41results about How to "Reduced diffusion loss" patented technology

The invention discloses a number concentration measurement device of atmospheric ultrafine particles. The number concentration measurement device comprises an atmospheric airflow channel, a sample gas flow channel, a shell gas flow channel, a gas inlet device, a saturated solution device, a condensing device and an optical detection device. According to the number concentration measurement device, on the basis of a condensation nucleus theory and a light scattering measurement theory, i.e. shell gas flow passes through steam of a heated saturated solution and then is mixed with the air flow of the atmospheric ultrafine particles, the ultrafine particles pass through the condensing device and then are condensed to grow up, and then a light scattering technique is used for measuring the particles which are condensed to grow up, so as to obtain a number concentration value of the particles. By using the shell gas flow designed in the number concentration measurement device, the loss of sample gas flow particles can be reduced, and the condensation nucleus efficiency of the ultrafine particles can be effectively improved. The number concentration measurement device has the advantages of small and compact structure and high applicability, and the number concentration of the particles with a particle diameter range between 3 nm to 5 microns can be measured.

The invention discloses a wind prevention, sand fixation and water retention afforestation method and belongs to the technical field of environmental protection engineering. The method comprises steps as follows: a curing agent is prepared from sodium carboxymethylcellulose, anionic polyacrylamide, ferrous chloride and water; the curing agent and sand are blended to form cured sand; deep holes for tree planting and shallow trenches for grass planting are dug in the sand land, water collecting hoppers are drilled in the deep holes, the deep holes and the shallow trenches are filled with the cured sand, and the cured sand form deep hole sand fixation and water absorption layers in the deep holes and form shallow trench sand fixation and water absorption layers in the shallow trenches; saplings are planted in the deep holes, the roots of the saplings extend into the mouth parts of the water collecting hoppers, and grass seeds are scattered in the deep holes and the shallow trenches; the grass seeds are covered with a mulching film for maintenance, and small ventilation holes are formed in the mulching film. The curing agent and the sand soil are blended, inside gaps of soil particles can be filled with the blended curing agent and sand soil, the cured sand particles don't easily disperse and jump, sufficient water can be continuously provided for plants, and the long-time wind prevention, sand fixation and water retention effects are achieved.

The invention discloses a pulse backflush deashing device for a filter. Filtering units are arranged on a pipe plate of the filter, and the pipe plate divides the filter into a clean gas cavity and a dusty gas cavity in a sealing manner. The pulse backflush deashing device comprises ejectors arranged at the upper parts of the filtering units, and backflush pipelines matched with the ejectors, wherein one end of each backflush pipeline is communicated with a backflush gas storage tank through a pulse backflush valve, and a direction-adjusting multi-hole jet nozzle according to the top part of each ejector is arranged at the other end of each backflush pipeline. As the pulse backflush deashing device adopts the direction-adjusting multi-hole jet nozzles with the jet directions being adjustable, the jet direction of backflush gas can be adjusted, the jet length can be extended, and a primary jet flow and a secondary jet flow are mixed uniformly by multiple high speed jet flows, so that the distribution statuses of backflush gas flows entering the ejectors can be improved, the diffusion loss is reduced, the energy transmission efficiency can be improved, and the deficiencies, such as non-uniformity of pulse backflush, as well as gas flow eccentricity and filter pipe vibration that are brought by the existing jet nozzles, are overcome.

The invention relates to an air-breathing pulsed plasma thruster which comprises an air collection device, a flow adjusting device, an air inlet passage, a storage tank, an air inlet spray pipe, an anode, a cathode, a discharge chamber housing, a spark plug, a power system and an energy-storage capacitor. High-speed air enters the air collection device, and enters the storage tank through a flow adjusting valve, so that the disturbance of the high-speed air is reduced; before the air enters a discharge passage, air flow is adjusted; the energy-storage capacitor is charged by the power system,so that a high voltage is formed between the anode and the cathode, inflow air enters a discharge passage through the air inlet spray pipe, and charged particles are generated through the ignition ofthe spark plug to enable the electrodes to be conducted to discharge; and under the jointed effect of the magnetic field formed in a loop current and an electric field formed between the electrodes, aplasma generates electro-magnetic acceleration and is sprayed out from the discharge cavity housing, so that a thrust is generated.

