Foreword According to the US Department of Energy's 2002 global survey results, the global air compressor flat compressed air system is widely used in the industrial field, its average load rate is 79%, while the average load rate of China's air compressor is 66%, which is expensive. Most plants account for about 10% and 40% of their total energy consumption. The root is 13% lower than the global air compressor load rate average. Practice certificate! A company's compressed air system equipment configuration table - Phase II manufacturer Ingersoll Rand Atlas type screw type control mode constant pressure on / download quantity rated flow m3 / min rated power (kW maximum working pressure (<=>) Air post-treatment mode without heat regeneration Drying freeze-drying control mode Single independent control semi-centralized control cooperates with experts of the United Nations Industrial Development Organization to carry out energy-saving assessment and enterprise case development of compressed air system.

After a comprehensive analysis of the compressed air system, the energy saving amount of the professional measures can reach 10% and 50% of the total energy consumption. For most users, it is very important to create a solution to better manage the compressed air system. Difficult because the compressed air system is much more complicated than the pump and fan system, and there is very little written material available to manage the entire compressed air system. The following article will take the project that has been implemented in a chemical fiber plant as an example to illustrate the system energy-saving technology of compressed air.

1Compressed air system overview The enterprise compressed air system consists of two air compressor stations, Phase I and Phase II. There are 22 air compressors with equipment configuration as shown in Table 1. 1.0MPa3 gas supply pressure levels. Among them, the pressure control mode of the first stage air compressor station is manually controlled, and the pressure fluctuation is large, as shown. When the gas load in the workshop changes greatly, the operator switches the machine frequently, causing pressure fluctuations and large equipment loss. In the middle of the night shift, the operator often adjusts the pressure to the load pressure curve as shown in the figure. This consumes a lot of energy. The output pressure of the compressor exceeds the rated value, which is 0.92MP+ (rated value is 0.86MP+), which makes the equipment overload. Such an operating mode is both energy intensive and detrimental to the device.

The pressure control mode of the second stage air compressor station is semi-automatically controlled, and the pressure is relatively stable, as shown. When the gas load in the workshop changes, the ES100 group control system can perform self-control adjustment well. When the load changes greatly, the operator must switch the operation of the air compressor and the operation of the grid-connecting device to adjust the pressure.

In the second phase of the company's second phase air compressor station expansion project, the second phase of the compressed air system is very tight, and the first phase has a surplus. The company designed and installed the first and second phase of the air-to-air pipeline connection device between the 8bar systems. The gas is coming to support the second phase. It played the role of mutual preparation of air compressors in the first and second phases, and installed a flow meter for metering and settlement. Later, the company implemented the second phase of the expansion project, and the increase in air pressure equipment made the second phase of compressed air slightly marginal.

2 Energy-saving renovation measures 2.1 The second-stage group control method will be extended to the first-stage system. The original installation of the first and second-stage compressed air system will be reversed, and the original control valve and flowmeter will be installed in reverse. The compressed air system to support the first phase. Since the second phase of the 0.8MP compressed air system is controlled by the group control device, the pressure is very stable. This self-controlled compressed air system is used to control the first-stage artificially controlled compressed air system, which expands the control range of the second-stage group control device. To stabilize the pressure of the first stage of the compressed air system.

2.2 Constant pressure regulation semi-automatic adjustment valve between different pressure levels, artificially semi-automatic adjustment according to system pressure to achieve stable system supply pressure. At the same time of voltage regulation, due to the adjustable pressure difference before and after the mediation valve, the gas storage capacity of the system is greatly improved by the gas storage tank of the system.

