WO2020134535A1 - Dual heat source swirl flash calcination system and dual heat source swirl flash calcination method - Google Patents
Dual heat source swirl flash calcination system and dual heat source swirl flash calcination method Download PDFInfo
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- WO2020134535A1 WO2020134535A1 PCT/CN2019/114615 CN2019114615W WO2020134535A1 WO 2020134535 A1 WO2020134535 A1 WO 2020134535A1 CN 2019114615 W CN2019114615 W CN 2019114615W WO 2020134535 A1 WO2020134535 A1 WO 2020134535A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
- F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/03—Calcining
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/16—Treatment involving a chemical reaction
Definitions
- the invention relates to a mineral calcination equipment and process, in particular to a dual heat source cyclone flash calcination system and a dual heat source cyclone flash calcination method.
- powder calcination In order to protect the environment and turn waste into treasure, it is necessary to carry out the necessary deep processing and increase the added value.
- powder calcination By means of powder calcination, resources can be reused, thereby reducing the burden on the environment.
- powder calcination has the advantages of short calcination time, large heat transfer coefficient and high product quality, and has a broad market prospect.
- the technologies used for powder calcination mainly include fluidized bed roasting process, cyclone dynamic calcination process and suspension calcination process, but these processes have the following defects: complex equipment, huge, high heat consumption, product quality control Difficulty and low product activity.
- the applicant of the present invention has proposed a flash calcination device (public number CN106766865), which uses industrial solid waste calcium carbide slag as the raw material for calcination, and has achieved the flash calcination of calcium carbide slag .
- a flash calcination device public number CN106766865
- the same type of powder materials also have different compositions. Powder materials often show multiple stages of decomposition of different substances during the calcination process, such as the first stage of calcium carbide slag is a low temperature section The second stage is the decomposition of calcium carbonate in the high-temperature stage.
- the present invention provides a dual heat source cyclone flash calcination system and dual heat source cyclone which can consider the powder material exhibiting multi-stage decomposition characteristics of different substances during the calcination process, thereby reducing the heat consumption of the system and increasing the service life of the equipment
- the flash calcination method will be advantageous.
- a dual-heat source cyclone flash calcination system which includes a drying unit for drying powder raw materials connected in sequence, a discharge bin, a frequency-controlled rotary feeder, and Venturi A feeder, a flash calcination unit, a cyclone secondary heating material collection unit, and a material cooling unit and a first flue gas processing unit respectively connected to the cyclone secondary heating material collection unit, which also include a hot air furnace, which is Connect the high-temperature flue gas inlet of the flash calcination unit to complete the first calcination reaction in the flash calcination unit, and connect the material outlet of the flash calcination unit to heat the material again to complete the first in the cyclone secondary heating material collection unit Second calcination reaction, and the Venturi feeder is also connected with a pneumatic conveying unit to feed the powder raw material into the flash calcining unit in the form of a gas-solid mixture, and the material cooling unit is also connected with a bottom
- the advantages of the present invention are: 1) the powder calcination time is short; 2) the flash calcination is followed by the cyclone secondary heating, that is, the dual heat source cyclone flash calcination is adopted, so that the calcium carbide slag is decomposed in stages, and the flash calcination unit is realized Calcium hydroxide is decomposed, and cyclone is heated twice to achieve calcium carbonate decomposition, which reduces the energy consumption of calcination, properly solves the limitation of the material of the flash calcination unit, and avoids the clogging problem of the flash calcination unit, which makes the flash
- the service life of the speed calcination unit improves the service life and operation rate of the entire system.
- the lime material after calcination of the powder material has high activity and good product quality; 3)
- the conveying pressure of the material can be changed by the pneumatic conveying unit Flow rate:
- the feeder can be changed by the frequency-controlled rotary feeder, so as to accurately control the material flow rate and residence time, and control the heat load and reaction temperature in the flash calcination unit through the high-temperature flue gas flow and temperature from the hot air furnace. So as to ensure the sufficiency and uniformity of the calcination of powder materials.
- the above-mentioned flash calcination unit has a calcination reaction spiral tube and a high-temperature flue gas furnace surrounding the calcination reaction spiral tube, the calcination reaction spiral tube has a material inlet and a material outlet connected to a venturi feeder, the high-temperature flue gas The furnace has a high temperature flue gas inlet to indirectly exchange heat with the materials in the calcination reaction spiral tube.
- the flash calcination unit uses indirect heat exchange to heat the powdered material, the powdered material and the high-temperature flue gas are independent of each other, so the control is relatively simple.
- the other path of the above-mentioned hot blast stove has a hot blast nozzle, the hot blast nozzle and the material outlet are arranged in the same direction, and the cyclone secondary heating material collection unit is provided with a material tangential inlet.
- the animal material conveying the wind belt enters the calcination reaction spiral tube of the flash calcination unit by tangential entry, and then moves downwardly along the calcination reaction spiral tube, on the one hand, it prolongs the stay of the material in the calcination reaction spiral tube Time, on the other hand, can make the material fully contact with the wall surface of the calcination reaction spiral tube, strengthen the heat exchange between the flue gas outside the calcination reaction spiral tube and the material inside, and improve the heat exchange efficiency; for the effective separation of the materials, the mixed gas-solid The mixture enters the cyclone secondary heating material collection unit by tangential entry.
- a baffle structure is provided on the inner wall of the high-temperature flue gas furnace of the flash calcination unit.
- the above-mentioned flash calcination unit is also connected to the drying unit to provide a drying heat source to the drying unit.
- the flue gas from the flash calcination unit is sent to the flash drying unit 1 as a drying heat source, so as to realize the full utilization of thermal energy.
- drying unit is also connected to a chimney.
- a dual heat source cyclone flash calcination method for calcining powder raw materials using the dual heat source cyclone flash calcination system which includes the following steps:
- Compressed air is supplied to the venturi feeder as pneumatic air through the pneumatic conveying unit to convey the calcium carbide slag dry powder to the flash calcination unit.
