22 results about "Specific volume" patented technology

To obtain injection outlet flow rate and quality that strictly satisfy energy conservation formulas of thermodynamics and hydrodynamics in gas-liquid two-phase jet flow.SOLUTION: A method for calculating flow rate and quality of gas-liquid two-phase jet flow ejected from an injection outlet into which liquid flows includes: a step S1 of obtaining mass flow rate and specific enthalpy of liquid; a step S2 of obtaining specific volume and specific enthalpy of gas phase and liquid phase of the gas-liquid two-phase jet flow; a step S3 of calculating mass flow rate of the gas phase of the gas-liquid two-phase jet flow at an injection outlet; and a step S4 of calculating flow rate and quality of the gas-liquid two-phase jet flow.SELECTED DRAWING: Figure 10

The invention relates to a heavy hammer for hydrographic survey, and belongs to the technical field of hydrographic survey instruments. The design of the heavy hammer is based on taking a volume V, a material density rho and a shape parameter as core decision variables and taking a minimum mass m as a target function; the optimal mathematical model meets the requirements of a water surface tension change threshold value delta T1 caused by buoyancy, a water bottom tension change threshold value delta T2 caused by water bottom support, a terminal sinking speed threshold value vmin, the maximum mass gamma < = 0.5 kg and the maximum boundary dimension constraint. The heavy hammer is spherical, drop-shaped or torpedo-shaped, specific volume, density and mass parameters are obtained through optimization calculation, and high-tension detection sensitivity and rapid sinking efficiency are achieved while portability is ensured. Preferably, the heavy hammer is of a separable assembly type structure, and a containing cavity and a counterweight metal block are arranged in the heavy hammer so as to adjust the density and the mass. According to the system, the problem of contradiction between performance indexes in heavy hammer design is solved, and the comprehensive measurement performance is remarkably improved.

The application discloses a horizontal two-stage screw compressor with efficient inter-stage cooling structure and relates to the field of screw compressors.The horizontal two-stage screw compressor with efficient inter-stage cooling structure comprises a first-stage host assembly, a second-stage host assembly and an inter-stage connecting assembly.The horizontal two-stage screw compressor with efficient inter-stage cooling structure has the beneficial effects that the inter-stage connecting cavity can efficiently cool the inter-stage compressed gas through the built-in cooling core structure, the second-stage compression inlet gas temperature is reduced, the second-stage compression power consumption is reduced, the overall compression efficiency is improved, the specific volume of the high-temperature gas is reduced after cooling, the second-stage compression inlet gas volume is increased, the actual exhaust volume of the host is improved, the first-stage and second-stage host assemblies are provided with gear transmission structures to realize the stepwise speed change of the double-gear transmission structure, the differentiated requirements of pressure, flow and rotating speed of the two-stage compression are adapted, the unit vibration and noise are reduced, the operation stability is improved, the gas compression power consumption is reduced, and the overall working efficiency is improved.

This invention provides a method for analyzing the impurity content of liquid carbon dioxide in a pressure storage tank, comprising: determining the gas phase mole fraction and thermodynamic parameters of each component in the pressure storage tank before taking out a specific volume of liquid carbon dioxide from the bottom of the tank; calculating the gas-liquid equilibrium constant, mole number, and mole fraction of each component in the pressure storage tank before taking out the liquid; calculating the liquid phase mole fraction of each component in the pressure storage tank before taking out the liquid; calculating the mole fraction of each component in the pressure storage tank after taking out the specific volume of liquid carbon dioxide; and determining the impurity content of the liquid carbon dioxide in the pressure storage tank after taking out the specific volume of liquid carbon dioxide. This invention enables dynamic analysis of the impurity content of liquid carbon dioxide in pressure storage tanks, solving the problems of high difficulty and low accuracy in measuring the composition of impurities in liquid carbon dioxide in pressure storage tanks, and providing a basis for subsequent research on carbon dioxide pipeline transportation technology.

