The air compressor current in Jiangsu motor engineering time can be seen, and the air compressor should complete the switching of adding and unloading within 20s. Taking the Atlas GA132 air compressor used by the company as an example, the switching of loading and unloading is controlled by the unloading valve. The working principle is as shown in the figure.
In the loading state, the control airflow enters through the air inlet hole, and the pressure at the outlet of the main pipe exceeds the required gas production amount. When the pressure of the main pipe is higher than 0.8 MPa, the second automatic unloading (the amount of compressed air used per unit time is not Constant and uncontrollable, it is impossible to design a constant gas volume, which can only be achieved by the addition and unloading of the air compressor. The current curve of the second air compressor is as shown.
As a driving force, compressed air plays a very important role and is the power source for pneumatic instruments and control equipment. In power generation enterprises, the compressed air pressure and dryness of the instrument are necessary indicators to ensure the safe and stable operation of the system (GB/T1327741* indicates the compressed air quality level). Power generation companies use two or more units to share a single compressed air system, which puts higher demands on the quality of compressed air. In many practical applications, when the compressed air system is put into use, more compressed air is required as the later gas equipment increases.
However, when the gas production amount and the processing amount of the compressed air production equipment (air compressor) and the aftertreatment equipment (dryer) are still satisfied, there is often a problem that the circulation pipeline cannot ensure the circulation of the compressed air. The paper analyzes the causes of the above problems and proposes a pipeline transformation plan.
1 Fault situation and analysis Since 2008, the compressed air system of units 6 and 7 of a power generation enterprise has frequently failed to maintain air pressure and frequent addition and unloading of air compressors. When the air pressure is the lowest, it can only maintain 0.55MPa, which is far lower than the 0.65MPa of the safe operation of the unit. The monitoring of the data of each measuring point of the system shows that the pressure of the mother tube between the air compressor outlet and the air dryer inlet fluctuates frequently (such as Show). The parent tube pressure curve completes the switching of the secondary peaks and troughs within 20 seconds. At this time, the air pressure cannot be maintained, that is, the compressed air generated by the air compressor accumulates in the short time between the air compressor and the dryer, causing the pressure to plummet, but the dryer outlet cannot generate enough compressed air. In order to maintain the output pressure as much as possible, only the bypass system of the dryer can be turned on, so that a part of the compressed air is directly output without passing through the dryer. This inevitably results in failure of the compressed air aftertreatment equipment and the removal of moisture from the compressed air. Most of the pneumatic equipment has electrical components and leads at the same time. Once the incoming compressed air contains moisture, it is extremely harmful.
The loading and unloading of the air compressor is automatically switched according to the pressure of the main pipe.
Take the company as an example: one air compressor is continuously loaded, but it cannot produce enough compressed air. When the pressure of the mother pipe is lower than 0.69MPa, the other air compressor is automatically loaded. Analysis and Reconstruction of Compressed Air Generated by Two Air Compressors and Frequent Fluctuation of Compressed Air Main Pipe Pressure of a Generator Set Liang Mei (Jiangsu Xutang Power Generation Co., Ltd., Zhangzhou 221300, Jiangsu Province) analyzed the causes of the problems and calculated the analysis. The basic requirements of pipeline reform were put forward, and the on-site pipeline reconstruction scheme of buffered gas storage tank was proposed, and the modification scheme was used to illustrate the effectiveness of the transformation scheme.
f machine out of Yan Shunlin, Yang Yuhuan. Study on separation performance of rotary pulverized coal separator. Power Science and Li Xiaojian (1982), male, Lianyungang, Jiangsu, engineer, engaged in energy-saving management of thermal power plants; Wei Dan (1982), female, Yangzhou, Jiangsu, economist, engaged in the centralized control operation of thermal power plants.
(Continued from page 73) 3 Concluding remarks The failure of the instrument air pressure can not be maintained stably and the air compressor is frequently added and unloaded. It is found that the mother tube volume is too small, causing frequent and unloading of the air compressor is the direct cause. After the buffer air tank is added to the air compressor main pipe, the structure of the compressed air system is more reasonable, and the failure of frequent loading and unloading is solved.
Expanded Steel Diamond Mesh is another kind of metal screen industry, which is also one of the main varieties of metal plate mesh. Also known as expanded metal mesh, expanded diamond mesh, expanded metal lath, heavy steel plate net, foot net, punching plate, etc. After the steel mesh punching machine processing, the metal plate becomes a mesh with mesh of diamond.
Size: Opening size (mm): 2.5-50mm or according to customers` requirements
Thickness (mm): 0.5-10mm or according to customers` requirements
Material: High quality low carbon steel plate, aluminum plate, SS plate, titanium plate, aluminum foil plate, nickel plate, galvanized plate etc.
Surface Treatment: Galvanized, spraying antirust paint, anodic oxidation, PVC coated, powder coated
Use: Expanded sheet used for filter, medicine, papermaking, filtering, breeding, cell network, packaging net, mechanical facilities protection, handicraft manufacturing, high-end speaker net enclosures, decoration, child seat, basket, basket and road protection, foot tanker net, heavy machinery and boilers, oil mine, locomotive, million tons of ships such as working platforms, escalators, walkways. It can also be used for reinforcing steel bars in construction industry, highway and bridge.
Products Structure:
SWM: The length of a short diamond diagonal from a node
center to a node center
LWM: The length of the long diagonal line
from the center of the node to the center of the node
SWO: The length of the diagonal of a short
diamond
LWO: The length of the diagonal of a long
diamond
Strand Width: The length of the edge of the
diamond - shaped hole
Strand Thickness: Thickness of steel plate
Knuckle: Connection points of two mesh holes
Expanded Metal Process
If you are curious about how the process of forming expanded metal mesh, XinZheng is happy to provide you with a step-by-step guide to manufacturing these products on our state-of-the-art equipment.
1. Sheet or plate is advanced beyond the face of the bottom die in an amount equal to the strand width before flattening. The sheets are then fed into an expanding machine.
2. The top die then descends and simultaneously slits and cold forms an entire row of half diamonds.
3. The top die then ascends and moves one half of a diamond to the right as the base sheet or plate moves forward one strand width.
4. The top die descends, slits and forms another full row of half-diamonds completing a row of full diamonds in two strokes.
5. The die then ascends and returns to its initial position.
This process then continually repeats until the full sheet of expanded metal is completed. This mesh is then either cut into sheets or rolled into coils for either shipping or additional processing.
Please see the images below to view the expanded metal process:
Expanded Steel Diamond Mesh,Steel Diamond Mesh,Aluminium Expanded Mesh ,Expanded Metal Sheet
Anping Xinzheng Metal Wire Mesh Co., Ltd , https://www.sievingmesh.com