51results about How to "Reduce flood risk" patented technology

The invention discloses a reservoir group flood control storage capacity distribution method based on the maximum system nonlinear safety degree. The method comprises the following steps: according to the nonlinear safety degree of a single reservoir and the nonlinear safety degree of a reservoir group flood control system, with the over standard flood volume of a reservoir group joint flood control station to be minimum and the nonlinear safety degree of the reservoir group flood control system to be maximum as targets, a reservoir group flood control storage capacity optimal distribution model based on the maximum system nonlinear safety degree is built; a linear programming method is adopted to solve the built reservoir group flood control storage capacity optimal distribution model; and according to the solved calculation result, an optical distribution scheme for the flood control storage capacity for each reservoir in the reservoir group during each scheduling time period is obtained. According to the reservoir group flood control storage capacity distribution method provided by the invention, through optimizing the reservoir group flood control storage capacity distribution, while the overall flood control benefits of the reservoir group are improved, the flood control risks of the reservoir can be reduced effectively.

A stripper (S N ) for carbamate decomposition and ammonia plus carbon dioxide recovery from a urea solution (U) is realized with a shell-and-tube heat exchanger, where a liquid falling film of urea solution and a counter-current gaseous flow of a stripping medium fed to a bundle of surface-heated tubes (6); the stripping medium such as carbon dioxide is distributed into the tubes (6) by a plurality of gas risers (32); the gas risers are preferably associated to a perforated tray (30) in the bottom chamber (11) of the stripper. Revamping of a conventional CO 2 stripper is also disclosed.

The present invention discloses a reservoir group flood control capacity distribution method based on a maximal variable-weight remaining flood control capacity. According to the technical scheme of the invention, serial cascade reservoirs are adopted as equivalent reservoirs and the parameters of the equivalent reservoirs are determined. The weight of the remaining flood control capacity of each reservoir in a serial cascade reservoir group is calculated. According to the weight of the remaining flood control capacity of the serial cascade reservoirs, the weight of the remaining flood control capacity of each reservoir of all equivalent reservoirs is calculated. After that, a reservoir group flood control capacity optimization distribution model based on a maximal variable-weight remaining flood control capacity is established. The model is solved and a flood control capacity optimization distribution scheme is obtained. According to the technical scheme of the invention, the influence of flood characteristics on the reservoir group flood control capacity optimization distribution is fully considered. According to the reservoir inflow, the flood control capacity and the flood routing process, the weight of the remaining flood control capacity of each reservoir is determined, wherein the weight is varying along with different scheduling periods. The influence of subjective factors during the weight setting process of the conventional method can be avoided. The distribution scheme of the reservoir group flood control capacity is optimized and the overall effect of improving the flood control effect in a reservoir drainage basin is realized. The flood control risk of the reservoir is effectively reduced.

The invention provides a fuel cell bipolar plate and a manufacturing method thereof, including a bipolar plate main body; the bipolar plate main body is provided with a reserved area for a conductive plate, a flow channel area, an air inlet hole and an air outlet hole; A staggered distribution of sub-channels is added inside, which provides an additional discharge path for liquid water, enhances the drainage capacity of the channel, reduces the risk of flooding of the porous electrode, strengthens the mass transfer of reactants, and improves the fuel cell at medium and high current densities. performance under operating conditions. At the same time, the optimized distribution of gas is realized, the effective concentration of oxygen in the electrode is increased, and the performance of the battery is optimized. The invention utilizes 3D printing technology to make fuel cell bipolar plates, which makes up for the deficiency that the traditional processing technology cannot meet the manufacturing requirements of complex structure flow channels, and has short processing time, low cost and high precision, which helps to broaden the scope of fuel cell flow field design. Direction of development.