Wide-threshold high-salinity wastewater concentration system

Abstract

The invention discloses a wide-threshold high-salinity wastewater concentration system which consists of a concentrator, a bubbling bed, a circulating spraying device, a demisting device, a condenser, a wastewater heater, a circulating pump, a high-salinity wastewater buffer tank, a high-salinity wastewater buffer pump, a disturbance pipe network and a centrifugal fan, the high-salinity wastewater buffer tank is communicated with the disturbance pipe network through the high-salinity wastewater buffer pump, and the disturbance pipe network is positioned at the lower part in the concentrator; high-salinity wastewater in the concentrator is communicated with a wastewater inlet of the wastewater heater through the circulating pump, a wastewater outlet of the wastewater heater is communicated with the circulating spraying device, and the circulating spraying device is positioned at the upper part in the concentrator; the bubbling bed is arranged in the middle of the concentrator, an air outlet of the centrifugal fan is communicated with the concentrator, and a demisting device is arranged above the circulating spraying device in the concentrator; and a gas outlet of the concentrator is communicated with a chimney through the condenser. The system has the advantages of high efficiency, energy conservation, low cost, no limitation of modification conditions, wide application range and the like, and can solve the problems of zero emission, concentration and decrement of desulfurization wastewater.

Description

technical field [0001] The invention relates to a wide-threshold high-salt wastewater concentration system, which belongs to the field of high-salt wastewater concentration and reduction in coal-fired power plants. Background technique [0002] Concentration and reduction of high-salt wastewater refers to the use of technical means to separate part of the water, leaving a higher concentration of salt, but the total amount is reduced. The purpose of concentration reduction is to reduce the amount of wastewater entering the subsequent solidification treatment, so as to reduce the total investment and operating costs of the wastewater treatment system. The existing concentration and weight reduction processes mainly include membrane concentration and weight loss, low-temperature flue gas waste heat evaporation weight loss, etc. Membrane concentration reduction requires softening and pretreatment of high-salt wastewater through processes such as clarification, filtration, ultra...

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Problems solved by technology

Membrane concentration reduction requires softening and pretreatment of high-salt wastewater through processes such as clarification, filtration, ultrafiltration, and reverse osmosis. There are problems such as complex treatment process and short membrane life cycle.

Low-temperature flue gas waste heat evaporation reduction is to use the 120-130°C flue gas waste heat before and after desulfurization to heat high-salt wastewater to achieve the purpose of evaporation reduction. Evaporation of 1t / h high-salt wastewater requires about 20000-25000Nm 3 / h flue gas, the disadvantages of this technology are firstly limited by the space of the desulfurization site, secondly, the amount of flue gas connected is large, and the power consumption of the fan is high, and thirdly, it is not suitable for projects with low and low temperature economizers before desulfurization

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