Kiln atmosphere internal circulation and external circulation structure

Abstract

The utility model discloses a kiln atmosphere internal circulation and external circulation structure which comprises a kiln body, an air inducing opening is formed in the top of the kiln body, an external exhaust fan is arranged at the top of the kiln body, a collecting pipe is fixedly connected to the air exhaust end of the external exhaust fan, and an external exhaust valve is fixedly connected to the middle of the collecting pipe. The end of the collecting pipe is fixedly connected with a backflow pipe, and the bottom of the collecting pipe is correspondingly communicated with a first filter. The external exhaust fan, the first filter, the water-cooling condenser, the second filter and the oxygen analyzer are matched with one another, no air is introduced in the internal circulation process, the risk of oxygen pollution can be reduced, high-temperature waste gas enters the kiln again, the heating consumption of the kiln can be reduced, the loss of heat energy is reduced, and the service life of the kiln is prolonged. Meanwhile, gas emission is reduced, pollution to the environment is reduced, waste gas is recycled, the consumption of oxygen in the production process can be reduced, and therefore the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of kiln ventilation technology, specifically a kiln atmosphere internal and external circulation structure. Background Technology

[0002] A kiln is a piece of equipment made of refractory materials, mainly used for firing ceramics, sculptures, or fusing enamel onto the surface of metal objects. It is an essential facility in the forming of pottery, enabling physical and chemical reactions to occur under certain temperature and flame conditions, allowing the ceramic body and glaze to fuse into a finished product, and forming its color and variations.

[0003] Most existing kiln designs employ a direct exhaust system, resulting in exhaust gas with an oxygen content as high as 98%, leading to a significant waste of oxygen. Furthermore, the exhaust gas temperature, at 200-300 degrees Celsius, is also wasted due to thermal energy, which cannot be reused.

[0004] Therefore, we propose to design a kiln atmosphere internal and external circulation structure. Utility Model Content

[0005] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0006] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0007] A kiln atmosphere internal and external circulation structure includes a kiln body, an air inlet at the top of the kiln body, an exhaust fan at the top of the kiln body, a manifold fixedly connected to the exhaust end of the exhaust fan, an exhaust valve fixedly connected to the middle of the manifold, a return pipe fixedly connected to the end of the manifold, a first filter correspondingly connected to the bottom of the manifold, a water-cooled condenser externally connected to the first filter, an internal circulation exhaust fan connected to the end of the water-cooled condenser away from the first filter, a second filter correspondingly connected to the exhaust end of the internal circulation exhaust fan, an air supply pipe fixedly connected to the exhaust end of the second filter, an oxygen analyzer body correspondingly connected to the air supply pipe, an oxygen pipe fixedly connected to one end of the air supply pipe, and a float flow meter fixedly connected to both the air supply pipe and the kiln body.

[0008] As a preferred embodiment of the internal and external circulation structure of the kiln atmosphere described in this utility model, the return pipe is connected to the exhaust port of the secondary kiln, and the high-temperature waste gas can be returned to the kiln, thereby reducing the heating consumption of the kiln and reducing the loss of heat energy.

[0009] As a preferred embodiment of the internal and external circulation structure of the kiln atmosphere described in this utility model, two first filters are provided, and the filter elements of the two first filters are stainless steel sintered filter screens. The filtration accuracy of the first filters is 1μm, which is convenient for filtering dust in the exhaust gas.

[0010] As a preferred embodiment of the internal and external circulation structure of the kiln atmosphere described in this utility model, two second filters are provided, and the filter elements of the two second filters are polytetrafluoroethylene filter elements. The filtration accuracy of the second filters is 0.01μm, which further filters the return gas, improves the gas purity and reduces impurities.

[0011] As a preferred embodiment of the internal and external circulation structure of the kiln atmosphere described in this utility model, the exhaust end of the first filter is connected to the air inlet of the water-cooled condenser, the exhaust end of the internal circulation fan is connected to the exhaust port of the water-cooled condenser, and the exhaust end of the internal circulation fan is connected to the air inlet of the second filter. By cooling and removing dust from the exhaust gas, it is then reintroduced into the kiln, which helps to reduce oxygen consumption during the production process and thus reduce production costs.

