Solid mixture calcination system

Abstract

The present invention relates to the technical field of calcining manufacturing materials, and in particular to a solid mixture calcining system. The solid mixture calcining system includes a pipeline, an air intake valve, an air distribution device, a heat source supply furnace and a calcining furnace. The air intake valve is connected to the air distribution device through a pipeline, and the air distribution device is connected to the heat source supply furnace. The heat source supply furnace includes a plasma generator, and the plasma generator is used to ionize and heat the gas. The heat source supply furnace is connected to the calcining furnace. The air distribution device distributes the gas heated by the heat source supply furnace to the calcining furnace, so that the calcining furnace calcines the solid mixture. The calcining furnace is connected to the air distribution device through a pipeline, so that the gas generated after the calcining in the calcining furnace is continuously sent to the heat source supply furnace through the air distribution device. According to the solid mixture calcining system of the present invention, the gas circulates inside the pipeline, and the heat source supply furnace ionizes and heats the gas, which can realize the closed-loop self-circulation utilization of the gas, reduce resource waste and save costs.

Description

Technical Field

[0001] The invention relates to the technical field of calcining materials, in particular to a solid mixture calcining system. Background Art

[0002] In industrial production processes, especially in processes involving heat and chemical reactions, such as cement and lime calcination, a large amount of heat and gas produced by chemical reactions are usually discharged into the environment after use. These gases, such as carbon dioxide, nitrogen oxides, sulfides, etc., not only represent a waste of heat energy, but also cause pollution to the environment.

[0003] In the prior art, although various heat recovery systems have been developed to collect and reuse this heat energy, such as heat exchangers, waste heat boilers, etc., these systems often have problems such as low efficiency, high cost, and inability to fully utilize the chemical energy in the gas. In particular, in the prior art, the recycling of gases is usually not closed, which means that part of the gas will still escape during the circulation process, causing further waste of resources. At the same time, existing gas separation technologies, such as adsorption, washing, low-temperature separation and other methods, although they can separate useful gas components to a certain extent, are usually accompanied by high energy consumption and high operating costs. The application of these technologies is limited by their economy and environmental protection. Especially today, with increasingly stringent requirements for environmental protection, these methods can no longer fully meet the needs of industrial production.

[0004] Therefore, how to efficiently, economically and environmentally friendly realize the recycling of gases in industrial processes, especially how to realize the closed self-circulation of gases to minimize resource waste and reduce operating costs, has become an urgent need for the development of technology in this field. Summary of the invention

[0005] The purpose of the present invention is to at least solve the problem of how to improve the efficiency of gas recycling. This purpose is achieved through the following technical solutions:

[0006] The present invention provides a solid mixture calcining system, comprising:

[0007] Closable intake valve;

[0008] An air distribution device, the air distribution device is connected to the air intake valve through a pipeline;

[0009] A heat source supply furnace, wherein the heat source supply furnace comprises a plasma generator, and an air inlet of the heat source supply furnace is connected to the air distribution device, and the plasma generator is used to ionize the gas delivered by the air distribution device to form a heat source gas;

[0010] A calcining furnace, wherein the calcining furnace is connected to the gas outlet of the heat source supply furnace and calcines the solid mixture through the heat source gas, and the calcining furnace is connected to the air distribution device through the pipeline, and a closed gas circulation route can be formed among the air distribution device, the heat source supply furnace and the calcining furnace.

[0011] According to the solid mixture calcining system of the present invention, the pipeline is connected to the air inlet valve, and gas can be provided to the heat source supply furnace at the initial stage of calcination. The air distribution device guides the gas to the heat source supply furnace, and the gas ionized and heated to a suitable temperature by the heat source supply furnace is sent to the calcining furnace to calcine the solid mixture. When the solid mixture is calcined to produce gas (currently mainly carbon dioxide), the air inlet valve can be closed, and the gas circulates inside the pipeline. The heat source supply furnace can continue to ionize and heat the gas produced by the calcination of the solid mixture, realizing the closed-loop self-circulation of the gas, reducing resource waste and saving costs. The closed-loop pipeline can effectively reduce the escape of gas, improve energy utilization efficiency, and reduce environmental pollution caused by gas escape. Since the plasma furnace can usually produce a higher temperature than the traditional furnace, this enables the system to reach the required calcination temperature in a shorter time, further improving production efficiency and energy utilization.

