A low-temperature denitration system for a sintering machine

Abstract

The present invention discloses a low-temperature denitration system for a sintering machine, belonging to the technical field of air treatment equipment, which includes a sintering machine and a denitration tower. The denitration tower includes a tower body, a desulfurization component and a catalytic component. The tower body has a sealed cavity, and the cavity is communicated with an air inlet end and an air outlet end. The desulfurization component is installed in the tower body, and the flue gas entering the cavity flows towards the air outlet end through the desulfurization component. The desulfurization component includes an annular body one, a disc body and an annular body two which are sequentially installed in the tower body from top to bottom. The disc body divides the chamber between the annular body one and the annular body two into a chamber one and a chamber two. The flue gas entering the annular body one enters the annular body two through a connecting pipe one and undergoes a desulfurization reaction with the solution inside the annular body two. The catalytic component is installed in the tower body, and the discharged flue gas undergoes denitration through the catalytic component. This invention reacts sodium carbonate solution with sulfur dioxide gas in the flue gas to avoid the problem that sulfur dioxide gas enters the catalyst and causes the catalyst to fail.

Description

Technical Field

[0001] The present invention relates to the field of air treatment equipment, and particularly to a low-temperature denitration system for a sintering machine. Background Art

[0002] With the development of the national economy and the increasing improvement of people's living standards, environmental problems have received more and more attention from people. As pollutants closely related to air quality, nitrogen oxides have always been the focus of national attention. As a key NOx emission source, the denitration of sintering machines in iron and steel enterprises has also received more and more attention.

[0003] In low-temperature denitration, the denitration reaction needs to rely on the catalytic reaction of a catalyst. Since the flue gas generated by the sintering machine contains sulfur dioxide gas, the main components of common SCR denitration catalysts are titanium dioxide, vanadium pentoxide, tungsten trioxide, etc. Sulfur dioxide gas is prone to react with the catalyst, causing the catalyst to fail. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a low-temperature denitration system for a sintering machine, including a sintering machine and a denitration tower. The smoke exhaust passage of the sintering machine is communicated with the smoke inlet passage of the denitration tower.

[0005] The denitration tower includes a tower body, a desulfurization component, and a catalytic component. The tower body has a sealed cavity, which is communicated with an air inlet end and an air outlet end. The desulfurization component is installed in the tower body. The flue gas entering the cavity flows through the desulfurization component to the air outlet end. The desulfurization component includes a first ring body, a disc body, and a second ring body installed in the tower body from top to bottom in sequence. The disc body divides the chamber between the first ring body and the second ring body into a first chamber and a second chamber. The flue gas entering the first ring body enters the second ring body through a first connecting pipe and undergoes a desulfurization reaction with the solution inside the second ring body. The desulfurized gas enters the second chamber end and flows through a second connecting pipe to the air outlet end. The catalytic component is installed in the tower body, and the exhausted flue gas undergoes denitration through the catalytic component.

[0006] Further, the tower body includes a base, a cylinder body, and a cover body. The cylinder body is vertically placed. The upper port of the cylinder body is sealed by the cover body, and the lower port of the cylinder body is sealed by the base. The cylinder body is communicated with an exhaust pipe and an inlet pipe. The inlet pipe is located above the exhaust pipe.

[0007] Further, the inlet pipe is communicated with the inside of the cylinder body through a stepped hole formed on the inner wall of the cylinder body. An air dust removal component distributed coaxially is installed in the inlet pipe, and the air outlet end of the air dust removal component is installed in the stepped hole.

[0008] Furthermore, the dust removal assembly includes a tube body, spiral blade one and spiral blade two, the outer side of the tube body is provided with spiral blade one, the inner side of the tube body is provided with spiral blade two, a plurality of strip grooves are penetrated through the side wall of the tube body, wherein the width of the strip grooves narrows toward the air inlet end of the tube body, the tube body is installed in the air inlet pipe, the air outlet end of the tube body is installed in the step hole, a bearing is sleeved on the outer side of the air inlet end of the tube body, and is installed in the port of the air inlet pipe, the spiral blade one is located in the annular chamber formed by the tube body and the air inlet pipe, a dust outlet groove is opened on the bottom side of the air inlet pipe, and a dust collecting groove is installed on the outer side of the dust outlet groove.