- the pneumatic calcium slag dry powder is conveyed in the flash calcining unit and the high-temperature flue gas from the hot air furnace Perform indirect heat exchange, perform calcination once to complete the decomposition reaction of calcium hydroxide and generate gas-solid mixture;
- the gas-solid mixture after the primary calcination leaves the flash calcination unit and is mixed and heated with another high-temperature flue gas from the hot air furnace, and enters the cyclone secondary heating material collection unit for secondary calcination to complete the calcium carbonate decomposition reaction.
- the gas-solid mixture after calcination is subjected to gas-solid separation;
- the calcium carbide slag dry powder enters the flash calcination unit in a tangential form, and is driven from the top to the bottom of the flash calcination unit in a swirling manner by being driven by the conveying air, and moves from 700 to 800 In the temperature range of °C, primary calcination is carried out to remove H2O of calcium hydroxide to generate calcium oxide; in step 4), secondary calcination is carried out above 900 °C, and CO2 in the material is removed to form calcium oxide.
- the temperature of the above primary calcination is 750°C.
- FIG. 1 is a schematic structural view of a dual heat source swirl flash calcination system according to a specific embodiment of the present invention
- FIG. 2 is an enlarged schematic top view of the calcination reaction spiral tube of the flash calcination unit of the dual heat source cyclone flash calcination system shown in FIG. 1, showing the material inlet in the tangential direction of the calcination reaction spiral tube.
- a dual heat source cyclone flash calcination system includes a drying unit for drying powder raw materials connected in sequence 1, a discharge hopper 2, a frequency-controlled rotary feeder 3.
- Venturi feeder 4 flash calcination unit 6, cyclone secondary heating material collection unit 7, material cooling unit 8 and first flue gas processing unit 9, respectively connected to the cyclone secondary heating material collection unit 7, hot air Furnace 10, first chimney 11, wherein the hot blast furnace 10 is connected all the way to the high temperature flue gas inlet 61 of the flash calcination unit 6 to complete the first calcination reaction in the flash calcination unit 6, the first calcination reaction is calcium hydroxide Decomposition reaction, another way is connected to the material outlet 63 of the flash calcination unit 6 to heat the material again, so as to complete the second calcination reaction in the cyclone secondary heating material collection unit 7, the second calcination reaction is calcium carbonate decomposition reaction, and,
- the venturi feeder 4 is also connected with
- the flash calcination unit 6 is also connected to the drying unit 1 to provide a drying heat source to the drying unit, the drying unit is also connected to a second flue gas processing unit 29, and the second flue gas processing unit 29 is connected to the second chimney 21.
- the flash calcination unit 6 has a calcination reaction spiral tube 65 and a high-temperature flue gas furnace 67 surrounding the calcination reaction spiral tube 65.
- the calcination reaction spiral tube 65 has a material connected to the venturi feeder 4
- the inlet 62 and the above-mentioned material outlet 63, the high-temperature flue gas furnace 67 has the above-mentioned high-temperature flue gas inlet 61, so that the materials in the calcination reaction spiral tube 65 can indirectly exchange heat with the high-temperature flue gas in the high-temperature flue gas furnace 67.
- the other path of the hot blast stove 10 has a hot blast nozzle (not shown), and the hot blast nozzle and the material outlet 63 are arranged in the same direction.
- the material inlet 62 is arranged such that the material enters the calcination reaction spiral tube 65 tangentially, as shown in FIG. 2.
- the cyclone secondary heating material collection unit 7 is provided with a material tangential inlet (not shown).
- the inner wall of the high-temperature flue gas furnace 67 of the flash calcination unit 6 is provided with a baffle structure (not shown).
- the baffle structure includes a plurality of baffle plates arranged in a staggered manner.
- the un-dried calcium carbide slag powder is sent to the drying unit 1 of the dual heat source cyclone flash calcination system for drying to generate dried materials.
- the dried materials enter the lower hopper 2 and are fed in through the frequency-controlled rotary feeder 3
- the Venturi feeder 4 supplies compressed air to the Venturi feeder 4 as the conveying air through the pneumatic conveying unit 5 to transport the calcium carbide slag material to the flash calcination unit 6, the gas-solid mixture enters the flash calcination unit 6 in a tangential form
- the calcined reaction spiral tube 65, the calcium carbide slag powder is driven by conveying air in a swirling manner in the calcination reaction spiral tube 65 to move downward from the top along the predetermined rotation direction, in the flash calcination unit 6, by pneumatic conveying
- the dry powder of calcium carbide slag is indirectly exchanged with the high temperature flue gas (shown by the broken arrow) from the hot blast stove 10, and the material is calcined at a temperature of
- the material is subjected to secondary calcination at above 900 °C to remove the CO2 of the calcium carbonate in the material to form calcium oxide (second calcination reaction).
- the separated powder is cooled in the material cooling unit 8 It is collected by the bottom cone 12 and the separated secondary calcined flue gas still contains a certain amount of lime powder, which is further transferred from the cyclone secondary heating material collection unit 7 to the first flue gas treatment unit 9 for dust collection. After reaching the emission standard, it is discharged into the atmosphere through the first chimney 11.
- the high-temperature flue gas from the hot blast stove 10 exchanges heat between the high-temperature flue gas furnace 67 of the flash calcination unit 6 and the material in the calcination reaction spiral tube 65, and then is sent to the high-temperature flue gas outlet 68 of the high-temperature flue gas furnace 67 to
- the drying unit 1 provides a drying heat source for the drying unit 1 to realize the full use of heat energy.
- the flue gas that completes the drying task in the drying unit 1 then enters the second flue gas processing unit 29 and is processed by the second flue gas processing unit 29 It is discharged through the second chimney 21.
- the calcination of calcium carbide slag powder is taken as an example to illustrate that the temperature of the first calcination reaction is about 750°C and the temperature of the second calcination reaction is above 900°C, it should be understood that the system and method of the present invention It is not limited to calcined calcium carbide slag powder, but can also be used for calcining basic zinc carbonate, aluminum hydroxide, etc., but when calcining basic zinc carbonate, aluminum hydroxide, etc., the temperature of the first calcination reaction and the second calcination reaction is based on The calcined powder may be adjusted accordingly.
