Binary rotary-flotation calcination production system and process special for building material powder

Abstract

The embodiment of the invention discloses a special binary rotary-floating calcining production system and process for building material powder. The system comprises a raw material bin, a transition material bin, at least two preheating cyclone separators, a unitary rotary-floating calcining furnace, a binary rotary-floating calcining furnace, a high-temperature recycling cyclone separator, a high-temperature material bin, conveying metering equipment, a pulse bag type dust collector, a spiral feeder, an induced draft fan, a tail gas pipe, a metering device, a combustor and the like. Through four core innovations of graded calcining of the double calcining furnaces, gradient utilization of waste heat, parameter decoupling regulation and control and dynamic adjustment of raw material activity / burning reduction, the existing bottleneck of the rotary floating calcining process is systematically solved, product diversification, quality controllability, energy consumption minimization and cost optimization are realized, and a key technical scheme is provided for green and low-carbon development of the building material industry.

Description

Technical Field

[0001] This invention relates to the field of building material powder production technology, specifically to a binary vortex flotation calcination production system and process for building material powder. Background Technology

[0002] Currently, the production of building material powders mostly adopts the rotary flotation calcination process. This process is widely used in the preparation of inorganic materials such as calcium oxide and magnesium oxide due to its advantages such as high material heat transfer efficiency and good reaction uniformity. However, the existing rotary flotation calcination process still has some problems, as follows.

[0003] 1. The final products obtained by the traditional rotary flotation calcination process (such as raw meal powder) usually have high activity (such as active calcium oxide content). Although this high activity characteristic is suitable for fields such as cement that require rapid hydration reaction, it cannot meet the needs of some engineering scenarios for low-activity building material powder (such as retarder materials, refractory materials, etc.), which limits the application scenarios and market adaptability of the products.

[0004] 2. From raw materials to products, there will be significant loss on calcination during the cyclone calcination process, but the existing cyclone calcination system cannot adjust the loss on calcination ratio.

[0005] 3. In the current swirl flotation calcination system, the adjustment range of key parameters such as calcination temperature and material residence time is limited, and the coupling relationship between the parameters is complex.

[0006] 4. The swirl calcination process is accompanied by the emission of a large amount of high-temperature flue gas. Although a waste heat recovery system is provided, the existing waste heat recovery system usually only uses a simple heat exchanger to perform primary cooling of the flue gas, and can only recover about 30%-40% of the waste heat. The remaining heat is discharged into the environment with the waste gas, resulting in a large amount of sensible heat or latent heat not being fully recovered and utilized, and the energy consumption per unit product is high.

[0007] The aforementioned technical deficiencies have resulted in significant bottlenecks for the existing vortex calcination process in adapting to diversified product demands and improving energy efficiency. Especially in the context of the green and low-carbon transformation of the building materials industry, developing a vortex calcination technology that can flexibly control product activity and achieve deep waste heat recovery has become a key issue in promoting the industry's technological upgrading. Summary of the Invention

[0008] Therefore, embodiments of the present invention provide a binary vortex flotation calcination production system and process for building material powder with adjustable product activity, adjustable calcination reduction, controllable calcination temperature, diversified products, stable product quality, full recovery of waste heat, low energy consumption, and low production cost, in order to solve one or more of the above-mentioned technical problems.

[0009] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0010] The first aspect of the present invention provides a binary cyclone flotation calcination production system for building material powder, including a raw material silo, a transition silo, at least two preheating cyclone separators, a uni-cyclone flotation calcination furnace, a binary cyclone flotation calcination furnace, a high-temperature recovery cyclone separator, and a high-temperature silo.

[0011] The air outlet of the binary cyclone calcining furnace is connected to the air inlet of the high-temperature recovery cyclone separator via an air duct. The air outlet of the high-temperature recovery cyclone separator is connected to the air inlet of the uni-cyclone calcining furnace via an air duct. The air outlet of the uni-cyclone calcining furnace is connected to the air inlet of the secondary preheating cyclone separator via an air duct. The air outlet of the secondary preheating cyclone separator is connected to the air inlet of the primary preheating cyclone separator via an air duct.

