Kiln dust recovery device for decomposing kiln tail waste gas outside kiln
By designing a kiln ash recycling device that decomposes the kiln tail exhaust gas outside the kiln, and adopts a multi-stage filtration system and cleaning components, the problem of incomplete collection of kiln ash by bag dust collectors is solved, and efficient recycling of kiln ash and emissions of kiln tail exhaust gas are achieved.
Patent Information
- Application Number
- CN202421614227.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-09
AI Technical Summary
The existing bag dust collectors do not collect kiln ash thoroughly enough, resulting in the inadequate utilization of kiln ash resources.
A kiln ash recovery device for decomposing the kiln tail exhaust gas outside the kiln is designed, and a multi-stage filtration system is adopted, including the first filter bag and the second filter bag. The diameter of the filter hole is gradually reduced, and combined with the cleaning components of the blower pipe and the nozzle, the thorough filtration and collection of kiln ash in the kiln tail exhaust gas is achieved.
Through the multi-stage filtration system, the thorough filtration and collection of kiln ash in the kiln tail waste gas is achieved, the efficiency of kiln ash is improved, and the emission of kiln tail waste gas is ensured to meet the standards.
Smart Images
Figure CN223005348U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cement production, in particular to a kiln ash recovery device for the exhaust gas at the tail of a precalcining kiln. Background Technique
[0002] Cement kiln ash is the dry powder obtained by collecting the dust discharged from the tail of the kiln through a dust collection device when firing Portland cement clinker. These powders are grayish-yellow or grayish-brown, have strong water absorption, and are rich in key components such as calcium oxide, silicate, alumina, and iron oxide. With the progress of cement kiln technology, such as the emergence of dry rotary kilns, the generation and treatment methods of kiln ash have also been optimized. Kiln ash is not only used as supplementary fuel and raw materials in cement production to reduce production costs and tail gas emissions, but also developed into kiln ash potassium fertilizer due to its rich potassium content, providing a new fertilizer source for agricultural production. Currently, bag filters are usually used to collect kiln ash in the exhaust gas at the tail of the kiln, but the existing bag filters are not thorough enough in collecting kiln ash. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is that the existing bag filter is not thorough enough in collecting kiln ash.
[0004] To solve the above problems, the utility model provides a kiln ash recovery device for the exhaust gas at the tail of a precalcining kiln, which includes a box body. An air inlet pipe and an exhaust pipe are respectively arranged on both sides of the box body. A first baffle is arranged in the box body near the air inlet pipe, and the upper end of the first baffle is fixed to the box body. A second baffle is arranged in the box body near the exhaust pipe, and the lower end of the second baffle is fixed to the box body; a plurality of first filter bags are arranged between the first baffle and the second baffle, and a plurality of second filter bags are arranged between the second baffle and the box body. The pore diameter of the first filter bags is larger than that of the second filter bags; a first collection hopper and a second collection hopper are arranged at the bottom of the box body.
[0005] The kiln ash recovery device for the exhaust gas at the tail of a precalcining kiln provided by the utility model also has the following technical features:
[0006] The first collection hopper is arranged below the first baffle and the first filter bags, and the second collection hopper is arranged below the second filter bags. Valves are arranged on both the first collection hopper and the second collection hopper.
[0007] The lower ends of the first filter bags and the second filter bags are both closed, and the upper ends are both fixed to the box body.
[0008] It also includes a cleaning component, which includes a blow pipe and a spray head. Blow pipes are arranged in both the first filter bags and the second filter bags. One end of the blow pipe is communicated with an air storage tank, and the other end of the blow pipe is closed. A plurality of spray heads are circumferentially arranged at intervals on the blow pipe, and a plurality of spray heads are arranged at intervals in the length direction of the blow pipe. The spray heads are communicated with the blow pipe.
[0009] The nozzle is arranged to slope downward from the center to the edge of the air blowing pipe.
[0010] The air storage tank is fixed outside the box body and is used for storing high-pressure air.
[0011] The upper ends of multiple air blowing pipes in the first filter bag are all communicated with a first air guide pipe, the first air guide pipe is communicated with the air storage tank, and a first air valve is arranged on the first air guide pipe;
[0012] The upper ends of multiple air blowing pipes in the second filter bag are all communicated with a second air guide pipe, the second air guide pipe is communicated with the air storage tank, and a second air valve is arranged on the second air guide pipe.
