5328 results about "Gas pipeline" patented technology

A method for locating gas leaks from underground gas pipelines in which a first acoustic sensor having a first signal output is positioned in ground disposed substantially above or at a distance from the underground gas pipeline. At least one second acoustic sensor having a second signal output is positioned in the ground at a plurality of locations substantially above the underground gas pipeline. The output signals from the acoustic sensors are measured for each location of the second acoustic sensor and the signals are adaptively filtered to remove common noise signal components. The statistical minima of these rms voltages are determined for both the first output signal and the adaptively filtered second output signals and the differences determined. The location of the second acoustic sensor corresponding to the largest positive said difference is the location closest to the leak site.

Extended-range monitoring and surveillance of facilities and infrastructure—such as oil, water, and gas pipelines and power lines—employs autonomous vertical take-off and landing (VTOL) capable, small unmanned aerial system (sUAS) aircraft and docking platforms for accommodating the sUAS aircraft. Monitoring and surveillance of facilities using one or more embodiments may be performed continually by the sUAS flying autonomously along a pre-programmed flight path. The sUAS aircraft may have an integrated gas collector and analyzer unit, and capability for downloading collected data and analyzer information from the sUAS aircraft to the docking platforms. The gas collector and analyzer unit may provide remote sensing and in-situ investigation of leaks and other environmental concerns as part of a “standoff” (e.g., remote from operators of the system or the facilities) survey that can keep field operators out of harm's way and monitor health of the environment.

The invention discloses a gas pipeline leakage detecting and positioning device and a method based on transient model method, which belong to the technical field of failure diagnosis and flow safety security. The detecting device comprises a sensor group, a signal pre-processing device, an I/V plate, a collecting card, a voltage-stabilized power supply, and an operating condition machine; the detecting method includes of establishing a math model for the liquid flowing in the pipe, solving the flow parameters change in the pipe through a computer under a certain boundary condition, and comparing the model calculating values with the true measuring values at the pipe end; when the difference of the true measuring values and calculating values exceeds a certain range, then a leakage can be identified, and the leakage is positioned through a pressure gradient method. The invention provides a leakage detecting method based on the transient model method, and has the advantages of less investment, high sensitivity and good adaptability, and can be used for detecting and positioning gas leakage and leakage point for on-site gas pipeline.

The invention discloses a method for building a city gas pipe network vulnerability evaluation model. The method comprises the following steps that an evaluation model is built through fuzzy hierarchy comprehensive evaluation; a vulnerability evaluation index weight is determined; a city gas pipe network system fuzzy comprehensive evaluation basic model is built. As the system vulnerability evaluation and traditional risk evaluation are similar and both need to build evaluation index systems according to evaluation purposes, a proper evaluation method is selected to build an evaluation mathematical model, the model is utilized to conduct system vulnerability calculation and vulnerability grading, the quantitative and qualitative combined system vulnerability evaluation is achieved, and a research result of the city gas vulnerability can lay the foundation for improving the level of a Chinese gas pipeline management technology, prolonging the service life of a city gas pipeline and avoiding or reducing sudden invalidation accidents. With the deepening of the vulnerability research, the vulnerability evaluation is introduced in the filed of research of the science of disasters, the point of view of the safety evaluation is made to be wider, the content of the safety evaluation is made to be fuller, and the evaluation result has more practical value.

The invention relates to a device and a method for simulating volume fracturing of a horizontal well on a shale reservoir stratum; when crack propagation of the shale reservoir stratum is simulated, a valve at a liquid inlet of a supply source is set to be closed, and a fluid reservoir is communicated with a liquid inlet of a horizontal shaft by a pipe line; when the production process of the shale reservoir stratum is simulated, the fluid reservoir is communicated with the liquid inlet of the supply source by the pipe line, and the liquid inlet of the horizontal shaft is communicated with the atmosphere; a man-made fracture model is arranged at a bullet hole of the horizontal shaft; when the production process of the shale reservoir stratum is simulated, a gas tank is communicated with the liquid inlet of the supply source by a gas pipeline, and the liquid inlet of the horizontal shaft is communicated with the atmosphere. According to the invention, according to the similarity principle, the crack initiation and extending processes of the volume fracturing can be simulated, the density and the volume of a fracture network are determined, the effect of crack parameters on the fracturing capacity of the horizontal well on the shale reservoir stratum is researched, fracturing construction parameters and the crack parameters are optimized and a key problem of fracturing of the shale reservoir stratum is solved.

