CN102230855A - Dust off-line sampling system in open-loop high-pressure natural gas pipeline and sampling method thereof - Google Patents
Dust off-line sampling system in open-loop high-pressure natural gas pipeline and sampling method thereof Download PDFInfo
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- CN102230855A CN102230855A CN 201110088372 CN201110088372A CN102230855A CN 102230855 A CN102230855 A CN 102230855A CN 201110088372 CN201110088372 CN 201110088372 CN 201110088372 A CN201110088372 A CN 201110088372A CN 102230855 A CN102230855 A CN 102230855A
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Abstract
The invention discloses a dust off-line sampling system in an open-loop high-pressure natural gas pipeline. The dust off-line sampling system disclosed by the invention is characterized by comprising a sampling sub-system, a dust-trapping sub-system, a measuring and regulating sub-system and a discharge sub-system which are sequentially connected in series via pipelines; the sampling sub-system comprises a tube-like sampling nozzle; the dust-trapping sub-system comprises two dust traps arranged in parallel; the measuring and regulating sub-system comprises a flow regulating valve and a flow transmitter in series connection; the flow regulating valve is connected with the dust-trapping sub-system; the discharge sub-system comprises a pressure reducing valve, a sluice valve and a check valve which are sequentially connected in series; the pressure reducing valve is connected with the flow transmitter; and the check valve is connected with a discharge pipeline. The invention has the advantages of high testing precision, good safety and sampling continuity and is rapid and easy to operate.
Description
Technical field
The invention belongs to solid dust collection analysis technical field in the pipeline, relate in particular to the dust off-line sampling system and the method for sampling thereof in a kind of open loop type high pressure gas pipeline.
Background technology
At present, during dust check and analysis in to natural gas line, usually adopt off-line to filter weight method, this detection method is moving sampling principles such as utilization, that is, take out a part of gas by dissimilar sampling mouths from natural gas line and carry out check and analysis, in sampling process, guarantee that sample rate equals the gas flow rates in the conveyance conduit, make representative particle enter sampling system, determine dust concentration and size-grade distribution in the rock gas with this.
Existing sample detecting system mainly comprises sampling mouth and sampling pipe, dust trapping device and flow regulation and pressure, temperature test device.Wherein, sampling mouth and sampling pipe are used for taking out a part of sample gas from rock gas; Dust trapping device is used for capturing the dust of the sampling gas that mouth and sampling pipe took out; Flow regulation and pressure, temperature test device, flow, temperature, the pressure of gas when being used for the displayed record sampling.Sampling power can utilize the pressure of rock gas itself to sample as power, is the skid-mounted type method of sampling.
During dust detects in high pressure gas pipeline, because the natural gas line internal pressure is generally all very high, can reach 10MPa, and rock gas is inflammable gas, this security reliable and operation to sampling system is had higher requirement.Existing filtration weight method is as a kind of dust content detection method of standard, to the detection of dust in the dusty gas be feasible, also be necessary.But existing filtration weight method is in the precision that detects, the safety reliability and the convenience of operation, and all remains on the continuity of sampling further to be improved.
Because the shortcoming that above-mentioned prior art exists, the inventor is actively improved and is innovated based on being engaged in relevant design and on-site experience and professional knowledge, in the hope of realize a kind ofly can improving measuring accuracy, operation is quick and convenient, safe reliability is high, and the dust off-line sampling system and the method for sampling in the successional open loop type high pressure gas pipeline that can guarantee to sample.
Summary of the invention
The purpose of this invention is to provide a kind ofly can improve measuring accuracy, operation is quick and convenient, safe reliability is high, and dust off-line sampling system in the successional open loop type high pressure gas pipeline that can guarantee to sample.
Another object of the present invention provides a kind ofly can improve measuring accuracy, operation is quick and convenient, safe reliability is high, and the dust off-line method of sampling in the successional open loop type high pressure gas pipeline that can guarantee to sample.
For achieving the above object, the present invention proposes dust off-line sampling system in a kind of open loop type high pressure gas pipeline, described sampling system is connected in series successively by pipeline and is formed by sampled subsystem, dust catching subsystem, metering and adjusting subsystem and emptying subsystem, wherein:
Described sampled subsystem comprises tubulose sampling mouth at least, stretches in the high pressure gas pipeline, to introduce the rock gas gaseous sample;
Described dust catching subsystem, comprise two dust catching devices that are arranged in parallel, each described dust catching device is connected with an operation valve group, described operation valve control linkage respectively makes one of them of described two dust catching devices can filter the dust of collecting in the described rock gas gaseous sample in the conducting of the pipeline of corresponding dust catching device or end;
Described metering and adjusting subsystem comprise flow control valve and flow transmitter at least, and described flow control valve and described flow transmitter are connected in series, and described flow control valve is connected with described dust catching subsystem;
Described emptying subsystem comprises reduction valve, gate valve and the non-return valve of serial connection successively at least, and described reduction valve is connected with described flow transmitter, and described non-return valve connects blowdown piping.