[0009] Further, the ring body 1 and the ring body 2 are both cylindrical structures with one end closed, the opening of the installed ring body 1 and the opening of the ring body 2 face oppositely, the bottom surface of the ring body 1 is provided with a plurality of air inlet holes in an annular shape, the air inlet holes are connected with the cavity 1, the bottom surface of the ring body 2 is provided with a plurality of annularly distributed exhaust holes, the exhaust holes are connected with the cavity 2, the cavity 2 is connected with a connecting pipe, the opening of the ring body 2 is closed by a sealing cover, the chamber of the ring body 2 is filled with a sodium carbonate solution, the ring body 2 is connected with the ring body 1 through a connecting pipe 1, the connecting pipe 2 passing through the ring body 2 realizes the connection between the cavity 2 and the cylinder, and the port of the connecting pipe 2 is higher than the end surface of the ring body 2;

[0010] The gas entering through the air inlet pipe enters cavity one, passes through the air inlet hole into ring body one, and enters the interior of ring body two through connecting pipe one, and reacts with the sodium carbonate solution to remove the sulfur dioxide gas contained in the flue gas. The reacted gas enters cavity two through the exhaust hole, and enters the cylinder downward through connecting pipe two passing through ring body two.

[0011] Furthermore, an arc-shaped opening is opened on the side wall of the cylinder, and the arc-shaped opening forms cavity one and cavity two. A hinge seat is provided on both sides of the arc-shaped opening, and an arc-shaped plate is installed on the hinge seat. The two arc-shaped plates complete the closure of the arc-shaped opening and are locked by a lock body. A connecting pipe is provided on the arc-shaped plate.

[0012] Furthermore, the cover body is connected to a spiral rod extending into the cylinder, the bottom end of the spiral rod is located in the ring body, the upper side of the ring body is provided with a conical shell located in the cylinder, the upper side surface of the spiral rod is in contact with the inner wall of the conical shell, and the cover body is equipped with a motor connected to the spiral rod.

[0013] Furthermore, the catalytic component is a disc-shaped catalyst, and a plurality of circular holes are provided on the disc-shaped catalyst.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. A sewage discharge pipe is provided on the side surface of the cylinder body of the present invention. The sewage discharge pipe is communicated with the interior of the second ring body. The reacted solution is discharged through the sewage discharge pipe. A three-way valve is communicated on the connecting pipe to realize the addition of sodium carbonate solution into the interior of the second cavity. The added solution enters the interior of the second ring body through the exhaust hole, and the excessive solution is discharged through the three-way valve, so as to ensure that the liquid level surface in the second ring body is higher than the bottom end face of the first connecting pipe, thereby realizing the full mixing of the flue gas and the solution.

[0016] 2. During the mixing process of the flue gas and the solution in the present invention, it is convenient to remove the dust in the flue gas, and at the same time, the incoming flue gas is cooled. By reacting the sodium carbonate solution with the sulfur dioxide gas in the flue gas, the problem of catalyst failure caused by the sulfur dioxide gas entering the catalyst is avoided.

[0017] 3. The motor installed in the present invention drives the screw rod to rotate slowly. The slowly rotating screw rod drives the dust impurities in the air inside the first ring body to move upward. The dust passes through the air holes on the screw rod and enters the interior of the first connecting pipe, realizing simple impurity removal work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structure schematic diagram of the present invention;

[0019] Figure 2 is the overall sectional structure schematic diagram of the present invention;

[0020] Figure 3 is the schematic diagram of the cooperation structure of the cylinder body and the screw rod of the present invention;

[0021] Figure 4 is the sectional structure schematic diagram of the cooperation of the cylinder body and the screw rod of the present invention;

[0022] Figure 5 is the schematic diagram of the desulfurization component structure of the present invention;

[0023] Figure 6 is the sectional structure schematic diagram of the desulfurization component of the present invention;

[0024] Figure 7 is the schematic diagram of the cylinder body structure of the present invention;

[0025] Figure 8 is the sectional structure schematic diagram of the cylinder body of the present invention;

[0026] Figure 9 is the schematic diagram of the dust removal component structure of the present invention;

[0027] Figure 10 is the schematic diagram of the denitration system structure of the present invention.

