Design and implementation of a multi energy complementary system for pig farms based on “dual carbon goals”

A large part of the world’s greenhouse gases comes from livestock and poultry breeding and manure. A survey report by the Food and Agriculture Organization of the United Nations（FAO） pointed out that animal husbandry is the industry that contributes the most to the greenhouse effect among all industries. Against the backdrop of the current goal of achieving“carbon peak and carbon neutrality”，in order to address the energy waste and environmental pollution caused by large-scale pig farms，building a multi energy complementary system for pig farms with clean energy as the main focus is of great significance in energy conservation，emission reduction，and improving energy efficiency. Inthelight of multi-energy complementation and energy cascade utilization，a multi-energy complementary system in pig farm has been constructed based on the pig farm’s own conditions that the pig farm has abundant biomass energy and solar energy，and it also has large daily electricity consumption and high heat load in winter. Based on the scale overview and load demand of the pig farm， appropriate supporting equipment was selected，the simulation calculation of photovoltaic power generation was conducted using PVsyst software. Taking into account the investment cost，equipment operation and maintenance cost，electric heating load demand，and seasonal demand of the system. Taking into account the system investment cost，equipment operation and maintenance cost，electric heating load demand，and seasonal demand，the final calculation showed that the pig farm can still earn 1.5857 million yuan based on the industry benchmark return rate of 8%，and the dynamic investment recovery period is approximately 7.3 years. Compared with traditional pig farms purchasing electricity from the grid，it can reduce carbon dioxide emissions by 204. 29 tons per year，indicating that the system can bring good economic benefits to pig farms and has significant energy-saving，emission reduction，and green environmental protection advantages. It can provide new business ideas for other farms such as chicken farms and cattle farms.