80 results about "Off rate" patented technology

A method for determining formation pressure at a depth region of formations surrounding a borehole, including: keeping track of the time since cessation of drilling at the depth region; deriving formation permeability at the depth region; causing wellbore pressure to vary periodically in time and determining, at the depth region, the periodic and non-periodic component of pressure measured in the formations; determining, using the time, the periodic component and the permeability, the formation pressure diffusivity and transmissibility and an estimate of the size of the pressure build-up zone around the wellbore at the depth region; determining, using the time, the formation pressure diffusivity and transmissibility, and the non-periodic component, the leak-off rate of the mudcake at the depth region; determining, using the leak-off rate, the pressure gradient at the depth region; and extrapolating, using the pressure gradient and the size of the build-up zone, to determine the formation pressure.

A bidirectional buck-boost converter includes at least one soft-switching cell to reduce switching losses by providing soft-switching of all semiconductor devices. A soft-switching cell comprises an active switch coupled in series with an inductor, a two-winding transformer, and a reset-voltage circuit. The soft-switching cells enable the buck and boost rectifiers to turn off with a controlled turn-off rate of their current to minimize their reverse-recovery losses, the power-controlling buck and boost switch to turn on with zero-voltage switching (ZVS), and the switch of the soft-switching cell to turn off with zero-current switching (ZCS).

The invention relates to a replacing method of a converter tap hole and belongs to the technical field of steel smelting. The replacing method of the converter tap hole provided by the invention comprises the following steps: 1, placing a whole set of brick in a brick cup channel and adjusting the angle and position; and 2, fixing the whole set of brick on the converter body, filling the gap between the brick cup and whole set of brick with a tapping hole grouting material and sintering the tapping hole grouting material by the waste heat in the converter. The invention has the following beneficial effects of the replace time shortened by about 10 minutes compared with an existing method, the service life of the tapping hole prolonged by about 250 furnace compared with the existing method, the success rate for pushing off the slag improved by 10% compared with the existing method and the cost on per ton of steel reduced by about 0.15 yuan, so as to achieve the purposes of shortening replace time for converter tapping hole, prolonging the service life of tapping hole, improving slag pushing-off rate, reducing production mistake, improving product quality and reducing production cost.

The invention provides an industrial coal briquette which comprises the following components according to weight by parts: 90 to 98 parts of coal, 0.25 to 1.0 part of caking agent, 0.0025 to 0.01 part of cross linker, 1.5 to 8 parts of hot-setter and 0.25 to 0.65 part of waterproof agent. The preparation method of the coal briquette is simple, a small amount of caking agent is used, and applicability is strong; the prepared product has the advantages of high dry and wet strength, favorable water resistance, favorable thermal stability and the like, burn-off rate of coal briquette is high, and the content of fume pollutants is low.

The invention discloses a manufacturing method of an insulated gate bipolar transistor (IGBT). A backside technology comprises the following steps that N-iron implantation is performed on a back side of a silicon substrate so as to form an N-buffer; a solid mask plate is placed between the back side of the silicon substrate and a laser light source; a laser beam passes through the solid mask plate and carries out annealing on the N-buffer in a laser irradiation area so as to form a graphic structure which is formed by a high activation area and a low activation area; the laser beam reaches a position of the back side of the silicon substrate after passing through the solid mask plate and the position is changed so as to realize carrying out annealing on the N-buffers of different areas on the silicon substrate; finally, the annealing can be performed on the N-buffers of all the areas on the silicon substrate. By using the method of the invention, a space between the high activation area and the low activation area of the N-buffer can be accurately controlled; when a device is started, stable carrier distribution balance can be formed; when the device is started, diffuser efficiency of a collector region hole can be inhibited and a turn-off rate of the device is increased.

The invention relates to a production method of converter smelted low-sulphur steel. The production method comprises following steps: 1, molten iron KR stirring desulfurized lime powder, fluorite, and aluminium slag are mixed at a ratio of 10:1:1, wherein ladle slagging-off rate is controlled to be 90% or higher, and the S content of molten iron put into a furnace is controlled to be 0.003% or lower; 2, reactor washing after smelting of a former batch of non low sulphur steel and before smelting of a first batch of low-sulphur steel is carried out; 3, remaining slag and double slag operation is adopted in smelting of low-sulphur steel. According to the production method, reactor washing, remaining slag, and double slag treatment are combined for smelting in a converter, and reactor washing after smelting of a former batch of non low sulphur steel and before smelting of a first batch of low-sulphur steel is carried out, so that the sulphur introduced by remaining slag operation of the first batch of low-sulphur steel smelting is reduced, combination of remaining slag and double slag is beneficial for stable control of end point low sulphur content, converter end point sulphur content is controlled to be 0.005% or lower stably, the lowest sulphur content is 0.001%, technical guarantee is provided for development of low-sulphur novel steel; and at the same time, converter average smelting period is shortened by 4min or longer, converter operation efficiency is increased, and production capacity is increased.

