Composite gypsum flue gas calcination cooling kiln
By using the countercurrent heat exchange technology of the composite gypsum flue gas calcination and cooling kiln, the problem of performance changes of gypsum clinker during transportation has been solved, resulting in reduced equipment costs and energy consumption, simplified processes, and more precise control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-03-03
AI Technical Summary
In existing gypsum calcination equipment, the gypsum clinker undergoes changes in performance due to contact with moisture in the air during transportation, which also increases equipment investment and energy consumption, and complicates process control.
A composite gypsum flue gas calcination and cooling kiln is adopted, which utilizes flue gas and air to enhance heat exchange elements to achieve countercurrent heat exchange. In the calcination section, the gypsum raw material flows countercurrently with the high-temperature flue gas, and in the cooling section, it flows countercurrently with the cold air. The calcination and cooling process is completed by one piece of equipment, avoiding contact between the clinker and the air.
This has achieved stable performance of gypsum clinker, reduced equipment costs and energy consumption, simplified process control, and reduced equipment investment and operating costs.
Smart Images
Figure CN223963421U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of gypsum calcination equipment, and in particular to a composite gypsum flue gas calcination and cooling kiln. Background Technology
[0002] A rotary kiln is a thermal device used for calcining gypsum, and its shape is basically the same as that of rotary kilns used for drying or firing cement and lime. A rotary kiln is a furnace that rotates continuously. In gypsum powder production, the continuous rotation of the rotary kiln ensures that the gypsum raw material is heated evenly within the kiln, completing the calcination process. Parameters such as the kiln's rotation speed, temperature control, and feeding rate are all key factors affecting the quality of gypsum calcination.
[0003] Currently, regardless of whether it is a one-step gypsum calcination kiln or a two-step gypsum fluidized bed calcination furnace, the discharge temperature of the gypsum powder produced from gypsum raw materials is basically around 140℃. After discharge, it is conveyed to a special cooling device to complete the cooling of the gypsum clinker. After cooling, the temperature range of the gypsum clinker is 80-100℃. During the conveying process, the gypsum clinker comes into contact with water vapor in the air, and its properties change to a certain extent. It is impossible to achieve stable control of the performance of the building gypsum powder. In addition, the intermediate conveying increases the equipment investment cost, makes the process control cumbersome, and increases the product energy consumption. Utility Model Content
[0004] The purpose of this invention is to provide a composite gypsum flue gas calcination and cooling kiln, which can prevent gypsum clinker from coming into contact with moisture in the air during transportation, thus avoiding changes in the properties of the gypsum clinker.
[0005] This utility model provides a composite gypsum flue gas calcination and cooling kiln, comprising:
[0006] The feeding section is used to feed gypsum raw materials into the calcination section of the kiln. The inner cavity of the calcination section is equipped with a flue gas enhanced heat exchange element. A cooling section is provided at one end of the calcination section, and a discharge port is provided at one end of the cooling section. The material discharged from the lower end of the discharge port is sent to the clinker silo for storage via a conveying device.
[0007] Preferably, one end of the flue gas enhanced heat exchange element is provided with a high-temperature flue gas inlet, the high-temperature flue gas inlet being located opposite to the gypsum raw material inlet, and the other end of the flue gas enhanced heat exchange element is provided with a flue gas outlet.
[0008] Preferably, the flue gas outlet is connected to a dust removal device.
[0009] Preferably, the cooling section is provided with an air-enhanced heat exchange element. One end of the air-enhanced heat exchange element is provided with an air inlet. The air inlet flows in the opposite direction to the gypsum clinker conveying direction. The other end of the air-enhanced heat exchange element is provided with an air outlet, which is connected to the outside.
[0010] Preferably, a kiln tail air inlet is provided on the side of the discharge box at the upper end of the discharge port, and a water vapor outlet is provided at the upper end of the feeding unit's casing. The water vapor outlet is connected to a dust removal device through a pipeline.
[0011] Preferably, the upper ends of the calcination section and the cooling section are respectively provided with tires, and the tires are matched with the tug wheels.
[0012] Preferably, a large gear ring is provided in the middle of the calcination section and the cooling section. The large gear ring meshes with a small gear for transmission. The small gear is driven by a motor and a reducer.
