CN105675067A - Circular pipeline full-area flow meter - Google Patents
Circular pipeline full-area flow meter Download PDFInfo
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- CN105675067A CN105675067A CN201610258140.8A CN201610258140A CN105675067A CN 105675067 A CN105675067 A CN 105675067A CN 201610258140 A CN201610258140 A CN 201610258140A CN 105675067 A CN105675067 A CN 105675067A
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- sampling
- static pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
-
- 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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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to the technical field of flue gas flow measurement equipment, and aims to provide a circular pipeline full-area flow meter which is not liable to block, clogging, high in measurement accuracy, long in life, stable and reliable. On the same cross section in the circular pipeline, two sets of sample tubes are orthogonally arranged, wherein each set of sample tube comprises a total pressure tube and a static pressure tube; the total pressure tubes and the static pressure tubes are arranged back to back; a plurality of total pressure sampling holes are formed in the total pressure tubes in the windward direction; a plurality of static pressure sampling holes are formed in the static pressure tubes in the opposite direction. The circular pipeline full-area flow meter is accurate in measurement result; a purging device is arranged to regularly purge the total pressure tubes, the static pressure tubes and various outlet pipes in the reverse direction, so that the circular pipeline full-area flow meter has the functions of preventing blockage and cleaning ashes, and is not liable to block, low in maintenance, stable, reliable, and long in service life; the flow meter can continuously and accurately measure the flue gas flow speed (flow rate) on line in the industrial waste gas pipeline which is of complex arrangement and disordered flow field to meet the requirement of the environmental protection department on online monitoring accuracy, continuity and reliability for exhaust emission.
Description
Technical field
The invention belongs to flue gas flow technical field of measuring equipment, particularly relate to a kind of circular pipe total cross-section effusion meter.
Background technology
At present, the general fashion that industrial waste gas flow velocity (flow) is measured is for adopting one sample point of tradition (point is measured) or several measurement point (line measurement) metering system, it only just can accurately measure flue gas flow when uniform flow field or relatively uniform flow field, if flow field uneven or disorderly when, point is measured and line is measured the mode of flow and all cannot accurately be measured the mean flow rate of this section. But at the industrial gas emission pipeline of the industries such as electric power, oil and chemical industry due to practical situations such as technique and space restrictions, exhaust piping is extremely difficult to the straight length measuring condition in uniform flow field or relatively uniform flow field, so conventional point is measured the mode with line measurement flow and all cannot be represented the average speed in discharge duct cross section, error of measured data is also bigger, it is typically in more than 10-20% according to on-the-spot actual Comparability test error, environmental administration cannot be met and carry out the requirement of on-line monitoring, also cannot as the foundation that blowdown enterprise is carried out collection of drainage dues.
CN1475776A discloses a kind of cross section effusion meter, static tube horizontal positioned, total head average tube erects arrangement in the middle part of flange, this total head average tube top left and right sides connects 4 ram-air pipes respectively, also another root ram-air pipe is connected in total head average tube right side central, this effusion meter, compared with some measurement, line metering system, improves the accuracy of measurement data. But this effusion meter is in actual use, easily blocks, maintenance workload is big, and fragile, service life is short, and owing to the arrangement of ram-air pipe, static tube is chaotic, measurement result yet suffers from the problem that error is big, accuracy is low.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of be not easily blocked, measurement accuracy height, long service life, reliable and stable circular pipe total cross-section effusion meter.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that
A kind of circular pipe total cross-section effusion meter, two groups of sampling tubes including quadrature arrangement, often group sampling tube includes ram-air pipe and static tube, ram-air pipe and static tube are arranged back-to-back, windward to offering some total head thieff hatchs on ram-air pipe, static tube offers some static pressure thieff hatchs in opposite direction, the two ends of ram-air pipe and static tube are connected with sampling block respectively, in sampling block, total head sampling cavity and static pressure sampling cavity are set, ram-air pipe, static tube respectively with total head sampling cavity, static pressure sampling cavity connects, one of them sampling block fixes sampling head, total head sampling passage is offered respectively in sampling head, static pressure sampling passage, total head sampling passage, static pressure sampling passage respectively with total head sampling cavity, static pressure sampling cavity connects, the total head sampling passage of sampling head, static pressure sampling passage is respectively through total head fairlead, static pressure fairlead is connected with differential pressure transmitter, total head fairlead, static pressure fairlead is respectively mounted measurement electromagnetic valve, total head fairlead, difference scavenging pipeline in parallel on static pressure fairlead, scavenging pipeline is installed blowback electromagnetic valve, scavenging pipeline is connected with blow device, often ram-air pipe in group sampling tube, the two ends of static tube are stationary positioned flange respectively, locating flange is fixing with flange sleeve to be connected.
Circular pipe total cross-section effusion meter of the present invention, further, another sidewall of described sampling block fixes standby sampling head.
