Product Detail
Sulphuric acid catalyst (also named vanadium pentoxide
catalyst) suits for that sulphuric acid plants use the contact process
to promote the oxidation of SO2 and O2 to give SO3.
Based on more
than 30 year’s experience with sulfuric acid catalyst, our factory can
manufacture several types of catalysts in different shapes and sizes,
such as S101, S101-2H, S101-3MH, S108, S108-2H, S108-3MH, etc. Our manufacturing
technique is advanced. The carrier is treated by repulped stock
processing, washed by hot concentrated acid, pretreatment of
calcinations, and added several rare accessory ingredients, then molded
by using advanced patent technology. The performance of our catalysts is
excellent, with high activity, low ignition temperature, high
mechanical strength, low losses of screening, and long life. As for star
ring type of catalyst, it has advantage of large surface area, low
pressure drop, and good resistance of dust accumulation.
1. Broad Temperature Type of Sulfuric Acid Catalyst: S101.
1).Type S101
S101(Cylinder); S101-2H(Ring);
S101-3MH(Star Ring). Type S101 series catalyst is
a medium broad temperature vanadium pentoxide catalyst to promote the
oxidation of SO2 and O2 to give SO3, which is developed independently in
China. This catalyst has a manufacturing history of over 40 years with
high standard quality and steady performance, has reached international
advanced levels.
This catalyst has advantages of wide applicability,
broad range of temperature, high conversion and high mechanical
strength. Ring or star ring shaped catalysts have solved some problems
with cylinder shaped catalyst, which are small pellets, high pressure
drop and high energy consumption, bad resistance of dust accumulation.
2. Low Temperature Type Sulfuric Acid Catalyst: S108.
Type S108
S108(Cylinder); S108-H (Ring); S108-3MH (Star Ring)
Type S108 Series sulfuric acid catalysts have advantages of low ignition temperature, high conversion, and lowering environmental pollution.
3. The sulphuric acid catalyst operation manual
1). Range of Application
1). Sulphur iron ore making sulphuric acid
2). Smelts smoke gas making sulphuric acid
3). Sulphur burnt making sulphuric acid.
2). Operating Requirements
1). Type S101 series of broad temperature catalysts suit for every bed of converter.
2).
Type S108 series of low temperature catalysts suit for 1/3 top of
the first bed to decrease inlet operating temperature, and 4th bed, 5th
bed to improve equilibrium conversion and decrease gas emission.
3).
Install the catalyst beginning at the far side of the converter working
back towards the manway. Use the marks on the converter wall as a guide
for leveling the catalyst. Avoid walking directly on the catalyst. Use
plywood sheets or boards laid on top of the catalyst if access is
required across the top of the bed.
4). New catalyst is easy to get
damp, so it is better to choose fine days to sift it and load it .Time
that catalyst is exposed in air should be as short as possible.
5).
Catalysts used in low temperature beds can be moved to high temperature
beds, but contrarily it can’t be loaded. New catalysts should be loaded
in the surface of each bed, and separated from used catalysts with
stainless steel nets.
6). It should inspect the pressure drop of each
bed before repairing, and inspect the activity of catalysts in each bed
before loading, so that supply some information for screening, loading
or removing.
3). Star-up and Shut down
1).
Heating up: Before start-up, heating up with dry air. The rate of
heating is 20-30℃/h, but for new catalysts, the rate of heating should
be controlled in 10-15℃/h before it reaches 150℃. In the plants using
diesel oil for heating, the discontinuous heating method is recommended
when the temperature is under 150℃, and make sure it burnt thoroughly in
order to prevent the surface of catalysts extracting carbon. While
heating, please control the moisture from blower, which should be not
higher than 0.1g/Nm3.
2). Gas injected: When inlet temperature of 1st
bed reaches above 400℃, and inlet temperature of end bed is above 250℃,
then the gas can be injected. Initial volume of gas flow is 1/3-1/2 of
the total, and the gas concentration below 5% is ok. Then, make sure the
exit temperature of 1st bed is not higher than 650℃, and increase the
gas concentration and gas flow properly.
3).Shut down: For a
short-time shut down, it should increase the inlet temperature of 1st
bed(increasing 15℃), and close valve. However, for a heavy repair or
long-time shut down, it should use dry air above 400℃ to replace the gas
in the converter, till the content of SO3 in emission gas is less than
0.03%.
4). Purifying index demanded of catalysts
Water,
acid mist, mine dust and the arsenical of content will make catalyst
curdled and poisoned; it will affect the system resistance and
Conversion ratio. The following indexes should be well controlled.
Moisture ≤ 0.lg/Nm3 F ≤ 0.00lg/Nm3
Acid mist ≤ 0.03lg/Nm3 As ≤ 0.00lg/Nm3
Mine dust ≤ 0.005g/Nm3
Reference