CN103335916A - Experiment device for initial laws of tectonic coal gas desorption - Google Patents
Experiment device for initial laws of tectonic coal gas desorption Download PDFInfo
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Abstract
The invention discloses a experiment device for initial laws of tectonic coal gas desorption. A high-purity gas steel cylinder is connected with a port of a three-way valve through a stop valve. A port of the three-way valve is connected with a port of a four-way valve through the stop valve. The four-way valve is connected with the stop valve, a vacuum gauge, a vavuum pump, a large-size measuring cylinder and a pressure gage. The three-way valve is connected with the four-way valve through the stop valve directly. The pressure gage is connected with a coal sample tank. The coal sample tank is arranged in a constant-temperature water-bath device. The bottom of the coal sample tank is connected with the constant-temperature water-bath device. A port of the four-way valve is connected with a gas mass flow meter through a spherical valve. One end of the gas mass flow meter is connected with a computer, and the other end of the gas mass flow meter is connected with a desorption instrument. Through the combination of a sensor and a computer, rapid acquisition of gas desorption speed data is achieved. The gas desorption instrument can measure the gas desorption amount synchronously, so that the reaction time of experiment data acquisition is shortened and the data acquisition precision is raised. The experiment device is advantaged by less error and large data acquisition amount.
Description
Technical field
The invention belongs to the firedamp testing technical field, relate in particular to a kind of structure coal desorption of mash gas initial stage rule experimental provision.
Background technology
The structure coal is the product that brittle crush or ductile deformation and rheology migration take place under tectonization in the coal seam, is the outstanding sign of forecasting coal and gas.Low-intensity, the height of structure coal adsorbs, diffuses with the hyposmosis characteristic soon is the basic reason that causes coal and gas to give prominence to, the gas ability of diffusing of especially constructing the coal desorption of mash gas initial stage has direct influence for coal and the outstanding generation of gas, development, is determining the critical conditions that coal and gas are outstanding.Structure coal gas fast desorption ability also is that coal seam gas-bearing capacity is measured inaccurate major reason, has had a strong impact on the implementation result of the prediction of outburst danger district and outburst prevention measures.
Control mainly is based upon on the basis of measuring coal seam gas-bearing capacity and gas pressure to the mine gas hazard prediction now, the fire damp piezometry is wasted time and energy, influenced greatly by geology, coal seam and field condition, it is lower to measure success ratio, therefore uses in engineering to be restricted.Gas bearing capacity is measured and is widely used, according to present coal seam gas-bearing capacity assay method (main desorption method, content determination, the down-hole desorption method etc. indirectly surveyed), gas bearing capacity is surveyed remaining quantity three parts by loss amount, down-hole site desorption amount, laboratory and is formed with having.Down-hole site desorption amount and laboratory are surveyed remaining quantity and are measured the standard that has formed standard, and error is less relatively.For the gas loss amount, often drawn by down-hole counter the pushing away of site desorption rule, the desorption of mash gas feature difference of coal body, thereby error is bigger.Especially error is obvious for the structure coal, has data to show that 30%～80% of gas in the coal was desorbed in the initial stage that coal body exposes.
Assay method and main thought to the desorption of mash gas rule are to utilize adsorption theory, adsorption equilibrium gas are utilized the method for depressurization desorption under steady temperature, pressure, measure certain moment desorption quantity and time relationship and make the isothermal desorption curve.Main method has boring coal core desorption method, gas to diffuse method, absorption-desorption experimental method, desorb numerical model method, the said determination method is difficult to accurately measure gas bearing capacity, because the complicacy of desorption of mash gas process and the rapidity of desorption of mash gas velocity attenuation, how to determine the desorption of mash gas time and accurately be determined at coal body to expose that the desorption of mash gas value is the common issue with that faces in the initial stage coal.
At present, research to desorption of mash gas initial stage rule in the coal, mainly concentrate on drilling cuttings in the correction of the desorb rule on ground, fewer at the research of structure coal desorption of mash gas initial stage rule, exactly this part constructs the key that the coal gas bearing capacity is measured and loss amount calculates just.Index parameter to gas desorb in early stage feature mainly contains Δ p, Δ h2 and K1 value now.These parameter characterizations at a time put the size of desorption of mash gas amount, be static concept.To characterizing coal body initial stage desorption ability directive significance is arranged, but little for gas compensating for loss and damage calculating effect.In addition, the structure coal to hole and cranny development of above-mentioned parameter may not be suitable for, expose early stage because construct the unusual main coal body that concentrates on of the desorption of mash gas of coal, early stage, the desorption of mash gas changing features was violent, so above-mentioned parameter is also inapplicable for the coal that some has the higher amount of diffusing.
