WO2017200114A1

WO2017200114A1 - Metal foam scr catalyst module for exhaust gas denitration

Info

Publication number: WO2017200114A1
Application number: PCT/KR2016/005184
Authority: WO
Inventors: 박해경
Original assignee: 한서대학교 산학협력단
Priority date: 2016-05-16
Filing date: 2016-05-17
Publication date: 2017-11-23
Also published as: KR101762573B1

Abstract

The present invention relates to a metal foam SCR catalyst module for exhaust gas denitration and, more particularly, to a metal foam SCR catalyst module for exhaust gas denitration, having first and second metal foams arranged at appropriate intervals and predetermined slopes, and a third metal foam horizontally arranged on upper parts of the first and second metal foams, such that an increase in back pressure can be minimized while the reaction surface area per unit volume is maximally increased, thereby enabling removal efficiency of the nitrogen compound to be maximized.

Description

Metal Foam Sc Catalyst Module for Flue Gas Denitrification

The present invention relates to a metal foam SCR catalyst module for flue gas denitrification, and more particularly, to a metal foam SCR catalyst module for flue gas denitrification that can maximize the removal efficiency of nitrogen compounds while minimizing the increase in back pressure.

A nitrogen oxide (NOx) main cause of air pollution incinerators, power stations and as contaminants outbreak in anchorage of the boiler or the like, by reacting a reducing agent of NH ₃ and NOx in order to process it was converted to N ₂ and H ₂ O Selective Catalytic Reduction (SCR) is economical and has high removal efficiency.

Conventional catalysts for nitrogen oxide removal by the selective catalytic reduction method include three types of extruded honeycomb type catalysts, corrugated type catalysts, and plate type catalysts. Most widely applied.

However, extruded honeycomb type catalysts have the advantages of excellent thermal stability and wide pores due to the development of pores, whereas they are extruded into a honeycomb form by mixing all of the expensive catalyst materials with the binder, resulting in uneconomical processes. In addition, since the mechanical strength is relatively low, frequent breakage occurs during operation, and frequent replacement is inevitable. In addition, although the corrugated type catalyst is light, there is a possibility of a fire occurrence due to the characteristics of the support material, and there is an actual case in a domestic application facility, and a plate type catalyst is applied to coal fired power only. .

Therefore, in order to make up for the shortcomings of the conventional commercial catalysts, a support called metal foam, which is a metal support having a wide range of application, excellent mechanical strength, high thermal conductivity, and high specific surface area, is attracting attention as a new type of catalyst. have. Metal foam is also called a foamed metal, and refers to a metal having a plurality of pores.

Since the metal foam is formed of a mixed structure of a plurality of fine pores, not only has a high specific surface area, but also has light weight, energy absorption, heat insulation, and fire resistance, and can be used at high temperatures compared to the porous material of ceramic or organic polymer materials. Since it is tough and has properties that can be recycled as a metal, it can reduce environmental problems.

The practical application of an SCR catalyst to a nitrogen oxides installation requires an optimal module design that allows the catalyst to be arranged to minimize back pressure increase with good NOx removal as the catalyst itself. In addition, since the existing space for mounting the SCR catalyst is small and additional space is not easily secured, it is a general situation that the installation of all the catalysts required to achieve the NOx target conversion rate is entailed.

Accordingly, in Korean Patent No. 1485082, a metal foam having a reaction point of a three-dimensional structure without increasing the back pressure to minimize the volume and weight by allowing the reaction surface area per unit volume in which NH ₃ and NOx can react to the maximum is minimized. A catalyst carrier is shown.

However, the catalyst carrier for selective catalytic reduction of the patent document uses a metal foam having the advantage of minimizing the catalyst volume than the conventional catalyst because the reaction surface area per unit volume is wide, but the exhaust gas flow catalyst Since the module is designed to be substantially parallel to the exhaust gas, the exhaust gas passes into the space between the catalyst and the catalyst without contact with the catalyst, thereby failing to maximize the catalyst performance. In addition, this module type is a problem due to the increase in the amount of catalyst required to achieve the target NOx conversion rate and the constraints due to the narrow installation space.

The main object of the present invention is to solve the above-mentioned problems, metal foam SCR catalyst module for flue gas denitrification that can maximize the removal efficiency of nitrogen compounds by minimizing the increase in back pressure while maximally increasing the catalytic reaction surface area in contact with the exhaust gas To provide.

