CN111842292A - Surface impurity removal system and method for gas field flow measuring device - Google Patents
Surface impurity removal system and method for gas field flow measuring device Download PDFInfo
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- CN111842292A CN111842292A CN202010705025.7A CN202010705025A CN111842292A CN 111842292 A CN111842292 A CN 111842292A CN 202010705025 A CN202010705025 A CN 202010705025A CN 111842292 A CN111842292 A CN 111842292A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/12—Cleaning arrangements; Filters
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Abstract
The invention discloses a surface impurity removing system for a gas field flow measuring device, which comprises a main system, a dust collecting device and a dust collecting device, wherein the main system comprises a pipeline module and a control module, the pipeline module comprises a first air inlet pipe, a measuring loop, a dust outlet pipe and a first air outlet pipe, the first air inlet pipe is connected with the measuring loop at a first interface, the dust outlet pipe is connected with the measuring loop at a second interface, and the first air outlet pipe is connected with a third interface at the middle part of the dust outlet pipe; the measuring loop comprises a switching tube and a detecting tube, and the detecting tube is communicated with a fourth interface and a fifth interface on the switching tube; the standby system is started when the main system fails by switching between the main system and the standby system, so that the purpose of uninterrupted measurement is achieved; the flow can be measured while the impurities are cleaned, and the cleaning effect is more excellent by utilizing the bidirectional impurity removing method.
Description
Technical Field
The invention relates to the technical field of gas field measurement, in particular to a surface impurity removing system and method for a gas field flow measuring device.
Background
With the enhancement of global environmental awareness, people have higher and higher requirements on energy, and the excessive use of traditional energy sources such as coal, petroleum and the like brings great pollution to the environment, so that the demand of China on clean energy is continuously increased, and the exploration and development of oil-gas fields, natural gas fields and the like are more emphasized. In the process of gas field exploitation, the oil gas and the natural gas which are exploited are accurately measured, the safe and reliable gas transmission is ensured, scientific and accurate data are provided for later exploitation and resource allocation, and the use of a flow measurement device is required.
The flow measuring device that current gas field used is many kinds, wherein with the application of orifice plate flowmeter most extensive, but the gas of following gas field exploitation production is mostly the gas-solid mixture, and the impurity that contains in the gas is more, and measurement system long-time operation back flowmeter surface can be because of the impurity adheres to and the scale deposit, reduces the measurement accuracy of flowmeter by a wide margin.
The chapter man et al (chapter man, poplar, automation and instrumentation) consider that when the natural gas produced is measured by an orifice flowmeter, impurities are easily adsorbed on the surface of the orifice flowmeter to form dirt, so that the flow area of the orifice becomes small, thereby causing an increase in differential pressure, and the measurement accuracy of the flowmeter is affected by making the measurement value of the flowmeter greater than an actual value. The factors and the countermeasures [ J ] metering and testing technology, 2019,46(06):73-75 ] influencing the accuracy of the natural gas flow measured by a standard orifice plate flowmeter are considered by the clouds (the fortune, the shallow talk) that the actual gas supply quantity of the flowmeter is lower than the design flow, the pipe diameter Reynolds number of the natural gas fluid in operation is smaller, according to the fluid dynamics principle, the smaller the Reynolds number of the natural gas pipe diameter is, the weaker the proton and the particle diffusion in the natural gas pipe diameter is, the solid particles are condensed to form two-phase flow, the method has the advantages that dust or other impurities are inevitably deposited on the surface of the flowmeter during operation, the influence of the dust impurities on the orifice plate flowmeter is reduced by using a method of dedusting natural gas and regularly checking and maintaining the orifice plate so as to ensure the accuracy of a measuring result, however, in the natural gas dust removal process, the impurities cannot be completely removed, and the impurities which are not removed can be continuously adsorbed on the surface of the flowmeter to influence the measurement precision; li political affairs et al (Li politics, splendid spring, Luoyao, Pengyjuan, Wei. Standard orifice plate flowmeter measures natural gas flow and measures additional error analysis [ J ] China measurement, 2010(06):97-99.) also propose to use the regular method of checking and cleaning the flowmeter to solve the influence of surface impurity on the measurement, but the regular check-up need take