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Evaluation method for condenser numerical simulation on the basis of Star-CD

An evaluation method and numerical simulation technology, applied in the field of steam turbines, can solve problems such as mutual constraints, and achieve moderate operability

Inactive Publication Date: 2018-09-28
HARBIN TURBINE AUX EQUIP ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention solves the problem that the rationality of existing condenser tube bundle design is mainly manifested in parameters such as smooth flow of steam mixture, air accumulation position, steam condensation amount, mixture pressure drop, etc. These parameters influence each other and restrict each other, and further propose An Evaluation Method of Condenser Numerical Simulation Based on Star-CD

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  • Evaluation method for condenser numerical simulation on the basis of Star-CD
  • Evaluation method for condenser numerical simulation on the basis of Star-CD
  • Evaluation method for condenser numerical simulation on the basis of Star-CD

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specific Embodiment approach 1

[0013] Specific implementation mode one: combine figure 1 Describe this embodiment, the evaluation method of numerical simulation of a kind of condenser based on Star-CD described in this embodiment is realized through the following steps:

[0014] Step 1. Calculate the mixed gas flow velocity v and turbulence intensity I at the inlet of the condenser according to the exhaust flow of the low-pressure cylinder of the steam turbine unit;

[0015] Step 2. Calculate the flow velocity v of the cooling water in each heat exchange tube according to the flow and pressure of the cooling water in the condensing system c ;

[0016] Step 3. Set the condenser outlet pressure value, and subtract the loss pressure from the condenser exhaust pressure to obtain the condenser outlet pressure value;

[0017] Step 4, calculate the condenser steam condensation amount and the steam non-condensation amount according to the parameters in step 1, step 2, and step 3; the non-condensation amount is th...

specific Embodiment approach 2

[0019] Specific implementation mode two: combination figure 1 To illustrate this embodiment, the formula for calculating the mixed gas flow velocity v in Step 1 of a Star-CD-based condenser numerical simulation evaluation method described in this embodiment is:

[0020]

[0021] In the formula (1), v represents the flow rate of the mixed gas at the entrance of the condenser, G represents the flow rate of the mixed gas at the entrance of the condenser, ρ represents the density of the mixed gas at the entrance of the condenser, and S represents the cross-sectional area at the entrance of the condenser;

[0022] The calculation formula of turbulence intensity I is:

[0023] I=0.16(Re×D H ) -0.125 (2)

[0024] In formula (2), I represents the turbulence intensity at the condenser inlet, Re represents the Reynolds number, and DH represents the turbulent length of the working fluid.

specific Embodiment approach 3

[0025] Specific implementation mode three: combination figure 1 Describe this embodiment, the flow velocity v of the cooling water in each heat exchange tube in Step 2 of the Star-CD-based condenser numerical simulation evaluation method described in this embodiment c The calculation formula is:

[0026]

[0027] v in formula (3) c Indicates the cooling water flow rate in the heat exchange tube, G c Indicates the cooling water flow in the condensing system, ρ c Indicates the cooling water density, S c Indicates the cross-sectional area of ​​heat exchange tubes, and N indicates the number of heat exchange tubes.

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Abstract

The invention discloses an evaluation method for condenser numerical simulation on the basis of Star-CD, and relates to an evaluation method, in particular to the evaluation method for the condenser numerical simulation on the basis of the Star-CD. The evaluation method aims to solve the problems that the discrimination of the design rationality of a condenser tube bundle at present is mainly embodied on the aspects of parameters including steam mixture flowing smoothness, air gathering positions, steam condensation amounts, mixture pressure drop and the like, and the parameters are mutually influenced and restricted. The evaluation method comprises the following steps that: according to the exhaust flow of a turbine unit low-pressure cylinder, calculating mixed gas flow velocity v and turbulence intensity I on a condenser inlet; according to cooling water flow and pressure in a condensing system, calculating the flow velocity vc of cooling water in each heat exchange tube; setting thepressure value of a condenser outlet; according to parameters in S1, S2 and S3, calculating a condenser steam condensing amount and a condenser steam noncondensing amount; when the noncondensing amount conforms to a standard, finishing calculation; and otherwise, returning to S3 to carry out recalculation. The evaluation method belongs to the field of steam turbines.

Description

technical field [0001] The invention relates to an evaluation method, in particular to an evaluation method for numerical simulation of a condenser based on Star-CD, and belongs to the field of steam turbines. Background technique [0002] The condenser is an important auxiliary equipment of the turbogenerator, and the design of the tube bundle is the core work of the design of the whole condenser. There are two kinds of methods for judging the design performance of the condenser tube bundle: test method and numerical simulation calculation. The test method is intuitive and accurate, but it is expensive and time-consuming; the numerical calculation method makes many assumptions, but through the accumulation of time and experience, the numerical simulation method has been developed very maturely, and the numerical simulation method is low in cost and fast. Therefore, the method of tube bundle numerical simulation has become an important means to judge whether the tube bundle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 付元钢张晓燕许宝军
Owner HARBIN TURBINE AUX EQUIP ENG
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