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Estimation method for working medium charge volume of organic rankine cycle system

A circulating system and circulating working fluid technology, applied in special data processing applications, instruments, electrical and digital data processing, etc. Effect

Active Publication Date: 2018-11-06
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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  • Estimation method for working medium charge volume of organic rankine cycle system
  • Estimation method for working medium charge volume of organic rankine cycle system
  • Estimation method for working medium charge volume of 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 an estimation method for a working medium charge volume of an organic rankine cycle (ORC) system. The method is used for acquiring a minimum working medium charge volume of the organic rankine cycle system. The method comprises the following steps of (1) constructing a dynamic characteristic model of an ORC system based on a component transfer function of the organic rankine cycle system; (2) calculating a flow rate of a mass injected from a liquid storage device into the ORC and a flow rate of a mass discharging from the ORC into the liquid storage device; (3) takinga difference between the flow rate of the mass injected from the liquid storage device into the ORC and the flow rate of the mass discharging from the ORC into the liquid storage device as a net flowrate of working medium exchange between the ORC and the liquid storage device, and calculating a maximum cycle working medium variable quantity of the ORC; and (4) calculating a maximum working mediumrequirement of the ORC, that is, the minimum working medium charge volume, according to a minimum running working medium quantity and the maximum cycle working medium variable quantity of the ORC. Compared with the prior art, the estimation method for the working medium charge volume of the organic rankine cycle system has the advantages that the difficulty for solving of working medium distribution is avoided, the calculation is simple and accurate, the adaptability is strong and the flexibility is excellent.

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 Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 靳允立高乃平朱彤
Owner TONGJI UNIV
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