Which design institute developed the 15MPa low-pressure ammonia synthesis process for Shandong Lianmeng Chemical?
Thread Content
The Shandong Alliance 40-60 project upgrades the conventional fixed-bed batch gas production process by employing space powder gasification, low-temperature methanol washing, and liquid nitrogen washing technologies. In addition, the pressure swing adsorption process will also be used to purify H2 from the raw gas used in low-temperature methanol washing, in order to produce hydrogen for use as vehicle fuel. The project is scheduled to go into operation in 2023. The 40.60 Project Clean Production Technology Upgrade Project involves modifying only the ammonia synthesis section of the existing “40.60” Project; upon completion of the upgrades, the annual production capacity of ammonia will remain at 400,000 tons, urea at 600,000 tons, and methanol at 200,000 tons. Following the technical upgrade, the gas production process was changed from a fixed-bed batch method to a pressurized coal gasification process ； The original 2 sets of desulfurization units, 3 sets of shift units, 2 sets of shift gas desulfurization units, 2 sets of PSA pressure swing adsorption decarburization units, and 2 sets of high-pressure alcohol alkylation units were replaced by 1 set of isothermal shift unit, 1 set of low-temperature methanol washing unit, and 1 set of liquid nitrogen washing unit respectively ； The ammonia synthesis process has been changed from 2 sets of high-pressure synthesis units to 1 set of low-pressure synthesis unit, with the operating pressure reduced from 22 MPa to 15 MPa ； Complementary air separation units and waste gas treatment units are to be installed.
Following a two-year construction period, Shandong Lianmeng Chemical Co., Ltd.’s “Coal Clean and Efficient Utilization Transformation Project”, which was upgraded two years ago, was officially put into operation recently. The process software package for the DC-type ammonia synthesis system, provided by Nanjing Jutuo Chemical Technology Co., Ltd., along with the patented DC-D-type ammonia synthesis tower, have been successfully put into operation, with the production volume and product technical specifications meeting the required standards from the very beginning. At present, the hourly ammonia production exceeds 80 tons, the ammonia purity is over 18.3%, the tower resistance is less than 0.25 MPa, and the system pressure is below 13.0 MPa. It has set the current record for the operation of ammonia synthesis systems.
I have been to visit Jutuo’s ammonia synthesis facility, and its operation is going well
The new 600,000 tons/year ammonia synthesis system at Donglian Union has been successfully commissioned. Author/Source: Modern Coal Chemical Industry. Date: November 19, 2019. Clicks: 122. After a two-year construction period, Shandong Lianmeng Chemical Co., Ltd.’s “Project for Clean and Efficient Utilization of Coal” was officially put into operation recently. Good news has come from the Shandong Lianmeng site today: The DC-type ammonia synthesis system software package provided by Nanjing Jutuo Chemical Technology Co., Ltd. for this project, along with the patented DC-D-type ammonia synthesis towers, have been successfully deployed, and both the production volume and the technical parameters of the products meet the required standards from the very beginning. At present, the hourly ammonia production exceeds 80 tons, the ammonia purity is over 18.3%, the tower resistance is less than 0.25 MPa, and the system pressure is below 13.0 MPa. It has set the current record for the operation of ammonia synthesis systems. The image shows the DC-type ammonia synthesis system. It also shows a screenshot of the DCS interface at 95% load. This technology is another set of key technologies and core equipment with independent intellectual property rights, developed by Nanjing Jutuo Company through its long-term commitment to innovation and continuous research; it builds on the expertise and experience gained from implementing various ammonia synthesis process systems in China. The ammonia synthesis reactor in the system was entirely designed independently. The patented design incorporates innovative process and equipment structure concepts during manufacturing; the process makes use of indirect and efficient heat exchange, parallel heat diversion for temperature regulation, as well as quasi-radial gas flow ； Structurally, it mainly adopts a “three-bed four-section” catalyst basket, a split design, and a bottom-discharge catalyst structure ； The tower adopts a structural design and manufacturing process based on the advanced concept of forced heat transfer using impact rod high-efficiency heat exchange tubes; the catalyst basket walls utilize a multi-layer catalyst retention technology. High materials resistant to hydrogen corrosion are used, along with a special design tailored to the characteristics of domestic catalysts. Precise manufacturing processes are employed to continuously improve product quality, resulting in the desired outcomes and complete success.
Are all the equipment domestically produced, especially the compressors?
I can’t remember clearly; it should be domestically produced
Contents of the renovation project: Construction of 2 space furnaces for gasification. The model is φ3200/3800. Process 3,000 tons of coal per day (on a dry basis). The gasification furnace load is 76.06% (the remaining load is reserved for subsequent projects of the Alliance Group, with separate environmental impact assessments to be conducted for those projects). The conversion is carried out using a Co-Mo-based conversion catalyst and an isothermal conversion process. Two sets of isothermal conversion units will be constructed, with the diameter of the conversion furnace being φ3600. Low-temperature methanol washing includes processes such as desulfurization and decarbonization, CO2 desorption, H2S concentration, and methanol thermal regeneration. Construct 2 methanol wash absorption towers, 1 CO2 desorption tower, and 1 methanol thermal regeneration tower. Gas purification uses liquid nitrogen washing. Install 1 nitrogen scrubber tower. Ammonia synthesis employs a low-pressure synthesis process of 15 MPa. One set of φ2800mm ammonia synthesis towers is installed, with an ammonia synthesis production capacity of 400,000 tons per year. The internal structure of the ammonia synthesis tower is of the “three beds, four sections, quasi-full radial layer, interstitial heat exchange” type. Methanol synthesis produces methanol through the combined production process of hydrogen-rich off-gas and raw gas for low-temperature methanol washing. Lixiu currently has 2 100,000-ton/year low-pressure methanol synthesis units, and it has phased out the high-pressure methanol synthesis and alkylation units. The air separation process employs an internal compression air pressurization cycle expansion scheme. Air is frozen and separated into liquid oxygen and liquid nitrogen; at the same time, the argon in the air is also frozen to become liquid argon. The oxygen production capacity through air separation is 55,000 m3/h.
I was involved in the installation in 2012; the synthetic ammonia process is Polytop’s process package.
The locally produced process packages – 1111 likes! This ensures that there will be no problems with food supply. Are those compressors and synthesis towers also of domestic manufacture?
The cycle compressor is of domestic manufacture; I can’t remember which company produced it. It is equipment supplied by the client. The internals of the synthesis tower were designed and manufactured by Jutuo, while the casing was produced in Changzhou.
This post was last edited by zhouyuxuan1212 on 2022-5-17 15:34; it’s been too long