Hot blast stove capable of cleaning flue gas

Abstract

The utility model relates to a clean flue gas hot blast stove applied to the field of hot blast stoves, which comprises a stove body, a front arch and a rear arch are fixedly connected with an inner cavity of the stove body, a fire grate combustion area is formed among the lower end of the front arch, the lower end of the rear arch and the inner bottom wall of the stove body, and a secondary combustion chamber is formed between the front arch and the rear arch. A dust filtering chamber is formed between the rear arch and the right inner wall of the furnace body, the left end of the front arch is fixedly connected with a fuel hopper, a fire grate main body is arranged in the fire grate combustion area, and the lower end of the furnace body is sequentially and fixedly connected with an ash outlet hopper, a blast chamber and an ash hopper from left to right. According to the utility model, the flue gas is subjected to secondary heating so as to be fully combusted, and then the combusted flue gas is subjected to dust filtering treatment, so that dust in the flue gas is effectively prevented from being adhered to the heat exchange surface, and the conditions of efficiency reduction and energy waste of heat utilization equipment caused by adhesion of the dust to the heat exchange surface are effectively avoided.

Description

Technical Field

[0001] This utility model relates to a hot air furnace, and more particularly to a clean flue gas hot air furnace applied in the field of hot air furnaces. Background Technology

[0002] Hot air furnaces are thermal power machinery that have become a replacement for electric heat sources and traditional steam power sources in many industries. There are many types and series of hot air furnaces, which are divided into hand-fired and machine-fired types according to the coal feeding method, and into coal, oil, and gas furnaces according to the type of fuel.

[0003] The specification of Chinese Patent Publication No. CN222103923U discloses a new type of multi-purpose hot air stove. Compared with hot air stoves that can only use a single fuel, this utility model can use multiple types of fuel by installing a burner, hopper, and feeding port. It has a wide range of fuel sources, stable temperature control, simple operation, and convenient maintenance.

[0004] However, the above-mentioned patents still have the following problems in actual application: During the combustion process of the hot air furnace, the flue gas produced contains dust. When the hot air is used, the dust adheres to the heat exchange surface, causing a decrease in the thermal efficiency of the heat-using equipment and a large amount of energy waste. Moreover, it is difficult to clean the dust afterward, which brings inconvenience to the use of the hot air furnace. Utility Model Content

[0005] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that the flue gas produced by the hot blast stove during the combustion process contains dust, which will stick to the heat exchange surface, causing a decrease in the efficiency of the heat-using equipment and energy waste. Moreover, it is difficult to clean the dust on the heat exchange surface afterward, which brings inconvenience to the use of the hot blast stove.

[0006] To address the aforementioned problems, this utility model provides a clean flue gas hot air furnace, comprising a furnace body. A front arch and a rear arch are fixedly connected to the inner cavity of the furnace body. A grate combustion zone is formed between the lower ends of the front and rear arches and the inner bottom wall of the furnace body. A secondary combustion chamber is formed between the front and rear arches. A dust filtration chamber is formed between the rear arch and the right inner wall of the furnace body. A fuel hopper is fixedly connected to the left end of the front arch. A grate body is located within the grate combustion zone. From left to right, an ash hopper, a blower chamber, and an ash hopper are fixedly connected to the lower end of the furnace body. The ash hopper, blower chamber, and ash hopper are all connected to the grate combustion zone. The front and rear arches are both fixedly connected through the grate. There are multiple secondary air distribution ducts. Multiple granular filter beds are fixedly connected to the right inner wall of the furnace body. A dust collection hopper is formed between the lower end of the rear arch and the right inner wall of the furnace body. The granular filter bed includes a filter bed body fixedly connected to the right inner wall of the furnace body. Granular filter media is installed inside the filter bed body. An escape-proof net is fixedly connected to the left end of the filter bed body. A backflush gas pipe is provided at the right end of the furnace body. Multiple collection pipes corresponding to multiple granular filter beds are fixedly connected to the left end of the backflush gas pipe. The left end of the collection pipe is fixedly connected through the furnace body and extends into the adjacent filter bed body. A switching valve is fixedly connected between the collection pipe and the backflush gas pipe.

[0007] In the aforementioned clean flue gas hot air furnace, the flue gas is reheated during the combustion process to ensure complete combustion. The flue gas is then filtered to remove dust, effectively preventing dust from adhering to the heat exchange surface. This effectively avoids the reduction in efficiency and energy waste of the heat-using equipment caused by dust adhering to the heat exchange surface.

[0008] As a further improvement of this application, the left end of the grate body is located above the ash hopper, and the right end of the grate body is located above the ash hopper. The fuel hopper is located above the grate body, and a one-way valve is installed at the lower end of the fuel hopper.