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Abstract
The present invention provides a dual heat source swirl flash calcination system, comprising a drying unit, an unloading bin, a frequency-controlled rotary feeder, a Venturi feeder, a flash calcination unit, and a cyclone secondary heating material collection unit that are connected in sequence, and also comprising a material cooling unit, a first flue gas treatment unit, and a hot blast stove. One path of the hot blast stove is connected to the high temperature flue gas inlet of the flash calcination unit to complete first calcination reaction, and the other path is connected to the material outlet of the flash calcination unit to complete second calcination reaction. The Venturi feeder is connected to a pneumatic conveying unit. The material cooling unit is connected to a bottom cone. The present invention also provides a dual heat source swirl flash calcination method. The present invention features a short powder calcination time, powder calcination sufficiency and uniformity, and high activity of lime after calcination, achieves low energy consumption, solves the limitation problem of the material of the flash calcination unit, avoids the blocking problem of the flash calcination unit, and prolongs the service life of the flash calcination unit.
Description
本发明涉及一种矿物煅烧设备和工艺，特别涉及一种双热源旋流闪速煅烧***及双热源旋流闪速煅烧方法。The invention relates to a mineral calcination equipment and process, in particular to a dual heat source cyclone flash calcination system and a dual heat source cyclone flash calcination method.
在矿山开采过程中产生的小料，生产过程中产生的矿渣，例如电石炉产生的电石渣、铅锌矿浮选之后的矿渣、脱硫过程产生的脱硫灰等，这些材料因粒径达不到要求而不能用于传统工艺的煅烧，存在着极大的资源浪费，且其往往具有较强的酸碱性，无论是露天堆放，还是采取掩埋的处理方式，都会对环境造成严重的污染，危及居民生活和身体健康。Small materials produced during mine mining, slag produced during production, such as calcium carbide slag produced by calcium carbide furnace, slag after lead-zinc ore flotation, desulfurized ash produced during desulfurization, etc. These materials cannot reach the particle size It is required and cannot be used in the calcination of traditional processes. There is a great waste of resources, and it often has a strong acidity and alkalinity. Whether it is stacked in the open or buried, it will cause serious pollution to the environment and endanger the environment. Residents' lives and health.
为了保护环境、变废为宝，有必要对其进行必要的深加工，提高附加值。通过粉体煅烧的方式，可实现资源再利用，从而减轻环境的负担。粉体煅烧相对于传统的块状煅烧方式具有煅烧时间短、换热系数大、产品品质高等优点，有着广阔的市场前景。目前世界范围内，用于粉体煅烧的技术主要有流化床焙烧工艺、旋流动态煅烧工艺及悬浮煅烧工艺，但这些工艺都存在如下缺陷：设备复杂、庞大，热耗高，产品质量控制难度大，产品活性低。In order to protect the environment and turn waste into treasure, it is necessary to carry out the necessary deep processing and increase the added value. By means of powder calcination, resources can be reused, thereby reducing the burden on the environment. Compared with the traditional bulk calcination method, powder calcination has the advantages of short calcination time, large heat transfer coefficient and high product quality, and has a broad market prospect. At present, the technologies used for powder calcination mainly include fluidized bed roasting process, cyclone dynamic calcination process and suspension calcination process, but these processes have the following defects: complex equipment, huge, high heat consumption, product quality control Difficulty and low product activity.
为解决电石行业电石渣的循环回收利用，本发明的申请人提出了一种闪速煅烧装置(公开号为CN106766865)，采取工业固废电石渣作为原料进行煅烧，已经实现电石渣的闪速煅烧。然而，由于不同粉体材料性质各异，同一类粉体材料也存在成分不一的情况，粉体材料在煅烧过程中往往表现出多阶段不同物质的分解，如电石渣第一阶段为低温段的氢氧化钙分解，第二阶段为高温段的碳酸钙分解，如果同在闪速煅烧单元进行高温煅烧来完成这两个阶段的分解，将对煅烧单元的材质提出更高的要求，影响设备的使用寿命，同时也不利于降低能耗。In order to solve the recycling and utilization of calcium carbide slag in the calcium carbide industry, the applicant of the present invention has proposed a flash calcination device (public number CN106766865), which uses industrial solid waste calcium carbide slag as the raw material for calcination, and has achieved the flash calcination of calcium carbide slag . However, due to the different properties of different powder materials, the same type of powder materials also have different compositions. Powder materials often show multiple stages of decomposition of different substances during the calcination process, such as the first stage of calcium carbide slag is a low temperature section The second stage is the decomposition of calcium carbonate in the high-temperature stage. If high-temperature calcination is carried out in the flash calcination unit to complete the decomposition in these two stages, higher requirements will be placed on the material of the calcination unit, affecting the equipment The service life is also not conducive to reducing energy consumption.
发明内容：Summary of the invention:
为克服上述问题，本发明提供一种能够考虑粉体材料在煅烧过程中呈现不同物质多阶段分解特性从而降低***热耗并提高设备使用寿命的双热源旋流闪速煅烧***及双热源旋流闪速煅烧方法将是有利的。In order to overcome the above problems, the present invention provides a dual heat source cyclone flash calcination system and dual heat source cyclone which can consider the powder material exhibiting multi-stage decomposition characteristics of different substances during the calcination process, thereby reducing the heat consumption of the system and increasing the service life of the equipment The flash calcination method will be advantageous.