The invention relates to a pipeline detection robot. The pipeline detection robot mainly comprises a laser detection mechanism (1), a traction mechanism (2), an electromagnetic ultrasonic detection mechanism (3) and an electronic cabin (4), all of which are connected through connecting hinge shafts; the traction mechanism (1) adopts a single-motor all-drive mode and is driven by a turbo-worm synchronous belt to supply a walking power to the robot; the laser detection mechanism (2) comprises a laser displacement sensor, a rotating arm, a counterweight, a support body and the like and is used for measuring surface corrosion and deformation of a pipeline; the electromagnetic ultrasonic detection mechanism (3) comprises a support assembly, a probe and a fixing plate and is used for measuring the wall thickness and the crack defect of the pipeline; the electronic cabin (4) is used for carrying auxiliary components, such as a stepping motor controller, a servo motor driver, a power supply and an FPGA (Field Programmable Gate Array) control panel. The pipeline detection robot disclosed by the invention can be used for finding the defects, such as pipeline corrosion, cracks and deformation, carrying out in-service detection on an oil and gas pipeline in a working process, carrying out targeted repair, maintenance and replacement according to a detection result, reducing the maintenance cost and guaranteeing safe and stable operation of the oil and gas pipeline.

The invention provides a method which uses transient online diagnosis coupling frequency response to position the leakage of natural gas pipeline, and relates to a natural gas pipeline failure detection and positioning method which can solve the problems that the existing method for detecting and positioning the leakage of the natural gas pipeline can not detect in real time, has long detection period, low positioning precision and high error report rate; real-time pressure value and real-time flux value are respectively collected at the upstream and downstream of the pipeline; the real-time downstream pressure value and the real-time flux value when the pipeline runs stably are reduced by the practical real-time pressure value and the practical real-time flux value at the downstream; if both of the two differences exceed the valve value, the leakage is considered to occur, otherwise the values are collected again; an excitation pressure wave is generated at the downstream end of the pipeline and the wave speed of the response wave of the excitation pressure wave is gained; according to the wave speed of the excitation pressure response wave and the time difference when the excitation pressure response wave is transmitted to the upstream and the downstream, the position of the leakage point is gained. The measurement and collection of the values are completed by normal equipments and the method can be used both in the built pipeline or pipelines under construction.

The invention discloses an ultrasonic phased array inspection oil-gas pipe circular weld defect automatic recognition method, in particular to an ultrasonic phased array inspection oil-gas pipe circular weld defect automatic recognition method for a support vector machine, which belongs to a pipe circular weld defect type recognition technology. The recognition method includes two parts of the construction of a support vector machine model and the automatic recognition of unknown defect types in circular weld. The construction steps of the support vector machine model include artificial defect signals extraction, wavelet decomposition promotion, feature extraction, feature optimization and the training of the support vector machine model. The automatic recognition steps of unknown defect types in circular weld include defect signals extraction, optimized feature calculation and automatic recognition based on the support vector machine. The invention combines a lifting wavelet transform with a fractal technology and has the advantages of high recognition accuracy and fast recognition speed. The automatic recognition of the defect types can be realized.

The invention discloses a device and a method for safely and efficiently exploiting an ocean natural gas hydrate through depressurizing decomposition. The device comprises a sand production preventing device, a gas-water separation device and a safety protection device, and can be provided with a secondary hydrate generation preventing device. The method for safely and efficiently exploiting the ocean natural gas hydrate through the depressurizing decomposition by using the device comprises the following steps that gas, water and sands, which are formed by decomposition, flow to a shaft, the mud and the sands of a deposition layer are blocked, and the gas and the water enter the shaft; under the extraction action of a water pump, the gas and the water flow upwards along the shaft, are separated to enter respective pipelines, and are lifted to an exploitation platform or an exploitation ship finally; well pressure is detected in real time; once a hydrate layer is abnormally self-isolated, the gas pipeline and the water pipeline are turned off, and gas production is temporarily stopped. According to the device and the method, the flowing sands formed by the decomposition of the hydrate can be well prevented from entering the shaft, gas-water separation is realized in the shaft, secondary generation of the hydrate in the shaft is prevented, and the ocean natural gas hydrate can be safely and efficiently exploited.

