| The low calorific value heat source is very rich,widely exists in all kinds of production processes,and is considered as the fifth conventional energy after coal,petroleum,natural gas and hydraulic power.Making full use of low heat energy is one of the important means to realize the strategic goal of energy saving and emission reduction.Most coal mines require an air compressor to compress the air.Most of the electricity is converted into heat and is released into the atmosphere by means of heat release equipment.To deal with the air compressor waste heat,and will make use of the low-grade heat sources,has good environmental and economic benefits;and low heat energy in the air with its inexhaustible,inexpensive,safe,clean and pollution-free characteristics of attention.This paper takes the bathroom renovation project of Xingtai mine in Hebei,Xingtai Province as an example,uses the waste heat recovery system to recycle the waste heat of the air compressor for heating bath water.Due to the limited power of the Xingtai mine fan,the waste heat recovery of the air compressor combined with air source heat pump is put forward.Under extreme weather conditions,the electric heating is turned on to make up for the lack of heat.This paper analyzes the principle,operation mode,and the control system of the system,and the combination of the design method of heating system in practical engineering,compared with the single source system of multi heat source system can improve the stability of the system,and by adjusting the heat output according to the efficiency of optimization,adjustment of heat input and heat source sequence,realize energy cascade utilization obviously,collaborative heating,improve economic efficiency,creating conditions for the safety of coal production and enterprise energy saving and emission reduction.In similar projects,the majority still use traditional two-dimensional CAD mapping,the project in the design process using BIM technology for 3D drawing of the project,and on the official website of integrated design of the collision analysis,and then optimize the drawings,reduce the change in design and construction,for the timely completion of the project provided a guarantee.Through the analysis of energy saving,economic and environmental benefits of the system,the following conclusions are drawn:1.Air compressor waste heat utilization efficiency ratio is 18.3,air energy is 5.2,electric heating is 0.966;air compressor waste heat is the most preferential utilization of heat energy,air can next,as far as possible to reduce the use of electric heating.2.Through the system and the coal-fired boiler system analysis and comparison,the project investment amounted to 2 million 920 thousand yuan,compared with the original coal-fired boiler operation cost comparison of annual savings of 1 million 266 thousand yuan,is the capital of Xingtai coal mine static payback period is 2.3 years,the payback period is short,have obvious economic benefits.3.According to energy conservation analysis and estimation,the project can reduce 2650 tons of coal per year.Because the project is not the direct discharge of polluting gas,per ton of coal can produce 2.6 tons CO2,0.02 tons of SO2 per year,so fewer emissions of 6890 tons of CO2,in accordance with the requirements of prevention and control of the greenhouse effect,and SO2 emissions can be reduced by 53 tons,while reducing soot emissions immeasurable,has certain effect on inhibiting haze play.Waste heat of air compressor,air source heat pump,electric heating co heating system,the greatest significance lies in the complementary advantages,enhance the air compressor waste heat and air to the use of the two kinds of low rate of heat energy,to reduce the consumption of primary energy. |
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