[Ten years of development of chemical equipment] 657-2017 cracking furnace low-nitrogen burner renovation and localization
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This post was last posted by Yuyu in the Desert on 2022-12-12 22:57 The editor looks at the ten years of great development of chemical equipment and praises the prosperous China. Replies are rewarded and welcome to discuss. ----------------------------------------------- The first successful case of applying domestic low-nitrogen burners to control nitrogen oxide emissions from cracking furnaces. In March 2017, the low-nitrogen burner installed in the No. 5 cracking furnace of the Tianjin Petrochemical Ethylene Unit manufactured by Tianjin Jinbin Manufacturing Co., Ltd. After more than one month of continuous operation, the nitrogen oxide (NOX) emissions have always been lower than 80mg/m3.* * standard, which has reduced the average detection value by 50% compared with the average detection value before the transformation. It has successfully passed the environmental protection acceptance of the Tianjin Environmental Protection Bureau. It has become the first domestic successful case of applying domestically produced low-nitrogen burners to control nitrogen oxide emissions from cracking furnaces. It has achieved a new breakthrough in the successful transformation and application of low-nitrogen burners in domestic olefin cracking furnaces.
In 2017, the renovation of the low-nitrogen burners of the cracking furnace of the Yangzi Petrochemical Olefin Plant took more than a year of construction. On New Year's Eve of 2019, the No. 11 cracking furnace, the last cracking furnace of the Yangzi Petrochemical Olefin Plant, completed the low-nitrogen burner renovation and started ignition and heating. At this point, the renovation of the 14 cracking furnace low-nitrogen burners of the company's ethylene complex unit came to a successful conclusion. The completion of this project has effectively reduced the nitrogen oxide emissions of the ethylene cracking furnace, helped the ethylene cracking furnace meet emission standards and ultra-clean emissions, and achieved energy conservation and emission reduction. There are 14 in-service cracking furnaces in the ethylene combined unit of Yangzi Petrochemical Olefin Plant, which originally used bottom burners and side wall burners for combined heating. Due to the old design of the cracking furnace burner, the nitrogen oxide (NOx) emission standards when originally designed can no longer meet the current * * Environmental protection requirements, that is, nitrogen oxide emission values cannot be met * * The current emission limit value (not higher than 100 mg/standard cubic meter) required by the environmental protection department. The modification of the low-nitrogen burner of the cracking furnace of the ethylene combined unit mainly involves replacing the original bottom burner and side wall burner of the cracking furnace with low-nitrogen burners, and setting up the corresponding steam injection system and instrument control system. The steam injection method is used to meet the nitrogen oxide emission requirements and ensure that the nitrogen oxide concentration in the flue gas emitted by the cracking furnace under normal operating conditions is not higher than 80 mg/standard cubic meter. ； Under hot standby and burning conditions, the concentration of nitrogen oxides in the emitted flue gas shall not exceed 100 mg/standard cubic meter. This transformation involves 14 cracking furnaces and is a key transformation project of Yangzi Petrochemical. Since the second half of 2017, Yangzi Petrochemical Olefins Plant has comprehensively promoted the implementation of the low-nitrogen burner renovation project of the ethylene cracking furnace, taking the lead in carrying out the low-nitrogen burner renovation of the No. 3 cracking furnace. During the shutdown period of a single furnace for renovation, the adjacent furnaces are in normal production and operation, and are undergoing renovation and construction at the same time. The safety risks of on-site construction operations are high, and safety supervision is difficult and demanding. In conjunction with the renovation and construction of low-nitrogen burners in the cracking furnace, Yangzi Petrochemical Olefins Plant has reasonably arranged the switching plan for the cracking furnaces of one and two sets of ethylene units, and scheduled the shutdown time of a single furnace for renovation. ； Strictly control the transformation design confirmation, review and approval of the start-up plan, and on-site disclosure before construction, and promote the transformation construction in a planned, step-by-step, and phased manner to ensure the safety, quality, and progress of the entire cracking furnace low-nitrogen burner transformation. The furnace was successfully put into operation after the transformation, and the set goals of the transformation were achieved.
