CN103149012A - Experimental device and method for simulating flow characteristic of coal bed gas gathering and transportation pipeline - Google Patents
Experimental device and method for simulating flow characteristic of coal bed gas gathering and transportation pipeline Download PDFInfo
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- CN103149012A CN103149012A CN2013100752009A CN201310075200A CN103149012A CN 103149012 A CN103149012 A CN 103149012A CN 2013100752009 A CN2013100752009 A CN 2013100752009A CN 201310075200 A CN201310075200 A CN 201310075200A CN 103149012 A CN103149012 A CN 103149012A
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Abstract
The invention discloses an experimental device and method for simulating a flow characteristic of a coal bed gas gathering and transportation pipeline. The experimental device comprises an experimental pipeline system, a water supplying system, a gas supplying system and a feeding system, wherein the experimental pipeline system is provided with a testing pipe and a feeding end of the testing pipe is connected with a mixer; the testing pipe is provided with an observation pipe; the water supplying system is provided with a water supplying pipe; one end of the water supplying pipe is connected with a water storage tank and the other end of the water supplying pipe is connected with the mixer; the water supplying pipe is connected with a water pump; the gas supplying system is provided with a gas supplying pipe; one end of the gas supplying pipe is connected with an air compressor and the other end of the gas supplying pipe is connected with the mixer; the gas supplying pipe is connected with a buffering tank; the feeding system is provided with a feeding device; and the feeding device is connected with a feeding pipe which is connected with the gas supplying pipe in parallel. According to the experimental device and method disclosed by the invention, gas-liquid, gas-solid and gas-liquid-solid multi-phase flow experiments can be carried out; and multi-phase flow states, influence factors and pressure drop rules of the coal bed gas gathering and transportation pipeline can be described and predicated.
Description
Technical field
The present invention is relevant for a kind of Multiphase Flow experimental provision and method that exists in the coal bed gas field gathering line of simulating, especially relevant for a kind of experimental provision and method of simulating the simulation coal-seam gas gathering line flow characteristics of the gas-liquid that exists in the coal-seam gas gathering line, gas-solid, gas-liquid-solid flow process.
Background technology
In the coal-bed gas exploitation process, because the reasons such as coal seam borehole well instability, matrix break produce coal dust, the water in shaft bottom and coal dust arrive ground in the water pumping gas production process, most of coal dust suspends in water and discharges at well head, but still has part water and coal dust to enter gathering line with gas.This just makes and exists liquid and solid impurity in the gas gathering line, according to the difference of gas well exploitation period and pipeline location, exists gas-liquid, gas-solid, the moving state of gas-liquid-solid multiphase flow in the coal-seam gas pipeline.
The Multiphase Flow of gas gathering line has all brought a difficult problem to pipe design person and conduit running supvr.Duct pressure loss is increased the Multiphase Flow that contains solid particle and liquid water and variation range is large, Accurate Prediction is difficult, may form the problems such as coal slime deposition blocking pipe in operational process.
The multiphase flow experiment circuit is as the main experimental study means of the aspects such as fluid hose properties of flow, flow pattern, Pressure Drop, its experimental result has very strong applicability and directive function to the design and running operation of actual pipeline, more application is at home and abroad arranged, such as wax deposit experiment circuit, the gentle liquid two-phase circuit of hydrate experiment circuit etc.But these circuits all can not be simulated water and this medium that contains of solid particle that exists in the coal-seam gas gathering line,, exist the mobility status of the various working such as gas-liquid, gas-solid, gas-liquid-solid that is.
Therefore, be necessary to provide a kind of and can simulate this experimental provision and the method that exists multiple flow operating mode of coal-seam gas gathering line, overcome defects.
Summary of the invention
The purpose of this invention is to provide a kind of experimental provision of simulating coal-seam gas gathering line flow characteristics, can carry out gas-liquid, gas-solid, the moving experiment of gas-liquid-solid multiphase flow, it can describe and predict Multiphase Flow state, influence factor and the Pressure Drop of coal-seam gas gathering line.
The purpose of this invention is to provide a kind of experimental technique of simulating coal-seam gas gathering line flow characteristics, can carry out gas-liquid, gas-solid, the moving experiment of gas-liquid-solid multiphase flow by this experimental technique, it can accurate description and Multiphase Flow state, influence factor and the Pressure Drop of predicting the coal-seam gas gathering line.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
The invention provides a kind of experimental provision of simulating coal-seam gas gathering line flow characteristics, the experimental provision of described simulation coal-seam gas gathering line flow characteristics comprises:
The experimental channel system, it has testing tube, and the entrance point of described testing tube is connected with mixer, and described testing tube is provided with observation tube;
Water system, it has feed pipe, and an end of described feed pipe is connected with water tank, and its other end is connected with described mixer, is connected with water pump on described feed pipe;
Air supply system, it has air supply pipe, and an end of described air supply pipe is connected with air compressor, and its other end is connected with described mixer, is connected with surge tank on described air supply pipe;
Charging system, it has feeder, and described feeder is connected on the charge pipe that is connected with described air supply pipe parallel connection.
