CN113776616A - Method for improving capacity of raw coal hopper - Google Patents
Method for improving capacity of raw coal hopper Download PDFInfo
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- CN113776616A CN113776616A CN202111111773.3A CN202111111773A CN113776616A CN 113776616 A CN113776616 A CN 113776616A CN 202111111773 A CN202111111773 A CN 202111111773A CN 113776616 A CN113776616 A CN 113776616A
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- 239000003245 coal Substances 0.000 title claims abstract description 220
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005303 weighing Methods 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 52
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000004364 calculation method Methods 0.000 claims description 14
- 239000002390 adhesive tape Substances 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 6
- 239000011343 solid material Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 8
- 230000002860 competitive effect Effects 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
- 241000273930 Brevoortia tyrannus Species 0.000 description 18
- 238000013461 design Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003250 coal slurry Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
Abstract
The invention discloses a method for increasing the capacity of a raw coal hopper, which comprises the following steps: the method comprises the steps of installing a heavy hammer material level meter on a raw coal hopper for obtaining raw coal hopper material level data information in real time, installing a weighing type coal feeder on the raw coal hopper for obtaining real-time coal feeding amount data information of the coal feeder in real time, recording data information X of the raw coal hopper material level at the moment A when the moment A is marked as an initial moment, and recording data information Y of the raw coal hopper material level at the moment B when the moment B is marked as a final moment. According to the method for improving the capacity of the raw coal hopper, the real-time measurement of the actual capacity of the raw coal hopper which changes continuously is successfully realized, the problem that the combustible time of the coal stored in the raw coal hopper cannot be calculated is solved, the amount of blended coal of various coal types can be refined, the combustion cost can be controlled better, expected economic benefits can be obtained, competitive advantages can be obtained for enterprises in increasingly competitive markets, and the sustainable development of the enterprises is facilitated.
Description
Technical Field
The invention relates to the technical field of thermal power, in particular to a method for improving the capacity of a raw coal hopper.
Background
In the technical field of thermal power, a raw coal hopper refers to a storage bin for granular materials such as raw coal, coal slurry and the like in a thermal power plant, and the coal is ground into final storage equipment before pulverized coal, so that the raw coal hopper is very popular to use, the design capacity of the raw coal hopper can be calculated according to the shape and the size of the raw coal hopper in the thermal power plant, however, if the humidity and the viscosity of the fire coal entering the coal hopper are high, the coal can be attached to the inner wall of the raw coal hopper, and a large amount of wall-hanging fire coal can be formed in the past, so that the actual capacity of the raw coal hopper is greatly reduced, and after a period of running time, the wall-hanging fire coal can fall at a certain time, so that the actual capacity of the raw coal hopper is greatly improved, and the actual capacity of the raw coal hopper is always changed due to the fact that the wall-hanging coal hopper has the situation.
In addition to calculating the theoretical volume based on the design shape and size, the following test method is generally used to calculate the actual volume of the raw coal hopper, and the prior art calculation method generally includes: and in the running test process, recording the coal level B of the raw coal hopper at the starting time and the coal level A of the raw coal hopper at the ending time, and calculating the actual capacity between the coal levels A and B of the raw coal hopper according to the formula.
However, due to the fact that the actual capacity of the container equipment changes in real time, the existing method cannot dynamically monitor in real time, is poor in timeliness, needs to update data frequently and manually, cannot solve the problem that the actual capacity of the raw coal bunker of the thermal power plant cannot be actually measured and calculated due to frequent changes, cannot solve the problem that the capacity of the raw coal bunker of the thermal power plant cannot be dynamically monitored in real time, and cannot solve the problem that the combustible time of the coal stored in the raw coal bunker of the thermal power plant cannot be calculated.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for improving the capacity of a raw coal hopper.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving the capacity of a raw coal hopper comprises the following steps:
installing a heavy hammer level meter on a raw coal hopper for acquiring the level data information of the raw coal hopper in real time;
the method comprises the following steps of mounting a weighing type coal feeder on a raw coal hopper, and obtaining real-time coal feeding amount data information of the coal feeder in real time;
marking the moment A as an initial moment, and recording data information X of the raw coal hopper material level at the moment A;
marking the moment B as the end moment, and recording data information Y of the raw coal hopper material level at the moment B;
acquiring the average coal feeding amount Z of the weighing coal feeder from the moment A to the moment B;
and calculating the data to obtain the actual capacity T of the raw coal hopper material levels X to Y.