[0028] In the figure: A, sintering machine; B, denitration tower; 1, base; 2, cylinder; 201, exhaust pipe; 202, intake pipe; 2021, dust outlet trough; 2022, stepped hole; 203, dust removal pipe; 204, arc plate; 205, connecting pipe; 206, lock body; 207, hinge seat; 208, arc opening; 3, cover body; 4, first annular body; 401, intake hole; 5, disc body; 6, second annular body; 601, exhaust hole; 7, first connecting pipe; 8, second connecting pipe; 9, sealing cover; 10, first cavity; 11, second cavity; 12, screw rod; 13, conical shell; 14, motor; 15, pipe body; 1501, strip groove; 16, bearing; 17, first spiral blade; 18, second spiral blade; 19, dust collection trough; 20, catalyst. Detailed implementation manner

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0030] Please refer to Figures 1 - 10 As shown, the present invention is a low-temperature denitration system for a sintering machine, including a sintering machine A and a denitration tower B. The smoke exhaust channel of the sintering machine A is communicated with the smoke inlet channel of the denitration tower B;

[0031] The denitration tower B includes:

[0032] A tower body having a closed cavity, the cavity is communicated with an air inlet end and an air outlet end, facilitating the passage of the flue gas generated by the sintering machine A through the tower body, and an air pump is installed at the air inlet end or the air outlet end of the tower body to facilitate driving the air to flow inside the tower body;

[0033] A desulfurization component installed inside the tower body, and the flue gas entering the cavity flows through the desulfurization component to the air outlet end;

[0034] The desulfurization component includes a first annular body 4, a disc body 5, and a second annular body 6 sequentially installed from top to bottom inside the tower body;

[0035] The disc body 5 divides the chamber between the first annular body 4 and the second annular body 6 into a first cavity 10 and a second cavity 11;

[0036] The flue gas entering the first annular body 4 enters the second annular body 6 through the first connecting pipe 7 and undergoes a desulfurization reaction with the solution inside the second annular body 6;

[0037] The desulfurized gas enters the inner part of the second cavity 11 and flows towards the exhaust end through the second connecting pipe 8;

[0038] Both the first ring body 4 and the second ring body 6 are cylindrical structures with one end closed. The openings of the installed first ring body 4 and the second ring body 6 face in opposite directions. A plurality of air inlet holes 401 are annularly formed on the bottom surface of the first ring body 4, and the air inlet holes 401 communicate with the first cavity 10. A plurality of annularly distributed exhaust holes 601 are formed on the bottom surface of the second ring body 6, and the exhaust holes 601 communicate with the second cavity 11. The second cavity 11 communicates with the provided connecting pipe 205. The opening of the second ring body 6 is closed by a sealing cover 9. A sodium carbonate solution is filled in the cavity of the second ring body 6. The second ring body 6 communicates with the first ring body 4 through the first connecting pipe 7. The second connecting pipe 8 passing through the second ring body 6 realizes the communication between the second cavity 11 and the cylinder body 2. The port of the second connecting pipe 8 is higher than the end surface of the second ring body 6;

[0039] The gas entering through the inlet pipe 202 enters the first cavity 10, passes through the air inlet holes 401 and enters the first ring body 4, and then enters the interior of the second ring body 6 through the first connecting pipe 7, and reacts with the sodium carbonate solution to remove the sulfur dioxide gas contained in the flue gas. The reacted gas enters the second cavity 11 through the exhaust holes 601 and enters the cylinder body 2 downward through the second connecting pipe 8 passing through the second ring body 6;

