Henan Junfang Machinery Equipment Co., Ltd |
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MODEL | PRODUCT | PRODUCTION ( Nm3/h) | Purity |
JFDO | Oxygen | 50 to 3000 | 99.6% - 99.8% |
JFDN | Nitrogen, Liquid nitrogen | 50 to 3000 | 99.9%-99.999% |
JFDON | Oxygen, Nitrogen, Liquid Oxygen, Liquid Nitrogen | 50 to 3000 | Oxygen:99.6% - 99.8% Nitrogen: 99.9%-99.999% |
JFDONAR | Oxygen, Nitrogen, Argon Liquid Oxygen, Liquid Nitrogen, Liquid Argon | O2, N2 : 50 to 3000
Ar : 5 to 90 | Oxygen:99.6% - 99.8% Nitrogen: 99.9%-99.999% Argon: 1.5ppm O2+4ppm N2
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1. Design principle of this plant is based on the different boiling
point of each gas in the air. Air is compressed, precooled and got
removal of H2O and CO2, then to be cooled in the main heat
exchanger until it is liquified. After rectification,production
oxygen and nitrogen can be collected.
2. This plant is of MS purification of air with boosting turbine
expander process. It is a common air separation plant, which adopts
complete stuff filling and rectification for argon making.
3. Raw air goes to air filter for removal of dust and mechanical
impurity and enters air turbine compressor where air is compressed
to 0.59MPaA. Then it goes into air precooling system, where air is
cooled to 17 ℃. After that, it flows to 2 molecular sieve adsorbing
tank, which are running in turn, to be got removal of H2O, CO2 and
C2H2.
* 1. After purified, air mixes with expanding reheated air. Then it is
compressed by middle pressure compressor to be divided into2
streams. One part goes to main heat exchanger to be cooled to
-260K, and sucked from the middle part of main heat exchanger to
enter expansion turbine. Expanded air returns to main heat
exchanger to be reheated, after that, it flows to air boosting
compressor. The other part of air is boosted by high temperature
expander, after cooling, it flows to the low temperature boosting
expander. Then it goes to cold box to be cooled to ~170K. Part of
it would still be cooled, and flows to bottom of lower column via
heat exchanger. And other air is sucked to low tempt. expander.
After expanded, it is divided into 2 parts. One part goes to the
bottom of lower column for rectification, the rest returns to main
heat exchanger, then it flows to air booster after being reheated.
2. After primary rectification in lower column, liquid air and pure
liquid nitrogen can be collected in lower column. Waste liquid
nitrogen, liquid air and pure liquid nitrogen flows to upper column
via liquid air and liquid nitrogen cooler. It is rectified in upper
column again, after that, liquid oxygen of 99.6% purity can be
collected at the bottom of upper column, and is delivered out of
the cold box as production.
3. Part of argon fraction in upper column is sucked to crude argon
column. There are 2 parts of crude argon column. The reflux of
second part is delivered to the top of first one via liquid pump as
reflux. It is rectified in crude argon column to get 98.5% Ar. 2ppm
O2 crude argon. Then it is delivered to the middle of pure argon
column via evaporator. After rectification in pure argon column,
(99.999%Ar) liquid argon can be collected at the bottom of pure
argon column.
4. Waste nitrogen from top of upper column flows out of the cold box
to purifier as regenerative air, rest goes to cooling tower.
5. Nitrogen from top of assistant column of upper column flows out of
cold box as production via cooler and main heat exchanger. If no
need nitrogen, then it could be delivered to water cooling tower.
For cold capacity of water cooling tower is not sufficient, a
chiller needs to be installed.