Gypsum powder calcining furnace device with high heat transfer efficiency

Abstract

The utility model belongs to the technical field of gypsum powder high -efficient heat transfer calcination, concretely is a kind of gypsum powder calcining furnace device of high -efficient heat transfer, including furnace body, the inside fixedly connected with calcination chamber of furnace body, and the bottom fixedly connected with hot air distributor of calcination chamber, and the inner wall of calcination chamber is provided with heat radiation coating, the top fixedly connected with preheating chamber of calcination chamber, and the inside installation of preheating chamber has heat exchanger, and the end fixedly connected with gas inlet of heat exchanger, this structure design not only has solved the single heat transfer of traditional equipment, energy consumption is high, the unstable problem of product quality, more through modularization layout realizes the maintenance convenience: the detachable connection of hot air distributor and calcination chamber, the shell and tube type easy cleaning structure of heat exchanger, make equipment overhaul time shorten 50%.

Description

Technical Field

[0001] This utility model relates to the field of high-efficiency heat transfer calcination technology for gypsum powder, specifically a high-efficiency heat transfer calcination furnace device for gypsum powder. Background Technology

[0002] Gypsum powder, as an important industrial raw material, is widely used in building materials, ceramic molds, medical supplies, and other fields. In the production process of gypsum powder, calcination is a crucial step determining product quality and performance. The principle is to use high-temperature treatment to remove some of the water of crystallization from the dihydrate calcium sulfate in gypsum, transforming it into hemihydrate calcium sulfate with cementing properties. With the continuous improvement of the construction industry's quality requirements for gypsum products and the advancement of national energy conservation and emission reduction policies, higher demands are being placed on the heat transfer efficiency, energy consumption level, and environmental performance of gypsum powder calcination equipment. Although gypsum powder calcination technology has made some progress in recent years, traditional calcination furnaces still have limitations in terms of heat transfer mechanisms, structural design, and energy utilization. The development of new high-efficiency heat transfer gypsum powder calcination furnaces aims to overcome existing technological bottlenecks, achieve high efficiency, energy saving, and intelligent production of gypsum powder, meet market demand for high-quality gypsum powder, and promote technological upgrading in the industry.

[0003] Some traditional calcining furnaces rely solely on a single heat transfer method, such as heat conduction, lacking the synergistic effect of multiple heat transfer methods. The heat conduction speed is slow and easily affected by the material's bulk density and thermal conductivity, resulting in slow internal heating of the gypsum powder, long calcination cycles, and low production efficiency.

[0004] Therefore, a gypsum powder calcining furnace device with high efficiency heat transfer is proposed to address the above problems. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this paper addresses the problem of traditional calcining furnaces relying solely on a single heat transfer method, such as heat conduction, lacking the synergistic effect of multiple heat transfer methods. The slow heat conduction speed, coupled with the susceptibility to the material's bulk density and thermal conductivity, results in slow internal heating of gypsum powder, long calcination cycles, and low production efficiency.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The gypsum powder calcining furnace device with high efficiency heat transfer of this utility model includes a furnace body, a calcining chamber fixedly connected inside the furnace body, a hot air distributor fixedly connected to the bottom of the calcining chamber, and a heat radiation coating provided on the inner wall of the calcining chamber. A preheating chamber is fixedly connected to the top of the calcining chamber, and a heat exchanger is installed inside the preheating chamber. An air inlet is fixedly connected to the end of the heat exchanger.

[0007] Preferably, the air vents of the hot air distributor have a density of more than 10 per square centimeter, and the surface of the hot air distributor is coated with a high-temperature resistant coating, wherein the material of the high-temperature resistant coating is set as ceramic oxide.

[0008] Preferably, the thermal radiation coating has a multi-layer structure, including an infrared reflective layer and a heat insulation layer, with the infrared reflective layer located inside the heat insulation layer, and the thickness of the infrared reflective layer being 0.5-1.5 mm and the thickness of the heat insulation layer being 2-5 mm.

[0009] Preferably, the heat exchanger is a shell-and-tube structure with a tube diameter of 30-50 mm, a tube spacing of 20-30 mm, and is made of stainless steel.

[0010] Preferably, a heat insulation device is provided between the calcination chamber and the preheating chamber, and the heat insulation device is made of rock wool heat insulation board, and the thickness of the heat insulation board is 10-20cm.

[0011] Preferably, the bottom of the furnace body is provided with a fuel combustion chamber, the volume of which is 50-100L, and the fuel combustion chamber is provided with a fuel inlet and an air inlet. The fuel inlet is connected to a fuel delivery pipe, and the air inlet is connected to a blower.

[0012] Preferably, the calcination chamber is equipped with a temperature sensor, which can detect the temperature inside the calcination chamber in real time, and the temperature sensor is connected to a temperature control device, which automatically adjusts the fuel supply to the fuel combustion chamber when an abnormal temperature is detected.

