CN109625980A - A kind of pneumatic ash removal system and the defeated time-optimized method of ash - Google Patents
A kind of pneumatic ash removal system and the defeated time-optimized method of ash Download PDFInfo
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- CN109625980A CN109625980A CN201811647718.4A CN201811647718A CN109625980A CN 109625980 A CN109625980 A CN 109625980A CN 201811647718 A CN201811647718 A CN 201811647718A CN 109625980 A CN109625980 A CN 109625980A
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- ash
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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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- Mechanical Engineering (AREA)
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- Gasification And Melting Of Waste (AREA)
Abstract
The invention discloses a kind of pneumatic ash removal system and the defeated time-optimized methods of ash, interval time setting suitable for solving the problems, such as each defeated grey unit of coal unit pneumatic ash removal system is unreasonable to cause system consumption rate bigger than normal and system safety allowance reduces, it is adjusted according to the how many pairs of defeated grey frequencys of dry ash production quantity, compressed air consumption can be reduced, reduction system operation energy consumption, raising system safety allowance, reduce pipeline, valve wear, reach energy conservation, reduce repair and maintenance expense, and then improve system reliability, and intelligent optimization method operability proposed by the present invention is extremely strong.
Description
[technical field]
The invention belongs to coal fired power plant technical fields, are related to a kind of pneumatic ash removal system and the defeated time-optimized method of ash.
[background technique]
Domestic coal fired power plant generallys use positive pressure dense Phase Pneumatic Ash Handling system, and the system link is less, simple and reliable, but compared with
More power plant's ash disposal system consumption rates are higher, and ash disposal system consumption rate reaches 0.2% or more, and individual power plants are even up to 0.4%, and
The advanced level of ash disposal system consumption rate is 0.1% or so.Coal fired power plant pneumatic ash removal system is generally automation control mould
Formula, according to the operation of set setting parameter in cycles, alarming if any high charge level for any storehouse pump of defeated ash unit is then preferential
Conveying.According to ideal situation, when storehouse, pump ash quantity reaches maximum, into defeated grey state, grey gas is relatively high at this time, compressed air benefit
It is high with rate, but it is limited to field condition, the ash quantity in the pump of storehouse can not effectively be measured, therefore can only be according to producer's given value
The interval time of defeated grey unit grey process defeated twice is set with operating experience.Interval time refers to the last defeated ash knot of defeated grey unit
Time interval when starting is conveyed to next round when beam.Current country's coal unit coal quality is unstable, and load fluctuation is larger, because
This is usually to guarantee ash disposal system safe operation, the interval time of each defeated grey unit of pneumatic ash removal system be usually arranged allowance compared with
Greatly, so that pneumatic ash removal system air consumption is bigger than normal, safety allowance is reduced, and defeated ash consumption rate is bigger than normal.
National Development and Reform Committee in 2014, Chinese Ministry of Environmental Protection and National Energy Board, which combine, prints and distributes " coal electricity energy-saving and emission-reduction upgrading and transformation row
Move plan (2014~the year two thousand twenty) " require average net coal consumption rate after active service Transformation of Unit to be lower than 310g/ (kW in terms of energy conservation
H), 600,000 kilowatts and the above unit net coal consumption rate are lower than 300g/ (kWh), it is therefore necessary to defeated ash each to pneumatic ash removal system
The interval time of unit carries out intelligent optimization, reduces pneumatic ash removal system consumption rate, and the economy for improving unit is advantageous
's.
[summary of the invention]
It is an object of the invention to overcome the above-mentioned prior art, a kind of pneumatic ash removal system and defeated grey time are provided
Optimization method, the interval time setting for being able to solve each defeated grey unit of coal unit pneumatic ash removal system unreasonable cause system to consume
The problem of electric rate is bigger than normal and system safety allowance reduces.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
The outlet of a kind of pneumatic ash removal system, including air compressor machine, air compressor machine connects air accumulator, and air accumulator passes through compressed air
Main pipe connects several ash handing pipelines, and several ash handing pipelines are connected to grey library after converging；In compressed air main pipe and each ash handing pipeline
It is provided with motor-driven valve and pressure transmitter；Motor-driven valve and pressure transmitter pass through PLC system and interact with host computer；It is upper
Machine optimizes the defeated grey time by peak load regulation and coal varitation.
