Indirect cooling calcined product production system

Abstract

The utility model provides an indirect cooling calcined product production system, and relates to cement production equipment. A separation cyclone; the powder cooler is used for cooling the calcined product separated by the separation cyclone, and comprises a calcined product inlet for introducing the separated calcined product; the calcined product discharge port is used for leading out the cooled calcined product; a cooling air inlet for introducing air or other cooling air for cooling the heat transfer plate; the cooling air outlet is used for leading out the cooling air after heat exchange; the heat transfer pipeline is arranged inside and can isolate calcined products from cooling air; a combustor is arranged at the top of the pre-combustion furnace, a gas inlet of the combustor is communicated to the cooling air outlet through a second pipeline, and hot smoke generated by combustion of the pre-combustion furnace is communicated to a combustion-supporting gas inlet formed in the bottom of the calcining furnace through a third pipeline. According to the production system provided by the utility model, the calcined product is not in direct contact with cooling air during cooling.

Description

Technical Field

[0001] The utility model relates to cement production equipment, in particular to an indirect cooling calcined product production system. Background Art

[0002] The powdery calcined products formed by calcination in various industries are different. Among them, in the cement production industry, calcined clay (such as gray clay) is common.

[0003] Calcined clay has many excellent properties, such as high toughness, high compressive strength and good thermal stability, and is often used to make handicrafts such as pottery and porcelain. In addition, calcined clay is also widely used in medicine, food, chemicals, building materials and environmental protection.

[0004] In the process of implementing the present utility model, the inventors found that there are at least the following problems in the prior art:

[0005] Taking calcined clay as an example, the calcined clay production processes currently include horizontal rotary kiln calcination process and clay suspension calcination process. Among them, the clay suspension calcination system currently on the market refers to the previous cement preheater design mode and is equipped with a multi-stage cooling cyclone, but the cyclone will leak during long-term use, which is not conducive to the atmosphere control in the calcining furnace; in addition, if the iron content in the raw material exceeds 5%, the oxygen in the cooling air will cause the product to change color (the main component transformation process is Fe3O4→Fe2O3), and the LC3 cement produced by adding it to cement clinker has a large color contrast with the gray cement produced in daily production, which seriously affects the quality of cement.

[0006] Therefore, an indirect cooling calcined product production system is needed to at least partially solve the above technical problems. Utility Model Content

[0007] The present application provides an indirect cooling calcined product production system, which can achieve that the calcined product is not directly in contact with cooling air during cooling.

[0008] The utility model provides an indirect cooling calcined product production system, the production system comprising:

[0009] A calcining furnace for calcining the material to be calcined;

[0010] A separation cyclone is used to separate gas and solid from the flue gas mixed with calcined products and hot gas generated by calcining in the calcining furnace;

[0011] The powder cooler is used to cool the calcined product separated by the separation cyclone, including:

[0012] a calcined product inlet provided at the top and connected to the bottom of the separation cyclone via a first pipe, so as to introduce the separated calcined product;

[0013] A calcined product discharge port is provided at the bottom to discharge the calcined product after the temperature is reduced;

[0014] A cooling air inlet is provided at one side end for introducing air or other cooling air for cooling the heat transfer pipe;

[0015] A cooling air outlet is provided at the opposite side end, for discharging the air after heat exchange or other cooling air; and

[0016] A heat transfer pipe is arranged inside to isolate the calcined product from the cooling air;

[0017] wherein the separated calcined product enters the heat transfer pipe through the calcined product inlet and descends, and performs non-contact heat exchange with the cooling air to achieve cooling; and

[0018] A precombustion furnace, wherein a burner equipped with a first fuel inlet and a gas inlet is arranged on the top of the precombustion furnace, the gas inlet of the burner is connected to the cooling air outlet via a second pipe, and the hot flue gas generated by combustion in the precombustion furnace is connected to the combustion-supporting gas inlet arranged at the bottom of the calcining furnace via a third pipe.

