The biomass burning machine needs to work under negative pressure. At the same time, the ID fan must be installed to ensure the negative pressure. If it is applied to aluminum melting furnace, greenhouse heating, drying room and other working conditions, it can be operated at slightly positive pressure. However, it is necessary to ensure the smooth flow of the flue; the cross-sectional area of the exhaust outlet and the power of the induced draft fan will be carried out according to the requirements specified by the engineering department of our company.
It must be equipped with a special operator to operate, the operator must be guided by the machine can operate the machine. If the product is used in a boiler, it should be submitted to a qualified boiler installation company for installation. If there is a size deviation due to the size of the burner mouthpiece, the size of the boiler's crater must be corrected. The product must be reported to the local boiler inspection office for approval. Qualified boiler maintenance unit. Biomass Burner,Biomass Granule Burner,Biomass Burning Furnace,Biomass Fuels Furnace Jinan Shanghangda Machinery Co., Ltd. , https://www.shdmachines.com
Valve noise causes three major causes
The causes of noise generated by the valve can be divided into the following three categories: 1. Pressure reducing valve mechanical vibration noise; 2. Fluid dynamics noise; 3. Aerodynamic noise. First, the noise generated by mechanical noise Reducing valve components in the fluid flow will produce mechanical vibration, mechanical vibration can be divided into two forms: ①low-frequency vibration. This vibration is caused by the jet and pulsation of the medium due to the flow velocity at the outlet of the valve being too fast, the piping arrangement unreasonable, and the rigidity of the valve movable part being insufficient. ② high-frequency vibration. This vibration causes resonance when the natural frequency of the valve and the excitation frequency caused by the medium flow are the same. It is generated by the pressure reducing valve within a certain pressure reduction range, and the noise variation is large once the conditions are slightly changed . This mechanical vibration noise has nothing to do with the medium flow rate, mostly due to the unreasonable design of the valve itself. Measures to reduce the mechanical vibration noise is to reasonably design the clearance between the valve sleeve and the valve stem, the machining accuracy, the natural frequency of the valve and the rigidity of the movable parts, and the proper choice of materials. Second, hydrodynamic noise Hydrodynamic noise is generated by the fluid after turbulence and vortex flow through the decompression valve after the pressure relief valve, the resulting process can be divided into two stages: ①turbulence noise, that is, by the turbulent The noise generated by the interaction between the fluid stream and the relief valve or the inner surface of the pipe is relatively low in frequency and noise level and generally does not constitute a noise problem. ② cavitation noise, that is, the pressure reducing valve in the decompression process, when the fluid flow rate reaches a certain value, the fluid (liquid) began to vaporize, when the pressure in the liquid bubbles to a certain value, it will explode. Bubbles in the explosion, to produce local high pressure and shock wave, the impact of pressure up to 196 MPa, but away from the center of the explosion, the pressure decay sharply. This shock wave is a major contributor to cavitation and noise in the regulator. The measure to reduce mechanical vibration noise is to design the pressure reducing valve such that the pressure reducing value of the pressure reducing valve must be controlled below the critical value and preferably below the initial value of Δp because the actual pressure reducing value of the pressure reducing valve reaches At the initial value of Δp, cavitation begins to develop in the liquid and the noise will increase sharply. In addition, pay attention to the flow direction of the fluid medium relative to the flap. Third, the aerodynamic noise When the compressible fluid such as steam through the decompression valve within the decompression part, the mechanical energy of the fluid into sound and the noise generated is called aerodynamic noise. This kind of noise is a type of noise that makes up the majority of the noise in the pressure reducing valve and is the most troublesome to handle. The reason for this noise is divided into two situations, one is due to turbulence generated by the fluid, the second is due to the fluid to reach the critical flow rate caused by the shock wave. Aerodynamic noise can not be completely eliminated because it is inevitable that the pressure relief valve causes fluid turbulence when depressurized. In summary, fundamentally speaking, the noise generated by the pressure reducing valve is related to its own design and manufacturing process.