Hot-pressing type ultra supercritical unit number-zero high-pressure heater and switching system thereof

A technology of ultra-supercritical unit and switching system, which is applied in the field of hot-pressed ultra-supercritical unit zero high-intensity and its switching system. problem, to achieve the effect of reducing the outlet smoke temperature, increasing the feed water temperature, and ensuring normal operation

Active Publication Date: 2016-09-21
张曙光
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The efficiency of the unit under low load conditions is lower than the design value;
[0005] 2. Under low load conditions, the flue gas temperature at the outlet of the economizer is low, which cannot guarantee the denitrification efficiency

Method used

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  • Hot-pressing type ultra supercritical unit number-zero high-pressure heater and switching system thereof
  • Hot-pressing type ultra supercritical unit number-zero high-pressure heater and switching system thereof
  • Hot-pressing type ultra supercritical unit number-zero high-pressure heater and switching system thereof

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Embodiment example

[0045] Taking a 1000MW ultra-supercritical unit in a power plant as an example, the power steam of the hot press is taken from the main steam, and after a section of steam is pumped, the mixed steam enters the No. 0 high-pressure heater. The previous thermal parameters of the unit are as follows: The table below It shows that the heat consumption after putting into No. 0 high-speed heating is reduced by 29kj / (kW.h) under the condition of 75% load, and is reduced by 32kj / (kW.h) under the condition of 50% load. Calculation of calorific value 29300kj / kg, under 75% load condition, the coal consumption of the unit for power generation is reduced by 1.075g / kWh, and under the condition of 50% load, the coal consumption of the unit for power generation is reduced by 1.186g / kWh. If the annual power generation in this load segment is calculated as 3 billion kWh, about 3,300 tons of standard coal can be saved each year, which has significant energy-saving and emission-reduction benefits...

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Abstract

The invention provides a hot-pressing type ultra supercritical unit number-zero high-pressure heater, a switching system thereof and a novel technological process for improving the low-load running economical efficiency of thermal power generating units. A hot press, the number-0 high-pressure heater and related valves and pipe fittings connected with the hot press and the number-0 high-pressure heater are used as core parts of the technological process, and all other devices are devices of existing units. The technological process has a main effect of adding a level of regenerative heating to an existing steam extraction heat recovery system, the thermal economical efficiency of the units under low loads is improved, the smoke temperature of an outlet of an economizer can be effectively improved, and the removal efficiency of a denitration system under the low-load work condition is ensured. In addition, due to input of the set of technological process, the air temperature can be effectively increased, and impact generated on the unit thermal economical efficiency and the boiler safety under the high-pressure cut-off work condition can be relieved.

Description

technical field [0001] The invention relates to a regenerative heating system of a power plant. In particular, it relates to a hot-press type ultra-supercritical unit zero high-pressure generator and its switching system. Background technique [0002] In recent years, the average annual utilization hours of thermal power units in my country has continued to decrease, and the load rate of most units is less than 70%. Under low load conditions, the thermal economy and safety of the units will decline significantly. Improve the heat recovery system to improve the thermal economy of the unit under low load conditions. From the perspective of thermodynamics, the more heat recovery stages of the unit, the higher the thermal efficiency. However, due to factors such as the structure of the steam turbine, the heat recovery stages are also subject to certain restrictions. At present, 7-9 heat recovery stages are often used. . The Chinese patent application number 201210047719.1 disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/32F22D1/50
CPCF22D1/32F22D1/50
Inventor 张曙光
Owner 张曙光
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