589results about How to "Reduce gas content" patented technology

A liquid chromatographic system is provided including catalytically combining hydrogen and oxygen gases in the chromatography eluent stream in a catalytic gas elimination chamber, to form water and thereby reduce the gas content in the eluent stream. Also, a liquid ion chromatographic system in which the effluent from the detector is recycled to a membrane suppressor and then is mixed with a source of eluent for recycle to the chromatographic column.

The invention relates to a coal seam pre-splitting method based on gas extraction, which adopts a 'CO2 gas extraction device' as a tool to blast and pre-split a pre-mined coal seam, so as to increase the crack of the coal seam, drive out gas absorbed on the coal seam and extract the gas. The method particularly comprises the following steps: drilling a hole on the working surface of a pre-mined coal seam, filling CO2 gas extraction device into the drilled hole, sealing the drilled hole, detonating the CO2 gas extraction device, releasing high-pressure CO2 gas for deep-hole impact and pre-splitting of the coal seam, taking out the CO2 gas extraction device, and connecting the drilled hole with a gas extraction system to extract gas. The pre-splitting method of the invention can greatly enhance the permeability of the coal seam, promote the gas dissociation in the coal seam, and improve the underground gas extraction efficiency of the coal mine.

A remotely pressure-releasing method for sucking and exhausting gas from the low-air-permeability high-gas soft and thick coal seam is disclosed. The coal seam, which is 70m under the coal seam to be gas-exhausted and has relative interbeam distance of 30-70 times, is first mined. Under the action of pressure release and subsidence, the cracks are generated in the coal seam and the gas penetrates through the cracks and then is exhausted via predrilled holes. After the coal seam is mined, a great deal of gas is flowing along the seam and then is sucked by said predrilled holes.

A production method for the blank of large cold-rolling high-Cr steel roller includes smelting in arc furnace, refining outside the furnace, conveying hot steel ingot, heating in high-temp homogenizing mode, drawing by V-shaped stock, upsetting twice, and post treating. Its advantages are short productive period and low cost.

The invention provides a martensite precipitation hardening stainless steel for structural member and a manufacturing method thereof. The martensite precipitation hardening stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.05 percent of C, 13.50 to 15.50 percent of Cr, 2.5 to 4.0 percent of Cu, 3.0 to 5.0 percent of Ni, 0.15 to 0.40 percent of Nb and Ta, 0.010 to 0.040 percent of N, 0.050 to 0.15 percent of V, less than or equal to 0.80 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities. The stainless steel is smelted by combining an electric furnace, AOD refining and vacuum self-consuming technology, so the stainless steel has the characteristics of high strength, good plasticity, good corrosion resistance and the like, and can meet the requirements of high-strength components such as high-pressure values, oil drill, efficient heavy-duty machinery and the like on material performance.

The invention discloses a high-flowability polymide composite which comprises the following components in parts by weight: 100 parts of thermoplasticity polymide, 0.5-10 parts of polybutylene, 15-70 parts of reinforcing material, 10-30 parts of fire retardant and 3-10 parts of other additives, wherein the melting point of the thermoplasticity polymide is 280-330 DEG C, and the relative viscosity of the thermoplasticity polymide is 2.0-2.3. The polymide composite provided by the invention has the advantages of high flowability and good mechanical processing property, and can meet thin wall and multi-cave forming requirements; the content of the gas in the obtained composite is less, the surface of the formed product is good, and raw materials can be obtained easily and are low in price; and the high-flowability polymide composite has a wide market space.

The invention relates to a large-thickness lamellar tearing-resistant modulated high-strength steel plate with 960 MPa-level yield strength and a production method thereof. The chemical components ofthe large-thickness lamellar tearing-resistant modulated high-strength steel plate with 960 MPa-level yield strength comprises, by weight, 0.15-0.20% of carbon, 0.10-0.40% of silicon, 0.90-1.30% of manganese, 0.010-0.040% of niobium, 0.010-0.045% of vanadium, smaller than or equal to 0.010% of titanium, 0.03-0.06% of aluminum, 0.50-1.00% of nickel, smaller than or equal to 0.1% of copper, 0.30-0.80% of chromium, 0.20-0.70% of molybdenum, 0.001-0.005% of boron, 0.001-0.005% of calcium, smaller than or equal to 0.010% of phosphorus, smaller than or equal to 0.002% of sulphur, smaller than or equal to 0.002% of oxygen, smaller than or equal to 0.004% of nitrogen, smaller than or equal to 0.00015% of hydrogen and the balance iron and inevitable impurity elements. The technological steps of thesteel plate comprises smelting, secondary refining, vacuum degassing, calcium treatment, continuous casting, heating, rolling, steel plate slow cooling, quenching and tempering. The large-thickness lamellar tearing-resistant modulated high-strength steel plate with 960 MPa-level yield strength has high comprehensive mechanical property; the yield strength is greater than or equal to 960 MPa; thetensile strength is greater than or equal to 1000 MPa; the Charpy impact power at a low temperature of minus 40 DEG C is greater than or equal to 30J; the Z-direction tensile fracture surface shrinking rate is greater than or equal to 35%; and the lamellar tearing-resistant property is good.