The invention discloses a device for testing a coupling function of a multi-physics field of core rock and a use method of the device. The device is a sealed barrel body which is composed of a top cover, a barrel body and a base disc; a column chamber and a temperature sensor are arranged in the device; a plunger is installed inside the column chamber; a pressure groove is arranged inside the barrel body; an airbag and a convex rubber piston are arranged inside the pressure groove; the airbag is connected with an external high pressure gas source; a gas pipeline for filling gas to the barrel body is arranged in the plunger; an acoustic emission sensor is installed inside the rubber piston; the acoustic emission sensor is connected with an external acoustic emission acquiring system; a gas discharge port is arranged on the base disc and is connected with a gas pressure difference transmitter, a gas mass flowmeter and a gas data acquirer; and electric heating wires are arranged inside the base disc. With the adoption of the device, not only the transformation and the acoustic emission activity of a coal test piece at different temperatures and stress states are recorded in real time, but also the absorption and desorption processes of coal-gas are carried out; and the visual microstructure characteristics of the coal test piece are quantified by using the CT (computed tomography) technology.

The invention relates to the technical field of recycling of a synthetic ammonia relief gas, and discloses a separation and recycling device and a recycling method for methane and argon in the synthetic ammonia relief gas. The device comprises a cooling box, a virgin gas pipeline, a water cooler, a gas-liquid separator, a gas-liquid balancing tank, a throttling reducing valve, a purification system, a refrigeration system and a rectifying system, wherein the refrigeration system comprises a mixed refrigerant circulating compressor, a medium-pressure circulating nitrogen compressor and a main heat exchanger; the medium-pressure circulating nitrogen compressor is connected with the water cooler and the main heat exchanger through a pipeline respectively; the rectifying system comprises a dehydrogenation tower, a methane rectifying tower and an argon rectifying tower; and the main heat exchanger, the dehydrogenation tower, the methane rectifying tower and the argon rectifying tower are connected through pipelines. By the device and the method for separating and recycling the methane and the argon from the synthetic ammonia relief gas by utilizing the mixed refrigerant and argon double-refrigeration system, high-purity methane and high-purity argon can be obtained, and nitrogen with relatively higher purity and hydrogen with relatively higher purity can be obtained at the same time.

The invention relates to a low-temperature trace lubrication system which is characterized in that the system comprises a gas source pipeline, a trace lubrication device, an oil mass regulating valve, an oil mist pipeline, spray nozzles, a mixer, a cold gas pipeline, a low-temperature gas flow regulating valve, a low-temperature gas generation device, a pressure regulating valve of the low-temperature gas generation device and a pressure regulating valve of the trace lubrication device. Part of compressed gas enters the trace lubrication device by the gas source pipeline, and the other part of the compressed gas enters the pressure regulating valve of the low-temperature gas generation device and the pressure regulating valve of the trace lubrication device. After the pressure of the compressed gas is regulated by the pressure regulating valve of the trace lubrication device, the compressed gas enters the trace lubrication device, and a generated oil-gas mixture enters the oil mist pipeline. After the pressure of the compressed gas is regulated by the pressure regulating valve of the low-temperature gas generation device, the compressed gas enters the low-temperature gas generation device, and generated cold gas enters the cold gas pipeline after the flow of the cold gas is regulated. The mixing mode of oil mist and cold air can be mixer mixing and can also be mixing after being ejected by the respective spray nozzles.

The invention discloses a temperature-humidity-stress-chemical coupling test platform for porous dielectric material. The test platform comprises a closed container, a load-bearing frame, a mechanical test system, an environment simulating system and a data acquiring system; the load-bearing structure is fixedly arranged at upper and lower two ends of the closed container; the mechanical test system comprises a loading device and a power device; the loading device is arranged in the enclosed container; the environment simulating system comprises a temperature simulating device and a humidity simulating device; the environment simulating system further comprises a chemical simulating device; the chemical simulating device comprises a chemical gas generator and a gas pipeline; the outlet of the gas pipeline is connected in the closed container; and a gas analyzer used for monitoring gas component and concentration is further arranged in the closed container. By adopting the test platform provided by the invention, the temperature and humidity changes in atmosphere environment and the influence of gas containing chemical substance to the long-term mechanical property of material can be simulated; and the test platform is feasible for mechanical multi-field coupling research on materials.

