Organic Rankin cycle and heat pump cycle coupling system

Abstract

The invention relates to an organic Rankin cycle and heat pump cycle coupling system. The organic Rankin cycle and heat pump cycle coupling system comprises an organic Rankin cycle unit and a heat pump cycle unit, which are coupled. The organic Rankin cycle unit and the heat pump cycle unit share the same evaporator and are coupled by the same. During operation, cycle working medium and recovered low-temperature waste heat exchanges heat in the evaporator and are divided into two parts of gaseous working medium, one part enters an expansion machine to be involved in organic Rankin cycle, and the other part enters a compressor to be involved in heat pump cycle. The power of the expansion machine superiorly drives the compressor coaxially connected with the expansion machine, output of high-temperature heat energy of the heat pump cycle is realized, the rest power drives a generator to generate power and heat and power are supplied at the same time. Compared with the prior art, the organic Rankin cycle and heat pump cycle coupling system is energy saving and environment friendly, low-grade waste heat can be effectively recycled and utilized at high temperature, consumption of electric energy or fossil energy is reduced, heat and power can be supplied together, and greenhouse effect and air pollution are reduced.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery, and relates to a coupling system of an organic Rankine cycle and a heat pump cycle. Background technique [0002] At present, with the increasingly prominent energy and environmental issues, low-grade industrial waste heat, waste heat and renewable heat have gradually attracted people's attention because of their huge amount. In human production and life, such as chemical industry, printing and dyeing, textile, papermaking, fiber, ceramic processing and other production processes, there are a large number of heating production processes that do not require high thermal energy grades. Water, not being reused. These production processes are generally heated by traditional means such as fossil fuel combustion or electric heating at the cost of consuming high-grade energy, which not only reduces the grade of energy utilization, but also causes a lot of waste of waste heat resources, caus...

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Problems solved by technology

The technical solution disclosed in the above patent is mainly to generate electricity by consuming electricity. The heat pump system can realize 1:4 electricity-to-heat conversion, and then convert heat into electricity through the Rankine cycle, but the conversion efficiency of the Rankine cycle is low. Generally, it is below 0.2. Therefore, the economical efficiency of this technical solution is not good, and the power consumption is weakened. Secondly, the condensation temperature of the air source heat pump system is not high, resulting in the low temperature of the Rankine cycle and the low efficiency of the Rankine cycle, which leads to the overall The efficiency of the system is low, the energy and economic value need to be further improved, and the applicability is low

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