Cobalt hydroxide flash drying equipment and method thereof

Abstract

The invention discloses cobalt hydroxide flash drying equipment and a method thereof.The cobalt hydroxide flash drying equipment comprises a heat collector, a circulating pump, an oil-air heat exchanger, a first hot air duct, a hot air furnace, a fan, an oil storage tank, a combustor, a flash drying tower and a second hot air duct; the heat collector, the circulating pump and a first cavity in the oil-air heat exchanger are connected in series to form a circulating loop, an air inlet is formed in the hot blast stove, the first hot air duct is communicated with the air inlet, a second cavity of the oil-air heat exchanger is located in the first hot air duct, and the fan is used for blowing hot air in the first hot air duct into the hot blast stove. The oil storage tank, the combustor and the hot-blast stove are sequentially connected in series, the combustor is used for igniting fuel oil entering the hot-blast stove, and the flash drying tower is communicated with an air outlet of the hot-blast stove through a second hot air duct. The cobalt hydroxide flash drying equipment provided by the invention has the advantages of high photo-thermal utilization efficiency, low drying cost of cobalt hydroxide and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, and in particular to cobalt hydroxide flash drying equipment and a method thereof. Background Art

[0002] The magnesium oxide cobalt precipitation process is currently the main process for crude cobalt hydroxide. The process flow is: impurity removal-first stage cobalt precipitation-second stage cobalt precipitation-filtration and washing-flash drying-high-grade crude cobalt hydroxide product. At present, in the flash drying process, hot air furnaces are usually used to provide heat for flash drying. The fuel of the hot air furnace is fossil fuels such as diesel or natural gas, which is neither economical nor environmentally friendly. If the project area is rich in solar energy resources, solar thermal energy can be collected and used in the flash drying process, which will produce significant economic and environmental benefits. However, the energy source of photothermal technology is solar energy. When there is no continuous light, the entire system cannot be used, affecting process production. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a cobalt hydroxide flash drying device, which has the advantages of high light and heat utilization efficiency, low drying cost of cobalt hydroxide, and high efficiency.

[0005] The embodiment of the present invention also provides a flash drying method for cobalt hydroxide.

[0006] The cobalt hydroxide flash drying equipment of the embodiment of the present invention includes a heat collector, a circulation pump, an oil-air heat exchanger, a first hot air duct, a hot air stove, a fan, an oil storage tank, a burner, a flash drying tower and a second hot air duct, wherein the heat collector, the circulation pump and the first chamber in the oil-air heat exchanger are connected in series to form a circulation loop; an air inlet is provided on the hot air stove, the first hot air duct is connected to the air inlet, the second chamber of the oil-air heat exchanger is located in the first hot air duct, and the fan is used to blow the hot air in the first hot air duct into the hot air stove; the oil storage tank, the burner and the hot air stove are connected in series in sequence, and the burner is used to ignite the fuel entering the hot air stove; the flash drying tower is connected to the air outlet of the hot air stove through the second hot air duct.

[0007] According to the cobalt hydroxide flash drying equipment of the embodiment of the present invention, by connecting the heat collector, the circulation pump and the first chamber in the oil-air heat exchanger in series and forming a circulation loop, under sunlight radiation, the heat collector can heat the internal heat-conducting oil, and the heated heat-conducting oil is driven to the first chamber in the oil-air heat exchanger under the drive of the circulation pump to exchange heat with the air in the second chamber, and the heated hot air in the second chamber enters the hot air furnace from the first hot air duct under the blowing of the fan, and finally enters the flash drying tower from the hot air furnace to realize the drying of cobalt hydroxide. Among them, when the hot air temperature in the hot air furnace does not meet the drying requirements of cobalt hydroxide, the burner can be turned on, and the burner transports the fuel in the oil storage tank to the hot air furnace and ignites it to achieve the heating of the hot air, ensuring that the hot air finally entering the flash drying tower is within the set temperature range. Thus, solar energy is effectively utilized, the utilization rate of light energy is improved, the drying cost of cobalt hydroxide is reduced, and the drying efficiency of cobalt hydroxide is also guaranteed.

