CN215312415U - Catalyst combination unit - Google Patents
Catalyst combination unit Download PDFInfo
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- CN215312415U CN215312415U CN202120772822.7U CN202120772822U CN215312415U CN 215312415 U CN215312415 U CN 215312415U CN 202120772822 U CN202120772822 U CN 202120772822U CN 215312415 U CN215312415 U CN 215312415U
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Abstract
The utility model provides a catalyst combination unit, and relates to the technical field of gas treatment. The catalyst combination unit includes: at least one layer of a first denitration catalyst and at least one layer of a second denitration catalyst arranged at a prescribed interval, wherein the second denitration catalyst is different from the first denitration catalyst. According to the catalyst combination unit provided by the utility model, two different denitration catalysts are combined and arranged, and compared with the existing method of only adopting one type of catalyst, the effect complementation of different catalysts can be realized, so that the denitration efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of gas treatment, in particular to a catalyst combination unit.
Background
Along with increasingly strict environmental protection requirementsThe emission limit of nitrogen oxides (NOx) is lower and lower, and the flue gas denitration becomes a key technology for reducing the emission of the nitrogen oxides. Currently, a commonly used flue gas denitration method is a Selective Catalytic Reduction (SCR) method. In the existing SCR denitration units, only one catalyst is generally used. For example, a 3-layer vanadium-titanium based catalyst is employed in an SCR denitration unit. On the one hand, a single type of catalyst makes denitration efficiency limited, and in order to improve denitration efficiency, improvement of the catalyst (such as increase of content of vanadium active ingredient) is necessary. On the other hand, V contained in a commonly used vanadium-titanium based catalyst2O5Is a toxic material, and is easy to cause safety problems.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a catalyst assembly unit that overcomes, or at least partially solves, the above problems.
An object of the present invention is to provide a catalyst combination unit which achieves effect complementation by combining and arranging two different denitration agent catalysts, thereby improving denitration efficiency.
A further object of the present invention is to enhance the safety of the catalyst while enhancing the denitration efficiency.
In particular, according to an aspect of embodiments of the present invention, there is provided a catalyst combining unit including:
at least one layer of a first denitration catalyst and at least one layer of a second denitration catalyst arranged at a prescribed interval, the second denitration catalyst being different from the first denitration catalyst.
Optionally, the layer of the first denitration catalyst and the layer of the second denitration catalyst have different catalytic properties and water-resistant and sulfur-resistant capabilities.
Alternatively,
the first denitration catalyst layer has better high-temperature catalytic performance and better water resistance and sulfur resistance compared with the second denitration catalyst layer;
the layer of the second denitration catalyst has a better low-temperature catalytic performance than the layer of the first denitration catalyst.
Optionally, the number of layers of the first denitration catalyst is 2, and the number of layers of the second denitration catalyst is at least 1.
Alternatively, the first denitration catalyst and the second denitration catalyst are arranged in any order.
Alternatively, the first denitration catalyst and the second denitration catalyst are alternately arranged.
Optionally, the denitration catalyst combination unit further includes:
a heating element configured to heat a region where the first denitration catalyst and the second denitration catalyst are located.
The catalyst combination unit provided by the embodiment of the utility model comprises at least one layer of first denitration catalyst and at least one layer of second denitration catalyst which are arranged at intervals. Through the combination arrangement of two different denitration catalysts, compared with the existing method of only adopting one type of catalyst, the effect complementation of different catalysts can be realized, and thus the denitration efficiency is improved.
Furthermore, the catalyst combination unit provided by the utility model realizes the complementary advantages of the two catalysts by adopting the combination of the denitration catalysts with different catalytic performances and water-resistant and sulfur-resistant capabilities, so that the denitration efficiency is further improved.
Furthermore, the catalyst combination unit of the utility model adopts the arrangement combination of the vanadium-titanium-based denitration catalyst and the manganese-based denitration catalyst, thereby improving the denitration efficiency, reducing the toxicity of the catalyst and enhancing the safety of the catalyst.
Further, the catalyst composite unit of the present invention realizes a preferable catalyst composite unit that takes into account both denitration efficiency and safety by alternately arranging the vanadium-titanium-based denitration catalyst and the manganese-based denitration catalyst.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic structural view of a catalyst combining unit according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to solve the technical problem, the utility model provides a denitration catalyst combination unit.
Fig. 1 shows a schematic structural view of a catalyst assembly unit 10 according to an embodiment of the present invention. Referring to fig. 1, the catalyst-combining unit 10 of the present invention may include at least one layer of a first denitration catalyst 11 and at least one layer of a second denitration catalyst 12 arranged at a designated interval. Note that the second denitration catalyst 12 is different from the first denitration catalyst 11. The designated interval between each two layers of catalyst can be the same or different, and the specific value can be adjusted according to the actual application conditions (such as gas flow rate and the like).
