Energy-saving dust removing and intelligent regulation synergetic white smoke removing system and energy-saving dust removing and intelligent regulation synergetic white smoke removing method

Abstract

The present invention relates to an energy-saving dust removing and intelligent regulation synergetic white smoke removing system and an energy-saving dust removing and intelligent regulation synergetic white smoke removing method. The energy-saving dust removing and intelligent regulation synergetic white smoke removing system comprises a desulfurization tower, a flue gas phase-change condensation device, a wet electrostatic multi-precipitator, a flue gas heating white smoke removing device and an intelligent temperature regulation system, wherein the desulfurization tower, the flue gas phase-change condensation device, the wet electrostatic multi-precipitator, the flue gas heating white smoke removing device and the intelligent temperature regulation system are sequentially communicated, the flue gas phase-change condensation device and the wet electrostatic multi-precipitator are respectively communicated to a water discharging box, the water discharging box is communicated to the desulfurization tower and a circulation water box, and the circulation water box is communicated to a wet electrostatic multi-precipitator spraying water pipe and a demister rinsing water pipe through a self-washing filter. According to the present invention, the system has advantages of high stability, low investment, low operation cost, and simpleness; the smoke discharging temperature is intelligently regulated, such that the flue gas discharging with characteristics of high reliability, low cost and no significant visible white smoke is achieved; the water in the system can be repeatedly utilized so as to reduce the waste of the water resource, and the boiler low-grade steam is used as the heat source so as to reduce the energy consumption by more than 10%; and with the system and the method, the advantages of low energy consumption and no white smoke emission are provided while the particulate matter removing efficiency is comprehensively improved by more than 20%, and the gas-stage SOx synergistic removal efficiency is improved by more than 10%.

Description

technical field [0001] The invention belongs to the technical field of coal-fired flue gas pollutant control, and specifically relates to a coal-fired power plant energy-saving, dust-removal and efficiency-enhancing collaborative intelligent regulation and whitening removal system and method. Background technique [0002] With the promulgation of the "Notice on Printing and Distributing the Action Plan for Upgrading and Transformation of Coal Power Energy Conservation and Emission Reduction (2014-2020)" (Fagai Energy [2014] No. The emission concentration of air pollutants from coal has basically reached the emission limit of gas turbines (that is, under the condition of a reference oxygen content of 6%, the emission concentrations of soot, sulfur dioxide, and nitrogen oxides are not higher than 10, 35, and 50 mg / m3, respectively). The main technical route to achieve the ultra-low emission requirements of soot and sulfur dioxide is the integrated wet desulfurization and dust ...

AI Technical Summary

Problems solved by technology

The energy consumption of direct steam heating method is large, resulting in the loss of water, and at the same time, the smoke and SO x No corresponding deep removal

The saturated wet flue gas condensation method controls the phase change degree of the process through an external condensation source, and cooperates with a high-efficiency demister to effectively promote the condensation of fine particles and remove condensation. The method can reduce emissions, reduce water consumption, and consume less energy, but the corresponding The effect of white mist removal is greatly affected by the external environment temperature. When the ambient temperature is low, the effect of white mist removal is not good. To deeply solve the white fog, it is necessary to further heat the saturated wet flue gas

[0006] Chinese patent CN102980171A discloses a coal-fired boiler flue gas waste heat deep recovery utilization and flue gas condensation desulfurization and dust removal economizer, and provides an economizer that utilizes the latent heat of vaporization of water vapor in flue gas. The patent involved The technology utilizes the latent heat of vaporization of part of the water vapor in the flue gas, but the water in the flue gas is not used by clean separation, and the effect of removing white smoke is not good

[0007] Chinese patent CN104930539A discloses a flue gas recovery system of a coal-fired power plant and an energy-saving and water-saving ultra-clean discharge method. By adding a low-temperature economizer, a vacuum flash flash condensing device and a low-temperature heat pump heat exchange device, the flue gas can be saved, water-saving and reduced. However, if the exhaust gas temperature is between 30 and 40 °C, it is difficult to achieve no white smoke emission in areas with low ambient temperature, and the system is relatively complex, with high failure rate, large floor area, and difficult operation. High maintenance cost

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