Feasibility Study of Using Geothermal Heat-Pump Units for Substituting Small-Capacity Coal-Fired Boiler Houses (Taking the Baikal Natural Area as an Example)

I. Yu. Ivanova; V. A. Shakirov; M. V. Ermakov; F. S. Bukher

摘要

— The economic feasibility of substituting small-capacity coal-fired boiler houses with geothermal heat-pump units in the central ecological zone of the Baikal natural area is analyzed. Three versions of a space-heating system equipped with heat-pump units are considered depending on the source of low-grade heat and the method for extracting it: a well, a horizontal ground collector, and a water basin (Lake Baikal). The study is carried out for the raions of the Irkutsk oblast and the Republic of Buryatia located in the most favorable natural and climatic conditions in the southern part of the Baikal natural area’s central ecological zone, which have different economic conditions in terms of electricity tariffs and fuel cost. A conditional small-capacity coal-fired boiler house having averaged technical characteristics is taken as the base version for comparing it with heat-pump units. A monovalent mode of heat-pump unit operation is considered taking into account a shift for using a low-temperature space-heating system. The economic feasibility of substituting a coal-fired boiler house is estimated proceeding from the equality between the total discounted costs for implementing a space-heating system equipped with heat-pump units and costs for operation of the coal-fired boiler house for the considered period of time. The dependences of the total discounted costs for the alternatives being compared have been obtained, using which it is possible to determine the level of electricity tariffs and coal prices at which the application of heat-pump units in the studied region becomes economically feasible. The influence of possible deviations of the conditions in a particular locality from the conditions typical for the analyzed regions that were adopted for consideration is taken into account. It can be concluded from the obtained results that, given the current prices for coal and electricity, it is not economically feasible to substitute small-capacity coal-fired boiler houses with heat-pump units under the natural and climatic conditions of the considered regions. The use of heat-pump units may become justified with a coal price equal to 5000–8000 rubles/t and electricity tariffs equal to 2–4 rubles/(kW h); in this case, the discounted payback period of investments will make approximately 30 years.

机译：- 分析了百吉岩天然区域中央生态区内用地热泵装置取代小型燃煤锅炉房的经济可行性。根据低级热的源和提取井的方法，考虑配备有热泵单元的三种空间加热系统的三种版本：井，水平地面收集器和水盆（贝加尔湖）。该研究是为伊尔库特克州的绳索和伯亚蒂亚共和国的绳索，位于贝加尔卡尔自然地区中央生态区南部最有利的自然和气候条件下，这在电力关税方面具有不同的经济条件燃料成本。具有平均技术特性的条件小型容量燃煤锅炉房子作为与热泵单元进行比较的基础版本。考虑使用低温空间加热系统的转变考虑了一种单价的热泵单元操作模式。替代燃煤锅炉房屋的经济可行性估计从总折扣成本之间的平等进行，该加热系统配备了热泵装置和燃煤锅炉房的运行成本，以便考虑期间时间。已经获得了比较替代品的总折扣成本的依赖，可以使用该替代品的替代成本，使用该替代品可以确定电费和煤炭价格的水平，其中热泵单元在研究中的应用在经济上是可行的。考虑到所采用的分析区域的典型条件的特定情况下可能偏差的影响。从获得的结果中可以得出结论，鉴于当前煤电价格，在所考虑的地区的自然和气候条件下将小容量燃煤锅炉房屋用热泵装置代替小型容量燃煤锅炉房，这是不可行的。使用水泵单元的使用可能与煤价格相当于5000-8000卢布/ T和电关税等于2-4卢布/（kW h）;在这种情况下，投资的折扣投资回收期将大约30年。

Feasibility Study of Using Geothermal Heat-Pump Units for Substituting Small-Capacity Coal-Fired Boiler Houses (Taking the Baikal Natural Area as an Example)

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