In preferred embodiment, the experimental provision of described simulation coal-seam gas gathering line flow characteristics also comprises filtering system, and described filtering system has hay tank and the cesspool that is connected with described hay tank, and described hay tank is connected with the endpiece of described testing tube.
In preferred embodiment, be connected with differential pressure pickup between the endpiece of the entrance point of described testing tube and described testing tube.
In preferred embodiment, described testing tube is provided with pressure transducer, temperature sensor and conducting probe.
In preferred embodiment, described observation tube is the organic glass transparent pipe, and the outside of described observation tube is provided with high-speed camera, and described high-speed camera is connected with computing machine.
In preferred embodiment, be connected with liquid filter between the water tank of described water system and described water pump.
In preferred embodiment, the water pump of described water system is a plurality of, and described a plurality of water pumps are arranged in parallel on described feed pipe.
In preferred embodiment, the endpiece of described water pump is connected with two water pipes of setting parallel with one another, and a described water pipe is connected with described mixer, and another described water pipe is connected with described water tank by stop valve.
In preferred embodiment, the described water pipe that is connected with described mixer is provided with two liquid flowmeters, described two liquid flowmeter settings parallel with one another.
In preferred embodiment, the surge tank of described air supply system comprises a plurality of first-level buffer tanks and a plurality of level 2 buffering tank, described a plurality of first-level buffer tank is arranged in parallel on described air supply pipe, one end of described a plurality of first-level buffer tanks is connected with described air compressor, and its other end is connected with described level 2 buffering tank series connection respectively.
In preferred embodiment, be provided with gas filter, temperature sensor and pressure transducer on the described air supply pipe between described surge tank and described mixer.
In preferred embodiment, described air supply pipe is provided with two gas meters, and described two gas meters are parallel with one another to be arranged between described surge tank and described mixer.
In preferred embodiment, be connected with equalizing main on described feeder, described equalizing main is connected on described charge pipe.
The present invention also provides a kind of experimental technique of simulating coal-seam gas gathering line flow characteristics, the experimental technique of described simulation coal-seam gas gathering line flow characteristics adopts the experimental provision of above-mentioned simulation coal-seam gas gathering line flow characteristics, and the experimental technique of described simulation coal-seam gas gathering line flow characteristics comprises the steps:
A) export gas by air supply system, by the water system output liquid, export solid by charging system;
B) described gas and described solid, or described gas and described liquid, or described gas, described solid and described liquid inject in the mixer of the testing tube entrance point that is connected to the experimental channel system;
C) described gas and described solid, or described gas and described liquid, or the potpourri that described gas, described solid and described liquid generate after mixing in described mixer flows in described testing tube, the flow state of observing described potpourri by the observation tube that is arranged on described testing tube.
In preferred embodiment, described testing tube is provided with pressure transducer, temperature sensor and conducting probe, measures instantaneous pressure, transient temperature and the liquid holdup of described potpourri by described pressure transducer, described temperature sensor and described conducting probe.
In preferred embodiment, be connected with differential pressure pickup between the endpiece of the entrance point of described testing tube and described testing tube, measure described potpourri pressure difference in flow process in described testing tube by described differential pressure pickup.
In preferred embodiment, described observation tube is the organic glass transparent pipe, and the outside of described observation tube is provided with high-speed camera, and described high-speed camera is connected with computing machine.
The experimental provision of simulation coal-seam gas gathering line flow characteristics of the present invention and characteristics and the advantage of method are: this experimental provision and method can be used for simulating flowing of the gas-solid that exists in the coal-seam gas gathering line, gas-liquid, gas-liquid-solid multiphase medium, switch experiment flow by the valve that opens and closes on different pipelines, complete object of experiment.These apparatus and method have taken into full account the factor that affects the coal-seam gas flow characteristics, the on-the-spot actual condition and having the following advantages of combining closely:
1) rational in infrastructure: as to be connected compact between water system of the present invention, air supply system and charging system and experimental channel system, take full advantage of the laboratory finite space, between water system, air supply system and charging system, easy switching and each measuring equipment satisfy the installation requirement of instrument.
2) design is ingenious: water system of the present invention combines to control water supply flow with water pump with the reflux line of its endpiece cleverly, has enlarged the scope of flow regulation; Charging system takes full advantage of gravity and gas energy of flow and adds the experimental channel system to form simulated condition solid particle.
3) measuring equipment is advanced: the present invention has installed high-precision differential pressure pickup on testing tube, effectively reduce experimental error, adopt high-speed camera to take on observation tube, make the data acquisition amount greatly increase, for research provides more sufficient Data support; In addition, use pressure transducer, temperature sensor and conducting probe to carry out the collection of the multiparameters such as pressure, temperature and liquid holdup, avoid the manually-operated error, realize data acquisition and control automatization.
