Supercritical mixed working medium steam turbine exhaust gas separation system and pumping method

Abstract

The invention discloses a supercritical mixed working medium steam turbine exhaust gas separation system. The pumping system is connected with a steam turbine and comprises a condenser, at least one centrifugal compressor, a driving device, a separation device and a storage tank, wherein the condenser is connected with an outlet of the steam turbine; the condenser conducts primary separation on mixed gas discharged by the steam turbine; a gas outlet of the condenser is connected with an inlet of the centrifugal compressor; the driving device is used for driving the centrifugal compressor to operate; an outlet of the centrifugal compressor is connected with the separation device; the separation device is used for conducting secondary separation on the mixed gas; a gas outlet of the separation device is connected with the storage tank. The system conducts effective separation on the mixed gas in exhaust gas of the supercritical mixed working medium steam turbine. The system is high in efficiency, large in pumping flow and high in supercharging ratio. The problems existing in pumping, recovery, storage and utilization of noncondensable gases such as high-flow carbon dioxide in the exhaust gas of the supercritical mixed working medium steam turbine are solved effectively. Pollution of the carbon dioxide to the environment is avoided.

Description

【Technical field】 [0001] The invention relates to the field of power generation equipment, in particular to a suction system and a suction separation method for separating the exhaust gas of a mixed working medium steam turbine. 【Background technique】 [0002] my country's coal-based energy structure will not change in the short term. The traditional coal-fired power generation technology burns coal in the air to release heat, converts the chemical energy in the coal into thermal energy to heat the feed water, and generates water vapor to drive the steam turbine to generate power. . The conventional coal gasification technology utilizes the partial oxidation-gasification reaction of coal in the air to produce syngas. In the above two types of processes, the loss of coal energy quality is large, and a large amount of pollution products such as SOx, NOx and solid particles are produced at the same time, which aggravates the degree of air pollution and the cost of emission redu...

AI Technical Summary

Problems solved by technology

However, the content of carbon dioxide in the exhaust gas of a supercritical mixed working medium steam turbine can reach 8%-10% of the total gas composition, which is much higher than the content of non-condensable gas in the exhaust gas of a conventional condenser unit steam turbine. Storage requirements after separation, the non-condensable gas needs to achieve a higher pressure boost ratio during the suction process, and the conventional suction system is difficult to meet the requirements

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