[0009] As a further improvement of this application, the dust collection hopper has a conical cross-section, and a tilting valve is fixedly installed at the lower end of the dust collection hopper.

[0010] As a further improvement of this application, the granular filter media includes fine heavy granular filter media and large light granular filter media located in the inner cavity of the filter bed body. The large light granular filter media is located above the fine heavy granular filter media. Both the fine heavy granular filter media and the large light granular filter media are high-temperature resistant filter media.

[0011] As another improvement of this application, the collection pipe is located below the fine heavy filter media, and the rear end of the furnace body is provided with multiple filter media replenishment pipes corresponding to multiple particle filter beds. The filter media replenishment pipes are fixedly inserted into the filter bed body and are located above the large light filter media.

[0012] As another improvement of this application, multiple guide vanes are fixedly connected in the secondary combustion chamber. The guide vanes are tilted to the upper right as a whole, and multiple secondary air distribution pipes and multiple guide vanes are distributed in an interlaced manner.

[0013] In summary, during practical application, when the hot blast stove is burning, the flue gas enters the secondary combustion chamber and is distributed through the secondary air distribution pipe, allowing the high-temperature flue gas to be fully combusted a second time. The high-temperature flue gas after combustion carries dust into the dust filtration chamber. The dust-laden gas passes through the anti-escape net and enters the filter bed body, where it is filtered by the granular filter media. The clean flue gas enters the heat-using equipment through the collection pipe, thus effectively avoiding the situation where the heat-using equipment experiences reduced efficiency and energy waste due to dust adhering to the heat exchange surface. This effectively achieves the function of dust removal in the flue gas furnace, resulting in high-temperature, clean, and environmentally friendly output hot air. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the furnace body structure according to the first embodiment of this application;

[0015] Figure 2 This is a cross-sectional view of the dust filter chamber structure according to the first embodiment of this application;

[0016] Figure 3 This is a schematic diagram of the particle filter bed structure according to the first embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the dust collection hopper structure according to the first embodiment of this application;

[0018] Figure 5 This is a cross-sectional view of the furnace body structure according to the second embodiment of this application.

[0019] Explanation of the labels in the diagram:

[0020] 1. Grate Combustion Zone, 11. Fuel Hopper, 12. Grate Body, 13. Blower Chamber, 14. Front Arch, 15. Rear Arch, 16. Ash Hopper, 17. Ash Discharge Hopper, 2. Secondary Combustion Chamber, 21. Secondary Air Distribution Pipe, 22. Baffle Plate, 3. Dust Filtration Chamber, 31. Granular Filter Bed, 311. Filter Bed Body, 312. Granular Filter Media, 313. Escape Prevention Net, 314. Collection Pipe, 315. Backflush Gas Pipe, 316. Switching Valve, 317. Filter Media Replenishment Pipe, 32. Dust Collection Hopper, 321. Tilting Valve. Detailed Implementation

[0021] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0022] First implementation method:

[0023] Figure 1The diagram shows a clean flue gas hot air furnace, comprising a furnace body. A front arch 14 and a rear arch 15 are fixedly connected to the inner cavity of the furnace body. A grate combustion zone 1 is formed between the lower ends of the front arch 14 and the rear arch 15 and the inner bottom wall of the furnace body. A secondary combustion chamber 2 is formed between the front arch 14 and the rear arch 15. A dust filtration chamber 3 is formed between the rear arch 15 and the right inner wall of the furnace body. The left end of the grate body 12 is located above the ash hopper 17, and the right end of the grate body 12 is located above the ash hopper 16. The heat from the ash slag is transferred to the combustion zone below the rear arch 15 via thermal radiation from the furnace arch, ensuring complete combustion. After combustion, the ash slag falls into the ash hopper 16. The fuel hopper 11 is located above the grate body 12, and a one-way valve is installed at its lower end. The fuel hopper 11 is fixedly connected to the left end of the front arch 14. The grate body 12 is located within the grate combustion zone 1. From left to right, the lower end of the furnace body is fixedly connected to the ash discharge hopper 17, the blast chamber 13, and the ash slag hopper 16. The blast chamber 13 is equipped with… Equipped with an air distribution valve, air is distributed through the valve. Fuel combustion produces hot flue gas, which rises and enters the secondary combustion chamber 2. The ash hopper 17, the blower chamber 13, and the ash hopper 16 are all connected to the grate combustion zone 1. Multiple secondary air distribution pipes 21 are fixedly connected through the front arch 14 and the rear arch 15. Air is distributed through the secondary air distribution pipes 21 to ensure complete secondary combustion of the high-temperature flue gas. The high-temperature flue gas produced after combustion carries dust into the dust filter chamber 3. Multiple particle filters are fixedly connected to the right inner wall of the furnace body. The lower end of the filter bed 31 and the rear arch 15 form a dust collection hopper 32 between the right inner wall of the furnace body. The cross-section of the dust collection hopper 32 is conical, and a flip valve 321 is fixedly installed at the lower end of the dust collection hopper 32. After the dust in the granular filter material 312 is back-blown, it falls into the dust filter chamber 3 and enters the dust collection hopper 32 under gravity settling. The flip valve 321 at the bottom of the dust collection hopper 32 is opened periodically, and the dust falls into the ash hopper 16 and is discharged from the hot blast stove through the ash output device.

