Energy-saving method for heating furnace system of alkylbenzene complex

Abstract

The invention discloses a heating furnace system energy saving method for an alkylbenzene integrated unit. One tenth to one eighth hot oil is controlled to be heated to 315-330 DEG C at a convection section of a dehydrogenation heating furnace, seven eighths to nine tenths hot oil is heated to 315-330 DEG C through a hot oil heating furnace, and the two parts of hot oil is mixed and then conveyed to all heat consumption points; the temperature of the mixture of smoke generated by the dehydrogenation heating furnace and the smoke generated by the hot oil heating furnace is 300-320 DEG C, heat exchange is carried out on the smoke and air, and the air is heated to 240-255 DEG C and conveyed to the dehydrogenation heating furnace and the hot oil heating furnace to be mixed with fuel to carry out combustion heat supply. According to the heating furnace system energy saving method for the alkylbenzene integrated unit, the temperature of the air is lower than 270 DEG C after heat exchange is carried out on the air and the smoke, the synthesis of nitric oxide is effectively controlled, meanwhile, the waste heat of the smoke is effectively recycled, and the purpose of saving energy is achieved. The furnace efficiency of the heating furnaces can reach 93%, and the purposes of saving energy and protecting the environment are achieved.

Description

technical field [0001] The invention belongs to the application field of process technology, and relates to an energy-saving method for a heating furnace system of an alkylbenzene complex, in particular to the industrial application of the energy-saving process technology for a dehydrogenation heating furnace and a thermal oil heating furnace system of an alkylbenzene complex. Background technique [0002] The heating furnace used in the normal operation of the heating furnace system of the alkylbenzene complex includes: thermal oil heating furnace and dehydrogenation heating furnace. The fuel energy consumption of the alkylbenzene combined plant accounts for more than 70% of the comprehensive energy consumption, and the energy-saving design of the plant focuses on the fuel saving of the heating furnace system. The alkylbenzene combined unit was the first to introduce UOP technology from the United States. The feed temperature of the alkane dehydrogenation heating furnace is...

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Problems solved by technology

[0003] 1. The normal production of the alkylbenzene complex does not require steam, and the shut-down purge steam and fire extinguishing steam can be purchased outside, and the purchase price is lower than the self-production price, and the waste heat boiler technology is uneconomical;

[0004] 2. After the flue gas from the dehydrogenation heating furnace and the flue gas from the thermal oil heating furnace are mixed, the temperature is higher than 390°C. The flue gas at such a high temperature heats the air. When the air temperature exceeds 270°C, as the air temperature rises, a The amount of nitrogen oxides increases rapidly, which is harmful to the environment;

This technology occupies a large area, the heat exchange process is complicated, and the investment is high

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