[0012] The discharge port of the raw material silo is connected to the inlet of the transition silo via a conveying and metering device. The discharge port of the primary preheating cyclone separator is connected to the inlet of the unary cyclone calcining furnace via a material pipe. The discharge port of the secondary preheating cyclone separator is connected to the inlet of the binary cyclone calcining furnace via a material pipe. The discharge port of the high-temperature recovery cyclone separator is connected to the inlet of the high-temperature silo via a material pipe. The discharge port of the transition silo is connected to the air duct connecting the air outlet of the secondary preheating cyclone separator and the air inlet of the primary preheating cyclone separator via a material pipe.

[0013] The high-temperature silo has a heat preservation function, and the product activity can be adjusted by controlling the heat preservation time of the product transported from the high-temperature recovery cyclone separator to the high-temperature silo.

[0014] Furthermore, the binary cyclone flotation calcination production system for building material powder also includes a pulse bag filter. The outlet of the primary preheating cyclone separator is connected to the inlet of the pulse bag filter through a duct. The outlet of the conveying and metering equipment is connected to the duct between the outlet of the primary preheating cyclone separator and the inlet of the pulse bag filter through a material pipe.

[0015] Furthermore, the discharge port of the pulse bag filter is connected to a screw feeder, and the discharge port of the screw feeder is connected to the inlet of the transition hopper through a material pipe.

[0016] Furthermore, the binary cyclone calcination production system for building material powder also includes an induced draft fan and an exhaust gas pipe. The outlet of the pulse bag filter is connected to the inlet of the induced draft fan through a duct, and the inlet of the induced draft fan is connected to the inlet of the exhaust gas pipe through a duct. The exhaust gas pipe is vertically arranged, with its upper end serving as the outlet. The exhaust gas is purified through the pulse bag filter and cyclone separator, reducing environmental pollution.

[0017] Furthermore, the binary cyclone calcination production system for building material powder also includes a metering device. The discharge port of the transition silo is connected to two feed pipes. One feed pipe is used to supply material to the primary preheating cyclone separator, and the other feed pipe is connected to the inlet of the metering device. The outlet of the metering device is then connected to the inlet of the high-temperature silo through another feed pipe. By controlling the start and stop of the metering device, the distribution ratio of raw material supplied to the cyclone calcination furnace or directly transported to the high-temperature silo can be adjusted to achieve calcination reduction regulation.

[0018] Furthermore, the binary vortex calcination production system for building material powder also includes a burner, which is installed at the air inlet of the binary vortex calcination furnace. The fuel inlet of the burner is connected to a natural gas pipeline and a coal gas pipeline. The calcination temperature is controlled by controlling the intake ratio of natural gas, coal gas, and auxiliary combustion gas.

[0019] A second aspect of this invention provides a binary vortex flotation calcination production process for building material powder, which employs the aforementioned binary vortex flotation calcination production system for building material powder, comprising:

[0020] A gas path is established; natural gas, coal gas, and combustion-supporting gas are supplied to the burner according to a set ratio. The combustion of the mixed gas produces a large amount of high-temperature flue gas. The calcination temperature is adjusted by regulating the ratio of the mixed gas. Under the negative pressure of the induced draft fan, the high-temperature flue gas passes sequentially through a binary cyclone calciner, a high-temperature recovery cyclone separator, a single cyclone calciner, a secondary preheating cyclone separator, a primary preheating cyclone separator, a pulse bag filter, an induced draft fan, and a tail gas pipe, establishing a flue gas passage and realizing the cascade utilization of heat.

[0021] Feeding and drying: The raw materials in the raw material silo are conveyed to the air outlet duct of the primary preheating cyclone separator by the conveying and metering equipment. Under the action of the airflow, the raw materials are immediately dispersed, floated in the airflow and enter the pulse bag dust collector. The waste heat of the airflow is used to heat and dry the raw materials, realizing the final stage waste heat utilization of high-temperature flue gas. The dust in the raw materials is discharged from the air outlet of the pulse bag dust collector.