The invention discloses a petroleum casing pipe with sulfurated hydrogen stress corrosion resistance and a producing method thereof, which aims to proceed from improvement on purity and tensile ratio of steel, tempered martensite proportion, grain refinement, remained stress reduction and other aspects, and provide the petroleum casing pipe with high obdurability and sulfurated hydrogen stress corrosion resistance and the production method thereof. The petroleum casing pipe comprises the following compositions in weight percentage: 0.12 to 0.18 percent of C, 0.10 to 0.60 percent of Si, 0.05 to 1.0 percent of Mn, 0.20 to 1.0 percent of Cr, 0.10 to 0.80 percent of Mo, 0.005 to 0.05 percent of Al, 0.005 to 0.02 percent of Ti, 0.05 to 0.15 percent of V, 0.002 to 0.02 percent of Nb, 0.0003 to 0.005 percent of Ca, 0.0003 to 0.005 percent of Mg, 0.0003 to 0.003 percent of B, less than or equal to 0.020 percent of P, less than or equal to 0.005 percent of N, and the balance being Fe, wherein the weight percentages of carbon, manganese, chromium and molybdenum are determined by a comprehensive control formula, that is A is equal to the sum of percentage of C, percentage of Mn divided by 5, percentage of Cr divided by 5, and percentage of Mo divided by 3, and the range of A is between 0.45 and 0.60 percent.

This is a gas extraction method for a single burst coal bed of stable coal occurrence, angle less than 10o, and firm index over 0.5. Drill a hole from top working face downward along the coal bed from shallow bed to deep, from low gas concentration zone to high for pre-extraction to lower down the gas concentration.

The invention discloses a preparation method for a high-quality 40Cr alloy structural steel hot rolled coil rod. The preparation method comprises the following steps of A, hot metal pretreatment desulfurization, B, molten steel smelting, C, deoxygenation alloying, D, molten steel LF furnace refining, E, molten steel VD furnace vacuum refining, F, molten steel casting, G, billet heating, and H, controlled rolling and controlled cooling. The high-quality 40Cr alloy structural steel hot rolled coil rod produced through the method is high in steel cleanliness and fewer in occluded foreign substance and has high-strength as well as excellent plastic toughness and cold heading machining deformation capacity, the production requirement of a high-level fastener is met, and steel gas content and the occluded foreign are greatly reduced.

The production method of S and Al contained continuous casting alloy steel adopts four-step technological process: (1). smelting steel by using D.C. electric furnace; at the time of tapping (1640-1660 deg.C) adding proper quantity of SiAlFe deoxidant, carbon powder, alloy and slag material; (2) refining by using LF furnace, (a). adding lime (CaO is greater than or equal to 90%), SiFe and C powderin batches, making white slag and bottom blowing argon; (b). for boron-containing steel feeding Ti and retaining B, (c). top slag alkalinity is 2.8, Al2O3 content in the slag is 25%, regulating Al and S; (3) vacuum furnace treatment, its vacuum degree is less than or equal to 140 Pa, and treatment time is 20 min.; and (4) continuous pouring, its pouring speed is 320 kg/min.

