CN104406646A - Measurement device of pulverized coal mass flow meter - Google Patents
Measurement device of pulverized coal mass flow meter Download PDFInfo
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- CN104406646A CN104406646A CN201410590212.XA CN201410590212A CN104406646A CN 104406646 A CN104406646 A CN 104406646A CN 201410590212 A CN201410590212 A CN 201410590212A CN 104406646 A CN104406646 A CN 104406646A
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- pressure
- pulverized coal
- venturi tube
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Abstract
The invention relates to a measurement device for measuring the mass flow of high-pressure dense-phase gas-solid two-phase flow. The measurement device is applied to on-line measurement of the flow of in-furnace pulverized coal in a pulverized coal gasification process. The measurement device of a pulverized coal mass flow meter comprises a Venturi tube, a temperature meter, a density meter, a differential pressure meter and a pressure meter, wherein the Venturi tube is connected to a pulverized coal conveying pipe and is arranged on a vertical rising pipeline of the pulverized coal conveying pipe; the density meter and the temperature meter are sequentially mounted at the front end of the Venturi tube; the high-pressure tapping end and the low-pressure tapping end of the differential pressure meter are connected with an inlet of the Venturi tube and a throat pipeline respectively; the pressure meter is connected to the high-pressure gas inlet end of the differential pressure meter. The measurement device has the beneficial effects that the pulverized coal mass flow meter is a gas-solid two-phase flow measurement instrument; particularly in the pulverized coal transportation process, the in-furnace pulverized coal in a pulverized coal gasification device can be measured on line, and the device is more accurate in measurement, stable in performance and easy to maintain, so that the ratio of oxygen to coal can be automatically controlled, and the aims of stably operating a system and reducing consumption are achieved.
Description
Technical field
The present invention relates to a kind of measurement mechanism measuring high pressure dense gas solid flow mass rate, be applicable to the on-line measurement of as-fired coal powder flow in powdered coal pressuring gasified technique.
Background technology
The Measurement accuracy of the as-fired coal powder mass rate in powdered coal pressuring gasified technology, runs significant to the economic security of gasification furnace.By the pulverized coal mass flow under online Measurement accuracy high pressure two-phase transportation condition and then the oxygen coal ratio effectively controlling gasification, gasification efficiency is made to reach best, the problems such as the security incident generation preventing gasification from causing because of the imbalance of oxygen coal ratio and technic index deterioration.
Measure coal dust in current bed pulverized coal gasification technology and enter the technology that stove flow takes:
Capacitance method, namely utilizes condenser type velograph and condenser type densimeter to measure the concentration of fluid and speed to realize fine coal flow measurement.Its principle is for change by electric field medium dielectric constant microwave medium, namely electric capacity changes, and measures pulverized coal mass flow.Find that capacitance type sensor is subject to the impact of the factor such as coal, liquid water content by practical application, cause measurement result erratic fluctuations comparatively large, and have influence on measuring accuracy.And the output signal of capacitance type sensor is still difficult to maintain a long-term stability.The oxygen coal of gasification installation is than also automatically adjusting.
In sum, in the field of pulverized coal flow bulk measurement, the measuring technique of mass rate not yet obtains result of great satisfaction.
Summary of the invention
The object of the invention is flow measurement in order to overcome pipeline fine coal in gasifying powder coal device can not accurate measurement, measure unstable defect, the invention provides a kind of by the transformation to traditional way flow instrument, the principle of the pressure drop produced when utilizing Dual-Phrase Distribution of Gas olid to flow through Venturi tube, can on-line measurement fine coal flow, its structure is simply easy to safeguard, dependable performance is stablized, and measuring accuracy is relatively high, and the relatively low saving cost of cost.
