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A Estimation Method of Working Fluid Charge in Organic Rankine Cycle System

A technology of circulating system and circulating working fluid, which is applied in the direction of design optimization/simulation, special data processing application, etc., can solve problems such as the difficulty in solving the distribution of working fluid in the system, and achieve the effect of simple structure, simple and accurate calculation, and better adaptability

Active Publication Date: 2022-02-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing research attempts to determine the working fluid charge by obtaining the working fluid distribution along the entire ORC system, but it is difficult to solve the system working fluid distribution

Method used

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  • A Estimation Method of Working Fluid Charge in Organic Rankine Cycle System
  • A Estimation Method of Working Fluid Charge in Organic Rankine Cycle System
  • A Estimation Method of Working Fluid Charge in Organic Rankine Cycle System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Example 1 When the heat source changes, the outlet temperature of the evaporator is controlled by adjusting the flow rate of the working fluid pump. ORC system adopts constant pressure operation, the pressure before the expander inlet valve is controlled by the valve opening, the control adopts PI controller, and the transfer function includes proportional gain K 7 and integration time T 5 , which can be expressed as:

[0093]

[0094] When the speed of the working medium pump changes with the heat source, the dynamic model of the working medium exchange flow between the ORC cycle and the liquid storage device expressed by the transfer function is as follows: image 3 shown.

[0095] based on image 3 The dynamic model of embodiment 1 ORC cycle is discharged into the liquid storage device working medium flow rate m cyc,out Response to working fluid pump speed n p The varying transfer function can be expressed as:

[0096]

[0097] Example 1 The liquid storag...

Embodiment 2

[0113] In Example 2, when the heat source changes, the outlet temperature of the evaporator is controlled by adjusting the flow through the inlet valve of the expander. The ORC system adopts constant pressure operation, the pressure before the inlet valve of the expander is controlled by the speed of the working fluid pump, the control adopts the PI controller, and the transfer function includes the proportional gain K 8 and integration time T 6 , which can be expressed as:

[0114]

[0115] When the opening of the inlet valve of the expander changes with the fluctuation of the heat source, the dynamic model of the flow rate of the working medium exchange between the ORC cycle and the liquid storage device expressed by the transfer function is as follows: Figure 7 shown. based on Figure 7 The dynamic model of the fluid storage device injected into the ORC cycle flow rate m cyc,in The transfer function in response to the change of the inlet valve opening of the expande...

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Abstract

The invention relates to a method for estimating the charging amount of working fluid in an organic Rankine cycle system, which is used to obtain the minimum charging amount of working fluid in the organic Rankine cycle system, comprising the following steps: 1) Components based on the organic Rankine cycle system The dynamic characteristic model of the ORC system is constructed by the transfer function; 2) Calculate the mass flow rate injected into the ORC cycle from the liquid storage device and the mass flow rate discharged from the ORC cycle into the liquid storage device; 3) The mass flow rate injected into the ORC cycle from the liquid storage device and The difference between the mass flow rate discharged from the ORC cycle into the liquid storage device is used as the net flow rate of the working medium exchange between the ORC cycle and the liquid storage device, and the maximum change in the ORC cycle working medium is calculated; 4) According to the minimum operating mass and the maximum operating mass of the ORC cycle Calculate the maximum working fluid requirement of the ORC cycle based on the change of circulating working fluid, that is, the minimum charging volume of working fluid. Compared with the prior art, the present invention has the advantages of avoiding the difficult problem of solving working medium distribution, simple and accurate calculation, strong adaptability and more flexibility.

Description

technical field [0001] The invention relates to the technical field of low-quality heat recovery and utilization, in particular to a method for estimating the charging amount of working fluid in an organic Rankine cycle system. Background technique [0002] In order to improve energy utilization efficiency and reduce pollutant emissions, the utilization of low-quality heat sources has received extensive attention. The Organic Rankine Cycle (ORC) has great advantages in the utilization of low-quality heat energy, and has been successfully applied to recover low-quality heat sources such as industrial waste heat, geothermal energy, solar energy, and biomass energy. Since the ORC system uses organic working fluid as the working medium, it must be operated in a sealed manner. This makes the ORC system unable to charge the working fluid online like the Rankine cycle. Therefore, the working fluid charge of the ORC system needs to meet the maximum working fluid demand of the syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 靳允立高乃平朱彤
Owner TONGJI UNIV
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