6 results about "Compressibility factor" patented technology

The invention relates to the technical field of gas disaster prevention and control, and discloses an experiment and calculation method for accurately measuring the initial velocity of coal seam gas diffusion. According to the experimental method, a gas diffusion space volume measurement step is added, a coal sample is loaded into a sample tube and subjected to vacuum degassing, helium with set pressure is introduced into a fixed space, pressure values in different states are recorded, and the volume of the gas diffusion space is accurately calculated in combination with a compression factor solved by a Lee-Kesler equation, so that the volume of the gas diffusion space is calculated. The problem of gas emission space volume inconsistency caused by coal sample physical property difference is solved. The calculation method is optimized, the accurately measured gas emission space volume is included, gas compression factors are considered, a compensation model is established, the idealized hypothesis that gas is regarded as incompressible fluid in a traditional method is broken through, errors caused by volume difference and gas compressibility are corrected, and the gas emission space volume is calculated. The accuracy and reliability of the calculation result of the initial velocity of coal seam gas diffusion are remarkably improved, and scientific data support is provided for coal and gas outburst risk judgment.

This invention discloses a method, apparatus, equipment, and medium for predicting the dew point pressure of condensate gas. The method includes: inputting basic data of a condensate gas sample and initializing the dew point pressure value; using the 4CM splitting method to split and characterize the C7+ component in the condensate gas; estimating the gas-liquid phase equilibrium constant and the mole fraction of each component in the liquid phase based on the mole fraction of each component after splitting; calculating the gas-liquid phase compressibility factor using the improved equation of state (MPR) based on the gas-liquid phase equilibrium constant, the mole fraction of each component in the liquid phase, and the relevant data after characterization; determining whether the absolute value of the difference between the gas and liquid phase fugacity satisfies the equilibrium condition and whether the sum of the mole fractions of each component in the liquid phase satisfies the preset convergence condition; and finally outputting the calculated dew point pressure. This invention utilizes an integrated and innovative method for thermodynamic model construction, resulting in high accuracy and low calculation error in predicting the dew point pressure of condensate gas.

This application relates to the field of gas transportation technology, and provides an equivalent inertia correction method and apparatus for a lumped parameter model of a gas pipeline. The method includes: generating a lumped parameter model of the gas pipeline based on the continuity equation and momentum equation of a one-dimensional compressible gas; generating an equivalent inertia factor based on the equation of state of a real gas under isothermal conditions; wherein the equivalent inertia factor characterizes the nonlinear sensitivity of the compressibility factor of the real gas to pressure; correcting the equivalent inertia of the lumped parameter model based on the equivalent inertia factor; and updating the boundary values ​​of the lumped parameter model after correction based on the fluid sound velocity under the current operating conditions of the gas pipeline and the pipeline length constraint when a system disturbance occurs. The method provided in this application effectively compensates for the inertial distortion caused by lumped averaging of material properties and solves the global phase shift problem under complex operating conditions.

The invention discloses a multi-component gas continuous curve synchronous adsorption analyzer and an operation method thereof.The analyzer comprises a gas distribution system, a high-pressure-resistant adsorption system, a precise pressure control system, a gas chromatography combined sampling system, a vacuum and desorption system and a data acquisition and processing system; the method comprises the following steps of: testing a plurality of pressure points, ensuring that the test of each pressure point is started under a brand-new background, calculating a mixed gas compression factor by a data acquisition and processing system based on the combination of multi-parameter state equations such as a Peng-Robinson state equation or a Sove-Redlich-Kwong equation, and synchronously inversely calculating the adsorption capacity of each component under different pressures through material balance, so as to obtain the adsorption capacity of each component under different pressures. And finally generating a multi-component adsorption continuous curve. According to the invention, continuous, synchronous and accurate measurement of multi-component gas adsorption behaviors can be realized.

The invention discloses a method for calculating the carbon sequestration amount of a goaf grouting fire preventing and extinguishing material, the carbon sequestration amount of the material is calculated according to the pressure intensity and temperature change of an initial state and an end state in a closed reactor, and the calculation method comprises the following steps: S1, based on a PR state equation, calculating a gas phase compression coefficient in the initial state; s2, calculating the mole fraction of carbon dioxide and the mole fraction of water vapor in the gas phase in the end state when the water vapor in the gas phase is saturated in the end state; s3, based on a mixing rule and a PR state equation, calculating a gas phase compression coefficient in an end state; s4, calculating the molar weight of the carbon dioxide in the gas phase in the initial state and the molar weight of the carbon dioxide in the gas phase in the end state by considering the influence of the compression coefficient and the water vapor; s5, in combination with an activity coefficient method and an electrolyte NRTL model, calculating the mole fraction of carbon dioxide in the liquid phase in an end state; and S6, obtaining the carbon sequestration amount of the material according to the difference between the carbon dioxide amount in the initial state and the carbon dioxide amount in the end state.

The invention provides a method, a device, equipment and a medium for determining the pressurization performance of a cryogenic propellant storage tank, and the method comprises the steps: building a physical property data table for various pressurization gases in the cryogenic propellant storage tank; establishing a first control equation of a liquid phase region and a second control equation of a gas phase region, wherein the second control equation is obtained based on an ideal gas state equation corrected by a gas compression factor; determining a target physical property parameter of the mixed gas at the current iteration time based on the physical property data table, and performing iterative calculation based on the target physical property parameter, the first control equation and the second control equation to obtain a change curve of the pressure and the temperature of the mixed gas along with time change; and determining the pressurization performance of the cryogenic propellant storage tank based on the change curve. According to the method, through the ideal gas state equation corrected by the gas compression factor and the calculation of the target physical property parameters of the mixed gas, the calculation complexity of the pressurization process of the low-temperature propellant storage tank is reduced.