36results about How to "Reduce water erosion" patented technology

A seadling growing bowl is prepared from pulverized straw and/or stalk and adhesive (polyacrylamide) in weight ratio of 100:(0.2-1). Its advantages are low cost, and no pollution.

The invention relates to a planting method for crops, in particular to a wide-row flat planting protective tillage planting method for maizes. The planting method comprises the following seven steps of: performing land preparation, sowing, rolling after sowing, weeding by pesticides, subsoiling mechanically and performing side deep fertilizing, preventing and controlling diseases and insect pestsand harvesting mechanically. In the planting method, the conventional 60-centimeter uniform ridge planting mode is changed into a flat planting mode of 80-centimeter row pitch and 20-centimeter row spacing, and ventilating and light-transmitting space of the crops is increased; the conventional shallow intertillage and shallow fertilization mode is changed into a mechanical deep scarification anddeep topdressing mode, namely the conventional three-shovel three-time intertillage management and shallow fertilization operation is changed into one-time deep scarification and deep topdressing operation, so operation links are reduced, and the production cost is reduced; the conventional sowing mode is changed into a zero-tillage sowing mode, so the evaporation of soil moisture is reduced, andthe capacity of drought resistance and soil moisture conservation is improved; the conventional mode that harvested low stubbles are crushed to return to a field into a mode that mechanically-harvested high stubbles are rotten naturally to return to the field; and before sowing, seeds are processed by using a plasma seed processing technology to improve the germination percentage of the seeds.

The invention discloses a dehumidifying device for a hollow stationary blade of a steam turbine through heating and blowing. A stationary blade at a moist steam stage of the steam turbine is processed into a hollow blade; a proper position on back arc or inner arc of the hollow stationary blade or an outlet of the stationary blade is provided with a blowing slit; a flow of high-pressure high-temperature steam from a high-pressure section of the steam turbine is introduced into the hollow stationary blade through a valve and a steam inlet pipe; the high-pressure high-temperature steam removes the water film flowing on the surface of the stationary blade under the double action of heating and blowing of the slit so as to reduce the number, diameter size and distribution of secondary water drops at the outlet of the stationary blade. The dehumidifying device of the invention can effectively prevent or relieve water erosion of a movable blade so as to improve the safe running performance of the steam turbine, and has a simple structure and good dehumidification effect.

The invention discloses a high-steep bare rock slope surface vegetation greening system and a construction method thereof. The system comprises a roughening layer, a transition combination layer, an artificial soil layer, a plant seed layer and a protection layer which are sequentially arranged from bottom to top. By close attachment and combination of the toughening layer, the transition combination layer, the artificial soil layer and the protection layer, a complete vegetation greening system is formed, supply of water and nutrients of a nutrient layer and a plant growth layer suitable fordevelopment of plant root systems is established, so that rock surfaces are firm, the life of the high-steep bare rock slope surface vegetation greening system is prolonged, after several years, plantroot systems are firmly and densely anchored in all layers, and dual functions of greening and slope protection are realized; the problem about the life of the vegetation greening system is solved, rare rock surfaces and artificial soil are combined into a whole by pervious concrete intermediates, slipping of the artificial soil layer from the vegetation greening layer is prevented, and the service life of the vegetation greening system is greatly prolonged.

The invention relates to a steam turbine stator with a serpentine channel and a steam turbine stator heating and dehumidifying device. The steam turbine stator with the serpentine channel mainly comprises a hollow stator body. At least three partition walls are arranged in the hollow stator body and arranged at intervals in the forward direction and the backward direction along the stator top to the stator root inside the hollow stator body. The tail ends of the partition walls and the inner wall of the stator root or the inner wall of the stator top are arranged at intervals, and a ventilation port is reserved. The serpentine channel used for conduction of air currents is formed in the hollow stator body. The hollow stator body is provided with an air inlet and an air outlet. High temperature steam is guided in from the air inlet, passes strokes of the serpentine channel in sequence and then is guided out of the air outlet. The serpentine channel which is provided with fins used for increasing roughness of an internal air current passageway is designed in the stator to enhance heat exchange, and thus the optimal dehumidifying effect can be achieved by guiding in the least heat.

