Engineering Design And Research On Liquefied Natural Gas-combined Cooling Heating And Power(LNG-CCHP) System

As countries island dispute continuously and the development of Marine economy, thedevelopment of the island became research hotspot, energy supply of the island becomes thekey to the development and utilization of its success. The small thermal power will seriouslyaffect the island do not meet the requirements of environmental protection of the ecologicalenvironment; Solar power plants is limited by geographical space; Wind power, tidal power,etc. for covering and electricity quality problems such as limited; And the operation control ofthe small nuclear power complex. LNG transported by ship to the island to establishtrigeneration systems, power generation and can solve the effects of other power generationmethod, the optimization of energy utilization. So LNG cold power and trigeneration systemwill be a good choice for the island’s energy supplies.This paper discusses the application of LNG cold energy systems, by the comparison ofpower generation, and takes the LNG cold energy to power generation by Rankine method.We found that the exergy efficiency of this system can reach to43%by exergy analysis way.Also according to the present situation of and problems existing in CCHP (combined CoolingHeating and Power, CCHP) system as well as their advantages and disadvantages and existingproblems of the present situation of the research. We choose gas turbine and condensingsteam turbine to powder generation, using condensing steam turbine for absorption typerefrigerating, taking ice storage to keep the cold energy, adopting heat pump for heating. Andthen we design a integrated CCHP system, which energy efficiency up to88.1%. At last, wecombine the power generation by LNG and CCHP to a LNG-CCHP system suited for theisland.According to the actual situation of some island, combining with the design ofLNG-CCHP joint process, complete engineering design for the island system, according to itsenergy consumption demand, determine the island of LNG process flow of the CCHP system,optimize the key equipment selection, the energy consumption of the whole process systemare analyzed, elasticity of operation, economic benefits and development potential.Calculation results are as follows: system in steam load32567tons, the cooling load is3.09million kW h, concentrated in heating capacity is2.73million kW h, the central heatingwater scale of1000people. Powder generated by LNG cold energy is34kW,Gas turbine witha capacity of3000kW,and condensing steam turbine generating with a capacity of1500kW. Evaporation of0.94t/h of LNG cold hot electrical installations, systems with a totalinvestment of about38.35million Yuan, the joint supply system in the total profit of20.49million Yuan, ensure the normal order of the island, under the premise of stable energy supplyhas good economic benefit and large elasticity of operation, the island has certain guidingsignificance on the construction of power system.