[0012] In addition, the solid mixture calcining system according to the present invention may also have the following additional technical features:

[0013] In some embodiments of the present invention, the pipeline includes a first pipeline and a second pipeline, and the solid mixture calcining system also includes a preheating furnace, the preheating furnace is connected to the calcining furnace through the first pipeline, the preheating furnace is connected to the air distribution device through the second pipeline, and the preheating furnace is provided with a feed port, so that the solid mixture enters the calcining furnace through the preheating furnace.

[0014] In some embodiments of the present invention, the preheating furnace is disposed above the calcining furnace along the gravity direction, and the first pipeline has a guide structure, and the guide structure guides the solid mixture before entering the calcining furnace.

[0015] In some embodiments of the present invention, the solid mixture calcining system further comprises a gas recycling device, and the gas recycling device is respectively connected to the calcining furnace and the air inlet valve through the pipeline.

[0016] In some embodiments of the present invention, the gas recycling device includes a diverter pipeline and a power generation unit, the first end of the diverter pipeline is connected to an end of the pipeline close to the calcining furnace, the second end of the diverter pipeline is connected to an end of the pipeline close to the air intake valve, and the power generation unit is arranged on the diverter pipeline.

[0017] In some embodiments of the present invention, the pipeline is provided with a reversing valve at a location connected to the first end, and the reversing valve can allow gas to pass through the diversion pipeline.

[0018] In some embodiments of the present invention, the gas recycling device further comprises an absorption unit, and the absorption unit is connected to the power generation unit.

[0019] In some embodiments of the present invention, the heat source supply furnace includes a furnace body, the plasma generating device includes a first electrode rod, a second electrode rod and a first delivery part and a second delivery part, and a delivery channel is provided inside the furnace body, and the gas passes through the delivery channel;

[0020] The first electrode rod and the second electrode rod are arranged opposite to each other in a direction perpendicular to the direction in which the gas passes, and part of the first electrode rod and part of the second electrode rod are located in the conveying channel;

[0021] The first delivery part includes a first cylinder and a first clamp, the first cylinder is connected to the furnace body, the first clamp is connected to the first cylinder, the first clamp is connected to the first electrode rod, the first cylinder can drive the first electrode rod to move in a direction perpendicular to the gas passing through, the second delivery part includes a second cylinder and a second clamp, the second cylinder is connected to the furnace body or the ground, the second clamp is connected to the second cylinder, the second clamp is connected to the second electrode rod, the second cylinder can drive the second electrode rod to move in a direction perpendicular to the gas passing through, the first delivery part and the second delivery part can adjust the distance between the first electrode rod and the second electrode rod, so that the heat source supply furnace can adjust the temperature of the heated gas.

[0022] In some embodiments of the present invention, the heat source supply furnace further includes a constraint mechanism, and the constraint mechanism includes:

[0023] Air supply components, the number of which is two and which are respectively arranged at the two ends of the conveying channel, the two air supply components each having an air supply member arranged around the conveying channel as the center, and the air supply members of the two air supply components are arranged in opposite directions;

[0024] An air supply component is arranged outside the furnace body and is used to supply air to the air supply component.

[0025] In some embodiments of the present invention, a sealing device is provided at the connection point between the heat source supply furnace and the calcining furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 The structure diagram of the solid mixture calcining system according to an embodiment of the present invention is schematically shown;

[0028] Figure 2 The schematic structural diagram of the heat source supply furnace according to an embodiment of the present invention is schematically shown.

