CN211837942U

CN211837942U - Improved clover-shaped mercury removal agent

Info

Publication number: CN211837942U
Application number: CN202020103990.2U
Authority: CN
Inventors: 赵少丹; 许龙龙; 金义; 王文幼
Original assignee: Xian Sunward Aerospace Material Co Ltd
Current assignee: Xian Sunward Aerospace Material Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-11-03
Anticipated expiration: 2030-01-17

Abstract

The utility model discloses a clover form demercuration agent of improvement, cross section are the clover form that has the circular arc recess of axial symmetry, and the cross section of three blade is two liang of circumscribed interior circles mutually, and three interior circles circumscribed simultaneously and an excircle, the utility model discloses the demercuration agent specific surface area of the three clover form demercuration agent of well improvement than traditional three clover form is big, bulk density is low, anti crushing power is strong, and mercury capacity is high, can be better satisfy the operation requirement to each performance index of catalyst in the industry.

Description

Improved clover-shaped mercury removal agent

Technical Field

The utility model relates to a natural gas demercuration field, concretely relates to clover form demercuration agent of improvement.

Background

Mercury and its compounds have high toxicity, volatility, corrosiveness, and can cause significant impact on process equipment, environment, and human health, and the harm of mercury has attracted extensive attention all over the world. The natural gas is subjected to demercuration treatment before use, so that the harm of mercury to human bodies and the pollution to the environment are reduced, and metal sulfide is known to be the most obvious catalyst for demercuration at present according to relevant documents. The basic principle of mercury removal is that mercury in natural gas reacts with certain metal sulfides to form mercury sulfide with extremely stable chemical properties, so that the purpose of mercury removal is achieved.

The catalyst plays an important role in chemical reaction, has certain morphology, has different requirements on the aspects of specific surface area, pore volume, strength, mass transfer, fluid distribution and the like along with different use purposes in the industry, and researches show that different appearance morphologies can influence the use performance of the catalyst in the industry.

The appearance of the traditional catalyst is cylindrical, Raschig ring, honeycomb briquette, spherical and wheel-shaped, and the clover-shaped catalyst is the most widely applied one in the field of catalysis in recent years;

the clover shape reduces the diameter of the catalyst to a certain extent, so that the mechanical strength is enhanced, the void ratio is increased, and the bulk density is reduced. However, the prior art is only described by the clover shape, and is not specifically applied to a certain catalyst, and a specific data index of the performance of the certain catalyst is not used for supporting, so that the prior art still has room for further research. Meanwhile, the appearance of the cloverleaf-shaped catalyst can be further improved, so that the cloverleaf-shaped catalyst can better meet the use requirements of high specific surface area, low bulk density, high activity and the like of the catalyst in industry.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an improved clover-shaped mercury removing agent with high specific surface area, low bulk density and high activity.

The purpose of the utility model is realized through the following technical scheme:

the cross section of the improved clover-shaped mercury removing agent is in an axisymmetric clover shape, the cross sections of three blades are inner circles which are externally tangent in pairs, the three inner circles are externally tangent with an outer circle simultaneously, the outer wall of each inner circle is provided with an arc groove along the axial direction, and the distances from the circle center of the circle where the three arc grooves are located to the center of the outer circle are the same.

Furthermore, the circle center of the circle where the arc groove is located is the tangent point of the three inner circles and the outer circle.

Further, the diameter d of the circle where the arc groove is located₂Less than or equal to the inner circle radius.

Further, the diameter d of the inner circle₁0.4641 times the diameter D of the outer circle.

Furthermore, the diameter d of the circle where the arc groove is located on the cross section₂Which is 0.2321 times the diameter D of the outer circle.

Further, the length L of the mercury removing agent is 5-15 mm.

Further, the diameter d of the inner circle₁Is 1-3 mm.

Furthermore, the structure is a solid structure formed by extruding mixed materials.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses an offer the circular arc recess that extends along demercuration agent axial on the demercuration agent outer wall that the cross section is cloverleaf shape, increased the area of contact of demercuration agent surface reaction, make the demercuration agent have high specific surface area and high activity, the arc recess is offered to the demercuration agent outer wall, provides the gaseous phase diffusion passageway when the demercuration agent piles up in a large number, helps reducing gaseous phase diffusion distance, accelerates the gas-solid reaction rate, more is favorable to the demercuration reaction to go on; simultaneously, because take off the mercury agent surface and set up the recess for when taking off the mercury agent and piling up in a large number, take off the mercury agent quality lighter, the utility model discloses have lower bulk density, radial crushing resistance intensity is high, has reduced and has taken off mercury agent crushing phenomenon, has reduced the raw materials cost, accords with the requirement to the catalyst in the industry more.

