CN117739679A - Solid mixture calcination system - Google Patents

Abstract

The invention relates to the technical field of calcining manufacturing materials, in particular to a solid mixture calcining system. The solid mixture calcining system comprises a pipeline, an air inlet valve, an air distribution device, a heat source supply furnace and a calcining furnace, wherein the air inlet valve is communicated with the air distribution device through the pipeline, the air distribution device is communicated with the heat source supply furnace, the heat source supply furnace comprises a plasma generating device, the plasma generating device is used for ionizing heating gas, the heat source supply furnace is communicated with 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 air distribution device is communicated with the calcining furnace through the pipeline, and the gas generated after the calcining furnace is continuously conveyed to the heat source supply furnace through the air distribution device. According to the solid mixture calcining system, the gas circulates in the pipeline, the heat source supplies the furnace to ionize and heat the gas, closed-loop self-circulation utilization of the gas can be realized, the resource waste is reduced, and the cost is saved.

Description

Solid mixture calcination system

Technical Field

The invention relates to the technical field of calcining manufacturing materials, in particular to a solid mixture calcining system.

Background

In industrial processes, particularly those involving thermal and chemical reactions, such as cement, lime calcination, etc., a significant amount of the gases generated by the thermal and chemical reactions are typically discharged to the environment after use. These gases, such as carbon dioxide, nitrogen oxides, sulfides, etc., represent not only waste of heat energy, but also pollution to the environment.

In the prior art, various heat recovery systems are developed for collecting and reusing the heat energy, such as heat exchangers, waste heat boilers and the like, but the systems have the problems of low efficiency, high cost, incapability of fully utilizing chemical energy in gas and the like. In particular in the prior art, the recycling of the gas is not normally blocked, which means that a part of the gas still escapes during the recycling process, resulting in further waste of resources. Meanwhile, existing gas separation technologies, such as adsorption, washing, cryogenic separation, etc., can separate out useful gas components to some extent, but are generally accompanied by high energy consumption and high operating costs. The application of these techniques is limited by their economical and environmental protection properties, and in particular, these methods have not completely met the needs of industrial production today, where environmental protection requirements are becoming increasingly stringent.

Therefore, how to efficiently, economically and environmentally realize the recycling of the gas in the industrial process, in particular how to realize the closed self-recycling of the gas, so as to minimize the resource waste and reduce the operation cost, and become an urgent need for the technical development of the field.

Disclosure of Invention

The invention aims to at least solve the problem of how to improve the efficiency of gas recycling. The aim is achieved by the following technical scheme:

the invention proposes a solid mixture calcination system comprising:

a closable intake valve;

the air distribution device is communicated with the air inlet valve through a pipeline;

a heat source supply furnace comprising a plasma generating device, wherein an air inlet of the heat source supply furnace is communicated with the air distribution device, and the plasma generating device is used for ionizing the gas conveyed by the air distribution device to form heat source gas;

the calciner is communicated with the air outlet of the heat source supply furnace and calcines the solid mixture through the heat source gas, the calciner is communicated with 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 calciner.

According to the solid mixture calcining system, the pipeline is communicated with the air inlet valve, so that gas can be supplied to the heat source supply furnace at the initial stage of calcining, the air distribution device guides the gas to the heat source supply furnace, and the gas ionized and heated to a proper 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 generate gas (mainly carbon dioxide at present), the air inlet valve can be closed, the gas circulates in the pipeline, the heat source supply furnace can continuously ionize and heat the gas generated by calcining the solid mixture, the closed-loop self-circulation utilization of the gas is realized, the resource waste is reduced, the cost is saved, the escape of the gas can be effectively reduced through the closed-loop pipeline, the energy utilization efficiency is improved, and the environmental pollution caused by the escape of the gas can be reduced. Since plasma furnaces are typically capable of producing higher temperatures than conventional furnaces, this allows the system to reach the desired calcination temperature in a shorter time, further improving production efficiency and energy utilization.

In addition, the solid mixture calcination system according to the present invention may have the following additional technical features:

in some embodiments of the invention, the pipeline comprises a first pipeline and a second pipeline, the solid mixture calcining system further comprises a preheating furnace, the preheating furnace is communicated with the calcining furnace through the first pipeline, the preheating furnace is communicated with the air distribution device through the second pipeline, and the preheating furnace is provided with a feed inlet, so that the solid mixture enters the calcining furnace through the preheating furnace.