out to carry out the precision check-up work to the orifice plate flowmeter, need to revise the whole measurement system again, there are check-up work complicacy, check-up cycle is long, can't carry on the problem such as measuring of continuous exploitation to the gas field. Danglili (Li Zheng, Danglili, sungloraw. Standard orifice plate flowmeter measures natural gas flow and measures additional error analysis [ J ]. oil industry technical supervision, 2009,25(09):44-46.) et al propose that impurities carried in gas can be removed by using a filtering mode, but only part of impurities can be removed by using a filter impurity removal method, the impurities with smaller particle size cannot be completely removed, and the impurities with smaller particle size still form scales on the surface of the flowmeter after the system runs for a long time. Liu Sho (patent name: apparatus for cleaning mass flow meter structure; application number: 201420483643.1) and Zhang Jun (patent name: cleaning equipment for mass flow meter of tobacco sheet concentrated solution; application number: 201621396351.X) propose that the dirt of the mass flow meter can be removed by chemical reaction method, but if the impurities are removed by mutual reaction between chemical substances, the amount of the put chemical substances is difficult to determine, if the put chemical substances are too little, the dirt is difficult to be completely removed, and if the put chemical substances are too much, the residual chemical substances can influence the physicochemical property of the measured medium and influence the measured medium; on the other hand, when the chemical reaction method is used, the measurement system must be closed, and uninterrupted metering of the system is difficult to realize.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the invention of this application some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made keeping in mind the above problems occurring in the prior art and/or the problems occurring in the prior art.
Therefore, the invention aims to solve the technical problems that the scale deposit of the flow meter in the existing metering equipment is difficult to clean, the system needs to be stopped for maintenance when the system fails, the uninterrupted metering cannot be realized, and the cleaning effect is poor.
In order to solve the technical problems, the invention provides the following technical scheme: a surface contaminant removal system for a gas field flow measurement device, comprising,
the main system comprises a pipeline module and a control module, wherein,
the pipeline module comprises a first air inlet pipe, a measuring loop, a dust outlet pipe and a first air outlet pipe, wherein the first air inlet pipe is connected with the measuring loop at a first interface, the dust outlet pipe is connected with the measuring loop at a second interface, and the first air outlet pipe is connected with a third interface at the middle part of the dust outlet pipe;
The measuring loop comprises a switching tube and a detecting tube, and the detecting tube is communicated with a fourth interface and a fifth interface on the switching tube;
the control module comprises a first valve, a second valve, a third valve and a fourth valve, the first valve is arranged on the first air inlet pipe, the second valve is arranged between the first connector and the fourth connector, and the fourth valve is arranged on the first air outlet pipe;
the descaling module comprises a cleaning pump, a waste tank and a connecting pipe, wherein the cleaning pump is communicated with the second interface through the connecting pipe, the waste tank is arranged at the tail end of the dust outlet pipe, and a third valve is arranged between the waste tank and the third interface.
As a preferable aspect of the surface impurity removal system for a gas field flow rate measuring device of the present invention, wherein: and a flowmeter is arranged in the detection pipe, and is arranged in the middle area of the first interface and the fifth interface.
As a preferable aspect of the surface impurity removal system for a gas field flow rate measuring device of the present invention, wherein: the distance from the fourth interface to the second interface is equal to the distance from the fifth interface to the second interface.
As a preferable aspect of the surface impurity removal system for a gas field flow rate measuring device of the present invention, wherein: an adjusting pipe is arranged in the switching pipe, one end of the adjusting pipe is communicated with the connecting pipe, and the other end of the adjusting pipe is connected with one end, located at the fourth interface or the fifth interface, of the detection pipe.
As a preferable aspect of the surface impurity removal system for a gas field flow rate measuring device of the present invention, wherein: also comprises the following steps of (1) preparing,
the standby system is consistent with the main system in structure, wherein a second air inlet pipe in the standby system is communicated with the first air inlet pipe, and a fifth valve is arranged on the second air inlet pipe;
and a second air outlet pipe in the standby system is communicated with the first air outlet pipe, and a sixth valve is arranged on the second air outlet pipe.