The research for structure coal desorption of mash gas initial stage rule more is to carry out theoretic deduction in the assay method of research desorption of mash gas rule at present, improve gas bearing capacity prediction accuracy and reliability, two approach are arranged, the one, develop more reliable gas bearing capacity sensing equipment, comprise gas bearing capacity sensing equipment and coal seam pressurize coring equipment, this method also needs a large amount of element tasks to do at present, and fund and fundamental research are successful keys; The 2nd, improve gas loss amount computing method, this is cost-effective method at present.
The key of improving gas loss amount computing method is that structure coal gas loss amount calculates.Will accurately measure the structure coal desorption of mash gas embryonic character time that need respond and lack in the laboratory, the image data amount is big, the experimental provision that reliability is high.Measure the desorption of mash gas experimental provision at present and can be divided into two classes, the one, gravimetric method, the 2nd, container method.The gravimetric method experimental precision is higher, and is less but device bears pressure, and desorption of mash gas is measured under the incompatibility high pressure, and gravimetric method employing coal sample is less, can not reflect desorption of mash gas intrinsic propesties in the coal.The container method is widely used now, but also on the low side and experimental repeatability is relatively poor but test the coal sample amount.For big quality coal sample, require the reaction time short, the data acquisition amount is big, and the precision height can bear the desorption of mash gas experiment under the elevated pressures.Based on above-mentioned requirements, consider structure coal specific physical character, designed the experimental provision of a cover mensuration gas initial stage desorb feature, this device has been realized automatic collection and the record of desorption of mash gas data, improve the accuracy of measuring greatly, can reflect the dynamic process at desorption of mash gas initial stage accurately.
Summary of the invention
In order to grasp the Changing Pattern that the structure coal exposes initial stage desorption of mash gas speed and desorption quantity, and then the influence factor of analysis structure coal desorption of mash gas embryonic character, make up structure coal desorption of mash gas initial stage rule mathematical model, improve the accuracy that structure coal gas bearing capacity is measured, the invention provides a cover structure coal desorption of mash gas initial stage rule experimental provision.
The embodiment of the invention is to realize like this, a kind of structure coal desorption of mash gas initial stage rule experimental provision, high-purity gas steel cylinder of this experimental provision is connected to an interface of T-valve through stop valve, an interface process stop valve of T-valve is connected to an interface of four-way valve, and interface of T-valve is directly connected to four-way valve by stop valve; An interface of four-way valve directly connects stop valve, an interface of four-way valve is connected to vacuum meter through stop valve, an interface of four-way valve is connected to vacuum pump through stop valve, and an interface of four-way valve is connected to graduated cylinder by stop valve, and an interface of four-way valve is connected to tensimeter; Tensimeter is connected to the coal sample jar, and the coal sample jar places constant temperature water bath apparatus, and the bottom of coal sample jar is connected with constant temperature water bath apparatus, an interface of four-way valve, be connected to mass-flow gas meter through spherical valve, mass-flow gas meter one end is connected on the computing machine, and the other end is connected on the desorption instrument.
Further, described coal sample jar is the coal sample jar that stainless steel material processes, tank body wall thickness 10cm, and the tank body volume is about 150cm
3, tank interior exports and is designed to 10mm with the sealing of high pressure packing ring, tank body top installation stop valve and precision pressure gauge, stop valve.
Further, described experimental provision also is equipped with the desorb graduated cylinder, and high 100cm, diameter are 31cm, and gas volume is 60L.
Further, described constant temperature water bath apparatus shell adopts sheet metal, and its control box is directly installed on the water tank; Described constant temperature water bath apparatus is provided with two of turnover water nozzles, adopts water pump as circulation power in the water tank.
Device provided by the invention is compared with traditional desorption of mash gas platform, at characteristics such as desorption of mash gas initial stage speed height, desorption quantity change greatly in the coal under the high pressure adsorption equilibrium state, the rate of decay is fast, utilizing sensor and computing machine to unite realization desorption of mash gas speed data gathers fast, utilize the desorption of mash gas instrument to measure the desorption of mash gas amount synchronously, this device has improved reaction time and data acquisition precision that experimental data is gathered greatly, and it is little to have error, the characteristics that the data acquisition amount is big.
