Indirect heat exchange system for powdered materials

Abstract

The utility model provides an indirect heat exchange system suitable for powdery materials, and relates to cement production equipment, including: a reactor for calcining raw materials; a separation cyclone for gas-solid separation of flue gas mixed with powdery materials and hot gas generated by the reactor; a spiral conveying heat exchanger for cooling the powdery materials separated by the separation cyclone, including a closed heat exchanger shell, a spiral blade for conveying powdery materials arranged horizontally in the heat exchanger shell, the heat exchanger shell and / or the spiral blade being a hollow structure through which heat transfer oil can pass or having a flow channel for heat transfer oil to pass inside; a closed circulation pipeline extending to the inside of the air-cooled heat exchange tower and connected to the heat transfer oil inlet and the heat transfer oil outlet is arranged on one side of the air-cooled heat exchange tower to realize heat exchange with air introduced into the air-cooled heat exchange tower. According to the system provided by the utility model, it can be realized that the powdery materials are not in contact with oxygen when cooling, and the heat exchange heat can be reused at the same time.

Description

Technical Field

[0001] The utility model relates to cement production equipment, in particular to an indirect heat exchange system suitable for powdery materials. Background Art

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

[0003] Calcined clay has many excellent properties, such as high toughness, high compressive strength and good thermal stability. It is often used to make handicrafts such as pottery and porcelain, and to replace clinker in the cement industry. 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 of powdered material, the raw clay is calcined in a calcining equipment in a reducing atmosphere to generate high-temperature powdered calcined clay (generally 600-900°C), and then it needs to be cooled to below 300 degrees in a reducing atmosphere to ensure that the calcined clay is gray, so that the cement formed after replacing part of the clinker does not affect the color of the cement. Once the calcined clay comes into contact with oxygen during cooling, or is in an oxidizing atmosphere, the calcined clay reacts with oxygen to form iron oxide, and its color changes from gray to reddish brown, affecting the subsequent cement quality. At present, most of the equipment for cooling calcined clay adopts air heat exchange cooling, so it is necessary to strictly control the oxygen content therein, resulting in high control difficulty and corresponding control cost. In addition, the heat transferred by heat exchange between calcined clay and cooling equipment is mostly discharged directly in the form of hot gas, and the heat is not effectively utilized, resulting in a waste of resources.

[0006] Therefore, an indirect heat exchange system suitable for powdered materials is needed to at least partially solve the above technical problems. Utility Model Content

[0007] The present application provides an indirect heat exchange system suitable for powdered materials, which can achieve the powdered materials not coming into contact with air during cooling and achieve heat exchange heat reuse.

[0008] The utility model provides an indirect heat exchange system suitable for powdery materials, the system comprising:

[0009] A reactor for calcining raw materials, the reactor comprising a raw material inlet provided at one side of a furnace body and a fume outlet provided at the top of the furnace body; wherein the raw material inlet is used to introduce raw materials, and the fume outlet is used to discharge fume mixed with powdered materials and hot gas generated by calcination in the reactor;

[0010] The separation cyclone is used to separate the gas and solid from the flue gas mixed with powdered materials and hot air produced by the reaction furnace;

[0011] One or more spiral conveying heat exchangers connected in series and / or in parallel are used to cool the powdered material separated by the separation cyclone, and the spiral conveying heat exchanger comprises:

[0012] A closed heat exchanger shell, wherein spiral blades for conveying powdered materials are horizontally arranged in the heat exchanger shell;

[0013] a powder material inlet provided to one side of the heat exchanger housing along the length direction and connected to the bottom outlet of the separation cyclone through a first pipe, so as to introduce the separated powder material;

[0014] A powder material outlet is provided on the other side of the heat exchanger shell along the length direction, for outputting the powder material after cooling;

[0015] A heat transfer oil inlet is provided to one side of the heat exchanger shell along the length direction, for introducing heat transfer oil for indirect cooling of the powdered material; and

[0016] A heat transfer oil outlet is provided on the other side of the heat exchanger shell along the length direction, and is used to discharge the heat transfer oil after heat exchange;

[0017] Wherein, the heat exchanger shell and / or the spiral blade is a hollow structure through which the heat transfer oil can pass or has a flow channel for the heat transfer oil to pass therein, and the hollow structure and / or the flow channel are respectively connected to the heat transfer oil inlet and the heat transfer oil outlet; and

[0018] An air-cooled heat exchange tower, wherein an air inlet for introducing air to be heat exchanged is arranged at the bottom of the air-cooled heat exchange tower, an air outlet for conducting the air after heat exchange is arranged at the top of the air-cooled heat exchange tower, and a closed circulation pipeline connected to a heat transfer oil inlet and a heat transfer oil outlet and extending to the interior of the air-cooled heat exchange tower is arranged on one side of the air-cooled heat exchange tower, so as to realize heat exchange between the heat transfer oil and the air introduced into the air-cooled heat exchange tower.

