【Ten Years of Rapid Development in Chemical Equipment】Preliminary commissioning of the natural gas pipeline network pressure energy recovery and cold energy utilization project completed successfully from 2012 to 2021
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Witnessing the ten-year rapid development of chemical processing equipment, I admire the prosperity and strength of modern China. Wishing everyone a happy New Year, and may their families be safe and healthy. I hope this contribution will inspire further participation from others; with you all, Haichuan becomes even better. Everyone is welcome to join in the discussions on this forum. ------------------------------------------------------------------ The recycling of new conventional energy sources such as residual pressure and heat is one of the solutions for achieving carbon peak and carbon neutrality. In July 2021, under the scorching summer sun, the project for the recovery of pressure energy from natural gas pipelines and the comprehensive utilization of cooling energy at the Sanjintan Pressure Regulation Station in Wuhan, which was designed and constructed by Iceberg Group’s Wuxin Refrigeration department, entered its final phase of intensive testing. As a technical product included in the **Recommended Catalogue of Industrial Energy-Saving Technologies and Equipment** recommended by the Ministry of Industry and Information Technology, the entire set of equipment will soon be unveiled at the Sanjintan Natural Gas Gateway Station in Dongxihu District, Wuhan, representing yet another successful example of Iceberg’s contributions to achieving carbon neutrality.
Project background: The design pressure for natural gas main lines in China is 6.3 MPa, while the design pressure for urban distribution networks downstream is 0.4 MPa. There is a large pressure difference between high-pressure gas transmission pipelines and the urban gas distribution networks along their routes, and pressure reduction is required to meet the needs of downstream users. Currently, the most common method for regulating gas pressure is isenthalpic throttling. This process does not generate any mechanical energy, but it results in a temperature drop, causing the outlet temperature to be lower than the required supply temperature of >5°C. Especially in seasons with lower ambient temperatures, the temperature after throttling can drop to as low as -20°C, releasing a large amount of heat energy that causes frost to form and block the pipes within the valves, posing significant safety risks to the urban pipeline networks downstream.
Since the company took on this project, two years have passed. Throughout the entire process of product development, equipment manufacturing, installation, system debugging, and professional commissioning, the company overcame numerous difficulties despite the huge pressures of a tight schedule, heavy workload, and strict requirements, and finally reached the debugging stage on July 25th. The company deployed an experienced professional team, which, working in extreme heat over 10 days and nights, finally completed the preliminary testing of the \"Natural Gas Pipeline Network Pressure Energy Recovery and Comprehensive Utilization of Cooling Energy System\" on August 4th. After several days of trial operation, the natural gas pressure at the Sanjintan Natural Gas Peak Shaving Station remained stable, and the actual power generation capacity of the natural gas expansion generator sets was also stable ； Under full-load operation, ice can be produced three times a day, with an output of 48 T/D, which indicates that the initial commissioning of the unit was a complete success.
Project advantages: Traditional solutions involve heating high-pressure gases in advance using boiler hot water heat exchangers or electric heating tapes, which not only consumes gas or electrical energy but also results in significant waste of pressure energy. Unlike traditional solutions, the Sanjintan pressure regulation station utilizes a comprehensive system for the utilization of natural gas pressure energy and cold energy, developed and manufactured by Wu Xin Refrigeration of the Iceberg Group. This system combines \"two-stage expansion power generation\" with \"heat pump-based supplementary heating\" and \"cold energy for ice production.\" It not only meets the pressure and temperature requirements for urban gas supply but also generates electricity and cold energy, thereby yielding good economic benefits.
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