Small air separation FAQ

Small air separation equipment consists of air compressor, purifier, air separation Tower, expander, oxygen compressor and other main parts. Before starting, all parts of the equipment should be ensured to be in good condition and can be put into operation at any time. (1) The start-up preparation of piston air compressor after the installation of air compressor, it should be tested according to the instruction manual. The daily preparation work before driving should remember the words "water, oil, gas, electricity and safety", and check according to these five aspects. 1) Water: Open the cooling water, oil cooler cooling water and inlet valve of cylinder liner and cooler at all levels, and check whether the cooling water is unblocked and adjusted properly; 2) oil: it includes the lubricating oil of the cylinder and the lubricating oil of the running part. Shake the plunger oil pump by hand until the oil flows out of the check valve of each oil injection point is opened, and fill up...

Air cooling tower is also a hybrid heat exchanger. In order to make the cooling water fully contact and strongly mix with the air to enlarge the heat transfer area and strengthen the heat transfer, the "stuffing Tower" or "sieve plate Tower" are usually used, and hollow spray tower is also used. The stuffing Tower is a round container made of steel, which is filled with stuffing (porcelain ring, or plastic ring, etc ). The cooling water sprays down from the tower top and is mixed with the bottom-up flowing air for heat and mass exchange. Air transmits heat to cooling water to lower the temperature itself and raise the water temperature. In order to prevent the air from dripping out of the water, the upper part of the tower is usually equipped with laxige ring (or stainless steel wire mesh) stuffing separator (also called capture layer) and mechanical water separator (inertial separation ). The cooling water sprayed out by the spraying device flows downward along the stuffing layer t...

The newly installed distillation column must be thoroughly heated and blown off before starting and returning to work after long-term parking. After being put into operation, when the liquid suspension failure of the distillation column can not be eliminated, or the pressure difference before and after the heat exchanger pressure at the end of the operation period is more than 0.5MPa, or the purity of oxygen and nitrogen and the output decrease, it should be heated and blown off. First of all, make preparations before heating: 1) discharge the liquid in the tower; 2) dismantle the flow meter and thermometer at the outlet of oxygen, nitrogen and distillation, dismantle the upper and lower joints of the liquid air and liquid oxygen level gauge, and dismantle all the pressure gauges except the low pressure gauge; 3) close the high pressure air General inlet valve, joint-1 valve, oxygen and nitrogen products outlet valve, and the heating inlet main valve; 4) open the top rod of the inle...

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...

When the purity of the product decreases or the output decreases during the operation of the air separation plant, people will think of whether the heat exchanger will leak. Generally, the decrease of product purity is due to the leakage of high pressure air into the low pressure system; the decrease of production is due to the leakage of products into the cold box. However, the mutual leakage of air between the compartments affects both the output of oxygen and the purity of nitrogen. Now several judgements are introduced as follows: 1) high pressure air leaks into the oxygen Interlayer: analyze the oxygen purity of the condensing evaporator and the oxygen purity of the oxygen tube (which can be taken from the oxygen flow tube), and judge according to the purity difference between them. The purity of the two is the same, indicating that the heat exchanger does not leak; otherwise, it leaks. A small amount of air leakage will not affect the purity of the condensing evaporator, and ...

In order to ensure the normal operation of the compressor and extend its service life, besides regular maintenance and overhaul, daily maintenance and inspection are very important. In addition to using various instruments to detect the operation changes of the compressor, we usually use the methods of seeing, listening and touching to check. But these three methods are not isolated, but interrelated. One of them alone cannot check whether the compressor is running. Look -- with the method of look, we can see whether the parts of each transmission part are loose and whether the lubrication condition of each friction part is good; whether the cooling efficiency of cooling water and intermediate cooler of air cylinder at all levels is good and whether the flow of cooling water is smooth; whether the air cylinder and cooler at all levels are pouring; whether there is air leakage or oil leakage at all joints; Listen -- the method of listening can be used to correctly judge the operation...

The spacing between the tower plates determines the height of the whole distillation column. Therefore, it is hoped that the spacing between the tower plates should be as small as possible. Minimum plate spacing 1) liquid flooding should be avoided. That is to say, the plate spacing should be larger than the minimum spacing to ensure that the liquid flows smoothly from the previous plate to the next plate. It is calculated by the flow resistance of the reflux liquid through the overflow bucket. Obviously, it is closely related to the structural form of the overflow bucket and the height of the tower plate inlet baffle; 2) ensure that there is no fog clip. On the tower plate, the steam rises through the sieve hole and the liquid layer bubble, and the mass transfer area on the sieve plate basically consists of the following parts: close to the sieve plate is the static liquid layer, which is very thin; then is the bubble layer; which is the foam layer with honeycomb structure. Due to ...

Why does the time it takes for the oxygen concentrator of the air separation equipment to accumulate liquid during startup differ

What is the cooling capacity of an air separation equipment? How does the oxygen concentrator of an air separation plant cool down?

There are several types of cold insulation materials for air separation equipment and their characteristics

Water cooling tower is a hybrid heat exchanger. The purpose is to lower the temperature of cooling water in the cooling tower after cooling the air, so that the air cooling tower can be recycled. Different types strive to enhance heat transfer, improve cooling effect, and at the same time, flow resistance should be as small as possible, so that water is not easy to scale. The structure of water cooling tower selected by large air separation plant in our country roughly has the following types: 1) stuffing tower. In the early stage, it was a Laci ring with porcelain. Its heat transfer effect was good and the resistance was not big. However, when it is used in the process of self-clearing low pressure, because the switching system is switched once every few minutes, when the switching is emptied, the impact of airflow on the porcelain ring is relatively large, which is easy to cause the damage of the porcelain ring and increase the resistance. Some are also changed into plastic rings ...

Before closing the throttle valve, the conditions for closing the valve should be created: the liquid oxygen liquid level is close to the normal liquid level, and the liquid level has an upward trend. The temperature in front of section-1 valve should be kept at-155 ~ Between-165℃. The low pressure should be controlled at 0.05MPa, and the medium pressure should be less than 0.3MPa (surface pressure ). When you start to close the valve, you should master the speed of closing the valve. If it is closed too fast, it will cause liquid suspension; if it is closed too slowly, it will cause the liquid oxygen level gauge to be too full. The speed of closing valve is based on the principle of stable liquid oxygen level. If the liquid oxygen level rises fast, the valve can be closed faster; if the liquid oxygen level rises slowly, it will close slowly. If the liquid oxygen level has a downward trend, then the valve should be stopped. If the liquid level drops quickly and the medium pressure r...