LNG作为清洁能源的代表，其液化工艺在能源领域具有重要地位。采用双混合制冷剂进行制冷，不仅提高了液化效率，还降低了能耗。冷能回收技术则进一步提升了能源利用效率，减少了浪费。焦炉煤气的利用不仅拓宽了LNG生产的原料来源，还促进了碳排放的减少。重烃、轻烃的精确分离确保了LNG的纯净度。加压液化技术提高了液化效率，而BOG提氦、膜分离等技术则实现了稀有气体的回收与利用。LNG运输船和双燃料动力船的应用推动了航运业的绿色发展。换热器与酸性气体处理技术的运用，确保了生产的安全与环保。

LNG液化工艺及其相关技术：从双混合制冷剂到酸性气体处理

液化天然气（LNG）作为清洁、高效的能源，其生产过程中的液化工艺及相关技术是关键环节。从双混合制冷剂的应用，到冷能回收、焦炉煤气的利用，再到碳排放控制、重烃轻烃的处理，以及加压液化、BOG提氦、膜分离、深冷法、氦气回收、LNG运输船、双燃料动力船、换热器和酸性气体处理等一系列技术，它们共同构成了LNG液化工艺的完整链条。

LNG liquefaction process and related technologies: from double refrigerant mixture to acid gas treatment

Liquefied natural gas (LNG) is a clean and efficient energy source, and the liquefaction process and related technologies are the key links in the production process. From the application of dual-mixture refrigerants, to cold energy recovery, coke oven gas utilization, to carbon emission control, heavy hydrocarbon light hydrocarbon treatment, as well as pressure liquefaction, BOG helium extraction, membrane separation, cryogenic method, helium recovery, LNG carriers, dual-fuel power ships, heat exchangers and acid gas treatment and a series of technologies, they together constitute the complete chain of LNG liquefaction process.

一、LNG液化工艺概述

LNG液化工艺是将天然气冷却至其露点以下，使其由气态转变为液态的过程。这一过程中，需要用到高效的制冷系统，而双混合制冷剂便是其中的佼佼者。

I. Overview of LNG liquefaction process

LNG liquefaction is the process of cooling natural gas below its dew point to convert it from a gas to a liquid state. In this process, efficient refrigeration systems need to be used, and the double mixture refrigerant is one of the best.

二、双混合制冷剂的应用

双混合制冷剂是由多种组分构成的混合物，具有优异的制冷性能。在LNG液化工艺中，它能够有效降低制冷能耗，提高液化效率。与传统的单一制冷剂相比，双混合制冷剂更能适应不同工艺条件下的制冷需求，为LNG的规模化生产提供了有力支持。

Second, the application of double mixed refrigerant

The double mixture refrigerant is a mixture composed of many components, which has excellent refrigeration performance. In LNG liquefaction process, it can effectively reduce refrigeration energy consumption and improve liquefaction efficiency. Compared with the traditional single refrigerant, the double mixture refrigerant can better adapt to the refrigeration needs under different process conditions, and provides a strong support for the large-scale production of LNG.

三、冷能回收技术

冷能回收是LNG液化工艺中节能减排的重要手段。液化过程中产生的低温冷能可以通过合理的设计和技术手段进行回收，用于其他工艺过程的冷却或加热，从而实现能量的高效利用。

Third, cold energy recovery technology

Cold energy recovery is an important means of energy saving and emission reduction in LNG liquefaction process. The low temperature cold energy generated in the liquefaction process can be recovered through reasonable design and technical means, and used for cooling or heating in other process processes, so as to achieve efficient use of energy.

四、焦炉煤气的利用与碳排放控制

焦炉煤气作为一种富含烃类的气体，可以作为LNG生产的原料之一。然而，其利用过程中产生的碳排放问题也不容忽视。因此，在LNG液化工艺中，需要采取有效的碳排放控制技术，如优化燃烧过程、提高能源利用效率等，以实现环保生产。

Fourth, coke oven gas utilization and carbon emission control

As a hydrocarbon rich gas, coke oven gas can be used as one of the raw materials for LNG production. However, the problem of carbon emissions generated in the process of its utilization can not be ignored. Therefore, in the LNG liquefaction process, it is necessary to adopt effective carbon emission control technologies, such as optimizing the combustion process and improving the energy utilization efficiency, so as to achieve environmentally friendly production.