In some embodiments of the invention, the preheater is disposed above the calciner in the direction of gravity and the first conduit has a guide structure that guides the solid mixture prior to entering the calciner.

In some embodiments of the invention, the solid mixture calcination system further comprises a gas reuse device in communication with the calciner and the inlet valve, respectively, through the pipeline.

In some embodiments of the invention, the gas recycling device comprises a diversion pipeline and a power generation unit, wherein a first end of the diversion pipeline is communicated with one end of the pipeline close to the calciner, a second end of the diversion pipeline is communicated with one end of the pipeline close to the air inlet valve, and the power generation unit is arranged on the diversion pipeline.

In some embodiments of the invention, the conduit is provided with a diverter valve in communication with the first end, the diverter valve being capable of allowing gas to pass through the diverter conduit.

In some embodiments of the invention, the gas reuse apparatus further comprises an absorption unit, which communicates with the power generation unit.

In some embodiments of the invention, the heat source supply furnace comprises a furnace body, the plasma generating device comprises a first electrode rod, a second electrode rod, a first delivery part and a second delivery part, a conveying channel is arranged in the furnace body, and the gas passes through the conveying channel;

the first electrode rod and the second electrode rod are oppositely arranged along the direction perpendicular to the passing direction of the gas, and part of the first electrode rod and part of the second electrode rod are positioned in the conveying channel;

the first delivery part comprises a first cylinder and a first clamping piece, the first cylinder is connected with the furnace body, the first clamping piece is connected with the first cylinder, the first clamping piece is connected with the first electrode rod, the first cylinder can drive the first electrode rod to move along the direction perpendicular to the passing direction of gas, the second delivery part comprises a second cylinder and a second clamping piece, the second cylinder is connected with the furnace body or the ground, the second clamping piece is connected with the second cylinder, the second clamping piece is connected with the second electrode rod, the second cylinder can drive the second electrode rod to move along the direction perpendicular to the passing direction of gas, and 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 heated gas.

In some embodiments of the invention, the heat source supply furnace further comprises a restraint mechanism comprising:

the two air supply assemblies are respectively arranged at two ends of the conveying channel, each air supply assembly is provided with an air supply piece which is arranged around the conveying channel as a center, and the directions of the air supply pieces of the two air supply assemblies are opposite;

the air supply assembly is arranged outside the furnace body and used for supplying air to the air supply assembly.

In some embodiments of the invention, a sealing device is arranged at the communication position of the heat source supply furnace and the calciner.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 schematically shows a schematic structural view of a solid mixture calcination system according to an embodiment of the present invention;

fig. 2 schematically shows a schematic structure of a heat source supply furnace according to an embodiment of the present invention.

The reference numerals are as follows:

100. a solid mixture calcination system; 10. a pipeline; 11. a first pipeline; 111. a guide structure; 12. a second pipeline; 20. an air inlet valve; 30. an air distribution device;

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

50. a calciner; 501. a motor; 60. a preheating furnace; 61. a feed inlet; 70. a gas recycling device; 701. a reversing valve; 71. a shunt pipeline; 711. a first end; 712. a second end; 72. a power generation unit; 73. an absorption unit.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations.

As shown in fig. 1, according to an embodiment of the present invention, a solid mixture calcination system 100 is proposed, in which a solid mixture is exemplified by cement or lime in order that the solid mixture calcination system 100 can be specifically described. The solid mixture calcining system 100 comprises a closed loop pipeline 10, an air inlet valve 20, an air distribution device 30, a heat source supply furnace 40 and a calcining furnace 50, wherein the air inlet valve 20 is communicated with the air distribution device 30 through the pipeline 10, the air inlet valve 20 can allow gas to enter the pipeline 10, the air distribution device 30 is communicated with the heat source supply furnace 40, the air distribution device 30 circulates the gas in the pipeline 10 along the flowing direction and distributes the gas to the heat source supply furnace 40, the heat source supply furnace 40 comprises a plasma generating device which is used for ionizing and heating the gas, the heat source supply furnace 40 is communicated with the calcining furnace 50 along the flowing direction of the gas, 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) through the pipeline communication air distribution device 30, so that the gas generated after the calcining furnace 50 is calcined can be returned to the air distribution device 30 and is continuously 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.