The object of the present invention is achieved like this,
A kind of pulverized coal mass flow measuring device, it is characterized in that, comprise the Venturi tube, thermometer, densitometer, differential pressure gauge, the pressure gauge that are connected on coal dust delivery pipe, described Venturi tube is arranged on the vertical increase in pipeline of coal dust delivery pipe, the front end of Venturi tube has installed densitometer and thermometer successively, the high-low pressure pressure end of differential pressure gauge is connected with venturi tube inlet cylindrical section and cylindrical throat pipeline respectively, the high pressure admission end of pressure gauge access differential pressure gauge.
According to described pulverized coal mass flow measuring device, it is characterized in that, the high-low pressure pressure pipeline of described differential pressure gauge is provided with retaining valve.
According to described pulverized coal mass flow measuring device, it is characterized in that, the high-low pressure pressure pipeline of described differential pressure gauge is connected with pressure respectively and regulates blowning installation inside the retaining valve of differential pressure gauge, and pressure regulates blowning installation to be consistent in the purging tolerance of the high-low pressure pressure pipeline of differential pressure gauge.
According to described pulverized coal mass flow measuring device, it is characterized in that, the high-low pressure pressure pipeline of described differential pressure gauge and the oblique coal dust rising end of Venturi axis angle at 45 °.
The invention has the beneficial effects as follows:
Fine coal mass flowmeter of the present invention is a kind of gas-particle two-phase flowmeter device, especially at fine coal course of conveying, can realize the on-line measurement entering stove fine coal in gasifying powder coal device, measures comparatively accurately, stable performance, applicability are good, is easy to safeguard.Thus realize oxygen coal than automatically controlling, reach system stable operation and reduce the object consumed.
Accompanying drawing explanation
Fig. 1 is the structural representation of fine coal mass flowmeter of the present invention.
Reference numeral: 1, thermometer, 2, densitometer, 3, pressure gauge, 4, differential pressure gauge, 5, pressure regulates blowning installation, 6, Venturi tube, 7, retaining valve, 8, inlet cylinders section, 9, circular cone contraction section, 10, cylindrical throat, 11, circular cone diffuser.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
A kind of new coal powder mass flow meter measurement device, comprises thermometer 1, densitometer 2, Venturi tube 6, differential pressure gauge 4, pressure gauge 3, pressure adjustment blowning installation 5, retaining valve 7 successively.
Venturi tube requires to be arranged on the vertical increase in pipeline of coal dust conveying, and installs thermometer and densitometer successively in the upstream of Venturi tube.Thermometer should adopt wear-resistant sleeve, and the upstream as Venturi tube has bend pipe to be arranged in bend pipe to survey, and insertion depth not easily too much prevents from producing throttling in pipeline, or the flow pattern of convection cell causes interference to form labile factor.
Described differential pressure gauge is for measuring the pressure drop produced when Dual-Phrase Distribution of Gas olid flows through Venturi tube, and its high-low pressure pressure end is connected with the pressure port of cylindrical throat with venturi tube inlet cylindrical section respectively.The high-low pressure pressure pipe of differential pressure gauge is provided with separately a set of pressure and regulates blowning installation, this device is for regulating the purging tolerance of pressure pipe, maintain constant small tolerance to purge pressure pipe, can remove mixed and disorderly substances in pipe prevents connecting pipe from blocking, and namely this device comes into operation until can exit when instrument is removed or overhauled after instrument is installed.The pressure be arranged on when coming into operation on high-low pressure pressure pipe regulates the purging tolerance of blow device to be consistent.High-low pressure pressure pipe root is equipped with retaining valve, and working is that dust enters the generation of the faults such as connecting pipe results in blockage in order to prevent when pressure regulates blow device to break down.
Pressure gauge is for measuring the pressure at venturi tube inlet place, and this manometric pressure tappings is connected with the high pressure pressure pipeline of differential pressure gauge, to reduce the number of openings on pulverized coal channel.High-low pressure pressure pipe and Venturi axis angle at 45 ° are obliquely, prevent solid particle accumulated plugging pressure pipeline, its high-pressure side connecting pipe is connected to Venturi tube upstream open place, its low pressure end pressure pipe is connected to venturi throat position, and the high-low pressure pressure pipe other end is finally connected with the high-low pressure pressure chamber of differential pressure gauge respectively by retaining valve.