[0022] Dry raw material distribution: The dry raw material collected by the pulse bag filter is fed into the transition silo by the screw feeder for temporary storage. The dry raw material temporarily stored in the transition silo is transported to the metering device for metering and the first-stage preheating cyclone separator for primary preheating through two material pipes. The metering device delivers a set amount of uncalcined dry raw material to the high-temperature silo. The burning reduction is adjusted by controlling the ratio of calcined and uncalcined raw materials.

[0023] Primary preheating and single-element cyclone calcination: The dried raw material transported from the transition silo enters the outlet duct of the secondary preheating cyclone separator. Under the action of the airflow, the dried material is immediately dispersed and swirled in the airflow and enters the primary preheating cyclone separator. The waste heat of the airflow is used to preheat the dried raw material in the primary stage, realizing the secondary waste heat utilization of the high-temperature flue gas. The preheated material after primary preheating is discharged from the outlet of the primary preheating cyclone separator and enters the single-element cyclone calcination furnace. The preheated material undergoes single-element cyclone calcination in the single-element cyclone calcination furnace to form the primary calcined product.

[0024] Two-stage preheating and binary cyclone calcination: The primary calcined product, conveyed from the uni-stage cyclone calcination furnace, enters the secondary preheating cyclone separator, where the waste heat of the airflow is used to preheat the primary calcined product, realizing the primary waste heat utilization of high-temperature flue gas; the preheated primary calcined product after secondary preheating is discharged from the outlet of the secondary preheating cyclone separator and enters the binary cyclone calcination furnace, where the preheated primary calcined product undergoes binary cyclone calcination to obtain the secondary calcined product;

[0025] High-temperature cyclone separation: The secondary calcined products conveyed from the binary cyclone calcining furnace enter the high-temperature recovery cyclone separator. The separated secondary calcined products are discharged from the outlet of the high-temperature recovery cyclone separator and enter the high-temperature silo.

[0026] Activity regulation: As the secondary calcined product enters the high-temperature silo, the transition silo delivers a set amount of uncalcined dry material to the high-temperature silo through a metering device. The mixture is kept at a temperature in the high-temperature silo for a preset holding time to regulate the product activity.

[0027] Furthermore, the initial temperature of the high-temperature flue gas generated by the combustion of the mixed gas is 1250-1450℃. After participating in calcination in the binary swirl calcination furnace, it is cooled down to the upper limit of 900℃. After participating in calcination in the unary swirl calcination furnace, it is cooled down to the upper limit of 450℃.

[0028] Furthermore, the raw material temperature in the raw material silo is room temperature, and the upper limit of the temperature of the dried raw material formed after heating and drying does not exceed 450℃.

[0029] Furthermore, during the cyclone calcination process, a set amount of specific reagents is added to the single-element cyclone calcination furnace and / or the binary cyclone calcination furnace as needed to purify and remove impurities from the product.

[0030] The embodiments of the present invention have the following advantages:

[0031] 1. Flexible control of product activity breaks through the limitations of a single application scenario, and breaks the single output mode of high-activity products in traditional processes, significantly expanding the application fields and market adaptability of building material powder.

[0032] 2. The adjustable calorific value ratio allows the same production line to produce building material powders with different calorific value characteristics, significantly improving the flexibility of the process and the diversity of products.

[0033] 3. Optimized control decouples the complex relationships between parameters such as temperature and time, expands the adjustable range, and improves the stability and controllability of the process.

[0034] 4. Deep waste heat recovery significantly reduces production costs and carbon emissions, meeting the industry's green transformation needs.

[0035] 5. Achieve stable quality and low-cost production, realizing "high quality, low energy consumption, and low cost" production, promoting industrial upgrading, and providing technical support for the low-carbon transformation of the building materials industry.

[0036] 6. Enhance process adaptability.

[0037] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0038] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0039] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0040] Figure 1 This is a schematic diagram of a binary vortex flotation calcination production system for building material powder, provided in an embodiment of the present invention.

