| This article is originated from the programme of research projects on the dust gray water system technological transformation of the NO.1 heating station in Xi'an in order to resolve the problem of the abnormal running of the NO.1 heating station in Xi'an. At the present time,ash pumping is used as the principle way of ash removal in the coal fired boilers,that it have the advantage of decreasing ash casting in the course of transportation and low cost,but then it crease water consumption ,bring about environmental pollution. In order to save the carrier water and decrease environmental pollution,many coal-fired boilers have installed the ash-water recycling system,which means the ash removal system adopted the condense slurry transportation and the recycling usage of the ash water. Whereas this recycling operation system would have the serious depositing in ash-water recycling system caused by the recycling use of the higher and higher pelleted ash-water ,which will influence the normal operation of the boiler system. For this the solution to the problem, the paper recycling water from the optimal design, coagulation precipitation and increased filtration devices in the three carried out a detailed study,finds out the method——coagulation.The coagulation experiment of ash-water is done to get the conclusion that Al2(SO4)3·18H2O is the best coagulant and the best quantity and the limits of pH is5.9～8.27 . Finally, the first company in Xi'an thermal heating station-house grey water recycling programme for the transformation of the design and calculation.
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