Seawater Evaporation Steam Power Generation Performance Evaluation

Nowadays,water pollution and water shortages have become huge problems that our country and even the world face.In industrial production,thermal power industry is a large water consumption,not only large amount of boiler make-up water,cooling water consumption greater.In order to reduce the cost of water,coastal city power plants have adopted desalination technology to produce fresh water and seawater as cooling water,thus saving the cost of water but increasing the anticorrosion investment in using cooling water in the cooling system and bringing huge seawater utilization The resulting pollution caused by concentrated seawater.Faced with the new situation of the current state environmental protection policies,it is urgent to solve the problem of concentrated seawater utilization while solving the problem of shortage of fresh water resources.Such as the use of direct evaporation of seawater generated steam power generation,waste heat after power generation for desalination,direct evaporation of concentrated seawater using the remaining heat decompression evaporation,vacuum evaporation of concentrated brine for salt chemical products,not only greatly reduced Investment and operating costs,but also to achieve full utilization of seawater,and eventually is expected to achieve zero emissions.It is expected that the reduction of electricity prices and water prices will be a major event concerning the national economy and the people's livelihood.Not only will there be enormous economic benefits,but also tremendous social benefits as well as great strategic significance.Due to the complex composition of the sea water,evaporation requirements can not be directly met.In this paper,seawater was pretreated by chemical precipitation and nanofiltration.Seawater desalination pretreated seawater was used to directly generate seawater.The boiling point of seawater caused by calcium and magnesium ions was investigated.The evaporator was continuously Run to determine the best operating conditions.At the same time,the morphology and composition of the pollutants were analyzed by scanning electron microscopy and energy spectrum analysis.By collecting the condensate produced from the steam,the conductivity and TDS of steam condensate were analyzed and determined to determine whether the turbine inlet requirements were met and the feasibility of generating electricity was met.Meanwhile,the concentrated brine after evaporation was investigated.The test results show that the seawater,calcium ion and magnesium ion can be completely removed after the hard treatment,which meets the water requirement of the evaporator;Simulated seawater with calcium ions and magnesium ions boils at up to 106.5 ? while the simulated seawater without calcium and magnesium has a boiling point of 104 ? and the use of extremely wasteful heat of calcium and magnesium ions;The best operating conditions of the evaporator were determined.The evaporation rate of seawater could reach 50%when the water inflow was 0.45m3/h,the influent temperature was 60 ? and the flue gas flow rate was 95m3/h.The output steam pressure was about 0.9 Mpa;the electric conductivity of the steam produced by the evaporator after scrubbing the steam tower is less than 1 ?s/cm,the steam quality meets the requirements of the steam turbine intake;After evaporation of concentrated seawater into the distillation column near the next concentration,TDS up to 200000mg/L,baume reached 23,Salt to meet the vacuum also required to achieve a seawater desalination,power generation,salt,the perfect combination of the three industries.