CN216745504U - Regulation and control system for preventing liquid ammonium bisulfate from being generated in kiln exhaust pipeline - Google Patents
Regulation and control system for preventing liquid ammonium bisulfate from being generated in kiln exhaust pipeline Download PDFInfo
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- CN216745504U CN216745504U CN202220002762.5U CN202220002762U CN216745504U CN 216745504 U CN216745504 U CN 216745504U CN 202220002762 U CN202220002762 U CN 202220002762U CN 216745504 U CN216745504 U CN 216745504U
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Abstract
The utility model relates to the technical field of smoke exhaust or exhaust gas devices, and discloses a regulation and control system for preventing liquid ammonium bisulfate from being generated in a kiln exhaust pipeline, which comprises a quenching and desublimation box, a denitration catalyst and a denitration catalyst, wherein the quenching and desublimation box is arranged in the kiln exhaust pipeline for burning the denitration catalyst and is used for rapidly reducing the temperature of furnace gas; gas inlets are arranged on the section of the exhaust pipeline in front of the quenching and desublimation box at intervals along the length direction of the exhaust pipeline, each gas inlet is respectively communicated with furnace chambers with different temperatures in the kiln through temperature-regulating communicating pipes, and each temperature-regulating communicating pipe is respectively provided with an exhaust regulating valve for regulating gas flow; a baffle plate for promoting the mixing of furnace gas and air is arranged in the quenching and desublimation box, and the quenching and desublimation box is communicated with an air outlet of the fan through an air mixing pipeline. In the utility model, the temperature of the furnace gas is controlled to be higher than 250 ℃ or lower than 147 ℃, and the desublimation is promoted by adopting a quenching mode, so that the phenomenon that the pipeline is blocked and the equipment is damaged due to the pollution of the rhinorrhea-shaped ammonium bisulfate is avoided.
Description
Technical Field
The utility model relates to the technical field of smoke exhaust or waste gas exhaust devices, in particular to a regulation and control system for preventing liquid ammonium bisulfate from being generated in a kiln exhaust pipeline.
Background
The denitration catalyst which is put into use at present mainly comprises a vanadium-based catalyst, and the production process of the catalyst mainly comprises the steps of mixing, extruding, drying, high-temperature sintering and the like. Because the ingredients such as ammonia salt, sulfate, persulfate and the like are often needed in the preparation process, the gas discharged from the kiln for burning the catalyst contains water vapor, ammonia gas and sulfur trioxide (the denitration vanadium-based catalyst can also oxidize the sulfur dioxide into sulfur trioxide, even if the persulfate is used in the preparation of the catalyst, the final pyrolysis product is also sulfur trioxide because of the air in the kiln).
When the temperature of the gas exhausted from the kiln is between 147 ℃ and 250 ℃, the liquid ammonium bisulfate in a snivel shape is generated on the inner wall of the exhaust pipeline, and the liquid ammonium bisulfate is attached to the inner wall of the pipeline, blocks the pipeline and is difficult to clean, and adsorbs fly ash. In addition, applicants have found that quenching the furnace gas to below 147 ℃ favours smaller particles being formed, more favours the small particles of ammonium sulphate/ammonium bisulphate carried by the gas stream and a higher proportion of ammonium sulphate (more stable than ammonium bisulphate) in the product.
SUMMERY OF THE UTILITY MODEL
The utility model provides a regulation and control system for preventing liquid ammonium bisulfate from being generated in an exhaust pipeline of a kiln.
The technical problem to be solved is that: in the exhaust duct of a kiln for firing a denitration catalyst, when the temperature of gas is 147 ℃ to 250 ℃, liquid ammonium bisulfate in the form of a snivel is generated on the inner wall of the exhaust duct, and adheres to the inner wall of the duct to block the duct and is difficult to clean.