A further improvement of the present invention lies in that:
Motor-driven valve and pressure transmitter be set in compressed air main pipe, the control terminal of the two with the controller of PLC system
It interacts.
The front end setting of every ash handing pipeline is respectively provided with starting point electrically operated valve and starting point pressure sensor, and end is all provided with
Set terminal electrically operated valve and terminal pressure sensor；Starting point electrically operated valve, starting point pressure sensor, end electrically operated valve and
Terminal pressure sensor interacts with the controller of PLC system.
PLC system includes PLC controller, and power module, alarm, display, electrically operated valve are connected in PLC controller
And each sensor, and interacted by communication module and host computer.
UPS module is also connected on power module.
A kind of defeated time-optimized method of ash for pneumatic ash removal system, comprising the following steps:
Step 1: test optimized to ash disposal system in set steady load condition, dry ash production quantity by formula (1) into
Row calculates:
B'=G'T'=F'*Aar'*T'*k1 (1)
Wherein, B' unit is kg；
It records circulation time optimum value T' and its corresponding as-fired coal calorific value is Qnet,ar', ash content Aar', coal-fired supply speed
Rate is F'；T' and F' determines numerical values recited, Q by Optimum Experimentnet,ar' and Aar' it is test coal sample examination during test
It obtains；
Step 2: after coal calorific value changes, it is assumed that the variation of coal calorific value is all the then coal as caused by ash content
Ash content is calculated by formula (2) after variation:
Wherein, β meaning is ash content AarThe changing value of net calorific value as received basis, unit MJ/ at 1 percentage point of every variation
Kg, β are fitted to obtain by the analysis data of multiple groups coal quality, are constant for determining coal β；
Step 3: under steady load operating condition, boiler heat balance is calculated by formula (3):
F*Qnet,ar* η=F'*Qnet,ar'*η' (3)
Wherein, F is fuel delivery rate, thus obtains calorific value Q after coal type changenet,ar；
Step 4: when coal unit participates in peak regulation, being counted in the production quantity of time T Internal-combustion engine using coal group dry ash by formula (4)
It calculates:
In peak load regulation and coal varitation, when dry ash production quantity B and B' deviation thinks corresponding at this time when being no more than 5%
Between T be the defeated grey unit optimum cycle time；F is fuel delivery rate, always gives coal in real time for coal unit for coal pulverizer
Amount；Wherein B unit is kg, T unit S.
Compared with prior art, the invention has the following advantages:
The present invention is compared with traditional pneumatic ash removal system operating parameter is arranged, pneumatic ash removal system control proposed by the present invention
Parameter optimization method can reduce the defeated grey frequency, reduce compressed air consumption, reduce system operation energy consumption, improve system safety
Allowance reduces pipeline, valve wear, reaches energy conservation, reduces repair and maintenance expense, and then improves system reliability.
[Detailed description of the invention]
Fig. 1 is the structural schematic diagram of pneumatic ash removal system of the invention；
Fig. 2 is the architecture diagram of PLC system of the invention；
Fig. 3 is the flow chart of the time-optimized method of ash disposal of the invention；
Fig. 4 is storehouse pump operation pressure history schematic diagram in defeated grey unit.
Wherein: 1- air compressor machine；2- air accumulator；3- compressed air main pipe；4- ash library；5- motor-driven valve；6- pressure transmitter；7-
Ash handing pipeline.
[specific embodiment]
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, the embodiment being not all of, and it is not intended to limit range disclosed by the invention.In addition, with
In lower explanation, descriptions of well-known structures and technologies are omitted, obscures concept disclosed by the invention to avoid unnecessary.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment should fall within the scope of the present invention.
The various structural schematic diagrams for disclosing embodiment according to the present invention are shown in the attached drawings.These figures are not in proportion
It draws, wherein some details are magnified for the purpose of clear expression, and some details may be omitted.As shown in the figure
The shape in various regions, layer and relative size, the positional relationship between them out is merely exemplary, in practice may be due to
Manufacturing tolerance or technical restriction and be deviated, and those skilled in the art may be additionally designed as required have not
Similar shape, size, the regions/layers of relative position.
In context disclosed by the invention, when one layer/element is referred to as located at another layer/element "upper", the layer/element
Can may exist intermediate layer/element on another layer/element or between them.In addition, if in a kind of court
One layer/element is located at another layer/element "upper" in, then when turn towards when, the layer/element can be located at another layer/
Element "lower".
