The lower section of the gasifier in the gasification unit of the technical renovation project for the Qilu Yihua syngas plant has arrived at the site successfully

Thread Content

The lower section of the gasifier, a key component of the gasification unit for the technical upgrade project of Qilu No.1 Chemical’s synthesis gas plant, arrived at the site successfully. Author/Source: Sales Company of Yangmei Chemical Industry Co., Ltd. Date: 2022-01-24. Clicks: 16. On January 20, the lower section of the gasifier, the core equipment of the gasification unit for this technical upgrade project carried out by Huisheng Company, arrived at the site successfully. In the gasification section of the technical renovation project for Qilu Yihua’s 45,000 Nm3/h syngas plant, Jinhua Furnace (3.0) coal water slurry gasification technology is used to replace the existing fixed-bed batch gas production process. The gasification unit employs a syngas-steam co-generation gasification technique, which not only helps to reduce the company’s operating costs but also enhances its inherent safety and environmental protection standards. The gasifier was manufactured by Lu’an Huaji Machinery; it was loaded in Shanxi on January 12 and took 8 days to reach Qilu First Chemical. The lower shell that arrived at the factory today weighs approximately 220 tons and is about 22 meters long. Due to the excessive length of the transport vehicles and the heavy load they carry, high requirements are placed on the road’s levelness and load-bearing capacity at the site. To meet the requirements for transporting large-scale equipment and ensure that critical devices arrive at the site on time, the relevant departments and workshops of the company organized specialized personnel to inspect and protect the underground pipelines and cable trenches at the installation site in advance. Construction management personnel, together with relevant specialists, worked on planning the road transport routes. Once the plan was finalized, construction workers and machinery were immediately mobilized to work overtime through the night to ensure that the road transportation and lifting areas met the required capacity standards before the sections of the gasifier arrived at the site. The first gasifier in the project’s gasification unit was transported to the designated location as scheduled, marking that the first phase of the project is about to enter the stage of equipment lifting and installation, thus creating favorable conditions for subsequent work. Zibo Qilu No.1 Fertilizer Co., Ltd. of Yangmei Group produces ammonia and urea using coal-based syngas. Its current production capacity is as follows: 180,000 tons per year of ammonia in total (of which 140,000 tons are liquid ammonia and 40,000 tons are methanol), 210,000 tons per year of urea, 210,000 tons per year of butyl octanol, 2.32 million tons per year of steam, and 86.4 million kW·h per year of electricity generation. Its predecessor was the First Fertilizer Plant of Qilu Branch of Sinopec Corporation; it was established in July 1969 and came online for operation in December 1972. It was China’s first domestic medium-sized nitrogen fertilizer plant that produced synthetic ammonia and urea from refinery off-gases. In March 2008, Qilu Yihua underwent a strategic restructuring with Shanxi Yangquan (Coal Industry) Group Co., Ltd., becoming part of Yangmei Group. At present, Qilu Yihua’s production process uses smokeless lump coal as raw material and relies on the traditional fixed-bed batch gas production method; the scale of production is small. The fertilizer production facility ceased operations on July 12, 2017. It was a gas generation and purification unit designed to support the production of butyl and octyl alcohols, and it employed traditional fixed-bed batch gas production techniques as well as wet desulfurization processes. This resulted in high production costs, as well as significant safety and environmental issues. Although the company continues to invest in improvements, certain problems remain difficult to resolve due to the inherent limitations of the existing technology, posing a serious threat to the company’s survival. Moreover, Shandong Province has required that 90% of fixed-bed batch gasifiers with a diameter of less than Φ3000 be phased out by 2022; therefore, it is urgent to carry out technical upgrades to Qilu Yihua’s 45,000 Nm3/h syngas production facility. The proposed project uses coal as raw material. It replaces the existing fixed-bed batch gas production process with pressurized gasification of coal slurry (using Beijing Qingchuang Jinhua Technology Co., Ltd.’s coal slurry water-cooled wall waste boiler gasifier – Jinhua Furnace 3.0 technology), and replaces the current wet desulfurization and PsA carbon removal processes with low-temperature methanol washing for purification. For the recovery of acidic gases, the wet acid production method is employed instead of the current batch sulfur melting recovery process. Additionally, two 85 t/h boilers that burn a mixture of waste gases are to be converted into circulating fluidized bed coal boilers, with a small amount of waste gases from storage areas and process emissions being used as fuel. The corresponding dust removal, desulfurization, and denitrification equipment will also be modified, while the 6 MW steam turbine generator set will remain in use. The newly installed production units include: an air separation unit, a water-coal slurry gasification unit, a CO conversion unit, a low-temperature methanol washing purification unit, a PSA hydrogen production unit, and a sulfur recovery unit. The existing ammonia synthesis, urea production, and Units 1# and 2# waste heat recovery units were removed, while the existing systems for coal storage and transportation, Units 3# and 4# waste heat recovery units, circulating water, chemical water treatment, sewage treatment, and power transformation were upgraded and reused. As a result, an effective synthetic gas production capacity of 45,000 Nm3/h was achieved.