3 Energy-saving effect Through the implementation of the project, the first-stage air compressor station immediately stopped a 20m3/min air compressor. The implementation of the first-stage and second-stage compressed air grid-connected ES100 group control device extended the control of the first-stage pressure and improved the pressure fluctuation of the first-stage compressed air system. The main pipe pressure is maintained in the range of 0.72~0.74MPa. The working pressure of the first stage air compressor is reduced from 0.92MP to 0.86MP. The current hardware facilities are used to change the operation mode, and no investment is added to make the compressed air consumption level of a workshop. From the average unit consumption of 0.245 kWh/m3 in 2001 and 2002 to the annual average unit consumption of 0.191 kWh/m3 in 2003, saving electricity is the implementation of the scheme, so that the system pressure of the first phase air compressor station (a workshop site pressure) Pressure) is stably controlled. The live recorder is shown as a straight line, such as "like." The output pressure of the air compressor station is as shown in the 4 promotion prospects. At present, many enterprises have begun to realize that the compressed air system has certain energy-saving optimization space, and has begun to do some work, mainly based on frequency conversion. In fact, compared with the energy saving of water pump and fan system, the compressed air system is much more complicated, and there are many energy-saving methods. The frequency conversion is high because of its high investment, and the energy saving is not proportional to the third-order speed. It is not recommended by experts. Preferred energy-saving technology. In order to truly achieve system energy conservation, it is necessary to start from the whole system. In fact, sometimes a simple modification of the system or a slight change in the operation mode of the system can achieve very good energy saving effects.

When the company decides to carry out system transformation or plans to increase the air compressor due to increased production or due to insufficient system pressure, it is recommended to ask the professional company to conduct a comprehensive test evaluation of the system, because a large number of foreign practices prove that the local supply pressure is not sufficient. Insufficient installed capacity, through system optimization, not only does not increase equipment, but may turn off an existing air compressor. The items listed in this article is a very good success.

The Shanghai Energy Conservation Service Center is working with the United Nations Industrial Development Organization to implement the China Motor System Energy Conservation Project “with professional compressed air testing and diagnostic capabilities. This project is a demonstration project generated after the training of China's motor system energy-saving project compressed air system energy-saving technology”. .

Glass Fiber Membrane

Glass fiber membranes adopt 100% borosilicate glass fiber, including two types, with binder shows chemical inertness and without binder. Add the adhesive is to enhance the mechanical strength of the glass fiber, mainly used for filtering coarse particles such as macromolecular substance and air dust. In order to avoid reacting chemically with the filtered medium, use the glass fiber without binder to filter organic substances and use the glass fiber with binder to filter inorganic substances. The depth membrane with fast speed, large load and retain particles is very small, can get the scope of the submicron particles, etc. The glass fiber membrane can stand  500 ℃ , can be used to analyze the  burn proportion and high temperature gas filtration.

 Glass fiber membrane has capillary fiber structure, can absorb more water than the equivalent of cellulose Filter Membrane, has the characteristics of the moisture absorption and biological inert, except hydrofluoric acid and high concentration of acid and alkali; The glass fiber membrane also has good chemical corrosion resistance for most of the solvents and reagents. It can be suitable for sample analysis and liquid flash count method. The glass fiber membrane also can be made completely transparent for subsequent microscopic examination.  

Features and Benefits

1.   Remain the fine particles, fast flow rate, and high load

2.   Wet strength, higher load

3.   The filtering speed is faster than general cellulose under the same condition of the particle retention. The membrane is thicker with strong load.

Application:

1.   Applied for high efficiency filter, including waste water detection, Water Filtration, algae.bacteria cultivation and food analysis, protein filtration and weak determination of free beta launcher, recommended for weight determination of particulate matter in the air pollution monitoring, stack sampling and adsorption, etc.

2.    Applied to keep tiny particles with fast flow rate. Especially suitable for the liquid clarification or the sample processing of fine particles in particle high quantitative suspension. Pre-filtration of the fine particulate matter, to make the LSC and protein binding.

3.   Used in the standard filter paper to collect the suspended matter of drinking water, natural water and industrial waste water. Quickly and effectively to clarify aqueous solution containing small to medium small grain. Widely used for collecting liquid flash count and determined the combination with higher load.

4.   Common membrane filtration materials, can be used with GF/PP to provide a very useful classification for the membrane.

5.   Used for DNA binding, adsorption and purification of protein binding, the filter effect of filtering tiny protein precipitation is obvious, GF/F AND GF/D can be used as a pre-filter membrane to clarify the biochemical solution, fluid and nucleic acids.

6.   Used in the automatic Air Filtration devices in roll membranes.

Technical parameter of the composite glass fiber filter paper

Glass Fiber Filter Membrane

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