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Method for simulating DSG (Direct Steam Generation) trough heat collector by using nonlinear distributed parameter model

A technology of distributed parameter model and trough heat collector, which is applied in the fields of instruments, electrical digital data processing, special data processing applications, etc., can solve problems affecting the accuracy of dynamic characteristics and achieve good output performance

Inactive Publication Date: 2013-11-13
HOHAI UNIV
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Problems solved by technology

Ray established a nonlinear lumped parameter model of the DSG collector and studied its dynamic characteristics, but the working medium was assumed to be an incompressible fluid, which affected the accuracy of its dynamic characteristics

Method used

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  • Method for simulating DSG (Direct Steam Generation) trough heat collector by using nonlinear distributed parameter model
  • Method for simulating DSG (Direct Steam Generation) trough heat collector by using nonlinear distributed parameter model
  • Method for simulating DSG (Direct Steam Generation) trough heat collector by using nonlinear distributed parameter model

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0026] The solar radiation energy is reflected by the concentrator, acts on the surface of the metal tube wall through the glass seal tube and vacuum area of ​​the heat-absorbing tube, and is transmitted inward through the metal tube wall; the working medium (water, water vapor or two-phase flow ) enters from the inlet of the heat-absorbing tube and undergoes convective heat exchange with the tube wall, and its thermodynamic parameters are constantly changing. Its simplified physical model Figure 5 shown. F is the cross-sectional area of ​​the tube; T is the temperature of the working medium; H is the specific enthalpy of the working medium; D is the mass flow rate of the working medium; P is the pressure of the working medium; ω is the flow rate of the working medium; ρ is the density of the working medium; Q 1 , Q 2 are the heat release per unit time, unit tu...

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Abstract

The invention discloses a method for simulating a DSG (Direct Steam Generation) trough heat collector by using a nonlinear distributed parameter model and belongs to the technical field of solar energy heat utilization. The method comprises the following steps of establishing and discretizing the nonlinear distributed parameter model of the DSG trough heat collector; solving other physical property parameters of a working medium by using the pressure and the specific enthalphy of the working medium at each time and each position of the DSG trough heat collector; and disturbing the direct solar radiation intensity, the inlet working medium temperature and the inlet working medium quality flow of a DSG trough heat collector control model to test the response of outlet parameters of the DSG trough heat collector. According to the method disclosed by the invention, the established nonlinear distributed parameter dynamic model of the DSG trough solar heat collector considering the space distribution influence of the heat collector embodies a good output performance for outside disturbances such as the solar radiation intensity, the feedwater flow and the temperature.

Description

technical field [0001] The invention discloses a method for simulating a DSG trough heat collector by using a nonlinear distribution parameter model, and belongs to the technical field of solar heat utilization. Background technique [0002] Direct steam generation (DirectSteamGeneration, DSG) trough solar thermal power generation system (trough system) uses a parabolic trough concentrator to focus sunlight on the heat-absorbing tube, and directly heats the working medium water in the heat-absorbing tube until it produces A system in which steam drives a turbogenerator to generate electricity. Among them, the device composed of a concentrator and a heat-absorbing tube is called a DSG trough solar collector (DSG collector), and the heat-absorbing tube is composed of a glass-sealed tube, a metal tube, and a vacuum area between the two. Generally, there are three operating modes of DSG trough systems: straight-through, injection and circulation, among which the circulation mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 郭苏刘德有许昌王沛陈永记
Owner HOHAI UNIV
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