Desulphurization core technology focuses on energy saving and emission reduction services for chemical industry and environmental protection


From September 20 to 22, the 10th Dongshi desulphurization Technology Exchange Meeting was held in Hangzhou. At the meeting, desulfurization technology experts and business representatives gathered to exchange views on the progress and development of desulfurization technology under the new normal of environmental protection. Industry experts said that although the desulphurization industry is small, it plays an important role in environmental protection, and the practical desulphurization technology displayed at the conference will provide better solutions for chemical enterprises currently worried about environmental impact assessment.

The core technology of enterprise gold mining draws attention

At this conference, experts from enterprises, associations and scientific research institutions such as Changchun Dongshi Science and Trade Industry Co., LTD., Taiyuan University of Technology, China Coking Association, Chemical Society of China Chemical Fertilizer Committee, etc. discussed the operational effects and economic benefits of various desulfurization technologies. Among them, the most attracted the attention of the participants, when the Dongshi display of DXY selective catalytic oxidation desulfurization new technology.

According to Wang Xiaomei, chairman of Changchun Dongshi Science and Trade Co., LTD., DXY desulfurization technology has passed the factory experiment, and built a set of industrial experimental equipment, after more than half a year of continuous operation, the indicators of the experimental equipment have reached or exceeded the design indicators, has the conditions for comprehensive promotion.

According to Bi Baokuan, deputy general manager of Changchun Dongshi Company, the new technology of DXY desulfurization is that H2S is directly oxidized to elemental sulfur under the action of DXY catalyst, which is the core of its technology, and then the elemental sulfur is separated from the gas by a special sulfur capture device, so as to achieve the purpose of removing H2S. This method is more advanced and applicable than the Klaus method which is widely used in China. Through the DXY desulfurization process, the purification degree of gas with different sulfur content can reach 30ppm or less, and the minimum can reach 2ppm. By further improving the catalyst, the technical team of Dongshi Company can adapt the process to the gas with H2S content of 1000~100000ppm, and the H2S transformation can be completed in one step. Because the reaction is exothermic, when the H2S content is above 0.5%, no external heat is required, and the energy consumption of the device is low. H2S content above 1.0%, that can be by-produced steam. When H2S content is above 3.0%, the reformer can directly produce steam. Tons of ammonia can save 12 ~ 20 yuan. Used in low temperature methanol washing acid gas desulfurization, the consumption cost of tons of ammonia catalyst is 0.1 ~ 2 yuan (related to the sulfur content of raw gas). Compared with traditional Klaus desulfurization, the investment can be saved by about 50%, and the operating cost can be saved by about 50%.

At the meeting, experts and teams such as Miao Maoqian, professor of Taiyuan University of Technology, Dongshi Technology Research and development Center, and Ji Guangxiang, chief engineer of Anyang Iron and Steel Group, also introduced to the delegates the technical points of general concern in the industry such as carbon fiber desulfurization, carbon dioxide recycling and recycling, wet oxidation desulfurization and regeneration technology, and exhaust gas control of desulfurization and regeneration tower of coking plant.

Industry feedback experience AC grounding gas

Song Zhili, executive president of Shanghai Hongli Purification Technology Co., LTD., who participated in the meeting, said: "This desulfurization technology exchange will change the mode of traditional exchange conference and product release in the chemical industry, so that the representatives of the meeting can discuss problems, introduce experience, and explore solutions. There are more dry experiences and great reference value, and it is also conducive to direct communication and negotiation with potential customers."

Representatives of relevant enterprises had face-to-face in-depth exchanges with Changchun Dongshi Company, and discussed the practical feasibility of the new DXY desulfurization process in their own factories, hoping that the technology would go steadily in industrialization. At the same time, they also communicated with the most concerned issues such as the transformation of existing devices and the economic cost of operation, hoping to find the most direct and effective solution for desulfurization and denitrification of enterprises.

Cao Pijiang, president of the China Coking Association, said that desulfurization has become a technical link of special concern in the coking field. The desulfurization technology introduced at this conference, both practical and economic, just in line with the coking industry in the degree of purification to meet the environmental assessment and downstream production requirements, stable and reliable operation, but also low cost development requirements, very grounded gas.

Wang Wenshan, deputy chief engineer of the former Ministry of Chemical Industry, said that he very much appreciated the Dongshi desulphurization technology Cooperation Network that organized investigations and studies before each meeting to understand the desulphurization situation and the main problems of the desulphurization unit, which played a vital role in the technical exchange of the industry.

Ten years of progress in energy conservation and emission reduction contributed greatly

Since 2005, Dongshi desulphurization technology Exchange Conference has been held for ten sessions, it can be said that the conference and desulphurization industry are growing together.

In terms of desulfurization equipment, Dongshi Company has made a number of improvements to QYD desulphurization internals, forming a series of products with better performance and stronger applicability.

Nano-ceramic membrane technology is introduced into the sulfur foam filter, which makes the separation rate of elemental sulfur reach 99.9% and improves the separation automation level. The injector with self-closing valve reduces the harm to the operator and the environment. The liquid level adjustment system of the regeneration tank realizes the manual remote control of the liquid level and visibility. The personalized liquid distributor is designed and manufactured according to different working conditions, so that the size and number of holes can be customized according to the working conditions to meet different needs.

In the desulphurization method, the distributed crystallization method avoids the introduction of new substances and the destruction of the para-salt components, and uses the distributed crystallization method to purify the para-salt in the desulphurization waste liquid, and the purity of the product can reach the industrial standard. Freezing enrichment method has the advantages of low energy consumption and high quality. In addition to concentration, it can also be used for the treatment of organic wastewater and the recycling of active substances. At the same time, the whole ice crystal is a good cold source for cold storage and cooling. Active coke adsorption desulfurization and denitrification has the advantages of high removal efficiency, high purity sulfur (99.95%) or concentrated sulfuric acid (98%) or high purity liquid SO2 as a by-product, and low power.

In terms of desulfurization catalyst, we have successively developed and studied modified active coking, modified molecular sieve, special catalyst 888-JH, DXY selective catalytic oxidant, etc., which has gradually developed into the mainstream catalyst for desulfurization in the market, providing technical support for waste emission and product purity improvement in chemical production.

Xu Jingpan, senior advisor of the Chemical Fertilizer Professional Committee of China Chemical Society and deputy chairman of the Technical committee of the Dongshi desulphurization Technology Cooperation Network, pointed out in the summary of the meeting that the technical team of Dongshi Company has made significant contributions to the progress of desulphurization technology in China for more than 10 years. The new DXY desulphurization technology introduced at this conference is more exciting to the industry, which will make China's desulphurization technology held high on the stage of the world's purification technology.

Wang Wenshan pointed out that the progress of desulfurization technology in the past 10 years cannot be separated from the attitude of practical research and development of enterprises, but also from the exchange of solidarity and mutual assistance of the whole industry. This technical exchange platform built by Dongshi Company has made great contributions to the development of the industry. In the next ten years, enterprises must be more united, strengthen exchanges, and better serve the chemical industry and environmental protection.

(Source: China Investment Advisory Network)