Power plant desulfurization slurry circulating pump running conveying medium characteristics

Slurry circulating water pump is one of very important equipment in power plant desulphurization system equipment, the main function is to absorb tower slurry unceasing circulation, make the sulfur dioxide in flue gas is absorbed completely.

desulfurization slurry circulating pump running conveying medium feature

slurry circulating pump is one of the vulnerable parts, mainly by serum acidic corrosion, wear and cavitation, the service life of the slurry circulating pump commonly 3 years, 1 year or so has to be replaced a new impeller.

      1. Strong abradability

desulfurization bottom slurry containing a large amount of solid particles, mainly is the fly ash, calcium sulfite ( Sweep CaS03 · 20) And calcium sulphate ( CaS04 · 2H20 ） , granularity of 0 ~ 400 mu m, more than 90% of 20 ~ 60 mu m, concentration of 5% ~ 28% ( These solid particles (mass ratio >, Especially Al203 and Si02 > strong abrasion resistance.

      2. Highly corrosive

in a typical limestone-gypsum desulphurization process, general bottom slurry pH value of 4 ~ 6 belongs to acidic environment; Cl ion concentration in the absorption tower more than 20000 mg/L, under the condition of low pH value will produce a strong corrosive.

      3. Cavitation sex

in the desulfurization system, the desulfurization of the slurry circulating pump slurry often contains a certain amount of gas. In fact, the centrifugal circulation pump slurry was for gas-solid multiphase flow fluid, solid and relative to the influence of pump performance is a continuous, uniform, and the influence of air relative pump is far more complicated than the solid phase and harder to predict. When the gas in the liquid pump pump flow, head, efficiency are decreased, the air content, the greater the efficiency decreases faster. With the increase of air content, the noise of the pump an additional vibration, which can lead to the destruction of the pump shaft, bearing and seal.

at the entrance to pump suction and the place such as blade on the back of the gathered will lead to gas flow resistance increase resistance and even flow, which in turn worsen conditions, necessary cavitation volume increase, the gas density is small, large volume, large compressibility, rheology, centrifugal force is small, energy conversion performance difference is the main cause of pump working condition deteriorated. The experimental results show that when the volume of fluid ( Volume ratio) Around 3%, the performance of the pump will be steep fall, when the inlet gas was 20% ~ 30%, the pump stop completely. Centrifugal pump allows air content ( Volume ratio) The limit is less than 5%.

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