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Low-load feed-water heating system of thermal power generating unit

A technology of feed water heating and thermal power units, applied in feed water heaters, lighting and heating equipment, preheating, etc., can solve problems such as boiler feed water temperature drop, achieve the effects of reducing coal consumption, increasing feed water temperature, and improving thermal efficiency

Active Publication Date: 2013-10-02
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a low-load feedwater heating system for thermal power units that can effectively solve the problem of boiler feedwater temperature drop under low-load operating conditions

Method used

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  • Low-load feed-water heating system of thermal power generating unit

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0013] see figure 1 , the present invention includes a jet heat pump 3 and a steam turbine 12 connected with the main steam pipeline 1, a steam valve 2 is installed on the pipeline between the main steam pipeline 1 and the jet heat pump 3, and the steam turbine 12 has the highest pressure regenerative steam extraction One path led out from the regenerative steam extraction pipe 4 is connected with the high-pressure heater 10, and the other path is connected with the injection heat pump 3 after being injected with the steam valve 5, and the outlet of the injection type heat pump 3 is connected with the mixed steam valve 6 and The steam side of the low-load feedwater heater 7 is connected, the low-load feedwater heater 7 heats the boiler feedwater, the water inlet side of the low-load feedwater heater 7 is connected with the feedwater side of the high-pressure ...

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Abstract

A low-load feed-water heating system of a thermal power generating unit comprises a jet heat pump and a steam turbine which are communicated with a main steam pipeline, wherein a steam valve is mounted on a pipeline between the main steam pipeline and the jet heat pump; regenerative extraction steam of the steam turbine is led out by a regenerative extraction steam pipe; one path is communicated with a high pressure heater; the other path is communicated with the jet heat pump after passing through an ejected steam valve; an outlet of the jet heat pump is communicated with a steam side of a low-load feed-water heater; a heating water inlet side of the low-load feed-water heater is communicated with a feed-water side of the high pressure heater; and a feed-water pipeline is communicated with a boiler after sequentially penetrating through the high pressure heater and the low-load feed-water heater. The system takes main steam as ejection steam; one-section regenerative extraction steam with highest ejection regenerative extraction steam pressure is ejected, so that mixed steam with the pressure higher than the one-section regenerative extraction steam pressure is obtained; and the mixed steam at the outlet of the jet heat pump heats feed water of the boiler to raise the temperature of the feed water.

Description

technical field [0001] The invention relates to a thermal power unit feedwater heating system, in particular to a thermal power unit low-load feedwater heating system. Background technique [0002] With the rapid development of my country's electric power industry, the peak-to-valley difference of the power grid has reached 50%, and thermal power units participate in the peak-shaving of the power grid more and more frequently. According to statistics from the my country Electricity Council, in recent years, the average annual utilization hours of thermal power units in China has been around 5,000 hours, the unit load rate has been lower than 60%, and the time ratio of units operating under variable conditions in the entire life cycle has reached 70%. When the thermal power unit operates at low load, the flow rate of the main steam decreases, and the pressure of the recovery steam at all levels also decreases, which reduces the temperature of the boiler feed water. On the one...

Claims

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Application Information

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IPC IPC(8): F22D1/32
Inventor 刘继平韩伟刘光耀严俊杰种道彤邢秦安王进仕
Owner XI AN JIAOTONG UNIV
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