CN110823620A - Coal as fired sampling and coal quality analysis system - Google Patents
Coal as fired sampling and coal quality analysis system Download PDFInfo
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- 238000005070 sampling Methods 0.000 title claims abstract description 162
- 239000003245 coal Substances 0.000 title claims abstract description 155
- 238000004458 analytical method Methods 0.000 title claims abstract description 35
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
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- G—PHYSICS
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- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/52—Weighing apparatus combined with other objects, e.g. furniture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
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- G—PHYSICS
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Abstract
The invention relates to a coal as fired sampling and coal quality analysis system, comprising: the sampler equipment is used for sampling the coal as fired; the communication equipment is connected with the sampler equipment; the upper computer is connected with the sampler equipment through communication equipment and comprises a sampler control optimization module, a report analysis module, a voice alarm module and a field real-time data display module. Compared with the prior art, the coal flow monitoring system has the advantages of solving the problems that the coal flow is variable and the field production cannot be effectively monitored in the coal sampling process and the like.
Description
Technical Field
The invention relates to a coal as fired detection technology, in particular to a coal as fired sampling and coal quality analysis system.
Background
Due to the characteristics of energy structures in China, coal-fired power plants occupy the main position of power systems. Coal quality is variable in the power production process, accuracy and scientificity of sampling and analyzing as-fired coal directly influence accounting of fuel cost, adjustment of power plant operation parameters, calculation and analysis of main economic indexes and the like, and the method has important significance for operation decision of a thermal power plant.
Most of the existing coal sampling machines are arranged in the middle of a conveying belt, a full-section sampling mode is adopted, and the whole set of equipment consists of three parts, namely a sampling system, a sample preparation system and a residual material return system. The sampling head samples coal samples according to sampling intervals, the splitter separates the samples according to the splitting intervals, and the sampling intervals and the splitting intervals are manually set on the touch screen on site. The coal as fired sampling machine usually operates in an automatic control mode, is started along with a belt after being put into interlocking and automatically operates according to set fixed parameters. However, due to the fact that coal feeding flow is variable, automatic operation parameters of sampling machine equipment cannot be self-adaptive, and the like, when coal sources are more, sampling amount does not have representativeness, and therefore the difference between a heat value obtained through testing and a true value is large; when a single coal type is sampled, the sample amount changes along with the coal feeding amount, and the sample receiving amount is difficult to reach the national standard requirement of 20kg, so that the coal sample analysis is ineffective. In addition, important data such as the amount of coal and the amount of collected samples in the sampling process are not recorded, and data support cannot be provided for subsequent analysis and diagnosis.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a coal as fired sampling and coal quality analysis system.
The purpose of the invention can be realized by the following technical scheme:
a coal as fired sampling and coal quality analysis system comprises:
the sampler equipment is used for sampling the coal as fired;
the communication equipment is connected with the sampler equipment;
the upper computer is connected with the sampler equipment through communication equipment and comprises a sampler control optimization module, a report analysis module, a voice alarm module and a field real-time data display module.
Preferably, the sampler device comprises a sample sampling barrel, and a weighing device is mounted on the sample sampling barrel and used for accurately measuring the weight of the sample.
Preferably, the weighing device comprises a weighing sensor and a weighing instrument which are connected with each other.
Preferably, the communication device comprises a network switch and a communication optical fiber, and is used for establishing data transmission between the upper computer and the sampling machine device.
Preferably, the sampler control optimization module includes:
the multi-coal sampling time optimization unit is used for optimizing the sampling time during sampling of multiple coal types according to the matching relation between the coal flow and the sampling amount;
and the single coal type sampling interval optimization unit is used for optimizing the sampling interval according to the quality requirement of the sample size required to be met during single coal type sampling.
Preferably, the specific working process of the multiple coal sampling time optimization unit is as follows:
when the flow is larger than 900t/h, the sampling interval is automatically adjusted to 200 seconds;
the flow is more than 800 and less than or equal to 900t/h, and the sampling interval is automatically adjusted to 180 seconds;
the flow is more than 600 and less than or equal to 800t/h, and the sampling interval is automatically adjusted to 160 seconds;
the flow is more than 400 and less than or equal to 700t/h, and the sampling interval is automatically adjusted to 140 seconds;
the flow is less than or equal to 400t/h, and the sampling interval is automatically adjusted to 120 seconds.
