All-backheating drainage system of heat supply network heater for supercritical concurrent boiler thermal power plant

A heating network heater and once-through boiler technology, applied in lighting and heating equipment, preheating, supplementary water supply, etc., can solve problems such as difficulty in ensuring the quality of boiler feed water, heat loss from heating network heater drainage, and boiler safety impacts, etc.

CN101886804AActive Publication Date: 2010-11-17NORTH CHINA POWER ENG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2010-11-17

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Abstract

The invention relates to an all-backheating drainage system of a heat supply network heater for a supercritical concurrent boiler thermal power plant. Condensed water in a condenser passes through a shaft seal cooler of a condensed water system and then enters into a condensed water precision processing device; a drainage water cooling section is arranged in the heat supply network heater, and drainage water in the heat supply network heater is cooled by the drainage water cooling section; the cooled drainage water is boosted by a drainage pump, then passes through a drainage water cooler and exchanges the heat with condensed water from the condensed water precision processing device in the drainage water cooler; the heat-exchanged drainage water and the condensed water from the shaft seal cooler of the condensed water system are mixed to enter the condensed water precision processing device; and the condensed water from the condensed water precision processing device returns to the system after heat exchange, therefore, the desalting of more than 80 percent of a unit steam-water system through a chemical processing system is ensured, the boiler feedwater quality is ensured, and the long-term safety operation of a supercritical concurrent boiler and the heat exchange between the drainage water of the heat supply network heater and the heat supply network are also ensured; and compared with schemes of partially recovering the heat and then discharging the heat to the condenser, the invention improves the efficiency by a larger extent.
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Description

technical field

[0001] The invention relates to a supercritical (direct-current boiler) heat network heater drainage system for a steam turbine generator set in a thermal power plant. The influence of entering the condenser on the efficiency of the unit maintains that the efficiency of the unit does not decrease basically. Background technique

[0002] At present, the heating and heating units are mainly subcritical and below parameters, and the 300MW class extraction and condensing units are the most assembled units. Now the parameters of the steam turbine generator units are gradually increasing, and the supercritical heating units are gradually entering the power system.

[0003] At present, domestic units of 300MW and above are generally equipped with condensate polishing equipment to perform deep desalination of condensate to ensure the quality of condensate. The boiler evaporation capacity of the 300MW heating and heating unit is about 1000t / h, the steam extraction ca...

Examples

Embodiment Construction

[0027] In order to enable the examiner to understand the system composition and implementation of the present invention, the description is as follows in conjunction with the drawings:

[0028] The water-repellent mode of the heat network heater of the present invention is as follows: Figure 4 and Figure 5 As shown, the condenser 3 is connected to the shaft seal cooler 7 of the condensate system, the outlet end of the shaft seal cooler 7 of the condensate system is connected to the water inlet end of the condensate polishing equipment 6, and the heating network heater 1 is connected to the drain cooling The water inlet A of the drain cooler 5 is connected, the outlet B of the drain cooler 5 is connected with the outlet E of the shaft seal cooler of the condensate system, and the heat exchange inlet C of the drain cooler 5 is connected with the outlet of the condensate polishing equipment F is connected, and the heat exchange outlet D of the hydrophobic cooler 5 is connected...