[0012] As a preferred embodiment of the internal and external circulation structure of the kiln atmosphere described in this utility model, the bottom of the kiln body is provided with several oxygen inlets, each of which is connected to a gas supply pipe. Each of the oxygen inlets is equipped with a float flow meter at its bottom. The float flow meter is designed to withstand high temperatures and can accurately adjust the oxygen flow rate within 300°C to meet process requirements.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention utilizes the coordinated operation of an external exhaust fan, a first filter, a water-cooled condenser, a second filter, and an oxygen analyzer. During the internal circulation process, no air is introduced, reducing the risk of oxygen pollution. Furthermore, the re-entry of high-temperature exhaust gas into the kiln reduces kiln heating consumption and heat loss, while also minimizing gas emissions and environmental pollution. The recycling of exhaust gas further reduces oxygen consumption during production, thereby lowering production costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. 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. Among them:

[0016] Figure 1 This is a schematic diagram of the internal and external circulation structure of a kiln atmosphere according to the present invention.

[0017] Legend: 1. Kiln body; 2. Air inlet; 3. Exhaust fan; 4. Manifold; 5. Exhaust valve; 6. Return pipe; 7. First filter; 8. Water-cooled condenser; 9. Internal circulation fan; 10. Second filter; 11. Air supply pipe; 12. Oxygen analyzer body; 13. Oxygen pipe; 14. Float flow meter. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0021] Please see Figure 1 This utility model provides a kiln atmosphere internal and external circulation structure, including a kiln body 1, an air inlet 2 at the top of the kiln body 1, an external exhaust fan 3 at the top of the kiln body 1, a manifold 4 fixedly connected to the exhaust end of the external exhaust fan 3, an external exhaust valve 5 fixedly connected to the middle of the manifold 4, and a return pipe 6 fixedly connected to the end of the manifold 4.

[0022] The return pipe 6 is connected to the exhaust port of the secondary kiln, allowing the high-temperature exhaust gas to flow back into the kiln, thereby reducing the kiln's heating consumption and minimizing heat loss.

[0023] The bottom of the manifold 4 is connected to the first filter 7. A water-cooled condenser 8 is installed outside the first filter 7. An internal circulation fan 9 is installed at the end of the water-cooled condenser 8 away from the first filter 7. The exhaust end of the internal circulation fan 9 is connected to the second filter 10.

[0024] In this embodiment, there are two first filters 7, and the filter elements of both first filters 7 are stainless steel sintered filter screens. The filtration accuracy of the first filters 7 is 1μm, which is convenient for filtering dust in the exhaust gas.

[0025] In this embodiment, two second filters 10 are provided, and the filter elements of the two second filters 10 are polytetrafluoroethylene filter elements. The filtration accuracy of the second filters 10 is 0.01μm, which further filters the return gas, improves the gas purity and reduces impurities.

[0026] The exhaust end of the first filter 7 is connected to the air inlet of the water-cooled condenser 8, the exhaust end of the internal circulation fan 9 is connected to the exhaust port of the water-cooled condenser 8, and the exhaust end of the internal circulation fan 9 is connected to the air inlet of the second filter 10. By cooling and removing dust from the exhaust gas, it is then reintroduced into the kiln, which helps to reduce the oxygen consumption during the production process and thus reduce production costs.

[0027] The exhaust end of the second filter 10 is fixedly connected to an air supply pipe 11. An oxygen analyzer body 12 corresponding to the air supply pipe 11 is installed outside the air supply pipe 11. An oxygen pipe 13 is fixedly connected to one end of the air supply pipe 11. A float flow meter 14 is fixedly connected between the air supply pipe 11 and the kiln body 1.

[0028] In this embodiment, the bottom of the kiln body 1 is provided with several oxygen inlets, each of which is connected to the gas supply pipe 11. Each of the oxygen inlets is equipped with a float flow meter 14 at its bottom. The float flow meter 14 is designed to withstand high temperatures and can accurately adjust the oxygen flow rate within 300°C to meet the process requirements.