[0013] Preferably, a calcination temperature measuring port is provided at the front end of the cooling section, and a cooling temperature measuring port is provided at the rear end of the cooling section. Temperature sensors are installed at the ends of both the calcination temperature measuring port and the cooling temperature measuring port.
[0014] Preferably, the upper end of the casing of the feeding unit is provided with a feeding port, and the lower end of the feeding port is provided with a screw conveyor, which is driven to rotate and feed materials by a driving device provided at its end.
[0015] This utility model provides a composite gypsum flue gas calcination and cooling kiln. First, gypsum raw materials are fed into the calcination section of the composite rotary kiln via a feeding section. The calcination section is equipped with flue gas enhanced heat exchange elements. After counter-current heat exchange between the gypsum raw materials and the high-temperature flue gas inside the enhanced heat exchange elements, the temperature of the gypsum raw materials is heated from room temperature to approximately 140°C. During this process, the gypsum undergoes a phase change, transforming from dihydrate gypsum to hemihydrate gypsum. This process completes the calcination of the gypsum raw materials. The calcined hemihydrate gypsum then undergoes counter-current heat exchange with room temperature air and air-enhanced heat exchange elements arranged at the kiln tail. The temperature of the hemihydrate gypsum decreases from 140°C to approximately 80°C. The water-soluble gypsum has stable properties. It is discharged from the discharge port of the rotary kiln and then sent to the clinker silo for storage via a conveying device. One device solves the work that previously required two devices, reducing both manufacturing and operating costs. The device has built-in enhanced heat exchange elements, which improves the overall heat transfer coefficient and significantly reduces equipment costs. The flow direction of the material inside the device is opposite to that of the heat exchange gas, i.e., the material flows counter-currently with the hot flue gas and with the cold air, achieving counter-current heat exchange. This results in high heat utilization and reduced energy and electricity consumption. It also saves on the conveying equipment in the intermediate link from the calcination kiln discharge to the cooler in the traditional gypsum calcination process, reducing overall equipment investment, simplifying the process, and making control more precise. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.
[0018] Figure 2 This is a schematic diagram of the distribution structure of the flue gas enhanced heat exchange element in an embodiment of this utility model.
[0019] Figure 3 This is a schematic diagram of the distribution structure of the air-enhanced heat exchange elements in an embodiment of this utility model.
[0020] Figure 4 This is a schematic diagram of the feeding section structure according to an embodiment of the present utility model.
[0021] Figure descriptions: 100, Feeding section; 110, Screw conveyor; 120, Feed inlet; 130, Water vapor outlet; 200, Calcination section; 210, High-temperature flue gas inlet; 220, Flue gas outlet; 230, Flue gas enhanced heat exchange element; 300, Cooling section; 310, Air inlet; 320, Air outlet; 330, Air enhanced heat exchange element; 340, Kiln tail air inlet; 350, Discharge outlet; 400, Large gear ring; 500, Calcination temperature measuring port; 600, Cooling temperature measuring port; 700, Tire. Detailed Implementation
[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0023] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.
[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0025] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.
[0026] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.
[0027] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a composite gypsum flue gas calcination and cooling kiln of this utility model.
[0028] like Figures 1-4 As shown, this utility model embodiment provides a composite gypsum flue gas calcination and cooling kiln, including a feeding section 100 for feeding gypsum raw materials into a calcination section 200 inside the kiln. The calcination section 200 is used to heat the gypsum raw materials. The inner cavity of the calcination section 200 is provided with a flue gas enhanced heat exchange element 230 for heating the gypsum raw materials. One end of the calcination section 200 is provided with a cooling section 300 for cooling gypsum clinker. One end of the cooling section 300 is provided with a discharge port 350 for discharging the cooled gypsum clinker. The material discharged from the lower end of the discharge port 350 is sent to a clinker silo for storage via a conveying device.
[0029] One end of the flue gas enhanced heat exchange element 230 is provided with a high-temperature flue gas inlet 210, which is located opposite to the gypsum raw material inlet end. The other end of the flue gas enhanced heat exchange element 230 is provided with a flue gas outlet 220 for discharging high-temperature flue gas.
[0030] The cooling section 300 is equipped with an air-enhanced heat exchange element 330 for cooling gypsum clinker. One end of the air-enhanced heat exchange element 330 is provided with an air inlet 310 for introducing ambient temperature air. The air inlet 310 flows in the opposite direction to the gypsum clinker conveying direction to achieve countercurrent heat exchange between the gypsum clinker and the ambient temperature air. The other end of the air-enhanced heat exchange element 330 is provided with an air outlet 320 for discharging high temperature air. The air outlet 320 is connected to the outside to discharge the high temperature air.