Circular pipe total cross-section effusion meter of the present invention, further, on every described ram-air pipe, the quantity of total head thieff hatch is chosen as 4 or 6 or 8, and multiple total head thieff hatchs are symmetrical arranged with circular pipe centrage, and static pressure thieff hatch is equal with the quantity of total head thieff hatch and position is corresponding.
Circular pipe total cross-section effusion meter of the present invention, further, the internal diameter of described total head thieff hatch is 6mm or 8mm, and the static pressure thieff hatch of correspondence position is identical with the internal diameter of total head thieff hatch.
Circular pipe total cross-section effusion meter of the present invention, further, described blow device adopts air compressor.
Circular pipe total cross-section effusion meter of the present invention, further, described ram-air pipe and static tube adopt stainless steel tube.
Circular pipe total cross-section effusion meter of the present invention is compared with prior art, have the advantages that in circular pipe on same cross section, two groups of sampling tubes of quadrature arrangement, often group sampling tube includes ram-air pipe and static tube, ram-air pipe and static tube are arranged back-to-back, windward to offering some total head thieff hatchs on ram-air pipe, static tube offers some static pressure thieff hatchs in opposite direction, static pressure thieff hatch is equal with the quantity of total head thieff hatch and position is corresponding, the static pressure thieff hatch of correspondence position is identical with the internal diameter of total head thieff hatch, and sampling block and sampling head are set, when measuring gas flow, the average total head in this cross section measured by total head thieff hatch, the average static pressure on this cross section then measured by static pressure thieff hatch, namely cross section average discharge is drawn further according to Bernoulli equation after being calculated, measurement result is accurate, certainty of measurement up to ± 3% within, and blow device is set, regularly ram-air pipe and static tube and each fairlead are carried out reverse blow, possesses anti-blocking deashing function, it is not easily blocked, maintenance is little, reliable and stable, long service life, inventive flow meter can be continuous, complexity is arranged in accurate on-line measurement, flue gas flow rate (flow) in the industrial waste gas pipeline that flow field is disorderly, there are on-line measurement data continuous, accurately, the advantage that reliable and stable and working service amount is little, disclosure satisfy that toxic emission is carried out on-line monitoring accuracy by environmental administration, the requirement of seriality and reliability.
Below in conjunction with accompanying drawing, the circular pipe total cross-section effusion meter of the present invention is described further.
Accompanying drawing explanation
Fig. 1 is the overall diagram of circular pipe total cross-section effusion meter installment state of the present invention;
Fig. 2 is the front view of two groups of sampling tube parts in Fig. 1;
Fig. 3 is the sectional view of sampling tube part.
Detailed description of the invention
As shown in Figure 1-Figure 3, circular pipe total cross-section effusion meter of the present invention includes two groups of sampling tubes of quadrature arrangement, often group sampling tube includes ram-air pipe 1 and static tube 2, ram-air pipe 1 and static tube 2 adopt stainless steel tube, ram-air pipe 1 and static tube 2 are arranged back-to-back, windward to offering some total head thieff hatchs 11 on ram-air pipe 1, static tube 2 offers some static pressure thieff hatchs 21 in opposite direction. The present invention is mainly suitable for the circular pipe of internal diameter Φ 600mm-Φ 3000mm, internal diameter according to circular pipe determines the quantity of thieff hatch, internal diameter is more big, it is more many that quantity is set, on every ram-air pipe 1, the quantity of total head thieff hatch 11 is chosen as 4 or 6 or 8, multiple total head thieff hatchs 11 are symmetrical arranged with circular pipe 10 centrage, the internal diameter of total head thieff hatch 11 is preferably 6mm or 8mm, static pressure thieff hatch 21 is equal with the quantity of total head thieff hatch 11 and position is corresponding, and the static pressure thieff hatch 21 of correspondence position is identical with the internal diameter of total head thieff hatch 11.By repetition test, the internal diameter of thieff hatch has been carried out preferably, and according to internal diameter of the pipeline select thieff hatch quantity is set, further increase the accuracy of measurement. Thieff hatch quantity is set and position meets the requirement of " in Concentration in Fixed Pollutants Source, solid particulate matter measures and the gaseous contaminant method of sampling " (GB/T16157-1996).
The two ends of ram-air pipe 1 and static tube 2 are connected with sampling block 3 respectively, arrange total head sampling cavity 31 and static pressure sampling cavity 32 in sampling block 3, and ram-air pipe 1, static tube 2 connect with total head sampling cavity 31, static pressure sampling cavity 32 respectively. Fixing sampling head 4 on one of them sampling block 3, offer total head sampling passage 41, static pressure sampling passage 42 in sampling head 4 respectively, total head sampling passage 41, static pressure sampling passage 42 connect with total head sampling cavity 31, static pressure sampling cavity 32 respectively. Another sidewall of sampling block 3 fixes standby sampling head 5, when sampling head 4 blocking needs to change, can temporarily be measured by standby sampling head 5, it is ensured that the seriality of measurement.
