Rongxin Chemical uses evaporation crystallization system to produce industrial salt to achieve zero emissions
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Recently, the evaporation and crystallization system of the second phase of the reclaimed water reuse station of Ordos Nenghua Rongxin Chemical Industry of Shandong Yankuang Group has successfully opened up all processes and successfully produced sodium sulfate, achieving "zero discharge" of industrial wastewater in the true sense. This system can combine the concentrated high-salt wastewater (20 cubic meters per hour) in the first phase with the sewage and salty wastewater in the second-phase production system. Through multi-effect evaporation combined with freezing crystallization and other technologies, it can be converted into production water and industrial salt that directly creates economic benefits. It is reported that the system can process 44.63 cubic meters of high-salt wastewater per hour, recover 1.5 tons of anhydrous sodium sulfate product salt, and 2.05 tons of sodium chloride product salt. The company can save 7 million yuan in sewage charges, 4.3 million yuan in water bills, and recycle about 21,000 tons of industrial salt every year, highlighting environmental and economic benefits. The company invested 36.8 million yuan in the first phase of the project to build a set of high-concentration brine concentration equipment, which reduced the discharge of high-concentration brine from 133 cubic meters per hour to 10 cubic meters, with a reuse rate of more than 90%, achieving "near-zero emissions." The successful operation of the second-stage evaporation and crystallization system has achieved "zero discharge" of industrial wastewater in the true sense, and has accumulated valuable experience for the research and development of wastewater treatment, environmental protection and energy conservation projects in the coal chemical industry.
Rongxin Chemical's 400,000 tons/year coal-to-ethylene glycol and 300,000 tons/year polymethoxydimethyl ether projects produce qualified products. Recently, good news came from Inner Mongolia Rongxin Chemical Co., Ltd. that the gasifier of the company's annual coal-to-ethylene glycol and 300,000 tons/year polymethoxydimethyl ether circular economy demonstration project, built by China Chemical Engineering No. 4 Construction Co., Ltd., successfully put into the gasifier once and produced qualified products. Rongxin Chemical's ethylene glycol and polymethoxydimethyl ether project is located in Sanyangliang Industrial Park, Dalat Banner, Ordos City, Inner Mongolia. It is a project accelerated by Ordos City. * * An important project implemented by the modern coal chemical industry demonstration base. The project uses coal as raw material and adopts the four-nozzle gasification technology of East China University of Science and Technology to produce CO and H2 required for ethylene glycol, as well as the synthesis gas required for methanol synthesis. Ethylene glycol is synthesized through an indirect method, and DMMn is synthesized through an indirect method from methanol. Sihua Construction undertook the coal preparation boundary area of the gasification device and the installation of the sulfur recovery device of the project. Since the start of construction on September 5, 2018, the company's construction personnel have carried forward the spirit of hard work, unity and hard work, overcome difficulties, rushed to progress, and maintained nodes. After one year of construction, the project construction was completed on schedule, ensuring the smooth launch of the project. Rongxin Chemical Co., Ltd. received a letter of thanks from Rongxin Chemical Co., Ltd.
This post was last edited by Yuyu in the Desert on 2020-6-6 12:51
On May 1, the evaporation and crystallization system of the reclaimed water reuse station of Yankuang Rongxin Chemical's ethylene glycol and DMMn project, contracted by China Chengda, produced sodium chloride with a purity of 98.5%, marking the completion of the entire reclaimed water plant process and achieving zero discharge of industrial wastewater throughout the plant. The system has a design scale of 1,200m3/h. It uses a number of leading international and domestic technologies such as high-efficiency reverse osmosis membrane concentration, high-pressure nanofiltration salt separation, and nitric recrystallization to recover industrial sodium sulfate and sodium chloride from the high-salt wastewater discharged from the upstream system of the factory. All indicators have reached the leading domestic level. This system solves the problem of environmental pollution caused by factory wastewater discharge. While recycling product salt, the recycled water can be used as replenishing water for the circulating water system or desalted water, saving primary production water consumption and creating economic benefits for the owners. The completion and operation of this project will serve as a demonstration for the industrial application of zero wastewater discharge and crystalline salt resource utilization technology in the domestic chemical industry.
In the first phase of Rongxin Chemical, a set of high-concentration brine concentration equipment was built (the concentration reached more than 60,000 mg/L), which reduced the discharge volume of high-concentration brine from 133m³/h to 20m³/h. After the operation of the evaporation crystallization and salt separation system of Rongxin Chemical Phase II reclaimed water station, the 20m³/h high-salt wastewater of the first phase and the high-salt wastewater of the second phase can be combined for treatment, ultimately achieving zero discharge of industrial wastewater. It is understood that the processing scale of the evaporation crystallization unit of this project is 44.63m³/h, of which the water volume of the sodium sulfate section (secondary NF concentrated water) is 13.72m³/h, and the water volume of the sodium chloride section (third-level RO concentrated water) is 30.91m³/h. The second phase of the 400,000-ton coal-to-ethylene glycol project of Rongxin Chemical is the first EPC general contracting project of Yankuang Group and the first coal-to-ethylene glycol project of Yankuang Group. The coal-to-ethylene glycol unit was successfully put into operation on December 28, 2019 and produced qualified products. It also became the first domestic coal-to-ethylene glycol project to be fully put into production in 2019.
Project introduction: Yankuang Group's Inner Mongolia Rongxin Chemical Co., Ltd. has an annual output of 400,000 tons of coal-to-ethylene glycol and 300,000 tons of polymethoxydimethyl ether projects. It is a project that Yankuang Group has accelerated. * * Another major project implemented by the modern coal chemical industry demonstration base. The project focuses on the "park-based, refined and high-end" development of the chemical industry, with a total budgeted investment of 7.68 billion yuan, and is scheduled to be completed and put into operation in 2019. Yankuang Group plans to build on the first phase of the Rongxin Chemical project and extend the coal chemical industry chain through large-scale construction of the second and third phases, eventually forming a coal chemical demonstration base with a production capacity of 5 million tons/year of coal-to-methanol and a series of downstream fine chemical products, creating a new business card for coal conversion and industrial upgrading. The project mainly produces 900,000 tons/year of methanol, uses the indirect method to produce 400,000 tons/year of coal-to-ethylene glycol, and uses part of the methanol as raw material for downstream DMMn to produce 300,000 tons/year of DMMn. The main construction contents of this project include coal gasification three 4000t/d coal-water slurry gasifiers (the coal input per furnace is currently the largest gasifier in the world), purification (CO conversion, low-temperature methanol washing, CO cryogenic separation, PSA hydrogen production), Sulfur recovery, 900,000 tons/year methanol unit, 400,000 tons/year ethylene glycol unit, 300,000 tons/year DMMn, 2×92000Nm3/h air separation, 2×380t/h high-pressure circulating fluidized bed boiler+2×20 Process production equipment such as MW pumped-back steam turbine generator sets, public auxiliary equipment, etc.
Rongxin Chemical uses an evaporation crystallization system to produce industrial salt to achieve zero emissions, and the project is doing well. I still want to ask: Is there anything else that could be improved on the project? Or a place that's not that perfect? Questions are what drive everything forward.
Evaporated salt degumming agent reduces the production of mother liquor, increases evaporation efficiency, and improves salt quality. For detailed consultation, please contact the senior manager of Kaifeng Hongyuan Water Treatment 13 403789439 WeChat number
1200m3/h？ The processing volume is too large. How to control the cost? The pretreatment unit must be upscaled, separated by quality and source, and the high-salt concentrated water entering the evaporator must be reduced as much as possible.
This is a great piece of technology, haha