Analysis of Causes for Insufficient Exhaust Volume of LW-405 Air Compressor

Analysis of the Causes of Insufficient Exhaust Volume of Jia 405 Air Compressor Shu Wen, Department of Hydrogen Peroxide, Baling Branch, China Petrochemical Corporation, Yueyang, Hunan 414003, China. And propose improvement measures.

Jia Jia 405 air compressor is the main equipment of hydrogen peroxide equipment, a total of 3, providing air for the main unit. Since it was put into production in 1994, its gas volume has basically reached the design requirement, which is about 2, 2002,400. With the extension of the running time, the displacement of the engine is also reduced. From 1 to only 831, with the ability of the main process to be modified, the output is improved, and the requirements for the gas volume are also improved. There are surpluses, now 3 sets are fully open, only to meet the production requirements, no backup machine, which causes a relatively large hidden danger to the production. 2 The original flash analysis affects the exhaust volume. There are two parts that are the design and use of the compressor itself. The situation; the other part is the effect of atmospheric temperature and humidity. The current three-volume standard state 2.1 The impact of the compressor itself For a multi-stage piston compressor, the displacement of the entire compressor depends on the amount of gas that the first-stage cylinder can draw, and the amount of leakage. There are many factors affecting the amount of exhaust gas, which are roughly intrusive, 2.1.1 tolerance system, the influence of KaE1D type a relative gap volume s nominal pressure ratio m expansion over the scale variable index to increase the displacement, from the equipment point of view Said, mainly to reduce the value. The value is mainly the volume between the end face of the piston and the cylinder head when the cylinder end and the piston are at the dead point, the ring shape surrounded by the cylinder end surface of the piston end face and the first piston ring, and the outer diameter of the cylinder, the valve and the cylinder volume. The volume formed between the channels, the remaining volume formed inside the valve, is determined in four aspects. For the fixed-type equipment, the blue is to detect the clearance of the cylinder. The larger the clearance, the more high-pressure gas accumulated in the clearance volume, which affects the suction of the low-pressure gas during the next expansion process, thereby reducing the suction. To adjust the inlet pipeline to renovate 12, then 1 pipeline air flow is 1 = 19.7. The air flow loss change into the pipeline l2 = 04, 3.4 to improve the circulating cooling water quality to the production water, although the heat exchanger heat exchanger tube caused by the circulating cooling water is solved. Wall oil mud asked, but added the company's production water 4 transformation effect after the transformation. Air compressor supply air supply and supply air pressure can fully reach the design value, ensuring the wind demand of the device, the air volume is increased by 30. The village material consumption is also reduced from the original 70,000 yuan to 12,000 yuan, only materials The annual consumption can be saved by 686,000 yuan, and the operating cycle of the air compressor is greatly extended, the frequent cold start is reduced, and the frequency of failure of the air compressor is reduced.

Male, assistant engineer, graduated from Qingdao Chemical, now engaged in equipment management.

the amount. Consider the improvement of the cooling water process, the independent cooling water system or the stop point of the whole cylinder and the piston of the technical machine of the College of Mechanical Engineering. It is not as small as possible. Consider the thermal expansion of the piston and the gap between the head and the head to prevent it from happening. The phenomenon of hitting the cylinder.

21.2, the influence of the pressure system, the upper cause is the fluctuation of the suction force of the suction valve and the pressure in the suction pipe.

