Steam waste energy utilization coupling extraction heat supply system and adjusting method for power peak regulation of coal-fired thermoelectric unit

Abstract

The invention discloses a steam waste energy utilization coupling extraction heat supply system and adjusting method for power peak regulation of a coal-fired thermoelectric unit, and belongs to the technical field of heat and power generation. The system comprises a steam turbine high-pressure cylinder, a reheater, a turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a steamgenerator, a pressure matcher, a deaerator, a second water supply pump and an industrial hot user; the steam generator is used for heating low-temperature water supply from the deaerator to produce high-pressure steam by using heat re-steam from the reheater as a heat source, the high-pressure steam source serves as a high-pressure steam source of the pressure matcher, and the industrial steam from the pressure cylinder in the steam turbine is driven to produce steam needed by industrial hot users. According to the steam waste energy utilization coupling extraction heat supply system, the pressure matcher and the steam generator are coupled with an original industrial steam extraction mode, so that the coal-fired thermoelectric unit can effectively meet the external steam supply requirement when the coal-fired thermoelectric unit operates at high and low loads, and an electric power adjusting peak of the coal-fired thermoelectric unit is realized. Therefore, the steam waste energy utilization coupling extraction heat supply system has a large practical application value.

Description

technical field [0001] The invention belongs to the technical field of cogeneration of heat and power, and in particular relates to a steam residual energy utilization coupling steam extraction heating supply system and an adjustment method for power peak regulation of a coal-fired thermal power unit. Background technique [0002] At present, for thermal power plants that have realized industrial extraction and central heating in the early stage, due to the simple and extensive heating technology and serious energy loss, the comprehensive energy utilization efficiency of thermal power plants cannot be further improved, and many thermal power plants that have already provided industrial heating have not achieved profitability. There may even be losses. The main reason for this phenomenon is that the heat supply design of the unit is designed according to the working conditions, but in actual operation, the load of the unit fluctuates frequently, especially when the unit is in...

AI Technical Summary

Problems solved by technology

[0002] At present, for thermal power plants that have realized industrial extraction and central heating in the early stage, due to the simple and extensive heating technology and serious energy loss, the comprehensive energy utilization efficiency of thermal power plants cannot be further improved, and many thermal power plants that have already provided industrial heating have not achieved profitability. even a loss

The main reason for this phenomenon is that the heat supply design of the unit is designed according to the working conditions, but in actual operation, the load of the unit fluctuates frequently, especially when the unit is in low-load operation, in order to meet the steam parameters required by industrial heating, usually The energy loss caused by throttling and other methods is very serious, resulting in the failure of the thermal power unit to achieve profitability

[0003] At present, the main patented technologies in this field: (1) medium and low pressure Unicom butterfly valve adjustment combined with hot press medium and low pressure industrial steam supply method and system "Patent No. 201610320911.1" and (2) new heat and power cogeneration steam turbine "Patent No. 200810013170.8", there are The following technical limitations, first, the degree of superheat of the high-parameter steam has not been fully utilized, and second, the temperature parameters of the high and low pressure steam of the hot press or pressure matcher cannot be adjusted, and the efficiency of the hot press or pressure matcher cannot be improved

Therefore, the two patented technologies have certain limitations in improving energy efficiency.

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