[0040] A sewage discharge pipe is provided on the side surface of the cylinder body 2, and the sewage discharge pipe communicates with the interior of the second ring body 6. The reacted solution is discharged through the sewage discharge pipe. A three-way valve is connected to the connecting pipe 205 to realize the addition of sodium carbonate solution into the second cavity 11. The added solution enters the interior of the second ring body 6 through the exhaust holes 601, and the excessive solution is discharged through the three-way valve, so as to ensure that the liquid level surface inside the second ring body 6 is higher than the bottom end surface of the first connecting pipe 7, thereby realizing the full mixing of the flue gas and the solution;

[0041] During the mixing process of the flue gas and the solution, it is convenient to remove the dust in the flue gas, and at the same time complete the cooling of the incoming flue gas. By reacting the sodium carbonate solution with the sulfur dioxide gas in the flue gas, the problem that the sulfur dioxide gas enters the catalyst 20 and causes the catalyst 20 to fail is avoided.

[0042] Catalytic assembly, the catalytic assembly is installed in the tower body, and the discharged flue gas passes through the catalytic assembly for denitrification.

[0043] The tower body includes a base 1, a cylinder body 2 and a cover body 3. The cylinder body 2 is vertically arranged. The upper port of the cylinder body 2 is sealed by the cover body 3, and the lower port of the cylinder body 2 is sealed by the base 1. An exhaust pipe 201 and an inlet pipe 202 are connected to the cylinder body 2, and the inlet pipe 202 is located above the exhaust pipe 201.

[0044] The air inlet pipe 202 is connected to the interior of the cylinder 2 through a step hole 2022 provided on the inner wall of the cylinder 2 . A coaxially distributed dust removal component is installed in the air inlet pipe 202 , and an air outlet end of the dust removal component is installed in the step hole 2022 .

[0045] The dust removal assembly includes a tube body 15, a spiral blade 17 and a spiral blade 2 18. The outer side of the tube body 15 is provided with a spiral blade 17, and the inner side of the tube body 15 is provided with a spiral blade 2 18. A plurality of strip grooves 1501 are penetrated through the side wall of the tube body 15, wherein the width of the strip groove 1501 narrows toward the air inlet end of the tube body 15. The tube body 15 is installed in the air inlet pipe 202, and the air outlet end of the tube body 15 is installed in the step hole 2022. The outer side of the air inlet end of the tube body 15 is sleeved with a bearing 16, and is installed in the port of the air inlet pipe 202. The spiral blade 17 is located in the annular chamber formed by the tube body 15 and the air inlet pipe 202. A dust outlet groove 2021 is opened on the bottom side of the air inlet pipe 202, and a dust collecting groove 19 is installed on the outer side of the dust outlet groove 2021.

[0046] During the air intake process, the fast-flowing air passes through the spiral blade 2 18, thereby driving the tube body 15 to rotate as a whole. Since the spiral blade 17 and the spiral blade 2 18 have opposite rotation directions and the spiral blade 17 occupies a small cross-section, the rotating spiral blade 17 does not force air intake. The rotating spiral blade 17 pushes the outer gas through the strip groove 1501 and the dust outlet groove 2021 into the dust collecting groove 19 for discharge.

[0047] During the rotation of the tube body 15, the particulate matter in the generated flue gas moves outward under the action of centrifugal force, so that the flue gas discharged through the spiral blade 17 has a high dust content. The outlet end of the dust collecting trough 19 is connected to the flue gas dust reduction equipment, and the dust-removed air is connected to the air inlet pipe 202 again.

[0048] An arc-shaped opening 208 is opened on the side wall of the cylinder 2, and the arc-shaped opening 208 forms cavity 10 and cavity 2 11. A hinge seat 207 is provided on both sides of the arc-shaped opening 208, and an arc-shaped plate 204 is installed on the hinge seat 207. The two arc-shaped plates 204 complete the sealing of the arc-shaped opening 208 and are locked by a lock body 206. A connecting pipe 205 is provided on the arc-shaped plate 204.