[0031] First, the gypsum raw material is fed into the calcination section 200 of the compound rotary kiln via the feeding section 100. The calcination section 200 is equipped with flue gas enhanced heat exchange elements 230. After counter-current heat exchange between the gypsum raw material and the high-temperature flue gas inside the flue gas enhanced heat exchange elements 230, the temperature of the gypsum raw material is heated from room temperature to approximately 140°C. During this process, the gypsum undergoes a phase change, transforming from dihydrate gypsum (CaSO4·2H2O) to hemihydrate gypsum (CaSO4·1 / 2H2O). This process completes the calcination of the gypsum raw material. The calcined hemihydrate gypsum then undergoes counter-current heat exchange with room temperature air and the air enhanced heat exchange elements 330 arranged at the kiln tail, causing the temperature of the hemihydrate gypsum to decrease from 140°C to 80°C. At around ℃, the cooled hemihydrate gypsum has stable properties and is discharged through the 350° discharge port of the rotary kiln discharge box. It is then conveyed into the clinker silo for storage. One piece of equipment solves the work that previously required two pieces of equipment, reducing both manufacturing and operating costs. The equipment has built-in enhanced heat exchange elements, which improves the overall heat transfer coefficient and greatly reduces equipment costs. The flow direction of the material inside the equipment is opposite to that of the heat exchange gas, i.e., the material flows counter-currently with the hot flue gas and the cold air, achieving counter-current heat exchange. This results in high heat utilization and reduced energy and electricity consumption. It also saves on the conveying equipment in the intermediate link from the calcination kiln discharge to the cooler in the traditional gypsum calcination process, reducing overall equipment investment, simplifying the process, and making control more precise.
[0032] The flue gas outlet 220 is connected to the dust removal equipment, which filters the flue gas before discharge, thus protecting the environment.
[0033] The upper end of the discharge box at the discharge port 350 is equipped with a kiln tail air inlet 340 for introducing cold air. The kiln tail air inlet 340 can be connected to the water vapor generated after heat exchange in the calcination section 200. The upper end of the feeding section 100 is equipped with a water vapor outlet 130. The water vapor outlet 130 is connected to the dust removal equipment through a pipeline to reduce the temperature of the exhaust gas, thereby reducing the volatilization and emission of harmful substances and meeting environmental protection requirements. Water vapor and other moisture are discharged in time and connected to the dust removal equipment through a pipeline, which can effectively prevent moisture from corroding the internal components of the system, protect key equipment from damage, and thus extend the service life of the equipment.
[0034] The upper ends of the calcination section 200 and the cooling section 300 are respectively equipped with tires 700, which are matched with trolleys to drive the operation and support of the rotary kiln.
[0035] A large gear ring 400 is provided in the middle of the calcination section 200 and the cooling section 300 to drive the rotary kiln to rotate. The large gear ring 400 meshes with a small gear for transmission. The small gear is driven by a motor and a reducer. The motor is driven by a frequency converter to adjust the rotation speed of the rotary kiln.
[0036] The front end of the cooling section 300 is equipped with a calcination temperature measuring port 500 for measuring the temperature of the clinker, and for measuring the temperature of the gypsum clinker conveyed by the calcination section 200. The rear end of the cooling section 300 is equipped with a cooling temperature measuring port 600 for measuring the temperature of the cooled gypsum clinker. Temperature sensors are installed at the ends of both the calcination temperature measuring port 500 and the cooling temperature measuring port 600 for measuring the temperature inside the kiln. The temperature sensors are connected to corresponding instruments to transmit the temperature to the instruments for display, which facilitates the control of the internal temperature of the rotary kiln.
[0037] The upper end of the feeding unit 100 is provided with an inlet 120 for feeding gypsum raw materials, and the lower end of the inlet 120 is provided with a screw conveyor 110 for conveying the gypsum raw materials. The screw conveyor 110 is driven to rotate and feed the materials by a drive device provided at its end.
