Discussed and made some suggestions on the safety and economy of the design of the compressed air station system in the float glass factory. Compressed air; double mother tube; safety; economy With the increasing production capacity of flat glass in China, the competition in the glass industry is becoming more and more fierce. The competitive glass companies reduce investment, reduce energy consumption, reduce operating costs, and occupy the market. The share is expanding the float glass production line to achieve large-scale benefits of glass production. In addition to increasing the capacity of each production line, the size of the glass enterprise is mainly to increase the number of glass production lines. At present, many new glass factories at home and abroad have built two or more production lines in one plant area. The compressed air station provides a station for power meter gas and atomization gas for the glass factory. As a public works, in order to reduce investment, ease of operation and management, several glass production lines share a gas station. Although each glass production line has its own maintenance cycle, under normal circumstances, it is impossible for all glass production lines to be cold-finished at the same time. As long as the production line runs, the air compressor station must ensure continuous supply of compressed air. The previous air compressor station compressed air system and circulating water system are single mother pipe systems. This system is difficult to maintain due to the mother pipe in the continuous air supply state. If an accident occurs in one of the main pipes, the entire air compressor station will stop. Air supply cannot meet the requirements of continuous, non-stop, safe and reliable supply of compressed air. Through years of design practice, I have continuously researched, explored and innovated the design of compressed air stations in glass factories with multiple production lines; creatively adopted double mother tubes and double circuits for compressed air systems and circulating water systems. The two-way air supply and the return water supply design mode at both ends make the air compressor station have less investment and the operation is continuous and safe. Taking the design of a compressed air station of a float glass production line in Xinyi as an example, the safety and economy of the design of the compressed air station system are discussed. 1 Xinyi, a glass factory, compressed air station overview Xinyi, a glass factory plans to build four float glass production lines, the production line is designed according to the burning of natural gas, consider burning heavy oil spare. There is a compressed air station in the plant to provide heavy oil atomization and compressed air for power meter for four float lines. The total amount of compressed air required for the four float lines (after considering the leakage coefficient) is about 165m3 /min when burning, and about 265m3/min when burning oil. Therefore, there are 6 sets of GA355W type injection screw in the compressed air station. Press (the owner does not require the use of centrifugal compressor), the displacement of each air compressor: 55.8m3 / min, the exhaust pressure of 0.75MPa when cooking oil, five use one, when burning gas, three use three. Considering that the air compressor station must continuously supply air, in order to avoid equipment and pipeline damage and maintenance, the air supply to the factory's four float glass production lines is empty (air) The influence of the IK machine, after comparison of various schemes, determines that the compressed air system design adopts double mother pipe and double circuit gas supply, and the circulating water system adopts a design scheme of segmenting water supply and connecting. The main technical indicators of the compressed air station are shown in Table 1. Table 1 Xinyi The main technical indicators of a compressed air station of a factory Equipment name Model and specifications Equipment quantity adsorption dryer / (m3.min') fine filter / (m3miri dust filter / (m , min gas storage tank / m3 2 air compressor station circulating water system safety and economic analysis air compressors used in compressed air stations are water-cooled compressors, each air compressor according to the summer inlet and outlet water temperature difference At = 8C consideration It is required that the circulating water volume is 50th. The circulating water inlet water temperature is not more than 32. The return water is gravity flow, and the circulating water supply into the workshop pressure is: 0.25 ~ 0.35MPa. When the production line burns oil, the air compressor is used for five times. When the circulating water needs normal operation, about 250th when the air compressor is down, in this case, if a single mother tube circulation system is adopted, the diameter of the circulating water supply pipe is DN250, and the diameter of the circulating return pipe is DN400. The air compressor station must supply air continuously, and the air compressor must be cooled by circulating water. Therefore, the circulating water cannot be stopped and must be continuously supplied. In the single mother tube state, after long-term operation, if the circulating water main pipe (especially the water supply pipe) )hair Failure, pipeline maintenance will stop the air compressor station, resulting in the inability to supply gas, affecting the safety of compressed air supply. In view of the above reasons, we adopted the design concept of double mother tube in the design of circulating water system of air compressor station. The circulating water is fed back and forth at both ends of the return water, and the water is supplied back to the section and connected. The compressed water system of the compressed air station is shown in the figure. This system uses two ends for water supply. Each casing line only needs to consider 3 air compressors for water. Therefore, the circulation water pipe diameter is small, the diameter of the circulating water supply pipe is DN200, and the diameter of the circulating water return pipe is DN250. The pipeline investment is reduced, and