Dust off-line sampling system in the aforesaid open loop type high pressure gas pipeline, wherein, described sampled subsystem also comprises:
Pipeline is taken over, and the one end is fixed in the outside of the thief hatch on the natural gas line, and described sampling mouth is taken over by described pipeline and stretched in the described high pressure gas pipeline;
Flange, this flange is connected with the other end that described pipeline is taken over, and described flange is sheathed on the outside of a sleeve pipe, and described sleeve pipe is inserted in the described pipeline adapter, described sampling mouth wears and is fixed in described sleeve pipe, and described flange fixed cover is located on the described sleeve outer wall;
Valve is located between described sampling mouth and the described dust catching subsystem, is used to control the unlatching of described sampling mouth or close.
Dust off-line sampling system in the aforesaid open loop type high pressure gas pipeline, wherein, described dust catching subsystem comprises the first dust catching device and the second dust catching device that is arranged in parallel, the described first dust catching device is connected with the first operation valve group, and the described second dust catching device is connected with the second operation valve group; When the described first operation valve group was in opening, the described second operation valve group was closed, and the described first dust catching device filters the dust of collecting in the described rock gas gaseous sample; And when the described first operation valve group was in closed condition, the described second operation valve group was opened, and the described second dust catching device filters the dust of collecting in the described rock gas gaseous sample.
Dust off-line sampling system in the aforesaid open loop type high pressure gas pipeline, wherein, the described first operation valve group comprises first operation valve and second operation valve, described first operation valve is connected with the entrance point of the described first dust catching device, and described second operation valve is connected with the endpiece of the described first dust catching device; The described second operation valve group comprises the 3rd operation valve and the 4th operation valve, and described the 3rd operation valve is connected with the entrance point of the described second dust catching device, and described the 4th operation valve is connected with the endpiece of the described second dust catching device.
Dust off-line sampling system in the aforesaid open loop type high pressure gas pipeline wherein, is provided with first pressure transducer between described first dust catching device and described second operation valve; Between described second dust catching device and described the 4th operation valve, be provided with second pressure transducer.
Dust off-line sampling system in the aforesaid open loop type high pressure gas pipeline, wherein, described metering with regulate pressure transducer and the temperature sensor that subsystem also is included in the setting of connecting between described flow control valve and the described flow transmitter.
Dust off-line sampling system in the aforesaid open loop type high pressure gas pipeline, wherein, described emptying subsystem also is included in the pressure transducer and the temperature sensor of the setting of connecting between described reduction valve and the described non-return valve.
Dust off-line sampling system in the aforesaid open loop type high pressure gas pipeline, wherein, between pipeline that connects described reduction valve entrance point and described blowdown piping, be connected with first connecting line, between pipeline that is connected in described check valve inlet end and described first connecting line, be connected with second connecting line; On described first connecting line, be provided with the 5th operation valve; On described second connecting line, be provided with the 6th operation valve.
The present invention also provides the dust off-line method of sampling in a kind of open loop type high pressure gas pipeline, and the described method of sampling comprises:
By pipeline be connected in series sampled subsystem, dust catching subsystem successively, metering constitutes sampling system with adjusting subsystem and emptying subsystem,
Tubulose sampling mouth is set in described sampled subsystem, makes described sampling mouth import in the high pressure gas pipeline, with collection rock gas gaseous sample, and with in this rock gas gaseous sample import system pipeline;
In described metering and adjusting subsystem, flow control valve and flow transmitter are set, described flow control valve and described flow transmitter are connected in series, described flow control valve is connected with described dust catching subsystem, adjusting is arranged on the metering and the flow control valve of regulating subsystem in the system pipeline, make the sample rate of sampling mouth equal the rock gas flow velocity of sample point in the natural gas line, moving sampling such as to reach;
In described dust catching subsystem, two dust catching devices that are arranged in parallel, each described dust catching device is connected with an operation valve group, described operation valve control linkage respectively makes one of them of described two dust catching devices can filter the dust of collecting in the described rock gas gaseous sample in the conducting of the pipeline of corresponding dust catching device or end;
By metering and the flow transmitter of regulating subsystem described rock gas gaseous sample is carried out flow metering, whether the check sampling flow moving sampling such as satisfies, and as moving sampling such as satisfying, the maintenance system continues operation; Otherwise, regulate flow control valve, until moving sampling request flow such as reaching;
In described emptying subsystem, serial connection is provided with reduction valve, gate valve and non-return valve successively, described reduction valve is connected with described flow transmitter, described non-return valve connects blowdown piping, rock gas gaseous sample behind feasible process dust catching subsystem and metering and the adjusting subsystem reduces to setup pressure value by the reduction valve pressure of emptying subsystem, enters blowdown piping again.
