CN112050888A - System and method for measuring inlet air volume of coal mill of pulverizing system - Google Patents
System and method for measuring inlet air volume of coal mill of pulverizing system Download PDFInfo
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- CN112050888A CN112050888A CN202010682280.4A CN202010682280A CN112050888A CN 112050888 A CN112050888 A CN 112050888A CN 202010682280 A CN202010682280 A CN 202010682280A CN 112050888 A CN112050888 A CN 112050888A
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- 239000003245 coal Substances 0.000 title claims abstract description 32
- 238000010298 pulverizing process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Classifications
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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
- G01F1/68—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 thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow
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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
- G01F1/68—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 thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
- G01F1/6888—Thermoelectric elements, e.g. thermocouples, thermopiles
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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
- G01F1/68—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 thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
- G01F1/69—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element of resistive type
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Disintegrating Or Milling (AREA)
- Crushing And Grinding (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a system and a method for measuring the inlet air quantity of a coal mill of a pulverizing system, belonging to the field of fluid flow measurement and comprising a hot primary air pipeline, a cold primary air pipeline and a mixed air pipeline, wherein the hot primary air pipeline and the cold primary air pipeline are both communicated with the mixed air pipeline; a hot primary air adjusting baffle is arranged in the hot primary air pipeline; a flowmeter, a cold primary air adjusting baffle and a cold primary air guide plate are arranged in the cold primary air pipeline; and a cold primary air splitter is arranged at the intersection of the cold primary air pipeline and the hot primary air pipeline, and is provided with a nozzle. The invention utilizes the energy conservation theorem, reflects the main path airflow flow and the total flow after confluence by accurately measuring the flow of the small branch path, is a method for measuring and amplifying the flow, and can thoroughly solve the problem of the measurement accuracy of the mixed air flow of the coal mill of a coal pulverizing system.
Description
Technical Field
The invention relates to a system and a method for measuring the inlet air quantity of a coal mill of a pulverizing system, which are also suitable for measuring the flow of a cold and hot medium mixing system and belong to the field of fluid flow measurement.
Background
In industrial production, the flow measurement problem of a cold and hot same-medium mixing system often exists. For coal-fired power plants, the system is represented by a cold-hot primary air mixing system at the inlet of a coal mill of a coal pulverizing system.
The coal-fired power plant pulverizing system is an important auxiliary system of a boiler, and the safe and economic operation of the coal-fired power plant pulverizing system directly determines the economical efficiency and the safety of unit operation. The operation of the pulverizing system has higher requirements on the accuracy of the mixed air flow at the inlet of the coal mill, such as Chinese patent with publication number CN103920578B, but the design requirement of the arrangement mode of main and auxiliary machines of the boiler is compact due to the factor of the construction cost of the unit, which is contradictory to the strict requirement of the accuracy of a flow meter measuring element on the straight pipe sections before and after installation. According to the current situation of common equipment, the current coal mill inlet air quantity measuring device is inaccurate in measurement, even the flow display value is opposite to the direction of a baffle switch, and a corresponding proprietary technology for solving the problem is needed.
Disclosure of Invention
The invention provides a system and a method for measuring the inlet air quantity of a coal mill of a coal pulverizing system in order to thoroughly solve the problem of the accuracy of the measurement of the mixed air flow of the coal mill of the coal pulverizing system.
The technical scheme adopted by the invention for solving the problems is as follows: a system for measuring the air quantity at the inlet of a coal mill of a pulverizing system is characterized by comprising a hot primary air pipeline, a cold primary air pipeline and a mixed air pipeline, wherein the hot primary air pipeline and the cold primary air pipeline are communicated with the mixed air pipeline; a hot primary air adjusting baffle is arranged in the hot primary air pipeline; a flow meter, a cold primary air adjusting baffle and a cold primary air guide plate are arranged in the cold primary air pipeline; the intersection of the cold primary air pipeline and the hot primary air pipeline is provided with a cold primary air splitter, and the cold primary air splitter is provided with a nozzle.
Preferably, the hot primary air adjusting baffle is installed in such a manner that the shaft portion is parallel to the cold primary air splitter.
Further, cold primary air pipeline includes parallel section and vertical section, parallel section and hot primary air pipeline parallel arrangement, the vertical section is connected with hot primary air pipeline, cold primary air guide plate sets up the turning department at parallel section and vertical section.
Preferably, the cross section of the joint of the hot primary air pipeline and the mixed air pipeline is of a rectangular structure, and the cold primary air splitter penetrates through the hot primary air pipeline. The cold primary air flow dividers are arranged in a layered mode, and the height of each cold primary air flow divider is the same as that of the section of the rectangular structure.