[0029] The reference numerals are as follows:

[0030] 100. solid mixture calcining system; 10. pipeline; 11. first pipeline; 111. guide structure; 12. second pipeline; 20. air intake valve; 30. air distribution device;

[0031] 40. heat source supply furnace; 41. furnace body; 411. conveying channel; 412. air inlet; 413. air outlet; 42. first electrode rod; 43. first delivery part; 431. first cylinder; 432. first clamping member; 44. second electrode rod; 45. second delivery part; 451. second cylinder; 452. second clamping member; 46. restraint mechanism; 461. air supply assembly; 462. air supply assembly;

[0032] 50. calcining furnace; 501. motor; 60. preheating furnace; 61. feed port; 70. gas recycling device; 701. reversing valve; 71. diversion pipeline; 711. first end; 712. second end; 72. power generation unit; 73. absorption unit. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0035] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0036] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0037] like Figure 1As shown, according to an embodiment of the present invention, a solid mixture calcining system 100 is proposed. In order to specifically illustrate the solid mixture calcining system 100, in this embodiment, the solid mixture is exemplified by cement or lime. The solid mixture calcining system 100 includes a closed-loop pipeline 10, an air intake valve 20, an air distribution device 30, a heat source supply furnace 40 and a calcining furnace 50. The air intake valve 20 is connected to the air distribution device 30 through the pipeline 10. The air intake valve 20 can allow gas to enter the pipeline 10. The air distribution device 30 is connected to the heat source supply furnace 40. The air distribution device 30 allows the gas in the pipeline 10 to circulate in the direction of flow and distributes the gas to the heat source supply furnace 40. The heat source supply furnace 40 includes a plasma generator, which is used for ionization heating. Gas, along the direction of gas flow, the heat source supply furnace 40 is connected to the calcining furnace 50, the air distribution device 30 distributes the gas heated by the heat source supply furnace 40 to the calcining furnace 50, so that the calcining furnace 50 calcines the solid mixture (such as cement particles or lime particles), the calcining furnace 50 is connected to the air distribution device 30 through a pipeline, so that the gas generated after calcination in the calcining furnace 50 can be returned to the air distribution device 30 and continued to be sent to the heat source supply furnace 40, and a closed gas circulation route can be formed among the calcining furnace 50, the air distribution device 30 and the heat source supply furnace 40.

[0038] According to the solid mixture calcining system 100 of the present invention, an air intake valve is provided on the pipeline 10, which can provide gas to the heat source supply furnace 40 at the initial stage of calcination, and the air distribution device 30 guides the gas to the heat source supply furnace 40, and the gas ionized and heated to a suitable temperature by the heat source supply furnace 40 is sent to the calcining furnace 50 to calcine the solid mixture. After the solid mixture is calcined to generate gas, the air intake valve can be closed, and the gas circulates inside the pipeline 10. The heat source supply furnace 40 can continue to ionize and heat the gas generated by the calcination of the solid mixture, realizing the closed-loop self-circulation of the gas, reducing resource waste and saving costs. The closed-loop pipeline 10 can effectively reduce the escape of gas, improve energy utilization efficiency, and may reduce environmental pollution caused by gas escape. Since the plasma furnace can usually generate a higher temperature than the traditional furnace, this enables the system to reach the required calcination temperature in a shorter time, further improving production efficiency and energy utilization.

[0039] It should be noted that the attached Figure 1 The arrow a in the middle indicates the direction of gas circulation flow, and the arrow b indicates the direction of gravity.

[0040] In some embodiments, for example, when calcining cement or lime, it is necessary to preheat the cement and lime before entering the calcining furnace 50, so the solid mixture calcining system 100 may further include a preheating furnace 60, and the pipeline 10 includes a first pipeline 11 and a second pipeline 12. The preheating furnace 60 is connected to the calcining furnace 50 through the first pipeline 11, and the preheating furnace is connected to the air distribution device 30 through the second pipeline 12. That is, along the direction of gas flow, the preheating furnace 60 is arranged downstream of the calcining furnace 50, and the preheating furnace 60 is provided with a feed port 61, which allows cement particles or lime particles to enter the preheating furnace 60 and then be sent to the calcining furnace 50. In the prior art, since the pipeline is not a closed loop, the hot gas or flue gas does not directly enter the preheating furnace 60, but is sent to a heat exchanger or a waste heat boiler through a pipeline, and then the preheating furnace 60 is heated and preheated by the heat exchanger or the waste heat boiler. In this embodiment, since the pipeline 10 is a closed loop and gas escape does not occur, the flue gas or hot gas can directly go to the preheating furnace 60 to heat the cement particles or lime particles. The flue gas after heat exchange further reduces the temperature and then goes to the first pipeline 11 to continue to participate in the next step of the process.

