Nested protective agent proppant

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Nested protective agent proppant

The neoprotectant (proppant) is a new environmentally friendly and energy-saving product that can completely replace porcelain balls and open porcelain balls.Products mainly to high-purity alumina and pseudo-boehmite as raw materials, firing at high temperature,It has the advantages of high strength, high specific surface area and high porosity, which can effectively load the weight of other beds in the reaction tower.Due to its unique dense mesh structure and larger specific surface area, the gas and liquid flowing through the finely-cut can be maximally cut so that the contact and heat exchange between the cold hydrogen and the feedstock oil are more sufficient. After entering the main catalyst bed Layer distribution more evenly.Nested protective agent (proppant) products much larger porosity than the porcelain ball,Unique arc surface design, making any contact in the form of points or lines to improve the effective rate of sewage further to improve the horizontal distribution of gas and liquid, the porosity increased to more than 80%,So that the flow of gas and liquid through the reactor cover and support layer when the flow rate is slower, so mix and mix more fully and effectively reduce the bed pressure drop.Therefore, the neoprotector (proppant) products have the incomparable advantages of ceramic balls,The entire operation of the device, no matter from the energy saving and running time have absolute advantage.

According to user requirements to produce different aluminum content (20-80%) of the products,At the same time the product has various types of ceramic ball corresponding to, including: Φ3mm, Φ6mm, Φ10mm, Φ13mm, Φ16mm, Φ19mm and so on.

At present, the proppant of the catalyst in the fixed bed reactor in the country mainly consists of porcelain balls.Although the ceramic ball with high strength, good acid and alkali resistance characteristics,However, they have the following drawbacks: due to the limitation of the structure of the ceramic ball itself, the porosity is low, the specific surface area is small and coking is liable to cause the pressure drop in the fixed bed reactor to be excessive and the temperature is too high, thereby increasing the flow resistance of the reactant and decreasing The effective contact reactants frequency, thus affecting the efficiency of the fixed bed reactor.

 

Nested protective agent proppant role and advantages

  • reduce pressure drop

Nested protective agent (proppant) has a huge porosity and bed cross-sectional opening area, 80% -100% higher than the ball, which creates great conditions for reducing pressure drop. In particular, the longer the running time, the more impurities accumulate, the better the performance of the nested protective agent (proppant). Than the traditional ceramic ball, can reduce the pressure drop 40-50%.

 

  • reduce the pressure difference and more evenly distributed

    Nested protective agent (proppant) from the bottom of the bed support cross-section, the opening area is 1.5-2.5 times the ceramic ball, the ceramic ball pressure difference than the nest protective agent (proppant) is much more uneven. Strong pressure and uneven distribution of the reaction will lead to uneven reaction over the formation of carbon sink and coking, and shorten the life of the catalyst.

  • Improve compressive strength and distribution more evenly, reduce the radial temperature difference. 

Nested protective agent (proppant) is the porcelain ball bed section, opening the equivalent 2.5-3.5 times,Thus under the same conditions in the same tower bottom and the number is lower than the porcelain ball 60% -70% lower, so at the same flow rate, the same fluid, the same under the circumstances than the ceramic ball can make the fluid pulse to Much smaller,Due to the dense network and huge surface area, it can divide the fluid into small blocks to digest the internal pulsations and turbulences in the fluid so as to make the pulsations more even and the intensity greatly reduced, meanwhile, the throughput of the device is increased and the reaction rate is increased The heat exchanger in the rate.The slightly uniform pulsation is very conducive to the catalyst to play a role in improving the exchange rate inside and outside the fluid catalyst without deteriorating the strength of the catalyst, which not only improves the catalytic reaction rate, but also to ensure that the catalyst will not premature carbon sink and coke , Prolongs the service life of the catalyst, improves the production and operation cycle of the fixed bed reactor, improves the production efficiency, reduces the refining and processing costs, and increases the economic benefits of the enterprise.

  • Filter impurities (including inert impurities and active impurities)   

Ceramic ball due to its filter angle is a temporary combination of single porcelain ball, and porcelain ball in a pulsating and turbulent state will move slightly, the filter angle will be slightly moved, so that impurities will gradually move down, Eventually, impurities will flow through the entire bed and into the heat exchanger, which will affect the heat exchange efficiency of the heat exchanger and increase energy consumption. However, the neutron protection agent (proppant) can trap impurities in its own pores, both in pulsation and turbulence It is hard to make it move down. The application indicates that the filtration rate of various impurities exceeds 95%.

  • The proportion of small, reducing the load of the bed load

The normal proportion of porcelain balls 1.5-2.0 tons / m3 neutron protection agent (proppant) only 0.80-1.20 tons / m3, smaller than the ball more than one-third, greatly reducing the bed load.

Nested protective agent proppant size and other physical properties

LS-1

specificaiton Surface arem2/m3  void volume% Average compressive strength（N/cm） dulk density t/m3
ф25×13 1540 73.6 500 0.6-0.75
ф18×10 1544 72.8 500 0.6-0.8
ф13×10 1627 72.2 300 0.7-1.1
ф9×5 1655 71.8 300 0.95-1.15
ф6×5 1664 70.3 300 0.95-1.15
ф3×4 1673 68.5 300 0.95-1.20

Note: Different aluminum content of product bulk density is inconsistent

LS-2

specificaiton Surface are m2/m3 void volume% Dry weight, water absorption Average compressive strengthN/cm dulk density t/m3
           
      （%）    
ф18×10 1544 72.8 30-45 400 0.7-0.9
ф13×10 1627 72.2 30-45 300 0.9-1.1
ф9×5 1655 71.8 30-45 300 0.95-1.15
ф6×5 1664 70.3 30-50 300 0.95-1.15
ф3×4 1673 68.5 30-50 200 0.95-1.20

Note: Different aluminum content of product bulk density is inconsistent

LS-3

result FW-02 Analytical method
shape honeycomb Visual inspection
outside diameter mm Ф18/Ф13/Ф10/Ф6/Ф3 Vernier caliper
chemical composition % Al2O3>70% GB6900-86
Fe2O3 ＜0.1 GB6900-86
MoO3 1.0~2.0 Colorimetric method
NiO 0.6~1.2 Colorimetric method
Physical properties    
 Compressive strength N/cm ＞100 HG/T 2782
Mercury pressure pore volume mL/g 0.20~0.30 Mercury injection method
water absorption % 30-55  
Natural packing density g/cm3 0.70~1.05 Cylinder method

Note: The active metal content and composition according to the specific circumstances

LS-4

Items test method
  ф3×4 ф6×5 ф9×5 ф13×10 ф18×10 Analytical method
shape cross honeycomb honeycomb honeycomb honeycomb Visual inspection
diameter mm D3.0～4.0 D6.0～7.0 D9.0～10.5 D12.5～14.0 D17.5～19.5 Q/SY SHY 0015-2012
dulk density g/cm3 0.60～0.70 0.60～0.70 0.55～0.65 0.55～0.65 0.50～0.60 GB/T 6286
Radial crush strength N/cm ≥100 ≥150 ≥150 ≥150 ≥200 HG/T 2782
Pore volume ml/g ≥0.4 ≥0.4 ≥0.4 ≥0.4 ≥0.4 BET
BET m2/g ≥200 ≥200 ≥200 ≥200 ≥200 BET
MoO3 % 4.0～8.0 4.0-6.0 4.0-6.0 4.0～6.0 2.0-3.0 Colorimetric method
NiO 2.0～3.0 1.5-2.5 1.5-2.5 1.5～2.5 1.0-2.0 Colorimetric method

Note: The active metal content and composition according to the specific circumstances

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