Lime kiln tail gas treatment device

Abstract

The invention relates to the technical field of waste gas treatment, and provides a lime kiln tail gas treatment device which comprises a shell, the shell is provided with a gas inlet and a gas outlet, the gas inlet is located in the top of the shell, and the gas outlet is located in the bottom of the shell; the separation box is arranged at the top of the shell and divides the shell into a first air cavity and a second air cavity, and the air inlet, the first air cavity, the second air cavity and the air outlet are sequentially communicated; the first nozzle is arranged in the shell and located in the second air cavity, the first nozzle is used for spraying water mist into the shell, and the water mist penetrates through the separation box and then enters the first air cavity. According to the technical scheme, the problem that the spray gun is easily blocked due to incomplete removal of solid powder in a traditional dust removal device in the related technology is solved.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to a lime kiln tail gas treatment device. Background Art

[0002] At present, gas furnaces are usually used in steel enterprises to produce lime and calcine limestone. During the calcination process, a large amount of tail gas will be generated, which is mainly composed of CO2 produced by the decomposition of limestone and flue gas generated by fuel combustion. Its main components include CO2 and N2, and also contain a small amount of CO, O2 and other impurities. The volume fraction of CO2 can reach 25-42%, and there is a large amount of solid dust. At the same time, in the process of steelmaking, converter gas recovery is also carried out for environmental protection and cost control. In the process of gas recovery, N2 is usually used as a carrier, and carbon is sprayed through a spray gun to make carbon react with CO2 and O2 in the flue gas to form CO. However, N2 entering the converter gas will reduce the CO content and calorific value in the gas, affecting the efficiency of gas recovery. Since the tail gas of the lime kiln contains a large amount of CO2 and N2, the tail gas of the lime kiln can be used to spray carbon. However, the tail gas of the lime kiln contains a large amount of solid dust. The tail gas of the lime kiln needs to be pretreated before entering the spray gun. Although the traditional dust removal and purification device can also remove the tail gas dust, it will produce a lot of smoke and dust during operation, and the solid powder in the tail gas will not be completely removed, which is easy to cause clogging of the spray gun. Summary of the invention

[0003] The present invention provides a lime kiln tail gas treatment device, which solves the problem in the related art that incomplete removal of solid powder in a traditional dust removal device easily causes clogging of a spray gun.

[0004] The technical solution of the present invention is as follows: A lime kiln tail gas treatment device, comprising: A housing, wherein the housing has an air inlet and an air outlet, wherein the air inlet is located at the top of the housing, and the air outlet is located at the bottom of the housing; A partition box, the partition box is arranged on the top of the shell, the partition box divides the shell into a first air cavity and a second air cavity, the air inlet, the first air cavity, the second air cavity and the air outlet are connected in sequence; A first nozzle is arranged in the shell and located in the second air cavity. The first nozzle is used to spray water mist into the shell. The water mist passes through the partition box and then enters the first air cavity.

[0005] Optionally, the partition box includes a plurality of partition plates, and the plurality of partition plates enclose the first air cavity. The partition box has a first opening at one end close to the air outlet and a second opening at an end away from the air outlet. The cross-sectional area of ​​the first opening is greater than the cross-sectional area of ​​the second opening. The first opening abuts against the side wall of the shell. The partition plate has a connecting air port at one end close to the air outlet, and the connecting air port connects the first air cavity and the second air cavity.

[0006] Optionally, the other end of the partition plate further has a connecting water port, and the water mist passes through the connecting water port and then enters the first air cavity.

[0007] Optionally, the shell has at least one side wall, the number of the partition plates is equal to the number of the side walls, and the first nozzles are distributed along the circumference of the shell side wall.

[0008] Optionally, the first nozzle comprises: a first protective plate, one end of which is disposed on the side wall; A second protective plate, one end of the second protective plate is arranged on the side wall, the other ends of the first protective plate and the second protective plate are close to each other to form a water outlet, and a protective space is formed between the first protective plate and the second protective plate; Atomizing nozzle, there are multiple atomizing nozzles, and the multiple atomizing nozzles are arranged in the protection space.

[0009] Optionally, the water outlet faces the connecting water outlet, and the height of the water outlet is lower than that of the second opening.

[0010] Optionally, a second nozzle is further included, which is arranged in the shell and below the first nozzle. The second nozzle has the same structure as the first nozzle, and the water mist sprayed from the second nozzle separates the second air cavity into an adsorption area and a clean area.

[0011] Optionally, the water outlet of the second nozzle is inclined downward.

