Power system of bicirculating two-level screw expander

Abstract

The invention relates to a power system of a bicirculating two-level screw expander, comprising an evaporator and a condenser, a working medium circulating passage formed between the evaporator and the condenser, a heating passage formed by the evaporator and a heat source inlet as well as a heat source outlet, and a cooling passage formed by the condenser and a cooling water inlet as well as a cooling water outlet, wherein a power device of the two-level screw expander is arranged on the working medium circulating passage between the working medium outflow side of the evaporator and the working medium inflow side of the condenser. The power system accords with energy conservation and environmental protection requirements, an organic working medium with a low boiling point adopted by the working medium circulating passage plays a role of a medium in a closed loop, and no consumption exists under a good sealing condition; the requirement on residual heat parameters is low, and no direct contact exists in heat exchange between the circulating working medium with the low boiling point and heated fluids as well as cooling water; and after the two-level screw expander is adopted, a system can obtain a greater expansion ratio, pressure drop and enthalpy drop are realized, and the heat efficiency of the system can reach 15 percent.

Description

technical field [0001] The invention relates to a power system of a double-cycle two-stage screw expander. In particular, it relates to a dual-circulation two-stage screw expander power system capable of fully recovering and utilizing industrial waste heat and generating power from geothermal heat. Background technique [0002] Due to the characteristics of my country's energy structure, energy has not been fully utilized in cascades, and industrial waste heat resources are large and widely distributed, mainly in the following aspects. [0003] (1) A large number of industrial kilns consume a lot of energy. For example, in the cement industry, due to the backward production technology, the average clinker energy consumption of the enterprise is more than twice that of the foreign advanced level. The temperature of the exhaust gas discharged from the kiln is about 300-400 ℃, and the waste heat recovery rate is only 2%, which is the best choice for power generation projects. ...

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Problems solved by technology

[0004] (2) There are about 500,000 industrial boilers in my country, of which a considerable part of the 6-10t / h boilers have a rated steam pressure of 1.3MPa. waste

At present, the single-cycle single-stage screw machine system is generally used in China to recover waste heat, which has a small expansion ratio, small pressure drop, low efficiency, and high requirements for heat sources.

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