`` District Heating '' 2019 Issue 4
Rural clean heating
Zhang Qunli; Zhang Xiaoyue; Hao Yangyang
Beijing Key Laboratory of Heating, Gas and Ventilation and Air Conditioning of Beijing Jianzhu University
Abstract: This article analyzes the clean energy transformation process and emission reduction benefits in Beijing . Based on actual cases, it compares and analyzes the economic efficiency of three different clean energy heating methods of low-temperature air source heat pumps, heat storage electric heaters, and gas-fired boilers. The conclusion is that under the premise of government equipment and electricity price subsidies, the economic advantages of using a low-temperature air source heat pump heating method are more obvious and the comfort is the highest. Therefore, in the clean energy transformation process, low-temperature air-source heat pumps are more worthy of popularization.
Keywords: rural areas; clean energy transformation; emission reduction benefits; economics;
Ao Xin; Deng Qinqin; Wang Yilin; Gao Hexuan; Song Bo;
Shenyang Jianzhu University; China Academy of Building Research; Beijing Jianzhu University
Abstract: With the development of urbanization in China, rural areas have changed from the situation of living and living in the countryside 30 years ago to the needs of ecological civilization such as living in a proper place and living in a safe place. Existing residential buildings in rural areas in China have a long history of construction and large stocks. The thermal insulation performance of the envelope structure is poor. The room temperature in winter is generally low. The energy consumption of buildings and the energy level of residents are uneven, and basic data are lacking. Based on this, this paper carried out data collection, questionnaire surveys and field visits to the types of existing housing structures in rural areas of China's "Three Norths", the Yangtze River Basin, and Tibet. Energy consumption level and energy consumption structure of farm houses. Based on the survey data of typical regions, a typical farm house model was established, and energy consumption analysis was performed using DeST energy simulation software, and the existing rural house energy efficiency improvement strategies were proposed. The results of this study are expected to have certain reference significance for the energy-saving renovation of rural houses in China.
Keywords: rural; envelope structure; energy use method; field investigation;
Ma Cuiya; Yang Kaimin; Wang Yuancheng;
School of Thermal Engineering, Shandong Jianzhu University
Abstract: Dry processing of agricultural products is a high energy-consuming process, which directly or indirectly pollutes the environment. Therefore, the agricultural product processing industry urgently needs energy-saving and efficient drying technology and equipment. At present, the drying methods of agricultural products include heat pump drying, solar drying, microwave drying, freeze drying, and combined drying technologies. Among them, the heat pump drying technology has the advantages of energy saving and environmental friendliness. This article introduces the specific application of heat pump in the drying process of agricultural products, discusses and analyzes the advantages and characteristics of heat pump technology in the drying of agricultural products, and the joint and complementary with other energy-saving technologies. Measures and prospects for the development of heat pump drying.
Keywords: heat pump; agricultural product drying; environmental protection; energy saving;
Wang Gang; Wu Yunhe; Wu Dan;
School of Environmental and Municipal Engineering, Qingdao University of Science and Technology; Qingdao Municipal Heating Office
Abstract: In order to reduce the energy consumption of rural buildings and improve indoor thermal comfort, taking a rural house in Qingdao as an example, an energy-saving transformation plan such as exterior wall insulation, exterior window optimization, roof insulation, and increased air tightness was designed. Energy consumption simulation analysis, comparing various optimization measures and overall energy saving potential. The results show that the energy saving rate after the overall reconstruction of the building is 71.05%, and the energy saving potential is large. The energy saving rates of the external walls and external windows in the measures are 31.23% and 31.95%, respectively, which should be the focus of energy saving reconstruction. Based on the characteristics of rural houses and residents' habits, the specific measures for energy-saving reconstruction were discussed.