The invention provides a pulse back blowing dedusting device and a gas ejector and filtering device thereof.The gas ejector adopted by the pulse back blowing dedusting device and the filtering device comprises an ejector body.The ejector body comprises an inlet portion, a neck portion and a bow portion which are connected in sequence.The heights of the longitudinal sections of the inlet portion, the neck portion and the bow portion are sequentially decreased and then increased, and the gas ejector is transversely arranged relative to a filter pipe of the filtering device.By improving the shape of the gas ejector and the arrangement mode of the pulse back blowing dedusting device, the filter pipe corresponding to the gas ejector can achieve uniform back blowing, the flow distribution condition of gas blown into the gas ejector is improved, and uniform and thorough dedusting can be performed on the filter pipe.In this way, on the one hand, back blowing dedusting pressure can be lowered, vibration of the filter pipe is reduced, and thermal shock and fatigue crack risks are lowered; on the other hand, dust layer bridging between filter pipes can be avoided, and the phenomenon that filter pipes lose efficacy is avoided.

The invention discloses an ionic migration spectrometer. The ionic migration spectrometer comprises an upper annular electrode, a lower annular electrode, a central electrode, a detection electrode and a shielding grid, wherein the upper annular electrode and the lower annular electrode are arranged oppositely and concentrically in the vertical direction, the central electrode is located in the circle center of the upper annular electrode, an ion source area is formed among the central electrode, the upper annular electrode and the lower annular electrode, and an ion drifting area is formed among the detection electrode, the upper annular electrode and the lower annular electrode. The detection electrode comprises a lateral part of a set cylinder, the shielding grid is a conductor and is located between the ion drifting area and the detection electrode, and the shielding grid is provided with voltage lower than the voltage of the central electrode when the voltage of the central electrode is higher than the voltage of the detection electrode and provided with voltage higher than the voltage of the central electrode when the voltage of the central electrode is lower than the voltage of the detection electrode. The ionic migration spectrometer has higher accuracy and higher sensitivity.

The invention discloses a finned u-shaped solar collector tube, which mainly comprises a u-shaped copper tube, a sail-shaped fin, a single-sealing cover, a transparent heat preservation tube, a reflective diaphragm and the like. Due to the adoption of a vacuum sealing heat preservation measure combining the single-sealing cover and the single-layer transparent heat preservation tube, the finned u-shaped solar collector tube realizes the heat collection scheme of directly taking the fin of the u-shaped copper tube as a solar irradiation surface, changes heat collection and heat transfer ways adopted in the prior art, cancels redundant low-efficiency intermediate heat transfer links, simplifies a structure, directly transfers radiation energy collected by the fin into a heat transfer medium in the u-shaped copper tube, remarkably reduces the surface temperature of the irradiation surface, improves a heat transfer rate and heat efficiency, enables a plurality of technical measures such as the sail-shaped fin, a heat absorption channel, reflective heat-aggregation, a matt black body and the like capable of increasing an effective heat collection area and improving the heat collection efficiency to be applied to achieve the technical effects of radiant absorptance alpha of 96 percent, the heat efficiency improved by about 40 percent and reduction in the cost, has the characteristics of rational structural design, reduction in the cost, improved heat efficiency and the like, and the advantages of low heat diffusion loss, high heat transfer rate, reliability, simple process and the like, and is convenient to arrange and easy to produce in large scale.

The invention provides a pulse back-blow dedusting device and a gas injector thereof, and a filter device. The gas injector used by the pulse back-blow dedusting device and the filter device includes an injector body, and the injector body includes an entrance part, a neck part, and an arch part connected with each other in order. The widths of the entrance part, neck part, and arch part in the longitudinal section are increased at first then decreased, and the heights of the entrance part, neck part, and arch part in the longitudinal section are gradually decreased. The gas injector is horizontally arranged relative to filter pipes of the filter device. The filter pipes corresponding with gas injector are back blown uniformly by means of improving the shape of gas injector and installation mode of the gas injector in the pulse back-blow dedusting device, and the filter pipes are dedusted uniformly and thoroughly by means of improving the air flow distribution blowing the gas injector. The back-blow dedusting pressure is reduced, the shock of the filter pipes is reduced, the risks of the thermal shock and fatigue break are reduced, the dust layer bridging between the filter pipes is avoided, and the invalidation of the filter pipes is avoided.