Description of drawings
Fig. 1 is the structure coal desorption of mash gas initial stage rule experimental provision that the embodiment of the invention provides, the structural representation of this experimental provision.
Among the figure: 1, high-purity gas steel cylinder, 2, vacuum meter, 3, vacuum pump, 4, constant temperature water bath apparatus, 5, the large size graduated cylinder, 6, mass-flow gas meter, 7, desorption instrument, 8, computing machine, 9, the coal sample jar, 10, tensimeter, 11, four-way valve, 12, T-valve, 13, stop valve, 14, spherical valve.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
The structure coal desorption of mash gas Experimental equipment that Fig. 1 provides for the embodiment of the invention.Only show part related to the present invention for convenience of explanation.
High-purity gas steel cylinder 1 is connected to an interface of T-valve 12 through stop valve 13, an interface of T-valve 12 is connected to an interface of four-way valve 11 through stop valve 13, an interface of four-way valve 11 directly connects four-way valve 13, an interface of four-way valve 11 is connected to vacuum meter 2 through stop valve 13, an interface of four-way valve 11 is connected to vacuum pump 3 through stop valve simultaneously, an interface of T-valve 12 is directly connected to four-way valve 11 by stop valve 13, an interface of four-way valve 11 is connected to large size graduated cylinder 5 by stop valve 13, the another one interface of four-way valve 11 is connected to tensimeter 10, tensimeter 10 is connected to coal sample jar 9, coal sample jar 9 places constant temperature water bath apparatus, the bottom of coal sample jar 9 is connected with constant temperature water bath apparatus 4, an interface of four-way valve 11, be connected to mass-flow gas meter 6 through spherical valve 14, mass-flow gas meter 6 one ends are connected on the computing machine 8, and the other end is connected on the desorption instrument 7.
This experimental provision is studied the desorption of mash gas initial stage rule of constructing coal by the environmental parameter (mainly being the gas pressure of adsorption equilibrium) that changes structure coal desorption of mash gas and the physical property (mainly being metamorphic grade, destructiveness, granularity etc.) of testing coal sample itself, analyze the major influence factors of structure coal desorption of mash gas rule, set up metamorphic grade, granularity, destructiveness, coal particle shape shape to the influence relation of coal grain gas initial stage desorb rule, propose more scientific and reasonable structure coal desorption of mash gas loss amount computing method according to structure coal desorption of mash gas initial stage rule.
This experimental provision comprises that mainly absorption-desorption unit, temperature control unit, vacuum suction unit, high-pressure aerated unit, gas diffuse the velocity determination unit and forms.
(1) absorption-desorption unit: mainly comprise gas absorption subelement and two parts of desorption of mash gas subelement.
Gas absorption subelement: formed by coal sample jar, precision pressure gauge, UNICOM's pipeline.The coal sample jar is that stainless steel material customized processes, tank body wall thickness 10cm, and design tank body volume is about 150cm
3, designing withstand voltage 10MPa, tank interior exports and is designed to 10mm with the sealing of high pressure packing ring, tank body top installation stop valve and precision pressure gauge, stop valve.The YB-150ZT precision pressure gauge that precision pressure gauge adopts Chinese Red Flag Instrument Co., Ltd. to produce, range 0～16MPa, precision is 0.25 grade, minimum scale is 0.1MPa.
The desorption of mash gas subelement: the desorption tube and the desorb graduated cylinder that mainly contain the band graduated scale are formed.The high 100cm of desorb graduated cylinder, diameter are 31cm, and gas volume is 60L; The desorb buret is divided into two kinds according to the range difference, and a kind of is its internal diameter 100mm, and high 500mm, range are 1000ml, and scale is 4ml; Another is internal diameter 50mm, and high 500mm, range are 500ml, and scale is 2ml.Stop valve, the switching glass threeway between the different range burets are used in the switching of big graduated cylinder and buret.When experiment, use the accuracy of buret to guarantee to measure of different ranges according to different needs.