[0041] In the diagram: 1. Raw material silo; 2. Transition silo; 3. Primary preheating cyclone separator; 4. Secondary preheating cyclone separator; 5. Uni-element cyclone calcining furnace; 6. Binary cyclone calcining furnace; 7. High-temperature recovery cyclone separator; 8. High-temperature silo; 9. Conveying and metering equipment; 10. Pulse bag filter; 11. Screw feeder; 12. Exhaust fan; 13. Exhaust pipe; 14. Metering device; 15. Burner. Detailed Implementation

[0042] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] like Figure 1 As shown, this embodiment provides a binary cyclone flotation calcination production system for building material powder, including a raw material silo 1, a transition silo 2, at least two preheating cyclone separators (a primary preheating cyclone separator 3 and a secondary preheating cyclone separator 4), a uniaxial cyclone flotation calcination furnace 5, a binary cyclone flotation calcination furnace 6, a high-temperature recovery cyclone separator 7, a high-temperature silo 8, a conveying and metering device 9, a pulse bag filter 10, a screw feeder 11, an induced draft fan 12, a tail gas pipe 13, a metering device 14, and a burner 15, etc.

[0044] Burner 15 is installed at the air inlet of the binary cyclone calciner 6. The fuel inlet of burner 15 is connected to a natural gas pipeline and a coal gas pipeline. The calcination temperature is controlled by adjusting the intake ratio of natural gas, coal gas, and auxiliary combustion gas. The air outlet of the binary cyclone calciner 6 is connected to the air inlet of the high-temperature recovery cyclone separator 7 via a duct. The air outlet of the high-temperature recovery cyclone separator 7 is connected to the air inlet of the unary cyclone calciner 5 via a duct. The air outlet of the unary cyclone calciner 5 is connected to the air inlet of the secondary preheating cyclone separator 4 via a duct. The air outlet of the secondary preheating cyclone separator 4 is connected to the air inlet of the primary preheating cyclone separator 3 via a duct. The air outlet of the primary preheating cyclone separator 3 is connected to the air inlet of the pulse bag filter 10 via a duct. The air outlet of the pulse bag filter 10 is connected to the air inlet of the induced draft fan 12 via a duct. The air inlet of the induced draft fan 12 is connected to the air inlet of the exhaust pipe 13 via a duct. The exhaust pipe 13 is vertically arranged with the air inlet at the bottom and the air outlet at the top. The exhaust gas is purified by the pulse bag filter 10 and the cyclone separator, reducing environmental pollution.

[0045] The discharge port of raw material silo 1 is connected to conveying and metering equipment 9. The discharge port of conveying and metering equipment 9 is connected to the air duct between the outlet of the primary preheating cyclone separator 3 and the inlet of the pulse bag filter 10 via a material pipe, thus achieving connection with the inlet (feed port) of the pulse bag filter 10. The discharge port of the pulse bag filter 10 is connected to a screw feeder 11, and the discharge port of the screw feeder 11 is connected to the feed port of transition silo 2 via a material pipe. The discharge port of transition silo 2 is connected to two material pipes. One material pipe is used to feed material to the primary preheating cyclone separator 3 (connected to the air duct between the outlet of the secondary preheating cyclone separator 4 and the inlet of the primary preheating cyclone separator 3 via the material pipe), and the other material pipe is connected to the feed port of metering device 14. The discharge port of the primary preheating cyclone separator 3 is connected to the feed port of the single-element cyclone calcining furnace 5 via a material pipe. The outlet of the secondary preheating cyclone separator 4 is connected to the inlet of the binary cyclone calcining furnace 6 via a feed pipe. The outlet of the high-temperature recovery cyclone separator 7 is connected to the inlet of the high-temperature silo 8 via a feed pipe. The outlet of the metering device 14 is also connected to the inlet of the high-temperature silo 8 via another feed pipe; by controlling the start and stop of the metering device 14, the distribution ratio of raw materials supplied to the cyclone calcining furnace or directly fed to the high-temperature silo 8 is adjusted to achieve calcination reduction regulation. The high-temperature silo 8 is connected to the next process equipment via a feed pipe. The high-temperature silo 8 is an additional piece of equipment with a heat preservation function; the product activity is adjusted by controlling the heat preservation time of the product transported from the high-temperature recovery cyclone separator 7 to the high-temperature silo 8.