4) safety and environmental protection: the present invention is provided with safety valve guaranteeing that experimentation is safe and efficient on the first-level buffer tank of air supply system, and during higher than the safety valve setting value, safety valve can be opened pressure release automatically, prevents hypertonia when first-level buffer tank internal pressure.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the experimental provision of simulation coal-seam gas gathering line flow characteristics of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment 1
As shown in Figure 1, the invention provides a kind of experimental provision of simulating coal-seam gas gathering line flow characteristics, it comprises experimental channel system 1, water system 2, air supply system 3 and charging system 4.Wherein: experimental channel system 1 has testing tube 11, and the entrance point 111 of described testing tube 11 is connected with mixer 12, and described testing tube 11 is provided with observation tube 13; Water system 2 has feed pipe 21, and an end of described feed pipe 21 is connected with water tank 22, and its other end is connected with described mixer 12, is connected with water pump 23 on described feed pipe 21; Air supply system 3 has air supply pipe 31, and an end of described air supply pipe 31 is connected with air compressor 32, and its other end is connected with described mixer 12, is connected with surge tank 33 on described air supply pipe 31; Charging system 4 has feeder 41, and described feeder 41 is connected on the charge pipe 42 that is connected with described air supply pipe 31 parallel connections.
Specifically, the testing tube 11 of experimental channel system 1 is circulating line, and it is made by stainless steel material, and the total length of testing tube 11 is 44m, and also, the length from the entrance point 111 of testing tube 11 to the endpiece 112 of testing tube 11 is 44m; The two ends of observation tube 13 are connected on testing tube 11 by flange, in the present invention, observation tube 13 is the organic glass transparent pipe, its length is 0.6m, the outside of observation tube 13 is placed with high-speed camera 14 or particle image velocimeter, high-speed camera 14 is connected with computing machine 16, the flow state that observation tube 13 is used for from extraneous observation test pipe 11 interior media, high-speed camera 14 is placed over against observation tube 13, it is used for catching the instantaneous flow state of testing tube 11 interior media, and high-speed camera 14 stores the image transmitting of its shooting and show to computing machine 16.
In the present embodiment, be connected with differential pressure pickup 17 between the endpiece 112 of the entrance point 111 of testing tube 11 and testing tube 11, this differential pressure pickup 17 is used for medium in collecting test pipe 11 at the pressure difference of flow process.Further, also be provided with pressure transducer 18, temperature sensor 19 and conducting probe 20 in the centre position of testing tube 11, wherein, pressure transducer 18 is used for the instantaneous pressure of the medium in collecting test pipe 11, temperature sensor 19 is used for the transient temperature of the medium in collecting test pipe 11, and conducting probe 20 is used for measuring the liquid holdup of the interior gas-liquid of testing tube 11 or gas-liquid-solid blending agent.
Water system 2 is used for providing liquid phase fluid to experimental channel system 1, its feed pipe 21 is connected to by mixer 12 on the entrance point 111 of testing tube 11 of experimental channel system 1, one end of feed pipe 21 is connected with water tank 22, be loaded with liquid in water tank 22, this liquid pumps in testing tube 11 by water pump 23.In the present invention, be arranged in parallel a plurality of water pumps 23 on feed pipe 21, this water pump 23 is frequency conversion speed adjusting pump, and frequency conversion speed adjusting pump can be controlled the rate of discharge of water pump 23; In the present embodiment, two water pumps 23 have been arranged in parallel on feed pipe 21, certainly, in other embodiment, can only be connected with a water pump 23 on feed pipe 21, also can be arranged in parallel for example 3,4 or more water pump 23 on feed pipe 21, the water pump more than 23 that is arranged in parallel illustrates that the liquid that pumps in the feed pipe 21 is more.
In the present embodiment, be connected with liquid filter 24 between the entrance point of the water tank 22 of water system 2 and water pump 23, this liquid filter 24 is used for filtering the impurity of water tank 22 interior liquid.Further, the endpiece of water pump 23 is connected with water pipe 211 and the water pipe 212 of setting parallel with one another, article one, water pipe 211 is connected with mixer 12, another water pipe 212 is connected with water tank 22 by stop valve 25, to consist of reflux line, a part of liquid backflow that this reflux line is used for water pump 23 is pumped is to water tank 22, and stop valve 25 is used for regulating the flow that is back to the liquid in reflux line, thereby but relative adjustment control water pump 23 pumps into the fluid flow in testing tube 11.The water pipe 211 that is connected with mixer 12 is provided with two liquid flowmeters 27, and this two liquid flowmeter 27 is parallel with one another to be arranged on water pipe 211, and liquid flowmeter 27 is used for gathering the flow of the liquid that flows through in feed pipe 21.In the present invention, one of them liquid flowmeter 27 is the wide range liquid flowmeter, this wide range liquid flowmeter is used for measuring when testing tube 11 is supplied large quantity of fluid at feed pipe 21 flow of liquid, another liquid flowmeter 27 is the small-range liquid flowmeter, this small-range liquid flowmeter is used for the flow of test liquid when feed pipe 21 is supplied a small amount of liquid to testing tube 11, open simultaneously two liquid flowmeters 27, can accurately measure the fluid flow of the feed pipe 21 of flowing through.
Further, also be connected with gate valve 28 and retaining valve 29 on feed pipe 21, gate valve 28 is used for opening or closing the feed pipe 21 of water system 2, and retaining valve 29 is for the liquid backflow that prevents in feed pipe 21.