According to the solid mixture calcination system 100 of the present invention, the gas supply valve is provided in the pipe 10, so that the gas can be supplied to the heat source supply furnace 40 at the initial stage of calcination, and the gas is introduced into the heat source supply furnace 40 by the air distribution device 30, ionized and heated to a proper temperature by the heat source supply furnace 40, and supplied to the calciner 50, and the solid mixture is calcined. After the solid mixture is calcined to generate gas, the air inlet valve can be closed, the gas circulates in the pipeline 10, the heat source supply furnace 40 can continuously ionize and heat the gas generated by calcining the solid mixture, the closed-loop self-circulation utilization of the gas is realized, the resource waste is reduced, the cost is saved, the closed-loop pipeline 10 can effectively reduce the escape of the gas, the energy utilization efficiency is improved, and the environmental pollution caused by the escape of the gas is possibly reduced. Since plasma furnaces are typically capable of producing higher temperatures than conventional furnaces, this allows the system to reach the desired calcination temperature in a shorter time, further improving production efficiency and energy utilization.

It should be noted that, in fig. 1, arrow a indicates the direction of the gas circulation flow, and arrow b indicates the direction of gravity.

In some embodiments, such as calcining cement or lime, it may be desirable to preheat the cement and lime prior to entering the calciner 50, so the solids mixture calcination system 100 may further include a preheater 60, the conduit 10 including a first conduit 11 and a second conduit 12, the preheater 60 being in communication with the calciner 50 via the first conduit 11, the preheater being in communication with the air distribution device 30 via the second conduit 12. I.e. in the direction of the gas flow, the preheater 60 is arranged downstream of the calciner 50 and the preheater 60 is provided with a feed opening 61, which feed opening 61 allows cement particles or lime particles to enter the preheater 60 and to be fed to the calciner 50. In the prior art, since the pipeline is not closed loop, hot gas or flue gas is not directly fed into the preheating furnace 60, but is sent to a heat exchanger or a waste heat boiler and other devices through the pipeline, and then the preheating furnace 60 is heated and preheated through the heat exchanger or the waste heat boiler. In this embodiment, since the pipeline 10 is closed loop, no gas escape occurs, so the flue gas or hot gas can directly pass to the preheating furnace 60 to heat the cement particles or lime particles, and the temperature of the flue gas after heat exchange is further reduced, and then the flue gas passes to the first pipeline 11 to continue to participate in the next flow.

It will be appreciated that the feed port 61 of the preheating furnace 60 may be connected to a sealing feed device, and the sealing feed device may include a rotary gate and a feed chamber, for example, the sealing feed device includes a first rotary gate, a feed chamber and a second rotary gate sequentially along the feed direction, and during feeding, the first rotary gate is first rotated to open, let lime particles or cement particles enter the feed chamber, then the first rotary gate is closed, the second rotary gate is opened, lime particles or cement particles enter the preheating furnace 60, and finally the second rotary gate is closed, thereby completing a feeding process. The provision of a sealed feed arrangement ensures that the pipeline 10 is relatively closed, preventing gas from escaping.

It will be appreciated that the interior of the preheating furnace 60 may be provided with sensors to monitor pressure and temperature, automatically adjust the operation of the valves, fans and heat exchangers to maintain optimum operating conditions and prevent smoke leakage.

It will be appreciated that the preheating furnace 60 may include a screw conveyor, conveyor belt or other type of material conveying mechanism therein, wherein the screw conveyor and conveyor belt are circumferentially fitted to the inner wall of the preheating furnace to further prevent gas from escaping through the feed port 61, and to extend the time of the solid mixture in the preheating furnace 60 to enhance the preheating effect.

Further, the preheating furnace 60 is located above the calciner 50 in the direction of gravity, and the first pipe 11 has a guiding structure 111, which guiding structure 111 is capable of guiding the solid mixture and letting it into the calciner 50. As shown in fig. 1, the solid mixture can slide from the preheating furnace 60 toward the calciner 50 by gravity, and in order that the solid mixture does not get stuck in the first pipe 11, the first pipe 11 is provided with a slope-like guide structure 111, so that the solid mixture can slide along the slope toward the calciner 50. Placing the preheater 60 above the calciner 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 transfer process. Relying on gravity rather than a complex mechanical transport system can reduce maintenance requirements for equipment and possible mechanical failure, improving reliability of the system. By directly transferring the preheated solid mixture from the preheater 60 to the calciner 50, heat loss from the material during transport is reduced, higher temperatures are maintained, and calcination efficiency is improved. The guide structure 111 ensures that the material precisely enters the calciner 50 from the preheater 60, avoiding material scattering or stacking, and thus ensuring uniformity and efficiency of the calcination process.

