Preheating furnace and solid particle calcining system

Abstract

The utility model belongs to the technical field of calcination manufacturing materials, and particularly relates to a preheating furnace and a solid particle calcination system.The preheating furnace comprises a furnace body, a feeding assembly and a pushing assembly, the furnace body is provided with a preheating cavity, a material inlet, a gas outlet, a material gas inlet and a material gas outlet, and the material inlet, the gas outlet and the material gas inlet are communicated with the preheating cavity; the feeding assembly communicates with the material inlet and is suitable for supplying materials to the furnace body. The material pushing assembly is arranged on the furnace body and used for pushing materials in the preheating cavity into the material gas inlet and outlet. Gas enters the preheating cavity from the material gas inlet and outlet, exchanges heat with materials in the preheating cavity and then is discharged from the gas outlet. The preheating furnace disclosed by the utility model can be used for a solid particle calcining system, and can preheat solid particles to be calcined by using calcined tail gas, so that not only can the heat of the tail gas be fully utilized, but also the calcining efficiency in the calcining furnace can be improved through preheating, namely, the production efficiency and the energy utilization rate are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of calcining manufacturing materials, and in particular relates to a preheating furnace and a solid particle 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. They are limited by their economy and environmental protection, especially today when environmental protection requirements are increasingly stringent. These methods can no longer fully meet the needs of industrial production.

[0004] Therefore, the present utility model is specially proposed. Utility Model Content

[0005] The utility model aims to provide a preheating furnace and a solid particle calcining system to solve the gas problem in the solid powder calcining system in the prior art.

[0006] The first aspect of the utility model provides a preheating furnace, comprising:

[0007] A furnace body, wherein the furnace body is formed with a preheating chamber and a material inlet, a gas outlet, and a material gas inlet and outlet communicated with the preheating chamber;

[0008] A feeding assembly, the feeding assembly is communicated with the material inlet and is suitable for feeding the furnace body;

[0009] A material pushing assembly, which is arranged on the furnace body and is used to push the material in the preheating chamber into the material gas inlet and outlet;

[0010] The gas enters the preheating chamber from the material gas inlet and outlet, and is discharged from the gas outlet after exchanging heat with the material in the preheating chamber.

[0011] According to the preheating furnace of the utility model, the furnace body is provided with a preheating chamber and a material inlet, a gas outlet and a material gas inlet and outlet, so that the high-temperature gas can enter the preheating chamber through the material gas inlet and outlet and be discharged through the gas outlet, and the material in the feeding assembly can enter the preheating chamber through the material inlet and be discharged through the material gas inlet and outlet. In this process, the material exchanges heat with the high-temperature gas to achieve preheating of the material. In this way, when the preheating furnace is connected to the solid particle calcining system, it can use the calcined tail gas to preheat the solid particles to be calcined, which can not only fully utilize the heat of the tail gas, but also improve the calcination efficiency in the calcining furnace through preheating, that is, improve production efficiency and energy utilization.

[0012] The preheating furnace provided in the embodiment of the utility model may also have the following additional technical features:

[0013] In a specific embodiment of the utility model, the furnace body includes a base and a box body each having an inner cavity, the box body is multiple and is connected to the upper surface of the base along the circumference of the base to form the preheating chamber, the material gas inlet and outlet are arranged on the base, and each of the boxes is provided with a material inlet and a gas outlet.

[0014] In a specific embodiment of the utility model, a pair of side surfaces of the base are inclined and include a first inclined surface and a second inclined surface connected below the first inclined surface, and the angle between the first inclined surface and the horizontal direction is smaller than the angle between the second inclined surface and the horizontal direction.

[0015] In a specific embodiment of the utility model, the feeding assembly includes a distributor and a conveying pipe. The distributor is arranged above the furnace body and is provided with a feed port and a discharge port. The conveying pipe is connected between the discharge port and the material inlet.

