Efficient and energy-saving bell jar type atmosphere sintering furnace

Abstract

The efficient and energy-saving bell jar type atmosphere sintering furnace comprises a kiln body, a plurality of preheating cavities located in heat insulation bricks are formed in the top end of the interior of the kiln body, air inlets communicated with an inner cavity of the kiln body are formed in the bottoms of the preheating cavities, and the upper end of the kiln body is connected with an air inlet pipe communicated with the preheating cavities. The air inlet end of the air inlet pipe is provided with a compressed air connecting end, the bottom of the kiln body is provided with an air outlet pipe communicated with the interior of the kiln body, and the air outlet end of the air outlet pipe is connected with a fan. The preheating cavity is arranged, inlet air can be preheated through the temperature in the kiln body, and therefore the temperature difference between the inlet air temperature and the temperature in the kiln body is reduced, and product cracking is avoided; the air inlet is formed in the top of the kiln body, the air outlet is formed in the bottom of the kiln body, and during air exchange, the relative temperature of air in the kiln body is cold at the upper part and hot at the lower part, so that rapid exchange of the air is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of bell-type atmosphere sintering furnaces, and in particular relates to a high-efficiency and energy-saving bell-type atmosphere sintering furnace. Background Art

[0002] In order to respond to the country's call to build a resource-saving and environmentally friendly society, electric heating kiln equipment, which consumes a lot of energy, has become the research focus of energy-saving and consumption-reducing innovation work for kiln manufacturers and kiln users.

[0003] The bell-shaped atmosphere sintering furnace (hereinafter referred to as the bell-shaped furnace) is an electrically heated sintering furnace with high power and high electricity consumption. Therefore, energy saving and consumption reduction have great practical significance for the use of bell-shaped furnaces. In view of the existing characteristics of bell-shaped furnaces, kiln manufacturers have achieved good energy-saving effects through in-depth research on the furnace structure and furnace temperature control methods. For example, after reasonable structural improvements and the application of the "multi-stage splicing voltage regulation technology" to its temperature control system, while significantly increasing the production capacity of a single furnace, it effectively improves the high-order harmonics existing during chopping voltage regulation, improves energy utilization, and thus effectively saves energy consumption per unit output, achieving a good comprehensive energy-saving effect.

[0004] Existing bell-shaped furnaces have some problems in practical application. For example, during rapid ventilation, the temperature difference between the gas at the air inlet and the temperature inside the kiln cavity is too large, which can easily cause the product to crack. Utility Model Content

[0005] The purpose of this utility model is to provide a high-efficiency and energy-saving bell-shaped atmosphere sintering furnace to solve the problems raised in the above background technology. The utility model provides a high-efficiency and energy-saving bell-shaped atmosphere sintering furnace with the characteristics of reducing the temperature difference between the inlet air and the furnace, thereby avoiding product cracking.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-efficiency and energy-saving bell-type atmosphere sintering furnace, comprising a kiln body, the interior of the kiln body is paved with insulating bricks, the top of the interior of the kiln body is provided with a plurality of preheating cavities located in the insulating bricks, the bottom of the preheating cavity is provided with an air inlet connected to the inner cavity of the kiln body, the upper end of the kiln body is connected to an air inlet pipe connected to the preheating cavity, the air inlet end of the air inlet pipe is provided with a compressed air connection end, the bottom of the kiln body is provided with an air outlet pipe connected to the interior of the kiln body, and the air outlet end of the air outlet pipe is connected to a fan.

[0007] In order to inject an appropriate amount of nitrogen for protection in the high temperature section and the cooling stage, a high-pressure nitrogen connection end is further provided on the intake end of the intake pipe.

[0008] In order to control the inlet and outlet of air, an air inlet control valve is further installed on the air inlet pipe, the compressed air connection end and the high-pressure nitrogen connection end. An air outlet control valve is installed on the air outlet pipe.

[0009] In order to facilitate cleaning of the air outlet pipe, a cleaning valve is further installed on the end side of the corner of the air outlet pipe.

[0010] In order to make the air flow rate more balanced, the exchange of hot and cold gases more complete, and the gas content in the furnace more uniform, the air inlets are further distributed in a grid shape.

[0011] In order to use the exhaust hot air to preheat the intake air, reduce energy consumption, and further reduce the temperature difference between the intake air temperature and the temperature inside the kiln body, the kiln further includes a heat exchange box, the outlet pipe is connected to the bottom end of the heat exchange box, the fan is installed on the top of the heat exchange box, and the intake pipe passes through the interior of the heat exchange box. The intake pipe is arranged in a corrugated shape inside the heat exchange box.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model is provided with a preheating chamber, which can use the temperature inside the kiln body to preheat the intake air, thereby reducing the temperature difference between the intake air temperature and the temperature inside the kiln body, thereby avoiding product cracking;

[0014] 2. The utility model sets the air inlet at the top of the kiln body and the air outlet at the bottom of the kiln body. When exchanging air, the relative temperature of the gas in the kiln body is cold at the top and hot at the bottom, which is more conducive to rapid exchange of gas.

