Large air separation FAQ

Why is acetylene the most dangerous substance in air separation equipment

Why is it required to frequently discharge liquid oxygen equivalent to 1% oxygen production to the outside of the tower for evaporation in all low-pressure air separation equipment

At present, our government attaches great importance to the work of energy saving and emission reduction, and many binding targets such as China's energy saving and emission reduction during the "13th Five-Year Plan" period will be stricter. For large air separation plant, how to save energy consumption and reduce operation cost on the premise of ensuring safe, stable and reliable operation is an important issue in the design process of air separation plant. In recent years, due to the rapid development of metallurgy, fertilizer and petrochemical industry, the level of air separation equipment has been constantly expanding. For example, there have been more than 20 sets of large-scale air separation equipment of 60,000 grade which has been put into use made by Hangzhou Hangyang Co., Ltd, and it has expanded to 80 thousand, 100 thousand and 120 thousand levels. Molecular sieve purification system is the key device to purify the air before the air in the air separation plant enters in...

The main components in the air are nitrogen and oxygen. By selecting the adsorbents with different adsorption selectivity for nitrogen and oxygen, the appropriate technological process is designed to separate nitrogen and oxygen to produce oxygen. Both nitrogen and oxygen have four-pole moment, but the four-pole moment (0.31) of nitrogen is much larger than that of oxygen (0.10, therefore, the adsorption capacity of nitrogen on the zeolized molecular sieve is stronger than that of oxygen (nitrogen has strong interaction with ions on the surface of the molecular sieve, as shown in Figure 1 ). Therefore, when the air passes through the adsorption bed equipped with zeolized molecular sieve adsorbents under pressure, nitrogen is adsorbed by the molecular sieve, and oxygen is enriched in the gas phase and flows out of the adsorption bed due to less adsorption, separate oxygen and nitrogen to obtain oxygen. When the molecular sieve adsorbs nitrogen until it is nearly saturated, stop air v...

How are rare gases distributed in the air separation tower of the air separation equipment

1.The cold box foundation is composed of foundation body, water baffle, cold insulation layer and surface layer. 2.The surface of fractionator foundation after completion shall meet the following requirements: a) There should be no cracks and other defects on the surface; b) The surface should be clean, and no inflammable materials such as wood board and linoleum are allowed to be carried; c) Surface flatness < 5 / 1000; d) The surface levelness is less than 5 / 1000, and the total length should not be more than 15mm. 3.After the foundation is qualified, mark the installation center line of the container according to the installation position of the vessel, and mark the direction and position of the pipe orifice.

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.