System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit

An ultra-supercritical unit and commissioning rate technology, which is applied in the fields of dispersed particle separation, nitrous oxide capture, gas treatment, etc., can solve the problems of low feed water temperature, low catalyst normal use temperature, and denitrification device out of operation, etc. The system is simple and easy to operate, the structure changes are small, and the investment is low.

Inactive Publication Date: 2016-03-30
GUANGDONG HUIZHOU PINGHAI POWER PLANT CO LTD
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Problems solved by technology

[0002] At present, most of the denitrification devices in coal-fired power plants are selective catalytic reduction, and the catalysts used usually have a working temperature range of 300-400 ° C. If the temperature exceeds the range, the catalyst will not be able to play its due role.
In the design of conventional thermal power plants, there will be the following problems: when the load of the unit is high, the flue gas temperature at the inlet of the denitrification device (the flue g

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  • System for improving denitration operation rate of Siemens 1000MW/600MW ultra-supercritical unit

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Embodiment 1

[0023] Such as figure 1 , 2 As shown, a system for improving the denitrification operation rate of Siemens 1000MW / 600MW ultra-supercritical unit includes denitrification device, boiler, high-pressure cylinder and high-pressure heater. Switching from the original 1-stage steam extraction system to the 0-stage steam extraction system, the newly added 0-stage steam extraction process is as follows: reversely extract steam from the inlet of the high pressure cylinder (the steam supplement valve no longer needs to use its original function), in this embodiment, the steam supply valve is used as a steam-operated regulating valve, and after the extracted steam passes through the electric gate valve 3 and the pneumatic check valve 5, it enters the steam desuperheater 7 (with a safety valve 8 to prevent system overpressure) for desuperheating , decompression to meet the safety requirements of the high-pressure heater and the temperature rise of the feed water. After the temperature re...

Embodiment 2

[0026] Reference attached image 3 , 4 , the newly added 0-stage steam extraction process is: reversely extract steam from the steam supply inlet of the high-pressure cylinder (at this time, the steam supply valve is closed to isolate the main steam), and the steam extraction passes through the electric gate valve 3 and the pneumatic check valve 5 Finally, enter the pneumatic control valve 6 and steam desuperheater 7 (with safety valve 8 to prevent system overpressure) for temperature reduction and decompression to meet the safety requirements of the high-pressure heater and feed water temperature rise. After desuperheating and decompression, the steam It is divided into two branches, A and B, which are respectively connected to 1A high-pressure heater and 1B high-pressure heater through electric gate valve 10 and electric gate valve 11. The system sets up necessary drainage pipelines according to the pipeline layout and operation requirements, as shown in Figure 2 and 4 and ...

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Abstract

The invention discloses a system for improving denitration operation rate of a Siemens 1000MW/600MW ultra-supercritical unit, which comprises a denitration device, a boiler, a high-pressure cylinder and a high-pressure heater, wherein when the unit operates in low load, a feed water heating steam source of the high-pressure heater is switched to a 0-section steam suction system from original 1-section steam suction, the 0-section steam suction system comprises that the steam is sucked out reversely from a supply steam inlet of the high-pressure cylinder, the sucked steam enters a steam cooler to be cooled and decompressed to adapt to safe and feed water temperature requirement of the high-pressure heater after passing through an electric gate and a pneumatic check valve, and the cooled and decompressed steam is divided into A and B branches which are respectively introduced to 1A and 1B high-pressure heaters through electric gates, and the system is provided with dredging pipelines according to the pipe arrangement condition and operation requirements. The system is used for solving the problem that denitration is limited when the Siemens 1000MW/600MW ultra-supercritical unit is in a low-load operation mode, and is simple and easy to operate, and small in change of the existing structure and low in investment.

Description

technical field [0001] The invention relates to the technical field of denitrification in coal-fired power plants, in particular to a system for improving the denitrification commissioning rate of Siemens 1000MW / 600MW ultra-supercritical units. Background technique [0002] At present, most of the denitrification devices in coal-fired power plants are selective catalytic reduction, and the catalysts used usually have a working temperature range of 300-400 ° C. If the temperature exceeds the range, the catalyst will not be able to play its due role. In the design of conventional thermal power plants, there will be the following problems: when the load of the unit is high, the flue gas temperature at the inlet of the denitrification device (the flue gas temperature at the outlet of the economizer) is just within the normal operating range of the catalyst; The temperature is low, lower than the normal use temperature of the catalyst. This is because, if the flue gas temperatur...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/90B01D53/86
CPCB01D53/8625B01D53/8696B01D53/90B01D2251/2062B01D2257/402B01D2257/404B01D2259/4591Y02C20/10
Inventor 李焕辉甘文亮陈强蒋波
Owner GUANGDONG HUIZHOU PINGHAI POWER PLANT CO LTD
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