[0008] In some embodiments, the cobalt hydroxide flash drying equipment further comprises:

[0009] a first switch valve, wherein the first switch valve is installed on the circulation loop;

[0010] a second switch valve and a thermal oil expansion tank, wherein the second switch valve and the thermal oil expansion valve are connected in series and in parallel with the first switch valve;

[0011] A nitrogen tank is connected to the thermal oil expansion tank.

[0012] In some embodiments, the cobalt hydroxide flash drying equipment further comprises:

[0013] an oil-salt heat exchanger, wherein a first chamber of the oil-salt heat exchanger is connected in parallel with the collector;

[0014] A cold salt tank and a hot salt tank, wherein the cold salt tank, the second chamber of the oil-salt heat exchanger and the hot salt tank are sequentially connected in series.

[0015] In some embodiments, there are two air inlets and they are symmetrically arranged on both sides of the hot air stove;

[0016] The first hot air duct includes a first air duct and two second air ducts, the second chamber of the oil-air heat exchanger is located in the first air duct, the first end of the first air duct is connected with the first ends of the two second air ducts, the second ends of the two second air ducts are respectively connected with the two air inlets, an inspection port is provided on the peripheral wall of the second air duct, and a blocking plate capable of blocking the inspection port is installed on the second air duct.

[0017] In some embodiments, at least two oil-air heat exchangers are connected in series on the circulation loop, each oil-air heat exchanger is connected in parallel with a bypass pipeline, and each bypass pipeline is installed with a third switch valve;

[0018] Each of the oil-air heat exchangers corresponds to a group of the hot air furnace and the flash drying tower.

[0019] In some embodiments, a parabolic trough reflector or a linear Fresnel reflector is provided on the side of the collector;

[0020] The collector comprises a plurality of groups of vacuum heat collecting tubes connected in parallel, and each group of the vacuum heat collecting tubes comprises a plurality of vacuum heat collecting tubes connected in series.

[0021] In some embodiments, a first temperature sensor is installed on the circulation loop;

[0022] And / or, a second temperature sensor is provided on the first hot air duct;

[0023] And / or, a third temperature sensor is provided on the second hot air duct.

[0024] The flash drying method of cobalt hydroxide according to an embodiment of the present invention comprises the following steps:

[0025] The heat collector is radiated by the sun to heat the heat transfer oil in the circulation loop, and the circulation pump works to make the heat transfer oil in the circulation loop exchange heat with the air in the first hot air duct through the oil-air heat exchanger;

[0026] Starting the fan to blow the heated air in the first hot air duct into the hot air furnace, and adjusting the temperature of the air entering the hot air furnace by controlling the wind force;

[0027] The hot air in the hot air furnace enters the flash drying tower through the second hot air duct for drying operation;

[0028] The hot air temperature in the second hot air duct is detected. If the minimum set temperature is reached, the burner will not be started, and the temperature will be controlled within the set temperature range through the fan. If the minimum set temperature is not reached, the burner will be started to ignite the fuel entering the hot air furnace from the oil storage tank, and the hot air in the second hot air duct will be adjusted to the set temperature range.

[0029] The technical advantages of the cobalt hydroxide flash drying method according to the embodiment of the present invention are the same as the technical advantages of the cobalt hydroxide flash drying equipment in the above embodiment, which will not be repeated here.

[0030] In some embodiments, before starting the fan to blow the heated air in the first hot air duct into the hot air furnace and adjusting the temperature of the air entering the hot air furnace by controlling the wind force, the method further includes:

[0031] The circulation pump adjusts the flow rate according to the temperature of the heat transfer oil in the circulation loop to ensure that the heat transfer oil in the circulation loop always reaches the set temperature range;

[0032] When the temperature of the heat transfer oil in the circulation loop reaches the maximum set temperature, the heat transfer oil is heat exchanged with the molten salt through the oil-salt heat exchanger to store the heat energy in the hot salt tank.