(2) temperature control unit: major equipment is the high precision constant temperature water bath apparatus.Constant temperature water bath apparatus adopts the HH-601 type, and technical parameter is: the constant temperature fluctuation :≤0.1 degree heating power 1000w; Temperature range: room temperature+5 ℃-95 ℃; Water pump flow velocity: 〉=4L/min power 40w; Inner bag size mm:400X300X180.Its characteristics are exactly even water temperature, and temperature is accurate, and fluctuating temperature is little, and the water-bath shell adopts sheet metal, and control box is directly installed on the water tank.There are two of turnover water nozzles on the next door, adopts water pump as circulation power in the water tank, can keep water temperature constant, makes the temperature-controlled precision of instrument and the uniformity coefficient of water can both reach the experimental design requirement.
(3) vacuum suction unit: this unit mainly comprises vacuum pump and vacuum meter composition.
Vacuum pump: the 2XZ-1 type rotary-vane vaccum pump that experiment adopts Shanghai Vaccum Pump Factory to produce, this pump are that closed container is extracted the basic equipment that gas obtains vacuum, have little, the lightweight characteristics of volume, are particularly suitable for exact instrument and laboratory and use.Its technical parameter is as being: the speed of exhaust: 1L/s; End vacuum: 6.7 * 10-2Pa; Rotating speed: 1400 commentaries on classics/min; Power of motor: 0.25kw; Operating voltage: 220V; Air intake opening diameter: 15mm.
Vacuum meter: mainly use south, Sichuan light resistance vacuum meter ZDZ-52 type, concrete technical parameter is: measurement range: 1.0 * 105～1.0 * 10-1Pa; Range of control: 1.0 * 105～1.0 * 10-1Pa; Control accuracy: ± 1%; Load: AC220V/3A noninductive load; Response time :≤1s.
(4) high-pressure aerated unit: it is 99.9% that this unit mainly contains the concentration that inflation unit produced by the general gas companies of Beijing helium, and pressure is that 13MPa high-purity methane gas and inflation connecting line are formed.
(5) gas diffuses the velocity determination unit: mainly finish the mensuration that coal grain methane gas diffuses initial velocity, the reading automatically of data, collection and record have been realized in this unit, be 1S writing time, can get 60 data and precision in 1 minute and improve greatly, this unit is made up of mass-flow gas meter and area of computer aided data acquisition software.Mass-flow gas meter adopts D-600MD numeric type mass flowmeter, and concrete parameter is: the flow specification is selected for use: 5SLM; Accuracy: ± 1%F.S; Linear: ± 0.5%F.S; Repeatable accuracy: ± 0.2%F.S; Response time :≤1Sec; Operting differential pressure scope: (0.05-0.3) MPa; Maximum withstand voltage: 10MPa; Operating ambient temperature: 5-65 ℃; Be electrically connected: 8 pins; Input/output signal Digital:RS232/RS485.The CASE(Computer Aided Software Engineering) collection mainly realizes the real time data acquisition preservation.
(6) other utility appliance.Mainly comprise drying box, connecting line, stopwatch, valve etc.
Drying box: the DHG-9030A type air dry oven that adopts Shanghai exact instrument incorporated company to produce, basic parameter is: temperature control scope: RT+10-200 ℃/RT+10-250 ℃; Constant temperature fluctuation degree: ± 1 ℃; Temperature resolution: 0.1 ℃.
UNICOM's pipeline adopts weldless steel tube, thickness of pipe 2mm, and diameter 10mm connects.
Valve mainly comprises stop valve, spherical valve etc.But stop valve good airproof performance modulability is poor, and spherical valve adopts rotary opening and closing, and valve and pipeline form straight-through runner during unlatching, therefore the gas loss minimum by valve can have been reduced the influence of valve to desorption of mash gas speed greatly.
Experimental provision of the present invention has been realized following function:
(1) vacuum outgas function
This function mainly contains the vacuum outgas unit and finishes, can finish whole device before the experiment vacuum outgas and system pipeline, coal sample jar, is connected the gas demarcation in space in valve, the tensimeter.
(2) constant temperature function
This unit is mainly finished by temperature control unit, keeps the temperature constant of coal sample jar and jar interior coal sample at the trial, reduces because of the influence of exterior temperature change to the gas adsorption-desorption.
(3) mensuration of coal sample desorption of mash gas initial stage speed is finished the desorption of mash gas initial stage velocity determination of structure coal.