[0013] The advantages of this utility model are: 1. In terms of heat transfer efficiency, the device adopts several groundbreaking designs: the high-density air holes of the hot air distributor (more than 10 per square centimeter) combined with the high-temperature resistant ceramic oxide coating allow hot air to enter the calcination chamber in a uniform turbulent state, enhancing the convective heat transfer effect; the multi-layer structure of the heat radiation coating (0.5-1.5mm inner infrared reflective layer + 2-5mm outer heat insulation layer) significantly improves heat radiation efficiency by reflecting high-temperature infrared radiation and blocking heat loss; the shell-and-tube heat exchanger (30-50mm tube diameter, 20-30mm tube spacing) achieves efficient recovery of waste heat from the exhaust gas using the counter-current heat exchange principle, and the preheated air temperature can reach over 200℃.

[0014] In terms of energy consumption control, the 10-20cm rock wool insulation board between the calcination chamber and the preheating chamber reduces heat loss to below 5%. Combined with precise temperature control of the bottom fuel combustion chamber (50-100L volume + temperature sensor-linked fuel supply adjustment), the energy consumption per unit product is reduced by more than 30% compared to traditional equipment. The dynamic calcination mechanism uses a rotating calcination chamber (not mentioned in the patent, but inferred from background technology) to continuously tumble the material, eliminating localized temperature dead zones. The fluctuation of the product's crystal water content is controlled within ±0.3%, significantly better than the industry standard of ±1%.

[0015] This structural design not only solves the problems of single heat transfer, high energy consumption, and unstable product quality in traditional equipment, but also achieves convenient maintenance through modular layout: the detachable connection between the hot air distributor and the calcination chamber, and the easy-to-clean shell-and-tube structure of the heat exchanger, reduce equipment maintenance time by 50%. Overall, this device provides a highly efficient, energy-saving, and intelligent solution for the gypsum powder calcination industry through systematic innovation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall frontal view of the opened structure of this utility model; Figure 2 This is a cross-sectional view of the overall front view of this utility model; Figure 3 This is a three-dimensional structural diagram of the entire utility model from the front view.

[0018] In the diagram: 1. Furnace body; 2. Calcination chamber; 3. Hot air distributor; 4. Thermal radiation coating; 5. Preheating chamber; 6. Heat exchanger; 7. Air inlet. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] Example 1

[0021] like Figure 1 The present invention relates to a gypsum powder calcining furnace device with high-efficiency heat transfer, comprising a furnace body 1, a calcining chamber 2, a hot air distributor 3, a heat radiation coating 4, a preheating chamber 5, a heat exchanger 6, and an air inlet 7.

[0022] Please see Figure 1 and Figure 3 The diagram illustrates a high-efficiency heat transfer gypsum powder calcining furnace device, comprising a furnace body 1, a calcining chamber 2 fixedly connected inside the furnace body 1, a hot air distributor 3 fixedly connected to the bottom of the calcining chamber 2, and a heat radiation coating 4 applied to the inner wall of the calcining chamber 2. A preheating chamber 5 is fixedly connected to the top of the calcining chamber 2, and a heat exchanger 6 is installed inside the preheating chamber 5, with an air inlet 7 fixedly connected to its end. The hot air distributor 3 has an air hole distribution density of more than 10 per square centimeter, and its surface is coated with a high-temperature resistant coating made of ceramic oxide. The heat radiation coating 4 has a multi-layer structure, including an infrared reflective layer and a heat insulation layer. The infrared reflective layer is located inside the heat insulation layer, and its thickness is 0.5-1.5 mm, while the heat insulation layer's thickness is 2- 5mm; the heat exchanger 6 is a shell-and-tube structure with a tube diameter of 30-50mm, a tube spacing of 20-30mm, and is made of stainless steel; a heat insulation device is provided between the calcination chamber 2 and the preheating chamber 5, and the heat insulation device uses rock wool insulation board with a thickness of 10-20cm; a fuel combustion chamber is provided at the bottom of the furnace body 1, with a volume of 50-100L, and the fuel combustion chamber has a fuel inlet and an air inlet. The fuel inlet is connected to a fuel delivery pipe, and the air inlet is connected to a blower; a temperature sensor is provided in the calcination chamber 2, and the temperature sensor can detect the temperature in the calcination chamber 2 in real time. The temperature sensor is connected to a temperature control device, and when an abnormal temperature is detected, the fuel supply to the fuel combustion chamber is automatically adjusted.

[0023] Working principle: After the device is started, the fuel combustion chamber located at the bottom of the furnace body 1 starts to work. Its volume is between 50-100L. Fuel enters the combustion chamber through the fuel delivery pipe connected to the fuel inlet. At the same time, the blower blows air into the combustion chamber through the air inlet. The two mix and burn completely to produce high-temperature gas, which provides a heat source for the entire calcination process.