[0012] Optionally, the housing has an outlet, the height of the outlet is lower than the height of the air outlet, and further comprises: A collecting cylinder, wherein the collecting cylinder has a water inlet, and the water inlet is connected to the outlet; A collecting bin, which is detachably disposed in the collecting cylinder; A diaphragm is arranged at the bottom of the collecting chamber and is used for allowing water molecules to pass through.

[0013] Optionally, it also includes: An extrusion piston is slidably disposed in the collecting tube. After sliding, the extrusion piston abuts against or cancels the abutment with the collecting bin, and an extrusion space is formed between the extrusion piston and the collecting bin.

[0014] The working principle and beneficial effects of the present invention are: In the present invention, in order to solve the problem that the traditional dust removal device in the related art is not completely removing solid powder and is easy to cause the spray gun to be blocked, the tail gas is subjected to dust removal treatment before entering the spray gun. During the dust removal process, the tail gas flows through the first air cavity and the second air cavity in sequence. The first nozzle can first spray water mist into the first air cavity and the second air cavity. After the water mist contacts the tail gas, it adsorbs the solid powder in the tail gas, thereby removing the dust in the tail gas. Due to the separation of the partition box, the path of the tail gas flow is extended, so that the tail gas and the water mist are fully contacted, the contact time of the tail gas and the water mist is increased, and the solid dust in the tail gas is adsorbed more completely. During the treatment process, the water mist itself can play a role in dust reduction. After the solid dust contacts the water mist, it becomes sewage and is temporarily stored at the bottom of the shell. It can be directly extracted later, and then the water and dust impurities in the sewage are separated, and the dust impurities can be centrally treated. The tail gas after adsorption treatment can be discharged from the outlet and then centrally pressurized, collected and used.

[0015] The working principle of the present invention is that the exhaust gas first enters the first air cavity from the air inlet, and the first nozzle continuously sprays fine water mist into the second air cavity and the first air cavity. The exhaust gas continuously contacts the water mist during the process of flowing through the first air cavity and the second air cavity. The water mist absorbs the solid dust in the exhaust gas to avoid clogging of the spray gun when the exhaust gas is recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the local structure of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 It is a schematic diagram of the structure of the partition box of the present invention.

[0018] In the figure: 1. shell, 11. air inlet, 12. air outlet, 2. partition box, 13. first air cavity, 14. second air cavity, 3. first nozzle, 21. partition plate, 22. first opening, 23. second opening, 211. connecting air port, 212. connecting water port, 15. side wall, 31. first protective plate, 32. second protective plate, 33. water outlet, 34. protective space, 4. second nozzle, 141. adsorption area, 142. clean area, 16. outlet, 5. collecting cylinder, 51. water inlet, 6. collecting bin, 7. diaphragm, 8. extrusion piston. DETAILED DESCRIPTION In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0019] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0020] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0022] Reference Figure 1~Figure 4, which is the first embodiment of the present invention, proposes a lime kiln exhaust gas treatment device, including a shell 1, the shell 1 has an air inlet 11 and an air outlet 12, the air inlet 11 is located at the top of the shell 1, and the air outlet 12 is located at the bottom of the shell 1; a partition box 2 is arranged at the top of the shell 1, and the partition box 2 divides the shell 1 into a first air cavity 13 and a second air cavity 14, and the air inlet 11, the first air cavity 13, the second air cavity 14 and the air outlet 12 are connected in sequence; a first nozzle 3 is arranged in the shell 1, located in the second air cavity 14, and the first nozzle 3 is used to spray water mist into the shell 1, and the water mist enters the first air cavity 13 after passing through the partition box 2.

[0023] In this embodiment, in order to solve the problem that the traditional dust removal device in the related art is not completely removing solid powder and is easy to cause the spray gun to be blocked, the exhaust gas is subjected to dust removal treatment before entering the spray gun. During the dust removal process, the exhaust gas flows through the first air cavity 13 and the second air cavity 14 in sequence. The first nozzle 3 can first spray water mist into the first air cavity 13 and the second air cavity 14. After the water mist contacts the exhaust gas, it absorbs the solid powder in the exhaust gas, thereby removing the dust in the exhaust gas. Due to the separation of the partition box 2, the path of the exhaust gas is extended, so that the exhaust gas and the water mist are fully in contact, and the contact time between the exhaust gas and the water mist is increased, so that the solid dust in the exhaust gas is more completely adsorbed. During the treatment process, the water mist itself can play a role in dust reduction. After the solid dust contacts the water mist, it becomes sewage and is temporarily stored at the bottom of the shell 1. It can be directly extracted later, and then the water and dust impurities in the sewage are separated, and the dust impurities can be centrally treated. The exhaust gas after adsorption treatment can be discharged from the air outlet 12 and then centrally pressurized for treatment, and collected for standby use.

