrated structure, the direction of the airflow and the direction of the material movement are opposite; a screened bulk material receiver 107 is provided corresponding to the gas medium inlet 101, and the screened bulk material receiver 107 is used to receive the bulk material screened by the reaction device 100. The airflow introduced through the gas medium inlet 101 will form a slight positive / negative pressure inside the reaction device 100, and the gas discharged from the gas medium outlet 102 can be directly discharged or recycled. Among them, the recycling method can be, for example, using the gas discharged from the gas medium outlet 102 as the gas source of the gas medium inlet 101 to achieve recycling.

[0027] It should be noted that the slightly positive / negative pressure means that a slightly negative pressure or a slightly positive pressure can be formed, which is adjusted according to the type of reaction being performed. For example, when a reduction reaction is performed, the atmosphere in the reaction device is a slightly negative pressure, and when an oxidation reaction is performed, the atmosphere in the reaction device is a slightly positive pressure.

[0028] Exemplarily, the sealing component 105 is a fan, and the fan seals the material discharge inlet 103 and the material outlet 104 by airflow sealing. The airflow of the fan may be derived from the gas discharged from the gas medium outlet 102 .

[0029] In some embodiments, Figure 1 and Figure 2 As shown, each independent reaction device 100 uses a row of rotating rollers 1081 with adjustable inclination angles to form a parallel material bed 108 for screening and heat exchange. The parallel material bed 108 with adjustable inclination angles formed by a single row or multiple rows of rotating rollers 1081 can be used for screening, upper and lower layer exchange, heat exchange or reaction of particulate materials. The roller diameter, material, rotation speed, etc. can be adjusted according to the material to be processed, temperature and atmosphere. The roller can be made of steel, ceramic, and includes but is not limited to other materials that are resistant to high temperature, friction, and corrosion.

[0030] In some embodiments, the arrangement of the reaction devices 100 in the system can be a multi-row arrangement in the vertical direction, or a horizontal step-by-step arrangement; the rotation speed of the rotating rollers in the same row inside each device is the same, and the rotation speed of the rotating rollers in different rows can be the same or different; the gap between two adjacent rotating rollers can be dynamically adjusted during actual operation; the connecting pipe between two adjacent reaction devices and the central axis of the feed port of the first device at the top and the discharge port of the bottom device are at most 90° from the horizontal direction.

[0031] In some embodiments, the operation process of each reaction device 100 can be cold particulate material and hot gaseous medium, or hot particulate material and cold gaseous medium; the raw materials can be bulk particles prepared from iron-containing materials, non-ferrous metal ores, non-metallic minerals or other substances, and the particle size range is from 0.2mm-100mm; the gas medium can be reducing, inert or oxidizing, the temperature range can be from room temperature to 1500℃, and the flow rate can be adjusted according to the thickness of the material layer on the material bed.

[0032] In some embodiments, the system can realize the following functions: used as a drying device for wet materials, used as a gas-solid heat exchange device for high-temperature bulk materials, used as a reaction device between reducing, inert or oxidizing gas and solid bulk materials, such as reduction roasting, oxidation roasting or roasting reaction under protective atmosphere. The gas medium used includes but is not limited to H2, CO, CO2, N2, Ar, O2 and other gases with reducing, oxidizing or inert properties.

[0033] In some embodiments, the roller of the rotating roller 1081 can be a solid roller or a hollow through-hole structure. The surface of the hollow through-hole roller can be provided with air holes, and a gaseous medium can be introduced through both ends of the roller, and the gaseous medium flows out through the through holes inside the roller and the air holes on the surface, and the temperature of the gaseous medium is adjustable; it can be used for roller cooling and as a supplementary inlet for the gaseous medium.

[0034] In some embodiments, each reaction device adopts a three-layer insulation structure 110, which includes, from the outside to the inside, a steel shell 111, an insulation board 112, a permanent layer 113, and a working layer 114, wherein the working layer 114 ensures resistance to erosion by gaseous media and impact of particulate materials; a continuous temperature measurement system is set in the working layer 114 and the permanent layer 113 to realize the overall temperature measurement of the device, thereby regulating the distribution of particulate materials and airflow.