[0013] Multiple legs are arranged on the box body.
[0014] The utility model has the following beneficial effects: The exhaust gas at the tail of the kiln enters the box body from the air inlet pipe and impacts on the first baffle, and the large particles in the exhaust gas fall into the first collection hopper; the exhaust gas flows from the bottom to the top of the first filter bag, and the larger particles in the exhaust gas adhere to the first filter bag; the exhaust gas flows from the top to the bottom of the second filter bag and then is discharged through the exhaust pipe, and the small particles in the exhaust gas adhere to the second filter bag, so as to realize thorough filtration and collection of the kiln dust in the exhaust gas at the tail of the kiln through multi-stage filtration. Description of the Drawings
[0015] Figure 1 is a partial cross-sectional view of the side view of the utility model;
[0016] Figure 2 is a partial cross-sectional view of the first perspective axonometric view of the utility model;
[0017] Figure 3 is the axonometric view of the second perspective of the utility model. Detailed Embodiment
[0018] The utility model will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.
[0019] Such as Figures 1 to 3As shown in the figure, the kiln dust recovery device for the exhaust gas at the kiln tail of the novel shaft kiln with precalciner includes a box body 10. An air inlet pipe 11 and an exhaust pipe 12 are respectively arranged on both sides of the box body 10. A first baffle 21 is arranged in the box body 10 near the air inlet pipe 11, and the upper end of the first baffle 21 is fixed to the box body 10. A second baffle 22 is arranged in the box body 10 near the exhaust pipe 12, and the lower end of the second baffle 22 is fixed to the box body 10. A plurality of first filter bags 23 are arranged between the first baffle 21 and the second baffle 22, and a plurality of second filter bags 24 are arranged between the second baffle 22 and the box body 10. The pore diameter of the first filter bags 23 is larger than that of the second filter bags 24. A first collection hopper 25 and a second collection hopper 26 are arranged at the bottom of the box body 10.
[0020] The exhaust gas at the kiln tail enters the box body 10 from the air inlet pipe 11 and impacts on the first baffle 21. The large particles in the exhaust gas fall into the first collection hopper 25. The exhaust gas flows from the bottom to the top of the first filter bags 23, and the larger particles in the exhaust gas adhere to the first filter bags 23. The exhaust gas flows from the top to the bottom of the second filter bags 24 and is then discharged through the exhaust pipe 12. The small particles in the exhaust gas adhere to the second filter bags 24, so as to realize thorough filtration and collection of the kiln dust in the exhaust gas at the kiln tail through multi-stage filtration, making the exhaust gas at the kiln tail meet the emission standards.
[0021] Among them, the structures of the first filter bags 23 and the second filter bags 24 are both cylindrical, and their circumferential surfaces have a corrugated structure to increase the adsorption area. The structure of the filter bags is the prior art and will not be elaborated here.
[0022] Among them, the upper end, the front end and the rear end of the first baffle 21 are all fixed to the box body 10, that is, its lower end is not fixed to the box body 10. The lower end, the front end and the rear end of the second baffle 22 are all fixed to the box body 10, that is, its upper end is not fixed to the box body 10, so as to form an S-shaped circuit in the box body 10, that is, the exhaust gas at the kiln tail flows along Figure 1 the direction of the arrow in the figure, so that the exhaust gas at the kiln tail passes through the first filter bags 23 and the second filter bags 24 in turn for adsorption and filtration.
[0023] Among them, the exhaust gas at the kiln tail will enter the interiors of the first filter bags 23 and the second filter bags 24, but only the kiln dust of different particles will be adsorbed and collected by the filter bags. In addition, while the larger particles of the kiln dust in the exhaust gas at the kiln tail are adsorbed by the first filter bags 23, the smaller particles of the kiln dust will also freely enter the first filter bags 23, but will be discharged from the first filter bags 23 again under the action of pressure and enter the circuit.
[0024] Among them, the air inlet pipe 11 is arranged at a position above the middle of the box body 10, and the exhaust pipe 12 is arranged at a position below the middle of the box body 10.
