Waste water treatment system, multi-path processing system and multi-level processing system

Abstract

The invention discloses a waste water treatment system, a multi-path processing system and a multi-level processing system. The waste water treatment system comprises a pre-evaporator, a draught fan,a boiler furnace, a slag pit, a slagging door and a slagging machine. The core is a flue gas circulating loop formed by connecting the pre-evaporator, the draught fan and the slag pit through flue pipes; specifically, the slag pit is connected with the draught fan through a low pressure and high temperature flue pipe, the draught fan is connected with the pre-evaporator through a high pressure andhigh temperature flue pipe, and the pre-evaporator is connected with the slag pit through a low pressure and low temperature flue pipe to form a closed flue gas circulating loop; a waste water supplypipeline is arranged on a waste water inlet of the pre-evaporator, and a waste water outlet is connected with the slag pit through a waste water drainage pipeline. The waste heat of a furnace bottomand the waste heat of furnace clinker are sufficiently utilized, waste water preheating, concentration, evaporation and crystallization treatment of waste water are realized through the flue gas circulating loop, waste water treatment and the utilization of furnace clinker waste heat are realized, the investment and the operation cost of waste water treatment are reduced, the equipment reliabilityis improved, the air leakage of furnace bottom is reduced, and the boiler efficiency is improved.

Description

technical field [0001] The invention relates to a waste water treatment system, a multi-path treatment system and a multi-stage treatment system, and belongs to the technical field of thermal power generation waste water treatment. Background technique [0002] Wastewater treatment in coal-fired thermal power plants mainly includes steam multi-effect evaporation, membrane process + MVC / MVR evaporation + crystallization, flue evaporation, membrane distillation (MD) technology, etc. Taking a 2×600MW thermal power plant as an example, the waste water produced by the power plant is about 20 tons per hour. If the American horizontal film spray MVC evaporation / crystallization technology is used, the total investment is 60 million yuan, and the annual operating cost is about 12 million yuan. Wastewater treatment equipment has high investment and high operating costs, which increase the production cost of power companies. On the other hand, the current wastewater treatment equipmen...

AI Technical Summary

Problems solved by technology

Wastewater treatment equipment has high investment and high operating costs, which increases the production cost of power companies

On the other hand, the current wastewater treatment equipment has a high failure rate and a short service life. A set of membrane process + MVC / MVR evaporation equipment often faces the problem of replacing membrane components after less than 4 years of operation. The high cost makes most enterprises overwhelmed

The system is simple and practical, but there are problems: 1. The nozzle of the spray pipe is easy to scale and block; 2. It is easy to cause high-temperature salt corrosion on the heating surface of the slag outlet of the boiler; 3. The ability to treat wastewater is limited, and the problem of wet slag is serious

Since the waste water treatment process does not form a cycle process, only the waste water is sprayed to the hot slag through the spray pipe, it is impossible to achieve complete evaporation through the waste heat of the hot slag, resulting in high water content in the output slag, and the slag needs to be dehydrated. Wastewater reprocessing costs more

[0005] This technical solution obviously realizes that it is difficult to completely evaporate the waste water, so in order to realize the complete evaporation of the waste water entering the slag well, in this patent document, a compressed air unit is preferably arranged to atomize the waste water sprayed from the nozzle to the hot slag as much as possible, but Atomization will produce a large number of salt mist clouds carrying corrosive ions and droplets, resulting in high-temperature salt accumulation corrosion at the slag outlet of the boiler

Images