[0029] External circulation exhaust: Under normal oxygen supply conditions, open the external exhaust valve 5, close the internal circulation valve on the first filter 7 pipeline, open the external exhaust air outlet 2, and turn on the external exhaust fan 3. At this time, the external circulation system starts.

[0030] Internal circulation ventilation: First, close the external circulation exhaust system, close the external exhaust valve 5, and open the internal circulation valve on the first filter 7 pipeline.

[0031] Before starting the internal circulation exhaust fan 9, the oxygen in the system needs to be exhausted. Then, open the pure oxygen inlet valve on the oxygen pipe 13. The main body of the oxygen analyzer 12 is installed on the pipe to detect the oxygen concentration in real time. When the main body of the oxygen analyzer 12 detects that the oxygen concentration in the pipe is greater than 98%, close the pure oxygen inlet valve.

[0032] When the internal circulation exhaust fan 9 is turned on, the gas in the kiln passes through the first filter 7 to filter out the dust, then passes through the water-cooled condenser 8 for cooling, and then passes through the second filter 10 before re-entering the kiln.

[0033] Oxygen inlets are provided in each temperature zone at the bottom of the kiln body 1. Before entering the kiln, the oxygen passes through a float flow meter 14. The float flow meter 14 is designed to withstand high temperatures and can accurately adjust the oxygen flow rate within 300 degrees Celsius to meet the process requirements.

[0034] The external circulation system and the internal circulation system can be switched at any time. The entire process adopts a high-temperature resistant design. When the internal circulation system cannot meet the process requirements, the external circulation system can be turned on, and the internal circulation system can be turned on again after the oxygen concentration stabilizes.

[0035] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A kiln atmosphere internal and external circulation structure, comprising a kiln body (1), characterized in that, The kiln body (1) is provided with an air inlet (2) at the top, and an exhaust fan (3) is provided at the top of the kiln body (1). The exhaust fan (3) is fixedly connected to a manifold (4) at its exhaust end. An exhaust valve (5) is fixedly connected to the middle of the manifold (4). A return pipe (6) is fixedly connected to the end of the manifold (4). A first filter (7) is connected to the bottom of the manifold (4). A water-cooled condenser (8) is provided outside the first filter (7). The water-cooled condenser (8) is far from the... An internal circulation exhaust fan (9) is provided at one end away from the first filter (7). The exhaust end of the internal circulation exhaust fan (9) is connected to the second filter (10). The exhaust end of the second filter (10) is fixedly connected to an air supply pipe (11). An oxygen analyzer body (12) corresponding to it is provided outside the air supply pipe (11). An oxygen pipe (13) is fixedly connected at one end of the air supply pipe (11). A float flow meter (14) is fixedly connected between the air supply pipe (11) and the kiln body (1).

2. The kiln atmosphere internal and external circulation structure according to claim 1, characterized in that, The return pipe (6) is connected to the exhaust port of the second firing kiln.

3. The kiln atmosphere internal and external circulation structure according to claim 1, characterized in that, There are two first filters (7), and the filter elements of the two first filters (7) are stainless steel sintered filter screens. The filtration accuracy of the first filter (7) is 1μ.

4. The kiln atmosphere internal and external circulation structure according to claim 1, characterized in that, There are two second filters (10), and the filter elements of the two second filters (10) are tetrafluoroethylene filter elements. The filtration accuracy of the second filters (10) is 0.01μ.

5. The kiln atmosphere internal and external circulation structure according to claim 1, characterized in that, The exhaust end of the first filter (7) is connected to the air inlet of the water-cooled condenser (8), the exhaust end of the internal circulation fan (9) is connected to the exhaust port of the water-cooled condenser (8), and the exhaust end of the internal circulation fan (9) is connected to the air inlet of the second filter (10).

6. The kiln atmosphere internal and external circulation structure according to claim 1, characterized in that, The kiln body (1) has several oxygen inlets at the bottom, and each oxygen inlet is connected to a gas supply pipe (11). Each oxygen inlet is equipped with a float flow meter (14) at the bottom.

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