Preferably, the sampling interval of the single coal type sampling interval optimization unit is automatically adjusted to coal feeding amount/20.
Preferably, the report analysis module includes:
the sampling head action report unit comprises sampling date, time, flow, sample weight and sampling position information and is used for mastering the working condition of equipment and analyzing and judging the performance and faults of the sampling machine;
the report unit of the coal feeding amount and the sampling amount of the multiple coal types comprises information of the number of shifts, the coal types, the coal feeding amount, the starting time, the ending time and the sampling amount, and is used for mastering the coal feeding amount and the sampling amount condition of each shift;
and the heat value deviation analysis report unit comprises the shift, the coal type, the heat value of the corresponding coal type, the coal feeding amount of each shift, the sample amount of each shift, the set coal feeding amount, the total weight of the sample amount, the actual average heat value and the calculation information of the heat value after sampling.
Preferably, the heat value difference of the heat value deviation analysis report unit is specifically analyzed as follows:
setting the coal feeding amount as T, the corresponding heat value as J, the sample amount as y, the number of coal types as n and a certain coal type as i;
ideal weight of a certain coal: qi ═ Ti/(t1+ t2+ t3+. + tn) × 100%;
sample weight after sampling: qi ═ Yi/(y1+ y2+ y3+. + yn) × 100%;
actual average heat value calculation:
j-flat (T1 × J1+ T2 × J2+ T3 × J3+. + Tn × Jn)/(T1+ T2+ T3+. + Tn);
sample size heat value after sampling:
j is J (Q1-Q1) × J1- (Q2-Q2) × J2- (Q3-Q3) × J3- } - (Qn-Qn) × Jn.
Preferably, the voice alarm module comprises a sample volume full tank reminding unit and an equipment fault alarm unit, and the field real-time data display module is used for displaying information of each equipment state, start-stop operation, sampling control parameters, belt flow, coal type and sampling barrel weight of the sampling machine;
the upper computer is internally provided with a remote control interface, and the sampler control optimization module, the report analysis module, the voice alarm module and the field real-time data display module are integrated on the remote control interface.
Compared with the prior art, the invention provides a coal as fired sampling and performance analysis system, which is used for solving the problems that the coal flow is variable and the field production cannot be effectively monitored in the coal sampling process; the remote control and voice prompt functions are realized by establishing communication with field equipment; the optimization of the sampling time of multiple coal types and the sampling interval of a single coal type can effectively overcome the problem caused by variable coal flow; meanwhile, the functions of diagnosis, analysis and report can be further realized by utilizing the acquired data, so that the field process is effectively monitored, and the economic benefit of the power plant operation is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a remote control interface according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The invention provides a coal as fired sampling and coal quality analysis system, which is used for solving the problems that the coal flow is variable and the field production cannot be effectively monitored in the coal sampling process. The remote control and voice prompt functions are realized by establishing communication with field equipment; the optimization of the sampling time of multiple coal types and the sampling interval of a single coal type can effectively overcome the problem caused by variable coal flow; meanwhile, the functions of diagnosis, analysis and report can be further realized by utilizing the acquired data, so that the field process is effectively monitored, and the economic benefit of the power plant operation is improved.
The schematic diagram of the structural principle of the system of the invention is shown in fig. 1, and the specific functions are as follows:
1) the method comprises the steps of modifying and upgrading field equipment, installing a sensing instrument, matching with related network communication equipment, and correspondingly optimizing and designing hardware and software.
A weighing device is arranged on the sample collecting barrel and comprises a weighing sensor and a weighing instrument, and the weighing sensor and the weighing instrument are used for accurately measuring the weight of the sample; upgrading PLC hardware and internal programs controlled by the on-site sampler to meet the requirement of optimization of the sampler control; the equipment such as a matched switch, a communication optical fiber and the like establishes data transmission with the field equipment.