The invention provides a rapid performance analysis method for a thermal protection phase change cooling structure. The rapid performance analysis method comprises the following steps: carrying out geometric simplification and grid division on a phase change cooling system; setting related material physical property parameters and interaction boundary conditions; performing theoretical analysis on a main heat source of the phase change cooling system, and selecting a thermal boundary condition method; the comprehensive density, the cooling liquid heat specific volume and the cooling liquid heat conductivity after the cooling liquid and the liquid storage medium are combined are calculated, and the gas production starting time and the vaporization amount are obtained through simulation; performing risk assessment on the phase change cooling structure, and assessing the risk generated when the produced gas enters the corresponding thermal environment; and repeating the steps to obtain a design scheme of the phase change cooling system in the high-heat area of the aircraft with a certain engineering margin. By applying the technical scheme, the technical problems that in the prior art, a test method is long in preparation period and high in cost, the use environment of the phase change cooling system is difficult to completely recover, and effective guidance is difficult to provide at the initial stage of design are solved.

The invention discloses a method for calculating the influence of heat disturbance on the steam temperature of an intermediate point of a once-through furnace and a related product, and belongs to the technical field of thermal equipment performance state diagnosis. According to the method for calculating the influence of the heat disturbance on the steam temperature of the intermediate point of the once-through furnace, a reasonable relational expression is constructed on the basis of the basic principle of fluid mechanics, the first law of thermodynamics and the basic principle of differential by utilizing the function relation between the enthalpy value of a working medium and the specific volume of steam; obtaining a fifth relational expression of steam temperature change of the intermediate point of the once-through furnace under heat disturbance through step-by-step derivation; according to the method, tedious parameter collection and complex operation are not needed, the problems that a traditional method is tedious in calculation and long in consumed time are solved, quantitative influence data of heat change on the steam temperature of the intermediate point of the direct-current furnace can be rapidly and accurately calculated, an operator can rapidly diagnose the performance of the direct-current furnace according to the accurate calculation result, and the efficiency of the direct-current furnace is improved. Potential problems are found in time, unit operation parameters are adjusted, and therefore safe and stable operation of the unit is guaranteed.

The invention discloses a supercritical carbon dioxide compressor isentropic work calculation method based on an actual isentropic index, which comprises the following steps of: giving an inlet temperature, an inlet pressure, an outlet temperature and an outlet pressure of a compressor, and segmenting a temperature interval of the inlet temperature and the outlet temperature of the compressor, the pressure interval of the inlet pressure and the pressure interval of the outlet pressure are also segmented correspondingly; according to the segmentation result, the specific volume, the actual constant volume specific heat, the isothermal partial derivative item, the constant volume partial derivative item, the actual constant pressure specific heat and the actual pressure-specific volume isentropic index of the actual gas carbon dioxide are calculated; taking an average value of two end points of a sub-interval of the actual pressure-specific volume isentropic index in the ith interval as an average pressure-specific volume isentropic index of the ith interval, and calculating isentropic work of the ith interval; and for each interval, calculating all isentropic power, and summing calculation results of all the intervals to obtain an isentropic power predicted value. According to the method, the thermodynamic behavior of the supercritical carbon dioxide under the actual working condition can be reflected more accurately.

The invention discloses a method and a system for calculating heat transfer and hydrodynamic characteristics of a vertical evaporation tube of a once-through boiler. The method comprises the following steps: firstly, collecting boiler operation data and boiler equipment data; according to different boiler types, the vertical evaporation pipes are divided into a plurality of different pipe sections according to the connection modes of the vertical evaporation pipes; and based on the obtained boiler operation data, the enthalpy value of each pipe section is calculated, and then the average specific volume of the working medium in the pipe is deduced through the enthalpy values, so that the average specific volume value of each pipe section is obtained. And further analyzing by utilizing boiler equipment data and the average specific volume of each pipe section to obtain the dynamic characteristics of each pipe section. And finally, boiler operation data and equipment data are integrated, and the heat transfer distribution condition of each pipe section is evaluated and obtained. According to the method, an effective calculation means is provided for accurately analyzing the thermal hydraulic performance of the vertical evaporation pipe of the once-through boiler, a scientific basis is provided for safe operation and performance improvement of the boiler, boiler configuration can be adjusted according to heat transfer and dynamic characteristics, and safe operation of the boiler is guaranteed.

The invention relates to a pulsating differential pressure flow meter, and belongs to the technical field of flow measuring devices, the pulsating differential pressure flow meter comprises a base and a pipe body detachably connected with the base, a generating body is arranged in the pipe body, and the generating body comprises a generating body bottom plate and a generating body body arranged on the generating body bottom plate; a first through hole and a second through hole are formed in the generating body bottom plate, and a first communicating hole communicated with the first through hole and a second communicating hole communicated with the second through hole are formed in the base. The generating body is arranged in the pipe body, vortexes can be generated when fluid passes through the generating body in the pipe body, the distance between the vortexes corresponds to the specific volume of the fluid, the number of the vortexes can be measured through the sensor, and the volume flow is obtained after conversion; the generating body is arranged to be in a T shape, the lift coefficient of the generating body reaches 10 times of the resistance coefficient, vortexes generated by the generating body are stronger than those generated by an existing generating body, and in a wide Reynolds number range, vortex street signals are high in stability and good in linearity.