The invention discloses a corn straw total crop straw return protective farming method. A corn harvester with the straw crushing and returning function is adopted for harvesting during the autumn harvest in first year, meanwhile, the crushed corn straws are uniformly thrown into the field, and the ground surface is covered; ploughing and soil preparation operation is carried out; stubble ploughing, straw cutting and mix burying, subsoiling, soil preparation, compacting and the like are completed at one time; in the spring period in the second year, direct seeding is carried out, multiple worksuch as fertilization, precision seeding, soil covering, compacting and the like can be completed at one time; a nitrogen fertilizer is applied between the seedlings by a topdressing machine during the growth period of the corns. According to the method, the straw cutting segments are uniformly mixed in the soil of the tilling layer, so that the ground temperature can be improved, the straw rotting is accelerated, the diseases and pests are reduced, and meanwhile a certain surface straw coverage rate can be guaranteed, wind erosion and water erosion are reduced, and the purpose of protecting the soil is achieved, the method is especially suitable for being applied and popularized in regions with low winter and spring temperature in the northeast, and a technical support is provided for large-area popularization and protection of the regions.

The invention relates to the field of bridge protection, and aims to provide a protection device for a building bridge. The protection device comprises a pier base buffering mechanism arranged at a pier base of a foundation pier and a pier body buffering mechanism arranged on a pier body of the foundation pier located on the water surface; the pier body buffering mechanism comprises a buffering cylinder fixed to the pier body in a sleeving mode; the buffering cylinder comprises an upper fixing ring, a lower fixing ring and force unloading rollers, wherein the upper fixing ring and the lower fixing ring are fixed to the pier body, and the force unloading rollers are arranged outside the portion, between the upper fixing ring and the lower fixing ring, of the pier body; the multiple layers of force unloading rollers are arranged from inside to outside, and a plurality of overflowing holes are evenly distributed in the force unloading rollers; and the upper ends and the lower ends of the force unloading rollers are connected with the upper fixing ring and the lower fixing ring to form rotating fit. According to the protection device, buffering of water flow to the pier body can be effectively relieved, the water erosion effect is reduced, the pier body of the foundation pier is prevented from being damaged by water erosion, and the safety of the foundation pier and the whole bridge is improved.

The invention discloses a no-tillage water replenishing sowing method based on a condition of total straw coverage. In areas of rainfall below 450 mm and in areas of aeolian sandy soil or severe areasof wind erosion, the method includes the following specific steps: after corn enters a stage of complete ripeness, a large-scale corn harvester is employed for harvesting, and corn stalk is simultaneously pulverized and uniformly spread on the earth surface; during suitable sowing time from the last ten days of April to the first ten days of May of the following spring, straw covering the earth surface of sowing rows is cleaned out a sowing zone with the width of 40 cm to reach a to-be-sowed state; sowing, water replenishing, fertilizer application, and pressing are completed once on a cleaned sowing zone by employing a no-tillage water replenishing sowing machine; and after seedlings emerge, a herbicide is sprayed for weeding; and when the corn has 3-4 expansion leaves, soil under corn seedlings is loosened. Compared with the prior art, high-quality sowing can be achieved under the condition that the straw totally covers and is returned to the field, a sufficient water source is provided for seed germination according to a soil moisture state, the quality of a group seedling stage is ensured, and the usage amount of the herbicide is reduced.

The invention provides a steam turbine low-pressure final-stage temperature field prediction method and device, and the method comprises the steps: carrying out the screening of obtained historical operation state parameters of a steam turbine, and obtaining a historical operation state parameter sample set and a target parameter temperature field data set; training the historical operation stateparameter sample data set and the target parameter temperature field data set by using a K nearest neighbor algorithm to obtain neighbor sample parameters; and generating a turbine low-pressure final-stage temperature field prediction value corresponding to the current running state parameter according to the obtained current running state parameter of the turbine and the neighbor sample parameter. According to the steam turbine low-pressure final-stage temperature field prediction method and device, the steam turbine low-pressure final-stage temperature field prediction value can be generatedaccording to the current operation state parameters of the steam turbine low-pressure cylinder so that the water spraying amount in the low-pressure cylinder can be reasonably adjusted subsequently,and water erosion to final-stage blades caused by water spraying can be reduced.

