Recently, the construction of a 90,000 tons/year LNG production unit project at a chemical company in Ningxia was completed by the end of December 2022 after almost a year of work. On April 12, 2023, various processes began receiving gas and feeding materials for trial production. Just four days later, qualified LNG was successfully produced. After 72 hours of continuous stable operation, the hourly LNG production reached over 10 tons.

The project combines the production of synthetic ammonia with liquefied natural gas (LNG), offering advantages such as low investment, low consumption, no pollution, and high energy utilization. It is an excellent choice for coking enterprises. The optimized process "grafts" onto the original synthetic ammonia process by pre-treating, purifying, transforming (original), decarbonizing (original), desulfurizing precisely, and methane conversion (existing modification) of coke oven gas. The purification of process gases adopts deep cryogenic separation method while gas liquefaction utilizes a combination of mixed refrigerant cycle + nitrogen refrigeration cycle + liquid nitrogen washing process to separate CH and CmHn compounds at low temperatures.

At the same time, the conversion units in the original synthetic ammonia plant including first-stage furnace, second-stage furnace, and waste heat boiler will be shut down. The hydrogen-rich gas separated through deep cryogenic separation will be combined with nitrogen in a ratio of three to one and sent to the existing synthetic ammonia plant to produce 150 thousand tons/year of liquid ammonia. Based on the existing 150 thousand tons/year synthesis ammonia plant using coke oven gas as feedstock, this project aims to establish a circular economy utilizing 90 thousand tons/year LNG from coke oven gas production.

Hope Senlan can implement the "green" development concept and actively respond to the "dual carbon" strategy. Considering the construction of a circular economy for the project, we provide higher quality solutions and service levels tailored to customer site conditions, continuously improve production process technology, enhance energy efficiency, help save energy and reduce emissions, and customize refrigerant compressors - high-pressure variable frequency system solutions for them.

The project mainly consumes energy in the form of electricity and residual coke oven gas, with an annual electricity consumption of 30,295.40 million kWh and a consumption of 48,000 million m³ of residual coke oven gas. The annual production of LNG is 90,000 tons. It is hoped that Senlan can provide comprehensive energy consumption data for customers after the technical transformation of the equipment: 156,621.04 tce (equivalent value) and 207,911.15 tce (equivalent value). Among them, the monthly increase in comprehensive energy consumption due to the production of 90,000 tons of LNG is 4,399.37 tce (equivalent value) and 27,618.65 tce (equivalent value).

According to reports, based on current market conditions for LNG, the project will generate an average annual increase in sales revenue for the company amounting to CNY450 million and an average annual increase in profit amounting to CNY225 million. At the same time, there has been a slight increase in capacity for ammonia synthesis at the company's original plant while reducing consumption by discontinuing catalytic conversion processes. This has resulted in improved efficiency and significantly enhanced overall market competitiveness for the company.

The road is long and arduous, but if we keep moving forward, we will eventually reach our destination. We  will continue to pursue the "dual carbon" goals and contribute to a more efficient, energy-saving, and environmentally friendly industry. The successful operation of the 90,000 tons/year LNG project utilizing coke oven gas in a circular economy not only marks a small step for Senlan's high-power transmission control products in the LNG industry but also holds significant importance in terms of economic benefits, social benefits, and environmental benefits.

As a national project encouraged for development, resource utilization, and green low-carbon circular economy initiatives, this project not only eliminates pollution from coke oven gas emissions but also maximizes the comprehensive utilization of coke oven gas. At the same time, by replacing civilian fuels such as gasoline and diesel with clean natural gas LNG produced through this project, it reduces vehicle exhaust emissions and improves local environmental quality. Thus achieving "two-way emission reduction" of pollutants.

Founded in 1998, SLANVERT  is a national-level high-tech enterprise specializing in energy conservation & environmental protection, new energy sources, transmission control, and intelligent equipment fields. The company integrates R&D manufacturing, system integration, and customer service to deliver comprehensive solutions. Its product range includes high/low voltage variable frequency control systems, automation production lines and robot transmission control systems,EPS (Emergency Power Supply) units,port shore power systems,multi/single crystal silicon power supplies,and other industrial power supply systems. With over 20 years of dedication to excellence under their business philosophy of "Excellence without Boundaries，Infinite Hope", SLANVERT  products are now distributed across more than 30 countries including China , India,South Africa,Brazil ,Italy ,Denmark,Singapore ,Indonesia,Malaysia,Vietnam,Turkey etc.