The invention discloses a battery pack temperature control device, which comprises a battery pack module, an air heating module, a heat exchange cooling module, a temperature adjusting medium switching module, a temperature sensing module and a control module, wherein the battery pack module comprises a battery pack body; the air heating module is used for heating air and circulating hot air between the air heating module and the battery pack body through a gas pipeline; the heat exchange cooling module is used for controlling a cooling liquid to circulate through a liquid pipeline between the heat exchange cooling module and the battery pack body, and cooling the cooling liquid; the temperature adjusting medium switching module is used for switching the type of a temperature adjusting medium in the battery pack body; the temperature sensing module is used for detecting an environment temperature at which the battery pack module is; and the control module controls the air heating module, the heat exchange cooling module and the temperature adjusting medium switching module according to the environment temperature. According to the battery pack temperature control device, a battery pack can be adjusted to work at an optimum temperature and the service life of the batteries is prolonged. The invention further discloses a battery pack temperature control method and a vehicle.

The invention discloses a numerical analog method for impact of gas pipeline leakage on an internal flow field, relating to the technical field of gas. The analog method comprises the following stepsof building analog software; modeling gas pipeline leakage and performing simulation analysis; and analyzing gas pipeline leakage numerical results. Before and after gas pipeline leakage, changes of the internal flow field of the pipeline are analyzed; according to computational fluid dynamics (CFD) knowledge, gas pipeline leakage is simulated by using Fluent, and according to fluid dynamics theory, characteristics of the internal flow field of the gas pipeline before and after leakage are obtained through analysis; according to CFD knowledge, gas pipeline leakage under different leakage conditions is simulated, so as to learn that the greater the inlet pressure, the more likely that a leakage accident occures, and the greater the leakage hole diameter, the higher the proportion of a highconcentration area surrounding the leakage hole.

The invention relates to a gas line drag reduction agent and a preparation method thereof, relating to the technical field of the composite of high-molecular compound and piping systems. The drag reduction agent consists of carbon bisulfide, hydrazine hydrate and long chain acid, the mol ratio of which is 1.8:1:1 to 2.2:1:1. The preparation method comprises the following steps: step one, CS2 is taken according to proportional quantity, dripped into the mixed liquor of the hydrazine hydrate and water with proportional quantity under agitation, reflowed for certain time in the temperature range of 90 to 95 DEG C, then cooled for 30 to 60 minutes in ice water bath and pumped and filtered, the mother liquor continues to react for two times, products of the third time are merged, washed by using ethanol and ether sequentially, and recrystallized by using boiling water so as to obtain symmetrical diaminothiourea clear crystal; and step two, symmetrical diaminothiourea with proportional quantity and the long chain acid with proportional quantity are dissolved in a pyridine solvent with nitrogen protection, reflowed at the temperature of 140 to 220 DEG C by adopting a temperature programming method, and react for 3 to 4 hours, then the mixture is cooled to the room temperature and recrystallizated by using the ethanol of 95 percent to obtain the brown product.

An on-line quickly sampling and sample feeding device of multichannel gas consists of gas sampling unit formed by gas pipeline, multiple solenoid valves and a microdiaphragm vacuum pump; an fully-automatic six-way valve for feeding gas sample automatically; pipeline washing unit formed by a gas washing bottle and multiple solenoid valves; control unit formed by multiple switches being controlled manfully or being controlled automatically by computer .The property evaluating system of catalyst by utilizing said device is also disclosed .