[0041] It is understandable that the feed port 61 of the preheating furnace 60 may be connected to a sealed feed device, which may include a rotary gate and a feed chamber. For example, the sealed feed device includes a first rotary gate, a feed chamber and a second rotary gate in sequence along the feeding direction. When feeding, the first rotary gate is first rotated open to allow lime particles or cement particles to enter the feed chamber, and then the first rotary gate is closed, the second rotary gate is opened, and the lime particles or cement particles enter the preheating furnace 60. Finally, the second rotary gate is closed to complete a feeding process. The provision of a sealed feed device can ensure that the pipeline 10 is relatively closed to prevent gas from escaping.

[0042] It is understandable that the interior of the preheating furnace 60 may be provided with sensors to monitor pressure and temperature and automatically adjust the operation of valves, fans and heat exchangers to maintain optimal working conditions and prevent smoke leakage.

[0043] It is understandable that the preheating furnace 60 is provided with an internal material conveying mechanism which may include a screw conveyor, a conveyor belt or other types of materials. The circumference of the screw conveyor and the conveyor belt fits the inner wall of the preheater, further preventing the gas from escaping through the feed port 61, while extending the time of the solid mixture in the preheating furnace 60 and enhancing the preheating effect.

[0044] Furthermore, along the gravity direction, the preheating furnace 60 is located above the calcining furnace 50, and the first pipeline 11 has a guide structure 111, which can guide the solid mixture and allow the solid mixture to enter the calcining furnace 50. Figure 1As shown in the figure, the solid mixture can slide from the preheating furnace 60 to the calcining furnace 50 under the action of gravity. In order to prevent the solid mixture from being stuck in the first pipeline 11, the first pipeline 11 is provided with a sloped guide structure 111, so that the solid mixture can slide along the slope to the calcining furnace 50. Placing the preheating furnace 60 above the calcining furnace 50 can use gravity to accelerate the downward movement of the solid mixture, reducing the input of mechanical energy or additional energy required during the material transportation process. Relying on gravity rather than a complex mechanical conveying system can reduce the maintenance requirements of the equipment and possible mechanical failures, and improve the reliability of the system. By directly transferring the preheated solid mixture from the preheating furnace 60 to the calcining furnace 50, the heat loss of the material during the transmission process is reduced, a higher temperature is maintained, and the calcining efficiency is improved. The guide structure 111 can ensure that the material enters the calcining furnace 50 accurately from the preheating furnace 60, avoiding the scattering or accumulation of the material, thereby ensuring the uniformity and efficiency of the calcining process.

[0045] It is understandable that a material distributor may be provided at the end of the guide structure 111 to achieve uniform distribution of the solid mixture when entering the calcining furnace 50 , which is crucial to the uniformity of the calcining process.

[0046] Then, in other embodiments, the calcining furnace 50 may be located at the same horizontal plane as the preheating furnace 60 , and then a feeding structure must be provided in the preheating furnace 60 or the first pipeline 11 to feed the solid mixture from the preheating furnace 60 to the calcining furnace 50 .

[0047] In some embodiments, the gas coming out of the calcining furnace 50 has a certain high temperature or contains recyclable substances, so a gas recycling device 70 may be provided between the calcining furnace 50 and the air distribution device 30 .

[0048] Specifically, in combination with the above-mentioned embodiment with the preheating furnace 60, since the gas coming out of the preheating furnace 60 still has a certain temperature (in cement and lime calcination, the temperature is between 300°C and 500°C) or other substances can be utilized, a gas recycling device 70 is provided downstream of the preheating furnace 60 along the direction of gas flow, and the gas recycling device 70 is connected to the second pipeline 12. The advantage of providing the gas recycling device 70 is that the residual heat energy in the high-temperature flue gas coming out of the preheating furnace 60 can be fully utilized, further improving the energy efficiency of the entire system and the recyclable substances.