Demolition of the inhalation revealed that the spring of the inhaled spring 1 exhaust valve was the same. Excessive suction valve spring force increases the intake resistance, the gas is not enough to overcome the spring force, the valve plate is delayed to open; when the pressure in the cylinder rises to a fixed value, and the suction spring force is too large, the gas is made The valve closes early, causing insufficient intake air. In addition, the lift of the suction valve should be higher than that of the exhaust valve of the same stage, and the suction lift is small. Can lose a lot of resistance. , too small. The suction test is small, and the air valve 庳 and the valve frying roughness are good for the sealing effect. The lift of the suction valve is actually measured as 2.2. The process of exhausting the pottery is also 2 2, and the lift of the suction pottery rises to the non-cavity valve. The theoretical requirements are not met. (3) The influence of the pressure fluctuation of the gas path The fluctuation of the pressure in the suction line is mainly caused by the pulsation of the air flow. In the operation, the air flow in the pipeline is caused by the intermittent nature of the suction and exhaust. The pressure and velocity have a synchronous change, the airflow pulsation causes resonance, and the resonance has gas column resonance and pipeline mechanical resonance. According to the actual situation, it is mainly due to the looseness of the drive belt, resulting in mechanical vibration. Causes pipe vibration. Causes pressure fluctuations. All three air compressors have this view. The stomach stomach has been viewed by people (1) (1) causing the vibration of the road for more than 10 seconds. 1 frequency vibration. This phenomenon is caused by the quality of the belt + clearance, the hall, the softening of the belt for a long time, so that the belt fluctuates up and down, the order is the search of the pulley, the inspection of the three empty planes on the same plane from the pulley Yes, +1; the main factors affecting the heart are the gas properties and the cylinder wall temperature pressure ratio speed valve arrangement. It can be seen from this that the variable factor can only be the pressure ratio and the cylinder wall temperature. The ideal pressure ratio of the compressor is 2.2, while the actual operating pressure is 22 compared to the first stage, and the level is 2 because the pressure ratio is inversely proportional. This machine does not lower the heart. The cylinder wall temperature is also inversely proportional to the cylinder wall temperature, which depends on the temperature of the cooling water and the heat transfer effect of the cylinder wall. The machine is in production. The cooling water is prepared in a joint form, that is, cooling water. As a result, the cooling effect is very unsatisfactory, the cooling water outlet temperature deviates, and then changed to parallel mode, that is, the 1-stage cylinder and the intercooler are separately supplied from the water, and the cooling water is supplied by the cooling water tower. The temperature of the circulating water in summer is 3133 or so, make. The drop causes an impact on the volume of gas. In addition, the cylinder cover is arranged to find that the water jacket is more fouled and affects the heat transfer coefficient of the cylinder wall.

2.1.4 The effect of the leakage coefficient is usually the effect of the amount of leakage from the outside.

For the ring valve, when the first-stage intake valve is used for compression. The gas portion leaks from the intake valve into the intake pipe network; when the exhaust valve fails, when the piston is inhaled, part of the high-pressure gas compressed from the exhaust valve enters the cylinder first than the low-pressure gas on the intake valve side. , resulting in insufficient intake air. The gas valve is dismantled and the intake valve is damaged. The exhaust valve is more serious than the intake valve because the exhaust valve of the same stage is subjected to higher temperature and pressure than the intake valve. Improper maintenance and replacement is also a factor. Improper maintenance means that the valve spring is replaced, and the horizontal cylinder of the high and low pressure stage of the yellow-loading mixer is removed. It is found that the piston ring or the lead ring exists in the path position. The phenomenon of swelling due to thermal expansion, excessive speed wear occurs, the disc piston and the cylinder are worn, and the piston and the cylinder face have a groove after friction at the bottom, and the cylinder gradually becomes elliptical.

After reinstalling the piston ring and the guide ring, it was found that the live cold ring and the guide ring had a gap of nearly 121, and light transmission occurred. The compressed gas in the cylinder causes a level 1 overpressure, and if the first stage exhaust valve leaks, it will affect the intake air volume of the stage cylinder. The stage cylinder is vertical, and it is found that the mirror surface of the cylinder is rusted, indicating that the piston ring of the stage may also rise and fall because the piston ring may not be in contact with the mirror surface of the cylinder, and there is no sealing effect.