In order to solve the technical problems, the utility model adopts the following technical scheme: a regulation and control system for preventing liquid ammonium bisulfate from being generated in an exhaust pipeline of a kiln, which is arranged on the exhaust pipeline of the kiln for burning a denitration catalyst and is used for preventing the inner wall of the exhaust pipeline from generating the liquid ammonium bisulfate in a snivel shape, wherein the kiln is a continuous kiln controlled by a DCS system, and gas discharged from a furnace chamber of the kiln is recorded as furnace gas; the regulating and controlling system comprises a quenching and desublimation box which is arranged in an exhaust pipeline and used for rapidly reducing the temperature of furnace gas, and temperature sensors which are electrically connected with the DCS system are arranged at the positions of the exhaust pipeline in front of and behind the quenching and desublimation box;
the section of the exhaust pipeline in front of the quenching and desublimation box is provided with air inlets at intervals along the length direction of the exhaust pipeline, each air inlet is respectively communicated with furnace chambers at different temperatures in the kiln through temperature-regulating communicating pipes, each temperature-regulating communicating pipe is respectively provided with an exhaust regulating valve for regulating the gas flow, and the exhaust regulating valve is an automatic valve electrically connected with a DCS (distributed control system);
the quenching and desublimation box is internally provided with a baffle plate for promoting the mixing of furnace gas and air, the baffle plate is perpendicular to the exhaust pipeline, and the quenching and desublimation box is communicated with an air outlet of the fan through an air mixing pipeline.
Further, the temperature-adjusting communicating pipe is respectively communicated with a furnace chamber section with the temperature higher than 250 ℃ and a furnace chamber section with the temperature lower than 250 ℃, and a temperature sensor electrically connected with the DCS system is respectively arranged in each furnace chamber section.
Further, the quenching and desublimation box is a cylindrical container with a horizontal central axis, and the inner diameter of the cylindrical container is larger than that of an exhaust pipeline in front of the quenching and desublimation box.
Furthermore, the central axis of the quenching and desublimation box is horizontally arranged, the part of the exhaust pipeline positioned in front of the quenching and desublimation box is marked as a high-temperature pipe, and the part positioned behind the quenching and desublimation box is marked as a low-temperature pipe; the high-temperature tube is obliquely led into one end surface of the quenching and desublimation box from one end of the quenching and desublimation box, and the low-temperature tube is obliquely led into the quenching and desublimation box from the position, far away from the high-temperature tube, at the top of the quenching and desublimation box; and the quenching and desublimation box is also provided with an overhaul valve and an emptying valve which are convenient for cleaning internal sediments.
Further, an air mixing adjusting valve used for adjusting the flow of air mixed into the furnace gas is arranged on the air mixing pipeline, and the air mixing adjusting valve is an automatic valve electrically connected with the DCS system.
Further, an air temperature sensor used for monitoring the temperature of furnace gas mixed with air is also arranged in the quenching and desublimation box.
Further, the inner diameter of the exhaust pipeline is gradually enlarged along the flowing direction of gas in the pipeline.
Further, an expansion joint is arranged on the exhaust pipeline.
Further, acid-resistant coatings are arranged on the inner wall of the exhaust pipeline, the inner wall of the quenching and desublimation box and the surfaces of the baffle plates.
Furthermore, the exhaust duct is arranged in parallel to the kiln, the direction of air flow in the exhaust duct is opposite to the moving direction of materials in the kiln, and the temperature-adjusting communicating pipe is vertically arranged.
Compared with the prior art, the regulation and control system for preventing the liquid ammonium bisulfate from being generated in the kiln exhaust pipeline has the following beneficial effects:
in the utility model, the temperature of the exhaust pipeline in front of the quenching desublimation box is higher than 250 ℃ by arranging a plurality of temperature-regulating communicating pipes with exhaust regulating valves and adopting furnace gas with higher temperature to heat the furnace gas with lower temperature; by arranging the quenching and desublimation box, normal-temperature air is doped into furnace gas, so that the furnace gas passing through the quenching and desublimation box is quickly diluted and rapidly cooled to below 147 ℃, thereby generating small-particle ammonium sulfate/ammonium bisulfate which is easily carried by air flow. The combination of the two avoids the pollution of the snivel ammonium bisulfate on the pipeline and the damage of the equipment.
Drawings
FIG. 1 is a schematic diagram of a regulation system for preventing the generation of liquid ammonium bisulfate in a kiln exhaust duct according to the present invention;
FIG. 2 is a schematic view of the internal structure of a quench desublimation tank;
the system comprises a kiln 1, a kiln 2, an exhaust pipeline 3, a temperature regulating communicating pipe 31, an exhaust regulating valve 4, a quenching desublimation box 41, a baffle plate 42, an air mixing pipeline 43, an air mixing regulating valve and an air temperature sensor 44.