[0033] In some embodiments, before the heat collector is subjected to solar radiation to heat the heat transfer oil in the circulation loop and the circulation pump is operated so that the heat transfer oil in the circulation loop exchanges heat with the air in the first hot air duct through the oil-air heat exchanger, the method further includes:

[0034] The cooling oil temperature in the circulation loop is detected. If the temperature does not reach the minimum set temperature, the molten salt in the hot salt tank is exchanged with the heat transfer oil in the circulation loop through the oil-salt heat exchanger to make the heat transfer oil temperature reach the minimum set temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of a cobalt hydroxide flash drying device according to an embodiment of the present invention.

[0036] Figure 2 Schematic diagram of a circulation loop in a cobalt hydroxide flash drying device according to an embodiment of the present invention.

[0037] Figure 3 is another schematic diagram of a circulation loop in a cobalt hydroxide flash drying device according to an embodiment of the present invention.

[0038] Figure 4 It is a schematic diagram of the connection between the oil-air heat exchanger and the hot air furnace in the cobalt hydroxide flash drying equipment according to an embodiment of the present invention.

[0039] Reference numerals:

[0040] 1. Collector; 2. Circulation pump; 3. Oil-air heat exchanger; 4. First hot air duct; 401. First air duct; 402. Second air duct; 403. Blocking plate; 5. Hot air furnace; 6. Fan; 7. Oil storage tank; 8. Burner; 9. Flash drying tower; 10. Second hot air duct; 11. First switch valve; 12. Second switch valve; 13. Thermal oil expansion tank; 14. Nitrogen tank; 15. Oil-salt heat exchanger; 16. Flow meter; 17. Filter; 18. Bypass pipeline; 19. Third switch valve. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0042] Combine the following Figure 1-Figure 4 The cobalt hydroxide flash drying equipment according to an embodiment of the present invention is described.

[0043] The cobalt hydroxide flash drying equipment of the embodiment of the present invention comprises a heat collector 1, a circulation pump 2, an oil-air heat exchanger 3, a first hot air duct 4, a hot air furnace 5, a fan 6, an oil storage tank 7, a burner 8, a flash drying tower 9 and a second hot air duct 10. The heat collector 1, the circulation pump 2 and the first chamber in the oil-air heat exchanger 3 are connected in series to form a circulation loop. The hot air furnace 5 is provided with an air inlet, the first hot air duct 4 is connected to the air inlet, the second chamber of the oil-air heat exchanger 3 is located in the first hot air duct 4, and the fan 6 is used to blow the hot air in the first hot air duct 4 into the hot air furnace 5. The oil storage tank 7, the burner 8 and the hot air furnace 5 are connected in series in sequence, and the burner 8 is used to ignite the fuel entering the hot air furnace 5; the flash drying tower 9 is connected to the air outlet of the hot air furnace 5 through the second hot air duct 10.

[0044] According to the flash drying equipment of cobalt hydroxide of the embodiment of the present invention, by connecting the collector 1, the circulation pump 2 and the first chamber in the oil-air heat exchanger 3 in series and forming a circulation loop, the collector 1 can heat the internal heat transfer oil under the sunlight radiation, and the heated heat transfer oil is driven to the first chamber in the oil-air heat exchanger 3 under the drive of the circulation pump 2 to exchange heat with the air in the second chamber, and the heated hot air in the second chamber enters the hot air furnace 5 from the first hot air duct 4 under the blowing of the fan 6, and finally enters the flash drying tower 9 from the hot air furnace 5 to achieve the drying treatment of cobalt hydroxide. Among them, when the hot air temperature in the hot air furnace 5 does not meet the drying requirements of cobalt hydroxide, the burner 8 can be turned on, and the burner 8 transports the fuel in the oil storage tank 7 to the hot air furnace 5 and ignites it to achieve the heating of the hot air, ensuring that the hot air finally entering the flash drying tower 9 is within the set temperature range. In this way, solar energy is effectively utilized, the utilization rate of light energy is improved, the drying cost of cobalt hydroxide is reduced, and the drying efficiency of cobalt hydroxide is also guaranteed.

