A system for combined cooling and heating using waste heat of marine diesel engines and a method for using the same

Abstract

The invention discloses a combined cooling and heating system utilizing the waste heat of a marine diesel engine, which includes a radiator, a heat exchanger I, a heat exchanger II, a lithium bromide refrigeration unit, a condenser, and a first Hot water storage tank and second hot water storage tank; heat exchanger Ⅰ is used for heat exchange between tap water and jacket water, and heat exchanger Ⅰ is connected to the second hot water storage tank; heat exchanger Ⅱ is used for tap water and high-temperature smoke The heat exchange of gas; the lithium bromide refrigeration unit is used to use high-temperature water vapor as a heat source for refrigeration; the condenser is connected to the heat exchanger II and the first hot water storage tank respectively; the first hot water storage tank and the second hot water storage tank The hot water in the pipes first join together, and then respectively connected to the radiator, or directly used for domestic hot water. The present invention provides the usage method of the above system by opening and closing the throttle valve of the pipeline, strengthens the refrigeration or heating function according to the environment of the ship, and also provides domestic hot water for the crew, no pollution discharge, high utilization rate of waste heat and waste heat, and saves costs .

Description

technical field [0001] The invention belongs to the field of recovery and utilization of waste heat and waste heat of internal combustion engines, in particular to a system for combined cold and heat supply using waste heat of marine diesel engines and a method for using the same. Background technique [0002] At present, more than 80% of the world's trade is carried out by ships, most of which are driven by diesel engines. According to statistics, large civilian ships with a load of more than 100 tons in the world consume 500-1000 million tons of petroleum fuel every year. However, the thermal efficiency of marine diesel engines is only 40-50%, and a large proportion of energy is lost in the form of cooling water and flue gas. At present, the waste heat utilization technology of large diesel engines is still in the exploratory stage. If an efficient waste heat recovery process and system can be developed to make full use of the heat in the exhaust gas and coolant, the over...

AI Technical Summary

Problems solved by technology

Liang Youcai conducted research on waste heat recovery of Rankine organic cycle for large-scale two-stroke marine diesel engines with the main purpose of power generation, and carried out thermodynamic performance analysis. [D], Tianjin, Tianjin University, 2014), but the efficiency of the waste heat recovery system is not high, and the operation of the power generation system is complicated and the cost is high

[0003] In the prior art, in the invention patent "A Comprehensive Recovery System for Engine Waste Heat" with the application number of 2016108807268, the heat of automobile exhaust and coolant is used for cooling, heating and power generation, which improves the thermal efficiency of the system; however, due to the space of the automobile body Due to the weight limitation of the system, the system cannot use high-efficiency heat exchangers and pipeline control systems, nor can it produce domestic hot water that can be directly used by people. The recovery rate of waste heat from exhaust gas and coolant is not high, which greatly limits its use. for range

The patent application number is 2015210910959 "a heat and electricity integrated energy supply system". The high-temperature water and part of the high-temperature flue gas generated by the gas-fired generator set are used for heat exchange, and the cold and warm water after the heat exchange is used as domestic hot water. However, this system cannot fully utilize the waste heat of the high-temperature flue gas and high-temperature water, and can only generate domestic heat. The use of water, the waste heat utilization method of combined cooling and heating has not been realized, and the waste heat backwater utilization method is single

Images