The invention discloses a corn planting method. After corn is harvested each time, the corn is aired in the sunning ground which comprises an inverted-Y-shaped canopy frame formed by erecting bamboo poles. The longitudinal section of the inverted-Y-shaped canopy frame is in a triangle shape, the distance from the top end of the triangle to the bottom edge is 3.5 m, the bottom edge is 6 m long, and the bottom of the inverted-Y-shaped canopy frame is square and is 6 m wide. In the bottom, the length of the edge adjacent to the bottom edge is in direct proportion to the planting area of corn and is arranged to be 5m/hm<2>. The top and the periphery of the inverted-Y-shaped canopy frame are fixedly covered by thin films with the thickness being 8*10<-5>-15*10<-5> m. The closed sunning ground is arranged, the greenhouse function of the sunning ground greatly reduces the number of corn which mildews, rots and goes bad due to plum rains, loss of corn harvested each time is reduced, and the yield of corn is increased.

The invention discloses an ultra-high-pressure 200 MW low-pressure cylinder zero-output flexible transformed steam turbine, and belongs to the technical field of steam turbines. The ultra-high-pressure 200 MW low-pressure cylinder zero-output flexible transformed steam turbine aims to solve the problems of dynamic stress risk, blast risk and water erosion risk caused by low-pressure cylinder zero-output flexible peak adjustment transformation. The steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a low-pressure cooling steam system, a heating and steam extraction system and a low-pressure cylinder water spraying system, wherein a medium-and-low-pressure communicating pipe is arranged between the medium-pressure cylinder and the low-pressure cylinder, a heating and steam extraction connecting port, a low-pressure cylinder cooling steam outlet, a butterfly valve and a low-pressure cylinder cooling steam inlet are sequentially arranged on the medium-and-low-pressure communicating pipe in the steam outlet direction, a steam inlet of the low-pressure cooling steam system is connected to the low-pressure cylinder cooling steam outlet, a steam outlet of the low-pressure cooling steam system is connected to the low-pressure cylinder cooling steam inlet, a steam inlet of the heating and steam extraction system is connected to the heating and steam extraction connecting port, and the low-pressure cylinder water spraying system is used for carrying out water spraying and temperature reduction on a last-stage movable blade of the low-pressure cylinder. The ultra-high-pressure 200 MW low-pressure cylinder zero-output flexible transformed steam turbine is mainly used for the field of steam turbine transformation.

The invention discloses a water erosion reducing highly-sealed centrifugal sand pump. The sand pump comprises a pump shell, a motor shaft, an outer magnetic rotor, an isolation sleeve, an inner magnetic rotor, a transmission shaft, an impeller, an end cover, a feeding port, a discharging port and a flow slowing mechanism; the feeding port is formed in the center of the end cover, and the discharging port is formed in the side edge of the end cover; and the flow slowing mechanism is arranged on the feeding port, and the flow slowing mechanism comprises a flow slowing shell, a flow slowing groove, a flow slowing stop block and a flow slowing spring, wherein the flow slowing shell is fixedly arranged on the feeding port, the flow slowing groove is formed in the flow slowing shell, the flow slowing spring is fixedly arranged in the flow slowing groove, and the flow slowing stop block is arranged at one end of the flow slowing spring. According to the sand pump, on one hand, a buffering structure is adopted for the inner wall of a device, so that the pressure of fluid on the device is reduced, the damage to the device is reduced, and the service life of the device is long; and on the other hand, the pressure near a feeding pipe is increased, so that the cavitation problem is solved, the working quality of the device is improved, the device is not prone to being damaged, and the service life is long.

The invention discloses an electrical automation instrument protection device which comprises a supporting plate, a box body is fixedly arranged on the supporting plate, damping devices are symmetrically and fixedly arranged on the upper inner wall and the lower inner wall of the box body, each damping device comprises a first fixing plate, a first spring and a second fixing plate, and the first fixing plates are installed on the upper inner wall and the lower inner wall of the box body. The two first springs are fixedly arranged on the side, away from the inner wall of the box body, of the first fixing plate, the second fixing plates are fixedly arranged at the ends of the sides, away from the first fixing plate, of the first springs, and first semi-annular plates are fixedly arranged atthe two ends of the first fixing plate. The device has the advantages that the vibration amplitude of the annular protective frame is reduced, the vibration amplitude of a flow meter is reduced, the reading accuracy of the meter is improved, the service life of the meter is prolonged, and the effects of damping and protecting the flow meter are achieved.