[0045] It should be noted that Figure 1 As shown, a filter 17 is also installed on the circulation loop to filter the heat transfer oil to ensure smooth flow of the heat transfer oil in the circulation loop. The heat transfer oil can be biphenyl-biphenyl ether (mixed with biphenyl and biphenyl ether in a ratio of 26.5% and 73.5%), or it can be silicone heat transfer oil or other types of heat transfer oil. The temperature of the heat transfer oil does not exceed 400°C.

[0046] In addition, the oil-air heat exchanger 3 is of finned tube type, the heat transfer oil flows in the tube, and the air flows outside the finned tube. The number and arrangement of the tubes in the oil-air heat exchanger 3 can be designed according to the actual working conditions, and the purpose is to achieve heat exchange between the heat transfer oil and the air. The temperature of the air after heat exchange with the heat transfer oil does not exceed 350°C.

[0047] In some embodiments, Figure 2 and Figure 3 As shown, the cobalt hydroxide flash drying equipment also includes a first switch valve 11, a second switch valve 12, a thermal oil expansion tank 13 and a nitrogen tank 14. The first switch valve 11 is installed on the circulation loop, and the second switch valve 12 and the thermal oil expansion valve are connected in series and in parallel with the first switch valve 11. The nitrogen tank 14 is connected to the thermal oil expansion tank 13.

[0048] Before the circulation loop is operated, the first switch valve 11 is closed, the second switch valve 12 is opened, and the heat transfer oil is injected into the heat transfer oil expansion tank 13 through the main oil pump, and then the entire circulation loop is filled through the heat transfer oil expansion tank 13. The nitrogen tank 14 is used to provide pressure for the heat transfer oil expansion tank 13 to ensure that the internal pressure is higher than the heat transfer oil vapor pressure at the corresponding temperature to prevent the heat transfer oil from vaporizing. When the circulation loop is operated, the first switch valve 11 can be opened and the second switch valve 12 can be closed.

[0049] Specifically, there are two second switch valves 12 and they are respectively located on both sides of the thermal oil expansion tank 13 to reliably block the thermal oil in the circulation loop and the thermal oil in the thermal oil expansion tank 13 .

[0050] In some embodiments, Figure 3 As shown, the cobalt hydroxide flash drying equipment also includes an oil-salt heat exchanger 15, a cold salt tank and a hot salt tank, and the first chamber of the oil-salt heat exchanger 15 is connected in parallel with the collector 1. The cold salt tank, the second chamber of the oil-salt heat exchanger 15 and the hot salt tank are connected in series in sequence.

[0051] That is, when the light intensity is high and the temperature of the heat-conducting oil in the circulation loop reaches the set value, the heat-conducting oil can exchange heat with the molten salt through the oil-salt heat exchanger 15 to transfer the heat of the heat-conducting oil to the molten salt, so that the temperature of the cold salt in the cold salt tank increases when passing through the second chamber of the oil-salt heat exchanger 15 and enters the hot salt tank for storage. At this time, when the temperature of the heat-conducting oil in the circulation loop is low and does not meet the use requirements, the hot salt in the hot salt tank can be transported to the cold salt tank, and the heat is transferred to the heat-conducting oil when passing through the second chamber of the oil-salt heat exchanger 15, so as to complete the heating of the heat-conducting oil. This setting further improves the utilization rate of light and heat, and further reduces the drying cost of cobalt hydroxide.

