CN113686723A - Abrasion weight-reducing type pulverized coal pipeline air-powder deviation measuring device and method - Google Patents
Abrasion weight-reducing type pulverized coal pipeline air-powder deviation measuring device and method Download PDFInfo
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- CN113686723A CN113686723A CN202110976475.4A CN202110976475A CN113686723A CN 113686723 A CN113686723 A CN 113686723A CN 202110976475 A CN202110976475 A CN 202110976475A CN 113686723 A CN113686723 A CN 113686723A
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Abstract
The invention discloses a wear weight-reducing pulverized coal pipeline wind-powder deviation measuring device and method.
Description
Technical Field
The invention belongs to the technical field of coal-fired thermal power generation, and relates to a wear weight-reduction type pulverized coal pipeline wind-powder deviation measuring device and method.
Background
The coal pulverizing system is one of the most important auxiliary equipment of a coal-fired thermal power generating unit, and the coal required by boiler combustion is dried and milled by the coal pulverizing system to reach a proper particle size and then is further conveyed to the combustion system for the next reaction. The coal pulverizing system is a complex solid-solid and gas-solid interaction process, and is limited by discontinuity of working process, non-homogeneous phase of gas-solid flow and the like, and the air-powder airflow in different coal powder pipelines at the outlet of a coal mill has larger concentration and speed deviation.
The existence of coal powder concentration and speed deviation can directly influence the uniformity of an aerodynamic field in a boiler hearth, so that a series of problems of local high temperature, part abrasion, part coking, part burning loss and the like are caused. At present, the measurement of the coal powder concentration generally adopts the method of employing a professional sampling device to perform sampling test, so as to determine the powder quantity deviation between different coal powder pipelines. The method has higher qualification requirement and higher cost for testers.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device and a method for measuring the air-powder deviation of a wear weight-reducing type pulverized coal pipeline, which have low requirements on testing personnel and low cost.
In order to achieve the purpose, the abrasion weight-reducing pulverized coal pipeline wind-powder deviation measuring device comprises an abrasion testing element and a weighing device for weighing the abrasion testing element, wherein the abrasion testing element is positioned in a pulverized coal pipeline.
The sealing pipe seat is fixed on the side surface of the pulverized coal pipeline along the vertical direction, the connecting shaft penetrates through the sealing pipe seat and is inserted into the pulverized coal pipeline to be connected with the abrasion testing element, and the connecting shaft is provided with an angle positioner for fixing the connecting shaft and the sealing pipe seat.
The sealing medium used by the sealing tube seat is compressed air.
A method for measuring the wind-powder deviation of a wear weight-reduction type pulverized coal pipeline comprises the following steps:
1) respectively weighing the initial masses m of the N abrasion test elements by a weighing device1～mNSequentially installing N abrasion test elements in No. 1-N pulverized coal pipelines at the outlet of the coal mill;
2) adjusting the coal mill to a test working condition, adjusting and fixing the installation angle of the abrasion test element, and recording the start time of the test;
3) after the test time is reached, taking out each abrasion test element, simultaneously recording the time of taking out, and calculating the abrasion time t of each abrasion test element1～tN；
4) Weighing m of each wear test element by a weighing device1m～mNmCalculating the weight loss and weight loss delta m of each abrasion test element1～ΔmN；
5) According to the wear duration t of each wear test element1～tNAnd weight loss and loss of each abrasion test element delta m1～ΔmNCalculating the wear rate A per unit time of each wear test element1～ANAverage wear rate AaveAnd wind-powder deviation coefficient k1～kN。
The angle between the windward side of the abrasion test element and the flow direction of the wind powder airflow is 60 degrees.
Δm1～ΔmNMore than or equal to 10 times of measuring error of the weighing equipment.
Wind powder deviation coefficient k1～kNComprises the following steps:
Δmi＝mi-mim
Ai＝Δmi/ti
Aave＝(A1+……+AN)/N
ki＝(Ai-Aave)/Aave×100％。
when wind powder deviation coefficient ki>When 0, the coal powder concentration and the flow rate in the corresponding coal powder pipeline are higher; when wind powder deviation coefficient ki<And when 0, the coal powder concentration and the flow speed in the coal powder pipeline are low.
