Electrostatic precipitator heat exchange system

Abstract

The invention discloses an electric dust removal heat exchange system which comprises an electric dust remover, a desulfurizing tower, a fume cooler, a fume re-heater and a heat medium circulation channel, wherein the fume cooler is arranged at the front end of the electric dust remover, the fume re-heater is arranged at the rear end of the desulfurizing tower, the heat medium circulation channel is connected with a steam turbine condensate system, the steam turbine condensate system is formed by connecting condensate channels of all stages of heaters of a steam turbine in series, the heat medium circulation channel comprises a water outlet channel and a water return channel, one ends of the water outlet channel and the water return channel are connected onto the condensate system, the other end of the water return channel is connected to a water inlet of the fume re-heater, a water outlet of the fume re-heater is connected to a water inlet of the fume cooler, and a water outlet of the fume cooler is connected to the other end of the water return channel. According to the electric dust removal heat exchange system, no extra energy is consumed during operation of a heat medium system. Energy required from the fume cooler by the heat medium fully returns to a thermodynamic system of the steam turbine, and no extra energy is consumed, so that compared with the prior art, the electric dust removal heat exchange system is excellent in the angle of the energy efficiency.

Description

technical field [0001] The invention is applied to the field of electric dust removal for power station boilers, and in particular relates to a low-low temperature electric dust removal heat exchange system with simple structure and no influence on the operation of steam turbines. Background technique [0002] Dust emission from coal-fired power plant boilers is one of the main causes of environmental pollution and smog in my country. Almost all dust removal equipment for power plant boilers in my country use electrostatic precipitators. Although many power plants have upgraded the electrostatic precipitator equipment in recent years, the soot emission concentration of quite a few power plants has exceeded the limit value of the soot emission standard in the "Emission Standard of Air Pollutants for Pulverized Coal Boilers in Power Stations (GB 13223-2011)" , namely 20~30mg / Nm 3 . [0003] With the improvement of environmental protection requirements, in 2014, the State Co...

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Problems solved by technology

However, by analyzing the system, it can be seen that for the scheme where the main condensed water first enters the flue gas cooler (to cool the flue gas at the boiler outlet), after being heated, it is sent to the "clean" flue gas reheater, the flue gas cooler The inlet temperature of cooling water (main condensate) should neither be too low (not lower than 60-65°C) nor too high. If the temperature of cooling water is too high and the temperature difference between flue gas and cooling water is too small, the It is not easy to achieve the requirement of reducing the flue gas temperature from about 150°C to 80-100°C

[0032] Therefore, the system adopts the main condensate water intake before No. 8 low-loading 1. Taking water from here will definitely displace the pumping capacity of No. 7 and No. 8 low-pumping, thus adversely affecting the thermal efficiency of the thermodynamic cycle.

[0033] In addition, in order to prevent the temperature of the heat medium entering the flue gas cooler from being too low at low load, the system should also add a hot water recirculation pump 19 between the heat medium at the outlet of the flue gas cooler and the heat medium at the inlet, so that the system and its regulation are too low. Complicated and consumes extra energy

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