The invention discloses a process and a device for refining oil by dry distillation of oil shale. The process is characterized in that methane generated in the dry distillation process of the oil shale can be repeated used as a hot carrier in the dry distillation of the oil shale. The retort for realizing the dry distillation oil refining process is characterized in that: the retort has a vertical round-square structure, namely the cross section of the upper part is round, the cross section of the lower part is square, and the inside diameters of the upper and lower parts are the same; and array umbrellas, a herringbone baffle plate, a device shaped like a Ding(ancient cooking vessel of China) or in an Asi structure, an air distribution and material distribution tracery wall, a coke discharging tank, a cooling water jacket, a water seal pool, a coke pushing machine and a scraper conveyor are arranged in the retort from top down in turn. The daily handling capacity of the retort is 500 to 1,000 tons. The invention is suitable for refining oil by dry distillation of oil shale with low methane content, low solid carbon content, low water content and a particle size of 5 to 75 milliliters, and the recovery rate of the oil is 85 to 90 percent.

The invention relates to a compound extrusion preparation method of a large-diameter high-quality tube blank or an annular blank. The compound extrusion preparation method is mainly aimed at materials which are large in deformation resistance, narrow in heat processing temperature range, difficult in heat processing, and difficult to deform. The compound extrusion preparation method comprises the following steps: (1) a high-quality ingot blank with high purity is prepared through a vacuum melting process; (2) homogenization treatment is carried out alternatively, multi-pass pier drawing fast forging cogging-down is carried out, an organization is refined, and the homogeneity of the organization is improved; (3) hollow blank material is prefabricated in a punch mode; (4) isothermality/heat molding compound extrusion is carried out on the prefabricated hollow blank material, the tube blank with the uniform and thin organization is prepared; and (5) subsequent machining is carried out, and a finished tube (ring) and the high-quality ingot blank are obtained. The novel preparation method is used for preparing the large-diameter tube (ring) blank with the uniform and thin organization. The preparation method is labor-saving in shaping, energy-saving, high in material utilization rate, high in product quality, and capable of resolving the problems that a tube (ring) blank prepared through a traditional process is thick in organization, poor in uniformity, large in shaping force and the like.

The invention discloses an abrasion-proof and corrosion-resistant nickel-based alloy wire and a preparation method thereof. The alloy wire comprises the following components: 17-21% of C, 20-25% of Co, 1.8-2.2% of W, 6.4-9.5% of Mo, 1.4-1.8% of Al, 3.2-4.5% of Ti, 0.1-0.5% of Nb, 0.1-0.5% of Hf, 1.2-1.8% of Ta, 0.03-0.06% of Re, 0.01-0.05% of Ce, 0.02-0.1% of C, 0.005-0.015% of B, 0.02-0.07% of Zr, 0.005-0.008% of Mg, and the balance Ni. The preparation technology of the alloy comprises the steps of vacuum smelting, remelting, forging, hot rolling, drawing, solid solution treatment and aging treatment, namely, raw materials are prepared and smelted based on mass percent and then smelted; the smelted materials are forged and rolled into obtain alloyed wire rods; the alloyed wire rods are drawn at a plurality of times to obtain phi 0.05-0.4mm alloy wires; finally the alloy wires are subjected to solid solution treatment and aging treatment. The abrasion-proof and corrosion-resistant nickel-based alloy wire can be used as a brush wire material for brush sealing of an aircraft engine, a gas turbine, etc., thus the brush sealing effect can be effectively improved, and the service life can be prolonged.

The invention discloses a presintering treatment process of a glass batch and a device thereof, and the process is performed according to the following steps: (1) adding 0.5 wt%-3 wt% of binders and 6 wt%-8 wt% of water into a glass batch, well mixing, pressing into spherical particle materials with a diameter of 3-25 mm; (2) adding the spherical particle materials into a rotary heating furnace, preheating at 1020-1250 DEG C for 0.5-2 hours, adding the sintered densified spherical particle materials into a glass melting furnace from the rotary heating furnace. According to the invention, the decomposition of carbonates in the glass batch is performed outside the glass melting furnace, which greatly reduces the gas content in the glass batch, effectively increases the heat transfer, shortens the time for glass clarification and homogenization, that is, increases the single-line yield and reduces the energy consumption without the enlargement of the glass melting furnace area; the invention can realize the increase of the melting amount by 20%-30% without the enlargement of a current melting furnace scale.