It will be appreciated that a material distributor may be provided at the end of the guide 111 to achieve a uniform distribution of the solid mixture as it enters the calciner 50, which is critical to the uniformity of the calcination process.

In other embodiments, the calciner 50 may be located at the same level as the preheater 60, and the preheater 60 or the first conduit 11 may be provided with a feed arrangement for feeding the solid mixture from the preheater 60 to the calciner 50.

In some embodiments, the gas exiting the calciner 50 has a high temperature or available material, so a gas recycling device 70 may also be provided between the calciner 50 and the air distribution device 30.

Specifically, in connection with the above-described embodiment with the preheating furnace 60, since the gas exiting from the preheating furnace 60 is still available at a certain temperature (in cement and lime calcination, this temperature is between 300 ℃ and 500 ℃) or other substances, a gas reuse device 70 is provided downstream of the preheating furnace 60 in the direction of gas flow, which gas reuse device 70 communicates with the second pipe 12. The gas recycling device 70 has the advantage of fully utilizing the residual heat energy in the high-temperature flue gas from the preheating furnace 60, thereby further improving the energy efficiency of the whole system and recycling the recycled substances.

It will be appreciated that the recyclable materials may be carbon dioxide, hydrogen sulfide and other sulfides, oxynitrides, volatile organic compounds, steam and phosphorus gases, for example, carbon dioxide is a major byproduct in limestone or cement calcination processes, and in the prior art carbon dioxide may be recovered for industrial or geological sequestration by Carbon Capture and Sequestration (CCS) techniques; if the feedstock contains sulfur, the calcination process may produce hydrogen sulfide or other sulfides. These gases can be recovered by chemical scrubbing or biological filtration techniques and converted to useful chemicals such as sulfur or sulfuric acid; nitrogen oxides may be produced during high temperature calcination, and these gases may be treated by Selective Catalytic Reduction (SCR) or non-selective catalytic reduction (SNCR) techniques and converted to nitrogen and water. Organic Compounds (VOCs) may be released during calcination of the solid mixture containing the organic matter, and these gases are recovered, typically by activated carbon adsorption, condensation or thermal oxidation, and the possible byproducts may be used as fuel or chemical raw materials; the water vapor generated in the calcination process can be recovered through a heat exchanger and converted into heat energy or electric energy; phosphorus gas may be released during calcination of phosphate ores and the like, which may be recovered by special chemical washing processes and made into phosphate fertilizers or other phosphorus compounds.

Specifically, the gas recycling device 70 includes a diversion pipe 71 and a power generation unit 72, wherein a first end 711 of the diversion pipe 71 is connected to an end of the second pipe 12 near the preheating furnace 60 in the direction of gas flow, a second end 712 of the diversion pipe 71 is connected to an end of the second pipe 12 near the intake valve 20, i.e., downstream of the first end 711 in the direction of gas flow, and the power generation unit 72 is provided on the diversion pipe 71. Part of the gas exiting the preheating furnace 60 may pass through the second conduit 12 and the other part may enter the power generation unit 72 through the split conduit 71. Since the gas discharged from the preheating furnace 60 has a certain temperature, the power generation unit 72 is provided in the present embodiment, and the heat energy is converted into electric energy. The power generation unit 72 may be electrically connected to the plasma generation device of the heat source supply furnace 40 to directly supply power to the plasma generation device, reducing dependence on the external power grid.

Further, the second conduit 12 is provided with a reversing valve 701 at a communication with the first end 711, which reversing valve 701 enables gas to pass through the shunt conduit 71. At the beginning of calcination, there is little gas available in line 10, so that the reversing valve 701 is in the first position, allowing gas to circulate only in line 10 without passing through the bypass line 71. After the initial stage of calcination, the available gas is continuously supplied through calcination, and the reversing valve 701 is adjusted to the second valve position, so that the gas flows from the second line 12 to the diversion line 71, and then returns to the second line 12. And generating electricity by using the waste heat of the gas at the moment.

