What are the energy-saving measures for the ethylbenzene dehydrogenation process?

Consumption of high-pressure steam: In styrene plants, high-pressure steam is primarily used for reboiling in the various columns of the ethylbenzene distillation process, to drive turbines, to heat feed materials, and partly is reduced to medium pressure for use. Reducing its consumption mainly involves achieving operational balance by ensuring there are no leaks of high-pressure steam at the site. The traps should be carefully inspected to prevent bypass flow; for the ethylbenzene distillation towers, the bottom temperature and liquid level must be well controlled, and the heating capacity of the reboilers should be regulated while ensuring product quality. Avoid unnecessary waste. Minimize steam venting as much as possible while ensuring tower pressure is maintained. Consumption of medium-pressure steam: In the styrene plant, medium-pressure steam is primarily used as dilution steam in dehydrogenation reactors, for reboiling in distillation columns, in vacuum equipment, and for heating pipelines during winter. Reducing its consumption mainly involves starting with balanced operations, controlling the heating amount of the reboiler while ensuring product quality. Avoid unnecessary waste. Before winter arrives, check the drainage function of all traps to ensure that each one operates properly; replace those that do not drain effectively in order to reduce steam consumption. Deal promptly with any leaks, spills, or other issues at the site. Consumption of boiler feedwater: Boiler feedwater is primarily used in the high- and medium-pressure steam generators of the styrene plant, and it also serves to supplement low-pressure boiler feedwater in case of abnormalities in the plant. Stabilize and optimize the operation of the condensate stripping tower to ensure that the water at the bottom of the tower meets quality standards over extended periods, thereby preventing the need to introduce external boiler feedwater due to substandard water levels there. Adjust the amount of waste discharged appropriately to reduce unnecessary waste caused by human error. The MP and LP cooling BFWs should also be adjusted appropriately within their upper temperature limits in order to reduce the amount of boiler feedwater added. Consumption of circulating water: Minimize the use of circulating water while ensuring normal production. Do not wash the floor with large amounts of circulating water. Close the valve promptly after use. Nitrogen consumption: Nitrogen is used to purge hydrocarbons before switching or shutting down the alkylation reactor in the styrene plant, as well as for the regeneration of the alkylation reactor, the protection of storage tanks (covering), and instrument purging. Reducing its consumption mainly involves using as little nitrogen as possible during the regeneration of the alkylation catalyst, as well as during the purging of the benzene and polyethylbenzene pipelines when starting up or shutting down the plant. First, operate stably to avoid stopping. Second, closely monitor the consumption of nitrogen during the regeneration period. To reduce nitrogen consumption in the tank area, it is possible to check the airtightness of the storage tanks in order to minimize losses caused by leaks. Fuel oil consumption: In the styrene plant, fuel oil is used as the main fuel for the heating furnaces HS-101, HS-201/219. To reduce its consumption, it is primarily necessary to make use of domestically produced hydrogen fuel as much as possible, and to optimize the use of atomized steam and fuel oil in the burners. Fuel gas consumption: In the styrene plant, fuel gas is used to supply heat to the heater HS-201 when the exhaust gas compressor is shut down. Reducing its consumption mainly involves maintaining stable operation of the equipment, minimizing the number of compressor shutdowns, and reducing the use of fuel gas from outside the system. Consumption of the three chemical agents: The amounts of distillation anti-polymerization agents, product anti-polymerization agents, corrosion inhibitors, phosphates, liquid ammonia, and other such agents must be strictly controlled within the ranges specified by the analytical criteria; any changes in these control requirements must be addressed by adjusting the amounts added accordingly ； During the chemical addition process, the personnel responsible for adding the chemicals should try their best to prevent any loss of those chemicals. Electric power consumption: For the pumps on site, where conditions permit, try to reduce the return flow rate in order to lower the shaft power of the pumps. In offices and operation rooms, energy-saving light tubes and energy-efficient ballasts should be used as much as possible, and lights that remain on continuously should be avoided. Avoid using electric stoves for tasks that require drying. In summer, set the air conditioner to above 26°C as much as possible.