CN112465668A - Method and device for setting positive-pressure pneumatic ash conveying time and terminal equipment - Google Patents
Method and device for setting positive-pressure pneumatic ash conveying time and terminal equipment Download PDFInfo
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- 239000003546 flue gas Substances 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/06—Gas pressure systems operating without fluidisation of the materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
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- G06Q50/06—Electricity, gas or water supply
Abstract
The invention is suitable for the technical field of energy, and provides a method and a device for setting positive pressure pneumatic ash conveying time and terminal equipment, wherein the method comprises the following steps: acquiring a first ash conveying operation cost in the current ash conveying interval time; detecting the real-time material level and the real-time temperature of the ash hopper based on the current ash conveying interval time; adjusting the ash conveying interval time in real time according to the real-time material level and the real-time temperature; acquiring a second ash conveying operation cost after the ash conveying interval time is adjusted; and determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjusting the optimal ash conveying interval time. The invention solves the problem of unreasonable ash conveying time setting in the prior art by setting reasonable ash conveying time, so that the operation mode is changed according to the change of working conditions, and scientific guidance can be provided for specific boiler ash conveying operation.
Description
Technical Field
The invention belongs to the technical field of energy, and particularly relates to a method and a device for setting positive pressure pneumatic ash conveying time and terminal equipment.
Background
At present, fly ash carried in flue gas is removed by a dust remover in the modes of static electricity, cloth bags and the like in a fixed fuel thermal power plant, most of dust removing and conveying systems adopt a positive pressure pneumatic conveying mode to convey powdery materials, the fly ash is separated from the flue gas, settled and collected to an ash hopper at the lower part of the dust remover, and then discharged out of the dust remover through a bin pump at the bottom of the ash hopper and the like.
In the positive pressure pneumatic ash conveying system, ash conveying is completed in a program control mode, and an ash conveying bin pump operates according to units. The ash conveying interval time is controlled according to a set discharge period (setting time) or by a material level signal. The setting time is generally set at the initial stage of production and has no function of timely adjusting according to the actual operation condition of the unit. The ash conveying effect cannot be achieved due to too long ash conveying interval time, so that material level alarm is caused; too short an ash conveying interval increases the operating cost of ash conveying.
The feeding time of the bin pump is set by either time setting or material level alarming, the time setting is generally set manually, and most of the time setting is a fixed value. However, the actual ash amount is in direct proportion to the load of the unit, the ash amount under low load is necessarily reduced, if the feeding time of the original bin pump is still kept, the ash falling in the bin pump is correspondingly reduced, the actual ash-air ratio is reduced, and the utilization rate of compressed air is reduced. In the ash conveying process, the ash conveying process time (the sum of the conveying time and the exhaust time) cannot be maintained for a long time; too long a period of time in the ash conveying process will result in lower actual ash-gas ratio, which also results in lower utilization of compressed air.
Disclosure of Invention
In view of the above, the invention provides a method, a device and a terminal device for setting positive pressure pneumatic ash conveying time, which are used for reasonably adjusting the ash conveying time (ash conveying interval time and ash conveying time, wherein the ash conveying time is the sum of the feeding time and the ash conveying process time) of an ash conveying system by calculating the ash conveying operation cost in the ash conveying interval time and detecting the real-time material level, the real-time temperature, the ash conveying pressure, the real-time load of a unit and the temperature of a bin pump of an ash hopper, so that the problem of unreasonable ash conveying time setting in the prior art is solved, the operation mode is changed according to the change of working conditions, and scientific guidance can be provided for the specific ash conveying operation of a boiler.
The first aspect of the embodiment of the invention provides a method for setting positive pressure pneumatic ash conveying time, which comprises the following steps:
acquiring a first ash conveying operation cost in the current ash conveying interval time;
detecting real-time material level and real-time temperature of an ash hopper based on the current ash conveying interval time, wherein the real-time temperature is used for judging whether the real-time material level is accurate or not;
adjusting the ash conveying interval time of the ash hopper in real time according to the real-time material level and the real-time temperature;
acquiring a second ash conveying operation cost after the ash conveying interval time is adjusted;
and determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjusting the optimal ash conveying interval time.
In some embodiments, determining, based on the first ash conveying operation cost and the second ash conveying operation cost, that the ash conveying interval time corresponding to the minimum ash conveying operation cost is an optimal ash conveying interval time, and after adjusting to the optimal ash conveying interval time, the method further includes:
determining the feeding time of each bin pump according to the real-time load of the unit;
controlling the length of the ash conveying process of each bin pump according to the lower limit threshold of the pressure of the ash conveying pipeline;
and determining the ash conveying time of each bin pump according to the feeding time and the ash conveying process time.