[0049] It is understood that the substances that can be recycled and reused can be carbon dioxide, hydrogen sulfide and other sulfides, nitrogen oxides, volatile organic compounds, water vapor and phosphorus gas. For example, in the process of limestone or cement calcination, carbon dioxide is the main by-product. In the existing technology, carbon dioxide can be recovered by carbon capture and storage (CCS) technology for industrial use or geological storage; if the raw materials contain sulfur, the calcination process may produce hydrogen sulfide or other sulfides. These gases can be recovered by chemical washing or biofiltration technology and converted into useful chemicals such as sulfur or sulfuric acid; nitrogen oxides may be produced during high-temperature calcination, which can be treated by selective catalytic reduction (SCR) or non-selective catalytic reduction (SNCR) technology and converted into nitrogen and water. When calcining a solid mixture containing organic matter, organic compounds (VOCs) may be released. These gases are usually recovered using methods such as activated carbon adsorption, condensation or thermal oxidation. The possible by-products can be used as fuel or chemical raw materials; the water vapor produced during the calcination process can be recovered through a heat exchanger and converted into heat energy or electrical energy; phosphorus gas may be released during the calcination of phosphate ore, etc., which can be recovered through a special chemical washing process and made into phosphate fertilizer or other phosphorus compounds.

[0050] Specifically, the gas recycling device 70 includes a shunt pipeline 71 and a power generation unit 72. Along the direction of gas flow, the first end 711 of the shunt pipeline 71 is connected to one end of the second pipeline 12 close to the preheating furnace 60, and the second end 712 of the shunt pipeline 71 is connected to one end of the second pipeline 12 close to the air intake valve 20, that is, along the direction of gas flow, it is located downstream relative to the first end 711. The power generation unit 72 is arranged on the shunt pipeline 71. A part of the gas coming out of the preheating furnace 60 can pass through the second pipeline 12, and the other part can enter the power generation unit 72 through the shunt pipeline 71. It is mentioned above that the gas coming out of the preheating furnace 60 will also have a certain temperature, so the power generation unit 72 is provided in this embodiment to convert the heat energy into electrical energy. The power generation unit 72 can be electrically connected to the plasma generator of the heat source supply furnace 40 to directly supply power to the plasma generator, thereby reducing the dependence on the external power grid.

[0051] Furthermore, the second pipeline 12 is provided with a reversing valve 701 at the connection with the first end 711, and the reversing valve 701 can allow the gas to pass through the shunt pipeline 71. In the initial stage of calcination, there is not much available gas in the pipeline 10, so the reversing valve 701 is in the first valve position, so that the gas does not pass through the shunt pipeline 71, and only circulates in the pipeline 10. After the initial stage of calcination, the available gas is continuously supplied through calcination, and the reversing valve 701 can be adjusted to the second valve position at this time, and the gas flows from the second pipeline 12 to the shunt pipeline 71, and then returns to the second pipeline 12. The waste heat of the gas at this time is used to generate electricity.

[0052] Furthermore, a large amount of carbon dioxide is generated when lime or cement is calcined, so gas recovery can be performed while waste heat power generation is performed. For example, the gas recycling device 70 further includes an absorption unit 73, which is connected to the power generation unit 72, and the carbon dioxide passing through the power generation unit 72 is captured and collected by the absorption unit 73.

[0053] like Figure 2 As shown, in some embodiments, the heat source supply furnace 40 includes a furnace body 41, a first electrode rod 42, a second electrode rod 44, a first delivery part 43 and a second delivery part 45. A delivery channel 411 is provided inside the furnace body 41. Gas passes through the delivery channel 411. The first electrode rod 42 and the second electrode rod 44 are arranged opposite to each other in a direction perpendicular to the direction in which the gas passes. Part of the first electrode rod 42 and part of the second electrode rod 44 are located in the delivery channel 411. The first delivery part 43 includes a first cylinder 431 and a first clamp 432. The first cylinder 431 is connected to the furnace body 41. The first clamp 432 is connected to the first cylinder 431. The first clamp 432 The first electrode rod 42 is connected, and the first cylinder 431 can drive the first electrode rod 42 to move in a direction perpendicular to the direction of gas passing. The second delivery part 45 includes a second cylinder 451 and a second clamp 452. The second cylinder 451 is connected to the furnace body 41 or the ground, and the second clamp 452 is connected to the second cylinder 451. The second clamp 452 is connected to the second electrode rod 44. The second cylinder 451 can drive the second electrode rod 44 to move in a direction perpendicular to the direction of gas passing. The first delivery part 43 and the second delivery part 45 can control the distance between the first electrode rod 42 and the second electrode rod 44, so that the heat source supply furnace 40 can adjust the temperature of the heated gas.

