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Denitration system and method for thermal power generating unit

A thermal power unit and denitrification technology, applied in lighting and heating equipment, etc., can solve complex problems, increase funds and occupy land, and achieve the effects of avoiding waste, saving funds, occupying land, and saving costs

Pending Publication Date: 2022-04-08
HUANENG POWER INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the problem to be solved by the present invention is that the existing water flow recirculation device needs large-scale technical transformation, increases funds and occupies an area and is too complicated

Method used

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  • Denitration system and method for thermal power generating unit
  • Denitration system and method for thermal power generating unit

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Experimental program
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Effect test

Embodiment 1

[0036] A denitrification system for thermal power units provided in this embodiment includes: a flue gas pipeline, a heating device 10 and a denitrification device; figure 1 As shown, there is a flue gas pipeline in the thermal power unit, and the flue gas pipeline has a flue gas inlet 1 and a flue gas outlet 2; a heating device is arranged between the flue gas inlet 1 and the flue gas outlet 2 10. The heating device 10 has a circulation pipeline, and a heating medium circulates in the circulation pipeline. The heating medium is preferably steam; the circulation pipeline is connected with the boiler 6; The inlet of the denitrification device is connected.

[0037] During use, start-up boiler 6 steam is used to heat part of the flue gas in the flue, so that the temperature of the flue gas at the denitrification inlet is higher than the temperature required for denitrification operation, and there is no need for new equipment and large-scale technical transformation, saving mone...

Embodiment 2

[0045] The denitrification method for thermal power units provided in this embodiment includes the following steps:

[0046] The thermal power unit is started, and the boiler 6 is turned on, and the boiler 6 heats the heating medium in the heating device 10;

[0047] The heating medium of the heating device 10 exchanges heat with the flue gas in the flue gas pipeline, so that the flue gas in the flue gas pipeline meets the temperature requirements of the denitrification device;

[0048] As the start-up time of the thermal power unit gradually increases, the gate valve 7 of the inlet bypass pipeline is gradually closed, and the temperature of the flue gas in the flue gas pipeline reaches the standard, and the inlet bypass pipeline is closed. .

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Abstract

The invention provides a denitration system and method for a thermal power generating unit, and belongs to the technical field of thermal power plant flue gas denitration, and the denitration system for the thermal power generating unit comprises a flue gas pipeline with a flue gas inlet and a flue gas outlet; the heating device is arranged between the flue gas inlet and the flue gas outlet; the heating device is provided with a circulating pipeline, and a heating medium circulates in the circulating pipeline; the circulating pipeline is communicated with the boiler; an inlet of the denitration device is communicated with the flue gas outlet. According to the invention, boiler starting steam is utilized to heat part of flue gas in the flue, so that the temperature of the flue gas at a denitration inlet is higher than the temperature required by denitration commissioning, equipment does not need to be newly added and large technical improvement does not need to be implemented, and funds and occupied land are saved.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification in thermal power plants, in particular to a denitrification system and method for thermal power units. Background technique [0002] In the thermal power unit, in order to meet the NOx emission concentration requirements of the unit, the thermal power unit is equipped with a denitrification device, and the catalyst of the denitrification device usually has a working temperature range of 300-420 °C. When the thermal power unit is in low-load operation, the flue gas temperature at the inlet of the denitrification device is usually lower than 300°C, which cannot meet the temperature required by the denitrification device during the denitrification process, making the reaction incomplete, resulting in substandard environmental protection indicators. [0003] In the prior art, the problem that the flue gas temperature at the inlet of the denitrification system of the heating unit is lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/00F23J15/02F23J15/08
Inventor 刘思宇李辉许文凤赵文韬
Owner HUANENG POWER INT INC