为此，根据本发明的一个方面，提供一种双热源旋流闪速煅烧***，包括依次连接的粉体原料烘干用干燥单元、下料料仓、变频控制的旋转供料器、文丘里供料器、闪速煅烧单元、旋风二次加热物料收集单元，以及分别与旋风二次加热物料收集单元连接的物料冷却单元和第一烟气处理单元，其中，还包括热风炉，该热风炉一路连接闪速煅烧单元的高温烟气入口以在闪速煅烧单元内完成第一煅烧反应，另一路连接闪速煅烧单元的物料出口以再次加热物料从而在旋风二次加热物料收集单元内完成第二煅烧反应，并且，文丘里供料器还连接有气力输送单元以将粉体原料以气固混合物的形式送入闪速煅烧单元，物料冷却单元还连接有底部锥斗。进一步，上述第一煅烧反应为氢氧化钙分解反应，第二煅烧反应为碳酸钙分解反应。To this end, according to one aspect of the present invention, a dual-heat source cyclone flash calcination system is provided, which includes a drying unit for drying powder raw materials connected in sequence, a discharge bin, a frequency-controlled rotary feeder, and Venturi A feeder, a flash calcination unit, a cyclone secondary heating material collection unit, and a material cooling unit and a first flue gas processing unit respectively connected to the cyclone secondary heating material collection unit, which also include a hot air furnace, which is Connect the high-temperature flue gas inlet of the flash calcination unit to complete the first calcination reaction in the flash calcination unit, and connect the material outlet of the flash calcination unit to heat the material again to complete the first in the cyclone secondary heating material collection unit Second calcination reaction, and the Venturi feeder is also connected with a pneumatic conveying unit to feed the powder raw material into the flash calcining unit in the form of a gas-solid mixture, and the material cooling unit is also connected with a bottom cone. Further, the first calcination reaction is a calcium hydroxide decomposition reaction, and the second calcination reaction is a calcium carbonate decomposition reaction.
本发明的优点在于：1)粉体煅烧时间短；2)采用闪速煅烧后再进行旋风二次加热，即采用双热源旋流闪速煅烧，使电石渣分阶段分解，闪速煅烧单元实现氢氧化钙分解，旋风二次加热实现碳酸钙分解，这降低了煅烧能耗，妥善地解决了闪速煅烧单元材质的限制，并避免了闪速煅烧单元的堵塞问题，使得一方面提高了闪速煅烧单元的使用寿命，从而提高了整个***的使用寿命及运转率，另一方面使得粉体物料煅烧后的石灰活性度高，产品质量好；3)通过气力输送单元能够改变物料的输送压力、流量；通过变频控制的旋转供料器能够改变下料量，从而精确控制物料流速及停留时间，通过来自热风炉的高温烟气流量和温度控制闪速煅烧单元内的热负荷、反应温度，从而保证粉体物料煅烧的充分性及均匀性。The advantages of the present invention are: 1) the powder calcination time is short; 2) the flash calcination is followed by the cyclone secondary heating, that is, the dual heat source cyclone flash calcination is adopted, so that the calcium carbide slag is decomposed in stages, and the flash calcination unit is realized Calcium hydroxide is decomposed, and cyclone is heated twice to achieve calcium carbonate decomposition, which reduces the energy consumption of calcination, properly solves the limitation of the material of the flash calcination unit, and avoids the clogging problem of the flash calcination unit, which makes the flash The service life of the speed calcination unit improves the service life and operation rate of the entire system. On the other hand, the lime material after calcination of the powder material has high activity and good product quality; 3) The conveying pressure of the material can be changed by the pneumatic conveying unit Flow rate: The feeder can be changed by the frequency-controlled rotary feeder, so as to accurately control the material flow rate and residence time, and control the heat load and reaction temperature in the flash calcination unit through the high-temperature flue gas flow and temperature from the hot air furnace. So as to ensure the sufficiency and uniformity of the calcination of powder materials.
再进一步，上述闪速煅烧单元具有煅烧反应螺旋管和围绕该煅烧反应螺旋管的高温烟气炉膛，该煅烧反应螺旋管具有与文丘里供料器连接的物料入口和物料出口，该高温烟气炉膛具有高温烟气入口以与该煅烧反应螺旋管内的物料间接换热。Still further, the above-mentioned flash calcination unit has a calcination reaction spiral tube and a high-temperature flue gas furnace surrounding the calcination reaction spiral tube, the calcination reaction spiral tube has a material inlet and a material outlet connected to a venturi feeder, the high-temperature flue gas The furnace has a high temperature flue gas inlet to indirectly exchange heat with the materials in the calcination reaction spiral tube.
由于闪速煅烧单元采用间接热交换的方式对粉状物料进行加热，粉状物料与高温烟气相互独立，因此控制相对简单。Since the flash calcination unit uses indirect heat exchange to heat the powdered material, the powdered material and the high-temperature flue gas are independent of each other, so the control is relatively simple.
又进一步，上述热风炉的另一路具有热风喷口，该热风喷口与物料出口设置成方向一致，旋风二次加热物料收集单元设置有物料切向入口。Still further, the other path of the above-mentioned hot blast stove has a hot blast nozzle, the hot blast nozzle and the material outlet are arranged in the same direction, and the cyclone secondary heating material collection unit is provided with a material tangential inlet.
通过上述结构设置，输送风带动物料采用切向进入的方式进入闪速煅烧单元的煅烧反应螺旋管后，沿着煅烧反应螺旋管盘旋向下运动，一方面延长了物料在煅烧反应螺旋管内停留的时间，另一方面可以使物料与煅烧反应螺旋管的壁面充分接触，加强煅烧反应螺旋管外的烟气与其内物料的热交换，提高换热效率；为了物料的有效分离，混合后的气固混合物采用切向进入的方式进入旋风二次加热物料收集单元。Through the above-mentioned structural arrangement, the animal material conveying the wind belt enters the calcination reaction spiral tube of the flash calcination unit by tangential entry, and then moves downwardly along the calcination reaction spiral tube, on the one hand, it prolongs the stay of the material in the calcination reaction spiral tube Time, on the other hand, can make the material fully contact with the wall surface of the calcination reaction spiral tube, strengthen the heat exchange between the flue gas outside the calcination reaction spiral tube and the material inside, and improve the heat exchange efficiency; for the effective separation of the materials, the mixed gas-solid The mixture enters the cyclone secondary heating material collection unit by tangential entry.
还进一步，上述闪速煅烧单元的高温烟气炉膛的内壁上设置有折流板结构。Still further, a baffle structure is provided on the inner wall of the high-temperature flue gas furnace of the flash calcination unit.
通过上述结构设置，在强化高温烟气的旋流效果的同时，增强高温烟气与煅烧反应螺旋管的外壁之间的热交换效率。Through the above structural arrangement, while enhancing the swirling effect of the high-temperature flue gas, the heat exchange efficiency between the high-temperature flue gas and the outer wall of the calcination reaction spiral tube is enhanced.
