"Fluidized bed granulation drying technology" reached the international advanced level

On April 26, 2013, the China Petroleum and Chemical Industry Federation hosted in Beijing a large-scale continuation of near-zero discharge of biological fermentation waste liquid jointly completed by Shandong Aoyuanyuan Technology Co., Ltd. and COFCO Biochemistry (Anhui) Co., Ltd. Fluidized Bed Granulation Drying Complete Technology" project scientific and technological achievements appraisal meeting.

meeting venue

Attendance at the appraisal session included the deputy chairman of the China Mechanical and Power Technology Association/Professor-level senior engineer Du Ronglin, deputy dean of the Liaoning Light Industry Design Institute/professor-level senior engineer at the Signaling Department, and president/professor of the High-tech Research Institute of Beijing University of Chemical Technology. Yixin Xin, Director/Professor of Agricultural Engineering Department of China Agricultural University Liu Xiangdong, Shenyang Institute of Chemical Industry/Gaogong Liu Guangwen, Dean/Professor of School of Mechanical Engineering of Tianjin University of Science and Technology Li Zhanyong, Tianjin University/Professor Yang Junhong and Information Office of China National Chemical and Economic Technology Development Center Chang Hua, Chang Lili, Deputy Director of the Technical Equipment Office of the China Petrochemical Federation, Guo Anqiang, Chairman of Shandong Aonuoyuan Technology Co., Ltd., Chief Engineer Niu Hu, and Deputy General Manager Li Dongdong of COFCO Biochemistry (Anhui) Co., Ltd. attended the meeting.

With the rapid development of biotechnology and the rapid expansion of production scale, the environmental pollution of industrial wastewater has become increasingly prominent. According to statistics, light industrial wastewater accounts for 65% of China's total industrial wastewater COD emissions, of which the discharge of fermentation wastewater is second only to the paper industry. The waste water pollution source of the fermentation industry is mainly high-concentration organic waste water. These high-concentration organic waste waters have the following common features: First, the concentration is high, COD is usually 4-8×104 mg/l, and the second is large emission, generally 15-20 m 3 / t product; third is non-toxic and nutritious. Due to the large volume of fermented liquid waste, the difficulty of processing and the high processing cost, the developed countries such as the United States, Japan, and Europe have basically stopped producing bio-fermentation products at home. Instead, they have transferred factories to developing countries such as China and Southeast Asia. The total production of lysine and lysine accounts for about 75% of the world's total production. Therefore, the energy conservation, emission reduction, clean production, and resource utilization of the biofermentation process are listed as important areas for technological progress in the national “Eleventh Five-Year” and “Twelfth Five-Year” plans.

Biofermentation Industrial production usually uses a refining process to extract the active ingredients from the crude fermentation broth. The remaining fermentation waste liquid is rich in bacterial protein, amino acid, polypeptide, residual sugar and other nutrients, and the components are complex. The concentrated fermentation waste liquid exhibits high viscosity, strong moisture absorption, easy agglomeration, and low denaturation temperature during the drying process. It is difficult to adopt conventional drying methods such as spray drying to achieve resource recycling. Usually, high-temperature drum pelletizers are used to make bio-compound fertilizers, or industrial wastewater is used as an end-of-pipe treatment technology to treat wastewater, and even discharged directly into the sea. In rivers and rivers, serious environmental hazards, waste of resources, and increased production costs are caused. Therefore, wastewater pollution has become a limiting factor in the further development of the fermentation industry.

Based on the problems faced by the bio-fermentation industry, this research group started the research on the topic of “complete continuous fluidized bed granulation and drying technology for near-zero discharge of biological fermentation waste liquid”. In the research and engineering application of this topic, combining fluidized drying with spray drying, through the study of material suitability, technological research, and the technical study of the main structure of the granulation bed, it has been successfully developed for crude fermentation broth and crude fermentation. Liquid and fermentation waste liquid preparation, fermentation waste liquid and other biological fermentation broth large-scale continuous fluidized bed granulation drying technology.