In some embodiments, obtaining the first ash conveying operation cost in the current ash conveying interval time specifically includes:
acquiring total ash conveying compressed air consumption, total ash bucket heating energy consumption and total ash removal system electricity consumption based on the current ash conveying interval time;
multiplying the total ash conveying compressed air consumption by the unit cost of the compressed air to obtain the total compressed air cost;
multiplying the total heating energy consumption of the ash bucket by the unit price of the energy source to obtain the total heating cost of the ash bucket;
multiplying the total power consumption of the ash removal system by the unit price of the station service power to obtain the total cost of the ash removal power consumption;
and the total cost of the compressed air plus the total cost of the ash hopper heating plus the total cost of the ash removal electricity consumption is added to obtain a first ash conveying operation cost.
In some embodiments, the adjusting the ash conveying interval time of the ash hopper in real time according to the real-time material level and the real-time temperature specifically includes:
judging whether the ash bucket is blocked or not to give an alarm according to the real-time material level and the real-time temperature;
if so, shortening the ash conveying interval time;
if not, prolonging the ash conveying interval time.
In some embodiments, determining, based on the first ash conveying operation cost and the second ash conveying operation cost, that the ash conveying interval time corresponding to the minimum ash conveying operation cost is the optimal ash conveying interval time specifically includes:
comparing the first ash conveying operation cost with the second ash conveying operation cost;
if the first ash conveying operation cost is larger than the second ash conveying operation cost, prolonging the ash conveying interval time, and returning to the step to obtain the first ash conveying operation cost in the current ash conveying interval time;
and if the first ash conveying operation cost is less than the second ash conveying operation cost, determining the ash conveying interval time corresponding to the first ash conveying operation cost as the optimal ash conveying interval time, and adjusting the optimal ash conveying interval time.
In some embodiments, the feed time period is calculated by the formula:
wherein Mmax is the coal consumption of the unit under full load, and the unit is t/h; l is the unit load under the actual condition, and the unit is MW; tmax is the full load of the unit, T is the feeding duration of the bin pump, and the unit is s.
In some embodiments, after determining the ash conveying time length of each bin pump according to the feeding time length and the ash conveying process time length, the method further comprises the following steps:
judging whether the ash conveying process is finished or not under the ash conveying duration according to the temperature of the bin pump;
if the temperature of the bin pump meets the preset conditions, the ash conveying process is smoothly finished.
In a second aspect of the embodiments of the present invention, there is provided a device for setting positive pressure pneumatic ash conveying time, including:
the first cost calculation module is configured to obtain a first ash conveying operation cost in the current ash conveying interval time;
the detection module is configured to detect a real-time material level and a real-time temperature of an ash bucket based on the current ash conveying interval time, wherein the real-time temperature is used for judging whether the real-time material level is accurate or not;
the time adjusting module is configured to adjust the ash conveying interval time of the ash hopper in real time according to the real-time material level and the real-time temperature;
a second cost calculation module configured to obtain a second ash conveying operation cost after the ash conveying interval time is adjusted;
and the optimal time determining module is configured to determine the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjust the optimal ash conveying interval time.
In a third aspect of the embodiments of the present invention, there is provided a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method for setting the positive pressure pneumatic ash conveying time when executing the computer program.
In a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, where a computer program is stored, and the computer program, when being executed by a processor, implements the steps of the method for setting positive pressure pneumatic ash conveying time.