The invention discloses a sandy soil greening construction method, and belongs to the environment protection engineering technical field; the method comprises the following steps: preparing a curing agent; mixing the curing agent with sandy soil so as to form curing sand; digging deep pits and shallow trenches in the sandy soil, drilling water funnels into the deep pits, filling the curing sand into the deep pits and shallow trenches, planting saplings into the deep pits, allowing sapling roots to extend to the water funnel mouths, and spreading grass seeds in the deep pits and shallow trenches; laying fine sands on the grass seeds, using a mulch film to cover the grass seeds, opening vents on the mulch film, inserting wooden slots around the mulch film, and pouring slurry into the slots so as to form a water fence; watering the grass seeds for maintenance, and irrigating in every 1-2 days until the grass seeds germinate. The method mixes the curing agent with the sandy soil so as to fill inner gaps of the soil particles; the curing sand particles cannot easily disperse and jump, thus contentiously providing sufficient water for plants, and realizing long term windproof, sand solidification, water retention and greening effects.

The invention provides a spiral volute of a centrifugal fan. The volute is in the minimum width at the position of a volute tongue, and the width thereof is gradually increased along the flowing direction and, at a certain angle, is equal to the width of an opening of the volute. The radius of the profile of the volute is increased near the volute tongue, i.e. the radial height of the volute is increased. Through the arrangement that a spiral volute structure is formed by changing heights of the volute, because of the increased radial height, an air flow at the opening of the volute is not prone to impacting the wall face of the volute in the radial direction; because the width of the volute is decreased near the volute tongue, the degree of diffusion in the width direction of the air flowwhich enters from an impeller into the volute is decreased; and therefore, diffusion loss and impact loss are reduced and the original status is recovered. The spiral volute of the centrifugal fan isbeneficial to improving efficiency of the centrifugal fan.

The invention provides a pulse back-blow dedusting device and a gas injector thereof, and a filter device. The gas injector used by the pulse back-blow dedusting device and the filter device includes an injector body, and the injector body includes an entrance part, a neck part, and an inclined part connected with each other in order. The heights of the entrance part, neck part, and inclined part in the longitudinal section are gradually decreased, and the gas injector is horizontally arranged relative to filter pipes of the filter device. The back-blow airflow does not concentrate in the central position by means of improving the shape of gas injector and installation mode of the gas injector in the pulse back-blow dedusting device, and the filter pipes corresponding with gas injector are back blown uniformly, so that the filter pipes are dedusted uniformly and thoroughly. The back-blow dedusting pressure is reduced, the influence of back-blow gas on the thermal shock and shock of the filter pipes is reduced, and the usage life of the filter pipes is prolonged.

The invention discloses a plate type high-field asymmetric waveform ion mobility spectrometer. The ion mobility spectrometer comprises an ion source, a migration region and a detection region, whereinthe migration region comprises an electrode pair composed of an upper electrode and a lower electrode, one electrode is a grid-type plate electrode, and the other electrode is a metal plate electrode. Asymmetric waveform voltage is applied to the electrode pair, and an asymmetric waveform electric field which is non-uniformly distributed in space can be generated in the migration region. Under the electric field, specific ions generate a movement trend towards the central plane of the migration region in the migration region, i.e., ion focusing in the migration region is generated. The diffusion loss of the ions in the migration region is reduced due to ion focusing in the migration region, so that the passing efficiency of the ions in the migration region is improved. According to the ion mobility spectrometer, the sensitivity of the instrument can be improved, and under the same condition, the signal intensity measured by the ion mobility spectrometer is remarkably improved comparedwith the signal intensity of an existing plate type asymmetric waveform ion mobility spectrometer.