The invention discloses a method for checking and judging meter steam flow through fuel quantity disturbance and a related product, and belongs to the technical field of thermal equipment performance state diagnosis. According to the method for checking and judging the meter steam flow through the fuel quantity disturbance, the function relation between the actual steam specific volume and the steam pressure and the function relation between the actual steam specific volume and the steam temperature are established, a parameter change characteristic derivation formula under the steady-state working condition after the fuel quantity disturbance is combined, and the influence of multi-parameter coupling fluctuation caused by the fuel quantity disturbance on the steam flow is fully considered; calculation deviation caused by the fact that parameters are difficult to accurately obtain in actual production is avoided, a more accurate meter steam flow variation calculation result can be provided, and reliable data support is provided for unit operation. Meanwhile, a large number of accurate equipment parameters and operation data do not need to be obtained, the calculation process is simplified, the meter steam flow checking result can be provided for operation personnel in time, the operation personnel can make adjustment conveniently and rapidly, and stable operation of a unit is guaranteed.

The invention relates to a profile control agent for a high-salinity-resistant deep oil reservoir and a preparation method of the profile control agent, and belongs to the technical field of oil exploitation. The profile control agent is composed of a pretreatment slug, a front slug I, an oil displacement slug II and a reinforced slug III according to a specific volume ratio, each slug adopts adaptive raw materials such as solid particles with composite particle sizes and a composite protective agent, and functional synergy is realized by optimizing a formula and a preparation process. The plugging agent can tolerate the degree of mineralization below 300000mg / L and the temperature of 40-120 DEG C, can realize deep accurate plugging and efficient oil displacement of an oil reservoir, and remarkably improves the plugging rate and the scouring-resistant stability. The profile control agent has the advantages of easily available raw materials, simple preparation and strong construction adaptability, and can effectively improve the oil reservoir development effect in the extreme environment and increase the recovery rate of remaining oil.

The invention discloses a boiler high-temperature heating surface heat absorption non-uniform coefficient calculation method based on monitoring data, relates to the field of heat absorption non-uniform coefficient calculation, and solves the problem that the boiler high-temperature heating surface heat absorption non-uniform coefficient cannot be accurately calculated. According to real-time monitoring data, steam parameters at inlets and outlets of the same tube rings in different tube panels are calculated, and mass flow rates of steam at inlets of distribution headers and outlets of collection headers on the heating surfaces are calculated; according to the steam enthalpy value and the steam specific volume at the inlet and the outlet, the enthalpy increase, the enthalpy increase deviation and the average specific volume of the steam in the same pipe ring in different pipe panels are calculated, the static pressure difference at the inlet and the outlet of the same pipe ring in different pipe panels is calculated, and the steam flow deviation in the same pipe ring in different pipe panels is calculated; and according to the steam flow deviation and the steam enthalpy increase deviation, the heat absorption non-uniform coefficient of the same tube coil in different tube panels is calculated. According to the method, accurate calculation of the heat absorption non-uniform coefficient of the high-temperature heating surface of the boiler is achieved.

This invention relates to a compressor intake silencing device, belonging to the technical field of compressor silencing accessories. It includes: a silencing box for housing the compressor, the silencing box having independently distributed airflow buffer chambers and resonance silencing chambers internally, and an intake channel connecting the airflow buffer chambers and resonance silencing chambers; the compressor is placed inside the resonance silencing chamber; the side wall of the silencing box corresponding to the airflow buffer chamber has multiple intake holes arranged in a honeycomb pattern at intervals, and the top of the silencing box corresponding to the resonance silencing chamber has an outlet hole. This invention utilizes the honeycomb-shaped small-diameter intake holes to enhance the throttling pressure drop effect, thereby increasing the intake air velocity and reducing the gas specific volume, thus improving the compressor's unit volume cooling capacity; simultaneously, the front and rear separation of the airflow buffer chamber and the resonance silencing chamber effectively buffers high-speed pulsating airflow and suppresses turbulence and regenerated noise, achieving the dual benefits of rapid intake and efficient silencing.