In the catalyst combination unit 10 provided in the embodiment of the present invention, two different denitration catalysts are combined and arranged, and compared with the existing method that only one type of catalyst is adopted, the effect complementation of different catalysts can be realized, so that the denitration efficiency is improved.
The first denitration catalyst 11 and the second denitration catalyst 12 may have different catalytic performances and water-resistant and sulfur-resistant capabilities, thereby achieving the effect of property complementation. The combination of the denitration catalysts with different catalytic performances and water-resistant and sulfur-resistant capabilities can realize the complementary advantages of the two catalysts, and further improve the denitration efficiency.
Preferably, the first denitration catalyst 11 may have better high-temperature catalytic performance and better water-resistant and sulfur-resistant capabilities than the second denitration catalyst 12, and the second denitration catalyst 12 may have better low-temperature catalytic performance than the first denitration catalyst 11, so that good adaptability of the integrated catalyst combination unit 10 to temperature, water and sulfur can be achieved.
In a preferred embodiment, the first denitration catalyst 11 may be a vanadium-titanium-based denitration catalyst. The vanadium-titanium-based denitration catalyst in the present embodiment may be a vanadium-titanium-based denitration catalyst commonly used in the art, which is generally TiO2As a carrier, V2O5Other active auxiliary components, such as oxides of Mo, Zr, Cu, Cr, rare earth, etc. can also be contained as the main active component.
The second denitration catalyst 12 may be a manganese-based denitration catalyst. The manganese-based denitration catalyst used in the present embodiment may be supported (e.g., as anatase TiO)2Honeycomb ceramics, etc.) may be unsupported. The manganese active component in the manganese-based denitration catalyst may be divalent manganese and/or tetravalent manganese, i.e., MnO and/or MnO2. Of course, when both divalent and tetravalent manganese are present, the manganese active component may also be Mn2O3The form of (1). In order to ensure the denitration efficiency, the mass content of the manganese active component in the manganese-based denitration catalyst can be in the range of 8-12%, for example, 9%, 10%, 11%, etc. Preferably, the mass content of the manganese active component in the manganese-based denitration catalyst is 10%, so that the better balance between the catalyst cost and the denitration efficiency can be achieved.
Further, the manganese-based denitration catalyst may further contain other active assistant components, such as oxides of Fe, Co, Ce, and the like. The content ratio of these active assistant components can be adjusted according to the desired catalytic auxiliary effect, and the present invention is not particularly limited thereto.
Of course, any conventional manganese-based denitration catalyst may be used in the present invention.
As is well known, V2O5Is a toxic material, which can cause acute poisoning and chronic poisoning and has damage effect on the respiratory system and skin of human body. And MnO2The toxicity of (b) is relatively low. In this embodiment, by adopting the arrangement and combination of the vanadium-titanium-based denitration catalyst and the manganese-based denitration catalyst, the denitration efficiency is improved, the toxicity of the catalyst is reduced, and the safety of the catalyst is enhanced.
In some embodiments, the first denitration catalyst 11 and the second denitration catalyst 12 may be arranged in any order. In other embodiments, the first denitration catalyst 11 and the second denitration catalyst 12 may be arranged regularly, preferably alternately.
In a specific embodiment, the catalyst combining unit 10 may include 2 layers of the first denitration catalyst 11 and at least 1 layer of the second denitration catalyst 12. So set up and to reach and guarantee denitration efficiency as far as possible on the basis of not increasing the cost by a large amount.
Taking 2 layers of the first denitration catalyst 11 and 1 layer of the second denitration catalyst 12 as an example, the first denitration catalyst 11 and the second denitration catalyst 12 may be arranged in any order, for example, starting from the direction of the gas flow, the first denitration catalyst 11, the second denitration catalyst 12 may be arranged in the order, or the second denitration catalyst 12, the first denitration catalyst 11, the second denitration catalyst 12 may be arranged in the order, or the like.
Preferably, the first denitration catalyst 11 and the second denitration catalyst 12 are alternately arranged. Specifically, the first denitration catalyst 11, the second denitration catalyst 12, and the first denitration catalyst 11 are arranged in this order starting from the direction in which the gas flows. In particular, in the case where the first denitration catalyst 11 is a vanadium-titanium-based denitration catalyst and the second denitration catalyst 12 is a manganese-based denitration catalyst, the vanadium-titanium-based denitration catalyst, the manganese-based denitration catalyst, and the vanadium-titanium-based denitration catalyst are arranged in this order.
In this embodiment, the preferable catalyst combination unit 10 that gives consideration to both the denitration efficiency and the denitration safety is realized by alternately arranging the vanadium-titanium-based denitration catalyst and the manganese-based denitration catalyst. Experimental data show that the denitration efficiency (i.e. the NO removal rate) of gas treatment can reach 60-90% under the catalysis of the denitration catalyst combination unit 10.