[0046] This embodiment also provides a binary vortex flotation and calcination production process for building material powder, which adopts the binary vortex flotation and calcination production system for building material powder described in the above embodiment, and includes the following steps:

[0047] Step S1: Establish the gas path. Natural gas, coal gas, and combustion-supporting gas are supplied to burner 15 according to a set ratio. The combustion of the mixed gas produces a large amount of high-temperature flue gas (exemplarily, the initial temperature of the high-temperature flue gas is 1250-1450℃). The calcination temperature is adjusted by regulating the ratio of the mixed gas. Under the negative pressure of the induced draft fan 12, the high-temperature flue gas passes sequentially through the binary cyclone calciner 6, the high-temperature recovery cyclone separator 7, the unary cyclone calciner 5, the secondary preheating cyclone separator 4, the primary preheating cyclone separator 3, the pulse bag filter 10, the induced draft fan 12, and the tail gas pipe 13, establishing a flue gas passage and realizing the cascade utilization of heat.

[0048] Step S2: Feeding and drying. The raw materials in the raw material silo 1 are conveyed to the outlet duct of the primary preheating cyclone separator 3 via the conveying and metering equipment 9. Under the action of the airflow, the raw materials are immediately dispersed, floated in the airflow, and enter the pulse bag filter 10. The waste heat of the airflow is used to heat and dry the raw materials, realizing the final stage waste heat utilization of high-temperature flue gas. The dust in the raw materials is discharged from the outlet of the pulse bag filter 10.

[0049] Step S3, distribution of dried raw materials. The dried raw materials collected by the pulse bag filter 10 are fed into the transition silo 2 via the screw conveyor 11 for temporary storage. The dried raw materials temporarily stored in the transition silo 2 are conveyed through two feed pipes to the metering device 14 for metering and to the primary preheating cyclone separator 3 for primary preheating. The metering device 14 delivers a set amount of uncalcined dried raw materials to the high-temperature silo 8, and the calcination reduction is adjusted by controlling the ratio of calcined and uncalcined raw materials. For example, the temperature of the raw materials in the raw material silo 1 is room temperature (e.g., 25°C), and the upper limit of the temperature of the dried raw materials formed after heating and drying does not exceed 450°C.

[0050] Step S4: Primary preheating and single-element cyclone calcination. The dried raw material from the transition silo 2 enters the outlet duct of the secondary preheating cyclone separator 4. Under the action of the airflow, the dried material immediately disperses and floats in the airflow before entering the primary preheating cyclone separator 3. The waste heat of the airflow is used for primary preheating of the dried raw material, achieving secondary waste heat utilization of the high-temperature flue gas. The preheated material is discharged from the outlet of the primary preheating cyclone separator 3 and enters the single-element cyclone calcination furnace 5. The preheated material undergoes single-element cyclone calcination in the furnace 5 to form the first-element calcined product. For example, after calcination in the furnace 5, the flue gas temperature is reduced to a maximum of 450°C. Generally, during the cyclone calcination process, a set amount of specific reagent is added to the furnace 5 as needed to purify and remove impurities from the product.

[0051] Step S5: Secondary preheating and binary cyclone calcination. The primary calcined product from the unary cyclone calcination furnace 5 enters the secondary preheating cyclone separator 4, where the waste heat of the airflow is used for secondary preheating, realizing the primary utilization of the high-temperature flue gas's waste heat. The preheated primary calcined product is discharged from the outlet of the secondary preheating cyclone separator 4 and enters the binary cyclone calcination furnace 6. The preheated primary calcined product undergoes binary cyclone calcination in the binary cyclone calcination furnace 6 to obtain the secondary calcined product. Exemplarily, after calcination in the binary cyclone calcination furnace 6, the flue gas temperature is reduced to a maximum of 900°C. Generally, during the cyclone calcination process, a set amount of specific reagent is added to the binary cyclone calcination furnace 6 as needed to purify and remove impurities from the product.

[0052] Step S6, high-temperature cyclone separation: The secondary calcined product conveyed from the binary cyclone calcining furnace 6 enters the high-temperature recovery cyclone separator 7, and the separated secondary calcined product is discharged from the outlet of the high-temperature recovery cyclone separator 7 and enters the high-temperature silo 8.

[0053] In addition, as the secondary calcined products enter the high-temperature silo 8, the transition silo 2 delivers a set amount of uncalcined dry material to the high-temperature silo 8 through the metering device 14. The mixture is kept in the high-temperature silo 8 for a preset holding time to adjust the product activity.