[0035] The system will be described in detail below with reference to three specific application examples.

[0036] Example 1:

[0037] The system is used to recover waste heat from hot agglomerates. The specific process is as follows: the hot agglomerates (temperature depends on actual production) are introduced into the reaction device from the upper discharge port through the unloading device. While discharging, the rotating rollers start to rotate rapidly. A total of 3 layers of rotating rollers are arranged. The speed of each layer of rotating rollers gradually decreases from top to bottom. The angle of each layer of rotating rollers is less than 45°, and the gap between two adjacent rotating rollers in each layer gradually decreases. The gap can be adjusted online. The reference speed during operation is 200 rpm for the top layer of rotating rollers, 150 rpm for the second layer, and 120 rpm for the third layer. The thickness of the material layer on the rotating rollers is controlled not to be higher than 400 mm. At the same time, room temperature air is introduced from the lower air inlet. The air countercurrently passes through the material layer, exchanges heat with the hot agglomerates, and recovers the sensible heat carried by the agglomerates. The cooled agglomerates enter the subsequent treatment process, and the heated air enters the subsequent waste heat boiler to produce steam.

[0038] Example 2:

[0039] The system is used to reduce, oxidize or roast the cold agglomerates in an inert atmosphere. The rotating roller is preferably made of ceramic. The specific process is as follows: the cold agglomerates (temperature depends on actual production) are introduced into the reaction device from the upper discharge port through the unloading device. The rotating roller starts to rotate rapidly while unloading. A total of 3 layers of rotating rollers are arranged. The speed of each layer of rotating rollers gradually decreases from top to bottom. The angle of each layer of rotating rollers is less than 25°, and the gap between two adjacent rotating rollers in each layer gradually decreases. The gap can be adjusted online. The reference speed during operation is 180 rpm for the top layer of rotating rollers, 150 rpm for the second layer, and 120 rpm for the third layer. The thickness of the material layer of the rotating rollers is controlled not to be higher than 400 mm. At the same time, the rotating rollers are rotated from the bottom to the bottom. A high-temperature reducing gas medium (H2, CO or a mixture of the two, the temperature selected in this example is 900°C), an oxidizing gas medium (hot air, the temperature selected in this example is 800°C) or an inert gas (Ar or N2, the temperature is not higher than 1500°C) is introduced into the air inlet. The gas medium passes through the material layer upward, and performs reduction or oxidation reaction while exchanging heat with the cold agglomerates, thereby achieving reduction or oxidation treatment of the agglomerates. Typical agglomerates are pelletized ore or natural lump ore made of iron ore powder, or cold consolidated agglomerates prepared from non-ferrous metal ores. The treated agglomerates are cooled and then enter mineral processing or other post-processing processes. The tail gas generated after the reaction is treated in turn through a waste heat boiler and a dust collector.

[0040] Example 3:

[0041] The system is used to dry the cold agglomerates. The rotating roller is preferably made of heat-resistant stainless steel or ceramic. The specific process is as follows: the cold agglomerates with a certain humidity (the temperature is determined according to actual production) are introduced into the reaction device from the upper discharge port through the unloading device. While the material is discharged, the rotating roller starts to rotate rapidly. In the preferred case, two independent reaction devices are set up, and 3 layers of rotating rollers are set inside each device. The two reaction devices are arranged in series. The speed of each layer of rotating rollers gradually decreases from top to bottom. The angle of each layer of rotating rollers is less than 25°, and the gap between two adjacent rotating rollers in each layer gradually decreases. The gap can be The line is adjusted. During operation, the reference speed is 200 rpm for the top layer of rotating roller, 150 rpm for the second layer, and 120 rpm for the third layer. The thickness of the material layer on the rotating roller is controlled to be no higher than 400 mm. At the same time, a hot gas medium (set to 750°C this time) is introduced through one end of the rotating roller. The gas medium escapes from the air holes on the surface of the rotating roller in the bottom reaction device, and passes through the high-temperature material layer to undergo heat exchange reaction with the hot agglomerates. The gas escapes from the gas outlet on the top of the bottom reaction device and enters the first reaction device above. Finally, it is discharged from the gas outlet of the first reaction device and enters the tail gas treatment device. This device can achieve rapid drying of the agglomerates, avoid the appearance of an over-wet layer during the drying process, and significantly improve the drying efficiency.

