Two stage material cooler
US4624636A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1984 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Apr 5, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D2015/026
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A two stage material cooling apparatus for cooling hot particulate material such as cement clinker discharged from a furnace such as the rotary kiln. The first stage includes a direct heat exchanger such as a reciprocating grate type heat exchanger or an attached tube cooler and serves primarily as a heat recuperator. This cooler acts on the principle of direct heat exchange between cooling gas and the hot material whereby the material is cooled and the gas is heated and returned to the kiln as preheated secondary air for combustion. The second stage cooler is a shaft type cooler with gas permeable sides so that cooling gas passes through the material generally perpendicular to the flow of material. The gas which is supplied to the second cooler can come from recirculated cooling gas or from ambient. The gas discharged from the second cooler can be supplied directly to the gas inlet of the first cooler recirculated to its inlet after passing through an air to air heat exchanger. In a preferred embodiment, the second cooler includes an arrangement whereby some of the cooling gas is supplied for passage through the material in the second cooler perpendicular to the flow of material a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.