Large air separation FAQ

The influence of argon production in air separation equipment on the liquid air inlet

Core tips: answer: 1. the manufacture, inspection and acceptance of the lower distillation column comply with the provisions of JB/T2549-1994 "aluminum air separation equipment manufacturing technical specification" and JB/T4734-2002 "Aluminum Welding container.

1. Valves in cold box shall be installed after all vessels are in place and before pipeline installation. 2. The cold valve in the cold box shall be installed together with its corresponding support. The valve stem of cryogenic liquid valve should be inclined upward by 10°to 15°. When the pipe is welded with the valve body, the valve should be closed first. Take cooling measures to make the temperature of the valve body not higher than 200℃ during welding, so as to avoid the deformation of the valve seal and affect the normal use of the valve. 3. When installing the valve, pay attention to the arrow direction on the valve body, which should be consistent with the medium flow direction. On special occasions, some cold Angle Globe Valves and straight through heating valves outside the cold box make their directions opposite (according to the marks on the process flow chart). 4. The valve shall be opened and closed flexibly after installation. The valve opening and closing state

What impact does the air separation tower of the air separation equipment have on the operation of the main tower when producing argon

Such failures include "cooling leakage" and freezing of valve packing, leakage of valve seat and pipe connecting flange, and leakage of valve screw sleeve at both ends of tinned thread. The stem packing is usually located in the packing groove of the stem close to the cold box wall. When the packing is not uniform or tight, and the valve stem is not straight or round, cryogenic liquid or gas will leak along the packing gap. As a result of cold transfer to the outside, the water in the air will freeze on the packing, thus freezing the valve stem. In this case, the valve can only be opened and closed by heating the filling with steam or hot water. However, after opening and closing the valve, the water accumulated in the packing will freeze again. The valve stem is usually twisted and the handwheel is broken due to the hard work of valve opening and closing. Therefore, after the maintenance of the valve, the packing should be evenly and tightly packed, and the compression nut should b

In the internal compression process air separation plant, we generally select the the multistage centrifugal pump as the liquid nitrogen pump. In order to ensure the stable operation of the liquid nitrogen pump, the pump seal mostly adopts the structure of gas-filled labyrinth seal.

The load adjustment range of low pressure air separation plant is related to the adjustment performance of raw material air compressor, the adjustment performance of expansion machine, the structural characteristics of distillation column and other factors. At present, the flow regulation range of the turbine air compressor equipped with imported guide blades is 75% ~ 100%; the adjustment range of turbine expansion machine with adjustable nozzle can be 65% ~ 100%. The key is how much room for adjustment of the distillation column is. At present, the load regulation range of the distillation column with regular stuffing can reach 50% ~ 100%, while the best adjustment range of traditional screen tower is 70% ~ 100%, no matter how low the load is, the leakage may be caused by the low speed of steam passing through the sieve hole. When oxygen is rich and needs to reduce the output of oxygen, the output of oxygen products should be reduced first, then the air flow should be reduced corre...

How to deal with liquid suspension in the air separation tower of a large air separation equipment

Selection of argon fraction extraction port on the upper tower of air separation equipment

The actual running current of 132kw-8 electric motor is 220A ~ 240A, four air compressors share one air storage tank, and the actual pressure required is 0.6 ~ 0.7Mpa, remote pressure gauge indication is 0.64Mpa. How to reform? 1. Only one (132kw-8) of the four air compressors is changed to be added with a pressure transmitter, and the actual pressure of the sampling pipe network is fed back to the inverter. Inverter automatically adjusts output voltage through software (PID function. (That is to reduce the actual power) to meet the actual gas consumption. After agreement, in order not to affect the motor temperature, we adopt RB600-3P160G type (160kw inverter ). II. Adopt manual switching of power/frequency conversion. If there is something wrong with the frequency converter, it can be changed to power frequency operation. It really does not affect the actual production of the factory and ensures the long-term operation of the air compressor. Third, according to the pressure requir...

The unit power consumption of oxygen production W02 (kW • h/m3) is one of the important economic indicators of oxygen production. In the power consumption of the oxygen generation of the air separation plant, the power consumption of the air compressor is the most important part. Its power consumption (kw • h/h) is related to the pressure ratio, and the calculation formula is E02 = yo2ρ r'tln (p2/p1)/(⊙yk 3600 ε T ε M), thus it can be seen that the unit power consumption of oxygen generation is roughly proportional to the logarithm of pressure ratio and the purity of oxygen; it is inversely proportional to the extraction rate of oxygen and the efficiency of compressor. Therefore, during the operation, the working pressure should be reduced as much as possible; the compressor should be fully cooled to improve the isotherm efficiency of the compressor; the oxygen extraction rate should be improved as much as possible; on the premise of ensuring the product quality, do not pursue produ...

At present, most of the cooling materials filled in the cooling box of the air separation plant are Pearl sand. Pearl sand is a particle with small apparent density, which is easy to fly. It will invade the facial features, stimulate the throat and eyes, and even suck in the lung through the respiratory tract. Therefore, wear a protective mask when working. The fluidity of Pearl sand is very good, and its density is smaller than that of water. People will be drowned and suffocated when they fall into the Pearl sand layer. Therefore, the manhole on the top of the cold box and the loading position should all be installed with 8 ~ 10mm steel bar welded square-shaped safety iron fence to prevent accidents. When the Pearl sand needs to be removed, the leaking parts are found in the cold box. If it is oxygen leakage, it will increase the oxygen concentration in the cold box, and if it is fire overhaul, explosion accident may occur; if it is nitrogen leakage, the nitrogen concentration in ...