Preferably, the weight level indicator comprises a probe sensor, a sensing hammer, an internal encoder and an embedded processor, and the measurement of the weight level indicator comprises the following steps:
the probe sensor controls the induction hammer to quickly descend to the surface of the raw coal hopper material;
the induction hammer returns to the position to be measured once contacting the material surface of the measured object;
the internal encoder sends out a pulse signal corresponding to the displacement of the induction hammer;
after the operation of the embedded processor, a 4-20 mA standard signal corresponding to the material level is output, and the relation is as follows:
wherein H is the height of the storage bin, M is the actual measurement distance, I is the output current value, and H-M is the actual material level height.
Preferably, the weighing coal feeder comprises a rubber belt, a weighing bridge frame, a weighing display instrument and the like, and the real-time coal feeding amount measurement of the weighing coal feeder comprises the following steps:
the raw coal is dragged to run by the rubber belt, and the gravity of the raw coal and the friction force between the rubber belt promote the weighing coal feeder to continuously and uniformly feed the coal;
the weighing bridge frame detects the material on the adhesive tape and generates an electric signal, and the weighing display instrument receives the electric signal;
the weighing display instrument amplifies, shapes, converts and integrates the received electric signals, and the accumulated quantity and the instantaneous quantity of the conveyed raw coal are displayed on the weighing display instrument.
Preferably, the calculation formula of the average coal feeding amount Z is as follows:
the | Zb-ZaI is the total coal feeding amount of the weighing coal feeder from the moment A to the moment B, and t isb-taAnd the calculation formula of the actual capacity of the raw coal hopper material levels from X to Y is as follows: t ═ B-a) × Z.
Preferably, the amount of coal fed is in tons per hour, i.e. the amount of coal supplied to the furnace of the boiler per hour, and the level of the solid material in the container means is referred to as the height of the solid material.
Preferably, a weighing carrier roller and a weighing sensor are installed below the adhesive tape, the weighing bridge is provided with the weighing sensor, and the weighing bridge supports the weighing carrier roller.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for improving the capacity of the raw coal hopper successfully realizes real-time measurement of the actual capacity of the raw coal hopper which changes continuously, solves the problem that the combustible time of the coal stored in the raw coal hopper cannot be calculated, enables the amount of blended coal of various coal types to be refined, better controls the combustion cost, obtains expected economic benefits, obtains competitive advantages for enterprises in increasingly competitive markets, and is beneficial to the sustainable development of the enterprises.
2. Through the measuring method of the heavy hammer charge level indicator, the reliability of the measuring result is guaranteed, the influence of parameters such as dust, humidity and dielectric constant on the measurement can be avoided, and due to the advantages of simple design, convenience in installation and use and long service life, the use cost and the replacement cost are indirectly saved.
3. The method for measuring the real-time coal feeding amount by the weighing coal feeder ensures the accuracy of the real-time coal feeding amount measurement, provides a premise for smooth implementation of the steps of the method for improving the capacity of the raw coal hopper, indirectly saves the application cost of the method because the weighing coal feeder is convenient to operate and maintain, and promotes the practical application and popularization of the method.
Drawings
FIG. 1 is a flow chart illustrating the steps of a method for increasing the capacity of a raw coal bunker according to the present invention;
FIG. 2 is a flow chart illustrating the operation of a weight level gauge in the method for increasing the capacity of a raw coal bunker according to the present invention;
FIG. 3 is a flow chart of the operation of a weighing coal feeder in the method for increasing the capacity of a raw coal bunker according to the present invention;
FIG. 4 is a schematic diagram of an embodiment of a method for increasing the capacity of a raw coal bunker according to the present invention;
fig. 5 is a diagram of an embodiment of a method for increasing the capacity of a raw coal bunker according to the present invention.