[0049] The cover body 3 is connected with a screw rod 12 extending into the cylinder body 2, the bottom end of the screw rod 12 is located in the ring body 14, the upper side of the ring body 14 is provided with a conical shell 13 located in the cylinder body 2, the upper side of the screw rod 12 is in contact with the inner wall of the conical shell 13, and the cover body 3 is equipped with a motor 14 connected to the screw rod 12;

[0050] On the inner wall of the cylinder body 2, there is a dust removal pipe 203 communicating with the chamber between the conical shell 13 and the cover body 3. The impurities moving upward through the screw rod 12 fall onto the conical surface of the conical shell 13 and are cleaned through the dust removal pipe 203.

[0051] The installed motor 14 drives the screw rod 12 to rotate slowly. The slowly rotating screw rod 12 drives the dust and impurities in the air inside the first ring body 4 to move upward, pass through the air holes on the screw rod 12 along the body and enter the inside of the first connecting pipe 7, realizing a simple impurity removal operation.

[0052] The catalytic component is a disc-shaped catalyst 20, and there are several round holes on the disc-shaped catalyst.

[0053] Working principle:

[0054] An air pump is installed at the air inlet end or the exhaust end of the tower body, and the flue gas passes through the tower body by the operation of the air pump;

[0055] The gas entering through the inlet pipe 202 enters the first chamber 10, passes through the air inlet holes 401 and enters the first ring body 4, and then enters the inside of the second ring body 6 through the first connecting pipe 7, and reacts with the sodium carbonate solution to remove the sulfur dioxide gas contained in the flue gas. The reacted gas enters the second chamber 11 through the exhaust holes 601 and then enters the cylinder body 2 downward through the second connecting pipe 8 passing through the second ring body 6;

[0056] A sewage discharge pipe is provided on the side of the cylinder body 2, and the sewage discharge pipe communicates with the inside of the second ring body 6. The reacted solution is discharged through the sewage discharge pipe. A three-way valve is connected to the connecting pipe 205 to realize adding sodium carbonate solution into the second chamber 11. The added solution enters the inside of the second ring body 6 through the exhaust holes 601, and the excessive solution is discharged through the three-way valve, so as to ensure that the liquid level inside the second ring body 6 is higher than the bottom end face of the first connecting pipe 7, thereby realizing full mixing of the flue gas and the solution;

[0057] During the mixing process of the flue gas and the solution, it is convenient to remove the dust in the flue gas, and at the same time, the incoming flue gas is cooled. By reacting the sodium carbonate solution with the sulfur dioxide gas in the flue gas, the problem of the catalyst 20 being deactivated due to the sulfur dioxide gas entering the catalyst 20 is avoided.