[0019] According to the system of the utility model, the reactor calcines the raw materials, and generates flue gas mixed with powdered materials and hot air when the reactor is calcining. The flue gas mixed with powdered materials and hot air enters the separation cyclone for gas-solid separation, and the separated high-temperature powdered materials (generally 600-900°C) enters the spiral conveying heat exchanger, and performs non-contact heat exchange with the heat transfer oil to achieve cooling until it is cooled to below 300°C, and it is achieved without contact with oxygen during cooling. At the same time, the heat transfer oil after heat exchange and temperature increase circulates through the air-cooled heat exchange tower, and exchanges heat with the air introduced into the air-cooled heat exchange tower, so that the room temperature air introduced into the air-cooled heat exchange tower can be heated to about 300°C, and the heated air in the air-cooled heat exchange tower can be discharged through the air outlet and connected to subsequent equipment for reuse.

[0020] Optionally, the system further comprises a preheating mechanism for preheating the raw materials to be fed into the reactor, comprising at least one preheating cyclone; the preheating mechanism is connected to the separation cyclone via a second pipeline to introduce the hot gas separated by the separation cyclone, the preheating mechanism is connected to the raw material inlet of the reactor via a third pipeline to transport the raw materials that have undergone heat exchange with the separated hot gas to the reactor, and the preheating mechanism further comprises:

[0021] A conveying pipeline for introducing raw materials to be preheated; and

[0022] An exhaust port for discharging the separated hot gas after heat exchange.

[0023] Optionally, the preheating mechanism 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 third pipe, the side gas inlet of the preheating cyclone located at the bottom is connected to the second pipe, and the top gas outlet of the preheating cyclone located at the top is connected to the exhaust port; 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;

[0024] Wherein, the conveying pipeline for introducing the raw materials to be preheated is connected to the connecting pipeline located at the top.

[0025] Optionally, the powdered material inlet and the heat transfer oil outlet are arranged on the same side of the heat exchanger shell, and the powdered material outlet and the heat transfer oil inlet are arranged on the same side of the heat exchanger shell.

[0026] Optionally, the combustion chamber at the bottom of the reaction furnace is also connected to the combustion heating furnace via a fourth pipe to supplement heat.

[0027] Optionally, the exhaust port is also connected to a fan via a pipeline, and is connected to an exhaust gas recycling device through the fan, so as to achieve the recycling of the exhaust gas discharged from the exhaust port.

[0028] Optionally, the air outlet at the top of the air-cooled heat exchange tower is also connected to at least one of the following via a pipeline:

[0029] Second pipeline;

[0030] The fourth pipeline;

[0031] Fan.

[0032] Optionally, the thermal oil outlet is also connected to a cooling device via a pipeline, and the cooling device includes at least one cooling cyclone.

[0033] Optionally, the raw material is clay raw material, and the powdery material is calcined clay.

[0034] By utilizing the technical solution according to the embodiment of the utility model, the beneficial effects that can be obtained are at least:

[0035] 1. According to the system of the utility model, high-temperature powdered materials enter the spiral conveying heat exchanger and perform non-contact heat exchange with the heat transfer oil to achieve cooling, so that the heat transfer oil, which has been heated by heat exchange, circulates through the air-cooled heat exchange tower and exchanges heat with the air introduced into the air-cooled heat exchange tower to heat up the normal-temperature air and achieve reuse;

[0036] 2. The preheating mechanism in the system can preheat the raw materials to continue to reduce the moisture content, and on the other hand, it can also realize the heat recovery and reuse of the flue gas mixed with powdered materials and hot air generated by the calcination of the reactor.

[0037] 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.

[0038] 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

[0039] 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.

[0040] In the attached picture:

[0041] Figure 1 It is an overall schematic diagram of a system according to an embodiment of the utility model.