Further, a large amount of carbon dioxide is generated when lime or cement is calcined, so that gas recovery can be performed while power generation by waste heat is performed. For example, the gas reuse apparatus 70 further includes an absorption unit 73, the absorption unit 73 communicates with the power generation unit 72, and carbon dioxide passing through the power generation unit 72 is captured and collected by the absorption unit 73.

As shown in fig. 2, in some embodiments, the heat source supply furnace 40 includes a furnace body 41, a first electrode rod 42, a second electrode rod 44, and a first delivery part 43 and a second delivery part 45, a conveying channel 411 is provided inside the furnace body 41, gas passes through the conveying channel 411, the first electrode rod 42 and the second electrode rod 44 are oppositely disposed along a direction perpendicular to the direction of gas passing, and a part of the first electrode rod 42 and a part of the second electrode rod 44 are located in the conveying channel 411, the first delivery part 43 includes a first cylinder 431 and a first clamping member 432, the first cylinder 431 is connected with the furnace body 41, the first clamping member 432 is connected with the first cylinder 431, the first clamping member 432 is connected with the first electrode rod 42, the first cylinder 431 can drive the first electrode rod 42 to move along the direction perpendicular to the direction of gas passing, the second delivery part 45 includes a second cylinder 451 and a second clamping member 452, the second cylinder 451 is connected with the furnace body 41 or the ground, the second clamping member 452 is connected with the second electrode rod 44, the second cylinder 451 can drive the second electrode rod 44 to move along the direction perpendicular to the direction of gas passing, and the first delivery part 45 can control the distance between the first electrode rod 42 and the first electrode rod 44 can be heated.

It can be understood that, in the heat source supply furnace 40 of the present invention, the first electrode rod 42 and the second electrode rod 44 are disposed on the furnace body 41, and direct current is input to the first electrode rod 42 and the second electrode rod 44, so that gas between the first electrode rod 42 and the second electrode rod 44 is converted into a plasma state, and at this time, the gas in the plasma state has high-speed and high-temperature, thereby realizing the purpose of generating high-temperature gas by heating through electric energy, and the gas can be used for replacing high-temperature flue gas generated by burning fossil fuel, so as to provide a heat source for the calciner 50, so that the heat source supply furnace 40 not only has better heat conversion efficiency, but also ensures the heating effect of the gas output by the calciner, and is helpful for realizing zero emission of carbon dioxide in the whole heating process and reducing environmental pollution. Meanwhile, since the first electrode rod 42 and the second electrode rod 44 can be moved toward or away from each other inside the furnace body 41, the temperature of the gas can be adjusted, which contributes to improving the applicability of the heat source supply furnace 40 and enabling it to be applied to various heating fields.

Specifically, the heat source supply furnace 40 further includes a detecting assembly including a first detecting member and a second detecting member, wherein the first detecting member is configured to detect the temperature of the conveying passage 411. The second detecting member is for detecting the temperature and/or wind speed of the gas discharged from the heat source supply furnace 40. In the present embodiment, the first detecting element is a thermometer, the first detecting element is disposed in the furnace body 41, and the second detecting element is 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 detecting member and the second detecting member, the temperature of the conveying channel 411 and the temperature of the air outlet can be effectively monitored, so that the output temperature of the air can be regulated and controlled by the plasma generating device and the air distribution device 30.

Specifically, the heat source supply furnace 40 further includes a restriction mechanism 46 for effectively restricting the gas so that the gas flow and heat in the conveying passage 411 do not escape, thereby improving the utilization efficiency of the heat source supply furnace 40. The restraint mechanism 46 is provided in this embodiment, which helps to improve the production efficiency of gas, and ensures the heat conversion efficiency of the heat source supply furnace 40 to be 70% or more than in the prior art, so that the heating speed can be increased, the production flow can be shortened, and the production efficiency can be improved. Moreover, the setting of restraint mechanism 46 can cooperate refractory material, avoids the inner wall of furnace body 41 to receive the scouring of high temperature gas, helps guaranteeing that the inner wall of furnace body 41 is not burnt out, improves life and the security of equipment. In addition, the working gas output from the restraint mechanism 46 can perform the functions of heat transfer and neutralizing the gas, improving the precise control of the heat source supply furnace 40.

