Application of Ruitai elbow flow meter in Fujian Sangang

Abstract: The application information of Ruitai elbow flowmeter in Fujian Sangang is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. When the flow meter detects the parameters of the measured fluid, it will lead to the loss of the energy of the measured fluid. In the field of flow detection of gaseous media such as steam and natural gas, orifice flowmeters are widely used. The flow meter also becomes the energy while realizing the effective measurement. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of Ruitai elbow flowmeters in Fujian Sangang. When the flow meter detects the parameters of the measured fluid, it will lead to the loss of the energy of the measured fluid. In the field of flow detection of gaseous media such as steam and natural gas, orifice flowmeters are widely used. Flow meters have become an important factor in energy loss while achieving effective measurement. Scientific selection of flow meters to effectively solve the contradiction between accurate metering and energy consumption of metering meters is an important task to do a good job in energy metering. After theoretical analysis and practical summary, we propose to replace the common orifice type differential pressure flow measurement device with elbow flowmeter as much as possible in the gas flow measurement, which can not only accurately measure the gas flow, but also eliminate the orifice throttling device. pressure loss to achieve energy saving effect. 1 Measuring principle and energy saving principle of elbow flowmeter 1.1 Measuring principle of elbow flowmeter When the fluid flows through the elbow, due to the diversion effect of the curved tube wall, the inner flow rate of the fluid will gradually increase when it flows into the elbow. However, the outer flow velocity gradually decreases, which forms an approximate trapezoidal velocity distribution of each flow section, and this trapezoidal velocity distribution is distributed in the elbow 45.°The limit state is reached at the cross section. Elbow 45°The flow velocity distribution at each particle point of the cross section is shown in Figure 1. Due to the complexity of the fluid flowing through the elbow flowmeter, it is impossible for us to deduce a simple mathematical expression by the usual theoretical methods, but only by means of the dimensional analysis method to establish a form that covers all possible influencing factors on complex mathematical expressions. According to the principle of dimensional analysis: the relationship between the average flow velocity v of the fluid flowing through the elbow flowmeter and the pressure difference Δp inside and outside the elbow can be expressed by Euler's number Eu: where Re is the Reynolds number; Fr is the Ferroude number ; Ma is the Mach number; R/D is the bending diameter ratio; L1, L2 are the lengths of the front and rear straight pipes; (λ1,λ2) Indicates the position of the outer pressure-taking hole; (λ3,λ4) Indicates the position of the inner pressure-taking hole; Δ is the roughness of the inner wall of the pipe;β1,β2 is the angle between the front and rear straight pipe sections and the elbow. According to the definition of Euler's number Eu, the above formula can be further rewritten as: Equation (3) establishes the working principle expression of the fluid flowing through the elbow flowmeter. According to the definition of Euler's number Eu, the working principle of the elbow flowmeter can be expressed is: the kinetic energy of the fluid flowing through the elbow flowmeter (ρν2) is proportional to the pressure difference (Δp) between the inside and outside of the elbow. Its proportional coefficient (flow coefficient)αIt is Reynolds number, Ferroude number, Mach number, bend diameter ratio, length of front and rear straight pipe sections, position of pressure taking holes (inside and outside), connection angle between straight pipe section and elbow, roughness of the inner surface of elbow and other influencing factors The function. Equation (4) gives the theoretical flow coefficientαThe function expression of , the coefficient can be determined by solving the Navier-—Stokes differential equations are determined. 1.2 Energy saving principle of elbow flowmeter For thermal power generation enterprises, whether elbow flowmeter has energy saving effect in place of orifice throttling device can be indirectly calculated through the steam turbine power of the generator set. The throttling of the orifice plate will reduce the steam pressure, which means that the working capacity is reduced, resulting in irrecoverable energy loss. The pressure loss generated by the orifice plate is usually calculated according to formula (5): where:βis the diameter ratio of the throttling part; Δp is the differential pressure value of the throttling orifice (kPa). Calculation of the steam turbine power Pi of the generator set: In the formula: D is the steam flow rate of the steam turbine unit; h0 is the steam enthalpy value of the steam inlet; hh is the heating steam enthalpy value;ηi is the relative internal efficiency of the steam turbine (about 82%);ηm is the mechanical efficiency of the steam turbine (about 98%);ηg is the generator efficiency (about 98%); the initial parameters (inlet steam parameters) p1, T1, h1 and extraction steam parameters p2, T2, h2 directly affect the power of the steam turbine. In order to monitor and measure the needs of power plants, throttling orifice plates are usually installed on the pipes at the boiler outlet and steam turbine inlet, resulting in a decrease in the initial pressure p1; throttling orifice plates are installed in the steam supply main pipe outside the steam turbine, resulting in the total outlet steam pressure of the heating supply. The increase of p2, the change of these two parameters will cause the reduction of the effective power generation of the steam turbine. The elbow flowmeter is installed at the bend of the pipeline, replacing the existing elbow, without adding new resistance, so the quality of the steam will not be degraded in use. If the orifice plate throttling device is replaced by the elbow flowmeter, the initial pressure p1 of the steam turbine will be increased and the total outlet pressure p2 of the heating supply will be reduced under the condition that the boiler outlet pressure remains unchanged, thereby improving the power generation efficiency of the steam turbine and reducing the damage caused by the throttling element. energy loss, to achieve the purpose of energy saving.

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