Thermal power plant deaerator cold-state starting heating device and method

Abstract

The invention relates to the technical field of deaerators, and discloses a thermal power plant deaerator cold-state starting heating device and method.The thermal power plant deaerator cold-state starting heating device comprises a water tank body, and a circulating heating structure is arranged at the upper end of the water tank body; the circulating heating structure comprises a deoxidizing head, a water inlet main pipe, three water outlet pipes, three detectors, three driving pumps and three circulating assemblies; according to the scheme, through the adoption of the circulating heating structure, only one path is added to the deoxidizing head in an original water feeding pump recirculation pipeline of the boiler water feeding system, cold water in the deaerator water tank is circulated to the deoxidizing head through the booster pump of the water feeding pump to be heated to the required temperature, and a deaerator circulating water pump does not need to be additionally arranged independently; the investment and the maintenance cost are saved; meanwhile, a reboiling heating method of the deaerator is abandoned, the problem of large vibration in the heating process of the deaerator is solved, the method is simple and practical, the heating speed is high, only about 40 minutes are needed for heating one tank of water to 100 DEG C, and the cold-state starting heating speed of the deaerator is greatly increased.

Description

technical field [0001] The invention relates to the technical field of deaerators, in particular to a cold-start heating device and method for a deaerator in a thermal power plant. Background technique [0002] The deaerator is an important equipment in the power plant. Its main function is to remove the oxygen and non-condensable gas in the boiler feed water to ensure the quality of the feed water. Water needs for water temperature. The cold start-up heating methods commonly used in power plant deaerators are: 1. The deaerator circulating water pump circulation heating method. In this method, a separate deaerator circulating water pump is set to circulate the feed water in the deaerator tank to the deaerator. The entrance of the deaerator enters the deaerator head and reheats until the required temperature; 2. The boiling heating method, this method directly passes the heating steam into the water in the deaerator water tank to heat the feed water. [0003] The existing c...

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Problems solved by technology

[0003] The existing cold start-up method of the deaerator has many disadvantages: Method 1 needs to set up the circulation pump of the deaerator separately, which requires a large investment in one-time equipment, and also increases the workload and cost of equipment operation and maintenance; Method 2 affects the amount of heating steam Difficult to control, the large amount of heating steam will cause strong vibration of the heating steam pipeline. A vicious accident of oxygen blasting; the heating steam is small, the heating effect is poor, and it takes a long time. It usually takes 4 to 5 hours to heat the water tank in the deaerator water tank to 100°C, which seriously affects the boiler startup progress. In view of this, in-depth research on the above problems , so this case arises

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