[0042] Description of reference numerals:

[0043] 100. System;

[0044] 110, reactor; 111, raw material inlet; 112, flue gas outlet;

[0045] 120. Separation cyclone;

[0046] 130. Screw conveying heat exchanger; 131. Heat exchanger housing; 132. Screw blades; 133. Powdered material inlet; 134. Powdered material outlet; 135. Heat transfer oil inlet; 136. Heat transfer oil outlet;

[0047] 140. air-cooling heat exchange tower; 141. air inlet; 142. air outlet; 143. circulation pipeline;

[0048] 150. preheating mechanism; 151. preheating cyclone; 152. conveying pipeline; 153. exhaust port; 154. connecting pipeline;

[0049] 161. Combustion heating furnace; 162. Fan;

[0050] 170. Cooling device; 171. Cooling cyclone;

[0051] 181, first pipeline; 182, second pipeline; 183, third pipeline; 184, fourth pipeline. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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".

[0055] 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.

[0056] The utility model provides an indirect heat exchange system 100 suitable for powdered materials. The system 100 can be applied to cement production equipment, such as calcined clay production, and the calcined clay is cooled non-contactly using high temperature resistant heat transfer oil to solve the problem of calcined clay discoloration caused by existing contact air cooling.

[0057] There are many types of powder materials. For ease of description, taking the cement production industry as an example, the powder materials in the system 100 of the embodiment of the utility model below are calcined clay as a specific implementation method, and the corresponding raw material is clay raw material. It can be understood that the above does not represent a limitation.

[0058] The utility model provides an indirect heat exchange system 100 suitable for powdered materials. In a preferred embodiment, Figure 1 As shown, the system 100 includes a reactor 110, a separation cyclone 120, a spiral conveying heat exchanger 130 and an air-cooled heat exchange tower 140. The reactor 110 and the separation cyclone 120 are 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 powdered calcined clay and hot gas generated by the calcination of the reactor 110. The spiral conveying heat exchanger 130 is used to perform non-contact heat exchange and cooling of the calcined clay generated by the reactor 110 using heat transfer oil. The air-cooled heat exchange tower 140 is used to recover and reuse the heat of the heat transfer oil in the spiral conveying heat exchanger 130.

[0059] refer to Figure 1In the illustrated embodiment, the reaction furnace 110 (for example, an incinerator) is used to calcine the clay raw material. The reaction furnace 110 is a calcination device arranged to extend vertically. It is a prior art device and will not be described in detail here. Generally, the reaction furnace 110 includes a raw material inlet 111 provided to one side of the furnace body. The reaction furnace 110 also includes a smoke outlet 112 provided to the top of the furnace body. Among them, the raw material inlet 111 is used to introduce the clay raw material. The smoke outlet 112 is used to guide the smoke mixed with calcined clay and hot gas generated by the calcination of the reaction furnace 110.

[0060] The separation cyclone 120 is used to separate gas and solid from the flue gas mixed with powdered calcined clay and hot air generated by the calcination of the reaction furnace 110. The separated calcined clay is sent to the screw conveying heat exchanger 130. The separated hot air can be sent to other devices for reuse.

[0061] The spiral conveyor heat exchanger 130 is used to cool the calcined clay separated by the separation cyclone 120. The spiral conveyor heat exchanger 130 is a non-air-cooled cooling device for cooling powders. Its overall configuration and internal structure are prior art and will not be described in detail below.

[0062] Specifically, the spiral conveying heat exchanger 130 includes a closed heat exchanger shell 131, a powder material inlet 133, a powder material outlet 134, a heat transfer oil inlet 135 and a heat transfer oil outlet 136. A spiral blade 132 for conveying calcined clay is horizontally arranged in the heat exchanger shell 131.

[0063] The powder material inlet 133 is provided at one side of the heat exchanger housing 131 along the length direction, and is connected to the bottom outlet of the separation cyclone 120 via the first pipe 181 to introduce the calcined clay separated by the separation cyclone 120. The powder material outlet 134 is provided at the other side of the heat exchanger housing 131 along the length direction, and is used to output the calcined clay after the temperature is reduced.

[0064] The heat transfer oil inlet 135 is provided at one side of the heat exchanger housing 131 along the length direction, for introducing the heat transfer oil for indirectly cooling the calcined clay. The heat transfer oil outlet 136 is provided at the other side of the heat exchanger housing 131 along the length direction, for discharging the heat transfer oil after heat exchange.

[0065] The heat exchanger housing 131 and / or the spiral blades 132 are hollow structures (not shown) through which the heat transfer oil can pass, or have a flow channel (not shown) inside for the heat transfer oil to pass through. The hollow structure and / or the flow channel are connected to the heat transfer oil inlet 135 and the heat transfer oil outlet 136 respectively.