[0019] According to the production system of the utility model, the calcining furnace calcines the material to be calcined, and generates flue gas mixed with calcined products and hot air when calcining in the calcining furnace. The flue gas mixed with calcined products and hot air enters the separation cyclone for gas-solid separation, and the separated calcined products enter the powder cooler and perform non-contact heat exchange with the cooling air to achieve cooling. At the same time, the cooling air after heat exchange and temperature increase enters the pre-combustion furnace to provide oxygen for fuel combustion, thereby realizing the first heat recovery and reuse. The high-temperature hot flue gas generated by the combustion of the fuel in the pre-combustion furnace enters the calcining furnace to provide a higher temperature combustion-supporting gas, thereby realizing the second heat recovery and reuse.

[0020] Optionally, the production system further includes a preheating mechanism for preheating the material to be calcined to be fed into the calcining furnace, including at least one preheating cyclone; the preheating mechanism is connected to the separation cyclone via a third pipeline to introduce the hot gas separated by the separation cyclone, and the preheating mechanism is connected to the calcining furnace via a fourth pipeline to transport the material to be calcined after heat exchange with the separated hot gas to the calcining furnace, and the preheating mechanism further includes:

[0021] A conveying channel for introducing the calcined material to be preheated; and

[0022] An exhaust gas outlet is provided for discharging the separated hot gas after heat exchange.

[0023] Optionally, the first fuel inlet is an inlet for introducing conventional fuel. And / or

[0024] The pre-combustion furnace is also provided with an alternative fuel inlet for introducing alternative fuel.

[0025] Optionally, a downwardly inclined multi-step material bed is further provided inside the pre-combustion furnace below the alternative fuel inlet, and an ash outlet is provided at the bottom of the pre-combustion furnace near the lowest point of the step material bed, and the ash outlet is connected to the first pipeline or the calcined product inlet of the powder cooler via a fifth pipeline;

[0026] Wherein, each step of the stepped material bed is provided with an air ejection device for blowing out the alternative fuel.

[0027] Optionally, the preheating mechanism further comprises a plurality of preheating cyclones arranged from top to bottom in the vertical direction, the bottom material outlet of the preheating cyclone located at the bottom is connected to the fourth pipe, the side gas inlet of the preheating cyclone located at the bottom is connected to the third pipe, and the top gas outlet of the preheating cyclone located at the top is connected to the exhaust gas outlet; wherein the top gas outlet of the preheating cyclone located at the bottom is connected to the side gas inlet of the preheating cyclone located at the top through a connecting pipe, and the bottom material outlet of the preheating cyclone located at the top is connected to the connecting pipe located at the bottom;

[0028] The conveying channel for introducing the preheated calcined material is connected to the connecting pipe located at the top.

[0029] Optionally, the calcined product discharge port of the powder cooler is also connected to a storage bin via a zipper machine to store the calcined product.

[0030] Optionally, the exhaust gas outlet is also connected to a fan via a pipeline to provide exhaust driving force;

[0031] The fan is also connected to a chimney via an exhaust gas treatment device to be discharged into the atmosphere.

[0032] Optionally, the conveying channel for introducing the preheated calcined material is also connected to a pre-treatment mechanism via a conveying device, and the pre-treatment mechanism includes a crushing device, a grinding device and / or a drying device.

[0033] Optionally, the calcining furnace is a calcining furnace in a reducing atmosphere.

[0034] Optionally, the material to be calcined is clay raw material.

[0035] By utilizing the technical solution according to the embodiment of the utility model, the beneficial effects that can be obtained are at least:

[0036] 1. According to the production system of the utility model, the powder cooler is used to realize non-contact heat exchange between the calcined product and the cooling air. At the same time, the cooling air after heat exchange and temperature rise enters the pre-combustion furnace, and the high-temperature hot flue gas generated by the combustion of the pre-combustion furnace enters the calcination furnace, providing the calcination furnace with a higher temperature combustion-supporting gas, realizing multiple heat recovery and reuse;

[0037] 2. The preheating mechanism in the production system can, on the one hand, preheat the material to be calcined and continue to reduce the moisture content; on the other hand, it can also realize the heat recovery and reuse of the flue gas mixed with calcined products and hot gas generated by the calcining furnace.