The invention has the following beneficial effects:
the abrasion weight-reducing pulverized coal pipeline wind-powder deviation measuring device and the method have the advantages that during specific operation, the abrasion testing element is placed in the pulverized coal pipeline, the installation angle of the abrasion testing element 3 is adjusted, after the test time is up, the abrasion rate per unit time, the average abrasion rate and the wind-powder deviation coefficient of the abrasion testing element are calculated according to the abrasion weight loss amount of the abrasion testing element and the test time, the requirement on testing personnel is low, the cost is low, meanwhile, the abrasion testing element 3 is simple and convenient to process and manufacture, can be purchased in batches, and is low in test cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein, 1 is an angle positioner, 2 is a sealing pipe seat, 3 is a wear test element, 4 is a pulverized coal pipeline, and 5 is weighing equipment.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the abrasion and weight reduction type pulverized coal duct wind-powder deviation measuring device of the invention comprises a pulverized coal duct 4, a sealing pipe seat 2, an abrasion test element 3 and a weighing device 5;
the sealing pipe seat 2 is fixed on the side face of the pulverized coal pipeline 4 in the vertical direction, the abrasion testing element 3 is located in the pulverized coal pipeline 4, the connecting shaft penetrates through the sealing pipe seat 2 and is connected with the abrasion testing element 3 after being inserted into the pulverized coal pipeline 4, the connecting shaft is provided with an angle positioner 1 for fixing the connecting shaft and the sealing pipe seat 2, and the weight of the abrasion testing element 3 is weighed through the weighing device 5.
The sealing medium used for sealing the socket 2 is compressed air.
The invention relates to a method for measuring the wind-powder deviation of a wear weight-reducing pulverized coal pipeline, which comprises the following steps:
1) the initial masses m of the N wear test elements 3 are each weighed by a weighing device 51～mNThen, sequentially installing N abrasion test elements 3 in a No. 1-N pulverized coal pipeline 4 at the outlet of the coal mill;
2) adjusting the coal mill to a test working condition, adjusting and fixing the angle of the abrasion test element 3 through the angle positioner 1, and recording the start time of the test;
3) after the test time is reached, taking out each abrasion test element 3, simultaneously recording the taking-out time, and calculating the abrasion duration t of each abrasion test element 31～tN；
4) The weight m of each wear test element 3 is weighed by a weighing device 51m～mNmCalculating the weight loss Δ m of each wear test element 31～ΔmN；
5) According to the wear duration t of each wear test element 31～tNAnd weight loss Δ m of each wear test element 31～ΔmNThe wear rate A per unit time of each wear test element 3 is calculated1～ANAverage wear rate AaveAnd wind-powder deviation coefficient k1～kN；
In the test process, the included angle between the windward side of the abrasion test element 3 and the flowing direction of the wind powder airflow is 60 degrees.
Δm1～ΔmNIs greater thanA weighing device 5 measuring error equal to 10 times.
Wind powder deviation coefficient k1～kNComprises the following steps:
Δmi＝mi-mim
Ai＝Δmi/ti
Aave＝(A1+……+AN)/N
ki＝(Ai-Aave)/Aave×100％。
when wind powder deviation coefficient ki>When 0, the coal powder concentration and the flow speed in the corresponding coal powder pipeline 4 are higher; when wind powder deviation coefficient ki<When 0, it means that the concentration and flow rate of the pulverized coal in the pulverized coal pipe 4 are low.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a wear and tear formula pulverized coal pipeline wind powder deviation measuring device that subtracts, its characterized in that includes wear test component (3) and is used for weighing apparatus (5) of wear test component (3) weight, and when experimental, wear test component (3) are located pulverized coal pipeline (4).
2. The abrasion weight-reducing pulverized coal duct air-powder deviation measuring device according to claim 1, wherein the sealing pipe seat (2) is fixed on the side surface of the pulverized coal duct (4), the connecting shaft is connected with the abrasion testing element (3) after penetrating through the sealing pipe seat (2) and being inserted into the pulverized coal duct (4), and the connecting shaft is provided with an angle positioner (1) for fixing the connecting shaft and the sealing pipe seat (2).