[0016] In a specific embodiment of the utility model, the feeding assembly further comprises two valves which are sequentially arranged on the conveying pipe along the length direction of the conveying pipe, and one of the two valves is selectively opened to feed the material.

[0017] In a specific embodiment of the utility model, the bottom surface of the distributor is in the shape of a cone protruding upward, the orthographic projection of the feed port coincides with the tip of the cone, and the discharge ports are distributed on the periphery of the bottom surface.

[0018] In a specific embodiment of the utility model, the pushing assembly includes a push rod and a driver connected to each other, the push rod is connected to the furnace body, and the push head of the push rod extends into the preheating chamber; the push head of the push rod is extended and retracted under the drive of the driver to push the material in the preheating chamber into the material gas inlet and outlet.

[0019] In a specific implementation manner of the utility model, the driver includes a cylinder, a hydraulic cylinder or a motor.

[0020] In a specific implementation manner of the present invention, in the longitudinal direction of the preheating chamber, the gas outlet is located above the material inlet.

[0021] The second aspect of the utility model also provides a solid particle calcining system, comprising:

[0022] Closable intake valve;

[0023] An air distribution device, the air distribution device is connected to the air intake valve through a pipeline;

[0024] 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;

[0025] a calcining furnace, the calcining furnace being in communication with a gas outlet of the heat source supply furnace and calcining the solid mixture by the heat source gas;

[0026] The preheating furnace described in any of the above items, the gas material inlet and outlet of the preheating furnace are connected with the gas material inlet and outlet of the calcining furnace, the preheating furnace is used to use the gas discharged from the calcining furnace to preheat the material to be transported to the calcining furnace, and the gas outlet of the preheating furnace is connected 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, the calcining furnace and the preheating furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic cross-sectional structure diagram of a preheating furnace in one embodiment of the utility model;

[0029] Figure 2 It is a cross-sectional structural schematic diagram of another view of the preheating furnace in one embodiment of the utility model;

[0030] Figure 3 It is a half-section front view of some structures in the furnace body;

[0031] Figure 4 This is a top view of some structures in the furnace body.

[0032] Description of reference numerals:

[0033] 100-preheating furnace;

[0034] 10-furnace body, 11-base, 12-box, 13-gas outlet, 14-material inlet, 15-material gas inlet and outlet, 16-mounting hole, 17-mounting seat, 18-guide surface, 19-preheating chamber;

[0035] 20-feeding assembly, 21-distributor, 22-delivery pipe, 23-valve;

[0036] 30-push assembly, 31-push rod, 32-driver. DETAILED DESCRIPTION

[0037] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0038] It should be understood that the terms used herein 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 herein 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.

[0039] 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.

[0040] 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 elements 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.

[0041] like Figure 1-4 As shown, an embodiment of the utility model provides a preheating furnace 100 , which includes a furnace body 10 , a feeding assembly 20 and a pushing assembly 30 .

[0042] Specifically, the furnace body 10 is formed with a preheating chamber 19 and a material inlet 14, a gas outlet 13 and a material gas inlet and outlet 15 connected to the preheating chamber 19; the feeding assembly 20 is connected to the material inlet 14 and is suitable for feeding the furnace body 10; the pushing assembly 30 is arranged on the furnace body 10, and is used to push the material in the preheating chamber 19 into the material gas inlet and outlet 15; wherein, the gas enters the preheating chamber 19 from the material gas inlet and outlet 15, and is discharged from the gas outlet 13 after heat exchange with the material in the preheating chamber 19.

