CN218307237U - Integrated device for removing dioxin and NOx at low temperature in cooperation - Google Patents
Integrated device for removing dioxin and NOx at low temperature in cooperation Download PDFInfo
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- CN218307237U CN218307237U CN202222359972.2U CN202222359972U CN218307237U CN 218307237 U CN218307237 U CN 218307237U CN 202222359972 U CN202222359972 U CN 202222359972U CN 218307237 U CN218307237 U CN 218307237U
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Abstract
The utility model relates to an integrated device of low temperature desorption dioxin and NOx in coordination, integrated device of low temperature desorption dioxin and NOx in coordination include intake pipe, desorption device and outlet duct, and intake pipe and outlet duct set up respectively in desorption device's both sides, and desorption device includes casing and ceramic filter tube, and the setting is in the casing from top to bottom to the ceramic filter tube, and the ceramic filter tube includes superficial layerAnd the supporting layer is a through pore structure, the surface layer is communicated with the supporting layer, and the low-temperature composite catalyst for catalyzing and oxidizing dioxin and NOx is filled in the supporting layer. The utility model discloses an integrated device of low temperature desorption dioxin and NOx in coordination, it is rational in infrastructure, with low costs, realized the desorption in coordination of dioxin and NOx, replace current SCR-NH 3 Denitration and dioxin removal equipment effectively simplifies a process system, reduces the occupied area and reduces the pollutant removal cost.
Description
Technical Field
The utility model relates to an environmental protection equipment technical field, concretely relates to integrated device of low temperature desorption dioxin and NOx in coordination.
Background
With the increasing of the environmental protection requirement, the problem that NOx and dioxin in flue gas discharged by combustion heating equipment used in industry exceed the standard is increasingly prominent, the denitration active temperature zone of the conventional SCR catalyst is 300-400 ℃, and the catalytic degradation active temperature zone of the dioxin is 200-300 ℃, so that the two are difficult to realize the synergistic removal in the low temperature zone (less than 200 ℃), and if the two are removed independently, the process is complex, the investment cost is high, and the operation cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a low temperature is desorption dioxin and NOx's integrated device in coordination solves the above-mentioned problem that NOx and dioxin desorption exist among the present combustion heating equipment.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an integrated device for removing dioxin and NOx in low-temperature cooperation mode comprises an air inlet pipe, a removing device and an air outlet pipe, wherein the air inlet pipe and the air outlet pipe are respectively arranged on two sides of the removing device; the removing device comprises a shell and a ceramic filter tube, wherein the ceramic filter tube is vertically arranged in the shell and comprises a surface layer and a supporting layer, the surface layer and the supporting layer are both of a through pore structure, the surface layer and the supporting layer are through, and a low-temperature composite catalyst for catalyzing and oxidizing dioxin and NOx is filled in the supporting layer.
Further, the average pore size of the pores of the surface layer is smaller than the average pore size of the pores of the support layer.
Furthermore, be connected with sodium bicarbonate powder injection apparatus and ammonia injection apparatus on the intake pipe for spray sodium bicarbonate powder and ammonia in the intake pipe, in order to carry out denitration deacidification reaction.
Further, a desulfurizing agent is coated on the surface layer.
Furthermore, an ash hopper is arranged at the lower part of the shell.
The utility model has the advantages that:
the utility model discloses an integrated device of low temperature desorption dioxin and NOx in coordination, realize the desorption in coordination of dioxin and NOx through low temperature composite catalyst, the ceramic chimney filter that sets up about in the casing loads low temperature composite catalyst, the ceramic chimney filter includes superficial layer and supporting layer, superficial layer and supporting layer are the void structure who link up, low temperature composite catalyst loads in the supporting layer, a catalytic decomposition dioxin and NOx, the supporting layer plays the support holding effect to the catalyst, the superficial layer plays the guard action to the catalyst, the wearing and tearing of flue gas granule to the catalyst have been avoided, block up, thereby the life of extension catalyst. The utility model discloses an integrated device of low temperature desorption dioxin and NOx in coordination replaces current SCR-NH 3 Denitration and dioxin removal equipment effectively simplifies a process system, reduces the occupied area and reduces the pollutant removal cost.