Air supply system 3 is used for providing to experimental channel system 1 gas of steady flow, its air supply pipe 31 is connected on testing tube 11 entrance points 111 of experimental channel system 1 by mixer 12, one end of air supply pipe 31 is connected with air compressor 32, air compressor 32 is used in ambient atmos compression input air supply pipe 31, and this ambient atmos injects in testing tube 11 after being connected to surge tank 33 bufferings on air supply pipe 31.In the present invention, surge tank 33 is comprised of a plurality of first-level buffer tanks 331 and a plurality of level 2 buffering tank 332, a plurality of first-level buffer tanks 331 are arranged in parallel on air supply pipe 31, one end of a plurality of first-level buffer tanks 331 is connected with air compressor 32 jointly, and its other end is connected with 332 series connection of level 2 buffering tank respectively.In the present embodiment, air compressor 32 is connected with three first-level buffer tanks 331 that are arranged in parallel, wherein two first-level buffer tanks that are arranged in parallel 331 are connected in series with a level 2 buffering tank 332 jointly, and another first-level buffer tank 331 is connected in series another level 2 buffering tank 332.Ambient atmos is flowed through three first-level buffer tanks 331 and is flowed in two level 2 buffering tanks 332 after air compressor 32 compression.First-level buffer tank 331 is used for controlling the input quantity of gas, and level 2 buffering tank 332 is used for the buffering adjusting from the pressure of the gas of first-level buffer tank 331 inputs, guarantees that the gaseous tension in input test pipe 11 is stable.In other embodiment, can only be connected with a first-level buffer tank 331 and a level 2 buffering tank 332 on air supply pipe 31, also can be arranged in parallel for example 4,5 or more first-level buffer tank 331 on air supply pipe 31, each first-level buffer tank 331 connects a level 2 buffering tank 332, the first-level buffer tank more than 331 that is arranged in parallel illustrates to the gas of air supply pipe 31 interior inputs more.In addition, the present invention is connected with respectively safety valve 3311 on a plurality of first-level buffer tanks 331, with the pressure in regulating and controlling first-level buffer tank at any time 331.
Further, be provided with successively gas filter 34, temperature sensor 35 and pressure transducer 36 along gas flow direction on the air supply pipe 31 between surge tank 33 and mixer 12.Wherein, gas filter 34 is used for filtering the impurity of the gas in air supply pipe 31, and temperature sensor 35 is used for gathering the transient temperature of the gas of flowing through in air supply pipe 31, and pressure transducer 36 is used for gathering the instantaneous pressure of the gas of flowing through in air supply pipe 31.
Further, also be provided with two gas meters 37 on the air supply pipe 31 between surge tank 33 and mixer 12, on described two gas meters 37 air supply pipe 31 that is arranged between gas filter 34 and temperature sensor 35 parallel with one another.Gas meter 37 is used for gathering the flow of the gas that flows through in air supply pipe 31.In the present invention, one of them gas meter 37 is the wide range gas meter, this wide range gas meter is used for the flow of measurement gas when air supply pipe 31 is supplied a large amount of gas to testing tube 11, another gas meter 37 is the small-range gas meter, this small-range gas meter is used for the flow of test gas when air supply pipe 31 is supplied a small amount of gas to testing tube 11, open simultaneously two gas meters 37, can accurately measure the gas flow of the air supply pipe 31 of flowing through.In addition, also be connected with stop valve 38 on air supply pipe 31, stop valve 38 is used for regulating the interior air demand of control air supply pipe 31; Also be connected with atmospheric valve 39 on the air supply pipe 31 between gas filter 34 and gas meter 27.
Charging system 4 is used for providing solid particle to experimental channel system 1, its charge pipe 42 is connected in the pressure transducer 36 of air supply system 3 and air supply pipe 31 tops between stop valve 38 in parallel, be connected with feeder 41 on charge pipe 42, in the present invention, feeder 41 is controlled by variable-speed motor and is realized quantifying feed.Charge pipe 42 is due to the top that is positioned at air supply pipe 31, and the solid particles in feeder 41 will fallen under action of gravitation in air supply pipe 31 after discharging, the mixed gases that provides with air supply system 3.
Utilize the experimental provision of this simulation coal-seam gas gathering line flow characteristics to carry out the process of simulated experiment as follows:
1) when carrying out the gas-liquid two-phase experiment: at first, open the air compressor 32 of air supply system 3, close valve 421, valve 422 on the charge pipe 42 of charging system 4, open the valve 311 on air supply pipe 31, outside air is pressed in a plurality of first-level buffer tanks 331 and a plurality of level 2 buffering tank 332 by air compressor 32, gas flows into after gas filter 34 filters in the testing tube 11 of experimental channel system 1, and the stop valve 38 of regulating on air supply pipe 31 reaches the air demand of experiment predetermined value with control, then, open the water pump 23 of water system 2, liquid in water tank 22 is after liquid filter 24 inner filtrations, in water pump 23 pumps into feed pipe 21, then flow into the testing tube 11 of experimental channel system 1, regulate with reflux line that water pump 23 endpiece are connected on stop valve 25, controllable liquid is back to the flow in water tank 22, pump into the interior output of feed pipe 21 with relative control water pump 23, to reach the experiment predetermined value, in addition, be connected to valve 271 and the valve 272 of two liquid flowmeter 27 both sides by adjusting, and valve 273 and valve 274, also can realize controlling the purpose of feed pipe 21 interior fluid floies, the gas that provides through air supply system 3 and the liquid that provides through water system 2 before flowing into testing tube 11, can inject in testing tube 11 after the interior mixing of mixer 12, so that biphase gas and liquid flow fully mixes, at this moment, the fluid in the testing tube 11 of experimental channel system 1 is in the gas-liquid two-phase state that flows, and opens high-speed camera 14, takes the media flow state in observation tube 13, and the experimental data of its shooting is transferred to computing machine 16 monitors and record.