[0038] The working principle of a composite gypsum flue gas calcination and cooling kiln is as follows: First, gypsum raw material is fed into the calcination section 200 of the composite rotary kiln via the feeding section 100. Flue gas enhanced heat exchange elements 230 are arranged within the calcination section 200. After counter-current heat exchange between the gypsum raw material and the high-temperature flue gas inside the flue gas enhanced heat exchange elements 230, the temperature of the gypsum raw material is heated from room temperature to approximately 140℃. During this process, the gypsum undergoes a phase change, transforming from dihydrate gypsum (CaSO4·2H2O) to hemihydrate gypsum (CaSO4·1 / 2H2O). This process completes the calcination of the gypsum raw material. The calcined hemihydrate gypsum undergoes counter-current heat exchange with room temperature air and the air enhanced heat exchange elements 330 arranged at the kiln tail, thus reducing the temperature of the hemihydrate gypsum. The temperature is reduced from 140℃ to about 80℃, and the cooled hemihydrate gypsum has stable properties. It is discharged through the discharge port 350 of the rotary kiln discharge box and sent to the clinker silo for storage by the conveying equipment. One machine solves the work that originally required two machines, reducing both the manufacturing and operating costs. The machine has built-in enhanced heat exchange elements, which improves the overall heat transfer coefficient and greatly reduces the cost. The flow direction of the material inside the machine is opposite to that of the heat exchange gas, that is, the material flows countercurrently with the hot flue gas and the material flows countercurrently with the cold air, realizing countercurrent heat exchange. The heat utilization rate is high, and the energy and electricity consumption are reduced. It saves the conveying equipment in the intermediate link from the calcination kiln discharge to the cooler in the traditional gypsum calcination process. The overall equipment investment is reduced, the process is simpler, and the control is more precise.
[0039] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.
Claims
1. A composite gypsum flue gas calcination and cooling kiln, characterized in that, include: The feeding section is used to feed gypsum raw materials into the calcination section of the kiln. The inner cavity of the calcination section is equipped with a flue gas enhanced heat exchange element. A cooling section is provided at one end of the calcination section, and a discharge port is provided at one end of the cooling section. The material discharged from the lower end of the discharge port is sent to the clinker silo for storage via a conveying device.
2. The composite gypsum flue gas calcination and cooling kiln according to claim 1, characterized in that, One end of the flue gas enhanced heat exchange element is provided with a high-temperature flue gas inlet, the high-temperature flue gas inlet being located opposite to the gypsum raw material inlet, and the other end of the flue gas enhanced heat exchange element is provided with a flue gas outlet.
3. The composite gypsum flue gas calcination and cooling kiln according to claim 2, characterized in that, The flue gas outlet is connected to the dust removal equipment.
4. A composite gypsum flue gas calcination and cooling kiln according to claim 3, characterized in that, The cooling section is equipped with an air-enhanced heat exchange element. One end of the air-enhanced heat exchange element is provided with an air inlet, and the air inlet flows in the opposite direction to the gypsum clinker conveying direction. The other end of the air-enhanced heat exchange element is provided with an air outlet, and the air outlet is connected to the outside.
5. A composite gypsum flue gas calcination and cooling kiln according to claim 4, characterized in that, The upper end of the discharge box at the discharge port is provided with a kiln tail air inlet, and the upper end of the feeding unit is provided with a water vapor outlet, which is connected to the dust removal equipment through a pipe.
6. A composite gypsum flue gas calcination and cooling kiln according to claim 5, characterized in that, The upper ends of the calcination section and the cooling section are respectively provided with tires, which are matched with the tugs.
7. A composite gypsum flue gas calcination and cooling kiln according to claim 6, characterized in that, A large gear ring is provided in the middle of the calcination section and the cooling section. The large gear ring meshes with a small gear for transmission. The small gear is driven by a motor and a reducer.
8. A composite gypsum flue gas calcination and cooling kiln according to claim 7, characterized in that, The front end of the cooling section is provided with a calcination temperature measuring port, and the rear end of the cooling section is provided with a cooling temperature measuring port. Temperature sensors are installed at the ends of both the calcination temperature measuring port and the cooling temperature measuring port.
9. A composite gypsum flue gas calcination and cooling kiln according to claim 8, characterized in that, The upper end of the casing of the feeding unit is provided with a feeding port, and the lower end of the feeding port is provided with a screw conveyor. The screw conveyor is driven to rotate and feed material by a drive device provided at its end.