[0043] According to the preheating furnace 100 of the utility model, the furnace body 10 is provided with a preheating chamber 19, a material inlet 14, a gas outlet 13 and a material gas inlet and outlet 15, so that the high-temperature gas can enter the preheating chamber 19 through the material gas inlet and outlet 15 and be discharged through the gas outlet 13, and the material in the feeding assembly 20 can enter the preheating chamber 19 through the material inlet 14 and be discharged through the material gas inlet and outlet 15. In this process, the material exchanges heat with the high-temperature gas to achieve preheating of the material. In this way, when the preheating furnace 100 is connected to the solid particle calcining system, it can use the calcined tail gas to preheat the solid particles to be calcined, which can not only fully utilize the heat of the tail gas, but also improve the calcination efficiency in the calcining furnace through preheating, that is, improve production efficiency and energy utilization.

[0044] It can be understood that the furnace body 10 can be a vertical furnace body 10 or a horizontal furnace body 10. Preferably, the furnace body 10 is a vertical furnace body 10 and is arranged above the calcining furnace. The material entering the preheating chamber 19 through the material inlet 14 falls to the bottom of the preheating chamber 19 under the action of gravity, and falls into the material gas inlet and outlet 15 under the action of gravity or the pushing component 30, and finally slides toward the calcining furnace under the action of gravity.

[0045] It can be understood that the pushing assembly 30 is used to push the material scattered around the material gas inlet and outlet 15 into the material gas inlet and outlet 15 to avoid the material from scattering or accumulating in the preheating chamber 19, thereby avoiding the material from clogging the preheating chamber 19, thereby ensuring the uniformity and efficiency of the subsequent calcination process.

[0046] In one embodiment of the utility model, the furnace body 10 includes a base 11 and a box body 12, each of which has an inner cavity. There are multiple boxes 12, which are connected to the upper surface of the base 11 along the circumference of the base 11 to form a preheating chamber 19. The material gas inlet and outlet 15 are arranged on the base 11, and each box body 12 is provided with a material inlet 14 and a gas outlet 13. In this way, the material can be dispersed to each material inlet 14 to enter the preheating chamber 19 to exchange heat with the high-temperature gas. The dispersion of the material can effectively increase the contact with the high-temperature gas, thereby improving the heat exchange efficiency between the material and the high-temperature gas, and improving the heat recovery rate of the exhaust gas.

[0047] It can be understood that the base 11 and the box body 12 both include an outer shell formed by welding steel plates and a refractory layer arranged inside the outer shell. Specifically, the outer shells of the base 11 and the box body 12 are first connected, and the refractory layer is poured inside the connected outer shell using the outer shell as a mold.

[0048] In one embodiment of the utility model, a guide surface 18 is provided on the base 11, and the material slides along the guide surface 18 toward the material gas inlet and outlet 15. Since the box body 12 is arranged at the periphery of the base 11, and the material gas inlet and outlet 15 is arranged at the center of the base 11, the material falling into the base 11 through the material inlet 14 on the box body 12 will be relatively scattered at the periphery of the material gas inlet and outlet 15. In this embodiment, by providing the guide surface 18 on the base 11, it is beneficial for the material to slide along the guide surface 18 toward the material gas inlet and outlet 15.

[0049] Optionally, the guide surface 18 is a pair of inclined surfaces arranged inside the base 11, each of which includes a first inclined surface and a second inclined surface connected below the first inclined surface, and the angle between the first inclined surface and the horizontal direction is smaller than the angle between the second inclined surface and the horizontal direction. In this way, the material can stay on the first inclined surface to extend its preheating time, thereby further increasing its preheated temperature, which is beneficial to subsequent calcination.

[0050] In one embodiment of the present invention, the feeding assembly 20 includes a distributor 21 and a conveying pipe 22. The distributor 21 is disposed above the furnace body 10 and is provided with a feed port and a discharge port. The conveying pipe 22 is connected between the discharge port and the material inlet.

[0051] Specifically, the number of the discharge ports and the conveying pipes 22 is the same as the number of the boxes 12 , so that the material inlet 14 of each box 12 is connected to the distributor 21 through a conveying pipe 22 .