[0015] 3. The utility model adopts the method of exhausting air from the bottom, which can effectively prevent dust from rising inside the kiln body, thereby avoiding contamination of the burned products and improving the product yield;

[0016] 4. The air inlet end of the air inlet pipe of the utility model is also provided with a high-pressure nitrogen connection end, which can be flushed with an appropriate amount of nitrogen for protection in the high temperature section and cooling stage;

[0017] 5. A cleaning valve is installed at the corner of the outlet pipe of the utility model to facilitate cleaning of the outlet pipe;

[0018] 6. The air inlet of the utility model is distributed in a grid shape. Compared with the existing single-hole air inlet and outlet, the air flow rate is more balanced, the exchange of hot and cold gases is more sufficient, and the gas content in the furnace is more uniform;

[0019] 7. The utility model also includes a heat exchange box. The air outlet pipe is connected to the bottom end of the heat exchange box. The fan is installed on the top of the heat exchange box. The air inlet pipe passes through the interior of the heat exchange box. The air inlet pipe is arranged in a wave shape inside the heat exchange box. The exhaust hot air can be used to preheat the intake air, reduce energy consumption, and further reduce the temperature difference between the intake air temperature and the temperature inside the kiln body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 Schematic diagram of the distribution structure of the air inlet of the utility model;

[0022] In the figure: 1. Kiln body; 2. Insulation bricks; 3. Air inlet; 4. Air inlet control valve; 5. Preheating chamber; 6. Air inlet pipe; 7. Fan; 8. Heat exchange box; 9. Compressed air connection end; 10. High-pressure nitrogen connection end; 11. Air outlet control valve; 12. Air outlet pipe; 13. Cleaning valve. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] See also Figure 1-2 The utility model provides the following technical solutions: a high-efficiency and energy-saving bell-type atmosphere sintering furnace, comprising a kiln body 1, the interior of the kiln body 1 is paved with insulation bricks 2, the top of the interior of the kiln body 1 is provided with a plurality of preheating cavities 5 located in the insulation bricks 2, the bottom of the preheating cavity 5 is provided with an air inlet 3 connected to the inner cavity of the kiln body 1, the upper end of the kiln body 1 is connected with an air inlet pipe 6 connected to the preheating cavity 5, the air inlet end of the air inlet pipe 6 is provided with a compressed air connection end 9, the bottom of the kiln body 1 is provided with an air outlet pipe 12 connected to the interior of the kiln body 1, and the air outlet end of the air outlet pipe 12 is connected to a fan 7.

[0026] By adopting the above technical solution, the utility model is provided with a preheating chamber 5, which can use the temperature inside the kiln body 1 to preheat the intake air, thereby reducing the temperature difference between the intake air temperature and the temperature inside the kiln body 1, thereby avoiding product cracking; the utility model arranges the air inlet at the top of the kiln body 1 and the air outlet at the bottom of the kiln body 1. During ventilation, the relative temperature of the gas in the kiln body 1 is cold at the top and hot at the bottom, which is more conducive to rapid gas exchange; the utility model adopts a bottom air outlet method, which can effectively avoid dust from being raised in the kiln body 1, thereby avoiding contamination of the burned product (such as the generation of abnormal crystallization) and improving the product yield.

[0027] Specifically, the air inlet pipe 6, the compressed air connection end 9 and the high-pressure nitrogen connection end 10 are all equipped with an air inlet control valve 4, and the air outlet control valve 11 is installed on the air outlet pipe 12. The air inlet control valve 4 and the air outlet control valve 11 are preferably solenoid valves.

[0028] The above technical solution is used to control the inlet and outlet of air.

[0029] Example 2

[0030] The difference between this embodiment and embodiment 1 is that: specifically, a high-pressure nitrogen connection end 10 is further provided on the intake end of the intake pipe 6 .

[0031] By adopting the above technical solution, an appropriate amount of nitrogen can be injected into the high temperature section and the cooling stage for protection.

[0032] Example 3

[0033] The difference between this embodiment and the first embodiment is that a cleaning valve 13 is installed at the end side of the corner of the air outlet pipe 12 .

[0034] By adopting the above technical solution, it is convenient to clean the air outlet pipe 12.

[0035] Example 4

[0036] The difference between this embodiment and embodiment 1 is that: specifically, the air inlets 3 are distributed in a grid shape.