[0038] Additional advantages, purposes, and features of the present invention will be partially described in the following description, and will become partially apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0039] Those skilled in the art will understand that the purposes and advantages that can be achieved by the present invention are not limited to the above specific description, and the above and other purposes that can be achieved by the present invention will be more clearly understood based on the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present invention, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are only for the purpose of illustrating the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may become larger relative to other components in the exemplary device actually manufactured according to the present invention.

[0041] In the attached picture:

[0042] Figure 1 It is an overall schematic diagram of an indirect cooling calcined product production system according to an embodiment of the utility model.

[0043] Description of reference numerals:

[0044] 100. Production system;

[0045] 110. calcining furnace; 111. combustion-supporting gas inlet;

[0046] 120. Separation cyclone;

[0047] 130, powder cooler; 131, calcined product inlet; 132, calcined product discharge port; 133, cooling air inlet; 134, cooling air outlet;

[0048] 140. pre-combustion furnace; 141. burner; 142. alternative fuel inlet; 143. stepped material bed;

[0049] 150, preheating mechanism; 151, preheating cyclone; 152, top gas outlet; 153, bottom material outlet; 154, side gas inlet; 155, connecting pipeline; 156, conveying pipeline; 157, exhaust gas outlet;

[0050] 160. Zipper machine;

[0051] 170. Fan;

[0052] 181, first pipeline; 182, second pipeline; 183, third pipeline; 184, fourth pipeline; 185, fifth pipeline. DETAILED DESCRIPTION

[0053] By referring to the exemplary embodiments, the purposes and functions of the present invention and the methods for achieving these purposes and functions will be explained. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The essence of the description is only to help technicians in the relevant field to comprehensively understand the specific details of the present invention.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0055] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0056] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0057] The utility model provides an indirect cooling calcined product production system 100. The production system 100 can be applied to cement production equipment, such as the production of calcined clay, and the calcined clay is cooled by cooling air in a non-contact manner to solve the problem of discoloration of the calcined clay caused by existing contact air cooling.

[0058] Among them, there are many types of materials to be calcined. Taking the cement production industry as an example, the materials to be calcined include various clay minerals, gypsum and coal gangue. For the convenience of description, the materials to be calcined in the production system 100 of the utility model are clay raw materials as a specific embodiment, and the corresponding calcined product is calcined clay, but this does not represent a limitation. In addition, the calcined clay is ash clay as an example, so that LC3 cement can be produced. Correspondingly, the calcining furnace 110 is a calcining furnace 110 in a reducing atmosphere. It can be understood that the above does not represent a limitation, and can also be applied to other materials to be calcined to produce other types of cement.

[0059] The utility model provides an indirect cooling calcined product production system 100. In a preferred embodiment, Figure 1 As shown, the production system 100 includes a calcining furnace 110, a separation cyclone 120, a powder cooler 130 and a pre-combustion furnace 140. The calcining furnace 110 and the separation cyclone 120 are both conventional devices in the industry, and are respectively used to calcine the clay raw material and to separate the gas-solid from the flue gas mixed with the calcination product and the hot gas generated by the calcining furnace 110. The powder cooler 130 is used to air-cool the calcined clay generated by the calcining furnace 110. The pre-combustion furnace 140 is used to recycle the cooling air (e.g., low-temperature air) in the powder cooler 130.

[0060] refer to Figure 1 In the illustrated embodiment, the powder cooler 130 is vertically arranged. As a device for cooling powder, the working principle is to transfer heat between hot powder (calcined clay) and cooling medium (air) to reduce the temperature of the powder to the required target temperature. The overall configuration and internal structure of the powder cooler 130 are prior art and will not be described in detail here.