Preferably, the flowmeter is arranged on a cold primary air pipeline (a branch pipe with the minimum flow), and the lengths of straight pipeline sections in front of and behind the flowmeter are designed according to the requirement of equipment installation. Circular pipelines (other cross-sectional shapes can be matched with the installation requirements of the flow meter) are preferably used as the cold primary air pipelines. Because the cold primary air volume in the system is small (about 20-40% of the powder making system), the space position meeting the requirements of the front and rear straight pipe sections of the flowmeter is small, and the requirements can be met in a compact field space.
Furthermore, thermocouple (or thermal resistance) temperature measuring elements are respectively installed in the hot primary air pipeline and the cold primary air pipeline and are used for measuring the temperature T1 and T2 of media in the cold primary air pipeline and the hot primary air pipeline in front of the mixed air pipeline; and a thermocouple (or thermal resistor) temperature measuring element is arranged at the downstream part (close to the inlet of the coal mill) of the mixed air pipeline and is used for measuring the temperature T3 of the mixed medium, and the T3 can accurately represent the average temperature of the mixed medium due to the structural consideration of intensified mixing at the mixed part.
The working method of the coal pulverizing system coal mill inlet air quantity measuring system is characterized by comprising the following steps of: hot primary air introduced from the hot primary air pipeline flows through the hot primary air adjusting baffle arranged horizontally on the shaft part, and the hot primary air can continuously keep a flow field in the transverse direction uniform due to the installation characteristics of the hot primary air adjusting baffle; cold primary air led from the cold primary air pipeline flows through a cold primary air adjusting baffle arranged horizontally on the shaft part and then turns through a cold primary air guide plate at the turning part of the downstream pipeline, the cold primary air finally enters a cold primary air flow divider arranged in multiple layers and is sprayed into hot primary air flow after being rectified by a nozzle of the cold primary air flow divider, and the cold primary air and the hot primary air are alternately distributed in the upper layer and the lower layer, so that the air flow can be quickly mixed; the multilayer cold primary air flow divider arranged at the tail end of the cold primary air traverses the hot primary air pipeline, so that the mixing proportion of the cold primary air flow divider and the hot primary air flow pipeline is kept the same at any position in the transverse direction (vertical to the flowing direction), and uneven mixing caused by structural factors is prevented; the nozzle and the hot primary air keep a certain included angle, so that the system resistance is small; thermocouple (or thermal resistance) temperature measuring elements are respectively arranged on the cold primary air pipeline and the hot primary air pipeline to measure the temperature T1 and T2 of the medium before mixing, and the thermocouple (or thermal resistance) temperature measuring element is arranged at the downstream part (close to the inlet of the coal mill) after mixing to measure the temperature T3 of the medium after mixing; the flowmeter can accurately measure the cold primary air quantity Q1, in addition, the hot primary air flow is expressed by Q2, the mixed air flow is expressed by Q3, and according to the law of conservation of energy, the media of each pipeline meet the formula: since Q1 × T1+ Q2 × T2= (Q2 + Q1) × T3, (Q2 + Q1) = Q3 are known, Q2 and Q3 can be obtained by calculation since T1, T2, T3 and Q1 are known, and the purpose of measuring the flow rate of the system is achieved.
Compared with the prior art, the invention has the following advantages and effects: when the pipeline system with limited space is used for measuring flow, the method is not direct flow measurement, the influence of a flow field on the flow measurement accuracy is avoided, and the strong mixing and turbulent flow of the flow field are beneficial to the higher representativeness of a measured value of the temperature relative to the average temperature of a cross section; the invention utilizes the energy conservation theorem, reflects the main path airflow flow and the total flow after confluence by accurately measuring the flow of the small branch path, and is a method for measuring and amplifying the flow. Through the treatment, the problem of accuracy of measurement of the mixed air flow of the coal mill of the coal pulverizing system can be thoroughly solved.
Drawings
FIG. 1 is a schematic structural diagram of a system for measuring the inlet air volume of a coal mill of a pulverizing system in an embodiment of the invention.
Fig. 2 is a cross-sectional view taken along the plane a-a in fig. 1.
Fig. 3 is a perspective view of fig. 1.
Fig. 4 is a sectional view showing the arrangement of the cold primary air splitter in the embodiment of the present invention.
Fig. 5 is a schematic layout of a cold primary air splitter in an embodiment of the present invention.
In the figure: the device comprises a hot primary air pipeline 1, a mixed air pipeline 2, a cold primary air pipeline 3, a cold primary air adjusting baffle 4, a flowmeter 5, a hot primary air adjusting baffle 6, a cold primary air guide plate 7, a cold primary air splitter 8 and a nozzle 9.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1 to 5, in the embodiment, the system for measuring the inlet air volume of the coal mill of the pulverizing system includes a hot primary air pipeline 1, a cold primary air pipeline 3 and a mixed air pipeline 2, wherein the hot primary air pipeline 1 and the cold primary air pipeline 3 are both communicated with the mixed air pipeline 2; a hot primary air adjusting baffle 6 is arranged in the hot primary air pipeline 1; a flowmeter 5, a cold primary air adjusting baffle 4 and a cold primary air guide plate 7 are arranged in the cold primary air pipeline 3; a cold primary air splitter 8 is arranged at the intersection of the cold primary air pipeline 3 and the hot primary air pipeline 1, and a nozzle 9 is arranged on the cold primary air splitter 8.
