CN109625980B - Pneumatic ash removal system and ash conveying time optimization method - Google Patents
Pneumatic ash removal system and ash conveying time optimization method Download PDFInfo
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- CN109625980B CN109625980B CN201811647718.4A CN201811647718A CN109625980B CN 109625980 B CN109625980 B CN 109625980B CN 201811647718 A CN201811647718 A CN 201811647718A CN 109625980 B CN109625980 B CN 109625980B
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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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Abstract
The invention discloses a pneumatic ash handling system and an ash handling time optimization method, which are suitable for solving the problems of large system power consumption and reduced system safety margin caused by unreasonable interval time setting of each ash handling unit of the pneumatic ash handling system of a coal-fired unit.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of coal-fired power stations, and relates to a pneumatic ash removal system and an ash conveying time optimization method.
[ background of the invention ]
A positive-pressure concentrated-phase pneumatic ash removal system is generally adopted in domestic coal-fired power stations, the system has fewer links, is simple and reliable, but the ash removal system of more power plants has higher power consumption rate, the power consumption rate of the ash removal system reaches over 0.2 percent, individual power plants even reach 0.4 percent, and the advanced level of the power consumption rate of the ash removal system is about 0.1 percent. The pneumatic ash removal system of the coal-fired power plant is generally in an automatic control mode, and the pneumatic ash removal system runs repeatedly according to set parameters, and any bin pump of the ash conveying unit is preferentially conveyed if a high material level alarm is given. According to the ideal situation, when the ash amount of the bin pump reaches the maximum, the ash conveying state is started, the ash gas is higher, the utilization rate of compressed air is high, but the ash amount in the bin pump cannot be effectively measured due to the field condition, so that the interval time of two ash conveying processes of the ash conveying unit can be set only according to the set value and the operation experience of a manufacturer. The interval time refers to the time interval from the end of the last ash conveying of the ash conveying unit to the beginning of the next conveying. At present, coal quality of domestic coal-fired units is unstable, load fluctuation is large, and therefore generally, in order to ensure safe operation of an ash removal system, margin set at intervals of ash conveying units of a pneumatic ash removal system is large, so that the air consumption of the pneumatic ash removal system is large, the safety margin is reduced, and the ash conveying power consumption is large.
In 2014, the national development and transformation commission, the department of environmental protection and the national energy agency jointly transmit a coal power energy saving, emission reduction, upgrading and transformation action plan (2014-2020), which requires that the average power supply coal consumption is lower than 310 g/(kW & h) and the power supply coal consumption of units of 60 ten thousand kilowatts and above is lower than 300 g/(kW & h) after the existing units are transformed in the aspect of energy saving, so that the interval time of each ash conveying unit of the pneumatic ash removal system needs to be intelligently optimized, the power consumption rate of the pneumatic ash removal system is reduced, and the economic efficiency of the units is improved.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provides a pneumatic ash removal system and an ash conveying time optimization method, which can solve the problems of large system power consumption rate and reduced system safety margin caused by unreasonable interval time setting of each ash conveying unit of the pneumatic ash removal system of a coal-fired unit.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a pneumatic ash removal system comprises an air compressor, wherein an outlet of the air compressor is connected with an air storage tank, the air storage tank is connected with a plurality of ash conveying pipelines through a compressed air main pipe, and the plurality of ash conveying pipelines are connected to an ash warehouse after being converged; the compressed air main pipe and each ash conveying pipeline are provided with an electric valve and a pressure transmitter; the electric valve and the pressure transmitter are interacted with an upper computer through a PLC system; and the upper computer optimizes the ash conveying time through unit peak regulation and coal quality change.
The invention further improves the following steps:
the compressed air main pipe is provided with an electric valve and a pressure transmitter, and the control ends of the electric valve and the pressure transmitter are mutually connected with a controller of the PLC system.
The front end of each ash conveying pipeline is provided with an initial end electric valve and an initial end pressure sensor, and the tail end of each ash conveying pipeline is provided with a tail end electric valve and a tail end pressure sensor; the starting end electric valve, the starting end pressure sensor, the tail end electric valve and the tail end pressure sensor are all interacted with a controller of the PLC system.
