Superheated steam temperature adjusting system and method suitable for SCR low-load operation

A superheated steam temperature, low load technology, applied in the direction of superheated temperature control, steam superheating, preheating, etc., can solve the problems of being unable to put into operation, etc., to save environmental protection expenses, low system transformation and operation costs, and reduce investment costs Effect

Inactive Publication Date: 2016-08-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] The purpose of the present invention is to provide an existing coal-fired power plant boiler as the transformation object, aiming at the problem that the SCR denitrification system currently in operation cannot be put into operation under low load, and to provide a method to change the arrangement of wat

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  • Superheated steam temperature adjusting system and method suitable for SCR low-load operation

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Embodiment Construction

[0019] Such as figure 1 As shown, a superheated steam temperature adjustment system suitable for operation under low SCR load includes a steam bypass system connected to the outlet header 14 of the low-temperature superheater to the first-stage water spray desuperheating 4, and a steam bypass system arranged in the economizer Economizer inlet feed water heater 12 before the inlet header 11 and various pipes and valves connected to the steam temperature regulating system.

[0020] A superheated steam temperature adjustment method suitable for SCR operation under low load. According to the situation of SCR inlet smoke temperature when the boiler is low load, if the SCR operation conditions are not met, the first one-way valve 8 and the first stop valve 9 are opened. , the flow regulating valve 10, the second stop valve 6, and the second one-way valve 5, and by adjusting the opening of the flow regulating valve 10, the steam at the outlet of the low-temperature superheater flows ...

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Abstract

The invention discloses a superheated steam temperature adjusting system and method suitable for SCR low-load operation. The system comprises a bypass system arranged between a low-temperature superheater outlet header and a first stage spray type desuperheater, a feed water heater arranged in front of an economizer inlet header, various pipes and valves, and the various pipes and the valves are connected with the steam temperature adjusting system. The steam flow of a low-temperature superheater is adjusted by adjusting the opening degrees of valves of the bypass system, so that part of superheated steam is used for heating economizer inlet fed water, the economizer inlet water temperature is increased, the heat exchange amount of an economizer system is reduced so as to control the fume temperature at an economizer outlet, and the fume temperature which does not reach the SCR operation condition originally at low load can meet the temperature requirement of SCR operation. The problem that a power plant SCR denitration system cannot be operated at low load is solved, and it is guaranteed that emission of nitric oxides in the full-load operation of a power plant meets the requirements.

Description

technical field [0001] The invention relates to a technical method for low-load flue gas denitrification of coal-fired boilers, which belongs to the technical field of coal-fired boiler emission reduction, and specifically refers to a system and method for regulating superheated steam temperature suitable for SCR low-load operation. Background technique [0002] my country's coal-based energy source determines that my country's air pollution is characterized by soot-type pollution. my country's existing coal-fired power generation equipment has a high overall coal consumption for power generation and low energy utilization, which further aggravates the gas emissions and environmental pollution caused by coal combustion. At the same time, my country's coal-fired power plants started late in the control of nitrogen oxide emissions, resulting in a rapid increase in the total amount of nitrogen oxide emissions. After nitrogen oxides enter the atmosphere, under the action of sun...

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Application Information

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IPC IPC(8): F22G5/12F22D1/12
Inventor 高正阳吕少昆高舒慈杨朋飞陈嵩涛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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