A surface impurity removal method using the surface impurity removal system for a gas field flow rate measurement device described above:
when the main system works, the fifth valve and the sixth valve are closed, the first valve on the first air inlet pipe and the fourth valve on the first air outlet pipe are opened, and the main system is selected to work;
the measured flow is conveyed to the air inlet, and a valve of the control module is adjusted to enable the measured flow to pass through the flowmeter;
Switching a valve switch, closing the first valve and the fourth valve, opening the fifth valve and the sixth valve, selecting a standby system to work, and cleaning the main system;
starting a cleaning pump, conveying scouring fluid into the measuring loop, and adjusting the positions of a valve switch of the control module and the adjusting pipe to enable the scouring fluid to positively pass through the flowmeter;
the position of the valve switch of the control module and the position of the regulating pipe are adjusted to enable the flushing fluid to reversely pass through the flowmeter.
As a preferable aspect of the method for removing surface impurities for a gas field flow rate measuring device of the present invention, wherein: the flushing fluid is a gas or a liquid.
As a preferable aspect of the method for removing surface impurities for a gas field flow rate measuring device of the present invention, wherein: the main system works, and the on-off condition of the valve of the measured flow passing through the flow meter is as follows:
the first valve and the fourth valve are opened and the third valve and the fourth valve are closed.
As a preferable aspect of the method for removing surface impurities for a gas field flow rate measuring device of the present invention, wherein: the valve on-off condition that the flushing fluid is passing through the flowmeter in the forward direction is as follows:
the third valve and the fourth valve are opened, and the first valve and the fourth valve are closed;
One end of the adjusting pipe is communicated with the connecting pipe, and the other end of the adjusting pipe is connected with the detecting pipe and is positioned at one end of the fourth interface.
As a preferable aspect of the method for removing surface impurities for a gas field flow rate measuring device of the present invention, wherein: the valve on-off condition that the flushing fluid is passing through the flowmeter in the forward direction is as follows:
the third valve and the fourth valve are opened, and the first valve and the fourth valve are closed;
one end of the adjusting pipe is communicated with the connecting pipe, and the other end of the adjusting pipe is connected with one end, located at the fifth interface, of the detecting pipe.
As a preferable aspect of the surface impurity removing system and method for a gas field flow rate measuring device according to the present invention, wherein: and a second fixing hole is also formed in the side surface of the support frame, and the position of the second fixing hole corresponds to that of the first fixing hole.
The invention has the beneficial effects that: the standby system is started when the main system fails by switching between the main system and the standby system, so that the purpose of uninterrupted measurement is achieved; the flow can be measured while the impurities are cleaned, and the cleaning effect is more excellent by utilizing the bidirectional impurity removing method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
Fig. 1 is a schematic overall structure diagram of a main system in a surface impurity removal system for a gas field flow rate measurement device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a measurement circuit in a surface contaminant removal system for a gas field flow rate measurement device according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a connection structure of a primary system and a backup system in a surface impurity removal system for a gas field flow rate measurement device according to an embodiment of the present invention;
FIG. 4 is a schematic view illustrating a flow direction of a flushing fluid in a forward direction through a flowmeter in a surface impurity removal method for a gas field flow rate measurement device according to an embodiment of the present invention;
fig. 5 is a schematic view illustrating a flow direction of a flushing fluid reversely passing through a flowmeter in a surface impurity removal method for a gas field flow rate measurement device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration when describing the embodiments of the present invention, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 to 3, the present embodiment provides a surface impurity removal system for a gas field flow rate measuring device, including,
the master system S1, including the line module 100 and the control module 200, wherein,
the pipeline module 100 comprises a first air inlet pipe 101, a measurement loop 102, a dust outlet pipe 103 and a first air outlet pipe 104, wherein the first air inlet pipe 101 is connected with the measurement loop 102 at a first interface A, the dust outlet pipe 103 is connected with the measurement loop 102 at a second interface B, and the first air outlet pipe 104 is connected with a third interface C in the middle of the dust outlet pipe 103;
The measurement circuit 102 comprises a switching tube 102a and a detection tube 102b, and the detection tube 102b is communicated with a fourth interface D and a fifth interface E on the switching tube 102 a;
the control module 200 comprises a first valve 201, a second valve 202, a third valve 203 and a fourth valve 204, wherein the first valve 201 is arranged on the first air inlet pipe 101, the second valve 202 is arranged between the first connector A and the fourth connector D, and the fourth valve 204 is arranged on the first air outlet pipe 104;
A flowmeter 102c is arranged in the detection pipe 102b, and the flowmeter 102c is arranged in the middle area between the first port A and the fifth port E.
