Supercritical Once-through Boiler Ignition Steam Blowpipe Energy Saving and Emission Reduction Commissioning Method

Abstract

The invention discloses an energy conservation and emission reduction debugging scheme of supercritical once-through boiler ignition steam purging. The energy conservation and emission reduction debugging scheme comprises the following working procedures: firstly, cold-state mass-water washing: drawing off water three times in a whole furnace; secondly, cold-state recycle washing: when Fe<+> at the outlet of a startup separator is greater than 1000 mu g / L, carrying out cold-state drainage washing, draining until recycled water is returned; when the water quality Fe<+> at the outlet of the startup separator is smaller than 1000 mu g / L, draining and recycling to a condenser, putting into a fine treatment pre-filter, washing, dewatering and beginning to recycle to a circulating water system; when the water quality Fe<+> at the outlet of the separator is smaller than 500 ug / L, putting into a high-speed mixed bed, beginning closed type cold-state washing; when the water quality Fe<+> of a water storage tank is smaller than 100 ug / L, stopping washing; thirdly, hot-state mass-water washing: putting into a deaerator to heat and wash on a machine side, performing tiny-oil ignition in the boiler to perform hot-state washing, and when the water quality Fe<+> of the water storage tank is smaller than 100 ug / L, stopping washing; and fourthly, steam purging: after the hot-state mass-water washing is qualified, carrying out steam purging by using a disturbance purging manner.

Description

technical field [0001] The invention belongs to the technical field of blowing pipes of supercritical once-through boilers, and in particular relates to an energy-saving and emission-reducing debugging method for ignition steam blowing pipes of supercritical once-through boilers. Background technique [0002] Boiler steam blowing is an indispensable link before the complete start-up of the whole unit, and it is an important link to avoid the clogging of the superheater and reheater in the later stage and ensure the safe operation of the steam turbine. During the blowing process, ensure that the kinetic energy of the steam in the pipeline is greater than the kinetic energy of the steam when the boiler BMCR (maximum continuous evaporation capacity of the boiler), the blowing coefficient K>1, and the cleanliness of the superheater and reheater pipes. [0003] At present, most domestic thermal power units of 300MW and above adopt the method of conventional step-down blowpipe,...

AI Technical Summary

Problems solved by technology

The existing blowing method lasts too long, and the number of blowing times increases the consumption of demineralized water and fuel, resulting in the waste of non-renewable resources and the increase of pollutant emissions; In particular, thick-walled components will produce a large thermal shock, and the blowing time is too long or the number of times is too many will affect the life of the boiler; in addition, the impact on the temporary system during the blowing process is also large, and frequent opening and closing of the blowing door is likely to cause damage to the valve. Prolonged duration can also create a safety hazard for temporary systems

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