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  Case Study / Anshan Steel Company  
 

This case study illustrates the use of chilled water on a joint steel mill and petrochemical plant.

Company Information

Anshan Steel Company
State Owned
Anshan, Liaoning Province
North-East China

Background

The Liaoning province has been home to a large industrial revolution over the last century. There are numerous coal mines, oil refineries, petrochemical plants and steel mills operating on a large scale in this area.

Anshan steel is the largest steel producer in China, with over 100,000 employees on site. The factory produces many basic steel products as well as incorporating a petrochemical plant for coking production and others. The petrochemical plant employs 3,000 people.

 
Fig. 1 Panoramic View of the Steel Works and Petrochemical Plant

The Problem

Poor heat exchange in the coking plant and other areas leads to inefficient production of processed materials and excess gases plus large volumes of water utilisation.

The Solution

To ensure heat exchange within the petrochemical division is optimized cold water is needed. For most of the year the ambient temperature of the circulation water is too high. Therefore an additional process is needed to control the temperature of water.

Prior to Wap-Flaro absorption chilling was commissioned to achieve these results. After installation running costs proved too high because of chemical additives needed (lithium bromide) and volumes of water required.

A New Approach

 

It was decided that WF would be the most economical solution to this problem. In October 2001 WF was commissioned on site.

In this case the steel works have fed 2 process water lines to the WF plant. One line cools down general process water for the petrochemical facilities and the other line is used for cooling liquefied ammonia also within the petrochemical works.

 
Fig. 2 Picture shows the whole plant

The benefits of operating WF over other methods include:

  • Use of very low-pressure waste steam
  • Very little additional water usage
  • Very low power consumption, as there are no moving parts, only small integral pumps required
  • No chemical additives needed only steam and water

Operational Data

 

Required/Available

Result

Wap-Flaro Capacity

2,000,000 kcal

2,002,000 kcal

Chilled Water Capacity

250m³/h

210m³/h

Temperature Reduction

8°C

12°C

Steam Pressure

2.5 - 3 bar

4.9 bar

Steam Input

Saturated - 130°C

Overheated - 192°C

Steam Consumption

6,229kg/h

5,000kg/h

Ambient Temperature 20°C

Conclusions

WF has succeeded in reducing circulation water temperature to optimum levels for production efficiency. This achievement will ensure greater efficiency and volume of production as well as a much more efficient water usage system.

Customer Evaluation

Miss Wang Ho-Jen

Wap-Flaro Plant Manager for Anshan Steel

Physics and Engineering Graduate of Shenyang University

 

"We use 10 m/h of water to cool down the liquefied ammonia and 200 m/h to cool down process water for the coking plant mainly.

"The temperature of the ammonia is very high, between 70 and 80°c. We can now cool this to 40-50°c using the heat exchangers in the (WF) factory.

"We can also cool down process water to 8°c using other heat exchangers within the (WF) plant.

"Cold water production in the plant has been normally over 200 m³/h.

"Working pressure of the steam is approximately 3 bar from the source, maybe a little bit less by the time it reaches our plant.

"We have been running the plant continuously since it was commissioned in October last year.so far we are very pleased with the results we have been receiving."

 

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