The method for setting the positive pressure pneumatic ash conveying time provided by the embodiment of the invention has the beneficial effects that at least: the embodiment of the invention provides a method for setting positive-pressure pneumatic ash conveying time, which is characterized in that a first ash conveying operation cost in the current ash conveying interval time is obtained; secondly, detecting the real-time material level and the real-time temperature of the ash bucket based on the current ash conveying interval time; adjusting the ash conveying interval time in real time according to the real-time material level and the real-time temperature; then obtaining a second ash conveying operation cost after the ash conveying interval time is adjusted; and finally, determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjusting the optimal ash conveying interval time. The invention sets reasonable ash conveying interval time by calculating the ash conveying operation cost in the ash conveying interval time and detecting the real-time material level and the real-time temperature of the ash hopper, thereby solving the problems of material level alarm and overhigh ash conveying operation cost caused by unreasonable ash conveying interval time. The invention also reasonably sets the ash conveying time of each bin pump according to the real-time load of the unit and the lower limit threshold of the pressure of the ash conveying pipeline, thereby solving the problems of low ash gas ratio and low utilization rate of compressed air caused by unreasonable ash conveying time. Aiming at the problem that the ash conveying time (ash conveying interval and ash conveying time) in the positive-pressure pneumatic ash conveying system is unreasonable, the ash conveying interval and the ash conveying time are reasonably adjusted by calculating the ash conveying operation cost in the ash conveying interval time and detecting the real-time material level, the real-time temperature, the ash conveying pressure, the real-time load of a unit and the temperature of a bin pump, so that the operation is changed according to the change of working conditions, scientific guidance can be provided for the concrete ash conveying operation of a boiler, the ash-gas ratio is improved, the ash conveying operation cost is reduced, the service life of an ash conveying pipeline is prolonged, and the effects of safe operation of equipment, energy conservation and consumption reduction are achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for setting positive pressure pneumatic ash conveying time according to an embodiment of the present invention;
FIG. 2 is a flowchart for implementing the process of obtaining the first ash conveying operation cost in the current ash conveying interval according to the embodiment of the present invention;
FIG. 3 is a flow chart for adjusting the ash conveying interval of the ash hopper according to the real-time material level and the real-time temperature;
FIG. 4 is a flow chart of an embodiment of the present invention for determining an optimal ash conveying interval;
FIG. 5 is a flow chart of a method for setting the positive pressure pneumatic ash conveying duration according to an embodiment of the present invention;
FIG. 6 is a flow chart of the setting device for positive pressure pneumatic ash conveying time according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
First embodiment
Fig. 1 is a flowchart of a method for setting positive pressure pneumatic ash conveying time according to an embodiment of the present invention.
As shown in fig. 1, the method for setting the positive pressure pneumatic ash conveying time includes steps S110 to S150:
s110: acquiring a first ash conveying operation cost in the current ash conveying interval time;
s120: detecting the real-time material level and the real-time temperature of the ash hopper based on the current ash conveying interval time;
s130: adjusting the ash conveying interval time of the ash hopper in real time according to the real-time material level and the real-time temperature;
s140: acquiring a second ash conveying operation cost after the ash conveying interval time is adjusted;
s150: and determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjusting the optimal ash conveying interval time.
The embodiment of the invention provides a method for setting positive-pressure pneumatic ash conveying time, which is characterized in that a first ash conveying operation cost in the current ash conveying interval time is obtained; secondly, detecting the real-time material level and the real-time temperature of the ash bucket based on the current ash conveying interval time; adjusting the ash conveying interval time in real time according to the real-time material level and the real-time temperature; then obtaining a second ash conveying operation cost after the ash conveying interval time is adjusted; and finally, determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjusting the optimal ash conveying interval time. The method aims at the problem that the ash conveying interval time in the positive-pressure pneumatic ash conveying system is unreasonable, reasonable ash conveying interval time is set by calculating the ash conveying operation cost in the ash conveying interval time and detecting the real-time material level and the real-time temperature of the ash hopper, and the problems of material level alarm and overhigh ash conveying operation cost caused by unreasonable ash conveying interval time are solved. Can provide scientific guidance for concrete boiler ash conveying operation, improve the ash-gas ratio and prolong the service life of an ash conveying pipeline, thereby achieving the effects of safe operation of equipment, energy conservation and consumption reduction.
Specifically, please refer to fig. 2 for a specific implementation method for obtaining the first ash conveying operation cost in the current ash conveying interval time, and fig. 2 is a flowchart for obtaining the first ash conveying operation cost in the current ash conveying interval time according to an embodiment of the present invention.
As shown in fig. 2, obtaining the first ash conveying operation cost in the current ash conveying interval time may include the following steps S210-S250:
s210, acquiring total ash conveying compressed air consumption, total ash bucket heating energy consumption and total ash removal system electricity consumption based on the current ash conveying interval time;
s220, multiplying the total ash conveying compressed air consumption by the unit cost of the compressed air to obtain the total compressed air cost;
s230, multiplying the total energy consumption of ash bucket heating by the unit price of energy sources to obtain the total ash bucket heating cost;
s240, multiplying the total power consumption of the ash removal system by the unit price of the station service power to obtain the total cost of the ash removal power consumption;
and S250, adding the total cost of the compressed air and the total cost of the ash hopper heating and the total cost of the ash removal power consumption to obtain a first ash conveying operation cost.
Specifically, before the step S110 obtains the first ash conveying operation cost in the current ash conveying interval time, the method further includes: the initial ash conveying interval time is set, and can be determined according to experience.