Drawings
FIG. 1 is a schematic diagram of an integrated apparatus for the low temperature synergistic removal of dioxins and NOx of the utility model;
FIG. 2 is a schematic view of a ceramic filter tube in the integrated device for low temperature co-removal of dioxin and NOx according to the present invention;
fig. 3 is a schematic view of the cross-section of a ceramic filter tube in the integrated device for low-temperature synergistic removal of dioxin and NOx according to the present invention.
Names corresponding to the marks in the figure:
1. the device comprises an air inlet pipe, 2, a removing device, 21, a shell, 22, a ceramic filter pipe, 221, a surface layer, 222, a supporting layer, 3, an air outlet pipe, 4, a sodium bicarbonate powder injection device, 5, an ammonia gas injection device, 6 and an ash bucket.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
Embodiment 1 of the utility model:
the embodiment of the utility model provides an in low temperature is integrated device of desorption dioxin and NOx in coordination, is through integrated desorption device, carries out the desorption to dioxin and NOx simultaneously, reduces the cost of dioxin and NOx desorption.
Specifically, as shown in fig. 1, the integrated device for removing dioxin and NOx at low temperature in cooperation comprises an air inlet pipe 1, a removing device 2 and an air outlet pipe 3, wherein the air inlet pipe 1 and the air outlet pipe 3 are respectively arranged at two sides of the removing device 2, flue gas enters through the air inlet pipe 1, and after the removal of dioxin and NOx is completed in the removing device 2, clean gas is discharged through the air outlet pipe 3.
In this embodiment, as shown in fig. 1 to fig. 3, the removing device 2 includes a housing 21 and a ceramic filter tube 22, the ceramic filter tube 22 is disposed in the housing 21 up and down, the ceramic filter tube 22 is a hollow tubular structure and includes a surface layer 221 and a support layer 222, the surface layer 221 and the support layer 222 are both through pore structures, the surface layer 221 and the support layer 222 are through, gas can reach the support layer 222 through the surface layer 221, meanwhile, the average pore diameter of pores of the surface layer 221 is smaller than the average pore diameter of pores of the support layer 222, and the support layer 222 is filled with a low-temperature composite catalyst for performing catalytic oxidation decomposition on dioxin and NOx.
In this embodiment, the surface layer 221 and the support layer 222 are configured to have a void structure, so that the surface layer 221 and the support layer 222 can increase the specific surface area, increase the contact area between the gas and the catalyst, and improve the removal efficiency.
The composition and structure of the low-temperature composite catalyst belong to the prior art, and are not described in detail herein.
As shown in fig. 1, a sodium bicarbonate powder injection device 4 and an ammonia gas injection device 5 are connected to an air inlet pipe 1, after flue gas enters the air inlet pipe 1, sodium bicarbonate powder and ammonia gas are injected into the air inlet pipe 1 to perform deacidification and denitration reaction, the sodium bicarbonate powder is used for removing acidic gases such as SO2 and HCl in the flue gas, the ammonia gas is used for decomposing NOx under the action of a low-temperature composite catalyst, and the specific reaction formula is as follows:
the chemical equation for the deacidification reaction is:
NaHCO 3 →Na 2 CO 3 +CO 2 +H 2 O
Na 2 CO 3 +SO 2 →Na 2 SO 3 +CO 2
2Na 2 SO 3 +O 2 →2Na 2 SO 4
Na 2 CO 3 +2HCl→2NaCl+CO 2 。
the chemical equation for decomposing NOx by ammonia under the action of the low-temperature composite catalyst is as follows:
4NO+4NH 3 +O 2 →4N 2 +6H 2 O
6NO+4NH 3 →5N 2 +6H 2 O
6NO 2 +8NH 3 →7N 2 +12H 2 O
2NO 2 +4NH 3 +O 2 →3N 2 +6H 2 O。
the chemical mode of decomposition of dioxin under the action of the low-temperature composite catalyst is as follows:
C1 2 HnCl 8 -nO 2 +(9+0.5n)O 2 ＝(n-4)H 2 O+12CO 2 +(8-n)HCl。
in this embodiment, the surface layer 221 is pre-coated with a desulfurizing agent for further removing SO2 in the flue gas, and preventing the formation of sulfate on the surface of the catalyst to cover the active sites of the catalyst, which results in "poisoning" and deactivation of the catalyst.
