CN100363926C - On-line analysing-monitoring system for heat-engine plant pipeline heat-efficiency - Google Patents
On-line analysing-monitoring system for heat-engine plant pipeline heat-efficiency Download PDFInfo
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- CN100363926C CN100363926C CNB2004100181427A CN200410018142A CN100363926C CN 100363926 C CN100363926 C CN 100363926C CN B2004100181427 A CNB2004100181427 A CN B2004100181427A CN 200410018142 A CN200410018142 A CN 200410018142A CN 100363926 C CN100363926 C CN 100363926C
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Abstract
The present invention belongs to the technical field of a thermal power generation system in the thermal power engineering and is characterized in that a heat efficiency on-line analysis monitoring system of a pipeline is designed for a heat-engine plant. The system is mainly composed of a data acquisition system, a database server, a mould calculation server and an input-output device. Applying an anti-balance heat efficiency formula for the pipeline heat efficiency of a power plant can calculate the pipeline heat efficiency of the power plant, the thermal loss distribution of the pipeline system, the thermal loss of a turbo generator set, the heat economy and technical economical indexes of heat efficiency, heat consumption rate, steam consumption rate, etc. of the plant. A device heat flow diagram is displayed on an information screen and a client in real time to generate an operation analysis report or a characteristic curve of the power plant in real time. The present invention can give an overrun alarm to realize online monitoring for the operating status of a main pipeline system of thermal power plant.
Description
Technical Field
The invention belongs to the technical field of a thermal power generation system in thermal energy engineering, and relates to an online analysis and monitoring system for the thermal efficiency of a pipeline of a large thermal power plant.
Background
At present, the average power supply coal consumption rate of thermal power generating units in China is still far from the national advanced level, and is about 60-70g of standard coal/(kW.h), so that the energy-saving potential is huge. Taking a 1200MW thermal power plant (2 x 600MW unit) as an example, nearly ten thousand tons of raw coal are consumed every day, and according to the average annual running time of the unit of 7000h, if the power supply standard coal consumption rate of the plant is reduced by 1g of standard coal/(kW.h), 8400t of standard coal can be saved all year round, and according to the price of the same proportion, only one fuel cost is needed, and more than 400 ten thousand yuan can be saved each year; meanwhile, the emission of a large amount of flue gas (NOx and SOx) with toxic effect and dust can be reduced.
From the practical and theoretical development of energy conservation, the online monitoring and control of the total efficiency of the thermal power plant are particularly important. In the prior art, monitoring systems for steam turbines and boilers exist, but an online pipeline thermal efficiency monitoring system is still blank. If an on-line monitoring system is used for carrying out on-line monitoring on the pipeline heat efficiency, the total efficiency and the heat economy of the thermal power plant can be effectively improved, and the power supply coal consumption rate is reduced.
Disclosure of Invention
The task of the invention is as follows: the thermal efficiency of the pipeline of the thermal power plant and the heat loss distribution of the pipeline system are analyzed and monitored on line, and the safety and the economical efficiency of unit operation are calculated and displayed simply and rapidly in real time.
The technical scheme for solving the technical problem of the invention is as follows: an on-line analysis and monitoring system for thermal power plant pipeline thermal efficiency comprises a data acquisition system, a database server, a model operation server, an information screen and a client, wherein the data acquisition system acquires and stores real-time operation data of a thermal power plant unit; the database server is connected with the data acquisition system, and acquires and stores real-time operation data of the unit; the model operation server is connected with the database server, real-time operation data of the unit is obtained, the thermal efficiency of the pipeline of the thermal power plant is applied in an anti-balance calculation mode, the distribution of the thermal efficiency of the pipeline of the power plant and the thermal loss of a pipeline system of the power plant, the thermal loss of a steam turbine generator unit, the thermal economy and the thermal efficiency of the whole plant, the thermal consumption rate and the steam consumption rate can be calculated, and the operation result is transmitted back to the database server for storage; the information screen and the client are connected with the database server and the model operation server, the device thermal flow graph is displayed on the information screen and the client in real time, a report form or a characteristic curve of the operation analysis of the power plant is generated in real time, the alarm can be exceeded, and the on-line monitoring of the working state of the main pipeline system of the operating thermal power plant is realized.