Specifically, the first ash conveying operation cost in the current ash conveying interval time can be based on the current ash conveying interval time to obtain the total ash conveying compressed air consumption, the total ash hopper heating energy consumption and the total ash removal system electricity consumption; then calculating the total cost of the compressed air, the total cost of the ash bucket heating and the total cost of the ash removal electricity consumption; and finally, the total cost of the compressed air plus the total cost of the ash hopper heating plus the total cost of the ash removal electricity consumption is added to obtain a first ash conveying operation cost.
In particular, the ash conveying operation costs in other ash conveying intervals in the present invention can also be obtained through steps S210-250.
Specifically, step S120 determines whether the current ash conveying interval time setting is reasonable by detecting the real-time material level and the real-time temperature of the ash hopper at the current ash conveying interval time. In actual engineering, the ash bucket generally uses the on-off level indicator, and when the ash volume is great or the ash bucket hardens, the material level shows that the change is big, can not accurately show material level or other abnormal conditions, all can lead to real-time material level not to reach the material level warning requirement but takes place the alarm phenomenon, and the real-time material level of gathering through the sensor at this moment is not conform to actual conditions. The current ash bucket system does not have temperature measurement and monitoring, can install temperature sensor in the ash bucket system and realize the temperature measurement and the monitoring to the ash bucket system, can also come the analysis real-time material level condition through the real-time temperature of ash bucket. In the ash conveying process, the temperature of dust in the ash hopper is greatly higher than the ambient air temperature, so that whether the real-time material level meets the actual condition or not is judged by acquiring the real-time temperature at the inlet of the ash hopper through the temperature sensor. If the collected real-time temperature is greatly lower than the dust temperature, a material level alarm phenomenon occurs, which indicates that the collected real-time material level is not in accordance with the actual situation at the moment, and the real-time material level in accordance with the actual situation is obtained after abnormal treatment.
Specifically, the specific implementation steps of the step S130 of adjusting the ash conveying interval time of the ash bucket in real time according to the real-time material level and the real-time temperature please refer to fig. 3, and fig. 3 is a flow implementation diagram of adjusting the ash conveying interval time of the ash bucket in real time according to the real-time material level and the real-time temperature in an embodiment of the present invention.
As shown in fig. 3, adjusting the ash conveying interval time of the ash hopper in real time according to the real-time material level and the real-time temperature may specifically include the following steps S310 to S330:
s310, judging whether the ash bucket is blocked or not to give an alarm according to the real-time material level and the real-time temperature;
s320, if yes, shortening the ash conveying interval time;
s330, if not, prolonging the ash conveying interval time.
Specifically, the real-time temperature is used for judging whether the real-time material level is accurate or not. Judging whether the ash bucket is blocked or not to give an alarm according to the real-time material level and the real-time temperature at the current ash conveying interval time, if so, firstly judging whether the real-time material level is accurate or not, shortening the ash conveying interval time accurately, and if not, processing the abnormality in the ash bucket so as to obtain accurate real-time material level; if the material level is not alarmed, prolonging the ash conveying interval time.
Specifically, in step S150, based on the first ash conveying operation cost and the second ash conveying operation cost, a specific implementation step of determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time, and adjusting the ash conveying interval time to the optimal ash conveying interval time is shown in fig. 4, where fig. 4 is a flowchart of a method for determining the optimal ash conveying interval time provided in an embodiment of the present invention.
As shown in fig. 4, determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjusting to the optimal ash conveying interval time may specifically include the following steps S410 to S430:
s410, comparing the first ash conveying operation cost with the second ash conveying operation cost;
s420, if the first ash conveying operation cost is larger than the second ash conveying operation cost, prolonging the ash conveying interval time, and returning to the step to obtain the first ash conveying operation cost in the current ash conveying interval time;
and S430, if the first ash conveying operation cost is less than the second ash conveying operation cost, determining the ash conveying interval time corresponding to the first ash conveying operation cost as the optimal ash conveying interval time, and adjusting the optimal ash conveying interval time.
Specifically, in order to determine the optimal ash conveying interval time, the ash conveying interval time needs to be adjusted repeatedly according to the real-time material level of the ash hopper, the real-time temperature condition and the ash conveying operation cost, and steps S110-S150 need to be repeated every time of adjustment. Specifically, adjusting the ash conveying interval time in real time according to the real-time material level and the real-time temperature; judging whether the ash bucket is blocked or not to give an alarm according to the real-time material level and the real-time temperature at the current ash conveying interval time, if so, firstly judging whether the real-time material level is accurate or not, shortening the ash conveying interval time accurately, and if not, processing the abnormality in the ash bucket so as to obtain accurate real-time material level; if the material level is not alarmed, prolonging the ash conveying interval time. And then determining that the ash conveying interval time corresponding to the first ash conveying operation cost is the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and if the first ash conveying operation cost is greater than the second ash conveying operation cost, prolonging the ash conveying interval time. Continuously detecting the real-time material level and real-time temperature condition of the lengthened ash conveying interval time, if the material level is alarmed after the lengthened ash conveying interval time, accurately shortening the ash conveying interval time by judging whether the real-time material level is accurate, wherein the shortened ash conveying interval time is half of the last lengthened ash conveying interval time; if the material is inaccurate, processing the abnormity in the ash bucket so as to obtain accurate real-time material degree; on the contrary, if the material level is not alarmed, the ash conveying interval time is prolonged, and similarly, the prolonged ash conveying interval time is half of the last prolonged ash conveying interval time.