2) when carrying out the experiment of gas-solid two-phase: at first, close the gate valve 28 of water system 2, open valve 421, valve 422 on charging system 4 charge pipes 42, close the valve 311 on air supply system 3 air supply pipes 31, then, open the air compressor 32 of air supply system 3, outside air is pressed in a plurality of first-level buffer tanks 331 and a plurality of level 2 buffering tank 332 by air compressor 32, gas flows in the charge pipe 42 of charging system 4 after gas filter 34 filters, at this moment, open the feeder 41 of charging system 4 and be set as predetermined load, solid particle in feeder 41 will be fallen under action of gravitation in charge pipe 42, mix rear common the inflow in air supply pipe 31 with the gas in flowing into charge pipe 42, flow into after further mixing finally by mixer 12 in the testing tube 11 of experimental channel system 1, be connected to the valve 371 and valve 372 at two gas meter 37 two ends by adjusting, and valve 373 and valve 374, make the air demand in air supply pipe 31 reach the experiment predetermined value, in addition, also can reach the purpose of controlling air demand by the stop valve 38 of regulating on air supply pipe 31, at this moment, the fluid in the testing tube 11 of experimental channel system 1 is in the Gas-solid Two-phase Flow state, opens high-speed camera 14, takes the media flow state in observation tube 13, and the experimental data of its shooting is transferred to computing machine 16 monitors and record.
3) when carrying out the gas-liquid-solid three-phase experiment: at first, open the air compressor 32 of air supply system 3, open the valve 421 on the charge pipe 42 of charging system 3, valve 422, close the valve 311 on air supply pipe 31, outside air is pressed in a plurality of first-level buffer tanks 331 and a plurality of level 2 buffering tank 332 by air compressor 32, gas flows in the charge pipe 42 of charging system 4 after gas filter 34 filters, at this moment, open the feeder 41 of charging system 4 and be set as predetermined load, solid particle in feeder 41 will be fallen under action of gravitation in charge pipe 42, mix rear common the inflow in air supply pipe 31 with the gas in flowing into charge pipe 42, then flow in the testing tube 11 of experimental channel system 1, be connected to the valve 371 and valve 372 at two gas meter 37 two ends by adjusting, and valve 373 and valve 374, make the air demand in air supply pipe 31 reach the experiment predetermined value, in addition, also can reach the purpose of controlling air demand by the stop valve 38 of regulating on air supply pipe 31, then, open the water pump 23 of water system 2, liquid in water tank 22 is after liquid filter 24 inner filtrations, in water pump 23 pumps into feed pipe 21, then flow into the testing tube 11 of experimental channel system 1, regulate with reflux line that water pump 23 endpiece are connected on stop valve 25, controllable liquid is back to the flow in water tank 22, pump into the interior output of feed pipe 21 with relative control water pump 23, to reach the experiment predetermined value, in addition, be connected to valve 271 and the valve 272 of two liquid flowmeter 27 both sides by adjusting, and valve 273 and valve 274, also can realize controlling the purpose of feed pipe 21 interior fluid floies, through gas that air supply system 3 provides, through liquid that water system 2 provides and before the solid that charging system 4 provides is flowing into testing tube 11, can inject in testing tube 11 after the interior mixing of mixer 12, so that gas-liquid-solid three phase flow fully mixes, at this moment, the fluid in the testing tube 11 of experimental channel system 1 is in the gas-liquid-solid three-phase state that flows, and opens high-speed camera 14, takes the media flow state in observation tube 13, and the experimental data of its shooting is transferred to computing machine 16 monitors and record.
The experimental provision of simulation coal-seam gas gathering line flow characteristics of the present invention, be used for flowing of gas-solid that simulation coal-seam gas gathering line exists, gas-liquid, gas-liquid-solid multiphase medium, switch experiment flow by the valve that opens and closes on different pipelines, complete object of experiment.This device has taken into full account the factor that affects the coal-seam gas flow characteristics, the on-the-spot actual condition and having the following advantages of combining closely:
1) rational in infrastructure: as to be connected compact between water system 2 of the present invention, air supply system 3 and charging system 4 and experimental channel system 1, take full advantage of the laboratory finite space, between water system 2, air supply system 3 and charging system 4, easy switching and each measuring equipment satisfy the installation requirement of instrument.
2) design is ingenious: water system 2 of the present invention combines to control water supply flow with water pump 23 with the reflux line of its endpiece cleverly, has enlarged the scope of flow regulation; Charging system 4 takes full advantage of gravity and gas energy of flow and adds experimental channel system 1 to form simulated condition solid particle.