One industrial personal computer is additionally arranged in the coal conveying program control chamber, and the real-time working condition information of the sampling machine can be displayed on the industrial personal computer; the sampling interval and the division interval can also be set on the computer operation interface (all functions on the original touch screen are completely reserved); the sampling interval can be changed in real time on a computer operation interface according to the weight information of the samples collected on site through the real-time communication between the optical fiber communication computer and the site weighing instrument and the PLC; the report function with comprehensive functions can record the sampling working condition information, the selection information of the sampling scheme, the sampling interval, the division interval and the sample weight information under the sampling scheme on the report generated by the computer; operation information of the device, etc.;
one Ethernet switch is installed in the field control cabinet, and a communication interface is reserved for other equipment to be accessed into the control system.
And replacing a Siemens S7200 Smart PLC which is provided with two communication ports of an Ethernet and a serial port at the same time. Thus, the requirements of field working conditions can be met.
2) Optimizing the control function of the sampler, optimizing the sampling time during sampling of multiple coal types according to the matching relationship between the coal flow and the sampling amount (on the premise that sampling parameters are not changed, the sample amount and the flow are in a nonlinear relationship, the flow is larger, the sample amount is larger, the flow is less than 300 tons/hour, the sample amount is almost not present, and the sample amount and the flow are in a parabolic relationship), and compensating the influence caused by the change of the coal flow; meanwhile, the sampling interval is optimized according to the quality requirement of the sample size required to be met during sampling of a single coal type.
a) Multiple coal sampling time optimization
The sampling time of sampling of various coals is optimized, when the flow is larger than 900t/h, the sampling interval is automatically adjusted to 200 seconds, the flow is larger than 800 and smaller than or equal to 900t/h, the sampling interval is automatically adjusted to 180 seconds, the flow is larger than 600 and smaller than or equal to 800t/h, the sampling interval is automatically adjusted to 160 seconds, the flow is larger than 400 and smaller than or equal to 700t/h, the sampling interval is automatically adjusted to 140 seconds, the flow is smaller than or equal to 400t/h, and the sampling interval is automatically adjusted to 120 seconds.
b) Single coal sampling interval optimization
In order to compare the heat value of a single coal entering a furnace with the heat value of a single coal entering a plant, the sampling amount is usually 600-1000 tons to meet the requirement of 20Kg, the single coal is selected, the predicted coal feeding amount is input, the sampling is carried out by mass level, namely, the preset sampling interval is that the predicted coal feeding amount is/20, the corresponding relation between the calculated coal feeding amount and the sample amount is calculated by 20%, 40%, 60% and 80% of the coal feeding amount, and the mass level interval is adjusted to be 20 tons at the minimum and 50 tons at the maximum.
3) And designing report functions including sampling head action conditions, coal sample quantity data statistics, heat value deviation analysis and the like, and providing data for equipment performance diagnosis and coal quality analysis.
a) Sampling head action report
The performance and fault judgment of the sampling machine can be conveniently judged by analyzing the working condition of the equipment through the sampling head action condition report, and the report information comprises sampling date, time, flow, sample weight, sampling position and the like, such as: under the condition of a certain flow, the sampling head acts for 3 times, and if no sample is received, the sampling machine may be blocked in the process flow, and needs on-site inspection, so that objective basis is provided for operators. The detailed report forms are shown in Table 1
TABLE 1
b) Report form of coal feeding quantity and sampling quantity of multiple coal types
The report of the coal feeding amount and the sampling amount of the multiple coal types can conveniently know the coal feeding amount and the sampling amount condition of each shift, and the report information comprises the shift, the coal type, the coal feeding amount, the starting time, the ending time, the sampling amount and the like.
The coal feeding amount and the sampling amount are counted when each shift is operated, the coal feeding amount is usually calculated according to the accumulated difference of the recorded coal amount at that time, the total sampling amount can be collected only when each shift is reported, and errors caused by human factors are difficult to avoid. The generated data report is clear and accurate, and the working pressure of operators is reduced. The specific table is shown in table 2.