Specifically, in order to ensure the accuracy of the optimal ash conveying interval time, when the first ash conveying operation cost and the second ash conveying operation cost are judged for the first time, if the second ash conveying operation cost is greater than the first ash conveying operation cost, the ash conveying interval time is shortened. And (4) calculating the ash conveying operation cost within a fixed time under the condition of shortening the ash conveying interval time, if the ash conveying operation cost is reduced, repeating the steps S110-S150 until the ash conveying operation cost is increased for the second time, and determining the ash conveying interval time at the moment as the optimal ash conveying interval time. When the ash conveying interval time is adjusted for the second time, the ash conveying interval time can be prolonged or reduced by half of the change of the ash conveying interval time for the first time. When the ash conveying interval time is adjusted subsequently, the adjustment amount can be half of the previous time. It should be noted that, in the present embodiment, when the ash conveying interval time is adjusted, the ash conveying interval time which is increased or decreased for the second time is half of the last ash conveying interval time which is adjusted, and the actual application is not limited to half, and any value excluding 0 and 1 may be included in the range of 0 to 1.
In this embodiment, the method obtains the ash conveying operation cost at the ash conveying interval time through the existing ash conveying interval time, detects the real-time material level and the real-time temperature of the ash hopper at the ash conveying operation cost, appropriately prolongs or shortens the ash conveying interval time according to the real-time material level and the real-time temperature of the ash hopper, obtains the ash conveying operation cost after the ash conveying interval time is adjusted, and judges whether the ash conveying operation cost after the ash conveying interval time is adjusted is lower than the initially obtained ash conveying operation cost, so as to determine the optimal ash conveying interval time and adjust the optimal ash conveying interval time. By improving the scientificity and rationality of setting the optimal ash conveying interval time, the problems of excessive material level alarm and ash conveying operation cost caused by unreasonable ash conveying interval time are solved. Can provide scientific guidance for concrete boiler ash conveying operation, improve the ash-gas ratio and prolong the service life of an ash conveying pipeline, thereby achieving the effects of safe operation of equipment, energy conservation and consumption reduction.
In particular, in practical engineering, the volume of the bin pump is larger than that of the ash bucket, so that the optimal ash conveying interval time determined by the real-time material level and the real-time temperature of the ash bucket can be directly used for the ash conveying process of the bin pump. The bin pump is generally located at the lower side of the ash bucket, so the ash conveying starting time of the ash bucket is generally a difference of a few seconds before the ash conveying starting time of the bin pump.
Specifically, after step S150, a method for setting a positive pressure pneumatic ash conveying time length is further included, and the specific implementation steps of the method for setting a positive pressure pneumatic ash conveying time length refer to fig. 5, and fig. 5 is a flowchart of a method for setting a positive pressure pneumatic ash conveying time length provided in an embodiment of the present invention.
As shown in fig. 5, the method for setting the positive pressure pneumatic ash conveying time may specifically include the following steps S510 to S530:
s510, determining the feeding time of each bin pump according to the real-time load of the unit;
s520, controlling the ash conveying process duration of each bin pump according to the lower limit threshold of the ash conveying pipeline pressure;
s530, determining the ash conveying time of each bin pump according to the feeding time and the ash conveying process time.
Specifically, in the ash conveying process, the actual ash amount is in a direct proportional relation with the unit load, the ash amount under low load is necessarily reduced, and if the feeding time of the bin pump adopts a fixed value, the actual ash-air ratio is reduced when the ash falling in the bin pump is correspondingly reduced, so that the utilization rate of compressed air is reduced. A reasonable feeding time is set according to the actual load of the unit during ash conveying. The calculation formula of the feeding time length is found in engineering practice as follows:
wherein Mmax is the coal consumption of the unit under full load, and the unit is t/h; l is the unit load under the actual condition, and the unit is MW; tmax is the full load of the unit, T is the feeding duration of the bin pump, and the unit is s.