Keywords: rural housing; energy saving potential; energy consumption simulation; energy saving transformation;
Zhao Yulei; Liu Chunhua;
Shandong Huayu Institute of Technology
Abstract: The development of small-scale biomass clean heating, replacing small coal stoves, is an important measure to promote clean heating in the north. This article tracks the practical application cases of small hot water biomass heating furnaces, analyzes the comfort and economy of the product, and compares the cost with electric and gas heating. Biomass heating has low system costs and low operating costs. Advantage. At present, the cost of biomass particles is excessively high due to the accumulation of costs caused by multiple circulation links. Substituting processing should be used to reduce intermediate links, which can reduce heating costs to below the cost of coal-fired heating. Relevant authorities strengthen supervision and establish relevant standards in order to improve product quality. Government support and guidance will help promote the popularization of biomass heating and provide important support for the realization of decentralized clean heating alternatives in northern villages and towns.
Keywords: clean heating; heating furnace; cost; biomass;
Beijing Thermal Power Group Co., Ltd.
Abstract: Achieving clean heating in rural areas is a long-term and arduous task. It cannot be done overnight, let alone "double generations". We must adhere to the principles of "top-level design, government guidance, market promotion, adapting to local conditions, diverse forms, and sustainable development" in order to really do this job.
Keywords: rural; clean heating; policy; environmental protection;
Beijing Thermal Engineering Design Co., Ltd.
Abstract: This article takes a typical rural building in North China as an example. Through the calculation of energy consumption in five cases with or without insulation at different parts of the envelope structure, and comparison with measured data, it quantifies the energy consumption, operating costs and environmental impact The significance of the thermal insulation of the envelope structure, further puts forward the importance of promoting the energy conservation of buildings in the comprehensive utilization of energy, and puts forward a number of specific measures and implementation suggestions to promote energy conservation in buildings.
Keywords: thermal insulation; energy consumption; cost; environmental protection;
Yan Xiaodong; Dong Bingli; Wu Rentong; Sun Pengju; Sui Xin; Zhang Huapeng;
Yantai Dongchang Heating Co., Ltd .; Yantai Houderuihua Energy Saving Technology Co., Ltd.
Abstract: This article uses an air source heat pump for heating in a bungalow in Yantai, Shandong, as an example.By tracking data from two heating seasons, this paper analyzes the different heating effects of air source heat pump combined floor heating, radiators, and floor-mounted fan coils. The degree of influence of external wall insulation before and after heat preservation on energy saving, and also discussed the influencing factors of air source heat pump energy efficiency ratio and the problems in actual operation.
Keywords: air source heat pump; bungalow heating; end equipment; wall insulation; energy efficiency ratio;
Jiang Guoxin; Wang Liang; Du Tiantian;
School of Thermal Engineering, Shandong Jianzhu University
Abstract: The article adds fins to smooth round tubes to enhance the heat transfer effect between air and paraffin. By establishing a numerical heat transfer model and performing heat transfer effects on heat storage air pipes with different rib spacing and different fin height The results show that under the condition that the air inlet speed is 0.5m / s and the initial inlet temperature is 333K, the change of the inlet temperature is adjusted with the change of heat storage time, and the overall heat transfer effect of the rib spacing of 150mm is the best; the melting of paraffin The volume increases with time and the inlet temperature increases, but the melting rate gradually decreases; when the rib height is 2.5mm, compared with the other four rib heights, the overall heat transfer effect is better; the paraffin heat storage body air 6 hours before the heat release The average heat is about 48.44W, and the next 4 hours is about 46.86W.
Keywords: paraffin heat storage; fins; pitch; height; melting volume; heat gain;
Li Jibin; Li Fuhua; Jiang Changtian;
Zibo Utility Service Center; Zibo Thermal Power Co., Ltd.
Abstract: This article summarizes the promotion and application of clean energy in the rural areas of Zibo in the past two years, and makes a comparative analysis, research, and discussion of the practical applications of several clean energy sources. Industrial waste gas, urban sewage (water source), soil source, air and other heat source use choices and economic analysis, a simple analysis of the current problems in the development of clean heating, and several ideas and suggestions for the development of clean energy in rural areas, exploring new models of clean heating In this paper, the "rural recycling ecological chain + heating" model was preliminarily studied, and the experience of replication and promotion could be formed. Among them, the "solar energy + multi-energy complementary + smart heating" model was promoted and applied.