进一步，上述闪速煅烧单元还与干燥单元连接以向干燥单元提供烘干热源。Further, the above-mentioned flash calcination unit is also connected to the drying unit to provide a drying heat source to the drying unit.
通过上述设置，闪速煅烧单元出来的烟气送至闪蒸干燥单元1作为烘干热源，实现热能的充分利用。Through the above settings, the flue gas from the flash calcination unit is sent to the flash drying unit 1 as a drying heat source, so as to realize the full utilization of thermal energy.
再进一步，上述干燥单元还连接有烟囱。Still further, the drying unit is also connected to a chimney.
根据本发明的另一个方面，提供一种利用上述双热源旋流闪速煅烧***进行粉体原料煅烧的双热源旋流闪速煅烧方法，其包括如下步骤：According to another aspect of the present invention, there is provided a dual heat source cyclone flash calcination method for calcining powder raw materials using the dual heat source cyclone flash calcination system, which includes the following steps:
1)将未烘干的电石渣粉料送入干燥单元进行干燥以生成电石渣干粉；1) Send the un-dried calcium carbide slag powder to the drying unit for drying to produce calcium carbide slag dry powder;
2)电石渣干粉进入下料料仓，并通过变频控制的旋转供料器送入文丘里供料器；2) The dry powder of calcium carbide slag enters the feeding silo, and is fed into the venturi feeder through the rotary feeder controlled by frequency conversion;
3)通过气力输送单元向文丘里供料器提供压缩空气作为输送空气将电石渣干粉输送至闪速煅烧单元，通过气力输送的电石渣干粉在闪速煅烧单元内与来自热风炉的高温烟气进行间接换热，进行一次煅烧完成氢氧化钙分解反 应并生成气固混合物；3) Compressed air is supplied to the venturi feeder as pneumatic air through the pneumatic conveying unit to convey the calcium carbide slag dry powder to the flash calcination unit. The pneumatic calcium slag dry powder is conveyed in the flash calcining unit and the high-temperature flue gas from the hot air furnace Perform indirect heat exchange, perform calcination once to complete the decomposition reaction of calcium hydroxide and generate gas-solid mixture;
4)一次煅烧后的气固混合物离开闪速煅烧单元并与来自热风炉的另一路高温烟气混合加热，进入旋风二次加热物料收集单元进行二次煅烧完成碳酸钙分解反应，同时对二次煅烧后的气固混合物进行气固分离；4) The gas-solid mixture after the primary calcination leaves the flash calcination unit and is mixed and heated with another high-temperature flue gas from the hot air furnace, and enters the cyclone secondary heating material collection unit for secondary calcination to complete the calcium carbonate decomposition reaction. The gas-solid mixture after calcination is subjected to gas-solid separation;
5)气固分离后的粉料经物料冷却单元冷却后由底部锥斗收集，同时气固分离后的二次煅烧烟气经收尘后排放。5) The powder material after the gas-solid separation is cooled by the material cooling unit and collected by the bottom cone funnel, and the secondary calcined flue gas after the gas-solid separation is discharged after collecting dust.
进一步，在上述步骤3)中，电石渣干粉以切向形式进入闪速煅烧单元，在闪速煅烧单元内通过输送空气的带动以旋流的方式从由上向下运动，并在700～800℃的温度范围内进行一次煅烧脱去其中氢氧化钙的H2O而生成氧化钙；在步骤4)中，二次煅烧在900℃以上进行，脱去物料中碳酸钙的CO2生成氧化钙。Further, in the above step 3), the calcium carbide slag dry powder enters the flash calcination unit in a tangential form, and is driven from the top to the bottom of the flash calcination unit in a swirling manner by being driven by the conveying air, and moves from 700 to 800 In the temperature range of ℃, primary calcination is carried out to remove H2O of calcium hydroxide to generate calcium oxide; in step 4), secondary calcination is carried out above 900 ℃, and CO2 in the material is removed to form calcium oxide.
再进一步,上述一次煅烧的温度为750℃。Still further, the temperature of the above primary calcination is 750°C.
通过参考下面所描述的实施例，本发明的上述这些方面和其他方面将会得到更清晰地阐述。These and other aspects of the present invention will be more clearly explained by referring to the embodiments described below.
发明的结构以及进一步的目的和优点将通过下面结合附图的描述得到更好地理解，其中，相同的参考标记标识相同的元件：The structure of the invention and further objects and advantages will be better understood through the following description in conjunction with the accompanying drawings, wherein the same reference signs identify the same elements:
图1是根据本发明的一个具体实施方式的双热源旋流闪速煅烧***的结构示意图；1 is a schematic structural view of a dual heat source swirl flash calcination system according to a specific embodiment of the present invention;
图2是图1所示双热源旋流闪速煅烧***的闪速煅烧单元的煅烧反应螺旋管的放大了的示意性俯视图，图中示出了处于煅烧反应螺旋管切向上的物料入口。FIG. 2 is an enlarged schematic top view of the calcination reaction spiral tube of the flash calcination unit of the dual heat source cyclone flash calcination system shown in FIG. 1, showing the material inlet in the tangential direction of the calcination reaction spiral tube.
下面将结合附图描述本发明的一个具体实施方式。A specific embodiment of the present invention will be described below with reference to the drawings.