The invention provides a grain and oil production process control method, which comprises the following steps: acquiring the temperature, depth, specific volume and flow of oil in each storage tank in real time, releasing pressure if the specific volume exceeds the upper limit, and supplementing pressure and outputting oil at constant pressure if the specific volume is lower than the lower limit; if the oil depth is insufficient, the oil is supplemented to the normal depth, and automatic steady-state control over the oil product in the storage tank is achieved. Automatic and refined management of the oil state in the grain and oil production process can be achieved, the production efficiency and the product quality are improved, and the safety and stability of the production process are enhanced.

The application discloses a device and a use method for assisting droplet generation, wherein one way of the output end of a gas storage unit is connected to a pressure applying device, and the other way is connected to external atmosphere, gas is delivered into a droplet generation unit through the pressure applying device, and an airtight connection can be formed between the pressure applying device and the droplet generation unit, pressure construction and droplet preparation process can realize full-process automation, in the process of use, firstly, the gas pressure of the gas storage unit is increased to a preset value greater than a target value, then the pressure increasing of the gas storage unit is stopped, then the gas storage unit is gradually exhausted to the atmosphere through control, so that the gas pressure in the gas storage unit gradually decreases, the influence of the rapid flow of gas on the accuracy of real-time gas pressure detection in the pressure feedback control process can be effectively avoided, the accuracy and stability of providing the positive pressure of the target value of the gas pressure to the droplet generation unit are improved, and the reliability of the droplet generation unit in completing the droplet preparation of a specific volume of dispersed phase reagent at a specific time under a specific pressure is ensured.

The utility model relates to a pulsating differential pressure flowmeter, which belongs to the technical field of flow measuring devices, and comprises a base and a pipe body detachably connected with the base, a generating body is arranged in the pipe body, the generating body comprises a generating body bottom plate and a generating body main body arranged on the generating body bottom plate, and the generating body main body is arranged on the generating body bottom plate. A first through hole and a second through hole are formed in the generating body bottom plate, and a first communicating hole communicated with the first through hole and a second communicating hole communicated with the second through hole are formed in the base. The generating body is arranged in the pipe body, vortexes can be generated when fluid passes through the generating body in the pipe body, the distance between the vortexes corresponds to the specific volume of the fluid, the number of the vortexes can be measured through the sensor, and the volume flow is obtained after conversion; the generating body is arranged to be in a T shape, the lift coefficient of the generating body reaches 10 times of the resistance coefficient, vortexes generated by the generating body are stronger than those generated by an existing generating body, and in a wide Reynolds number range, vortex street signals are high in stability and good in linearity.

The utility model provides an adjustable quantitative liquid adding container and a grinding liquid mixing device, and belongs to the technical field of quantitative adding. The container comprises a constant volume container body and an overflow pipe. The constant volume container body is used for measuring first liquid of a specific volume. The constant volume device body comprises a first liquid adding opening used for adding first liquid into the constant volume device body and a first liquid discharging opening used for discharging the first liquid. The first liquid adding device is connected with the first liquid adding opening, an opening and closing valve is arranged at the first liquid discharging opening, and a mounting hole is formed in the constant volume device body. One end of the overflow pipe extends into the constant volume container main body through the mounting hole, the other end of the overflow pipe is exposed outside the constant volume container main body, the length of the overflow pipe extending into the constant volume container main body is adjustable, and first liquid higher than the top of the overflow pipe in the constant volume container main body can be completely discharged through the overflow pipe. The adjustable quantitative liquid adding container disclosed by the utility model can ensure that a solution can be accurately measured, and excessive liquid adding is avoided.

The present invention discloses a liquid distributor and a compressor, wherein the liquid distributor comprises a cylinder and an elastic tube, wherein an expansion and contraction cavity is formed in the elastic tube, and the expansion and contraction cavity and the cylinder inner cavity are interconnected, so that when the pressure in the cylinder changes, the elastic tube undergoes elastic deformation along with the pressure in the cylinder to adjust the volume of the expansion and contraction cavity. The liquid distributor of the present invention automatically adjusts the gas specific volume of the compressor through the elastic tube, maintains a stable refrigerant flow rate delivered by the compressor, ensures a constant pressure ratio of the compressor, and thereby maintains a stable volumetric efficiency of the compressor.

