Heating working condition thermal performance calculation method of extraction steam heating unit

Abstract

The invention discloses a heating working condition thermal performance calculation method of an extraction steam heating unit. The method solves the problem that an existing calculation method has certain limitations in applicable objects and working conditions. The number of regulation stages of a high-pressure cylinder of the extraction steam heating unit is defined to be eight, a heat consumption guarantee working condition (THA) heat balance diagram of the extraction steam heating unit is obtained, and the state of steam on the intersection position of the first stage and the first stage is determined; the state of steam on the intersection position of the first stage and the second stage is determined, and the state of steam on the intersection position of the third stage and the fourth stage and the state of steam on the intersection position of the fourth stage and the fifth stage are obtained; after steam-water flow distribution and stage of a whole machine are obtained, and the given main steam amount, heating extraction steam amount, steam-water loss rate, steam exhaust pressure, pollutant discharge rate, heat supply network heater drainage amount and thermal performance of a temperature lower unit can be calculated. By building a universal mathematic model, thermal performance of the unit under different heating working conditions can be calculated, and universality is high.

Description

technical field [0001] The invention relates to a method for calculating the thermodynamic performance of a steam extraction heating unit in the heating condition. Background technique [0002] The methods currently used to study the thermal performance of heating units in heating conditions mainly include the analysis method of the working diagram and the thermal test method of the steam turbine. The working condition diagram of a heating steam turbine is a curve showing the relationship between the main steam flow rate of the steam turbine, heating extraction steam volume and power. It consists of a series of extraction steam flow working condition lines, maximum main steam flow The exhaust flow operating condition line and the minimum power limiting operating condition line are jointly composed, provided by the steam turbine manufacturer, and calculated according to the design parameters. The operating diagram analysis method is generally only applicable to specific unit...

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Problems solved by technology

The thermal test method has a large workload, and generally does not consider the influence of the loss of steam and water in the whole plant, sewage discharge, etc. on the thermal per

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