[0061] The calcining furnace 110 is used to calcine the clay raw material. The calcining furnace 110 is a vertically extending calcining device, which is a prior art device and is not described in detail here. The calcining furnace 110 calcines the clay raw material at a high temperature (about 800°C). When the clay raw material is dehydroxylated at a high temperature in the calcining furnace 110 in a reducing atmosphere (an oxygen-deficient environment, with an oxygen content generally less than 2%), the iron inside will remain in the magnetite phase state (gray).

[0062] The separation cyclone 120 is used to separate the gas and solid of the flue gas mixed with powdered calcined clay and hot air generated by the calcination in the calcining furnace 110. The separated calcined clay is sent to the powder cooler 130. The separated hot air can be sent to other devices for reuse. Continuing from the above, the calcined clay after dehydroxylation enters the separation cyclone 120 for gas-solid separation, and the separated high-temperature solid phase (temperature of about 800°C) enters the powder flow cooler.

[0063] The powder cooler 130 is used to cool the calcined product separated by the separation cyclone 120. The powder cooler 130 is a device for cooling powder. Its overall configuration and internal structure are prior art, and will not be described in detail below.

[0064] Specifically, the powder cooler 130 includes a calcined product inlet 131, a calcined product discharge port 132, a cooling air inlet 133, a cooling air outlet 134 and a heat transfer pipe. The calcined product inlet 131 is provided at the top of the powder cooler 130 for introducing the separated calcined clay, which is connected to the bottom of the separation cyclone 120 via the first pipe 181. The calcined product discharge port 132 is provided at the bottom of the powder cooler 130 for conducting the calcined clay after the temperature is reduced.

[0065] The cooling air inlet 133 is disposed at one side of the powder cooler 130 for introducing air or other cooling air for cooling the heat transfer pipe and the heat transfer plate. The cooling air outlet 134 is disposed at the other side of the powder cooler 130 for discharging the cooling air after heat exchange.

[0066] A heat transfer pipe (not shown) that can isolate the calcined clay from the cooling air is disposed inside the powder cooler 130. The heat transfer pipe can be a spiral closed pipe extending vertically, with both ends connected to the calcined product inlet 131 and the calcined product discharge port 132, respectively. In order to improve the heat exchange efficiency between the heat transfer pipe and the cooling air, a heat transfer plate (not shown) or heat dissipation fins extending in all directions can also be disposed on the outer peripheral wall of the heat transfer pipe.

[0067] The separated calcined clay enters the heat transfer pipe through the calcined product inlet 131 and descends, and can perform non-contact heat exchange with the cooling air through the heat transfer plate and the heat transfer pipe itself to achieve cooling.

[0068] A burner 141 equipped with a first fuel inlet (not shown) and a gas inlet (not shown) is provided at the top of the pre-combustion furnace 140. The burner 141 equipped with a fuel inlet and a gas inlet is a prior art device. The first fuel inlet may be an inlet for introducing a conventional fuel (such as natural gas, petroleum coke or waste oil). The gas inlet of the burner 141 is connected to the cooling air outlet 134 via a second pipe 182, so that the cooling air (such as air) that is heated after heat exchange and guided out of the cooling air outlet 134 is sent into the burner 141 for fuel combustion. The hot flue gas generated by the combustion of the pre-combustion furnace 140 is connected to the combustion-supporting gas inlet 111 set to the bottom of the calcining furnace 110 via a third pipe 183. The oxygen content in the hot flue gas generated by the combustion of the pre-combustion furnace 140 can be made as low as possible as less than 2%, so as to ensure that the calcining furnace 110 is in a reducing atmosphere. The combustion-supporting gas inlet 111 may be one or more, and in addition to introducing the hot flue gas generated by the combustion of the pre-combustion furnace 140, other combustion-supporting gases may also be connected to ensure the calcination quality.

[0069] Based on the above scheme, the calcining furnace 110 calcines the clay raw material, and generates flue gas mixed with powdered calcined clay and hot air when calcining in the calcining furnace 110. The flue gas mixed with calcined clay and hot air enters the separation cyclone 120 for gas-solid separation. The separated calcined clay enters the powder cooler 130 and performs non-contact heat exchange with the cooling air to achieve cooling. At the same time, the cooling air after heat exchange and heating enters the pre-combustion furnace 140 to provide oxygen for fuel combustion, thereby achieving the first heat recovery and reuse. The high-temperature hot flue gas generated by the combustion of the fuel in the pre-combustion furnace 140 enters the calcining furnace 110, providing a higher temperature combustion-supporting gas, thereby achieving the second heat recovery and reuse.