The PLC system comprises a PLC controller, a power module, an alarm, a display, an electric valve and each sensor are connected to the PLC controller, and the PLC controller is interacted with an upper computer through a communication module.
The power module is also connected with a UPS module.
An ash conveying time optimization method for a pneumatic ash removal system comprises the following steps:
step 1: the ash removal system is subjected to an optimization test under the stable load working condition of the unit, and the dry ash generation amount is calculated by the formula (1):
B'＝G'T'＝F'*A ar '*T'*k 1 (1)
wherein, the unit of B' is kg;
recording the optimal value T' of the cycle time and the corresponding calorific value Q of the coal as fired net,ar ', ash content is A ar ', the coal feed rate is F'; t 'and F' are determined by optimization experiments to determine the value, Q net,ar ' and A ar The coal sample is obtained by sampling and testing during the test process;
step 2: after the calorific value of the coal type changes, assuming that the change of the calorific value of the coal type is caused by the ash content, the ash content after the change of the coal type is calculated by the following formula (2):
wherein beta means ash A ar Receiving a change value of the base low heating value when the change value is 1 percentage point, wherein the unit is MJ/kg, beta is obtained by fitting a plurality of groups of coal quality test data, and the beta is a constant for the determined coal type beta;
and step 3: under the stable load working condition, the heat balance of the boiler is calculated by the following formula (3):
F*Q net,ar *η＝F'*Q net,ar '*η' (3)
wherein F is the fuel supply rate, thereby obtaining the coal type change heating value Q net,ar ；
And 4, step 4: when the coal-fired unit participates in peak shaving, the generation amount of dry ash of the coal-fired unit is calculated by the formula (4):
when the unit peak shaving and the coal quality change, the deviation between the dry ash generation amount B and the dry ash generation amount B' is not more than 5 percent, and the corresponding time T is considered as the optimal cycle time of the ash conveying unit; f is the fuel supply rate and the real-time total coal feeding amount of the coal mill for the coal-fired unit; wherein B is in kg and T is in S.
Compared with the prior art, the invention has the following beneficial effects:
compared with the traditional pneumatic ash handling system operation parameter setting, the pneumatic ash handling system control parameter optimization method provided by the invention can reduce ash conveying frequency, reduce the consumption of compressed air, reduce the system operation energy consumption, improve the system safety margin, reduce the abrasion of pipelines and valves, save energy, reduce the maintenance cost and further improve the system reliability.
[ description of the drawings ]
FIG. 1 is a schematic structural view of a pneumatic ash removal system according to the present invention;
FIG. 2 is an architecture diagram of a PLC system of the present invention;
FIG. 3 is a flow chart of a ash removal time optimization method of the present invention;
FIG. 4 is a schematic diagram of the operating pressure variation curve of a bin pump in the ash conveying unit.
Wherein: 1-an air compressor; 2-a gas storage tank; 3-compressed air main pipe; 4-ash storehouse; 5, electrically operated valve; 6-a pressure transmitter; 7-ash conveying pipeline.
[ detailed description ] A
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and do not limit the scope of the disclosure of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
In the context of the present disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present. In addition, if a layer/element is "on" another layer/element in one orientation, then that layer/element may be "under" the other layer/element when the orientation is reversed.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the pneumatic ash removal system comprises an air compressor 1, wherein an outlet of the air compressor 1 is connected with an air storage tank 2, the air storage tank 2 is connected with a plurality of ash conveying pipelines 7 through a compressed air main pipe 3, and the plurality of ash conveying pipelines are connected to an ash storage 4 after being converged; the compressed air main pipe 3 and each ash conveying pipeline are provided with an electric valve and a pressure transmitter; the electric valve and the pressure transmitter are interacted with an upper computer through a PLC system; and the upper computer optimizes the ash conveying time through unit peak regulation and coal quality change. The compressed air main pipe 3 is provided with an electric valve 5 and a pressure transmitter 6, and the control ends of the electric valve 5 and the pressure transmitter are mutually connected with a controller of the PLC system. The front end of each ash conveying pipeline is provided with an initial end electric valve and an initial end pressure sensor, and the tail end of each ash conveying pipeline is provided with a tail end electric valve and a tail end pressure sensor; the starting end electric valve, the starting end pressure sensor, the tail end electric valve and the tail end pressure sensor are all interacted with a controller of the PLC system.