[0066] For example, the heat exchanger housing 131 and the spiral blades 132 are both hollow structures, and the heat transfer oil can circulate through the hollow structures.

[0067] Figure 1 The specific embodiment of a two-stage spiral conveying heat exchanger 130 is shown. The calcined clay heated to 600-900°C enters the upper spiral conveying heat exchanger 130. During the horizontal conveying of the calcined clay, the high-temperature calcined clay fully exchanges heat with the high-temperature heat-conducting oil and then enters the lower spiral conveying heat exchanger 130 to exchange heat with the circulating high-temperature heat-conducting oil again until the calcined clay is cooled to below 300°C. It can be understood that Figure 1 The two-stage series-connected spiral heat exchanger 130 shown does not represent a limitation. According to actual needs, it can be a single spiral heat exchanger 130, or two or more parallel-connected spiral heat exchangers 130, or more than two series-connected spiral heat exchangers 130, or multiple spiral heat exchangers 130 both in series and in parallel.

[0068] In order to achieve a better cooling effect, the powder material inlet 133 and the heat transfer oil outlet 136 can be arranged on the same side of the heat exchanger housing 131. The powder material outlet 134 and the heat transfer oil inlet 135 can be arranged on the same side of the heat exchanger housing 131. It can be understood that Figure 1 Only one specific embodiment of a two-stage serially connected spiral transport heat exchanger 130 is shown, and the distribution of the outlets and inlets shown in the figure does not represent a limitation.

[0069] The air-cooled heat exchange tower 140 includes a tower body. An air inlet 141 for introducing air to be heat exchanged is provided at the bottom of the tower body. An air outlet 142 for conducting the air after heat exchange is provided at the top of the tower body. A closed circulation pipeline 143 connected to the heat transfer oil inlet 135 and the heat transfer oil outlet 136 and extending to the inside of the air-cooled heat exchange tower 140 is provided on one side of the air-cooled heat exchange tower 140 to achieve heat exchange between the heat transfer oil and the air introduced into the air-cooled heat exchange tower 140. Among them, the overall configuration and internal structure of the air-cooled heat exchange tower 140 are prior art and are not described in detail here.

[0070] Based on the above scheme, the reactor 110 calcines the clay raw material, and the reactor 110 generates flue gas mixed with powdered calcined clay and hot air when calcining. The flue gas mixed with calcined clay and hot air enters the separation cyclone 120 for gas-solid separation, and the separated high-temperature powdered calcined clay (generally 600-900°C) enters the spiral conveying heat exchanger 130, and performs non-contact heat exchange with the heat transfer oil to achieve cooling until it is cooled to below 300°C, so that it does not contact with the air during cooling. At the same time, the heat transfer oil after heat exchange and heating circulates through the air-cooled heat exchange tower 140, and exchanges heat with the air introduced into the air-cooled heat exchange tower 140, so that the room temperature air introduced into the air-cooled heat exchange tower 140 can be heated to about 300°C, and the heated air in the air-cooled heat exchange tower 140 can be discharged through the air outlet 142 and connected to subsequent equipment for reuse.

[0071] According to the system 100 of the utility model, the calcined clay can be cooled in the spiral conveying heat exchanger 130 without being directly in contact with the air, and has the function of heat recovery and reuse.

[0072] Continue to refer Figure 1 In the illustrated embodiment, the system 100 may further include a preheating mechanism 150 for preheating the clay raw material to be fed into the reaction 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 second pipe 182 to introduce the hot gas separated by the separation cyclone 120. The preheating mechanism 150 is connected to the reaction furnace 110 via a third pipe 183 to transport the clay raw material that has undergone heat exchange with the separated hot gas to the reaction furnace 110. The preheating mechanism 150 may further include a conveying pipe 152 for introducing the clay raw material to be preheated and an exhaust port 153 for conducting the separated hot gas that has undergone heat exchange. Preferably, the conveying pipe 152 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.

[0073] 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 of the preheating cyclone 151 located at the bottom is connected to the third pipe 183. The side gas inlet of the preheating cyclone 151 located at the bottom is connected to the second pipe 182. The top gas outlet of the preheating cyclone 151 located at the top is connected to the exhaust port 153. The top gas outlet of the preheating cyclone 151 located at the bottom is connected to the side gas inlet of the preheating cyclone 151 located at the top through the connecting pipe 154. The bottom material outlet of the preheating cyclone 151 located at the top is connected to the connecting pipe 154 located at the bottom. The conveying pipe 152 for introducing the raw clay material to be preheated is connected to the connecting pipe 154 located at the top.