[0058] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A low-temperature denitration system for a sintering machine, comprising a sintering machine (A) and a denitration tower (B), wherein the smoke exhaust passage of the sintering machine (A) is communicated with the smoke inlet passage of the denitration tower (B); The denitration tower (B) includes: A tower body having a sealed cavity, which is communicated with an air inlet end and an air outlet end; A desulfurization component installed in the tower body, and the flue gas entering the cavity flows through the desulfurization component to the exhaust end; The desulfurization component includes a first ring body (4), a disc body (5), and a second ring body (6) sequentially installed in the tower body from top to bottom; The disc body (5) divides the chamber between the first ring body (4) and the second ring body (6) into a first cavity (10) and a second cavity (11); The flue gas entering the first ring body (4) enters the second ring body (6) through a first connecting pipe (7) and undergoes a desulfurization reaction with the solution inside the second ring body (6); The desulfurized gas enters the second cavity (11) end and flows through a second connecting pipe (8) to the exhaust end; A catalytic component installed in the tower body, and the discharged flue gas passes through the catalytic component for denitration; The tower body includes a base (1), a cylinder body (2), and a cover body (3). The cylinder body (2) is vertically placed, the upper port of the cylinder body (2) is sealed by the cover body (3), and the lower port of the cylinder body (2) is sealed by the base (1); An exhaust pipe (201) and an inlet pipe (202) are communicated with the cylinder body (2), and the inlet pipe (202) is located above the exhaust pipe (201); Both the first ring body (4) and the second ring body (6) are cylindrical structures with one end closed, and the openings of the installed first ring body (4) and the second ring body (6) face in opposite directions; A plurality of air inlet holes (401) are annularly formed on the bottom surface of the first ring body (4), and the air inlet holes (401) are communicated with the first cavity (10). A plurality of annularly distributed exhaust holes (601) are formed on the bottom surface of the second ring body (6), and the exhaust holes (601) are communicated with the second cavity (11). The second cavity (11) is communicated with a provided connecting pipe (205); The opening of the second ring body (6) is closed by a sealing cover (9), a sodium carbonate solution is filled in the cavity of the second ring body (6), and the second ring body (6) is communicated with the first ring body (4) through a first connecting pipe (7); The second connecting pipe (8) passing through the second ring body (6) realizes the communication between the second cavity (11) and the cylinder body (2), and the port of the second connecting pipe (8) is higher than the end surface of the second ring body (6); The gas entering through the inlet pipe (202) enters the first cavity (10), passes through the air inlet holes (401) and enters the first ring body (4), and enters the inside of the second ring body (6) through the first connecting pipe (7), and reacts with the sodium carbonate solution to remove the sulfur dioxide gas contained in the flue gas. The reacted gas enters the second cavity (11) through the exhaust holes (601) and enters the cylinder body (2) downward through the second connecting pipe (8) passing through the second ring body (6); An arc-shaped opening (208) is opened on the side wall of the cylinder body (2), and the arc-shaped opening (208) forms the first cavity (10) and the second cavity (11); Hinged seats (207) are provided on both sides of the arc-shaped opening (208). An arc-shaped plate (204) is installed on the hinged seat (207). The two arc-shaped plates (204) close the arc-shaped opening (208) and are locked by a lock body (206). A connecting pipe (205) is provided on the arc-shaped plate (204).

2. The low-temperature denitration system of a sintering machine according to claim 1, characterized in that: The intake pipe (202) communicates with the inside of the cylinder body (2) through a stepped hole (2022) formed on the inner wall of the cylinder body (2). A dust removal component distributed coaxially is installed in the intake pipe (202), and the air outlet end of the dust removal component is installed in the stepped hole (2022).

3. The low-temperature denitration system of a sintering machine according to claim 2, characterized in that: The dust removal component includes a pipe body (15), a first spiral blade (17) and a second spiral blade (18). The first spiral blade (17) is provided on the outer side of the pipe body (15), and the second spiral blade (18) is provided on the inner side of the pipe body (15). A plurality of strip-shaped grooves (1501) penetrate through the side wall of the pipe body (15), and the width of the strip-shaped grooves (1501) narrows toward the air inlet end side of the pipe body (15). The pipe body (15) is fitted and installed in the intake pipe (202), and the air outlet end of the pipe body (15) is fitted and installed in the stepped hole (2022). A bearing (16) is sleeved on the outer side of the air inlet end of the pipe body (15) and is fitted and installed in the port of the intake pipe (202). The first spiral blade (17) is located in the annular chamber formed by the pipe body (15) and the intake pipe (202). A dust outlet groove (2021) is opened at the bottom side of the intake pipe (202), and a dust collection groove (19) is installed outside the dust outlet groove (2021).

4. The low-temperature denitration system of a sintering machine according to claim 3, characterized in that: A screw rod (12) extending into the cylinder body (2) is connected to the cover body (3), and the bottom end of the screw rod (12) is located inside the first ring body (4). A conical shell (13) located inside the cylinder body (2) is provided on the upper side of the first ring body (4), and the upper side surface of the screw rod (12) is attached to the inner wall of the conical shell (13). A motor (14) drivingly connected to the screw rod (12) is installed on the cover body (3).

5. The low-temperature denitration system of a sintering machine according to claim 2, characterized in that: The catalytic component is a disc-shaped catalyst (20), and a plurality of round holes are provided on the disc-shaped catalyst.

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