A control system and method for a heat medium water tube heat exchanger

Abstract

The invention relates to a control system for a heat medium water pipe type heat exchanger. The control system comprises flue gas coolers, a flue gas heater, a heat medium water-filling tank, heat medium water pumps, a heat medium water vapor heater, a channel A heat medium water inlet adjusting valve, a channel B heat medium water inlet adjusting valve, a heat medium water bypass adjusting valve and a vapor adjusting valve. The heat medium water-filling tank is connected with the flue gas heater and the heat medium water pumps. The heat medium water pumps are connected with the channel A heat medium water inlet adjusting valve and the channel B heat medium water inlet adjusting valve correspondingly. The channel A heat medium water inlet adjusting valve and the channel B heat medium water inlet adjusting valve are connected with one set of flue gas coolers correspondingly. The two sets of flue gas coolers are connected to the heat medium water vapor heater which is then connected to the flue gas heater. The control system for the heat medium water pipe type heat exchanger has the beneficial effects that the flue gas temperature of outlets of the flue gas coolers can be well controlled to be maintained in a certain range, and the high dust removal efficiency of an electric precipitator is better ensured.

Description

technical field [0001] The patent of the present invention relates to a control system and method, in particular to a control system and method for a heat medium water pipe heat exchanger. Background technique [0002] In order to solve the common problem of "gypsum rain" in coal-fired power plants and better meet the increasingly stringent emission requirements of flue gas pollutants, heat medium water pipe heat exchangers are generally installed, which include flue gas coolers and flue gas heating device. It can achieve the following three purposes: the flue gas cooler is installed in front of the dry electrostatic precipitator to reduce the temperature of the flue gas entering the electrostatic precipitator, and to control the temperature entering the electrostatic precipitator within a certain range under various working conditions Inside, to ensure a high dust removal efficiency of the electrostatic precipitator; the flue gas heater is arranged behind the wet electrost...

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Problems solved by technology

[0003] During the start-up phase of the unit, the boiler is ignited to produce flue gas SO 2 , SO 3 As well as flue gas water mist, if the water temperature of the flue gas cooler and flue gas heater is lower than the flue gas temperature, it will cause condensation and corrosion on the pipe wall of the flue gas cooler and flue gas heater, and at the same time, due to the location of the flue gas cooler The concentration of smoke and dust in the environment is high, which is easy to make the smoke and dust adhere, accumulate dust and scale, affect the heat exchange surface and deteriorate

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