[0037] By adopting the above technical solution, compared with the existing single-hole air inlet and outlet, the air flow rate is more balanced, the exchange of cold and hot gases is more sufficient, and the gas content in the furnace is more uniform.

[0038] Example 5

[0039] The difference between this embodiment and Example 1 is that: specifically, it also includes a heat exchange box 8, the air outlet pipe 12 is connected to the bottom end of the heat exchange box 8, the fan 7 is installed on the top of the heat exchange box 8, and the air inlet pipe 6 passes through the interior of the heat exchange box 8. The air inlet pipe 6 is arranged in a wave shape inside the heat exchange box 8.

[0040] By adopting the above technical solution, the exhaust hot air can be used to preheat the intake air, reducing energy consumption and further reducing the temperature difference between the intake air temperature and the temperature inside the kiln body 1.

[0041] In summary, the present invention is provided with a preheating chamber 5, which can use the temperature inside the kiln body 1 to preheat the intake air, thereby reducing the temperature difference between the intake air temperature and the temperature inside the kiln body 1, thereby avoiding product cracking; the present invention sets the air inlet at the top of the kiln body 1 and the air outlet at the bottom of the kiln body 1. During ventilation, the relative temperature of the gas in the kiln body 1 is cold at the top and hot at the bottom, which is more conducive to rapid exchange of gas; the present invention adopts the method of exhausting air from the bottom, which can effectively avoid dust from flying in the kiln body 1, thereby avoiding contamination of the burned products and improving the yield of the products; the air inlet end of the air inlet pipe 6 of the present invention is also provided with a high-pressure nitrogen connection end 10, which can be used in the high temperature section and the cooling section An appropriate amount of nitrogen is injected in the stage for protection; a cleaning valve 13 is installed on the end side of the corner of the air outlet pipe 12 of the utility model, which is convenient for cleaning the air outlet pipe 12; the air inlet 3 of the utility model is distributed in a grid shape, and compared with the existing single-hole air inlet and outlet, the air flow rate is more balanced, the exchange of hot and cold gases is more sufficient, and the gas content in the furnace is more uniform; the utility model also includes a heat exchange box 8, the air outlet pipe 12 is connected to the bottom end of the heat exchange box 8, the fan 7 is installed on the top of the heat exchange box 8, and the air inlet pipe 6 passes through the interior of the heat exchange box 8. The air inlet pipe 6 is arranged in a corrugated shape inside the heat exchange box 8, which can use the exhausted hot air to preheat the intake air, reduce energy consumption, and further reduce the temperature difference between the intake air temperature and the temperature inside the kiln body 1.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency and energy-saving bell-type atmosphere sintering furnace, characterized by: The kiln body comprises a kiln body, the interior of the kiln body is paved with insulating bricks, the top of the interior of the kiln body is provided with a plurality of preheating cavities located in the insulating bricks, the bottom of the preheating cavity is provided with an air inlet connected to the inner cavity of the kiln body, the upper end of the kiln body is connected with an air inlet pipe connected to the preheating cavity, the air inlet end of the air inlet pipe is provided with a compressed air connection end, the bottom of the kiln body is provided with an air outlet pipe connected to the interior of the kiln body, and the air outlet end of the air outlet pipe is connected to a fan.

2. The high-efficiency and energy-saving bell-type atmosphere sintering furnace according to claim 1, characterized in that: A high-pressure nitrogen connection end is also provided on the air inlet end of the air inlet pipe.

3. The high-efficiency and energy-saving bell-type atmosphere sintering furnace according to claim 2, characterized in that: The air intake pipe, the compressed air connection end and the high-pressure nitrogen connection end are all equipped with an air intake control valve.

4. The high-efficiency and energy-saving bell-type atmosphere sintering furnace according to claim 1, characterized in that: An air outlet control valve is installed on the air outlet pipe.

5. The high-efficiency and energy-saving bell-type atmosphere sintering furnace according to claim 1, characterized in that: A cleaning valve is installed at the end side of the outlet pipe corner.

6. The high-efficiency and energy-saving bell-type atmosphere sintering furnace according to claim 1, characterized in that: The air inlets are distributed in a grid shape.

7. The high-efficiency and energy-saving bell-type atmosphere sintering furnace according to claim 1, characterized in that: It also includes a heat exchange box, an air outlet pipe is connected to the bottom end of the heat exchange box, a fan is installed on the top of the heat exchange box, and an air inlet pipe passes through the interior of the heat exchange box.

8. The high-efficiency and energy-saving bell-type atmosphere sintering furnace according to claim 7, characterized in that: The air inlet pipe is arranged in a wave-like shape inside the heat exchange box.

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