Cascade Utilization System of Waste Heat from Combined Biogas Cogeneration in Rural Areas

Abstract

The invention relates to a joint biogas combined heat and power generation waste heat gradient utilization system for rural areas. A straw pre-treatment tank, a stirring tank, a fermenting tank, a solid-liquid separation tank, a first biogas residue storage tank, a second biogas residue storage tank, a water supplementing tank, a gas storage tank, a biogas generating set, a lithium bromide absorption refrigerator, a first heat exchanger, a second heat exchanger, a constant-temperature water storage tank and a hot water storage tank are connected, so that biogas circulation and biogas residue circulation are integrated, and subsequently, degradation and utilization rates of a fermentation substrate are enhanced and the temperature of a fermentation system is guaranteed; in addition, waste heat (including cooling water and flue gas) from biogas power generation is applied to heating and cooling, and flue gas type and hot water type waste heat utilization modes are combined so as to meet demands of household energy consumption such as electricity utilization, heating, cooling and the like in the rural areas, so that deep and efficient utilization of the waste heat from the biogas power generation is achieved and gradient utilization of energy is realized; therefore, energy utilization rate and economic benefit of an entire biogas power generation system are improved; and the system has good popularizing and practical values.

Description

technical field [0001] The invention relates to the technical field of biogas fermentation and utilization, in particular to a cascaded utilization system for waste heat of rural household biogas cogeneration. Background technique [0002] Energy is the material basis of human activities, and the development of human society is inseparable from the emergence of high-quality energy and the use of advanced energy technologies. Today, the development of energy is a common concern of the whole world and all mankind, and it is also the key to the social and economic development of our country. As a renewable energy, biogas has been paid more and more attention and widely used. Biogas power generation is a biogas utilization technology that has emerged with the construction of large-scale biogas projects and the continuous development of biogas comprehensive utilization technology. At present, there are generally problems such as poor operation stability, low economic benefits, a...

AI Technical Summary

Problems solved by technology

At present, there are generally problems such as poor operation stability, low economic benefits, and low utilization rate of waste heat in large and medium-sized biogas power generation projects in my country, which restrict the popularization and application of biogas cogeneration technology.

Images