The total head sampling passage 41 of sampling head 4, static pressure sampling passage 42 are connected with differential pressure transmitter 8 through total head fairlead 6, static pressure fairlead 7 respectively, and total head fairlead 6, static pressure fairlead 7 are respectively mounted measurement electromagnetic valve 61,71. Difference scavenging pipeline 9 in parallel on total head fairlead 6, static pressure fairlead 7, scavenging pipeline 9 is installed blowback electromagnetic valve 91, and scavenging pipeline 9 is connected with blow device 92, and blow device 92 adopts air compressor.
In order to prevent the internal blocking of effusion meter, blow device 92 is set, controlled regularly ram-air pipe 1 and static tube 2 and each fairlead to be carried out reverse blow by PLC, source purge gas is provided by air compressor, pressure is 0.5MPa, blowback electromagnetic valve 91 closes time flat entirely, when purging, first close the measurement electromagnetic valve on total head, static pressure fairlead, be then turned on blowback electromagnetic valve, purge, purging closes blowback electromagnetic valve after completing, open the measurement electromagnetic valve on total head, static pressure fairlead, continue to measure, it is ensured that measurement accuracy.
The often two ends stationary positioned flange 12 respectively of ram-air pipe 1, static tube 2 in group sampling tube, locating flange 12 is connected by bolt is fixing with flange sleeve 13, on circular pipe 10 sidewall, four installing holes 14 are offered respectively during installation, four flange sleeve 13 are respectively welded in four installing holes 14, thus effusion meter is arranged on circular pipe 10.
The measurement process of circular pipe total cross-section effusion meter of the present invention is: in circular pipe 10 on same cross section, two groups of sampling tubes of quadrature arrangement, the total head fairlead 6 of two groups of sampling tubes and static pressure fairlead 7 access a set of differential pressure transmitter 8, when measuring gas flow, the average total head in this cross section measured by total head thieff hatch 11, the average static pressure on this cross section then measured by static pressure thieff hatch 21, differential pressure transmitter 8 exports 4-20mA signal to Data collection and precessing system, draws cross section average discharge according to Bernoulli equation after being calculated. Flue gas flow computing formula is:
Wherein, K is discharge coefficient; A is sectional area (m2); Δ P is differential pressure (Pa); ρ is gas density (kg/m3)。
Circular pipe total cross-section effusion meter of the present invention is widely used in the flow measurements of toxic emission in the circular pipe of dedusting, denitration and desulfurization such as electric power, oil and chemical industry, mainly circular industrial exhaust gas pipeline waste gases discharge capacity is carried out On-line sampling system and monitoring, and monitoring data and information are sent to environmental protection authorities, it is ensured that monitor in real time and the total amount statistics to blowdown enterprise pollution thing discharge capacity.
Embodiment described above is only that the preferred embodiment of the present invention is described; not the scope of the present invention is defined; under the premise designing spirit without departing from the present invention; various deformation that technical scheme is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention is determined.
Claims (6)
1. a circular pipe total cross-section effusion meter, it is characterized in that: include two groups of sampling tubes of quadrature arrangement, often group sampling tube includes ram-air pipe and static tube, ram-air pipe and static tube are arranged back-to-back, windward to offering some total head thieff hatchs on ram-air pipe, static tube offers some static pressure thieff hatchs in opposite direction, the two ends of ram-air pipe and static tube are connected with sampling block respectively, in sampling block, total head sampling cavity and static pressure sampling cavity are set, ram-air pipe, static tube respectively with total head sampling cavity, static pressure sampling cavity connects, one of them sampling block fixes sampling head, total head sampling passage is offered respectively in sampling head, static pressure sampling passage, total head sampling passage, static pressure sampling passage respectively with total head sampling cavity, static pressure sampling cavity connects, the total head sampling passage of sampling head, static pressure sampling passage is respectively through total head fairlead, static pressure fairlead is connected with differential pressure transmitter, total head fairlead, static pressure fairlead is respectively mounted measurement electromagnetic valve, total head fairlead, difference scavenging pipeline in parallel on static pressure fairlead, scavenging pipeline is installed blowback electromagnetic valve, scavenging pipeline is connected with blow device, often ram-air pipe in group sampling tube, the two ends of static tube are stationary positioned flange respectively, locating flange is fixing with flange sleeve to be connected.
2. circular pipe total cross-section effusion meter according to claim 1, it is characterised in that: another sidewall of described sampling block fixes standby sampling head.
3. circular pipe total cross-section effusion meter according to claim 2, it is characterized in that: on every described ram-air pipe, the quantity of total head thieff hatch is chosen as 4 or 6 or 8, multiple total head thieff hatchs are symmetrical arranged with circular pipe centrage, and static pressure thieff hatch is equal with the quantity of total head thieff hatch and position is corresponding.
