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Case of DEAR air separation and Shandong Hujing Company
2020-10-26 17:19:27
Project Overview

DEAR air separation signed the contract with Shandong Hujing Iron and Steel Co., Ltd.. The set of air separation plant was successfully started at first time, all indexes exceeded the design indexes, and the working condition was stable. Process characteristics of the project: multistage distillation, hydrogen free argon production.


Product Advantage

The unit adopts molecular sieve purification, booster turbine expander to supply the cooling capacity of the unit, and the whole rectification hydrogen-free argon production process, which is safe, reliable and economical. The main reasons are as follows:

1.Good safety

The whole set of device has the advantages of low operating pressure, simple process, high equipment safety, long switching cycle of molecular sieve system, increased service life of switching valve, and reduced potential hazards.

A large amount of liquid oxygen is extracted from the main cooling (K1) to minimize the possibility of hydrocarbon accumulation.

2.High reliability

A large amount of surplus nitrogen can be sent to the water cooling tower, reducing the load of the water chiller, reducing the energy consumption and cost of air separation, so that the reliability of the device is further improved.

3.Convenient operation and maintenanceandsimple process


Technical Parameter

PRODUCT

OUTPUT N m³/h

PURITY

PRESSURE OUT OF COLD BOX Mpa

   TEMP

NOTE

OXYGEN

12000

≥99.6% O2

0.015

NORMAL

EXTERNAL COMPRESS TO 2.5Mpa

LOX

300

≥99.6% O2

Into tank

SATURATED

 

Nitrogen

12000

≤10ppmO2

0.008

NORMAL

To pre-cooling system

Nitrogen

12000

≤10ppmO2

0.008

NORMAL

EXTERNAL COMPRESS TO 2.5Mpa

LAr

400

≤1.5ppmO2
≤4ppmN2

Into tank

SATURATED

 

Note: the unit of measurement Nm3/h is measured at 0 ℃, 0.1013Mpa (A). It is called standard state quantity.

1.1 Take oxygen and nitrogen at different times

1.2 Operation cycle (interval between two large heating): ≥ two years

1.3 Heating and uncooling time of the device: ~ 36 hours

1.4 Starting time of the device (from the start of expander to the purity of oxygen product): ~ 40 hours


Matching Units

Matching Units

 Unit

1. Centrifugal air compressor   

2. Air pre-cooling system

3. Purification system

4. Booster turbine expander 

5. Fractionator system

6.Nitrogen compression system  

7.Oxygen compression system

8.Liquid storage system 

9.Instrument control system

10.Electric control system  

1 set

1 set

1 set

1 set

1 set

1 set

1 set

1 set

1 set

1 set


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