In order to achieve the above object, an embodiment of the present invention has a base member having a constant size and shape, forming a base; A planar first metal foam arranged on one surface of the base member at predetermined intervals with a predetermined slope; A planar second metal foam arranged between the first metal foam and the neighboring first metal foam and arranged at regular intervals at predetermined intervals so as to meet one end of the first metal foam and the other end of the neighboring first metal foam; ; And a planar third metal foam disposed horizontally on the first metal foam and the second metal foam, wherein the protruding peaks or valleys formed in a region where the first metal foam and the second metal foam meet each other are in a width direction. It provides a metal foam SCR catalyst module for flue gas denitrification, characterized in that it is formed repeatedly.

In a preferred embodiment of the present invention, the first metal foam may be disposed in parallel with the neighboring first metal foam, the second metal foam may be disposed in parallel with the neighboring second metal foam. .

In a preferred embodiment of the present invention, the inner angle (α) between the first metal foam and the base member one surface is 78 ~ 88 °, the inner angle (β) between the second metal foam and the base member one surface is 78 ~ 88 ° It can be characterized by.

In a preferred embodiment of the present invention, the thickness of the first to third metal foam may be characterized in that 4 mm ~ 5 mm.

In a preferred embodiment of the present invention, the first to the third metal foam may be characterized in that at least one selected from the group consisting of Ni-based metal foam, Ni-Fe-based metal foam and FeNiCrAl-based metal foam.

In a preferred embodiment of the present invention, the first to third metal foam is one or more selected from the group consisting of V ₂ O ₅ , WO ₃ , MoO ₃ , Sb ₂ O ₃ and TiO ₂ as selective reduction catalyst powder It may be characterized in that the powder is coated.

The metal foam SCR catalyst module for flue gas denitrification according to the present invention may arrange the first and second metal foams at an appropriate interval and a predetermined inclination, and the third metal foam may be disposed horizontally on top of the first and second metal foams. In this way, the increase in back pressure can be minimized while maximally increasing the reaction surface area per unit volume in contact with the exhaust gas, thereby maximizing the removal efficiency of the nitrogen compound.

1 is a front view of a metal foam SCR catalyst module for flue gas denitrification according to an embodiment of the present invention.

2 is a front view of a metal foam SCR catalyst module for flue gas denitrification according to another embodiment of the present invention, (a) is a front view of a catalyst module in which first to third metal foams are repeatedly stacked on one base member, (b) is a front view of a catalyst module in which two base members having first to third metal foams are repeatedly stacked.

3 is a perspective view of a metal foam SCR catalyst module for flue gas denitrification according to an embodiment of the present invention.

100: base member

110: first metal foam

120: second metal foam

130: third metal foam

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein is well known and commonly used in the art.

Throughout this specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding the other components unless otherwise stated.

The present invention has a base member having a constant size and shape and forming a base; A planar first metal foam arranged on one surface of the base member at predetermined intervals with a predetermined slope; A planar second metal foam arranged between the first metal foam and the neighboring first metal foam and arranged at regular intervals at predetermined intervals so as to meet one end of the first metal foam and the other end of the neighboring first metal foam; ; And a planar third metal foam disposed horizontally on the first metal foam and the second metal foam, wherein the protruding peaks or valleys formed in a region where the first metal foam and the second metal foam meet each other are in a width direction. It relates to a metal foam SCR catalyst module for flue gas denitrification, characterized in that formed repeatedly.

More specifically, the flue gas denitrification metal foam SCR catalyst module according to the present invention arranges the first and second metal foams at an appropriate interval and a predetermined slope, and the third metal foam is formed on top of the first and second metal foams. By placing them horizontally, the increase in back pressure can be minimized while maximally increasing the reaction surface area per unit volume.

Hereinafter, the present invention will be described in detail with the accompanying drawings.

1 is a front view of a metal foam SCR catalyst module for flue gas denitrification according to an embodiment of the present invention, FIG. 2 is a front view of a metal foam SCR catalyst module for flue gas denitrification according to another embodiment of the present invention, and FIG. A perspective view of a metal foam SCR catalyst module for flue gas denitrification according to an embodiment of the present invention.

As shown in Figures 1 to 3, the flue gas denitrification metal foam SCR catalyst module according to the present invention is the base member 100, the first metal foam 110, the second metal foam 120 and the third metal foam ( 130).

The base member 100 serves to accommodate the first to

third metal foams

110, 120, and 130, and may be made of metal, ceramic, plastic, or the like.

The base member 100 may be formed in a hexahedral shape having a predetermined size and shape, and the lower surface and the upper surface in one direction may be opened for inflow and outflow of fluid (exhaust gas, etc.). The base member may be manufactured integrally, may be divided into a plurality, and the size may be appropriately adjusted to correspond to the flue gas denitrification device.