4. circular pipe total cross-section effusion meter according to claim 3, it is characterised in that: the internal diameter of described total head thieff hatch is 6mm or 8mm, and the static pressure thieff hatch of correspondence position is identical with the internal diameter of total head thieff hatch.
5. circular pipe total cross-section effusion meter according to claim 4, it is characterised in that: described blow device adopts air compressor.
6. the circular pipe total cross-section effusion meter according to any one of claim 1-5, it is characterised in that: described ram-air pipe and static tube adopt stainless steel tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610258140.8A CN105675067A (en) | 2016-04-22 | 2016-04-22 | Circular pipeline full-area flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610258140.8A CN105675067A (en) | 2016-04-22 | 2016-04-22 | Circular pipeline full-area flow meter |
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| Publication Number | Publication Date |
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| CN105675067A true CN105675067A (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610258140.8A Pending CN105675067A (en) | 2016-04-22 | 2016-04-22 | Circular pipeline full-area flow meter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414300A (en) * | 2018-05-30 | 2018-08-17 | 上海云鱼智能科技有限公司 | Differential flow measures the gas analyzing apparatus synchronous with extraction |
| CN110824114A (en) * | 2019-11-13 | 2020-02-21 | 青海盐湖工业股份有限公司 | Gas oxygen content analysis system |
| CN112781652A (en) * | 2020-12-25 | 2021-05-11 | 江苏海讯环境技术有限公司 | Adjustable flue gas flow velocity of flow monitoring devices |
| CN112816005A (en) * | 2020-12-25 | 2021-05-18 | 江苏海讯环境技术有限公司 | Rotary type flue gas flow and flow velocity measuring device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU718710A2 (en) * | 1978-08-15 | 1980-02-29 | Днепропетровский завод шахтной автоматики | Rate-of-flow meter |
| CN201289392Y (en) * | 2008-11-14 | 2009-08-12 | 何庆 | Combined homo-speed tube flow sensor for detection lever |
| CN202304903U (en) * | 2011-10-21 | 2012-07-04 | 广州万德威尔自动化系统有限公司 | Exact air quantity measuring system |
| CN203414115U (en) * | 2013-07-12 | 2014-01-29 | 皇家空调设备工程(广东)有限公司 | Air quantity sensor with double-cross structure |
| CN204286527U (en) * | 2014-11-29 | 2015-04-22 | 山东泰山钢铁集团有限公司 | Prevent the Simple counter blowing apparatus of the dirty blocking of differential pressure flowmeter pressure tappings ash |
| CN205506130U (en) * | 2016-04-22 | 2016-08-24 | 南京友智科技有限公司 | Circular pipeline total cross -section flowmeter |
-
2016
- 2016-04-22 CN CN201610258140.8A patent/CN105675067A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU718710A2 (en) * | 1978-08-15 | 1980-02-29 | Днепропетровский завод шахтной автоматики | Rate-of-flow meter |
| CN201289392Y (en) * | 2008-11-14 | 2009-08-12 | 何庆 | Combined homo-speed tube flow sensor for detection lever |
| CN202304903U (en) * | 2011-10-21 | 2012-07-04 | 广州万德威尔自动化系统有限公司 | Exact air quantity measuring system |
| CN203414115U (en) * | 2013-07-12 | 2014-01-29 | 皇家空调设备工程(广东)有限公司 | Air quantity sensor with double-cross structure |
| CN204286527U (en) * | 2014-11-29 | 2015-04-22 | 山东泰山钢铁集团有限公司 | Prevent the Simple counter blowing apparatus of the dirty blocking of differential pressure flowmeter pressure tappings ash |
| CN205506130U (en) * | 2016-04-22 | 2016-08-24 | 南京友智科技有限公司 | Circular pipeline total cross -section flowmeter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414300A (en) * | 2018-05-30 | 2018-08-17 | 上海云鱼智能科技有限公司 | Differential flow measures the gas analyzing apparatus synchronous with extraction |
| CN110824114A (en) * | 2019-11-13 | 2020-02-21 | 青海盐湖工业股份有限公司 | Gas oxygen content analysis system |
| CN112781652A (en) * | 2020-12-25 | 2021-05-11 | 江苏海讯环境技术有限公司 | Adjustable flue gas flow velocity of flow monitoring devices |
| CN112816005A (en) * | 2020-12-25 | 2021-05-18 | 江苏海讯环境技术有限公司 | Rotary type flue gas flow and flow velocity measuring device |
| CN112781652B (en) * | 2020-12-25 | 2022-07-01 | 南京聚格环境科技有限公司 | Adjustable flue gas flow velocity of flow monitoring devices |
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Application publication date: 20160615 |
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