如图1所示，根据本发明的一个具体实施方式的双热源旋流闪速煅烧系 统包括依次连接的粉体原料烘干用干燥单元1、下料料仓2、变频控制的旋转供料器3、文丘里供料器4、闪速煅烧单元6、旋风二次加热物料收集单元7、分别与旋风二次加热物料收集单元7连接的物料冷却单元8和第一烟气处理单元9、热风炉10、第一烟囱11，其中，该热风炉10一路连接闪速煅烧单元6的高温烟气入口61以在闪速煅烧单元6内完成第一煅烧反应，该第一煅烧反应为氢氧化钙分解反应，另一路连接闪速煅烧单元6的物料出口63以再次加热物料，从而在旋风二次加热物料收集单元7内完成第二煅烧反应，该第二煅烧反应为碳酸钙分解反应，并且，文丘里供料器4还连接有气力输送单元5，以将粉体原料以气固混合物的形式送入闪速煅烧单元6，物料冷却单元8还连接有底部锥斗12，该底部锥斗12用作物料收集单元。另外，闪速煅烧单元6还与干燥单元1连接以向干燥单元提供烘干热源，干燥单元还连接有第二烟气处理单元29，第二烟气处理单元29连接有第二烟囱21。As shown in FIG. 1, a dual heat source cyclone flash calcination system according to a specific embodiment of the present invention includes a drying unit for drying powder raw materials connected in sequence 1, a discharge hopper 2, a frequency-controlled rotary feeder 3. Venturi feeder 4, flash calcination unit 6, cyclone secondary heating material collection unit 7, material cooling unit 8 and first flue gas processing unit 9, respectively connected to the cyclone secondary heating material collection unit 7, hot air Furnace 10, first chimney 11, wherein the hot blast furnace 10 is connected all the way to the high temperature flue gas inlet 61 of the flash calcination unit 6 to complete the first calcination reaction in the flash calcination unit 6, the first calcination reaction is calcium hydroxide Decomposition reaction, another way is connected to the material outlet 63 of the flash calcination unit 6 to heat the material again, so as to complete the second calcination reaction in the cyclone secondary heating material collection unit 7, the second calcination reaction is calcium carbonate decomposition reaction, and, The venturi feeder 4 is also connected with a pneumatic conveying unit 5 to feed the powder raw material into the flash calcination unit 6 in the form of a gas-solid mixture, and the material cooling unit 8 is also connected with a bottom cone 12 which has a bottom cone 12 Used as a material collection unit. In addition, the flash calcination unit 6 is also connected to the drying unit 1 to provide a drying heat source to the drying unit, the drying unit is also connected to a second flue gas processing unit 29, and the second flue gas processing unit 29 is connected to the second chimney 21.
再如图1所示，闪速煅烧单元6具有煅烧反应螺旋管65和围绕该煅烧反应螺旋管65的高温烟气炉膛67，该煅烧反应螺旋管65具有与文丘里供料器4连接的物料入口62和上述物料出口63，该高温烟气炉膛67具有上述高温烟气入口61，从而使得该煅烧反应螺旋管65内的物料能够和高温烟气炉膛67内的高温烟气进行间接换热。As shown in FIG. 1 again, the flash calcination unit 6 has a calcination reaction spiral tube 65 and a high-temperature flue gas furnace 67 surrounding the calcination reaction spiral tube 65. The calcination reaction spiral tube 65 has a material connected to the venturi feeder 4 The inlet 62 and the above-mentioned material outlet 63, the high-temperature flue gas furnace 67 has the above-mentioned high-temperature flue gas inlet 61, so that the materials in the calcination reaction spiral tube 65 can indirectly exchange heat with the high-temperature flue gas in the high-temperature flue gas furnace 67.
又进一步，上述热风炉10的另一路具有热风喷口(图未示)，该热风喷口与物料出口63设置成方向一致。物料入口62设置成物料切向进入煅烧反应螺旋管65，如图2所示。在本实施方式中，旋风二次加热物料收集单元7设置有物料切向入口(图未示)。另外，闪速煅烧单元6的高温烟气炉膛67的内壁上设置有折流板结构(图未示)，该折流板结构包括多块交错排列的折流板。Still further, the other path of the hot blast stove 10 has a hot blast nozzle (not shown), and the hot blast nozzle and the material outlet 63 are arranged in the same direction. The material inlet 62 is arranged such that the material enters the calcination reaction spiral tube 65 tangentially, as shown in FIG. 2. In this embodiment, the cyclone secondary heating material collection unit 7 is provided with a material tangential inlet (not shown). In addition, the inner wall of the high-temperature flue gas furnace 67 of the flash calcination unit 6 is provided with a baffle structure (not shown). The baffle structure includes a plurality of baffle plates arranged in a staggered manner.
下面，以电石渣煅烧为例，介绍本实施方式的双热源旋流闪速煅烧***的工艺过程：Next, taking calcium carbide slag calcination as an example, the process of the dual heat source swirl flash calcination system of this embodiment is introduced:
将未烘干的电石渣粉料送入双热源旋流闪速煅烧***的干燥单元1进行干燥以生成干燥物料，干燥物料进入下料料仓2，通过变频控制的旋转供料器3送入文丘里供料器4，通过气力输送单元5向文丘里供料器4提供压缩空气 作为输送空气将电石渣物料输送至闪速煅烧单元6，气固混合物以切向形式进入闪速煅烧单元6的煅烧反应螺旋管65，电石渣粉料在输送空气的带动下以旋流的方式在煅烧反应螺旋管65内沿既定旋向从顶部向下运动，在闪速煅烧单元6内，通过气力输送的电石渣干粉与来自热风炉10的高温烟气(虚线箭头所示)进行间接换热，物料在750℃左右的温度下经过煅烧脱去物料中氢氧化钙的H2O生成氧化钙(第一煅烧反应)，煅烧后的气固混合物通过闪速煅烧单元6的煅烧反应螺旋管65进入旋风二次加热物料收集单元7，与来自热风炉10的另一路高温烟气(实线箭头所示)混合进行加热，同时完成物料的气固分离，物料在900℃以上经过二次煅烧脱去物料中碳酸钙的CO2生成氧化钙(第二煅烧反应)，分离后的粉料在物料冷却单元8冷却后，由底部锥斗12收集，经分离后的二次煅烧烟气中仍含有一定量的石灰粉体，进一步从旋风二次加热物料收集单元7输送至第一烟气处理单元9进行收尘，达到排放标准后，通过第一烟囱11排入大气。The un-dried calcium carbide slag powder is sent to the drying unit 1 of the dual heat source cyclone flash calcination system for drying to generate dried materials. The dried materials enter the lower hopper 2 and are fed in through the frequency-controlled rotary feeder 3 The Venturi feeder 4 supplies compressed air to the Venturi feeder 4 as the conveying air through the pneumatic conveying unit 5 to transport the calcium carbide slag material to the flash calcination unit 6, the gas-solid mixture enters the flash calcination unit 6 in a tangential form The calcined reaction spiral tube 65, the calcium carbide slag powder is driven by conveying air in a swirling manner in the calcination reaction spiral tube 65 to move downward from the top along the predetermined rotation direction, in the flash calcination unit 6, by pneumatic conveying The dry powder of calcium carbide slag is indirectly exchanged with the high temperature flue gas (shown by the broken arrow) from the hot blast stove 10, and the material is calcined at a temperature of about 750°C to remove the H2O of calcium hydroxide in the material to produce calcium oxide (first calcination Reaction), the calcined gas-solid mixture enters the cyclone secondary heating material collection unit 7 through the calcination reaction spiral tube 65 of the flash calcination unit 6, and is mixed with another high-temperature flue gas (shown by solid arrows) from the hot air furnace 10 It is heated, and the gas-solid separation of the material is completed at the same time. The material is subjected to secondary calcination at above 900 °C to remove the CO2 of the calcium carbonate in the material to form calcium oxide (second calcination reaction). The separated powder is cooled in the material cooling unit 8 It is collected by the bottom cone 12 and the separated secondary calcined flue gas still contains a certain amount of lime powder, which is further transferred from the cyclone secondary heating material collection unit 7 to the first flue gas treatment unit 9 for dust collection. After reaching the emission standard, it is discharged into the atmosphere through the first chimney 11.