[0052] In some embodiments, Figure 4As shown, there are two air inlets which are symmetrically arranged on both sides of the hot air furnace 5, the first hot air duct 4 includes a first air duct 401 and two second air ducts 402, the second chamber of the oil-air heat exchanger 3 is located in the first air duct 401, the first end of the first air duct 401 is connected with the first ends of the two second air ducts 402, the second ends of the two second air ducts 402 are respectively connected with the two air inlets, an inspection port is provided on the peripheral wall of the second air duct 402, and a blocking plate 403 capable of blocking the inspection port is installed on the second air duct 402.

[0053] That is, the hot air duct is divided into two streams through the two second air ducts 402 and enters the hot air furnace 5 at the same time, ensuring that the hot air entering the hot air furnace 5 diffuses faster and the real-time temperature detection accuracy in the hot air furnace 5 is high. By providing an inspection port, the inspection port can be exposed by opening the blocking plate 403, so that personnel can enter the hot air furnace 5 through the inspection port to complete the inspection work on the hot air furnace 5.

[0054] Specifically, both inspection ports are adjacent to the hot air furnace 5. When the circulation loop is running, the high-temperature heat transfer oil (380°C) therein enters the oil-air heat exchanger 3, exchanges heat with air in the oil-air heat exchanger 3 and cools down to 280°C. The air is sent to the second chamber of the oil-air heat exchanger 3 through the circulation pump 2, and then enters the two second air ducts 402 through the first air duct 401, and finally enters the hot air furnace 5 through the two second air ducts 402.

[0055] In some embodiments, at least two oil-air heat exchangers 3 are connected in series on the circulation loop, each oil-air heat exchanger 3 is connected in parallel with a bypass pipeline 18, and each bypass pipeline 18 is installed with a third switch valve 19; each oil-air heat exchanger 3 corresponds to a group of hot air furnace 5 and flash drying tower 9.

[0056] That is, the heat energy converted by solar radiation from the heat collector 1 can be exchanged with the air through at least two oil-air heat exchangers 3, so that the heated air is input to different hot air furnaces 5 through at least two first hot air ducts 4, and then enters different flash drying towers 9 through different hot air furnaces 5, thereby effectively improving the drying efficiency of cobalt hydroxide. In addition, when the temperature of the heat transfer oil in the circulation loop is low and cannot be supplied to all flash drying towers 9 at the same time, part of the third switch valve 19 can be opened to prevent the heat transfer oil from entering part of the oil-air heat exchangers 3 to exchange heat with the air.

[0057] Specifically, two groups of oil-air heat exchangers 3 and flash drying towers 9 are provided. By controlling the on-off of the third switch valve 19, the photothermal system formed by the circulation loop can supply heat to the two oil-air heat exchangers 3 at the same time, or only supply heat to one of the oil-air heat exchangers 3.

[0058] In the related technology, two flash drying systems are used for production, and the annual output of cobalt hydroxide is 5000t of cobalt metal. Each flash drying main unit can produce 2315kg of dry cobalt hydroxide per hour. The hot air furnace 5 provides hot air and heat by burning diesel. Each flash drying main unit is equipped with a hot air furnace 5. The main tower inlet air temperature is 300-350℃, and the heat output of the hot air furnace is 2.8 million kcal, which is equivalent to a thermal power of 3.3MW. The heating power required for the simultaneous production of two flash drying systems is 6.6MW. The annual production of cobalt hydroxide is 5000t of cobalt metal, which requires a total of 66765GJ of heat.

[0059] In some embodiments, a parabolic trough reflector or a linear Fresnel reflector is provided beside the collector 1. The collector 1 comprises a plurality of groups of vacuum heat collecting tubes connected in parallel, and each group of vacuum heat collecting tubes comprises a plurality of vacuum heat collecting tubes connected in series.

[0060] The reflector can focus sunlight so that it can burn the vacuum collector tube with higher light intensity, thereby achieving rapid heating of the heat transfer oil in the vacuum collector tube and further improving the light and heat utilization rate of the solar thermal system.