五、重烃与轻烃的处理

在天然气液化过程中，重烃和轻烃的分离和处理是确保产品质量和工艺安全的关键环节。通过采用先进的分离技术和设备，可以有效地将重烃和轻烃从天然气中分离出来，以满足不同用途的需求。

5. Treatment of heavy and light hydrocarbons

In the process of natural gas liquefaction, the separation and treatment of heavy hydrocarbons and light hydrocarbons is the key link to ensure product quality and process safety. By using advanced separation technology and equipment, heavy hydrocarbons and light hydrocarbons can be effectively separated from natural gas to meet the needs of different uses.

六、加压液化技术

加压液化是LNG生产中的常用技术。通过提高压力，可以使天然气在较低的温度下达到液化状态。这一技术不仅提高了液化效率，还降低了生产成本。

6. Pressure liquefaction technology

Pressure liquefaction is a common technology in LNG production. By increasing the pressure, natural gas can be liquefied at a lower temperature. This technology not only improves the liquefaction efficiency, but also reduces the production cost.

七、BOG提氦与膜分离技术

BOG（蒸发气体）是LNG储存和运输过程中产生的不可避免的气体。通过BOG提氦技术，可以从这些气体中回收高价值的氦气资源。而膜分离技术则是一种高效的气体分离方法，可以在LNG液化工艺中用于天然气组分的分离和提纯。

7. BOG extraction of helium and membrane separation technology

BOG (evaporative gas) is an unavoidable gas produced during the storage and transportation of LNG. Through the BOG helium extraction technology, high-value helium resources can be recovered from these gases. Membrane separation technology is an efficient gas separation method, which can be used in the separation and purification of natural gas components in LNG liquefaction process.

八、深冷法与氦气回收

深冷法是LNG液化工艺中的核心技术之一，通过深度冷却使天然气达到液化状态。在此过程中，氦气作为稀有气体可以通过特定的回收技术进行提取和分离，从而实现资源的最大化利用。

Cryogenic method and helium recovery

Cryogenic method is one of the core technologies in LNG liquefaction process, which makes natural gas reach liquefied state by deep cooling. In this process, helium as a noble gas can be extracted and separated by specific recycling technologies, thus maximizing the utilization of resources.

九、LNG运输船与双燃料动力船

LNG运输船是连接LNG生产地与消费地的重要桥梁。随着技术的不断进步，双燃料动力船作为一种环保、高效的运输工具，在LNG运输领域的应用越来越广泛。这种船舶可以同时使用LNG和柴油作为燃料，有效降低了碳排放和运营成本。

9. LNG carriers and dual-fuel powered ships

LNG carrier is an important bridge connecting LNG production and consumption. With the continuous progress of technology, the dual-fuel power ship, as an environmentally friendly and efficient means of transport, has been more and more widely used in the field of LNG transport. Such ships can use both LNG and diesel as fuel, effectively reducing carbon emissions and operating costs.

十、换热器在LNG液化工艺中的作用

换热器是LNG液化工艺中的关键设备之一，用于实现不同温度流体之间的热量交换。通过合理选择和配置换热器，可以优化液化工艺的热力过程，提高能源利用效率。

10. The role of heat exchanger in LNG liquefaction process

Heat exchanger is one of the key equipment in LNG liquefaction process, which is used to realize the heat exchange between fluids with different temperatures. The thermodynamic process of liquefaction process can be optimized and the energy utilization efficiency can be improved by rationally selecting and configuring heat exchangers.