另外，来自热风炉10的高温烟气在闪速煅烧单元6的高温烟气炉膛67与煅烧反应螺旋管65内的物料进行换热后，经由高温烟气炉膛67的高温烟气出口68输送到干燥单元1，以为干燥单元1提供烘干热源，实现热能的充分利用，在干燥单元1中完成干燥任务的烟气随后进入第二烟气处理单元29，经第二烟气处理单元29处理后经由第二烟囱21排放出去。In addition, the high-temperature flue gas from the hot blast stove 10 exchanges heat between the high-temperature flue gas furnace 67 of the flash calcination unit 6 and the material in the calcination reaction spiral tube 65, and then is sent to the high-temperature flue gas outlet 68 of the high-temperature flue gas furnace 67 to The drying unit 1 provides a drying heat source for the drying unit 1 to realize the full use of heat energy. The flue gas that completes the drying task in the drying unit 1 then enters the second flue gas processing unit 29 and is processed by the second flue gas processing unit 29 It is discharged through the second chimney 21.
需要说明的是,尽管以电石渣粉料煅烧为例说明了第一煅烧反应的温度为750℃左右,第二煅烧反应的温度为900℃以上,但应当理解的是,本发明的***和方法并不限于煅烧电石渣粉料,还可以用于煅烧碱式碳酸锌、氢氧化铝等,只是在煅烧碱式碳酸锌、氢氧化铝等时,第一煅烧反应和第二煅烧反应的温度根据煅烧的粉料的不同而作出相应地调整即可。It should be noted that although the calcination of calcium carbide slag powder is taken as an example to illustrate that the temperature of the first calcination reaction is about 750°C and the temperature of the second calcination reaction is above 900°C, it should be understood that the system and method of the present invention It is not limited to calcined calcium carbide slag powder, but can also be used for calcining basic zinc carbonate, aluminum hydroxide, etc., but when calcining basic zinc carbonate, aluminum hydroxide, etc., the temperature of the first calcination reaction and the second calcination reaction is based on The calcined powder may be adjusted accordingly.
本发明的技术内容及技术特点已揭示如上，然而可以理解，在本发明的创作思想下，本领域的技术人员可以对上述结构作各种变化和改进，包括这里单独披露的或要求保护的技术特征的组合，以及明显地包括这些特征的其它组合。这些变形和/或组合均落入本发明所涉及的技术领域内，并落入本发明权利要求的保护范围。The technical content and technical characteristics of the present invention have been disclosed as above, but it can be understood that, under the creative idea of the present invention, those skilled in the art can make various changes and improvements to the above-mentioned structure, including the technology disclosed separately or claimed here Combinations of features, and other combinations that obviously include these features. These variations and/or combinations all fall within the technical field of the present invention and fall within the protection scope of the claims of the present invention.
Claims (9)
- 一种双热源旋流闪速煅烧***，包括依次连接的粉体原料烘干用干燥单元、下料料仓、变频控制的旋转供料器、文丘里供料器、闪速煅烧单元、旋风二次加热物料收集单元，和分别与旋风二次加热物料收集单元连接的物料冷却单元和第一烟气处理单元，其中，还包括热风炉，该热风炉一路连接闪速煅烧单元的高温烟气入口以在闪速煅烧单元内完成第一煅烧反应，另一路连接闪速煅烧单元的物料出口以再次加热物料从而在旋风二次加热物料收集单元内完成第二煅烧反应，并且，文丘里供料器还连接有气力输送单元以将粉体原料以气固混合物的形式送入闪速煅烧单元，物料冷却单元还连接有底部锥斗。A dual heat source cyclone flash calcination system, including a drying unit for drying powder raw materials connected in sequence, a feed silo, a frequency-controlled rotary feeder, a venturi feeder, a flash calcination unit, and a cyclone II The secondary heating material collection unit, and the material cooling unit and the first flue gas processing unit respectively connected to the cyclone secondary heating material collection unit, which also include a hot air furnace, which is connected to the high temperature flue gas inlet of the flash calcination unit all the way In order to complete the first calcination reaction in the flash calcination unit, another way is connected to the material outlet of the flash calcination unit to reheat the material to complete the second calcination reaction in the cyclone secondary heating material collection unit, and the Venturi feeder A pneumatic conveying unit is also connected to feed the powder raw materials into the flash calcination unit in the form of a gas-solid mixture, and the material cooling unit is also connected to a bottom cone funnel.
- 根据权利要求1所述的双热源旋流闪速煅烧***，其特征在于，所述第一煅烧反应为氢氧化钙分解反应，所述第二煅烧反应为碳酸钙分解反应。The dual heat source swirl flash calcination system according to claim 1, wherein the first calcination reaction is a calcium hydroxide decomposition reaction, and the second calcination reaction is a calcium carbonate decomposition reaction.