The calculation formula of the total operating efficiency of the thermal power plant is as follows:
η cp ＝η b η p η e (1)
in the formula:
the boiler efficiency is:
the efficiency of the steam turbine generator set is as follows:
Q b is the boiler heat load; q o The heat consumption of the steam turbine generator unit; q cp Is the heat consumption of the boiler; w e Is the generated energy of the turbo generator set.
The heat efficiency counter-balance calculation formula of the power plant pipeline in the system is as follows:
ΔQ p ＝∑ΔQ i (5)
in the formula,. DELTA.Q i Respectively comprises the following steps: new steam pipeline throttling and dispersing deviceHeat loss, working medium internal and external leakage loss with heat, cold and hot two-stage reheat steam pipeline throttling and heat dissipation loss, water supply pipeline throttling and heat dissipation lossHeat loss of the auxiliary steam system and heat loss of the continuous boiler blow-down system.
The calculations associated with the system according to the thermal power plant principles are:
generating capacity W of steam turbine generator set e ＝3600P e (6)
Heat rate of steam turbine generator set
Standard coal consumption rate of thermal power plant
The system adopts an information screen technology, and can continuously display the heat flow graph and related heat economic indexes in real time for 24 hours.
The system is based on a DCS system, and the functions are realized by adopting a multithread processing mode, a memory table, a graphical representation mode and a modular integration mode.
Compared with the prior art, the invention has the advantages that: the input signals required by the system for analyzing and monitoring are all measurable parameters, and the system is suitable for various conventional thermal power plants, so that the application range is wide. Because the thermal power plant pipeline thermal efficiency counter-balance calculation method is adopted, data acquisition is carried out based on a DCS system, multithreading processing is adopted, a memory table is used, graphical representation is carried out, and a modular integration mode is adopted for operation, the calculation speed and the accuracy of the system are high. Because the technical route is novel, the exhaust enthalpy of the steam turbine does not need to be calculated, and the total calculation and the measurement of the circulating water quantity of a regenerative system do not need to be carried out, so that the heat loss of the steam turbine generator unit of the thermal power plant can be monitored on line, simply and quickly, the heat economy of the whole plant and the technical and economic indexes such as the heat efficiency, the heat consumption rate, the coal consumption rate, the steam consumption rate and the like of the whole plant can be monitored; meanwhile, displaying a device heat flow diagram in real time; monitoring the working state of a main pipeline system of the thermal power plant on line and alarming for overrun; and generating various reports, graphs, characteristic curves and the like of the operation analysis of the thermal power plant in real time according to the needs.
Drawings
FIG. 1 is a hardware configuration diagram of the present invention;
FIG. 2 is a software flow diagram;
FIG. 3 is a flow chart of data collection;
fig. 4 is a data acquisition module.
Detailed Description
The invention discloses a best embodiment, in particular to an on-line analysis and monitoring system for thermal efficiency of a pipeline of a thermal power plant, which consists of a hardware system and a software system. Description of the system operation flow:
a field acquisition data system (DCS system, physical parameters related to steam-water parameter acquisition) — is stored in a DCS database server or a special database server (original data storage database) — > a model operation server extracts data (relevant data output) — through an ADO database engine, necessary conversion and intermediate calculation (conversion of measurable parameters and calculation parameters and conversion of necessary units) — input data (conversion and sequencing of calculation parameters) — required by a model are obtained and substituted into the model for calculation and analysis (through formulas (1) - (8), pipeline heat loss and related heat economy indexes are calculated), and related results are output by an information screen and a client.
The hardware comprises:
as shown in fig. 1 and 2, DCS system: adopts FB-2000NS DCS system produced by Zhejiang Weisheng Automation Co. The communication network architecture of the FB-2000NS DCS system may be divided into a three-tier communication network architecture from the communication medium. The bottom layer is an I/O network (I/O NET) inside the field control station, and a high-speed field bus network is adopted to realize information exchange between the main controller and various I/O processing units. The second layer adopts a high-speed Control Network (CNET) to realize information exchange among the server, the engineer station, the system operation station and the field control station for the process control network. The top layer is used as a System Network (SNET), an industrial Ethernet conforming to a TCP/IP protocol is adopted to connect servers of all control stations and various management computers in enterprises, and the top layer is used for information transmission and management in the enterprises and realizing a main information channel for comprehensive management of factories.