十一、酸性气体处理

天然气中通常含有一定量的酸性气体（如硫化氢、二氧化碳等），这些气体不仅会对设备和管道造成腐蚀，还会影响LNG的产品质量。因此，在LNG液化工艺中，需要采用有效的酸性气体处理技术，如脱硫、脱碳等，以确保生产过程的安全和产品质量的稳定。

11. Acid gas treatment

Natural gas usually contains a certain amount of acidic gases (such as hydrogen sulfide, carbon dioxide, etc.), which will not only cause corrosion to equipment and pipelines, but also affect the quality of LNG products. Therefore, in the LNG liquefaction process, it is necessary to use effective acid gas treatment technology, such as desulfurization, decarbonization, etc., to ensure the safety of the production process and the stability of product quality.

如图1所示为天然气液化装置现场图。产量为2吨/天。模块化设置，易于安装，可实现完全自动化和远程控制系统管理。

FIG. 1 shows the site diagram of the natural gas liquefaction unit. The output is 2 tons/day. Modular setup for easy installation, complete automation and remote control system management.

图1所示为天然气液化装置现场图

FIG. 1 shows the site diagram of the natural gas liquefaction unit

江苏航烨能源科技有限公司提供微型和小型天然气液化装置。这些工厂的产能涵盖2万至30万Nm3/天的液化天然气生产。

Jiangsu Hangye Energy Technology Co., Ltd. provides micro and small scale natural gas liquefaction units. The capacity of these plants covers between 20,000 and 300,000 Nm3/ day of LNG production.

此外，航烨能源联合中科院多年技术深耕，解决了一系列关键技术:高效的流道技术、可靠的静压气体轴承技术、动压气浮轴承技术、转子动力学技术、绝热技术、装配及测试技术、系统集成等。研发产品主要参数如下:

1、膨胀气量:50 ~6000Nm3/h，可根据用户定制；

2、温区范围:300 K-110K，可根据用户定制；

3、进口压力范围:3-15 bara；

4、转速范围:30000-150000rpm；

5、等嫡效率:82%-90%;

6、寿命:无故障运行5-10年;

7、制冷量:1~60 kW，可根据用户定制。

8、轴承形式:静压或动压气体轴承、电磁轴承、油轴承等。

9、设备具体可以根据客户需求来定做。

In addition, Hangye Energy and the Chinese Academy of Sciences have worked together for many years to solve a series of key technologies: efficient flow channel technology, reliable static pressure gas bearing technology, dynamic pressure air floating bearing technology, rotor dynamics technology, heat insulation technology, assembly and test technology, system integration. The main parameters of R&D products are as follows:

1, expansion volume :50 ~6000Nm3/h, can be customized according to users;

2, temperature range :300 K-110K, can be customized according to users;

3, inlet pressure range :3-15 bara;

4, speed range: 3000-150000rpm;

5, equal entropy efficiency: 82-90%;

6, life: trouble-free operation of 5-10 years;

7, cooling capacity :1~60 kW, can be customized according to user.

8, bearing form: static pressure or dynamic pressure gas bearings, electromagnetic bearings, oil bearings, etc.

9, the equipment can be customized according to customer needs.

本公司深耕于油气田地面井口处理、天然气净化提纯、原油加工处理以及轻烃资源回收等领域，致力于提供一站式服务。我们专注于LNG装置和天然气发生器的设计创新、精细制造以及专业安装，以满足客户多样化的需求，并致力于为客户量身打造全方位的解决方案。

欢迎有天然气膨胀液化相关需求的LNG液化工厂，液化生产线、中小型天然气液化生产企业业主、科研院所等用户来电详询、实地考察。您的需求，是航烨人砥砺前行的不竭动力。

The company is deeply engaged in the fields of surface wellhead treatment of oil and gas fields, natural gas purification, crude oil processing and light hydrocarbon resource recovery, and is committed to providing one-stop services. We focus on the design innovation, precision manufacturing and professional installation of LNG plants and natural gas generators to meet the diverse needs of our customers, and are committed to creating a full range of tailored solutions for our customers.

LNG liquefaction plants, liquefaction production lines, owners of small and medium-sized natural gas liquefaction production enterprises, scientific research institutes and other users are welcome to call for detailed inquiries and field visits. Your needs are the inexhaustible driving force for Hangye people to forge ahead.