Specifically, the ash conveying process duration includes the total duration of ash conveying and exhaust, so the ash conveying process duration is the sum of the conveying duration and the exhaust duration. In the ash conveying process, the time length of the ash conveying process of each bin pump can be controlled according to the lower limit threshold of the pressure of the ash conveying pipeline; the lower threshold of the ash conveying pipe pressure can be determined empirically and can be, for example, 0.03 MPa. The fly ash in the bin pump is quickly conveyed away, the ash conveying process cannot be maintained for a long time, and the ash falling amount in the bin pump is low; too long ash conveying process time can cause lower actual ash gas ratio, thereby leading to the reduction of compressed air utilization ratio. Therefore, the ash-gas ratio and the utilization rate of the compressed air can be improved by setting the reasonable ash conveying process time.
Specifically, the ash conveying time of each bin pump includes the total time of feeding, ash conveying and exhausting, so the ash conveying time is the sum of the feeding time and the ash conveying process time. Aiming at the problem that the ash conveying duration in a positive pressure pneumatic ash conveying system is unreasonable, firstly, the feeding duration of each bin pump is determined according to the real-time load of a unit; secondly, controlling the length of the ash conveying process of each bin pump according to the lower limit threshold of the pressure of the ash conveying pipeline; and finally, determining the ash conveying time of each bin pump according to the feeding time and the ash conveying process time. The ash conveying device has the advantages that the ash conveying time is long through reasonable design, the ash-gas ratio and the compressed air utilization rate are improved, the ash conveying operation cost is reduced, the service life of an ash conveying pipeline is prolonged, and therefore the effects of safe operation of equipment, energy conservation and consumption reduction are achieved.
Specifically, in step S530, after determining the ash conveying time length of each bin pump according to the feeding time length and the ash conveying process time length, the method further includes: judging whether the ash conveying process is finished or not under the ash conveying duration according to the temperature of the bin pump; if the temperature of the bin pump meets the preset conditions, the ash conveying process is smoothly finished. In the current ash conveying system, a transmitter is easily blocked by ash and cannot accurately display; when the ash amount is small, the pressure change of the transmitter is not obvious, and operators are difficult to interpret and even misjudge; operators need to measure the temperature of the bin pump on the spot or indirectly judge whether the ash conveying of the bin pump is normal or not in a hand touch mode; can judge through at storehouse pump installation temperature sensor whether defeated grey process goes on smoothly to avoided being blockked up by the ash by the transformer and misjudge the defeated grey condition of unable correct judgement that the changer pressure leads to, also need not adopt to go on measuring storehouse pump temperature on the spot or fail the grey condition with the mode of touching, improved work efficiency. In the ash conveying process, the temperature of dust in the bin pump is greatly higher than the ambient air temperature, and the ash conveying process is judged to be successfully completed according to whether the temperature of the bin pump is greatly lower than the dust temperature. If the temperature of the bin pump is greatly lower than the temperature of the dust, the ash conveying process is smoothly finished; if the temperature of the bin pump is not greatly lower than the dust temperature, the ash conveying process is not finished smoothly, and a user can be reminded to handle the abnormal condition.
In the embodiment, aiming at the problem that the ash conveying time (ash conveying interval and ash conveying time) in the positive-pressure pneumatic ash conveying system is unreasonable, the ash conveying interval and the ash conveying time are reasonably adjusted by calculating the ash conveying operation cost in the ash conveying interval time and detecting the real-time material level of an ash hopper, the real-time temperature, the ash conveying pressure, the real-time load of a unit and the temperature of a bin pump, so that the operation mode is changed according to the change of working conditions, scientific guidance can be provided for specific boiler ash conveying operation, the ash-gas ratio is improved, the ash conveying operation cost is reduced, the service life of an ash conveying pipeline is prolonged, and the effects of safe operation of equipment and energy conservation and consumption reduction are achieved.
Second embodiment
Based on the same inventive concept as the method in the first embodiment, correspondingly, the embodiment also provides a device for setting the positive pressure pneumatic ash conveying time.
FIG. 6 is a flow chart of the setting device for positive pressure pneumatic ash conveying time provided by the invention.
As shown in fig. 6, the illustrated apparatus 6 includes: 61 a first cost calculation module, 62 a detection module, 63 a time adjustment module, 64 a second cost calculation module, and 65 an optimal time determination module.
