The old oxygen compressor was originally a 3-stage compressed water-lubricated full-bottle oxygen compressor. Due to the 3-stage compression, the compression ratio is very large and the exhaust temperature is extremely high, so it must be lubricated and cooled by water. If the end gas water separator does not perform well, there will be more water in the oxygen. The filling of water-containing oxygen into the cylinder will cause corrosion of the cylinder and leave hidden dangers for safe production. Therefore, there are many accidents in which the oxygen cylinder explosion occurs. Industrial oxygen is also used in large quantities for metal welding and cutting. Oxygen with a large water content generates bubbles during welding, which affects the quality of welding. Therefore, everyone is exploring and trying to transform the original water-lubricated oxygen compressor into a water-free oxygen compressor.

In the early stage, there was a modification plan: reducing the rotation speed of the oxygen compressor and reducing the heat of compression in the oxygen compressor. Due to the low speed, the heat conduction time between the gas in the cylinder and the cooling water is prolonged, so that the gas can be cooled better. At the same time, the secondary cooler is moved outside the machine and cooled separately to reduce the inlet air temperature. , thereby reducing its exhaust temperature. However, the solution failed to reduce the compression ratio of the gas, and did not completely solve the operational safety problem. At the same time, due to the reduced speed of the oxygen compressor, the exhaust volume was only half of that of the original machine. Therefore, it was not accepted by the market and could not be promoted in the market.

At present, there is a transformation plan in the market, which is to transform the existing 3 columns and 3 old models into 3 columns and 5 stages of compression, which completely solves the problem of excessive exhaust temperature. The program utilizes the motion mechanism of the original oxygen compressor to improve its compression section. In order to increase the displacement of the oxygen compressor, the primary compression is designed to double-acting compression, and the displacement thereof is doubled, the production efficiency is improved, and the power consumption per unit pressure of oxygen is reduced.

The characteristics of the new oxygen compressor after the transformation: (1) The foundation of the oxygen compressor is unchanged. Whether it is a new oxygen compressor or an old oxygen compressor, the foundation can be changed without any change, which brings great convenience to the user.

(2) Due to the transformation into a low-speed compressor, the pulse of the airflow is relatively small, the impact on the pipeline is small, and the vibration of the pipeline is small; and the valves at all levels are changed into mesh valves to avoid positioning on the valve piece and the valve seat. The friction between the columns causes unfavorable factors, which greatly improves the safety of the oxygen compressor. Moreover, since it is a low-speed compressor, the linear speed of each moving part is relatively small, the wear of each component is reduced, and the service life of the spare parts is greatly extended.

(3) Because the new oxygen compressor adopts the movement mechanism of the old type machine, it has strong versatility with the old type machine, which is beneficial to the daily maintenance and management of the user.

(4) The energy consumption of the new oxygen compressor is relatively low. The power consumption of this type of machine produced by a certain manufacturer is about 0 24 kWh after detecting the compression of 1 m 3 of oxygen, and the power consumption for a long time is relatively low.

(5) Because the relevant joints of the new oxygen compressor adopt a good sealing design, the pressure of the compressor pipeline and each compression part is greater than the atmospheric pressure, thus ensuring that the purity of oxygen will not decrease.

2 Waterless pressurized booster oxygen compressor modified into medium pressure intake

At present, some oxygen filling systems have a medium-pressure oxygen source, such as a steel plant, which can be used as the intake of an oxygen compressor. However, due to the high intake pressure, it is necessary to adjust the cylinders of each stage. Due to the high intake pressure of the primary cylinder, in order to ensure that the piston force generated during its operation does not exceed the range that the motion mechanism can withstand, it is necessary to reduce the primary cylinder diameter. The second and third stage cylinder diameters are adjusted accordingly, which not only takes care of the reasonable distribution of the compression ratio, but also controls the piston force generated during compression to be within the range that the motion mechanism can withstand. Therefore, the choice of cylinder diameters at all levels is extremely important. According to the actual use of the user, the inlet pressure of the oxygen compressor is generally selected to be about 0 5 1 1 MPa, and the compression ratio is generally designed to be about 3, so that it can be compressed without water lubrication. The increase in intake pressure reduces the energy consumption of the oxygen compressor by 1/3, which greatly reduces the cost of oxygenation. Due to the large range of intake pressure, the operating parameters of the oxygen compressor are slightly different. When the lower intake pressure is selected, the compression ratio of each stage is relatively high, the exhaust temperature is also high, the total exhaust volume is small, the piston force is small during operation, and the shaft power is low. When a higher intake pressure is selected, although the compression is relatively small when the oxygen compressor is running, the piston force generated by the first-stage piston during operation is also high. Although the shaft power is also high, its displacement is also large, and the volume is large. It is lower than the energy. The technical parameters of the oxygen compressor inlet pressure change after the transformation.

It can be concluded that the first stage intake pressure is selected at 0 7 1 1MPa.

The retrofit solution is a good choice for a full-bottle oxygen plant with a medium-pressure oxygen source. Similarly, when the argon gas is filled with a liquid argon pump, the leaked argon gas pressure is 0 5 7 7 MPa. Due to the high cost of argon gas, the old oxygen compressor can be converted into an argon gas filling machine for recovery.