[0054] The binary vortex flotation calcination production system and process for building material powder provided by this invention addresses the shortcomings of existing vortex flotation calcination technologies, such as unadjustable product activity, fixed calcination loss ratio, high energy consumption, and low waste heat recovery efficiency. Through innovative design, it effectively solves the key problems mentioned in the background technology and achieves the following significant technical advantages:

[0055] 1. Flexible adjustment of product activity, breaking through the limitations of a single application scenario.

[0056] A high-temperature silo insulation mechanism is employed to regulate product activity. Specifically, by controlling the insulation time of the calcined product (such as raw meal powder) in the high-temperature silo, the content of its active oxides (such as active calcium oxide) can be adjusted. Extending the insulation time reduces product activity, while shortening the insulation time increases it, thereby achieving "adjustable" control over product activity to meet the needs of special applications such as retarders and refractory materials.

[0057] The activity of the product is adjusted by a mixing and regulation mechanism using uncalcined raw materials. Specifically, uncalcined dried raw materials are mixed into a high-temperature silo in a certain proportion using a metering device to further dilute the activity of the highly active calcined product, thereby flexibly adapting to the activity requirements of different engineering scenarios.

[0058] Results: It breaks the traditional single output mode of high-activity products and significantly expands the application fields and market adaptability of building material powder.

[0059] 2. The sintering ratio is adjustable, which enhances product diversity and process flexibility.

[0060] The raw material distribution and adjustment mechanism regulates the loss on calcination. Specifically, a portion of the uncalcined raw material is directly fed into the high-temperature silo via a metering device in the transition silo, while the remaining raw material enters the calcination process. By controlling the start and stop of the metering device and the distribution ratio (such as the proportion of uncalcined raw material), the loss on calcination of the final product can be dynamically adjusted.

[0061] The synergistic effect of the two calcining furnaces regulates scorch reduction. Specifically, the two-stage calcination process of the uni-stage swirl flotation calcining furnace and the binary swirl flotation calcining furnace, combined with different calcination temperatures and residence times, further optimizes the precision of scorch reduction control.

[0062] Effect: The adjustable calorific value ratio allows the same production line to produce building material powders with different calorific value characteristics, significantly improving the flexibility of the process and the diversity of products.

[0063] 3. Optimize control to improve production stability and efficiency.

[0064] Dual combustion system and fuel ratio regulation. Specifically, the burner can precisely control the initial high temperature of the binary swirl-float calciner by the mixing ratio of natural gas, coal gas, and auxiliary combustion gas, and the temperature regulation range is wider.

[0065] Staged calcination and cascaded utilization of waste heat. Specifically, the calcination temperature is controlled in stages by connecting a single-stage cyclone calciner and a binary cyclone calciner in series; at the same time, the multi-stage waste heat utilization of the preheating cyclone separator and the high-temperature recovery system allows for independent adjustment of the residence time of materials in each stage.

[0066] Results: It decouples the complex relationships between parameters such as temperature and time, expands the adjustable range, and improves the stability and controllability of the process.

[0067] 4. Deep waste heat recovery significantly reduces energy consumption and carbon emissions.

[0068] The flue gas cascade utilization system improves thermal energy utilization efficiency. Specifically, high-temperature flue gas passes through a binary cyclone calciner, a single cyclone calciner, and a two-stage preheating cyclone separator, and finally passes through a pulse bag filter for final drying of the raw materials, achieving four-stage cascade utilization of heat.

[0069] The dust removal system works in conjunction with drying to improve thermal energy utilization. Specifically, the pulse-jet bag filter not only recovers dust but also utilizes the waste heat of flue gas to pre-dry raw materials, avoiding additional energy consumption.

[0070] The system features a closed-loop design to improve thermal energy utilization. Specifically, the flue gas passage forms a closed loop, and the high-temperature flue gas is discharged through the induced draft fan after multiple heat exchanges, further recovering latent heat (such as the condensation heat of water vapor).

