How to solve the cooling tower circulating water temperature is too high

Circulating water temperature of steam turbine: the influence of the cooling tower circulating water temperature have important effects on vacuum degree of the unit, steam turbine unit run run relative to the winter in the summer, significantly lower power generation efficiency, and the temperature of the cooling tower circulating water in the summer to reduce this is closely associated. Circulating water temperature, so the condenser vacuum, exhaust temperature and exhaust pressure, available enthalpy drop decreases, and the unit economy, at the same time reduce the output of generating unit. High exhaust pressure, exhaust cylinder and bearing heat expansion, may cause offset center, make the low closing seal friction, easily cause vibration. And exhaust temperature is too high may cause within the condenser cooling water pipe is flabby, destroy the rigor, make steam turbine axial thrust increases. Lower the exhaust volume flow of vacuum degree is reduced, against a few stage blade at the end of the work, produce flow and vortex, at the same time also in a certain parts of the blade to produce larger vibration force, shorten the service life of the last stage blade, exhaust reaches 90 degrees, Wilson phenomenon can occur, namely a few stage blade at the end of the low stress fracture, cause an accident. Negative pressure and low temperature cooling tower: depth of negative pressure cooling tower in our country's invent products, product performance is superior to the national standard requirements, both at home and abroad for the first time DaChu of cooling water temperature is lower than the wet bulb temperature of the environment. Depth of negative pressure type cooling tower technology source such a theory: 'to speed up the evaporation of water and the strength, must increase the kinetic energy of water evaporation, the kinetic energy should be negative pressure, it reduce the attractive forces between water molecules, water vaporization is accelerated, after vaporization of water molecules, fast away from the water surface. Water increases the negative pressure in the cooling process after kinetic energy, make water cooling speed, at the same time to overcome environmental conditions because of the humidity in the air for cooling after the influence of water temperature. When cooling water temperature is lower than the ambient air temperature, heat transfer water in the air, when the air is cooled, the water molecules in the air content is constant, the water's run forward by negative pressure kinetic energy, water rapid evaporation at the surface, and increase the humidity in the air, because air cooling water temperature drops, wet air temperature also fell, the volume of water also follow up the change, so the absolute humidity will change too. Falling water evaporation, water temperature, air cooling again unceasingly, the running forms it could reduce the cooling water temperature and change the key role of humidity in the air. This product USES the original working principle of the cooling tower, the wind as the lower water temperature kinetic energy, and added a negative pressure kinetic energy, make the cooling water temperature is lower than the local, the wet bulb temperature. Advantages of negative pressure cooling tower: in the waste heat power generation system, cooling water temperature is lower, the more heat away from the condenser cooling water. According to measure, the water temperature drop 5 ℃, condenser vacuum can increase about 1%, and the water temperature is lower the further reduce the cooling surface of the unit of scale, increase the condenser vacuum. According to estimation, small and medium-sized steam turbine condenser vacuum every 1% increase, the unit efficiency can be increased by 1%. In a 6000 kW unit, run 7000 h meter a year, more than a year generating 420000 kW h, save BiaoMei 210 t.

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