Keywords: combined heat and power; clean energy; heat pump; multi-energy complementation; COP; energy saving and environmental protection;
Operation Management World
Liu Yanan; Jiang Ze
Changchun Heat Power (Group) Co., Ltd.
Abstract: The hydraulic balance adjustment devices of heating pipe networks used in China can be divided into two categories: one is to use the regulating valve to change the resistance of the pipe network, which is called throttling hydraulic balance; the other is to change the pipe network by the speed of the pump The flow is called active hydraulic balance . How to organically combine the two regulation technologies and make scientific and reasonable use is a difficult problem for heating enterprises. This article introduces the practical experience of pump-valve linkage application technology in three cases, namely: the linkage of the pressure pump on the primary side of the heating network and the control valve on the same side, and the linkage of the primary control valve and the secondary side circulation pump on the heating network. Multi-system pumping station primary side variable frequency pump and zone control valve linkage technology application practice.
Keywords: smart heating; heating system; operation regulation; pump-valve linkage; energy saving;
Zhang Ming; Zhang Ranran; Qi Xuefang;
State Power Investment Corporation Henan Electric Power Co., Ltd .; Tianjin Yujing Hi-tech Engineering Design Co., Ltd.
Abstract: This article is based on an office building in Zhengzhou City. In order to meet the heating and cooling needs after the transformation, from the perspective of technical performance and investment and operating costs, different solutions are compared and analyzed. The best solution is to choose an air-enhanced air source heat pump system. The system has widened the operating temperature range and improved the system operating COP. After statistical transformation, the operating data of the air-jet heat-source heat pump system with increased enthalpy, the average power consumption of the system during heating and cooling seasons were 0.154 kWh / (m2 · d) and 0.1776 kWh / (m2 · d), respectively.
Keywords: office building; air jet enthalpy; air source heat pump; COP; power consumption;
Jilin Province Thermal Engineering Design and Research Co., Ltd.
Abstract: This paper mainly discusses the technical scheme of a long-distance large-height differential heat and power cogeneration project. Combined with the characteristics of a project, a more comprehensive technical and economic analysis is carried out using scientific methods, so as to determine a technical and economical reasonable and feasible system scheme.
Keywords: combined heat and power; multi-heat source interconnection; hydraulic; water hammer; analysis;
Gong Lianwei; Deng Weimin; Deng Guannan;
Qingdao Energy Thermal Power Group Hengyuan Thermal Power Co., Ltd .; Qingdao Deheng Construction Industry Co., Ltd.
Abstract: Based on the characteristics of reverse osmosis mixed-bed and primary double-bed mixed-bed water treatment processes that are popular in the thermal power industry, this paper discusses the use of grouped water treatment desalination processes for different water production systems with the same or similar output Reconstruction, adding communication pipelines and related communication valves, configuring inverters to adjust the related pump lift and flow rate, and implementing different technological process groups, so that existing water treatment equipment can adapt to fluctuations in raw water quality and achieve stable water system operation. The purpose is to improve the quality of produced water, reduce operating costs, and reduce environmental impact.
Keywords: reverse osmosis; ions; flow; conductivity; marshalling;
Tianjin Energy Investment Group Co., Ltd.
Abstract: Aiming at some basic situations of large-scale heating enterprises facing convenience services, the construction of an efficient convenient service management system based on an integrated online platform is proposed, and a case of constructing an efficient service management system is given in combination with the management practices of Tianjin Energy Group to achieve convenience. Service level, economic benefits and brand image.
Keywords: integration; efficient convenience; service management; system construction;
Clean energy heating
Zhu Xiaozhang; Song Bo; Liu Song; Zhang Sisi; Li Jia;
China Academy of Building Research; China Architectural Design & Research Institute
Abstract: This article analyzes the effect of graphene electric heating on a rural house in Cangzhou, Hebei Province. Through the test of indoor and outdoor temperature, heating power and power consumption during the test, the effect and economics of graphene electric heating are analyzed. It is proposed that with the support of the peak-valley electricity price policy for electric heating, the annual operating cost of graphene electric heating is similar to that of conventional loose coal heating, and the indoor air quality is improved. The demand for power capacity is high. Considering the cost of capacity increase, this technology is more suitable for small-area users and intermittent operation.