The first cost calculation module is configured to obtain a first ash conveying operation cost in the current ash conveying interval time;
the detection module is configured to detect a real-time material level and a real-time temperature of an ash bucket based on the current ash conveying interval time, wherein the real-time temperature is used for judging whether the real-time material level is accurate or not;
the time adjusting module is configured to adjust the ash conveying interval time of the ash hopper in real time according to the real-time material level and the real-time temperature;
a second cost calculation module configured to obtain a second ash conveying operation cost after the ash conveying interval time is adjusted;
and the optimal time determining module is configured to determine the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjust the optimal ash conveying interval time.
In some exemplary embodiments, the first cost calculation module specifically includes:
the data acquisition unit is configured to acquire total ash conveying compressed air consumption, total ash bucket heating energy consumption and total ash removal system electricity consumption based on the current ash conveying interval time;
the compressed air total cost calculation unit is configured to multiply the ash conveying compressed air total consumption and the compressed air unit cost to obtain the compressed air total cost;
the ash bucket heating total cost calculation unit is configured to multiply the total energy consumption of ash bucket heating by the unit price of energy source to obtain the total ash bucket heating cost;
the ash removal power consumption total cost calculation unit is configured to multiply the total power consumption of the ash removal system and the unit price of the station service power to obtain the ash removal power consumption total cost;
and the first ash conveying operation cost calculation unit is configured to obtain a first ash conveying operation cost by adding the total cost of the compressed air and the total cost of the ash hopper heating and adding the total cost of the ash removal electricity consumption.
In some exemplary embodiments, the time adjustment module specifically includes:
the judging unit is configured to judge whether the ash bucket is blocked or not to give an alarm according to the real-time material level and the real-time temperature;
a time shortening unit configured to shorten the ash conveying interval time if yes;
and the time prolonging unit is configured to prolong the ash conveying interval time if not.
In some exemplary embodiments, the optimal time determination module specifically includes:
a cost comparison unit configured to compare magnitudes of the first ash conveying operation cost and the second ash conveying operation cost;
the first execution unit is configured to prolong the ash conveying interval time if the first ash conveying operation cost is larger than the second ash conveying operation cost, and return to the step to obtain the first ash conveying operation cost in the current ash conveying interval time;
and the second execution unit is configured to determine that the ash conveying interval time corresponding to the first ash conveying operation cost is the optimal ash conveying interval time and adjust the optimal ash conveying interval time if the first ash conveying operation cost is less than the second ash conveying operation cost.
In some exemplary embodiments, the apparatus further comprises:
the feeding duration acquisition module is configured to determine the feeding duration of each bin pump according to the real-time load of the unit, wherein the calculation formula of the feeding duration is as follows:
wherein Mmax is the coal consumption of the unit under full load, and the unit is t/h; l is the unit load under the actual condition, and the unit is MW; tmax is the feeding duration of the bin pump when the unit is fully loaded, and the unit is s;
the ash conveying process duration acquisition module is configured to control the ash conveying process duration of each bin pump according to the lower limit threshold of the ash conveying pipeline pressure;
the ash conveying time length acquisition module is configured to determine the ash conveying time length of each bin pump according to the feeding time length and the ash conveying process time length;
the judging module is configured to judge whether the ash conveying process is finished or not under the ash conveying duration according to the temperature of the bin pump;
and the execution module is configured to smoothly complete the ash conveying process if the temperature of the bin pump meets the preset condition.
Third embodiment
The method and the device can be applied to terminal equipment such as desktop computers, notebooks, palm computers and cloud servers.
Fig. 7 is a schematic diagram of a terminal device to which the above method and apparatus can be applied according to an embodiment of the present invention, and as shown in the drawing, the device 7 includes a memory 71, a processor 70, and a computer program 72 stored in the memory 71 and executable on the processor 70, and when the processor 70 executes the computer program 72, the steps of the method for setting the positive pressure pneumatic ash conveying time are implemented. Such as the functions of modules 61 to 65 shown in fig. 6.
The device 7 may be a computing device such as a cloud server. The terminal device may include, but is not limited to, the processor 70 and the memory 71. It will be appreciated by those skilled in the art that fig. 7 is merely an example of a device 7 and does not constitute a limitation of the terminal device 7, and may include more or less components than shown, or combine certain components, or different components, for example the terminal device may also include input output devices, network access devices, buses, etc.
