Energy-saving emission reduction system and energy-saving emission reduction method of horizontal type phase change heat exchanger and front-arrangement type water medium type GGH combined

Abstract

The invention relates to an energy-saving emission reduction system and an energy-saving emission reduction method of a horizontal type phase change heat exchanger and a front-arrangement type water medium type GGH combined. At present, no systems and methods which are reasonable in design, save energy and reduce emissions exist. The energy-saving emission reduction system is characterized in that a phase change heat exchange steam pocket is located above the phase change heat exchanger, and is connected with the phase change heat exchanger through an ascending pipe and a descending pipe, and a water steam condensation cavity is formed in a shell side of the phase change heat exchange steam pocket; and a pipe side inlet and a pipe side outlet of the phase change heat exchange steam pocket are connected with a condensate water leading-out pipe and a condensate water leading-in pipe of a low-pressure heater. The energy-saving emission reduction method is characterized in that smoke obtained after dust removal is heated to 80 DEG C through a smoke purification reheater, enters a chimney and is exhausted to air, and the problem of white smoke emitting of a power plant chimney is solved. The system and the method can efficiently treat the smoke of the boiler, the smoke exhaust temperature is reduced, the portion of the low-pressure heater is heated, and therefore water is condensed, and the energy-saving effect is achieved.

Description

technical field [0001] The invention relates to an energy-saving and emission-reduction system and a method for combining a horizontal phase-change heat exchanger with a front-mounted water-medium GGH, and is mainly used in the field of coal-fired power plant boilers, capable of recovering waste heat of flue gas and reducing the energy consumption of power plant boilers. Emissions. Background technique [0002] Due to many reasons such as design and manufacture, operation adjustment, and coal type change of many coal-fired power plant boilers in China, the exhaust gas temperature of the boiler seriously deviates from the design value, which is about 20°C-50°C higher than the design value. The high exhaust gas temperature will increase the heat loss of the exhaust gas and reduce the efficiency of the boiler, which directly affects the economical operation of the thermal power unit and is not conducive to energy saving. An increase in the exhaust gas temperature will also inc...

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Problems solved by technology

For example, in the Chinese patent with the publication number CN104100994, a boiler energy-saving and emission-reduction system based on flue gas waste heat recovery and reheating technology is disclosed. Heating the closed circulating water, part of the closed circulating water enters the net flue gas reheater between the desulfurization tower and the chimney to raise the temperature of the net flue gas to above 80°C, and the other part enters the condensation of the heating pressure heater of the flue gas waste heat recovery device Water, this system not only solves the phenomenon of "white smoke" from the chimney, but also recovers part of the waste heat to squeeze out the low-pressure extraction steam, which has the effect of saving energy. Level convective heat transfer leads to a large heat transfer area and heavy equipment, which increases the cost of the equipment. In addition, the heating surface of the net flue gas reheater is made of metal, which has certain corrosion and reduces the service life of the equipment.

[0006] To sum up, there is currently no one that can efficiently treat boiler flue gas, reduce the exhaust gas temperature, heat part of the condensed water of the low-pressure heater, and achieve energy-saving effects; improve dust removal efficiency and reduce pollutant emissions; Energy-saving and emission-reduction system and method for combining horizontal phase-change heat exchanger with front-mounted water-medium GGH for white smoke problem

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