Keywords: graphene; electric heating; test; effect;
Du Han; He Lixia; Zhao Yun;
School of Thermal Engineering, Shandong Jianzhu University
Abstract: During the construction and operation of the parallel solar-air-energy composite system simulation system, the collector area is selected based on the maximum instantaneous load during the heating season throughout the year, and some data are set based on empirical values in order to further optimize the collector. Area and collector-side control strategies to reduce the initial investment and operating costs of the system. This article will use the TRNOPT optimization module in TRNSYS to obtain the collector area and collector with the lowest comprehensive cost of the system during 15 years of operation. Control strategy. The research results have certain guiding significance for clean heating in rural areas of Shandong Province.
Keywords: solar energy; air energy; control strategy; optimization design;
Jilin Province Thermal Engineering Design and Research Co., Ltd.
Abstract: With the expansion of the city scale and the improvement of people's living standards, the discharge of urban domestic sewage has increased year by year. Municipal sewage is a valuable renewable energy source. In order to make full use of this heat, relevant national departments have vigorously constructed urban sewage treatment plants. The quality of the secondary effluent of the sewage treatment plant is good, the water is large, and the temperature is suitable. The comprehensive use of this renewable energy can bring huge economic benefits to the society. This paper starts with the working principle of sewage source heat pump technology, and discusses the application of sewage source heat pump technology in urban residential heating system with engineering examples.
Keywords: sewage source heat pump; heat supply; sewage thermal energy;
Zhou Weifei; Wang Jingbin;
Hebei Huare Engineering Design Co., Ltd. Henan Branch
Abstract: The large losses of flue gas and condensing heat in power plants make the energy utilization rate of coal-fired units too low. How to effectively use such waste heat has become the focus of research at this stage. In this paper, the combination of the boiler tail flue reconstruction and the installation of an absorption heat pump is used to improve the energy utilization rate and provide a heat source for heat users. During the non-heating period, the boiler feedwater can be heated by the flue gas heat exchanger, which can save 17,600 tons of standard coal. During the heating period, the 600MW wet cooling unit can achieve a heating capacity of 36.14MW without affecting the power generation.
Keywords: waste heat utilization; heat supply; combined heat and power; absorption heat pump; low temperature economizer;
An Lei; Hao Jing;
Jilin Province Thermal Engineering Design and Research Co., Ltd.
Abstract: The combined heat and power system with an internal combustion engine as the power generator generates a large amount of flue gas waste heat and cylinder liner water waste heat during operation. In order to recover the waste heat of the system in depth, based on the principle of "energy cascade utilization", an integrated scheme of combined heating and cooling and heating subsystems was established, and a mathematical model of each component in the system was established. Based on the experimental data of a 16kW internal combustion engine generator set, the thermal performance of the system is analyzed from the aspects of recovery of residual heat and coefficient of performance. The results show that the increase of the power of the internal combustion engine or the decrease of the ambient temperature can increase the residual heat recovery of the system. This study provides a reference for the deep recovery of waste heat in a combined heat, power, and heat system.
Keywords: combined cooling, heating and power; waste heat recovery; performance;
Experiment and research
Ma Xiaofeng; Guo Jianxiang; Peng Shengnan;
College of Environmental and Municipal Engineering, Qingdao University of Technology
Abstract: Aiming at the pollution caused by the coal-based heating method in the northern region, this paper proposes a solar-air source heat pump heating system. A transient simulation software TRNSYS is used to establish a system simulation model. The value is an objective function. The Hooke-Jeeves optimization algorithm is used to optimize the design parameters of the system such as: collector area, collector azimuth, collector inclination, heat storage tank volume, and air source heat pump rated heating capacity. Through optimization analysis and calculation of a typical case of a rural independent house in Qingdao area, the results show that the system has good heating performance and economy.
