基于全网平衡理论的热力站个性化质调节
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摘要
介绍集中供热系统全网平衡控制理论。结合工程实例,对基于全网平衡控制理论运行调节的供热系统,在实际运行中出现的问题进行分析,提出采取热力站个性化质调节的解决方案,进行实测验证。某集中供热系统基于全网平衡控制理论运行调节,实际运行中一些热力站二级管网供回水平均温度虽然与设定值十分接近,但用户室内温度过高。选取其中一座热力站作为研究对象,将实测到的2017年2月2日至12日的二级管网日均供水温度、二级管网日均回水温度、日均室外温度、日均室内温度作为数据样本,确定二级管网质调节条件下实际供回水温度计算式中相关参数。在供暖室内设计温度为26、22℃时(供暖室内设计温度26℃为2日至12日实测得到的实际平均室内温度,供暖室内设计温度22℃为需要调整到的预期室内温度),计算不同室外温度条件下二级管网日均供回水温度。在相同室外温度下,供暖室内设计温度为22℃时二级管网计算日均供水温度比26℃时降低3.9~5.6℃(算术平均值为4.75℃),二级管网计算日均回水温度降低2.8~4.5℃(算术平均值为3.65℃)。根据计算结果,在全网平衡控制系统中,对集中调控系统给出的该热力站二级管网供、回水温度分别降低4.75、3.65℃。对该热力站实施个性化调节后的用户室内温度(2017年2月15日—28日)进行实测,用户实测日均室内温度接近预期的22℃,未出现过热情况,说明热力站个性化质调节效果明显。
The whole network equilibrium control theory of central heating system is introduced.Combined with the engineering example,the problems appearing in the operation regulation of the heating system based on the whole network equilibrium control theory are analyzed, the solution for individualized constant flow control of substations is put forward,and the actual test verification is carried out. A central heating system is operated and regulated based on the whole network equilibrium control theory,and in the actual operation,although the average supply water and return water temperatures of secondary circuit of some substations are very close to the set values,but the user indoor temperature is too high. One of the substations is selected as the research object,and the daily average supply water and return water temperatures of the secondary circuit,the daily average outdoor temperature and the daily average indoor temperature measured from February 2 to 12,2017 are taken as data samples to determine the relevant parameters in the calculation formula of the actual supply water and return water temperatures under the condition of constant flow control of secondary circuit. When the heating indoor design temperatures are 26 ℃ and 22 ℃( 26 ℃ is the actual average indoor temperature measured from 2 to 12,and 22 ℃ is the expected indoor temperature to be adjusted),the daily average supplywater and return water temperatures of the secondary circuit under different outdoor temperature conditions are calculated. At the same outdoor temperature,the daily average supply water temperature of the secondary circuit at the heating indoor design temperature of 22℃ is 3. 9 ℃ to 5. 6 ℃ lower than that at the heating indoor design temperature of 26 ℃( the arithmetic mean is 4. 75 ℃),and the daily average return water temperature of the secondary circuit at the heating indoor design temperature of 22 ℃ is 2. 8 ℃ to 4. 5 ℃lower than that at the heating indoor design temperature of 26 ℃( the arithmetic mean is 3. 65 ℃). According to the calculation results,in the whole network equilib-rium control system,the supply water and return water temperatures of the secondary circuit of the substation are reduced by 4. 75 ℃ and 3. 65 ℃ respectively. The user indoor temperatures( February 15 to 28,2017)after the implementation of individualized constant flow control of the substation are measured,the daily average user indoor temperature is close to the expected 22℃,and there is no overheating,which shows that the effect of the individualized constant flow control of the substation is obvious.
The whole network equilibrium control theory of central heating system is introduced.Combined with the engineering example,the problems appearing in the operation regulation of the heating system based on the whole network equilibrium control theory are analyzed, the solution for individualized constant flow control of substations is put forward,and the actual test verification is carried out. A central heating system is operated and regulated based on the whole network equilibrium control theory,and in the actual operation,although the average supply water and return water temperatures of secondary circuit of some substations are very close to the set values,but the user indoor temperature is too high. One of the substations is selected as the research object,and the daily average supply water and return water temperatures of the secondary circuit,the daily average outdoor temperature and the daily average indoor temperature measured from February 2 to 12,2017 are taken as data samples to determine the relevant parameters in the calculation formula of the actual supply water and return water temperatures under the condition of constant flow control of secondary circuit. When the heating indoor design temperatures are 26 ℃ and 22 ℃( 26 ℃ is the actual average indoor temperature measured from 2 to 12,and 22 ℃ is the expected indoor temperature to be adjusted),the daily average supplywater and return water temperatures of the secondary circuit under different outdoor temperature conditions are calculated. At the same outdoor temperature,the daily average supply water temperature of the secondary circuit at the heating indoor design temperature of 22℃ is 3. 9 ℃ to 5. 6 ℃ lower than that at the heating indoor design temperature of 26 ℃( the arithmetic mean is 4. 75 ℃),and the daily average return water temperature of the secondary circuit at the heating indoor design temperature of 22 ℃ is 2. 8 ℃ to 4. 5 ℃lower than that at the heating indoor design temperature of 26 ℃( the arithmetic mean is 3. 65 ℃). According to the calculation results,in the whole network equilib-rium control system,the supply water and return water temperatures of the secondary circuit of the substation are reduced by 4. 75 ℃ and 3. 65 ℃ respectively. The user indoor temperatures( February 15 to 28,2017)after the implementation of individualized constant flow control of the substation are measured,the daily average user indoor temperature is close to the expected 22℃,and there is no overheating,which shows that the effect of the individualized constant flow control of the substation is obvious.
引文
[1]江亿.集中供热网控制调节策略的探讨[J].区域供热,1997(2):10-14.
[2]贺平,孙刚.供热工程[M].3版.北京:中国建筑工业出版社,1993:142-144.
[2]贺平,孙刚.供热工程[M].3版.北京:中国建筑工业出版社,1993:142-144.