新闻资讯
Xu Kuangdi: When conducting project reviews and expert voting, disruptive technologies are often lost

Xu Kuangdi: When conducting project reviews and expert voting, disruptive technologies are often lost

17 Aug,2016

Xu Kuangdi, an academician of the CAE Member, attended the international high-end forum of "2035 Development Strategy of Machinery and Transport Engineering Science and Technology" held in Shanghai University this morning and made a keynote report, and talked about his personal opinion: "disruptive technology, such innovation is difficult to achieve under the current administrative approval and review system.

Environmental protection theme public service announcement Air Pollution

Environmental protection theme public service announcement Air Pollution

09 Aug,2016

Ministry of Environmental Protection: "Improving Environmental Quality and Promoting Green Development: More than 4800 Projects Included in the Central Reserve of the 2016 Water Pollution Prevention and Control Action Plan"

Ministry of Environmental Protection: "Improving Environmental Quality and Promoting Green Development: More than 4800 Projects Included in the Central Reserve of the 2016 Water Pollution Prevention and Control Action Plan"

08 Aug,2016

In order to implement the important deployment of the State Council to promote the implementation of major projects, the Ministry of Environmental Protection has recently completed the construction of the Central Project Reserve for the 2016 Water Pollution Prevention and Control Action Plan, as well as the overall implementation plan for ecological environment protection of 15 lakes with better water quality approved by the provincial people's government, including the Liujiaxia Reservoir in Gansu Province and the Sanxian Lake in Hunan Province, as well as the Xiangtan City in Hunan Province The implementation plans for water pollution prevention and control in 103 cities, including Guang'an City, Sichuan Province, that meet the conditions for central reserve storage, were included as the first batch of projects, involving over 4800 specific engineering projects with a total investment of over 430 billion yuan.

习近平眼中的环保短板

习近平眼中的环保短板

07 Aug,2016

【学习进行时】从海南三亚到云南洱海，从京津冀区域到长江经济带，生态环境保护时刻牵挂在习近平总书记心中。绿水青山，碧海蓝天。生态环境关系民生福祉， 环境保护更需要全社会共同努力。在习近平总书记眼中，如何克服环保短板？如何平衡环境保护与经济发展的关系？新华网“讲习所”今天推出《习近平眼中的环保 短板》。

Purification and treatment of organic waste gas

Purification and treatment of organic waste gas

22 Mar,2019

1 Adsorption method The adsorption method is to reduce air pollution by passing organic waste gas through a packed bed filled with adsorbent to adsorb organic substances. The key lies in the performance of the adsorbent used, and high-performance adsorbents should have characteristics such as large adsorption capacity, uniform adsorption pore size, and easy regeneration. Common industrial adsorbents mainly include activated carbon, activated carbon fibers, coke powder particles, molecular sieve zeolites, etc. Activated carbon is suitable for the adsorption and purification of VOCs in paint exhaust gas due to its dense microporous structure, large internal surface area, good adsorption performance, and stable chemical properties; However, when dealing with waste gas with a humidity greater than 60%, the adsorption effect will be significantly reduced; If there is no regeneration device, replacing activated carbon increases operating costs; If hot air regeneration is used, it is easy to cause ignition. Molecular sieves have characteristics such as high temperature resistance, non flammability, and strong hydrophobicity compared to activated carbon. They can be regenerated through hot air and also exhibit good adsorption performance for exhaust gases with a humidity not exceeding 90%. 2 absorption method is a purification method that utilizes the high solubility of VOCs in certain solvents in paint exhaust gas, and uses oil soluble solvents with high boiling points and low vapor pressure to absorb VOCs. The absorption method is divided into physical absorption and chemical absorption. In practical industrial treatment processes, physical absorption is generally used, and whether absorbents are cheap, easy to obtain, and harmless is a key issue to consider. He Luhong et al. used non ionic surfactant Tween-20 as the main surfactant, added auxiliary surfactant sodium dodecylbenzenesulfonate (SDBS) and auxiliary sodium chloride to form a composite aqueous solution absorbent for treating toluene based VOCs waste gas. The removal rate of toluene can reach 77%. Xiao Xiao et al. [26] compared the absorption effect of absorbents such as diethyl hydroxylamine, polyethylene glycol 400, silicone oil, edible oil, waste engine oil, and 0 # diesel on toluene exhaust gas through experiments, and found that under the same experimental conditions, diethyl hydroxylamine had a large absorption amount of toluene. Li Jialiang et al. [Experimental research found that 4% of 1,4-butanediol (BDO) It has good absorption effect on toluene exhaust gas, with a high absorption concentration of up to 43.87mg/L. In addition to physical absorption, alkali or acid solutions such as sodium hydroxide and sodium hypochlorite are also used in industrial production as absorbents for chemical absorption of waste gas. The combustion method of 3 combustion is to burn and oxidize organic substances in paint exhaust gas, converting them into harmless substances such as CO2 and H2O to achieve the purpose of exhaust gas purification. The combustion method can be divided into direct combustion method, thermal combustion method, catalytic combustion method, thermal storage combustion method, and other types. (1) The direct combustion method should be used for high concentration combustible organic waste gas. The direct combustion method requires a sufficiently high temperature and sufficient oxygen in the combustion space. If the oxygen content is insufficient, the combustion is incomplete; If there is too much oxygen, the concentration of combustible materials will not be within the ignition limit, leading to incomplete combustion. To prevent gas explosion, waste gas is generally burned in boilers or open burners, with a combustion temperature of 1100 ℃ higher; But when combustion is incomplete, it can cause some pollutants and smoke to be discharged into the atmosphere, and the heat generated by combustion cannot be recovered, resulting in fuel energy loss. (2) The thermal combustion method can be used to treat low concentration combustible organic waste gas. Low concentration flammability