The distance from the fourth interface D to the second interface B is equal to the distance from the fifth interface E to the second interface B.
An adjusting pipe 102D is arranged in the switching pipe 102a, one end of the adjusting pipe 102D is communicated with the connecting pipe 303, and the other end of the adjusting pipe 102D is connected with the detecting pipe 102b and is positioned at one end of the fourth interface D or the fifth interface E.
Also comprises the following steps of (1) preparing,
the standby system S2 is characterized in that the standby system S2 is consistent with the main system S1 in structure, wherein a second air inlet pipe 501 in the standby system S2 is communicated with the first air inlet pipe 101, and a fifth valve 502 is arranged on the second air inlet pipe 301;
The second outlet pipe 601 in the standby system S2 is communicated with the first outlet pipe 104, and the sixth valve 602 is arranged on the second outlet pipe 601.
The adjusting tube 102D can adjust its position to switch its connection object, and it should be noted that the adjusting tube 102D can move in the switching tube 102a, if the adjusting tube 102D is connected to the connection tube 303 at the beginning, the other end of the adjusting tube 102D is connected to the detection tube 102b and is located at one end of the fourth interface D, one end of the adjusting tube 102D is connected to the connection tube 303 after moving, and the other end of the adjusting tube 102D is connected to the detection tube 102b and is located at one end of the fifth interface E.
The invention provides a surface impurity removing system of a gas field flowmeter.
The whole system adopts two sets of same flow measuring devices which are connected in parallel, namely a main system S1 and a standby system S2, wherein one of the main system and the standby system is used for working state, the other one is standby, the two sets of systems have the same structure and share one air inlet, and which set of system is selected to be in the working state is determined by controlling the on-off of a first valve 201, a fourth valve 204, a fifth valve 501 and a sixth valve 601. Each set of system can realize the flow measurement while impurity clearance.
The flowmeter 102c adopts an olive-shaped differential pressure type flowmeter, and can realize bidirectional flow metering due to a symmetrical structure; and the impurities are removed in a valve bidirectional mode, so that the impurities attached to the surface of the flowmeter can be cleaned in the forward and backward directions, any external auxiliary equipment is not required to be added, and the measurement internal space and the cost are saved.
Example 2
The embodiment provides a surface impurity removal method for a gas field flow measurement device, which is implemented by using the surface impurity removal system for the gas field flow measurement device, and the method specifically comprises the following steps:
in the working state of the main system S1, the fifth valve 502 and the sixth valve 602 are closed, the first valve 201 on the first inlet pipe 101 and the fourth valve 204 on the first outlet pipe 104 are opened, and the main system S1 is selected to work;
delivering the measured flow to the inlet, and adjusting the valve of the control module 200 to enable the measured flow to pass through the flow meter 102 c;
switching valve switches, closing the first valve 201 and the fourth valve 204, opening the fifth valve 502 and the sixth valve 602, selecting the standby system S2 to work, and cleaning the main system S1;
starting the cleaning pump 301, delivering a flushing fluid to the measurement loop 102, and adjusting the positions of the valve switch of the control module 200 and the regulating pipe 102d to enable the flushing fluid to pass through the flow meter 102c in the forward direction;
adjusting the valve switch of the control module 200 and the position of the regulator tube 102d reverses the direction of the flushing fluid through the flow meter 102 c.
The flushing fluid is a gas or a liquid.
The gas may be air and the liquid may be oil for circulation of the flushing.
The master system S1 is operating, and the valve on-off conditions when the measured flow passes through the flow meter 102c are:
the first valve 201 and the fourth valve 204 are opened and the second valve 202 and the third valve 203 are closed.
The valve on/off condition for flushing fluid passing forward through the flow meter 102c is:
the second valve 202 and the third valve 203 are opened, and the first valve 201 and the fourth valve 204 are closed;
one end of the adjusting tube 102D is connected to the connecting tube 303, and the other end of the adjusting tube 102D is connected to the detecting tube 102b and is located at one end of the fourth port D.