The invention relates to a heating device for improving heating quality of steel billets and a using method thereof. The heating device comprises a heating furnace, a heat storage system blower, a flat flame system blower, a combustion-supporting air pipeline, a gas pipeline, a heat storage system draught fan, an air heat exchanger, a gas heat pipe exchanger, a smoke exhaust pipeline and a chimney. 2-4 ignition burners are arranged at a preheating section of a heating furnace, and 12-30 pairs of heat storage type burners and 4-12 flat flame burners are respectively arranged at a heating section and a soaking zone. The using method comprises the following steps of reasonable distribution of combustion-supporting air and gas flow rate of the heat storage type burners and the flat flame burners, sectional configuration of furnace temperature and heating time, preheating of combustion-supporting air and gas temperature through a high-temperature smoke gas and furnace tail gas in grades, alternative furnace feeding of cold and heat steel billets, intermittent movement of the steel billets, and vaporization cooling of the steel billets. The flow field in the furnace is modified through the system, the optimal configuration of flow rates of air and gas in the burner is realized through reasonable arrangement of gas and air pipeline systems, and the waste heat of high-temperature smoke gas of the heating furnace is gradiently utilized, thus the in-furnace time is shortened, the uniformity of heating the steel billets is improved, and the high-efficiency heating of the steel billets is realized.

The invention relates to a dual-layer pipe wall composite-type gas pipeline and a leakage monitoring method for the pipeline, in order to mainly solve the problems that the gas pipeline operation safety in the high-hazard region is insufficient and the leakage point is difficult to confirm. The dual-layer pipe wall composite-type gas pipeline is characterized in that a clearance cavity is arranged between an inner pipe and an outer pipe; nitrogen displacement is carried out in the clearance cavity; the top of the outer wall of the outer pipe is provided with a plurality of vertical branch pipes communicated with the clearance cavity; the top ends of the vertical branch pipes are provided with concrete plates for sealing; the side wall of the outer pipe is communicated with a branch pipe which is bent downward; the tail end of the branch pipe is provided with a pressure blasting plate; the bottom surfaces of the concrete plates are provided with combustible gas probes which extend into the vertical branch pipes and are respectively connected to a combustible gas alarm and an industrial control computer in a remote monitoring room through a simulation signal wire and an RS485 data bus cable; and the industrial contro computer is used for calculating the position of pipeline leakage. The method can be used for determining the leakage point safely and rapidly.

The invention provides a pipeline detection robot based on probe detection, belonging to the technical field of pipeline leakage detection. The pipeline detection robot comprises a machine body, a pressure balancing contraction air bag, a switching interface, a hose, a storage battery, a travel mechanism and a rubber cup. The pipeline detection robot detects a leakage point on the inner wall of a pipeline through a probe of a leakage point detection device, records a displacement through a mileage wheel when the detection device works, and balances an internal and external pressure difference of the leakage point detection device through the pressure balancing contraction air bag. The pipeline detection robot disclosed by the invention does not require power, has a simple structure and strong practicability, and can be widely applied to detection of petroleum and nature gas pipelines.

The large combined plate high-frequency ozone generator consists of earth electrodes, dielectric ceramic chip, heat conducting spacer, high voltage electrode, end sealing part, space locating part, ozone pipe, batten, water pipeline and gas pipeline. Between each two earth electrodes, one discharging unit of the generator is formed, and several discharging units are assembled to constitute electrode unit combination. Each of the units has gas and water inlet pipes and outlet pipes connected to the general pipes via unions and hoses. The present invention is combined ozone generating apparatus with features of simple operation, small size, light weight, low power consumption and great ozone producing capacity. The present invention may be used in deep water treatment, chemical industry, aquatic cultivation and other fields.

The invention discloses an oil-gas pipeline remote real-time health monitoring system based on Internet of Things. The oil-gas pipeline remote real-time health monitoring system mainly comprises data collection nodes, data aggregation nodes, a pipeline health real-time remote monitoring server and software. When the temperature, the pressure, the flow rate, the wall thickness and the leakage elastic waves of a pipeline exceed the threshold value, the data collection nodes automatically send out an uploading request that data are stored to the data aggregation nodes based on the operation mode of intelligent adjustment; after the data aggregation nodes respond to the request and the data are subjected to autonomous decision analysis, timestamp definition and preliminary screening of original collection signals are achieved; meanwhile, a sensor network collecting protocol is switched into a networking protocol, so that remote uploading of the effective data screened preliminarily is completed; and by using the algorithm special for pipeline leakage in the remote monitoring software and conducting periodic self-inspection and evaluation on the healthy state of the oil-gas pipeline and the healthy state of the system nodes, an alarm of accident potentials such as corrosion, leakage and explosion is sent to a client-side user.

