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Method and device for increasing water feed temperature at medium loads and low loads of steam turbine set

A technology for steam turbine unit and feed water temperature, which is applied in steam engine installations, mechanical equipment, machines/engines, etc., can solve the problems of small investment, large changes in feed water and steam extraction systems, etc., so as to reduce coal consumption, reduce denitration costs, and meet environmental protection requirements. Effect

Inactive Publication Date: 2016-10-26
GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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AI Technical Summary

Problems solved by technology

This method can increase the water supply temperature under low load by 20-25°C, but it needs enough civil engineering and installation space, and the changes to the water supply and steam extraction system are also relatively large, and the investment is not small

Method used

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  • Method and device for increasing water feed temperature at medium loads and low loads of steam turbine set
  • Method and device for increasing water feed temperature at medium loads and low loads of steam turbine set

Examples

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Embodiment 1

[0020] see figure 1 , a device for increasing the low-load feedwater temperature of a steam turbine unit. It is used on the No. 1 high-pressure heater 2 that maintains the water temperature of the feedwater through a section of steam extraction pipe 3 connected to high-pressure cylinder 1. The section of steam extraction pipe 3 is sequentially installed with a Pumping backstop door 6, one pumping electric door 7 and No. 1 high-pressure heater steam inlet electric main door 8, the device includes zero pumping pipeline 4 and zero pumping backstop door 9 installed on the zero pumping pipeline 4 in sequence, Zero-extraction electric door 10, zero-extraction adjustment door 11, desuperheater 12 and zero-extraction electric main door 13, said high-pressure cylinder 1 is provided with a zero-extraction steam extraction point, and the extraction pressure of said zero-extraction steam extraction point is higher than that of the connected Describe the steam extraction pressure of one se...

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Abstract

The invention discloses a method and device for increasing the water feed temperature at medium loads and low loads of a steam turbine set. A new zero-extraction steam extraction heat regeneration module is additionally installed in front of a steam extraction point, is guided out from the new steam extraction point and is connected to an original steam extraction pipe section, when the unit load is lowered to a certain degree (about 35%-40%), the SCR entrance smoke temperature is lower than 310 DEG C and denitration commissioning is difficult, the steam extraction operation is switched into the newly-arranged steam extraction operation, the water feed temperature at an outlet of a first high-pressure heater can be increased through the new steam extraction module, the circulation heat efficiency can be improved, further the coal consumption can be reduced, the denitration inlet smoke temperature at the low loads is increased, a denitration system can be operated at high efficiency at full-load sections, the environmental requirement is met, the denitration cost is lowered, and the economic benefit and the environmental protection benefit are remarkable.

Description

technical field [0001] The invention relates to the technical field of energy and environmental protection, in particular to a method and a device for increasing the temperature of low-load feed water in a steam turbine unit. Background technique [0002] Under the current domestic power market environment, the load rate of coal-fired units is decreasing year by year, and with the country’s vigorous investment in nuclear power and new energy, and the commissioning of a number of new coal-fired units, the load rate of coal-fired units will continue to decrease in the future , and the possibility of deep peak regulation (40% load) is greatly increased. At present, when the load of most thermal power plants is below 40%, the temperature of the boiler feed water, that is, the outlet water temperature of the No. 1 high-pressure heater is 20-25°C lower than the design value, and the flue gas temperature at the denitrification inlet is low, making it difficult to normally put the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K7/38
CPCF01K7/38
Inventor 谭锐薛海邵峰
Owner GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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