The dust off-line method of sampling in the aforesaid open loop type high pressure gas pipeline, wherein, described dust catching subsystem comprises the first dust catching device and the second dust catching device that is arranged in parallel, the described first dust catching device is connected with the first operation valve group, and the described second dust catching device is connected with the second operation valve group; Wherein, described of stating in the dust catching device that is arranged in parallel, filter to collect and press the step of contained dust in the rock gas further to comprise:
When the described first operation valve group was in opening, the described second operation valve group was closed, and the described first dust catching device filters the dust of collecting in the described rock gas gaseous sample; And when the described first operation valve group was in closed condition, the described second operation valve group was opened, and the described second dust catching device filters the dust of collecting in the described rock gas gaseous sample.
Compared with prior art, the present invention has following characteristics and advantage:
1, since the present invention with the dust catching subsystem in abutting connection with the sampled subsystem setting, flow control valve and flow transmitter etc. all are positioned at after the dust catching device to the bigger parts of dust influence, thereby guaranteed the accuracy of dust detection in the rock gas gaseous sample has been improved measuring accuracy.
2, in the present invention, natural gas line according to different-diameter, different pressures, the pipeline that different length, different-thickness can be set is taken over, or changes the position of flange on the sampling mouth, thereby the dust-laden that makes sampled subsystem be suitable for the natural gas line of different-diameter, different pressures detects;
3, sampling with single pipe mouth of the present invention is simple in structure, is convenient to processing and installs, and can satisfy on-the-spot test accuracy requirement and safety requirements; And pipeline tapping (thief hatch) is controlled at minimum, has guaranteed on-the-spot security, the reliability of using of high-pressure natural gas.
4, the present invention adopts the structure of two dust catching devices that are arranged in parallel, can only carry out dust catching during each the sampling with a dust catching device, after capturing dust, this dust catching device switches to another dust catching device, finish the dust trapping device that the dust catching device that captures operation then detachably gets off and more renews, thereby play the effect that dust captures continuously, guarantee the continuity of sampling, improved the work efficiency of system.And dust catching body of the present invention is long-pending little, easy and simple to handle, is fit to rig-site utilization.
5, emptying subsystem of the present invention inserts blowdown piping in the rock gas station, and residual gas is by bypass discharge leg, the security that has improved system.
Description of drawings
The following drawings only is intended to the present invention done and schematically illustrates and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is the structured flowchart of dust off-line sampling system in the open loop type high pressure gas pipeline of the present invention;
Fig. 2 is the structural representation of dust off-line sampling system in the open loop type high pressure gas pipeline of the present invention.
Description of reference numerals:
The 1-sampled subsystem; The 11-mouth of sampling; The 12-pipeline is taken over; The 13-flange; The 14-valve; The 15-sleeve pipe; 2-dust catching subsystem; The 21-first dust catching device; The 22-second dust catching device; The 23-first operation valve group; 231-first operation valve; 232-second operation valve; The 24-second operation valve group; 241-the 3rd operation valve; 242-the 4th operation valve; 3-metering and adjusting subsystem; The 31-flow control valve; The 32-flow transmitter; 4-emptying subsystem; The 41-reduction valve; The 42-gate valve; The 43-non-return valve; The 5-pipeline; The 6-high pressure gas pipeline; The 7-blowdown piping; 81-first pressure transducer; 82-second pressure transducer; 83-the 3rd pressure transducer; 84-the 4th pressure transducer; 85-first temperature sensor; 86-second temperature sensor; 87-the 5th operation valve; 88-the 6th operation valve; 91-first connecting line; 92-second connecting line; The 93-spark arrester; The 94-exhaust box.
Embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast description of drawings the specific embodiment of the present invention.