In the present embodiment, in coal dust course of conveying, when the gas-solid mixture of different in flow rate flows through this measurement mechanism body, this measurement mechanism is provided with pressure pipe at inlet horn cylindrical section and cylindrical throat, respectively entrance stagnation pressure and throat's static pressure are caused differential pressure gauge 4, and the corresponding differential pressure value produced between stagnation pressure to static pressure is recorded by differential pressure gauge 4, use the experimental data in the continuous Bernoulli equation ultimate principle of fluid and coal dust Geldart-D particle laboratory, calculate by the corresponding relation between the flow of pipeline and differential pressure, again in conjunction with correction and the temperature of gas-solid mixing ratio, the correction of pressure finally draws corresponding mathematical model.Because this device is provided with pressure pipe blow device 5, make institute's pressure force value more stable, accurate.Reliability and the precision of metering can be substantially increased.
The present invention is provided with cylindrical throat in Venturi tube 6, when fluid flows through the cylindrical throat of Venturi tube 6, speed is maximum, static pressure is minimum, the stagnation pressure on fluid cross-section is measured in the inlet cylinders section of Venturi tube 6, the difference of average total pressure and average static pressure is, its value changes with the size of throat, the size of throat specifically can be determined in design according to the size of actual flow velocity, this restriction device in inner structure in order to reduce resistance to flow, the junction of different angles tangent plane, all adopt the design of arc transition, also reduce the wearing and tearing of solid particle to sensor internal.In addition can according to actual conditions, adjustment diameter ratio (
d 2/
d 1) improve differential pressure value, with the measuring accuracy of guaranteed flow.
This flow apparatus take fluid mechanics as theoretical foundation, through the lot of experiments carried out in powder pneumatic conveying device, and finally determines by changing the operating conditionss such as pressure, temperature, concentration, flow velocity and has checked flow formula.So just ensure that reliability and the credibility of this flow apparatus.
Claims (4)
1. a pulverized coal mass flow measuring device, it is characterized in that, comprise the Venturi tube (6) be connected on coal dust delivery pipe, thermometer (1), densitometer (2), differential pressure gauge (4), pressure gauge (3), described Venturi tube (6) is arranged on the vertical increase in pipeline of coal dust delivery pipe, the front end of Venturi tube (6) installs thermometer (1) and densitometer (2) successively, the high-low pressure pressure end of differential pressure gauge (4) is connected with Venturi tube (6) inlet cylinders section and cylindrical throat pipeline respectively, the high pressure admission end of pressure gauge (3) access differential pressure gauge (4).
2. pulverized coal mass flow measuring device according to claim 1, is characterized in that, the high-low pressure pressure pipeline of described differential pressure gauge (4) is provided with retaining valve (7).
3. pulverized coal mass flow measuring device according to claim 1, it is characterized in that, retaining valve (7) inner side of high-low pressure pressure pipeline near differential pressure gauge (4) of described differential pressure gauge (4) is connected with pressure respectively and regulates blowning installation (5), and pressure regulates blowning installation (5) to be consistent in the purging tolerance of the high-low pressure pressure pipeline of differential pressure gauge (4).