In the present invention, the first to the third metal foam (110, 120, 130) is a catalyst carrier (support) supporting the active ingredient, the material is relatively light, and suitable for high pressure, high heat exhaust gas directly Ni-based metal foams, NIFe-based metal foams, FeNiCrAl-based metal foams and the like in terms of the deformation does not occur even if transmitted.

The manufacturing method of the first to third metal foams is general, and a detailed description thereof will be omitted.

The first to third metal foams have a predetermined thickness in a plate shape, and the first to third metal foams may have the same or different sizes, and preferably the first to second metal foams have a size. Is the same, the third metal foam may be the same size or different from the first to the second metal foam.

In addition, each of the first to third metal foam can be applied to a metal foam of various thickness, it is preferable that the thickness of 4 mm to 5 mm in terms of increased back pressure and installation space.

On the other hand, as an active ingredient supported on the first to third metal foam (110, 120, 130), any component that can be applied to flue gas denitrification can be supported without limitation, for example, V ₂ O as a selective reduction catalyst powder ₅ , WO ₃ , MoO ₃ , SbO ₃ , TiO ₂ , and the like, and their supporting content can be adjusted according to denitrification conditions.

The number of the first to third metal foams is not particularly limited and may vary depending on the exhaust gas throughput, the NOx target conversion rate, the size of the base member 100, and the size of the flue gas denitrification apparatus.

The first to third metal foams (110, 120, 130) can improve the adhesion of the catalyst when coating the catalyst to the uneven surface of the geometric shape, has a complex three-dimensional flow path has a number of contact between the fluid and the catalyst There is a characteristic that causes it to be increased.

A plurality of such first metal foams 110 are planarly arranged on one surface of the base member 100 at predetermined intervals with a predetermined slope. In this case, as shown in FIG. 1, the first metal foam 110 ′ is disposed in parallel with the neighboring first metal foam 110 ″, and an inner angle α between one surface of the base member 100 and each of the first metal foam 110 ′ is disposed. It is independently inclined to 78 ° to 88 °, preferably 80 ° to 88 °, and arranged on one surface of the base member.

At this time, when the inner angle (α) between the first metal foam 110 and one surface of the base member is less than 78 °, the amount of exhaust gas passing per catalyst unit cross-sectional area is increased to increase the back pressure may occur, 88 ° If it exceeds the cross-sectional area in contact with the exhaust gas flow may be a problem that the NOx removal efficiency is reduced.

In addition, the first metal foam 110 may be arranged to be bent at a predetermined slope so that the cross-section is 'V' shaped so that one surface of the first metal foam 110 serves as a second metal foam to be described later. In this case, the bending to the predetermined slope may be bent so that the inner angle (α, β) between one surface of the base member is 78 ~ 88 °.

On the other hand, the second metal foam is in the same planar shape as the first metal foam, and is arranged between the first metal foam 110 ′ and the neighboring first metal foam 110 ″, and the first metal foam 110 ′. An acid 140 which is arranged at a predetermined interval so as to meet one end and the other end of the first metal foam 110 ″ that is adjacent, and protrudes in an area where the first metal foam and the second metal foam meet each other, and / Or the valley 150 is formed repeatedly in the width direction.

The second metal foam 120 ′ may be disposed in parallel with the neighboring second metal foam 120 ″, and an inner angle β between one surface of the base member and each of the second metal foam 120 ′ may be 78 ° to 88 ° independently. If the internal angle β between the second metal foam 120 and one surface of the base member is less than 78 °, the amount of exhaust gas passing per unit cross-sectional area of the catalyst may increase, resulting in an increase in back pressure. If it exceeds the cross-sectional area in contact with the exhaust gas flow may be a problem that the NOx removal efficiency is reduced.

The third metal foam 130 is planar, such as first and second metal foams, and may be disposed at least one horizontally on the first metal foam and the second metal foam, and the number thereof is to be processed. Although it can be adjusted according to denitrification conditions, it is preferable to arrange | position at least since 3rd metal foam has a critical influence on back pressure increase.

In this case, the first to third metal foams may be attached and fixed to the base member or each metal foam by a method such as adhesion, welding, or fixing members.

In addition, the metal foam SCR catalyst module for flue gas denitrification according to the present invention may be repeatedly arranged in the same manner as the first to third metal foams on the third metal foam in the same manner as shown in FIG. The base member on which the third metal foam is disposed may be repeatedly laminated (FIG. 2B) or horizontally arranged.