In this embodiment, the cold primary air duct 3 includes a parallel section and a vertical section, the parallel section is arranged in parallel with the hot primary air duct 1, the vertical section is connected with the hot primary air duct 1, and the cold primary air guide plate 7 is disposed at a turning point of the parallel section and the vertical section.
In this embodiment, the cross-section of the joint of the hot primary air pipeline 1 and the mixed air pipeline 2 is a rectangular structure, the cold primary air distributors 8 are arranged in layers, and the height of the cold primary air distributors 8 is the same as the height of the cross-section of the rectangular structure.
In this embodiment, thermocouple (or thermal resistor) temperature measuring elements are respectively installed in the hot primary air pipeline 1 and the cold primary air pipeline 3, and are used for measuring the temperatures T1 and T2 of media in the cold primary air pipeline 3 and the hot primary air pipeline 1 before the mixed air pipeline 2; the downstream part (close to the inlet of the coal mill) of the mixed air pipeline 2 is provided with a thermocouple (or thermal resistance) temperature measuring element for measuring the temperature T3 of the mixed medium, and due to the structural consideration of intensified mixing, the T3 can accurately represent the average temperature of the mixed medium.
In the working method, hot primary air introduced from the hot primary air pipeline 1 flows through the hot primary air adjusting baffle 6 which is horizontally arranged on the shaft part, and the hot primary air can continuously keep the flow field in the transverse direction uniform due to the installation characteristics of the hot primary air adjusting baffle 6; cold primary air led from the cold primary air pipeline 3 flows through a cold primary air adjusting baffle 4 arranged horizontally on the shaft part, then turns through a cold primary air guide plate 7 at the turning part of the downstream pipeline, the cold primary air finally enters a cold primary air flow divider 8 arranged in multiple layers, and is rectified by a nozzle 9 and then sprayed into hot primary air flow, and the cold primary air and the hot primary air are alternately distributed in the upper layer and the lower layer, so that the air flow can be quickly mixed; the multilayer cold primary air flow divider 8 arranged at the tail end of the cold primary air traverses the hot primary air pipeline 1, so that the mixing proportion of the cold primary air flow divider and the hot primary air flow divider is kept the same at any position in the transverse direction (vertical to the flowing direction), and uneven mixing caused by structural factors is prevented; the nozzle 9 and the hot primary air keep a certain included angle, so that the system resistance is small; thermocouple (or thermal resistance) temperature measuring elements are respectively arranged on the cold primary air pipeline 3 and the hot primary air pipeline 1 to measure the temperature T1 and T2 of the medium before mixing, and a thermocouple (or thermal resistance) temperature measuring element is arranged at the downstream part (close to the inlet of the coal mill) after mixing to measure the temperature T3 of the medium after mixing; the flowmeter 5 can accurately measure the cold primary air quantity Q1, in addition, the hot primary air flow is expressed by Q2, the mixed air flow is expressed by Q3, and according to the law of conservation of energy, the medium among the pipeline media satisfies the formula: since Q1 × T1+ Q2 × T2= (Q2 + Q1) × T3, (Q2 + Q1) = Q3 are known, Q2 and Q3 can be obtained by calculation since T1, T2, T3 and Q1 are known, and the purpose of measuring the flow rate of the system is achieved.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. A system for measuring the air quantity at the inlet of a coal mill of a pulverizing system is characterized by comprising a hot primary air pipeline (1), a cold primary air pipeline (3) and a mixed air pipeline (2), wherein the hot primary air pipeline (1) and the cold primary air pipeline (3) are communicated with the mixed air pipeline (2); a hot primary air adjusting baffle (6) is arranged in the hot primary air pipeline (1); a flowmeter (5), a cold primary air adjusting baffle plate (4) and a cold primary air guide plate (7) are arranged in the cold primary air pipeline (3); a cold primary air flow divider (8) is arranged at the intersection of the cold primary air pipeline (3) and the hot primary air pipeline (1), and a nozzle (9) is arranged on the cold primary air flow divider (8); the cross section of the joint of the hot primary air pipeline (1) and the mixed air pipeline (2) is of a rectangular structure, the cold primary air flow dividers (8) are arranged in a layered mode, and the height of each cold primary air flow divider (8) is the same as that of the cross section of the rectangular structure.