Please refer to Fig. 1, Fig. 2, be respectively the structured flowchart and the structural representation of dust off-line sampling system in the open loop type high pressure gas pipeline of the present invention.As shown in the figure, dust off-line sampling system in the open loop type high pressure gas pipeline of the present invention is connected in series successively by pipeline 5 and is formed by sampled subsystem 1, dust catching subsystem 2, metering and adjusting subsystem 3 and emptying subsystem 4.Described sampled subsystem 1 comprises tubulose sampling mouth 11, pipeline adapter 12, flange 13 and valve 14, and sampling mouth 11 can insert in the high pressure gas pipeline 6, is used to gather the rock gas gaseous sample; One end of pipeline adapter 12 is fixed in the outside of the thief hatch on the natural gas line 6, and described sampling mouth 11 is taken over 12 by pipeline and stretched in the described high pressure gas pipeline 6; Described flange 13 is connected with the other end of described pipeline adapter 12, described flange 13 is sheathed on the outside of a sleeve pipe 15, described sleeve pipe 15 is inserted in described pipeline and takes in 12, described sampling mouth 11 wears and is fixed in described sleeve pipe 15, described flange 13 fixed covers are located on described sleeve pipe 15 outer walls, make sampling mouth 11, sleeve pipe 15 and flange 13 structure that is welded as a whole; Described valve 14 is located between described sampling mouth 11 and the described dust catching subsystem 2, is used to control the unlatching of described sampling mouth 11 or close.In the present invention, natural gas line according to different-diameter, different pressures, the pipeline that different length, different-thickness can be set takes over 12, or when welding assembly, change the position of flange 13 on sampling mouth 11, thereby the dust-laden that makes sampled subsystem 1 be suitable for the natural gas line 6 of different-diameter, different pressures detects, and satisfies pressure pipeline reinforcement requirement as long as pipeline takes over 12; And flange 13 satisfies corresponding pressure rating and requires to get final product.But the present invention also is not limited thereto, and sampling mouth 11, sleeve pipe 14 and flange 13 also can adopt and be threaded or other known connected mode.
Described dust catching subsystem 2, comprise two the dust catching devices 21,22 that are arranged in parallel, each described dust catching device is connected with an operation valve group 23,24, the operation valve group can 23,24 respectively control linkage in the conducting of the pipeline of corresponding dust catching device 21,22 or end, make one of them of described two dust catching devices can filter the dust of collecting in the described rock gas gaseous sample, and no rock gas gaseous sample pass through in another dust catching device.Dust catching device 21,22 filters collection by the precision stainless steel filter cylinder of installing in it to contained dust in the rock gas, and the concrete structure and the principle of work of dust catching device are prior art, are not described in detail at this.
Described metering and adjusting subsystem 3 comprise flow control valve 31 and flow transmitter 32, and described flow control valve 31 is connected in series with described flow transmitter 32, and described flow control valve 31 is connected with the described dust catching subsystem 2 of front portion.By regulating flow control valve 32, make the sample rate of sampling mouth 11 equal the rock gas flow velocity of sample point in the natural gas line 6, moving sampling such as to reach; Flow transmitter 32 is used for the flow velocity of measuring system rock gas gaseous sample, provides effective reference date thereby regulate for flow control valve 32.
Described emptying subsystem 4 comprises reduction valve 41, gate valve 42 and the non-return valve 43 of serial connection successively, described reduction valve 41 is connected with described flow transmitter 32, described non-return valve 43 connects blowdown piping 7, be decompressed to set pressure by metering and the high-pressure natural gas gaseous sample of regulating the subsystem outflow via reduction valve 41 like this, enter the interior blowdown piping 7 of standing by gate valve 42 and non-return valve 43 after reaching the permission blowdown presssure, thereby finish the off-line sampling and the measurement of dust in the natural gas line.
As from the foregoing, because the present invention is provided with dust catching subsystem 2 in abutting connection with sampled subsystem 1, flow control valve 31 and flow transmitter 32 etc. all are positioned at after the dust catching device 21,22 to the bigger parts of dust influence, thereby guaranteed the accuracy of dust detection in the rock gas gaseous sample has been improved measuring accuracy; And sampled subsystem 1 of the present invention comprises tubulose sampling mouth 11, pipeline adapter 12, flange 13 and valve 14, and it is simple in structure, is convenient to processing and installs, and can satisfy high pressure, different-diameter pipeline and on-the-spot test accuracy requirement and safety requirements.