Detailed Description
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, and not all of the embodiments.
Referring to fig. 1, a method for increasing the capacity of a raw coal bunker includes the following steps: the method comprises the steps of firstly, installing a heavy hammer material level meter on a raw coal hopper and used for acquiring real-time raw coal hopper material level data information, secondly, installing a weighing type coal feeder on the raw coal hopper and used for acquiring real-time coal feeding amount data information of the coal feeder in real time, thirdly, marking the time A as the initial time, recording the data information X of the raw coal hopper material level at the time A, fourthly, marking the time B as the final time, recording the data information Y of the raw coal hopper material level at the time B, fifthly, acquiring the average coal feeding amount Z of the weighing type coal feeder from the time A to the time B, and sixthly, calculating the data and acquiring the actual capacity T of the raw coal hopper material levels X to Y.
It should be noted that, referring to fig. 4, the calculation formula of the average coal supply amount Z is:
|Zb-Zai is the total coal feeding quantity of the weighing coal feeder from the moment A to the moment B, tb-taThe calculation formula of the actual capacity of the raw coal hopper material levels from X to Y is shown as the time difference from the A moment to the B moment: t ═ B-a) × Z.
Secondly, the unit of the coal feeding amount is ton/hour, namely the coal consumption supplied to the hearth of the boiler per hour, and the material level refers to the height of solid materials in the container equipment.
The method for improving the capacity of the raw coal hopper successfully realizes real-time measurement of the actual capacity of the raw coal hopper which changes continuously, solves the problem that the combustible time of the coal stored in the raw coal hopper cannot be calculated, enables the amount of blended coal of various coal types to be refined, better controls the combustion cost, obtains expected economic benefits, obtains competitive advantages for enterprises in increasingly competitive markets, and is beneficial to the sustainable development of the enterprises.
Referring to FIG. 2, the weight level indicator comprises a probe sensor, a sensing hammer, an internal encoder and an embedded processor, and the measurement of the weight level indicator comprises the following steps: the method comprises the following steps that firstly, a probe sensor controls an induction hammer to rapidly descend to the surface of a raw coal hopper material, secondly, the induction hammer immediately returns to a position to be detected once contacting the surface of the detected material, thirdly, an internal encoder sends out a pulse signal corresponding to the displacement of the induction hammer, fourthly, after operation of an embedded processor, a 4-20 mA standard signal corresponding to the material level is output, and the relation formula is as follows:
wherein H is the height of the storage bin, M is the actualThe measuring distance, the I output current value and the H-M actual material level height are measured, the reliability of a measuring result is guaranteed by the measuring method of the heavy hammer material level meter, the influence of parameters such as dust, humidity and dielectric constant on measurement can be avoided, the heavy hammer material level meter is simple in design and convenient to install and use, and meanwhile, the use cost and the replacement cost are indirectly saved due to the advantage of long service life.
Referring to fig. 3, the weighing coal feeder comprises an adhesive tape, a weighing bridge frame, a weighing display instrument and the like, and the real-time coal feeding amount measurement of the weighing coal feeder comprises the following steps: the method comprises the steps of firstly, dragging raw coal by using an adhesive tape, enabling a weighing coal feeder to continuously and uniformly feed coal by using the gravity of the raw coal and the friction force between the raw coal and the adhesive tape, secondly, detecting materials on the adhesive tape by using a weighing bridge frame and generating electric signals, receiving the electric signals by using a weighing display instrument, and thirdly, displaying the cumulant and the instantaneous quantity of the conveyed raw coal on the weighing display instrument by using the weighing display instrument through amplification, shaping, conversion and integral operation.
It should be added that the weighing carrier roller and the weighing sensor are installed below the adhesive tape, the weighing sensor is installed on the weighing bridge, and the weighing carrier roller is supported by the weighing bridge.