2. The coal pulverizer inlet air quantity measuring system of the coal pulverizing system as claimed in claim 1, wherein said cold primary air duct (3) comprises a parallel section and a vertical section, said parallel section is arranged in parallel with the hot primary air duct (1), said vertical section is connected with the hot primary air duct (1), and said cold primary air deflector (7) is disposed at the turn of the parallel section and the vertical section.
3. The system for measuring the inlet air quantity of the coal pulverizer of the coal pulverizing system as claimed in claim 1, wherein temperature measuring elements are respectively installed in the primary hot air pipeline (1) and the primary cold air pipeline (3) and used for measuring the temperatures T1 and T2 of media in the primary hot air pipeline (1) and the primary cold air pipeline (3) in front of the mixed air pipeline (2); and a temperature measuring element is arranged at the downstream part of the mixed air pipeline (2) and is used for measuring the temperature T3 of the mixed medium.
4. A working method of a coal pulverizing system coal mill inlet air quantity measuring system as claimed in any one of claims 1-3, characterized by the following process: hot primary air introduced from the hot primary air pipeline (1) flows through a hot primary air adjusting baffle (6) horizontally arranged on the shaft part, and the hot primary air continuously keeps uniform flow field in the transverse direction; cold primary air led from the cold primary air pipeline (3) flows through a cold primary air adjusting baffle (4) arranged horizontally on the shaft part, then turns through a cold primary air guide plate (7) at the turning part of the downstream pipeline, the cold primary air finally enters a cold primary air flow divider (8) arranged in multiple layers, and is rectified by a nozzle (9) of the cold primary air flow divider and then sprayed into hot primary air flow, and the cold primary air and the hot primary air are alternately distributed in the upper layer and the lower layer to ensure that the air flows are quickly mixed; the multilayer cold primary air flow divider (8) arranged at the tail end of the cold primary air traverses the hot primary air pipeline (1), so that the mixing proportion of the cold primary air flow divider and the hot primary air flow pipeline is kept the same in the transverse direction, and uneven mixing caused by structural factors is prevented; the nozzle (9) keeps a certain included angle with the hot primary air, so that the system resistance is small; temperature measuring elements are respectively arranged on the cold primary air pipeline (3) and the hot primary air pipeline (1) to measure the temperature T1 and T2 of the medium before mixing, and the temperature measuring elements are arranged at the downstream part after mixing to measure the temperature T3 of the medium after mixing; the flowmeter (5) measures cold primary air quantity Q1, hot primary air quantity is expressed by Q2, mixed air quantity is expressed by Q3, and according to the law of conservation of energy, the media of each pipeline satisfy the formula: since Q1 × T1+ Q2 × T2= (Q2 + Q1) × T3, (Q2 + Q1) = Q3 are known, Q2 and Q3 can be obtained by calculation since T1, T2, T3 and Q1 are known, and the purpose of measuring the flow rate of the system is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010682280.4A CN112050888A (en) | 2020-07-15 | 2020-07-15 | System and method for measuring inlet air volume of coal mill of pulverizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010682280.4A CN112050888A (en) | 2020-07-15 | 2020-07-15 | System and method for measuring inlet air volume of coal mill of pulverizing system |
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| CN112050888A true CN112050888A (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010682280.4A Pending CN112050888A (en) | 2020-07-15 | 2020-07-15 | System and method for measuring inlet air volume of coal mill of pulverizing system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949717A (en) * | 2015-06-29 | 2015-09-30 | 南京博沃科技发展有限公司 | Primary air flow measuring system for entrance of coal mill |
| CN105953832A (en) * | 2016-04-27 | 2016-09-21 | 东南大学 | Coal mill inlet primary air pipeline and air quantity and air temperature in pipeline measuring method |
| CN109459102A (en) * | 2018-11-27 | 2019-03-12 | 江苏方天电力技术有限公司 | A kind of medium-speed pulverizer import primary air measuring method and system |
| CN212903356U (en) * | 2020-07-15 | 2021-04-06 | 华电电力科学研究院有限公司 | System for measuring inlet air volume of coal mill of pulverizing system |
-
2020
- 2020-07-15 CN CN202010682280.4A patent/CN112050888A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949717A (en) * | 2015-06-29 | 2015-09-30 | 南京博沃科技发展有限公司 | Primary air flow measuring system for entrance of coal mill |
| CN105953832A (en) * | 2016-04-27 | 2016-09-21 | 东南大学 | Coal mill inlet primary air pipeline and air quantity and air temperature in pipeline measuring method |
| CN109459102A (en) * | 2018-11-27 | 2019-03-12 | 江苏方天电力技术有限公司 | A kind of medium-speed pulverizer import primary air measuring method and system |
| CN212903356U (en) * | 2020-07-15 | 2021-04-06 | 华电电力科学研究院有限公司 | System for measuring inlet air volume of coal mill of pulverizing system |
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