TABLE 2
c) Heat value deviation analysis report
Due to the performance of the sampling machine, the coal flow change and other factors, the coal feeding amount of each coal type cannot correspond to the sample amount in equal proportion, but the correction can be carried out through the weight ratio of each coal type. The coal feeding amount and the coal type dividing heat value are known, and the sampling heat value can be deduced by correcting the coal feeding amount of the coal type dividing and the sample amount weight of the coal type dividing, and the specific method comprises the following steps:
setting the coal feeding amount as T, the corresponding heat value as J, the sample amount as y, the number of coal types as n and a certain coal type as i;
ideal weight of a certain coal: qi ═ Ti/(t1+ t2+ t3+. + tn) × 100%;
sample weight after sampling: qi ═ Yi/(y1+ y2+ y3+. + yn) × 100%;
actual average heat value calculation:
j-flat (T1 × J1+ T2 × J2+ T3 × J3+. + Tn × Jn)/(T1+ T2+ T3+. + Tn);
sample size heat value after sampling:
j is J (Q1-Q1) × J1- (Q2-Q2) × J2- (Q3-Q3) × J3- } - (Qn-Qn) × Jn.
According to the parameters, a heat value analysis report can be formed, and the report information comprises the shift, the coal type, the heat value of the corresponding coal type, the coal feeding amount of each shift, the sample amount of each shift, the set coal feeding amount, the total weight of the sample amount, the actual average heat value and the calculation of the heat value after sampling. The analytical report is shown in table 3.
TABLE 3
4) The remote control and voice prompt functions are added, real-time parameter display, sampling process control optimization, alarming, report functions and the like of the field process are integrated into a remote control interface of an upper computer, and effective monitoring and daily management of the field process are achieved. The remote control interface is shown in fig. 2.
The remote control interface integrates the functions of real-time parameter display, sampling process control optimization, alarming and reporting; the voice prompt comprises sample volume full tank prompt and equipment fault alarm, wherein a sample collection tank is full at 20kg, when the sample volume is greater than 18 kg, a sample barrel is sent out to be full, and a sample collection voice prompt is sent out for three times continuously, if the sample is not collected in time, the sample volume is greater than 20kg, the sampling machine does not sample any more, and blockage and sample volume spilling are avoided. The remote monitoring of the sample amount is realized, the field observation of operators is effectively realized, and the labor intensity is reduced. Alarm information of sampling function diagnosis, picture prompt and voice prompt. When the sampling machine has a fault or the fault is diagnosed and analyzed by the system, the voice prompt is used for timely checking and maintaining, so that the fault expansion is avoided.
The remote interface displays the states of all devices, start-stop operation, sampling control parameters, belt flow, coal types, sampling barrel weight and the like of the sampling machine, controls the start-stop and sampling processes of the sampling machine through interface button operation and parameter adjustment, realizes remote control, and automatically adjusts sampling intervals of multiple coal types or single coal types according to flow change so as to compensate the influence caused by coal flow change. Meanwhile, the report forms provide the action condition of the sampling head, the data statistics of the coal sample amount, the heat value deviation analysis and the like, provide a data base for diagnosis and analysis, and improve the daily management level.
Therefore, the system for sampling as-fired coal and analyzing the coal quality has universality and important popularization significance. The remote control and voice prompt functions can be realized by establishing communication with field equipment; the optimization of sampling time of multiple coal types and sampling of quality level of single coal type can effectively overcome the problem caused by variable coal flow; meanwhile, the functions of diagnosis, analysis and report can be further realized by utilizing the acquired data, so that the field process is effectively monitored, and the economic benefit of the power plant operation is improved.
The main innovation points of the invention comprise:
1) the remote communication function is used for transforming and upgrading field equipment, installing a sensing instrument, matching related network communication equipment and correspondingly optimizing and designing hardware and software.
2) The sampling machine self-adaptive control function is used for optimizing the sampling time during sampling of various coal types according to the relation between the coal flow and the sampling amount, and compensating the influence caused by the coal flow change; meanwhile, the sampling interval is optimized according to the national standard requirement required to be met during sampling of a single coal type.
3) And running report functions including sampling head action conditions, coal sample data statistics, heat value deviation analysis and the like, and providing data for diagnosis and coal quality analysis.
4) The remote control interface and the voice prompt function integrate the real-time parameter display, the sampling process control optimization, the alarm, the report function and the like of the field process into the remote control interface of the upper computer, and realize the effective monitoring and the daily management of the field process.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A coal as fired sampling and coal quality analysis system is characterized by comprising:
the sampler equipment is used for sampling the coal as fired;
the communication equipment is connected with the sampler equipment;
the upper computer is connected with the sampler equipment through communication equipment and comprises a sampler control optimization module, a report analysis module, a voice alarm module and a field real-time data display module.