The invention relates to a device for manufacturing biological carbon. A pre-heating chamber is positioned in a smoke gas chamber, both ends of the pre-heating chamber are respectively connected with a material outlet rolling tube and a material inlet roller, the other end of the material outlet rolling tube is connected with a middle material cabin, the lower part of the middle material cabin is connected with a material inlet chamber, the other end of the material inlet rolling tube is connected with a gas collection chamber, a mixed gas outlet of the gas collection chamber is connected with a gas inlet of a spraying washing cooling tower, a dry distillation chamber is positioned in a combustion chamber, both ends of the dry distillation chamber are respectively connected with a front rolling tube and a back rolling tube, the other end of the front rolling tube is connected with the material inlet chamber, the other end of the back rolling tube is connected with the material outlet chamber, a cooling chamber is connected under the material outlet chamber, a mixed gas outlet of the material outlet chamber is connected with a gas inlet of the spraying washing cooling tower, an external fuel combustion device and a non-condensed combustible gas combustion device are arranged in a position in the combustion chamber positioned at the lower part of the dry distillation chamber, and a hot smoke gas pipeline is arranged between the top of the combustion chamber and the bottom of the hot smoke gas chamber. The device for manufacturing the biological carbon provided by the invention can be used for industrially manufacturing the biological carbon in a pollution-free way at low cost.

The invention discloses a system for preparing bio-oil and activated carbon by microwave pyrolysis. The system comprises a microwave pyrolysis reactor, a cyclone separator, a condenser, a coke storage bin, a microwave activation reactor, a gas burner, an activated carbon cooling tower and a nitrogen generator, wherein the microwave pyrolysis reactor is connected with the cyclone separator through a pipeline; a gas outlet in the top of the cyclone separator is connected with the condenser; the bottom of the cyclone separator is connected with the coke storage bin; the bottom of the coke storage bin is connected with a material inlet of the microwave activation reactor; a material outlet of the microwave activation reactor is connected with a feed opening of the activated carbon cooling tower through a pipeline; a gas outlet of the microwave activation reactor is connected with a feed pipeline of the gas burner through a pipeline; a gas outlet of the condenser is connected with the gas burner through a pipeline; a gas outlet pipeline of the gas burner is divided into two paths, wherein one path is connected with the microwave activation reactor, and the other path is connected with a fluidizing gas and spouting gas pipeline of the microwave pyrolysis reactor; a gas inlet of the activated carbon cooling tower is connected with a nitrogen pipeline; a gas outlet of the activated carbon cooling tower is merged into the fluidizing gas and spouting gas pipeline through a pipeline; a material outlet is formed in the bottom of the activated carbon cooling tower. The system is high in biomass pyrolysis rate, can obtain high-yield bio-oil and high-quality activated carbon products, and has a favorable application prospect.

Provided is a relative pressure control system has a simple configuration, but enables accurate regulation of a division ratio of an operation gas, and concurrently makes it possible to securely drain the operation gas from an operation gas pipeline in case of emergency. The system includes a plurality of air operated valves of a normally open type that are connected to an operation gas pipeline supplied with an operation gas; pressure sensors that are series connected to the respective air operated valves and that detect output pressures of the respective air operated valves; a controller that controls operation pressures of the respective air operated valves in accordance with the pressures detected by the pressure sensors; and a hard-interlock solenoid valve that correlates the plurality of air operated valves to one another so that at least one of the plurality of air operated valves is normally opened. In the configuration, an opening of a specified one of the plurality of air operated valves is regulated, the operation gas is output at a predetermined division ratio.

The invention discloses a day-ahead economic scheduling method for an electric-pneumatic coupled system based on mixed integer second-order cone programming. A function whose all-day energy and spareall-in cost are minimum is used as a target function, and constraint conditions of a power system and a natural gas system, and electric-pneumatic coupling and conversion relations are considered, toestablish an optimization model of electric-pneumatic coupled system day-ahead economic scheduling. On the basis of the model, through second-order cone relaxation of a steady-state airflow equation of a gas pipeline, a mixed integer second-order cone programming model of day-ahead economic scheduling of the electric-pneumatic coupled system is established, and an initial operation scheme is solved and obtained. Aimed at a problem that an initial scheduling result of a natural gas system is not accurate, a calibration model based on a steady-state power flow calculation method of a natural gassystem is established, so as to modify an initial operation scheme. The method realizes accurate solution of a non-convex nonlinear optimization problem, and provides a feasible, economical and accurate optimal operation scheme for electric-pneumatic coupled system day-ahead scheduling.

