HP scrubber, circulation pump and HP ejector is
approximately
g
3 million.
Case study: the Linggu project
The 2700 tpd Linggu plant in Yixing, China, was designed in
2013 and commissioned in 2015. It is the first grassroots
plant that incorporates the adiabatic flash technology in
operation.
The Linggu process concept with a pool condenser and
HP scrubber is detailed in Figure 1. It includes two energy
optimising technologies:
n
n
Heat exchange of the HP scrubber cooling water with
the first stage evaporator.
n
n
Implementation of the LAUNCH MELT Flash design
technology.
The realised reduction in steam consumption in the
plant in comparison with the same flow scheme without
adiabatic flash is well above 100 kg/t of final product.
Linggu in operation
The urea plant was started up in November 2015 and
reached a capacity of 95% within a couple of days. After 12
months of operation, the concept had realised a steam
consumption of well below 800 kg/t of final product
whilst running at 100% capacity.
Plant operation was simple due to the damping effect
of the MP stage. The heat duty of the MP carbamate
condenser (shell side of the pre-evaporator) was such that
a 78% urea solution was produced as feed for the
evaporation section.
Conclusion
The installation of the LAUNCH MELT Flash design at the
Linggu project proved successful. With this design, the
stream consumption of the urea plant dropped significantly.
From this, reduction of more than 100 kg/t of final product
can be realised in both grassroot and existing plants.
With the flash technology installed, the urea plant
becomes more robust in operation; variations in load
from the synthesis to the downstream sections are
handled by the very efficient medium-pressure
condensation and do not lead to upsets in the
low-pressure section.
The technology allows the design of the urea plant to
omit the HP scrubber without increasing ammonia losses.
This simplifies the synthesis loop operation, lowers
investment costs and reduces steam consumption. The
flash concept can also increase the capacity of the
downstream section, increase the energy efficiency of the
plant, thereby lowering production cost, and it can be
used in a plant revamp as an alternative for an end of life
HP scrubber replacement.
• Over 50 years experience in building Roll Compactors for
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• Over 135 Compactors operating in Fertilizer Plants worldwide.
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