[0054] It can be understood that the heat source supply furnace 40 of the present invention can transform the gas between the first electrode rod 42 and the second electrode rod 44 into a plasma state by arranging the first electrode rod 42 and the second electrode rod 44 on the furnace body 41 and inputting direct current into the first electrode rod 42 and the second electrode rod 44. At this time, the gas in the plasma state has high speed and high temperature, achieving the purpose of generating high-temperature gas by electric energy heating, and the gas can be used to replace the high-temperature flue gas generated by the combustion of fossil fuels to provide a heat source for the calcining furnace 50, so that the heat source supply furnace 40 not only has a good heat conversion efficiency and ensures the heating effect of the gas output, but also helps to achieve zero emission of carbon dioxide in the entire heating process and reduce pollution to the environment. At the same time, since the first electrode rod 42 and the second electrode rod 44 can be close to or away from each other inside the furnace body 41, the temperature of the gas can be adjusted, which helps to improve the applicability of the heat source supply furnace 40 and enable it to be applied to a variety of heating fields.

[0055] Specifically, the heat source supply furnace 40 also includes a detection component, which includes a first detection component and a second detection component, wherein the first detection component is used to detect the temperature of the conveying channel 411. The second detection component is used to detect the temperature and / or wind speed of the gas discharged from the heat source supply furnace 40. In this embodiment, the first detection component is a thermometer, the first detection component is arranged in the furnace body 41, and the second detection component is arranged as a temperature sensor and a wind speed sensor, and is located near the gas outlet of the heat source supply furnace 40. By arranging the first detection component and the second detection component, the temperature of the conveying channel 411 and the temperature at the gas outlet can be effectively monitored to cooperate with the plasma generating device and the air distribution device 30 to regulate the output temperature of the gas.

[0056] Specifically, the heat source supply furnace 40 also includes a constraint mechanism 46 to effectively constrain the gas so that the airflow and heat in the conveying channel 411 do not escape, thereby improving the utilization efficiency of the heat source supply furnace 40. This embodiment helps to improve the production efficiency of the gas by setting the constraint mechanism 46, and ensures the thermal conversion efficiency of the heat source supply furnace 40, so that it reaches more than 70% compared with the prior art, thereby speeding up the heating speed, shortening the production process, and improving production efficiency. Moreover, the setting of the constraint mechanism 46 can cooperate with refractory materials to prevent the inner wall of the furnace body 41 from being eroded by high-temperature gas, which helps to ensure that the inner wall of the furnace body 41 is not burned, and improves the service life and safety of the equipment. In addition, the working gas output by the constraint mechanism 46 can play a role in heat conduction and neutralization of gas, thereby improving the precise control of the heat source supply furnace 40.

[0057] Specifically, the restraint mechanism 46 includes an air supply assembly 461 and an air supply assembly 462. There are two air supply assemblies 462, which are respectively arranged at both ends of the conveying channel 411. The two air supply assemblies 462 are arranged with air supply parts around the axis of the conveying channel 411 as the center, and the air supply parts of the two air supply assemblies 462 are arranged in opposite directions. The output end of the air supply assembly 462 is parallel to the flow direction of the gas, that is, the output end of the air supply part is arranged horizontally, and the output end of the air supply part is close to the inner wall of the furnace body 41, so that the gas passing through the center of the furnace body 41 can be restrained. The air supply assembly 461 is connected to the air supply part, and the air supply assembly 461 provides high-pressure working gas to the air supply part.

[0058] It is understood that the calcining furnace 50 is a rotary kiln, which is coupled to the motor 501, and the motor 501 drives the rotary kiln to rotate. The rotary kiln driven by the motor 501 can ensure that the solid mixture is evenly turned during the calcining process, thereby achieving a more uniform heat distribution and calcining effect. This is crucial for improving product quality and consistency. The motor 501 drive can accurately control the rotation speed of the rotary kiln, making the calcining process more controllable, which is conducive to optimizing calcining conditions and improving energy efficiency.

[0059] It is understandable that a sealing device is provided at the connection point between the heat source supply furnace 40 and the calcining furnace 50. The sealing device can be an expansion joint or a bellows, and is made of high temperature resistant and corrosion resistant sealing materials, such as wear-resistant rubber, graphite or special metal.

