Thermodynamic system for improving heat supply unit electric output adjusting capacity

A technology for regulating capacity and heating units, applied in mechanical equipment, steam engine devices, machines/engines, etc., can solve problems such as inability to guarantee the normal operation of SCR denitrification devices, ignoring the temperature of feed water, and insufficient peak shaving capabilities

CN108625911AActive Publication Date: 2018-10-09NORTHEAST DIANLI UNIVERSITY +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-10-09

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Abstract

The invention relates to a thermodynamic system for improving heat supply unit electric output adjusting capacity. The thermodynamic system is characterized in that main steam or reheating section steam is subject to temperature and pressure reduction to directly serve as heat source steam for industrial heat users; an absorption heat pump 23 of a first-stage heat exchange device serves as a heatsource of a first-stage heat exchange station 25 in the heating period to supply heat to heat users 29 and supplies cold to the users in the non-heat supply period; a high-pressure electric boiler 24of a second-stage heat exchange device improves the boiler water feeding temperature, reduces heat absorbed by boiler fed water in an economizer 4, accordingly improves the boiler tail smoke discharging temperature, and guarantees normal running of an SCR denitration device 5; and according to a three-stage heat exchange device, exhaust steam of a turbine intermediate pressure cylinder 8 serves asheat source steam of a third-stage heat exchange station 27, the unit heat load is guaranteed, and the heat using requirement of the heat users 29 is met. The electric output adjusting capacity of the heat supply unit can be improved, it is guaranteed that the unit heat supply capacity is not decreased under the low load running working conditions, pyroelectric decoupling is achieved, and the electric output adjusting capacity of the heat supply unit is improved.
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Description

technical field

[0001] The invention relates to the technical field of cogeneration and heat supply of coal-fired power units, and relates to a thermodynamic system for improving the power output adjustment capability of a heating unit. Background technique

[0002] With the rapid development of society and economy, the consumption of energy continues to increase, and the energy transformation of replacing traditional energy with new energy has attracted worldwide attention. With its outstanding technical and economic advantages, wind energy has gradually become the mainstream of new energy power generation. The development of wind power installed capacity has also brought adverse effects. The difficulty of wind power grid connection and consumption, and the increasing amount of abandoned wind have gradually become prominent, which has become a major challenge restricting the healthy development of wind power in China. Due to the distribution characteristics of my country's ...

Examples

Embodiment Construction

[0042] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] see Figure 4 , this embodiment is used for thermoelectric decoupling transformation of a 330MW steam turbine in a certain power plant. kPa, heating extraction pressure 0.687MPa, steam turbine is subcritical, one-time intermediate reheat, two-cylinder two-exhaust, single-shaft, extraction and condensing turbine.

[0044] This embodiment is a thermal system for improving the power output adjustment capability of heating units, including a steam drum 1, a superheater 2, a reheater 3, an economizer 4, an SCR denitrification device 5, an air preheater 6 and a main steam device , also includes an industrial steam device, a primary heat exchange device, a secondary heat exchange device, a tertiary heat exchange device and a heat network circulation pipeline, the inlet of the industrial steam device is connected to the superheater 2, th...