Specifically, the restraint mechanism 46 includes two air supply assemblies 461 and 462, the number of the air supply assemblies 462 is two, and the two air supply assemblies 462 are respectively disposed at two ends of the conveying channel 411, the two air supply assemblies 462 are all disposed around the axis of the conveying channel 411 as the center, the directions of the air supply assemblies of the two air supply assemblies 462 are relatively disposed, the directions of the output ends of the air supply assemblies 462 are parallel to the flowing direction of the air, that is, the directions of the output ends of the air supply assemblies are horizontally disposed, and the output ends of the air supply assemblies are close to the inner wall of the furnace body 41, so that the air passing through the center of the furnace body 41 can be restrained. The air supply assembly 461 communicates with the air supply member, and the air supply assembly 461 supplies high-pressure working gas to the air supply member.

It will be appreciated that the calciner 50 is a rotary kiln which is coupled to a motor 501, the motor 501 driving the rotary kiln in rotation. The rotary kiln driven by the motor 501 ensures that the solid mixture turns evenly during calcination, thereby achieving a more uniform heat distribution and calcination effect. This is important to improve product quality and consistency. The rotation speed of the rotary furnace can be precisely controlled by driving the motor 501, so that the calcination process is more controllable, and the calcination condition is favorably optimized and the energy efficiency is improved.

It will be appreciated that a sealing means is provided where the heat source supply furnace 40 and calciner 50 communicate. The sealing means may be an expansion joint or a bellows and may be made of a high temperature, corrosion resistant sealing material, such as wear resistant rubber, graphite or special metals.

It will be appreciated that the air distribution device 30 includes a fan, an air inlet portion and an air outlet portion, wherein the air inlet portion is disposed at an input end of the fan, the air inlet portion is used for communicating with the pipeline 10, the air outlet portion is disposed at an output end of the fan, the air outlet portion is communicated with the air inlet 412 of the furnace 41, and the air outlet 413 of the furnace 41 is communicated with the pipeline 10. The air distribution device 30 is capable of inputting air into the air inlet 412 and circulating the air in the pipeline 10. In this embodiment, the working gas is air, and the gas (e.g., carbon dioxide) that is outputted from the gas outlet 413 and circulated through 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 part.

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

It will be appreciated that the inlet valve 20 may be an electric or pneumatic valve which provides air to the conduit 10 during the initial stage of calcination and closes the valve after sufficient ionization heating has occurred to prevent escape of the gases within the conduit 10.

To describe this embodiment in more detail, this example describes specific working steps by taking calcined limestone as an example. In this embodiment, a solid mixture calcining system 100 for calcining limestone is provided, the core of which comprises a heat source supply furnace 40, a preheating furnace 60, a rotary kiln, a pipeline 10, a wind distribution device 30, a gas recycling device 70 and an advanced control device. First, the limestone is crushed and then introduced into a preheating furnace 60 located above the calciner 50, where it is preheated by hot gas discharged from the calciner 50, and the operating temperature of the preheating furnace 60 is controlled to be in the range of about 850 ℃ to 900 ℃ to ensure that the limestone is sufficiently preheated without chemical changes. The preheated limestone is then gravity fed into a rotary kiln coupled to motor 501 for calcination, with the temperature of calciner 50 maintained at 1000 to 1100 ℃, ensuring efficient conversion of the limestone to lime and carbon dioxide. The rotational speed of the rotary kiln can be adjusted as required, typically to remain at 1 to 3 revolutions per minute.

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

The hot gas generated by calcination is then sent to the power generation unit 72 through the split line 71 for waste heat power generation, thereby improving the energy utilization efficiency of the entire system. The power generation unit 72 communicates with the absorption unit 73, and the absorption unit 73 captures carbon dioxide in the gas passing through the power generation unit 72 during power generation. In addition, the air distribution device 30 communicates with the heat source supply furnace 40, optimizing the mixing ratio of air and fuel, improving combustion efficiency and reducing fuel consumption.