3) measuring equipment is advanced: the present invention has installed high-precision differential pressure pickup 17 on testing tube 11, effectively reduce experimental error, adopt high-speed camera 14 to take on observation tube 13, make the data acquisition amount greatly increase, for research provides more sufficient Data support; In addition, use pressure transducer 18, temperature sensor 19 and conducting probe 20 to carry out the collection of the multiparameters such as pressure, temperature and liquid holdup, avoid the manually-operated error, realize data acquisition and control automatization; Have, high-speed camera 14 is transferred to computing machine 16 with the experimental data of its collection again, becomes possibility thereby gather at short notice the very fast high-frequency physical amount of variation.
4) safety and environmental protection: the present invention is guaranteeing that experimentation is safe and efficient, be provided with safety valve 3311 on the first-level buffer tank 331 of air supply system 3, during higher than safety valve 3311 setting value, safety valve 3311 can be opened pressure release automatically, prevents hypertonia when first-level buffer tank 331 internal pressures.
According to an embodiment of the invention, the experimental provision of this simulation coal-seam gas gathering line flow characteristics also comprises filtering system 5, described filtering system 5 has hay tank 51 and the cesspool 52 that is connected with described hay tank 51, and described hay tank 51 is connected with the endpiece 112 of described testing tube 11.
Specifically, be filled with water in the hay tank 51 of filtering system 5, the one end is connected to testing tube 11 endpiece 112 of experimental channel system 1, its other end is connected with cesspool 52, the fluid of testing tube 11 inclusion granules is introduced in the water of hay tank 51, after this fluid that contains solid particle was washed, solid particle flowed in the water of hay tank 51, and the gas of removing solid particle overflows from the water surface and is discharged to atmosphere.After filtering solid particle, filtering system 5 of the present invention again with gas discharging, avoided containing that granular gas is discharged in atmosphere and contaminated air.
According to an embodiment of the invention, be connected with equalizing main 43 on described feeder 41, described equalizing main 43 is connected on described charge pipe 42.This equalizing main 43 is used for the space in feeder 41 and the intracavity inter-connection of charge pipe 42, the interior space pressure of feeder 41 and the pressure of charge pipe 42 inner chambers are balanced each other, and the solid particles of being convenient in feeder 41 join in the air supply pipe 31 of certain pressure smoothly.
Embodiment 2
The present invention also provides a kind of experimental technique of simulating coal-seam gas gathering line flow characteristics, the experimental technique of described simulation coal-seam gas gathering line flow characteristics adopts the experimental provision of the simulation coal-seam gas gathering line flow characteristics of embodiment 1, structure, principle of work and the beneficial effect of the experimental provision of described simulation coal-seam gas gathering line flow characteristics are identical with embodiment 1, do not repeat them here.The experimental technique of described simulation coal-seam gas gathering line flow characteristics comprises the steps:
A) by air supply system 3 output gases, by water system 2 output liquids, by charging system 4 output solids;
B) described gas and described solid, or described gas and described liquid, or described gas, described solid and described liquid inject in the mixer 12 of testing tube 11 entrance points 111 that are connected to experimental channel system 1;
C) described gas and described solid, or described gas and described liquid, or described gas, described solid and described liquid are in the described testing tube 11 of potpourri inflow that the interior mixing of described mixer 12 generates afterwards, by being arranged on the flow state of the observation tube 13 described potpourris of observation on described testing tube 11.
Specifically, the process of utilizing the experimental provision of the simulation coal-seam gas gathering line flow characteristics of embodiment 1 to test is as follows:
1) when carrying out the gas-liquid two-phase experiment: at first, open the air compressor 32 of air supply system 3, close valve 421, valve 422 on the charge pipe 42 of charging system 4, open the valve 311 on air supply pipe 31, outside air is pressed in a plurality of first-level buffer tanks 331 and a plurality of level 2 buffering tank 332 by air compressor 32, gas flows into after gas filter 34 filters in the testing tube 11 of experimental channel system 1, and the stop valve 38 of regulating on air supply pipe 31 reaches the air demand of experiment predetermined value with control, then, open the water pump 23 of water system 2, liquid in water tank 22 is after liquid filter 24 inner filtrations, in water pump 23 pumps into feed pipe 21, then flow into the testing tube 11 of experimental channel system 1, regulate with reflux line that water pump 23 endpiece are connected on stop valve 25, controllable liquid is back to the flow in water tank 22, pump into the interior output of feed pipe 21 with relative control water pump 23, to reach the experiment predetermined value, in addition, be connected to valve 271 and the valve 272 of two liquid flowmeter 27 both sides by adjusting, and valve 273 and valve 274, also can realize controlling the purpose of feed pipe 21 interior fluid floies, the gas that provides through air supply system 3 and the liquid that provides through water system 2 before flowing into testing tube 11, can inject in testing tube 11 after the interior mixing of mixer 12, so that biphase gas and liquid flow fully mixes, at this moment, the fluid in the testing tube 11 of experimental channel system 1 is in the gas-liquid two-phase state that flows, and opens high-speed camera 14, takes the media flow state in observation tube 13, and the experimental data of its shooting is transferred to computing machine 16 monitors and record.