[0025] Preferably, the first collection hopper 25 is arranged below the first baffle 21 and the first filter bag 23, and the second collection hopper 26 is arranged below the second filter bag 24. Valves are provided on both the first collection hopper 25 and the second collection hopper 26 to enable the first collection hopper 25 to collect large particles falling along the first baffle 21 in the waste gas and larger particles adsorbed by the first filter bag 23, and the second collection hopper 26 to collect small particles collected by the second filter bag 24 in the waste gas, so as to separately collect the kiln dust of different diameters.
[0026] Among them, the valves on the first collection hopper 25 and the second collection hopper 26 are in a normally closed state, so that the waste gas at the kiln tail can flow along the set S-shaped circuit.
[0027] Among them, those skilled in the art can select and set filter bags with different filter hole diameters other than the first filter bag 23 and the second filter bag 24 according to actual applications, arrange them in sequence inside the box body 10, and correspondingly set baffle structures other than the first baffle 21 and the second baffle 22, so as to achieve multi-stage filtration of the waste gas at the kiln tail and further improve the filtration effect.
[0028] Preferably, the lower ends of the first filter bag 23 and the second filter bag 24 are both closed, and the upper ends are both fixed to the box body 10 to prevent the kiln dust in the waste gas at the kiln tail from entering the inside of the filter bag, that is, to ensure that the kiln dust adheres to the outer surface of the filter bag.
[0029] Among them, a support plate 27 is fixed at the top inside the box body 10, and both the first filter bag 23 and the second filter bag 24 are fixed on the support plate 27.
[0030] Preferably, it further includes a cleaning assembly 30. The cleaning assembly 30 includes a blowing pipe 31 and a nozzle 32. Blowing pipes 31 are arranged inside both the first filter bag 23 and the second filter bag 24. One end of the blowing pipe 31 is communicated with an air storage tank 33, and the other end of the blowing pipe 31 is closed. A plurality of nozzles 32 are circumferentially arranged at intervals on the blowing pipe 31, and a plurality of nozzles 32 are arranged at intervals in the length direction of the blowing pipe 31. The nozzles 32 are communicated with the blowing pipe 31.
[0031] Air is supplied to the blowing pipe 31 through the air storage tank 33 and is ejected through the nozzles 32 to regularly clean the kiln dust attached to the outside of the first filter bag 23 and the second filter bag 24. The cleaned kiln dust falls into the corresponding first collection hopper 25 or second collection hopper 26.
[0032] Among them, a pressure detection module can be set on the box body 10 to monitor the gas pressure inside the box body 10, so as to facilitate judging whether the filter bag needs to be cleaned.
[0033] Preferably, the spray head 32 is inclined downward from the center to the edge of the air blowing pipe 31, so that the spray head 32 sprays gas obliquely downward, and the kiln dust attached to the outside of the first filter bag 23 and the second filter bag 24 is sprayed downward obliquely.
[0034] Preferably, the air storage tank 33 is fixed outside the box body 10 and is used for storing high-pressure air.
[0035] Preferably, referring to Figure 2 , the upper ends of the plurality of air blowing pipes 31 in the first filter bag 23 are all communicated with the first air guide pipe 35, the first air guide pipe 35 is communicated with the air storage tank 33, and a first air valve 36 is arranged on the first air guide pipe 35;
[0036] The upper ends of the plurality of air blowing pipes 31 in the second filter bag 24 are all communicated with the second air guide pipe 37, the second air guide pipe 37 is communicated with the air storage tank 33, and a second air valve 38 is arranged on the second air guide pipe 37, so as to realize the separate control of the cleaning process of the kiln dust attached to the first filter bag 23 and the second filter bag 24.
[0037] Preferably, a plurality of legs 13 are arranged on the box body 10.
[0038] The working principle of the present utility model is as follows:
[0039] The waste gas at the kiln tail enters the box body 10 from the air inlet pipe 11 and impacts on the first baffle 21, and the large-particle kiln dust in the waste gas falls into the first collection hopper 25; the waste gas flows between the first baffle 21 and the second baffle 22 and flows from the bottom to the top of the first filter bag 23, and the larger-particle kiln dust in the waste gas adheres to the first filter bag 23; the waste gas flows between the second baffle 22 and the box body 10 and flows from the top to the bottom of the second filter bag 24, and then is discharged from the exhaust pipe 12, and the small particles in the waste gas adhere to the second filter bag 24; so as to realize the thorough filtration and collection of the kiln dust in the waste gas at the kiln tail through multi-stage filtration.
