Full-load selective catalytic reduction (SCR) denitration system of coal-fired boiler

A coal-fired boiler, full-load technology, applied in the direction of lighting and heating equipment, gas treatment, membrane technology, etc., can solve the problem that the system cannot be put into normal operation, so as to facilitate the removal of NOx, increase the temperature of raw flue gas, and reduce the The effect of ammonia slip

CN110141961APending Publication Date: 2019-08-20SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-08-20

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Abstract

The invention relates to a full-load selective catalytic reduction (SCR) denitration system of a coal-fired boiler. The system comprises a denitration reactor and an air preheater; the air preheater comprises a flue gas channel and an air channel; a flue outlet of the denitration reactor is connected with an electrostatic dust removal device through the flue gas channel of the air preheater; the input end of the air channel of the air preheater is connected with an air blower; the output end of the air channel is connected with a secondary air box; the system further comprises an air heater; the input end of the air heater is connected with an air suction port of a pressure cylinder close to a steam turbine of a generator set and is connected with the output end of the air channel of the air preheater; and the output end of the air heater is connected with a flue inlet of the denitration reactor. Compared with the prior art, the system has the advantages that full-load full-period stable operation of the coal-fired boiler can be ensured at lowest technology output, NOx emission in flue gas meets the emission requirements set by the country, and full-load denitration operation in the true sense after the grid connection can be realized.
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Description

technical field

[0001] The invention relates to the fields of exhaust gas purification and energy environmental protection in coal-fired power generation, in particular to a full-load SCR denitrification system for coal-fired boilers. Background technique

[0002] my country's coal-based energy structure will not change for a long time. Therefore, controlling NOx emissions in the combustion flue gas of coal-fired boilers is an important task for my country to control atmospheric environmental pollution. Take NH 3 The NOx Selective Catalytic Reduction (SCR) technology as a reducing agent is the most widely used and most effective coal-fired boiler flue gas denitrification technology in the coal-fired power generation industry in recent years.

[0003] Selective catalytic reduction (SCR) technology requires flue gas to have a certain temperature range according to the different catalysts used. Within this temperature range, selective catalytic reduction (SCR) NOx can reduce t...

Examples

Embodiment

[0033] In view of the problem that the SCR denitrification device cannot operate when the coal-fired unit is started or operated at low load, this application proposes a full-load SCR denitrification system for coal-fired boilers to reduce nitrogen oxide emissions. Under normal circumstances, since the installed quantity of coal-fired generating units is generally configured with more than two units, when more than one unit is in operation, and when the other unit is in the startup or shutdown phase, this system uses the high-temperature extraction steam of the operating unit, Heating the hot secondary air of the start-up or shutdown unit, spraying the further heated high-temperature secondary air into the catalyst reaction area through reasonable flow field optimization, and mixing with the original hot flue gas in the tail flue, it can Directly increase the temperature field in the catalyst reaction area.

[0034] Such as figure 1 As shown, the system includes a denitration...