During the denitration treatment, the denitration catalyst is often deactivated due to deposits thereon or poisoning, etc., so that the catalytic ability is lowered. Meanwhile, the temperature is also a large factor affecting the catalytic effect of the denitration catalyst. In one embodiment of the present invention, the catalyst assembly unit 10 may further include a heating element 13. The heating element 13 may be disposed in the vicinity or around the first and second denitration catalysts 11 and 12 and placed between the first and second denitration catalysts 11 and 12 to heat the region where the first and second denitration catalysts 11 and 12 are located. By the heating of the heating element 13, on the one hand, the temperature of the gas reaction in the region of the first denitration catalyst 11 and the second denitration catalyst 12 can be controlled to promote the NO conversion reaction; on the other hand, the catalyst can be used for promoting the decomposition of deposits on the catalyst and recovering the activity of the catalyst so as to regenerate the catalyst. The heating element 13 may be a heat exchange type heating element (such as a heat exchanger, etc.), or may be a direct heating type heating element, such as a resistance heating wire, etc., and the present invention is not limited to the specific form of the heating element 13.
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
The catalyst combination unit in this example 1 was composed of 2 layers of the first denitration catalyst and 1 layer of the second denitration catalyst alternately arranged. The first denitration catalyst is a commercial vanadium-based SCR denitration catalyst Dinoes. The second denitration catalyst is a supported manganese-based denitration catalyst, and the component MnO of the second denitration catalyst2：TiO2：Fe2O3：Co2O3The mass ratio of (A) to (B) is 10: 80: 6: 4.
comparative example
The catalyst assembly unit in the comparative example consisted of 3 layers of the commercial vanadium-based SCR denitration catalyst dinones.
In order to further embody the advantageous effects of the present invention, the denitration effects of example 1 and the comparative example were respectively tested. The specific test method comprises the following steps: adding NOxThe content is 100mg/m3In 7000m3The denitration efficiency was measured at 140 deg.C, 170 deg.C, and 200 deg.C, respectively, by passing the catalyst combination unit at a flow rate of 600L/h, and the results are shown in Table 1 below.
Table 1 denitration efficiency test results of example 1 and comparative example
The experimental result shows that compared with the method of only adopting a single vanadium-titanium-based denitration catalyst, the catalyst combination unit provided by the embodiment of the utility model can realize the effect complementation of different catalysts and improve the denitration efficiency. In addition, the dosage of the toxic vanadium-titanium based denitration catalyst is reduced, so that the safety and the environment-friendly property are improved.
According to any one or a combination of multiple optional embodiments, the embodiment of the present invention can achieve the following advantages:
the catalyst combination unit provided by the embodiment of the utility model comprises at least one layer of first denitration catalyst and at least one layer of second denitration catalyst which are arranged at intervals. Through the combination arrangement of two different denitration catalysts, compared with the existing method of only adopting one type of catalyst, the effect complementation of different catalysts can be realized, and thus the denitration efficiency is improved.
Furthermore, the catalyst combination unit provided by the utility model realizes the complementary advantages of the two catalysts by adopting the combination of the denitration catalysts with different catalytic performances and water-resistant and sulfur-resistant capabilities, so that the denitration efficiency is further improved.
Furthermore, the catalyst combination unit of the utility model adopts the arrangement combination of the vanadium-titanium-based denitration catalyst and the manganese-based denitration catalyst, thereby improving the denitration efficiency, reducing the toxicity of the catalyst and enhancing the safety of the catalyst.
Further, the catalyst composite unit of the present invention realizes a preferable catalyst composite unit that takes into account both denitration efficiency and safety by alternately arranging the vanadium-titanium-based denitration catalyst and the manganese-based denitration catalyst.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the utility model may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the utility model have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the utility model may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the utility model. Accordingly, the scope of the utility model should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. A catalyst assembly unit, comprising:
at least one layer of a first denitration catalyst and at least one layer of a second denitration catalyst arranged at a prescribed interval, the second denitration catalyst being different from the first denitration catalyst.
2. The catalyst combination unit according to claim 1,
the first denitration catalyst layer and the second denitration catalyst layer have different catalytic performances and water resistance and sulfur resistance.
3. The catalyst combination unit according to claim 2,
the first denitration catalyst layer has better high-temperature catalytic performance and better water resistance and sulfur resistance compared with the second denitration catalyst layer;
the layer of the second denitration catalyst has a better low-temperature catalytic performance than the layer of the first denitration catalyst.
4. The catalyst combination unit according to any one of claims 1 to 3,
the number of layers of the first denitration catalyst is 2, and the number of layers of the second denitration catalyst is at least 1.
5. The catalyst combination unit according to claim 4,
the first denitration catalyst and the second denitration catalyst are arranged in an arbitrary order.
6. The catalyst combination unit according to claim 5,
the first denitration catalyst and the second denitration catalyst are alternately arranged.
7. The catalyst combination unit of claim 1, further comprising:
a heating element configured to heat a region where the first denitration catalyst and the second denitration catalyst are located.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115212889A (en) * | 2021-04-15 | 2022-10-21 | 北京绿岸壹号能源科技有限公司 | Catalyst combination unit |
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