Detailed Description
As shown in fig. 1-2, a regulation and control system for preventing liquid ammonium bisulfate from being generated in an exhaust duct of a kiln 1 for burning a denitration catalyst is arranged on the exhaust duct 2 of the kiln 1 for preventing the generation of rhinorrhea-shaped liquid ammonium bisulfate on the inner wall of the exhaust duct 2, the kiln 1 is a continuous kiln controlled by a DCS system and having a temperature gradually increased along the moving direction of materials in the kiln 1, an insulating layer is arranged on the exhaust duct 2, and gas discharged from a furnace chamber of the kiln 1 is recorded as furnace gas; the regulating and controlling system comprises a quenching and desublimating box 4 which is arranged in the exhaust pipeline 2 and used for rapidly reducing the temperature of furnace gas, and temperature sensors which are electrically connected with the DCS system are arranged at the front and the rear positions of the exhaust pipeline 2 in the quenching and desublimating box 4;
the difference in temperature between the front and rear of the quench-desublimation tank 4 is large, the furnace gas temperature in the exhaust pipe 2 located in front of the quench-desublimation tank 4 is 250 ℃ or higher, and the furnace gas temperature in the exhaust pipe 2 located behind the quench-desublimation tank 4 is 147 ℃ or lower. The quenching function is to avoid the generation of the snivel ammonium bisulfate, and also has the function of avoiding the overhigh gas temperature in the subsequent working section, because the equipment in the subsequent working section, such as an ammonia absorption tower, is generally made of glass fiber reinforced plastic and cannot resist high temperature.
The section of the exhaust pipeline 2 in front of the quenching and desublimation box 4 is provided with air inlets at intervals along the length direction of the exhaust pipeline 2, each air inlet is respectively communicated with furnace chambers with different temperatures in the kiln 1 by a temperature-regulating communicating pipe 3, each temperature-regulating communicating pipe 3 is respectively provided with an exhaust regulating valve 31 for regulating the gas flow, and the exhaust regulating valve 31 is an automatic valve electrically connected with a DCS system; here, a temperature sensor electrically connected to the DCS system may be provided in the exhaust pipe 2 near the gas inlet, but in the present embodiment, the temperature is lower as the exhaust pipe 2 is closer to the rapid cooling and desublimation tank 4, and is positioned before the rapid cooling and desublimation tank 4; on the other hand, in the exhaust gas pipe 2 located in front of the quench-desublimation tank 4, the temperature increases as the distance from the quench-desublimation tank 4 increases, and therefore, temperature sensors are mainly provided in front of and behind the quench-desublimation tank 4.
A baffle plate 41 for promoting the mixing of furnace gas and air is arranged in the quenching and desublimation box 4, the baffle plate 41 is arranged perpendicular to the exhaust pipeline 2, and the quenching and desublimation box 4 is communicated with an air outlet of the fan through an air mixing pipeline 42.
The baffle plates 41 are arranged at the top and the bottom of the inner wall of the quenching and desublimation box 4, and normal temperature air is introduced into the top and the bottom of the quenching and desublimation box 4 along a plurality of air mixing pipelines 42, so that furnace gas fluctuates up and down in the box and is in cross flow contact and mixed with the normal temperature air in a high turbulent flow state, the uniform contact and mixing of the furnace gas and the normal temperature air are ensured, and the formation of large-particle ammonium sulfate/ammonium bisulfate particles which cannot be carried by air flow at local parts due to nonuniform mixing is avoided; meanwhile, in furnace gas fluctuating up and down, desublimated nuclei such as fly ash can roll up and down under the combined action of air flow carrying force and gravity to rapidly grow into ammonium sulfate/ammonium bisulfate crystal particles, and the crystals rapidly grow to be beneficial to obtaining fine crystals.
The furnace chamber sections communicated with the temperature adjusting communicating pipe 3 of the furnace 1 comprise furnace chamber sections with the temperature higher than 250 ℃ and furnace chamber sections with the temperature lower than 250 ℃, and temperature sensors electrically connected with a DCS system are respectively arranged in each furnace chamber section. The positions of the furnace chamber sections of different temperatures are fixed.
Furnace gases at different positions, namely different temperatures, in the kiln 1 are adjusted in proportion through the exhaust regulating valve 31, mixed into a mixed gas at 250 ℃ and then enter the quenching desublimation box 4. If the temperature is too high, the heat loss of the kiln 1 is serious, the heat-labile components in the subsequent working section can be affected, and if the temperature is too low, the snivel ammonium bisulfate can be generated, so that the furnace gas with the temperature higher than 250 ℃ is mixed with the kiln 1 gas with the temperature lower than 250 ℃.
