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A Novel System and Method for Utilizing Pressure Difference of High-pressure Extraction Steam of Thermal Power Unit

A technology of thermoelectric units and heating units, applied in heating systems, steam central heating systems, heating methods, etc., can solve the problems of fuel consumption economy, loss, and throttling loss, and achieve the improvement of total energy efficiency, The effect of high power generation output and reduced throttling loss

Active Publication Date: 2022-03-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of excessive throttling loss of the heating steam of the cogeneration unit under the conventional temperature reduction and decompression method, resulting in fuel consumption and economic loss, and proposes a new type of high-pressure steam extraction pressure difference utilization system and methods

Method used

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  • A Novel System and Method for Utilizing Pressure Difference of High-pressure Extraction Steam of Thermal Power Unit
  • A Novel System and Method for Utilizing Pressure Difference of High-pressure Extraction Steam of Thermal Power Unit
  • A Novel System and Method for Utilizing Pressure Difference of High-pressure Extraction Steam of Thermal Power Unit

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Embodiment 1

[0064] This embodiment is a new type of high-pressure extraction steam pressure difference utilization system applied to a 300MW heat and power cogeneration unit. The production capacity of the combined heat and power unit is gas-steam combined cycle heat and power cogeneration (the rated load of the gas turbine is 200MW, and the rated load of the steam turbine is 100MW). The extraction parameters are: high pressure extraction 400°C / 3.38MPa; medium pressure extraction 500°C / 2.2MPa; low pressure extraction 390°C / 0.96MPa. The heating steam parameter provided by this unit is 330℃ / 2MPa, and the rated steam supply is 55t / h.

[0065] The steam supply system applied in this embodiment adopts such as figure 1 The arrangement shown includes: steam turbine a, compressor b, compressor exhaust heater d, turbine exhaust heater c, temperature compensator e, heating steam mixer f and steam pipeline.

[0066] In the above-mentioned high-pressure extraction steam pressure difference utilizat...

Embodiment 2

[0069] Based on the aforementioned high-pressure steam extraction pressure difference utilization system, the present invention proposes a new method of high-pressure steam extraction, temperature reduction and pressure reduction for heating units, and uses a 300MW heat and power cogeneration unit as an example to illustrate. as attached figure 2 shown, including the following steps:

[0070] Step S1. Calculate the high-pressure and low-pressure extraction steam flows based on the heating load of the heating network.

[0071] S11: as attached image 3 As shown, through the unit DCS system and sensors, the parameters of the unit's high-pressure extraction steam, low-pressure extraction steam, and heating steam temperature, pressure, and entropy are collected. Under the rated heating condition of the unit in this embodiment, the high-pressure steam extraction parameters of the unit are 400°C / 3.38MPa, the low-pressure steam extraction parameters are 390°C / 0.96MPa, and the requ...

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Abstract

The invention discloses a novel system and method for utilizing the pressure difference of the high-pressure steam extraction of the thermoelectric unit, which can utilize the pressure difference between the high-pressure steam extraction of the unit and the heating steam, so as to reduce the pressure difference of the high-pressure steam extraction during conventional temperature reduction and pressure reduction. Throttling losses incurred by the process. The system includes a steam turbine, compressor, compressor exhaust heater, turbine exhaust heater, heating steam mixer, temperature compensator and steam transmission piping. The inlet steam of the steam turbine comes from the high-pressure extraction steam of the thermoelectric unit, and the heat flow inlet steam of the compressor exhaust heater comes from the low-pressure extraction steam of the unit; the cold flow inlet and outlet of the turbine exhaust heater are respectively connected to the steam turbine and the heat supply The steam mixer, the heat flow inlet and outlet are connected to the compressor exhaust heater and the compressor; after the compressor exhaust steam is heated, it is mixed with the steam at the outlet of the turbine exhaust heater, and enters the first heating station as heating steam. The invention can effectively reduce the throttling loss, improve the heating energy efficiency, and can supply more steam to the heating network.

Description

technical field [0001] The invention relates to the technical field of steam extraction and heat supply for cogeneration units, in particular to a novel system and method for utilizing pressure difference of high-pressure extraction steam of thermal power units. Background technique [0002] At present, with the increasing scale of cities and towns, the heating demand of northern urban residents is in a state of rapid growth. According to statistics, the heating area of ​​northern cities and towns in 2015 is equivalent to 2.64 times that of 2001; at the same time, the expansion of industrial production , making the demand for industrial steam also show an upward trend. In this context, in order to meet the growing demand for heating and steam supply for civil and industrial purposes, many cogeneration units have been built across the country, and traditional thermal power generation units are also being transformed in the direction of heating. Combined heat and power genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K11/02F01K17/02F24D1/02F24D1/08F24D19/10
CPCF01K11/02F01K17/02F24D1/02F24D1/08F24D19/1003
Inventor 钟崴任庆胡亚才周懿林小杰
Owner ZHEJIANG UNIV