[0070] According to the production system 100 of the present invention, the calcined clay can be cooled in the powder cooler 130 without being directly in contact with the cooling air, and has the function of heat recovery and reuse.

[0071] Continue to refer Figure 1In the illustrated embodiment, the production system 100 may further include a preheating mechanism 150 for preheating the clay raw material to be fed into the calcining furnace 110. The preheating mechanism 150 includes at least one preheating cyclone 151. For example, a plurality of preheating cyclones 151 arranged vertically and spaced apart. The preheating mechanism 150 is connected to the separation cyclone 120 via a third pipe 183 to introduce the hot gas separated by the separation cyclone 120. The preheating mechanism 150 is connected to the calcining furnace 110 via a fourth pipe 184 to transport the clay raw material that has undergone heat exchange with the separated hot gas to the calcining furnace 110. The preheating mechanism 150 may further include a conveying channel (such as a pipe) for introducing the clay raw material to be preheated and an exhaust gas outlet 157 for exporting the separated hot gas that has undergone heat exchange. Preferably, the conveying channel for introducing the clay raw material to be preheated may also be connected to the pre-treatment mechanism via a conveying device. The pre-treatment mechanism may include a crushing device, a grinding device and / or a drying device to crush, grind and / or dry the clay raw material. The conveying device may be a conveying belt, an air chute or other devices.

[0072] Further, the preheating mechanism 150 may include a plurality of preheating cyclones 151 arranged from top to bottom in the vertical direction. The bottom material outlet 153 of the preheating cyclone 151 located at the bottom is connected to the fourth pipe 184. The side gas inlet 154 of the preheating cyclone 151 located at the bottom is connected to the third pipe 183. The top gas outlet 152 of the preheating cyclone 151 located at the top is connected to the exhaust gas outlet 157. The top gas outlet 152 of the preheating cyclone 151 located at the bottom is connected to the side gas inlet 154 of the preheating cyclone 151 located at the top through the connecting pipe 155. The bottom material outlet 153 of the preheating cyclone 151 located at the top is connected to the connecting pipe 155 located at the bottom. The conveying channel for introducing the raw clay material to be preheated is connected to the connecting pipe 155 located at the top.

[0073] The heat exchange efficiency is improved by designing the preheating mechanism 150 to be a suspended heat exchange form including a plurality of preheating cyclones 151 arranged from top to bottom in the vertical direction.

[0074] In order to reduce the use of traditional fuels, the pre-combustion furnace 140 may also be provided with an alternative fuel inlet 142 for introducing alternative fuels.

[0075] In a preferred embodiment, since the water content of the alternative fuel is relatively high, the general burnout rate is not high. Based on this, a downwardly inclined multi-step bed 143 can also be set at the position below the alternative fuel inlet 142 inside the pre-combustion furnace 140. An ash outlet can be set at the bottom of the pre-combustion furnace 140 near the lowest point of the step bed 143. The ash outlet can be connected to the first pipeline 181 or the calcined product inlet 131 of the powder cooler 130 via the fifth pipeline 185. Among them, each step of the step bed 143 is equipped with an air ejection device for purging the alternative fuel. The purge gas (such as compressed gas) ejected by the air ejection device blows down the alternative fuel at the corresponding step, causing it to fall down into the step of the next level of the step bed 143. Through the cooperation of the step bed 143 and the air ejection device, the alternative fuel is continuously dried and burned during the continuous falling process, which greatly improves the burnout rate of the alternative fuel.

[0076] The calcined product discharge port 132 of the powder cooler 130 is also connected to a storage bin (not shown) via a zipper machine 160. The calcined clay (temperature below 100°C) cooled by the powder cooler 130 enters the zipper machine 160 from the calcined product discharge port 132 of the powder cooler 130 and is then transported to the storage bin to store the calcined clay.

