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ChineseThrough the analysis of the causes of many accidents, in order to effectively eliminate the explosion of the vacuum pump exhaust pipe, a series of safety technical measures have been adopted.
1. Filter
In the process of sucking air by the vacuum pump, a small amount of materials and residual liquid will be sucked into the valve plate of the pump, and at the same time, some lubricating oil will stick to the valve plate of the pump. These substances are carbonized at high temperature for a long time to form carbon deposits. Under certain conditions, they can easily cause deflagration when they encounter a mixture of combustible gases, and they are released through the exhaust pipe to form a detonation. In order to eliminate this phenomenon, a filter device can be installed on the intake pipe before the pump to filter dust or residual liquid, and the filter facility should be cleaned regularly to ensure good device performance. At the same time, the entire pump body should be maintained and the valve discs should be cleaned in time. Practice has proved that this work is best carried out every 3 months.
In the process of sucking air by the vacuum pump, a small amount of materials and residual liquid will be sucked into the valve plate of the pump, and at the same time, some lubricating oil will stick to the valve plate of the pump. These substances are carbonized at high temperature for a long time to form carbon deposits. Under certain conditions, they can easily cause deflagration when they encounter a mixture of combustible gases, and they are released through the exhaust pipe to form a detonation. In order to eliminate this phenomenon, a filter device can be installed on the intake pipe before the pump to filter dust or residual liquid, and the filter facility should be cleaned regularly to ensure good device performance. At the same time, the entire pump body should be maintained and the valve discs should be cleaned in time. Practice has proved that this work is best carried out every 3 months.
2. Cooling
Due to the constant reciprocating movement of the piston of the vacuum pump in the cylinder, the temperature of the pump body is too high, which provides conditions for the carbonization of the material, and finally induces an accident. In order to avoid this situation, the operator is required to open the cooling system of the pump before starting the pump, and ensure that the water inlet and outlet pipes of the system are unobstructed. The main reasons for the accident caused by the high temperature of the pump body due to the failure of the cooling water are the lack of responsibility of the operators, violation of operating procedures, and negligence.
Due to the constant reciprocating movement of the piston of the vacuum pump in the cylinder, the temperature of the pump body is too high, which provides conditions for the carbonization of the material, and finally induces an accident. In order to avoid this situation, the operator is required to open the cooling system of the pump before starting the pump, and ensure that the water inlet and outlet pipes of the system are unobstructed. The main reasons for the accident caused by the high temperature of the pump body due to the failure of the cooling water are the lack of responsibility of the operators, violation of operating procedures, and negligence.
3. Washing and buffering
Adding water washing and buffer storage tanks in front of the vacuum pump can effectively eliminate the inhaled residual liquid and also have a certain cooling effect on the mixed air. However, in actual work, the following two phenomena often occur: First, when the amount of residual liquid in the tank is small, a small amount of material liquid will be sucked into the pump body, and the material will be carbonized at high temperatures; second, when the residual liquid When the volume is large, if it is not discharged in time, the vacuum pump is very likely to inhale the material liquid and flush the pump, causing a larger equipment accident. Therefore, in the production process, workers are required to have a strong sense of responsibility to discharge residual liquid in time to avoid accidents.
Adding water washing and buffer storage tanks in front of the vacuum pump can effectively eliminate the inhaled residual liquid and also have a certain cooling effect on the mixed air. However, in actual work, the following two phenomena often occur: First, when the amount of residual liquid in the tank is small, a small amount of material liquid will be sucked into the pump body, and the material will be carbonized at high temperatures; second, when the residual liquid When the volume is large, if it is not discharged in time, the vacuum pump is very likely to inhale the material liquid and flush the pump, causing a larger equipment accident. Therefore, in the production process, workers are required to have a strong sense of responsibility to discharge residual liquid in time to avoid accidents.
4. Prevention of blocked or unblocked exhaust pipe
Blocked or unblocked exhaust pipes may cause the mixed gas containing methanol vapor to not be discharged in time. If it accumulates to a certain extent, it will leak out forcefully, cause detonation, or even explode. There are many reasons for this phenomenon, which may be due to a design defect, which results in the relatively low position of the exhaust pipe, and there is water or oil in the pipe; it may also be due to some human or natural factors, such as the failure of the outlet valve. Insufficient opening or opening, the collapse of the rain cover causes poor exhaust, etc. Therefore, when designing the location of the vacuum pump, the location of the main exhaust pipe and the design of related accessories are also more important.
Blocked or unblocked exhaust pipes may cause the mixed gas containing methanol vapor to not be discharged in time. If it accumulates to a certain extent, it will leak out forcefully, cause detonation, or even explode. There are many reasons for this phenomenon, which may be due to a design defect, which results in the relatively low position of the exhaust pipe, and there is water or oil in the pipe; it may also be due to some human or natural factors, such as the failure of the outlet valve. Insufficient opening or opening, the collapse of the rain cover causes poor exhaust, etc. Therefore, when designing the location of the vacuum pump, the location of the main exhaust pipe and the design of related accessories are also more important.
5. Exhaust gas control
It is a very important safety technical measure to prevent the explosion of the vacuum pump and strengthen the exhaust gas control. The exhaust gas discharged by the vacuum pump is mainly a mixed gas containing a large amount of methanol vapor. According to Jiazui’s physical and chemical characteristics and working practices, first install one or several sets of condensing devices (usually ice brine at about -10°C) before the buffer storage tank to condense the mixed gas; secondly, install one or more sets of condensing devices in front of the buffer tank; A set of condensing device is also installed on the site to condense the final exhaust gas, thereby reducing the concentration of methanol vapor in the exhaust gas below the lower explosive limit, and at the same time protecting the environment. However, it is necessary to properly control the flow of condensed water during the condensation process. If the flow is too small, the condensation effect will easily be poor. If the flow is too large, it will easily block the pipeline due to excessive condensation and affect the vacuum effect.
It is a very important safety technical measure to prevent the explosion of the vacuum pump and strengthen the exhaust gas control. The exhaust gas discharged by the vacuum pump is mainly a mixed gas containing a large amount of methanol vapor. According to Jiazui’s physical and chemical characteristics and working practices, first install one or several sets of condensing devices (usually ice brine at about -10°C) before the buffer storage tank to condense the mixed gas; secondly, install one or more sets of condensing devices in front of the buffer tank; A set of condensing device is also installed on the site to condense the final exhaust gas, thereby reducing the concentration of methanol vapor in the exhaust gas below the lower explosive limit, and at the same time protecting the environment. However, it is necessary to properly control the flow of condensed water during the condensation process. If the flow is too small, the condensation effect will easily be poor. If the flow is too large, it will easily block the pipeline due to excessive condensation and affect the vacuum effect.
In summary, taking these safety technical measures can effectively avoid the explosion of the vacuum pump. Of course, in order to ensure the true safe operation of the vacuum pump, in addition to adopting these safety technical measures, we must also start from the aspects of people, materials, management, etc., and strive to improve the operator's operating skills and safety quality.