The valve on/off condition for flushing fluid passing forward through the flow meter 102c is:
the second valve 202 and the third valve 203 are opened, and the first valve 201 and the fourth valve 204 are closed;
one end of the adjusting tube 102d is connected to the connecting tube 303, and the other end of the adjusting tube 102d is connected to the detecting tube 102b and is located at one end of the fifth interface E.
When the device is used, the device is divided into two states, namely a working state and a cleaning state, and flow direction conditions of forward measurement through the flowmeter 102c and reverse measurement through the flowmeter 102c are respectively shown in fig. 1 and fig. 2.
Cleaning state the present invention utilizes a valve bi-directional removal method to achieve bi-directional cleaning of the flow meter by switching the flushing fluid forward and backward through the flow meter 102 c.
And the system comprises a main system S1 and a standby system S2, and through valve switching, the measurement can be continued by using the standby system S2 when the main system S1 needs to be cleaned, and meanwhile, the flow meter in the main system S1 is flushed and descaled, so that the system can continuously work.
When the existing measuring device is used for cleaning, the system needs to be closed, the flowmeter is detached for cleaning, working hours are wasted, and cleaning work is complicated.
The effectiveness of the descaling work by utilizing the system can be verified by the following modes:
the olive-shaped flowmeter is a differential pressure flowmeter, the flow is mainly calculated according to the differential pressure measured before and after, and the formula (1) shows that:
in the formula, qvIs the volume flow of the fluid, m3S; d is the diameter of the measuring tube, m; d is the diameter of the flowmeter, m;
beta is the ratio of the diameters of the two,
dimensionless; Δ P is the differential pressure, pa; ρ is the density of the fluid, kg/m 3; c is an outflow coefficient, is dimensionless and is determined by experiments;
when dirt is attached to the surface of the flowmeter, the flow area in the pipe changes, the flow speed changes, the differential pressure changes, and finally errors exist in flow measurement. Under the working conditions that the pipe diameter D is 50mm and the flow speed v is 0.28m/s, the differential pressure delta p of the olive-shaped flowmeter is 253Pa, and when the thickness of dirt attached to the surface of the flowmeter is 1mm after long-time operation, the differential pressure delta p' is 258.34Pa, the flow measurement precision is influenced, and therefore the surface of the flowmeter needs to be descaled.
Through experimental detection, when the high-speed airflow is used for carrying out unidirectional blowing on the flowmeter, the differential pressure before and after the flowmeter is monitored while blowing, dirt on the surface of the flowmeter opposite to an airflow inlet cannot be completely removed, the differential pressure is 255.42Pa, and the differential pressure cannot be completely recovered to the differential pressure without the dirt.
When the flow meter is subjected to forward and reverse bidirectional blowing by the high-speed airflow, the differential pressure Δ p can be restored to 253.11pa, that is, the differential pressure Δ p is almost equal to the differential pressure when the flow meter is not contaminated at first, and it can be seen that the contamination is completely removed so as not to affect the measurement of the flow meter.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A surface impurity removal system for a gas field flow measurement device, characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
A master system (S1) including a line module (100) and a control module (200), wherein,
the pipeline module (100) comprises a first air inlet pipe (101), a measuring loop (102), a dust outlet pipe (103) and a first air outlet pipe (104), wherein the first air inlet pipe (101) is connected with the measuring loop (102) at a first interface (A), the dust outlet pipe (103) is connected with the measuring loop (102) at a second interface (B), and the first air outlet pipe (104) is connected with a third interface (C) in the middle of the dust outlet pipe (103);
the measurement circuit (102) comprises a switching tube (102a) and a detection tube (102b), the detection tube (102b) is communicated with a fourth interface (D) and a fifth interface (E) on the switching tube (102 a);
the control module (200) comprises a first valve (201), a second valve (202), a third valve (203) and a fourth valve (204), the first valve (201) is arranged on the first air inlet pipe (101), the second valve (202) is arranged between a first connector (A) and a fourth connector (D), and the fourth valve (204) is arranged on the first air outlet pipe (104);
the descaling device is characterized by further comprising a descaling module (300) which comprises a cleaning pump (301), a waste groove (302) and a connecting pipe (303), wherein the cleaning pump (301) is communicated with the second connector (B) through the connecting pipe (303), the waste groove (302) is formed in the tail end of the dust outlet pipe (103), and the third valve (203) is arranged between the waste groove (302) and the third connector (C).
