烟气热干化工艺
利用锅炉烟气余热干化污泥,将污水处理厂经过一级脱水污泥,进行干化,直至满足末端处置需求为止(焚烧或填埋),干化设备为转鼓干化机,主要发源于日本和德国。
优点:利用锅炉烟气余热干化污泥,可以在不用消耗新能源的情况下,将污水处理厂污泥的含水率降低,使污泥干化过程中运行成本较低,开辟了一条废物循环利用,以废治废的有效途径
螺杆泵传动轴
烟气热干化工艺
利用锅炉烟气余热干化污泥,将污水处理厂经过一级脱水污泥,进行干化,直至满足末端处置需求为止(焚烧或填埋),干化设备为转鼓干化机,主要发源于日本和德国。
优点:利用锅炉烟气余热干化污泥,可以在不用消耗新能源的情况下,将污水处理厂污泥的含水率降低,使污泥干化过程中运行成本较低,开辟了一条废物循环利用,以废治废的有效途径。
缺点:对于污泥处理量较大的应用场合,烟气环保处理困难,须对大量烟气进行二次处理;安全性、经济性较差,系统设备庞大;受热源锅炉烟气的限制。
1、井下螺杆泵的工况,即井筒流体进入敞开腔室的流量大小与敞开腔室的压差和流体粘度等因素有关。1. The working conditi of the downhole screw pump, that is, the flow of the wellbore fluid into the open chamber, is related to the pressure difference of the open chamber and the viscosity of the fluid.A、压差对工况的影响The effect of A and pressure difference on the working condition如果忽略流体的蒸汽压力、井筒动液面和泵吸入口的摩阻损失,则打开一个敞开的腔室所建立的生产压差为0.1Mpa,只要在吸入口及腔室之间的压降小于形成一个腔室所建立的压差,井筒流体将全部充满腔室,则螺杆泵可以达到其理论摄排量。

B、流体粘度对工况的影响The effect of B and fluid viscosity on the working condition随着流体粘度的增加,由于产生较高的压降使泵的排量下降。As the viscosity of the fluid increases, the displacement of the pump decreases as a result of high pressure drop.C、泵磨损影响Effect of C and pump wear螺杆泵的工作转速通常为40至500r/min,为减少由于磨损而带来的维修工作量,应当随流体的磨蚀性增加而降低泵的转速。研究表明,泵的磨损与流体流速成正比,但是低的转速对井下泵的使用寿命又产生不利的影响。The working speed of the screw pump is usually 40 to 500r/min. In order to reduce the maintenance workload caused by wear, the speed of the pump should be reduced with the increase of the abrasive wear of the fluid. The study shows that the wear of the pump is proportional to the flow velocity of the fluid, but the low speed of the pump has a negative effect on the life of the downhole pump.

(作者: 来源:)