Multi-nozzle multi-stage oxygen supplying entrained-flow gasifier and gasification method thereof
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A gasifier and oxygen flow technology, which is applied to the multi-nozzle graded oxygen flow bed gasifier and its gasification field, can solve the problems of unreasonable temperature distribution and short life of the refractory lining in local areas of the wall, and achieve good process and Engineering effect, life extension, effect of high gas content
Active Publication Date: 2012-05-16
EAST CHINA UNIV OF SCI & TECH
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[0006] The technical problem to be solved by the present invention is to overcome the defects of the unreasonable temperature distribution in the prior art entrained bed gasification furnace, which causes the short service life of the refractory lining in the local area of the wall surface, and provide a multi-stage gasification furnace that adds oxidant to the gasification furnace. Nozzle staging for oxygen fluidized bed gasifier, and its gasification method
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Embodiment 1
[0064] This example illustrates the results obtained from the gasification test using the multi-nozzle staged oxygen fluidized bed gasifier of the present invention.
[0065] A coal-water slurry gasifier with a daily processing capacity of 3,000 tons of coal has a gasification pressure of 6.5MPa, a refractory brick wall, 4 process nozzles, and 4 secondary oxygen supply nozzles. Among them, the key dimensions in the gasifier are shown in Table 1 below:
[0066] Table 1. Key dimensions in the gasifier
[0067]
[0068] Wherein, the oxidizing agent is pure oxygen, and the amount of oxidizing agent for secondary oxygen supply accounts for 5%. The liquid slag discharge temperature is 1350°C, the coal slurry concentration is 65%, and the coal quality analysis data are shown in Table 2 to Table 5 below:
[0069] Table 2. Industrial Analysis Table
[0070] parameters
value
Air-dry basis moisture Mar
2.5% (wt)
Dry Basis Fixed Carbon Mar
57.88% (...
Embodiment 2
[0078] This example illustrates the results obtained from the gasification test using the multi-nozzle staged oxygen fluidized bed gasifier of the present invention.
[0079] A pulverized coal gasifier with a daily processing capacity of 3,000 tons of coal has a gasification pressure of 4.0 MPa, a water-cooled wall structure, 4 process nozzles, and 4 secondary oxygen supply nozzles. Among them, the key dimensions in the gasifier are shown in Table 6 below:
[0080] Table 6. Key dimensions in the gasifier
[0081]
[0082]
[0083] Among them, the gasification agent is pure oxygen, and the amount of oxidant for secondary oxygen supply accounts for 7%. The coal used is coal with high ash melting point (additional limestone fluxing agent), and the liquid slag discharge temperature is 1450°C. The coal quality analysis data are shown in Table 7 ~ as shown in Table 10:
[0084] Table 7. Industrial Analysis Table
[0085] parameters
value
Air-dry basis mo...
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Abstract
The present invention discloses a multi-nozzle multi-stage oxygen supplying entrained-flow gasifier. The entrained-flow gasifier comprises a top closed type gasifier body, an ignition nozzle chamber, a gasifier outlet, and at least two process nozzle chambers, wherein process nozzles are arranged inside the process nozzle chambers. The entrained-flow gasifier further comprises at least two secondary oxygen supplying nozzle chambers, wherein secondary oxygen supplying nozzles are arranged inside the secondary oxygen supplying nozzle chambers, the secondary oxygen supplying nozzle chambers are arranged between the process nozzle chambers and the gasifier outlet, and are symmetrically arranged on the circumference of the gasifier body, and the secondary oxygen supplying nozzles are arranged inside the secondary oxygen supplying nozzle chambers. The present invention further discloses a gasification method of the gasifier. According to the gasification method, an oxidizing agent is introduced to the secondary oxygen supplying nozzle during the reaction process to promote the further gasification reaction. With the present invention, a plurality of the nozzles are adopted to carry out multi-stage oxygen supplying on the gasifier, such that the service life of the fire brick structure on the upper space of the gasifier is substantially prolonged so as to substantially improve the operating rate and the performance of the gasifier. In addition, with the present invention, the liquid slag tapping of the gasifier is ensured, and the phenomenon of slag blocking of the outlet is avoided.
Description
technical field [0001] The invention relates to a device and a gasification method for gasifying carbonaceous substances to produce crude coal gas, in particular to a multi-nozzle staged oxygen gasification fluidized bed gasification furnace and a gasification method thereof. Background technique [0002] The gasification process is a thermochemical processing of coal. It uses coal or coal char as raw material, uses oxygen (air, oxygen-enriched or industrial pure oxygen), and water vapor as gasification agent, and converts the combustible part of coal or coal char into flammable gas through chemical reaction under high temperature and pressure. Gas process. The combustible gas obtained during gasification becomes coal gas, and the coal gas used as chemical raw materials is generally called syngas (in addition to coal as raw material, syngas can also use natural gas, heavy petroleum components, etc.) for gasification The equipment is called gasifier or gasifier. [0003] A...
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