Further, described dust catching subsystem 2 has the first dust catching device 21 and the second dust catching device 22 that is arranged in parallel, the described first dust catching device 21 is connected with the first operation valve group 23, and the described second dust catching device 22 is connected with the second operation valve group 24; When the described first operation valve group 23 is in opening, the described second operation valve group 24 is closed, the rock gas gaseous sample flows into the first dust catching device 21 by the first operation valve group 23, the described first dust catching device 21 filters the dust of collecting in the described rock gas gaseous sample, to be used for the sample detecting analysis; And when the described first operation valve group 21 is in closed condition, the described second operation valve group 22 is opened, the rock gas gaseous sample flows into the second dust catching device 22 by the second operation valve group 24, the described second dust catching device 22 filters the dust of collecting in the described rock gas gaseous sample, to be used for the sample detecting analysis.Like this, can only carry out dust catching during each the sampling with a dust catching device, after capturing dust, this dust catching device switches to another dust catching device, finish the dust trapping device that the dust catching device that captures operation then detachably gets off and more renews, thereby play the effect that dust captures continuously, guaranteed the continuity of sampling.But the present invention also is not limited thereto, and can also be arranged in parallel three or more dust catching devices as required, as long as guarantee that wherein a dust catching device can filter the dust of collecting in the described rock gas gaseous sample.
Further, the described first operation valve group 23 comprises first operation valve 231 and second operation valve 232, described first operation valve 231 is connected by pipeline with the entrance point of the described first dust catching device 21, described second operation valve 232 is connected by pipeline with the endpiece of the described first dust catching device 21, promptly first operation valve 231 and second operation valve 232 are separately positioned on the rear and front end of the first dust catching device 21, play the conducting of 21 connecting lines of the control first dust catching device or the effect that ends; The described second operation valve group 24 comprises the 3rd operation valve 241 and the 4th operation valve 242, described the 3rd operation valve 241 is connected with the entrance point of the described second dust catching device 22, and described the 4th operation valve 242 is connected with the endpiece of the described second dust catching device 22; Promptly the 3rd operation valve 241 and the 4th operation valve 242 are separately positioned on the rear and front end of the second dust catching device 22, play the conducting of 22 connecting lines of the control second dust catching device or the effect that ends.Like this, when first operation valve 231 and 232 unlatchings of second operation valve, the 3rd operation valve 241 and the 4th operation valve 242 are closed, this moment first, dust catching device 21 filtered the dust of collecting in the rock gas gaseous sample, and the second dust catching device, 22 no rock gas gaseous samples pass through, and the second dust catching device 22 is not worked.Otherwise, when the 3rd operation valve 241 and 242 unlatchings of the 4th operation valve, first operation valve 231 and second operation valve 232 are closed, this moment second, dust catching device 22 filtered the dust of collecting in the rock gas gaseous sample, and the first dust catching device, 21 no rock gas gaseous samples pass through, and the first dust catching device 21 is not worked.Can control the first dust catching device 21 and the second dust catching device, 22 alternately operatings so more effectively, thereby further guarantee the continuity of sampling.
Further, between described first dust catching device 21 and described second operation valve 232, be provided with first pressure transducer 81; Between described second dust catching device 22 and described the 4th operation valve 242, be provided with second pressure transducer 82, be used for the monitoring rock gas gaseous sample pressure of introducing, thereby help improving the safe reliability of equipment.
Further, described metering with regulate the 3rd pressure transducer 83 and first temperature sensor 85 that subsystem 3 also is included in the setting of connecting between described flow control valve 31 and the described flow transmitter 32, be used to monitor the pressure and temperature of rock gas gaseous sample after passing through flow control valve 31, thereby guarantee the accuracy of measurement.
Further, described emptying subsystem 4 also is included in the 4th pressure transducer and second temperature sensor 86 of connecting and being provided with between described reduction valve 41 and the described non-return valve 43, be used to monitor pressure and temperature, thereby further guarantee the accuracy of measurement by reduction valve 41 post-decompression rock gas gaseous samples.
Further, between pipeline 5 that connects described reduction valve 41 entrance points and described blowdown piping 7, be connected with first connecting line 91, make the residual high-pressure natural gas gas of reduction valve 41 entrance points one side to enter blowdown piping 7 by first connecting line 91; Between pipeline that is connected in described non-return valve 43 entrance points and described first connecting line 91, be connected with second connecting line 92, be used for the high-pressure natural gas gas that non-return valve 43 entrance points one side is residual and enter blowdown piping 7 by second connecting line 92 and first connecting line 91; On described first connecting line 91, be provided with the 5th operation valve 87, be used to control the conducting of described first connecting line 91 or end; On described second connecting line 92, be provided with the 6th operation valve 88, be used to control the conducting of described second connecting line 92 or end.Like this, make the entrance point one side residual gas dispatch of reduction valve 41 and non-return valve 43, thereby improved the safe reliability of system's operation to blowdown piping 7.
