Thermal power plant reclaimed water supervision treatment method

Abstract

The invention belongs to the technical field of water quality treatment, and particularly relates to a thermal power plant reclaimed water supervision treatment method which comprises the following steps: S1, detecting Cl1, NTU1 and COD1 of reclaimed water; S2, adding a coagulant and lime for reaction; S3, adding a sterilizing agent; S4, detecting NTU2, Cl2, TOCi1 and COD2 of effluent of a mechanical acceleration clarification tank; S5, adding a sodium hypochlorite bactericide, and detecting NTU3, Cl3 and TOCi2 of effluent of a variable-porosity sand filter; S6, detecting the pressure difference between an inlet and an outlet of ultrafiltration equipment and NTU4, DD1 and Cl4 in the effluent of the ultrafiltration equipment; S7, detecting DD2 and TOCi3 of the effluent of a reverse osmosis device; S8, obtaining TOCi4 and DD3 of effluent of a secondary desalting equipment; S9, taking the effluent of the secondary desalting equipment as second-stage desalted water which is used for industrial production of a power plant; S10, recycling the wastewater in the reclaimed water treatment process; and S11, transmitting all detection data to a chemical operation DCS (Distributed Control System) in real time. The reclaimed water treatment system is monitored in real time, and corresponding adjustment can be carried out when the quality of reclaimed water changes.

Description

technical field [0001] The invention belongs to the technical field of water quality treatment, in particular to a method for supervising and treating reclaimed water in thermal power plants. Background technique [0002] As a large industrial water user, thermal power plants account for about 8% of my country's total industrial water consumption. With the deterioration of water resources and water environment problems, the state promulgated the "Water Ten Measures" and other policies to strictly limit the water consumption of power plants, and vigorously promote industrial water conservation and reuse of reclaimed water in power plants. With the gradual improvement of urban sewage treatment effects and the expansion of sewage treatment facilities, most power plants can obtain a stable source of reclaimed water. Therefore, reusing reclaimed water for thermal power plants has received widespread attention and application around the world. The reuse of reclaimed water in powe...

AI Technical Summary

Problems solved by technology

[0003] The research and application of reclaimed water as the supply water source for thermal power plants started relatively late in China. Therefore, more and more thermal power plants, especially new power plants or new construction projects of power plants, start to use reclaimed water. At the same time, the transformation of old power plants is also imperative. The content of suspended solids, nutrient salts, metal ions, organic matter and microorganisms is higher than that of groundwater and surface water. Due to the large fluctuation of reclaimed water quality, after the water source of the power plant is switched to reclaimed water, the water treatment system of the power plant cannot track the progress in real time. Timely adjustments to the water quality have resulted in problems such as coagulant penetration, mechanically accelerated clarifier overturning, ultrafiltration membrane scaling, reverse osmosis security filter fouling, and desalinated water being polluted by organic matter. In order to solve the problems caused by changes, a set of early warning and supervision methods for reclaimed water treatment was invented to adjust the water treatment system in time, and early warning of poor reclaimed water quality, timely replacement of backup water sources and other measures to prevent the deterioration of the water treatment system. , causing the water vapor quality of the unit to be abnormal, affecting the safe and stable operation of the thermal power plant unit

Images