(4) mensuration of coal sample desorption of mash gas initial stage desorption quantity is carried out the mensuration of desorption of mash gas amount simultaneously carrying out the desorption of mash gas velocity determination.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. construct coal desorption of mash gas initial stage rule experimental provision for one kind, it is characterized in that, high-purity gas steel cylinder of this experimental provision is connected to an interface of T-valve through stop valve, an interface process stop valve of T-valve is connected to an interface of four-way valve, and interface of T-valve is directly connected to four-way valve by stop valve; An interface of four-way valve directly connects stop valve, an interface of four-way valve is connected to vacuum meter through stop valve, an interface of four-way valve is connected to vacuum pump through stop valve, and an interface of four-way valve is connected to graduated cylinder by stop valve, and an interface of four-way valve is connected to tensimeter; Tensimeter is connected to the coal sample jar, and the coal sample jar places constant temperature water bath apparatus, and the bottom of coal sample jar is connected with constant temperature water bath apparatus, an interface of four-way valve, be connected to mass-flow gas meter through spherical valve, mass-flow gas meter one end is connected on the computing machine, and the other end is connected on the desorption instrument.
2. structure coal desorption of mash gas initial stage rule experimental provision as claimed in claim 1 is characterized in that, described coal sample jar is the coal sample jar that stainless steel material processes, tank body wall thickness 10cm, and the tank body volume is about 150cm
3, tank interior exports and is designed to 10mm with the sealing of high pressure packing ring, tank body top installation stop valve and precision pressure gauge, stop valve.
3. structure coal desorption of mash gas initial stage rule experimental provision as claimed in claim 1 is characterized in that described experimental provision also is equipped with the desorb graduated cylinder, and high 100cm, diameter are 31cm, and gas volume is 60L.
4. structure coal desorption of mash gas initial stage rule experimental provision as claimed in claim 1 is characterized in that, described constant temperature water bath apparatus shell adopts sheet metal, and its control box is directly installed on the water tank; Described constant temperature water bath apparatus is provided with two of turnover water nozzles, adopts water pump as circulation power in the water tank.
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| CN103558117A (en) * | 2013-11-12 | 2014-02-05 | 中国矿业大学 | Corrosion-resistant multifunctional low-gas-containing bulk sample content desorber |
| CN103728349A (en) * | 2014-01-16 | 2014-04-16 | 河南理工大学 | Entire automatic testing method and device for gas desorption speed of resistance-type coal sample |
| CN103760064A (en) * | 2014-01-23 | 2014-04-30 | 平顶山天安煤业股份有限公司 | Coal sample gas adsorption and desorption experiment device and method under variable pressure condition |
| CN105259069A (en) * | 2015-10-29 | 2016-01-20 | 贵州大学 | Simple experiment device and method for shale gas adsorption and desorption |
| CN105424905A (en) * | 2015-12-18 | 2016-03-23 | 河南理工大学 | Gas abnormity desorption characteristic test device and method in coal body destruction process |
| CN105588929A (en) * | 2016-03-20 | 2016-05-18 | 贵州大学 | Water bath constant-temperature methane diffusion determination system |
| CN105651961A (en) * | 2016-01-14 | 2016-06-08 | 太原理工大学 | Prediction method of coal seam outburst danger |
| CN105759008A (en) * | 2016-04-26 | 2016-07-13 | 贵州大学 | Measuring device and method for gas adsorption and desorption amount |
| CN106840991A (en) * | 2016-12-07 | 2017-06-13 | 中国矿业大学 | A kind of many PROCESS COUPLING pilot systems of Unconventional gas rock gas heat |
| CN107478559A (en) * | 2017-07-26 | 2017-12-15 | 太原理工大学 | A kind of device and method simulated gas and migrated in different-grain diameter size coal sample |
| CN107515185A (en) * | 2017-09-04 | 2017-12-26 | 河南理工大学 | A kind of coal body permeability test device and its application method |