In addition, on the pipeline between described five operation valves 87 and the described blowdown piping 7, be provided with spark arrester 93 and exhaust box 94, play the effect of back-fire relief and noise reduction.
In the present invention, flow control valve, flow transmitter, pressure transducer, temperature sensor, operation valve, reduction valve, gate valve, non-return valve are prior art, are not described in detail at this.Described first operation valve 231, second operation valve 232, the 3rd operation valve 241, the 4th operation valve 242, the 5th operation valve 87, the 6th operation valve 88 all can adopt ball valve.But the present invention also is not limited thereto, and above-mentioned operation valve also can adopt other known operation valves, as long as the purpose that can play the pilot piping conducting and end.
The present invention also provides the dust off-line method of sampling in a kind of open loop type high pressure gas pipeline, and as shown in Figure 1, 2, this method of sampling comprises:
The sampling mouth 11 of sampled subsystem imports gathers the rock gas gaseous sample in the high pressure gas pipeline 6, and with in this rock gas gaseous sample import system pipeline 5;
Adjusting is arranged on the metering and the flow control valve 31 of regulating subsystem 3 in the system pipeline 5, makes the sample rate of sampling mouth 11 equal the rock gas flow velocity of sample point in the natural gas line 6, moving sampling such as to reach;
By one in two the dust catching devices 21,22 that are arranged in parallel of dust catching subsystem 2, filter to collect and press contained dust in the rock gas;
Carry out flow metering by metering and 32 pairs of described rock gas gaseous samples of flow transmitter of regulating subsystem 3, whether the check sampling flow moving sampling such as satisfies, and as moving sampling such as satisfying, the maintenance system continues operation; Otherwise, regulate flow control valve 31, until moving sampling request flow such as reaching;
Rock gas gaseous sample behind process dust catching subsystem 2 and metering and the adjusting subsystem 3 is decompressed to setup pressure value by the reduction valve 41 of emptying subsystem 4, enters blowdown piping 7 again, thereby finishes the off-line sampling process of the interior dust of natural gas line.
Further, described dust catching subsystem 2 comprises the first dust catching device 21 and the second dust catching device 22 that is arranged in parallel, the described first dust catching device 21 is connected with the first operation valve group 23, and the described second dust catching device 22 is connected with the second operation valve group 24; Wherein, described of stating in the dust catching device that is arranged in parallel, filter to collect and press the step of contained dust in the rock gas further to comprise:
When the described first operation valve group 23 is in opening, the described second operation valve group 24 is closed, the described first dust catching device 21 filters the dust of collecting in the described rock gas gaseous sample, do not have rock gas gaseous sample to flow through in the described second dust catching device 22 this moment, and the second dust catching device 22 is not worked; And when the described first operation valve group 23 is in closed condition, the described second operation valve group 24 is opened, the described second dust catching device 22 filters the dust of collecting in the described rock gas gaseous sample, do not have rock gas gaseous sample to flow through in the described first dust catching device 21 this moment, and the first dust catching device 21 is not worked.Like this, the first dust catching device 21 and the second dust catching device, 22 alternately operatings can be changed parts in turn, thereby have guaranteed the continuity that adopts.
Concrete installation process of the present invention is: pipeline adapter 12 is connected with high pressure gas pipeline 6, sampling mouth 11 is connected with flange 13, sampling mouth 11 is taken over 12 by pipeline and is inserted high pressure gas pipeline 6, and be connected and fixed by flange 13, valve 14 front ends are connected in sampling mouth 11 rear ends, and valve 14 rear ends are connected with dust catching subsystem 2; Intrasystem first operation valve of dust catching 231 rear ends are connected with 21 imports of the first dust catching device, 21 outlets of the first dust catching device are connected with second operation valve, 232 front ends, between the first dust catching device 21 and second operation valve 232 first pressure transducer 81 are installed; The 3rd operation valve 241 rear ends are connected with 22 imports of the second dust catching device, 22 outlets of the second dust catching device are connected with the 4th operation valve 242 front ends, second pressure transducer, 82, the second operation valves 232 are installed between the second dust catching device 22 and the 4th operation valve 242 to be connected metering and to regulate subsystem 3 with the rear end of the 4th operation valve 242; Flow control valve 31 front ends link to each other with dust catching system 2, flow control valve 31 rear ends are connected with flow transmitter 32, the 3rd pressure transducer 83 and first temperature sensor 85 are installed between flow control valve 31 and flow transmitter 32, and flow transmitter 32 outlets are connected with emptying subsystem 4; Reduction valve 41 front ends link to each other with adjusting subsystem 3 with metering, and reduction valve 41 rear ends are connected with gate valve 42, and the 4th pressure transducer 84 and second temperature sensor 86 are installed between reduction valve 41 and gate valve 42, and gate valve 42 rear ends connect non-return valve 43; On first connecting line 91, be provided with the 5th operation valve 87, the rear end of the 5th operation valve 87 connects spark arrester 93, sound suppressor 94, on second connecting line, be provided with the 6th operation valve 88, the six operation valves 88 rear ends and link to each other, so just finished the assembling of whole employing system with the front end of gate valve 21.