[0052] In one embodiment of the present invention, the feeding assembly 20 further includes two valves 23 sequentially arranged on the feeding pipe 22 along the length direction of the feeding pipe 22 , and one of the two valves 23 is opened to feed the material.

[0053] Specifically, when the two valves 23 are closed, the conveying pipe 22 at this position is in a sealed state. When unloading, the lower valve 23 is closed and the upper valve 23 is opened, so that the material in the distributor 21 enters the conveying pipe 22 between the two valves 23, and then the upper valve 23 is closed and the lower valve 23 is opened, so that the material between the conveying pipes 22 of the two valves 23 enters the preheating chamber 19 through the material inlet 14, and a feeding process is completed. The cycle is repeated to achieve feeding.

[0054] The utility model can prevent the gas in the preheating chamber 19 from entering the delivery pipe 22 through the material inlet 14 by setting the above two valves 23, thereby preventing the leakage of high-temperature gas. At the same time, the feeding speed and feeding flow rate of the material can be further controlled.

[0055] In one embodiment of the utility model, the bottom surface of the distributor 21 is in the shape of a cone protruding upward, the orthographic projection of the feed port coincides with the tip of the cone, and the discharge port is distributed on the periphery of the bottom surface.

[0056] By setting the bottom surface of the distributor 21 to be conical, it has a guiding effect, thereby guiding the material from the feed port to the discharge port, thereby avoiding the accumulation of material in the distributor 21, and thus better controlling the feed speed and feed flow rate of the material. At the same time, the tip of the cone also has a certain material dispersion effect, thereby making the material more uniform.

[0057] In one embodiment of the utility model, the pushing assembly 30 includes a push rod 31 and a driver 32 connected to each other. The push rod 31 is connected to the furnace body 10, and the push head of the push rod 31 extends into the preheating chamber 19; the push head of the push rod 31 is extended and retracted under the drive of the driver 32 to push the material in the preheating chamber 19 into the material gas inlet and outlet 15.

[0058] Specifically, a mounting seat 17 is provided on each of the two opposite sides of the base 11, and a mounting hole 16 corresponding to the mounting seat 17 is provided on the side wall of the base 11. The mounting hole 16 is located above the first inclined surface and parallel to the extension direction of the first inclined surface. The push rod 31 is installed on the mounting seat 17, and the push head is inserted into the preheating chamber 19 from the mounting hole 16. When the material needs to be pushed, the driver 32 is started, thereby driving the push rod 31 to move in and out of the mounting hole 16. When the push rod 31 moves toward the preheating chamber 19, it can push the material accumulated on the first inclined surface to slide to the material gas inlet and outlet 15.

[0059] That is, by providing the push rod 31 and the driver 32, the present embodiment can control the material flow rate, thereby preventing the material from being excessively accumulated in the preheating chamber 19 and affecting the subsequent entire preheating process.

[0060] In one embodiment of the present invention, the driver 32 includes a cylinder, a hydraulic cylinder or a motor. In actual application, the type of the driver 32 can be selected according to the needs.

[0061] In one embodiment of the present invention, in the longitudinal direction of the preheating chamber 19 , the gas outlet 13 is located above the material inlet 14 .

[0062] The gas outlet 13 is formed by an outlet pipe connected to the box body 12, and the material inlet 14 is formed by an inlet pipe plugged into the box body 12, and the lower end of the inlet pipe is plugged into the lower side of the outlet pipe, so as to prevent the material from being entrained by the high-temperature gas and flowing out of the gas outlet 13.

[0063] The lower end of the inlet pipe is provided with a skirt to disperse the materials, and the inner wall of the box body 12 is also provided with a guide surface 18 corresponding to the inlet pipe.