[0060] It is understandable that the air distribution device 30 includes a fan, an air inlet and an air outlet, wherein the air inlet is arranged at the input end of the fan, and the air inlet can be used to communicate with the pipeline 10, and the air outlet is arranged at the output end of the fan, and the air outlet is communicated with the air inlet 412 of the furnace body 41, and the air outlet 413 of the furnace body 41 is connected to the pipeline 10. The air distribution device 30 can input gas to the air inlet 412 and circulate the gas in the pipeline 10. In this embodiment, the working gas is air, and the gas (such as carbon dioxide) that is output from the air outlet 413 and circulated after multiple uses. Preferably, the output power of the fan is adjustable, and the input wind speed of the working gas can be adjusted according to the feedback of the wind speed sensor in the second detection member.

[0061] It is understood that the solid particle calcining system in this embodiment further includes a control device, which is electrically connected to the first detection member, the second detection member, the plasma generating device, the air distribution device 30, the reversing valve 701 and other devices. The control device can accurately adjust the key parameters such as temperature, pressure, flow rate, etc. in the calcining system to ensure the uniformity and efficiency of the calcining process. By real-time monitoring of the operating status of the solid mixture calcining system 100, the control device can provide immediate feedback and adjustments to adapt to changing process conditions.

[0062] It is understandable that the air inlet valve 20 can be an electric or pneumatic valve, which provides air to the pipeline 10 at the initial stage of calcination, and closes the valve when the gas generated after calcination is sufficient to meet the ionization heating, so that the gas in the pipeline 10 cannot escape.

[0063] In order to describe the present embodiment in more detail, the present embodiment takes calcining limestone as an example to describe the specific working steps. In this embodiment, a solid mixture calcining system 100 for calcining limestone is proposed, the core of which includes a heat source supply furnace 40, a preheating furnace 60, a rotary kiln, a pipeline 10, an air distribution device 30, a gas recycling device 70 and an advanced control device. First, the limestone enters the preheating furnace 60 located above the calcining furnace 50 after being crushed, where it is preheated by the hot gas discharged from the calcining furnace 50. The working temperature of the preheating furnace 60 is controlled within the range of about 850°C to 900°C to ensure that the limestone is fully preheated without chemical changes. Then, the preheated limestone is fed into the rotary kiln coupled to the motor 501 by gravity for calcination. The temperature of the calcining furnace 50 is maintained at 1000°C to 1100°C to ensure that the limestone is effectively converted into lime and carbon dioxide. The speed of the rotary kiln can be adjusted as needed, usually maintained at 1 to 3 revolutions per minute.

[0064] The heat source supply furnace 40 includes a plasma generator for generating high-temperature plasma. This plasma can provide a high-efficiency and high-temperature heat source for the calcination process, effectively improving the efficiency of calcining limestone. The pipeline 10 is designed as a closed-loop system to ensure the maximization of thermal efficiency and the full utilization of thermal energy. This closed-loop design helps to avoid heat energy loss and improve the thermal efficiency of the overall system. The closed-loop pipeline ensures that the gas discharged from the preheating furnace 60 can be re-entered into the heat source supply furnace 40 and ionized and heated by the plasma generator.

[0065] The hot gas generated by calcination is then sent to the power generation unit 72 through the shunt pipe 71 for waste heat power generation, thereby improving the energy utilization efficiency of the entire system. The power generation unit 72 is connected to the absorption unit 73, and the absorption unit 73 captures carbon dioxide in the gas passing through the power generation unit 72 during the power generation process. In addition, the air distribution device 30 is connected to the heat source supply furnace 40, which optimizes the mixing ratio of air and fuel, improves combustion efficiency and reduces fuel consumption.

[0066] The operating status of the entire solid mixture calcining system 100, including temperature, pressure, flow rate and rotation speed, is monitored and adjusted in real time by advanced control devices to ensure efficient and stable operation of the system. In addition, the solid mixture calcining system 100 is also equipped with safety protection measures, including overheating protection, emergency stop button and alarm system, and flue gas treatment device for reducing environmental pollution. Through this design and control strategy, the system for calcining limestone not only improves calcination efficiency and product quality, but also realizes maximum energy utilization and minimizes environmental impact.