Taking lysine, threonine and tryptophan as examples, when used as an additive for animal feeds, there is sometimes no need for refining, if crude fermentation broth, or crude fermentation broth and fermentation effluent produced during refining are used Concentration and drying of the blending solution directly to obtain a feed additive with a lower content of active ingredients can completely avoid waste liquid production, achieve near-zero emission of fermentation waste liquid, and greatly reduce the negative impact on the environment, while the fermentation by-products All nutrients are recycled. If a large continuous fluidized bed granulation drying kit is used for the granulation and drying of glutamic acid fermentation waste (MSG waste liquid) to prepare organic compound fertilizer, all the drying processes are completed under low temperature conditions, and the dry exhaust gas is not Contamination avoids the problem of secondary air pollution from traditional high-temperature drum granulators.

This technology directly sprays, pelletizes, and dries the biological fermentation liquor in a fluidized bed to obtain a granular product in one step, thereby realizing near-zero emission of the biological fermentation waste liquid.

The successful application of this project not only realizes the clean production of biological fermentation process and the utilization of biological fermentation waste liquid, but also saves a lot of energy for users, and has significant economic and social benefits. Since 2008, Shandong Aonuo Energy Technology Co., Ltd. has promoted 27 sets of complete sets of devices in 65% lysine, low-content threonine, low-content tryptophan, salinomycin, and biofermented protein. The new production value of 8.77 billion yuan, profits and taxes of 1.7 billion yuan, to achieve near zero emissions of wastewater in the biological fermentation process, reduce emissions of 235 × 104m3 / h, save steam consumption 800,000 tons / year, and achieved remarkable economic benefits and Social and economic benefits.

Take COFCO Biochemistry (Anhui) Co., Ltd. as an example of the "65% Lysine Cleaner Production Demonstration Project." Prior to the production of 98.5% lysine hydrochloride using a single purification process, the post-fermentation treatment process includes membrane filtration, ion exchange, and neutralization crystallization. The amount of fermentation waste to be treated is large, and a large amount of energy is required to process the waste liquid. Consumption and equipment investment have greatly increased the production cost of 98.5% lysine and restricted the development of 98.5% lysine. After the “65% Lysine Clean Production Demonstration Transformation Project” was implemented, the traditional 98.5% lysine hydrochloride was developed through the development of a large-scale continuous fluidized bed granulation drying technology and the mature application in lysine production. The above problems in the production process have been systematically and thoroughly solved.

If this technology is used to monolithically produce 65% lysine sulfate, the crude fermentation broth is treated with sulfuric acid and then directly concentrated, granulated and dried, and no separation, crystallization, etc. are required, and no high-concentration organic waste liquid is produced in the production process. , that is, to achieve clean production, but also can save the consumption of hydrochloric acid, resins and other accessories, effectively reduce production costs, while increasing the utilization of fermentation products, the full retention of nutrients. When the 65% lysine sulfate is combined with the 98.5% lysine hydrochloride process, the fermented waste liquid produced in the lysine hydrochloride process is directly concentrated, granulated, and dried together with the crude fermentation liquid. 65% lysine sulfate was obtained, which reduced the amount of waste water discharged, reduced the consumption of raw materials, achieved near-zero discharge of high-concentration wastewater during lysine production, and achieved clean production.

Participating experts listened to work reports, technical research reports and corresponding reports. They reviewed the relevant technical data. After questioning and discussion, they formed the following identification opinions: This project achieved biological fermentation waste through research on material suitability, process research, and device structure. Near-zero discharge of liquids, the specific innovations are as follows:

(1) The large-scale continuous fluidized bed granulation and drying complete sets of technologies have been successfully applied to the drying of biological fermentation broths such as crude fermentation broth, crude fermentation broth and fermentation effluent, fermentation effluent, and the like, which solves the problem of low density and strength of the product. , Easy to absorb moisture problems, to achieve a high rate of granulation, continuous operation, the resulting product has dense particles, high strength, good sphericity, easy to absorb moisture, good dispersion characteristics, to fill the gaps in the country;

(2) Through the application of a number of patented technologies, the large-scale and continuous fluidized-bed granulation dryers have been realized, which greatly reduces exhaust emissions and reduces steam consumption.

This technology is not only suitable for the granulation and drying of biological fermentation broth, but also can be widely used in pharmaceutical, food, environmental protection, chemical and other fields. With the in-depth development of the technology and market of this project, its application and scale will continue to expand.

The successful implementation of this technology is of great significance in promoting the clean production, energy saving and emission reduction, and resource utilization of the fermentation industry.

The appraisal committee unanimously held that the overall technology of this achievement has reached the international advanced level.