The circle center of the circle where the arc groove is located is the tangent point of the three inner circles and the outer circle, and the diameter d of the circle where the arc groove is located₂Less than or equal to the inner circle diameter d₁The guarantee that the stacking quality is reduced and the reaction area is enlarged by arranging the grooves does not influence the strength of the reaction plate, and the method is more suitable for industrial production.

Drawings

FIG. 1 is a schematic view of the overall structure of the improved clover-shaped mercury remover of the present invention;

FIG. 2 is a schematic cross-sectional view of a modified clover-shaped demercuration agent of the present invention;

FIG. 3 is a schematic cross-sectional view of the mold of the present invention;

in the figure: l-demercuration agent length; d-the diameter of the excircle; d₁-an inner circle diameter; d₂The diameter of the circle on which the circular arc groove is located.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 and 2, the utility model discloses the clover form demercuration agent of improvement, its cross section is axisymmetric clover shape, the cross section of three blade is two liang of circumscribed interior circles, and three interior circles simultaneously circumscribed with an excircle, circular arc recess has been seted up along the axial on every interior circle outer wall, the centre of a circle of three circular arc recess place circle is the same to excircle central distance, the centre of a circle of circular arc recess place circle is the tangent point of three interior circle and excircle, circular arc recess position symmetry and shape are the same, make each angle of demercuration agent unanimous with direction intensity.

The surface area is increased, the stacking density is reduced when a large amount of mercury removing agent is stacked, the strength of the mercury removing agent of the monomer is not influenced, and the diameter d of the circle where the arc groove is located₂Should be less than or equal to the inner circle radius.

The improved clover-shaped mercury removing agent of the utility model has the following preparation process:

step 1, weighing a certain proportion of pseudo-boehmite, precipitated copper sulfide, water and an auxiliary agent, and mixing to obtain an extrusion mixed material;

step 2, preparing a mold: making a corresponding small extrusion die according to the axisymmetric clover shape with arc grooves shown in FIG. 2, wherein the clover shape in FIG. 2 is formed by three clover shapes with the diameter d₁Inner circles ofFormed by exo-excision, preferably d₁1-3 mm, the diameter of the outer circle of the clover is D, D₁0.4641 times of D, the diameters of the circles of the arc grooves are D₂And two end points of the arc groove are intersected with the outer circle of the clover shape, d₂Preferably 0.2321 times of D, the manufactured mould is as shown in figure 3, the plane of the mould is at least provided with a clover-shaped opening, so that the mould can be replaced according to the actual production requirement, and the production efficiency is improved;

and 3, extruding the solid extruded mixture on a die to obtain the improved clover-shaped mercury removal agent product shown in the figure 1, wherein the length L of the product is controlled to be 5-15 mm, and drying at 50 ℃ to obtain the improved finished clover-shaped mercury removal agent.

Finally, the bulk density of the finished improved clover-shaped mercury removing agent is determined to be 0.43g/mL, the average value of the radial crushing resistance is 98N/cm, and the specific surface area is 180m²The mercury capacity is 13-19%, the improved clover-shaped mercury removal agent has large specific surface area and high mercury capacity, can better accelerate the reaction rate of the mercury removal reaction, and has high activity; and the bulk density of conventional clover form catalyst granule is 0.51g/mL, intensity 35N/cm, the utility model discloses an improved clover form demercuration agent bulk density is little, and mechanical strength is high, and anti crushing power is strong, accords with the operation requirement to the catalyst in the industry more.

Claims

1. The improved clover-shaped mercury removing agent is characterized in that the cross section of the mercury removing agent is in an axisymmetric clover shape, the cross sections of three blades are inner circles which are externally tangent in pairs, the three inner circles are externally tangent with an outer circle at the same time, an arc groove is axially formed in the outer wall of each inner circle, and the distances from the circle center of the circle where the three arc grooves are located to the center of the outer circle are the same.

2. The improved clover-shaped mercury removing agent as claimed in claim 1, wherein the circle center of the circle with the arc groove is the tangent point of three inner circles and outer circles.

3. The method of claim 2The improved clover-shaped mercury removing agent is characterized in that the diameter d of the circle where the arc groove is located₂Less than or equal to the inner circle radius.

4. The improved trilobe mercury remover as claimed in claim 3, wherein said inner circle diameter d₁0.4641 times the diameter D of the outer circle.

5. The improved clover-shaped mercury removing agent according to claim 3, wherein the circular arc groove on the cross section is located on the circle diameter d₂Which is 0.2321 times the diameter D of the outer circle.

6. An improved trilobe-shaped mercury remover according to any one of claims 1-5, characterized in that the length L of the remover is 5-15 mm.

7. The improved trilobe mercury removal agent of claim 6, wherein said inner circle diameter d₁Is 1-3 mm.

8. An improved trilobe-shaped mercury remover as claimed in claim 7, characterized by a solid core structure made by extrusion of the mixed materials.