Comprehensive disposal system special for zero emission of thermal power plant

Abstract

The invention relates to a comprehensive disposal system special for zero emission of a thermal power plant, which comprises a cooling tower, a cooling tower bottom pool, a steam turbine, a steam condenser, a circulation water pump and a condensed water recovery pump, and mainly comprises two parts: 1, a circulation cooling water system descaling system; 2, a high salinity sewage evaporation and concentration purifying crystallizing system, wherein one outlet of an electrochemical water disposal system of the circulation cooling water system descaling system is communicated with the cooling tower bottom pool 18 and another outlet of the electrochemical water disposal system is communicated with the cooling tower bottom pool 18 through a filtering pool 28 of the circulation cooling water system descaling system; the steam condenser 4 is connected with a boiler 8 by the condensed water recycle pump 5, the steam condenser 4 is positioned between the steam turbine 2 and the condensed water recycle pump 5, the inlet of an evaporation heat exchanger 6 of the high salinity sewage evaporation and concentration purifying crystallizing system is communicated with the steam turbine 2 by a steam exhaust pipeline 25, and the outlet of the evaporation heat exchanger 6 is connected with the boiler 8 by the condensed water recovery pump 7. The comprehensive disposal system solves the problem of energy consumption of the zero emission at an evaporation condensation loop to a great extent, greatly reduces construction and operation cost of the zero emission and has great significance in energy saving and emission reduction of the thermal power plant.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, and in particular relates to a comprehensive treatment system specially aimed at zero discharge of thermal power plants. Background technique [0002] It has always been very difficult for thermal power plants to treat sewage such as sewage from the circulating cooling water system, desulfurization wastewater, membrane treated concentrated water, and electrodialysis concentrated water. The construction and operation costs are high, which has hindered the realization of the true zero emission goal of thermal power plants. In addition, the steam after the steam turbine has done work contains a lot of waste heat and is taken away in the circulating cooling water system. It is difficult to recycle this precious waste heat, resulting in a large waste of energy. [0003] The present invention proposes a comprehensive treatment system for zero discharge of thermal power plants, usin...

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Problems solved by technology

[0002] It has always been very difficult for thermal power plants to treat sewage such as sewage from the circulating cooling water system, desulfurization wastewater, membrane treated concentrated water, and electrodialysis concentrated water. The construction and operation costs are high, which has hindered the realization of the true zero emission goal of thermal power plants.

In addition, the steam after the steam turbine has done work contains a large amount of waste heat and is taken away in the circulating cooling water system. It is difficult to recycle this precious waste heat, resulting in a large waste of energy

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