[0061] Specifically, the collector 1 is composed of several standard loops, each loop is composed of 4 collector assemblies (SCA), and each SCA is composed of 12 standard collector units (SCE). Each basic collector unit is about 12m long and 5.8m wide, and includes a space torque frame steel structure support and a vacuum collector tube. The basic collector unit has a parabolic reflector, which is arranged in 4 rows on the collector unit. The vacuum collector tube is installed on the steel structure support through a metal support every 4 meters.

[0062] Without considering the heat storage system, the collector 1 is arranged with 3 loops. The low-temperature heat transfer oil of 280℃ enters the collector 1 through the circulation loop, flows through 4 groups of SCA and heats up to 380℃, and then is sent to the oil-air heat exchanger 3 through the circulation pump 2. The heat transfer oil pipeline used in the circulation loop uses 20# carbon steel pipeline. The 3-loop collector 1 can provide about 30,000GJ of heat per year, which can be used to process and produce about 2,600t of cobalt hydroxide and cobalt metal, replacing 50% of diesel.

[0063] If a heat storage system is configured, the collector 1 will be arranged with 7 circuits. At this time, the total solar energy can provide 67,000 GJ of heat, which can be processed to produce about 5,000 tons of cobalt hydroxide and cobalt metal, thus completely replacing diesel.

[0064] In some embodiments, a first temperature sensor is installed on the circulation loop, and / or a second temperature sensor is installed on the first hot air duct 4, and / or a third temperature sensor is installed on the second hot air duct 10.

[0065] The first temperature sensor is used to detect the temperature of the heat transfer oil in the circulation loop. The circulation pump 2 can adjust the flow rate of the heat transfer oil in the circulation loop according to the detected temperature to ensure that the temperature of the heat transfer oil entering the first chamber of the oil-air heat exchanger 3 reaches the set temperature. The second temperature sensor is used to detect the hot air temperature in the first hot air duct 4. Whether the detected temperature meets the standard can be used as a standard for whether the burner 8 is enabled. The third temperature sensor can detect the hot air temperature in the second hot air duct 10. The temperature here is interlocked with the burner 8. The burner 8 can automatically adjust the flame size according to the temperature, such as using a high fire to quickly heat up when just started, and automatically switching to a low fire after the air temperature stabilizes to keep the hot air temperature stable.

[0066] It should be noted that Figure 1 As shown, a liquid level gauge is installed on the oil storage tank 7, and the liquid level gauge is interlocked with the oil pump inverter, thereby controlling the oil level of the oil storage tank 7 to remain within the set range. The valve opening of the burner 8 is interlocked with the oil delivery volume to achieve safety protection of the burner 8. When the flow rate is too small, the valve of the burner 8 should be turned off. A regulating valve is provided at the second hot air duct 10, and the temperature of the flash drying tower 9 is interlocked with the regulating valve. The temperature in the flash drying tower 9 is controlled within the set range through the regulating valve. The fan 6 is interlocked with the second temperature sensor, and the air temperature in the first hot air duct 4 is controlled within the set range by controlling the frequency of the fan 6.

[0067] The flash drying method of cobalt hydroxide according to an embodiment of the present invention comprises the following steps:

[0068] The heat collector 1 is radiated by the sun to heat the heat transfer oil in the circulation loop, and the circulation pump 2 works to make the heat transfer oil in the circulation loop exchange heat with the air in the first hot air duct 4 through the oil-air heat exchanger 3;

[0069] Start the fan 6 to blow the heated air in the first hot air duct 4 into the hot air stove 5, and adjust the temperature of the air entering the hot air stove 5 by controlling the wind force;

[0070] The hot air in the hot air furnace 5 enters the flash drying tower 9 through the second hot air duct 10 for drying operation;

[0071] The hot air temperature in the second hot air duct 10 is detected. If the minimum set temperature is reached, the burner 8 is not started, and the temperature is controlled within the set temperature range through the fan 6. If the minimum set temperature is not reached, the burner 8 is started to ignite the fuel entering the hot air furnace 5 from the oil storage tank 7, and the hot air in the second hot air duct 10 is adjusted to within the set temperature range.