The invention relates to an electroslag smelting casting method of fixed blades of a water turbine. Consumable electrodes are prepared by adopting a voltaic arc furnace refining method and the fixed blades are prepared by adopting an electroslag smelting casting process through a mould. The chemical components of the consumable electrodes are controlled as follows: C is 0.14-0.19 percent, Si is less than or equal to 0.6 percent, Mn is 1.5-1.9 percent, P is less than or equal to 0.035 percent, S is less than or equal to 0.035 percent, V is 0.02-0.15 percent, Nb is 0.015-0.06 percent, Ti is 0.15-0.25 percent, Al is more than or equal to 0.015 percent, O is less than or equal to 0.0040 percent, N is less than or equal to 0.0080 percent, H is less than or equal to 0.00035 percent, and the balance is Fe. The electroslag smelting casting system and the electroslag guide are controlled as follows: CaF2 is 60-80 percent, Al2O3 is 40-20 percent, or less MgO and CaO (the total is less than or equal to 20 percent); and the electroslag amount is usually 1.5-5 percent of the weight of a casting. The invention has less amount of oxide and sulfide, small size, even distribution, clean casting base body, high cooling speed, large crystallization temperature gradient at the front of solid and fluid, compact casting texture, high size precision and little distortion, and can greatly improve the product property of the refined casting.

The invention discloses a system and a method for exploitation of mixed-gas coal-bed methane exploitation in a drainage roadway in an oil well, and relates to a coal-bed methane exploitation technology. The exploitation method comprises the following procedures: 1.various gases are integrated into a mixed gas; the mixed gas comprises a or a plurality of strongly exchanged gases, which comprises H2S, SO2 and CO2; the mixed gas also comprises a or a plurality of weakly exchanged gases, which comprises N2, H2 and He; 2. the mixed gas is injected into a coal bed (5) through an injection hole (1) with high pressure; 3. gas comprising the coal-bed methane is obtained from an drainage hole (6) with a drainage device, until the methane content is lower than the economic exploitation content and safety content. The invention promotes the exploitation rate and unit output of the coal-bed methane, and produces quite an obvious effect in reducing the greenhouse gas emission. Meanwhile, the invention is provided with the effect of reducing the outstanding risks of gas, and is applicable in the low-penetration exploitable coal-bed methane exploitation field.

The invention discloses a preparing craft of low-micro carbon chromium iron alloy, which comprises the following steps: 1) loading high carbon chromium iron into medium-frequency induction furnace; melting; heating-up at above 1600 deg.c; pouring into tank; 2) transferring the tank to station; air refining; 3) taking-up oxygen gun; inserting argon oxygen gun into solution liquid level 300-400mm of tank; setting the discharge of oxygen at 300-500 L/min; blowing at 5 min with argon oxygen ratio at 1 : 3; blowing at 5 min with argon oxygen ratio at 1 : 2; blowing at 5 min with argon oxygen ratio at 1 : 1; adding into silicon iron; 4) transferring the tank into vacuum chamber; switching in argon oxygen pipe at the bottom of tank; blowing into argon oxygen mixed gas; controlling the discharge capacity of argon gas at 150-250 L/min, discharge capacity of oxygen at 40-80 L/min, vacuum degree at 5-200Pa and time of air refining at 20-30 min; 5) relieving the vacuum; hanging the tank to casting position; casting; getting the product. The good effect of this invention is: simple producing craft; high productive efficiency; low power; good environment; low cost.

The invention discloses a horizontal-drilling staged-fracturing pressure relief method for an underground coal bed. The method mainly comprises the steps of drilling a main horizontal hole which is 500m-1000m in length through a drill on a working face of the underground coal bed; placing an oil casing pipe into the main horizontal hole, cementing a well by G-level cement, placing a single-bending screw after cement curing, and drilling 8-10 branch drill holes which are 100-200m in length on the main horizontal hole; cleaning the drill holes thoroughly, installing a high-pressure hole sealing device at the opening of the main horizontal hole, connecting a high-pressure pump injection device through a high-pressure line, feeding a polymer gel liquid containing a natural quartz sand proppant into the hole, pumping the high pressure to open the coal bed in which a seepage channel with a flowing capacity is formed; and installing a water ring vacuum pump at the opening of the main horizontal hole, and pumping out gas in the main horizontal hole and branch drill holes. According to the method, a crack with the maximum volume can be formed in the working face of the coal bed, the permeability of the coal bed can be improved to the greatest extent, so that partings of the coal bed can be communicated so as to form a crack loose belt at a certain scale, the stress focused in the coal bed can be released, risks of rock burst of the coal bed and the content of gas in the coal bed are reduced, and safety production is guaranteed.