The operating conditions of the entire solid mixture calcination system 100, including temperature, pressure, flow, rotational speed, etc., are monitored and regulated in real time by advanced control devices, ensuring efficient and stable operation of the system. In addition, the solid mixture calcination system 100 is also equipped with safety precautions including overheat protection, emergency shutdown buttons and alarm systems, and fume treatment devices for reducing environmental pollution. By this design and control strategy, the system for calcining limestone not only improves the calcining efficiency and product quality, but also achieves maximum utilization of energy and minimum environmental impact.

The solid mixture calcination system 100 of the present embodiment uses a plasma generating device as a heat source, replaces conventional fossil fuel, and reduces the demand for fossil fuel, thereby reducing carbon emissions from the source. Meanwhile, the gas circulation route further reduces energy consumption and carbon emission, and has remarkable significance for achieving the aim of carbon neutralization in the industrial production process.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. A system for calcining a solid mixture, comprising:

a closable intake valve;

the air distribution device is communicated with the air inlet valve through a pipeline;

a heat source supply furnace comprising a plasma generating device, wherein an air inlet of the heat source supply furnace is communicated with the air distribution device, and the plasma generating device is used for ionizing the gas conveyed by the air distribution device to form heat source gas;

the calciner is communicated with the air outlet of the heat source supply furnace and calcines the solid mixture through the heat source gas, the calciner is communicated with 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 calciner.

2. The solid mixture calcination system according to claim 1, wherein the pipeline comprises a first pipeline and a second pipeline, the solid mixture calcination system further comprises a preheating furnace, the preheating furnace is communicated with the calciner through the first pipeline, the preheating furnace is communicated with the air distribution device through the second pipeline, and the preheating furnace is provided with a feed inlet, so that the solid mixture enters the calciner through the preheating furnace.

3. The system of claim 2, wherein the preheater is positioned above the calciner in the direction of gravity and the first conduit has a guide structure that guides the solid mixture prior to entering the calciner.

4. The system for calcining a solid mixture according to claim 1 further comprising a gas recycling device which communicates with the calciner and the inlet valve respectively via the pipeline.

5. The calcination system for solid mixture according to claim 4, wherein the gas recycling device comprises a diversion pipeline and a power generation unit, wherein a first end of the diversion pipeline is communicated with one end of the pipeline close to the calciner, a second end of the diversion pipeline is communicated with one end of the pipeline close to the air inlet valve, and the power generation unit is arranged on the diversion pipeline.

6. The solids mixture calcination system according to claim 5, wherein the conduit is provided with a diverter valve in communication with the first end, the diverter valve being capable of allowing gas to pass through the diverter conduit.

7. The solids mixture calcination system according to claim 5, wherein the gas reuse apparatus further comprises an absorption unit in communication with the power generation unit.

8. The calcination system for solid mixture according to claim 1, wherein the heat source supply furnace comprises a furnace body, the plasma generating device comprises a first electrode rod, a second electrode rod, a first delivery part and a second delivery part, a conveying channel is arranged inside the furnace body, and the gas passes through the conveying channel;

the first electrode rod and the second electrode rod are oppositely arranged along the direction perpendicular to the passing direction of the gas, and part of the first electrode rod and part of the second electrode rod are positioned in the conveying channel;

the first delivery part comprises a first cylinder and a first clamping piece, the first cylinder is connected with the furnace body, the first clamping piece is connected with the first cylinder, the first clamping piece is connected with the first electrode rod, the first cylinder can drive the first electrode rod to move along the direction perpendicular to the passing direction of gas, the second delivery part comprises a second cylinder and a second clamping piece, the second cylinder is connected with the furnace body or the ground, the second clamping piece is connected with the second cylinder, the second clamping piece is connected with the second electrode rod, the second cylinder can drive the second electrode rod to move along the direction perpendicular to the passing direction of gas, and 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 heated gas.

9. The solids mixture calcination system of claim 8, wherein the heat source supply furnace further comprises a restraint mechanism comprising:

the two air supply assemblies are respectively arranged at two ends of the conveying channel, each air supply assembly is provided with an air supply piece which is arranged around the conveying channel as a center, and the directions of the air supply pieces of the two air supply assemblies are opposite;

the air supply assembly is arranged outside the furnace body and used for supplying air to the air supply assembly.

10. The calcination system for solid mixtures according to claim 1, wherein a sealing means is provided at a place where the heat source supply furnace and the calciner communicate.