[0024] Specifically, the exhaust gas first enters the first air cavity 13 from the air inlet 11, and the first nozzle 3 continuously sprays fine water mist into the second air cavity 14 and the first air cavity 13. The exhaust gas is continuously in contact with the water mist during the process of flowing through the first air cavity 13 and the second air cavity 14. The water mist absorbs the solid dust in the exhaust gas to avoid clogging of the spray gun when the exhaust gas is recycled.

[0025] Furthermore, the partition box 2 includes a plurality of partition plates 21, which enclose a first air cavity 13. The partition box 2 has a first opening 22 at one end close to the air outlet 12 and a second opening 23 at one end away from the air outlet 12. The cross-sectional area of ​​the first opening 22 is greater than the cross-sectional area of ​​the second opening 23. The first opening 22 abuts against the side wall of the shell 1. The partition plate 21 has a connecting air port 211 at one end close to the air outlet 12, and the connecting air port 211 connects the first air cavity 13 and the second air cavity 14.

[0026] In this embodiment, the partition box is composed of a plurality of partition plates, and the area of ​​the first opening 22 at the upper end of the partition box is larger than the area of ​​the second opening 23 at the lower end, so that in the first air cavity 13, after the exhaust gas and the water mist contact to form sewage, they are concentrated along the partition plate 21 to the second opening 23, and fall from the second opening 23 to the bottom of the shell 1. A connecting air port 211 is provided at the upper end of the partition plate 21, and an air intake pipe can be installed at the air intake port 11, and the position of the air intake pipe is closer to the second opening 23, so that after the first air cavity 13 is filled with exhaust gas, the exhaust gas rises along the partition plate 21 and enters the second air cavity 14 from the connecting air port 211, extending the flow path of the exhaust gas in the shell 1, thereby increasing the contact time between the water mist and the exhaust gas. Although some exhaust gas will directly enter the second air cavity 14 from the second opening 23, due to the small area of ​​the second opening 23, most of the exhaust gas can rise along the partition plate 21 and then enter the second air cavity 14 through the connecting air port 211.

[0027] Furthermore, the other end of the partition plate 21 also has a communicating water port 212 , and the water mist passes through the communicating water port 212 and enters the first air cavity 13 .

[0028] In this embodiment, in order to fill the first air cavity 13 with water mist, thereby increasing the chance of exhaust gas and water mist contacting each other, a connecting water port 212 is provided on the partition plate 21 for water mist to pass through, so that the exhaust gas can fully contact the water mist in both the first air cavity 13 and the second air cavity 14.

[0029] Furthermore, the shell 1 has at least one side wall 15 , the number of the partition plates 21 is equal to the number of the side walls 15 , and the first nozzles 3 are distributed along the circumference of the side wall 15 of the shell 1 .

[0030] In this embodiment, the number of the side walls 15 of the shell 1 is consistent with the number of the partition plates 21. When the shell 1 has only one side wall 15, it can be cylindrical, and the corresponding shape of the partition box 2 is conical. Or the cross section of the shell 1 is polygonal, and the number of polygons is greater than or equal to 3. Through the consistency of the number of the side walls 15 of the shell 1 and the number of the partition plates 21, it is convenient to arrange the first nozzle 3 in the shell 1, so that the sprayed water mist can evenly enter the first air cavity 13 without obstruction, so that the water mist is evenly distributed in the first air cavity 13 and the second air cavity 14, so that the exhaust gas can fully contact with the water mist, and the efficiency of solid dust adsorption is improved.

[0031] Furthermore, the first nozzle 3 includes: a first protective plate 31, one end of the first protective plate 31 is arranged on the side wall 15; one end of the second protective plate 32 is arranged on the side wall 15, the other ends of the first protective plate 31 and the second protective plate 32 are close to each other to form a water outlet 33, and a protective space 34 is formed between the first protective plate 31 and the second protective plate 32; there are multiple atomizing nozzles, and the multiple atomizing nozzles are arranged in the protective space 34.