2. A coal as fired sampling and coal quality analysis system as claimed in claim 1 wherein the sampler device includes a sample sampling barrel having a weighing device mounted thereon for accurately measuring the weight of the sample.
3. The system of claim 2, wherein the weighing device comprises a load cell and a load meter connected to each other.
4. The system of claim 1, wherein the communication device comprises a network switch and a communication fiber for establishing data transmission between the host computer and the sampling device.
5. The system of claim 1, wherein the sampler control optimization module comprises:
the multi-coal sampling time optimization unit is used for optimizing the sampling time during sampling of multiple coal types according to the matching relation between the coal flow and the sampling amount;
and the single coal type sampling interval optimization unit is used for optimizing the sampling interval according to the quality requirement of the sample size required to be met during single coal type sampling.
6. The system for sampling as-fired coal and analyzing coal quality as claimed in claim 5, wherein the multiple coal sampling time optimization unit comprises the following working processes:
when the flow is larger than 900t/h, the sampling interval is automatically adjusted to 200 seconds;
the flow is more than 800 and less than or equal to 900t/h, and the sampling interval is automatically adjusted to 180 seconds;
the flow is more than 600 and less than or equal to 800t/h, and the sampling interval is automatically adjusted to 160 seconds;
the flow is more than 400 and less than or equal to 700t/h, and the sampling interval is automatically adjusted to 140 seconds;
the flow is less than or equal to 400t/h, and the sampling interval is automatically adjusted to 120 seconds.
7. The system for sampling as-fired coal and analyzing coal quality as claimed in claim 5, wherein the sampling interval of the single-coal sampling interval optimizing unit is automatically adjusted to coal-feeding amount/20.
8. The system of claim 1, wherein the report analysis module comprises:
the sampling head action report unit comprises sampling date, time, flow, sample weight and sampling position information and is used for mastering the working condition of equipment and analyzing and judging the performance and faults of the sampling machine;
the report unit of the coal feeding amount and the sampling amount of the multiple coal types comprises information of the number of shifts, the coal types, the coal feeding amount, the starting time, the ending time and the sampling amount, and is used for mastering the coal feeding amount and the sampling amount condition of each shift;
and the heat value deviation analysis report unit comprises the shift, the coal type, the heat value of the corresponding coal type, the coal feeding amount of each shift, the sample amount of each shift, the set coal feeding amount, the total weight of the sample amount, the actual average heat value and the calculation information of the heat value after sampling.
9. The system of claim 8, wherein the thermal value difference analysis report unit specifically analyzes the thermal value difference as follows:
setting the coal feeding amount as T, the corresponding heat value as J, the sample amount as y, the number of coal types as n and a certain coal type as i;
ideal weight of a certain coal: qi ═ Ti/(t1+ t2+ t3+. + tn) × 100%;
sample weight after sampling: qi ═ Yi/(y1+ y2+ y3+. + yn) × 100%;
actual average heat value calculation:
j-flat (T1 × J1+ T2 × J2+ T3 × J3+. + Tn × Jn)/(T1+ T2+ T3+. + Tn);
sample size heat value after sampling:
j is J (Q1-Q1) × J1- (Q2-Q2) × J2- (Q3-Q3) × J3- } - (Qn-Qn) × Jn.
10. The system for sampling as fired coal and analyzing coal quality as claimed in claim 1, wherein the voice alarm module comprises a sample volume full tank reminding unit and an equipment failure alarm unit, and the on-site real-time data display module is used for displaying information of each equipment state, start-stop operation, sampling control parameters, belt flow, coal type and sampling bucket weight of the sampling machine;
the upper computer is internally provided with a remote control interface, and the sampler control optimization module, the report analysis module, the voice alarm module and the field real-time data display module are integrated on the remote control interface.
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| CN111983180A (en) * | 2020-08-26 | 2020-11-24 | 华能陕西秦岭发电有限公司 | Evaluation method and evaluation system for heat value of conveyed fire coal |
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