The Processor 70 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 71 may be an internal storage unit of the device 7, such as a hard disk or a memory of the device 7. The memory 71 may also be an external storage device of the device 7, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the device 7. Further, the memory 71 may also include both an internal storage unit of the device 7 and an external storage device. The memory 71 is used for storing the computer program and other programs and data required by the terminal device. The memory 71 may also be used to temporarily store data that has been output or is to be output.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
Specifically, the present application further provides a computer-readable storage medium, which may be a computer-readable storage medium contained in the memory in the foregoing embodiments; or it may be a separate computer-readable storage medium not incorporated into the terminal device. The computer readable storage medium stores one or more computer programs:
the computer readable storage medium comprises a computer program stored in the computer readable storage medium, and the computer program is used for realizing the steps of the positive pressure pneumatic ash conveying time setting method when being executed by a processor.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method for setting positive pressure pneumatic ash conveying time is characterized by comprising the following steps:
acquiring a first ash conveying operation cost in the current ash conveying interval time;
detecting real-time material level and real-time temperature of an ash hopper based on the current ash conveying interval time, wherein the real-time temperature is used for judging whether the real-time material level is accurate or not;
adjusting the ash conveying interval time in real time according to the real-time material level and the real-time temperature;
acquiring a second ash conveying operation cost after the ash conveying interval time is adjusted;
and determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjusting the optimal ash conveying interval time.
2. The method of claim 1, wherein determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjusting to the optimal ash conveying interval time, further comprises:
determining the feeding time of each bin pump according to the real-time load of the unit;
controlling the length of the ash conveying process of each bin pump according to the lower limit threshold of the pressure of the ash conveying pipeline;
and determining the ash conveying time of each bin pump according to the feeding time and the ash conveying process time.
3. The method as claimed in claim 1, wherein obtaining the first ash conveying operation cost in the current ash conveying interval time specifically comprises:
acquiring total ash conveying compressed air consumption, total ash bucket heating energy consumption and total ash removal system electricity consumption based on the current ash conveying interval time;
multiplying the total ash conveying compressed air consumption by the unit cost of the compressed air to obtain the total compressed air cost;
multiplying the total heating energy consumption of the ash bucket by the unit price of the energy source to obtain the total heating cost of the ash bucket;
multiplying the total power consumption of the ash removal system by the unit price of the station service power to obtain the total cost of the ash removal power consumption;
and the total cost of the compressed air plus the total cost of the ash hopper heating plus the total cost of the ash removal electricity consumption is added to obtain a first ash conveying operation cost.
4. The method as claimed in claim 1, wherein the real-time adjusting of the ash conveying interval time of the ash hopper according to the real-time material level and the real-time temperature specifically comprises:
judging whether the ash bucket is blocked or not to give an alarm according to the real-time material level and the real-time temperature;
if so, shortening the ash conveying interval time;
if not, prolonging the ash conveying interval time.
5. The method according to claim 1, wherein determining the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost specifically comprises:
comparing the first ash conveying operation cost with the second ash conveying operation cost;
if the first ash conveying operation cost is larger than the second ash conveying operation cost, prolonging the ash conveying interval time, and returning to the step to obtain the first ash conveying operation cost in the current ash conveying interval time;
and if the first ash conveying operation cost is less than the second ash conveying operation cost, determining the ash conveying interval time corresponding to the first ash conveying operation cost as the optimal ash conveying interval time, and adjusting the optimal ash conveying interval time.
6. The method according to claim 2, wherein the feed time period is calculated by the formula:
wherein Mmax is the coal consumption of the unit under full load, and the unit is t/h; l is the unit load under the actual condition, and the unit is MW; tmax is the full load of the unit, T is the feeding duration of the bin pump, and the unit is s.
7. The method according to claim 2, wherein after determining the ash conveying time period of each silo pump according to the feeding time period and the ash conveying process time period, the method further comprises the following steps:
judging whether the ash conveying process is finished or not under the ash conveying duration according to the temperature of the bin pump;
if the temperature of the bin pump meets the preset conditions, the ash conveying process is smoothly finished.
8. A positive pressure pneumatic ash conveying time setting device is characterized by comprising:
the first cost calculation module is configured to obtain a first ash conveying operation cost in the current ash conveying interval time;
the detection module is configured to detect a real-time material level and a real-time temperature of an ash bucket based on the current ash conveying interval time, wherein the real-time temperature is used for judging whether the real-time material level is accurate or not;
the time adjusting module is configured to adjust the ash conveying interval time of the ash hopper in real time according to the real-time material level and the real-time temperature;
a second cost calculation module configured to obtain a second ash conveying operation cost after the ash conveying interval time is adjusted;
and the optimal time determining module is configured to determine the ash conveying interval time corresponding to the minimum ash conveying operation cost as the optimal ash conveying interval time based on the first ash conveying operation cost and the second ash conveying operation cost, and adjust the optimal ash conveying interval time.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A storage medium storing a computer program, characterized in that the computer program realizes the steps of the method according to any one of claims 1 to 7 when executed by a processor.
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