[0032] In this embodiment, the first nozzle 3 is composed of a first protective plate 31, a second protective plate 32 and an atomizing nozzle. The first protective plate 31 and the second protective plate 32 protect the atomizing nozzle, so that the atomizing nozzle can be kept clean during operation to avoid clogging of the atomizing nozzle. Once the atomizing nozzle is clogged, the water mist cannot be evenly sprayed from the water outlet 33, which will affect the effect of the water mist on the adsorption of solid dust.

[0033] Furthermore, the water outlet faces the connecting water port 212 , and the height of the water outlet 33 is lower than that of the second opening 23 .

[0034] In this embodiment, the direction of the water outlet 33 is toward the connecting water port 212, so that the water mist sprayed from the first nozzle 3 can enter the first air cavity 13 through the connecting water port 212 after passing through the second air cavity 14, ensuring that the first air cavity 13 and the second air cavity 14 can be filled with water mist. Since the height of the water outlet 33 is lower than the second opening 23, the path for the water mist to be sprayed can be extended, and the bottom of the housing 1 can be filled with water mist as much as possible, and the exhaust gas can be in contact with the water mist throughout the entire flow path, thereby improving the ability of the water mist to absorb solid dust in the exhaust gas.

[0035] Furthermore, it also includes a second nozzle 4, which is arranged in the shell 1 and located below the first nozzle 3. The second nozzle 4 has the same structure as the first nozzle 3. The water mist sprayed from the second nozzle 4 divides the second air cavity 14 into an adsorption area 141 and a clean area 142.

[0036] In this embodiment, in order to further increase the water mist content in the second air cavity 14, a second nozzle 4 is also provided below the first nozzle 3, so that the bottom of the shell 1 can also be evenly filled with water mist, thereby improving the efficiency and quality of the exhaust gas dust removal treatment. By increasing the water mist content, the air intake at the air inlet 11 can be increased, thereby improving the efficiency of the exhaust gas dust removal treatment. The water mist sprayed from the second nozzle 4 can form an isolated water barrier when it is just sprayed out, and the water barriers sprayed from the second nozzles 4 on different side walls 15 can cross each other, so that the exhaust gas is in contact with the clean water mist in the last path discharged from the air outlet 12, and the dust can be continuously adsorbed. Even if there is continuous dripping of sewage, the second nozzle 4 can continue to spray clean water mist, thereby ensuring that the water mist still has adsorption capacity at the bottom of the shell 1.

[0037] Furthermore, the water outlet 33 of the second nozzle 4 is inclined downward.

[0038] In this embodiment, the water outlet 33 of the second nozzle 4 can be tilted downward, so that after increasing the spray volume of the atomizing nozzle, the bottom of the shell 1 can be flushed by water mist, and the shell 1 can be easily cleaned when exhaust gas treatment is not performed.

[0039] Furthermore, the shell 1 has an outlet 16, the height of the outlet 16 is lower than the height of the air outlet 12, and also includes a collecting tube 5, the collecting tube 5 has a water inlet 51, and the water inlet 51 is connected to the outlet 16; the collecting bin 6 is detachably arranged in the collecting bin 5; the diaphragm 7 is arranged at the bottom of the collecting bin 6, and the diaphragm 7 is used for water molecules to pass through.

[0040] In this embodiment, the sewage at the bottom of the housing 1 can enter the collecting cylinder 5 through the outlet 16, and finally enter the collecting bin 6. The bottom of the collecting bin 6 is provided with a diaphragm 7 that only allows water molecules to pass through, so that the water and sludge in the sewage can be separated in the collecting bin 6. After the collecting bin 6 has been collected for a period of time, the collecting bin 6 can be disassembled and replaced, or the sludge can be cleaned and then continued to be used.

[0041] Furthermore, it also includes an extrusion piston 8, which is slidably arranged in the collecting tube 5. After sliding, the extrusion piston 8 abuts against the collecting bin 6 or cancels the abutment, and an extrusion space is formed between the extrusion piston 8 and the collecting bin 6.

[0042] In this embodiment, during the process of collecting sewage in the collection bin 6, the sludge in the collection bin 6 can be squeezed by the piston to further separate the water and the sludge. When the collection bin 6 needs to be replaced, the squeezing piston 8 is located below the water inlet 51, and the squeezing piston 8 can be tightly abutted against the inner wall of the collection barrel 5. At this time, the sewage entering the collection barrel 5 through the water inlet 51 is temporarily located above the squeezing piston 8, and the exhaust gas treatment can be continuously performed when the collection bin 6 is replaced. After the new collection bin 6 is installed, the squeezing piston 8 moves up, so that the upper surface of the squeezing piston 8 is an inclined conical surface, and the minimum thickness of the squeezing piston 8 is less than the diameter of the water inlet 51, so that the sewage temporarily stored on the squeezing piston 8 can flow back to the water inlet 51 and then enter the collection bin 6. Thereby, the exhaust gas treatment can be continuously performed, and the efficiency of the exhaust gas treatment is improved.