2) when carrying out the experiment of gas-solid two-phase: at first, close the gate valve 28 of water system 2, open valve 421, valve 422 on charging system 4 charge pipes 42, close the valve 311 on air supply system 3 air supply pipes 31, then, open the air compressor 32 of air supply system 3, outside air is pressed in a plurality of first-level buffer tanks 331 and a plurality of level 2 buffering tank 332 by air compressor 32, gas flows in the charge pipe 42 of charging system 4 after gas filter 34 filters, at this moment, open the feeder 41 of charging system 4 and be set as predetermined load, solid particle in feeder 41 will be fallen under action of gravitation in charge pipe 42, mix rear common the inflow in air supply pipe 31 with the gas in flowing into charge pipe 42, flow into after further mixing finally by mixer 12 in the testing tube 11 of experimental channel system 1, be connected to the valve 371 and valve 372 at two gas meter 37 two ends by adjusting, and valve 373 and valve 374, make the air demand in air supply pipe 31 reach the experiment predetermined value, in addition, also can reach the purpose of controlling air demand by the stop valve 38 of regulating on air supply pipe 31, at this moment, the fluid in the testing tube 11 of experimental channel system 1 is in the Gas-solid Two-phase Flow state, opens high-speed camera 14, takes the media flow state in observation tube 13, and the experimental data of its shooting is transferred to computing machine 16 monitors and record.
3) when carrying out the gas-liquid-solid three-phase experiment: at first, open the air compressor 32 of air supply system 3, open the valve 421 on the charge pipe 42 of charging system 3, valve 422, close the valve 311 on air supply pipe 31, outside air is pressed in a plurality of first-level buffer tanks 331 and a plurality of level 2 buffering tank 332 by air compressor 32, gas flows in the charge pipe 42 of charging system 4 after gas filter 34 filters, at this moment, open the feeder 41 of charging system 4 and be set as predetermined load, solid particle in feeder 41 will be fallen under action of gravitation in charge pipe 42, mix rear common the inflow in air supply pipe 31 with the gas in flowing into charge pipe 42, then flow in the testing tube 11 of experimental channel system 1, be connected to the valve 371 and valve 372 at two gas meter 37 two ends by adjusting, and valve 373 and valve 374, make the air demand in air supply pipe 31 reach the experiment predetermined value, in addition, also can reach the purpose of controlling air demand by the stop valve 38 of regulating on air supply pipe 31, then, open the water pump 23 of water system 2, liquid in water tank 22 is after liquid filter 24 inner filtrations, in water pump 23 pumps into feed pipe 21, then flow into the testing tube 11 of experimental channel system 1, regulate with reflux line that water pump 23 endpiece are connected on stop valve 25, controllable liquid is back to the flow in water tank 22, pump into the interior output of feed pipe 21 with relative control water pump 23, to reach the experiment predetermined value, in addition, be connected to valve 271 and the valve 272 of two liquid flowmeter 27 both sides by adjusting, and valve 273 and valve 274, also can realize controlling the purpose of feed pipe 21 interior fluid floies, through gas that air supply system 3 provides, through liquid that water system 2 provides and before the solid that charging system 4 provides is flowing into testing tube 11, can inject in testing tube 11 after the interior mixing of mixer 12, so that gas-liquid-solid three phase flow fully mixes, at this moment, the fluid in the testing tube 11 of experimental channel system 1 is in the gas-liquid-solid three-phase state that flows, and opens high-speed camera 14, takes the media flow state in observation tube 13, and the experimental data of its shooting is transferred to computing machine 16 monitors and record.
The experimental technique of simulation coal-seam gas gathering line flow characteristics of the present invention, can simulate flowing of the gas-solid that exists in the coal-seam gas gathering line, gas-liquid, gas-liquid-solid multiphase medium, simulate by switching that on the experimental provision of coal-seam gas gathering line flow characteristics, the valve on different pipelines switches experiment flow, complete object of experiment.This method has taken into full account the factor that affects the coal-seam gas flow characteristics, the on-the-spot actual condition and having the following advantages of combining closely:
1) rational in infrastructure: as to be connected compactness between water system 2, air supply system 3 and the charging system 4 of the experimental provision that the method is used and experimental channel system 1, take full advantage of the laboratory finite space, between water system 2, air supply system 3 and charging system 4, easy switching and each measuring equipment satisfy the installation requirement of instrument.
2) design is ingenious: the water system 2 of the experimental provision that the method is used combines to control water supply flow with water pump 23 with the reflux line of its endpiece cleverly, has enlarged the scope of flow regulation; Charging system 4 takes full advantage of gravity and gas energy of flow and adds experimental channel system 1 to form simulated condition solid particle.
3) measuring equipment is advanced: the experimental provision that the method is used has been installed high-precision differential pressure pickup 17 on testing tube 11, effectively reduce experimental error, adopt high-speed camera 14 to take on observation tube 13, make the data acquisition amount greatly increase, for research provides more sufficient Data support; In addition, use pressure transducer 18, temperature sensor 19 and conducting probe 20 to carry out the collection of the multiparameters such as pressure, temperature and liquid holdup, avoid the manually-operated error, realize data acquisition and control automatization.
