The number of nozzles and the installation position and direction design principles: (1) When determining the position and direction of the nozzle, high pressure nitrogen should be applied directly to the non-working surface of the blade. (2) The reason why the nozzle is set at the same time at the inlet and outlet of the impeller is to have an effective effect on the ash on the non-working surface of the entire blade through the joint action of the impeller inlet and outlet jet systems. (3) The nozzle outlet shape design considers its effective range of action, gas flow blockage, and effective force on the non-working surface of the blade. (4) The installation position of the injection system on the casing is not changed, that is, the installation position of the existing water injection system is the same. According to the above principles, the following structural forms are designed. Two sets of injection systems are installed at the position where the impeller inlet is cleaned by the original water spray (the casing), and the nozzle outlet direction coincides with the radial direction of the impeller; the original water spray cleaning position at the impeller outlet (the casing) On the top, one set of injection system is installed, and the nozzle outlet direction is horizontal. Compared with the structure of the water spray system, the impeller inlet jet system changes the nozzle shape; the second is to clarify the nozzle direction. The structure of the impeller outlet jet system, compared with the structure of the water spray system, firstly changes the shape of the nozzle, and secondly, changes the position of the nozzle. Supply air pressure, exhaust speed and air volume supply pressure design principles: (1) The pressure required to consider the flow resistance of the system; (2) The maximum pressure at which the gas flow is blocked. When the maximum jet velocity is guaranteed, the required jet pressure p01 at the nozzle is (2/k+1)-k/k-1U0.196MPav01=(kRT/k-1)1/2, and the gas at the nozzle outlet can be obtained. The ultimate speed is 700m/s, and the gas velocity in the pipeline is R=297v0=v01p01p1 is the gas constant; k=1.4 is the adiabatic index; T=472 is the absolute temperature. v=0.686=200m/s When the guaranteed flow rate is 200m/s, according to the resistance loss calculation formula hf=KLv22dg along the path, take K=0.02, L=5m, d=010254m. At the same time take the local resistance loss hm=2hf, overcome The pressure required for the flow resistance loss p02=hm+hf=0.294MPa Considering the fluctuation of the supply pressure and the safety of the jet operation, taking the safety factor of 1.2, the supply pressure p0=(p01+p02)@1.2=0.588MPa That is, the compressed nitrogen having a pressure of 0.588 MPa can exert an effective force on the adherend on the blade. In actual operation, due to the existing 0.686 MPa compressed nitrogen gas source in the workshop, the actual operation is carried out with 0.686 MPa of nitrogen gas. In every 2 steelmaking steelmaking cycles (about 40 minutes per furnace steelmaking cycle), high pressure nitrogen gas is sprayed for 1 minute. . Spraying high-pressure nitrogen can be carried out at the beginning of the gas release period, so that it will not affect the gas recovery (including gas composition, gas dust concentration, etc.). Gas supply pipeline design and design principles: (1) minimize the gas flow resistance of the pipeline system; (2) use the existing nitrogen source (0.686 MPa) in the equipment room. Connect this line directly to the existing nitrogen line in the fan room. No-alkali accelerator are used to increase the rate of concrete strength development or to reduce concrete setting time. It is non-toxic, non-corrosive, non-flammable, chlorine-free, harmless to human health, low in springback, no dust and no pollution during construction, which can greatly improve the construction environment . Concrete Accelerator,Cement Accelerator,Accelerating Admixtures,Concrete Accelerator Admixture NINGBO LUCKY CHEMICAL INDUSTRY CO. LTD , https://www.nbluckychem.com
Fan nozzle and piping design principles
Design and operation of high-pressure nitrogen blowing and cleaning The introduction of foreign materials shows that the use of specially developed nozzles to blow compressed air is very effective in cleaning the adhering deposits adhering to the inlet section of the blade and the trailing edge of the blade. For the fan of this system, considering the reliability of the operation of the gas system, the impeller is sprayed and cleaned with high-pressure nitrogen, and the design scheme is as follows.