3 transformation into a carbon dioxide gas filling bottle compressor

The carbon dioxide filling equipment is divided into high pressure direct filling and low pressure liquefying filling. In the high pressure filling equipment, a high pressure carbon dioxide compressor with a discharge pressure of 10 MPa is required, and the carbon dioxide is directly charged into the steel cylinder, and the carbon dioxide is at normal temperature. Below (under 31 7), when the pressure reaches 8 MPa, the gas in the cylinder will liquefy. Since the high-pressure carbon dioxide is filled in a gaseous form, the gaseous impurities in the carbon dioxide cannot be separated. Therefore, the purity of the carbon dioxide is poor, and the water content is also high, but the investment is small and the manufacturing cost is low, which is in line with some small carbon dioxide filling. Factory needs. The old oxygen compressor was converted into a carbon dioxide compressor with a discharge pressure of 10 MPa, which was supplied to users who used high pressure to fill carbon dioxide.

4 transformation into a medium pressure waterless lubrication carbon dioxide (oxygen) compressor

With the continuous development of the economy, the demand for carbon dioxide in the market is increasing, and the quality requirements for carbon dioxide are getting higher and higher. Carbon dioxide low temperature liquefaction filling is a filling method for charging low temperature carbon dioxide liquid directly into the tank truck from the storage tank, and the non-condensable gas in the carbon dioxide floats above the storage tank. Since low-temperature carbon dioxide liquid is not only free of impurities, but also has a very low water content, low-temperature liquefaction of carbon dioxide has become the current mainstream. Because the tank tank for transporting carbon dioxide liquid is a medium pressure pressure vessel, the system pressure design in the carbon dioxide process must be lower than the tank tank pressure. If it is overpressure, it cannot be transported. Therefore, the carbon dioxide low temperature liquefaction filling equipment needs Medium pressure carbon dioxide gas compressor.

Medium pressure oxygen compressors are also required in the production processes of steel and fertilizer plants. Therefore, the old type of water-lubricated oxygen compressor is transformed into a medium-pressure oxygen compressor or a medium-pressure carbon dioxide compressor, which can meet the production requirements, especially the small-capacity carbon dioxide liquefaction equipment in the brewery, and is more suitable for such a compressor.

The secondary exhaust pressure of the original high-pressure compressor has reached 3MPa. If the high-pressure compressor is used directly to compress the medium-pressure gas, the compression ratio of the first and second stages is large, and the long-term use is unfavorable to the equipment, and the energy consumption is also large, which is not worth the loss. Way. A reasonable transformation method is to increase the diameter of the second and third cylinders to reduce the compression ratio of the first and second stages. On the one hand, the pressure distribution of the compressor is uniform, and on the other hand, the energy consumption of the compressor is greatly reduced.

5 transformation into a low pressure pipeline transport oxygen compressor

Some oxygen producers are close to some atmospheric oxygen users. For example, oxygen producers near some shipyards and crystal manufacturing plants generally use the filling method to deliver oxygen. Due to the high exhaust pressure of the oxygen compressor during filling, the energy consumption of the oxygen is high; at the same time, it is extremely unsafe and prone to accidents; and the transportation cost of the cylinder is large and the operation is cumbersome. The old oxygen compressor is transformed into a low-pressure oxygen pump with a discharge pressure below 0 8 MPa. The oxygen is sent directly to the workpiece table by the pipeline, which is convenient for the user and saves a lot of freight, and the oxygen compressor The power consumption can be reduced by nearly 1 / 2.

The transformation plan is to change the oxygen compressor to the second-stage compression and remove the middle column of the old one. Since the three rows of cranks of the old model are distributed by 120, the removal of the middle column has little effect on the balance of the operation of the oxygen compressor. As early as the 1970s, the Hangzhou Iron and Steel Plant had used a medium-pressure oxygen press that changed three columns to two columns to deliver oxygen to the converter. The effect was good. Remove the cylinders, pistons, crossheads and connecting rods of the third stage, adjust the diameter of the first and second cylinders and some of the pipelines accordingly, so that they have a more reasonable compression ratio and layout, which is the actual operation of the oxygen compressor. It has also been confirmed.

6 transformation into a low pressure oxygen compressor

The old model was transformed into a low pressure oxygen compressor of 0 3 4 MPa to meet the needs of users. The old type machine was changed to the first-stage compression oxygen compressor. Due to the limitation of the position of the upper water tank, the installation of the cooler was difficult, and it was impossible to change the three columns to the first-stage cylinder. Therefore, the diameter of the original secondary cylinder was enlarged to 285 mm. The first-stage cylinders work in parallel to remove the middle column of the old-type machine, so that the two primary coolers are installed in the water tank of the intermediate seat, and the shape of the original oxygen compressor is not changed, and the displacement is doubled. In order to ensure that the two primary cylinders are not disturbed from each other during operation, some effective measures have been taken in the exhaust duct.

Because the cooling water tank of the old model is small, in the design of the two primary coolers, it is still managed to install it in the water tank to maintain its original shape, which is convenient for users to install and use.

7 Conclusion

All the above modified models have been running normally in the user. If the peers have new ideas and ideas, I hope to give guidance.

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