The method for measuring the real-time coal feeding amount by the weighing coal feeder ensures the accuracy of the real-time coal feeding amount measurement, provides a premise for smooth implementation of the steps of the method for improving the capacity of the raw coal hopper, indirectly saves the application cost of the method because the weighing coal feeder is convenient to operate and maintain, and promotes the practical application and popularization of the method.
The maximum material level of the raw coal hopper is assumed to be 10 meters, and the material level range is 0-10 meters.
Example 1: the method includes the steps of monitoring and recording the raw coal hopper material level and the coal feeding amount of a corresponding coal feeder in real time, calculating according to recorded data, building a database, defining the size of the database according to conditions, wherein the database size takes the case of recording 24-hour data, recording data once every minute (or recording once every second, and the like), recording 24 x 60 to 1440 data at each measuring point in the database, recording the data at the last position when 1441 data is generated after the database is set as a dynamic database, clearing the first data arranged at the most front position, namely recording 2 nd to 1441 data in the database, recording the latest 1440 data in the database along with the lapse of time, and continuously judging and calculating the raw coal hopper amount by using the 1440 data.
For example, the coal quantity of the raw coal hopper with the material level of 5-6 meters is calculated, and the material level is X1，X2，X3……X1440The coal feeding amount corresponding to the coal feeder is Y1，Y2，Y3……Y1440If X is1≥6，X2<6, record X1Time of (a) is T1If X is100≥5，X101<4, record X100Time of (a) is T2I.e. the time taken for the material level of the raw coal hopper to descend from 6 meters to 5 meters is T2-T1Taking T1To T2Coal feeding amount Y (Y) corresponding to coal feeder in time period1To Y100Average of all data), the actual coal amount at a raw coal hopper level of 5 to 6 m is G ═ Y × (T)2-T1) By analogy, the raw coal reserves of other each stock level section can be calculated, the more the divided sections are, the more accurate the calculation is, and it needs to be specially stated that before calculation and analysis, a judgment is made: x1To X101Whether or not it is decreasing, only if X is decreasing1To X101If the situation is increased gradually, new coal is added into the raw coal bunker, the whole data is abandoned, no calculation is performed, the next data meeting the conditions is searched continuously for calculation, the final calculation result can be recorded into another database (raw coal bunker coal quantity data), 1440 data are collected dynamically, if the new calculation result is generated, the previous calculation result can be covered, so that the raw coal bunker coal quantity data are updated continuously, and referring to fig. 5, the sectional coal quantities of ten raw coal bunkers from 1A to 2E are obtained according to the calculation method.
According to the data in fig. 5, the actual raw coal amount Z corresponding to the material level of any raw coal hopper can be calculated by using the piecewise function.
Calculating the available time of the residual coal in the raw coal hopper, predicting the average coal consumption in the future time or calculating the current real-time coal supply data of a weighing coal feeder, wherein the data is A tons/hour, and the available time of the residual coal in the raw coal hopper is
(hours). T + initial time-all coal amount used up time.
Referring to the second data in fig. 4, when the raw coal bunker has a material level of 3 meters, a coal supply amount of 30 tons/hour, and a current time of 14:00, the method of the present invention calculates that the coal amount left in the raw coal bunker is 15:35, then predicts that high-quality coal will be used after 15:35, and at the same time, the high-quality coal needs to be burnt to 18:30, and predicts that the coal supply amount of 15:35 to 18:30 is 38 tons/hour, and the total coal amount needed is 38 × (18:30-15:35) × (87.5 tons), and calculates the material level of the raw coal bunker from 4 to H meters by using a function to 87.5 tons, and obtains H, that is, the newly increased coal amount enters the raw coal bunker now, and the raw coal bunker level is increased to H meters, and the required requirement can be met, for example, H is 5.1 (meters) shown in fig. 4.