In this embodiment, the shell 21 is made of a light-weight guard plate, and is welded completely to ensure the sealing performance of the shell 21, and meanwhile, the ash bucket 6 is disposed at the lower part of the shell 21 to receive the settled particles generated in the decomposition process.
The working principle is as follows:
after the flue gas enters the air inlet pipe 1, sodium bicarbonate powder and ammonia gas are injected into the air inlet pipe 1 through a sodium bicarbonate powder injection device 4 and an ammonia gas injection device 5, the sodium bicarbonate powder reacts with acid gases such as SO2 and HCl in the flue gas to be deacidified, the ammonia gas is used for decomposing NOx under the action of a low-temperature composite catalyst, the NOx is catalytically degraded into N2 and H2O, dioxin is decomposed into H2O, CO2 and HCl under the action of the low-temperature composite catalyst, the purification of the flue gas is completed, the purified flue gas is discharged through an outlet pipe, and particles generated by reaction fall into an ash hopper 6 to be collected.
The utility model discloses an integrated device of low temperature desorption dioxin and NOx in coordination, it is rational in infrastructure, with low costs, realized the desorption in coordination of dioxin and NOx, replace current SCR-NH 3 Denitration and dioxin removal equipment effectively simplifies a process system, reduces the occupied area and reduces the pollutant removal cost.
Claims (5)
1. The utility model provides an integrated device of low temperature desorption dioxin and NOx in coordination which characterized in that: the device comprises an air inlet pipe, a removing device and an air outlet pipe, wherein the air inlet pipe and the air outlet pipe are respectively arranged at two sides of the removing device; the removal device comprises a shell and a ceramic filter tube, wherein the ceramic filter tube is vertically arranged in the shell and comprises a surface layer and a supporting layer, the surface layer and the supporting layer are of communicated pore structures, the surface layer and the supporting layer are communicated, and a low-temperature composite catalyst for catalyzing and oxidizing dioxin and NOx is filled in the supporting layer.
2. The integrated device for the low-temperature synergic removal of dioxin and NOx as in claim 1, characterized in that: the surface layer has an average pore size of pores smaller than an average pore size of pores of the support layer.
3. The integrated device for the low-temperature synergic removal of dioxin and NOx according to claim 1, characterized in that: be connected with sodium bicarbonate powder injection apparatus and ammonia injection apparatus in the intake pipe for spray sodium bicarbonate powder and ammonia in the intake pipe, in order to carry out denitration deacidification reaction.
4. The integrated device for the low-temperature synergic removal of dioxin and NOx as in claim 1, characterized in that: a desulfurizing agent is coated on the surface layer.
5. The integrated device for the low-temperature synergic removal of dioxin and NOx according to claim 1, characterized in that: an ash bucket is arranged at the lower part of the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222359972.2U CN218307237U (en) | 2022-09-05 | 2022-09-05 | Integrated device for removing dioxin and NOx at low temperature in cooperation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222359972.2U CN218307237U (en) | 2022-09-05 | 2022-09-05 | Integrated device for removing dioxin and NOx at low temperature in cooperation |
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| Publication Number | Publication Date |
|---|---|
| CN218307237U true CN218307237U (en) | 2023-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222359972.2U Active CN218307237U (en) | 2022-09-05 | 2022-09-05 | Integrated device for removing dioxin and NOx at low temperature in cooperation |
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