Gasification of carbonaceous material

Abstract

The present invention relates to GASIFICATION OF a CARBONACEOUS MATERIAL, and discloses a grate assembly 10 for a gasifier for gasifying carbonaceous material producing ash includes an upper rotatable grate component 11 and a lower rotatable support structure 12 fastened to the upper rotatable grate component by a plurality of removable fasteners 15 acting to prevent vertical displacement of the upper rotatable grate component and the lower rotatable support structure. The lower rotatable support structure is configured to be drivingly rotated about a common vertical axis of rotation 21 shared with the upper rotatable grate component. The assembly 10 further includes at least two key torque transmitters 16 spaced angularly relative to the common axis of rotation and engaging the upper rotatable grate component and the lower rotatable support structure to transfer torque from the lower rotatable support structure to the upper rotatable grate component when the lower rotatable support structure is driven.

Description

technical field [0001] The present invention relates to the gasification of carbonaceous materials. In particular, the present invention relates to a grid assembly of a gasifier for gasifying carbonaceous materials and to a gasifier for gasifying carbonaceous materials. Background technique [0002] For some gasifiers such as FBDB TM Gasifiers, etc., require intermittent or continuous loading and unloading of particulate materials, such as particulate carbonaceous materials (eg, coal), ash, and the like. Thus, for example, in the case of a pressurized gasifier (eg, a fixed bed dry bottom gasifier), particulate carbonaceous feedstock, such as coal, is loaded into the gasification chamber of the gasifier to form a bed (in the case of a fixed bed gasifier), and gasification is carried out at high temperature and pressure, after gasification, any remaining ungasified material passes through the rotatable grill assembly and ash lock as ash ) is removed from the gasifier. ...

AI Technical Summary

Problems solved by technology

[0012] WO 2006 / 061738 attempts to overcome the problems of agglomeration of the particulate coal feedstock fed to a fixed bed coal gasifier, which leads to unstable operation of the gasifier, and heterogeneous coal formation due to preferential gas flow through the aforementioned Problems with "hot spots" caused by beds

Nowhere in WO 2006 / 061738 is there any mention of the problems of misalignment between the upper and lower grid members, relative rotation of the upper and lower grid members about the keyed torque transfer device, or Grille assembly malfunction due to shearing of connecting bolts between upper and lower grille members

CN 201762288 identifies a number of problems associated with prior art grates including, inter alia: (i) ash buildup on the grate resulting in inefficiency in the gasifier, (ii) ash clogging the grate holes, thereby preventing combustible gases from leaving the furnace body through the holes, thereby inhibiting gas production, (iii) the holes in the grate lead to material leakage, and (iv) because the holes in different types of grates are different in size to suit different The gasification of various types of biomass, so the existing grid is not suitable for the gasification of various types of biomass

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