3. The abrasion weight-reducing pulverized coal pipeline wind-powder deviation measuring device according to claim 1, wherein the sealing medium used by the sealing pipe seat (2) is compressed air.
4. A method for measuring the wind-powder deviation of a wear weight-reduction type pulverized coal pipeline is characterized by comprising the following steps:
1) the initial masses m of the N wear test elements (3) are respectively weighed by a weighing device (5)1～mNSequentially installing N abrasion test elements (3) in a No. 1-N pulverized coal pipeline (4) at the outlet of the coal mill;
2) adjusting the coal mill to a test working condition, adjusting and fixing the installation angle of the abrasion test element (3), and recording the start time of the test;
3) after the test time is reached, taking out each abrasion test element (3), simultaneously recording the taken-out time, and calculating the abrasion time t of each abrasion test element (3)1～tN；
4) Weighing m of each wear test element (3) by means of a weighing device (5)1m～mNmCalculating the weight loss delta m of each abrasion test element (3)1～ΔmN；
5) According to the wear duration t of each wear test element (3)1～tNAnd the weight loss of each abrasion test element (3) is delta m1～ΔmNCalculating the wear rate A per unit time of each wear test element (3)1～ANAverage wear rate AaveAnd wind-powder deviation coefficient k1～kN。
5. The method for measuring the wind-powder deviation of the abrasion weight-reducing type pulverized coal pipeline according to claim 4, wherein the included angle between the windward side of the abrasion test element (3) and the flow direction of the wind-powder airflow is 60 degrees.
6. The method of claim 4, wherein Δ m is the wind-powder deviation of the coal powder duct1～ΔmNMore than or equal to 10 times of the measurement error of the weighing device (5).
7. Wear weight reduction according to claim 4The method for measuring the wind-powder deviation of the coal powder pipeline is characterized in that the wind-powder deviation coefficient k1～kNComprises the following steps:
Δmi＝mi-mim
Ai＝Δmi/ti
Aave＝(A1+……+AN)/N
ki＝(Ai-Aave)/Aave×100％。
8. the method for measuring the wind-powder deviation of the abrasion weight-reducing type pulverized coal pipeline according to the principle requirement 4 is characterized in that when the wind-powder deviation coefficient k isi>When the flow rate is 0, the coal powder concentration and the flow rate in the corresponding coal powder pipeline (4) are higher; when wind powder deviation coefficient ki<And when 0, the coal powder concentration and the flow speed in the coal powder pipeline (4) are low.
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| CN202110976475.4A CN113686723B (en) | 2021-08-24 | 2021-08-24 | Wear weight-reduction type pulverized coal pipeline wind-powder deviation measuring device and method |
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| CN202110976475.4A CN113686723B (en) | 2021-08-24 | 2021-08-24 | Wear weight-reduction type pulverized coal pipeline wind-powder deviation measuring device and method |
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2021
- 2021-08-24 CN CN202110976475.4A patent/CN113686723B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN105627344A (en) * | 2014-11-28 | 2016-06-01 | 国家电网公司 | Pulverizing system-based shutdown self-test method and device |
| WO2016206401A1 (en) * | 2015-06-26 | 2016-12-29 | 国电新能源技术研究院 | Device for detecting characteristic nature of coal on-line |
| CN205898268U (en) * | 2015-09-30 | 2017-01-18 | 邸生才 | Radiant type wind send pipeline buggy weight measurement appearance and a plurality of pipeline balanced powder control system that supplies |
| CN108644803A (en) * | 2018-06-12 | 2018-10-12 | 上海意丰机电科技开发有限公司 | A kind of wind powder real-time leveling device and leveling method |
| CN112763388A (en) * | 2021-01-20 | 2021-05-07 | 南京聚控智能科技有限公司 | Online monitoring system and method for concentration deviation between coal mill powder conveying pipelines |
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