Method for preparing biodiesel from alage cultured by exhaust gas and ash of power plant as well as system

Abstract

The invention discloses a method for preparing biodiesel from alage cultured by exhaust gas and ash of a power plant as well as a system. The method comprises steps as follows: ash produced through boiler combustion of the power plant and boiler circulating water are taken as main components of an alga culture solution for preparation of the alga culture solution; the alga culture solution is conveyed into an alga culture container, flue gas discharged by a power plant boiler is shunted, CO2 obtained through shunting is fed into the alga culture container, and culture conditions required by alga culture are provided; macroalgae in maturely cultured alga groups are ground and cut and then are stirred and mixed with microalgae in the maturely cultured alga groups, and alga slurry is formed; the alga slurry is conveyed to a high pressure reaction kettle, fourth-stage extraction steam of a power plant turbine is introduced into the high pressure reaction kettle until the high pressure reaction kettle is in a super-critical state, accordingly, the alage have a hydrothermal liquidization reaction, and the biodiesel is produced. According to the method and the system, various resources of the power plant are sufficiently utilized and efficiently converted into available resources, the alga culture and biodiesel oil preparation costs are reduced, and the energy utilization efficiency is improved.

Description

technical field [0001] The invention belongs to the technology of energy utilization, and relates to algae cultivation and biodiesel preparation technology, in particular to a method for cultivating algae to prepare biodiesel by utilizing smoke exhaust and ash from a power plant, and also relates to a system using the method. Background technique [0002] my country's coal production and consumption account for a large proportion in the world. Among the various forms of power generation in China, coal-fired power generation still occupies a dominant position. However, coal-fired power generation has the following problems: [0003] (1) During the combustion of coal, CO will be produced, including 2 The flue gas with other components has exacerbated the negative impact on the environment such as the greenhouse effect. Therefore, the treatment of flue gas and CO 2 The collection and utilization of has received extensive attention from the industry. [0004] (2) The coal co...

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Problems solved by technology

[0004] (2) The coal consumption of the power plant is huge, if the ash produced by combustion cannot be fully utilized as a resource, it will not only waste resources, but also cause pollution to the environment

[0006] The existing methods for utilizing the flue gas and ash discharged from power plants are either only utilizing the flue gas or only utilizing the ash. Not only is the energy utilization efficiency not high, but the equipment involved is complex in structure and high in cost. Not suitable for widespread promotion and application

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