[0043] 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A lime kiln tail gas treatment device, characterized in that: include: A shell (1), the shell (1) having an air inlet (11) and an air outlet (12), the air inlet (11) being located at the top of the shell (1), and the air outlet (12) being located at the bottom of the shell (1); a partition box (2), the partition box (2) being arranged on the top of the shell (1), the partition box (2) partitioning the shell (1) into a first air cavity (13) and a second air cavity (14), the air inlet (11), the first air cavity (13), the second air cavity (14) and the air outlet (12) being connected in sequence; A first nozzle (3), the first nozzle (3) being arranged in the shell (1) and located in the second air cavity (14), the first nozzle (3) being used to spray water mist into the shell (1), the water mist penetrating the partition box (2) and then entering the first air cavity (13).

2. A lime kiln tail gas treatment device according to claim 1, characterized in that: The partition box (2) comprises a plurality of partition plates (21), the plurality of partition plates (21) enclosing the first air cavity (13); the partition box (2) has a first opening (22) at one end close to the air outlet (12), and has a second opening (23) at one end away from the air outlet (12); the cross-sectional area of ​​the first opening (22) is greater than the cross-sectional area of ​​the second opening (23); the first opening (22) abuts against a side wall of the shell (1); the partition plate (21) has a connecting air port (211) at one end close to the air outlet (12), and the connecting air port (211) connects the first air cavity (13) and the second air cavity (14).

3. A lime kiln tail gas treatment device according to claim 2, characterized in that: The other end of the partition plate (21) further has a communicating water port (212), and the water mist passes through the communicating water port (212) and then enters the first air cavity (13).

4. A lime kiln tail gas treatment device according to claim 2, characterized in that: The shell (1) has at least one side wall (15), the number of the partition plates (21) is equal to the number of the side walls (15), and the first nozzles (3) are distributed along the circumference of the side wall (15) of the shell (1).

5. A lime kiln tail gas treatment device according to claim 4, characterized in that: The first nozzle (3) comprises: a first protective plate (31), wherein one end of the first protective plate (31) is arranged on the side wall (15); a second protective plate (32), one end of the second protective plate (32) being arranged on the side wall (15), the other ends of the first protective plate (31) and the second protective plate (32) being close to each other to form a water outlet (33), and a protective space (34) being formed between the first protective plate (31) and the second protective plate (32); Atomizing nozzles, wherein the atomizing nozzles are multiple and the multiple atomizing nozzles are arranged in the protection space (34).

6. A lime kiln tail gas treatment device according to claim 5, characterized in that: The water outlet (33) faces the connecting water port (212), and the height of the water outlet (33) is lower than the second opening (23).

7. A lime kiln tail gas treatment device according to claim 5, characterized in that: The invention also comprises a second nozzle (4), wherein the second nozzle (4) is arranged in the housing (1) and is located below the first nozzle (3); the second nozzle (4) has the same structure as the first nozzle (3); the water mist sprayed from the second nozzle (4) separates the second air cavity (14) into an adsorption area (141) and a clean area (142).

8. A lime kiln tail gas treatment device according to claim 7, characterized in that: The water outlet (33) of the second nozzle (4) is inclined downward.

9. A lime kiln tail gas treatment device according to claim 1, characterized in that: The housing (1) has an outlet (16), the height of the outlet (16) being lower than the height of the air outlet (12), and further comprises: A collecting cylinder (5), the collecting cylinder (5) having a water inlet (51), the water inlet (51) being in communication with the outlet (16); A collecting bin (6), the collecting bin (6) being detachably arranged in the collecting cylinder (5); A diaphragm (7), wherein the diaphragm (7) is arranged at the bottom of the collecting chamber (6), and the diaphragm (7) is used to allow water molecules to pass through.

10. A lime kiln tail gas treatment device according to claim 9, characterized in that: Also includes: An extrusion piston (8), the extrusion piston (8) being slidably disposed in the collection barrel (5), the extrusion piston (8) abutting against or canceling the abutment with the collection bin (6) after sliding, and an extrusion space being formed between the extrusion piston (8) and the collection bin (6).

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