As shown in fig. 2, the PLC system includes a PLC controller, and the PLC controller is connected with a power module, an alarm, a display, an electric valve, and sensors, and is interactive with an upper computer through a communication module. The power module is also connected with a UPS module.
As shown in fig. 3, the invention also discloses an ash conveying time optimization method for the pneumatic ash removal system, which comprises the following steps:
step 1: the ash removal system is subjected to an optimization test under the stable load working condition of the unit, and the dry ash generation amount is calculated by the formula (1):
B'＝G'T'＝F'*A ar '*T'*k 1 (1)
wherein, the unit of B' is kg;
recording the optimal value T' of the cycle time and the corresponding calorific value Q of the coal as fired net,ar ', ash content is A ar '、The coal feed rate is F'; t 'and F' are determined by optimization experiments to determine the value, Q net,ar ' and A ar The coal sample is obtained by sampling and testing during the test process;
step 2: after the calorific value of the coal type is changed, assuming that the change of the calorific value of the coal type is caused by the ash content, the ash content after the change of the coal type is calculated by the following formula (2):
wherein beta means ash A ar When the heat value changes by 1 percentage point, the change value of the base low heating value is received, the unit is MJ/kg, beta is obtained by fitting test data of a plurality of groups of coal quality, and the beta is a constant for the determined coal type beta;
and 3, step 3: under the stable load working condition, the heat balance of the boiler is calculated by the following formula (3):
F*Q net,ar *η＝F'*Q net,ar '*η' (3)
wherein F is the fuel supply rate, thereby obtaining the heat value Q after the coal type change net,ar ；
And 4, step 4: when the coal-fired unit participates in peak shaving, the generation amount of dry ash of the coal-fired unit is calculated by the formula (4):
when the unit peak shaving and the coal quality change, the deviation between the dry ash generation amount B and the dry ash generation amount B' is not more than 5 percent, and the corresponding time T is considered as the optimal cycle time of the ash conveying unit; f is the fuel supply rate and the real-time total coal feeding amount of the coal mill for the coal-fired unit; wherein B is in kg and T is in S.
The principle of the invention is as follows:
carrying out optimization test on the ash removal system under the unit stable load working condition, wherein the heat value of the coal as fired is Q during the test net,ar ', ash content is A ar ', coal supply rate F', and optimum cycle time T'to obtain B' in the dry ash production amount as the maximum conveying amount value of single ash conveying of the ash conveying pipeline. The real-time calculation of the optimal cycle time interval T is realized by a computer and is fed back to a PLC control program or an upper computer is added to control the operation of the ash removal system. When the unit peak regulation and the coal quality change, the optimal value T of the circulation time of the ash conveying unit is changed in real time, and the dry ash amount conveyed by the ash conveying unit for one time is a full bin pump or a nearly full bin pump. For a certain ash conveying unit, the conveying time t is different at different ash conveying frequencies when the unit is subjected to peak load regulation and coal quality changes 2 Substantially corresponding to the bin pump operating pressure P.
The specific working process of the invention is as follows:
carrying out optimization test on the ash removal system under the working condition of unit stable load, wherein the heat value of the coal as fired corresponding to the experimental period is Q net,ar ', ash content is A ar 'the coal supply rate is F' and the optimal value of the cycle time T 'so as to obtain B' in the dry ash generation amount as the maximum ash conveying amount of the single ash conveying of the ash conveying pipeline, and the optimal cycle time interval of the pneumatic ash removing system is calculated in real time on a computer server or an upper computer according to the calculation method of the cycle time of the pneumatic ash removing system of the coal-fired unit shown in the figure 1 when the peak shaving of the unit and the coal quality change, so that the utilization efficiency of compressed air is improved, the consumption of the compressed air is reduced, and the operation energy consumption of the pneumatic ash removing system is reduced. The method has strong operability.