[0072] The technical advantages of the cobalt hydroxide flash drying method according to the embodiment of the present invention are the same as the technical advantages of the cobalt hydroxide flash drying equipment in the above embodiment, which will not be repeated here.

[0073] In some embodiments, before starting the fan 6 to blow the heated air in the first hot air duct 4 into the hot air stove 5 and adjusting the temperature of the air entering the hot air stove 5 by controlling the wind force, the method further includes:

[0074] Circulation pump 2 adjusts the flow rate according to the temperature of the heat transfer oil in the circulation loop to ensure that the heat transfer oil in the circulation loop always reaches the set temperature range;

[0075] When the temperature of the heat transfer oil in the circulation loop reaches the maximum set temperature, the heat transfer oil is heat exchanged with the molten salt through the oil-salt heat exchanger 15 to store the heat energy in the hot salt tank.

[0076] Therefore, when there is sufficient solar thermal energy, excess heat can be stored in molten salt to improve the utilization rate of solar thermal energy.

[0077] Specifically, in the heat storage stage, the heat transfer oil heats the molten salt, and the molten salt stores excess heat. In the heat release stage, the molten salt heats the heat transfer oil to release the stored heat. The molten salt does not directly exchange heat with the air, reducing the complexity of the heat exchange system.

[0078] In some embodiments, before the heat collector 1 is subjected to solar radiation to heat the heat transfer oil in the circulation loop and the circulation pump 2 is operated so that the heat transfer oil in the circulation loop exchanges heat with the air in the first hot air duct 4 through the oil-air heat exchanger 3, the method further includes:

[0079] The cooling oil temperature in the circulation loop is detected. If the temperature does not reach the minimum set temperature, the molten salt in the hot salt tank is exchanged with the heat transfer oil in the circulation loop through the oil-salt heat exchanger 15 to make the heat transfer oil temperature reach the minimum set temperature.

[0080] The heat release of the molten salt can heat the heat transfer oil, ensuring that the heat transfer oil in the circulation loop can heat the air to the set temperature through the oil-air heat exchanger 3, ensuring that the flash drying effect of cobalt hydroxide can be achieved without burning fuel.

[0081] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A cobalt hydroxide flash drying device, characterized in that: include: A heat collector, a circulation pump and an oil-air heat exchanger, wherein the heat collector, the circulation pump and the first chamber in the oil-air heat exchanger are connected in series to form a circulation loop; a first hot air duct, a hot air furnace and a fan, wherein the hot air furnace is provided with an air inlet, the first hot air duct is communicated with the air inlet, the second chamber of the oil-air heat exchanger is located in the first hot air duct, and the fan is used to blow the hot air in the first hot air duct into the hot air furnace; An oil storage tank and a burner, wherein the oil storage tank, the burner and the hot blast furnace are connected in series in sequence, and the burner is used to ignite the fuel oil entering the hot blast furnace; A flash drying tower and a second hot air duct, wherein the flash drying tower is connected to the air outlet of the hot air furnace through the second hot air duct.

2. The cobalt hydroxide flash drying equipment according to claim 1, characterized in that The cobalt hydroxide flash drying equipment also includes: a first switch valve, wherein the first switch valve is installed on the circulation loop; a second switch valve and a thermal oil expansion tank, wherein the second switch valve and the thermal oil expansion valve are connected in series and in parallel with the first switch valve; A nitrogen tank is connected to the thermal oil expansion tank.

