Formulate construction guidelines for non-ferrous metal intelligent mines and factories, and guide the construction of industry intelligent standardization. Reducing production energy efficiency and overall controllable cost, promoting the rapid iteration of production equipment and improving enterprise profits are the problems that need to be solved urgently in current industry. Recently, DEAR air separation cooperated with customers and signed a 2400/1000-type small and medium-sized air separation plant project, which was highly recognized by customers through reasonable scheme design.
The 2400/1000-type solution of small and medium-sized air separation plant adopts the whole low pressure process of molecular sieve adsorption and turbine expansion machine refrigeration. This device includes: air filtration system, air compression system, air precooling system, molecular sieve purification system, whole rectification hydrogen-free argon production system, turbine expansion unit, oxygen pressure system, nitrogen pressure system, liquid storage system, instrument control system, electronic control system.
After removing the dust and other mechanical impurities in the air filter, the raw material air enters the air turbine compressor and compresses the air to the required pressure, then enter into the air cooling tower to exchange heat with water and then enter into two molecular sieve adsorbers which are used alternately, in which impurities such as water, CO2, C2H2 and so on in the air of raw materials are adsorbed by the molecular sieve.
Extract part of the gas from the middle of the main heat exchanger and enter the expansion machine. The air after expansion enters the upper tower. After the air enters the main heat exchanger, it is cooled to the saturation temperature by the reflux gas and enters the lower tower with a small amount of liquid. After the initial rectification of the air in the lower tower, the oxygen-enriched liquid can be obtained from the lower tower. The liquid can go into the upper tower after being cooled by the cooler. After further rectification by the upper tower, the oxygen with a purity of 99.6% can be obtained from the bottom of the upper tower, the oxygen of this product is reheated by the main heat exchanger and then sent to users after being released from the cold box. Get 99.999% nitrogen from the top of the tower, and get it out of the cold box after reheating by the cooler and main heat exchanger. Sewage nitrogen is extracted from the top of the tower, and then it goes out of the cold box after being reheated by the cooler and the main heat exchanger. After heating, it enters into the regeneration heater and acts as the regeneration gas of the molecular sieve, and the surplus gas is emptied.
The argon distillation extracted from the top and bottom of the tower enters the bottom of the crude argon Tower 1, and the rising steam is extracted from the top of the crude argon Tower 1 into the bottom of the crude argon Tower 2. After the rectification of the two towers, the crude argon is obtained from the top of the crude argon Tower 2, and most of the crude argon enters into the condenser of the crude argon tower, which is condensed into liquid by the liquid air and reflows to the crude argon Tower as the reflow liquid of the crude argon tower. The liquid returned to the crude argon Tower 2 is pressurized by the liquid argon pump and then sent to the top of the crude argon Tower 1. The liquid distillation after being rectified by the crude argon Tower 1 returns to the upper tower from the bottom, and part of the crude argon enters the refined argon tower. After being rectified by the refined argon tower, the required pure argon can be obtained at the bottom of the refined argon tower.
External pressure zone argon flow chart