[0071] Expected results: Waste heat recovery rate is expected to increase to over 60%, unit product energy consumption will be reduced by 30%-50%, significantly reducing production costs and carbon emissions, meeting the industry's green transformation needs.

[0072] 5. Stable quality and low-cost production drive industrial upgrading.

[0073] Improve quality stability. Specifically, through the synergy of dual calcining furnaces, precise temperature control, and tiered utilization of waste heat, uniform heat transfer and full reaction of materials are ensured, reducing the fluctuation range of product activity, loss on ignition, and other indicators, thus significantly improving quality stability.

[0074] Reduce costs. Specifically, deep waste heat recovery reduces fuel consumption; pulse bag filters and screw feeders enable dust recovery and reuse, reducing raw material waste; flexible activation / burning control reduces customized production costs.

[0075] Results: The system as a whole achieves "high quality, low energy consumption, and low cost" production, providing technical support for the low-carbon transformation of the building materials industry.

[0076] 6. Enhance process adaptability.

[0077] During the calcination process, specific agents (such as modifiers and slow-release agents) are added as needed to further regulate product performance (such as enhancing refractoriness and adjusting hydration rate). This expands the system's customized production capacity for specialty building material powders and enhances its market competitiveness.

[0078] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A binary vortex flotation calcination production system for building material powder, characterized in that, It includes a raw material silo (1), a transition silo (2), at least two preheating cyclone separators, a single-element cyclone calciner (5), a binary cyclone calciner (6), a high-temperature recovery cyclone separator (7), and a high-temperature silo (8); The air outlet of the binary cyclone calciner (6) is connected to the air inlet of the high-temperature recovery cyclone separator (7) through an air duct. The air outlet of the high-temperature recovery cyclone separator (7) is connected to the air inlet of the unary cyclone calciner (5) through an air duct. The air outlet of the unary cyclone calciner (5) is connected to the air inlet of the secondary preheating cyclone separator (4) through an air duct. The air outlet of the secondary preheating cyclone separator (4) is connected to the air inlet of the primary preheating cyclone separator (3) through an air duct. The outlet of the raw material silo (1) is connected to the inlet of the transition silo (2) through the conveying and metering device (9). The outlet of the primary preheating cyclone separator (3) is connected to the inlet of the unary cyclone calcining furnace (5) through the material pipe. The outlet of the secondary preheating cyclone separator (4) is connected to the inlet of the binary cyclone calcining furnace (6) through the material pipe. The outlet of the high-temperature recovery cyclone separator (7) is connected to the inlet of the high-temperature silo (8) through the material pipe. The outlet of the transition silo (2) is connected to the air duct connecting the air outlet of the secondary preheating cyclone separator (4) and the air inlet of the primary preheating cyclone separator (3) through the material pipe.

2. The binary vortex flotation calcination production system for building material powder as described in claim 1, characterized in that, It also includes a pulse bag filter (10), the outlet of the primary preheating cyclone separator (3) is connected to the inlet of the pulse bag filter (10) through a duct, and the outlet of the conveying and metering device (9) is connected to the duct between the outlet of the primary preheating cyclone separator (3) and the inlet of the pulse bag filter (10) through a material pipe.

3. The binary vortex flotation calcination production system for building material powder as described in claim 2, characterized in that, The discharge port of the pulse bag filter (10) is connected to a screw feeder (11), and the discharge port of the screw feeder (11) is connected to the inlet of the transition silo (2) through a material pipe.

4. The binary vortex flotation calcination production system for building material powder as described in claim 2, characterized in that, It also includes an induced draft fan (12) and an exhaust pipe (13). The air outlet of the pulse bag filter (10) is connected to the air inlet of the induced draft fan (12) through a duct. The air inlet of the induced draft fan (12) is connected to the air inlet of the exhaust pipe (13) through a duct. The exhaust pipe (13) is vertically arranged, and its upper end is the air outlet.

5. The binary vortex flotation calcination production system for building material powder as described in claim 1, characterized in that, It also includes a metering device (14), the discharge port of the transition silo (2) is connected to two material pipes, one of which is used to supply material to the first-stage preheating cyclone separator (3), and the other material pipe is connected to the inlet of the metering device (14), and the outlet of the metering device (14) is connected to the inlet of the high-temperature silo (8) through a material pipe.