In 2017, Guangzhou Petrochemical's 6 cracking furnace burners underwent technical transformation of domestic low-nitrogen burners. On August 7, 2017, Guangzhou Petrochemical's ethylene cracking G furnace, which completed the technical transformation of low-nitrogen burners, was officially put into operation. The nitrogen oxide emission value was much lower than* * The latest environmental protection requirements. So far, the modification of low-nitrogen burners for seven cracking furnaces of Guangzhou Petrochemical has been completed. Before July 1, a total of six cracking furnace burners of Guangzhou Petrochemical AF had completed the technological transformation of domestic low-nitrogen burners. On July 1st, furnace G was shut down for the modification of the last furnace burner. In this modification, the heating ratio of the cracking furnace remained unchanged and was changed to stepped heating. ； The bottom burning position remains unchanged, and the opening at the bottom of the furnace is enlarged. ； The side burning is low-pressure methane, and a row of 16 boss side wall burners is installed in the middle of the radiant furnace. The new side burning holes are re-opened, the original side burning holes are sealed, and the side wall lining is modified. The operating data after the transformation shows that the burner is operating well, the heat load meets the design specifications, the furnace heat flux is reasonably distributed, and the NOx emissions are reduced by 48.8% year-on-year after the transformation. The overall technology has reached the international advanced level, and the energy saving and environmental protection benefits are significant.
2018 Zhenhai Refining and Chemical's million-ton ethylene cracking unit cracking furnace burner localization transformation On March 28, 2018, Zhenhai Refining and Chemical's million-ton ethylene cracking unit's key equipment for environmental protection improvement - the cracking furnace burner completed online debugging after the localization transformation. The data shows that the nitrogen oxide concentration of the export flue gas is far lower than* * The emission standards mark another major step forward in clean ethylene production and provide practical cases for other domestic cracking furnace flue gas low-nitrogen emission transformations. Previously, the side wall of the No. 2 cracking furnace used an imported semi-premixed burner, and the nitrogen oxide emission design indicator was 150 mg per standard, which was higher than * * emission standards. In this transformation, all 72 side wall burners were replaced with domestically produced burners, which have the advantages of relatively mature technology, short delivery period, fast on-site service response, and low investment. The domestic burner adopts staged combustion technology, which can ensure that the cracking furnace burns more evenly and the combustion temperature is not too high without changing the combustion load. ； It adopts a split design, that is, the air box and the combustion gun are separated. When disassembling, you only need to remove the combustion gun. The disassembly and assembly work is simple, light and convenient. Due to scientific and reasonable construction arrangements and timely and accurate adjustment of working conditions, it only took 5 days. Without disturbing normal production, the Zhenhai Refining and Chemical Olefins Department completed the replacement and reconstruction of 72 sidewall burners online. After testing, the environmental protection indicators of the cracking furnace have been significantly improved, and the nitrogen oxide emissions have been reduced from the original 98 milligrams per standard to 78 milligrams. The burner is operating well, and the environmental protection improvement effect is obvious. The domestic transformation of the first cracking furnace side wall burner has been a complete success. Next, the ministry plans to popularize and transform cracking furnaces one by one to further promote green development, environmental protection and emission reduction.
In 2019, the localization of Zhenhai Refining Nitrogen Burner. The localization of the burner is a "free trump card" for energy saving and consumption reduction of Zhenhai Refining and Cracking Furnace. At the end of 2019, Zhenhai Refining and Chemical's "Donghai Furnace King" team cooperated with the 11th Institute of Aerospace Science and Technology to complete the localization transformation of 1,244 sets of burners in 11 cracking furnaces. “By improving the gas spray gun and adjusting the combustion air ratio, the new low-nitrogen burner can obtain the best combustion parameters and achieve the goal of energy conservation and environmental protection. ”Jiang Mingjing introduced. According to the characteristics of different raw material cracking furnaces, the "Donghai Furnace King" team also worked with experts from 11 aerospace industry institutes to conduct in-depth discussions on the height, angle, and orientation of each group of burners, and tailor-made different transformation plans. The oxide emission concentration is more than 40% lower than similar products at home and abroad, and emission indicators such as nitric oxide have reached the international advanced level, marking a new breakthrough in the development of ultra-low nitrogen burners for heating medium furnaces. After all modifications are completed, each cracking furnace can reduce fuel gas consumption by more than 100 kilograms per hour on average.
