MSW processing vessel

Abstract

The present invention is an apparatus and a process for treating municipal solid waste (MSW). The apparatus includes a reaction vessel with helically arranged internal flights, a self-aligning door closure, and a swing-away door assembly. It also includes a novel structure for shredding MSW attached to the edges of the flights. This structure is number of projecting tooth like points.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention generally relates to reprocessing municipal solid waste (MSW), and more particularly relates to reaction vessels for treating MSW in a heated and pressurized process. [0003] 2. Background Information [0004] Handling solid waste is an increasingly difficult problem in the industrialized nations. Sixty-one percent of the United States' solid waste is dependent on disposal in landfills. However, nationwide the number of solid waste landfills is falling as the landfills fill to capacity and close, while new landfills cannot be opened due to regulations. The national average for solid waste disposal fees has increased by about 400 percent since 1985. Such fees, called tipping fees, can be expected to raise an average of seven percent per year. In addition, the number of solid waste transfer stations has increased due to the closure of many landfills and the permitting of larger solid waste landfills...

AI Technical Summary

Benefits of technology

[0020] The auger vanes can be constructed to be one continuous spiral from one end to the other of the reaction vessel. The auger vanes can also be broken into a series of arching vanes, with each section welded or otherwise attached to the interior wall of the reaction vessel and contributing to the auger effect during rotation of the vessel.

[0025] The MSW treatment vessel includes a swing away door assembly, which is adjacent the access opening. The door assembly includes a swing away door, which covers the access opening, and a davit assembly for supporting the swing away door. The davit assembly includes a generally vertical davit upright, which supports the door through a generally horizontal door support arm. The support arm has a first end and a second end with a counterweight attached to the first end and the access opening door attached to the second end. The davit assembly is configured to rotate around the davit upright so the access opening door may be rotated away from or toward the access opening. This can be accomplished by manual rotation of the davit assembly or it can easily be automated.

[0026] The MSW treatment vessel further includes one or more chain sections that are attached to the interior of the vessel. These are attached in various lengths, but typically two to six feet is sufficient to accomplish the purpose, while three to four feet has also proven effective. The chains would be sized according to the size and capacity of the reaction vessel, but a thickness of ¾ inches has proven successful for one preferred embodiment. The chains are attached so that they hang freely in the MSW treatment vessel. A chain detachably attached to the auger vane about every six feet is a preferred configuration. When the vessel rotates, the chains assist in agitating, pulverizing, and mixing the MSW contained within the vessel.

Problems solved by technology

Handling solid waste is an increasingly difficult problem in the industrialized nations.

However, nationwide the number of solid waste landfills is falling as the landfills fill to capacity and close, while new landfills cannot be opened due to regulations.

This presents a problem because high-pressure steam vessels require significant licensing and inspection regimes, and must be built to withstand the excessive pressure.

Images