The furnace gas with higher temperature is merged into the exhaust pipeline 2 earlier, so that the gas in the pipe can be ensured to belong to the working condition of high-temperature gas with small low-temperature gas mixing amount and large low-temperature gas mixing amount, and the temperature in the high-temperature pipe is gradually reduced from the beginning to the end, so that the temperature in the whole exhaust pipe is ensured to be higher than 250 ℃ while the temperature of the furnace gas finally entering the quenching desublimation box 4 is ensured to be 250 ℃, and meanwhile, the length of the temperature-adjusting communicating pipe 3 can be made very short, and the phenomenon that the rhinorrhoea-shaped ammonium bisulfate is generated in the temperature-adjusting communicating pipe 3 communicated with the furnace chamber with lower temperature in sections is avoided. The specific layout may be as follows: the exhaust pipeline 2 is arranged in parallel to the kiln 1, the direction of air flow in the exhaust pipeline 2 is opposite to the moving direction of materials in the kiln 1, and the temperature-adjusting communicating pipe 3 is vertically arranged.
The quenching and desublimation tank 4 is a cylindrical container with a horizontal central axis, and the inner diameter of the cylindrical container is larger than that of the exhaust pipeline 2 in front of the quenching and desublimation tank 4. The central axis of the quenching and desublimation box 4 is horizontally arranged, the part of the exhaust pipeline 2 positioned in front of the quenching and desublimation box 4 is marked as a high-temperature pipe, and the part positioned behind the quenching and desublimation box 4 is marked as a low-temperature pipe; one end surface of the rapid cooling and desublimation box 4 is obliquely and downwards introduced into one end surface of the rapid cooling and desublimation box 4 from one end of the rapid cooling and desublimation box 4, and the position of the top of the rapid cooling and desublimation box 4, which is far away from the high temperature tube, is obliquely and downwards introduced into the rapid cooling and desublimation box 4 from the low temperature tube; the quenching and desublimation box 4 is also provided with an overhaul valve and a blow-down valve which are convenient for cleaning internal sediments.
Here, the quench desublimation tank 4 is the lowest point in the entire exhaust gas pipe 2, and if a high boiling point liquid such as sulfuric acid is generated in the pipe, it can flow to the quench desublimation tank 4 along the pipe and be discharged, and if particles are deposited on the inner wall of the quench desublimation tank 4, it is also possible to open an inspection valve for cleaning.
The air mixing pipeline 42 is provided with an air mixing adjusting valve 43 for adjusting the flow of air mixed into the furnace gas, and the air mixing adjusting valve 43 is an automatic valve electrically connected with the DCS system. The quenching and desublimation box 4 is also internally provided with an air temperature sensor 44 for monitoring the temperature of furnace gas mixed with air. Thus, when the temperature in the quenching and desublimation box 4 is too high, the temperature can be reduced by adjusting the air quantity.
The inner diameter of the exhaust pipe 2 is gradually enlarged along the flowing direction of the gas in the pipe so as to adapt to the working condition that the gas gradually converges into the exhaust pipe 2.
Be provided with the expansion joint on the 2 expansion joints of exhaust duct, owing to need adjust the air displacement in this application, it is more obvious to lead to cold and hot change on the pipeline, just sets up an expansion joint between per two air inlets best.
The inner wall of the exhaust pipeline 2, the inner wall of the quenching and desublimating box 4 and the surface of the baffle plate 41 are all provided with acid-resistant coatings.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A regulation and control system for preventing liquid ammonium bisulfate from being generated in an exhaust pipeline of a kiln (1) for burning a denitration catalyst is arranged on the exhaust pipeline (2) of the kiln (1) for preventing the inner wall of the exhaust pipeline (2) from generating the liquid ammonium bisulfate in a snivel shape, the kiln (1) is a continuous kiln controlled by a DCS system, and gas discharged from a furnace chamber of the kiln (1) is recorded as furnace gas; the method is characterized in that: the regulation and control system comprises a quenching and desublimation box (4) which is arranged in the exhaust pipeline (2) and is used for rapidly reducing the temperature of furnace gas, and temperature sensors which are electrically connected with the DCS system are arranged at the front and the back of the quenching and desublimation box (4) of the exhaust pipeline (2);
gas inlets are arranged on the section of the exhaust pipeline (2) in front of the quenching and desublimation box (4) at intervals along the length direction of the exhaust pipeline (2), each gas inlet is communicated with furnace chambers with different temperatures in the kiln (1) in sections through temperature-regulating communicating pipes (3), each temperature-regulating communicating pipe (3) is provided with an exhaust regulating valve (31) for regulating gas flow, and each exhaust regulating valve (31) is an automatic valve electrically connected with a DCS (distributed control system);
a baffle plate (41) for promoting the mixing of furnace gas and air is arranged in the quenching and desublimation box (4), the baffle plate (41) is perpendicular to the exhaust pipeline (2), and the quenching and desublimation box (4) is communicated with an air outlet of the fan through an air mixing pipeline (42).
2. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in a kiln exhaust pipeline according to claim 1, wherein: the temperature-adjusting communicating pipe (3) is respectively communicated with a furnace chamber section with the temperature higher than 250 ℃ and a furnace chamber section with the temperature lower than 250 ℃, and a temperature sensor electrically connected with the DCS system is respectively arranged in each furnace chamber section.
3. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in an exhaust pipeline of a kiln according to claim 1, wherein: the quenching and desublimation box (4) is a cylindrical container with a horizontal central axis, and the inner diameter of the cylindrical container is larger than that of the exhaust pipeline (2) in front of the quenching and desublimation box (4).
4. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in a kiln exhaust pipeline according to claim 3, wherein: the central axis of the quenching and desublimation box (4) is horizontally arranged, the part of the exhaust pipeline (2) positioned in front of the quenching and desublimation box (4) is marked as a high-temperature pipe, and the part positioned behind the quenching and desublimation box (4) is marked as a low-temperature pipe; the high-temperature tube is obliquely led into one end surface of the rapid cooling and desublimation box (4) from one end of the rapid cooling and desublimation box (4), and the low-temperature tube is obliquely led into the rapid cooling and desublimation box (4) from the position, far away from the high-temperature tube, on the top of the rapid cooling and desublimation box (4); and the quenching and desublimation box (4) is also provided with an overhaul valve and an emptying valve which are convenient for cleaning internal sediments.
5. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in an exhaust pipeline of a kiln according to claim 1, wherein: the air mixing pipeline (42) is provided with an air mixing adjusting valve (43) used for adjusting the flow of air mixed into the furnace gas, and the air mixing adjusting valve (43) is an automatic valve electrically connected with the DCS.
6. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in a kiln exhaust pipeline according to claim 1, wherein: and an air temperature sensor (44) for monitoring the temperature of furnace gas mixed with air is also arranged in the quenching and desublimation box (4).
7. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in a kiln exhaust pipeline according to claim 1, wherein: the inner diameter of the exhaust pipeline (2) is gradually enlarged along the flowing direction of gas in the pipeline.
8. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in a kiln exhaust pipeline according to claim 1, wherein: and an expansion joint is arranged on the exhaust pipeline (2).
9. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in a kiln exhaust pipeline according to claim 1, wherein: acid-resistant coatings are arranged on the inner wall of the exhaust pipeline (2), the inner wall of the quenching and desublimation box (4) and the surface of the baffle plate (41).
10. The regulation and control system for avoiding the generation of liquid ammonium bisulfate in a kiln exhaust pipeline according to claim 1, wherein: the exhaust pipeline (2) is arranged in parallel to the kiln (1), the direction of air flow in the exhaust pipeline (2) is opposite to the moving direction of materials in the kiln (1), and the temperature adjusting communicating pipe (3) is vertically arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220002762.5U CN216745504U (en) | 2022-01-04 | 2022-01-04 | Regulation and control system for preventing liquid ammonium bisulfate from being generated in kiln exhaust pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220002762.5U CN216745504U (en) | 2022-01-04 | 2022-01-04 | Regulation and control system for preventing liquid ammonium bisulfate from being generated in kiln exhaust pipeline |
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| Publication Number | Publication Date |
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| CN216745504U true CN216745504U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220002762.5U Active CN216745504U (en) | 2022-01-04 | 2022-01-04 | Regulation and control system for preventing liquid ammonium bisulfate from being generated in kiln exhaust pipeline |
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| CN (1) | CN216745504U (en) |
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- 2022-01-04 CN CN202220002762.5U patent/CN216745504U/en active Active
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