Effective energy exploitation from horse manure combustion.

The research article presents a detailed study on how to extract energy from horse manure through combustion. The paper explores the potential impact of the origin and management of waste on this process, as well as strategies to overcome challenges related to the high moisture content found in manure.

Overview of Investigation and Findings

• The first part of the study examined the possible impact of horse manure origins and how it is managed, specifically the conditions during storage. Measurements during this phase included elemental analysis, moisture content, heating value and ash melting temperature. The findings showed minimal carbon loss with time but the origin and management of horse manure did not pose challenges to its profitable energy extraction through combustion.
• Ignition tests were performed to challenge the industrial belief that combustion of manure without the aid of auxiliary fuel such as wood shavings is tough. The results disproved this widely held opinion.
• The major hindrance to manure combustion was found to be its high moisture content, with an approximate weight balance of 60%. The researchers focused on effectively removing this moisture. This task required a clear understanding of manure permeability, influenced by the bedding material used and overall stable management.

Focusing on Moisture Removal

• The research explored the effect of manure composition and its sample size on moisture removal efficiency. The energy impact of moisture removal needs to be minimized as much as possible for effective energy recovery.
• An energy balance confirmed that the total removal of moisture in the manure, accounting for approximately 62% of the weight balance, results in a reduction of the manure’s potential energy content by approximately 23%. However, this “drying penalty” on energy is substantially compensated by the much improved reactivity of the remaining solid fuel.

Conclusions from the Research

The research demonstrates the feasibility of energy recovery from horse manure through combustion. It further disproves the industrial belief that manure combustion without supplemental fuel is difficult and identifies high moisture content as a critical challenge in the combustion process. This discovery points to the need for effective moisture removal strategies. The research also defines a clear link between the drying process and improvements in the reactive quality of the resultant solid fuel.