The invention discloses a preparation method for pure natural sipping wine. The preparation method comprises the following steps: S1, raw material selecting: taking sorghum as raw materials; S2, raw material processing: adding water in the raw materials for soaking for 36-48 h, washing and changing water after soaking for 12 h, and the time number for washing and changing water is greater than or equal to 2; S3, boiling: putting the soaked and washed sorghum in boiling water to boil, getting sorghum out of water when the cracking-off rate of the sorghum is greater than or equal to 70%, and draining water for later use; S4, stewing: after steaming, stewing the drained sorghum for 50-70 min; S5, fermenting: cooling down the stewed sorghum, and adding bacillus mesentericus, wine yeasts and aroma yeasts for fermenting; S6, storing: after fermentation, storing in a dark room for more than 25 d to prepare the pure natural sipping wine. The preparation method is simple to operate, short in production cycle, convenient to prepare and easy to realize industrialized mass production by quantifying the fermentation technology; the sipping wine product prepared by adopting the preparation method is excellent in quality and pleasant and mellow in taste, and guarantees the most traditional flavor of the sipping wine.

The invention relates to an environment-friendly biomass fuel rod, comprising a fuel rod body having a circular cross section; the fuel rod body comprises a rod body, a bonding layer and a combustion-supporting layer which are sequentially connected from inside to outside; the rod body is a cylinder formed by carrying out extrusion molding on combustible waste powder; a through hole is formed in the middle of the cylinder; the through hole is formed along the length direction of the rod body; a plurality of lateral notches are formed in the combustion-supporting layer and are distributed in the fuel rod body in an inclined way; the fuel rod body is in a wave shape and comprises wave peak sections and wave trough sections; the lateral notches are positioned in the wave peak sections of the fuel rod body and abut against the outer side of the bonding layer, so that the fuel rod is easy to ignite when burning for the first time, the burning velocity and breathability of the interior of the biomass fuel rod are increased, the ignition temperature is reduced, and the contact area between the biomass fuel rod and oxygen is enlarged; the biomass fuel rod is easy to ignite, good in breathability and high in heat energy utilization rate, can realize rapid and clean combustion, and is good in combustion characteristics, high in burn-off rate and high in heat productivity.

The invention discloses a method for improving the boiler combustion economy of a tangential combustion anthracite coal boiler. The combustors of the coal-fired boiler comprise a main combustor and an upper tertiary air combustor, wherein the main combustor is positioned in a main combustion region in a coal-fired boiler body, and the upper tertiary air combustor is next to the upper part of the main combustion region. The method comprises the following steps: (1) adding a layer of tertiary air jet nozzle below secondary air of the lowermost layer of the main combustion region to serve as a lower tertiary air combustor; (2) forming openings in original tertiary air pipes on the four corners of the boiler, and guiding original tertiary air to the added tertiary air jet nozzle by an added pipeline so as to increase the burn-off rate of coal powder without influence of low-load stable combustion capability of the boiler. According to the method, the boiler efficiency can be improved by more than 3% on the basis of guaranteeing the stable combustion capability of the boiler; the efficiency of the anthracite coal boiler is greatly improved, and the combustion stability of the boiler cannot be influenced; by the method provided by the invention, the investment and the running expense are low and the national conditions of China are met.

The invention discloses biomass briquette with cornstalk as a base material. A sulfur-fixation combustion improver is added. By cooperation of components of the combustion improver, flue gas generated during the briquette combustion process is turned into coal gas, flame is increased, and emission of lots of fume and harmful gas is reduced. Meanwhile, biomass generated by fermentation is modified with a sodium hydroxide solution, lye releases -OH which enters lignin of biomass' cell walls to destroy pyranoid ring in lignin, separate cellulose and hemicellulose tangled in lignin and relieve a spatial three-dimensional cross-linked network structure of lignin and hemicelluloses. Through recombination, a complex spatial network structure is formed, and cohesiveness is raised, briquetting pressure is then reduced, and abrasion of equipment is relieved. The prepared biomass briquette has integrated advantages of low cost, low ignition point, high burn-off rate and waterproofness, and is of great significance for energy conservation and environmental protection.

The invention discloses a technological method for recycling germanium from corrosive liquid containing germanium and fluoride and relates to the technical field of hydrometallurgy, in particular to a technological method for recycling germanium from corrosive liquid containing germanium and fluoride through the methods of boric acid germanium precipitation for fluoride removal and fluoride removal through silicon dioxide. The technological method for recycling germanium from corrosive liquid containing germanium and fluoride is characterized in that boric acid and silicon dioxide are added at the same time, heating and volatilization are carried out, fluoride is removed, germanium is precipitated and enriched, and therefore germanium metal is recycled. According to the technological method, the fluoride removal rate can reach 78% or above, the fluoride content of slag containing germanium and residual liquid which are finally transferred into the chloridizing distillation step is smaller than 0.05%, the germanium slag grade obtained through precipitation can reach 25% or above, the germanium recycling rate before chloridizing distillation is carried out can reach 95% or above, the loss rate of germanium metal is smaller than 1.2% in the whole fluoride removal process, and some supernatant liquid waste obtained after fluoride removal is subjected to recycle recovery secondary germanium precipitation treatment. When chloridizing distillation is carried out on slag containing germanium and residual liquid, the germanium distil-off rate can reach 98% or above, and production technological requirements can be met.