Low-grade waste heat utilization and smoke CO2 capturing utilization method and system in natural gas distributed energy resource

Abstract

The invention relates to a low-grade waste heat utilization and smoke CO2 capturing utilization method and system in natural gas distributed energy resource. Currently, waste heat utilization is generally in a high-temperature waste heat utilization stage, and utilization of low-temperature low-grade waste heat is not applied to a distributed energy resource system. A gas turbine performs combustion and power generation, high-temperature smoke is generated and enters a waste heat boiler to heat boiler water, high-temperature steam is generated and enters a steam turbine generator unit to pusha steam turbine and a power generator to generate power, meanwhile steam extraction is performed on the steam turbine generator unit so as to supply steam to a demanding user, the high-temperature smoke generated by the gas turbine forms low-temperature smoke through the waste heat boiler, a heat pump unit recycles heat in the low-temperature smoke so as to supply heat, the smoke temperature is further lowered, cooled smoke enters a CO2 capturing device for CO2 capturing, and captured CO2 is used for displacement of reservoir oil of an oil field . By means of the method and the system, low-grade waste heat utilization of the distributed energy resource can be improved, and meanwhile energy consumption in a CO2 capturing utilization process is reduced.

Description

technical field [0001] The invention relates to the utilization of low-grade waste heat and CO in flue gas in natural gas distributed energy 2 The method and system for capture and utilization belong to the field of distributed energy application technology. Background technique [0002] In some industrial parks, there are industries with large demand for steam, such as oilfield mining industry and biopharmaceuticals, and there is a large amount of CO produced by oilfield flooding. 2 need. The natural gas distributed energy station can not only meet the steam load demand, but also contains a large amount of high concentration of CO in the flue gas 2 , which captures the CO 2 It has good economy and can also reduce the CO of distributed energy stations 2 emission. The exhaust gas temperature of the natural gas distributed energy system is between 90°C and 120°C, and the CO 2 In the capture device, the flue gas needs to be cooled first, and then the CO 2 Absorption and ...

AI Technical Summary

Problems solved by technology

At present, in the world's advanced natural gas distributed energy, the utilization of waste heat is also in the stage of high-temperature waste heat utilization, and the utilization of low-temperature and low-grade waste heat has not been applied in distributed energy systems due to its economical reasons.

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