Apparatus and method for replacing pure nitrogen gas with waste nitrogen gas in oxygen production unit

Abstract

The invention provides an apparatus and a method for replacing pure nitrogen gas with waste nitrogen gas in an oxygen production unit. According to the apparatus, both ends of a pure nitrogen gas communication pipe provided with a 1# pure nitrogen gas communication value and a 2# pure nitrogen gas communication valve are respectively connected to a 1# connection pipe and a 2# connection pipe, both ends of a waste nitrogen gas inlet pipe having a waste nitrogen gas inlet valve are connected to a waste nitrogen gas total outlet pipe and the 2# connection pipe, a pure nitrogen gas pipe between a 2# nitrogen compressor and a pure nitrogen gas outlet valve is connected to a waste nitrogen gas pipe having a waste nitrogen gas outlet valve in a by-pass manner. According to the present invention, the waste nitrogen gas outlet valve is opened, the pure nitrogen gas outlet value is closed, the waste nitrogen gas inlet valve on the waste nitrogen gas inlet pipe is opened, the pure nitrogen gas inlet valve is gradually closed, the 2# pure nitrogen gas inlet valve on the 2# connection pipe loses the power, the 2# pure nitrogen gas communication valve is opened, and the 1# pure nitrogen gas communication valve to be shut down is gradually closed; and with the apparatus and the method, the no shut down is achieved during the gas replacing process, the gas purity is not affected, the replacement of the pure nitrogen gas with the waste nitrogen gas in the oxygen production unit can be substantially improved, the liquid nitrogen consumption and the electric energy consumption can be reduced, and the service life of the motor of the nitrogen compressor can be effectively prolonged.

Description

technical field [0001] The invention belongs to the field of oxygen-generating systems and processes, and particularly relates to a device and a method for rapidly replacing pure nitrogen with dirty nitrogen without stopping the oxygen-generating unit. Background technique [0002] A steel branch operates 2 oxygen generators under the existing production scale of 15,000 tons / day of steel to balance oxygen. Since nitrogen is mostly used for safety and sealing, the consumption is 20000m more than the output 3 / h, in order to develop and utilize this 20000m 3 / h dirty nitrogen, so use the out of service nitrogen compressor to press pure nitrogen. However, every time the oxygen generator that pressurizes nitrogen gas needs to be shut down when the blast furnace is shut down, it is necessary to first replace the pure nitrogen running the oxygen generator with polluted nitrogen, and the pure nitrogen should be delivered by the nitrogen compressor of the shut-down unit. In order...

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Problems solved by technology

[0003] Every time the pure nitrogen of the oxygen generating unit is used to dump the nitrogen, the 2 nitrogen compressors will be shut down, and then all the inlet and outlet valves of the contaminated nitrogen and pure nitrogen will be reversed, and then the 2 nitrogen compressors will be restarted. The balance of running nitrogen and the frequent start of the nitrogen compressor not only waste electric energy, but also affect the service life of the motor

The blast furnace will shut down once a month, and every time it reverses, it will cause 20m 3 Liquid nitrogen gap, more power consumption of more than 1000kW

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