Keywords: system optimization; Hooke-Jeeves algorithm; annual cost; solar heating; TRNSYS software;
Zhang Yan; Ding Yuxian; Niu Jiangang;
School of Civil Engineering, Inner Mongolia University of Science and Technology
Abstract: Building shape coefficient is one of the parameters of energy-saving design index, but there are few studies on its influence on the optimal thickness of external insulation. In this paper, through DeST energy consumption simulation, a mathematical model of the optimal thickness of the external insulation is established, and the influence of the shape coefficient on the optimal thickness is explored while keeping the building height H and perimeter L constant. The research results show that after the energy-saving insulation measures are taken, the energy consumption per unit building area increases as the body shape coefficient decreases; the building body shape coefficient is positively related to the total life cycle cost and negatively related to the optimal thickness of the external insulation; from absolute economy In the incremental perspective, the actual reference value of the shape coefficient on the total cost in the life cycle is greater than the effect on the optimal thickness.
Keywords: body shape coefficient; energy consumption simulation; thermal insulation system; economic model; optimal thickness;
Central Huanhui Technology Group Co., Ltd.
Abstract: The goal of intelligent heating is to provide precise and real-time heating according to demand. The method is to collect data to fine-tune the output. There is no evaluation method for the quality of the adjustment, which affects the full use of functions and the survival of the fittest at different levels of technology. This paper proposes a calculation method for energy consumption benchmarks, which can calculate reasonable energy consumption for any length of time during heating, and is used to guide and evaluate the operation and regulation of production personnel; this paper also proposes an algorithm for operation regulation coefficients, which can quantitatively evaluate the level of operation regulation The method is not affected by the meteorological differences. It can evaluate and evaluate several heating stations and heating companies, and push the enterprise management and industry management to a new level.
Keywords: energy consumption benchmark; operation regulation; evaluation; energy saving and consumption reduction; smart heating;
Wu Jinxiang; Zhao Tao; Liu Liansheng; Chen Chunyao; Wang Xiaolan; Wang Xiangwei;
Hebei University of Technology; Chengde Thermal Power Group Co., Ltd.
Abstract: Based on the actual project of a heat exchange station in Chengde Thermal Power Group, a Flowmaster model is established, the actual working conditions are analyzed, and an optimal adjustment scheme is proposed. Through a comparative analysis of different working conditions, it is found that reducing the flow can significantly reduce the power consumption of the pump, and the reduction in heat supply caused by reducing the flow can be compensated by increasing the temperature of a small amount of water. The mass-flow co-ordinated operation scheme not only conforms to the temperature change rule and the human body's daily habits, but also can greatly save the power consumption of the circulating pump. Whether it is necessary to improve energy efficiency, reduce business costs, or improve heating quality.
Keywords: centralized heating; heat exchange station; operation mode; energy saving;
Li Jun; Zhou Xiaoqing
School of Civil Engineering, Guangzhou University; Institute of Building Energy Efficiency, Guangzhou University
Abstract: With the increasing demand for optimized energy allocation and clean heating, improving the heat transfer efficiency of solid-liquid phase heat storage has become an important issue in phase change heat storage, especially the natural convection effect. In this paper, the effects of natural convection and non-convection on the melting process of a horizontal single-tube shell-and-tube Ba (OH) 2 · 8H2O thermal storage device are studied using numerical simulation methods. The phase interface of the melting process is described in detail. The results show that during the melting process, convective heat transfer becomes the dominant mode of heat transfer within 5min to 30min, and the liquid materials at higher temperatures rise, while the liquid materials at lower temperatures drop, resulting in cyclic convection, which makes the upper region phase Compared with the lower region of the heat exchange tube, the natural convection accelerates the heat transfer efficiency in the upper region of the heat transfer tube, but has a small impact on the heat transfer efficiency in the lower region. In general, natural convection shortens the melting time of phase change materials by 19.23%.
Keywords: phase change material; heat storage; natural convection; computational fluid simulation;