The “Technical Guidelines for the Development of Emergency Emission Reduction Measures for Key Industries in Heavy Pollution Weather” (hereinafter referred to as the “Technical Guidelines”) has received good social response since its release in 2019. The number of industries participating in performance grading has gradually increased. The key industries have expanded from the initial 15 to 39 large industries and 68 sub-sectors. The performance grading technical indicators have gradually been refined to make them closer to reality. Its purpose is to “encourage advanced, spur backward progress”, promote the transformation and upgrading of the whole industry, realize the fundamental transformation of the enterprise from the temporary treatment to the root cause, and promote the green and high-quality development of the enterprise. In July 2021, the Ministry of Ecology and Environment, based on the implementation of performance grading in the previous two years, is guided by problem solving, and after extensively soliciting opinions from local ecological and environmental departments, relevant industry associations and enterprises, the Ministry of Ecology and Environment The performance grading indicators and emission reduction measures of ten key industries including cement have been revised and improved, and supplementary explanatory documents have been issued.
It’s time for the key industry performance grading and evaluation in various places this year. What are the changes in the supplementary documentation of the “Technical Guidelines”? What are the main considerations? Which key industries, what performance indicators, and what control measures are involved? In order to facilitate local ecological and environmental departments and enterprises to understand policy changes at a glance and better carry out rating work, the Chinese Academy of Environmental Sciences, as the technical support unit, this time mainly focuses on coking, foundry, oil refining and petrochemical revised “Technical Guidelines”. The industry has been sorted out and cleared up doubts.
Reason for the change: During the implementation process, it was discovered that some by-product production workshops contained a small amount of waste gas related to VOCs. Failure to collect will cause obvious odors in the workshop and the plant area. In order to encourage A-level enterprises to further improve their awareness of unorganized odor control and promote the improvement of the level of refined management and control of A-level enterprises, this part of the gas has low concentration, high oxygen content, and low calorific value, and can be treated by efficient combined processes such as adsorption/absorption method. , Solve the problem of peculiar smell. Therefore, the coking industry has added this indicator to the pollution control technical indicators, which also reminds coking companies that it is not recommended that this part of the gas be introduced into the negative pressure system for recovery, which may pose a greater safety risk.
Reason for change: The “Comprehensive Treatment Plan for Volatile Organic Compounds in Key Industries” issued by the Ministry of Ecology and Environment in 2019 puts forward the governance requirements for the VOCs industry, promotes the construction of suitable and efficient pollution control facilities, and implements dual control of the emission concentration and removal efficiency of key emission sources ( If the initial VOCs emission rate is greater than or equal to 3 kg/hour, and the key areas are greater than or equal to 2 kg/hour, treatment facilities shall be installed and the removal efficiency shall not be less than 80%). In the casting industry’s pollution control technology performance grading indicators, the coating process only puts forward the requirements for the use of efficient treatment facilities for the use of solvent-based raw materials, but does not specify the removal efficiency; for the use of water-based coatings or advanced spraying technology, it is mentioned that Class A enterprises use activated carbon Adsorption, B and C level enterprises do not have requirements (that is, no treatment facilities are set up), which means that neither treatment facilities nor removal efficiency are strictly regulated; the performance grading index emission limits do not have the same treatment as the industrial coating industry. The relevant limits of VOCs for different performance levels are stipulated, which are generally looser than the requirements in the “Technical Guidelines” for the industrial coating industry. Therefore, the supplementary description of the “Technical Guide” combines the characteristics of the coating process in the foundry industry to specify the NMHC and TVOCs emission limits for the coating process, which is consistent with the corresponding level requirements of the industrial coating industry.
Reasons for change: At present, domestic and foreign flare gas recovery methods are mainly divided into two types: raw material type and fuel type. Which recovery method to choose is determined according to actual needs and comprehensive consideration of economic and environmental requirements. The investigation found that some petrochemical companies have relatively simple raw and auxiliary materials, and the amount of waste gas generated by the operating conditions is less, and the current pipeline volume of the company can meet the requirements of temporary waste gas storage. This type of enterprise flare system does not require flare gas. For the recycling and utilization, there is no need to set up a gas tank and compressor, that is, the flare discharge system mainly burns the combustible gas discharged during normal production and accident conditions. At the same time, the refining process has a large amount of organic waste gas and many pollution-producing links. In order to maximize the recycling of the combustible gas emitted during the normal production process in the refining area, it can save energy, reduce costs, and protect the environment. According to the concentration of organic waste gas, A suitable flare gas recovery process can be selected. Considering that the overall components of the refining flare gas are too complicated and it is difficult to separate and extract one of the components, the gas holder-compressor flare recovery process can be used to finally recover the combustible gas It is sent to the fuel gas pipeline network of the whole plant. Therefore, the torch mentioned here specifically refers to the torch of the oil refining unit.