[0042] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A rotating roller multiphase heat exchange and reaction system, characterized in that: The system includes one or more independent reaction devices with reaction and heat exchange functions. When there are multiple reaction devices, the multiple reaction devices are arranged in series; One or more rows of parallel material beds with adjustable inclination angles are arranged inside the reaction device, a gas medium inlet and a material outlet are arranged at the bottom of the reaction device, a gas medium outlet and a material discharge inlet are arranged at the top of the reaction device, separate sealing components are arranged corresponding to the material outlet and the material discharge inlet, and the airflow direction and the material running direction are parallel or reverse.

2. The rotating roller multiphase heat exchange and reaction system according to claim 1, characterized in that: The parallel material bed comprises a plurality of rotating rollers with adjustable inclination angles; the one or more rows of parallel material beds with adjustable inclination angles are used for screening, upper and lower layer exchange, heat exchange or reaction of particulate materials.

3. The rotating roller multiphase heat exchange and reaction system according to claim 2, characterized in that: When there are multiple reaction devices, the multiple reaction devices are arranged in multiple rows in the vertical direction or in a step-by-step forward manner in the horizontal direction; the rotation speeds of the rotating rollers in the same row inside each reaction device are the same, and the rotation speeds of the rotating rollers in different rows are the same or different; the gap between two adjacent rotating rollers in the same row of rotating rollers can be dynamically adjusted during operation; the angle between the central axis of the connecting pipe between two adjacent reaction devices and the material unloading inlet of the first reaction device located at the top and the material outlet of the reaction device located at the bottom and the horizontal direction is at most 90°.

4. The rotating roller multiphase heat exchange and reaction system according to claim 1, characterized in that: The substances introduced into the material outlet and the gas medium inlet are cold granular material and hot gaseous medium, or hot granular material and cold gaseous medium; wherein, the cold granular material and the hot granular material can be bulk particles prepared from iron-containing materials, non-ferrous metal ores, non-metallic minerals or other substances, and the force range of the bulk particles is 0.2mm-100mm. The hot gaseous medium and the cold gaseous medium are reducing, inert or oxidizing gases, and the temperature range is 25-1500°C.

5. The rotating roller multiphase heat exchange and reaction system according to claim 1, characterized in that: The gas medium passing through the gas medium inlet includes but is not limited to one or more of H2, CO, CO2, N2, Ar, and O2; the atmosphere in the reaction device is a slightly negative pressure or a slightly positive pressure. When a reduction reaction is carried out, the atmosphere in the reaction device is a slightly negative pressure, and when an oxidation reaction is carried out, the atmosphere in the reaction device is a slightly positive pressure.

6. The rotating roller multiphase heat exchange and reaction system according to claim 2, characterized in that: The rotating roller is a solid roller or a hollow through-hole roller. Air holes are arranged on the surface of the hollow through-hole roller. Both ends of the hollow through-hole roller are provided with through holes for introducing gaseous medium.

7. The rotating roller multiphase heat exchange and reaction system according to claim 6, characterized in that: A heat preservation structure is arranged outside the reaction device, and the heat preservation structure comprises a steel shell, a heat insulation board, a permanent layer, and a working layer which are sequentially connected from the outside to the inside; a continuous temperature measurement component is arranged on the working layer and the permanent layer.

8. Use of the rotating roller multiphase heat exchange and reaction system according to any one of claims 1 to 7 as a drying device for wet materials.

9. Use of the rotating roller multiphase heat exchange and reaction system according to any one of claims 1 to 7 in a gas-solid heat exchange device for high-temperature bulk materials.

10. Use of the rotating roller multiphase heat exchange and reaction system according to any one of claims 1 to 7 as a reaction device between reducing, inert or oxidizing gas and solid bulk material.

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