[0077] The exhaust gas outlet 157 can also be connected to the fan 170 via a pipeline, and the flue gas drawn by the fan 170 and passing through the preheating cyclone 151 is discharged from the exhaust gas outlet 157. The fan 170 can also be connected to the chimney via an exhaust gas treatment device to be discharged into the atmosphere. The exhaust gas treatment device can include, for example, a desulfurization device, a denitrification device and / or a dust removal device.

[0078] Next, we will refer to Figure 1 , briefly describe part of the working process of the production system 100:

[0079] Step 1: The raw clay material is first pre-treated (crushing, grinding, drying, etc.) and then sent to a suspended calcination preheating mechanism via a conveying device to further remove moisture from the raw clay material, so that the moisture content of the raw clay material can be controlled to be less than 1%.

[0080] Step 2: The preheated clay raw material falls into the calcining furnace, which is in a reducing atmosphere (oxygen content is less than 2%). In the reducing atmosphere at about 800°C, when the clay raw material is dehydroxylated at high temperature, the iron inside will remain in the magnetite phase (gray).

[0081] Step 3: The calcined clay formed after dehydroxylation enters the separation cyclone for gas-solid separation. The separated high-temperature solid-phase calcined clay (temperature of about 800°C) enters the powder cooler. The material slowly descends under the action of gravity and performs indirect heat exchange (without direct contact) with the cooling air through heat transfer pipes and heat transfer plates to recover heat from the calcined clay.

[0082] Step 4: The cooling air after heat exchange enters the pre-combustion furnace to provide oxygen for fuel combustion, while reducing traditional fuel consumption.

[0083] Step 5: The fuel (alternative fuel and traditional fossil fuel) is burned in the pre-combustion furnace, and the hot flue gas enters from the bottom of the calciner.

[0084] Step 6: The low-temperature calcined clay (temperature below 100°C) cooled by the powder cooler enters the zipper machine from the discharge port of the powder cooler and is transported to the storage bin for storage.

[0085] Step 7: The hot gas generated by the calcination in the calcining furnace 110 enters the preheating mechanism to exchange heat with the clay raw material, and then is drawn by the fan and discharged from the exhaust gas outlet; after the exhaust gas treatment (desulfurization, denitrification, dust removal, etc.), it is discharged into the atmosphere through the chimney.

[0086] In summary, according to the production system 100 of the embodiment of the utility model, compared with the traditional cooling cyclone, the use of the powder cooler 130 reduces the system air leakage rate, which is beneficial to the atmosphere control in the calcining furnace 110. At the same time, the indirect cooling method of the powder cooler 130 is adopted to effectively avoid oxygen contacting the calcined clay and prevent the calcined clay from changing color again. In addition, the cooling air after heat exchange and heating enters the pre-combustion furnace 140, and the high-temperature hot flue gas generated by the combustion of the fuel in the pre-combustion furnace 140 enters the calcining furnace 110, providing the calcining furnace 110 with a higher temperature combustion-supporting gas, and the flue gas generated by the calcination of the calcining furnace 110 enters the preheating mechanism 150 to exchange heat with the clay raw material, realizing multiple heat recovery and reuse.

[0087] In combination with the description and practice of the utility model disclosed herein, other embodiments of the utility model are easy to think of and understand for those skilled in the art. The description and embodiments are considered to be exemplary only, and the true scope and spirit of the utility model are defined by the claims.

