The application of the rotary spring in the tubular air preheater â–¡ Zhu Liming Our factory supplies the tube air heat, the outer diameter of the tube is 40 stomach, the wall thickness is 1.5, and the tube plate is welded on both ends. Fixed with a frame. The advantage of the heat exchanger is that the structure is combined and the heat transfer efficiency is separated. The disadvantage is that the pipe is easy to be ash and clogged, and often shuts down the furnace to clean the ash, causing losses to the enterprise. Due to the limitation of the installation position, the pipe is not easy to be renewed, and the pipe is slender and the ash is very difficult.
In order to solve the problem of ash clogging in the preheater, we analyzed the cause of ashing from the flue gas flow pattern. Since the current of the induced draft fan is basically stable, it can be inferred that after the air pre-station field, the Weng set â–¡ Lou Yu Xuan Kang, our factory 4, 080 centerless grinding machine, mainly used for the processing of Shaft parts, the original manual feeding, in order to meet the production needs , our factory has carried out transformation, 1.
The amount of smoke from the heat exchanger is also basically stable. Therefore, when the flow type of the flue gas in the tube is laminar or transitional, the laminar flow is turbulent, and the flow velocity at the tube wall is minimized regardless of the flow of the layer, so that the soot is easily adhered to the tube wall. Especially in laminar or transitional flow, the soot adhering to the pipe wall cannot be agitated, causing the spar to ash. Therefore, by changing the fluid flow state, the fluid can be moved in a flow mode to allow the flue gas to adhere to the soot on the pipe wall to avoid the ash blockage by the Reynolds number calculation formula; =, it can be known that the Reynolds number and the pipe The diameter of the flue gas is proportional to the density and inversely proportional to the dynamic viscosity. To make the laminar flow into the pool flow, it must be increased or decreased. However, in the case of the load coal quality, the flue gas flow rate remains basically unchanged. Change, smoke density, dynamic viscosity, can not, change, so to change the flow state only change the diameter of the heat exchanger tube. However, after the pipe diameter is increased, the heat exchange area of ​​the air preheater is reduced, and the outer shape of the heat exchanger is fixed, and the color effect is hot, so the pipe diameter cannot be increased indefinitely. The fluid resistance must be changed to exacerbate the internal friction between the fluid particles, allowing the flowing flue gas to agitate the pipe wall soot and carry it away to avoid clogging.
We conducted a number of feasibility tests and finally decided to change the diameter of the tube from the original 40 to 47. And install a cylinder in the pipe, and rotate the spring. The bottle body creates a vortex under the action of the resistance of the magazine, thereby agitating the soot. It is worth noting that the cross section of the spring steel wire is not suitable for the 囫 shape, because the circular shape is easy to form a gap with the pipe wall, and the soot is easy to be sewn and bonded, and a square shape should be adopted.
After the renovation of 2 boilers and 1 boiler in our factory, after more than one year of operation, there is still no ashing in the pipe. Moreover, the exhaust heat utilization rate of the exhaust gas is increased, and the exhaust gas temperature of the boiler is about 190 before the transformation of about 80 degrees.
The rack 4 is fixed on the swash plate 3, and the shaft material is arranged in a neatly arranged manner, and the bottom has a port. The plate 2 is driven by the cylinder 1 to move up and down in the rack. The introduced shaft material is freely rolled down to the belt 9 along the sliding plate, and the speed of the motor 10 is appropriately adjusted or the corresponding pulley is selected to obtain a uniform feeding rhythm. The proximity switch 6 is mounted on the board 8 for controlling the distribution of the cylinder 1 .
Appropriate adjustment of the position of the side plates can be suitable for processing shaft materials of different diameters, and an anti-flow device 7 and a plexiglass baffle are installed at the front end of the belt line to prevent backflow and splashing of the cutting fluid.
7. During the ascending process of the pallet 2, the shaft 6 is pushed up, and the shaft 1 is dropped under the action of gravity, so that only the root shaft is pushed out every time the pallet is lifted.
Therefore, the transformation investment is small, the production is simple, and the operation is safe. This machine can be used to connect multiple grinding machines for various processes.
No. 310006, edited by Li Wen
Energy And Power Field
In the field of energy power, the improvement of efficiency and the extension of life span have very demanding requirements on material performance and structural design. Silicon carbide ceramic materials outperform most metallic materials in terms of specific stiffness, thermal shock resistance, friction and wear resistance, and thermal conductivity, but they are difficult to machine and cannot be used on a large scale.
FLK has achieved a breakthrough in the manufacturing technology of integrated complex components made of silicon carbide ceramics by using additive manufacturing technology.High strength, high rigidity, high stiffness, light weight: density 280-3.05g/cm, low energy consumption, good thermal shock resistance, low coefficient of thermal expansion, compared to metal parts, 3D printed silicon carbide ceramic parts can extend their service life by more than one time, reduce energy consumption, and meet extreme working conditions.
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