[0024] Figure 2 , Figure 3 and Figure 4The particle filter bed 31 includes a filter bed body 311 fixedly connected to the inner right wall of the furnace body. Particle filter media 312 are installed inside the filter bed body 311. An escape-proof net 313 is fixedly connected to the left end of the filter bed body 311. The escape-proof net 313 effectively prevents the backflushing gas from blowing the particle filter media 312 out of the filter bed body 311. A backflushing gas pipe 315 is provided at the right end of the furnace body. Multiple collection pipes 314, each corresponding to a different particle filter bed 31, are fixedly connected to the left end of the backflushing gas pipe 315. Filtered gas passes through... The gas can be discharged from the furnace body through the collection pipe 314. The left end of the collection pipe 314 is fixedly inserted through the furnace body and extends into the adjacent filter bed body 311. A switching valve 316 is fixedly connected between the collection pipe 314 and the backflushing gas pipe 315. After the filter bed body 311 has been filtering for a period of time, the filtration resistance of the granular filter media 312 increases, and the filter bed body 311 needs to be backflushed. During the backflushing process, the switching valve 316 switches to backflushing the filter bed body 311 one by one. The backflushing gas enters the bottom of the filter bed body 311 from the backflushing gas pipe 315. Dust in the granular filter media 312 falls into the dust filtration chamber 3 after backflushing and settles into the dust collection hopper 32 under gravity. The granular filter media 312 includes fine heavy granular filter media and large light granular filter media located in the inner cavity of the filter bed body 311. The large light granular filter media is located above the fine heavy granular filter media. Both the fine heavy granular filter media and the large light granular filter media are high-temperature resistant filter media. The collection pipe 314 is located below the fine heavy granular filter media. The dust-laden gas enters the filter bed body 311 through the escape-proof net 313 and passes through the first layer of large granular filter media. Lightweight filter media filters out some dust, and then the remaining dust is removed by fine heavy granular filter media. The filtered flue gas is clean flue gas, which is transported to the heat-using equipment through the collection pipe 314. The rear end of the furnace body is provided with multiple filter media replenishment pipes 317, which correspond to multiple granular filter beds 31. The filter media replenishment pipes 317 are fixedly inserted into the filter bed body 311 and are located above the large lightweight filter media. Filter media can be replenished into the filter bed body 311 through the filter media replenishment pipes 317.

[0025] During operation, fuel is automatically fed through the fuel hopper 11 and falls onto the grate body 12. The grate body 12 carries the fuel into the grate combustion zone 1, where it is ignited by the high-temperature radiation of the front arch 14 before entering the grate combustion zone 1 for further combustion. The blower chamber 13 is equipped with an air distribution valve, which distributes air. The combustion of fuel produces hot flue gas, which rises and enters the secondary combustion chamber 2. The resulting ash and slag are carried by the rotation of the grate body 12 and enter below the rear arch 15. The heat from the ash and slag is then transferred to the combustion zone by the heat radiation of the furnace arch, ensuring complete combustion. After combustion, the ash and slag fall into the ash and slag hopper 16. The hot flue gas then enters the secondary combustion chamber 2 and is distributed through the secondary air distribution pipe 21, allowing for a second, more complete combustion of the high-temperature flue gas. The high-temperature flue gas, carrying dust, enters the dust filter chamber 3. The dust-laden gas passes through the escape-proof net 313 and enters the filter bed body 311. After passing through the first layer of large-particle lightweight filter material, dust is filtered out. Part of the dust is filtered through a fine granular filter media to remove the remaining dust. The filtered flue gas is clean and is transported to the heat-using equipment via the collection pipe 314. After the filter bed body 311 has been filtering for a period of time, the filtration resistance of the granular filter media 312 increases, requiring backflushing of the filter bed body 311. The backflushing process is switched by the switching valve 316 to backflush the filter bed body 311 one by one. The backflushing gas enters the bottom of the filter bed body 311 from the backflushing gas pipe 315. The dust in the granular filter media 312 falls into the dust filtration chamber 3 after backflushing and enters the dust collection hopper 32 under gravity settling. The lightweight filter media falls back into the filter bed body 311 after being blocked by the escape-proof net 313. After the backflushing is completed, the granular filter bed 31 restores its filtration capacity. The flip valve 321 at the bottom of the dust collection hopper 32 is opened periodically, and the dust falls into the ash hopper 16 and is discharged from the hot air furnace through the ash output device.