| CN107560972A (en) * | 2017-08-25 | 2018-01-09 | 重庆大学 | Coal adsorption-desorption Experiment of Methane device and method under ul-trasonic irradiation |
| CN107561247A (en) * | 2017-09-30 | 2018-01-09 | 贵州大学 | A kind of WT 1 type gas speed determinators of controllable temperature |
| CN107796730A (en) * | 2017-10-31 | 2018-03-13 | 河南理工大学 | A kind of extra electric field strengthens coal sample desorption of mash gas test method |
| CN108732329A (en) * | 2018-05-14 | 2018-11-02 | 华北科技学院 | A kind of determination of coal seam gas pressure analog simulation experimental device and method |
| CN109900592A (en) * | 2019-03-29 | 2019-06-18 | 平安煤炭开采工程技术研究院有限责任公司 | Test device for desorption |
| CN111189965A (en) * | 2018-11-14 | 2020-05-22 | 中国石油化工股份有限公司 | Device for rapidly evaluating performance of hydrogen sulfide scavenger |
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| CN103558117A (en) * | 2013-11-12 | 2014-02-05 | 中国矿业大学 | Corrosion-resistant multifunctional low-gas-containing bulk sample content desorber |
| CN103728349A (en) * | 2014-01-16 | 2014-04-16 | 河南理工大学 | Entire automatic testing method and device for gas desorption speed of resistance-type coal sample |
| CN103760064B (en) * | 2014-01-23 | 2016-09-07 | 中国平煤神马能源化工集团有限责任公司 | Coal sample gas adsorption desorption experimental apparatus and method under the conditions of transformation |
| CN103760064A (en) * | 2014-01-23 | 2014-04-30 | 平顶山天安煤业股份有限公司 | Coal sample gas adsorption and desorption experiment device and method under variable pressure condition |
| CN105259069A (en) * | 2015-10-29 | 2016-01-20 | 贵州大学 | Simple experiment device and method for shale gas adsorption and desorption |
| CN105259069B (en) * | 2015-10-29 | 2018-10-19 | 贵州大学 | Shale gas adsorption-desorption simple experimental device and experimental method |
| CN105424905A (en) * | 2015-12-18 | 2016-03-23 | 河南理工大学 | Gas abnormity desorption characteristic test device and method in coal body destruction process |
| CN105651961A (en) * | 2016-01-14 | 2016-06-08 | 太原理工大学 | Prediction method of coal seam outburst danger |
| CN105588929A (en) * | 2016-03-20 | 2016-05-18 | 贵州大学 | Water bath constant-temperature methane diffusion determination system |
| CN105759008A (en) * | 2016-04-26 | 2016-07-13 | 贵州大学 | Measuring device and method for gas adsorption and desorption amount |
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| CN106840991B (en) * | 2016-12-07 | 2019-04-23 | 中国矿业大学 | A kind of Unconventional gas rock-more PROCESS COUPLING pilot systems of gas-heat |
| CN107478559A (en) * | 2017-07-26 | 2017-12-15 | 太原理工大学 | A kind of device and method simulated gas and migrated in different-grain diameter size coal sample |
| CN107478559B (en) * | 2017-07-26 | 2020-11-24 | 太原理工大学 | Device and method for simulating migration of gas in coal samples with different particle sizes |
| CN107560972A (en) * | 2017-08-25 | 2018-01-09 | 重庆大学 | Coal adsorption-desorption Experiment of Methane device and method under ul-trasonic irradiation |
| CN107515185A (en) * | 2017-09-04 | 2017-12-26 | 河南理工大学 | A kind of coal body permeability test device and its application method |
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| CN108732329A (en) * | 2018-05-14 | 2018-11-02 | 华北科技学院 | A kind of determination of coal seam gas pressure analog simulation experimental device and method |
| CN108732329B (en) * | 2018-05-14 | 2023-07-28 | 华北科技学院 | Coal seam gas pressure measurement simulation experiment device and method |
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| CN109900592A (en) * | 2019-03-29 | 2019-06-18 | 平安煤炭开采工程技术研究院有限责任公司 | Test device for desorption |
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Inventor after: Jiang Linhua Inventor after: Zhao Yu Inventor after: Hou Jinxiu Inventor after: Li Yunbo Inventor after: Lei Dongji Inventor after: Xie Xiangxiang Inventor before: Jiang Linhua Inventor before: Zhao Yu Inventor before: Hou Jinxiu Inventor before: Li Yunbo Inventor before: Xie Xiangxiang |
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Free format text: CORRECT: INVENTOR; FROM: JIANG LINHUA ZHAO YU HOU JINXIU LI YUNBO XIE XIANGXIANG TO: JIANG LINHUA ZHAO YU HOU JINXIU LI YUNBO LEI DONGJI XIE XIANGXIANG |
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Application publication date: 20131002 |