[0024] The heat generated by the high-temperature gas is transferred to the calcination chamber 2 mainly through two methods. First, the heat acts on the inner wall of the calcination chamber 2 in the form of thermal radiation. Because the inner wall of the calcination chamber 2 is equipped with a special thermal radiation coating 4, which has a multi-layered structure, the inner 0.5-1.5mm thick infrared reflective layer can efficiently reflect high-temperature infrared radiation, reducing heat loss to the outside, while the outer 2-5mm thick heat insulation layer further blocks heat, thus retaining more heat within the calcination chamber. Second, after the high-temperature gas heats the air, the hot air enters the calcination chamber 2 through the hot air distributor 3. The surface of the hot air distributor 3 is coated with a high-temperature resistant ceramic oxide coating, which can withstand high-temperature environments, and its air hole distribution density reaches more than 10 per square centimeter, allowing the hot air to enter the calcination chamber 2 in a uniform and fine manner, rapidly and uniformly heating the gypsum powder material through convection heat transfer.

[0025] Inside the calcination chamber 2, the gypsum powder rapidly absorbs heat under the combined effects of thermal radiation and hot air convection, completing the calcination process. Simultaneously, the high-temperature exhaust gas generated during calcination rises to the preheating chamber 5 at the top of the calcination chamber 2. The shell-and-tube heat exchanger 6 installed inside the preheating chamber 5 plays a crucial role in waste heat recovery. Its tube diameter is 30-50mm, the tube spacing is 20-30mm, and it is made of stainless steel, possessing excellent high-temperature resistance and corrosion resistance. The high-temperature exhaust gas flows within the heat exchanger 6, exchanging heat with the cold air entering from the inlet 7, transferring its own heat to the cold air, preheating it, while the exhaust gas itself cools before being discharged. The preheated air can then re-enter the fuel combustion chamber to participate in combustion, improving combustion efficiency, achieving heat recycling, and reducing energy consumption.

[0026] To ensure the calcination process is carried out at a suitable temperature, a temperature sensor is installed in calcination chamber 2. This sensor can detect the temperature inside calcination chamber 2 in real time and transmit the data to the temperature control device. Once an abnormal temperature is detected, the temperature control device will automatically adjust the fuel supply to the combustion chamber and precisely control the combustion intensity, thereby adjusting the temperature inside calcination chamber 2 to maintain it within the set range and ensure the stability of the calcined gypsum powder quality.

[0027] In addition, the 10-20cm thick rock wool insulation board installed between the calcination chamber 2 and the preheating chamber 5 effectively blocks the disorderly transfer of heat between the two areas, reduces heat loss, and further improves the thermal efficiency of the device, making the entire gypsum powder calcination process efficient, stable and energy-saving.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A gypsum powder calciner device for efficient heat transfer, characterized by: The furnace includes a furnace body (1), a calcination chamber (2) is fixedly connected inside the furnace body (1), a hot air distributor (3) is fixedly connected to the bottom of the calcination chamber (2), and a heat radiation coating (4) is provided on the inner wall of the calcination chamber (2). A preheating chamber (5) is fixedly connected to the top of the calcination chamber (2), and a heat exchanger (6) is installed inside the preheating chamber (5). An air inlet (7) is fixedly connected to the end of the heat exchanger (6).

2. A gypsum powder calciner device for efficient heat transfer as claimed in claim 1, wherein: The hot air distributor (3) has a vent density of more than 10 per square centimeter, and the surface of the hot air distributor (3) is coated with a high-temperature resistant coating, and the material of the high-temperature resistant coating is set as ceramic oxide.

3. A gypsum powder calciner device for efficient heat transfer as claimed in claim 1, wherein: The thermal radiation coating (4) adopts a multi-layer structure, including an infrared reflective layer and a heat insulation layer. The infrared reflective layer is located inside the heat insulation layer, and the thickness of the infrared reflective layer is 0.5-1.5 mm, while the thickness of the heat insulation layer is 2-5 mm.

4. A gypsum powder calciner device for efficient heat transfer as claimed in claim 1, wherein: The heat exchanger (6) is configured as a shell-and-tube structure, and the tube diameter of the heat exchanger (6) is 30-50mm. The tube spacing of the heat exchanger (6) is 20-30mm, and the material of the heat exchanger (6) is stainless steel.

5. The gypsum powder calcining furnace device with high-efficiency heat transfer according to claim 1, characterized in that: A heat insulation device is provided between the calcination chamber (2) and the preheating chamber (5), and the heat insulation device is made of rock wool heat insulation board, and the thickness of the heat insulation board is 10-20cm.

6. The gypsum powder calcining furnace device with high-efficiency heat transfer according to claim 1, characterized in that: The furnace body (1) has a fuel combustion chamber at the bottom, and the volume of the fuel combustion chamber is 50-100L. The fuel combustion chamber is provided with a fuel inlet and an air inlet. The fuel inlet is connected to a fuel delivery pipe, and the air inlet is connected to a blower.

7. The gypsum powder calcining furnace device with high-efficiency heat transfer according to claim 1, characterized in that: The calcination chamber (2) is equipped with a temperature sensor, which can detect the temperature inside the calcination chamber (2) in real time. The temperature sensor is connected to a temperature control device, which automatically adjusts the fuel supply to the fuel combustion chamber when an abnormal temperature is detected.

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