The above contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention should not be limited thereby, and any modification made on the basis of the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.
Claims (1)
1. A method for optimizing ash conveying time is based on a pneumatic ash removal system, and comprises an air compressor (1), wherein an outlet of the air compressor (1) is connected with an air storage tank (2), the air storage tank (2) is connected with a plurality of ash conveying pipelines (7) through a compressed air main pipe (3), and the plurality of ash conveying pipelines are connected to an ash warehouse (4) after being converged; the compressed air main pipe (3) and each ash conveying pipeline are provided with an electric valve and a pressure transmitter; the electric valve and the pressure transmitter are interacted with an upper computer through a PLC system; the upper computer optimizes the ash conveying time through unit peak regulation and coal quality change; an electric valve (5) and a pressure transmitter (6) are arranged on the compressed air main pipe (3), and the control ends of the electric valve and the pressure transmitter are mutually interacted with a controller of the PLC system; the front end of each ash conveying pipeline is provided with an initial end electric valve and an initial end pressure sensor, and the tail end of each ash conveying pipeline is provided with a tail end electric valve and a tail end pressure sensor; the starting end electric valve, the starting end pressure sensor, the tail end electric valve and the tail end pressure sensor are all interacted with a controller of the PLC system; the PLC system comprises a PLC controller, a power module, an alarm, a display, an electric valve and various sensors are connected to the PLC controller, and the PLC controller is interacted with an upper computer through a communication module; the power supply module is also connected with a UPS module; characterized in that the method comprises the following steps:
step 1: the ash removal system is subjected to an optimization test under the stable load working condition of the unit, and the dry ash generation amount is calculated by the formula (1):
B'＝G'T'＝F'*A ar '*T'*k 1 (1)
wherein, the unit of B' is kg;
recording the optimal value T' of the cycle time and the corresponding calorific value Q of the coal as fired net,ar ', ash content is A ar ', the coal feed rate is F'; t 'and F' are determined by optimization experiments to determine the value, Q net,ar ' and A ar The' is obtained by sampling and testing the test coal in the test process;
step 2: after the calorific value of the coal type changes, assuming that the change of the calorific value of the coal type is caused by the ash content, the ash content after the change of the coal type is calculated by the following formula (2):
wherein beta means ash A ar Receiving a change value of the base low heating value when the change value is 1 percentage point, wherein the unit is MJ/kg, beta is obtained by fitting a plurality of groups of coal quality test data, and the beta is a constant for the determined coal type beta;
and step 3: under the stable load working condition, the heat balance of the boiler is calculated by the following formula (3):
F*Q net,ar *η＝F'*Q net,ar '*η' (3)
wherein F is the fuel supply rate, thereby obtaining the coal type change heating value Q net,ar ；
And 4, step 4: when the coal-fired unit participates in peak shaving, the generation amount of dry ash of the coal-fired unit is calculated by the formula (4):
when the peak regulation of the unit and the coal quality change, the deviation between the dry ash generation amount B and the dry ash generation amount B' is not more than 5 percent, and the corresponding time T is considered as the optimal cycle time of the ash conveying unit; f is the fuel supply rate, and for the coal-fired unit, the total coal supply quantity of the coal mill is real-time; wherein B is in kg and T is in S.
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| CN111596632B (en) * | 2020-06-09 | 2022-02-22 | 汤传金 | Coal fired power plant ash conveying control optimization system |
| CN113042213B (en) * | 2021-03-09 | 2024-01-30 | 浙江菲达环保科技股份有限公司 | Cooperative control method and system for electric dust removal system and ash conveying system |
| CN114063581B (en) * | 2021-11-16 | 2024-01-23 | 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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