- 根据权利要求1或2所述的双热源旋流闪速煅烧***，其特征在于，所述闪速煅烧单元具有煅烧反应螺旋管和围绕该煅烧反应螺旋管的高温烟气炉膛，该煅烧反应螺旋管具有与所述文丘里供料器连接的物料入口和所述物料出口，该高温烟气炉膛具有所述高温烟气入口从而使得该煅烧反应螺旋管内的物料能够和高温烟气炉膛内的高温烟气进行间接换热。The dual heat source cyclone flash calcination system according to claim 1 or 2, characterized in that the flash calcination unit has a calcination reaction spiral tube and a high-temperature flue gas furnace surrounding the calcination reaction spiral tube, the calcination reaction spiral The tube has a material inlet and a material outlet connected to the venturi feeder, the high-temperature flue gas furnace has the high-temperature flue gas inlet so that the material in the calcination reaction spiral tube can meet the high temperature in the high-temperature flue gas furnace Flue gas undergoes indirect heat exchange.
- 根据权利要求3所述的双热源旋流闪速煅烧***，其特征在于，所述热风炉的所述另一路具有热风喷口，该热风喷口与所述物料出口设置成方向一致，所述旋风二次加热物料收集单元设置有物料切向入口。The dual heat source cyclone flash calcination system according to claim 3, characterized in that the other path of the hot blast furnace has a hot blast nozzle, the hot blast nozzle and the material outlet are arranged in the same direction, the cyclone two The secondary heating material collection unit is provided with a material tangential inlet.
- 根据权利要求3所述的双热源旋流闪速煅烧***，其特征在于，所述闪速煅烧单元的所述高温烟气炉膛的内壁上设置有折流板结构。The dual heat source swirl flash calcination system according to claim 3, characterized in that a baffle structure is provided on the inner wall of the high temperature flue gas furnace of the flash calcination unit.
- 根据权利要求1或2所述的双热源旋流闪速煅烧***，其特征在于，所述闪速煅烧单元还与所述干燥单元连接以向所述干燥单元提供烘干热源。The dual heat source swirl flash calcination system according to claim 1 or 2, wherein the flash calcination unit is further connected to the drying unit to provide a drying heat source to the drying unit.
- 根据权利要求6所述的双热源旋流闪速煅烧***，其特征在于，所述干燥单元还连接有烟囱。The dual heat source swirl flash calcination system according to claim 6, wherein the drying unit is further connected with a chimney.
- 一种利用根据权利要求1所述的双热源旋流闪速煅烧***进行粉体原料煅烧的双热源旋流闪速煅烧方法，其特征在于包括如下步骤：A dual-heat source cyclone flash calcination method using the dual-heat source cyclone flash calcination system according to claim 1, characterized in that it includes the following steps:1)将未烘干的电石渣粉料送入干燥单元进行干燥以生成电石渣干粉；1) Send the un-dried calcium carbide slag powder to the drying unit for drying to produce calcium carbide slag dry powder;2)电石渣干粉进入下料料仓，并通过变频控制的旋转供料器送入文丘里供料器；2) The dry powder of calcium carbide slag enters the feeding silo, and is fed into the venturi feeder through the rotary feeder controlled by frequency conversion;3)通过气力输送单元向文丘里供料器提供压缩空气作为输送空气将电石渣干粉输送至闪速煅烧单元，通过气力输送的电石渣干粉在闪速煅烧单元内与来自热风炉的高温烟气进行间接换热，进行一次煅烧完成氢氧化钙分解反应并生成气固混合物；3) Compressed air is supplied to the venturi feeder as pneumatic air through the pneumatic conveying unit to convey the calcium carbide slag dry powder to the flash calcination unit. The pneumatic calcium slag dry powder is conveyed in the flash calcining unit and the high-temperature flue gas from the hot air furnace Perform indirect heat exchange, perform calcination once to complete the decomposition reaction of calcium hydroxide and generate gas-solid mixture;4)一次煅烧后的气固混合物离开闪速煅烧单元并与来自热风炉的另一路高温烟气混合加热，进入旋风二次加热物料收集单元进行二次煅烧完成碳酸钙分解反应，同时对二次煅烧后的气固混合物进行气固分离；4) The gas-solid mixture after the primary calcination leaves the flash calcination unit and is mixed and heated with another high-temperature flue gas from the hot air furnace, and enters the cyclone secondary heating material collection unit for secondary calcination to complete the calcium carbonate decomposition reaction. The gas-solid mixture after calcination is subjected to gas-solid separation;5)气固分离后的粉料经物料冷却单元冷却后由底部锥斗收集，同时气固分离后的二次煅烧烟气经收尘后排放。5) The powder material after the gas-solid separation is cooled by the material cooling unit and collected by the bottom cone funnel, and the secondary calcined flue gas after the gas-solid separation is discharged after collecting dust.
- 根据权利要求8所述的双热源旋流闪速煅烧方法，其特征在于，在所述步骤3)中，电石渣干粉以切向形式进入闪速煅烧单元，在闪速煅烧单元内通过输送空气的带动以旋流的方式从由上向下运动，并在700～800℃的温度范围内进行一次煅烧脱去其中氢氧化钙的H2O而生成氧化钙；在所述步骤4)中，二次煅烧在900℃以上进行，脱去物料中碳酸钙的CO2生成氧化钙。The dual heat source cyclone flash calcination method according to claim 8, characterized in that in the step 3), the calcium carbide slag dry powder enters the flash calcination unit in a tangential form, and the air is transported through the flash calcination unit It is driven in a swirling manner from top to bottom, and is calcined once in the temperature range of 700-800°C to remove the H2O of calcium hydroxide to generate calcium oxide; in the step 4), twice The calcination is carried out above 900°C to remove the CO2 of calcium carbonate in the material to produce calcium oxide.
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| CN201811630252.7A CN111380359A (en) | 2018-12-29 | 2018-12-29 | Double-heat-source rotational flow flash calcination system and double-heat-source rotational flow flash calcination method |
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| CN115638656A (en) * | 2022-10-21 | 2023-01-24 | 济源市鲁泰纳米材料有限公司 | Low-energy-consumption integrated flash evaporation roasting system for producing nano zinc oxide |
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