New Approach to Process Gas Compression

Applications ::

Vacuum Distillation Units:

Case study 5: SINOPEC Tahe Refinery
Case study 6: API Ancona Refinery

Case study 5: Vacuum Distillation Unit at SINOPEC Tahe Refinery, China

Vacuum Distillation Unit at SINOPEC Oil Refinery in Tahe, China 2004

SINOPEC Tahe Refinery, 2004

SINOPEC Tahe Refinery

Application: Vacuum Distillation

System: VDU vacuum system

Location: SINOPEC Tahe Refinery, China


INTRODUCTION

In vacuum towers steam ejectors are notoriously sensitive to variations in steam quality and seasonal fluctuations in cooling water temperature. This can make operation unstable and increase the need for maintenance. Such factors have no impact on Hijet vacuum systems. The opportunity to eliminate contaminated steam and reduce energy consumption is the use of the Hijector™ - a liquid jet ejector of proprietary design.

The unique Hijet vacuum system was commissioned in December 2005 at the SINOPEC Tahe Refinery, China.

THE CHALLENGE

Tahe refinery faced continuous problems with their existing steam ejector system that required regular maintenance due to corrosion problems. An additional challenge was to reduce the energy consumption along with eliminating sour water production and lowering green house emissions.

Hijet Process Vacuum System Diagram

Hijet vacuum system diagramm

HIJET SOLUTION

Hijet vacuum system was chosen as it has a proved track record for its high reliability and for being maintenance free.

The Hijet vacuum system at Tahe refinery utilizes two parallel single stage Hijectors™ - liquid jet ejectors of proprietary design. Using LVGO as the motive liquid, the system is capable of pulling vacuum to 15mm Hg at the top of the column.

The system also includes separator, centrifugal pump and cooler.

CONCLUSIONS

SINOPEC Tahe Refinery with Hijet Vacuum System 2005

SINOPEC Tahe Refinery with Hijet system, 2005

Hijet vacuum systems currently represent the best option for minimizing the environmental impact and complying with the IPPC directive and the Kyoto protocols.

Refineries and chemical plants subjected to stringent environmental legislation will benefit the most from this technology.

SYSTEM BENEFITS

  • Increased reliability.
  • Easy start up and shutdown.
  • No motive steam reduced emissions.
  • No sour water production reduced emissions.
  • Reduced operational expense in comparison with the traditional steam ejector system while increasing reliability.

Estimated benefits of using of the Hijet vacuum system :

ParameterSteam Ejector three-stageHijet single-stage
Vacuum column Pressure 40 mm Hg40 mm Hg
Gas Flow from vacuum column 1,150 kg/h1,150 kg/h
Motive steam consumption7.0 tons/h0 tons/h
Cooling water consumption420 m3/h100 m3/h
Electric power Requirement 0 kW1,000 kW
Operation time (355days / year)8,520 h8,520 h
HP steam consumption / year 59,640 t0 t
CW consumption / year3,578,400 m3852,000 m3
Power consumption /year 08,520,000 kWh
Cost of HP steam / year $656,040$0
Cost of cooling water / year$107,352$25,560
Cost of electric power / year$0$511,200
Total cost of energy / year $763,392$536,760
Minimum yearly direct saving 0$226,632
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