Science and Technology Forum Fusheng Air Compressor Cooling Water Protection Device Renovation Fang Zhenjiang (Longshan Hegang Branch Nanshan Coal Mine, Hegang 154104, Heilongjiang Province) Safe, convenient and intuitive fine air compressor cooling effect, to achieve safe operation of air compressor method. The air compressor is an important production and safety equipment for coal mine production, and it is the four major parts of coal mine mechanical and electrical equipment. It mainly provides power for pneumatic tools and devices in the upper and lower systems of coal mines. It is the safest energy in mines with gas and coal dust explosion hazards, especially now it is an important equipment for self-rescue systems in the six major coal mine systems. . Whether it can operate safely and reliably is directly related to the safe production of coal mines. The Nanshan Mine Vertical Air Compressor Station has 11 SA series screw air compressors produced by Beijing Fusheng Machinery Co., Ltd. to provide power wind source for mine pneumatic tools. The total air supply capacity is 480m3/min, and the actual wind is 80~160m3. /min, all air compressors are cooled with cooling circulating water. According to the provisions of Article 437 of the “Safety Regulations for Coal Minesâ€: water-cooled air compressors must be equipped with water shutoff protection devices or water shutoff signal display devices. However, the Fusheng air machine has no water shut-off protection device at the factory. The high temperature can only be replaced by over-temperature protection. However, this over-temperature protection can only detect the over-temperature after the detection point, that is, after the fault occurs and the danger is reached. After the degree of protection can be taken, it can not achieve the early warning when the cooling effect of the air compressor is interrupted or insufficient due to the interruption or insufficient cooling water, and the internal temperature will not be reached. The temperature is uneven, the degree of thermal expansion in the machine is different, and the deformation has an effect on the life of various sealing materials of the machine. At the same time, since the setting value of the over-temperature protection of the screw-type pressure fan is 107 ° C, the cooling water has vaporized, and if the cause occurs again The scale generated by the disrepair and clogging of the cooling waterway, the high-temperature water vapor can not be opened, and the cylinder explosion accident occurs, which seriously affects the safe production of coal mines. The water cut protection device can immediately promptly warn or stop when the cooling water is interrupted or insufficient during the start of the air compressor or during the operation, and there will be no high temperature and over temperature phenomenon, and the air pressure will be affected. The safe operation of the machine. Therefore, in order to ensure the safe and reliable operation of the air compressor, it is necessary to install water cut protection to meet the requirements of the Coal Mine Safety Regulations. We originally installed a target flow switch on the return pipe of Fusheng Air Compressor to solve the problem of air compressor water cut protection, but it often appears in the actual use process: the target part is blocked; the target mechanism is corroded; The phenomenon of movement and malfunction often occurs, which seriously affects the normal operation of the air compressor. In order to improve the reliability of water cut protection, we found the FD50 (FT51) digital display flow and temperature monitor (hereinafter referred to as FD50 (FT51) monitoring 网上 on the Internet. After analysis, this monitor is very suitable for the water cut protection of air compressors. (FT51) The monitor replaces the original target flow switch, which can display the actual water supply or actual water temperature, and converts to the on-off signal according to the actual need of the lowest water consumption and the maximum allowable water temperature, and then transmits it to the electronic control system. In the PLC. Monitoring, (FT51) monitor has initialization time, so the PLC. program is re-modified, the actual water supply of the air compressor is less than the required water consumption or the water temperature exceeds the maximum allowable temperature, then the signal is sent and transmitted to the PLC. Control the air compressor to stop, protect the pressure fan, and achieve the function of water cut protection and cooling water temperature protection. At the same time, the amount of cooling water of the air compressor can be observed from the number display portion, and the smoothness of the air compressor cooling system can be judged according to the total water supply pressure value, and whether the cooler needs to be cleaned. The digital display flow and temperature monitor we use is made by Shanghai Zhili Electronic Equipment Co., Ltd., which has a full stainless steel structure. The appearance is as follows: Model: FD50-G12EDR digital display flow monitor, only monitor flow, relay output. The FT51-G12EDR digital display flow + temperature monitor monitors both flow and temperature and has separate relay outputs. The above two can be purchased according to their own requirements. We choose: FT51-G12E-(FT51) monitor is installed on the cooling water outlet side of the air compressor. The control head part should completely enter the inner wall of the pipe, and it can not touch the pipe wall. And ensure that the probe part can fully contact the measuring medium, and there is no obstruction of the control head in the flow direction. Q Set the upper and lower limits of the amount of cooling water according to the requirements of the air compressor. For example, the air compressor model of our mine is SA250W, the normal water demand is 10T/h, the water supply pipe diameter is 50mm, and the normal flow zone is about 1.4m/s, so the upper limit is set to 1.4m/s and the lower limit is set to lm/ s, that is, when the flow rate of the cooling water is 1.4m/s, the air compressor can be started, and when the flow rate is lower than lm/s, the air compressor is stopped. (FT51) The output node of the monitor is connected to X5 (alternate point, and the program section is added in the pressure fan program to make the flow rate higher than 1.4m/s (corresponding to about 10T/H). /s (about 7T / li time air compressor delay stop (note that the equipment must be stopped normally to reduce damage to the air compressor). When the temperature is set higher than 5 °C, the air compressor can start, higher than 40 ° C time air compressor is stopped. If there is a condition, the alarm interface can be added on the touch screen. (FT51) Please refer to the instruction manual for the adjustment method of the monitor. (FT51) The monitor is very suitable. It not only has long service life, reliable operation, but also can visually observe the actual cooling water volume of the air compressor. This is very suitable for the air supply system of multiple air compressors sharing the cooling system. It is very convenient and intuitive to adjust the amount of cooling water of each air compressor reasonably. In my opinion, the air compressor protection device modified with the FD50 (FT51) monitor cannot be described by simple water cut protection, and the water shortage protection should be changed. It can ensure that the air compressor cooling system works within the design requirements, thus ensuring that the air compressor works in an optimal state and ensures the safe and reliable operation of the air compressor. Its application has improved the coefficient of safe operation of the pressure fan and ensured the demand for the construction of a green and safe mine in Nanshan Coal Mine. >, 48 years old, male, Han nationality, graduated from Hegang Mining Bureau Staff College, professional application electronics, now studying in Heilongjiang Institute of Science and Technology electrical engineering (correspondence > August 1985 to participate in work, unit Long coal Hegang branch Nanshan Coal Mine Power Division, assistant engineer.
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