Specific operation process of the present invention is: high pressure dust-laden rock gas is opened the first operation valve group 23 by the sampling system extraction, and the rock gas gaseous sample flows into the first dust catching device 21, and dust is filtered capture in the gaseous sample; Open second operation valve 232, gas stream inflow-rate of water turbine transmitter 32 carries out flow metering, according to the flow that records, calculate flow velocity, regulate flow control valve 31, make the sampling flow velocity equal the rock gas flow velocity of sample point in the pipeline, metering back gas stream is decompressed to emptying requirement pressure through reduction valve 41, behind the 4th pressure transducer 84 and second temperature sensor, 86 detected gas pressure and temperatures, enter blowdown piping by non-return valve 43.In addition, before the reduction valve 41 and before the non-return valve 43 residual gas by opening the 5th operation valve 87 and the 6th operation valve 88, residual gas flow through spark arrester 93, sound suppressor 94 back emptying.
The above only is the schematic embodiment of the present invention, is not in order to limit scope of the present invention.Any those skilled in the art, equivalent variations of having done under the prerequisite that does not break away from design of the present invention and principle and modification all should belong to the scope of protection of the invention.
Claims (10)
1. the interior dust off-line sampling system of open loop type high pressure gas pipeline is characterized in that, described sampling system is connected in series successively by pipeline and is formed by sampled subsystem, dust catching subsystem, metering and adjusting subsystem and emptying subsystem, wherein:
Described sampled subsystem comprises tubulose sampling mouth at least, stretches in the high pressure gas pipeline, to introduce the rock gas gaseous sample;
Described dust catching subsystem, comprise two dust catching devices that are arranged in parallel, each described dust catching device is connected with an operation valve group, described operation valve control linkage respectively makes one of them of described two dust catching devices can filter the dust of collecting in the described rock gas gaseous sample in the conducting of the pipeline of corresponding dust catching device or end;
Described metering and adjusting subsystem comprise flow control valve and flow transmitter at least, and described flow control valve and described flow transmitter are connected in series, and described flow control valve is connected with described dust catching subsystem;
Described emptying subsystem comprises reduction valve, gate valve and the non-return valve of serial connection successively at least, and described reduction valve is connected with described flow transmitter, and described non-return valve connects blowdown piping.
2. dust off-line sampling system in the open loop type high pressure gas pipeline as claimed in claim 1 is characterized in that described sampled subsystem also comprises:
Pipeline is taken over, and the one end is fixed in the outside of the thief hatch on the natural gas line, and described sampling mouth is taken over by described pipeline and stretched in the described high pressure gas pipeline;
Flange, this flange is connected with the other end that described pipeline is taken over, and described flange is sheathed on the outside of a sleeve pipe, and described sleeve pipe is inserted in the described pipeline adapter, described sampling mouth wears and is fixed in described sleeve pipe, and described flange fixed cover is located on the described sleeve outer wall;
Valve is located between described sampling mouth and the described dust catching subsystem, is used to control the unlatching of described sampling mouth or close.
3. dust off-line sampling system in the open loop type high pressure gas pipeline as claimed in claim 1, it is characterized in that, described dust catching subsystem comprises the first dust catching device and the second dust catching device that is arranged in parallel, the described first dust catching device is connected with the first operation valve group, and the described second dust catching device is connected with the second operation valve group; When the described first operation valve group was in opening, the described second operation valve group was closed, and the described first dust catching device filters the dust of collecting in the described rock gas gaseous sample; And when the described first operation valve group was in closed condition, the described second operation valve group was opened, and the described second dust catching device filters the dust of collecting in the described rock gas gaseous sample.
