Atlas Copco's conveying solutions help Hengli Group's 1.6 million-ton high-performance resin project

Hengli Group is one of the leading companies in the domestic oil and gas industry
.
Hengli Petrochemical (Dalian) New Material Technology Co.
, Ltd.
's 1.
6 million tons/year high-performance resin and new material project has also started a major project signing ceremony in the first quarter of 2022
.

The main products involved in this project include bisphenol A 231,800 tons/year, isopropanol 131,200 tons/year, ethylene oxide 130,000 tons/year, polycarbonate 260,000 tons/year, electronic grade DMC (including EC , EMC and DEC) 200,000 tons/year, ABS 300,000 tons/year, GPPS 75,000 tons/year, HIPS 75,000 tons/year, ethanolamine 160,500 tons/year, PDO 72,000 tons/year, PTMEG 60,000 tons/year /year
etc.

Assist PC delivery

In the polycarbonate production unit, Atlas Copco has a total of 5 ZH centrifugal compressors used in the pneumatic conveying process, and the conveying medium is polycarbonate particles, serving six production lines
.

The conveying capacity is 8 – 27 tons/hour, the conveying distance is about 1500 meters, and the conveying pressure is 4.
1 barg.
The air supply source also comes from the main process compressor, and the whole adopts positive pressure and air conveying
.

Widely used polycarbonate

Polycarbonate (PC) is an important chemical product and plays an important role in the development of the national economy
.
The top five countries in terms of production capacity are the United States, Germany, China, South Korea and Japan
.

In recent years, with the increasing domestic polycarbonate market demand, domestic production capacity has grown rapidly.
It is estimated that China's polycarbonate production capacity will be close to 2.
7 million tons in 2022
.
In the process of increasing polycarbonate production capacity, Atlas Copco can always be seen.
For example, 6 ZE6s help Tianjin Zhongsha Petrochemical's polycarbonate air delivery, ZR is in Zhejiang Petrochemical site and Hainan Huayuan Chemical Co.
, Ltd.
Great service and more
.

At the same time, in addition to PC itself, pneumatic conveying is also required in the upstream BPA production process, such as the successful application of multiple ZAE oil-free screw low-pressure compressors of Atlas Copco in the BPA project of Zhongsha Petrochemical
.

Choice of pneumatic conveying

Pneumatic conveying is one of the important applications of compressed air, which is widely used in oil and gas, chemical, food, cement and other industries
.

Pneumatic conveying has an important reference index—material-gas ratio.
This parameter is related to pipe diameter, distance, and medium density.
It is an important concept in pneumatic conveying, and requires a professional team to help calculate
.

Usually in pneumatic conveying, the most widely used combination is that a single device serves a single blanking point.
The advantage of this is that the air sources are independent of each other, which is safer, the control is relatively convenient, and the pipeline layout is more flexible
.
In this context, the Roots blower and the screw low-pressure compressor are the absolute main force.
Since there is no risk of surge in positive displacement compression, it also ensures the safety and stability of transportation
.
In the gas environment of 0.
5barg and above, screw low-pressure compressors have also replaced Roots blowers and become the first choice of more and more people because of their more energy-saving advantages
.

At the same time, for some scenarios, centralized gas supply is also a good choice
.
Especially for multi-point unloading, where the ratio of gas consumption to the main pipeline is small, you can choose to lead one channel of gas for transportation, which often does not have a great impact on the selection of the main equipment
.
Although this method will place higher requirements on the arrangement of pipelines, valves, and control logic, the initial investment savings is also very obvious
.

Providing compressed gas solutions that are truly matched to customer processes has always been one of Atlas Copco's key philosophies
.
The application of the pneumatic conveying centralized gas supply scheme of Hengli New Materials provides an excellent example for future projects
.