China: new LNG liquefaction technologies? 

When people talk about new liquefaction technologies in China, many people immediately think about giant factories and import licenses. But reality often revolves around more mundane things - adaptation, cost optimization and solving specific problems that cannot be described in textbooks. This is where it gets interesting.

Not only scale, but also flexibility

To be honest, five to seven years ago, conversations were mainly about mega-projects. Everyone was chasing volumes and purchasing ready-made production lines. Now the focus has shifted. The key word is now -modular installationsand solutions for medium and small capacities. Why? Demand is dispersed, logistics are complex, and it’s not possible to install a giant terminal everywhere. I saw projects in the provinces of Sichuan and Shaanxi - local solutions for associated gas or for supplying remote enterprises are often needed there. This is where the Chinese approach comes into play: not to create fundamental technology from scratch, but to make existing processes cheaper and more versatile.

Let's take cryogenic equipment, for example. Previously, we were heavily dependent on the import of certain types of heat exchangers. Now local manufacturers, the same ones that work with institutions likeChengdu Yizhi Technology Co., offer options with other materials and configurations that better withstand fluctuations in gas composition. This is critical for many fields in China where gas is unstable. On their websiteyzkjhx.ruIt can be seen that they position themselves as a design institute with a registered capital of 120 million yuan - such organizations often act as a link between academic developments and engineering companies, translating ideas into working drawings.

I had a story about one of the projects near Chengdu. Investors wanted to apply a standard liquefaction scheme, but the composition of the raw material constantly “floated”. We had to make adjustments to the pre-treatment system on the fly, combining adsorption and membrane separation. The solution was not textbook perfect, but it worked. It was in such situations that experience was forged, which cannot be bought with a license.

Where to look for real innovation?

Often the breakthrough is hidden not in the main liquefaction process, but on the periphery. Systemscold recoveryand intelligent energy management - this is where the real fight for efficiency is now taking place. The efficiency of the installation can be increased by several percent simply by wisely using the cold of the exhaust flows and optimizing the load on the compressors in real time. It's not as dramatic as announcing a new liquefaction technology, but it has a huge impact on operating costs.

An engineer friend from Shanghai once talked about a pilot installation where machine learning algorithms were used to predict load. The system learned from operating history and could predict when it was best to start a particular compressor unit, taking into account the cost of electricity at different times of the day. The savings were significant. True, then problems emerged with the reliability of sensors at low temperatures - innovations depend on the quality of “iron”.

Another point is the materials. Chinese manufacturers are actively promoting domestic insulating materials for cryogenic pipelines and containers. In terms of characteristics, they are already close to the best foreign analogues, and they beat the price. But implementation is slow: many operators are conservative and do not want to take risks on large facilities. Therefore, the first applications are often seen on small, niche projects, where there is more willingness to experiment.

Failures and lessons: you can’t live without them

You can’t talk about development without remembering failures. There was a high-profile project a few years ago - an attempt to quickly localize the production of key turboexpanders for medium capacities. They focused on speed and cost, and slightly underestimated the issues of metallurgy and balancing of rotors operating in extreme conditions. The result is increased vibration and frequent stops. We had to return to joint development with European partners, but taking these bitter lessons into account. Now the approach is more hybrid: design and assembly can be local, but critical components are purchased from trusted specialists, or their production is mastered with the involvement of direct technology consultants.

Another common stumbling block isgas pre-purification. Chinese gas often has high CO2 and sulfur content. Standard amine flushes are not always effective and energy-consuming. Seen attempts to introduce membrane technologies for CO2 removal at an early stage. The technology is promising, but we are faced with the problem of membrane durability in the presence of heavy hydrocarbons and real pressure fluctuations. The pilot worked for a year, then his efficiency dropped. Now, as far as I know, they are working on hybrid systems: membranes + final adsorption. This increases capital costs, but will probably pay for itself in operation.

These failures are not a sign of weakness, but part of the normal engineering journey. They form the very practical knowledge that distinguishes a real specialist from one who simply read reports.

The role of engineering companies and institutes

Here it is worth returning to structures like the one mentionedChengdu Yizhi Technology Co., Ltd.. It's not just ?another company?. Such design institutes, created on the basis of larger technology holdings (as in this case Huaxi Technology), play a crucial role. They accumulate experience gained from various, sometimes unsuccessful projects, and turn it into standard, but adaptable solutions. Their strength lies in their ability to take fundamental technology and “sharpen” it. it to the specific conditions of a particular field or region.

For example, their specialists can work out in detail the scheme for integrating a low-capacity LNG liquefaction plant with the existing gas distribution infrastructure, and calculate all the safety nuances for a seismically active zone. This is not about selling equipment, but about selling a workable technology package on a turnkey basis. The registered capital of 120 million yuan indicates serious intentions and the ability to take on complex projects.

Collaborated indirectly with one such team. They didn’t just offer a standard set of devices, but first spent six months simulating the operating modes of the future installation using historical data on the customer’s gas. As a result, they proposed a non-standard configuration of the cooling cascade, which reduced the peak load on the power grid. This is the same applied engineering that creates added value.

Looking ahead: what will drive the industry?

I think the next few years will be defined by two trends. First -digitalization and remote monitoring. It is no longer enough to simply build a plant. Customers want tools for predictive maintenance, real-time performance analysis, and remote management from qualified specialists from a central office. This reduces operational risks for installations located in hard-to-reach areas.

The second trend is even greater attention to the environment and recycling. This is about reducing emissions from the liquefaction processes themselves (for example, by using electric drives instead of gas turbines where possible) and solutions for recycling emission streams, such as boil-off gas (BOG). Interesting cross-industry solutions could emerge here, such as using excess cold for other industrial processes nearby.

And, of course, there will be constant pressure to reduce capital expenditures (CAPEX). Therefore, modularity, standardization of components and the use of locally produced components where it is not critical for reliability will only increase. New liquefaction technologies in China are not about one sensational development. This is about the gradual, sometimes with errors, but very pragmatic evolution of the entire technological stack - from the well to the cryogenic tank, with a constant search for how to make the process a little cheaper, a little more flexible and a little more reliable in local conditions. It is in this routine, unglamorous work that real progress is born.