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Equivalent enthalpy drop determination method for two-path mixed feeding low-pressure coal economizer

A low-pressure economizer and a technology to determine the method, which is applied in the direction of feed water heater, preheating, steam generation, etc., can solve the problem of inability to accurately and effectively confirm the thermal efficiency of the low-pressure economizer after the two-way mixing, and the inability to evaluate the optimal operation of the economical power plant And other issues

Inactive Publication Date: 2011-04-27
SHANDONG ELECTRIC POWER RES INST +1
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Problems solved by technology

Existing books related to equivalent enthalpy drop only introduce the analysis and calculation methods for the one-way inlet low-pressure economizer, but do not involve the system analysis and calculation method for the design of two-way mixing and backward low-pressure economizers, so it is impossible to accurately and effectively confirm the two The thermal efficiency of the low-pressure economizer after road mixing, so it is impossible to evaluate its economy and guide the optimal operation of the power plant

Method used

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  • Equivalent enthalpy drop determination method for two-path mixed feeding low-pressure coal economizer
  • Equivalent enthalpy drop determination method for two-path mixed feeding low-pressure coal economizer
  • Equivalent enthalpy drop determination method for two-path mixed feeding low-pressure coal economizer

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] figure 1 The system diagram of the present invention is given, it connects the same low pressure economizer 1 at the outlet of #7 low plus 4 and the outlet of #8 low plus 5, and then the outlet of low pressure economizer is connected with the outlet of #5 low plus 2 After connecting, connect with deaerator 6 again.

[0048] Method of the present invention is:

[0049] 1. The #7 low-gas outlet is connected to the low-pressure economizer and connected to the #5 low-gas outlet, such as figure 2 Shown:

[0050] δη 1 =(α d1 *((h d -h 5 )*η 4 +τ 6 *η 6 +τ 5 *η 5 ) / H)*100%

[0051] δη 1 ----- Relative increase percentage of unit thermal efficiency

[0052] alpha d 1 ------ #7 Low feed low pressure economizer flow relative to main steam flow share

[0053] h d -------- Economizer outlet water enthalpy

[0054] h 5 --------#5 Low plu...

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Abstract

The invention relates to an equivalent enthalpy drop determination method for a two-path mixed feeding low-pressure coal economizer. The method is simple and has small operating amount. The method comprises the following steps of: calculating fractional flow of each path according to a thermal balance method; partitioning an entire system into two paths according to different low pressure heatersconnected with the inlet of the low-pressure coal economizer; calculating the benefits delta eta 1 and delta eta 2 of the two paths of low-pressure coal economizers respectively; adding the benefits delta eta 1 and delta eta 2 together so as to obtain total benefit delta eta=delta eta 1+delta eta 2 of the low-pressure coal economizer.

Description

technical field [0001] The invention relates to a method for determining the equivalent enthalpy drop of a two-way mixed-inlet low-pressure economizer. Background technique [0002] The low-pressure economizer of Unit #5 of Centennial Electric Power Development Co., Ltd. was designed and installed by Shandong Huate Company. After heating, go to the #5 low-load outlet, so that the waste heat of the flue gas can be used to improve the thermal efficiency of the unit. Existing books related to equivalent enthalpy drop only introduce the analysis and calculation methods for the one-way inlet low-pressure economizer, but do not involve the system analysis and calculation method for the design of two-way mixing and backward low-pressure economizers, so it is impossible to accurately and effectively confirm the two The thermal efficiency of the low-pressure economizer after road mixing cannot evaluate its economy and guide the optimal operation of the power plant. Contents of the...

Claims

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Application Information

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IPC IPC(8): F22D1/32
Inventor 董洋
Owner SHANDONG ELECTRIC POWER RES INST
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