In the present invention, the functional principle can be illustrated by the following operation modes:
the method comprises the steps of firstly, installing a heavy hammer material level meter on a raw coal hopper and used for acquiring real-time raw coal hopper material level data information, secondly, installing a weighing type coal feeder on the raw coal hopper and used for acquiring real-time coal feeding amount data information of the coal feeder in real time, thirdly, marking the time A as the initial time, recording the data information X of the raw coal hopper material level at the time A, fourthly, marking the time B as the final time, recording the data information Y of the raw coal hopper material level at the time B, fifthly, acquiring the average coal feeding amount Z of the weighing type coal feeder from the time A to the time B, and sixthly, calculating the data and acquiring the actual capacity T of the raw coal hopper material levels X to Y.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A method for increasing the capacity of a raw coal hopper is characterized by comprising the following steps:
installing a heavy hammer level meter on a raw coal hopper for acquiring the level data information of the raw coal hopper in real time;
the method comprises the following steps of mounting a weighing type coal feeder on a raw coal hopper, and obtaining real-time coal feeding amount data information of the coal feeder in real time;
marking the moment A as an initial moment, and recording data information X of the raw coal hopper material level at the moment A;
marking the moment B as the end moment, and recording data information Y of the raw coal hopper material level at the moment B;
acquiring the average coal feeding amount Z of the weighing coal feeder from the moment A to the moment B;
and calculating the data to obtain the actual capacity T of the raw coal hopper material levels X to Y, and then realizing the improvement of the raw coal hopper capacity by obtaining the actual capacity T of the raw coal hopper material levels X to Y.
2. The method as claimed in claim 1, wherein the weight level indicator comprises a probe sensor, a sensing hammer, an internal encoder, and an embedded processor, and the measuring of the weight level indicator comprises the following steps:
the probe sensor controls the induction hammer to quickly descend to the surface of the raw coal hopper material;
the induction hammer returns to the position to be measured once contacting the material surface of the measured object;
the internal encoder sends out a pulse signal corresponding to the displacement of the induction hammer;
after the operation of the embedded processor, a 4-20 mA standard signal corresponding to the material level is output.
3. The method for improving the capacity of the raw coal hopper according to claim 1, wherein the weighing coal feeder comprises an adhesive tape, a weighing bridge frame, a weighing display instrument and the like, and the real-time coal feeding quantity measurement of the weighing coal feeder comprises the following steps:
the raw coal is dragged to run by the rubber belt, and the gravity of the raw coal and the friction force between the rubber belt promote the weighing coal feeder to continuously and uniformly feed the coal;
the weighing bridge frame detects the material on the adhesive tape and generates an electric signal, and the weighing display instrument receives the electric signal;
the weighing display instrument amplifies, shapes, converts and integrates the received electric signals, and the accumulated quantity and the instantaneous quantity of the conveyed raw coal are displayed on the weighing display instrument.
4. The method for increasing the capacity of the raw coal bunker according to claim 1, wherein the average coal feeding quantity Z is calculated by the following formula:
the | Zb-ZaAnd l is the total coal feeding amount of the weighing coal feeder from the moment A to the moment B.
5. The method as claimed in claim 1, wherein the coal feeding amount is in tons per hour, that is, the amount of the coal supplied to the furnace of the boiler per hour, and the material level is the height of the solid material in the container device.
6. The method for increasing the capacity of the raw coal hopper according to claim 2, wherein the relation of the operation process of the embedded processor is as follows:
wherein H is the height of the storage bin, M is the actual measurement distance, I is the output current value, and H-M is the actual material level height.
7. The method for increasing the capacity of the raw coal hopper according to claim 3, wherein a weighing idler and a weighing sensor are mounted below the adhesive tape, a weighing sensor is mounted on the weighing bridge, and the weighing idler is supported by the weighing bridge.
8. The method as claimed in claim 4, wherein t is the amount of coal in the hopperb-taAnd the calculation formula of the actual capacity of the raw coal hopper material levels from X to Y is as follows: t ═ B-a) × Z.
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| CN112199867A (en) * | 2020-11-19 | 2021-01-08 | 华能秦煤瑞金发电有限责任公司 | System and method for automatically calculating coal type switching time in coal bunker |
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