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Landfill Gas Migration Control System Design Application remedy - the old Shanghai, a mountain of garbage methane explosion works Humin


, Negative gas control method. Uptake in order to accelerate the release of methane gas in order to obtain more effective control of land in the high methane concentration, mandatory mechanical exhaust emissions to the positive control method can rapidly reduce the concentration of methane gas accumulation, reduction of methane gas in the garbage accumulated inside the mountain, so that the whole mountain of garbage methane concentration within the drop down quickly. The control method is to use centrifugal fans stuck by the gas pumping wells up garbage layer suction gas emissions to the atmosphere for dilution to achieve. In order to determine the required dump a number of exhaust pipes,[link widoczny dla zalogowanych], one or more reasonable to first of a series of pumping wells under different pumping test flow rates were determined from the associated well with the suction pressure head loss to gain Thus the area mountain of garbage at the gas pump to draw the number of wells. According to others, had this garbage in the compaction within 1.4m. / Min gas flow pumping up their sphere of influence to estimate the area of 49303m, the old mountain of garbage Humin only five gas pumping well enough. In the selection of fans, should take into account the pumping well used here and the recovery of methane gas is not the same, so do not worry too much air being sucked inside the landfill would interfere with and inhibit the process of anaerobic decomposition produces methane gas, therefore, flow can be used not only a large number of fans, motors, power can also be equipped with larger, faster speed, so that traction can be a greater static head, pipe and fittings used to overcome the resistance caused by the loss. 2.2.2.1 Structure of the gas pumping well consider a wind turbine pumping two gas pumping wells, for which traffic should use bigger, faster speed of the explosion-proof centrifugal fan, exhaust emissions to increase mandatory efficiency, the structure shown in Figure 3. Built-in wells do not wear a cap to vent the exhaust pipe,[link widoczny dla zalogowanych], with gravel backfill, compacted clay seal Inoue Department. Since the distance between the two wells is only 15m, and taking into account the convenience of gas sampling, it will surface through the ground between the two wells, pipelines and fans connected to form a suction exhaust venting system Shuangjing. Ground surface in the horizontal pipe laying, taking into account the excretion of condensate, in this design is the use of the pipe facing the air flow direction of tilt, the condensate pump discharge to wells, and then returned to the waste layer, so called The horizontal pipe is gravity pipe. But to do so, the air discharge of condensate acts as a It can be seen, pipeline corrosion problems and the fans have to consider. 2.2.2.2 pumping well points on the design of the exhaust vent Shuangjing the number of pumping systems as five. For distribution in the garbage mountain, it is desirable from 3 aspects: (1) focus in the higher concentration of methane gas block; (2) requires audience relatively uniform distribution; (3) not affect the landscape along the MTR. . Figure 3, composed of two pumping wells venting exhaust system 2.3 Comparison of the program and recommended the program to be compared from three aspects, that is technically advanced and economically reasonable and feasible conditions, from which the program will make recommendations . Due to the above two options are based on the analysis of proposed project site, which shows that the technical solution adopted is practical, simple, reliable, cost-effective solutions, the use of the vent exhaust pipe direct buried, eliminating the need for gravel backfill wells This also reduces the cost, so technically advanced, especially in the second scenario,[link widoczny dla zalogowanych], a positive force due to increased suction vent exhaust system, the program is technically considered more thoughtful than the first, explosion-proof measures more secure. Economically, the second program of the program increased over the first five Shuangjing venting exhaust pumping system, the investment also increased accordingly, and in return is more secure gas explosion control system, take This investment is reasonable. In the conditions, the two programs in the construction of the difficulty encountered is the same, this is the landfill field drilling. Drilling technology to eliminate the difficulties, this does not use any of the drilling method, but use a single bucket excavator, backhoe digging depth of their selection of 5m, so that the first shovel dug a pit depth required, it will exhaust tube inserted in the pit, while righting it, while excavators to dig out the trash and then cover the soil backfill and pipe, this method is simple, but also save time,[link widoczny dla zalogowanych], which resolves the difficulty of the construction of the drilling. As a mountain of garbage and old Humin New Longhua Subway Station nearby, frequent trains between the mountain and off along the way security is of paramount important, do this, these two designs, considering the selection of The second program is better, that is, buried in the garbage mountain range exhaust vent, choose a high methane concentration plots,[link widoczny dla zalogowanych], the taking of the positive mechanical exhaust emission control methods, to quickly lower the accumulation of methane concentration. (Continued)
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