Claims

1. An indirect cooling calcined product production system, characterized in that: The production system comprises: A calcining furnace for calcining the material to be calcined; A separation cyclone is used to separate gas and solid from the flue gas mixed with calcination products and hot gas generated by calcination in the calcining furnace; The powder cooler is used to cool the calcined product separated by the separation cyclone, including: a calcined product inlet provided at the top and connected to the bottom of the separation cyclone via a first pipe, so as to introduce the separated calcined product; A calcined product discharge port is provided at the bottom to discharge the calcined product after the temperature is reduced; A cooling air inlet is provided at one side end for introducing air or other cooling air for cooling the heat transfer pipe; A cooling air outlet is provided at the opposite side end, for discharging the air after heat exchange or other cooling air; and A heat transfer pipe is arranged inside to isolate the calcined product from the cooling air; wherein the separated calcined product enters the heat transfer pipe through the calcined product inlet and descends, and performs non-contact heat exchange with the cooling air to achieve temperature reduction; and A precombustion furnace, wherein a burner equipped with a first fuel inlet and a gas inlet is arranged on the top of the precombustion furnace, the gas inlet of the burner is connected to the cooling air outlet via a second pipe, and the hot flue gas generated by combustion in the precombustion furnace is connected to the combustion-supporting gas inlet arranged at the bottom of the calcining furnace via a third pipe.

2. The production system according to claim 1, characterized in that: The calcining furnace further comprises a preheating mechanism for preheating the material to be calcined to be fed into the calcining furnace, comprising at least one preheating cyclone; the preheating mechanism is connected to the separation cyclone through a third pipeline to introduce the hot gas separated by the separation cyclone, and the preheating mechanism is connected to the calcining furnace through a fourth pipeline to transport the material to be calcined after heat exchange with the separated hot gas to the calcining furnace, and the preheating mechanism further comprises: A conveying channel for introducing the material to be calcined to be preheated; and An exhaust gas outlet is provided for discharging the separated hot gas after heat exchange.

3. The production system according to claim 1, characterized in that: The first fuel inlet is an inlet for introducing conventional fuel; and / or The pre-combustion furnace is also provided with an alternative fuel inlet for introducing alternative fuel.

4. The production system according to claim 3, characterized in that: A downwardly inclined multi-step material bed is further provided inside the pre-combustion furnace below the alternative fuel inlet, and an ash outlet is provided at the bottom of the pre-combustion furnace near the lowest point of the step material bed, and the ash outlet is connected to the first pipeline or the calcined product inlet of the powder cooler via a fifth pipeline; Wherein, each step of the stepped material bed is provided with an air ejection device for blowing out the alternative fuel.

5. The production system according to claim 2, characterized in that: Further, the preheating mechanism includes a plurality of preheating cyclones arranged from top to bottom in the vertical direction, the bottom material outlet of the preheating cyclone located at the bottom is connected to the fourth pipe, the side gas inlet of the preheating cyclone located at the bottom is connected to the third pipe, and the top gas outlet of the preheating cyclone located at the top is connected to the exhaust gas outlet; wherein the top gas outlet of the preheating cyclone located at the bottom is connected to the side gas inlet of the preheating cyclone located at the top through a connecting pipe, and the bottom material outlet of the preheating cyclone located at the top is connected to the connecting pipe located at the bottom; The conveying channel for introducing the preheated calcined material is connected to the connecting pipe located at the top.

6. The production system according to any one of claims 1 to 5, characterized in that: The calcined product discharge port of the powder cooler is also connected to a storage bin via a zipper machine to store the calcined product; and / or The heat transfer pipe is a spiral closed pipe extending vertically, with two ends respectively connected to the calcined product inlet and the calcined product discharge port. A heat transfer plate or heat dissipation fin is also arranged on the outer peripheral wall of the heat transfer pipe.

7. The production system according to claim 2, characterized in that: The exhaust gas outlet is also connected to the fan via a pipeline to provide exhaust driving force; The fan is also connected to a chimney via an exhaust gas treatment device to be discharged into the atmosphere.

8. The production system according to claim 2, characterized in that: The conveying channel for introducing the calcined material to be preheated is also connected to a pre-treatment mechanism via a conveying device, and the pre-treatment mechanism includes a crushing device, a grinding device and / or a drying device.

9. The production system according to claim 1, characterized in that: The calcining furnace is a calcining furnace in a reducing atmosphere.

10. The production system according to claim 1, characterized in that: The material to be calcined is clay raw material.

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