A database server: the device runs on a 32-bit Windows2000 network platform, can be connected with a local area network or a wide area network in a hanging mode, and stores DCS field data and history records. The basic configuration is as follows:
(1) A CPU: P4.4G or more; (2) RAM:512MB or more; (3) hard disk: more than 10 GB; (4) CRT: XVGA15 "(resolution is more than or equal to 1024 x 768); (5) optical drive: more than quadruple speed; (6) software: calculating software of an on-line analysis monitoring system for thermal power plant pipeline thermal efficiency; (7) operating the system: windows2000; (8) network: an Ethemet network card, MODEM and the like; (9) others: mouse, keyboard, and other multimedia accessories.
A model arithmetic unit: the system runs on a 32-bit Windows2000 network platform, can be connected with a database server and a client by hanging a local area network or a wide area network, and performs operation by utilizing a calculation model of the thermal power plant pipeline thermal efficiency on-line analysis and monitoring system. The basic configuration is as follows:
(1) A CPU: P42.4G x 2 or more; (2) RAM:512MB or more; (3) hard disk: more than 10 GB; (4) CRT: XVGA15 "(resolution is more than or equal to 1024 x 768); (5) optical drive: more than quadruple speed; (6) software: calculating software of an on-line analysis monitoring system for thermal power plant pipeline thermal efficiency; (7) operating the system: windows2000; (8) network: an Ethemet network card, MODEM and the like; (9) others: mouse, keyboard, and other multimedia accessories.
A client: the system runs on a 32-bit Windows2000 network platform, can be connected with a local area network or a wide area network in a hanging mode, is connected with a model operation server and a DCS database server, and displays characters, data and graphs to obtain efficiency evaluation; and the functions of history inquiry, printing and the like can be performed. The basic configuration is as follows:
(1) A CPU: P42.4G or more; (2) RAM:512MB or more; (3) hard disk: more than 10 GB; (4) CRT: XVGA15 "(resolution is more than or equal to 1024 x 768); (5) optical drive: more than quadruple speed; (6) software: calculating software of an online analysis monitoring system for the thermal efficiency of the pipeline of the thermal power plant; (7) operating the system: windows2000; (8) network: an Ethemet network card, MODEM and the like; (9) others: mouse, keyboard, and other multimedia accessories.
The software comprises the following steps:
the device comprises a data acquisition and conversion module (online or offline), a data processing module (model processing), an output and storage module (performance evaluation is obtained).
The data acquisition module is divided into an online mode or an offline mode. The online mode directly obtains the measuring point data from the DCS system database, and necessary verification, conversion and intermediate calculation are carried out to obtain parameters which are provided for the data processing module; the off-line mode provides a data input interface, and a user can directly input measuring point data, perform necessary verification, conversion and intermediate calculation to obtain parameters and provide the parameters to the data processing module.
And the data processing module analyzes the parameters according to a calculation model of the thermal power plant pipeline thermal efficiency on-line analysis monitoring system.
The output and storage module adopts the mode of characters, figures and numbers to display and stores the necessary results for history analysis and printing.
The running environment is Windows32, and is developed by delphi. The data acquisition and conversion module (online or offline) comprises a data processing module (model processing) + an output and storage module (obtaining the efficiency evaluation).
Claims (3)
1. The on-line analysis and monitoring system for the thermal power plant pipeline thermal efficiency is characterized by comprising a data acquisition system, a database server, a model operation server, an information screen and a client, wherein the data acquisition system acquires and stores real-time operation data of a thermal power plant unit; the database server is connected with the data acquisition system, and acquires and stores real-time operation data of the unit; the model operation server is connected with the database server, real-time operation data of the unit are obtained, the inverse balance calculation formula of the pipeline thermal efficiency of the power plant is applied, the technical and economic indexes of the pipeline thermal efficiency of the power plant and the heat loss distribution of a pipeline system of the power plant, the heat loss of a steam turbine generator unit, the whole plant heat economy and the thermal efficiency, the heat consumption rate and the steam consumption rate can be calculated, and the operation result is transmitted back to the database server for storage; the information screen and the client are connected with the database server and the model operation server, the device thermal flow graph is displayed on the information screen and the client in real time, a report form or a characteristic curve of the operation analysis of the power plant is generated in real time, the alarm can be exceeded, and the on-line monitoring of the working state of the main pipeline system of the operating thermal power plant is realized.
