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The Plan、Arithmetic and Implement of the Concentration Heat-Suppliy System

Author: WeiYongHong
Tutor: ZhaoHongFang
School: Hebei University of Technology
Course: Applied Mathematics
Keywords: concentration heat-supply share equally of the heat quantity PLC RTU
CLC: TU995
Type: Master's thesis
Year: 2002
Downloads: 353
Quote: 6
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Abstract

With the quickly development of the city construction and economy, environmental protection and savingenergy become more and more imPortan. The city concefltfation heat-supp1y also become the trend tO the citypndicularJy to the north city How to make the conc0foraton heatsupply system run in good statUs with highefficiency become a necessary problem to be resolved.There are tWo maturer hest~supply modes in the world. One is the former Soviet Union mode, the other isthe Eatm Euope mode. According to the actual state of our country, in most cities,concentrate heatsuPplysystem adoptions to imitate the Eastem Europe mode. The whole heat-supply system is made uP of the’heatisource and the heat-net. The heat-source provides the heat from hot power station. The heat~not panguwtes the calories ’s even allotment. The heatn0t p8rt is made up of the first nCt and the second nat. Byregulatng the valve of the first-net water-supply pipe, we can chmp the flux in the firstnet Watersupply pipein order tO guaramee the supplied watCr’s temperature of the second-not.In this text, according tO the analysis of heat-supply condition of our coUntry, we adoPted the diSttibutetype and concentratC contrOl of "suppleness cotltrOl" syStem. Real-time supervise and conitol the pivotalheat-state of the heat-net local condol the othrs heatStaes, in order tO reduce equipmenis invest, benefit tosystem exPand and adjust the heat-Stat at the moSt disadvantagous wreath road at mp time.’We present a cotltro1 plan for the concengation heat-suPply systCm,which is "share equally of the heatquanity ". This plan avoids the phenomenon that it is too hot at the nearer of the heatsource but too coId at theend .Most big heat-net use indireCt heat-supply mode, When the fist-net can provide enough thermal energy,the regulating system can run dependably according the initial value. When it is too cold or there is notenough thermal energy in the first-nst so we can not regulate to the initial value even if the valves are alloPened,we must at this time revise initial value of the t6mPeate of the second-net, lower the heat-supplystandard, and make the pots which near the heat-source or far tO the heatsource are both have energy to .,supp1y,tO so1ation the system’s maladustment. We can make sure the temperature of the second-net waterisupplied and watCr-retUrned in the most cold and hot times including our experience, get the temperaturechange curve of the waer-supp1ied in the first-nct and the second-net with the change of temperatllre outdoor.We can figure out the initial value of the watCr supplied tCmperature in the second-net according to the watersupplied temperature in the first-net. through adjuSt the initial vaIue of the water supplied tCmperature in thesecond-net,the amomation systCm can auto run with a depressed Standard tO distribllte the energy averagely.WC presellt the "compensating of heatsupply,’control plan for the concentration heat-suPply systCm inorder to make the automation systCm keep steady relatively and the valves not move frequently. That meansthe controlled temperature al1ow waving in a range in a period. When the change of the temperature indoor isout of the range we enacted,the system begin to regulatC. Compensate the windage last time leave behind }before decide the heatsupply parameter for the next time. we can hold the balance of the htal-supp1y system.?WJLIkXt$&&kin macroscopical with this control pIan.In this teXt,we analyzed the conirol principle of the concentration heat-supply control system, adopted thePID method to settle the parameter, and give out the concrete calculation method and the software andhardware of the control system in the heat-state.

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