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
The invention will be described in further detail with reference to the accompanying drawing:
Referring to Fig. 1, pneumatic ash removal system of the present invention, including air compressor machine 1, the outlet of air compressor machine 1 connect air accumulator 2, gas storage
Tank 2 connects several ash handing pipelines 7 by compressed air main pipe 3, and several ash handing pipelines are connected to grey library 4 after converging；Compressed air
Motor-driven valve and pressure transmitter are provided on main pipe 3 and each ash handing pipeline；Motor-driven valve and pressure transmitter pass through PLC system
It interacts with host computer；Host computer optimizes the defeated grey time by peak load regulation and coal varitation.Compressed air main pipe 3
Upper setting motor-driven valve 5 and pressure transmitter 6, the control terminal of the two interact with the controller of PLC system.Every ash handing pipeline
Front end setting be respectively provided with starting point electrically operated valve and starting point pressure sensor, end is all provided with set terminal electrically operated valve and end
Pressure sensor；Starting point electrically operated valve, starting point pressure sensor, end electrically operated valve and terminal pressure sensor with
The controller of PLC system interacts.
As shown in Fig. 2, PLC system includes PLC controller, power module, alarm, display are connected in PLC controller
Device, electrically operated valve and each sensor, and interacted by communication module and host computer.It is also connected on power module
UPS module.
As shown in figure 3, the invention also discloses a kind of defeated time-optimized method of ash for above-mentioned pneumatic ash removal system, packet
Include following steps:
Step 1: test optimized to ash disposal system in set steady load condition, dry ash production quantity by formula (1) into
Row calculates:
B'=G'T'=F'*Aar'*T'*k1 (1)
Wherein, B' unit is kg；
It records circulation time optimum value T' and its corresponding as-fired coal calorific value is Qnet,ar', ash content Aar', coal-fired supply speed
Rate is F'；T' and F' determines numerical values recited, Q by Optimum Experimentnet,ar' and Aar' it is test coal sample examination during test
It obtains；
Step 2: after coal calorific value changes, it is assumed that the variation of coal calorific value is all the then coal as caused by ash content
Ash content is calculated by formula (2) after variation:
Wherein, β meaning is ash content AarThe changing value of net calorific value as received basis, unit MJ/ at 1 percentage point of every variation
Kg, β are fitted to obtain by the analysis data of multiple groups coal quality, are constant for determining coal β；
Step 3: under steady load operating condition, boiler heat balance is calculated by formula (3):
F*Qnet,ar* η=F'*Qnet,ar'*η' (3)
Wherein, F is fuel delivery rate, thus obtains calorific value Q after coal type changenet,ar；
Step 4: when coal unit participates in peak regulation, being counted in the production quantity of time T Internal-combustion engine using coal group dry ash by formula (4)
It calculates:
In peak load regulation and coal varitation, when dry ash production quantity B and B' deviation thinks corresponding at this time when being no more than 5%
Between T be the defeated grey unit optimum cycle time；F is fuel delivery rate, always gives coal in real time for coal unit for coal pulverizer
Amount；Wherein B unit is kg, T unit S.
The principle of the present invention is as follows:
Test is optimized to ash disposal system in set steady load condition, according to as-fired coal calorific value corresponding during test
For Qnet,ar', ash content Aar', coal-fired delivery rate be F' and circulation time optimum value T', to obtain in dry ash production quantity
B', the maximum delivery numerical quantity as the defeated ash of ash handing pipeline single.The real-time calculating of optimum cycle time interval T is to pass through calculating
What machine was realized, and feed back to PLC control program or the operation by increasing PC control ash disposal system.In peak load regulation and
When coal varitation, it is real-time change that defeated ash unit circulation time optimum value, which is T, and the dry ash amount of defeated ash unit single conveying is full
Storehouse pump or pump of closely buying securities with all one's capital.Conveying for determining defeated grey unit, in peak load regulation and coal varitation, when the different defeated grey frequencys
Time t2It is almost the same with storehouse pump operation pressure P.