[0074] 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.

[0075] Understandably, Figure 1 Only one specific embodiment of a two-stage preheating cyclone 151 is shown, but this does not represent a limitation. The preheating mechanism 150 can also be in the form of a three-stage or more preheating cyclone 151 .

[0076] In a preferred embodiment, the combustion chamber at the bottom of the reaction furnace 110 can also be connected to the combustion heating furnace 161 via a fourth pipe 184 to supplement heat when the combustion heat of the reaction furnace 110 itself is insufficient.

[0077] According to a preferred embodiment of the present invention, the exhaust port 153 can also be connected to the fan 162 via a pipeline, and connected to the exhaust gas recycling device through the fan 162, so as to realize the recycling of the exhaust gas discharged from the exhaust port 153. The exhaust gas recycling device is a prior art device, and its specific form is not limited. For example, it can be a steam generating device that uses the heat contained in the exhaust gas to generate steam, a hot water generating device that generates hot water, etc.

[0078] Continue to refer Figure 1 In order to reuse the air heated by the air-cooling heat exchange tower 140 after heat exchange, the air outlet 142 at the top of the air-cooling heat exchange tower 140 can also be connected to the second pipe 182, the fourth pipe 184 and the fan 162 via a pipe. It can be understood that the air outlet 142 at the top of the air-cooling heat exchange tower 140 can also be connected to any one or two of the second pipe 182, the fourth pipe 184 and the fan 162.

[0079] Furthermore, the heat transfer oil outlet 136 can also be connected to the cooling device 170 via a pipeline to continue cooling for subsequent use. The cooling device 170 can include at least one cooling cyclone 171. It can be understood that the cooling device 170 can be in the same form as the preheating mechanism 150, and is designed to include a plurality of cooling cyclones 171 arranged vertically from top to bottom for heat exchange, thereby improving the heat exchange efficiency. The calcined clay whose temperature is reduced to below 300°C can be guaranteed not to be oxidized and discolored by air. The calcined clay whose temperature is reduced to below 300°C is transported to the air cooling device 170 via a pipeline to continue cooling to below 100°C and then transported away for subsequent use.

[0080] Next, we will refer to Figure 1 , briefly describe part of the working process of system 100:

[0081] Step 1: Clay raw material enters the multi-stage preheating cyclone 151 from the top, is heated step by step, and then enters the reaction furnace 110 for calcination.

[0082] Step 2: The calcined clay heated to 600-900°C is separated by the separation cyclone 120 and enters the first-stage spiral conveying heat exchanger 130. During the horizontal conveying of the calcined clay, the high-temperature calcined clay and the heat-resistant heat-conducting oil fully exchange heat and then enter the second-stage spiral conveying heat exchanger 130 to exchange heat with the circulating heat-resistant heat-conducting oil again. If the temperature is too high, the spiral conveying heat exchanger 130 can be added until the calcined clay is cooled to below 300°C.

[0083] Step 3: The heat exchanger shell 131 and the spiral blades 132 of the spiral conveying heat exchanger 130 are hollow structures, and high-temperature resistant heat transfer oil is passed inside to ensure that the calcined clay is indirectly heat-exchanged with the heat transfer oil when being transported in the spiral conveying heat exchanger 130. The heated heat transfer oil circulates into the air-cooled heat exchange tower 140, and heats the room temperature air entering the air-cooled heat exchange tower 140 to about 300°C. The air heated to about 300°C is transported through pipelines to the multi-stage preheating cyclone 151 for drying the clay raw material, the reaction furnace 110 for heating the calcined clay, and the fan 162 for reuse.

[0084] Step 4: The calcined clay whose temperature is reduced to below 300° C. is guaranteed not to be oxidized and discolored by air, and is transported to a conventional air cooling device 170 to be cooled to below 100° C. and then transported away for subsequent use.

[0085] In summary, according to the system 100 of the embodiment of the utility model, the high-temperature calcined clay enters the spiral conveying heat exchanger 130, and performs non-contact heat exchange with the heat transfer oil to achieve cooling, so that it does not contact with oxygen during cooling. At the same time, the heat transfer oil after heat exchange and heating circulates through the air-cooled heat exchange tower 140, and heat exchanges with the air introduced into the air-cooled heat exchange tower 140 to heat the normal temperature air. The heated air is transported through a pipeline to the multi-stage preheating cyclone 151 for drying the clay raw material, the reactor 110 for heating the calcined clay, and the fan 162 for reuse. In addition, the multi-stage preheating cyclone 151 in the system 100 can preheat the clay raw material on the one hand, and on the other hand, it can also realize the heat recovery and reuse of the flue gas mixed with powdered calcined clay and hot gas generated by the calcination of the reactor 110.