2. An on-line thermal efficiency analysis and monitoring system for thermal power plant pipeline as claimed in claim 1, wherein the thermal efficiency counter-balance calculation formula of the thermal power plant pipeline is as follows:
in the formula eta p The thermal efficiency of the pipeline of the thermal power plant is obtained; delta Q p For heat losses in the pipe system, where Δ Q i The contents of (a) are respectively: throttling and heat dissipation loss of a new steam pipeline, internal and external leakage loss of a working medium with heat, throttling and heat dissipation loss of a cold and hot two-stage reheating steam pipeline, throttling and heat dissipation loss of a water supply pipeline, heat loss of an auxiliary steam system and heat loss of a continuous boiler blowdown system; q b Is the boiler heat load.
3. The on-line thermal efficiency analysis and monitoring system for the thermal power plant pipeline as claimed in claim 1, wherein: the information screen and the client can continuously display the device heat flow graph and related technical and economic indexes in real time for 24 hours.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101877720A (en) * | 2010-05-25 | 2010-11-03 | 中电投远达环保工程有限公司 | B/S structure-based discrete data point curve structural system and structural method thereof |
| CN102799161B (en) * | 2012-08-13 | 2014-11-05 | 浙江大学 | Performance index correcting and comparing method of combined cycle generating unit |
| CN103679549B (en) * | 2013-12-02 | 2016-09-14 | 中国南方电网有限责任公司 | Energy-saving for Thermal Power Units Potentials method |
| CN103728071B (en) * | 2014-01-24 | 2015-12-09 | 国家电网公司 | A kind of fired power generating unit maximum output measuring method |
| CN103968880A (en) * | 2014-05-06 | 2014-08-06 | 胡妍 | Area environmental protection monitoring system for power supply system |
| CN107464065B (en) * | 2017-08-22 | 2020-05-12 | 青岛鸿瑞电力工程咨询有限公司 | Method for calculating pipeline thermal efficiency of large-scale thermal power plant |
| CN109709911B (en) * | 2018-12-11 | 2021-06-22 | 上海电力学院 | On-line measuring method and system for leakage of circulating working medium of thermal power generating unit |
| CN111581787B (en) * | 2020-04-20 | 2023-05-30 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Method and system for screening heat rate analysis data of steam turbine in real time |
| CN111680911B (en) * | 2020-06-03 | 2022-07-08 | 江苏方天电力技术有限公司 | Online energy consumption calculation system and calculation method for thermal power plant |
| CN111794813B (en) * | 2020-06-30 | 2022-09-27 | 中国神华能源股份有限公司国华电力分公司 | Method and device for monitoring operation performance of steam turbine and electronic equipment |
| CN113283701B (en) * | 2021-04-22 | 2024-03-19 | 李智才 | Power generation and heat supply coal consumption accounting system under conventional operation mode of thermal power generating unit |
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| US20040031256A1 (en) * | 1998-08-31 | 2004-02-19 | Rollins William S. | High power density combined cycle power plant system and method |
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Assignee: Shanghai Miya Jinqiao Energy Co., Ltd. Assignor: Shanghai University of Electric Power Contract fulfillment period: 2008.8.11 to 2013.8.10 contract change Contract record no.: 2009310000251 Denomination of invention: On-line analysing-monitoring system for heat-engine plant pipeline heat-efficiency Granted publication date: 20080123 License type: Exclusive license Record date: 2009.10.9 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.8.11 TO 2013.8.10; CHANGE OF CONTRACT Name of requester: SHANGHAI MEIYA JINQIAO ENERGY CO., LTD. Effective date: 20091009 |
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