[0064] The utility model also proposes a solid particle calcining system, comprising a closed-loop pipeline, an air intake valve 23, an air distribution device, a heat source supply furnace, a calcining furnace and any one of the above-mentioned preheating furnaces 100. The air intake valve 23 is connected to the air distribution device through a pipeline, and the air intake valve 23 can allow gas to enter the pipeline; the heat source supply furnace includes a plasma generator, and the air intake of the heat source supply furnace is connected to the air distribution device, and the plasma generator is used to ionize the gas transported by the air distribution device to form a heat source gas; 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; the gas material inlet and outlet of the preheating furnace 100 are connected to the gas material inlet and outlet of the calcining furnace, and the preheating furnace 100 is used to use the gas discharged from the calcining furnace to preheat the material to be transported to the calcining furnace, and the gas outlet 13 of the preheating furnace 100 is connected to the air distribution device through a pipeline, and a closed gas circulation route can be formed between the air distribution device, the heat source supply furnace, the calcining furnace and the preheating furnace 100.

[0065] According to the solid mixture calcining system of the present invention, an air intake valve 23 is provided on the pipeline, which can provide gas to the heat source supply furnace at the initial stage of calcination, and 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 generate gas, the air intake valve 23 can be closed, and the gas circulates inside the pipeline. The heat source supply furnace can continue to ionize and heat the gas generated by the calcined 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 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.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A preheating furnace, characterized in that: include: A furnace body, wherein the furnace body is formed with a preheating chamber and a material inlet, a gas outlet, and a material gas inlet and outlet communicated with the preheating chamber; A feeding assembly, the feeding assembly is communicated with the material inlet and is suitable for feeding the furnace body; A material pushing assembly, which is arranged on the furnace body and is used to push the material in the preheating chamber into the material gas inlet and outlet; The gas enters the preheating chamber from the material gas inlet and outlet, and is discharged from the gas outlet after exchanging heat with the material in the preheating chamber.

2. The preheating furnace according to claim 1, characterized in that: The furnace body includes a base and a box body each having an inner cavity. There are multiple boxes, which are connected to the upper surface of the base along the circumference of the base. The material gas inlet and outlet are arranged on the base, and each box body is provided with a material inlet and a gas outlet.

3. The preheating furnace according to claim 2, characterized in that: The base is provided with a guide surface, and the material slides along the guide surface toward the material gas inlet and outlet.

4. The preheating furnace according to claim 1, characterized in that: The feeding assembly comprises a distributor and a conveying pipe. The distributor is arranged above the furnace body and is provided with a feed port and a discharge port. The conveying pipe is connected between the discharge port and the material inlet.

5. The preheating furnace according to claim 4, characterized in that: The feeding assembly also includes two valves which are sequentially arranged on the conveying pipe along the length direction of the conveying pipe, and one of the two valves is opened to feed the material.

6. The preheating furnace according to claim 4, characterized in that: The bottom surface of the distributor is in the shape of a cone protruding upward, the orthographic projection of the feed port coincides with the tip of the cone, and the discharge ports are distributed on the periphery of the bottom surface.

7. The preheating furnace according to claim 1, characterized in that: The pushing assembly includes a push rod and a driver connected to each other. The push rod is connected to the furnace body, and a push head of the push rod extends into the preheating chamber. The push head of the push rod is extended and retracted under the drive of the driver to push the material in the preheating chamber into the material gas inlet and outlet.

8. The preheating furnace according to claim 7, characterized in that: The driver comprises a pneumatic cylinder, a hydraulic cylinder or a motor.

9. The preheating furnace according to claim 1, characterized in that: In the longitudinal direction of the preheating chamber, the gas outlet is located above the material inlet.

10. A solid particle 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 being in communication with a gas outlet of the heat source supply furnace and calcining the solid mixture by the heat source gas; The preheating furnace as described in any one of claims 1 to 9, the gas material inlet and outlet of the preheating furnace are connected with the gas material inlet and outlet of the calcining furnace, the preheating furnace is used to use the gas discharged from the calcining furnace to preheat the material to be transported to the calcining furnace, and the gas outlet of the preheating furnace is connected 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, the calcining furnace and the preheating furnace.

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