4. pulverized coal mass flow measuring device according to claim 1, is characterized in that, the high-low pressure pressure pipeline of described differential pressure gauge (3) and the oblique coal dust rising end of Venturi tube (6) axis angle at 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410590212.XA CN104406646A (en) | 2014-10-29 | 2014-10-29 | Measurement device of pulverized coal mass flow meter |
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| CN201410590212.XA CN104406646A (en) | 2014-10-29 | 2014-10-29 | Measurement device of pulverized coal mass flow meter |
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| CN104406646A true CN104406646A (en) | 2015-03-11 |
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| CN201410590212.XA Pending CN104406646A (en) | 2014-10-29 | 2014-10-29 | Measurement device of pulverized coal mass flow meter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105628290A (en) * | 2016-03-30 | 2016-06-01 | 吴斌 | Novel gas-phase differential pressure measuring device |
| CN106197588A (en) * | 2016-06-23 | 2016-12-07 | 华东理工大学 | A kind of method assessing Dense Phase Pneumatic Conveying System solid phase mass flow |
| CN108896438A (en) * | 2018-07-25 | 2018-11-27 | 重庆大学 | Bottom hole gas bearing capacity measuring device and measurement method |
| CN109342261A (en) * | 2018-11-27 | 2019-02-15 | 煤科院节能技术有限公司 | A kind of evaluation method of dilute phase pneumatic conveying powder flow stability |
| CN112945321A (en) * | 2021-04-06 | 2021-06-11 | 卓宇轩 | Device and method for measuring solid phase flow in pipeline of gas-solid two-phase flow |
| CN113091840A (en) * | 2021-04-06 | 2021-07-09 | 卓宇轩 | Method for measuring solid phase flow in gas-solid two-phase flow |
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| US4569232A (en) * | 1984-10-01 | 1986-02-11 | The Babcock & Wilcox Company | Reaction mass flowmeter |
| CN1155071A (en) * | 1995-10-23 | 1997-07-23 | 巴布考克及威尔考克斯公司 | Two phase flow meter |
| CN1278596A (en) * | 2000-07-28 | 2001-01-03 | 上海电力学学院 | Pneumatic measurement method of flow rate and density of two-phase gas and solid flow |
| CN202885874U (en) * | 2012-10-08 | 2013-04-17 | 河北钢铁股份有限公司承德分公司 | Coal gas flow measuring device with functions of blowing and discharging pollution |
| CN203745019U (en) * | 2014-03-07 | 2014-07-30 | 华东理工大学 | Solid-phase flow rate measuring system of dense-phase pneumatic transportation process |
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| US4569232A (en) * | 1984-10-01 | 1986-02-11 | The Babcock & Wilcox Company | Reaction mass flowmeter |
| CN1155071A (en) * | 1995-10-23 | 1997-07-23 | 巴布考克及威尔考克斯公司 | Two phase flow meter |
| CN1278596A (en) * | 2000-07-28 | 2001-01-03 | 上海电力学学院 | Pneumatic measurement method of flow rate and density of two-phase gas and solid flow |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105628290A (en) * | 2016-03-30 | 2016-06-01 | 吴斌 | Novel gas-phase differential pressure measuring device |
| CN106197588A (en) * | 2016-06-23 | 2016-12-07 | 华东理工大学 | A kind of method assessing Dense Phase Pneumatic Conveying System solid phase mass flow |
| CN106197588B (en) * | 2016-06-23 | 2019-01-18 | 华东理工大学 | A method of assessment Dense Phase Pneumatic Conveying System solid phase mass flow |
| CN108896438A (en) * | 2018-07-25 | 2018-11-27 | 重庆大学 | Bottom hole gas bearing capacity measuring device and measurement method |
| CN109342261A (en) * | 2018-11-27 | 2019-02-15 | 煤科院节能技术有限公司 | A kind of evaluation method of dilute phase pneumatic conveying powder flow stability |
| CN112945321A (en) * | 2021-04-06 | 2021-06-11 | 卓宇轩 | Device and method for measuring solid phase flow in pipeline of gas-solid two-phase flow |
| CN113091840A (en) * | 2021-04-06 | 2021-07-09 | 卓宇轩 | Method for measuring solid phase flow in gas-solid two-phase flow |
| CN113091840B (en) * | 2021-04-06 | 2023-07-25 | 卓宇轩 | Method for measuring solid phase flow in gas-solid two-phase flow |
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Application publication date: 20150311 |