[0067] The solid mixture calcining system 100 of this embodiment uses a plasma generator as a heat source, replacing traditional fossil fuels, reducing the demand for fossil fuels, and thus reducing carbon emissions at the source. At the same time, the gas circulation route further reduces energy consumption and carbon emissions.

[0068] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A solid mixture calcining system, characterized in that: include: Closable intake valve; An air distribution device, the air distribution device is connected to the air intake valve through a pipeline; A heat source supply furnace, wherein the heat source supply furnace comprises a plasma generator, and an air inlet of the heat source supply furnace is connected to the air distribution device, and the plasma generator is used to ionize the gas delivered by the air distribution device to form a heat source gas; A calcining furnace, the calcining furnace is connected to the gas outlet of the heat source supply furnace and the solid mixture is calcined by the heat source gas, and the calcining furnace is connected to the air distribution device through the pipeline, and a closed gas circulation route can be formed among the air distribution device, the heat source supply furnace and the calcining furnace; Wherein, the pipeline includes a first pipeline and a second pipeline, and the solid mixture calcining system also includes a preheating furnace, the preheating furnace is connected to the calcining furnace through the first pipeline, the preheating furnace is connected to the air distribution device through the second pipeline, and the preheating furnace is provided with a feed port, so that the solid mixture enters the calcining furnace through the preheating furnace; The heat source supply furnace further comprises a furnace body and a restraining mechanism, the plasma generating device comprises a first electrode rod, a second electrode rod, a first delivery part and a second delivery part, a delivery channel is provided inside the furnace body, and the gas passes through the delivery channel; The first electrode rod and the second electrode rod are arranged opposite to each other in a direction perpendicular to the direction in which the gas passes, and part of the first electrode rod and part of the second electrode rod are located in the conveying channel; The first delivery part includes a first cylinder and a first clamping member, the first cylinder is connected to the furnace body, the first clamping member is connected to the first cylinder, the first clamping member is connected to the first electrode rod, the first cylinder can drive the first electrode rod to move in a direction perpendicular to the direction of gas passing, the second delivery part includes a second cylinder and a second clamping member, the second cylinder is connected to the furnace body or the ground, the second clamping member is connected to the second cylinder, the second clamping member is connected to the second electrode rod, the second cylinder can drive the second electrode rod to move in a direction perpendicular to the direction of gas passing, the first delivery part and the second delivery part can adjust the distance between the first electrode rod and the second electrode rod, so that the heat source supply furnace can adjust the temperature of the heated gas; The restraint mechanism includes an air supply assembly and an air supply assembly. There are two air supply assemblies, which are respectively arranged at both ends of the conveying channel. The two air supply assemblies have air supply parts arranged around the conveying channel as the center, and the air supply parts of the two air supply assemblies are arranged in opposite directions; the air supply assembly is arranged outside the furnace body and is used to supply air to the air supply assemblies.

2. The solid mixture calcining system according to claim 1, characterized in that: Along the gravity direction, the preheating furnace is arranged above the calcining furnace, and the first pipeline has a guiding structure, and the guiding structure guides the solid mixture before entering the calcining furnace.

3. The solid mixture calcining system according to claim 1, characterized in that: The solid mixture calcining system further comprises a gas recycling device, and the gas recycling device is respectively connected to the calcining furnace and the air inlet valve through the pipeline.

4. The solid mixture calcining system according to claim 3, characterized in that: The gas recycling device includes a shunt pipeline and a power generation unit. The first end of the shunt pipeline is connected to an end of the pipeline close to the calcining furnace, the second end of the shunt pipeline is connected to an end of the pipeline close to the intake valve, and the power generation unit is arranged on the shunt pipeline.

5. The solid mixture calcining system according to claim 4, characterized in that: The pipeline is provided with a reversing valve at a position connected with the first end, and the reversing valve can allow gas to pass through the diversion pipeline.

6. The solid mixture calcining system according to claim 4, characterized in that: The gas recycling device further includes an absorption unit, and the absorption unit is connected to the power generation unit.

7. The solid mixture calcining system according to claim 1, characterized in that: A sealing device is provided at the connection point between the heat source supply furnace and the calcining furnace.

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