In 2018, the low-nitrogen burner renovation of No. 4 furnace of Dushanzi Ethylene No. 1 United Workshop. The No. 6 furnace of Dushanzi Ethylene No. 1 United Workshop was scheduled to be shut down for maintenance on April 2, 2018. There were a total of 25 maintenance items. The main contents of the maintenance were the replacement of 48 bottom burners, 128 side burners and cracking furnace tube inspection. After replacing the low-nitrogen burner of the cracking furnace, it can not only effectively reduce the nitrogen oxide content in the flue gas, but also provide a strong guarantee for the high-load operation of the cracking furnace. In order to ensure the completion of the 6.30 million tons ethylene low-nitrogen burner renovation project of the ethylene plant as scheduled, the Ethylene No. 1 Joint Workshop regards the cracking furnace renovation project as the top priority of the year's work, scientifically coordinates and organizes it in an orderly manner, and makes every effort to follow the "four-character mantra" of "strictness, detail, practicality, and excellence". It collaborates closely with contractors to continuously optimize processes and effectively ensure the safe and efficient completion of the cracking furnace renovation project.
Qilu Petrochemical's 15 cracking furnace low-nitrogen burners were upgraded in 2018. In October 2018, Qilu Petrochemical's last cracking furnace low-nitrogen burner transformation successfully passed the acceptance inspection, marking the completion of the upgrade and renovation of Qilu Petrochemical's 15 cracking furnace low-nitrogen burners. The upgraded cracking furnace operates well and the cracking furnace flue gas emissions are qualified. In accordance with the requirements of the "Petroleum Refining Industry Pollutant Emission Standards", Qilu Petrochemical has increased efforts to control the content of nitrogen oxides and sulfur dioxide in the flue gas emitted from cracking furnaces, and has upgraded the low-nitrogen burners of 15 cracking furnaces in an orderly manner as planned. Since the company shut down for major overhaul in 2017, it has carried out low-nitrogen burner modifications on the cracking furnace of the ethylene unit. During the overhaul, it has completed the modification of 6 low-nitrogen burners for the cracking furnace. During normal production, they switched and modified the remaining nine cracking furnaces in turn according to the production situation, and finally completed the modification of the remaining cracking furnaces. The cracking furnaces operated well and the cracking furnace flue gas emissions were qualified.
In 2019, 4 cracking furnaces of Lanzhou Petrochemical's ethylene cracking unit were retrofitted with low-nitrogen burners. In 2019, 4 cracking furnaces of Lanzhou Petrochemical's ethylene cracking unit were retrofitted with low-nitrogen burners.: (1) A total of 64 sets of existing bottom burners in 2 SW cracking furnaces (EH-101G, EH-101H) were replaced with low-nitrogen burners one by one. (2) A total of 32 sets of existing bottom burners and 128 sets of existing side wall burners of 2 Wison cracking furnaces (EH-101J, EH-101K) were replaced with low-nitrogen burners one by one. The layout, quantity and heating load of a single burner of low-nitrogen burners after modification and replacement remain unchanged from the layout, quantity and heating load of a single burner of the existing burners of the cracking furnace. The heat supply load of the low-nitrogen burner after replacement will not change the existing heat load requirements of the cracking furnace, meet the existing heat flux curve of the cracking furnace, and maintain the existing COT temperature and thermal efficiency of the cracking furnace unchanged. The low-nitrogen burner uses advanced fuel classification technology and flue gas recirculation technology to effectively reduce the emission concentration of various pollutants in the combustion flue gas while meeting the process heat requirements. * * and below the emission limits stipulated in local standards. This type of burner has been successfully used in industry. The effect of reducing NOx is very obvious, and its denitrification rate can reach more than 60%.