2. The surface contaminant removal system for a gas field flow measurement device of claim 1, wherein: and a flow meter (102c) is arranged in the detection pipe (102b), and the flow meter (102c) is arranged in the middle area of the first interface (A) and the fifth interface (E).
3. The surface impurity removal system for a gas field flow rate measurement device according to claim 1 or 2, characterized in that: the distance from the fourth interface (D) to the second interface (B) is equal to the distance from the fifth interface (E) to the second interface (B).
4. The surface contaminant removal system for a gas field flow measurement device of claim 3, wherein: an adjusting pipe (102D) is arranged in the switching pipe (102a), one end of the adjusting pipe (102D) is communicated with the connecting pipe (303), and the other end of the adjusting pipe (102D) is connected with one end, located at the fourth interface (D) or the fifth interface (E), of the detecting pipe (102 b).
5. The surface contaminant removal system for a gas field flow measurement device of claim 4, wherein: also comprises the following steps of (1) preparing,
a standby system (S2), wherein the standby system (S2) is consistent with the main system (S1), a second air inlet pipe (501) in the standby system (S2) is communicated with the first air inlet pipe (101), and a fifth valve (502) is arranged on the second air inlet pipe (301);
And a second air outlet pipe (601) in the standby system (S2) is communicated with the first air outlet pipe (104), and a sixth valve (602) is arranged on the second air outlet pipe (601).
6. A surface impurity removing method using the surface impurity removing system for a gas field flow rate measuring device according to claim 6, characterized in that:
closing the fifth valve (502) and the sixth valve (602) in the working state of the main system (S1), opening the first valve (201) on the first air inlet pipe (101) and the fourth valve (204) on the first air outlet pipe (104), and selecting the main system (S1) to work;
delivering the measured flow to the air inlet, and adjusting a valve of the control module (200) to enable the measured flow to pass through the flowmeter (102 c);
switching a valve switch, closing the first valve (201) and the fourth valve (204), opening the fifth valve (502) and the sixth valve (602), selecting a standby system (S2) to work, and cleaning a main system (S1);
starting a cleaning pump (301), delivering a flushing fluid into the measurement loop (102), and adjusting the positions of a valve switch of the control module (200) and the regulating pipe (102d) to enable the flushing fluid to pass through the flow meter (102c) in the forward direction;
adjusting the valve switch of the control module (200) and the position of the regulator tube (102d) reverses the direction of the flushing fluid through the flow meter (102 c).
7. The surface impurity removal method for a gas field flow rate measurement device according to claim 6, characterized in that: the flushing fluid is a gas or a liquid.
8. The surface impurity removal method for a gas field flow rate measurement device according to claim 7, characterized in that: the master system (S1) operates, and the valve on-off conditions when the measured flow passes through the flow meter (102c) are:
the first valve (201) and the fourth valve (204) are open and the second valve (202) and the third valve (203) are closed.
9. The surface impurity removal method for a gas field flow rate measurement device according to claim 8, characterized in that: the valve on/off condition for flushing fluid passing forward through the flow meter (102c) is:
the second valve (202) and the third valve (203) are opened, and the first valve (201) and the fourth valve (204) are closed;
one end of the adjusting pipe (102D) is communicated with the connecting pipe (303), and the other end of the adjusting pipe (102D) is connected with one end of the detecting pipe (102b) which is positioned at a fourth interface (D).
10. The surface impurity removal method for a gas field flow rate measurement device according to claim 8 or 9, characterized in that: the valve on/off condition for flushing fluid passing forward through the flow meter (102c) is:
The second valve (202) and the third valve (203) are opened, and the first valve (201) and the fourth valve (204) are closed;
one end of the adjusting pipe (102d) is communicated with the connecting pipe (303), and the other end of the adjusting pipe (102d) is connected with one end of the detecting pipe (102b) which is positioned at a fifth interface (E).
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