[0086] 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 heat exchange system suitable for powdered materials, characterized in that: The system comprises: A reactor for calcining raw materials, the reactor comprising a raw material inlet provided at one side of a furnace body for introducing raw materials, and a fume outlet provided at the top of the furnace body; wherein the fume outlet is used to discharge fume mixed with powdered materials and hot air generated by calcining in the reactor; The separation cyclone is used to separate the gas and solid from the flue gas mixed with powdered materials and hot air produced by the reaction furnace; One or more spiral conveying heat exchangers connected in series and / or in parallel are used to cool the powdered material separated by the separation cyclone, and the spiral conveying heat exchanger comprises: A closed heat exchanger shell, wherein spiral blades for conveying powdered materials are horizontally arranged in the heat exchanger shell; a powder material inlet provided to one side of the heat exchanger housing along the length direction and connected to the bottom outlet of the separation cyclone through a first pipe, so as to introduce the separated powder material; A powder material outlet is provided on the other side of the heat exchanger shell along the length direction, and is used to discharge the powder material after cooling; A heat transfer oil inlet is provided to one side of the heat exchanger shell along the length direction, for introducing heat transfer oil for indirect cooling of the powdered material; and A heat transfer oil outlet is provided on the other side of the heat exchanger shell along the length direction, and is used to discharge the heat transfer oil after heat exchange; Wherein, the heat exchanger shell and / or the spiral blade is a hollow structure through which the heat transfer oil can pass or has a flow channel for the heat transfer oil to pass therein, and the hollow structure and / or the flow channel are respectively connected to the heat transfer oil inlet and the heat transfer oil outlet; and An air-cooled heat exchange tower, wherein an air inlet for introducing air to be heat exchanged is arranged at the bottom of the air-cooled heat exchange tower, an air outlet for conducting the air after heat exchange is arranged at the top of the air-cooled heat exchange tower, and a closed circulation pipeline connected to a heat transfer oil inlet and a heat transfer oil outlet and extending to the interior of the air-cooled heat exchange tower is arranged on one side of the air-cooled heat exchange tower, so as to realize heat exchange between the heat transfer oil and the air introduced into the air-cooled heat exchange tower.

2. The system according to claim 1, characterized in that The invention also includes a preheating mechanism for preheating the raw materials to be fed into the reactor, including at least one preheating cyclone; the preheating mechanism is connected to the separation cyclone through a second pipeline to introduce the hot air separated by the separation cyclone, and the preheating mechanism is connected to the raw material inlet of the reactor through a third pipeline to transport the raw materials after heat exchange with the separated hot air to the reactor, and the preheating mechanism also includes: A conveying pipeline for introducing raw materials to be preheated; and An exhaust port for discharging the separated hot gas after heat exchange.

3. The system according to claim 2, characterized in that Further, the preheating mechanism 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 third pipe, the side gas inlet of the preheating cyclone located at the bottom is connected to the second pipe, and the top gas outlet of the preheating cyclone located at the top is connected to the exhaust port; 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; Wherein, the conveying pipeline for introducing the raw materials to be preheated is connected to the connecting pipeline located at the top.

4. The system according to claim 1, characterized in that The powder material inlet and the heat transfer oil outlet are arranged on the same side of the heat exchanger shell, and the powder material outlet and the heat transfer oil inlet are arranged on the same side of the heat exchanger shell.

5. The system according to claim 1, characterized in that The combustion chamber at the bottom of the reaction furnace is also connected to the combustion heating furnace via a fourth pipeline to supplement heat.

6. The system according to claim 2, characterized in that The exhaust port is also connected to a fan via a pipeline, and is connected to an exhaust gas recycling device through the fan, so as to achieve the recycling of the exhaust gas discharged from the exhaust port.

7. The system according to claim 6, characterized in that The air outlet at the top of the air-cooled heat exchange tower is also connected to at least one of the following via a pipeline: Second pipeline; The fourth pipeline; Fan.

8. The system according to any one of claims 1 to 7, characterized in that The thermal oil outlet is also connected to a cooling device via a pipeline, and the cooling device includes at least one cooling cyclone.

9. The system according to claim 1, characterized in that The raw material is clay raw material, and the powdery material is calcined clay.

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