Specific work process of the invention are as follows:
Test is optimized to ash disposal system in set steady load condition, according to as-fired coal calorific value corresponding during experiment
For Qnet,ar', ash content Aar', coal-fired delivery rate be F' and circulation time optimum value T', to obtain in dry ash production quantity
B', as the maximum delivery of the defeated ash of ash handing pipeline single, according to fire coal shown in FIG. 1 on computer server or host computer
Unit pneumatic ash removal system circulation time calculation method most preferably following to pneumatic ash removal system in peak load regulation and coal varitation
The real-time calculating of ring time interval reduces compressed air consumption to improve the utilization efficiency of compressed air, reduces strength and removes
Ash system operation energy consumption.This method operability is extremely strong.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (6)
1. a kind of pneumatic ash removal system, which is characterized in that including air compressor machine (1), the outlet of air compressor machine (1) connects air accumulator (2),
Air accumulator (2) connects several ash handing pipelines (7) by compressed air main pipe (3), and several ash handing pipelines are connected to grey library after converging
(4)；Motor-driven valve and pressure transmitter are provided on compressed air main pipe (3) and each ash handing pipeline；Motor-driven valve and pressure inverting
Device passes through PLC system and interacts with host computer；Host computer carries out the defeated grey time excellent by peak load regulation and coal varitation
Change.
2. pneumatic ash removal system according to claim 1, which is characterized in that motor-driven valve is arranged on (3) in compressed air main pipe
(5) it interacts with the controller of PLC system with pressure transmitter (6), the control terminal of the two.
3. pneumatic ash removal system according to claim 1, which is characterized in that the front end setting of every ash handing pipeline is respectively provided with
Starting point electrically operated valve and starting point pressure sensor, end are all provided with set terminal electrically operated valve and terminal pressure sensor；Starting
Hold electrically operated valve, starting point pressure sensor, end electrically operated valve and terminal pressure sensor with the controller phase of PLC system
Interaction.
4. pneumatic ash removal system according to claim 1 or 2 or 3, which is characterized in that PLC system includes PLC controller,
It is connected with power module, alarm, display, electrically operated valve and each sensor in PLC controller, and passes through communication mould
Block interacts with host computer.
5. pneumatic ash removal system according to claim 4, which is characterized in that be also connected with UPS module on power module.
6. a kind of defeated time-optimized method of ash for pneumatic ash removal system described in claim 1-5, which is characterized in that including with
Lower step:
Step 1: test being optimized to ash disposal system in set steady load condition, dry ash production quantity is counted by formula (1)
It calculates:
B'=G'T'=F'*Aar'*T'*k1 (1)
Wherein, B' unit is kg；
It records circulation time optimum value T' and its corresponding as-fired coal calorific value is Qnet,ar', ash content Aar', coal-fired delivery rate be
F'；T' and F' determines numerical values recited, Q by Optimum Experimentnet,ar' and Aar' obtained for test coal sample examination during test
It arrives；
Step 2: after coal calorific value changes, it is assumed that the variation of coal calorific value is all the then coal type change as caused by ash content
Ash content is calculated by formula (2) afterwards:
Wherein, β meaning is ash content AarThe changing value of net calorific value as received basis, unit MJ/kg, β at 1 percentage point of every variation
It is fitted to obtain by the analysis data of multiple groups coal quality, is constant for determining coal β；
Step 3: under steady load operating condition, boiler heat balance is calculated by formula (3):
F*Qnet,ar* η=F'*Qnet,ar'*η' (3)
Wherein, F is fuel delivery rate, thus obtains calorific value Q after coal type changenet,ar；
Step 4: when coal unit participates in peak regulation, calculated in the production quantity of time T Internal-combustion engine using coal group dry ash by formula (4):
In peak load regulation and coal varitation, dry ash production quantity B and B' deviation thinks T of corresponding time at this time when being no more than 5%
For the defeated grey unit optimum cycle time；F is fuel delivery rate, is coal pulverizer total coal-supplying amount in real time for coal unit；
Wherein B unit is kg, T unit S.
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Cited By (3)
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| CN111596632A (en) * | 2020-06-09 | 2020-08-28 | 汤传金 | Coal fired power plant ash conveying control optimization system |
| CN113042213A (en) * | 2021-03-09 | 2021-06-29 | 浙江菲达环保科技股份有限公司 | Collaborative control method and system for electric dust removal system and ash conveying system |
| CN114063581A (en) * | 2021-11-16 | 2022-02-18 | 西安热工研究院有限公司 | Intelligent adaptive ash conveying control system for coal-fired power plant |
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| CN109625980B (en) | 2023-03-14 |
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