the pipe diameter is reduced. The width and depth of the circulating water trench in the air compressor station can be reduced, and the civil construction cost is reduced. In addition, in the system, the water supply and return water are connected in the middle. During normal operation, the Unicom butterfly valve is fully open. When a problem occurs in one pipeline, the Unicom butterfly valve is closed in a short period of time to repair the problematic pipe section. At this time, there are still three sets of air compressors running, and the compressed air produced can still meet the gas requirements of the power meter in the plant area to ensure the safety of the gas in the glass factory. In order to make the circulating water system of the air compressor station more reliable, the return water supply from the circulating pump house in the plant to the air compressor station is also arranged in a double circuit. The specific arrangement is as shown. The pipelines of each system in this system are considered according to 70% of the total water consumption of the air compressor station. In this way, when there is a fault in the supply and return pipes of the plant, the circulating water of the air compressor station can be provided by another pipeline in a short period of time, thus ensuring The entire circulating water system is safe and reliable. Factory area circulating back water r area circulating water supply pipe IK shrinking 7 [station fr area recycling water supply bamboo r area circulating return pipe connection circulating pump house 3 air compressor station compressed air system safety and economic analysis of multiple production line factory The compressed air station must be continuously supplied with gas, so the previous single-master system has not adapted to the requirements. Once the single-tube system fails, the maintenance will cause the air compressor station to stop supplying air, which will affect the float line of the glass factory. Compressed air is safe to use. The design of the compressed air system of a factory in Xinyi adopts double mother tube arrangement and double loop air supply. The biggest advantage of the double-mother tube system is that it is flexible in operation and convenient for switching and maintenance. When a problem occurs in the system, the compressed air can be supplied by another system, thereby ensuring continuous and stable supply of compressed air to the air compressor station, and ensuring the safety of the gas in the glass production line. Sex. See the compressed air system flow diagram. The system is provided with two mother tubes. The compressed air produced by the six air compressors respectively removes part of the water and oil through the respective filters and then enters the 2m3 buffer tank. After exiting the 2m3 buffer tank, it is divided into two channels and enters 2 The diameter of the root pipe and the parent pipe is determined by the total amount of compressed air required for the air compressor station at a large economic flow rate. Normal compressed air for atomization of the float line is taken from the two mother tubes, and any one of the main tubes can provide ordinary compressed air to the production line. In addition to the atomization of the compressed air, the gas enters the micro-thermal regenerator for gas purification treatment, and the qualified purified compressed air is divided into two purified compressed air mother tubes from the outlet of the micro-thermal regenerator, each of which purifies the compressed air. The main pipe is connected to a 10m3 gas storage tank, and two 10 m3 gas storage tanks can provide instrument power for the production line. In normal operation, the two mother pipe circuits are all used. Each circuit system is used for the power of two float glass production lines. The compressed air system is convenient to adjust the gas consumption of each float production line, minimizing the gas consumption of each float line. The interaction between them ensures that all the pipes have compressed air running, which helps to protect the pipes and reduce the corrosion of the pipes. When a certain pipeline or valve accessory in the system fails, the compressed air can be switched to one-way operation, which can easily repair the faulty valve and pipeline. The compressed air system adopts this design. Due to the addition of some pipes and valve accessories, the diameter of the pipe is smaller than that of the single pipe. Therefore, the initial investment is only slightly increased, and the cost of the single-loop system is increased from the economic point of view, but The system is flexible in operation and convenient in maintenance, which can ensure that the air compressor station will never stop, thus ensuring the safety of the power consumption of the float production line. From the comprehensive comparison of the safety and economy of the air compressor station, the dual-circuit air supply compressed air system is more reasonable. 4 suggested analysis. For a common compressed air station of a float glass factory with multiple production lines, it is recommended that the compressed air system and the circulating water system be double-female, double-circuit, dual-supply, and both ends. Backwater design mode, although this mode is much safer than the commonly used compressed air system; however, I believe that if the same area is built with 4 or more production lines at the same time, it is recommended to build two compression systems as described in the article. Air station and connect its pneumatic system. The air supply to the air compressor station will have higher reliability. Of course, whether the air supply to a compressed air station is safe and reliable, except for the receipt period: 200-. The water supply system and the gas supply system are safe and reliable, the power of the air compressor station: Wang Dehe, senior engineer system and other factors are also It needs to be safe and reliable. This paper only deals with the safety and economy of the circulating water system and compressed air system of the air compressor station.
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