4) safety and environmental protection: the experimental provision that the method is used is guaranteeing that experimentation is safe and efficient, be provided with safety valve 3311 on the first-level buffer tank 331 of air supply system 3, when first-level buffer tank 331 internal pressures during higher than safety valve 3311 setting value, safety valve 3311 can be opened pressure release automatically, prevents hypertonia.
The above is only several embodiments of the present invention, and those skilled in the art can carry out various changes or modification and not break away from the spirit and scope of the present invention the embodiment of the present invention according to the disclosed content of application documents.
Claims (17)
1. an experimental provision of simulating coal-seam gas gathering line flow characteristics, is characterized in that, the experimental provision of described simulation coal-seam gas gathering line flow characteristics comprises:
The experimental channel system, it has testing tube, and the entrance point of described testing tube is connected with mixer, and described testing tube is provided with observation tube;
Water system, it has feed pipe, and an end of described feed pipe is connected with water tank, and its other end is connected with described mixer, is connected with water pump on described feed pipe;
Air supply system, it has air supply pipe, and an end of described air supply pipe is connected with air compressor, and its other end is connected with described mixer, is connected with surge tank on described air supply pipe;
Charging system, it has feeder, and described feeder is connected on the charge pipe that is connected with described air supply pipe parallel connection.
2. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1, it is characterized in that, the experimental provision of described simulation coal-seam gas gathering line flow characteristics also comprises filtering system, described filtering system has hay tank and the cesspool that is connected with described hay tank, and described hay tank is connected with the endpiece of described testing tube.
3. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1, is characterized in that, is connected with differential pressure pickup between the endpiece of the entrance point of described testing tube and described testing tube.
4. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1, is characterized in that, described testing tube is provided with pressure transducer, temperature sensor and conducting probe.
5. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1, is characterized in that, described observation tube is the organic glass transparent pipe, and the outside of described observation tube is provided with high-speed camera, and described high-speed camera is connected with computing machine.
6. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1, is characterized in that, is connected with liquid filter between the water tank of described water system and described water pump.
7. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1, is characterized in that, the water pump of described water system is a plurality of, and described a plurality of water pumps are arranged in parallel on described feed pipe.
8. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1, it is characterized in that, the endpiece of described water pump is connected with two water pipes of setting parallel with one another, article one, described water pipe is connected with described mixer, and another described water pipe is connected with described water tank by stop valve.
9. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 8, is characterized in that, the described water pipe that is connected with described mixer is provided with two liquid flowmeters, described two liquid flowmeter settings parallel with one another.
10. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1, it is characterized in that, the surge tank of described air supply system comprises a plurality of first-level buffer tanks and a plurality of level 2 buffering tank, described a plurality of first-level buffer tank is arranged in parallel on described air supply pipe, one end of described a plurality of first-level buffer tanks is connected with described air compressor, and its other end is connected with described level 2 buffering tank series connection respectively.
11. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1 is characterized in that, is provided with gas filter, temperature sensor and pressure transducer on the described air supply pipe between described surge tank and described mixer.
12. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1 is characterized in that described air supply pipe is provided with two gas meters, described two gas meters are parallel with one another to be arranged between described surge tank and described mixer.
13. the experimental provision of simulation coal-seam gas gathering line flow characteristics as claimed in claim 1 is characterized in that be connected with equalizing main on described feeder, described equalizing main is connected on described charge pipe.
14. experimental technique of simulating coal-seam gas gathering line flow characteristics, it is characterized in that, the experimental technique of described simulation coal-seam gas gathering line flow characteristics adopts the experimental provision of simulation coal-seam gas gathering line flow characteristics as described in any one in claim 1～13, and the experimental technique of described simulation coal-seam gas gathering line flow characteristics comprises the steps:
A) export gas by air supply system, by the water system output liquid, export solid by charging system;
B) described gas and described solid, or described gas and described liquid, or described gas, described solid and described liquid inject in the mixer of the testing tube entrance point that is connected to the experimental channel system;
C) described gas and described solid, or described gas and described liquid, or the potpourri that described gas, described solid and described liquid generate after mixing in described mixer flows in described testing tube, the flow state of observing described potpourri by the observation tube that is arranged on described testing tube.
15. the experimental technique of simulation coal-seam gas gathering line flow characteristics as claimed in claim 14, it is characterized in that, described testing tube is provided with pressure transducer, temperature sensor and conducting probe, measures instantaneous pressure, transient temperature and the liquid holdup of described potpourri by described pressure transducer, described temperature sensor and described conducting probe.
16. the experimental technique of simulation coal-seam gas gathering line flow characteristics as claimed in claim 14, it is characterized in that, be connected with differential pressure pickup between the endpiece of the entrance point of described testing tube and described testing tube, measure described potpourri pressure difference in flow process in described testing tube by described differential pressure pickup.
17. the experimental technique of simulation coal-seam gas gathering line flow characteristics as claimed in claim 14 is characterized in that described observation tube is the organic glass transparent pipe, the outside of described observation tube is provided with high-speed camera, and described high-speed camera is connected with computing machine.
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