3. The cobalt hydroxide flash drying equipment according to claim 1, characterized in that The cobalt hydroxide flash drying equipment also includes: an oil-salt heat exchanger, wherein a first chamber of the oil-salt heat exchanger is connected in parallel with the collector; A cold salt tank and a hot salt tank, wherein the cold salt tank, the second chamber of the oil-salt heat exchanger and the hot salt tank are sequentially connected in series.

4. The cobalt hydroxide flash drying equipment according to claim 1, characterized in that There are two air inlets symmetrically arranged on both sides of the hot air furnace; The first hot air duct includes a first air duct and two second air ducts, the second chamber of the oil-air heat exchanger is located in the first air duct, the first end of the first air duct is connected with the first ends of the two second air ducts, the second ends of the two second air ducts are respectively connected with the two air inlets, an inspection port is provided on the peripheral wall of the second air duct, and a blocking plate capable of blocking the inspection port is installed on the second air duct.

5. The cobalt hydroxide flash drying equipment according to claim 1, characterized in that At least two oil-air heat exchangers are connected in series on the circulation loop, each oil-air heat exchanger is connected in parallel with a bypass pipeline, and each bypass pipeline is installed with a third switch valve; Each of the oil-air heat exchangers corresponds to a group of the hot air furnace and the flash drying tower.

6. The cobalt hydroxide flash drying equipment according to claim 1, characterized in that A parabolic trough reflector or a linear Fresnel reflector is provided on the side of the collector; The collector comprises a plurality of groups of vacuum heat collecting tubes connected in parallel, and each group of the vacuum heat collecting tubes comprises a plurality of vacuum heat collecting tubes connected in series.

7. The cobalt hydroxide flash drying equipment according to any one of claims 1 to 6, characterized in that: A first temperature sensor is installed on the circulation loop; And / or, a second temperature sensor is provided on the first hot air duct; And / or, a third temperature sensor is provided on the second hot air duct.

8. A method for flash drying of cobalt hydroxide, characterized in that: The following steps are involved: The heat collector is radiated by the sun to heat the heat transfer oil in the circulation loop, and the circulation pump works to make the heat transfer oil in the circulation loop exchange heat with the air in the first hot air duct through the oil-air heat exchanger; Starting the fan to blow the heated air in the first hot air duct into the hot air furnace, and adjusting the temperature of the air entering the hot air furnace by controlling the wind force; The hot air in the hot air furnace enters the flash drying tower through the second hot air duct for drying operation; The hot air temperature in the second hot air duct is detected. If the minimum set temperature is reached, the burner will not be started, and the temperature will be controlled within the set temperature range through the fan. If the minimum set temperature is not reached, the burner will be started to ignite the fuel entering the hot air furnace from the oil storage tank, and the hot air in the second hot air duct will be adjusted to the set temperature range.

9. The cobalt hydroxide flash drying method according to claim 8, characterized in that Before starting the fan to blow the heated air in the first hot air duct into the hot air furnace and adjusting the temperature of the air entering the hot air furnace by controlling the wind force, the method further includes: The circulation pump adjusts the flow rate according to the temperature of the heat transfer oil in the circulation loop to ensure that the heat transfer oil in the circulation loop always reaches the set temperature range; When the temperature of the heat transfer oil in the circulation loop reaches the maximum set temperature, the heat transfer oil is heat exchanged with the molten salt through the oil-salt heat exchanger to store the heat energy in the hot salt tank.

10. The cobalt hydroxide flash drying method according to claim 9, characterized in that: Before the heat collector is subjected to solar radiation to heat the heat transfer oil in the circulation loop and the circulation pump is operated so that the heat transfer oil in the circulation loop exchanges heat with the air in the first hot air duct through the oil-air heat exchanger, the method further includes: The cooling oil temperature in the circulation loop is detected. If the temperature does not reach the minimum set temperature, the molten salt in the hot salt tank is exchanged with the heat transfer oil in the circulation loop through the oil-salt heat exchanger to make the heat transfer oil temperature reach the minimum set temperature.

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