4. dust off-line sampling system in the open loop type high pressure gas pipeline as claimed in claim 3, it is characterized in that, the described first operation valve group comprises first operation valve and second operation valve, described first operation valve is connected with the entrance point of the described first dust catching device, and described second operation valve is connected with the endpiece of the described first dust catching device; The described second operation valve group comprises the 3rd operation valve and the 4th operation valve, and described the 3rd operation valve is connected with the entrance point of the described second dust catching device, and described the 4th operation valve is connected with the endpiece of the described second dust catching device.
5. dust off-line sampling system in the open loop type high pressure gas pipeline as claimed in claim 4 is characterized in that, is provided with first pressure transducer between described first dust catching device and described second operation valve; Between described second dust catching device and described the 4th operation valve, be provided with second pressure transducer.
6. dust off-line sampling system in the open loop type high pressure gas pipeline as claimed in claim 1, it is characterized in that, described metering with regulate pressure transducer and the temperature sensor that subsystem also is included in the setting of connecting between described flow control valve and the described flow transmitter.
7. dust off-line sampling system in the open loop type high pressure gas pipeline as claimed in claim 1 is characterized in that, described emptying subsystem also is included in the pressure transducer and the temperature sensor of the setting of connecting between described reduction valve and the described non-return valve.
8. dust off-line sampling system in the open loop type high pressure gas pipeline as claimed in claim 7, it is characterized in that, between pipeline that connects described reduction valve entrance point and described blowdown piping, be connected with first connecting line, between pipeline that is connected in described check valve inlet end and described first connecting line, be connected with second connecting line; On described first connecting line, be provided with the 5th operation valve; On described second connecting line, be provided with the 6th operation valve.
9. the dust off-line method of sampling in the open loop type high pressure gas pipeline, it is characterized in that, the described method of sampling comprises: by pipeline be connected in series sampled subsystem, dust catching subsystem successively, metering constitutes sampling system with adjusting subsystem and emptying subsystem
Tubulose sampling mouth is set in described sampled subsystem, makes described sampling mouth import in the high pressure gas pipeline, with collection rock gas gaseous sample, and with in this rock gas gaseous sample import system pipeline;
In described metering and adjusting subsystem, flow control valve and flow transmitter are set, described flow control valve and described flow transmitter are connected in series, described flow control valve is connected with described dust catching subsystem, adjusting is arranged on the metering and the flow control valve of regulating subsystem in the system pipeline, make the sample rate of sampling mouth equal the rock gas flow velocity of sample point in the natural gas line, moving sampling such as to reach;
In described dust catching subsystem, two dust catching devices that are arranged in parallel, each described dust catching device is connected with an operation valve group, described operation valve control linkage respectively makes one of them of described two dust catching devices can filter the dust of collecting in the described rock gas gaseous sample in the conducting of the pipeline of corresponding dust catching device or end;
By metering and the flow transmitter of regulating subsystem described rock gas gaseous sample is carried out flow metering, whether the check sampling flow moving sampling such as satisfies, and as moving sampling such as satisfying, the maintenance system continues operation; Otherwise, regulate flow control valve, until moving sampling request flow such as reaching;
In described emptying subsystem, serial connection is provided with reduction valve, gate valve and non-return valve successively, described reduction valve is connected with described flow transmitter, described non-return valve connects blowdown piping, rock gas gaseous sample behind feasible process dust catching subsystem and metering and the adjusting subsystem reduces to setup pressure value by the reduction valve pressure of emptying subsystem, enters blowdown piping again.
10. the dust off-line method of sampling in the open loop type high pressure gas pipeline as claimed in claim 9, it is characterized in that, described dust catching subsystem comprises the first dust catching device and the second dust catching device that is arranged in parallel, the described first dust catching device is connected with the first operation valve group, and the described second dust catching device is connected with the second operation valve group; Wherein, described of stating in the dust catching device that is arranged in parallel, filter to collect and press the step of contained dust in the rock gas further to comprise:
When the described first operation valve group was in opening, the described second operation valve group was closed, and the described first dust catching device filters the dust of collecting in the described rock gas gaseous sample; And when the described first operation valve group was in closed condition, the described second operation valve group was opened, and the described second dust catching device filters the dust of collecting in the described rock gas gaseous sample.
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| CN 201110088372 CN102230855A (en) | 2011-04-08 | 2011-04-08 | Dust off-line sampling system in open-loop high-pressure natural gas pipeline and sampling method thereof |
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