Experts from the Ministry of Ecology and Environment Interpret National Emission Standards

Experts from the Ministry of Ecology and Environment Interpret National Emission Standards

22 Mar,2019

In order to implement the Environmental Protection Law of the People's Republic of China and the Air Pollution Prevention and Control Law of the People's Republic of China, prevent and control air pollution from diesel vehicles, gasoline vehicles, and non road mobile diesel machinery, and resolutely win the battle of blue sky defense and the battle of diesel truck pollution control, The Ministry of Ecology and Environment and the State Administration for Market Regulation recently jointly released three national pollutant emission standards: "Limits and Measurement Methods for Pollutant Emissions from Diesel Vehicles (Free Acceleration Method and Load Deceleration Method)", "Limits and Measurement Methods for Pollutant Emissions from Gasoline Vehicles (Dual Idle Method and Simple Working Condition Method)", and "Limits and Measurement Methods for Smoke Emissions from Non road Mobile Diesel Machinery". Experts from the Ministry of Ecology and Environment answered reporters' questions on relevant issues. 1. What is the background for the release of the three national standards? What is the significance and role of winning the battle for blue sky defense and the battle for diesel truck pollution prevention and control? Answer: The current national air pollutant emission standards for diesel and gasoline vehicles in use were issued and implemented by the former State Environmental Protection Administration and the State Administration of Quality Supervision, Inspection and Quarantine in 2005, and have been in effect for over 13 years now. The current situation of air pollution prevention and control in China has undergone significant changes. Since 2005, the number of motor vehicles in China has grown rapidly. As of the end of 2017, the total number of motor vehicles in China had reached 310 million and 217 million vehicles. The total emissions of four pollutants from motor vehicles are 43.597 million tons, including CO33.273 million tons, HC4.071 million tons, NOx 5.743 million tons, and PM.509 million tons. From the analysis results of PM2.5 sources in many large and medium-sized cities such as Beijing, it can be seen that mobile sources such as motor vehicles have become the primary source of pollution. The emission structure of the vehicle fleet in use has significantly upgraded, with vehicles in the third or higher stage accounting for more than 90%. The current "Air Pollution Prevention and Control Law of the People's Republic of China" (hereinafter referred to as the "Air Law") puts forward new requirements for regular emission inspection, supervision and sampling, and supervision and management of in use vehicles. In recent years, the number and total power of non road mobile machinery in China have rapidly increased, making their contribution to atmospheric environmental pollution increasingly prominent. At present, China has a total of 7.2 million construction machinery and a total diesel power of 767.763 million kilowatts for agricultural machinery. In 2017, non road mobile machinery emitted a total of 2.909 million tons of SO2, 779000 tons of HC, 5.735 million tons of NOx, and 485000 tons of PM. The NOx and PM emissions of non road mobile machinery are close to those of motor vehicles, and the phenomenon of black smoke is very common.

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