Purification equipment

In order to reduce the installation cost of the equipment, more and more air separation users require the cold box to be assembled when delivered from factory. The cold box packaging is to reasonably divide the functional modules in the design, complete the equipment manufacturing in the factory, and complete the product delivery in the form of modularization. Compared with the equipment parts leaving factory and on-site installation, the overall cold box can make full use of the perfect hardware facilities and good construction environment in the manufacturing plant, greatly reduce the on-site workload, improve the product quality control, speed up the construction progress and reduce the manufacturing cost.

At the beginning of starting the full low pressure oxygen generator, all the air entering the equipment is inflated through the expander, while the total expansion volume of the expander (including the standby) set by the equipment is much smaller than that of the air compressor. In addition, at the beginning, the intake temperature of the expansion machine is much higher than the design value, and the actual air volume that can enter the expansion machine is less than the design expansion volume. Therefore, there must be a part of air to be emptied first, in order to avoid the air compressor overpressure or surge. When the liquid begins to accumulate, air is sent to the lower tower, then through the throttle throttle to the upper tower, and then combined with the expansion gas to the heat exchanger to recover the cooling. However, at the beginning, the air that can be eaten in the air separation tower is very small, because the liquid air, liquid nitrogen pipeline and regulating va...