[0040] Open the first air valve 36 and the second air valve 38, so that the air storage tank 33 supplies air to the air blowing pipes 31 in the first filter bag 24 and the second filter bag 24 respectively, and sprays air obliquely downward through the spray head 32, and sprays the kiln dust attached to the outside of the first filter bag 23 and the second filter bag 24 downward obliquely, so as to regularly clean the kiln dust attached to the outside of the first filter bag 23 and the second filter bag 24, and the cleaned kiln dust falls into the corresponding first collection hopper 25 or second collection hopper 26; that is, the first collection hopper 25 collects the large particles falling along the first baffle 21 in the waste gas and the larger particles adsorbed by the first filter bag 23, and the second collection hopper 26 collects the small particles collected by the second filter bag 24 in the waste gas, so as to realize the separate collection of the kiln dust with different diameters.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A kiln dust recovery device for decomposing kiln tail exhaust gas outside the kiln, comprising a box body (10), wherein an air inlet pipe (11) and an exhaust pipe (12) are respectively arranged on both sides of the box body (10), characterized in that: A first baffle (21) is provided in the box body (10) near the air inlet pipe (11), the upper end of the first baffle (21) is fixed to the box body (10), a second baffle (22) is provided in the box body (10) near the air outlet pipe (12), the lower end of the second baffle (22) is fixed to the box body (10); a plurality of first filter bags (23) are provided between the first baffle (21) and the second baffle (22), a plurality of second filter bags (24) are provided between the second baffle (22) and the box body (10), the filter hole diameter of the first filter bag (23) is larger than the filter hole diameter of the second filter bag (24); and a first collecting bucket (25) and a second collecting bucket (26) are provided at the bottom of the box body (10).
2. The kiln dust recovery device for the kiln tail exhaust gas of the kiln outside the kiln according to claim 1 is characterized in that: The first collecting hopper (25) is arranged below the first baffle (21) and the first filter bag (23), and the second collecting hopper (26) is arranged below the second filter bag (24). Valves are provided on the first collecting hopper (25) and the second collecting hopper (26).
3. The kiln dust recovery device for the kiln tail exhaust gas of the kiln outside the kiln according to claim 1 is characterized in that: The lower ends of the first filter bag (23) and the second filter bag (24) are both sealed, and the upper ends are both fixed to the box body (10).
4. The kiln dust recovery device for the kiln tail exhaust gas of the kiln outside the kiln according to claim 1 is characterized in that: The cleaning assembly (30) further comprises an air blowing pipe (31) and a nozzle (32). The air blowing pipe (31) is provided in each of the first filter bag (23) and the second filter bag (24). One end of the air blowing pipe (31) is in communication with the air storage tank (33). The other end of the air blowing pipe (31) is closed. A plurality of nozzles (32) are provided at intervals in the circumferential direction of the air blowing pipe (31). A plurality of nozzles (32) are provided at intervals in the longitudinal direction of the air blowing pipe (31). The nozzles (32) are in communication with the air blowing pipe (31).
5. The kiln dust recovery device for the kiln tail exhaust gas of the kiln outside the kiln according to claim 4 is characterized in that: The nozzle (32) is arranged to be inclined downward from the center of the air blowing pipe (31) to the edge thereof.
6. The kiln dust recovery device for the kiln tail exhaust gas of the kiln outside the kiln according to claim 4 is characterized in that: The air storage tank (33) is fixed outside the box body (10) and is used to store high-pressure air.
7. The kiln dust recovery device for the kiln tail exhaust gas of the kiln outside the kiln according to claim 6 is characterized in that: The upper ends of the plurality of air blowing pipes (31) in the first filter bag (23) are all in communication with a first air guide pipe (35), the first air guide pipe (35) is in communication with an air storage tank (33), and a first air valve (36) is provided on the first air guide pipe (35); The upper ends of the plurality of air blowing pipes (31) in the second filter bag (24) are all in communication with the second air guide pipe (37), the second air guide pipe (37) is in communication with the air storage tank (33), and the second air guide pipe (37) is provided with a second air valve (38).
8. The kiln dust recovery device for the kiln tail exhaust gas of the kiln outside the kiln according to claim 1 is characterized in that: The box body (10) is provided with a plurality of supporting legs (13).