3 gas ineffective failure. The air seal of the 405 air compressor is a piston ring lock ring and a two-valve seal ring, and each ring has a straight cut, a total of 4 sets. Compared with the six-segment lock ring seal, it has only three slits. The seal ring and the lock ring lock ring have three cuts, and the total gap is 4.5. This makes the seal ring wear and then automatically compensates for the spring force. It is too small, this is also the main reason for the compressor gas seal operation cycle is short, easy to leak earlier than several cylinders, and the intercooler turns the cylinder cold leak.

22 air pressure and humidity on the displacement of the air pressure and air pressure on the air compressor nameplate on the gas, is the rated displacement, generally in the specific inlet state of the inlet pressure is 105 temperature is 20 conditions atmospheric pressure 76, take 0 The dry gas status is different. The air volume of the air compressor refers to the volume of air discharged at the point of emission per unit time, and is converted into the value in the intake state, instead of the price in the exhaust state. The air compressor takes in air from the atmosphere, and should consider the mountain. Factory Earth. The long surface is different at 5 degrees above sea level. Atmospheric pressure is also different, and air density is also different. In addition to seasonal changes in the year, the temperature of the atmosphere also changes, which also affects the density of the air. The Gening press, because the quality of the piston of the first-stage cylinder is different, and the final conversion to the standard is also different.

If you remember the amount of gas in the 10,000 card, the atmospheric pressure in the Yueyang area is about 1 between the temperature of the father 105 and about 2 between the 42 plants, so that the 405 air compressor can be considered without affecting other gas production. The factor is that the equipment itself is intact without any additional factors affecting the volume. The inlet pressure of the plant is quite high. The inlet pressure is 5 13. The temperature is 20, and the gas production and minimum gas production are converted into the standard state. The effect of humidity is different due to the humidity of the air. The water vapor component reduces the composition of air per unit volume. After compression, the partial pressure of water vapor increases with the increase of gas pressure. After the interstage cooling, the partial pressure of water vapor is greater than the temperature, and the actual average relative reduction of Guangyueyang is reduced by the separation of the phases. The humidity is 78, the humidity is large, and the air improves the change of the clearance of the compressor cylinder. This method mainly involves changing the gasket between the end cap and the cylinder of the cylinder. In the current film, the cotton pad is adjusted to the most suitable clearance, and the clearance is too large to reduce the displacement, but it should not be too small, which will cause the collision with the cylinder head, resulting in damage to the piston and cylinder head. The total clearance from the piston's dead center is adjusted from 7.58 to 6.5 to 1 cold. After the effect, the compressor in the vicinity is operated, and the cooling water jacket of the cylinder is fouled.

It should be chemically cleaned to improve heat transfer and reduce the temperature of the cooling water inlet. Because the cooling water is now circulating water, it is more energy-efficient, but the water temperature is higher. From the economic point of view, in summer, the domestic water with relatively low water temperature is used to improve the cooling effect of the compressor. The leather belt is driven to increase the speed by changing the proportional relationship of the main driven wheels of the leather wheel. However, when the speed is increased, the strength of the machine should be checked again, and the vibration should be considered. Also.

The increase in the half of the work also raises the requirements for the electrical stability of the motor = 4 to improve the quality of maintenance. First of all, we must close the spare parts, especially the quality of the wearing parts of the valve piston ring seal, strictly in accordance with the requirements of the design paper; in the inspection process, pay attention to the quality of inspection, strictly follow the inspection procedures, carefully check the valve Spring valve seat lift limiter usage. The slit clearance of the piston ring and the backlash with the piston groove, backlash, etc.; check the quality of the gas seal and pay attention to the installation method or technical modification of the gas seal, so that the service life of the gas seal is extended from the current 12 months to 6 Month, let it synchronize with the life of the piston ring.

4 Conclusion Maintaining the air compressor is the basis for ensuring stable production. In order to save energy and reduce consumption, eliminate the hidden dangers of accidents, and carry out technical transformation to improve the production capacity of the installation and create better benefits.

Pan Yongmi. Liszt. 1. Machine 1 is called. Beijing Chemical 71 stopped publishing house.

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