The invention discloses a method for designing the mix proportion of machine-made sand concrete with fluctuation of the content of specific volume-weight stone powder for an immersed tunnel, which comprises the following steps of: determining the use amount of a cementing material according to the preparation strength of the concrete, calculating the water-binder ratio according to a water-binder ratio formula considering the fluidity, and solving the water consumption; according to the initial sand ratio, simultaneous solving is conducted based on a mass method, and the initial raw material dosage is obtained; adjusting the use amount of the cementing material, the water consumption and the sand ratio according to different contents of the machine-made sand powder to obtain the adjusted use amount of the raw material, and determining the use amount of the water reducing agent and the final water consumption on the basis of the adjusted use amount of the raw material; determining the type and the mixing amount range of the air entraining agent by combining the adaptability of the water reducing agent and the air entraining agent; and determining the relative volume based on the adjusted raw material dosage, calculating the gas content required by the concrete according to a volumetric method, and determining the mixing amount of the air entraining agent on the basis to obtain the final concrete mix proportion. According to the design method, the working performance, the mechanical performance and the volume weight of the immersed tube concrete with the mix proportion all meet the requirements of immersed tube tunnel engineering.

The invention relates to the technical field of vacuumizing, in particular to a pipeline fractional condensation and vacuum pump collaborative vacuumizing system and method. The system sprays steam from the bottom of the container through the superheated steam spraying device, and laminar flow is formed through a honeycomb hole array to replace rapid exhaust gas. Mixed gas enters a three-stage atomization condensation section through a pipeline, the water spraying amount and the time sequence are dynamically adjusted through a PI D controller according to the real-time vacuum degree, stage-by-stage condensation is conducted through inclined spraying, condensate water is separated from a hydrophobic membrane through a V-shaped groove, residual gas is pumped away through a vacuum pump, and the final vacuum degree lt is obtained; 100 Pa or lt; 50 Pa and the like. The method has the advantages that 1) steam replacement is combined with fractional condensation to break through the air specific volume limit, and the pumping speed is increased by 50%; 2) the load of the vacuum pump is reduced by PI D accurate control, and the energy consumption is reduced by 30%; and 3) the anti-backflow design and dynamic spraying ensure the stability and meet the requirements of different containers.

The invention provides a method for analyzing the impurity content of liquid carbon dioxide in a pressure storage tank, which comprises the following steps of: before taking a specific volume of liquid carbon dioxide from the bottom of the pressure storage tank, determining the gas phase mole fraction and thermodynamic parameters of each component in the pressure storage tank before taking the liquid; calculating a gas-liquid equilibrium constant, a mole number and a mole fraction of each component in the pressure storage tank before liquid taking; calculating the liquid phase mole fraction of each component in the pressure storage tank before liquid taking; after liquid carbon dioxide with a specific volume is taken out from the bottom of the pressure storage tank, the mole fraction of each component in the pressure storage tank after liquid taking is calculated; and determining the impurity content of the liquid carbon dioxide in the pressure storage tank after the specific volume of liquid carbon dioxide is taken out. Dynamic analysis of the content of the liquid carbon dioxide impurities in the pressure storage tank is realized, the problems of high difficulty and low precision in measurement of the composition of the liquid carbon dioxide impurities in the pressure storage tank are solved, and a basis is provided for subsequent research on a carbon dioxide pipeline transportation technology.

This invention discloses a method for calculating the heat absorption non-uniformity coefficient of a boiler's high-temperature heating surface based on monitoring data. It relates to the field of heat absorption non-uniformity coefficient calculation and solves the problem of inaccurate calculation of the heat absorption non-uniformity coefficient of a boiler's high-temperature heating surface. The method includes acquiring real-time monitoring data of the boiler, calculating steam parameters at the inlet and outlet of the same tube coil in different tube panels based on the real-time monitoring data, calculating the mass flow rate of steam at the inlet of the distribution header and the outlet of the collection header, calculating the enthalpy increase, enthalpy increase deviation, and average specific volume of steam in the same tube coil in different tube panels based on the steam enthalpy and specific volume at the inlet and outlet, calculating the static pressure difference at the inlet and outlet of the same tube coil in different tube panels, calculating the steam flow rate deviation in the same tube coil in different tube panels, and calculating the heat absorption non-uniformity coefficient of the same tube coil in different tube panels based on the steam flow rate deviation and the steam enthalpy increase deviation. This invention achieves accurate calculation of the heat absorption non-uniformity coefficient of a boiler's high-temperature heating surface.