[0026] Second implementation method:

[0027] This embodiment adds a guide plate 22 to the first embodiment, while the rest remains the same as the first embodiment.

[0028] Figure 5 As shown: Multiple guide plates 22 are fixedly connected inside the secondary combustion chamber 2. The guide plates 22 are tilted to the upper right as a whole. Multiple secondary air distribution pipes 21 are interspersed with multiple guide plates 22.

[0029] Fuel combustion produces hot flue gas. When the hot flue gas rises into the secondary combustion chamber 2, it is blocked by multiple guide plates 22, which prolongs the residence time of the flue gas in the secondary combustion chamber 2. Through multiple secondary air distribution pipes 21, the high-temperature flue gas is fully combusted in the secondary combustion chamber, which promotes the complete combustion of unburned particles as much as possible.

[0030] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A clean flue gas hot air furnace, comprising a furnace body, characterized in that: The inner cavity of the furnace body is fixedly connected to a front arch (14) and a rear arch (15). A grate combustion zone (1) is formed between the lower end of the front arch (14), the lower end of the rear arch (15), and the inner bottom wall of the furnace body. A secondary combustion chamber (2) is formed between the front arch (14) and the rear arch (15). A dust filtration chamber (3) is formed between the rear arch (15) and the right inner wall of the furnace body. A fuel hopper (11) is fixedly connected to the left end of the front arch (14). A grate body (12) is provided in the grate combustion zone (1). A ash hopper (17), a blower chamber (13), and an ash hopper (16) are fixedly connected from left to right at the lower end of the furnace body. The ash hopper (17), the blower chamber (13), and the ash hopper (16) are all connected to the grate combustion zone (1). Multiple secondary air distribution pipes (21) are fixedly connected through the front arch (14) and the rear arch (15). Multiple particle filter beds (31) are fixedly connected to the right inner wall of the furnace body. A dust collection hopper (32) is formed between the lower end of the rear arch (15) and the right inner wall of the furnace body. The particle filter bed (31) includes a filter bed body (311) fixedly connected to the inner right wall of the furnace body. Particle filter media (312) is installed inside the filter bed body (311). An escape-proof net (313) is fixedly connected to the left end of the filter bed body (311). A backflush gas pipe (315) is provided at the right end of the furnace body. A plurality of collection pipes (314) corresponding to a plurality of particle filter beds (31) are fixedly connected to the left end of the backflush gas pipe (315). The left end of the collection pipe (314) is fixedly penetrated through the furnace body and extends into the adjacent filter bed body (311). A switching valve (316) is fixedly connected between the collection pipe (314) and the backflush gas pipe (315).

2. The clean flue gas hot air furnace according to claim 1, characterized in that: The left end of the grate body (12) is located above the ash hopper (17), and the right end of the grate body (12) is located above the ash hopper (16). The fuel hopper (11) is located above the grate body (12), and a one-way valve is installed at the lower end of the fuel hopper (11).

3. A clean flue gas hot air furnace according to claim 1, characterized in that: The dust collection hopper (32) has a conical cross-section, and a tilt valve (321) is fixedly installed at the lower end of the dust collection hopper (32).

4. A clean flue gas hot air furnace according to claim 1, characterized in that: The granular filter media (312) includes fine heavy granular filter media and large light granular filter media located in the inner cavity of the filter bed body (311). The large light granular filter media is located above the fine heavy granular filter media. Both the fine heavy granular filter media and the large light granular filter media are high-temperature resistant filter media.

5. A clean flue gas hot air furnace according to claim 4, characterized in that: The collection pipe (314) is located below the fine heavy filter media. The rear end of the furnace body is provided with multiple filter media replenishment pipes (317) that correspond to multiple particle filter beds (31). The filter media replenishment pipes (317) are fixedly inserted into the filter bed body (311) and are located above the large light filter media.

6. A clean flue gas hot air furnace according to claim 1, characterized in that: Multiple guide plates (22) are fixedly connected inside the secondary combustion chamber (2). The guide plates (22) are tilted to the upper right as a whole. Multiple secondary air distribution pipes (21) and multiple guide plates (22) are distributed in an alternating manner.

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