Research And Application For Updating Waste Water Discharging System In Wangqu Power Plant

As is known to all,lucid waters and lush mountains are invaluable assets.With the current severe environmental protection pressure,the zero discharge of waste water for the thermal power plant can be realized by updating the waste water discharging system.Firstly,it can be save water by improve the utilization rate of waste water.Then,the thermal power plant need to solve the environmental issues of the water discharging.Last,implement cascade use water,reuse water and recycle waste water by optimize the water balancing system.The remaining small amount of unrecycled waste water will be digested by mixing with dry ash and spraying the ash yard.It is effective method to recycle and utilize waste water by updating the waste water discharging system,the power plant could gain favorable social and environment achievements as well as economic benefits.Based on research results published both internationally and domestically,this paper provides two technical schemes for updating waste water discharging system of Wangqu Power Plant.The two schemes are analysis and comparison with each other.In addition,an engineering scheme is also provided and the economical efficiency of the scheme is appraised.This paper proposes to update the waste water discharging system by means of demineralizing the recycling water via membrane and raising the concentration ratio of circulating water.Two schemes are provided.In Scheme 1,the water is taken from the industrial waste water handling station and the outlet of circulating drainage,then the water is led into the circulating drainage recycling system to be treated,and the treated water will be reused in the cooling tower.In Scheme 2,water taken directly from the Zhangze Reservoir and the Reclaimed Water Station,and it used in the cooling tower after treated via high-tensity clarifying pool and through secondary softening.The core technique of these two schemes is demineralizaiton utilizing membrane technology.Scheme 1 is recommended because the smaller scale of demineralization and membrane treatment,lower construction costs,better operation environment for circulating water system and is more favorable to build a plant-wide water balancing system for zero discharge of waste water.The engineering scheme of updating the waste water discharging system combination the technologies of ozone-biological activated carbon+reverse osmosis for treating circulating water drainage.A coal sediment pool and coal-water separation device shall be new built for treating waste water that containing coal dust.Double membranes method which utilizes both reverse osmosis and positive osmosis shall be the main technique for treating desulfurization waste water.After the construction of the above mentioned engineering scheme,it is estimated that the power generation water consumption shall be reduced from the current 2.62 m~3/(MW·h)to 1.95 m~3/(MW·h),meeting the requirement for a conservation-oriented power plant.The water intake from the reservoir will be reduced by 3.83 million m~3 annually(696 m~3/h),and collect water fee saving 6.511 million yuan(5500 operating hours annual,1.7 yuan/m~3 for collect water fee).Water discharge will be reduced by 4.66 million m~3 annually(847 m~3/h),saving discharge fee 4.66 million yuan(1 yuan/m~3).The total fee saved shall be 11.171million yuan.