The invention discloses a mobile test platform for low-thrust rocket engines. The mobile test platform comprises a mobile platform, a running support, a propellant feeding system and a gas distribution system. The running support, the propellant feeding system and the gas distribution system are integrally mounted on the mobile platform. The mobile platform comprises a testing rack mounting structure, wheels, a load-carrying structure, an inner cavity and a gas distribution panel. The testing rack comprises a motionless support, plate springs, a movable support, an engine support, a thrust support and a thrust sensor. The propellant feeding system comprises a fuel supply system and an oxidant supply system. The gas distribution system comprises a high-pressure gas tank, a pressurizing gas pipeline and a blowdown gas pipeline. All system components are integrated on one mobile platform, so that the mobile test platform has the advantages of miniaturization, portability and the like.

The invention discloses an electromagnetic ultrasonic inclined guiding wave checking method of natural gas pipeline cracks, which is characterized in that electromagnetic ultrasonic energy exchanger units are composed of split-type broken line coils and permanent magnet blocks, and are arranged on an inner checking device in the pipeline along the inclined direction, and generated ultrasonic guiding waves have a certain checking sensitivity on cracks of each direction on the spreading route of the ultrasonic guiding waves. The inclined ultrasonic guiding wave and the supporting guiding wave after crack action of a single emitting electromagnetic ultrasonic energy exchanger unit are received by two annular receiving energy exchangers arranged on both sides of the emitting electromagnetic ultrasonic energy exchanger. A plurality of emitting energy exchanger units are arranged into an annular set, and orderly generate inclined guiding waves so as to cover the entire circumference of the pipeline wall according to time, and the positions and the sizes of the crack defects are fixed according to the received guiding wave signals and the arranging condition of the energy exchangers. The invention realizes the non-contact purpose of the cracks in the natural gas pipeline without liquid coupling check, and can be used for the crack defects of each direction.

The invention relates to a method for detecting and positioning the leakage of an oil-gas pipeline by utilizing an autonomous navigation robot. The method comprises a robot pipeline line-tracking detection method and a terminal computer detection positioning method; marking lines and correcting nodes are painted on the road surface near the pipeline along the axial direction of the pipeline; the robot navigation system adopts the photoelectric coding and correcting node identification method for navigation and line-tracking detection; a data acquisition combiner is formed by an ultrasonic sensor and a smell sensor to acquire a signal of the oil-gas pipeline, the signal passes an amplifying-filtering circuit and a control module, undergoes analog/digital conversion, modulated by a wireless communication module and sent to the computer; analytic software of the system adopts an algorithm combining the adaptive fuzzy noise detection smoothing algorithm and the multi-scale Gaussian filter algorithm to process data of ultrasonic strength and gas strength; and when the two signals are received at the same time and both higher than the threshold values, the leakage of the pipeline can be determined, and the alarm rings and the leakage can be positioned. The method is applicable for the line-tracking detection and leakage positioning of the oil-gas pipeline in an underground comprehensive pipe ditch.

The invention discloses an annular and stereoscopic ecological cycle pig raising system, which comprises a hog house and a waste circulating system, wherein the hog house comprises a house body, a round patio and a house top, the hog house is of an all-steel columnar structure, the interior of the house body is divided into three layers of hog houses, each layer of hog house is divided into a plurality of colony hours by a through fence, and stairs are all arranged among the three layers of hog houses; the round patio is vertically and oppositely embedded in the middle part of the house body, and a lightning rod higher than the hop house is vertically arranged at the center of the patio; an arc-shaped all transparent glass steel tile annually covers the house top. The annular and stereoscopic ecological cycle pig raising system has the advantages of small land occupation and beautiful appearance design, the aesthetic requirements of people are met, the comprehensive construction cost is lower than the comprehensive cost of land levelling, three supplies and one levelling and cultivation body infrastructures of standardized farms, and assorted roads, pipelines, electric power construction, functional limiting cast iron high bed facilities, closed water-linked cooling facilities and gas pipeline warm floor heating facilities, and the annular and stereoscopic ecological cycle pig raising system has very high economic promotion value.