6. The binary vortex flotation calcination production system for building material powder as described in claim 1, characterized in that, It also includes a burner (15), which is installed at the air inlet of the binary vortex calcining furnace (6), and the fuel inlet of the burner (15) is connected to a natural gas pipeline and a coal gas pipeline.

7. A binary vortex flotation calcination production process for building material powder, characterized in that, The binary vortex flotation calcination production system for building material powder as described in any one of claims 1-6 includes: Establish a gas path; supply natural gas, coal gas and combustion-supporting gas to the burner (15) according to the set ratio. The combustion of the mixed gas produces a large amount of high-temperature flue gas. Under the negative pressure of the induced draft fan (12), the high-temperature flue gas passes through the binary cyclone calciner (6), the high-temperature recovery cyclone separator (7), the unary cyclone calciner (5), the secondary preheating cyclone separator (4), the primary preheating cyclone separator (3), the pulse bag filter (10), the induced draft fan (12) and the tail gas pipe (13) in sequence to establish a flue gas passage. Feeding and drying: The raw materials in the raw material silo (1) are conveyed to the air outlet duct of the primary preheating cyclone separator (3) by the conveying and metering equipment (9). Under the action of the airflow, the raw materials are immediately dispersed, floated in the airflow and enter the pulse bag dust collector (10). The dust in the raw materials is discharged from the air outlet of the pulse bag dust collector (10). Dry raw material distribution; the dry raw material collected by the pulse bag dust collector (10) is fed into the transition silo (2) by the screw feeder (11) for temporary storage. The dry raw material temporarily stored in the transition silo (2) is transported to the metering device (14) for metering and the first-stage preheating cyclone separator (3) for first-stage preheating by two material pipes. The metering device (14) delivers a set amount of uncalcined dry raw material to the high-temperature silo (8). First-stage preheating and single-element cyclone calcination: The dry raw material transported from the transition silo (2) enters the air outlet duct of the second-stage preheating cyclone separator (4). Under the action of the airflow, the dry material is immediately dispersed, swirled in the airflow and enters the first-stage preheating cyclone separator (3). The residual heat of the airflow is used to preheat the dry raw material in the first stage. The preheated material after the first stage preheating is discharged from the outlet of the first-stage preheating cyclone separator (3) and enters the single-element cyclone calcination furnace (5). The preheated material is calcined in the single-element cyclone calcination furnace (5) to form the first-stage calcined product. Secondary preheating and binary cyclone calcination: The primary calcined product delivered from the unary cyclone calcination furnace (5) enters the secondary preheating cyclone separator (4), and the residual heat of the airflow is used to preheat the primary calcined product in the secondary stage. The preheated primary calcined product after secondary preheating is discharged from the outlet of the secondary preheating cyclone separator (4) and enters the binary cyclone calcination furnace (6). The preheated primary calcined product is calcined in the binary cyclone calcination furnace (6) to obtain the secondary calcined product. High-temperature cyclone separation: The secondary calcined products transported from the binary cyclone calciner (6) enter the high-temperature recovery cyclone separator (7), and the separated secondary calcined products are discharged from the outlet of the high-temperature recovery cyclone separator (7) and enter the high-temperature silo (8).

8. The binary vortex flotation and calcination production process for building material powder as described in claim 7, characterized in that, The initial temperature of the high-temperature flue gas generated by the combustion of the mixed gas is 1250-1450℃. After participating in the calcination in the binary vortex calcining furnace (6), the temperature is reduced to the upper limit of 900℃. After participating in the calcination in the unary vortex calcining furnace (5), the temperature is reduced to the upper limit of 450℃.

9. The binary vortex flotation and calcination production process for building material powder as described in claim 7, characterized in that, The raw material temperature in the raw material silo (1) is room temperature, and the upper limit of the temperature of the dried raw material formed after heating and drying is no more than 450℃.

10. The binary vortex flotation and calcination production process for building material powder as described in claim 7, characterized in that, During the swirl flotation calcination process, a set amount of specific reagent is added to the unary swirl flotation calcination furnace (5) and / or the binary swirl flotation calcination furnace (6) as needed.

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