The metal foam SCR catalyst module for flue gas denitrification according to the present invention arranges the first and second metal foams at an appropriate interval and a predetermined inclination, and simultaneously arranges the third metal foam horizontally on the first and second metal foams. By placing, the back pressure increase can be minimized while maximally increasing the reaction surface area per unit volume.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only intended to illustrate the invention, and the scope of the invention should not be construed as being limited by these examples.

<실시예 1 및 2><Examples 1 and 2>

In the flue gas denitrification metal foam SCR catalyst module according to the present invention, the base member is manufactured in a size of 150 × 150 × 600 mm (length / width / height), and the first to third metal foams are produced by A company in Korea. The Ni-based metal foam was cut into 150 × 150 × 5 mm (length / width / thickness), and the catalyst active ingredient was prepared as a slurry of V ₂ O ₅ -WO ₃ / TiO ₂ . The metal foam SCR catalyst was prepared by coding 150 g / L on the metal foam. The thus prepared SCR catalyst was arranged on the base member to form a catalyst module as shown in FIG. 1, and then the first and second metal foam cabinets α and β were changed to the conditions shown in Table 1, and the third metal The foam was placed in the same single layer in each case and then the pressure loss and NOx conversion for the catalyst module were measured and the results are shown in Table 1.

At this time, the pressure loss was measured by using a pressure gauge before and after passing through the catalyst module, the NOx conversion rate of the catalyst using a gas analyzer (Greenline 9000) under the conditions of space velocity 64,800hr ^-1 , reaction temperature 270 ℃ NOx concentrations were measured and converted before and after passing through the module.

Table 1

division	Example 1	Example 2	Comparative Example 1	Comparative Example 2
1st Metal Foam Cabinet (°)	85	80	90	75
Second Metal Foam Cabinet (°)	85	80	90	75
Pressure loss (mmH ₂ O)	28	32	21	53
NOx conversion rate (%)	85	87	74	90

As shown in Table 1, Examples 1 and 2 was found to be superior to the NOx removal efficiency while minimizing pressure loss compared to Comparative Examples 1 and 2, the pressure according to the change in the cabinet of the first metal foam and the second metal foam Loss and NOx conversions tended to change oppositely. In Comparative Example 1 in which the exhaust gas flow and the catalyst cross-section were arranged in parallel, the pressure loss and the NOx conversion were lowest, whereas in Comparative Example 2 having the smallest cabinet, the pressure loss and the NOx conversion were measured the highest. When the cabinets of the first metal foam and the second metal foam were arranged in the sizes of Examples 1 and 2, it was confirmed that the pressure loss and the NOx conversion rate can be adjusted to an appropriate range.

Therefore, it was confirmed that the metal foam SCR catalyst module for flue gas denitrification according to the present invention can minimize the back pressure increase while maximally increasing the reaction surface area per unit volume, thereby maximizing the removal efficiency of the nitrogen compound.

All simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims

A base member having a constant size and shape and forming a base;

A planar first metal foam arranged on one surface of the base member at predetermined intervals with a predetermined slope;

A planar second metal foam arranged between the first metal foam and the neighboring first metal foam and arranged at regular intervals at predetermined intervals so as to meet one end of the first metal foam and the other end of the neighboring first metal foam; ; And

A planar third metal foam disposed horizontally on the first metal foam and the second metal foam;

Flue gas denitrification metal foam SCR catalyst module, characterized in that the protruding acid or valley formed in the region where the first metal foam and the second metal foam meets in the width direction.
The method of claim 1,

The metal foam SCR catalyst module for flue gas denitrification, wherein the first metal foam is disposed in parallel with a neighboring first metal foam, and the second metal foam is disposed in parallel with a neighboring second metal foam.
The method of claim 2,

The inner angle α between the first metal foam and one surface of the base member is 78 to 88 °, and the inner angle β between the second metal foam and one surface of the base member is 78 to 88 °. Foam SCR Catalyst Module.
The method of claim 1,

The thickness of the first to third metal foam is a metal foam SCR catalyst module for flue gas denitrification, characterized in that 4 mm ~ 5 mm.
The method of claim 1,

The first to third metal foam is a metal foam SCR catalyst module for flue gas denitrification, characterized in that at least one selected from the group consisting of Ni-based metal foam, Ni-Fe-based metal foam and FeNiCrAl-based metal foam.
The method of claim 1,

The first to third metal foams are coated with at least one powder selected from the group consisting of V 2 O 5 , WO 3 , MoO 3 , Sb 2 O 3 and TiO 2 as selective reduction catalyst powders. Metal foam SCR catalyst module for flue gas denitrification.